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SDLRC - Scientific Articles all years by Author - H-Hd


The Sheahan Diamond Literature Reference Compilation
The Sheahan Diamond Literature Reference Compilation is compiled by Patricia Sheahan who publishes on a monthly basis a list of new scientific articles related to diamonds as well as media coverage and corporate announcementscalled the Sheahan Diamond Literature Service that is distributed as a free pdf to a list of followers. Pat has kindly agreed to allow her work to be made available as an online digital resource at Kaiser Research Online so that a broader community interested in diamonds and related geology can benefit. The references are for personal use information purposes only; when available a link is provided to an online location where the full article can be accessed or purchased directly. Reproduction of this compilation in part or in whole without permission from the Sheahan Diamond Literature Service is strictly prohibited. Return to Diamond Resource Center
Sheahan Diamond Literature Reference Compilation - Scientific Articles by Author for all years
A-An Ao+ B-Bd Be-Bk Bl-Bq Br+ C-Cg Ch-Ck Cl+ D-Dd De-Dn Do+ E F-Fn Fo+ G-Gh Gi-Gq Gr+ H-Hd He-Hn Ho+ I J K-Kg Kh-Kn Ko-Kq Kr+ L-Lh
Li+ M-Maq Mar-Mc Md-Mn Mo+ N O P-Pd Pe-Pn Po+ Q R-Rh Ri-Rn Ro+ S-Sd Se-Sh Si-Sm Sn-Ss St+ T-Th Ti+ U V W-Wg Wh+ X Y Z
Sheahan Diamond Literature Reference Compilation - Media/Corporate References by Name for all years
A B C D-Diam Diamonds Diamr+ E F G H I J K L M N O P Q R S T U V W X Y Z
Tips for Users
Posted/Published Reference CodesThe SDLRC provides 3 types of references identified in the reference code. DS for scientific article, DM for a media article, and DC for a corporate announcement. Consider DS0512-0001. The DS stands for "diamond scientific". 05 stands for 2005, the year the reference was posted. 12 represents the month the reference was posted. For all years prior to 2015 the default month is 12. -0001 is the reference's identifier and it does not mean anything. The number below the refence code, ie 2015, is the year the article was published. Note that the posted year may sometimes be later than the published year.
Sort OrderReferences are sorted by the "author" name and when the reference was posted to the compilation.
Most RecentIf the reference code is highlighted yellow, the reference was made available through the most recent monthly compilation of new literature. Use this to check out new references. When new references are posted, we make it our priority to track down an online link and obtain an abstract. With regard to older references, tracking down an abstract and an online link is a work in progress.
Link to external location of article: If the title has a link, it means we have found a location online where you can either retrieve the full article free, or purchase access to it. The Sheahan Diamond Literature Service is not a technical article procurement service; if you want a restricted article, you must deal directly with the vendor who controls the copyright to the article.
Searching this page for a specific term or authorIn your Firefox browser click Edit in the menu bar and then Find. In the Find box that shows up at the bottom of the web page enter your search term. Firefox will highlight all occurrences. This is particularly helpful when the author you are seeking was not the lead author by whom the compilation is sorted.
Sending or sharing a referenceThe left column (Posted/Published) has an embedded hyperlink for each reference. In Firefox, if you right click on it, you can obtain the link url for that reference's location within the page, which you can copy and paste into an email or any other document. You can also use the "share this link" option to tweet, facebook etc the link.
Author Index
A-An Ao+ B-Bd Be-Bk Bl-Bq Br+ C-Cg Ch-Ck Cl+ D-Dd De-Dn Do+ E F-Fn Fo+ G-Gh Gi-Gq Gr+ H-Hd He-Hn Ho+ I J K-Kg Kh-Kn Ko-Kq Kr+ L-Lh
Li+ M-Maq Mar-Mc Md-Mn Mo+ N O P-Pd Pe-Pn Po+ Q R-Rh Ri-Rn Ro+ S-Sd Se-Sh Si-Sm Sn-Ss St+ T-Th Ti+ U V W-Wg Wh+ X Y Z
Sheahan Diamond Literature Reference Compilation - Scientific Articles by Author for all years - H-Hd
Posted/
Published
AuthorTitleSourceRegionKeywords
DS201904-0752
2019
H.Kobayashi, M., Sumino, H., Burgess, R., Nakai, S., Iizuka, T., Nagao, J. Kagi, H., Nakamura, M., Takahashi, E., Kogiso, T., Ballentine, C.J.Halogen heterogeneity in the lithosphere and evolution of mantle halogen abundances inferred from intraplate mantle xenoliths. Kilbourne HoleGeochemistry, Geophysics, Geosystems, Vol. 20, 2, pp. 952-973.United States, New Mexicoxenoliths

Abstract: Elemental and isotopic compositions of volatile species such as halogens, noble gases, hydrogen, and carbon can be used to trace the evolution of these species in the Earth. Halogens are important tracers of subduction recycling of surface volatiles into the mantle: however, there is only limited understanding of halogens in the mantle. Here we provide new halogen data of mantle xenoliths from intraplate settings. The mantle xenoliths show a wide range of halogen elemental ratios, which are expected to be related to later processes after the xenoliths formed. A similar primary halogen component is present in the xenoliths sampled from different localities. This suggests that the mantle has the uniform halogen composition over a wide scale. The halogen composition in the convecting mantle is expected to have remained constant over more than 2 billion years, despite subduction of iodine?rich halogens. We used mass balance calculations to gain understanding into evolution rate of I/Cl ratio in the mantle. Calculations suggest that, in order to maintain the I/Cl ratio of the mantle over 2 Gyr, the I/Cl ratio of the subducted halogens must be no more than several times higher than the present?day mantle value.
DS202105-0768
2020
H.Jiang, S. Su, H., Xiong, Y., Liu, T., Zhu, K., Zhang, L.Spatial temporal distribution, geological characteristics and ore formation controlling factors of major types of rare metal mineral deposits in China.Acta Geologica Sinica, Vol. 94, 6, pp. 1757-1773.ChinaREE

Abstract: Rare metals including Lithium (Li), Beryllium (Be), Rubidium (Rb), Cesium (Cs), Zirconium (Zr), Hafnium (Hf), Niobium (Nb), Tantalum (Ta), Tungsten (W) and Tin (Sn) are important critical mineral resources. In China, rare metal mineral deposits are spatially distributed mainly in the Altay and Southern Great Xingán Range regions in the Central Asian orogenic belt; in the Middle Qilian, South Qinling and East Qinling mountains regions in the Qilian-Qinling-Dabie orogenic belt; in the Western Sichuan and Bailongshan-Dahongliutan regions in the Kunlun-Songpan-Garze orogenic belt, and in the Northeastern Jiangxi, Northwestern Jiangxi, and Southern Hunan regions in South China. Major ore?forming epochs include Indosinian (mostly 200-240 Ma, in particular in western China) and the Yanshanian (mostly 120-160 Ma, in particular in South China). In addition, Bayan Obo, Inner Mongolia, northeastern China, with a complex formation history, hosts the largest REE and Nb deposits in China. There are six major rare metal mineral deposit types in China: Highly fractionated granite; Pegmatite; Alkaline granite; Carbonatite and alkaline rock; Volcanic; and Hydrothermal types. Two further types, namely the Leptynite type and Breccia pipe type, have recently been discovered in China, and are represented by the Yushishan Nb-Ta- (Zr-Hf-REE) and the Weilasituo Li-Rb-Sn-W-Zn-Pb deposits. Several most important controlling factors for rare metal mineral deposits are discussed, including geochemical behaviors and sources of the rare metals, highly evolved magmatic fractionation, and structural controls such as the metamorphic core complex setting, with a revised conceptual model for the latter.
DS202205-0735
2022
H.B.Yu, X., Liu, F., Long, Z-Y.Li, H.B., Wang, H., Yu, X-Y.Color genesis of brown diamond from the Mengyin kimberlite, China.Crystals, March 23p.Chinadeposit - Mengyin

Abstract: The Mengyin diamondiferous kimberlite cluster in Shandong province is one of the three major sources of natural diamond in China, where many brown diamonds are mined, but the genesis of their color is still controversial. In this paper, studies including microscopic examination, optical properties of orthogonal polarization, low temperature photoluminescence spectra, infrared spectra, Raman spectra, ultraviolet-visible absorption spectra, luminescence of cathodoluminescence, and transmission electron microscopy have been carried out on the uncut brown diamonds and their slice samples to constrain on the color genesis of brown diamond from the Mengyin deposit. The results show that the brown color is dominantly caused by plastic deformation, and some samples are also caused by non-deformation-related defects and inclusions.
DS201906-1271
2019
H+Gazel, E.Barry, P.H., de Moor, J.M., Giovannelli, D., Schrenk, M., Hummer, D.R., Lopez, T., Pratt, C.A., Alpizar Segua, Y., Battaglia, A., Beaudry, A., Bini, G., Cascante, M., d'Errico, G., di Carlo, M., Fattorini, D., Fullerton, K., H+Gazel, E., Gonzalez, G., HalForearc carbon sink reduces long term volatile recycling into the mantle.Nature , 588, 7753, p. 487.Mantlecarbon

Abstract: Carbon and other volatiles in the form of gases, fluids or mineral phases are transported from Earth’s surface into the mantle at convergent margins, where the oceanic crust subducts beneath the continental crust. The efficiency of this transfer has profound implications for the nature and scale of geochemical heterogeneities in Earth’s deep mantle and shallow crustal reservoirs, as well as Earth’s oxidation state. However, the proportions of volatiles released from the forearc and backarc are not well constrained compared to fluxes from the volcanic arc front. Here we use helium and carbon isotope data from deeply sourced springs along two cross-arc transects to show that about 91 per cent of carbon released from the slab and mantle beneath the Costa Rican forearc is sequestered within the crust by calcite deposition. Around an additional three per cent is incorporated into the biomass through microbial chemolithoautotrophy, whereby microbes assimilate inorganic carbon into biomass. We estimate that between 1.2 × 108 and 1.3 × 1010 moles of carbon dioxide per year are released from the slab beneath the forearc, and thus up to about 19 per cent less carbon is being transferred into Earth’s deep mantle than previously estimated.
DS1980-0156
1980
Haack, E.M.Haack, E.M.Collecting Gems and Minerals in South AfricaLapidary Journal, Vol. 34, No. 9, PP. 1936-1940.South AfricaGuidebook
DS2003-0117
2003
Haack, H.Bizzaro, M., Baker, J.A., Haack, H., Ulfbeck, D., Rosing, M.Early history of Earth's crust mantle system inferred from hafnium isotopes inNature, No. 6926, Feb. 27, pp. 931-2.MantleGeochronology
DS1996-0577
1996
Haack, U.K.Haack, U.K., Zimmermann, H.D.Retrograde mineral reactions: a heat source in the continental crust?Geologische Rundschau, Vol. 85, pp. 130-137Mantle, crustHydrothermal systems, Water/ rock reaction, exothermic
DS1950-0065
1951
Haacke, C.H.Haacke, C.H.Geluk Het VlerkeUnknown., 186P.Southwest Africa, NamibiaKimberlite
DS1995-0886
1995
Haak, V.Jiracek, G.R., Haak, V., Olsen, K.H.Methods of investigation: practical magnetotellurics in a continental riftenvironmentContinental Rifts: evolution, structure, tectonics, No. 25, pp. 103-132GlobalGeophysics -magnetotellurics
DS1995-1526
1995
Haak, V.Prodehl, C., Mueller, St., Haak, V.The European Cenozoic rift systemContinental Rifts: evolution, structure, tectonics, No. 25, pp. 133-212.EuropeGeophysics -seismics, magnetics, gravity, Heat flow, structure
DS2003-1172
2003
Haak, V.Ritter, O., Weckmann, U., Victor, T., Haak, V.A magnetotelluric study of the Damara belt in Namibia: 1. regional scale conductivityPhysics of the Earth and Planetary Interiors, Vol. 138, 2, July 16, pp. 71-90.NamibiaGeophysics - magnetics
DS2003-1463
2003
Haak, V.Weckmann, U., Ritter, O., Haak, V.A magnetotelluric study of the Damara belt in Namibia: 2. MT phases over 90 revealPhysics of the Earth and Planetary Interiors, Vol. 138, 2, July 16, pp. 91-112.NamibiaGeophysics - magnetics
DS200412-1673
2003
Haak, V.Ritter, O., Weckmann, U., Victor, T., Haak, V.A magnetotelluric study of the Damara belt in Namibia: 1. regional scale conductivity anomalies.Physics of the Earth and Planetary Interiors, Vol. 138, 2, July 16, pp. 71-90.Africa, NamibiaGeophysics - magnetics
DS200412-2094
2003
Haak, V.Weckmann, U., Ritter, O., Haak, V.A magnetotelluric study of the Damara belt in Namibia: 2. MT phases over 90 reveal the internal structure of the Waterberg FaultPhysics of the Earth and Planetary Interiors, Vol. 138, 2, July 16, pp. 91-112.Africa, NamibiaGeophysics - magnetics
DS2000-0718
2000
Haapala, I.Nyamai, C.M., Haapala, I.A comparison of the uncompahgrite and turjaite mineralogy (phlogopite, melilite) south Nyanza DistrictJournal of African Earth Sciences, p. 68. abstract.KenyaMelilite, Mineralogy
DS2000-0719
2000
Haapala, I.Nyamai, C.M., Haapala, I.Petrochemistry of the melilite bearing uncompahgrite and turjaite rock types South Rangwe Complex, Kenya.Igc 30th. Brasil, Aug. abstract only 1p.Kenya, western KenyaMelilites
DS2002-1164
2002
Haapala, I.Nyamai, C.M., Haapala, I., Ngecu, W.M.A comparison of the uncompahgrite turjaite complex (phlogopite, melilite) of south Nayanza, western Kenya, with similar rock complexes in Asia, Australia, America11th. Quadrennial Iagod Symposium And Geocongress 2002 Held Windhoek, Abstract p. 37.KenyaMelilite
DS2001-0432
2001
Ha'aretzHa'aretzLeviev seeks cut of lucrative Russian rough diamond marketHaaretz, Sept. 24, 1p.RussiaNews item, Africa Israel
DS1992-0642
1992
Haas, J.R.Haas, J.R., Haskin, L.A., Luhr, J.F., Bowring, S.A., Rasskazov, S.Y.Petrogenesis of quaternary basinites from the Bartoy Volcanic Field of the Baikal Rift Zone, Siberia, RussiaEos Transactions, Vol. 73, No. 14, April 7, supplement abstracts p.334Russia, Siberia, RussiaBasinite, Baikal Rift Zone
DS1992-0643
1992
Haase, C.Haase, C.Creating a financially rewarding royaltyPda Digest, Vol. 6, No. 28, Summer p. 1, 3, 4GlobalEconomics, ore reserves, Royalties
DS1993-0608
1993
Haase, C.Haase, C.The art of creating a financially rewarding royalty: Part II. Net profitsroyaltiesProspectors and Developers Association of Canada (PDAC) Digest, Vol. 6, No. 30, Summer p. 2, 4, 5CanadaEconomics, Net Profits Royalty, NCR.
DS2003-0660
2003
Haase, K.John, T., Schenk, V., Haase, K., Scherer, E., Tembe, F.Evidence for a Neoproterozoic ocean in south central Africa from mid oceanic ridgeGeology, Vol. 31, 3, March pp. 243-6.ZambiaGondwana, suture zones, Rodinia, Geothermometry
DS2003-0661
2003
Haase, K.John, T., Schenk, V., Haase, K., Scherer, E., Tembo, F.Evidence for a Neoproterozoic ocean in south central Africa from mid ocean ridge typeGeology, Vol. 31, 3, March pp. 243-6.ZambiaEclogites, Geochemistry
DS200412-0919
2003
Haase, K.John, T., Schenk, V., Haase, K., Scherer, E., Tembo, F.Evidence for a Neoproterozoic ocean in south central Africa from mid ocean ridge type geochemical signatures and pressure temperGeology, Vol. 31, 3, March pp. 243-6.Africa, ZambiaEclogite, Geochemistry
DS200412-1939
2004
Haase, K.Stroncik, N.A., Haase, K.Chlorine in oceanic intraplate basalts: constraints on mantle sources and recycling processes.Geochimica et Cosmochimica Acta, 13th Goldschmidt Conference held Copenhagen Denmark, Vol. 68, 11 Supp. July, ABSTRACT p.A567.MantleMagmatic volatiles
DS1996-0578
1996
Haase, K.M.Haase, K.M.The relationship between the age of the lithosphere and the composition of oceanic magmas... melting...Earth and Planetary Science Letters, Vol. 144-1, 2, Oct pp. 75-92.GlobalMantle, Thermal structure
DS1997-0934
1997
Haase, K.M.Puchtel, I.S., Haase, K.M., Nemchin, A.A., et al.Petrology and geochemistry of kimberlite Pipe II of Chigicherla area, Anantapur District, Andhra Pradesh.Geochimica et Cosmochimica Acta, Vol. 61, No. 6, March 1, pp. 1205-Baltic shieldPetrology, Proterozoic mantle plume, Archean continent lithosphere, Tectonics, rifting, Mantle
DS200612-0745
2006
Haase, K.M.Krienitz, M.S., Haase, K.M., Mezger, K., Eckardt, V., Shaikh Mashail, M.A.Magma genesis and crustal contamination of continental intraplate lavas in northwestern Syria.Contributions to Mineralogy and Petrology, Vol. 151, 6, pp. 698-716.Africa, SyriaMagmatism - not specific to diamonds
DS200712-1049
2007
Haase, K.M.Stroncik, N.A., Niedermann, S., Haase, K.M.Neon and helium isotopes as tracers of mantle reservoirs and mantle dynamics.Earth and Planetary Science Letters, Vol. 256, 1-2, June 15, pp. 334-344.MantleGeochronology
DS201012-0788
2010
Haase, K.M.Timm, J., Layne, G.D., Haase, K.M., Barnes, J.D.Chlorine isotope evidence for crustal recycling into the Earth's mantle.Earth and Planetary Science Letters, Vol. 298, 1-2, Sept. 15, pp. 175-182.MantleSubduction
DS201112-0552
2011
Haase, K.M.Krienitz, M-S., Haase, K.M.The evolution of the Arabian lower crust and lithospheric mantle - geochemical constraints from southern Syrian mafic and ultramafic xenoliths.Chemical Geology, Vol. 280, 3-4, pp. 271-283.Asia, ArabiaSubduction
DS201509-0425
2015
Haberland, C.Ryberg, T., Haberland, C., Haberlau, T., Weber, M.H., Klaus, B., Behrmann, J.H., Jokat, W.Crustal structure of northwest Namibia: evidence for plume rift continent interaction.Geology, Vol. 43, 8,pp. 739-Africa, NamibiaPlume, rifting

Abstract: The causes for the formation of large igneous provinces and hotspot trails are still a matter of considerable dispute. Seismic tomography and other studies suggest that hot mantle material rising from the core-mantle boundary (CMB) might play a significant role in the formation of such hotspot trails. An important area to verify this concept is the South Atlantic region, with hotspot trails that spatially coincide with one of the largest low-velocity regions at the CMB, the African large low shear-wave velocity province. The Walvis Ridge started to form during the separation of the South American and African continents at ca. 130 Ma as a consequence of Gondwana breakup. Here, we present the first deep-seismic sounding images of the crustal structure from the landfall area of the Walvis Ridge at the Namibian coast to constrain processes of plume-lithosphere interaction and the formation of continental flood basalts (Paraná and Etendeka continental flood basalts) and associated intrusive rocks. Our study identified a narrow region (<100 km) of high-seismic-velocity anomalies in the middle and lower crust, which we interpret as a massive mafic intrusion into the northern Namibian continental crust. Seismic crustal reflection imaging shows a flat Moho as well as reflectors connecting the high-velocity body with shallow crustal structures that we speculate to mark potential feeder channels of the Etendeka continental flood basalt. We suggest that the observed massive but localized mafic intrusion into the lower crust results from similar-sized variations in the lithosphere (i.e., lithosphere thickness or preexisting structures).
DS201509-0425
2015
Haberlau, T.Ryberg, T., Haberland, C., Haberlau, T., Weber, M.H., Klaus, B., Behrmann, J.H., Jokat, W.Crustal structure of northwest Namibia: evidence for plume rift continent interaction.Geology, Vol. 43, 8,pp. 739-Africa, NamibiaPlume, rifting

Abstract: The causes for the formation of large igneous provinces and hotspot trails are still a matter of considerable dispute. Seismic tomography and other studies suggest that hot mantle material rising from the core-mantle boundary (CMB) might play a significant role in the formation of such hotspot trails. An important area to verify this concept is the South Atlantic region, with hotspot trails that spatially coincide with one of the largest low-velocity regions at the CMB, the African large low shear-wave velocity province. The Walvis Ridge started to form during the separation of the South American and African continents at ca. 130 Ma as a consequence of Gondwana breakup. Here, we present the first deep-seismic sounding images of the crustal structure from the landfall area of the Walvis Ridge at the Namibian coast to constrain processes of plume-lithosphere interaction and the formation of continental flood basalts (Paraná and Etendeka continental flood basalts) and associated intrusive rocks. Our study identified a narrow region (<100 km) of high-seismic-velocity anomalies in the middle and lower crust, which we interpret as a massive mafic intrusion into the northern Namibian continental crust. Seismic crustal reflection imaging shows a flat Moho as well as reflectors connecting the high-velocity body with shallow crustal structures that we speculate to mark potential feeder channels of the Etendeka continental flood basalt. We suggest that the observed massive but localized mafic intrusion into the lower crust results from similar-sized variations in the lithosphere (i.e., lithosphere thickness or preexisting structures).
DS2002-0626
2002
Habermann, D.Habermann, D.Quantitative cathodluminesence ( CL) spectroscopy of minerals: possibilities and limitations.Mineralogy and Petrology, Vol. 76, No. 3-4, pp. 247-60.GlobalTechniques - not specific to diamonds
DS1860-0508
1886
Habersham, W.W.Habersham, W.W.Diamonds in DixieDixie., Vol. 2, PP. 7-8.United States, GeorgiaDiamond Occurrence
DS1981-0280
1981
Habgood, F.Mallick, D.I.J., Habgood, F., Skinner, A.C.A Geological Interpretation of Land sat Imagery and Air Photography of Botswana.Overseas Geol. Min. Resour., No. 56, 39P.BotswanaTectonic, Structure, Kimberlite, Remote Sensing, Tectonics
DS1998-0551
1998
HabibHabib, ShanifThe petrology and geochemistry of Proterozoic ultrapotassic diamond bearing lamprophyre dikes...University of Western Ontario, Msc. thesisNorthwest TerritoriesDikes - Gibson-MacQuoid Lake belt
DS202102-0239
2021
Habler, G.Zeug, M., Nasdala. L., Ende, M., Habler, G., Hauzenberger, C., Chanmuang, C., Skoda, R., Topa, D., Wildner, M., Wirth, R.The parisite - (Ce) enigma: challenges in the identification of fluorcarbonate minerals ( Bastanite)Mineralogy and Petrology, Vol. 115, 19p. Doi.org/101007 /s00710-020- 00723-x pdfSouth America, ColombiaREE

Abstract: A multi-methodological study was conducted in order to provide further insight into the structural and compositional complexity of rare earth element (REE) fluorcarbonates, with particular attention to their correct assignment to a mineral species. Polycrystals from La Pita Mine, Municipality de Maripí, Boyacá Department, Colombia, show syntaxic intergrowth of parisite-(Ce) with röntgenite-(Ce) and a phase which is assigned to B3S4 (i.e., bastnäsite-3-synchisite-4; still unnamed) fluorcarbonate. Transmission electron microscope (TEM) images reveal well-ordered stacking patterns of two monoclinic polytypes of parisite-(Ce) as well as heavily disordered layer sequences with varying lattice fringe spacings. The crystal structure refinement from single crystal X-ray diffraction data - impeded by twinning, complex stacking patterns, sequential and compositional faults - indicates that the dominant parisite-(Ce) polytype M1 has space group Cc. Parisite-(Ce), the B3S4 phase and röntgenite-(Ce) show different BSE intensities from high to low. Raman spectroscopic analyses of parisite-(Ce), the B3S4 phase and röntgenite-(Ce) reveal different intensity ratios of the three symmetric CO3 stretching bands at around 1100 cm?1. We propose to non-destructively differentiate parisite-(Ce) and röntgenite-(Ce) by their 1092 cm?1 / 1081 cm?1 ?1(CO3) band height ratio.
DS202104-0620
2021
Habler, G.Zeug, M., Nasdala, L., Ende, M., Habler, G., Hauzenbergerm C., Chanmuang, C.N., Skoda, R., Topa, D., Wildner, M., Wirth, R.The parisite-(De) enigma: challenges in the identification of fluorcarbonate minerals. REEMineralogy and Petrology, Vol 115, pp. 1-19. pdfSouth America, Columbiadeposit - La Pita

Abstract: A multi-methodological study was conducted in order to provide further insight into the structural and compositional complexity of rare earth element (REE) fluorcarbonates, with particular attention to their correct assignment to a mineral species. Polycrystals from La Pita Mine, Municipality de Maripí, Boyacá Department, Colombia, show syntaxic intergrowth of parisite-(Ce) with röntgenite-(Ce) and a phase which is assigned to B3S4 (i.e., bastnäsite-3-synchisite-4; still unnamed) fluorcarbonate. Transmission electron microscope (TEM) images reveal well-ordered stacking patterns of two monoclinic polytypes of parisite-(Ce) as well as heavily disordered layer sequences with varying lattice fringe spacings. The crystal structure refinement from single crystal X-ray diffraction data - impeded by twinning, complex stacking patterns, sequential and compositional faults - indicates that the dominant parisite-(Ce) polytype M1 has space group Cc. Parisite-(Ce), the B3S4 phase and röntgenite-(Ce) show different BSE intensities from high to low. Raman spectroscopic analyses of parisite-(Ce), the B3S4 phase and röntgenite-(Ce) reveal different intensity ratios of the three symmetric CO3 stretching bands at around 1100 cm-1. We propose to non-destructively differentiate parisite-(Ce) and röntgenite-(Ce) by their 1092 cm-1 / 1081 cm-1 ?1(CO3) band height ratio.
DS201502-0037
2015
Habtoor, A.Ahmed, A.H., Habtoor, A.Heterogeneously depleted Precambrian lithosphere deduced from mantle peridotites and associated chromitite deposits of Al, Ays ophiolite, northwestern Arabian shield, Saudi Arabia.Ore Geology Reviews, Vol. 67, pp. 279-296.Africa, Saudi ArabiaPeridotite

Abstract: The mantle section of Al'Ays ophiolite consists of heterogeneously depleted harzburgites, dunites and large-sized chromitite pods. Two chromitite-bearing sites (Site1 and Site2), about 10 km apart horizontally from one another, were examined for their upper mantle rocks. Cr-spinels from the two sites have different chemistry; Cr-rich in Site1 and Al-rich in Site2. The average Cr-ratio = (Cr/(Cr + Al) atomic ratio) of Cr-spinels in harzburgites, dunites and chromitites is remarkably high 0.78, 0.77 and 0.87, respectively, in Site1, compared with those of Site2 which have intermediate ratio averages 0.5, 0.56 and 0.6, respectively. The platinum-group elements (PGE) in chromitites also show contrasting patterns from Site1 to Site2; having elevated IPGE (Os, Ir, Ru) and strongly depleted in PPGE (Rh, Pt, Pd) with steep negative slopes in the former, and gentle negative slopes in the latter. The oxygen fugacity (?log fO2) values deduced from harzburgites and dunites of Site1 show a wide variation under reducing conditions, mostly below the FMQ buffer. The Site2 harzburgites and dunites, on the other hand are mostly above the FMQ buffer. Two magmatic stages are suggested for the lithospheric evolution of Al'Ays ophiolite in response to a switch of tectonic setting. The first stage produced a peridotites–chromitites suite with Al-rich Cr-spinels, possibly beneath a mid-ocean ridge setting, or most likely in back-arc rift of a supra-subduction zone setting. The second stage involved higher degrees of partial melting, produced a peridotites–chromitites suite with Cr-rich Cr-spinels, possibly in a fore-arc setting. The coexistence of compositionally different mantle suites with different melting histories in a restricted area of an ophiolite complex may be attributable to a mechanically juxtaposed by mantle convection during recycling. The mantle harzburgites and dunites are apt to be compositionally modified during recycling process; being highly depleted (Site1 case) than their original composition (Site2 case).
DS200712-0399
2007
Hack, A.C.Hack, A.C., Hermann, J., Mavrogenes, J.A.Mineral solubility and hydrous melting relations in the deep earth: analysis of some binary A-H2O system pressure-temperature composition topologies.American Journal of Science, Vol. 307, 5, pp. 833-855.MantleMelting - water
DS200812-0439
2008
Hack, A.C.Hack, A.C., Thompson, A.B.Quantification of dehydration and mass fluxes from subducting slabs.Goldschmidt Conference 2008, Abstract p.A339.MantleSubduction
DS201112-0399
2011
Hack, A.C.Hack, A.C., Thompson, A.B.Density and viscosity of hydrous magmas and related fluids and their role in subduction zone processes.Journal of Petrology, Vol. 52, 7-8, pp. 1333-1362.MantleSubduction
DS1940-0048
1942
Hack, J.T.Hack, J.T.Sedimentation and Volcanism in the Hopi Buttes, ArizonaGeological Society of America (GSA) Bulletin., Vol. 53, PP. 335-372.United States, Arizona, Colorado PlateauDiatreme
DS2001-1316
2001
Hacker, B.Zhou, D., Grhan, S.A., Chang, E.Z., Wang, B., Hacker, B.Paleozoic tectonic amalgamation of the Chinese Tian Shan: evidence from a transect along the Dushanzi-KugaGeological Society of America Memoir, No. 194, pp. 23-46.ChinaTectonics
DS200512-0385
2005
Hacker, B.Hacker, B., Luffi, P., Lutkov, V., Minaev, Metcalfe, Ratschbacher, Plank, Ducea, Patinodouce, McWiliamsNear ultrahigh pressure processing of continental crust: Miocene crustal xenoliths from the Pamir.Journal of Petrology, Vol. 46, 8, pp. 1661-1687.Asia, PamirXenoliths
DS200612-0515
2006
Hacker, B.Hacker, B., O'Brien, P.Continental crust subduction and recycling.Goldschmidt Conference 16th. Annual, S5-08 theme abstract 1/8p. goldschmidt2006.orgMantleSubduction
DS1994-0495
1994
Hacker, B.R.Ernst, W.G., Liou, J.G., Hacker, B.R.Petrotectonic significance of high and ultrahigh pressure metamorphicbelts: subduction zone historiesInternational Geology Review, Vol. 30, pp. 213-237United States, California, China, Dabie, Russia, KoreaTectonics, metamorphism
DS1995-0710
1995
Hacker, B.R.Hacker, B.R.What brought them up? Exhumation of ultrahigh pressure rocks in the Dabie Mountains of eastern China.Eos, Abstracts, Vol. 76, No. 17, Apr 25, p. S 283.ChinaCoesite, diamonds, metamorphic, Deposit -Dabie Mountains
DS1995-0711
1995
Hacker, B.R.Hacker, B.R., Qingchen WangArgon-Argon geochronology of ultrahigh pressure metamorphism in central China.Tectonics, Vol. 14, No. 4, August pp. 994-1006.ChinaGeochronology, Argon, Deposit -Dabie Shan area
DS1995-0712
1995
Hacker, B.R.Hacker, B.R., Ratschbacher, L., Webb, L., Shuwen, D.What brought them up? Exhumation of the Dabie Shan ultrahigh pressurerocks.Geology, Vol. 23, No. 8, August pp. 743-746.ChinaCoesite, diamond, Deposit -Dabie Shan area
DS1996-0579
1996
Hacker, B.R.Hacker, B.R., Zhang, R.Y.Very high pressure (10-15GPA) inclusions in ultrahigh pressure (4GPA)Chinese rocks.Geological Society of America, Abstracts, Vol. 28, No. 7, p. A-69.ChinaMetamorphic rocks
DS1998-0552
1998
Hacker, B.R.Hacker, B.R., Ratschacher, L., Shuwen, D.uranium-lead (U-Pb) zircon ages constrain the architecture of the ultrahigh pressure Qinling Dabie Orogen, China.Earth and Planetary Science Letters, Vol. 161, No. 1-4, Sept. 1, pp. 215-230.ChinaGeochronology, Dabie Shan area
DS2000-0375
2000
Hacker, B.R.Hacker, B.R., Andersen, T.B., Vasquez, A.M., Root, D.B.Exhumation of Norwegian ultra high pressure (UHP) eclogites: II. Plutonism and extension beneath the Solund Basin.Geological Society of America (GSA) Abstracts, Vol. 32, No. 7, p.A-32.NorwayEclogites, Subduction - slab
DS2000-0376
2000
Hacker, B.R.Hacker, B.R., Ratschbacher, L., Chateigner, D.Exhumation of the ultrahigh pressure continental crust in east central China: Late Triassic -Early JurassicJournal of Geophysical Research, Vol. 105, No. 6, June 10, pp. 13339-Chinaultra high pressure (UHP)
DS2000-0798
2000
Hacker, B.R.Ratschbacher, L., Hacker, B.R., Wenk, H-R.Exhumation of the ultrahigh pressure continental crust in east central China: Cretaceous and Cenozoic unroof..Journal of Geophysical Research, Vol. 105, No. 6, June 10, pp. 13303-20.Chinaultra high pressure (UHP)
DS2000-0999
2000
Hacker, B.R.Walsh, E.H., Hacker, B.R.Exhumation of Norwegian ultra high pressure (UHP) eclogites 1: foreland to hinterland regional variation in pressure - temperatureGeological Society of America (GSA) Abstracts, Vol. 32, No. 7, p.A-32.NorwayEclogites, Subduction - slab
DS2001-1045
2001
Hacker, B.R.Searle, M., Hacker, B.R., Bilham, R.The Hindu Kush seismic zone as a paradigm for the creation of ultrahigh pressure pressure diamond and coesite ...Journal of Geology, Vol. 109, pp. 143-53.Mantleultra high pressure (UHP) continental rocks, Subduction - ophiolites
DS2002-0627
2002
Hacker, B.R.Hacker, B.R., Calvert, A., Zhang, R.Y., Ernst, W.G., Liou, J.G.Ar Ar geochronology of diamond bearing metasedimentary rocks from the Kokchetav Massif.Frontiers Science Series, University Academy Press, Vol. 38, pp. 397-412.RussiaGeochronology
DS2002-0628
2002
Hacker, B.R.Hacker, B.R., Grove, M.Was UHP tectonism in Norway caused by ophiolite emplacement?Geological Society of America Annual Meeting Oct. 27-30, Abstract p. 511.NorwayUHP - not specific to diamonds
DS2003-0527
2003
Hacker, B.R.Hacker, B.R., Anderson, T.B., Root, D.B., Mehl, L., Mattinson, J.M., WoodenExhumation of high pressure rocks beneath the Solund Basin, Western gneiss regionJournal of Metamorphic Geology, Vol. 21, 6, pp. 613-30.NorwayUHP
DS2003-0528
2003
Hacker, B.R.Hacker, B.R., Calvert, A., Zhang, R.Y., Ernst, W.G., Liou, J.G.Ultrarapid exhumation of ultrahigh pressure diamond bearing metasedimentary rocks ofLithos, Vol. 70, 3-4, pp. 61-75.Russia, KazakhstanUHP
DS200412-0758
2003
Hacker, B.R.Hacker, B.R., Anderson, T.B., Root, D.B., Mehl, L., Mattinson, J.M., Wooden, J.L.Exhumation of high pressure rocks beneath the Solund Basin, Western gneiss region, Norway.Journal of Metamorphic Geology, Vol. 21, 6, pp. 613-30.Europe, NorwayUHP
DS200412-0759
2002
Hacker, B.R.Hacker, B.R., Calvert, A., Zhang, R.Y., Ernst, W.G., Liou, J.G.Ar Ar geochronology of diamond bearing metasedimentary rocks from the Kokchetav Massif.Frontiers Science Series, University Academy Press, Vol. 38, pp. 397-412.RussiaGeochronology
DS200412-0760
2003
Hacker, B.R.Hacker, B.R., Calvert, A., Zhang, R.Y., Ernst, W.G., Liou, J.G.Ultrarapid exhumation of ultrahigh pressure diamond bearing metasedimentary rocks of the Kokchetav Massif, Kazakhstan?Lithos, Vol. 70, 3-4, pp. 61-75.Russia, KazakhstanUHP
DS200412-2074
2004
Hacker, B.R.Walsh, E.O., Hacker, B.R.The fate of subducted continental margins; two stage exhumation of the high pressure ultrahigh pressure Western Gneiss region, NJournal of Metamorphic Geology, Vol. 22, 7, pp. 671-687.Europe, NorwayUHP - metamorphism, eclogites
DS200512-0910
2005
Hacker, B.R.Root, D.B., Hacker, B.R., Gans, P.B., Ducea, E.A., Eide, J.L.Discrete ultrahigh prssure domains in the Western Gneiss region, Norway: implications for formation and exhumation.Journal of Metamorphic Geology, Vol. 23, 1, pp. 45-61.Europe, NorwayUHP
DS200612-0516
2006
Hacker, B.R.Hacker, B.R.Duration of UHP tectonism.Geochimica et Cosmochimica Acta, Vol. 70, 18, p. 1. abstract only.MantleUHP, tectonics
DS200612-0517
2006
Hacker, B.R.Hacker, B.R., McClelland, W.C., Liou, J.G.Ultrahigh pressure metamorphism: deep continental subduction.Geological Society of America, Special Paper, No. 403, 200p.China, RussiaUHP, geochronology, subduction
DS200612-0518
2006
Hacker, B.R.Hacker, B.R., Wallis, S.R., Ratschbacher, L., Grove, M., Gehrels, G.High temperature geochronology constraints on the tectonic history and architecture of the ultrahigh pressure Dabie-Sulu Orogen.Tectonics, Vol. 25, 5, TC5006ChinaUHP, tectonics
DS200612-1130
2006
Hacker, B.R.Ratschbacher, L., Franz, L., Enkelmann, E., Jonckheere, R., Porschke, A., Hacker, B.R., Dong, S., Zhang, Y.The Sino-Korean Yangtze suture, the Huwan detachment and the Paleozoic Tertiary exhumation of ultra high pressure rocks along the Tongbai Xinxian Dabie Mtns.Geological Society of America, Special Paper, No. 403, pp. 45-76.ChinaUHP
DS200712-0400
2006
Hacker, B.R.Hacker, B.R.Pressures and temperatures of ultrahigh pressure metamorphism: implications for UHP tectonics and H2O in subducting slabs.International Geology Review, Vol. 48, 12, pp. 1053-1066.MantleUHP, subduction
DS200812-0328
2007
Hacker, B.R.Ernst, W.G., Hacker, B.R., Liou, J.G.Petrotectonics of ultrahigh pressure crustal and upper-mantle rocks - implications for Phanerozoic collisional orogens.Geological Society of America, Whence the Mountains? Inquiries into the evolution of orogenic system., pp. 27-49.MantleUHP subduction
DS200912-0275
2009
Hacker, B.R.Hacker, B.R., Wallis, S.R., McWilliams, M.O., Gans, P.B.40 Ar 39AR constraints on the tectonic history and architecture of the ultrahigh pressure Sulu orogen.Journal of Metamorphic Geology, Vol. 27, 9, pp. 827-844.ChinaUHP
DS200912-0421
2009
Hacker, B.R.Kylander Clar, A.R.C., Hacker, B.R., Johnson, C.M., Beard, B.L., Mahlen, N.Slow subduction of a thick ultrahigh pressure terrane.Tectonics, Vol. 28, 2, TC2003MantleUHP
DS201112-0300
2011
Hacker, B.R.Ellis, S.M., Little,T.A., Wallace, L.M.,Hacker, B.R., Buiter, S.J.H.Feedback between rifting and diapirism can exhume ultrahigh pressure rocks.Earth and Planetary Science Letters, Vol. 311, 3-4, pp. 427-438.AustraliaUHP
DS201112-0400
2011
Hacker, B.R.Hacker, B.R., Kelemen, P.B., Behn, M.D.Differentiation of the continental crust by relamination.Earth and Planetary Science Letters, Vol. 307, 3-4, pp. 501-516.MantleSubduction, bulk analyis
DS201112-1076
2011
Hacker, B.R.Van Keken, P.E., Hacker, B.R., Syracuse, E.M.,Abers, G.A.Subduction factory: 4. Depth dependent flux of H2O from subducting slabs worldwide.Journal of Geophysical Research, Vol. 116, B01401.MantleSubduction
DS201212-0055
2012
Hacker, B.R.Barcheck, C.G., Wiens, D.A., VanKeken, P.E., Hacker, B.R.The relationship of intermediate and deep focus seismicity to the hydration and dehydration of subducting slabs.Earth and Planetary Science Letters, Vol. 349-350 pp. 153-160.MantleSubduction
DS201212-0277
2012
Hacker, B.R.Hacker, B.R., Abers, G.A.Subduction factory 5: Unusually low Poisson's ratios in subduction zones from elastic anisotropy of peridotite.Journal of Geophysical Research, Vol. 117, B6, B06308.MantleSubduction
DS201212-0390
2012
Hacker, B.R.Kylander-Clark, A.R.C., Hacker, B.R., Mattinson, C.G.Size and exhumation rate of ultrahigh pressure terranes linked to orogenic stage.Earth and Planetary Science Letters, Vol. 321-322, pp. 115-120.MantleUHP
DS201312-0348
2013
Hacker, B.R.Hacker, B.R., Gerya, T.V.Paradigms, new and old, for ultrahigh-pressure tectonism.Tectonophysics, Vol. 603, pp. 79-88.MantleUHP
DS201312-0349
2013
Hacker, B.R.Hacker, B.R., Gerya, T.V., Gilotti, J.Formation and exhumation of ultrahigh pressure terranes.Elements, Vol. 9, 4, pp. 289-293.MantleUHP
DS201507-0314
2015
Hacker, B.R.Hacker, B.R., Kelemen, P.B., Behn, M.D.Continental lower crust.Annual Review of Earth and Planetary Sciences, Vol. 43, pp. 167-205.MantleSubduction
DS201607-1298
2016
Hacker, B.R.Hacker, B.R., Kelemen, P.B., Behn, M.D.Continental lower crust.Annual Review of Earth and Planetary Sciences, Vol. 43, pp. 167-205.MantleMagmatism

Abstract: The composition of much of Earth's lower continental crust is enigmatic. Wavespeeds require that 10 -20% of the lower third is mafic, but the available heat-flow and wavespeed constraints can be satisfied if lower continental crust elsewhere contains anywhere from 49 to 62 wt% SiO2. Thus, contrary to common belief, the lower crust in many regions could be relatively felsic, with SiO2 contents similar to andesites and dacites. Most lower crust is less dense than the underlying mantle, but mafic lowermost crust could be unstable and likely delaminates beneath rifts and arcs. During sediment subduction, subduction erosion, arc subduction, and continent subduction, mafic rocks become eclogites and may continue to descend into the mantle, whereas more silica-rich rocks are transformed into felsic gneisses that are less dense than peridotite but more dense than continental upper crust. These more felsic rocks may rise buoyantly, undergo decompression melting and melt extraction, and be relaminated to the base of the crust. As a result of this refining and differentiation process, such relatively felsic rocks could form much of Earth's lower crust.
DS201706-1062
2017
Hacker, B.R.Albers, G.A., van Keken, P.E., Hacker, B.R.The cold and relatively dry nature of mantle forearcs in subduction zones.Nature Geoscience, Vol. 10, 5, pp. 333-337.Mantlesubduction

Abstract: Some of Earth's coldest mantle is found in subduction zones at the tip of the mantle wedge that lies between the subducting and overriding plates. This forearc mantle is isolated from the flow of hot material beneath the volcanic arc, and so is inferred to reach temperatures no more than 600 to 800 °C — conditions at which hydrous mantle minerals should be stable. The forearc mantle could therefore constitute a significant reservoir for water if sufficient water is released from the subducting slab into the mantle wedge. Such a reservoir could hydrate the plate interface and has been invoked to aid the genesis of megathrust earthquakes and slow slip events. Our synthesis of results from thermal models that simulate the conditions for subduction zones globally, however, indicates that dehydration of subducting plates is too slow over the life span of a typical subduction zone to hydrate the forearc mantle. Hot subduction zones, where slabs dehydrate rapidly, are an exception. The hottest, most buoyant forearcs are most likely to survive plate collisions and be exhumed to the surface, so probably dominate the metamorphic rock record. Analysis of global seismic data confirms the generally dry nature of mantle forearcs. We conclude that many subduction zones probably liberate insufficient water to hydrate the shallower plate boundary where great earthquakes and slow slip events nucleate. Thus, we suggest that it is solid-state processes and not hydration that leads to weakening of the plate interface in cold subduction zones.
DS201707-1298
2017
Hacker, B.R.Abers, G.A., van Keken, P.E., Hacker, B.R.The cold and relatively dry nature of mantle forearcs in subduction zones.Nature Geoscience, Vol. 10, pp. 333-337.Mantlesubduction

Abstract: Some of Earth's coldest mantle is found in subduction zones at the tip of the mantle wedge that lies between the subducting and overriding plates. This forearc mantle is isolated from the flow of hot material beneath the volcanic arc, and so is inferred to reach temperatures no more than 600 to 800 °C - conditions at which hydrous mantle minerals should be stable. The forearc mantle could therefore constitute a significant reservoir for water if sufficient water is released from the subducting slab into the mantle wedge. Such a reservoir could hydrate the plate interface and has been invoked to aid the genesis of megathrust earthquakes and slow slip events. Our synthesis of results from thermal models that simulate the conditions for subduction zones globally, however, indicates that dehydration of subducting plates is too slow over the life span of a typical subduction zone to hydrate the forearc mantle. Hot subduction zones, where slabs dehydrate rapidly, are an exception. The hottest, most buoyant forearcs are most likely to survive plate collisions and be exhumed to the surface, so probably dominate the metamorphic rock record. Analysis of global seismic data confirms the generally dry nature of mantle forearcs. We conclude that many subduction zones probably liberate insufficient water to hydrate the shallower plate boundary where great earthquakes and slow slip events nucleate. Thus, we suggest that it is solid-state processes and not hydration that leads to weakening of the plate interface in cold subduction zones.
DS200712-1071
2006
Hackney, R.Tassera, A., Swain, C., Hackney, R., Kirby, J.Elastic thickness structure of South America estimated using wavelets and satellite - derived gravity data.Earth and Planetary Science Letters, in press availableSouth AmericaGeophysics - gravity Bouguer slab
DS1997-0462
1997
Hackspacher, P.C.Hackspacher, P.C., Dantas, E.L., Legrand, J.M.Northwestern Over thrusting and related lateral escape during the Brasiliano Orogeny north of Patos lineamentInternational Geology Review, Vol. 39, No. 7, July, pp. 609-638.Brazil, BorboremaTectonics, Orogeny
DS1998-0553
1998
Hackspacher, P.C.Hackspacher, P.C., Godoy, A.M.Vertical displacement during post collisional escape tectonism ( BrasilianoOrogeny) of the Ribeira Belt.Journal of African Earth Sciences, Vol. 27, 1A, p. 99. AbstractBrazilTectonics, Orogeny
DS1999-0279
1999
Hackspacher, P.C.Hackspacher, P.C., Godoy, A.M.Vertical displacement during late collisional escape tectonics (BrasilianoOrogeny) in the Ribeira Belt.Journal of African Earth Sciences, Vol. 29, No. 1, July pp. 25-32.Brazil, Sao PauloTectonics, Orogeny
DS200412-0405
2004
Hackspacher, P.C.Dantas, E.L., Van Schmus, W.R., Hackspacher, P.C., Fetter, A.H., De Brito Neves, B.B., Cordani, U., Nutman, A.The 3.4 3.5 Ga Sao Jose do Campestre Massif, NE Brazil: remnants of the oldest crust in South America.Precambrian Research, Vol. 130, 1-4, April 20, pp. 113-137.South America, BrazilGeochronology, Borborema
DS201903-0502
2019
Hackspacher, P.C.da Silva, B.V., Hackspacher, P.C., Siqueira Riberio, M.C., Glasmacher, U.A., Goncalves, A.O., Doranti-Tiritan, C., de Godoy, D.F., Constantino, R.R.Evolution of the southwestern Angolan margin: episodic burial and exhumation is more realistic than long term denudation.International Journal of Earth Sciences, Vol. 108, pp. 89-113.Africa, Angolathermochronology

Abstract: There are two main points of view regarding how continental margins evolve. The first one argues that the present-day margins have been developed by long-term denudation since a major exhumation episode, probably driven by rifting or another relevant tectonic event. The second one argues that continental margins underwent alternating burial and exhumation episodes related to crustal tectonic and surface uplift and subsidence. To demonstrate that the proximal domain of the southwestern Angolan margin has evolved in a polycyclic pattern, we present a review of geological and thermochronological information and integrate it with new combined apatite fission-track and (U-Th)/He data from Early Cretaceous volcanic and Precambrian basement samples. We also provide hypotheses on the possible mechanisms able to support the vertical crustal movements of this margin segment, which are also discussed based on some modern rifting models proposed for Central South Atlantic. The central apatite fission-track ages range from 120.6?±?8.9 to 272.9?±?21.6 Ma, with the mean track lengths of approximately 12 µm. The single-grain apatite (U-Th)/He ages vary between 52.2?±?1 and 177.2?±?2.6 Ma. The integration of the thermochronological data set with published geological constraints supports the following time-temperature evolution: (1) heating since the Carboniferous-Permian, (2) cooling onset in the Early Jurassic, (3) heating onset in the Early Cretaceous, (4) cooling onset in the Mid- to Late Cretaceous, (5) heating onset in the Late Cretaceous, and (6) cooling onset in the Oligocene-Miocene. The thermochronological data and the geological constraints, support that the proximal domain of the southwestern Angolan margin was covered in the past by pre-, syn-, and post-rift sediments, which were eroded during succeeding exhumation events. For this margin segment, we show that a development based on long-term denudation is less realistic than one based on burial and exhumation episodes during the last 130 Myr.
DS202007-1144
2020
Haddock, D.Haddock, D., Manya, S., Brown, R.J., Jones, T.J., Wadsworth, F.B., Dobson, K.J., Gernon, T.M.Syn-eruptive agglutination of kimberlite volcanic ash. PyroclastsVolcanica, Vol. 3, 1, pp. 169-182. PdfAfrica, Tanzaniadeposit - Igwisi Hills

Abstract: Pyroclastic deposits of the Holocene Igwisi Hills kimberlite volcanoes, Tanzania, preserve unequivocal evidence for rapid, syn-eruptive agglutination. The unusual pyroclasts are composed of ash-sized particles agglutinated to each other by thin necks. The textures suggest the magma was disrupted into droplets during ascent. Collisions between particles occurred within a volcanic plume and on deposition within the conduit to form a weakly agglutinated, porous pyroclastic deposit. Theoretical considerations indicate that agglutination occurred over short timescales. Agglutinated clasts were entrained into weak volcanic plumes and deposited around the craters. Our results support the notion that agglutination can occur during kimberlite eruptions, and that some coherent, dense rocks in ancient kimberlite pipes interpreted as intrusive rocks could instead represent agglutinated pyroclastic rocks. Differentiating between agglutinated pyroclastic rocks and effusive or intrusive rocks in kimberlite pipes is important because of the potential effects that pyroclastic processes might have on diamond concentrations in deposits.
DS202011-2040
2020
Haddock, D.Haddock, D., Manya, S., Brown, R.J., Jones, T.J., Wadsworth, F.B., Dobson, K.J., Gernon, T.M.Syn-eruptive agglutination of kimberlite volcanic ash.Volcanica, 15p. PdfAfrica, Tanzaniadeposit - Igwisi Hills kimberlite

Abstract: Pyroclastic deposits of the Holocene Igwisi Hills kimberlite volcanoes, Tanzania, preserve unequivocal evidence for rapid, syn-eruptive agglutination. The unusual pyroclasts are composed of ash-sized particles agglutinated to each other by thin necks. The textures suggest the magma was disrupted into droplets during ascent. Collisions between particles occurred within a volcanic plume and on deposition within the conduit to form a weakly agglutinated, porous pyroclastic deposit. Theoretical considerations indicate that agglutination occurred over short timescales. Agglutinated clasts were entrained into weak volcanic plumes and deposited around the craters. Our results support the notion that agglutination can occur during kimberlite eruptions, and that some coherent, dense rocks in ancient kimberlite pipes interpreted as intrusive rocks could instead represent agglutinated pyroclastic rocks. Differentiating between agglutinated pyroclastic rocks and effusive or intrusive rocks in kimberlite pipes is important because of the potential effects that pyroclastic processes might have on diamond concentrations in deposits.
DS1988-0280
1988
Haddon, R.A.W.Haddon, R.A.W., Buchbinder, G.G.R.Seismic wave scattering and the earth's structure in the lower mantleAmerican Geophysical Union (AGU) Monograph, Structure and dynmaics of earth's deep interior, No. 46, Conference Information 19th. IUGG, pp. 65-71GlobalMantle, Geophysics -seismics
DS1993-0609
1993
Haddon, R.C.Haddon, R.C.Chemistry of the fullerenes: the manifestations of strain in a class of continuous aromatic molecules.Science, Vol. 261, No. 5128, September 17, pp. 1545-1550.GlobalFullerenes, Chemistry
DS1994-0689
1994
Haddon, R.C.Haddon, R.C.From the outside in- fullerenesNature, Vol. 367, January 20, pp. 214.GlobalCarbon cycle
DS1994-0690
1994
Haddon, R.C.Haddon, R.C.Fullerenes: from the outside inNature, Vol. 367, No. 6460, January 20, p. 214.GlobalFullerenes
DS1995-0713
1995
Haddon, R.C.Haddon, R.C.Magnetism of the carbon allotropesNature, Vol. 378, Nov. 10, pp. 249-255.GlobalMagnetism, Graphite, diamond, fullerenes
DS1989-0528
1989
Hadezhdina, Ye.D.Gorogotskaya, L.I., Kvasnitsa, V.N., Hadezhdina, Ye.D.Orientation relations of graphite-lonsdaleite-diamond during natural transformations in shock waves.(Russian)Mineral. Zhurn., (Russian), Vol. 11, No. 1, pp. 26-33RussiaLonsdaleite, Mineraloggy
DS201412-0328
2014
Hadfield, C.Hadfield, C.A rock from the deep beyond. .. PallasiteNational Post, May 28, 2p.TechnologyMeteorite
DS2003-1123
2003
Hadlari, T.Rainbird, R.H., Hadlari, T., Aspler, L.B., Donaldson, J.A., Le Cheminant, A.N.Sequence stratigraphy and evolution of the Paleoproterozoic intracontinental BakerPrecambrian Research, Vol. 125, 1-2, pp. 21-53.NunavutBlank
DS200412-1609
2003
Hadlari, T.Rainbird, R.H., Hadlari, T., Aspler, L.B., Donaldson, J.A., Le Cheminant, A.N., Peterson, T.D.Sequence stratigraphy and evolution of the Paleoproterozoic intracontinental Baker Lake and The lon Basins, western Churchill ProPrecambrian Research, Vol. 125, 1-2, pp. 21-53.Canada, NunavutGeology
DS1984-0330
1984
Hadley, W.D.Hadley, W.D.A New Look at Idar ObersteinRock And Gem., Vol. 14, No. 10, PP. 48-51.GermanyCutting Industry
DS200612-0519
2006
Hae, R.Hae, R., Ohtani, E., Kubo, T., Koyama, T., Utada, H.Hydrogen diffusivity in wadsleyite and water distribution in the mantle transition zone.Earth and Planetary Science Letters, Vol. 243,1-2, Mar. 15, pp. 141-148.MantleIR spectroscopy
DS1986-0326
1986
Haebig, A.E.Haebig, A.E., Jackson, D.G.Geochemical expression of some west Australian kimberlites andlamproitesProceedings of the Fourth International Kimberlite Conference, Held Perth, Australia, No. 16, pp. 466-468AustraliaDiamond exploration
DS1989-0345
1989
Haebig, A.E.Deakin, A.S., Boxer, G.L., Meakins, A.E., Haebig, A.E., Lew, J.H.Geology of the Argyle alluvial diamond deposits #2Geological Society of Australia Inc. Blackwell Scientific Publishing, No. 14, Vol. 2, pp. 1108-1116AustraliaAlluvial-placers, Deposit -Argyle
DS1991-1608
1991
Haebig, A.E.Smith, C.B., Haebig, A.E., Hall, A.E.Patterns of diamond and kimberlite indicator mineral dispersal in the Kimberley region, western AustraliaProceedings of Fifth International Kimberlite Conference held Araxa June 1991, Servico Geologico do Brasil (CPRM) Special, pp. 376-379AustraliaHeavy mineral sampling, weathering, Lamproites, kimberlites, Argyle type diamonds
DS1986-0174
1986
Haebig, E.Deakin, A.S., Boxer, G.L., Meakins, A.E., Haebig, E., Lew, J.H.Geology of the Argyle alluvial diamond deposits #1Proceedings of the Fourth International Kimberlite Conference, Held, No. 16, pp. 451-453AustraliaDiamond exploration
DS202107-1097
2021
Haeger, C.Finger, N-P., Kaban, M.K., Tesauro, M., Haeger, C., Mooney, W.D., Thomas, M.A thermo-compositional model of the cratonic lithosphere of South America. Geochemistry, Geophysics, Geosytems, 26p. PdfSouth Americageothermometry

Abstract: The lithosphere and upper mantle of South America is investigated using multiple data sets, including the topography, crustal structure, regional seismic tomography, gravity, and mineral physics. These data are jointly inverted to estimate variations in temperature, density and composition in the lithospheric and sub-lithospheric upper mantle to a depth of 325 km. Our results show significant variations in lithospheric properties, including thick, depleted roots beneath large parts of the Amazon, São Francisco, and Paranapanema Cratons. However, portions of some cratons, such as the western Guyana Shield, lack a depleted root. We hypothesize that these regions either never developed a depleted root, or that the root was rejuvenated by lithospheric processes.
DS201012-0318
2010
Haemycong, J.Jaesok, L., Haemycong, J.Lattice preferred orientation of olivine in garnet peridotites from Finsch, South Africa.International Mineralogical Association meeting August Budapest, abstract p. 216.Africa, South AfricaSpectroscopy
DS201712-2712
2017
Haemyeong, J.H.Nestola, F., Haemyeong, J.H., Taylor, L.A.Mineral inclusions in diamonds may be synchronous but not syngenetic.Nature Communications, Vol. 8, # 14168Technologydiamond inclusions

Abstract: It is widely assumed that mineral inclusions and their host diamonds are ‘syngenetic’ in origin, which means that they formed simultaneously and from the same chemical processes. Mineral inclusions that, instead, were formed earlier with respect to diamonds are termed protogenetic. However, minerals can have the same age as the diamonds in that they become enclosed in and isolated from any further isotopic exchange. But this is termed ‘synchronous’ not ‘syngenetic’. Here we demonstrate conclusively the protogenesis of inclusions in diamonds, based upon data from an exceptional fragment of a diamond-bearing peridotite, its clinopyroxene and a gem-quality diamond. Clinopyroxenes in the xenolith had the same chemistry and crystallographic orientation as those for inclusions in the diamond. With our results with garnets, olivines and sulfides, we can state that a major portion of the mineral inclusions in non-coated, monocrystalline-lithospheric diamonds are protogenetic. Our discovery here presented has implications for all genetic aspects of diamond growth, including their ages.
DS201312-0202
2013
Haenecour, P.DeBaille, V., O'Neill, C., Brandon, A.D., Haenecour, P., Yin, Q-Z., Mattielli, N., Trieman, A.H.Stagnant lid tectonics in early Earth revealed bu 142 Nd variations in late Archean rocks.Earth and Planetary Science Letters, Vol. 373, pp. 83-92.MantleConvection
DS201904-0791
2019
Haenen, K.Vanpoucke, D.E.P., Nicely, S.S., Raymakers, J., Maes, W., Haenen, K.Can europium atoms form luminescent centres in diamond: a combined theoretical-experimental study.Diamond and Related Materials, https://doi.org/j. diamond.2019.02.024Globaldiamond morphology

Abstract: The incorporation of Eu into the diamond lattice is investigated in a combined theoretical-experimental study. The large size of the Eu ion induces a strain on the host lattice, which is minimal for the Eu-vacancy complex. The oxidation state of Eu is calculated to be 3+ for all defect models considered. In contrast, the total charge of the defect-complexes is shown to be negative: ?1.5 to ?2.3 electron. Hybrid-functional electronic-band-structures show the luminescence of the Eu defect to be strongly dependent on the local defect geometry. The 4-coordinated Eu substitutional dopant is the most promising candidate to present the typical Eu3+ luminescence, while the 6-coordinated Eu-vacancy complex is expected not to present any luminescent behaviour. Preliminary experimental results on the treatment of diamond films with Eu-containing precursor indicate the possible incorporation of Eu into diamond films treated by drop-casting. Changes in the PL spectrum, with the main luminescent peak shifting from approximately 614?nm to 611?nm after the growth plasma exposure, and the appearance of a shoulder peak at 625?nm indicate the potential incorporation. Drop-casting treatment with an electronegative polymer material was shown not to be necessary to observe the Eu signature following the plasma exposure, and increased the background luminescence.
DS201905-1083
2019
Haenen, K.Vanpoucke, D.E.P., Nicley, S.S., Raymakers, J., Maes, W., Haenen, K.Can europium atoms form luminescent centres in diamond: a combined theoretical-experimental study.Diamond & Related Materials, Vol. 94, pp. 233-241.Globalluminescence

Abstract: The incorporation of Eu into the diamond lattice is investigated in a combined theoretical-experimental study. The large size of the Eu ion induces a strain on the host lattice, which is minimal for the Eu-vacancy complex. The oxidation state of Eu is calculated to be 3+ for all defect models considered. In contrast, the total charge of the defect-complexes is shown to be negative: ?1.5 to ?2.3 electron. Hybrid-functional electronic-band-structures show the luminescence of the Eu defect to be strongly dependent on the local defect geometry. The 4-coordinated Eu substitutional dopant is the most promising candidate to present the typical Eu3+ luminescence, while the 6-coordinated Eu-vacancy complex is expected not to present any luminescent behaviour. Preliminary experimental results on the treatment of diamond films with Eu-containing precursor indicate the possible incorporation of Eu into diamond films treated by drop-casting. Changes in the PL spectrum, with the main luminescent peak shifting from approximately 614?nm to 611?nm after the growth plasma exposure, and the appearance of a shoulder peak at 625?nm indicate the potential incorporation. Drop-casting treatment with an electronegative polymer material was shown not to be necessary to observe the Eu signature following the plasma exposure, and increased the background luminescence.
DS1986-0327
1986
Haensel, J.M.Jr.Haensel, J.M.Jr., Himmelberg, G.R., Ford, A.B.Plagioclase compositional variations in anorthosites of the lower part Of the Dufek intrusionAntarctic Journal of the United States, Vol. 21, No. 5, pp. 61-63AntarcticaDufek
DS1920-0072
1921
Hafer, C.Hafer, C.Placer Gold in IndianaEngineering and Mining Journal, Vol. 111, JUNE 18TH. P. 1023.United States, Indiana, Great LakesBlank
DS201312-0241
2013
Hafid, A.El Bahat, A., Ikenne, M., Soderlund, U., Cousens, B., Youbi, N., Ernst, R., Soulaimani, A., El Janati, M., Hafid, A.U PB baddeleyite ages and geochemistry of dolerite dykes in the Bas Draa In lier of the Anti-Atlas of Morocco: newly identified Ma event in the West African craton.Lithos, Vol. 174, pp. 85-98.Africa, MoroccoGeochronology
DS201312-0511
2013
Hafid, A.Kouyate, D., Soderlund, U., Youbi, N., Ernst, R., Hafid, A., Ikeene, M., Soulaimani, A., Betrand, H., El Janati, M., Rkha, C.U Pb baddeleyite and zircon ages of 2040 Ma, 1650 Ma and 885 Ma on dolerites in the West African Craton ( Anti-Atlas inliers) : possible links to break up of Precambrian supercontinents.Lithos, Vol. 174, pp. 71-84.AfricaGeochronology
DS201312-0999
2013
Hafid, A.Youbi, N., Kouyate, D., Soderlund, U., Ernst, R.E., Soulaimani, A., Hafid, A., Ikenne, M., El Bahat, A., Betrand, H., Chaham, K.R., Ben Abbou, M., Mortaji, A., El Ghorfi, M., Zouhair, M., El Janati, M.The 1750 Ma magmatic event of the West African Craton ( Anti-Atlas) Morocco.Precambrian Research, Vol. 236, pp. 106-123.Africa, MoroccoDike swarms
DS201805-0952
2017
Hafid, A.Ikenne, M., Lahna, A.A., Soderlund, U., Tassinar, C.C.G., Ernst, R.E., Pin, Ch., Youbi, N., El Aouli, EH., Hafid, A., Admou, H., Mata, J., Bouougri, EH., Boumehdi, M.A.New Mesoproterozoic age constraints for the Taghdout Group, Anti-Atlas ( Morocco): toward a new lithostratigra[hic framework for the Precambrian in the NW margin of the West African Craton.The First West African Craton and Margins International Workshop WACMA, Held Apr. 24-29. 1p. AbstractAfrica, Moroccogeochronology
DS1997-1003
1997
Hafner, S.S.Scherer, T., Hafner, S.S., et al.Defects in natural diamonds depending on geological environmentProceedings 30th. I.G.C., Pt. 16, pp. 1-15.South Africa, Germany, RussiaDiamond morphology, Deposit - Finsch, Popigai
DS201212-0750
2012
Haga Laksmi, V.Vani, T., Haga Laksmi, V., Ramakrishnarao, M.V., Kelly, G.R., Subbarao, K.V.Integration of geophsyical and geological dat a of kimberlites in Narayayanapet - Maddur field, Andhra Pradesh, India.10th. International Kimberlite Conference Feb. 6-11, Bangalore India, AbstractIndia, Andhra PradeshDeposit - Narayayanapet-Maddur
DS201412-0475
2014
Hagadorn, J.W.Kosman, C.W., Kopylova, M.G., Hagadorn, J.W., Hurlburt, J.F.First dat a on the Diamondiferous mantle of the Kasai Shield, (Congo Craton) from diamond mineral inclusions.Geological Society of America Conference Vancouver Oct. 19-22, 1p. AbstractAfrica, Democratic Republic of CongoDiamond morphology, inclusions
DS201610-1881
2016
Hagadorn, J.W.Kosman, C.W., Kopylova, M.G., Stern, R.A., Hagadorn, J.W., Hurlbut, J.F.Cretaceous mantle of the Congo craton: evidence from mineral and fluid inclusions in Kasai alluvial diamonds.Lithos, in press available 15p.Africa, Democratic Republic of CongoDeposit - Kasai

Abstract: Alluvial diamonds from the Kasai River, Democratic Republic of the Congo (DRC) are sourced from Cretaceous kimberlites of the Lucapa graben in Angola. Analysis of 40 inclusion-bearing diamonds provides new insights into the characteristics and evolution of ancient lithospheric mantle of the Congo craton. Silicate inclusions permitted us to classify diamonds as peridotitic, containing Fo91-95 and En92-94, (23 diamonds, 70% of the suite), and eclogitic, containing Cr-poor pyrope and omphacite with 11-27% jadeite (6 diamonds, 18% of the suite). Fluid inclusion compositions of fibrous diamonds are moderately to highly silicic, matching compositions of diamond-forming fluids from other DRC diamonds. Regional homogeneity of Congo fibrous diamond fluid inclusion compositions suggests spatially extensive homogenization of Cretaceous diamond forming fluids within the Congo lithospheric mantle. In situ cathodoluminescence, secondary ion mass spectrometry and Fourier transform infrared spectroscopy reveal large heterogeneities in N, N aggregation into B-centers (NB), and ?13C, indicating that diamonds grew episodically from fluids of distinct sources. Peridotitic diamonds contain up to 2962 ppm N, show 0-88% NB, and have ?13C isotopic compositions from ? 12.5‰ to ? 1.9‰ with a mode near mantle-like values. Eclogitic diamonds contain 14-1432 ppm N, NB spanning 29%-68%, and wider and lighter ?13C isotopic compositions of ? 17.8‰ to ? 3.4‰. Fibrous diamonds on average contain more N (up to 2976 ppm) and are restricted in ?13C from ? 4.1‰ to ? 9.4‰. Clinopyroxene-garnet thermobarometry suggests diamond formation at 1350-1375 °C at 5.8 to 6.3 GPa, whereas N aggregation thermometry yields diamond residence temperatures between 1000 and 1280 °C, if the assumed mantle residence time is 0.9-3.3 Ga. Integrated geothermobaromtery indicates heat fluxes of 41-44 mW/m2 during diamond formation and a lithosphere-asthenosphere boundary (LAB) at 190-210 km. The hotter-than-average cratonic mantle may be attributable to contemporaneous rifting of the southern Atlantic, multiple post-Archean reactivations of the craton, and/or proximal Cretaceous plumes.
DS201906-1299
2019
Hagedorn, G.Hagedorn, G., Ross, M., Paulen, R., Smith, R., Neudorf, C., Gingerich, T., Lian, O.Ice-flow and deglacial history of the Laurentide Ice sheet in the southwestern Great Slave Lake area.GAC/MAC annual Meeting, 1p. Abstract p. 102.Canada, Northwest Territoriesgeomorphology

Abstract: Limited field studies and sparse chronological constraints in the southwestern Great Slave Lake area creates uncertainties about the Laurentide Ice Sheet (LIS) flow history and deglacial chronology. Improved understanding of the western LIS ice-margin morphology and retreat history is required to refine larger ice-sheet interpretations and timing for northwest drainage of glacial Lake McConnell. Using new field observations and geochronology we establish ice-flow history and better constrain regional deglaciation. Paleo-ice flow indicators (n = 66) show an oldest southwestern flow (230°), an intermediate northwesterly flow (305°), and a youngest westerly flow (250°). Till samples bulk sediment and matrix properties (n = 160) allowed identification of two till units. A lower grey till sourced mainly from local Paleozoic sediments produced clast fabrics indicating a southwesterly flow direction, overlain by a brown till that contained an increased Canadian Shield content with lodged elongate boulders a-axes and boulder-top striation orientations indicating a west to northwest ice-flow direction. Ice-flow results show a clockwise shift in direction interpreted as evidence for ice-divide migration followed by topographically controlled deglacial westward flow influenced by the Mackenzie River valley. Minimum deglacial timing estimates were constrained through optical dating of fine-sand deposits in a well-developed strandline (n = 2) and seven aeolian dunes; ages range from 9.9 ± 0.6 to 10.8 ± 0.7 ka BP. These ages are from dunes located below glacial Lake McConnell maximum water level and may thus provide new local lake level age constraints. Ice retreat is informed by a newly-mapped segment of the Snake River moraine, which is an understudied feature in the region. New ice-flow history and ice-margin retreat interpretations will be integrated into the larger body of work on the western LIS providing more confident conclusions on ice-sheet evolution and meltwater drainage pathways, specifically in the southwestern Great Slave Lake area.
DS201906-1332
2019
Hagedorn, G.Paulen, R., Smith, R., Ross, M., Hagedorn, G., Rice, J.Ice-flow history of the Laurentide Ice sheet in the southwestern Great Slave Lake area, a shield to Cordillera transect.GAC/MAC annual Meeting, 1p. Abstract p. 156. Canada, Northwest Territoriesgeomorphology

Abstract: Fieldwork conducted since 2010 by the Geological Survey of Canada under the GEM programs has revealed a more complex glacial history of the southern Great Slave Lake region of the Northwest Territories than was previously reported. New reconstructions of the Laurentide Ice Sheet paleo-ice flow history have been established from field observations of erosional and/or depositional ice-flow indicators (e.g. striae, bedrock grooves, till clast fabrics, and streamlined landforms), new geochronological constraints, and interpretations of glacial stratigraphy. Three distinct ice-flow phases are consistently observed in areas proximal to the western margin of the Canadian Shield between the Slave River near Fort Smith and Hay River further west. These phases are: 1) an oldest southwest flow; 2) a long-term sustained ice flow to the northwest; and, 3) a youngest west-southwest flow during Late Wisconsin deglaciation, which includes extensions of the Great Slave Lake and Hay River ice streams further east than previous mapped. At Hay River approaching the eastern limit of soft Cretaceous bedrock of the Western Canada Sedimentary Basin, the ice flow pattern no longer shows the aforementioned consistent chronology. From Hay River to the Liard River, near the zone where the Laurentide and Cordilleran ice sheet coalesced, a thinning ice profile, topographic highlands such as the Cameron Hills and Horn Plateau, and the deep basin that Great Slave Lake currently occupies, played a significant role on the dynamics of the Laurentide Ice Sheet during early ice advance, retreat during Marine Isotope Stage 3, Late Wisconsin advance and deglaciation. Other factors, such as increased sediment supply and clay content from Cretaceous shale bedrock were also significant in influencing ice-sheet behaviour. The role of elevated porewater pressures over subglacial clay-rich sediments controlled the extent and dynamics of several discordant ice streams in upland and lowland regions within the study area.
DS2003-0185
2003
Hagelberg, C.R.Bunge, H.P., Hagelberg, C.R., Travis, B.J.Mantle circulation models with variational dat a assimilation: inferring past mantle flowGeophysical Journal International, Vol. 152, No. 2, pp. 280-301.MantleGeophysics - seismics
DS1985-0255
1985
Hageluken, C.Hageluken, C.Mining Industry in Sierra Leone.(in German)Braunkohle, (in German), Vol. 37, No. 1/2. Jan./Feb. pp. 11-18Sierra LeoneDiamond Production, Economics
DS201806-1233
2018
Hageman, L.Koornneef, J.M., Berndsen, M., Hageman, L., Gress, M.U., Timmerman, S., Nikogosian, I., van Bergen, M.J., Chinn, I.L., Harris, J.W., Davies, G.R.Melt and mineral inclusions as messengers of volatile recycling in space and time. ( olivine hosted inclusions)Geophysical Research Abstracts www.researchgate.net, Vol. 20, EGU2018-128291p. AbstractAfrica, South Africadiamond inclusions

Abstract: Changing recycling budgets of surface materials and volatiles by subduction of tectonic plates influence the compositions of Earth’s major reservoirs and affect climate throughout geological time. Fluids play a key role in processes governing subduction recycling, but quantifying the exact fate of volatiles introduced into the mantle at ancient and recent destructive plate boundaries remains difficult. Here, we report on the role of fluids and the fate of volatiles and other elements at two very different tectonic settings: 1) at subduction settings, and 2) within the subcontinental lithospheric mantle (SCLM). We will show how olivine-hosted melt inclusions from subduction zones and mineral inclusions in diamond from the SCLM are used to reveal how changing tectonic settings influence volatile cycles with time. Melt inclusions from the complex Italian post-collisional tectonic setting are used to identify changing subduction recycling through time. The use of CO2 in deeply trapped melt inclusions instead of in lavas or volcanic gases provides a direct estimate of deep recycling, minimizing possible effects of contamination during transfer through the crust. The aim is to distinguish if increased recycling of sediments from the down-going plate at continental subduction settings results in increased deep CO2 recycling or if the increased CO2 flux results from crustal degassing of the overriding plate. Both processes likely affected climate through Earth history but could thus far not be discriminated. The study of mineral inclusions and their host diamonds from the SCLM can link changes in the cycling of carbon-rich fluids and the time and process through which the carbon redistribution took place. We use Sm-Nd isotope techniques to date the mineral inclusions and use the carbon isotope data of the host diamonds to investigate the growth conditions. I will present case-studies of peridotitic and eclogitic diamonds from three mines in Southern Africa.
DS1990-0628
1990
Hagen, H.Hagen, H., Neumann, E-R.Modelling of trace element distribution in magma chambers using open systemmodelsComputers and Geosciences, Vol. 16, No. 4, pp. 549-586GlobalComputer, Program -trace elements
DS201611-2132
2016
Hagen-Peter, G.A.Poletti, J.E., Cottle, J.M., Hagen-Peter, G.A., Lackey, J.S.Petrochronological constraints on the origin of the Mountain Pass ultrapotassic and carbonatite intrusive suite, California.Journal of Petrology, In press available, 44p.United States, CaliforniaCarbonatite

Abstract: Rare earth element (REE) ore-bearing carbonatite dikes and a stock at Mountain Pass, California, are spatially associated with a suite of ultrapotassic plutonic rocks, and it has been proposed that the two are genetically related. This hypothesis is problematic, given that existing geochronological constraints indicate that the carbonatite is ?15-25 Myr younger than the ultrapotassic rocks, requiring alternative models for the formation of the REE ore-bearing carbonatite during a separate event and/or via a different mechanism. New laser ablation split-stream inductively coupled plasma mass spectrometry (LASS-ICP-MS) petrochronological data from ultrapotassic intrusive rocks from Mountain Pass yield titanite and zircon U-Pb dates from 1429?±?10 to 1385?±?18?Ma, expanding the age range of the ultrapotassic rocks in the complex by ?20 Myr. The ages of the youngest ultrapotassic rocks overlap monazite Th-Pb ages from a carbonatite dike and the main carbonatite ore body (1396?±?16 and 1371?±?10?Ma, respectively). The Hf isotope compositions of zircon in the ultrapotassic rocks are uniform, both within and between samples, with a weighted mean ?Hfi of 1•9?±?0•2 (MSWD?=?0•9), indicating derivation from a common, isotopically homogeneous source. In contrast, in situ Nd isotopic data for titanite in the ultrapotassic rocks are variable (?Ndi?=?-3•5 to -12), suggesting variable contamination by an isotopically enriched source. The most primitive ?Ndi isotopic signatures, however, do overlap ?Ndi from monazite (?Ndi?=?-2•8?±?0•2) and bastnäsite (?Ndi?=?-3•2?±?0•3) in the ore-bearing carbonatite, suggesting derivation from a common source. The data presented here indicate that ultrapotassic magmatism occurred in up to three phases at Mountain Pass (?1425, ?1405, and ?1380?Ma). The latter two stages were coeval with carbonatite magmatism, revealing previously unrecognized synchronicity in ultrapotassic and carbonatite magmatism at Mountain Pass. Despite this temporal overlap, major and trace element geochemical data are inconsistent with derivation of the carbonatite and ultrapotassic rocks by liquid immiscibility or fractional crystallization from common parental magma. Instead, we propose that the carbonatite was generated as a primary melt from the same source as the ultrapotassic rocks, and that although it is unique, the Mountain Pass ultrapotassic and carbonatite suite is broadly similar to other alkaline silicate-carbonatite occurrences in which the two rock types were generated as separate mantle melts.
DS1991-0641
1991
Hagens, A.Hagens, A., Doveton, J.H.Application of a simple cerebellar model to geologic surface mappingComputers and Geosciences, Vol. 17, No. 4, pp. 561-568GlobalComputers, Surface mapping
DS1999-0144
1999
Hager, B.H.Conrad, C.P., Hager, B.H.The thermal evolution of an earth with strong subduction zonesGeophysical Research Letters, Vol. 26, No. 19, Oct. 1, pp. 3041-44.MantleLithosphere, Subduction
DS1999-0145
1999
Hager, B.H.Conrad, C.P., Hager, B.H.Effects of plate bending and fault strength at subduction zones on platedynamics.Journal of Geophysical Research, Vol. 104, No. 8, Aug. 10, pp. 17, 551-72.MantleTectonics, Subduction
DS1999-0651
1999
Hager, B.H.Shapiro, S.S., Hager, B.H., Jordan, T.H.Stability and dynamics of the continental tectosphereLithos, Vol. 48, No. 1-4, Sept. pp. 115-34.MantleGeodynamics, Craton
DS1999-0652
1999
Hager, B.H.Shapiro, S.S., Hager, B.H., Jordan, T.H.The continental tectosphere and earth's long wave length gravity fieldLithos, Vol. 48, No. 1-4, Sept. pp. 135-52.MantleGeodynamics, Geophysics - gravity
DS200512-0429
2004
Hager, B.H.Hetland, E.A., Hager, B.H.Relationship of geodetic velocities to velocities in the mantle.Geophysical Research Letters, Vol. 31, 17, Sept. 16, L17604.MantleGeophysics
DS1982-0237
1982
Hager, J.M.Hager, J.M.Approximating the Bedrock Topography of Clark County, Ohio, using the Gravity Method.Msc. Thesis, Wright State University, 101P.GlobalMid-continent
DS1994-0691
1994
Hager, J.P.Hager, J.P., Hansen, B.J., et al.Extraction and processing for the treatment and minimization of wastes1994Tms, 1, 1153 pUnited StatesWaste treatment, Book -ad
DS201012-0664
2010
Hager, T.Satikune, S., Zubko, M., Hager, T., Kusz, J., Hofmeister, W.Mineral chemistry and structural relationships of inclusions in diamond crystals. Koffiefontein and FinschInternational Mineralogical Association meeting August Budapest, abstract p. 25.Africa, South AfricaDiamond inclusions
DS1960-0351
1963
Haggard, H.J.E.Haggard, H.J.E.Review of the Yengema Diamond FieldSierra Leone Selection Trust Ltd., UNPUB.Sierra Leone, West AfricaGeology
DS1960-0835
1967
Haggard, H.J.E.Haggard, H.J.E.Notes on Diamond ProspectingC.a.s.t. And Selection Trust Files, South AfricaBlank
DS1991-1310
1991
HaggertyPearson, D.G., Boyd, F.R., Field, S.W., Pasteris, J.D., HaggertyGraphite bearing peridotites from the Kaapvaal craton: their carbon isotopic compositions and implications for peridotite thermobarometryProceedings of Fifth International Kimberlite Conference held Araxa June 1991, Servico Geologico do Brasil (CPRM) Special, pp. 323-325South Africa, LesothoKimberley, Jagersfontein, spectrometry, Carbon composition -table
DS2003-1020
2003
HaggertyNowell, G.M., Pearson, D.G., Jacob, D.E., Spetsius, S., Nixon, P.H., HaggertyThe origin of alkremites and related rocks: a Lu Hf Rb Sr and Sm Nd isotope study8ikc, Www.venuewest.com/8ikc/program.htm, Session 4, POSTER abstractRussia, YakutiaMantle geochemistry, Deposit - Udachnaya
DS202203-0370
2022
Haggerty, R.S.Wang, Ze-Zhou, Liu, S,-A., Rudnick, R.L., Haggerty, R.S.Zinc isotope evidence for carbonate alteration of oceanic crustal protoliths of cratonic eclogites,Earth and Planetary Science Letters, Vol. 580, 11p. PdfMantleeclogites

Abstract: Zinc isotopic compositions (ZnJMC-Lyon) of low-MgO (<13 wt.%) and high-MgO (>16 wt.%) eclogites from the Koidu kimberlite complex, Sierra Leone, West African Craton, help constrain the origins of cratonic eclogites. The Zn of low-MgO eclogites range from MORB-like to significantly higher values (0.21‰ to 0.75‰), and correlate inversely with Zn concentrations. Since marine carbonates are characterized by higher Zn and lower Zn concentration than basaltic rocks, the low-MgO eclogites are suggested to originate from altered oceanic crustal protoliths that underwent isotopic exchange with carbonates within the crust during subduction. Compared to low-MgO eclogites, all but one of the high-MgO eclogites also have high Zn (0.35‰ to 0.95‰), but they have lower Zn concentrations and Zn/Fe ratios, both of which are negatively correlated with MgO contents. These features point to formation of high-MgO eclogites via metasomatic overprinting of low-MgO eclogites through addition of secondary clinopyroxenes crystallized from infiltrating ultramafic melts. Thus, both low-MgO and high-MgO eclogites bear the imprint of subducted carbonate-bearing oceanic crust. Our study shows that the distinctively high-Zn signatures of marine carbonates can be retained in deeply subducted oceanic crust that may contribute to mantle sources of intraplate alkali basalts with elevated Zn and Zn/Fe. Therefore, Zn isotopes provide a viable means to trace carbonate recycling in the mantle.
DS1995-0409
1995
Haggerty, S.Deines, P., Haggerty, S.Small scale oxygen isotope variation in ultradeep (>300 KM) and transition zone xenoliths.Proceedings of the Sixth International Kimberlite Conference Extended Abstracts, p. 126-8.South AfricaGeochronology, Deposit -Jagersfontein
DS2003-0529
2003
Haggerty, S.Haggerty, S.Identification of conflict diamonds: a boulevard in creative futilityPdac Abstract 2003, March 10, 1p.GlobalNews item, Conflict diamonds
DS2003-0530
2003
Haggerty, S.Haggerty, S.In the beginning .. diamonds in IndiaPdac Abstract 2003, March 10, 1p.IndiaNews item, History
DS200712-0401
2006
Haggerty, S.Haggerty, S., Fung, A.Oribicular oxides in carbonatitic kimberlites.American Mineralogist, Vol. 91, no. 11-12, pp. 1461-1472.Africa, Namibia, Uganda, South AfricaExamples - Mukorob, Hatzium
DS200812-0224
2008
Haggerty, S.Clement, B.M., Haggerty, S., Harris, J.Magnetic inclusions in diamonds.Earth and Planetary Science Letters, Vol. 267, 1-2, pp.333-340.Africa, BotswanaOrapa - diamond inclusions
DS201112-0401
2010
Haggerty, S.Haggerty, S.Diamond dynamics: modern views through ancient windows.5th Brasilian Symposium on Diamond Geology, Nov. 6-12, abstract p. 12.MantleCore, Carbon, Methane, Subduction
DS201112-0402
2011
Haggerty, S.Haggerty, S.Kimberlites, supercontinents and deep Earth dynamics: Mid-Proterozoic India in Rodinia. ( Not much new)In: Topics in Igneous Petrology, Part 8, pp. 421-435.IndiaOverview
DS201412-0329
2014
Haggerty, S.Haggerty, S.Carbonado: physical and chemical properties, a critical evaluation of proposed origins, and a revised genetic model.Earth Science Reviews, Vol. 130, pp. 1-196.TechnologyCarbonado - review
DS201412-0330
2014
Haggerty, S.Haggerty, S.Diamond exploration in NW Liberia.GSSA Kimberley Diamond Symposium and Trade Show provisional programme, Sept. 10-12, POSTERAfrica, LiberiaExploration overview
DS201412-0331
2014
Haggerty, S.Haggerty, S.Cosmic carbonado: an origin in white dwarf stars, carbon rich exoplanets, and by late heavy bombardment.6 Simposio Brasileiro de Geologia do Diamante, Aug. 3-7, 1p. AbstractSouth America, Brazil, Bahia, Africa, Central African RepublicCarbonado
DS201412-0332
2014
Haggerty, S.Haggerty, S.Diamond exploration in NW Liberia: discovery of a new kimberlite pipe and the recognition of a diagnostic botanical indicator.6 Simposio Brasileiro de Geologia do Diamante, Aug. 3-7, 4p. AbstractAfrica, LiberiaGeobotany
DS201708-1662
2017
Haggerty, S.Haggerty, S.Relation between micro- and macro-diamonds: myth, myopia or both?11th. International Kimberlite Conference, PosterTechnologymicrodiamonds
DS1996-0580
1996
Haggerty, S. E.Haggerty, S. E.Universal diamonds...International Geological Congress 30th Session Beijing, Abstracts, Vol. 2, p. 391.GlobalNannodiamonds
DS1970-0302
1971
Haggerty, S.E.Haggerty, S.E.High Temperature Oxidation of Ilmenite in BasaltsCarnegie Institute Yearbook, FOR 1970, PP. 165-176.GlobalResearch, Origin
DS1970-0705
1973
Haggerty, S.E.Haggerty, S.E.Spinels of Unique Composition Associated with Ilmenite Reactions in the Liqhobong Kimberlite Pipe, Lesotho.Maseru: Lesotho Nat. Dev. Corp. Lesotho Kimberlites Editor N, PP. 149-158.LesothoMineralogy, Mineral Chemistry
DS1975-0094
1975
Haggerty, S.E.Haggerty, S.E.The Chemistry and Genesis of Opaque Minerals in KimberlitesPhysics and Chemistry of the Earth., Vol. 9, PP. 295-307.South AfricaMineral Chemistry, Genesis
DS1975-0343
1976
Haggerty, S.E.Merkel, G.A. , Haggerty, S.E., Boyd, F.R.A Unique Olivine Megacryst from the Monastery MineEos, Vol. 57, No. 4, P. 355. (abstract.).South AfricaPetrography
DS1975-0570
1977
Haggerty, S.E.Mcmahon, B.M., Haggerty, S.E.The Oka Carbonatite Complex: Magnetite Composition and the Role of Immiscible Silicate Liquids.International Kimberlite Conference SECOND., EXTENDED ABSTRACT VOLUME.Canada, QuebecRelated Rocks
DS1975-1048
1979
Haggerty, S.E.Haggerty, S.E.The Jagersfontein Kimberlite, South Africa: an Emporium of Exotic Mineral Reactions from the Upper Mantle.Geological Society of America (GSA), Vol. 11, No. 7, P. 437. (abstract.).South AfricaMineralogy
DS1975-1049
1979
Haggerty, S.E.Haggerty, S.E., Bence, R.J., Mcmahon, B.M.Kimberlites in Western Liberia, Iii. Mineral ChemistryKimberlite Symposium., Vol. 2, CAMBRIDGE UniversityGlobalBlank
DS1975-1050
1979
Haggerty, S.E.Haggerty, S.E., Hardie, R.B.III, Mcmahon, B.M.The Mineral Chemistry of Ilmenite Nodule Associations from The Monastery Diatreme.Proceedings of Second International Kimberlite Conference, Proceedings Vol. 2, PP. 249-256.South AfricaGeochemistry
DS1975-1147
1979
Haggerty, S.E.Mcmahon, B.M., Haggerty, S.E.The Oka Carbonatite Complex: Magnetite Composition and the Related Role of Titanium in Pyrochlore.International Kimberlite Conference SECOND., Vol. 1, PP. 382-392.Canada, QuebecRelated Rocks
DS1975-1189
1979
Haggerty, S.E.Raber, E., Haggerty, S.E.Zircon-oxide Reactions in Diamond Bearing KimberlitesProceedings of Second International Kimberlite Conference, Proceedings Vol. 1, PP. 229-240.South AfricaMineralogy
DS1975-1244
1979
Haggerty, S.E.Tollo, K.P., Haggerty, S.E.Composition and Textural Relations of Discrete Ilmenite And rutile Nodules from the Orapa Ak 1 Kimberlite Pipe, Botswana.Eos, Vol. 60, No. 18, PP. 418-419. (abstract.).BotswanaPetrography
DS1981-0199
1981
Haggerty, S.E.Haggerty, S.E., Toft, P.B., Tompkins, L.A.Diamonds in Graphitic SchistsEos, Vol. 62, No. 17, P. 416. (abstract.).GlobalGeology
DS1981-0408
1981
Haggerty, S.E.Tollo, R.P., Haggerty, S.E., Mcmahon, B.M.Ilmenite Rutile Intergrowths in Kimberlites: Mineral Chemistry, Phase Relations and Possible Implications.Eos, Vol. 62, No. 17, P. 414. (abstract.).South Africa, BotswanaJagersfontein, Orapa
DS1981-0410
1981
Haggerty, S.E.Tompkins, L.A., Haggerty, S.E.The Koidu Kimberlite, Sierra Leone: Preliminary Analytical Results.National Diamond Mining Company Sierra Leone., 28P. UNPUBL. SEPTEMBER.West Africa, Sierra LeoneChemical, Analyses, Mineral Chemistry, Ilmenite, Chlorite, Eclogite
DS1982-0238
1982
Haggerty, S.E.Haggerty, S.E.Kimberlites in Western Liberia: an Overview of the Geological Setting in a Plate Tectonic Framework #2Eos, Vol. 63, No. 45, P. 1175 (abstract.).GlobalBlank
DS1982-0239
1982
Haggerty, S.E.Haggerty, S.E.Kimberlites in Western Liberia: an Overview of the Geological Setting in a Plate Tectonic Framework #1Journal of Geophysical Research, Vol. 87, No. B 13, PP. L0, 8LL-L0, 826.GlobalBlank
DS1982-0240
1982
Haggerty, S.E.Haggerty, S.E.Magsat, Geological and Gravity Correlations in Northern South America and West Africa.Eos, Vol. 63, No. 45, P. 909. (abstract.).South Africa, United StatesMid-continent
DS1982-0241
1982
Haggerty, S.E.Haggerty, S.E.The Mineralogy of Global Magnetic Anomalies #1National Technical Information Service NASA CR 169507, 47P.West AfricaMagsat, Geophysics, Gondwanaland
DS1982-0242
1982
Haggerty, S.E.Haggerty, S.E., Toft, P.B.Magsat: Geological and Gravity Correlations in Northern South America and West Africa.Eos, Vol. 63, No. 45, Nov. 9TH., P. 909, (abstract.).South America, West AfricaGeophysics
DS1982-0243
1982
Haggerty, S.E.Haggerty, S.E., Tompkins, L.A.Opaque Mineralogy and Chemistry of Ilmenite Nodules in West africa Kimberlites: Subsolidus Equilibrium and Controls on Crystallization Trends.Proceedings of Third International Kimberlite Conference, TERRA COGNITA, ABSTRACT VOLUME., Vol. 2, No. 3, PP. 224-225, (abstract.).West Africa, Liberia, Sierra Leone, Mali, GuineaKimberlite, Heavy Minerals, Sampling
DS1982-0603
1982
Haggerty, S.E.Tompkins, L.A., Haggerty, S.E.Unique Kimberlitic Chlorites from Sierra LeoneGeological Society of America (GSA), Vol. 14, No. 7, P. 632, (abstract.).Sierra Leone, West AfricaKimberlite, Petrography
DS1982-0604
1982
Haggerty, S.E.Tompkins, L.A., Haggerty, S.E.The Koidu Kimberlite Complex, Sierra LeoneProceedings of Third International Kimberlite Conference, TERRA COGNITA, ABSTRACT VOLUME., Vol. 2, No. 3, P. 210, (abstract.).Sierra Leone, West AfricaKimberlite, Yengema, Pipe, Dike, Petrology, Mineralogy, Texture
DS1983-0269
1983
Haggerty, S.E.Haggerty, S.E.Radioactive Nuclear Waste Stabilization: Aspects of Solid State Molecular Engineering and Applied Geochemistry.Annual Review of Earth and Planetary Science, Vol. 11, PP. 133-163.GlobalMineral Chemistry, Related Rocks
DS1983-0270
1983
Haggerty, S.E.Haggerty, S.E.A Freudenbergite Related Mineral in Granulites from a Kimberlite in Liberia, West Africa.Neues Jahrbuch f?r Mineralogie, HEFT 8, PP. 375-384.GlobalMineralogy, Microprobe Analyses, Genesis
DS1983-0271
1983
Haggerty, S.E.Haggerty, S.E.The Mineral Chemistry of New Titanates from the Jagersfontein Kimberlite, South Africa: Implications for Metasomatism In the Upper Mantle.Geochimica et Cosmochimica Acta ., Vol. 47, No. 11, NOVEMBER PP. 1833-1854.South AfricaMineral Chemistry
DS1983-0272
1983
Haggerty, S.E.Haggerty, S.E.Oxide Silicate Reactions in Lower Crustal Granulites from Liberia, West Africa.Geological Society of America (GSA), Vol. 15, No. 6, P. 589. (abstract.).West Africa, LiberiaKimberlite, Genesis, Freudenbergite, Garnets, Metasomatism
DS1983-0273
1983
Haggerty, S.E.Haggerty, S.E., Mariano, A.N.Strontian Loparite and Strontio Chevkinite: Two New Minerals in Rheomorphic Fenites from the Parana Basin Carbonatites, south America.Contributions to Mineralogy and Petrology, Vol. 84, No. 4, PP. 365-381.Brazil, ParaguayRelated Rocks, Mineralogy
DS1983-0274
1983
Haggerty, S.E.Haggerty, S.E., Raber, E., Naeser, C.W.Fissure Track Dating of Kimberlitic ZirconsEarth Plan. Sci. Letters, Vol. 63, No. 1, PP. 41-50.South Africa, Botswana, Angola, Tanzania, Wyoming, State LineGeochronology, Kimberley Pool, Orapa, Val Do Queve, Koffiefontein
DS1983-0275
1983
Haggerty, S.E.Haggerty, S.E., Smyth, J.R., Erlank, A.J., Rickard, R.S., Danchi.Lindsleyite (ba) and Mathiasite (k): Two New Chromium Titanaetes in the crichtonite Series from the Upper Mantle.American MINERALOGIST., Vol. 68, PP. 494-505.South AfricaKimberlite, Rare Earth Elements (ree), Mineral Chemistry, Analyses
DS1983-0276
1983
Haggerty, S.E.Haggerty, S.E., Tompkins, L.A.Subsoildus Reactions in Kimberlitic Ilmenites: Exsolutions, reduction and the Redox State of the Mantle- Appendix.Annales Scientifiques De L' Universite De Clermont-ferrand Ii, No. 74, PP. 141-148.West Africa, Liberia, Sierra Leone, Russia, South AfricaAnalyses
DS1983-0277
1983
Haggerty, S.E.Haggerty, S.E., Tompkins, L.A.Redox State of Earth's Upper Mantle from Kimberlite IlmeniteNature., Vol. 303, No. 5915, PP. 295-300.West Africa, Liberia, United StatesMineral Chemistry
DS1983-0602
1983
Haggerty, S.E.Tompkins, L.A., Haggerty, S.E.The Koidu Kimberlite Complex, Sierra Leone: Geological Setting, Petrology and Mineral Chemistry- Appendix.Annales Scientifiques De L' Universite De Clermont-ferrand Ii, No. 74, PP. 99-122.West Africa, Sierra LeoneAnalyses, Mineral Chemistry
DS1983-0603
1983
Haggerty, S.E.Tompkins, L.A., Hargraves, R.B., Haggerty, S.E.Magnetic Mineralogy and Palaeomagnetism of the Koidu Kimberlite Complex Sierra Leone, West Africa.Eos, Vol. 64, No. 18, PP. 216-217. (abstract.).West Africa, Sierra LeoneMineral Chemistry
DS1984-0331
1984
Haggerty, S.E.Haggerty, S.E., Tompkins, L.A.Subsolidus Reactions in Kimberlitic Ilmenites: Exsolution, Reduction and the Redox State of the Mantle.Proceedings of Third International Kimberlite Conference, Vol. 1, PP. 335-357.South Africa, West Africa, Sierra Leone, LiberiaMineral Chemistry, Related Rocks
DS1984-0507
1984
Haggerty, S.E.Mcmahon, B., Haggerty, S.E.The Benfontein Kimberlite Sills: Magmatic Reactions and High Intrusion Temperatures.American Journal of Science, Vol. 284, No. 8, OCTOBER PP. 893-941.South AfricaGenesis, Petrology
DS1984-0733
1984
Haggerty, S.E.Tompkins, L.A., Bailey, S.W., Haggerty, S.E.Kimberlitic Chlorites from Sierra Leone, West Africa: Unusual Chemistries and Structural Polytypes.American Mineralogist., Vol. 69, PP. 237-249.West Africa, Sierra LeoneMineral Chemistry, Nodules
DS1984-0734
1984
Haggerty, S.E.Tompkins, L.A., Haggerty, S.E.The Koidu Kimberlite Complex, Sierra Leone: Geological Setting, Petrology and Mineral Chemistry.In: Kimberlites. I. Kimberlites And Related Rocks, Kornprobs, PP. 83-105.West Africa, Sierra LeoneDiatreme, Kimberlite, Genesis, Carbonatite, Related Rocks, Craton
DS1985-0256
1985
Haggerty, S.E.Haggerty, S.E.The Mineralogy of Global Magnetic Anomalies #2Nasa Cr 174242, 153P.West Africa, Sierra Leone, South Africa, BrazilKimberlite, Geophysics
DS1985-0257
1985
Haggerty, S.E.Haggerty, S.E., Moore, A.E., Erlank, A.J.Macrocryst Fe-ti Oxides in Olivine Melilitites from Namaqualand-bushmanland South Africa.Contributions to Mineralogy and Petrology, Vol. 91, No. 2, PP. 163-170.South AfricaPetrology
DS1985-0675
1985
Haggerty, S.E.Tompkins, L.A., Haggerty, S.E.Groundmass Oxide Minerals in the Koidu Kimberlite Dikes, Sierra Leone, West Africa.Contributions to Mineralogy and Petrology, Vol. 91, No. 3, PP. 245-263.West Africa, Sierra LeonePetrology
DS1986-0218
1986
Haggerty, S.E.Erlandk, A.J., Waters, F.G., Haggerty, S.E., Hawkesworth, C.J.Characterisation of metasomatic processes in peridotite nodules contained in kimberlitesProceedings of the Fourth International Kimberlite Conference, Held Perth, Australia, No. 16, pp. 232-234South AfricaBlank
DS1986-0219
1986
Haggerty, S.E.Erlank, A.J., Waters, F.G., Hawkesworth, C.J., Haggerty, S.E.Evidence for mantle metasomatism in peridotite nodules from the Kimberleypipes, South Africain: Menzies, M.A., Hawkesworth, C.J. editors Mantle Metasomatism, Academic, pp. 221-312South AfricaMetasomatism
DS1986-0243
1986
Haggerty, S.E.Field, S.W., Haggerty, S.E., Erlank, A.J.Subcontinental lithospheric and asthenospheric metasomatism In the region of Jagersfontein, South AfricaProceedings of the Fourth International Kimberlite Conference, Held Perth, Australia, No. 16, pp. 235-237South AfricaBlank
DS1986-0328
1986
Haggerty, S.E.Haggerty, S.E.Diamond genesis in a multiply constrained modelNature, Vol. 320, No. 6057, March 6, pp. 34-38Australia, Western Australia, Kimberley cratonLamproite
DS1986-0329
1986
Haggerty, S.E.Haggerty, S.E.Kimberlite carbonatite relations: brethern or distant cousins?Geological Association of Canada (GAC) Annual Meeting, Vol. 11, p. 76. (abstract.)GlobalGenesis, Carbonatite
DS1986-0330
1986
Haggerty, S.E.Haggerty, S.E.Metasomatic mineral titanate complexing in the upper mantleNature, Vol. 319, No. 6056, Feb. 27th, pp. 761-763South AfricaBultfontein, K-richterite
DS1986-0331
1986
Haggerty, S.E.Haggerty, S.E.Source regions for oxides, sulfides and metals in upper mantle: clues To the stability of diamonds, and the origin Of kimberlites and lamproitesProceedings of the Fourth International Kimberlite Conference, Held Perth, Australia, No. 16, pp. 250-252South Africa, AustraliaLamproite
DS1986-0399
1986
Haggerty, S.E.Jaques, A.L., Boxer, G., Lucas, H., Haggerty, S.E.Mineralogy and petrology of the Argyle lamproite pipe, WesternProceedings of the Fourth International Kimberlite Conference, Held Perth, Australia, No. 16, pp. 48-50AustraliaPetrology, Lamproite
DS1986-0540
1986
Haggerty, S.E.Mazzone, P., Haggerty, S.E.Corganites and corgaspinites. Two new types of aluminous assemblages From the Jagersfontein kimberlite pipeProceedings of the Fourth International Kimberlite Conference, Held Perth, Australia, No. 16, pp. 279-281South AfricaPetrography, Mineral chemistry
DS1986-0565
1986
Haggerty, S.E.Meyer, H.O.A., Haggerty, S.E., Svisero, D.P.Oxide and silicate minerals in the kimberlites of Minas Gerais, BrasilProceedings of the Fourth International Kimberlite Conference, Held Perth, Australia, No. 16, pp. 69-71BrazilMineral chemistry, Analyses
DS1986-0576
1986
Haggerty, S.E.Mitchell, R.H., Haggerty, S.E.A new potassium vanadium barium titanite related to priderite from the New Elands kimberliteNeues Jahrbuch f?r Mineralogie Monatsch, No. 8, pp. 376-384South AfricaLamproite
DS1986-0808
1986
Haggerty, S.E.Toft, P.B., Haggerty, S.E.A remanent and induced magnetization model of magsat vector anomalies over the West African cratonGeophysical Research Letters, Vol. 13, No. 4, April pp. 341-344West AfricaTectonics, Geophysics
DS1987-0188
1987
Haggerty, S.E.Erlank, A.J., Haggerty, S.E., Hawkesworth, C.J., Waters, F.G.Lithospheric metasomatism beneath Southern AfricaTerra Cognita, Conference abstracts Oceanic and Continental Lithosphere:, Vol. 7, No. 4, Autumn, abstract only p. 612Southern AfricaBlank
DS1987-0267
1987
Haggerty, S.E.Haggerty, S.E.Metasomatic mineral titanates in upper mantle xenolithsin: Nixon, P.H. ed. Mantle xenoliths, J. Wiley, pp. 671-690South AfricaAnalyses p.674 LIMA minerals, p. 679 armacolites p. 68
DS1987-0268
1987
Haggerty, S.E.Haggerty, S.E., Erlank, A.J.Lithospheric redox statesTerra Cognita, Conference abstracts Oceanic and Continental Lithosphere:, Vol. 7, No. 4, Autumn, abstract only p. 614GlobalBlank
DS1987-0269
1987
Haggerty, S.E.Haggerty, S.E., Field, S.Rift induced diamond diatremes in the Arabian plate, northwest SyriaEos, Vol. 68, No. 44, November 3, p. 1533. Abstract onlySyriaTectonics
DS1987-0449
1987
Haggerty, S.E.Mazzone, P., McLanahan, A., Haggerty, S.E.Clinopyroxene megacrysts from the Jagersfontein kimberlite pipeEos, abstractSouth AfricaPetrology
DS1987-0742
1987
Haggerty, S.E.Tollo, R.P., Haggerty, S.E.Niobium, chromium rutile in the Orapa kimberlite BotswanaCanadian Mineralogist, Vol. 25, pp. 251-264BotswanaMineralogy, Nodules
DS1988-0702
1988
Haggerty, S.E.Toft, P.B., Haggerty, S.E.Limiting depth of magnetization in cratonic lithosphereGeophysical Research Letters, Vol. 15, No. 5, May pp. 530-533West AfricaBlank
DS1989-0420
1989
Haggerty, S.E.Field, S.W., Haggerty, S.E., Erlank, A.J.Subcontinental metasomatism in the region ofJagersfontein, SouthAfricaGeological Society of Australia Inc. Blackwell Scientific Publishing, Special, No. 14, Vol. 2, pp. 771-783South AfricaMantle Metasomatism
DS1989-0566
1989
Haggerty, S.E.Haggerty, S.E.Mantle metasomes and the kinship between carbonatites and kimberlitesCarbonatites -Genesis and Evolution, Ed. K. Bell Unwin Hyman Publ, pp. 546-560GlobalMantle Metasomatism, Carbonatite-kimberlites
DS1989-0567
1989
Haggerty, S.E.Haggerty, S.E.Upper mantle oxidation state and diamond genesisDiamond Workshop, International Geological Congress, July 15-16th. editors, pp. 26-28GlobalMantle, Diamond genesis
DS1989-0568
1989
Haggerty, S.E.Haggerty, S.E.Upper mantle opaque mineral stratigraphy and the genesis of metasomites and alkali-rich meltsGeological Society of Australia Inc. Blackwell Scientific Publishing, Special, No. 14, Vol. 2, pp. 687-699South Africa, China, AustraliaMantle Metasomatism
DS1989-0641
1989
Haggerty, S.E.Hills, D.V., Haggerty, S.E.Petrochemistry of eclogites from the Koidu kimberliteComplex, SierraLeoneContributions to Mineralogy and Petrology, Vol. 103, No. 4, pp. 397-422Sierra LeonePetrochemistry, Eclogites
DS1989-0704
1989
Haggerty, S.E.Jaques, A.L., Haggerty, S.E., Lucas, H., Boxer, G.L.Mineralogy and petrology of the Argyle (AK1) lamproite pipe, westernAustraliaGeological Society of Australia Inc. Blackwell Scientific Publishing, Special, No. 14, Vol. 1, pp. 153-169AustraliaDeposit -Argyle, Lamproite
DS1989-0964
1989
Haggerty, S.E.Mazzone, P., Haggerty, S.E.Peraluminous xenoliths in kimberlite: metamorphosed restites produced by partial melting of pelitesGeochimica et Cosmochimica Acta, Vol. 53, pp. 1551-1561South AfricaJagersfontein, Xenoliths
DS1989-0965
1989
Haggerty, S.E.Mazzone, P., Haggerty, S.E.Corganites and coraspinites: two new types of aluminous assemblages From the Jagersfontein kimberlite pipeGeological Society of Australia Inc. Blackwell Scientific Publishing, Special, No. 14, Vol. 2, pp. 795-808South AfricaXenoliths, Mineral chemistry
DS1989-1503
1989
Haggerty, S.E.Toft, P.B., Hills, D.V., Haggerty, S.E.Crustal evolution and the granulite to eclogite transition in xenoliths from kimberlites in the West African cratonTectonophysics, Vol. 161, No. 3/4, pp. 213-231GlobalEclogite
DS1990-0629
1990
Haggerty, S.E.Haggerty, S.E.Upper mantle metasomatism: exotic oxides in harzburgite and diamonds ineclogiteInternational Mineralogical Association Meeting Held June, 1990 Beijing China, Vol. 2, extended abstract p. 802-803GlobalMantle metasomatism -harzbugite, Diamond genesis
DS1990-0630
1990
Haggerty, S.E.Haggerty, S.E.Omphacite exsolution in garnet: evidence for ultra deep samples from The upper mantle in the Jagersfontein kimberlite, South AfricaInternational Mineralogical Association Meeting Held June, 1990 Beijing China, Vol. 2, extended abstract p. 803-805South AfricaMineralogy -garnet, Jagersfontein
DS1990-0631
1990
Haggerty, S.E.Haggerty, S.E., Hargraves, R.B., Tompkins, L.A.Oxide mineralogy and magmatic properties of the Koidukimberlite Sierra Leone, West-AfricaGeophysical Journal, I, Vol. 100, No. 2, February pp. 275-Sierra LeoneGarnet analsyses -Mineralogy, Koidu Complex
DS1990-0632
1990
Haggerty, S.E.Haggerty, S.E., Sautter, V.Ultradeep (greater than 300 kilometers) ultramafic upper mantle xenolithsScience, Vol. 248, No. 4958, May 25, pp. 993-996GlobalMantle, Xenoliths
DS1990-0633
1990
Haggerty, S.E.Haggerty, S.E., Sautter, V.Ultra deep ( >300km) garnet clinopyroxene xenoliths in diamondiferouskimberlitesEos, Vol. 71, No. 17, April 24, p. 523 Abstract onlySouth AfricaJagersfontein, Garnet analyses
DS1990-0700
1990
Haggerty, S.E.Hills, D.V., Haggerty, S.E.Eclogites from Koidu kimberlite Complex, Sierra Leone,lithospheric and ultra deep asthenospheric originsEos, Vol. 71, No. 17, April 24, p. 523 Poster Abstract onlySierra LeoneKoidu, Eclogites
DS1990-1421
1990
Haggerty, S.E.Stolz, J.F., Lovley, D.R., Haggerty, S.E.Biogenic magnetite and the magnetization of sedimentsJournal of Geophysical Research, Vol. 95, No. B 4, April 10, pp. 4355-4362GlobalBiogenic magnetite, Sediments
DS1991-0642
1991
Haggerty, S.E.Haggerty, S.E.Oxide mineralogy of the upper mantleReviews in Mineralogy, Vol. 25, Chapter 10, pp. 355-416GlobalOxide mineralogy, Kimberlites, lamproites
DS1991-0643
1991
Haggerty, S.E.Haggerty, S.E.Oxide textures -a mini-atlasReviews in Mineralogy, Vol. 25, Chapter 5, pp. 129-220GlobalOxide mineralogy, Textures
DS1991-0644
1991
Haggerty, S.E.Haggerty, S.E.Emplacement and implications of ultra-deep xenoliths and diamonds from the transition zoneProceedings of Fifth International Kimberlite Conference held Araxa June 1991, Servico Geologico do Brasil (CPRM) Special, pp. 157-159South AfricaPlumes, Mantle, genesis, tectonics
DS1991-1504
1991
Haggerty, S.E.Sautter, V., Haggerty, S.E.Ultra-deep (> 300km),ultramafic xenoliths: direct petrological evidence for the transition zoneProceedings of Fifth International Kimberlite Conference held Araxa June 1991, Servico Geologico do Brasil (CPRM) Special, pp. 347-349South AfricaXenoliths, Jagersfontein, petrology
DS1991-1505
1991
Haggerty, S.E.Sautter, V., Haggerty, S.E., Field, S.Ultradeep (> 300 kilometers) ultramafic xenoliths: petrological evidence from the transition zoneScience, Vol. 252, No. 5007, May 10, pp. 827-830South Africa, BrazilXenoliths, Majorite/spinel, seismic gradient, geophysics
DS1992-0460
1992
Haggerty, S.E.Field, S.W., Haggerty, S.E., Field, J.E., Green, J.M.Symplectities in peridotites and the growth of garnet in the upper mantleEos Transactions, Vol. 73, No. 14, April 7, supplement abstracts p.336South Africa, MantlePeridotite, Harzburgite
DS1992-0500
1992
Haggerty, S.E.Fung, A.T., Haggerty, S.E.high pressure magmatic eclogites, Koidu, Sierra LeoneEos Transactions, Vol. 73, No. 14, April 7, supplement abstracts p.325Sierra LeoneEclogites, Kimberlite pipe 1
DS1992-0644
1992
Haggerty, S.E.Haggerty, S.E.Models for the origin of diamonds, kimberlites and lamproites: relevance To diamond explorationInternational Roundtable Conference on Diamond Exploration and Mining, held, 1p. abstract onlyGlobalKimberlite, lamproite, Diamond genesis, model
DS1992-0645
1992
Haggerty, S.E.Haggerty, S.E.Magnetomineralogy and sources of MAGSAT anomalies at subduction zonesEos Transactions, Vol. 73, No. 14, April 7, supplement abstracts p. 90MantleGeophysics -magnetics, MAGSAT.
DS1992-0646
1992
Haggerty, S.E.Haggerty, S.E.Superplumes, superchrons and superkimberlitesEos Transactions, Vol. 73, No. 14, April 7, supplement abstracts p.325MantleKimberlites, Superplumes
DS1992-0647
1992
Haggerty, S.E.Haggerty, S.E.Diamonds in West Africa: tectonic setting and kimberlite productivityRussian Geology and Geophysics, Vol. 33, No. 10, pp. 35-49West AfricaTectonics, Kimberlites
DS1992-1241
1992
Haggerty, S.E.Pyle, J.M., Haggerty, S.E.Metasomatism of upper mantle eclogites, Jagersfontein kimberlite, SouthAfricaEos Transactions, Vol. 73, No. 14, April 7, supplement abstracts p.324-5South AfricaEclogites, Metasomatism
DS1992-1557
1992
Haggerty, S.E.Toft, P.B., Taylor, P.T., Arkanantha..., J., Haggerty, S.E.Interpretation of satellite magnetic-anomalies over the West Africancraton.Tectonophysics, Vol. 212, No. 1-2, Oct. 1, pp. 21-32.West AfricaGeophysics -magnetics, remote sensing, Craton
DS1993-0472
1993
Haggerty, S.E.Fung, A.T., Haggerty, S.E.Zoning, melting and apatite in mantle eclogites, Koidu, Sierra LeoneEos, Transactions, American Geophysical Union, Vol. 74, No. 16, April 20, supplement abstract p. 320Sierra LeonePetrography, Mineral chemistry
DS1993-0610
1993
Haggerty, S.E.Haggerty, S.E., Fung, A.T., Pyle, J.M.The mantle array and geochemistries of high pressure and high temperatureeclogites.Russian Geology and Geophysics, Vol. 34, No. 12, pp. 51-65.GlobalGeochemistry, Craton, Koidu, Jagersfontein, Eclogites
DS1993-1272
1993
Haggerty, S.E.Pyle, J.M., Haggerty, S.E.Silicate-carbonate liquid immiscibility in upper mantle eclogites, Jagersfontein, kimberlite South Africa.Eos, Transactions, American Geophysical Union, Vol. 74, No. 16, April 20, supplement abstract p. 320.South AfricaPetrography, Mineral chemistry, microprobe
DS1993-1677
1993
Haggerty, S.E.Vlassopoulos, D., Rossman, G.R., Haggerty, S.E.Coupled substitution of Hydrogen and minor elements in rutile and the implications of high OH contents in niobium and chromium rich rutile from the upper mantle.American Mineralogist, Vol. 78, No. 11, 12, November-December pp. 1181-1191.South Africa, Tennessee, GeorgiaMantle geochemistry, Infrared absorption spectra, spectrometry
DS1994-0520
1994
Haggerty, S.E.Field, S.W., Haggerty, S.E.Symplectities in upper mantle peridotites: development and implications For the growth of subsolidus garnet.Contributions to Mineralogy and Petrology, Vol. 118, pp. 138-156.South AfricaPetrology -experimental, Deposit -Jagersfontein
DS1994-0692
1994
Haggerty, S.E.Haggerty, S.E.Superkimberlites: a geodynamic diamond window in the earth's coreEarth and Planet. Science Letters, Vol. 122, No. 1/2, March pp. 57-70.MantleKimberlites, Superkimberlites
DS1994-0693
1994
Haggerty, S.E.Haggerty, S.E.Upper mantle mineralogy #1International Symposium Upper Mantle, Aug. 14-19, 1994, pp. 33-84.MantleMineralogy of kimberlites, lamproites, Review -upper mantle mineralogy
DS1994-0694
1994
Haggerty, S.E.Haggerty, S.E.Deep upper mantle and transition zone xenoliths in the Jagersfonteinkimberlite, Kaapvaal craton.Eos, Vol. 75, No. 16, April 19, p. 192.South AfricaXenoliths, Deposit -Jagersfontein
DS1994-0695
1994
Haggerty, S.E.Haggerty, S.E., Fung, A.T.Orbicular oxide in mantle carbonates: high pressure autoliths or low pressure liquid immiscibility?Eos, Vol. 75, No. 16, April 19, p. 187.MantleCarbonates
DS1994-0696
1994
Haggerty, S.E.Haggerty, S.E., Fung, A.T., Burt, D.M.Apatite, phosphorous and titanium in eclogitic garnet from the uppermantle.Geophysical Research Letters, Vol. 21, No. 16, Aug. 1, pp. 1699-1702.MantleEclogites
DS1994-1347
1994
Haggerty, S.E.Pearson, D.G., Boyd, F.R., Haggerty, S.E., Pasteris, J.D.The characterization and origin of graphite in cratonic lithosphericmantle: a petrological carbon isotope and Raman spectroscopic study.Contr. Mineralogy and Petrology, Vol. 116, No. 3, pp. 449-466.MantleGeochronology, Graphite
DS1994-1418
1994
Haggerty, S.E.Pyle, J.M., Haggerty, S.E.Silicate-carbonate liquid immiscibility in upper mantle eclogites-implications for natrosilicic ,carbonatitesGeochimica et Cosmochimica Acta, Vol. 58, No. 14. July, pp. 2997-3011.GlobalCarbonatite, Eclogite
DS1994-1751
1994
Haggerty, S.E.Taylor, W.R., Tompkins, L.A., Haggerty, S.E.Comparative geochem. of West African kimberlites: evidence micaceous kimberlite endmember sublithosphericGeochimica et Cosmochimica Acta, Vol. 58, 19, pp. 4017-37.GlobalGeochemistry, Deposit -Koidu
DS1994-1752
1994
Haggerty, S.E.Taylor, W.R., Tompkins, L.A., Haggerty, S.E.Comparative geochemistry of West African kimberlites: evidence for amicaceous kimberlite endmember sublith.Geochimica et Cosmochimica Acta, Vol. 58, No. 19, pp. 4017-4037.West Africa, Sierra LeoneGeochemistry, Kimberlites -micaceous
DS1995-0572
1995
Haggerty, S.E.Fung, A.T., Haggerty, S.E.Petrography and mineral compositions of eclogites from the Koidu kimberlitecomplex, Sierra Leone.Journal of Geophysical Research, Vol. 100, No. 10, Oct, 10, pp. 451-474.Sierra LeonePetrography, Deposit -Koidu
DS1995-0714
1995
Haggerty, S.E.Haggerty, S.E.Carbonado, clathrate and cavitation: a model for the acoustic induction ofdiamond.Proceedings of the Sixth International Kimberlite Conference Extended Abstracts, p. 217-19.Brazil, Central African RepublicCarbonado, Seigio
DS1995-0715
1995
Haggerty, S.E.Haggerty, S.E.Ice to diamond: a model for the sonochemical transformation of clathrate tocarbonado.Eos, Abstracts, Vol. 76, No. 17, Apr 25, p. S 153.Central African Republic, BrazilCarbonado, Mineralogy
DS1995-0716
1995
Haggerty, S.E.Haggerty, S.E.Dynamic diamonds: megaplumes and superkimberlitesProspectors and Developers Association of Canada (PDAC) Annual Meeting, p. 57-8. abstractGlobalMegaplumes, Kimberlites
DS1995-0717
1995
Haggerty, S.E.Haggerty, S.E.Upper mantle mineralogy #2Journal of Geodynamics, Vol. 20, No. 4, Dec. pp. 331-364.MantleMineralogy, Review
DS1995-0718
1995
Haggerty, S.E.Haggerty, S.E.Petrochemistry of ultradeep (>300 KM) and transition zone xenolithsProceedings of the Sixth International Kimberlite Conference Extended Abstracts, p. 214-16.South AfricaPetrochemistry, Deposit -Jagersfontein Craton -Kaapvaal
DS1998-0554
1998
Haggerty, S.E.Haggerty, S.E.Diamonds in space and timeIma 17th. Abstract Vol., p. A12. abstractGlobalPresolar, impact, crustal, mantle
DS1998-0555
1998
Haggerty, S.E.Haggerty, S.E., Fung, A.T.Orbicular oxides in carbonatitic kimberlites: high pressure autoliths or low pressure liquid immiscibility?7th International Kimberlite Conference Abstract, pp. 293-5.South AfricaCarbonatite, Deposit - Mukurob, HatziuM.
DS1998-1198
1998
Haggerty, S.E.Pyle, J.M., Haggerty, S.E.Eclogites and the metasomatism of eclogites from the Jagersfonteinkimberlite: punctuated transport...Geochimica et Cosmochimica Acta, Vol. 62, No. 7, Apr. pp. 1207-1232.South AfricaAlkaline magmatism, Deposit - Jagersfontein
DS1999-0431
1999
Haggerty, S.E.Macdougall, J.D., Haggerty, S.E.Ultradeep xenoliths from African kimberlites: Strontium and neodymium isotopic compositions suggest complex history.Earth and Planetary Science Letters, Vol. 170, No. 1-2, June 30, pp. 73-82.South Africa, Africa, Liberia, Sierra LeoneGeochronology
DS2001-0088
2001
Haggerty, S.E.Barth, M.G., Rudnick, R.L., Haggerty, S.E.Geochemistry of xenolithic eclogites from West Africa: pt. 1. a link between MgO eclogites and Archean crust..Geochimica et Cosmochimica Acta, Vol. 65, No. 9, May 1, pp. 1499-West AfricaGeochemistry - eclogites
DS2002-0629
2002
Haggerty, S.E.Haggerty, S.E.The geopolitical setting of conflict diamondsEos, American Geophysical Union, Spring Abstract Volume, Vol.83,19, 1p.Angola, Sierra Leone, Central African Republic, LiberiaDiamonds - conflict
DS2002-1221
2002
Haggerty, S.E.Parthasarathy, G., Chetty, T.R.K., Haggerty, S.E.Thermal stability and spectroscopic studies of zemkorite: a carbonate from the Venkatampalle kimberlite of southern India.American Mineralogist, Vol. 87, pp. 1384-89.India, Andhra PradeshKimberlite - mineralogy, Deposit - Venkatampalle
DS2002-1222
2002
Haggerty, S.E.Parthasarthy, G., Chetty, T.R.K., Haggerty, S.E.Thermal stability and spectroscopic studies of zemkorite: a carbonate from the Venkatampalle kimberlite of southern India.American Mineralogist, Vol.87, pp. 1384-89.Indiamineralogy, Deposit - Venkatamapalle
DS2003-0531
2003
Haggerty, S.E.Haggerty, S.E.India: geological setting and petrochemistry of kimberlite clan rocks in the Dharwar8 Ikc Www.venuewest.com/8ikc/program.htm, Session 7, AbstractIndiaKimberlite petrogenesis
DS2003-0867
2003
Haggerty, S.E.Mainkar, D., Lehmann, B., Haggerty, S.E.Discovery of the very large crater facies kimberlite system of Tokapal, Bastar District8ikc, Www.venuewest.com/8ikc/program.htm, Session 1 POSTER abstractIndiaKimberlite geology and economics, Deposit - Tokapal
DS200412-0761
2003
Haggerty, S.E.Haggerty, S.E.India: geological setting and petrochemistry of kimberlite clan rocks in the Dharwar craton.8 IKC Program, Session 7, AbstractIndiaKimberlite petrogenesis
DS200612-0520
2005
Haggerty, S.E.Haggerty, S.E.Kimberlite clan rocks in India: significance of new volcanological, geochemical and petrological (VGP) observations.Geological Society of India, Bangalore November Meeting Group Discussion on Kimberlites and Related Rocks India, Abstract p. 8-9.IndiaClassification
DS200712-0348
2006
Haggerty, S.E.Garai, J., Haggerty, S.E., Rekhi, S., Chance, M.Infrared absorption investigations confirm the extraterrestrial origin of carbonado diamonds.The Astrophysical Journal, Vol. 653, Dec. 20, pp. L153-L156.TechnologyCarbonado diamonds
DS200812-0440
2008
Haggerty, S.E.Haggerty, S.E.Carbonatitic metasomatism & liquid immiscibility: a Bell ( Keith) ringer's resolve to mantle solutions.Goldschmidt Conference 2008, Abstract p.A341.MantleCarbonatite
DS200912-0243
2009
Haggerty, S.E.Garat, J., Haggerty, S.E., Rekhi, S., Chance, M.Infrared absorption investigations confirm the extraterrestrial origin of carbonado diamonds.The Astrophysical Journal, Vol. 653, L153-156.Africa, Central African Republic, South America, BrazilCarbonado
DS201312-0840
2013
Haggerty, S.E.Smith, C.B., Haggerty, S.E., Chatterjee, B., Beard, A., Townend, R.Kimberlite, lamproite, ultramafic lamprophyre, and carbonatite relationships on the Dharwar Craton, India: an example from the Khaderpet pipe, a Diamondiferous ultramafic with associated carbonatite intrusion.Lithos, Vol. 182-183, pp. 102-113.IndiaDeposit - Khaderpet
DS201312-0841
2013
Haggerty, S.E.Smith, C.B., Haggerty, S.E., Chatterjee, B., Beard, A., Townend, R.Kimberlite, lamproite, ultramafic lamprophyre, carbonatite relationships on the Dharwar Craton, India; and example from the Khaderpet pipe, a Diamondiferous ultramafic with associated carbonatite intrusion.Lithos, Vol. 182-183, pp. 102-113.IndiaDeposit - Khaderpet
DS201412-0333
1999
Haggerty, S.E.Haggerty, S.E.Diamond formation and kimberlite-clan magmatism in cratonic settings.Geochemical Society Special Publication No. 6, Mantle Petrology, No. 6, pp.MantleMagmatism
DS201602-0208
2016
Haggerty, S.E.Haggerty, S.E.Spinel in planetary systems.American Mineralogist, Vol. 101, pp. 5-6.TechnologySpinel terminology

Abstract: Spinel is ubiquitous as a rock-forming mineral in terrestrial, lunar, and planetary basalts and closely associated meteoritic equivalents. A major unknown is whether these rocks formed under similar conditions of partial melting of primary or modified mantle, whether redox environments played a role in evolutionary trends, and did mineral crystal chemistry have any influence on elemental partition between solids and liquids? In a novel approach by Papike et al. (2015), spinel is used as an informative, albeit complex indicator of oxygen fugacity, site occupancy of multiple valence elements, and spinel structural types. Planetary basalts may be reduced (IW-3), oxidized (Earth at FMQ), or of intermediate redox state (Mars). Taking an expansive view, the spinel approach holds enormous promise in understanding the magmatic differentiation of asteroids.
DS201609-1716
2016
Haggerty, S.E.De Wit, M., Bhebhe, Z., Davidson, J., Haggerty, S.E., Hundt, P., Jacob, J., Lynn, M., Marshall, T.R., Skinner, C., Smithson, K., Stiefenhofer, J., Robert, M., Revitt, A., Spaggiari, R., Ward, J.Overview of diamonds resources in Africa.Episodes, Vol. 9, 2, pp. 198-238.AfricaDiamond resources - overview

Abstract: From the discovery of diamonds in South Africa in 1866 until the end of 2013, Africa is estimated to have produced almost 3.2 Bct out of a total global production of 5.03 Bct, or 63.6% of all diamonds that have ever been mined. In 2013 African countries ranked 2nd (Botswana), 3rd (DRC), 6th (Zimbabwe), 7th (Angola), 8th (South Africa), and 9th (Namibia), in terms of carat production and 1st (Botswana), 4th (Namibia), 5th (Angola), 6th (South Africa), 7th (Zimbabwe), and 9th (DRC), in terms of value of the diamonds produced. In 2013 Africa produced 70.6 Mct out of a global total of 130.5 Mct or 54.1%, which was valued at US$ 8.7 billion representing 61.5% of the global value of US$ 14.1 billion.
DS201701-0013
2016
Haggerty, S.E.Haggerty, S.E.Kimberlite discoveries in NW Liberia: tropical exploration & preliminary results.Journal of Geochemical Exploration, Vol. 173, pp. 99-109.Africa, LiberiaKimberlite

Abstract: This report is brief in context and rich in unexpected discovery. With > 2 km of erosion, kimberlite models predict the near-complete removal of pipes with exposures to the pipe-root-zones of dikes. Exploration in NW Liberia has, indeed, uncovered eight kimberlite dikes (~ 10 m wide) but also an en echelon pipe, comparable in size to the Kimberley pipe and De Beers' pipe in South Africa. Discoveries are in a narrow 200-300 m wide valley of extraordinary thick bush, undergrowth, and organic overburden. Ilmenite and co-existing leucoxene were used as diagnostic tracers for detecting hard rock kimberlite in this tropical terrane. Micro-diamonds show that the redox state of ilmenite is a potentially useful proxy as an index for macro-diamond preservation. The tectonic control of kimberlites is complex, with diverse lithologies. Discoveries include a well-defined regional trend for kimberlite dikes along paleo-fracture zones, Precambrian in age (Liberia Trend), coupled with kimberlite dikes on the craton that are traced to Mesozoic oceanic transform faults (the Sierra Leone Trend). Although long predicted, this is the first report of kimberlite dike-trends in Liberia that are similar in orientation to those in Sierra Leone. An explosive blow on a Liberia-Trend dike demonstrates a similarity to the dynamics attendant in rich (50-500 cpht) diamond-bearing dikes in Sierra Leone, and in South Africa of comparable age. The potentially high grade dikes, along with the pipe (~ 500 × 50 m), now more reasonably accounts for the enormous number of alluvial diamonds (blood and non-conflict), recovered over more than seven decades, downstream from the discovery cluster. A neglected region since the classic work by Bardet (1974), and with few contributions on Liberia since then, an update is considered timely, particularly in the context of discoveries of diamond-bearing kimberlite.
DS201709-1995
2017
Haggerty, S.E.Haggerty, S.E.Carbonado Diamond: a review of properties and origin.Gems & Gemology, Vol. 53, 2, summer, pp. 180-188.South America, Brazil, Africa, Central African Republiccarbonado

Abstract: Carbonado diamond is found only in Brazil and the Central African Republic. These unusual diamond aggregates are strongly bonded and porous, with melt-like glassy patinas unlike any conventional diamond from kimberlites-lamproites, crustal collisional settings, or meteorite impact. Nearly two centuries after carbonado's discovery, a primary host rock compatible with the origin of conventional diamond at high temperatures and pressures has yet to be identified. Models for its genesis are far-reaching and range from terrestrial subduction to cosmic sources. Copyright of Gems & Gemology is the property of Gemological Institute of America and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.
DS201711-2515
2017
Haggerty, S.E.Haggerty, S.E.Majorite-indicative ultradeep (>300km) xenoliths with spinel associations from the Jagersfontein kimberlite, South Africa.South African Journal of Geology, Vol. 120, 1, pp. 1-20.Africa, South Africadeposit - Jagersfontein

Abstract: Our earlier studies continued in a diligent search for rare ultradeep xenoliths in the kimberlite diatreme at Jagersfontein. The search has met with moderate success insofar as 20 majorite-bearing (decomposed to *gt + lamellar px) xenoliths are identified. Discrete gts (1 to 2 cm), gt-rich layers (2 to 3 cm) in lherzolites, and rare megacrystic gts (>3 cm) from xenoliths characterize the ultradeep suite. Pyroxene lamellae are crystallographically controlled along {111} gt planes, but px may also be prismatic, lensoidal, coarsely graphic, or annular to gt; jigsaw, rather than 120° dihedral textures, are typical. Gt ranges from Pyr68-74 mole% and CaO - Cr2O3 relations, with two exceptions, are distinctly lherzolitic. Cpx37-46 = Wo mole%, Jd 3-19 mole%, with 0.4 to 2.4 wt% Cr2O3; opx = 92 to 95 mole% en, and ol averages 92.5 mole% with maximum wt% 0.1 CaO, 0.4 NiO, and 0.1 Cr2 O3. A new class of 10 ultradeep xenoliths has lamellar spinel (Cr/Cr + Al = 0.74; Mg/Mg + Fe = 0.58) in addition to cpx with gt >3wt% Cr2O3 (c.f. 0.5 to 1.5 for sp-free types). Five samples are texturally linked but are compositional outliers to the central body of data: two are sp hosts (Cr# 0.69, Mg# 0.76) and (Cr# 0.74, Mg# 0.57) to gt (Pyr72) + cpx (Jd14); one is a gt megacryst (Pyr80) with sp (Cr# 57, Mg# 69); and the remaining two are unusually rich in chromium with gt = 7.3 to 8.2 wt% Cr2O3, rimmed by cpx (2.3 to 3.3 wt% Cr2O3). In addition, there are 17 xenoliths with compositional affinities to the ultradeep suite but lacking the texturally diagnostic lamellar intergrowths of cpx in gt are possibly completely equilibrated to gt + irregular cpx. Results from the new collection substantiate our earlier conclusions that the mantle was sampled by the Jagersfontein kimberlite from the lower lithosphere (250 to 350 km) and the transition zone (435 km) with diagnostic high P-T majorite in lherzolite that decomposed to gt + px at one or more interruptive stations (e.g. lithosphere-asthenosphere boundary), and at one or another time, en route to the surface. Homogeneous majorite occurs as diamond inclusions at Jagersfontein but these are eclogitic, leading to the proposition that the source region in the asthenosphere was an unassimilated mixture of lherzolite and eclogite in the Mid-Cretaceous at the time of kimberlite sampling. Important questions arise: Is majorite primordial; did majorite form exclusively from the transition of pyroxene; or did subsequent dissolution into coexisting garnet take place? Why has majorite not been identified in eclogite, nor diamonds of lherzolitic affinity? Does the formation of majorite and the crystallization of encapsulating diamond imply distinct high P-T events?
DS201804-0698
2017
Haggerty, S.E.Haggerty, S.E.Majorite-indicative ultradeep ( >300 km) xenoliths with spinel associations from the Jagersfontein kimberlite, South Africa.South African Journal of Geology, Vol. 120, 1, pp. 1-20.Africa, South Africadeposit - Jagersfontein

Abstract: Our earlier studies continued in a diligent search for rare ultradeep xenoliths in the kimberlite diatreme at Jagersfontein. The search has met with moderate success insofar as 20 majorite-bearing (decomposed to *gt + lamellar px) xenoliths are identified. Discrete gts (1 to 2 cm), gt-rich layers (2 to 3 cm) in lherzolites, and rare megacrystic gts (>3 cm) from xenoliths characterize the ultradeep suite. Pyroxene lamellae are crystallographically controlled along {111} gt planes, but px may also be prismatic, lensoidal, coarsely graphic, or annular to gt; jigsaw, rather than 120° dihedral textures, are typical. Gt ranges from Pyr68-74 mole% and CaO - Cr2O3 relations, with two exceptions, are distinctly lherzolitic. Cpx = Wo37-46 mole%, Jd3-19 mole%, with 0.4 to 2.4 wt% Cr2O3; opx = 92 to 95 mole% en, and ol averages 92.5 mole% with maximum wt% 0.1 CaO, 0.4 NiO, and 0.1 Cr2O3. A new class of 10 ultradeep xenoliths has lamellar spinel (Cr/Cr + Al = 0.74; Mg/Mg + Fe = 0.58) in addition to cpx with gt >3wt% Cr2O3 (c.f. 0.5 to 1.5 for sp-free types). Five samples are texturally linked but are compositional outliers to the central body of data: two are sp hosts (Cr# 0.69, Mg# 0.76) and (Cr# 0.74, Mg# 0.57) to gt (Pyr72) + cpx (Jd14); one is a gt megacryst (Pyr80) with sp (Cr# 57, Mg# 69); and the remaining two are unusually rich in chromium with gt = 7.3 to 8.2 wt% Cr2O3, rimmed by cpx (2.3 to 3-3 wt% Cr2O3). In addition, there are 17 xenoliths with compositional affinities to the ultradeep suite but lacking the texturally diagnostic lamellar intergrowths of cpx in gt are possibly completely equilibrated to gt + irregular cpx. Results from the new collection substantiate our earlier conclusions that the mantle was sampled by thejagersfontein kimberlite from the lower lithosphere (250 to 350 km) and the transition zone (435 km) with diagnostic high P-T majorite in lherzolite that decomposed to gt + px at one or more interruptive stations (e.g. lithosphere-asthenosphere boundary), and at one or another time, en route to the surface. Homogeneous majorite occurs as diamond inclusions at Jagersfontein but these are eclogitic, leading to the proposition that the source region in the asthenosphere was an unassimilated mixture of lherzolite and eclogite in the Mid-Cretaceous at the time of kimberlite sampling. Important questions arise: Is majorite primordial; did majorite form exclusively from the transition of pyroxene; or did subsequent dissolution into coexisting garnet take place? Why has majorite not been identified in eclogite, nor diamonds of lherzolitic affinity? Does the formation of majorite and the crystallization of encapsulating diamond imply distinct high P-T events?
DS201905-1039
2019
Haggerty, S.E.Haggerty, S.E.Micro-diamonds: proposed origins, crystal growth laws, and the underlying principle governing resource predictions.Geochimica et Cosmochimica Acta, in press available, 43p.Globalmicrodiamonds

Abstract: The origin of micro-diamonds is controversial and although the application to determine the grade and value of macro-diamonds in kimberlite/lamproite bodies continues to receive widespread usage there are several outstanding factors generally not considered, the most important of which is genesis. The issue is addressed in this study in the context that two classes of small diamonds (generally <0.5?mm and rarely <1?mm) are recognized. Micro-diamonds sensu-stricto (MDS) are typically sharp-edged octahedra, free of mineral inclusions and surface etching or corrosion, increase exponentially with decreasing size and are in overwhelming larger concentrations, by orders of magnitude, relative to macro-diamonds (>0.5?mm). The second class of small diamonds (SD <0.5?mm), used in industrial applications, may have modified solution-growth morphologies (e.g. dodecahedra, tetrahexahedra and related forms), and include loosely bonded polycrystalline diamonds (framesite), boart, fibrous cubes and broken fragments. There are large differences in volume to surface-area ratios between MDS and SD, demonstrating unequivocally that pristine and solution-modified forms could not have co-existed in equilibrium under the same P-T-t-fO2 conditions in the mantle. From detailed studies of N and C in diamond, and experimental results on the redox-partitioning of N in the presence of metallic Fe, it is concluded that MDS are plume-related from the D? core-mantle boundary, and are melt-derived in lower mantle proto-kimberlite. The lower mantle is expectedly saturated in metallic Fe, and is highly depleted in N which is siderophile under very low f O2 conditions, a setting in which excessively large (?100 to 3000 ct), but rare Type II mega-diamonds (but also MDS) are inferred to have originated. These diamonds (Type II, Ib, IaA) are distinct from the majority of N-rich Type Ia upper mantle macro-diamonds that grew slowly by metasomatic processes and annealed over long periods. Two crystal growth laws are possibly applicable to the size-distribution of diamonds encountered in kimberlites/lamproites. Gibrat’s Law of proportionate, short-term crystal growth in open systems by advection is applicable to magmatic MDS, whereas macro-diamonds bear some relation to McCabe’s Law of long-term, relatively constant crystal growth, by diffusion metasomatism. The range from small to large diamonds (SFD size-frequency-distribution) is lognormal but is composed of two segments: the smaller size (<0.5?mm) fraction has an overall linear distribution, whereas macro-diamonds (>0.5?mm) are quadratic. The two distributions meet or overlap in a marked discontinuity, implying but not proving distinct origins. The power law governing SFD lognormal distributions is fundamental and is widespread across an enormous number of disciplines (from biology to economics), and may be universal (e.g. it is applicable to planetary scale meteorite impact craters, and to the SFD of cosmic-diamonds from supernovae explosions). Industry applications in resource predictions are from mixtures of diamonds (MDS and SD), and extrapolation to larger stones is valid because the fundamental law is independent of origins.
DS201911-2530
2019
Haggerty, S.E.Haggerty, S.E.Micro-diamonds: proposed origins, crystal growth laws, and the underlying principle governing resource predictions.Geochimica et Cosmochimica Acta, Vol. 266, pp. 184-196.Globalmicrodiamonds

Abstract: The origin of micro-diamonds is controversial and although the application to determine the grade and value of macro-diamonds in kimberlite/lamproite bodies continues to receive widespread usage there are several outstanding factors generally not considered, the most important of which is genesis. The issue is addressed in this study in the context that two classes of small diamonds (generally <0.5?mm and rarely <1?mm) are recognized. Micro-diamonds sensu-stricto (MDS) are typically sharp-edged octahedra, free of mineral inclusions and surface etching or corrosion, increase exponentially with decreasing size and are in overwhelming larger concentrations, by orders of magnitude, relative to macro-diamonds (>0.5?mm). The second class of small diamonds (SD <0.5?mm), used in industrial applications, may have modified solution-growth morphologies (e.g. dodecahedra, tetrahexahedra and related forms), and include loosely bonded polycrystalline diamonds (framesite), boart, fibrous cubes and broken fragments. There are large differences in volume to surface-area ratios between MDS and SD, demonstrating unequivocally that pristine and solution-modified forms could not have co-existed in equilibrium under the same P-T-t-fO2 conditions in the mantle. From detailed studies of N and C in diamond, and experimental results on the redox-partitioning of N in the presence of metallic Fe, it is concluded that MDS are plume-related from the D? core-mantle boundary, and are melt-derived in lower mantle proto-kimberlite. The lower mantle is expectedly saturated in metallic Fe, and is highly depleted in N which is siderophile under very low f O2 conditions, a setting in which excessively large (?100 to 3000 ct), but rare Type II mega-diamonds (but also MDS) are inferred to have originated. These diamonds (Type II, Ib, IaA) are distinct from the majority of N-rich Type Ia upper mantle macro-diamonds that grew slowly by metasomatic processes and annealed over long periods. Two crystal growth laws are possibly applicable to the size-distribution of diamonds encountered in kimberlites/lamproites. Gibrat’s Law of proportionate, short-term crystal growth in open systems by advection is applicable to magmatic MDS, whereas macro-diamonds bear some relation to McCabe’s Law of long-term, relatively constant crystal growth, by diffusion metasomatism. The range from small to large diamonds (SFD size-frequency-distribution) is lognormal but is composed of two segments: the smaller size (<0.5?mm) fraction has an overall linear distribution, whereas macro-diamonds (>0.5?mm) are quadratic. The two distributions meet or overlap in a marked discontinuity, implying but not proving distinct origins. The power law governing SFD lognormal distributions is fundamental and is widespread across an enormous number of disciplines (from biology to economics), and may be universal (e.g. it is applicable to planetary scale meteorite impact craters, and to the SFD of cosmic-diamonds from supernovae explosions). Industry applications in resource predictions are from mixtures of diamonds (MDS and SD), and extrapolation to larger stones is valid because the fundamental law is independent of origins.
DS1992-0648
1992
Haggin, J.Haggin, J.Carbon nitride, Beta-C3N4 developed by researchers at Northwestern University may be harder than diamondChem. Eng. News, Vol. 70, No. 21, May 25, p. 20. # HV 770GlobalSynthetic diamond, Industrial use
DS201312-0351
2013
Haghlighipour, N.Haghlighipour, N.The formation and dynamics of super-Earth planets.Annual Review of Earth and Planetary Sciences, Vol. 41, pp. 469-495.MantleTectonics
DS1991-0645
1991
Haglund, D.Haglund, D., Von Bredow, A.The rise of the new protectionism in North AmericaRaw Materials Alert, Vol. 8, No. 1, pp. 7-14Canada, United States, MexicoEconomics, Politics
DS1950-0066
1951
Hagner, A.F.Hagner, A.F.Anorthosite of the Laramie Range, Albany CountyWyoming Geological Survey Bulletin., No. 43, 15P.United States, Wyoming, State Line, Rocky MountainsBlank
DS1950-0346
1957
Hagner, A.F.Newhouse, W.H., Hagner, A.F.Geologic Map of the Anorthosite Areas Southern Part of the Laramie Range, Wyoming.United States Geological Survey (USGS) MAP, MF-119.United States, Wyoming, State Line, Rocky MountainsBlank
DS1989-0092
1989
Hagni, R.D.Baxter, J.W., Kisvarsanyi, E.B., Hagni, R.D., Bradbury, J.C.Precambrian and Paleozoic geology and ore deposits in the MidcontinentregionAmerican Geophysical Union (AGU) 28th. International Geological Congress Field Trip Guidebook, No. T 147, 68pMissouriGuidebook
DS1994-0697
1994
Hagni, R.D.Hagni, R.D., Kogut, A.I., Schneider, G.I.C.Geology of the Okorusu carbonatite related fluorite deposit north centralNamibia.Geological Society of America Abstracts, Vol. 26, No. 5, April p. 18. Abstract.NamibiaCarbonatite
DS1995-0719
1995
Hagni, R.D.Hagni, R.D., Kogut, A.I., Schneider, G.I.C.The fluorite deposits of the Okorusu alkaline igneous and carbonatitecomplex, north central Namibia.Geological Society Africa 10th. Conference Oct. Nairobi, p. 129-30. Abstract.NamibiaAlkaline rocks, carbonatite, Deposit -Okorusu
DS1995-0988
1995
Hagni, R.D.Kogut, A., Hagni, R.D., et al.Genetic relationship of the fluorite deposits to the carbonatite intrusionat Okorusu N-C Namibia...Geological Society of America (GSA) Abstracts, Vol. 27, No. 6, abstract p. A 379.NamibiaGeochemistry, Carbonatite
DS1997-0463
1997
Hagni, R.D.Hagni, R.D., Kogut, A.Variations in ores, host rocks and ore controls for the carbonatite related fluorspar deposits at Okoruso.Geological Society of America (GSA) Abstracts, Vol. 29, No. 4, Apr. p. 18.NamibiaCarbonatite
DS1997-0464
1997
Hagni, R.D.Hagni, R.D., Kogut, A.I., Schneider, G.I.C.Mineralogical flurospar deposits at Okorusu north central NamibiaGeological Association of Canada (GAC) Abstracts, POSTER.NamibiaCarbonatite, Flurospar
DS1997-1271
1997
Hagni, R.D.Wright, W.R., Mariano, A.N., Hagni, R.D.Geological, petrological, mineralogical ( including rare earth elements (REE) and Nb-Tamineralization) and geochemical examinationGeological Association of Canada (GAC) Abstracts, POSTER.Quebec, Labrador TroughCarbonatite, Deposit - Eldor
DS1999-0280
1999
Hagni, R.D.Hagni, R.D.Mineralogy and beneficiation problems involving fluorspar concentrates from carbonatite related ....Min. Petrol., Vol. 67, No. 1-2, pp. 33-44.GlobalCarbonatite, Mineralogy
DS1999-0808
1999
Hagni, R.D.Wright, W.R., Mariano, A., Hagni, R.D.Pyrochlore mineralization and glimmerite formation in the Elder ( Lake LeMoyne) carbonatite complex.The Canadian Institute of Mining, Metallurgy and Petroleum (CIM) 33rd Forum Industrial Minerals Proceedings, Vol. 50, pp. 205-13.Quebec, Ungava, LabradorCarbonatite - mineralogy
DS2000-0893
2000
Hagni, R.D.Shivdasan, P.A., Hagni, R.D.The origin and emplacement of fluorite ore bodies by replacement of pegmatitic carbonatite, sodic feniteIgc 30th. Brasil, Aug. abstract only 1p.NamibiaCarbonatite, Deposit - Okorusu
DS2001-0433
2001
Hagni, R.D.Hagni, R.D., Shivdasan, P.A.Recognition of pegmatitic carbonatite intrusions in sodic fenite and their importance in fluorite ores...Journal of South African Earth Sciences, Vol. 32, No. 1, p. A 17 (abs)NamibiaCarbonatite, Okoruso
DS2002-0630
2002
Hagni, R.D.Hagni, R.D., Shivdansan, P.A., Mariano, A.N.Cathodluminescence microscopy applications to carbonatite ores: carbonatites and fluorite ores and concentrates at Okorusu, Namibia.18th. International Mineralogical Association Sept. 1-6, Edinburgh, abstract p.151,246.NamibiaCarbonatite
DS2002-0631
2002
Hagni, R.D.Hagni, R.D., Shivdasa, P.A.Paragenetic sequence of pyrrhotite alterations to marcasite, pyrite, magnetite, hematite and goethite in pyroxene and pegmatitic carbonatites and fluorite ores.11th. Quadrennial Iagod Symposium And Geocongress 2002 Held Windhoek, Abstract p. 26.NamibiaCarbonatite, Deposit - Okorusu
DS2002-0632
2002
Hagni, R.D.Hagni, R.D., Shivdasan, P.A.The carbonatite related fluorspar deposits at Okorusu: mineralogy, controls of ore emplacement, genesis...16th. International Conference On Basement Tectonics '02, Abstracts, 2p., 2p.Namibia, India, BrazilComparison to Amba Dongar and Mato Preto
DS2002-1473
2002
Hagni, R.D.Shivdasan, P.A., Hagni, R.D., Mariano, A.N.Character, paragenetic sequence and origin of the carbonatite host rocks for the fluorite deposits at Okorusu, Namibia.11th. Quadrennial Iagod Symposium And Geocongress 2002 Held Windhoek, Abstract p. 40.NamibiaCarbonatite - mineralogy
DS201610-1866
2016
Hagni, R.D.Hagni, R.D.The alkaline igneous carbonatite complex and fluorspar deposits at Okorusu, north centra Namibia.GSA Annual Meeting, 1/2p. abstractAfrica, NamibiaCarbonatite

Abstract: The Okorusu Alkaline Igneous-Carbonatite Complex is located about 50 km north of Otjiwarongo in North-Central Namibia. The complex was intruded during early Cretaceous into late Precambrian Damaran Series metasedimentary rocks. It is nearly circular in plan view with a diameter of about 8 km. Coarse-grained nepheline syenites and foyaites are exposed in low hills near the northern edge of the complex. Early alkalie-rich fluids pervasively fenitized the metasedimentary rocks along the southern margin of the complex forming an east-west ridge of resistant hills that include Okorusu Mountain. The fenites were subsequently brecciated and intruded by several carbonatites, especially medium-grained iron-rich diopside pyroxene carbonitite and very coarse-grained pegmatitic carbonatite. In addition to predominant calcite, the carbonatites contain titaniferous vanadiferous magnetite crystals and diopside crystals as large as one-third meter and hexagonal pyrrhotite crystals as long as one meter. For the past two decades, Okoruru has been the leading carbonatite-related fluorspar producer in the world. Fluorspar has been mined from five separate ore deposits in open pits A, B, C, D, and E. The deposits formed principally by the replacement of carbonatite as shown by local unreplaced remnants of carbonatite in the fluorspar ores, goethite pseudomorphs in fluorspar ores after carbonatite magnetite, diopside, and pyrrhotite crystals, transitions of the ores into carbonatite, and by elevated phosphorus contents resulting from carbonatite apatite crystals that were incompletely replaced by fluorite. Locally, marbles also are replaced by fluorite to form fluorspar ores that are distinguished from carbonatite-replacement fluorspar ores by their finer grain size and lack of phosphorus contents. Fluid inclusions in the fluorite crystals indicate that the fluorspar ores were deposited from 166 to 128oC from fluids of low salinity with less than 5% NaCl equivalent. The genesis of the fluorspar ores is interpreted to have resulted from deeply circulated ground waters that dissolved fluorine from carbonatite at depth. The fluorine in those ore fluids combined with calcium released during the replacement of calcite in carbonatite and marbles at the sites of the fluorspar ore deposition.
DS200512-0386
2005
Hagstrum, J.T.Hagstrum, J.T.Antipodal hotspots and bipolar catastrophes: were oceanic large body impacts the cause?Earth and Planetary Science Letters, Vol. 236, pp. 13-27.MantleHotspots, plumes
DS1860-0279
1877
Hague, A.Hague, A., Emmons, S.F.Volcanic Rocks, Green River Basin Leucite HillsUnited States Geological Survey (USGS), PP. 236-238.United States, Colorado Plateau, WyomingGeology, Petrology
DS201802-0238
2018
Hahn, A.Garzanti, E., Dinis, P., Vermeesch, P., Ando, S., Hahn, A., Huvi, J., Limonta, M., Padoan, M., Resentini, A., Rittner, M., Vezzoli, G.Sedimentary processes controlling ultralong cells of littoral transport: placer formation and termination of the Orange sand highway in southern Angola.Sedimentology, Vol. 65, 2, pp. 431-460.Africa, Angolaplacers, alluvials

Abstract: This study focuses on the causes, modalities and obstacles of sediment transfer in the longest cell of littoral sand drift documented on Earth so far. Sand derived from the Orange River is dragged by swell waves and persistent southerly winds to accumulate in four successive dunefields in coastal Namibia to Angola. All four dunefields are terminated by river valleys, where aeolian sand is flushed back to the ocean; and yet sediment transport continues at sea, tracing an 1800 km long submarine sand highway. Sand drift would extend northward to beyond the Congo if the shelf did not become progressively narrower in southern Angola, where drifting sand is funnelled towards oceanic depths via canyon heads connected to river mouths. Garnet-magnetite placers are widespread along this coastal stretch, indicating systematic loss of the low-density feldspatho-quartzose fraction to the deep ocean. More than half of Moçamedes Desert sand is derived from the Orange River, and the rest in similar proportions from the Cunene River and from the Swakop and other rivers draining the Damara Orogen in Namibia. The Orange fingerprint, characterized by basaltic rock fragments, clinopyroxene grains and bimodal zircon-age spectra with peaks at ca 0•5 Ga and ca 1•0 Ga, is lost abruptly at Namibe, and beach sands further north have abundant feldspar, amphibole-epidote suites and unimodal zircon-age spectra with a peak at ca 2•0 Ga, documenting local provenance from Palaeoproterozoic basement. Along with this oblique-rifted continental margin, beach placers are dominated by Fe-Ti-Cr oxides with more monazite than garnet and thus have a geochemical signature sharply different from beach placers found all the way along the Orange littoral cell. High-resolution mineralogical studies allow us to trace sediment dispersal over distances of thousands of kilometres, providing essential information for the correct reconstruction of ‘source to sink’ relationships in hydrocarbon exploration and to predict the long-term impact of man-made infrastructures on coastal sediment budgets.
DS200712-0989
2006
Hahn, B.C.Silver, P.G., Hahn, B.C., Kreemer, C., Holt, W.E., Haines, J.Convergent margins, growing and shrinking continents, and the Wilson cycle.Geological Society of America Annual Meeting, Vol. 38, 7, Nov. p. 212 abstractUnited StatesBasin and Range, Wilson Cycle
DS1950-0273
1956
Hahn, E.Hahn, E.Diamond, 1956London: Weidenfeld And Nicholson., 262P.GlobalKimberlite, Kimberley, Janlib, Diamond
DS1950-0274
1956
Hahn, E.Hahn, E.Diamond. the Spectacular Story of the Earth's Rarest Treasure and Man's Greatest Greed.New York: Doubleday And Co., 314P.South AfricaHistory, Kimberley
DS2000-0586
2000
Hahn, H.Lorenzi, M.L.B., Hahn, H.Rare earth elements (REE) mineralization at Barra do Itapirapua alkaline carbonatite complex Sp/Pr Brasil.Igc 30th. Brasil, Aug. abstract only 1p.BrazilCarbonatite
DS1960-0677
1966
Hahn, M.Hahn, M.Edelsteinkunde LeichtgemachtIdar-oberstein:, GlobalKimberlite, Kimberley, Janlib, Gemology
DS200512-1102
2004
Hahne, K.Trumbull, R.B., Vietor, T., Hahne, K., Wackerle, R., Ledru, P.Aeromagnetic mapping and reconnaissance geochemistry of the Early Cretaceous Henties Bay Outjo dike swarm, Etendeka Igneous Province, Namibia.Journal of African Earth Sciences, Vol. 40, 1-2, Sept. pp. 17-29.Africa, NamibiaGeophysics - magnetics, basaltic dikes, geochemistry
DS1991-1239
1991
HaiNohda, S., Chen, Hai, Tatsumi, Y.Geochemical stratification in the upper mantle beneath northeast ChinaGeophysical Research Letters, Vol. 18, No. 1, January pp. 97-100ChinaMantle, Geochemistry
DS200412-1432
2004
Hai, X.Ni, Z., Zhai, M., Wang, R., Tong, Y., Shu, G., Hai, X.Discovery of Late Paleozoic retrograded eclogites from the middle part of the northern margin of North Chin a Craton.Chinese Science Bulletin, Vol. 49, 6, pp. 600-606. Ingenta 1042070211ChinaEclogite
DS201512-1923
2015
Haiblen, A.M.Haiblen, A.M., Ward, B.C., Normandeau, P.X., Prowse, N.D.Glacial history and landform genesis in the Lac de Gras area and implications for kimberlite drift prospecting.43rd Annual Yellowknife Geoscience Forum Abstracts, abstract p. 43.Canada, Northwest TerritoriesGeomorphology

Abstract: During the last glaciation, bedrock was eroded, transported and deposited by the Laurentide Ice Sheet across much of Canada. The complex ice and meltwater processes that resulted in sediment deposition are not completely understood. In the central Slave Craton, Northwest Territories, glacial sediments overly many diamond-bearing kimberlites. Diamond deposits in the Lac de Gras area were discovered in the early 1990s by drift prospecting. To better interpret drift prospecting datasets a more thorough understanding of the detailed glacial history of the area is required. We spent six weeks in the Lac de Gras area in summer 2015. Field mapping was complimented by a number of other techniques to elucidate the glacial history of the area. Enigmatic landforms were examined in detail and pits were dug to examine their sedimentology. Samples of matrix material were collected to compare grain size distribution between different sediment types. Pebble counts were done to consider sediment provenance. We also collected ground-penetrating radar profiles to look for stratified sediments within enigmatic mounds. High-resolution orthophotos and a one metre LiDAR digital elevation model of the area, obtained by Dominion Diamond Ekati Corporation, have also been used to investigate landform genesis and the glacial history of the area. In the Lac de Gras area many meltwater corridors can be identified in the high-resolution imagery. These corridors are typically 300-1500 m wide and form dendritic networks. Between the corridors, sandy till of varying thickness overlies bedrock. Within corridors, glaciofluvial landforms and scoured bedrock are common. Also associated with corridors are many mounds of enigmatic origin. These mounds commonly occur in groups and are typically 20-100 m wide and rise 5-15 m above the surrounding area. They are usually composed of an unstratified to poorly-stratified sandy diamicton containing no clay and minor silt. Matrix grain size distribution and pebble lithology results from some mounds are similar to those of nearby regional till. However, patches of well-stratified sediments, exhibiting laminated silts as well as climbing ripples in sand, do exist on parts of some mounds. GPR data suggests that these patches are discontinuous, and that the majority of mounds are composed largely of sandy diamicton. Variation in the sedimentology of the mounds does not appear to be related to variations in mound morphology. It is likely that the majority of the glaciofluvial sediments in the Lac de Gras area were deposited during the final stages of ice retreat across the area when meltwater volumes were high. We suggest that the corridors were formed by subglacial meltwater flow. This is because glaciofluvial deposition almost exclusively occurs within corridors, very little till is found within corridors and the corridors have an undulating elevation profile in the direction of ice flow. Water must have played a role in the deposition of the well-stratified patches of sediment found on some mounds, however, the mounds may not be solely the product of subglacial meltwater flow. A thorough understanding of sediment transport and depositional processes is critical if kimberlite indicator mineral data is to be accurately interpreted.
DS1859-0125
1858
Haidinger, W.Haidinger, W.Der Fur Diamant Oder Noch Werthvolleres Ausgegebene Topas Des Herrn Dupoisat.Wien: Sitzungsberichte Der Mathem.-naturw., Vol. 32, BD. 3.GlobalGeology
DS201212-0278
2012
Haigis, V.Haigis, V., Salanne, M., Jahn, S.Thermal conductivity of minerals in the Earth's lower mantle from molecular dynamics.emc2012 @ uni-frankfurt.de, 1p. AbstractMantleGeothermometry
DS201212-0279
2012
Haigis, V.Haigis, V., Salanne, M., Jahn, S.Thermal conductivity of MgO, MgSiO3 perovskite and post-perovskite in the Earth's deep mantle.Earth and Planetary Science Letters, Vol. 355-356, pp. 102-108.MantleGeothermometry
DS2002-1790
2002
HailingZhlong, H., Chongqiang, Hailing, Cheng, RunshengThe geochemistry of lamprophyres in the Laowangzhai gold deposits, Yunnan: implications for source regionGeochemistry Journal, Vol. 36, pp. 91-112., Vol. 36, pp. 91-112.China, Yunnan ProvinceLamprophyres, minettes, Rare earths, REE, mantle characteristics
DS2002-1791
2002
HailingZhlong, H., Chongqiang, Hailing, Cheng, RunshengThe geochemistry of lamprophyres in the Laowangzhai gold deposits, Yunnan: implications for source regionGeochemistry Journal, Vol. 36, pp. 91-112., Vol. 36, pp. 91-112.China, Yunnan ProvinceLamprophyres, minettes, Rare earths, REE, mantle characteristics
DS2001-0434
2001
Hailstone, M.Hailstone, M.Report of exploration activities - brief notes on the Sault Ste Marie areaOntario Geological Survey Open File, No. 6050, pp.4, 18, 19, 20.OntarioDiamond exploration - brief
DS1993-0611
1993
Hailwood, E.A.Hailwood, E.A., Kidd, R.B.High resolution stratigraphyGeological Society of London Special Publication, No. 70, 350pGlobalTable of contents, Stratigraphy -chronology
DS1998-0556
1998
Haimila, D.Haimila, D.Metallic and industrial mineral assessment report on the airborne geophysics for Hanaa Chain Lakes property.Alberta Geological Survey, MIN 19980023AlbertaExploration - assessment, Buffalo Diamond Ltd.
DS1995-0720
1995
Haimila, N.Haimila, N., Yoshida, T.Assessment report on the Chain Lake Diamod claims in the Hanna areaAlberta Geological Survey, MIN 19950029AlbertaExploration - assessment
DS1996-0581
1996
Haimila, N.Haimila, N.Metallic and industrial mineral 1996 assessment report on the Calling Lakearea.Alberta Geological Survey, MIN 19960018AlbertaExploration - assessment
DS1997-0465
1997
Haimila, N.Haimila, N.Metallic and industrial mineral assessment report on diamond exploration program Heart/Farrel Lake areas.Alberta Geological Survey, MIN 19970001AlbertaExploration - assessment
DS1998-0557
1998
Haimila, N.Haimila, N.Metallic and industrial mineral assessment report on the exploration work in the Bearhead Creek property.Alberta Geological Survey, MIN 19990017AlbertaExploration - assessment, Buffalo Diamonds Ltd.
DS1998-0558
1998
Haimila, R.Haimila, R.Metallic and industrial mineral assessment report on the Calling Lake areaAlberta Geological Survey, MIN 19980005AlbertaExploration - assessment
DS1983-0178
1983
Haimson, B.C.Coates, M.S., Haimson, B.C., Hinze, W.J., Van schmus, W.R.Introduction to the Illinois Deep Hole Project/Journal of Geophysical Research, Vol. 88, No. B9 SEPT. 10, PP. 7267-7750GlobalMid Continent
DS1990-0634
1990
Haimson, B.C.Haimson, B.C.Shallow tests suggest crustal stress rotation west of the midcontinentrift: verification needed through intermediate depth holesGeological Society of America (GSA) Annual Meeting, Abstracts, Vol. 22, No. 7, p. A197GlobalCrustal stress, Geophysics
DS1992-0649
1992
Haimson, B.C.Haimson, B.C., Lee, M.Y.Stress measurements in Quimby granite and the state of stress in The western midcontinentGeological Society of America (GSA) Abstract Volume, Vol. 24, No. 4, April p. 17. abstract onlyIowaMidcontinent Rift, Structure
DS200712-0319
2007
Haines, A.J.Flesch, L.M., Holt, W.E., Haines, A.J., Wen, L., Shen-Tu BingmingThe dynamics of western North America: stress magnitudes and the relative role of gravitational potential energy, plate interaction, boundary and basalGeophysical Journal International, Vol. 169, 3, pp. 866-896.United States, CanadaTectonics
DS200812-0405
2008
Haines, A.J.Ghosh, A., Holt, W.E., Wen, L., Haines, A.J., Flesch, L.M.Joint modeling of lithosphere and mantle dynamics elucidating lithosphere mantle coupling.Geophysical Research Letters, Vol. 35, 16, L16309-10.MantleTectonics
DS1998-0310
1998
Haines, B.J.Davis, C.H., Kluever, C.A., Haines, B.J.Elevation change of the southern Greenland ice sheetScience, Vol. 279, No. 5359, Mar. 27, pp. 2086-88.GreenlandGeomorphology
DS1981-0121
1981
Haines, G.V.Coles, R.L., Haines, G.V., Hannaford, W.Broad Scale Magnetic Anomalies Over Central and Eastern Canada: a Discussion.Canadian Journal of Earth Sciences, Vol. 18, PP. 657-661.Canada, OntarioMid-continent, Geophysics
DS200712-0989
2006
Haines, J.Silver, P.G., Hahn, B.C., Kreemer, C., Holt, W.E., Haines, J.Convergent margins, growing and shrinking continents, and the Wilson cycle.Geological Society of America Annual Meeting, Vol. 38, 7, Nov. p. 212 abstractUnited StatesBasin and Range, Wilson Cycle
DS201012-0395
2010
Haines, S.Koehm, D., Lindenfeld, M., Rumpker, G., Aanyu, K., Haines, S., Passchier, C.W., Sachu, T.Active transgression faults in rift transfer zones: evidence for complex stress fields and implications for crustal fragmentation processes in the western branchInternational Journal of Earth Sciences, Vol. 99, 7, pp. 1633-1642.Africa, East AfricaEast African Rift
DS1989-0569
1989
Haines, S.M.Haines, S.M., Meen, J.K.Igneous and metamorphic continental crust beneath the Valley and Ridge ofVirginia: evidence from xenolithsGeological Society of America (GSA) Abstract Volume, Vol. 21, No. 3, p.19. (Abstract only)GlobalMantle
DS1983-0171
1983
Haines McBride, M.Chenoweth, P.A., Haines McBride, M.Principal Structural Features of OklahomaPennwell Publishing Tulsa, Map 1: 500, 000 in colourMidcontinent, OklahomaTectonics
DS1992-0650
1992
Hainey, J.Hainey, J.Canadian Overseas Exploration Corporation. Namibian diamonds - a growthopportunity. Brokerage overviewCanaccord Research, June 11, 6pNamibiaNews item, Benguela, Canadian Overseas
DS1992-0651
1992
Hainey, J.Hainey, J.Morning comment " diamonds - panic on the street" follow up to yesterday's annoucement that some microdiamonds were from the drill bitCanaccord Research Release, November 20, 1pNorthwest TerritoriesNews item, Aber, SouthernEra
DS1992-0652
1992
Hainey, J.Hainey, J.Dia Met Minerals Limited - diamonds in Canada -close to reality. BrokerageoverviewCanaccord Research, August 13, 8pNorthwest TerritoriesNews item, Dia Met
DS1992-0653
1992
Hainey, J.Hainey, J.Dia Met BHP news -glittering. Brief comment on press release of December 1992Canaccord Research Release, December 9, 1pNorthwest TerritoriesNews item, Dia Met
DS1994-0698
1994
Hainey, J.Hainey, J.Canada's diamond playInternational Review, No. 57, Sept. pp. 2-3.CanadaNews item, Diamond exploration
DS1994-0699
1994
Hainey, J.Hainey, J.Lac de Gras Tli Kwi Cho results negative.. commentaryCanaccord Research, August 5, 5p.Northwest TerritoriesNews item, Kennecott Canada
DS1995-0721
1995
Hainey, J.Hainey, J.Dia Met Minerals Ltd. Diamonds at Lac de Gras - a mega projectCanaccord Capital Corporation, Jan. 30, 12p.Northwest TerritoriesNews item -Promotion, Dia Met Minerals Ltd.
DS1995-0722
1995
Hainey, J.Hainey, J.Diamonds -update discussion on Dia Met, Aber, Mountain Province, SouthernEra.Sanwa McCarthy Securities Limited, 10p.Northwest TerritoriesNews item, Brokerage overview
DS1995-0723
1995
Hainey, J.Hainey, J.Dia Met Minerals Ltd... latest news on diamond values impressiveSanwa McCarthy Securities Ltd., 1p.Northwest TerritoriesNews item, Dia Met Minerals Ltd.
DS1995-0724
1995
Hainey, J.Hainey, J.Dia Met minerals Ltd. Latest news on diamond values impressiveSanwa McCarthy Securities Limited, Sept. 14, 1p.Northwest TerritoriesNews item, Dia Met Minerals Ltd.
DS1996-0582
1996
Hainey, J.Hainey, J.Diamonds in Canada 1996 Steady progress " update and outlook"Equity Research, 31p.CanadaPromotion -markets, Dia Met, Aber, Mountain Province, Lytton, SouthernEra, Ashton, Winspear, Gerle
DS2002-1419
2002
Hainschwang, T.Schmetzer, K., Hainschwang, T., Bernhardt, H.-J., Kiefert, L.New chromium and vanadium bearing garnets from Tranoro, MadagascarGems & Gemology, Vol. 38, Summer, pp. 148-55.MadagascarGarnet - mineralogy ( not specific to diamonds)
DS200512-0387
2005
Hainschwang, T.Hainschwang, T., Katrusha, A., Vollstaedt, H.HPHT treatment of different classes of type I brown diamonds.Journal of Gemmology, Vol. 29, 5-6, pp. 261-273.Diamond - colour
DS200512-0388
2005
Hainschwang, T.Hainschwang, T., Simic, D., Fritsch, E., Deljanin, B., Woodring, S., DelRe, N.A gemological study of a collection of Chameleon diamonds.Gems & Gemology, Vol. 41, 1, Spring pp. 20-34.Diamond morphology - Chamelon - colour change
DS200512-0691
2005
Hainschwang, T.Massi, L., Fritsch, E., Collins, A.T., Hainschwang, T., Notari, F.The amber centres and their relation to the brown colour in diamond.Diamond and Related Materials, Vol. 14, 10, pp. 1623-1629.TechnologyDiamond color
DS200612-0415
2006
Hainschwang, T.Fristch, E., Massi, L., Hainschwang, T., Collins, A.T.The first color center related to the brown graining in type 1a natural diamonds.International Mineralogical Association 19th. General Meeting, held Kobe, Japan July 23-28 2006, Abstract p.TechnologyDiamond H- colour
DS200612-0521
2006
Hainschwang, T.Hainschwang, T., Notari, F., Fritsch, E., Massi, L., Breeding, C.M., Rondeau, B.Natural CO2 rich colored diamonds.GIA Gemological Research Conference abstract volume, Held August 26-27, p. 33. 1/2p.TechnologySpectroscopy
DS200712-0331
2007
Hainschwang, T.Fritsch, E., Massi, L., Rossman, G.R., Hainschwang, T., Joba, S., Dessapt, R.Thermochromic and photochromic behaviour of chameleon diamonds.Diamond and Related Materials, Vol. 16, 2, pp. 401-408 Ingenta 1070685097TechnologyDiamond morphology
DS200712-0332
2007
Hainschwang, T.Fritsch, E., Rondeau, B., Hainschwang, T., Quellier, M.H.A contribution to the understanding of pink color in diamond: the unique historical Grand Cond.Diamond and Related Materials, Vol. 16, 8, pp. 1471-1474.TechnologyDiamond - colour
DS200712-0333
2007
Hainschwang, T.Fritsch, E., Rondeau, B., Hainschwang, T., Quellier, M-H.A contribution to the understanding of pink colour in diamond: the unique, historical 'Grand Conde'.Diamond and Related Materials, Vol. 16, 8, August pp.1471-1474.TechnologyDiamond colour
DS200812-0441
2008
Hainschwang, T.Hainschwang, T., Notari, F., Fritsch, E., et al.HPHT treatment of CO2 containing and CO2 related brown diamonds.Diamond and Related materials, Vol. 17, 3, pp. 340-351.TechnologyType 1 brown diamonds
DS200912-0785
2009
Hainschwang, T.Van der Bogert, C.H., Smith, C.P., Hainschwang, T., McClure, S.F.Gray to blue to violet hydrogen rich diamonds from the Argyle mine, Australia.Gems & Gemology, Vol. 45, 1, Spring pp. 20-37.AustraliaDeposit - Argyle, diamond mineralogy
DS201012-0259
2010
Hainschwang, T.Hainschwang, T.The role of spectroscopy for the distinction of natural colour and colour treated diamonds in the 21st century.International Mineralogical Association meeting August Budapest, abstract p. 24.TechnologySpectroscopy
DS201012-0703
2010
Hainschwang, T.Shiryaev, A.A.,Wiedenbeck, M., Hainschwang, T.Oxygen in bulk monocrystalline diamonds and its correlations with nitrogen.Journal of Physics Condensed Matter, Vol. 22, 4, pp. 45801-45806.TechnologyDiamond crystallography
DS201312-0352
2013
Hainschwang, T.Hainschwang, T., Fritsch, E., Notari, F., Rondeau, B., Katrusha, A.The origin of color in natural C center bearing diamonds.Diamond and Related Materials, Vol. 39, pp. 27-40.TechnologyDiamond colour
DS201312-0353
2013
Hainschwang, T.Hainschwang, T., Karamelas, S., Fristch, E.Luminescence spectroscopy and microscopy applied to study gem materials: a case study of C centre containing diamonds.Mineralogy and Petrology, Vol. 107, 3, pp. 393-413.TechnologySpectroscopy
DS201312-0637
2013
Hainschwang, T.Nasdala, L., Grambole, D., Wildner, M., Gigler, A.M., Hainschwang, T., Zaitsev, A.M., Harris, J.W., Milledge, J., Schulze, D.J., Hofmeister, W., Balmer, W.A.Radio-colouration of diamond: a spectroscopic study.Contributions to Mineralogy and Petrology, Vol. 165, pp. 843-861.Africa, South Africa, Democratic Republic of Congo, South America, Brazil, VenezuelaDiamond - colour
DS201503-0147
2014
Hainschwang, T.Hainschwang, T., Notari, F., Vadaszi, E.The Rhodesian Star: an exceptional asteriated diamond.The Journal of Gemmology, Vol. 34, 4, pp. 306-315.Africa, ZimbabweDiamonds notable
DS201503-0148
2014
Hainschwang, T.Hainschwang,T.Diamants de type 1b: relations entre les proprietes physiques et gemmologiques des diamants contenant de l'Azote Isole.Thesis, University of Nantes, France., In French * reference onlyTechnologyNitrogen
DS201509-0398
2015
Hainschwang, T.Hainschwang, T., Notari, F.The first undisclosed colourless CVD synthetic diamond discovered in a parcel of natural melee sized diamonds.The Journal of Gemmology, Vol. 334, 6, pp. 518-522.TechnologySynthetics

Abstract: During the March 2015 Diamond Show in Basel, Switzerland, a parcel of 6,000 melee-sized colourless diamonds was analysed using the GGTL Diamond Fluorescence Imaging (DFI) Laser+ fluorescence imaging and spectroscopy system. From the entire parcel, one sample stood out clearly with unusual fluorescence colours and distribution, combined with a photoluminescence spectrum that clearly indicated it was a synthetic diamond grown by chemical vapour deposition (CVD).
DS201809-2005
2017
Hainschwang, T.Cassette, P., Notari, F., Lepy, M-C., Caplan, C., Pierre, S., Hainschwang, T., Fritsch, E.Residual radioactivity of treated green diamonds.Applied Radiation and Isotopes, Vol. 126, 1, pp. 66-72.Globaldiamond - green

Abstract: Treated green diamonds can show residual radioactivity, generally due to immersion in radium salts. We report various activity measurements on two radioactive diamonds. The activity was characterized by alpha and gamma ray spectrometry, and the radon emanation was measured by alpha counting of a frozen source. Even when no residual radium contamination can be identified, measurable alpha and high-energy beta emissions could be detected. The potential health impact of radioactive diamonds and their status with regard to the regulatory policy for radioactive products are discussed.
DS201811-2578
2015
Hainschwang, T.Hainschwang, T., Notari, F.Standards and protocols for emerald analysis in gem testing laboratories.InColor, December pp. 106-114.Globalemeralds
DS202012-2218
2020
Hainschwang, T.Hainschwang, T., Notari, F., Pamies, G.The origin of 1330 nm center diamonds. ( hydrogen)Diamond and Related Materials, in press available, 19p. PdfGlobalspectroscopy

Abstract: This study covers hydrogen-rich fancy color diamonds that exhibit complex spectra from the UV all the way to the mid-IR. The diamonds with such spectra that are included here show a large range of colors from brownish yellow to brown, yellow-green to olive and gray to violet. The color origin of such diamonds has always been stated as “hydrogen-related”, without much evidence pointing towards hydrogen actually causing absorptions in the visible spectral range, but only based on their unusually high IR active hydrogen content determined via their FTIR spectra. The diamonds analyzed during this work always showed a series of absorptions in the near-infrared at 7495, 7850, 8255, and 8615 cm?1. For the first time, this here presented study shows the results of low temperature near-infrared spectroscopy performed for a series of differently colored diamonds that all showed these NIR absorptions. When measured at 77 K, it became clear that these NIR bands are actually part of an electronic optical center with ZPLs at 1329.8 to 1330.2 nm (7520-7518 cm?1)/1331.8 to 1332.2 nm (7508-7506 cm?1) and 1341 to 1341.2 nm (7457-7456 cm?1). In this paper we will refer to this defect as the "1330 nm center" (which corresponds to 7519 cm?1) for the sake of brevity. The detailed analysis of the spectra has demonstrated that the colors of diamonds that exhibit the 1330 nm center spectra are caused partially by this same center, and by complex absorption bands associated to two series of ZPLs represented by a number of sharp bands between 965 and 1001 nm, referred to as the 990 nm series in this study. Of these, the 990 nm series was found only in diamonds with significant IR active hydrogen concentrations, while the 1330 nm center was determined to be independent from the concentration of IR active hydrogen. The 1330 nm center was found in spectra lacking the 990 nm series of ZPLs, but the 990 nm series has never been found in spectra without the 1330 nm center. We are suggesting that the defects involved in these absorptions are all nickel?nitrogen-related, with the 1330 nm center lacking hydrogen while it seems reasonable to assume that the 990 nm series includes hydrogen in its structure.
DS202102-0196
2020
Hainschwang, T.Hainschwang, T.Wrestling with radiation ( diamonds)Gems & Jewellery, Vol. 29, 4, pp. 28-41.Globaldiamond colour
DS202201-0011
2021
Hainschwang, T.Deljanin, B., Collins, A., Zaitsev, A.,Lu, T., Vins, V., Chapman, J., Hainschwang, T.Diamonds - natural, treated & laboratory grown.Gemmological Research Industries Inc. Vancouver B.C., isbn 978-1777369231 184p.GlobalBook - notice

Abstract: For those who have some portable and advanced instruments, this book will serve as a handbook with many useful spectra, cross polarised filters and fluorescence reactions to compare, plus an Appendix with results of tests conducted using 11 portable instruments on 64 samples, and suggestions as to what instruments to use depending on budget and needs. Even if you are not a diamond specialist but are merely interested in the science of diamond, or you trade in diamonds, the information in this book will make you more knowledgeable and confident to talk about this beautiful gem with friends and clients.
DS201312-0061
2012
Haissen, F.Bea, F., Montero, P., Haissen, F., El Archi, A.2.46 Ga kasilite and nepheline syenites from the Awsard plution, Reguibat Rise of the West African Craton, Morocco. Generation of extremely K-rich magmas at the Archean-Proterozoic transition.Precambrian Research, Vol. 224, pp. 242-254.Africa, MoroccoUltrapotassic rocks
DS201603-0401
2016
Haissen, F.Montero, P., Haissen, F., Mouttaqi, A., Molina, J.F., Errami, A., Sadki, O., Cambeses, A., Bea, F.Contrasting SHRIMP U-Pb zircon ages of two carbonatite complexes from the peri-cratonic terranes of the Reguibat shield: implications for the lateral extension of the West African Craton.Gondwana Research, in press available 13p.Africa, West AfricaCarbonatite

Abstract: The Oulad Dlim Massif of the Western Reguibat Shield contains several carbonatite complexes of previously unknown age. The largest and best studied are Gleibat Lafhouda, composed of magnesiocarbonatites, and Twihinate, composed of calciocarbonatites. Gleibat Lafhouda is hosted by Archean gneisses and schists. It has a SHRIMP U-Th-Pb zircon crystallization age of 1.85 ± 0.03 Ga, a Nd model age of TCR = 1.89 ± 0.03 Ga, and a Sm-Nd age of 1.85 ± 0.39 Ga. It forms part of the West Reguibat Alkaline province. Twihinate, on the other hand, is much younger. It is hosted by Late Silurian to Early Devonian deformed granites and has a zircon crystallization age of 104 ± 4 Ma, which is within error of the age of the carbonatites of the famous Richat Structure in the southwest Reguibat Shield. Like these, the Twihinate carbonatites are part of the Mid-Cretaceous Peri-Atlantic Alkaline Pulse. The Twihinate carbonatites contain abundant inherited zircons with ages that peak at ca. 420 Ma, 620 Ma, 2050 Ma, 2466 Ma, and 2830 Ma. This indicates that their substratum has West African rather than, as previously suggested, Avalonian affinities. It has, however, a Paleoproterozoic component that is not found in the neighboring western Reguibat Shield. The 421 Ma to 410 Ma gneissic granites hosting Twihinate are epidote + biotite + Ca-rich garnet deformed I-type to A-type granites derived from magmas of deep origin compatible, therefore, with being generated in a subduction environment. These granites form a body of unknown dimensions and petrogenesis, the study of which will be of key importance for understanding the geology and crustal architecture of this region.
DS201703-0405
2017
Haissen, F.Haissen, F., Cambeses, A., Montero, P., Bea, F., Dilek, Y., Mouttaqi, A.The Archean kaisilite nepheline syenites of the Awsard intrusive massif ( Reguibat Shield, West African craton, Morocco) and its relationship to alkaline magmatism of Africa.Journal of African Earth Sciences, Vol. 127, pp. 16-50.Africa, MoroccoCraton - magmatism
DS202106-0965
2021
Haissen, F.Pujol-Sola, N., Dominguez-Carretero, D., Proenza, J.A., Haissen, F., Ikenne, M., Gonzales-Jiminez, J.M., Colas, V., Maacha, L., Garcia-Casco, A.The chromitites of the Neoproterozoic Bou Azzer ophiolite ( central Anti-Atlas, Morocco) revisited.Ore Geology Reviews, Vol. 134, 104166, 24p. PdfAfrica, Moroccomoissanite

Abstract: The Neoproterozoic Bou Azzer ophiolite in the Moroccan Anti-Atlas Panafrican belt hosts numerous chromitite orebodies within the peridotite section of the oceanic mantle. The chromitites are strongly affected by serpentinization and metamorphism, although they still preserve igneous relicts amenable for petrogenetic interpretation. The major, minor and trace element composition of unaltered chromite cores reveal two compositional groups: intermediate-Cr (Cr# = 0.60 - 0.74) and high-Cr (Cr# = 0.79 - 0.84) and estimates of parental melt compositions suggest crystallization from pulses of fore-arc basalts (FAB) and boninitic melts, respectively, that infiltrated the oceanic supra-subduction zone (SSZ) mantle. A platinum group elements (PGE) mineralization dominated by Ir-Ru-Os is recognized in the chromitites, which has its mineralogical expression in abundant inclusions of Os-Ir alloys and coexisting magmatic laurite (RuS2) and their products of metamorphic alteration. Unusual mineral phases in chromite, not previously reported in this ophiolite, include super-reduced and/or nominally ultra-high pressure minerals moissanite (SiC), native Cu and silicates (oriented clinopyroxene lamellae), but “exotic” zircon and diaspore have also been identified. We interpret that clinopyroxene lamellae have a magmatic origin, whereas super-reduced phases originated during serpentinization processes and diaspore is linked to late circulation of low-silica fluids related to rodingitization. Zircon grains, on the other hand, with apatite and serpentine inclusions, could either have formed after the interaction of chromitite with mantle-derived melts or could represent subducted detrital sediments later incorporated into the chromitites. We offer a comparison of the Bou Azzer chromitites with other Precambrian ophiolitic chromitites worldwide, which are rather scarce in the geological record. The studied chromitites are very similar to the Neoproterozoic chromitites reported in the Arabian-Nubian shield, which are also related to the Panafrican orogeny. Thus, we conclude that the Bou Azzer chromitites formed in a subduction-initiation geodynamic setting with two-stages of evolution, with formation of FAB-derived intermediate-Cr chromitites in the early stage and formation of boninite-derived high-Cr chromitites in the late stage.
DS2003-0999
2003
Hajari, S.Nasir, S., Hanna, S., Hajari, S.The petrogenetic association of carbonatite and alkaline magmatism: constraints fromMineralogy and Petrology, Vol. 77, 3/4, pp. 235-258.OmanCarbonatite
DS2003-1000
2003
Hajari, S.Nasir, S., Hanna, S., Hajari, S.The petrogenetic association of carbonatite and alkaline magmatism: constraints fromMineralogy and Petrology, Vol. 77, 3-4, pp. 235-58.OmanCarbonatite
DS200412-1408
2003
Hajari, S.Nasir, S., Hanna, S., Hajari, S.The petrogenetic association of carbonatite and alkaline magmatism: constraints from the Masfut-Rawda Ridge, Northern Oman MountMineralogy and Petrology, Vol. 77, 3/4, pp. 235-258.Africa, Arabia, OmanCarbonatite
DS1997-0466
1997
Hajdasinski, M.M.Hajdasinski, M.M.The evolution of the rate of return approach to mineral projectevaluation17th. World Mining Congress Oct. Mexico, pp. 509-518GlobalEconomics, IRR, Internal rate of return, valuations
DS2000-0377
2000
Hajdasinski, M.M.Hajdasinski, M.M.Internal rate of return IRR as a project ranking toolMining Engineering, Vol. 52, No. 11, Nov. pp. 60-4.GlobalEconomics - IRR not specific to diamonds, Torries concept of IRR not NPV compatible
DS201607-1299
2016
Hajjar, Z.Hajjar, Z., Wafik, A., Constantin, M., Bhilisse, M.Process of serpentinization in the ultramafic massif of Beni Bousera ( internal Rift, Morocco).Arabian Journal of Geosciences, Vol. 9, availableAfrica, MoroccoPeridotite
DS1985-0247
1985
HajnalGreen, A.G., Hajnal, WeberAn evolutionary model of the Western Churchill Province and western Margin of the Superior province in canada.Tectonophysics, Vol. 116, pp. 281-322.Saskatchewan, Manitoba, MontanaGeophysics - Seismics, Magnetics, North American Central Plains Anomaly
DS1997-0073
1997
HajnalBank, C.G., Bostock, M.G., Ells, R.M., VanDecar, HajnalLithospheric mantle structure beneath the Trans Hudson Orogen from teleseismic travel time inversion.Lithoprobe Report, No. 62, pp. 6-9.ManitobaGeophysics - seismics, Tectonics
DS2001-0211
2001
HajnalCorrigan, D., Lucas, Maxeiner, Hajnal, Swanzig, SymeTectonic assembly of the Saskatchewan - Manitoba segment of the Trans Hudson Orogen.Geological Association of Canada (GAC) Annual Meeting Abstracts, Vol. 26, p.29, abstract.Manitoba, SaskatchewanTectonics, Trans Hudson orogeny
DS1998-0559
1998
Hajnal, P.Hajnal, P.Special seismic images of the western margin of the Trans Hudson OrogenGeological Society of America (GSA) Annual Meeting, abstract. only, p.A108.SaskatchewanTectonic, Lithoprobe
DS1998-0560
1998
Hajnal, P.Hajnal, P., nemeth, B.P wave veolocity structure of the Trans Hudson OrogenGeological Society of America (GSA) Annual Meeting, abstract. only, p.A109.SaskatchewanTectonic, Lithoprobe
DS1970-0088
1970
Hajnal, Z.Hajnal, Z.A Continuous Deep Crustal Seismic Refraction and Near Vertical Reflection Profile in the Canadian Shield Interpreted By digital Processing Equipment.Ph.d. Thesis, University Manitoba., GlobalMid-continent, Geophysics
DS1986-0214
1986
Hajnal, Z.Ellis, R.M., Hajnal, Z., Stephenson, R.PRASE 1985crustal seismic reflection profiles in the Peace River Arch area, northwestern Alberta.Geological Survey of Canada (GSC) Open File, No. 2369, p. 51.AlbertaGeophysics - seismics
DS1990-0635
1990
Hajnal, Z.Hajnal, Z., Pandit, B.I., Scott, D., Reilkoff, B.Importance of selecting the most effective processing sequences and relevance of colour displays, analysing the Kapuskasing crustal refelctiondataTerra, Abstracts of Deep Seismic reflection profiling of the Continental, Vol. 2, December abstracts p. 180OntarioTectonics, Kapuskasing Zone
DS1991-1747
1991
Hajnal, Z.Trehu, A., Morelalhuissier, P., Meyer, R., Hajnal, Z., Karl, J.Imaging the Midcontinent Rift beneath Lake Superior using large aperture seismic dataGeophysical Research Letters, Vol. 18, No. 4, April pp. 625-628MidcontinentGeophysics -seismic, Tectonics-rift
DS1992-0654
1992
Hajnal, Z.Hajnal, Z., Lewry, J.Lithoprobe: Trans-Hudson orogen transect. Report of transect meeting held March 9-10, 1992Lithoprobe, Report No. 26, 160p. Geological Society of Canada (GSC) ser QE11LS26Manitoba, Saskatchewan, North DakotaTrans-Hudson Orogen, Geophysics -seismics
DS1993-0245
1993
Hajnal, Z.Chengnan Zhu, Hajnal, Z.Tectonic development of the northern Williston Basin: a seismic interpretation of an east-west regional profileCanadian Journal of Earth Sciences, Vol. 30, No. 3, March pp. 621-630SaskatchewanGeophysics -seismics, Williston Basin
DS1993-0403
1993
Hajnal, Z.Ellis, R.M., Hajnal, Z.Investigation of the properties of the Saskatchewan lithosphere using teleseismic waves.Geological Survey of Canada Open File, No. 2771, 69p. $ 13.00SaskatchewanGeophysics -seismics
DS1994-1033
1994
Hajnal, Z.Lewry, J.F., Hajnal, Z., Green, A., et al.Structure of a Paleoproterozoic continent-continent collision zone: a Lithoprobe seismic reflection profileTectonophysics, Vol. 232, pp. 143-160SaskatchewanGeophysics -seismics, lithoprobe, Orogen -Trans Hudson
DS1995-0493
1995
Hajnal, Z.Ellis, R.M., Hajnal, Z.Investigations of the properties of the lithosphere using teleseismicwaves.Geological Survey of Canada Open File, No. 3119, pp. 207-212.SaskatchewanGeophysics -seismics, Kimberlite
DS1996-0416
1996
Hajnal, Z.Ellis, R.M., Hajnal, Z., Bostock, M.G.Seismic studies on the Trans Hudson Orogen of western CanadaTectonophysics, Vol. 262, pp. 35-50.SaskatchewanGeophysics - seismics, Trans Hudson Orogeny, kimberlites
DS1996-0583
1996
Hajnal, Z.Hajnal, Z., Lucas, S., White, D., Lewry, J., et al.Seismic reflection images of high angle faults and linked detachments In the Trans Hudson Orogen.Tectonics, Vol. 15, No. 2, April pp. 427-439.Manitoba, OntarioCraton, Superior, Lithoprobe
DS1997-0467
1997
Hajnal, Z.Hajnal, Z., Nemeth, B., Forsyth, D.A.Mantle involvement in lithospheric collision: seismic evidence from the Trans-Hudson Orogen, Western Canada.Geophy. Res. Letters, Vol. 24, No. 16, Au. 15, pp. 2079-82.Saskatchewan, AlbertaMantle tectonics, Lithosphere
DS1998-0122
1998
Hajnal, Z.Bezdan, S., Hajnal, Z.Expanding spread profiles across the Trans-Hudson OrogenTectonophysics, Vol. 288, No. 1-4, Mar. pp. 83-92.Manitoba, Alberta, Northwest Territories, OntarioTectonics, Geophysics - seismic
DS1998-0899
1998
Hajnal, Z.Lucas, S., Hajnal, Z., White, D., Bleeker, W., AnsdellCrustal growth and continental collisions in the 1.9-1.8 Ga Trans HudsonOrogen, Manitoba and SaskatchewanGeological Society of America (GSA) Annual Meeting, abstract. only, p.A46.Manitoba, SaskatchewanTectonic, Trans Hudson Orogen
DS1998-1071
1998
Hajnal, Z.Nemeth, B., Hajnal, Z.Structure of the lithospheric mantle beneath the Trans-Hudson Orogen, Canada.Tectonophysics, Vol. 288, No. 1-4, Mar. pp. 93-104.Manitoba, Alberta, Northwest Territories, OntarioTectonics, Geophysics - seismic
DS1998-1072
1998
Hajnal, Z.Nemeth, B., Hajnal, Z.Seismic signature of the lower crust and lithospheric mantle below the Trans Hudson Orogen, Canada.Geological Association of Canada (GAC)/Mineralogical Association of Canada (MAC) Abstract Volume, p. A134. abstract.Saskatchewan, ManitobaGeophysics - seismics, Trans Hudson Orogen
DS1998-1112
1998
Hajnal, Z.Pandit, B., Hajnal, Z.Migration velocities for Trans Hudson Orogen(lithoprobe)transect reflection data.Geological Association of Canada (GAC)/Mineralogical Association of Canada (MAC) Abstract Volume, p. A140. abstract.Saskatchewan, ManitobaGeophysics - seismics, Trans Hudson Orogen
DS1998-1113
1998
Hajnal, Z.Pandit, B.I., Hajnal, Z.Sole thrust of the Trans Hudson OrogenGeological Society of America (GSA) Annual Meeting, abstract. only, p.A110.SaskatchewanTectonics, Trans Hudson Orogen
DS1998-1114
1998
Hajnal, Z.Pandit, B.I., Hajnal, Z., Ashton, K.E.New seismic images of the crust in the central Trans Hudson Orogen ofSaskatchewan.Tectonophysics, Vol. 290, No. 3-4, May 30, pp. 211-20.SaskatchewanGeophysics - seismics, Orogeny
DS1998-1115
1998
Hajnal, Z.Pandit, B.I., Hajnal, Z., Ashton, K.E.New seismic images of the crust in the central Trans - Hudson Orogen ofSaskatchewanTectonophysics, Vol. 290, No. 3-4, May 30, pp. 211-220SaskatchewanGeophysics - seismics, Orogeny
DS1999-0116
1999
Hajnal, Z.Carr, B.J., Hajnal, Z.P and S wave characterization of near surface reflectivity from glacialtills using vertical seismicGeophysics, Vol. 64, No. 3, May-June pp. 970-80.SaskatchewanGeophysics - seismics, Geomorphology - tills
DS2000-0378
2000
Hajnal, Z.Hajnal, Z.The crust beneath the Williston BasinGeological Association of Canada (GAC)/Mineralogical Association of Canada (MAC) 2000 Conference, 4p. abstract.Saskatchewan, North Dakota, South Dakota, MontanaGeophysics - seismics, Craton - Superior, Hearne, Wyoming
DS2000-1011
2000
Hajnal, Z.White, D.J., Zwanzig, H.V., Hajnal, Z.Crustal suture preserved in the Paleoproterozoic Trans Hudson Orogen, CanadGeology, Vol. 28, No. 6, June pp. 527-30.Saskatchewan, Manitoba, Ontario, Western CanadaGeophysics - seismics, gravity, Tectonics - subduction, suture
DS2002-0633
2002
Hajnal, Z.Hajnal, Z., White, D., Clowes, R., Stauffer, M.3- D perspective of the western portion of the Trans Hudson Orogen in SaskatchewanGac/mac Annual Meeting, Saskatoon, Abstract Volume, P.44., p.44.SaskatchewanGeophysics - seismics
DS2002-0634
2002
Hajnal, Z.Hajnal, Z., White, D., Clowes, R., Stauffer, M.3- D perspective of the western portion of the Trans Hudson Orogen in SaskatchewanGac/mac Annual Meeting, Saskatoon, Abstract Volume, P.44., p.44.SaskatchewanGeophysics - seismics
DS2002-1706
2002
Hajnal, Z.White, D.J., Lucas, S.B., Bleeker, W., Hajnal, Z., Lewry, J.F., Zwanzig, H.V.Suture zone geometry along an irregular Paleoproterozoic margin: the Superior boundary zone, Manitoba, Canada.Geology, Vol.30,8,Aug.pp.735-8.ManitobaTectonics
DS200512-0192
2005
Hajnal, Z.Corrigan, D., Hajnal,Z., Nemeth, B., Lucas, S.B.Tectonic framework of a Paleoproterozoic arc continent to continent continent collisional zone, Trans Hudson Orogen, from geological and seismic reflection studies.Canadian Journal of Earth Sciences, Vol. 42, 4, April pp. 421-434.Canada, Saskatchewan, ManitobaGeophysics - Lithoprobe
DS200512-0389
2005
Hajnal, Z.Hajnal, Z., Lewry, J., White, D., Ashton, K., Clowes, R., Stauffer, M., Gyorfi, I., Takacs, E.The Saskatchewan Craton and Hearne Province margin: seismic reflection studies in the western Trans Hudson Orogen.Canadian Journal of Earth Sciences, Vol. 42, 4, April pp. 403-419.Canada, Saskatchewan, ManitobaGeophysics - Lithoprobe
DS200512-0774
2005
Hajnal, Z.Nemeth, B., Clowes, R.M., Hajnal, Z.Lithospheric structure of the Trans Hudson Orogen from seismic refraction - wide angle reflection studies.Canadian Journal of Earth Sciences, Vol. 42, 4, April pp. 435-456.Canada, Saskatchewan, ManitobaGeophysics - Lithoprobe
DS200512-1175
2005
Hajnal, Z.White, D.J., Thomas, M.D., Jones, A.G., Hope, J., Nemeth, B., Hajnal, Z.Geophysical transect across a Paleoproterozoic continent-continent collision zone: the Trans-Hudson Orogen.Canadian Journal of Earth Sciences, Vol. 42, 4, April pp. 385-402.Canada, Northwest TerritoriesGeophysics - seismics
DS200612-0478
2006
Hajnal, Z.Gorman, A.R., Nemeth, B., Clowes, R., Hajnal, Z.An investigation of upper mantle heterogeneity beneath the Archean and Proterozoic crust of western Canada from lithoprobe controlled source seismic experiments.Tectonophysics, Vol. 416, 1-4, April 5, pp. 187-207.Canada, Alberta, Saskatchewan, Northwest TerritoriesGeophysics - seismics
DS201012-0111
2010
Hajnal, Z.Clowes, R.M., White, D.J., Hajnal, Z.Mantle heterogeneities and their significance: results from lithoprobe seismic reflection and refraction wide-angle reflection studies.Canadian Journal of Earth Sciences, Vol. 47, 4, pp. 409-443.MantleGeophysics - seismic
DS200612-0683
2006
Hakesworth, C.J.Kemp, A.I.S., Hakesworth, C.J., Paterson, B.A., Kinny, P.D.Episodic growth of the Gondwana supercontinent from hafnium and oxygen isotopes in zircon.Nature, Vol. 439, Feb. 2, pp. 580583.Mantle, GondwanaGeochronology - zircons
DS201212-0294
2012
Hakin, S.Henning, O.,Sorensen, S.S., Hakin, S., Pedersen, B.oC., Christiansen, Z.I.Non destructive identification of micrometer scale minerals and their position within a bulk sample.Canadian Mineralogist, Vol. 50, 2, pp. 501-509.TechnologyMicrotomography
DS200512-0641
2005
Hakkanen, H.Lindblom, J., Holsa, J., Papunen, H., Hakkanen, H.Luminescence study of defects in synthetic as grown and HPHT diamonds compared to natural diamonds.American Mineralogist, Vol. 90, Feb-Mar. pp. 428-440.Cathodluminescence
DS200512-0642
2005
Hakkanen, H.Lindblom, J., Holsa, J., Papunen, H., Hakkanen, H.Luminescence study of defects in synthetic as-grown and HPHT diamonds compared to natural diamonds.American Mineralogist, Vol. 90, pp. 428-440.Photoluminescence technology, UHP
DS1989-0570
1989
Hakki, W.Hakki, W.Tectonic structures and their importance for the possibility of localization of diamond bearing intrusions in the Mauritanian Craton and the Arabian shieldArabian Mineralogy Journal, Vol.9, No. 1-2, pp. 60-64GlobalTectonics, Intrusions
DS1900-0320
1905
Hakluyt, R.Hakluyt, R.The Principal Navigations of J. Cartier 1491-1557. the Third Voyage Into Counties of Canada, Hochelaga and Saguenay.Glasgow: J. Maclehose And Sons, Vol. 8, PP. 263-272.Canada, QuebecHistory
DS201906-1271
2019
HalBarry, P.H., de Moor, J.M., Giovannelli, D., Schrenk, M., Hummer, D.R., Lopez, T., Pratt, C.A., Alpizar Segua, Y., Battaglia, A., Beaudry, A., Bini, G., Cascante, M., d'Errico, G., di Carlo, M., Fattorini, D., Fullerton, K., H+Gazel, E., Gonzalez, G., HalForearc carbon sink reduces long term volatile recycling into the mantle.Nature , 588, 7753, p. 487.Mantlecarbon

Abstract: Carbon and other volatiles in the form of gases, fluids or mineral phases are transported from Earth’s surface into the mantle at convergent margins, where the oceanic crust subducts beneath the continental crust. The efficiency of this transfer has profound implications for the nature and scale of geochemical heterogeneities in Earth’s deep mantle and shallow crustal reservoirs, as well as Earth’s oxidation state. However, the proportions of volatiles released from the forearc and backarc are not well constrained compared to fluxes from the volcanic arc front. Here we use helium and carbon isotope data from deeply sourced springs along two cross-arc transects to show that about 91 per cent of carbon released from the slab and mantle beneath the Costa Rican forearc is sequestered within the crust by calcite deposition. Around an additional three per cent is incorporated into the biomass through microbial chemolithoautotrophy, whereby microbes assimilate inorganic carbon into biomass. We estimate that between 1.2 × 108 and 1.3 × 1010 moles of carbon dioxide per year are released from the slab beneath the forearc, and thus up to about 19 per cent less carbon is being transferred into Earth’s deep mantle than previously estimated.
DS1993-1138
1993
Halabura, S.Nixon, P.H., Gummer, P.K., Halabura, S., Leahy, K., Finlay, S.Kimberlites of volcanic facies in the Sturgeon Lake areaRussian Geology and Geophysics, Vol. 34, No. 12, pp. 66-76.SaskatchewanVolcanic facies
DS1990-0611
1990
Halabura, S.P.Gummer, P.K., McGowan, S.E., Halabura, S.P.Diamond exploration at Prince Albert, Saskatchewan, CanadaAmerican Institute of Mining, Metallurgical, and Petroleum Engineers (AIME) Meeting, Salt Lake City, February 26, Non speaker/no preprintSaskatchewanExploration, Overview
DS1990-0636
1990
Halabura, S.P.Halabura, S.P.Soft rocks can provide hard rock answersModern Exploration Techniques, editors L.S. Beck, C.T. Harper, Saskatchewan, p.166-167SaskatchewanGeophysics, Craton
DS200712-0204
2007
HalamaCourtier, A.M., Jackson, Lawrence, Wang, Lee, Halama, Warren, Workman, Xu, Hirschmann, Larson, Hart, Lithgo-Bertelloni, Stixrude, ChenCorrelation of seismic and petrologic thermometers suggests deep thermal anomalies beneath hotspots.Earth and Planetary Science Letters, Vol. 264, 1-2, pp. 308-316.MantleGeothermometry
DS200512-0390
2004
Halama, R.Halama, R., Vennnemann, T., Siebel, W., Markl, G.The Gronnedal Ika carbonatite syenite complex, South Greenland: carbonatite formation by liquid immiscibility.Journal of Petrology, Vol. 46, 1-2, pp. 191-217.Europe, GreenlandCarbonatite
DS200712-0402
2007
Halama, R.Halama, R., Joron, J-L., Villemant, B., Markl, G., Treuil, M.Trace element constraints on mantle sources during mid-Proterozoic magmatism: evidence for a link between Gardar and Abitibi mafic rocks.Canadian Journal of Earth Sciences, Vol. 44, 4, pp. 459-478.Canada, Quebec, Europe, GreenlandMagmatism
DS200712-0403
2007
Halama, R.Halama, R., McDonough, W.F., Rudnick, R.L., Keller, J., Klaudius, J.The Li isotopic composition of Oldoinyo Lengai: nature of the mantle sources and lack of isotopic fractionation during carbonatitic petrogenesis.Earth and Planetary Science Letters, Vol. 254, 1-2, Feb. 15, pp. 77-89.Africa, TanzaniaGeochronology, carbonatite
DS200812-0442
2008
Halama, R.Halama, R., McDonough, W.F., Rudnick, R.L., Bell, K.Tracking the lithium isotopic evolution of the mantle using carbonatites.Earth and Planetary Science Letters, Vol. 265, 3-4, Jan. 30, pp. 726-742.MantleCarbonatite
DS201012-0260
2010
Halama, R.Halama, R., Bebout, G.E., John, T., Schenk, V.Nitrogen recycling in subducted oceanic lithosphere: the record in high and ultrahigh pressure metabasaltic rocks.Geochimica et Cosmochimica Acta, Vol. 74, 5, pp. 1636-1652.MantleUHP
DS201112-0403
2011
Halama, R.Halama, R., McDonough, W.F., Rudnick, R.L., Bell, K.The lithium isotopic signature of carbonatites.Goldschmidt Conference 2011, abstract p.965.MantleMagmatism
DS201112-0404
2011
Halama, R.Halama, R., Savov, I.P., Meliksetian, K.The Tezhsar alkaline complex ( Armenia).Peralk-Carb 2011, workshop held Tubingen Germany June 16-18, PosterEurope, ArmeniaAlkalic
DS201112-0405
2011
Halama, R.Halama, R., Timm, J., Herms, P., Hauff, F., Schenk, V.A stable ( Li,O) and radiogenic (Sr, Nd) isotope perspective on metasomatic processes in a subducting slab.Chemical Geology, Vol. 281, 3-4, pp. 151-166.MantleSubduction
DS201212-0280
2012
Halama, R.Halama, R., Bebout, G.E., John, T., Scamberlluri, M.Nitrogen recycling in subducted mantle rocks and implications for the global nitrogen cycle.International Journal of Earth Sciences, in press available 19p.MantleSubduction
DS201710-2239
2017
Halama, R.Li, W-Y., Huang, F., Yu, H-M., Xu, J., Halama, R., Teng, F-Z.Barium isotopic composition of the mantle constrained by carbonatites.Goldschmidt Conference, 1p. AbstractAfrica, Tanzania, east Africa, Canada, Europe, Germany, Greenlandcarbonatite

Abstract: Deep mantle origin and ultra-reducing conditions in podiform chromitite: diamonds, moissanite, and other unusual minerals in podiform chromitites from the Pozanti-Karsanti ophiolite, southern Turkey
DS201908-1786
2019
Halama, R.Li, W-Y., Yu, H-M., Xu, J., Halama, R., Bell, K., Nan, X-Y., Huang, F.Barium isotopic composition of the mantle: constraints from carbonatites.Geochimica et Cosmochimica Acta, in press available doi.org/10.1016 / j.gca.2019.06.041 36p.Africa, Tanzania, Canada, East Africa, Europe, Germany, Greenlanddeposit - Oldoinyo Lengai

Abstract: To investigate the behaviour of Ba isotopes during carbonatite petrogenesis and to explore the possibility of using carbonatites to constrain the Ba isotopic composition of the mantle, we report high-precision Ba isotopic analyses of: (1) carbonatites and associated silicate rocks from the only active carbonatite volcano, Oldoinyo Lengai, Tanzania, and (2) Archean to Cenozoic carbonatites from Canada, East Africa, Germany and Greenland. Carbonatites and associated phonolites and nephelinites from Oldoinyo Lengai have similar ?137/134Ba values that range from +0.01 to +0.03‰, indicating that Ba isotope fractionation during carbonatite petrogenesis is negligible. The limited variation in ?137/134Ba values from ?0.03 to +0.09‰ for most carbonatite samples suggests that their mantle sources have a relatively homogeneous Ba isotopic composition. Based on the carbonatites investigated in this work, the average ?137/134Ba value of their mantle sources is estimated to be +0.04?±?0.06‰ (2SD, n?=?16), which is similar to the average value of +0.05?±?0.06‰ for mid-ocean ridge basalts. The lower ?137/134Ba value of ?0.08‰ in a Canadian sample and higher ?137/134Ba values of +0.14‰ and?+?0.23‰ in two Greenland samples suggest local mantle isotopic heterogeneity that may reflect the incorporation of recycled crustal materials in their sources.
DS202006-0931
2020
Halama, R.Li, W-Ye., Yu, H-M., Xu, J., Halama, R., Bell, K., Nan, X-Y., Huang, F.Barium isotopic composition of the mantle: constraints from carbonatites.Geochimica et Cosmochimica Acta, Vol. 278, pp. 235-243. pdfAfrica, Tanzania, Canada, Europe, Germany, Greenlanddeposit - Oldoinyo Lengai

Abstract: To investigate the behaviour of Ba isotopes during carbonatite petrogenesis and to explore the possibility of using carbonatites to constrain the Ba isotopic composition of the mantle, we report high-precision Ba isotopic analyses of: (1) carbonatites and associated silicate rocks from the only active carbonatite volcano, Oldoinyo Lengai, Tanzania, and (2) Archean to Cenozoic carbonatites from Canada, East Africa, Germany and Greenland. Carbonatites and associated phonolites and nephelinites from Oldoinyo Lengai have similar ?137/134Ba values that range from +0.01 to +0.03‰, indicating that Ba isotope fractionation during carbonatite petrogenesis is negligible. The limited variation in ?137/134Ba values from ?0.03 to +0.09‰ for most carbonatite samples suggests that their mantle sources have a relatively homogeneous Ba isotopic composition. Based on the carbonatites investigated in this work, the average ?137/134Ba value of their mantle sources is estimated to be +0.04?±?0.06‰ (2SD, n?=?16), which is similar to the average value of +0.05?±?0.06‰ for mid-ocean ridge basalts. The lower ?137/134Ba value of ?0.08‰ in a Canadian sample and higher ?137/134Ba values of +0.14‰ and?+?0.23‰ in two Greenland samples suggest local mantle isotopic heterogeneity that may reflect the incorporation of recycled crustal materials in their sources.
DS202007-1160
2020
Halama, R.Li, W-Y., Yu, H-M., Xu, J., Halama, R., Bell, K., Nan, X-Y., Huang, F.Barium isotopic composition of the mantle: constraints from carbonatites.Geochimica et Cosmochimica Acta, Vol. 278, pp. 235-243.Mantlecarbonatite

Abstract: To investigate the behaviour of Ba isotopes during carbonatite petrogenesis and to explore the possibility of using carbonatites to constrain the Ba isotopic composition of the mantle, we report high-precision Ba isotopic analyses of: (1) carbonatites and associated silicate rocks from the only active carbonatite volcano, Oldoinyo Lengai, Tanzania, and (2) Archean to Cenozoic carbonatites from Canada, East Africa, Germany and Greenland. Carbonatites and associated phonolites and nephelinites from Oldoinyo Lengai have similar ?137/134Ba values that range from +0.01 to +0.03‰, indicating that Ba isotope fractionation during carbonatite petrogenesis is negligible. The limited variation in ?137/134Ba values from ?0.03 to +0.09‰ for most carbonatite samples suggests that their mantle sources have a relatively homogeneous Ba isotopic composition. Based on the carbonatites investigated in this work, the average ?137/134Ba value of their mantle sources is estimated to be +0.04?±?0.06‰ (2SD, n?=?16), which is similar to the average value of +0.05?±?0.06‰ for mid-ocean ridge basalts. The lower ?137/134Ba value of ?0.08‰ in a Canadian sample and higher ?137/134Ba values of +0.14‰ and?+?0.23‰ in two Greenland samples suggest local mantle isotopic heterogeneity that may reflect the incorporation of recycled crustal materials in their sources.
DS1991-0018
1991
Halbich, I.W.Altermann, W., Halbich, I.W.Structural history of the southwestern corner of the Kaapvaal Craton And the adjacent Namaqua realm: new observations and a reappraisalPrecambrian Research, Vol. 52, No. 1/2, pp. 133-166Southern AfricaKaapvaal Craton, Tectonics
DS1993-0612
1993
Halbich, I.W.Halbich, I.W.Global geoscience transect 9: Cape Fold belt, Agulhas Bank transect across Gondwana suture, southern AfricaAmerican Geophysical Union (AGU) Map and booklet, 18p. approx. $ 35.00South AfricaLithosphere, Crustal segment
DS1990-0637
1990
Halchuk, S.C.Halchuk, S.C., Mereu, R.F.A seismic investigation of the crust and Moho underlying the Peace RiverArch, CanadaTectonophysics, Vol. 185, No. -12, December 20, pp. 1-20Alberta, SaskatchewanGeophysics -seismics, Peace River Arch
DS1992-0721
1992
Hald, N.Holm, P.M., Gill, R.C.O., Pedersen, A.K., Larsen, J.G., Hald, N.The Icelandic mantle plume: compositional constraints from the West Greenland Tertiary picritesEos Transactions, Vol. 73, No. 14, April 7, supplement abstracts p.336GreenlandPicrites, Mantle plume
DS1993-0694
1993
Hald, N.Holm, P.M., Gill, R.C.O., Pedersen, A.K., Larsen, J.G., Hald, N.The Tertiary picrites of West Greenland: contributions from Icelandic and other sourcesEarth and Planetary Science Letters, Vol. 115, No. 1-4, March pp. 227-244GreenlandPicrites, Alkaline rocks
DS1993-1733
1993
Haldane, J.A.Williams, P.R., Haldane, J.A.An international conference on crustal evolution, metallogeny and exploration of the Eastern GoldfieldsAustralian Geological Survey Extended Abstracts, Record No. 1993/54, 270p. approx. $ 60.00AustraliaNickel, komatiite, Gold, genesis, Supergene, Deposit -Mount Keith, Kambalda Dome, Regolith, laterite, weathering
DS202106-0943
2021
Haldar, C.Illa, B., Reshma, K.S., Kumar, P., Srinagesh, D., Haldar, C., Kumar, S., Mandal, P.Pn tomography and anisotropic study of the Indian Shield and the adjacent regions.Tectonophysics, Vo. 813, 228932 23p. PdfIndiatomography

Abstract: High-resolution P-wave velocity and anisotropy structure of the hitherto elusive uppermost mantle beneath the Indian shield and its surrounding regions are presented to unravel the tectonic imprints in the lithosphere. We inverted high quality 19,500 regional Pn phases from 172 seismological stations for 4780 earthquakes at a distance range of 2° to 15° with a mean apparent Pn velocity of 8.22 km/s. The results suggest that the Pn velocity anomalies with fast anisotropic directions are consistent with the collision environments in the Himalaya, Tibetan Plateau, Tarim Basin, and Burmese arc regions. The higher Pn anomalies along the Himalayan arc explicate the subducting cold Indian lithosphere. The cratonic upper mantle of the Indian shield is characterized by Pn velocity of 8.12-8.42 km/s, while the large part of the central Indian shield has higher mantle-lid velocity of ~8.42 km/s with dominant anisotropic value of 0.2-0.3 km/s (~7.5%) suggesting the presence of mafic ‘lava pillow’ related to the Deccan volcanism. The impressions of the rifts and the mobile belts are conspicuous in the velocity anomaly image indicating their deep seated origin. The Pn anisotropy in the Indian shield exhibits a complex pattern and deviates from the absolute plate motion directions derived from the SKS study, demonstrating the presence of frozen anisotropy in the Indian lithospheric uppermost mantle, due to the large scale tectonic deformation after its breakup from the Gondwanaland. Whereas, Pn and SKS anisotropic observations are well consistent in Tarim basin, Tibetan regions, eastern Himalayan syntaxis and the Burmese arc. The modeled anisotropic Pn clearly manifests a lower velocity anomaly bounded by 85°E and 90°E ridges in the southern Bay of Bengal. Further, 85°E ridge spatially separates the BoB lithosphere into faster and slower regions consistent with the body wave tomography and free-air gravity observation.
DS1970-0920
1974
Haldar, D.Haldar, D., Ghose, D.B.Tectonics of the Kimberlites Around Majhgawan, Madhya PradesIndia Geological Survey Spec. Publishing, PP. 47-48.India, Madhya PradeshBlank
DS200712-0882
2007
Halden, N.Reguir, E., Halden, N., Chakmouradian, A., Yang, P., Zaitsev, A.N.Contrasting evolutionary trends in magnetite from carbonatites and alkaline silicate rocks.Plates, Plumes, and Paradigms, 1p. abstract p. A826.Africa, TanzaniaCarbonatite
DS200812-0946
2008
Halden, N.Reguir, E., Chakhmouradian, A., Halden, N., Malkovets, V., Yang, P.Major and trace element compositional variation of phlogopite from kimberlites and carbonatites as a petrogenetic indicator.9IKC.com, 3p. extended abstractCanada, AfricaGeochemistry - ferromagnesian micas
DS1991-0646
1991
Halden, N.M.Halden, N.M.Existence of a marginal basin with the Circum Superior Belt: geochemical evidence from Churchill Superior Boundary in Manitoba.Precambrian Research, Vol. 49, pp. 167-83.ManitobaGeochemistry, Churchill Superior Boundary Zone
DS1997-0559
1997
Halden, N.M.Jobin-Bevans, L.S., Halden, N.M., Peck, D.C., CameronGeology and oxide mineralization of the Pipe stone Lake anorthosite ManitobaExploration and Mining Geology, Vol. 6, No. 1, pp. 35-61ManitobaTitanium, Vanadium, rare earths, Deposit - Pipestone Lake
DS200812-0192
2008
Halden, N.M.Chakhmouradian, A.H., Bohm, C.O., Demeny, A., Reguir, E.P., Hegger, E., Halden, N.M., Yang, P.Kimberlite from Wekusko Lake, Manitoba: a diamond indicator bearing beforsite and not a kimberlite, after all.9IKC.com, 3p. extended abstractCanada, manitobaCarbonatite
DS200812-0194
2008
Halden, N.M.Chakhmouradian, A.R., Demeny, A., Reguir, E.P., Hegner, E., Halden, N.M., Yang, P.'Kimberlite' from Wekusko Lake, Manitoba: re-assessment and implications for further exploration. Beforsite ( primary dolomite carbonatite)... 'notion' could beManitoba Geological Survey, Nov. 21, 1p. abstract.Canada, ManitobaPetrology - potentially diamondiferous
DS200812-0947
2008
Halden, N.M.Reguir, E.P., Chakhmouradian, A.R., Halden, N.M., Yang, P., Zaitsev, A.N.Early magmatic and reaction induced trends in magnetite from the carbonatites of Kerimasi, Tanzania.Canadian Mineralogist, Vol. 46, 4, August pp.Africa, TanzaniaCarbonatite
DS200912-0623
2009
Halden, N.M.Reguir, E.P., Chakmouradian, A.R., Halden, N.M., Malkovets, V.G., Yang, P.Major and trace element compositional variation of phlogopite from kimberlites and carbonatites as a petrogenetic indicator.Lithos, In press available, 50p.TechnologyGeochemistry - ferromagnesian micas
DS201012-0094
2009
Halden, N.M.Chakhmouradian, A.R., Bohm, C.O., Demeny, A., Reguir, E.P., Hegner, E., Creaser, R.A., Halden, N.M., Yang, P.'Kimberlite' from Wekusko Lake Manitoba: actually a diamond indicator bearing dolomite carbonatite.Lithos, Vol. 112 S pp. 347-357.Canada, ManitobaCarbonatite
DS201012-0619
2010
Halden, N.M.Reguir, E.P., Chakhmouradian, A.R., Halden, N.M., Yang, P.Trace element variations in clinopyroxene from calcite carbonatites.International Mineralogical Association meeting August Budapest, abstract p. 575.Canada, Ontario, Russia, Aldan Shield, Kola PeninsulaCarbonatite
DS201012-0620
2010
Halden, N.M.Reguir, E.P., Chakhmouradian, A.R., Halden, N.M., Yang, P.Contrasting trends of trace element zoning in phlogopite from calcite carbonatites.International Mineralogical Association meeting August Budapest, abstract p. 575.United States, Colorado Plateau, Russia, Canada, Ontario, QuebecCarbonatite
DS1975-0754
1978
Halder, D.Halder, D., Ghosh, D.B.Tectonics of the Kimberlites Around Majhgawan Madhya Pradesh, IndiaGeological Survey of India M.P., No. 34, pp. 1-13.IndiaTectonics, Deposit - Majhgawan
DS202009-1652
2020
Halder, M.Paul, D., Chandra, J., Halder, M.Proterozoic alkaline rocks and carbonatites of Peninsula India: a review.Episodes, Vol. 43, 1, pp. 249-277.Indiacarbonatites

Abstract: The alkaline rocks and carbonatites (ARCs) of the Great Indian Proterozoic belt bear the testimony of tectonic processes operating in the Proterozoic during the continental assembly and breakup of both Columbia and Rodinia. We present a comprehensive review, mainly focused on the petrology, geochemistry, and geochronology of 38 ARCs of Peninsular India, which are mostly concentrated within the Eastern Ghats Mobile Belt and Southern Granulite Terrain. Available geochronologic data reveals three distinct alkaline magmatic phases (2533-2340 Ma, 1510-1242 Ma, 833-572 Ma) and two metamorphic events (950-930 Ma and 570-485 Ma) that correlate with the Grenvillian and Pan-African orogeny events. Whereas clinopyroxene, amphibole, titanite and apatite fractionation seems to have affected the nephelinite, nepheline syenite and syenite, carbonatite is affected by fractionation of calcite, dolomite, ankerite, pyroxene, apatite, magnetite, mica, and pyrochlore. Trace elements and Sr-Nd-Pb-C-O isotopic compositions of these ARCs strongly suggest a subcontinental lithospheric mantle source, that is enriched either by distribution of subducted crustal material or by metasomatism of mantle-derived fluids, for the generation of ARCs. Despite some isotopic variability that can result from crustal contamination, a trend showing enrichment in 87Sr/86Sri (0.702 to 0.708) and depletion in ?Nd(i) (-1.3 to -14.1) over a 2 Gyr duration indicates temporal changes in the lithospheric/asthenospheric source of ARCs, due to periodic enrichment of the source by mantle-derived fluids. ARC generation starts in an intracontinental rift setting (beginning of Wilson cycle). These early-formed ARCs are carriedto 100 km depths during continental collision (termination stage of Wilson cycle) and undergo extensive melting because of renewed rifting along suture zones to form new generation of ARCs.
DS1991-0647
1991
Halderman, T.P.Halderman, T.P., Davis, P.M.Qp beneath the Rio Grande and East African Rift ZonesJournal of Geophysical Research, Vol. 96, No. B6, June 10, pp. 10, 113-10, 128Colorado Plateau, East Africa, TanzaniaGeophysics, Tectonics
DS200912-0560
2008
Hale, A.OzBench, M., Regenauerlieb, K., Stegman, D.R., Morra, G., Farrington, R., Hale, A., May, D.A., Freeman, J.A model comparison study of large scale mantle lithosphere dynamics driven by subduction.Physics of the Earth and Planetary Interiors, Vol. 171, 1-4, pp. 224-234.MantleTectonics
DS1995-0725
1995
Hale, J.R.Hale, J.R., Friberg, L.M.Petrogenesis of New England-Quebec lamprophyres from Hills borough Merrimack and Rockingham Counties.Geological Society of America (GSA) Abstracts, Vol. 27, No. 1, Feb. p. 51.GlobalLamprophyres
DS1992-1548
1992
Hale, M.Thompson, M., Hale, M., Coles, B.Geochemical reconnaissance using stream-sediment pebble coatings and laser ablation ICP-AESTransactions Institute of Mining and Metallurgy (IMM), Vol. 100, pp. B9-B14GlobalGeochemistry, ICP-AES
DS1994-0700
1994
Hale, M.Hale, M., Plant, J.A.Drainage geochemistryElsevier, Handbook of exploration geochemistry, Vol. 6, 780pGlobalGeochemistry -drainage, Book -table of contents
DS200612-1104
2006
hale, M.Porwal, A., Carranza, E.J.M., hale, M.Bayesian network classifiers for mineral potential mapping.Computers & Geoscience, Vol. 32, 1, Feb. pp. 1-16.India, Aravalli ProvinceGIS - not specific to diamonds
DS2000-0379
2000
Hale, M. editor.Hale, M. editor.Geochemical remote sensing of the Sub-surface.Mentions diamonds on p. 119, 303, 305, 347.Elsevier Handbook Exploration Geochemistry, Vol. 7GlobalRemote sensing, groundwater, electrochemical, helium
DS1993-0613
1993
Hale-Erlich, W.S.Hale-Erlich, W.S., Coleman, J.L. Jr.Ouachita-Appalachian juncture:a Paleozoic transpressional zone in the southeastern United States (US)American Association of Petroleum Geologists Bulletin, Vol. 77, No. 4, April, pp. 552-568ArkansasStructure, Gondwana, North American Craton
DS200512-1156
2005
Halenius, U.Vuorinen, J.H., Halenius, U.Nb Zr and LREE rich titanite from the Alno alkaline complex: crystal chemistry and its importance as a petrogenetic indicator.Lithos, Vol. 83, 1-2, July pp.128-142.Europe, SwedenMelteigite, ijolite
DS200512-1157
2005
Halenius, U.Vuorinen, J.H., Halenius, U., Whitehouse, M.J., Mansfeld, J., Skelton, A.D.L.Compositional variations (major and trace elements) of clinopyroxene and Ti and radite from pyroxenite, ijolite and nepheline syenite, Alno Island, Sweden.Lithos, Vol. 81, 1-4, April pp. 55-77.Europe, Sweden, Alno IslandGeochemistry, melteigite
DS1991-0648
1991
Hales, A.L.Hales, A.L.Upper mantle models and the thickness of the continental lithosphereGeophys. Journal of International, Vol. 105, No. 2, May pp. 355-364GlobalMantle, Lithosphere
DS1900-0753
1909
Hales, F.C.Hales, F.C.Diamonds at Echunga. History of the QuestRegister., JUNE 17TH.Australia, South AustraliaDiamond
DS1900-0754
1909
Hales, F.C.Hales, F.C.Diamonds at Echunga. a Visit to the FieldRegister., Oct. 5TH.Australia, South AustraliaDiamond
DS1989-0571
1989
Hales, M.J.Hales, M.J.Reading mine financial statementsMine Financing seminar, held April 17th. Toronto, Database # 17804GlobalEconomics, Financial statements
DS201412-0220
2014
Halevy, I.Eiler, J.M., Berquist, B., Bourg, I., Cartigny, P., Farquhar, J., Gagnon, A., Guo, W., Halevy, I., Hofman, A., larson, T.E., Levin, N., Schauble, E.A., Stolper, D.Frontiers of stable isotope geoscience.Chemical Geology, Vol. 372, pp. 119-143.TechnologyReview of isotopes
DS1986-0585
1986
Haley, B.R.Morris, E.M., Stone, C.G., Howard, M.J., Haley, B.R.Geology and petrology of the Prairies Creek intrusive,Mufreesboro, ArkansawIn: Sedimentary and Igneous rocks of Ouachita Mountains of Arkansaw; A, Vol. 86-2, pp. 99-106ArkansasBlank
DS1986-0785
1986
Haley, B.R.Stone, C.G., Howard, M.J., Haley, B.R.Stop description First Day: Southwestern Arkansaw, MurfreesboroIn: Sedimentary and Igneous rocks of Ouachita Mountains of Arkansaw; A, Vol. 86-2, pp. 1-5ArkansasBlank
DS1993-0614
1993
Haley, B.R.Haley, B.R.Geologic map of ArkansawU.s.geological Survey, Map 1: 500, 000 1 sheet colour $ 7.30ArkansasMap -geology
DS201812-2815
2018
Haley, W.Haley, W.Diavik diamond mine update.2018 Yellowknife Geoscience Forum , p. 27-28.Canada, Northwest Territoriesdeposit - Diavik

Abstract: Over the past year, the Diavik Diamond Mine continued to make significant contributions through its mining operation on Lac de Gras, NWT. The mine is the second largest diamond mine in the NWT (and in Canada), but the largest producer of Canadian rough diamonds. Production has been augmented in 2018 with the official opening and start of mining from a new ore body called A-21.
DS200512-0320
2004
Halicz, L.Gazit, O., Navon, O., Halicz, L., Stein, M.The petrogenesis and thermal history of lower crustal xenoliths from Karnei-hitin, northern Israel.Israel Geological Society, p. 34. 1p. Ingenta 1045591078.Europe, IsraelGeothermometry
DS202106-0940
2021
Halim, A.Y.Halim, A.Y., Kelloway, S.J., Marjo, C., Regenauer-Lieb. K.A Hylogger-Itrax core-scanner comparison for multi-scale high resolution petrophysical characterization workflow. * not specific to diamondsApplied Chemistry, in press available, 18p. PdfGlobalHylogger

Abstract: Recent advances in core scanning technologies allow for fast and non-destructive chemical and mineral profiling of rock samples for mineral services and oil and gas exploration. The aim of these automatic core scan methods is to obtain valuable information for profiling drill core cuttings with minimum sample preparation at relatively high speed. In the last decade, a core logging system using an automated infrared-based hyperspectral line-profiling system, Hylogger, has progressed to become an effective standard for the Australian mineral exploration industry. Its results are used to rapidly obtain mineralogical information allowing the characterisation of different geological formations in near real-time. The interpretation of Hylogger data can be challenging for certain complex mineral mixtures. Here we solve this issue by augmenting the Hylogger interpretation with elemental analysis using the Itrax core scanner equipped with an X-ray fluorescence (XRF) spectrometer. The Itrax core scanner produces high-resolution elemental data of major, minor and trace elements in one dimension. We analyse and compare the Hylogger and Itrax data, with each dataset independently cross-checked using X-ray diffraction (XRD) and thin-section petrology and propose a workflow harvesting the mutual strengths of each method. The recommended workflow consists of rapid screening using Hylogger and XRF analysis, providing new insights into the mineralogy based on comparative multiscale element-mineral analysis. The workflow is tested on four different types of volcanic rock samples, where infrared spectra of individual minerals overlap. We tested tuffaceous ash, basaltic, dolerite, and basaltic-andesitic rocks. Our study shows that embedding Itrax core scanner data into the workflow provides a solution to the challenges of interpreting Hylogger data in complex mineral samples. The proposed workflow provides a total system for multiscale, high-resolution petrophysical analyses and rock property modelling.
DS1998-0561
1998
Halim, N.Halim, N., Kravchinsky, V., et al.A paleomagnetic study from the Mongol - Okhotsk region: rotated early Cretaceous volcanics and remagnetized..Earth and Plan. Sci. Lett, Vol. 159, pp. 133-45GlobalOkhotsk region, suture zones, tectonics, Fold belts
DS2001-1286
2001
Halim, N.Yokoyama, M., Liu, Y., Halim, N., Otofuji, Y.Paleomagnetic study of Upper Jurassic rocks from Sichuan Basin: tectonic aspects for collision....Earth and Planetary Science Letters, Vol. 193, No. 3-4, pp.273-85.ChinaTectonics, Block - Yangtze and North China
DS1999-0396
1999
HalkoahoLatypov, R.M., Mitrofanov, Alapietti, HalkoahoPetrology of the lower layered horizon of the Western Pansky TundraIntrusion, Kola Peninsula.Petrology, Vol. 7, No. 5, pp. 482-508.Russia, Kola PeninsulaLayered intrusion - not specific to diamonds
DS1994-1163
1994
HallMeet, J.G., Hargraves, R.B., Van der Voo, R., HallPaleomagnetic and 40Ar/39Ar studies of Late Kebaran intrusives in Burundi:Proterozoic supercontinentsJournal of Geology, Vol. 102, No. 6, Nov. pp. 621-638GlobalGeochronology, Proterozoic, Rodinia
DS1998-1174
1998
HallPokhilenko, N.P., McDonald, J.A., Melnyk, Hall, ShimizuKimberlites of Camsell Lake field and some features of construction and composition of lithosphere roots...7th. Kimberlite Conference abstract, pp. 699-701.Northwest TerritoriesCraton - Slave, Deposit - Camsell Lake
DS2000-0937
2000
HallStreepey, M.M., Van der Pluijn, B.A., Essene, E.J., HallLate Proterozoic (ca 930 Ma) extension in eastern LaurentiaGeological Society of America (GSA) Bulletin., Vol. 112, No. 10, Oct. pp. 1522-30.GlobalGrenville Province, calcium, Geochronology
DS2001-0347
2001
HallFunck, T., Louden, Hall, Wardle, Salisbury, ReidSynthesis of the Escoot 1996 refraction seismic studies in the Torngat Orogen.Geological Association of Canada (GAC) Annual Meeting Abstracts, Vol. 26, p.48, abstract.Quebec, Labrador, UngavaGeophysics - seismics, ESCOOT.
DS2001-0934
2001
HallPokhilenko, N.P., McDonald, Hall, SobolevAbnormally thick Cambrian lithosphere of the southeast Slave Craton evidence from crystalline inclusions ..Slave-Kaapvaal Workshop, Sept. Ottawa, 3p. abstractNorthwest TerritoriesDiamonds and pyrope compositions - kimberlites, Deposit - Snap Lake
DS2001-0935
2001
HallPokhilenko, N.P., Sobolev, McDonald, Hall, YefimovaCrystalline inclusions in diamonds from kimberlites of the Snap lake area: new evidence anomalous lithosphereDoklady Academy of Sciences, Vol. 381, No. 7, Sept/Oct. pp. 806-11.Northwest TerritoriesDiamond - inclusions, Deposit - Snap Lake
DS2001-1183
2001
HallVan der Pluijm, B.A., Hall, Vrolljk, Pevear, CoveyThe dating of shallow faults in the Earth's crustNature, Vol. 412, July 12, pp. 172-5.British Columbia, CordilleraStructure
DS2001-1216
2001
HallWalsh, K.L., Siegfried, P., Hall, HughesTectonic implications of four recently discovered carbonatites along the Zambesi Escarpment Fault.Journal of South African Earth Sciences, Vol. 32, No. 1, p. A 36-7.(abs)ZimbabweCarbonatite, Marindagomo Complex, Dande-Doma
DS200612-0527
2006
HallHanson, R.E., Harmer, R.E., Blenkinsop, T.G., Bullen, D.S., Dalziel, Gose, Hall, Kampunzu, Key, MukwakwamiMesoproterozoic intraplate magmatism in the Kalahari Craton: a review.Journal of African Earth Sciences, Vol. 46, 1-2, pp. 141-167.Africa, South AfricaMagmatism
DS200612-0528
2006
HallHanson, R.E., Harmer,Blenkinsop, Bullen, Dalziel, Gose, Hall, Kampunzu, Key, Mukwakwami, Munyaniwa, Pancake, Seidel, WardMesoproterozoic intraplate magmatism in the Kalahari Craton: a review.Journal of African Earth Sciences, In press available,Africa, South AfricaAlkaline rocks, carbonatite, Premier kimberlite cluster
DS1988-0281
1988
Hall, A.Hall, A.Crustal contamination of minette magmas, evidence from their ammoniumcontentsNeues Jahrb. F. Mineralogie, Monatshefte, Vol. 1988, No. 3, pp. 137-143GlobalGeochemistry, Minettes
DS1988-0282
1988
Hall, A.Hall, A.Crustal contamination of minette magmas: evidence from theirammoniumcontentsNeues Jahrbuch f?r Mineralogie Monatsch, No. 3, pp. 137-143GlobalMinette
DS1998-0977
1998
Hall, A.McDonald, J.A., Pokhilenko, N., Melnyk, W., Hall, A.Camsell Lake kimberlites, Slave Province, northwest TerritoriesGeological Society of America (GSA) Annual Meeting, abstract. only, p.A245.Northwest TerritoriesExploration - history outline, Deposit - Camsell Lake, Snap Lake, dike
DS2002-1032
2002
Hall, A.McDonald, J.A., Pokhilenko, N., Melnyk, W., Hall, A.Camsell Lake kimberlites, Slave Province, Northwest TerritoriesCanadian Institute of Mining and Metallurgy, Vol. 53, Industrial Minerals of Canada, pp. 361-2.Northwest TerritoriesHistory - exploration
DS1995-0726
1995
Hall, A.C.Hall, A.C.Nothing down.... experiences in South America from 1952-1957Society for Mining, Metallurgy and Exploration (SME) Foundation, 168p. approx. $ 25.00South America, Peru, BoliviaBook -ad, History
DS1984-0332
1984
Hall, A.E.Hall, A.E., Smith, C.B.Lamproite Diamonds - Are They Different?University of Western Australia - Special Publication, No. 8, PP. 167-212.AustraliaOccurrence
DS1984-0333
1984
Hall, A.E.Hall, A.E., Smith, C.B.Lamproite Diamonds Are They Different?Kimberlite Occurrence And Origin A Basis For Conceptual Mode, PP. 21-22. (abstract.)Australia, Western Australia, Kimberley RegionDiamond Morphology, Nodules, Mineralogy, Argyle
DS1986-0400
1986
Hall, A.E.Jaques, A.L., Sheraton, J.W., Hall, A.E., Smith, C.B. , Sun, S.S.Composition of crystalline inclusions and C-isotopic composition of Argyle and Ellendale diamonds #2Geological Society of Australia Abstract Series, No. 16, pp. 426-428. (Abstract)AustraliaMineralogy
DS1986-0401
1986
Hall, A.E.Jaques, A.L., Sheraton, J.W., Hall, A.E., Smith, C.B., Sun, S-S.Composition of crystalline inclusions and C-isotopic composition of Argyle and Ellendale diamonds #1Proceedings of the Fourth International Kimberlite Conference, Held, No. 16, pp. 426-428AustraliaDiamond inclusions
DS1986-0506
1986
Hall, A.E.Lucas, H., Ramsay, R., Hall, A.E., Smith, C.B., Sobolev, N.V.Garnets from West Australian kimberlites and associated rocksProceedings of the Fourth International Kimberlite Conference, Held Perth, Australia, No. 16, pp. 270-272AustraliaBlank
DS1989-0705
1989
Hall, A.E.Jaques, A.L., Hall, A.E., Sheraton, J.W., Smith, C.B., Sun, S-S.Composition of crystalline inclusions and C-isotopic composition of Argyle and Ellendale diamondsGeological Society of Australia Inc. Blackwell Scientific Publishing, Special, No. 14, Vol. 2, pp. 966-989AustraliaDeposit -Argyle, Ellendale, Diamond inclusions
DS1989-0706
1989
Hall, A.E.Jaques, A.L., Hall, A.E., Sheraton, J.W., Smith, Chris B., Sun, S-S.Nature and origin of West Australian diamonds: evidence from mineral inclusions and C-isotopic compositionsMinpet 89 Mineralogy And Petrology Symposium Held Sydney, February, p. 11. AbstractAustraliaDiamond morphology, Inclusions
DS1989-0901
1989
Hall, A.E.Lucas, H., Ramsay, R.R., Hall, A.E., Smith, C.B., Sobolev, N.V.Garnets from Western Australian kimberlites and related rocksGeological Society of Australia Inc. Blackwell Scientific Publishing, Special, No. 14, Vol. 2, pp. 809-819AustraliaLamproite, Heavy minerals, Geochemist
DS1991-0779
1991
Hall, A.E.Jacques, A.L., Hall, A.E., Sheraton, J., Smith, C.B., Roksandic, Z.Peridotitic paragenesis planar octahedral diamonds from the Ellendale lamproite pipes, western AustraliaProceedings of Fifth International Kimberlite Conference held Araxa June 1991, Servico Geologico do Brasil (CPRM) Special, pp. 202-204AustraliaEllendale, Carbon isotope, Diamond morphology
DS1991-1608
1991
Hall, A.E.Smith, C.B., Haebig, A.E., Hall, A.E.Patterns of diamond and kimberlite indicator mineral dispersal in the Kimberley region, western AustraliaProceedings of Fifth International Kimberlite Conference held Araxa June 1991, Servico Geologico do Brasil (CPRM) Special, pp. 376-379AustraliaHeavy mineral sampling, weathering, Lamproites, kimberlites, Argyle type diamonds
DS1991-1609
1991
Hall, A.E.Smith, C.B., Lucas, H., Hall, A.E., Ramsey, R.R.Diamond prospectivity from indicator mineralogy: a western AustralianperspectiveProceedings of Fifth International Kimberlite Conference held Araxa June 1991, Servico Geologico do Brasil (CPRM) Special, pp. 380-382AustraliaHeavy mineral sampling, Hadfields, Pteropus, Argyle, Ellendale, peridotite, harzburgite, lherzolite, Skerring
DS1994-0838
1994
Hall, A.E.Jaques, A.L., Hall, A.E., Sheraton, J., Smith, C.B., Roksandic, Z.Peridotitic planar octahedral diamonds from the Ellendale lamproite Western Australia.Proceedings of Fifth International Kimberlite Conference, Vol. 2, pp. 69-77.AustraliaDiamond morphology, Deposit -Ellendale
DS1994-1628
1994
Hall, A.E.Smith, C.B., Lucas, H., Hall, A.E., Ramsay, R.R.Diamond prospectivity and indicator mineral chemistry: a western Australianperspective.Proceedings of Fifth International Kimberlite Conference, Vol. 2, pp. 312-318.AustraliaGeochemistry, Diamond exploration
DS2002-1328
2002
Hall, A.E.Reutskii, V.N., Pokhilenko, N.P., Hall, A.E., Sobolev, N.V.Polygenous character of diamonds from kimberlites of the Snap lake region ( SlaveDoklady Earth Sciences, Vol. 386, 7, Sept-Oct.pp. 791-4.Northwest TerritoriesDiamond - morphology, Deposit - Snap Lake
DS2003-1093
2003
Hall, A.E.Pokhilenko, N.P., McDonald, J.A., Sobolev, N.V., Reutsky, V.N., Hall, A.E.Crystalline inclusions and C isotope composition of diamonds from the Snap lake/King8 Ikc Www.venuewest.com/8ikc/program.htm, Session 3, AbstractNorthwest TerritoriesDiamonds - geochronology, Deposit - Snap Lake
DS200412-1564
2003
Hall, A.E.Pokhilenko, N.P., McDonald, J.A., Sobolev, N.V., Reutsky, V.N., Hall, A.E., Logvinova, A.M., Reimers, L.F.Crystalline inclusions and C isotope composition of diamonds from the Snap lake/King Lake kimberlite dyke system: evidence for a8 IKC Program, Session 3, AbstractCanada, Northwest TerritoriesDiamonds - geochronology Deposit - Snap Lake
DS200412-1566
2004
Hall, A.E.Pokhilenko, N.P., Sobolev, N.V., Reutsky, V.N., Hall, A.E., Taylor, L.A.Crystalline inclusions and C isotope ratios in diamonds from the Snap Lake/King Lake kimberlite dyke system: evidence of ultradeLithos, Vol. 77, 1-4, Sept. pp. 57-67.Canada, Northwest TerritoriesDiamond inclusions, Carbon isotopes
DS200912-0702
2009
Hall, A.E.Smith, C.B., Bulanova, G.P., Kohn, S.C., Milledge, H.J., Hall, A.E., Griffin, B.J., Pearson, D.G.Nature and genesis of Kalimantan diamonds.Lithos, In press available, 38p.Indonesia, KalimantanAlluvials, diamond morphology
DS201812-2885
2018
Hall, A.E.Smith, C.B., Atkinson, W.J., Tyler, E.W.J., Hall, A.E., Macdonald, I.Argyle deposit: The discovery of the Argyle pipe, western Australia: the world's first lamproite-hosted diamond mine.Society of Economic Geology Geoscience and Exploration of the Argyle, Bunder, Diavik, and Murowa Diamond Deposits, Special Publication no. 20, pp. 49-64.Australia, western Australiadeposit - Argyle
DS1900-0250
1904
Hall, A.L.Hall, A.L.Die Bergindustrie. Transvaal im 1902-1903Zeitschr. F. Prakt. Geol., Vol. 12, PP. 187-188.Africa, South AfricaCurrent Activities
DS1900-0251
1904
Hall, A.L.Hall, A.L.Ueber Einige Neue Diamant lagerstatten TransvaalsZeitschr. F. Prakt. Geol., Vol. 12, PP. 193-199. ALSO: GEOL. CENTRALL BL., Vol. 6, PP.Africa, South AfricaPremier Mine
DS1900-0262
1904
Hall, A.L.Kynaston, H., Hall, A.L.Diamondiferous DepositsTransvaal Geological Survey Annual Report For 1903, PP. 43-47.South Africa, TransvaalDiamond Occurrences, Mineral Resources
DS1900-0321
1905
Hall, A.L.Hall, A.L.The Geology of Pretoria and Neighbourhood. an Explanation Of the Geological Map of the Environs of Pretoria.Pretoria: Transvaal Mines Department Geological Survey Memoir., No. 1, 55P.Africa, South AfricaRegional Geology, Premier Mine
DS1900-0337
1905
Hall, A.L.Kynaston, H., Hall, A.L.The Geological Features of the Diamond Mines of the Pretoria District.South African Association Advanced Science, Vol. 1, PP. 182-196.South Africa, TransvaalPremier Mine, Kimberlite Mines And Deposits
DS1900-0408
1906
Hall, A.L.Hall, A.L., Steart, F.A.On Folding and Faulting in the Pretoria Series and the Dolomite.Geological Society of South Africa Transactions, Vol. 8, PP. 7-15.Africa, South AfricaGeology, Structure
DS1900-0559
1907
Hall, A.L.Hall, A.L., Trevor, T.G.Serpentine Rocks Occurring North of PietersburgGeological Society of South Africa Proceedings, Vol. 9, P. XLVI.Africa, South AfricaDiamond Occurrence, Petrography
DS1920-0465
1929
Hall, A.L.Rogers, A.W., Hall, A.L., Wagner, P.A., Haughton, S.H.The Union of South AfricaHeidelberg: C. Winters Universitaetsbuchhandlung, 232P.South AfricaRegional Geology, Kimberley
DS1930-0192
1935
Hall, A.L.Hall, A.L.Mineral Wealth in the Outside Districts of the TransvaalGeological Society of South Africa Transactions, Vol. 37, PP. 171-204.South AfricaMineral Resources
DS1985-0258
1985
Hall, A.M.Hall, A.M., Thomas, M.F., Thorp, M.B.Later Quaternary Alluvial Placer Development in the Humid Tropics: the Case of the Birim Diamond Placer, Ghana.Journal of the Geological Society of London., Vol. 142, PP. 777-787.West Africa, GhanaGeomorphology, Stratigraphy, Diamond Distribution, Sorting Mech
DS202103-0386
2021
Hall, A.M.Hall, A.M., Putkinen, N., Hietala,, S., Lindsberg, E., Holma, M.Ultra-slow cratonic denudation in Finland since 1.5 Ga indicated by tiered unconformities and impact structures.Precambrian Research, Vol. 352, 106000, 18p. PdfEurope, Finlandgeothermometry

Abstract: The Earth’s cratons are traditionally regarded as tectonically stable cores that were episodically buried by thin sedimentary covers. Cratonic crust in southern Finland holds seven post-1.7 Ga tiered unconformities, with remnants of former sedimentary covers. We use the geometries of the tiered unconformities, along with previously dated impact structures and kimberlite and carbonatite pipes, to reconstruct the erosion and burial history of the craton and to derive estimates of depths of erosion in basement and former sedimentary rocks. The close vertical spacing (<200 m) of the unconformities and the survival of small (D ? 5 km) Neoproterozoic and Early Palaeozoic impact structures indicate minor later erosion. Average erosion rates (<2.5 m/Ma) in basement and cover are amongst the lowest reported on Earth. Ultra-slow erosion has allowed the persistence in basement fractures of Phanerozoic fracture coatings and Palaeogene groundwater and microbiomes. Maximum thicknesses of foreland basin sediments in Finland during the Sveconorwegian and Caledonide orogenies are estimated as ~1.0 km and <0.68-1.0 km, respectively. Estimated losses of sedimentary cover derived from apatite fission track thermochronology are higher by factors of at least 2 to 4. A dynamic epeirogenic history of the craton in Finland, with kilometre-scale burial and exhumation, proposed in recent thermochronological models is not supported by other geological proxies. Ultra-slow erosion rates in southern Finland reflect long term tectonic stability and burial of the craton surface for a total of ~1.0 Ga beneath generally thin sedimentary cover.
DS1996-0158
1996
Hall, C.Boundy, T.M., Essene, E.J., Hall, C., Austrheim, HallidayRapid exhumation of lower crust during continent-continent collision and Late extension...Geological Society of America (GSA) Bulletin., Vol. 108, No. 11, Nov. pp. 1425-37.NorwayCaledonian Orogeny, Geochronology
DS1996-0584
1996
Hall, C.Hall, C.Landmarks in the Natural History Museum's acquisition of gemsMineral Industry International., No. April, pp.GlobalHistory MuseuM., Collections -Pain, Church, Matthews
DS200512-0391
2004
Hall, C.Hall, C., Godfried, H.Diamond anvils.Rough Diamond Review, No. 6, Sept.pp.Diamond anvil
DS1995-2080
1995
Hall, C.E.Worley, B.A., Cooper, A.F., Hall, C.E.Petrogenesis of carbonate bearing nepheline syenites and carbonatites From southern Victoria Land.Lithos, Vol. 35, pp. 193-199.GlobalGeochemistry, Carbonatite, Calcite-graphite
DS2003-0532
2003
Hall, C.E.Hall, C.E., Gurnis, M., Sdrolias, M., Lavier, L., Muller, R.D.Catastrophic initiation of subduction following forced convergence across fractureEarth and Planetary Science Letters, Vol. 212, 1-2, pp. 15-30.MantleBlank
DS200412-0762
2003
Hall, C.E.Hall, C.E., Gurnis, M., Sdrolias, M., Lavier, L., Muller, R.D.Catastrophic initiation of subduction following forced convergence across fracture zones.Earth and Planetary Science Letters, Vol. 212, 1-2, pp. 15-30.MantleTectonics
DS200612-0767
2006
Hall, C.E.Lassak, T.M., Fouch, M.J., Hall, C.E., Kaminski, E.Seismic characterization of mantle flow in subduction systems: can we resolve a hydrated mantle wedge?Earth and Planetary Science Letters, Vol. 243, 3-4, March 30, pp. 632-649.MantleSubduction, water
DS1985-0261
1985
Hall, C.M.Hanes, J.A., York, D., Hall, C.M.An 40 Ar-39 Ar geochronological and electron microprobe investigation of an Archean pyroxenite and its bearing on ancient atmospheric compositions.Canadian Journal of Earth Sciences, Vol. 22, pp. 947-58.MantleUltramafic Rocks - Not Specific To Diamonds, Argon, Geochronology
DS1997-1301
1997
Hall, C.M.Zhao, D., Essene, E.J., Zhang, Y., Hall, C.M., Wang, L.Newly discovered kimberlites and mantle xenoliths from Somerset Island and Brodeur Peninsula: pressure, tempnorthwest Territories Geology Division, DIAND., EGS 199-05, $ 5.50Northwest Territories, Somerset Island, Brodeur PeninsulaGeochronology, oxygen fugacity, volatile content
DS1993-0615
1993
Hall, C.R.J.Hall, C.R.J.Development capital finance for smaller companiesMining Industry International, No. 1010, January pp. 17-18OntarioEconomics, Ore reserves, Ateba
DS2003-0206
2003
Hall, D.Canil, D., Schulze, D.J., Hall, D., Hearne, B.J.Jr., Milliken, S.M.Lithospheric roots beneath western Laurentia: the geochemical signal in mantle garnetsCanadian Journal of Earth Sciences, Vol. 40, 8, Aug. pp. 1027-51.Wyoming, British ColumbiaTectonics,geochemistry, geochronology, Ni thermometry
DS200412-0266
2003
Hall, D.Canil, D., Schulze, D.J., Hall, D., Hearne, B.J.Jr., Milliken, S.M.Lithospheric roots beneath western Laurentia: the geochemical signal in mantle garnets.Canadian Journal of Earth Sciences, Vol. 40, 8, Aug. pp. 1027-51.United States, WyomingTectonics,geochemistry, geochronology, Ni thermometry
DS1986-0332
1986
Hall, D.C.Hall, D.C., Helmsaedt, H., Schulze, D.J.The Cross diatreme: a kimberlite in a young orogenic beltProceedings of the Fourth International Kimberlite Conference, Held Perth, Australia, No. 16, pp. 30-32British ColumbiaPetrography
DS1987-0270
1987
Hall, D.C.Hall, D.C., Helmstaedt, H., Schulze, D.J.The Cross diatreme, British Columbia, Canada: a kimberlite in a young orogenic belt #2Fourth International Kimberlite Conference, 26p. 7 figsBritish ColumbiaCanada, Diatreme
DS1988-0298
1988
Hall, D.C.Helmstaedt, H.H., Mott, J.A., Hall, D.C., Schulze, D.J., DixonStratigraphic and structural setting of intrusive breccia diatremes In the White River-Bulletin River area, southeastern British ColumbiaBritish Columbia Department of Mines, Geological Fieldwork 1987, Paper 1988-1, pp. 363-368British ColumbiaBlank
DS1989-0572
1989
Hall, D.C.Hall, D.C., Helmstaedt, H., Schulze, D.J.The Cross diatreme, British Columbia, Canada: akimberlite in a young orogenic belt #1Geological Society of Australia Inc. Blackwell Scientific Publishing, No. 14, Vol. 1, pp. 97-108British ColumbiaDiatreme, Cross
DS1991-0649
1991
Hall, D.C.Hall, D.C.A petrological investigation of the Cross kimberlite occurrence, southeastern British ColumbiaPh.d. thesis, Queen's University, 536p. fiche only availableBritish ColumbiaCross occurrence, Petrology
DS1992-1702
1992
Hall, D.C.Wynne, P.J., Irving, E., Schulz, D.J., Hall, D.C., Helmstaedt, H.H.Paleomagnetism and age of three Canadian Rocky Mountain diatremesCanadian Journal of Earth Sciences, Vol. 29, No. 1, January pp. 35-47British ColumbiaDiatremes -Cross, Blackfoot, HP pipe, Paleomagnetics
DS200512-0392
2005
Hall, D.C.Hall, D.C.Exotic metasomatic oxides in a rutile nodule from the Orapa kimberlite, Botswana.GAC Annual Meeting Halifax May 15-19, Abstract 1p.Africa, BotswanaOrapa - mineralogy
DS1960-1168
1969
Hall, D.H.Mcgrath, P.H., Hall, D.H.Crustal Structure in Northwestern Ontario: Regional Magnetic Anomalies.Canadian Journal of Earth Sciences, Vol. 6, PP. 101-107.GlobalMid-continent, Geophysics
DS1970-0303
1971
Hall, D.H.Hall, D.H.Geophysical Determination of Deep Crustal Structure in Manitoba.Geological Association of Canada (GAC) SPECIAL PAPER., No. 9, PP. 83-88.GlobalMid-continent, Geophysics
DS1970-0706
1973
Hall, D.H.Hall, D.H.Deep Seismic Crustal Studies in ManitobaSeismological Soc. American Bulletin., Vol. 63, PP. 885-950.GlobalMid-continent, Geophysics
DS1970-0921
1974
Hall, D.H.Hall, D.H.Long Wavelength Aeromagnetic Anomalies and Deep Crustal Magnetization in Manitoba and Northwestern Ontario.Geophysics, Vol. 40, PP. 403-430.GlobalMid-continent, Geophysics
DS200612-0522
2006
Hall, D.J.Hall, D.J.Risk in exploration: managing for success.SEG 2006 Conference, Wealth Creation in the Minerals Industry, May 14-16, Keystone Colorado USA, Abtract Volume POSTER only p. 139-143. ( 5p.)GlobalEconomics - risk strategies
DS1988-0649
1988
Hall, D.R.Sneddon, M.V., Hall, D.R.Polycrystalline diamond, manufacture, wear mechanism sand implications for bit designJournal of Petr. Technology, Vol. 40, No. 12, pp. 1593-1601GlobalDiamond Application, CVD.
DS201604-0610
2016
Hall, E.M.G.Hall, E.M.G., McClenaghan, M.B., Page, L.Application of portable XRF to the direct analysis of till samples from various deposit types in Canada.Geochemistry, Exploration, Environment, Analysis, Vol. 16, pp. 62-84.Canada, Northwest TerritoriesKimberlite - Triple B mentioned

Abstract: In this study, results by direct portable XRF (‘pXRF’) on unsieved till samples were compared with those by established laboratory methods (aqua regia or fusion ICP-MS and ICP-ES) on the <0.063-mm fraction to determine if the application of direct pXRF in the field would serve as an acceptable guide for immediate follow-up work. Four test sites in Canada were chosen: the Halfmile Lake Cu-Pb-Zn VMS deposit; the intrusion-hosted W-Mo Sisson deposit; a Pb-Zn Mississippi Valley-type (MVT) deposit in the Pine Point district; and the Triple B kimberlite. Unsieved till samples from the GSC archive collection were used for this study and included samples from background areas, immediately overlying, and at various distances down-ice of each deposit. Ziploc® and Whirl-Pak® bags that were used to contain the samples in the field were tested for their properties of X-ray attenuation and contamination. In general, the performance of pXRF in the four test areas was very good where concentrations of elements of interest (indicator or pathfinder elements) were substantially above detection limits by this technique (in the low ppm range for many elements). The following elements, shown to be useful indicator elements (important constituents of the ore/commodity) or pathfinder elements (those associated with the commodity elements) by the established methodology, showed similar patterns by pXRF on the unsieved material: Zn, Cu, Pb, and As at Halfmile Lake; W, Mo, Cu, Zn, Pb, and As at the Sisson deposit; Zn, Pb, and Fe at Pine Point; and Ca, Sr, Cr, and Ni at Triple B. Pathfinder elements whose concentrations were too low for determination by pXRF include: Ag and Sb at Halfmile Lake; Ag and Cd at Sisson; Cd, S, and Se at Pine Point; and Co, Mg, P, U, and Th at Triple B. The high background for Bi by pXRF, equivalent to c. 50?ppm, and its noisy signal precluded its use at Halfmile Lake and Sisson. Elements which tended to show poor precision (three analyses each sample) by pXRF in some samples due to sample heterogeneity include Sn, V, and W. Mercury was erroneously reported for the majority of samples in the low ppm range by pXRF whereas its concentration in fact was in the low ppb range. Several Pb-, Zn- (c. 1% Pb, Zn) and Fe-rich (up to 16% Fe) samples demonstrated spectral interferences by: Pb on As, Th and Se; Zn on Cu; and Fe on Co. Results for six till samples analysed in Ziploc® and Whirl-Pak® bags showed that Ziploc® absorbs fewer low-energy photons and hence is preferable for determining light elements such as Si, K and Ca.
DS2003-0533
2003
Hall, F.Hall, F.Community/Aboriginal agreements. IN: Mining agreements: deal makers and dealMinerals Economics Society 13th. Symposium, Toronto, January 20, 2p.GlobalMining agreements - legal
DS2001-1050
2001
Hall, G.Seneshen, D., Grunsky, E., Rencz, A., Hall, G., Dunn, C.Geochemical exploration for kimberlites in northern Alberta37th. Forum Industrial Minerals;, May 23-5, pp. 33-4.AlbertaGeochemistry
DS1990-0638
1990
Hall, G.E.M.Hall, G.E.M., Plant, J.A.Are your rare earth elements (REE) results total?Explore, No. 68, June pp. 18-20GlobalGeochemistry, Analyses -rare earth elements (REE).
DS1992-0655
1992
Hall, G.E.M.Hall, G.E.M., Plant, J.A.Analytical errors in the determination of high field strength elements and their implications in tectonic interpretation studiesChemical Geology, Vol. 95, No. 1-2, January 1, pp. 141-156GlobalGeochemistry -analysis, Tectonics
DS1993-0079
1993
Hall, G.E.M.Barefoot, R.R., Van Loon, J.C., Hall, G.E.M.Analytical methods: field and remote locationsAnalysis of geological materials, editor C. Riddle, pp. 221-261GlobalGeochemistry, Analysis -techniques -general
DS1993-1393
1993
Hall, G.E.M.Schmitt, H.R., Cameron, E.M., Hall, G.E.M., Viave, J.Mobilization of gold into lake sediments from acid and alkaline mineralized environments in the southern Canadian shield: gold in lake sediments andnat.watersJournal of Geochemical Exploration, Vol. 48, No. 3, August pp. 329-358Ontario, Saskatchewan, ManitobaGold geochemistry, Alkaline rocks
DS1994-0527
1994
Hall, G.E.M.Flight, D.M.A., Hall, G.E.M., Simpson, P.R.Regional geochemical mapping of Platinum, Palladium, and gold over an obducted ophiolite complex, Shetland IslandsInstitute of Mining and Metallurgy (IMM) Bulletin, Vol. 103, pp. B68-78ScotlandGeochemistry, Platinum, palladium, gold
DS1995-0727
1995
Hall, G.E.M.Hall, G.E.M.Sample preparation and decompositionBiological systems in mineral exploration and processing, pp. 427-442GlobalGeochemistry, Sample preparation techniques
DS1995-0728
1995
Hall, G.E.M.Hall, G.E.M.Analytical techniques and methodsBiological systems in mineral exploration and processing, pp. 443-490GlobalGeochemistry, Techniques - Spectrometry
DS2002-0641
2002
Hall, G.E.M.Hamilton, S.M., Cameron, S.C.M., McClenaghan, M.B., Hall, G.E.M.Thick overburden geochemical methods: studies over volcanogenic massive sulphideOntario Geological Survey Open File, Summary of Field Work, No. 6100, pp. 27-1-17.Ontario, TimminsGeochemistry
DS200612-0888
2006
Hall, G.E.M.McClenaghan, M.B., Hamilton, S.M., Hall, G.E.M., Burt, A.K., Kjarsgaard, B.A.Selective leach geochemistry of soils overlying the 95-2, B30 and A4 kimberlites, northeast Ontario.Geological Survey of Canada Open File, OF 5069, 28p. $ 9.00Canada, OntarioGeochemistry
DS201412-0334
2014
Hall, G.E.M.Hall, G.E.M., Bonham-Carter, G.F., Buchar, A.Evaluation of portable X-ray fluorescence (pXRF) in exploration and mining: Phase 1, control reference materials.Geochemistry: Exploration, Environment, Analysis, Vol. 14, 2, pp. 99-123.TechnologypXRF
DS201412-0567
2013
Hall, G.E.M.McClenaghan, M.B., Plouffe, A., McMartin, I., Campbell, J.E., Spirito, W.A., Paulen, R.C., Garrett, R.G., Hall, G.E.M.Till sampling and geochemical analytical protocols used by the Geological Survey of Canada.Geochemistry: Exploration, Environment, Analysis, Vol. 13, pp. 285-301.TechnologySampling
DS201312-0354
2013
Hall, G.EM.Hall, G.EM., McClenaghan, M.B.Field portable XRF in exploration and mining.GSC Open file 7374 Ftp2.cits.rncan.gc.ca, pp. 75-85.TechnologyXRF
DS1988-0283
1988
Hall, G.G.Hall, G.G., Mizukami, Y.A new method of calculating the spin density of trapped muonium indiamondChem. Phys. Letters, Vol. 150, No. 1-2, pp. 23-28GlobalDiamond morphology, MuoniuM.
DS1930-0193
1935
Hall, G.M.Hall, G.M., Amick, H.C.Mica Peridotite in TennesseeAmerican Mineralogist., Vol. 20, No. 3, PP. 204-205.United States, Appalachia, TennesseeRelated Rocks, Geology
DS1940-0085
1944
Hall, G.M.Hall, G.M., Amick, H.C.Igneous Rock Regions in the Norris RegionJournal of GEOLOGY, Vol. 52, PP. 424-430.United States, Appalachia, TennesseeRelated Rocks, Geology
DS1860-0844
1894
Hall, J.Hall, J., Darton, N.P.Geology of the Mohawk Valley in Herkimer, Fulton, Montgomery and Saratoga Counties.Thirteenth Annual Report Geological Survey New York, Vol. 1, PP. 409-429.United States, New YorkGeology
DS1986-0333
1986
Hall, J.Hall, J.Geophysical lineaments and deep continental structureIn: Major crustal lineaments and their influence on the geol. hist. of, Vol. 1317, 200p. pp. 33-44GlobalTectonics, Structure
DS1988-0765
1988
Hall, J.Wright, J.A., Hall, J.Anomalous crustal structure from deep seismic profiling in theKarooBasin, BotswanaEuropean Association of Exploration Geophysicists, abstract volume, 50th, p. 140. abstract onlyBotswanaBlank
DS1990-1585
1990
Hall, J.Wright, J.A., Hall, J.Deep seismic profiling in the Nosop Basin, Botswana:cratons, mobile belts and sedimentary basinsTectonophysics, Vol. 174, No. 1/2, March 1, pp. 333-344BotswanaGeophysics -seismics, Nosop Basin
DS1994-0701
1994
Hall, J.Hall, J., Quinlan, G.A collisional crustal fabric pattern recognized from seismic reflection profiles of Appalachian/CaledonianTectonophysics, Vol. 232, 1-4, pp. 31-42Appalachia, United StatesGeophysics -seismics, Tectonics, Orogeny
DS1995-0729
1995
Hall, J.Hall, J., et al.Proterozoic orogens of the northeastern canadian shield: new formation From the Lithoprobe ESCOOT.Canadian Journal of Earth Sciences, Vol. 32, pp. 1119-31.Quebec, Labrador, UngavaGeophysics - seismics, crustal reflection, Makkovik province
DS1995-0730
1995
Hall, J.Hall, J., Wardle, R.J., Gower, C.F., Kerr, A., Coffin, KeenProterozoic orogens of the northeastern Canadian Shield: new information from Lithoprobe ESCOOT seismicsCanadian Journal of Earth Sciences, Vol. 32, No. 8, Aug. pp. 1119-1131.GlobalGeophysics -seismics ESCOOT., Nain, Makkovik provinces
DS1997-0433
1997
Hall, J.Gower, C.F., Hall, J., Kifoil, G.J., Quinlan, WardleRoots of the Labradorian orogen in the Grenville Province in southeastLabrador: evidence from seismic.Tectonics, Vol. 16, No. 5, Oct. pp. 795-809Labrador, Quebec, UngavaGeophysics - seismics offshore, Model - Gravity, geodynamics, tectonics
DS1997-0586
1997
Hall, J.Kerr, A., Hall, J., Wardle, R.J., Gower, C.F., Ryan, B.New reflections on the structure and evolution of the Makkovikian Ketilidian Orogen in Labrador and GreenlandTectonics, Vol. 16, No. 6, Dec. pp. 942-965.Labrador, GreenlandTectonics, Geophysics - seismology
DS2001-0349
2001
Hall, J.Funck, T., Lowden, K.E., Hall, J.Wide angled reflectivity across Torngat Orogen northeast CanadaGeophysical Research Letters, Vol. 28, No. 18, Sept. 15, pp. 3541-44.Quebec, Ungava, LabradorGeophysics - seismics, Orogeny
DS2002-0635
2002
Hall, J.Hall, J., Louden, K.E., Funck, T., Deemer, S.Geophysical characteristics of the continental crust along the Lithoprobe Eastern Canadian Shield Onshore-Offshore Transect (ECSOOT): a review.Canadian Journal of Earth Science, Vol.39,5, May, pp.569-87.Quebec, Labrador, Baffin IslandGeophysics - ESCOOT, Tectonics
DS2002-1687
2002
Hall, J.Wardle, R.J., Hall, J.Proterozoic evolution of the northeastern Canadian Shield: lithoprobe eastern CanadianCanadian Journal of Earth Science, Vol.39,5, May, pp.563-7.Quebec, Labrador, Baffin IslandGeophysics - ESCOOT, Tectonics
DS2002-1688
2002
Hall, J.Wardle, R.J., James, D.T., Scott, D.J., Hall, J.The southeastern Churchill Province: synthesis of a Paleoproterozoic transpressional orogen.Canadian Journal of Earth Science, Vol.39,5, May, pp.639-63.Quebec, Labrador, Baffin IslandGeophysics - Torngat, New Quebec orogens, Trans Hudson, Tectonics - Nain, Superior Craton
DS201012-0118
2010
Hall, J.Cook, F.A., White, D.J., Jones, A.G., Eaton, D.W.S., Hall, J., Clowes, R.M.How the crust meets the mantle: lithoprobe perspectives on the Mohorovicic.Canadian Journal of Earth Sciences, Vol. 47, 4, pp. 315-351.Mantle, CanadaGeophysics - seismic
DS1982-0457
1982
Hall, J.K.Neev, D., Hall, J.K.A Global System of Spiraling GeosuturesJournal of Geophysical Research, Vol. 87, No. B 13, PP. L0689-L0, 708.GlobalTectonics
DS1985-0259
1985
Hall, J.M.Hall, J.M.The Iceland Research Drilling Project: variation of magnetic properties with depth in Icelandic type oceanic crust.Canadian Journal of Earth Sciences, Vol. 22, pp. 85-101.GlobalGeophysics - Magnetics
DS1986-0334
1986
Hall, J.M.Hall, J.M., Walls, C.C.The relationship bewteen dike density in horizontal and vertical profiles through dike swarmsGeological Association of Canada (GAC) Annual Meeting, Vol. 11, p. 76. (abstract.)GlobalDyke
DS1988-0284
1988
Hall, J.M.Hall, J.M., Fisher, B.E.The Iceland research drilling project crustal section: stable remagnetization below 3 Km crustal depth.Canadian Journal of Earth Sciences, Vol. 25, pp. 1304-15.GlobalCrust, magnetite
DS1989-0573
1989
Hall, J.M.Hall, J.M.The study of major faults in Canada by drilling: a CCDP workshop reportGeoscience Canada, Vol. 16, No. 1, March pp. 31-34OntarioTectonics, Faults
DS200412-2109
2003
Hall, K.White, D.J., Musacchio, G., Helmstaedt, H.H., Harrap, R.M., Thurston, P.C., Van der Velden, A., Hall, K.Images of lower crustal oceanic slab: direct evidence for tectonic accretion in the Archean western Superior Province.Geology, Vol. 31, 11, pp. 997-1000.Canada, OntarioSubduction - not specific to diamonds
DS2003-0270
2003
Hall, K. W.Cook, F.A., Lynn, C.E., Hall, K. W.Cross strike potential field anomalies in the Canadian CordilleraCanadian Journal of Earth Sciences, Vol. 40, 1, pp. 1-11.British ColumbiaGeophysics, Dikes, dykes
DS1997-0213
1997
Hall, K.W.Cook, F.A., Van der Velden, A.J., Hall, K.W., Roberts, B.R.Upper mantle reflectors beneath the SNORCLE transect - images of the base of the lithosphere.Lithoprobe Slave/SNORCLE., pp. 58-62.MantleGeophysics - seismics
DS1998-0270
1998
Hall, K.W.Cook, F.A., Van der Velden, A.J., Hall, K.W., Roberts, B.R.Tectonic delamination and subcrustal imbrication of the Precambrian lithosphere in northwestern Canada...Geology, Vol. 26, No. 9, Sept. pp. 839-42.Northwest TerritoriesLithoprobe - Slave Province, Geophysics - seismics
DS1998-0562
1998
Hall, K.W.Hall, K.W., Cook, F.A.Geophysical transect of the Eagle Plains foldbelt and Richardson Mountainsanticlinorium, northwestern CanadaGeological Society of America (GSA) Bulletin., Vol. 110, No.3 March, pp. 311-325.Northwest Territories, YukonGeophysics, Structure, tectonics
DS1999-0146
1999
Hall, K.W.Cook, F.A., Van der Velden, A.J., Hall, K.W.Frozen subduction in Canada's Northwest Territories: Lithoprobe deep lithospheric reflection profiling....Tectonics, Vol. 18, No. 1, Feb. pp. 1-24.Northwest TerritoriesGeophysics - seismics, Lithoprobe western Canadian Shield
DS200412-0357
2004
Hall, K.W.Cook, F.A., Clowes, R.M., Snyder, D.B., Van der Velden, A.J., Hall, K.W., Erdmer, P., Evenchick, C.A.Precambrian crust beneath the Mesozoic northern Canadian Cordillera discovered by lithoprobe seismic reflection profiling.Tectonics, Vol. 23, 2, TC2012 10.1029/2003TC001412Canada, Northwest Territories, British Columbia, YukonGeophysics - seismics
DS200512-0187
2005
Hall, K.W.Cook, F.A., Hall, K.W., Lynn, C.E.The edge of northwestern North America at ~1.8 Ga.Canadian Journal of Earth Sciences, Vol. 42, 6, June pp. 983-997.Canada, Northwest Territories, NunavutGeophysics - seismics, lithoprobe
DS200612-0756
2006
Hall, K.W.Kynn, C.E., Cook, F.A., Hall, K.W.Tectonic significance of potential field anomalies in western Canada: results from the Lithoprobe SNORCLE transect.Canadian Journal of Earth Sciences, Vol. 42, 6, pp. 1239-1255.Canada, Northwest TerritoriesGeophysics - seismics
DS1997-0961
1997
Hall, M.Robin, C., Hall, M., Jiminez, M et al.MojAnd a volcanic comple: development of two adjacent contemporaneous volcanoes with contrasting eruptive ..Journal of South American Earth Sci, Vol. 10, No. 5-6, pp. 345-59EcuadorMagma suites, Geodynamics, geochemistry, volcanics
DS2002-0851
2002
Hall, M.King, J.M., Shigley, J.E., Guhin, S.S., Gelb, T.H., Hall, M.Characterization and grading of natural colour pink diamondsGems & Gemology, Vol. 38, Summer, pp. 128-147.Australia, India, Brazil, South AfricaDiamonds - pink ( database of 1500 ), Notable - list ( more than 9 cts each)
DS2002-0852
2002
Hall, M.King, J.M., Shigley, J.E., Guhin, S.S., Gelb, T.H., Hall, M.Box A: understanding the relationship of pink and "red" diamonds in GIA colour grading system.Gems & Gemology, Vol. 38, Summer, pp. 134-140.GlobalDiamonds - pink, red
DS2003-1450
2003
Hall, M.Wang, W., Moses, T., Linares, R.C., Shigley, J.E., Hall, M., Butler, J.E.Gem quality synthetic diamonds grown by a chemical vapor deposition ( CVD)Gems & Gemology, Vol. 39, Winter,pp. 268-283.GlobalBlank
DS200412-2083
2003
Hall, M.Wang, W., Moses, T., Linares, R.C., Shigley, J.E., Hall, M., Butler, J.E.Gem quality synthetic diamonds grown by a chemical vapor deposition ( CVD) method.Gems & Gemology, Vol. 39, Winter,pp. 268-283.TechnologySynthetic diamond
DS200512-0532
2005
Hall, M.King, J.M., Shigley, J.E., Gelb, T.H., Guhin, S.S., Hall, M., Wang, W.Characterization and grading of natural colour yellow diamonds.Gems & Gemology, Vol. 41, 2, Summer pp. 88-115.GlobalHistory, genesis, origin, cut
DS200812-1238
2007
Hall, M.Wang, W., Hall, M., Breeding, C.M.Natural TYPE 1A diamond with green yellow colour due to Ni related defects.Gems & Gemology, Fall, pp. 240-243.TechnologyDiamond - IA
DS200512-1167
2005
Hall, M.S.Wang, W., Smith, C.P., Hall, M.S., Breeding, C.M., Moses, T.M.Treated color pink to red diamonds from Lucent Diamonds Inc.Gems & Gemology, Vol. 41, 1, Spring pp. 6-19.Diamond - treatment, Lucent
DS200612-1508
2005
Hall, M.S.Wang, W., Tallaire, A., Hall, M.S., Moses, T.M., Achard, J., Sussmans, R.S., Gicquel, A.Experimental CVD synthetic diamonds form LIMPH-CNRD France.Gems & Gemology, Vol. 41, 3, Fall, pp. 234244.TechnologySynthetic diamonds
DS200712-0977
2007
Hall, M.S.Shen, A.H., Wang, W., Hall, M.S., Novak, S., McClure, S.F., Shigley, J.E., Moses, T.M.Serenity coated colored diamonds: detection and durability.Gems & Gemology, Vol. 43, 1, Spring pp. 16-34.TechnologyFancy diamonds
DS1960-1121
1969
Hall, P.K.Hall, P.K.The Diamond Fields of Sierra LeoneSierra Leone Geological Survey Bulletin., Vol. 1, No. 5, 133P.Sierra Leone, West Africa, Yengema, Koidu, Lower Moinde, YomadGeology, Kimberley, History, Exploration, Prospecting, Geomorpholog
DS2001-0435
2001
Hall, P.S.Hall, P.S., Kincaid, C.Diapiric flow at subduction zones: a recipe for rapid transportScience, No. 5526, June 29, pp. 2472-4.MantleSubduction - fluid flow
DS2003-0716
2003
Hall, P.S.Kincaid, C., Hall, P.S.Role of back arc spreading in circulation and melting at subduction zonesJournal of Geophysical Research, Vol.108, B5, 10.1029/2001JB001174MantleSubduction
DS200412-1004
2003
Hall, P.S.Kincaid, C., Hall, P.S.Role of back arc spreading in circulation and melting at subduction zones.Journal of Geophysical Research, Vol.108, B5, 10.1029/2001 JB001174MantleSubduction
DS201212-0281
2012
Hall, P.S.Hall, P.S.On the thermal evolution of the mantle wedge at subduction zones.Physics of the Earth and Planetary Interiors, Vol. 198-199, pp. 9-27.MantleSubduction
DS1985-0260
1985
Hall, R.Hall, R.Row Shakes Diamond State RulersObserver., JANUARY 27TH.West Africa, Sierra LeoneHistory, Politics, Jamil, Economics
DS1996-0585
1996
Hall, R.Hall, R., Blundell, D.Tectonic evolution of southeast AsiaGeological Society of London, Special Publication No. 106, 600p. approx. 175.00 UnitedPhilippines, Indonesia, Laos, Thailand, Papua New Guinea, ChinaBook -table of contents, Tectonics, ophiolites, Banda arc, orogeny, Bacan
DS1996-0586
1996
Hall, R.Hall, R., Blundell, D.J.Tectonic evolution of southeast Asia: introductionGeological Society of London Special Paper, No. 106, pp. Vii-XiiiGlobalTectonics
DS2002-0636
2002
Hall, R.Hall, R.Cenozoic geological and plate tectonic evolution of SE Asia and SW Pacific: computer based reconstructions....Journal of Asian Earth Sciences, Vol.20,4,pp.353-431.Asia, India, New GuineaTectonics, boundary
DS2002-0637
2002
Hall, R.Hall, R.Cenozoic geological and plate tectonic evolution of SE Asia and the SW Pacific: computer based reconstructions, model and animations.Journal of Asian Earth Sciences, Vol.20,4,April pp. 353-431.Asia, PacificTectonics - not specific to diamonds
DS2002-0638
2002
Hall, R.Hall, R.Cenozoic geological and plate tectonic evolution of SE Asia and the SW Pacific: computer based reconstructionsJournal of Asian Earth Sciences, Vol.20, 4, pp. 353-431.southeast Asia, southwest PacificMagmatism - boninite, Tectonics
DS2002-0980
2002
Hall, R.Macpherson, C.G., Hall, R.Timing and tectonic controls in the evolving orogen of SE Asia and the western Pacific and some implications for ore generation.Geological Society of London Special Publication, No. 204, pp.49-68.AsiaTectonics - not specific to diamonds
DS200412-0763
2004
Hall, R.Hall, R.Canadian emeralds... a rare blue aquamarine.Canadian Mining Journal, April, pp. 22-26.Canada, YukonNews item - history
DS200412-0765
2004
Hall, R.Hall,R., Spakman, W.Mantle structure and tectonic evolution of the region north and east of Australia.Hillis, R.R., Muller, R.D. Evolution and dynamics of the Australian Plate, Geological Society America Memoir, No. 372, pp. 361-382.AustraliaTectonics
DS200412-0828
2004
Hall, R.Hill, K.C., Hall, R.Mesozoic - Cenozoic evolution of Australia's New Guinea margin in a west Pacific context.Hillis, R.R., Muller, R.D. Evolution and dynamics of the Australian Plate, Geological Society America Memoir, No. 372, pp. 265-290.AustraliaTectonics
DS201312-0355
2013
Hall, R.Hall, R.Diamond mining in Canada's Northwest Territories: a colonial continuity.Antipode ( Blackwell Publishing), Vol. 45, 2, pp. 376-393.Canada, Northwest TerritoriesHistory
DS201502-0123
2014
Hall, R.White, L., Graham, I., Armstrong, R., Hall, R.Tracing the source of Borneo's Cempaka deposit.American Geophysical Union, December - Fall meeting in San Francisco, abstractAsia, KalimantanDeposit - Cempaka
DS201603-0431
2016
Hall, R.White, L.T., Graham, I., Tanner, D., Hall, R., Armstrong, R.A., Yaxley, G., Barron, L.The provenance of Borneo's enigmatic alluvial diamonds: a case study from Cempaka, SE Kalimantan.Gondwana Research, in press available 22p.Asia, KalimantanAlluvials, diamonds

Abstract: Gem-quality diamonds have been found in several alluvial deposits across central and southern Borneo. Borneo has been a known source of diamonds for centuries, but the location of their primary igneous source remains enigmatic. Many geological models have been proposed to explain their distribution, including: the diamonds were derived from a local diatreme; they were brought to the surface through ophiolite obduction or exhumation of UHP metamorphic rocks; they were transported long distances southward via major Asian river systems; or, they were transported from the Australian continent before Borneo was rifted from its northwestern margin in the Late Jurassic. To assess these models, we conducted a study of the provenance of heavy minerals from Kalimantan's Cempaka alluvial diamond deposit. This involved collecting U Pb isotopic data, fission track and trace element geochemistry of zircon as well as major element geochemical data of spinels and morphological descriptions of zircon and diamond. The results indicate that the Cempaka diamonds were likely derived from at least two sources, one which was relatively local and/or involved little reworking, and the other more distal which records several periods of reworking. The distal diamond source is interpreted to be diamond-bearing pipes that intruded the basement of a block that: (1) rifted from northwest Australia (East Java or SW Borneo) and the diamonds were recycled into its sedimentary cover, or: (2) were emplaced elsewhere (e.g. NW Australia) and transported to a block (e.g. East Java or SW Borneo). Both of these scenarios require the diamonds to be transported with the block when it rifted from NW Australia in the Late Jurassic. The local source could be diamondiferous diatremes associated with eroded Miocene high-K alkaline intrusions north of the Barito Basin, which would indicate that the lithosphere beneath SW Borneo is thick (~ 150 km or greater). The ‘local’ diamonds could also be associated with ophiolitic rocks that are exposed in the nearby Meratus Mountains.
DS201911-2531
2019
Hall, R.Hall, R.The subduction initiation stage of the Wilson cycle.N: Cycle Concepts in Plate Tectonics, editors Wilson and Houseman , Geological Society of London special publication 470, pp. 415-437.Mantleplate tectonics

Abstract: In the Wilson cycle, there is a change from an opening to a closing ocean when subduction begins. Subduction initiation is commonly identified as a major problem in plate tectonics and is said to be nowhere observable, yet there are many young subduction zones at the west Pacific margins and in eastern Indonesia. Few studies have considered these examples. Banda subduction developed by the eastwards propagation of the Java trench into an oceanic embayment by tearing along a former ocean-continent boundary. The earlier subducted slab provided the driving force to drag down unsubducted oceanic lithosphere. Although this process may be common, it does not account for young subduction zones near Sulawesi at different stages of development. Subduction began there at the edges of ocean basins, not at former spreading centres or transforms. It initiated at a point where there were major differences in elevation between the ocean floor and the adjacent hot, weak and thickened arc/continental crust. The age of the ocean crust appears to be unimportant. A close relationship with extension is marked by the dramatic elevation of land, the exhumation of deep crust and the spectacular subsidence of basins, raising questions about the time required to move from no subduction to active subduction, and how initiation can be identified in the geological record.
DS201803-0474
2017
Hall, R.A.Sepehri, M., Apel, D.B., Hall, R.A.Prediction of mining induced surface subsidence and ground movements at a Canadian diamond mine using electroplastic finite element model. International Journal of Rock Mechanics and Mining Sciences, Vol. 100, pp. 73-82.Canada, Northwest Territoriesdeposit - Diavik
DS1987-0271
1987
Hall, R.D.Hall, R.D., Hughes, D.J.Noritic dykes of southern West Greenland: early ProterozoicboniniticmagmatismContributions to Mineralogy and Petrology, Vol. 97, No. 2, pp. 169-182GreenlandBoninite
DS1993-0616
1993
Hall, R.D.Hall, R.D., Horn, L.L.Rates of hornblende etching in soils in glacial deposits of the northern Rocky Mountains (Wyoming-Montana); United States (US): influence of climate/parentChemical Geology, Vol. 105, pp. 17-29Wyoming, MontanaGeomorphology, Wind River Range, Tobacco Root Range
DS1989-1417
1989
Hall, R.P.Snyder, G.L., Hall, R.P., Hughes, D.J., Ludwig, K.R.Mafic intrusives in Precambrian rocks of the Wyoming Province and BeltBasinNew Mexico Bureau of Mines Bulletin., Continental Magmatism Abstract Volume, Held, Bulletin. No. 131, p. 249. AbstractWyomingUltramafic
DS1991-0650
1991
Hall, R.P.Hall, R.P., Hughes, D.J.Early Precambrian basic magmatismChapman and Hall, 472pSouth Africa, Ontario, Wyoming, Minnesota, Wisconsin, Greenland, ScotlandBook -table of contents, Magmatism, Archean, Precambrian, geochemistry
DS1993-0617
1993
Hall, R.P.Hall, R.P., Hughes, .J.Early Precambrian crustal development: changing styles of mafic SOURCE[ Journal of the Geological Society of LondonJournal of the Geological Society of London, Vol. 150, pp. 625-635GlobalArchean-Proterozoic suites, Crust
DS2000-1005
2000
Hall, R.P.Ward, S.E., Hall, R.P., Hughes, D.J.Guruve and Mutare dikes: preliminary geochemical indication of complex Mesoproterozoic mafic magmatic..Journal of African Earth Sciences, Vol. 30, No.3, pp. 689-701.ZimbabweGeochemistry - dikes, Magmatism
DS200412-0788
2004
Hall, R.P.Hanson, R.E., Gose, W.A., Crowley, J.L., Ramezani, J., Bowring, S.A., Bullen, D.S., Hall, R.P., Pancake, J.A.Paleoproterozoic intraplate magmatism and basin development on the Kaapvaal Craton: age, paleomagnetism and geochemistry of 1.93South African Journal of Geology, Vol. 107, 1/2, pp. 233-254.Africa, South AfricaCraton, tectonics, magmatism
DS1993-0618
1993
Hall, S.Hall, S.Mineral production in the former Soviet UnionRaw Materials Data, Vol. 9, No. 1, pp. 16-19Russia, Commonwealth of Independent States (CIS)Economics, Mineral production
DS2003-0534
2003
Hall, T.Hall, T., Wyeth, J.Diamond mining in northern OntarioCanada Forum: Held Nov. 204, Joint Ventures-Joint Rewards. The resource, [email protected] 180p. binder $ 120.00Ontario, AttawapiskatConference - talk
DS200412-0764
2003
Hall, T.Hall, T., Wyeth, J.Diamond mining in northern Ontario.Canada Forum: Held Nov. 204, Joint Ventures-Joint Rewards. The resource industry and aboriginal development co, [email protected] 180p. binder $ 120.00Canada, Ontario, Attawapiskat, James Bay LowlandsConference - talk
DS200812-1239
2007
Hall, W.S.Wang, W., Hall, W.S., Soe Moe, K., Tower, J., Moses, T.M.Latest generation CVD grown synthetic diamonds from Appollo Diamond Inc.Gems & Gemology, Vol. 43, 4, Winter pp. 294-312.TechnologyOverview of CVD
DS2001-0936
2001
Hall et alPokhilenko, N.P., Sobolev, N.V., McDonald, Hall et alCrystalline inclusions in diamonds from kimberlites of the Snap lake: new evidence anomalous lithosphericDoklady Academy of Sciences, Vol. 380, No. 7, Sept-Oct. pp.806-12.Northwest TerritoriesDiamond - inclusions, Deposit - Snap lake
DS1995-0731
1995
Hall. J.Hall. J., Wardle, R.J., et al.Proterozoic orogens of the northwest Canadian shield: new information from Lithoprobe ESCOOT crustal seismics.Canadian Journal of Earth Sciences, Vol. 32, No. 8, Aug. pp. 1119-1131Manitoba, Saskatchewan, SuperiorTectonics, Geophysics -seismics, ESCOOT.
DS1975-0892
1978
Halladay, L.B.Watson, K.D., Bruce, G.S.W., Halladay, L.B.Kimberlitic Dyke in Keith Township, OntarioCanadian Mineralogist., Vol. 16, PP. 97-102.Canada, OntarioPetrography, Genesis, Texture, Microprobe, Analyses, Ilmenite
DS1950-0355
1957
Hallagan, R.W.Shoemaker, E.M., Hensley, F.S.JR, Hallagan, R.W.Diatremes on the Navajo and Hopi Reservation, Arizona. #2United States Geological Survey (USGS) SPECIAL Publishing, No. TEI-690, PP. 389-398.United States, Arizona, Colorado Plateau, Rocky MountainsDiatreme
DS1988-0022
1988
Hallam, A.Audley-Charles, M.G., Hallam, A.Gondawana and TethysOxford University of Press, 328p. $ 98.00GlobalPaleogeography
DS1960-0457
1964
Hallam, C.D.Hallam, C.D.The Geology of the Coastal Diamond Deposits of Southern Africa. In: the Geology of Some Ore Deposits in South Africa.Johannesburg: Geological Society of South Africa, Vol. 2, PP. 671-728.Angola, Southwest Africa, Namibia, Central AfricaKimberley, Geology, Littoral Diamond Placers
DS1989-0085
1989
Hallbauer, D.K.Barton, E.S., Bristow, J., Hallbauer, D.K.Provenance ages for the Witwatersrand supergroup: constrainst from uranium-lead (U-Pb) (U-Pb)ages of detrital zircons in the Orange Grove quartzite and the VentersdorpcontacTectonics Division and Western Transvaal Branch of the Geological Society South, 1p. (abstract.)South AfricaGeochronology, Witwatersrand research
DS201312-0356
2013
Halldorsson, S.A.Hallis, L.J., Huss, G.R., Taylor, D.R., Nagashima, K., Halldorsson, S.A., Hilton, D.R.The D/H ratio of the deep mantle.Goldschmidt 2013, AbstractMantleDeuterium/Hydrogen
DS201512-1924
2015
Halldorsson, S.A.Hallis, L.J., Huss, G.R., Nagashima, K., Taylor, G.J., Halldorsson, S.A.Evidence of primordial water in Earth's deep mantle.Science, Vol. 350, 6252 Nov. 13, pp. 795-797.MantleWater

Abstract: The hydrogen-isotope [deuterium/hydrogen (D/H)] ratio of Earth can be used to constrain the origin of its water. However, the most accessible reservoir, Earth’s oceans, may no longer represent the original (primordial) D/H ratio, owing to changes caused by water cycling between the surface and the interior. Thus, a reservoir completely isolated from surface processes is required to define Earth’s original D/H signature. Here we present data for Baffin Island and Icelandic lavas, which suggest that the deep mantle has a low D/H ratio (?D more negative than -218 per mil). Such strongly negative values indicate the existence of a component within Earth’s interior that inherited its D/H ratio directly from the protosolar nebula.
DS202005-0744
2020
Halldorsson, S.A.Labidi, J., Barry, P.H., Bekaert, D.V., Broadley, M.W., Marty, B., Giunta, T., Warr, O., Sherwood Lollar, B., Fischer, T.P., Avice, G., Caracusi, A., Ballentine, C.J., Halldorsson, S.A., Stefansson, A., Kurz, M.D., Kohl, I.E., Young, E.D.Hydrothermal 15N15N abundances constrain the origins of mantle nitrogen.Nature, Vol. 580, 7803 pp. 367-371. Mantlenitrogen

Abstract: Nitrogen is the main constituent of the Earth’s atmosphere, but its provenance in the Earth’s mantle remains uncertain. The relative contribution of primordial nitrogen inherited during the Earth’s accretion versus that subducted from the Earth’s surface is unclear1,2,3,4,5,6. Here we show that the mantle may have retained remnants of such primordial nitrogen. We use the rare 15N15N isotopologue of N2 as a new tracer of air contamination in volcanic gas effusions. By constraining air contamination in gases from Iceland, Eifel (Germany) and Yellowstone (USA), we derive estimates of mantle ?15N (the fractional difference in 15N/14N from air), N2/36Ar and N2/3He. Our results show that negative ?15N values observed in gases, previously regarded as indicating a mantle origin for nitrogen7,8,9,10, in fact represent dominantly air-derived N2 that experienced 15N/14N fractionation in hydrothermal systems. Using two-component mixing models to correct for this effect, the 15N15N data allow extrapolations that characterize mantle endmember ?15N, N2/36Ar and N2/3He values. We show that the Eifel region has slightly increased ?15N and N2/36Ar values relative to estimates for the convective mantle provided by mid-ocean-ridge basalts11, consistent with subducted nitrogen being added to the mantle source. In contrast, we find that whereas the Yellowstone plume has ?15N values substantially greater than that of the convective mantle, resembling surface components12,13,14,15, its N2/36Ar and N2/3He ratios are indistinguishable from those of the convective mantle. This observation raises the possibility that the plume hosts a primordial component. We provide a test of the subduction hypothesis with a two-box model, describing the evolution of mantle and surface nitrogen through geological time. We show that the effect of subduction on the deep nitrogen cycle may be less important than has been suggested by previous investigations. We propose instead that high mid-ocean-ridge basalt and plume ?15N values may both be dominantly primordial features.
DS202107-1091
2021
Halldorsson, S.A.Bekaert, D.V., Turner, S.J., Broadley, M.W., Barnes, J.D., Halldorsson, S.A., Labidi, J., Wade, J., Walowski, K.J., Barry, P.H.Subduction-driven volatile recycling: a global mass balance.Annual Review of Earth and Planetary Sciences, Vol. 49, pp. 37-70.Mantlesubduction

Abstract: Volatile elements (water, carbon, nitrogen, sulfur, halogens, and noble gases) played an essential role in the secular evolution of the solid Earth and emergence of life. Here we provide an overview of Earth's volatile inventories and describe the mechanisms by which volatiles are conveyed between Earth's surface and mantle reservoirs, via subduction and volcanism. Using literature data, we compute volatile concentration and flux estimates for Earth's major volatile reservoirs and provide an internally balanced assessment of modern global volatile recycling. Using a nitrogen isotope box model, we show that recycling of N (and possibly C and S) likely began before 2 Ga and that ingassing fluxes have remained roughly constant since this time. In contrast, our model indicates recycling of H2O(and most likely noble gases) was less efficient in the past. This suggests a decoupling of major volatile species during subduction through time, which we attribute to the evolving thermal regime of subduction zones and the different stabilities of the carrier phases hosting each volatile. This review provides an overview of Earth's volatile inventory and the mechanisms by which volatiles are transferred between Earth reservoirs via subduction. The review frames the current thinking regarding how Earth acquired its original volatile inventory and subsequently evolved through subduction processes and volcanism.
DS1993-0619
1993
Haller, K.M.Haller, K.M.Maps of major active faults, western Hemisphere, ILP project II-2, guidelinesUnited States Geological Survey (USGS) Open File, No. 93-0338, 45p. $ 7.25United States, CanadaStructure, Faults -maps
DS2002-0023
2002
Haller, K.M.Allaoua Saadi, M.N., Machette,K.M., Haller,K.M., Dart, R.L., Bradley, L-A.Map and database of Quaternary faults and lineaments in BrazilU.s. Geological Survey, OF 02-0230 58p $ 76. http://pubs.usgs.gov/of/2002/ofr-BrazilBlank
DS200412-0019
2002
Haller, K.M.Allaoua Saadi, M.N., Machette,K.M., Haller,K.M., Dart, R.L., Bradley, L-A., De Souza, A.M.P.D.Map and database of Quaternary faults and lineaments in Brazil.U.S. Geological Survey, OF 02-0230 58p $ 76.South America, BrazilMap - structure
DS1999-0212
1999
Haller, M.Feraud, G., Alric, V., Haller, M.40 Ar-39 Ar dating of the Jurassic volcanic province of Patagonia:migrating magmatism related to GondwanaEarth and Planetary Science Letters, Vol. 172, No. 1-2, Oct. 15, pp. 83-96.GlobalSubduction, Argon, Magmatism - geochronology
DS1990-0639
1990
Halleran, A.A.D.Halleran, A.A.D., Russell, J.K.Geology and descriptive petrology of the Mount Bisson alkaline complex, Munroe Creek, British ColumbiaBritish Columbia Mineral Resources Division, Paper 1990-1, pp. 297-304British ColumbiaAlkaline complex, Mount Bisson
DS201412-0874
2014
Hallett, B.W.Spear, F.S., Thomas, J.B., Hallett, B.W.Overstepping the garnet isograd: a comparison of QuiG barometry and thermodynamic modeling quartz in garnet isocrhon.Contributions to Mineralogy and Petrology, Vol. 168, pp. 1059 -United States, VermontGarnet ( not specfic to diamond)
DS1990-1096
1990
HallidayNeal, C.R., Taylor, L.A., Davidson, J.P., Holden, P., HallidayEclogites with oceanic crustal and mantle signatures from the BellsbankEarth and Planetary Science Letters, Vol. 99, pp. 362-379South AfricaEclogites, Bellsbank -geochronology
DS1996-0158
1996
HallidayBoundy, T.M., Essene, E.J., Hall, C., Austrheim, HallidayRapid exhumation of lower crust during continent-continent collision and Late extension...Geological Society of America (GSA) Bulletin., Vol. 108, No. 11, Nov. pp. 1425-37.NorwayCaledonian Orogeny, Geochronology
DS1998-1367
1998
HallidaySnyder, G.A., Taylor, L.A., Beard, B.L., HallidayThe diamond bearing Mir eclogites, neodymium and Strontium isotopic evidence for continental crustal input Archean Oceanic7th International Kimberlite Conference Abstract, pp. 826-8.Russia, YakutiaEclogites, Deposit - Mir
DS1999-0691
1999
HallidaySnyder, G.A., Taylor, Beard, Halliday, Sobolev, SimakovThe diamond bearing Mir eclogites: neodymium Strontium isotopic evidence for a possible early to Mid Proterozoic source7th International Kimberlite Conference Nixon, Vol. 2, pp. 808-15.Russia, Siberia, YakutiaDepleted mantle source with arc affinity, Mineral chemistry, geothermometry
DS200412-2118
2004
HallidayWilliams, H.M., McCammon, C.A., Peslier, Halliday, Teutsch, Levasseur, BurgIron isotope fractionation and the oxygen fugacity of the mantle.Geochimica et Cosmochimica Acta, 13th Goldschmidt Conference held Copenhagen Denmark, Vol. 68, 11 Supp. July, ABSTRACT p.A563.MantleMelting
DS1986-0562
1986
Halliday, A.Menzies, M., Halliday, A., Palacz, Z., Hunter, R., Hawkesworth, C.Barium and light rare earth element (LREE) enriched mantle below the Archean crust of ScotlandProceedings of the Fourth International Kimberlite Conference, Held, No. 16, pp. 294-295ScotlandBlank
DS1988-0459
1988
Halliday, A.Menzies, M., Halliday, A.Lithospheric mantle domains beneath the Archean and Proterozoic crust ofScotlandJournal of Petrology, Special Volume 1988- Oceanic and Continental, pp. 275-302ScotlandMantle
DS1995-0398
1995
Halliday, A.Dawson, J.B., James, D., Paslick, m C., Halliday, A.Thermal anomay in the upper mantle beneath a propagating continental rift:evdience Labait VolcanoProceedings of the Sixth International Kimberlite Conference Extended Abstracts, p. 124-5.TanzaniaTectonics, magmatism, Carbonatite
DS1995-1444
1995
Halliday, A.Paslick, C., Halliday, A., James, D., Dawson, J.B.Enrichment of the continental lithosphere by Ocean Island Basalt (OIB) melts: isotopic evidence from volcanic province, Tanzania.Earth and Planetary Science Letters, Vol. 130, No. 1-4, Feb. pp. 109-126.TanzaniaGeochronology, Volcanics
DS200412-1569
2004
Halliday, A.Porcelli, D., Pepin, R., Halliday, A., Ballentine, C.Xe, mantle degassing and atmospheric closure.Geochimica et Cosmochimica Acta, 13th Goldschmidt Conference held Copenhagen Denmark, Vol. 68, 11 Supp. July, ABSTRACT p.A553.MantleDegassing
DS1996-1075
1996
Halliday, A.H.Paslick, C.R., Halliday, A.H., Dawson, J.B.Indirect crustal contamination evidence from isotopic and chemical disequilibration temperatures in minerals from .....Contributions to Mineralogy and Petrology, Vol. 125, No. 4, pp. 277-292.TanzaniaAlkali basalts, Nephilinites
DS1996-0344
1996
Halliday, A.M.Dawson, J.B., Halliday, A.M., Paslick, C.Contrasting metasomatic styles in the Tanzanian lithospheric mantleInternational Geological Congress 30th Session Beijing, Abstracts, Vol. 1, p. 122.TanzaniaCarbonatite, Nephelinite
DS1987-0466
1987
Halliday, A.N.Menzies, M.A., Halliday, A.N., Palacz, Z., Hunters, R.H., UptonEvidence from mantle xenoliths for an enriched lithospheric keel under the outer HebridesNature, Vol. 325, January 1, pp. 44-47GlobalMantle xenoliths
DS1988-0285
1988
Halliday, A.N.Halliday, A.N., Dickin, A.P., Fallick, A.E., Fitton, J.G.Mantle dynamics: a neodynium, strontium, lead and oxygen isotopic study Of the Cameroon line volcanicchainJournal of Petrology, Vol. 29, No. 1, pp. 181-211GlobalMantle, Geochronology
DS1989-1008
1989
Halliday, A.N.Menzies, M.A., Halliday, A.N., Hunter, R.H., MacIntyre, R.M., UptonThe age, composition and significance of a xenolith bearing monchiquitedike, Lewis, ScotlandGeological Society of Australia Inc. Blackwell Scientific Publishing, Special, No. 14, Vol. 2, pp. 843-852ScotlandMantle xenoliths
DS1989-1101
1989
Halliday, A.N.Neal, C.R., Taylor, L.A., Davidson, J.P., Halliday, A.N., ClaytonIsotopic signatures of mantle ecologites: the identification of ancient subducted components and later metasomatic eventsEos, Vol. 70, No. 43, October 24, p. 1410. AbstractSouth AfricaBellsbank, Eclogites
DS1990-1451
1990
Halliday, A.N.Taylor, L.A., Neal, C.R., Davidson, J.P., Halliday, A.N., ClaytonEclogite xenoliths in kimberlite products of ancientsubductionprocessesEos, Vol. 71, No. 17, April 24, p. 523 Abstract onlySouth AfricaBellsbank, Roberts Victor, Eclogite xenoliths
DS1991-0651
1991
Halliday, A.N.Halliday, A.N., Ohr, M., Mezger, K., Chesley, J.T., Nakai, S.Recent developments in dating ancient crustal fluid flowReviews of Geophysics, Vol. 29, No. 4, November pp. 577-584MantleModel -fluid flow, Geochronology
DS1991-1145
1991
Halliday, A.N.Mezger, K., Van der Pluijm, B.A., Essene, E.J., Halliday, A.N.Synorogenic collapse: a perspective from the middle crust, the Proterozoic Grenville orogenScience, Vol. 254, November 1, pp. 695-698OntarioTectonics, Grenville orogeny
DS1992-0656
1992
Halliday, A.N.Halliday, A.N., Davies, G.R., Lee, D-C, Tommasini, S., Paslick, C.R.Lead isotope evidence for young trace element enrichment in the oceanic upper mantleNature, Vol. 359, No. 6396, October 15, pp. 623-626MantleGeochronology
DS1992-0657
1992
Halliday, A.N.Halliday, A.N., et al.Cerium, Uranium, Barium, Potassium and lead in earth's mantle: theEos, Transactions, Annual Fall Meeting Abstracts, Vol. 73, No. 43, October 27, abstracts p. 655MantlePerovskite, barium, cerium, uranium, potassium
DS1993-0620
1993
Halliday, A.N.Halliday, A.N., Dickin, A.P., Hunter, R.N., Davies, G.R., DempsterFormation and composition of the lower continental crust: evidence from Scottish xenolith suitesJournal of Geophysical Research, Vol. 98, No. B 1 January 10, pp. 581-608ScotlandXenoliths, Crust
DS1993-1195
1993
Halliday, A.N.Paslick, C.R., Halliday, A.N., Davies, G.R., Mezger, K., Upton, B.G.J.Timing of Proterozoic magmatism in the Gardar Province, southernGreenland.Geological Society of America Bulletin, Vol. 105, No. 2, February pp. 272-278.GreenlandAlkaline rocks, Ilmaussaq Complex
DS1993-1493
1993
Halliday, A.N.Snyder, G.A., Jerde, E.A., Taylor, L.A., Halliday, A.N., Sobolevneodymium and Strontium isotopes from Diamondiferous eclogites, UdachnayaEarth and Planetary Science Letters, Vol. 118, No. 1-4, July, pp. 91-100.Russia, Siberia, YakutiaGeochronology, Deposit -Udachnaya
DS1996-0828
1996
Halliday, A.N.Lee, D.C., Halliday, A.N., Davies, G.R., Essene, FittonMelt enrichment of shallow depleted mantle - detailed petrological trace element and isotopic study...Journal of Petrology, Vol. 37, No. 2, April pp. 415-441.GlobalMantle derived xenoliths, Megacrysts, petrology
DS1999-0591
1999
Halliday, A.N.Renkamper, M., Halliday, A.N., Takazawa, E.Non-chondritic platinum group element ratios in oceanic mantle lithosphere:petrogenetic signature melt...Earth and Planetary Science Letters, Vol. 172, No. 1-2, Oct. 15, pp. 65-82.MantlePlatinum group elements, Melt percolation
DS2000-0017
2000
Halliday, A.N.Amelin, Y., Lee, D.C., Halliday, A.N.Early middle Archean crustal evolution deduced from Lutetium - Hafnium and uranium-lead (U-Pb) isotopic studies.Geochimica et Cosmochimica Acta, Vol. 64, No. 24, Dec. 1, pp. 4205-26.MantleTectonics, Geochronology
DS2001-0436
2001
Halliday, A.N.Halliday, A.N.Earth Science: in the beginningNature, Vol. 409, No. 6817, Jan. 11, p. 144.MantleTectonics
DS2001-0942
2001
Halliday, A.N.Porcelli, D., Halliday, A.N.The core as a possible source of mantle heliumEarth and Planetary Science Letters, Vol. 192, No.1, pp. 45-56.MantleHelium - core, Geochemistry
DS200412-2117
2004
Halliday, A.N.Williams, H.M., McCammon, C.A., Peslier, A.H., Halliday, A.N., Teutsch, N., Levasseur, S., Burg, J-P.Iron isotope fractionation and the oxygen fugacity of the mantle.Science, Vol. 304, 5677, June 11, p. 1656.MantleGeothermobarometry
DS200512-1179
2005
Halliday, A.N.Williams, H.M., Peslier, A.H., McCammon, C., Halliday, A.N., Levasseur, S., Teutsch, N., Burg, J.P.Systematic iron isotope variations in mantle rocks and minerals: the effects of partial melting and oxygen fugacity.Earth and Planetary Science Letters, Advanced in press,MantleMelting
DS200512-1180
2005
Halliday, A.N.Williams, H.M., Peslier, A.H., McCammon, C., Halliday, A.N., Levasseur, S., Teutsch, N., Burg, J.P.Systematic iron isotope variations in mantle rocks and minerals. The effects of partial melting and oxygen fugacity.Earth and Planetary Science Letters, Vol. 235, 1-2, pp. 435-452.MantleGeochronology, melting
DS200612-0523
2006
Halliday, A.N.Halliday, A.N.The origin of the Earth .. What's new?Elements, Vol. 3, no. 4, August pp. 205-210.MantleGeochemistry, core, isotopes
DS201504-0199
2015
Halliday, A.N.Gannoun, A., Burton, K.W., Barfod, D.N., Schiano, P., Vlastelic, I., Halliday, A.N.Resolving mantle and magmatic processes in basalts from the Cameroon volcanic line using the Re-Os isotopic system.Lithos, Vol. 224-5, pp. 1-12.Africa, CameroonAlkaline rocks, basalts
DS201212-0155
2012
Halliday, M.De Sousa, H.A.F., Fedikow, M.A.F., Ryder, J., Turner, N., Halliday, M.Application of weak leaches in kimberlite exploration.10th. International Kimberlite Conference Feb. 6-11, Bangalore India, AbstractCanada, OntarioGeochemistry
DS201312-0356
2013
Hallis, L.J.Hallis, L.J., Huss, G.R., Taylor, D.R., Nagashima, K., Halldorsson, S.A., Hilton, D.R.The D/H ratio of the deep mantle.Goldschmidt 2013, AbstractMantleDeuterium/Hydrogen
DS201512-1924
2015
Hallis, L.J.Hallis, L.J., Huss, G.R., Nagashima, K., Taylor, G.J., Halldorsson, S.A.Evidence of primordial water in Earth's deep mantle.Science, Vol. 350, 6252 Nov. 13, pp. 795-797.MantleWater

Abstract: The hydrogen-isotope [deuterium/hydrogen (D/H)] ratio of Earth can be used to constrain the origin of its water. However, the most accessible reservoir, Earth’s oceans, may no longer represent the original (primordial) D/H ratio, owing to changes caused by water cycling between the surface and the interior. Thus, a reservoir completely isolated from surface processes is required to define Earth’s original D/H signature. Here we present data for Baffin Island and Icelandic lavas, which suggest that the deep mantle has a low D/H ratio (?D more negative than -218 per mil). Such strongly negative values indicate the existence of a component within Earth’s interior that inherited its D/H ratio directly from the protosolar nebula.
DS1991-0652
1991
Halliwell, J.E.Halliwell, J.E.Environment and scienceThe Canadian Mining and Metallurgical Bulletin (CIM Bulletin) , Special Feature on environment, Vol. 84, No. 952, Augustpp. 41-43CanadaEnvironment, Science
DS200712-0343
2007
Hallot, E.Galland, O., Cobbold, P.R., De Bremond d'Ars, J., Hallot, E.Rise and emplacement of magma during horizontal shortening of the brittle crust: insights from experiments.Journal of Geophysical Research, Vol. 112, B6 B06402MantleMagmatism
DS201312-0357
2014
Halls, H.Halls, H.Crustal shortening during the Paleoproterozoic: can it be accommodated by paleomagnetic data?Precambrian Research, Vol. 244, pp. 42-52.CanadaTrans-Hudson orogen, Slave craton
DS1970-0304
1971
Halls, H.C.Halls, H.C., West, G.F.A Seismic Refraction Survey in Lake SuperiorCanadian Journal of Earth Sciences, Vol. 8, PP. 610-630.GlobalMid-continent, Geophysics
DS1970-0521
1972
Halls, H.C.Halls, H.C.Magnetic Studies in Northern Lake SuperiorCanadian Journal of Earth Sciences, Vol. 9, No. 11, PP. 1349-1367.GlobalMid-continent, Geophysics
DS1975-0755
1978
Halls, H.C.Halls, H.C.The Late Precambrian North American Rift System- a Survey Of Recent Geological and Geophysical Investigations.In: Tectonics And Geophysics of Continental Rifts, Neumann, PP. 111-123.GlobalMid-continent
DS1975-1051
1979
Halls, H.C.Halls, H.C.Diatremes and Shock Features on Precambrian Rocks of the Slate Islands, Northeastern Lake Superior: Discussion.Geological Society of America (GSA) Bulletin., Vol. 90, No. 1, PP. 1084-1086.Canada, OntarioBlank
DS1982-0244
1982
Halls, H.C.Halls, H.C.Crustal Thickness in the Lake Superior RegionGeological Society of America (GSA) MEMOIR., No. 156, PP. 239-243.GlobalMid-continent
DS1984-0263
1984
Halls, H.C.Ernst, R.E., Halls, H.C.Structural and Palaeomagnetic Studies of Dikes in the Vicinity of the Kapuskasing Structural Zone, Northern Ontario.Geological Association of Canada (GAC), Vol. 9, P. 52. (abstract.).Canada, OntarioTectonics
DS1984-0264
1984
Halls, H.C.Ernst, R.E., Halls, H.C.Paleomagnetism of the Hearst Dike Swarm and Implications For the Tectonic History of the Kapuskasing Structural Zone, Northern Ontario.Canadian Journal of Earth Sciences, Vol. 21, No. 12, DECEMBER PP. 1499-1506.GlobalTectonics
DS1984-0265
1984
Halls, H.C.Ernst, R.E., Halls, H.C.Paleomagnetism of the Hearst dike swarm and implications for the tectonic history of Kapuskasing Structural Zone, northern Ontario.Canadian Journal of Earth Sciences, Vol. 21, pp. 1499-1506.OntarioTectonics - Structure, Ksz
DS1986-0335
1986
Halls, H.C.Halls, H.C.Paleomagnetism, structure and longitudinal correlation of middle Precambrian dykes from northwestern Ontario and MinnesotaCanadian Journal of Earth Sciences, Vol. 23, No. 2, February pp. 142-157Ontario, Great Lakes, MinnesotaDyke
DS1986-0631
1986
Halls, H.C.Palmer, H.C., Halls, H.C.Paleomagnetism of the Powder Mill group, Michigan and Wisconsin: are assessment of the Logan loopJournal of Geophysical Research, Vol. 91, No. B 11, October 10, pp. 11, 571-11, 580Michigan, WisconsinPaleomagnetism, Geophysics
DS1988-0286
1988
Halls, H.C.Halls, H.C., Shaw, E.G.Paleomagnetism and orientation of Precambrian dykes, eastern Lake Superiorregion, and their use in estimates of crustal tilting.Canadian Journal of Earth Sciences, Vol. 25, pp. 732-43.OntarioTectonics, Paleomagnetic - dike
DS1989-0574
1989
Halls, H.C.Halls, H.C., Bates, M.P., Palmer, H.C.Magnetic-polarity domains, structural domains,petrography andpaleomagnetism; their bearing on The origin and deformation of the early Prot.MatachewanNew Mexico Bureau of Mines Bulletin., Continental Magmatism Abstract Volume, Held, Bulletin. No. 131, p. 119. AbstractOntarioDyke, Geophysics
DS1989-0575
1989
Halls, H.C.Halls, H.C., Bates, W.Regional Hudsonian (?) deformation of the Superiorprovince:paleomagnetic evidence from 2.45 GA Matachewan dykes, OntarioGeological Association of Canada (GAC) Annual Meeting Program Abstracts, Vol. 14, p. A104. (abstract.)OntarioTectonics, Kapuskasing Lithoprobe
DS1989-0576
1989
Halls, H.C.Halls, H.C., Palmer, H.C.Magnetic polarity domains in the Matachewan dyke swarm and their relationship to the Kapuskasing structuralzoneGeological Association of Canada (GAC) Annual Meeting Program Abstracts, Vol. 14, p. A103. (abstract.)OntarioTectonics, Kapuskasing Lithoprobe
DS1990-0177
1990
Halls, H.C.Bates, M.P., Halls, H.C.Regional variation in paleomagnetic polarity of the Matachewan dyke swarm related to the Kapuskasing structural Zone, OntarioCanadian Journal of Earth Sciences, Vol. 27, No. 2, February pp. 200-211OntarioTectonics, Kapuskasing Structural Zo
DS1990-0640
1990
Halls, H.C.Halls, H.C., Bates, M.P.The evolution of the 2.45 Ga Matachewan dyke swarm, CanadaMafic dykes and emplacement mechanisms, Editors A.J. Parker, P.C., pp. 237-250OntarioDykes, Evolution
DS1990-0641
1990
Halls, H.C.Halls, H.C., Palmer, H.C.The tectonic relationship of two Early Proterozoic dyke swarms to the Kapuskasing Structural Zone: a paleomagnetic and petrographic studyCanadian Journal of Earth Sciences, Vol. 27, No. 1, January pp. 87-103OntarioTectonics, Kapuskasing Structural Zo
DS1991-0080
1991
Halls, H.C.Bates, M.P., Halls, H.C.Paleomagnetism of dykes from the Groundhog River Block, northern Ontario:implications for the uplift history of the Kapuskasing Structural ZoneCanadian Journal of Earth Sciences, Vol. 28, No. 9, September pp. 1424-1428OntarioGeophysics -paleomagnetics, Kapuskasing Structural Zone
DS1991-0081
1991
Halls, H.C.Bates, M.P., Halls, H.C.Broad scale Proterozoic deformation of the central Superior Province by paleomagnetism of the 2.45 Ga dykeCanadian Journal of Earth Sciences, Vol. 28, No. 11, November pp. 1780-1796OntarioPaleomagnetism, Dike swarm
DS1991-0082
1991
Halls, H.C.Bates, M.P., Halls, H.C.Broad scale Proterozoic deformation of the central Superior Province revealed by paleomagnetism of the 2.45 Ga Matachewan dyke swarmCanadian Journal of Earth Sciences, Vol. 28, pp. 1780-96.OntarioTrans Hudson Orogeny, Geophysics - paleomagnetics
DS1991-0653
1991
Halls, H.C.Halls, H.C.The Matachewan dyke swarm: outward growth from a focal centre?Geological Association of Canada (GAC)/Mineralogical Association of Canada/Society Economic, Vol. 16, Abstract program p. A50OntarioDykes, Tectonics
DS1991-0654
1991
Halls, H.C.Halls, H.C.The Matachewan dyke swarm, Canada: an early Proterozoic magnetic fieldreversalEarth and Planetary Science Letters, Vol. 105, pp. 279-292OntarioGeophysics -magnetics, Dyke swarm
DS1991-1847
1991
Halls, H.C.West, G.F., Halls, H.C.Aeromagnetic survey of the Ivan hoe Lake Fault zone Lithoprobe KSZtransectGeological Association of Canada (GAC)/Mineralogical Association of Canada/Society Economic, Vol. 16, Abstract program p. A131OntarioGeophsyics -aeromagnetics, Tectonics -Kapuskasing structural zone
DS1992-0991
1992
Halls, H.C.Manson, M.L., Halls, H.C.The geometry and sense of post-Keweenawan faults in eastern Lake Superior:implications for models of rift developmentEos Transactions, Vol. 73, No. 14, April 7, supplement abstracts p. 320OntarioMidcontinent Rift, Structure -faults
DS1992-1433
1992
Halls, H.C.Smith, P.E., Farquhar, R.M., Halls, H.C.U-Th-Ph isotope study of mafic dykes in the Superior province Ontario:uniformity of initial lead isotope ratios of the Hearst dykesChemical Geology, Vol. 94, No. 4, May 15, pp. 261-280OntarioGeochronology, Hearst dikes
DS1992-1735
1992
Halls, H.C.Zhai, Y.J., Halls, H.C.Paleomagnetism of the Molson Dykes and Pikwitonei granulites, NorthernManitobaEos Transactions, Vol. 73, No. 14, April 7, supplement abstracts p. 92ManitobaPaleomagnetics, Dykes
DS1992-1736
1992
Halls, H.C.Zhang, B., Halls, H.C.Does another thrust sheet lie above the Kapuskasing Zone?Eos Transactions, Vol. 73, No. 14, April 7, supplement abstracts p. 92OntarioTectonics, Kapuskasing Zone
DS1994-0702
1994
Halls, H.C.Halls, H.C., Palmer, H.C., et al.Constraints on the nature of the Kapuskasing structural zone from the studyof Proterozoic dyke swarms.Canadian Journal of Earth Sciences, Vol. 31, No. 7, July pp. 1182-1196.OntarioStructure, Tectonics -Kapuskasing uplift
DS1994-1098
1994
Halls, H.C.Manson, M.L., Halls, H.C.Post Keweenwan compressional faults in eastern Lake Superior region and their tectonic significance.Canadian Journal of Earth Sciences, Vol. 31, No. 4, April pp. 640-651.Ontario, MichiganGeophysics -seismics, Tectonics -Midcontinent rift
DS1994-1970
1994
Halls, H.C.Yonggian Zhai, Halls, H.C.Multiple episodes of dike emplacement along the northwestern margin of the Superior Province.Journal of Geophysical Research, Vol. 99, No. B11, Nov. 10, pp. 21, 717-732.ManitobaDikes, Molson swarm
DS1995-0732
1995
Halls, H.C.Halls, H.C.Variations in paleomagnetic direction and feldspar clouding intensity across Matachewan dyke swarm....Can. Min. Northern Margin S. Canadian shield, Vol. 33, p.935.OntarioGrenville Province, Matachewan dykes
DS1996-0185
1996
Halls, H.C.Buchan, K.L., Halls, H.C., Mortensen, J.K.Paleomagnetism uranium-lead (U-Pb) (U-Pb) geochronology, geochemistry of Marathon dykes, SuperiorProvince... Fort Frances swarmCanadian Journal of Earth Sciences, Vol. 33, No. 12, Dec. pp. 1583-95.OntarioDike swarm, Marathon, Frances
DS1997-0728
1997
Halls, H.C.Manson, M.L., Halls, H.C.Proterozoic reactivation of southern Superior Province and its role in the evolution of Midcontinent Rift.Canadian Journal of Earth Sciences, Vol. 34, No. 4, April, pp. 562-575.Michigan, WisconsinRifting, tectonics, Kapuskasing structural zone
DS1998-0563
1998
Halls, H.C.Halls, H.C., Mound, J.The McEwan Lake fault: gravity evidence for a new structural element of the Kapuskasing zone.Canadian Journal of Earth Sciences, Vol. 35, No. 6, June pp. 696-701.OntarioGeophysics - gravity, Kapuskasing Zone
DS1998-0564
1998
Halls, H.C.Halls, H.C., Zhang, B.Uplift structure of the southern Kapuskasing zone from 2.45 Ga dike swarmdisplacement.Geology, Vol. 26, No. 1, Jan. pp. 67-70.OntarioDike swarm, Kapuskasing tectonic zone
DS1999-0485
1999
Halls, H.C.Mitescu, B., Halls, H.C., Gubala, C.P.A gravity study of the northwestern boundary fault of the Kapuskasing structural Zone.Geological Association of Canada (GAC) Geological Association of Canada (GAC)/Mineralogical Association of Canada (MAC)., Vol. 24, p. 92. abstractOntarioTectonics, structure, Ivanhoe Fault, Midcontinent
DS1999-0599
1999
Halls, H.C.Riller, U., Schwerdtner, W.M., Halls, H.C., Card, K.D.Transpressive tectonism in the eastern Penokean orogen: consequences for Proterozoic crustal kinematics...Precambrian Research, Vol. 93, No. 1, Jan. pp. 27-50.GlobalTectonics - plate, Penokean Orogen
DS2000-0380
2000
Halls, H.C.Halls, H.C., Heaman, L.M.The paleomagnetic significance of new uranium-lead (U-Pb) age dat a from the Molson dike swarm, Causchon Lake area.Canadian Journal of Earth Sciences, Vol. 37, No. 6, June pp. 957-66.ManitobaGeochronology, Molson dyke swarm
DS2001-0437
2001
Halls, H.C.Halls, H.C., Campal, Davis, BossiMagnetic studies and uranium-lead (U-Pb) geochronology of the Uruguyuan dyke swarm, Rio de la Plat a Craton: paleomagJournal of South American Earth Sciences, Vol. 14, No. 4, Sept. pp. 349-61.UruguayGeophysics - magnetics, Dike swarms
DS2001-0918
2001
Halls, H.C.Phinney, W.C., Halls, H.C.Petrogenesis of the Early Proterozoic Matachewan dike swarm: implications for magma emplacement and deform.Canadian Journal of Earth Science, Vol. 38, No. 11, Nov. pp. 1541-63.OntarioMagmatism, Dyke Swarm - Matachewan
DS2002-1142
2002
Halls, H.C.Nitescu, B., Halls, H.C.A gravity profile across southern Saganash lake fault: implications for the origin of Kapuskasing structuralCanadian Journal of Earth Science, Vol.39,4,Apr.pp.469-80., Vol.39,4,Apr.pp.469-80.OntarioGeophysics - gravity, Tectonics - Kapuskasing Structural Zone
DS2002-1143
2002
Halls, H.C.Nitescu, B., Halls, H.C.A gravity profile across southern Saganash lake fault: implications for the origin of Kapuskasing structuralCanadian Journal of Earth Science, Vol.39,4,Apr.pp.469-80., Vol.39,4,Apr.pp.469-80.OntarioGeophysics - gravity, Tectonics - Kapuskasing Structural Zone
DS2003-0535
2003
Halls, H.C.Halls, H.C., Stott, G.M.Paleomagnetic Studies of Mafic Dikes in the Vicinity of Lake Nipigon, NorthwesternOntario Geological Survey, Summary of Field Work and Other Activities Article 11northwestern OntarioBlank
DS2003-0536
2003
Halls, H.C.Halls, H.C., Stott, G.M.Paleomagnetic studies of mafic dikes in the vicinity of Lake Nipigon northwesternOntario Geological Survey Open File, No. 6120, pp. 11 1-7.OntarioDike - Matachewan
DS2003-0537
2003
Halls, H.C.Halls, H.C., Zhang, B.Crustal uplift in the southern Superior Province, Canada revealed by paleomagnetismTectonophysics, Vol. 362, 1-4, pp. 123-46.Ontario, ManitobaTectonics
DS200412-0766
2004
Halls, H.C.Halls, H.C., Davis, D.W.Paleomagnetism and U Pb geochronology of the 2.17 Ga Bicotasing dyke swarm, Ontario, Canada: evidence for vertical axis crustalCanadian Journal of Earth Sciences, Vol. 41, 3, pp. 255-269.Canada, OntarioGeochronology, Matachewan dyke swarm
DS200412-0767
2004
Halls, H.C.Halls, H.C., McArdle, N.J., Gratton, M.N., Hill, M.J., Shaw, J.Microwave paleointensities from dyke chilled margins: a way to obtain long term variations in geodynamo intensity for the last tPhysics of the Earth and Planetary Science Interiors, Vol. 147, 2-3, Nov. 15, pp.183-195.Canada, OntarioMattachewan dyke swarm, geochronology, Biscotasing, Mar
DS200412-0768
2003
Halls, H.C.Halls, H.C., Stott, G.M.Paleomagnetic studies of mafic dikes in the vicinity of Lake Nipigon northwestern Ontario.Ontario Geological Survey Open File, No. 6120, pp. 11 1-7.Canada, OntarioDike - Matachewan
DS200512-0232
2005
Halls, H.C.Denyszyn, S.W., Halls, H.C., Davis, D.W.Paleomagnetic geochemical and U Pb geochronological study of Proterozoic dykes in Greenland and Arctic Canada and their role in plate tectonic reconstruction.GAC Annual Meeting Halifax May 15-19, Abstract 1p.Europe, GreenlandTectonics
DS200512-0393
2005
Halls, H.C.Halls, H.C., Davis, D.W., Stott, G.M.Paleomagnetism and U Pb dating of Proterozoic dykes: a new radiation swarm and an increase in post Archean crustal rotation westwards from the Kapuskasing zone.GAC Annual Meeting Halifax May 15-19, Abstract 1p.Canada, Ontario, Attawapiskat, James Bay LowlandsGeochronology, Kapuskasing
DS200512-0394
2005
Halls, H.C.Halls, H.C., Stott, G.M., Davis, D.W.Paleomagnetism, geochronology and geochemistry of several Proterozoic mafic dike swarms in northwestern Ontario.Ontario Geological Survey, Open file 6171, 59p. $ 9.00Canada, OntarioDike swarms
DS200812-0443
2008
Halls, H.C.Halls, H.C., Davis, D.W., Stott, G.M., Ernst, R.E., Hamilton, M.A.The Paleoproterozoic Marathon large igneous province: new evidence for a 2.1 Ga long lived mantle plume event along the southern margin of the N.A. Superior ProvincePrecambrian Research, Vol. 162, 3-4, pp. 327-353.Canada, OntarioMantle plume
DS201012-0261
2010
Halls, H.C.Halls, H.C.The Reguibat shield, Mauritania: a dyke swarm bonanza?International Dyke Conference Held Feb. 6, India, 1p. AbstractAfrica, Mauritania, MoroccoDyke morphology
DS201012-0262
2010
Halls, H.C.Halls, H.C., Lovette, A., Soderlund, U., Hamilton, M.A.Paleomagnetism and U Pb geochronology from the western end of the Grenville dyke swarm and the question of true polar wander during the Ediacaran.International Dyke Conference Held Feb. 6, India, 1p. AbstractUnited States, CanadaAlkaline rocks, complexes
DS1950-0135
1953
Hallsberg Guldsmedsaktiebolag, C.G.Hallsberg Guldsmedsaktiebolag, C.G.Adla Stenar. Nagra Ord Om Adelstenen Som Smyckesten UitginenStockholm., 51P.GlobalKimberley
DS1999-0281
1999
Hallsworth, C.R.Hallsworth, C.R., Knox, R.W. O'b.Classification of sediments and sedimentary rocksBritish Geological Survey, No. 99-03, 45p.p.GlobalClassification - sedimentary rocks
DS200412-0769
1999
Hallsworth, C.R.Hallsworth, C.R., Knox, R.W.O'b.Classification of sediments and sedimentary rocks.British Geological Survey, No. 99-03, 45p.p.TechnologyClassification - sedimentary rocks
DS1993-1518
1993
HallworthSparks, R.S., Huppert, Koyaguchi, HallworthOrigin of modal and rhthmic igneous layering by sedimentation in aconvecting magma chamber.Nature, Vol. 361, Jan. 21, pp. 246-8.GlobalMagmatism - convection
DS1992-0104
1992
Hallworth, M.A.Bedard, J.H., Kerr, R.C., Hallworth, M.A.Porous sidewall and sloping flow crystallization experiments using a relative mush: implications for the self-channelization of residual melts incumulatesEarth and Planetary Science Letters, Vol. 111, No. 2/4, July pp. 319-330GlobalCrust, Layering, differentiation, cumulates
DS1993-0621
1993
Hallworth, M.A.Hallworth, M.A., Phillips, J.C., Huppert, H.E., Sparks, R.S.J.Entrainment in turbulent gravity currentsNature, Vol. 362, No. 6423, April 29, pp. 829-830GlobalSedimentation
DS1988-0221
1988
Halpenny, J.Forsyth, D.A., Thomas, M.D., Broome, J., Abbinett, D., Halpenny, J.Regional geophysics of the central metasedimentary beltGeological Society of America (GSA) Abstract Volume, Vol. 20, No. 5, March p. 344. abstractGlobalBlank
DS1989-1217
1989
Halpenny, J.F.Pilkington, M., Grieve, R.A.F., Gibb, R.A., Halpenny, J.F.Derived potential field dat a sets for North AmericaGeological Society of Canada (GSC) Forum 1989, P. 20 abstractGlobalMidcontinent, Geophysics
DS1989-1418
1989
Halpenny, J.F.Sobczak, L.W., Halpenny, J.F., Thomas, M.D.An enhanced residual isostatic anomaly map of Canada: a new perspective for crustal investigationsGeological Society of Canada (GSC) Forum 1989, P. 22 abstractGlobalMidcontinent, Seismics
DS201012-0263
2010
Halpin, K.Halpin, K., Ansdell, K., Pearson, J.The characteristics and origin of Great Western Minerals Group Ltd.'s Hoidas Lake REE deposit, Rae province, Northwestern Saskatchewan.International Workshop Geology of Rare Metals, held Nov9-10, Victoria BC, Open file 2010-10, extended abstract pp.45.Canada, SaskatchewanAlkalic
DS200812-0438
2008
Halter, W.Guzmics, T., Zajacz, Z., Kodoenyi, J., Halter, W., Szabo, C.LA ICP MS study of apatite and K feldspar hosted primary carbonatite melt inclusions in clinopyroxenite xenoliths from lamprophyres, Hungary: implicationsGeochimica et Cosmochimica Acta, Vol. 72, 7, pp. 1864-1886.Mantle, Europe, HungaryCarbonatite, melts
DS2002-0639
2002
Halter, W.E.Halter, W.E., Pettke, T., Heinrich, RothenRutishauserMajor to trace element analysis of melt inclusions by laser ablation ICP MS methods of quantification.Chemical Geology, Vol.183, 1-4, pp.63-86.MantleMelt, Geochemistry - techniques, Inductively Coupled Plasma- Mass
DS201812-2823
2018
Halton, A.Jerram, D.A., Sharp, T.H., Torsvik, T.H., Poulson, R., Watton, T.H., Freitag, U., Halton, A., Sherlock, S.C., Malley, J.A.S., Finley, A., Roberge, J., Swart, R., Fabregas, P., Ferreira, C.H., Machado, V.Volcanic constraints on the unzipping of Africa from South America: insights from new geochronological controls alone the Angola margin.Tectonophysics, doi.org/10.1016/ j.tecto.2018.07.027 33p.Africa, Angola, South Americageochronology

Abstract: The breakup of Africa from South America is associated with the emplacement of the Paraná-Etendeka flood basalt province from around 134 Ma and the Tristan da Cunha plume. Yet many additional volcanic events occur that are younger than the main pulse of the Paraná-Etendeka and straddle the rift to drift phases of the main breakup. This contribution reports on new geochronological constraints from the Angolan part of the African Margin. Three coastal and one inland section have been sampled stretching across some 400 Km, with 39Ar/40Ar, U-Pb and Palaeontology used to provide age constraints. Ages from the new data range from ~100 to 81 Ma, with three main events (cr. 100, 91 and 82-81 Ma). Volcanic events are occurring within the Early to Late Cretaceous, along this part of the margin with a general younging towards Namibia. With the constraints of additional age information both onshore and offshore Angola, a clear younging trend at the early stages of rift to drift is recorded in the volcanic events that unzip from North to South. Similar age volcanic events are reported from the Brazilian side of the conjugate margin, and highlight the need to fully incorporate these relatively low volume volcanic pulses into the plate tectonic breakup models of the South Atlantic Margin.
DS1920-0444
1929
Halton, W.L.Halton, W.L.Magnet Cove Arkansaw and VicinityAmerican MINERALOGIST., Vol. 14, No. 12, PP. 484-487.United States, Gulf Coast, Arkansas, Hot Spring CountyMineralogy
DS201606-1076
2016
Haluzova, E.Ackerman, L., Bizimis, M., Haluzova, E., Slama, J., Svojtka, M.Re-Os and Lu-Hf isotopic constraints on the formation and age of mantle pyroxenites from the Bohemian Massif.Lithos, Vol. 256-257, pp. 197-210.Europe, Czech Republic, AustriaPyroxenite

Abstract: We report on the Lu-Hf and Re-Os isotope systematics of a well-characterized suite of spinel and garnet pyroxenites from the Gföhl Unit of the Bohemian Massif (Czech Republic, Austria). Lu-Hf mineral isochrons of three pyroxenites yield undistinguishable values in the range of 336-338 Ma. Similarly, the slope of Re-Os regression for most samples yields an age of 327 ± 31 Ma. These values overlap previously reported Sm-Nd ages on pyroxenites, eclogites and associated peridotites from the Gföhl Unit, suggesting contemporaneous evolution of all these HT-HP rocks. The whole-rock Hf isotopic compositions are highly variable with initial ?Hf values ranging from ? 6.4 to + 66. Most samples show a negative correlation between bulk rock Sm/Hf and ?Hf and, when taking into account other characteristics (e.g., high 87Sr/86Sr), this may be explained by the presence of recycled oceanic sediments in the source of the pyroxenite parental melts. A pyroxenite from Horní Kounice has decoupled Hf-Nd systematics with highly radiogenic initial ?Hf of + 66 for a given ?Nd of + 7.8. This decoupling is consistent with the presence of a melt derived from a depleted mantle component with high Lu/Hf. Finally, one sample from Be?váry plots close to the MORB field in Hf-Nd isotope space consistent with its previously proposed origin as metamorphosed oceanic gabbro. Some of the websterites and thin-layered pyroxenites have variable, but high Os concentrations paralleled by low initial ?Os. This reflects the interaction of the parental pyroxenitic melts with a depleted peridotite wall rock. In turn, the radiogenic Os isotope compositions observed in most pyroxenite samples is best explained by mixing between unradiogenic Os derived from peridotites and a low-Os sedimentary precursor with highly radiogenic 187Os/188Os. Steep increase of 187Os/188Os at nearly uniform 187Re/188Os found in a few pyroxenites may be connected with the absence of primary sulfides, but the presence of minor late stage sulfide-bearing veinlets likely associated with HT-HP metamorphism at crustal conditions.
DS201710-2209
2017
Haluzova, E.Ackerman, L., Slama, J., Haluzova, E., Magna, T., Rapprich, V., Kochergin, Y., Upadhyay, D.Hafnium isotope systematics of carbonatites and alkaline silicate rocks from south and west India.Goldschmidt Conference, 1p. AbstractIndiadeposit - Amba Dongar
DS1960-0836
1967
Halverson, B.Halverson, B.Diamonds for Free - MaybeEnterprise Records, Chico, California., SEPTEMBER 2.United States, California, West CoastKimberlite
DS1998-0628
1998
Halverson, G.P.Hoffman, P.F., Kaufman, A.J., Halverson, G.P.Comings and goings of global glaciations on a Neoproterozoic tropical platform in Namibia.Gsa Today, Vol. 8, No. 5, May pp. 1-9.NamibiaGeomorphology, Glacial deposits.... not specific to diamonds
DS201201-0848
2011
Halverson, G.P.Hoffman, P., Macdonald, F.A., Halverson, G.P.Chemical sediments association with Neoproterozoic glaciation: iron formation cap carbonate, barite and phosphorite.The Geological Record of Neoproterozoic glaciations, Memoirs 2011; Vol. 36, pp. 67-80GlobalGeomorphology - geochemistry
DS201201-0849
2011
Halverson, G.P.Hoffman, P.F., Halverson, G.P.Neoproterozoic glacial record in the Mackenzie Mountains, northern Canadian Cordillera.The Geological Record of Neoproterozoic glaciations, Memoirs 2011; Vol. 36, pp. 397-412.CanadaGeomorphology
DS201312-0538
2013
Halverson, G.P.Li, Z-X., Evans, D.AD., Halverson, G.P.Neoproterozoic glaciations in a revised global paleogeography from the breakup of Rodinia to the assembly of Gondwanaland.Sedimentary Geology, Vol. 294, pp. 219-232.Gondwana, RodiniaReview
DS202108-1285
2021
Halverson, G.P.Greenman, J.W., Rooney, A.D., Patzke, M., Ielpi, A., Halverson, G.P.Re-Os geochronology highlights widespread latest Mesoproterozoic ( ca 1090-1050 Ma) cratonic basin development on northern Laurentia.Geology, Vol. 49, March pp. 779-783.Canada, Greenlandgeochronology

Abstract: The terminal Mesoproterozoic was a period of widespread tectonic convergence globally, culminating in the amalgamation of the Rodinia supercontinent. However, in Laurentia, long-lived orogenesis on its eastern margin was punctuated by short-lived extension that generated the Midcontinent Rift ca. 1110-1090 Ma. Whereas this cratonic rift basin is typically considered an isolated occurrence, a series of new depositional ages demonstrate that multiple cratonic basins in northern Laurentia originated around this time. We present a Re-Os isochron date of 1087.1 ± 5.9 Ma from organic-rich shales of the Agu Bay Formation of the Fury and Hecla Basin, which is one of four closely spaced cratonic basins spanning from northeastern Canada to northwestern Greenland known as the Bylot basins. This age is identical, within uncertainty, to ages from the Midcontinent Rift and the Amundsen Basin in northwestern Canada. These ages imply that the late Mesoproterozoic extensional episode in Laurentia was widespread and likely linked to a common origin. We propose that significant thermal anomalies and mantle upwelling related to supercontinent assembly centered around the Midcontinent Rift influenced the reactivation of crustal weaknesses in Arctic Laurentia beginning ca. 1090 Ma, triggering the formation of a series of cratonic basins.
DS202109-1472
2021
Halverson, G.P.Hoffman, P.F., Halverson, G.P., Schrag, D.P., Higgins, J.A., Domack, E.W., Macdonald, F.A., Pruss, S.B., Blattler, C.L., Crockford, P.W., Hodgin, E.B., Bellefroid, E.J., Johnson, B.W., Hodgskiss, M.S.W., Lamothe, K.G., LoBianco, S.J.C., Busch, J.F., HowesSnowballs in Africa: sectioning a long-lived Neoproterozoic carbonate platform and its bathyal foreslope ( NW Namibia). (Octavi Group)Earth Science Reviews , Vol. 219, 103616 231p. PdfAfrica, NamibiaCraton - Congo

Abstract: Otavi Group is a 1.5-3.5-km-thick epicontinental marine carbonate succession of Neoproterozoic age, exposed in an 800-km-long Ediacaran?Cambrian fold belt that rims the SW cape of Congo craton in northern Namibia. Along its southern margin, a contiguous distally tapered foreslope carbonate wedge of the same age is called Swakop Group. Swakop Group also occurs on the western cratonic margin, where a crustal-scale thrust cuts out the facies transition to the platformal Otavi Group. Subsidence accommodating Otavi Group resulted from S?N crustal stretching (770-655?Ma), followed by post-rift thermal subsidence (655-600?Ma). Rifting under southern Swakop Group continued until 650-635?Ma, culminating with breakup and a S-facing continental margin. No hint of a western margin is evident in Otavi Group, suggesting a transform margin to the west, kinematically consistent with S?N plate divergence. Rift-related peralkaline igneous activity in southern Swakop Group occurred around 760 and 746?Ma, with several rift-related igneous centres undated. By comparison, western Swakop Group is impoverished in rift-related igneous rocks. Despite low paleoelevation and paleolatitude, Otavi and Swakop groups are everywhere imprinted by early and late Cryogenian glaciations, enabling unequivocal stratigraphic division into five epochs (period divisions): (1) non-glacial late Tonian, 770-717?Ma; (2) glacial early Cryogenian/Sturtian, 717-661?Ma; (3) non-glacial middle Cryogenian, 661-646?±?5?Ma; (4) glacial late Cryogenian/Marinoan, 646?±?5-635?Ma; and (5) non-glacial early Ediacaran, 635-600?±?5?Ma. Odd numbered epochs lack evident glacioeustatic fluctuation; even numbered ones were the Sturtian and Marinoan snowball Earths. This study aimed to deconstruct the carbonate succession for insights on the nature of Cryogenian glaciations. It focuses on the well-exposed southwestern apex of the arcuate fold belt, incorporating 585?measured sections (totaling >190?km of strata) and?>?8764 pairs of ?13C/?18Ocarb analyses (tabulated in Supplementary On-line Information). Each glaciation began and ended abruptly, and each was followed by anomalously thick ‘catch-up’ depositional sequences that filled accommodation space created by synglacial tectonic subsidence accompanied by very low average rates of sediment accumulation. Net subsidence was 38% larger on average for the younger glaciation, despite its 3.5-9.3-times shorter duration. Average accumulation rates were subequal, 4.0 vs 3.3-8.8?m Myr?1, despite syn-rift tectonics and topography during Sturtian glaciation, versus passive-margin subsidence during Marinoan. Sturtian deposits everywhere overlie an erosional disconformity or unconformity, with depocenters ?1.6?km thick localized in subglacial rift basins, glacially carved bedrock troughs and moraine-like buildups. Sturtian deposits are dominated by massive diamictite, and the associated fine-grained laminated sediments appear to be local subglacial meltwater deposits, including a deep subglacial rift basin. No marine ice-grounding line is required in the 110 Sturtian measured sections in our survey. In contrast, the newly-opened southern foreslope was occupied by a Marinoan marine ice grounding zone, which became the dominant repository for glacial debris eroded from the upper foreslope and broad shallow troughs on the Otavi Group platform, which was glaciated but left nearly devoid of glacial deposits. On the distal foreslope, a distinct glacioeustatic falling-stand carbonate wedge is truncated upslope by a glacial disconformity that underlies the main lowstand grounding-zone wedge, which includes a proximal 0.60-km-high grounding-line moraine. Marinoan deposits are recessional overall, since all but the most distal overlie a glacial disconformity. The Marinoan glacial record is that of an early ice maximum and subsequent slow recession and aggradation, due to tectonic subsidence. Terminal deglaciation is recorded by a ferruginous drape of stratified diamictite, choked with ice-rafted debris, abruptly followed by a syndeglacial-postglacial cap-carbonate depositional sequence. Unlike its Sturtian counterpart, the post-Marinoan sequence has a well-developed basal transgressive (i.e., deepening-upward) cap dolomite (16.9?m regional average thickness, n?=?140) with idiosyncratic sedimentary features including sheet-crack marine cements, tubestone stromatolites and giant wave ripples. The overlying deeper-water calci-rhythmite includes crystal-fans of former aragonite benthic cement ?90?m thick, localized in areas of steep sea-floor topography. Marinoan sequence stratigraphy is laid out over ?0.6?km of paleobathymetric relief. Late Tonian shallow-neritic ?13Ccarb records were obtained from the 0.4-km-thick Devede Fm (~770-760?Ma) in Otavi Group and the 0.7-km-thick Ugab Subgroup (~737-717?Ma) in Swakop Group. Devede Fm is isotopically heavy, +4-8‰ VPDB, and could be correlative with Backlundtoppen Fm (NE Svalbard). Ugab Subgroup post-dates 746?Ma volcanics and shows two negative excursions bridged by heavy ?13C values. The negative excursions could be correlative with Russøya and Garvellach CIEs (carbon isotope excursions) in NE Laurentia. Middle Cryogenian neritic ?13C records from Otavi Group inner platform feature two heavy plateaus bracketed by three negative excursions, correlated with Twitya (NW Canada), Taishir (Mongolia) and Trezona (South Australia) CIEs. The same pattern is observed in carbonate turbidites in distal Swakop Group, with the sub-Marinoan falling-stand wedge hosting the Trezona CIE recovery. Proximal Swakop Group strata equivalent to Taishir CIE and its subsequent heavy plateau are shifted bidirectionally to uniform values of +3.0-3.5‰. Early Ediacaran neritic ?13C records from Otavi Group inner platform display a deep negative excursion associated with the post-Marinoan depositional sequence and heavy values (??+?11‰) with extreme point-to-point variability (?10‰) in the youngest Otavi Group formation. Distal Swakop Group mimics older parts of the early Ediacaran inner platform ?13C records, but after the post-Marinoan negative excursion, proximal Swakop Group values are shifted bidirectionally to +0.9?±?1.5‰. Destruction of positive and negative CIEs in proximal Swakop Group is tentatively attributed to early seawater-buffered diagenesis (dolomitization), driven by geothermal porewater convection that sucks seawater into the proximal foreslope of the platform. This hypothesis provocatively implies that CIEs originating in epi-platform waters and shed far downslope as turbidites are decoupled from open-ocean DIC (dissolved inorganic carbon), which is recorded by the altered proximal Swakop Group values closer to DIC of modern seawater. Carbonate sedimentation ended when the cratonic margins collided with and were overridden by the Atlantic coast-normal Northern Damara and coast-parallel Kaoko orogens at 0.60-0.58?Ga. A forebulge disconformity separates Otavi/Swakop Group from overlying foredeep clastics. In the cratonic cusp, where the orogens meet at a right angle, the forebulge disconformity has an astounding ?1.85?km of megakarstic relief, and km-thick mass slides were displaced gravitationally toward both trenches, prior to orogenic shortening responsible for the craton-rimming fold belt.
DS1989-0749
1989
Halvorson, D.Karner, F.R., Halvorson, D., Jenner, G.A., White, S.F.Devils Tower-Black Hills alkalic igneous rock sand general geology. July1-7thAmerican Geophysical Union (AGU) 28th. International Geological Congress Field Trip Guidebook, No. T131, 88pWyomingBear Lodge Mountains, Alkaline rocks
DS1991-0721
1991
Halways, L.E.Hodgins, B.L., Halways, L.E.Rotary blasthole drills: future trendsSkillings Mining Review, Vol. 80, No. 15, April 13, pp. 4-7GlobalDrilling, Rotary blastholes -open pit Mines
DS1983-0418
1983
Ham, E.A.Luza, K.V., Ham, E.A., Sanders, P.R.Indexes to Surface and Subsurface Geologic Mapping in Oklahoma 1977-1979.Oklahoma Geological Survey Map, No. GM 26, S HEETS.OklahomaMid Continent
DS2001-0438
2001
Ham, N.M.Ham, N.M.Welcome to the DIAND Nunavut mineral resources section... brief outline29th. Yellowknife Geoscience Forum, Nov. 21-23, abstract p. 24-5.Northwest Territories, NunavutBlank
DS1960-0837
1967
Ham, W.E.Ham, W.E., Wilson, J.L.Paleozoic Epeirogeny and Orogeny in the Central United StateAmerican Journal of SCIENCE., Vol. 265, PP. 332-407.GlobalMid-continent
DS1998-0565
1998
Hama, J.Hama, J., Suito, K.Equation of state of MgSiO3 perovskite and its thermoelastic properties under lower mantle conditions.Journal of Geophysical Research, Vol. 103, No. 4, Apr. 10, pp. 7443-62.MantlePerovskite
DS2001-0439
2001
Hama, J.Hama, J., Suito, K.Thermoelastic models of minerals and the composition of the Earth's lower mantle.Physical Earth and Planetary Interiors, Vol. 125, No. 1-4, pp. 147-66.MantleMineralogy
DS200812-0785
2008
Hamada, C.Nakakuki, T., Hamada, C., Tagawa, M.Generation and driving forces of plate like motion and asymmetric subduction in dynamical models of an integrated mantle lithosphere system.Physics of the Earth and Planetary Interiors, Vol. 166, 3-4, pp. 128-146.MantleSubduction
DS1992-1515
1992
Hamaguchi, H.Tanaka, S., Hamaguchi, H.Heterogeneity in the lower mantle beneath Africa, as revealed from S and ScS phasesTectonophysics, Vol. 209, pp. 213-222Southern AfricaMantle, Geophysics-gravity
DS1975-0095
1975
Haman, P.J.Haman, P.J.A Lineament Analysis of the United StatesWest Can. Publishing Co., SER. 4, No. 1, 27P.GlobalMid-continent
DS1975-0287
1976
Haman, P.J.Haman, P.J.Angular and Spatial Relationships of Land sat Lineaments of The United States.Proceedings SECOND International CONFERENCE ON BASEMENT TECTONICS, No. 2, PP. 353- 360.GlobalMid-continent
DS200612-1263
2006
Hamane, D.Seto, Y., Hamane, D., Nagai, T., Fujino, K.The fate of carbonates with subducted slabs into the lower mantle and a possible formation of diamonds.International Mineralogical Association 19th. General Meeting, held Kobe, Japan July 23-28 2006, Abstract p. 130.MantleDiamond genesis, subduction
DS200712-1061
2006
Hamane, D.Takafuji, N., Fujino, K., Nagai, T., Seto, Y., Hamane, D.Decarbonation reaction of magnesite in subduction slabs at the lower mantle.Physics and Chemistry of Minerals, Vol. 33, 10, pp. 651-654.MantleSubduction
DS200712-1062
2006
Hamane, D.Takafuji, N., Fujino, K., Nagai, T., Seto, Y., Hamane, D.Decarbonation reaction of magnesite in subducting slabs at the lower mantle.Physics and Chemistry of Minerals, Vol. 33, 10, pp. 651-654.MantleSubduction
DS200812-1042
2008
Hamane, D.Seto, Y., Hamane, D., Nagai, T., Fujino, K.Fate of carbonates within oceanic plates subducted to the lower mantle, and a possible mechanism of diamond formation.Physics and Chemistry of Minerals, Vol. 35, 4, pp. 223-229.MantleUHP, Diamond genesis
DS2001-1137
2001
Hamano, Y.Sumita, I., Hatakeyama, T., Yoshihara, A., Hamano, Y.Paleomagnetism of late Archean rocks of Hamersley basin, western Australia and the paleointensity...Physics of the Earth and Planetary Interiors, Vol. 128, No. 1-4, Dec. 10, pp. 223-41.AustraliaPaleomagnetism, Early Proterozoic
DS200412-1462
2004
Hamaya, N.Okada, T., Utsumi, W., Kaneko, H., Turkevich, V., Hamaya, N., Shimomura, O.Kinetics of the graphite diamond transformation in aqueous fluid determined by in situ X ray diffractions at high pressures andPhysics and Chemistry of Minerals, Vol. 31, 4, pp. 261-268.TechnologyUHP
DS200912-0752
2009
Hamayun, K.Tenzer, R., Hamayun, K., Vajda, P.Global maps of the CRUST 2.0 crustal components stripped gravity disturbances.Journal of Geophysical Research, Vol. 114, B05408.MantleGeophysics - discontinuity
DS201502-0118
2015
Hamayun, M.van der Meijde, M., Fadel, I., Ditmar, P., Hamayun, M.Uncertainties in crustal thickness models for dat a sparse environments: a review for South America and Africa.Journal of Geodynamics, Vol. 84, 1, pp. 1-18.South America, AfricaGeophysics - seismics
DS2003-0932
2003
hamberlain, C.P.Meibom, A., Anderson, D.L., Sleep, N.H., Frei, R., hamberlain, C.P., Hren, M.T.Are high 3He 4He ratios in oceanic basalts an indicator of deep mantle plumeEarth and Planetary Science Letters, Vol. 208, 3-4, March 30, pp.197-204.MantleGeochronology
DS200412-1292
2003
hamberlain, C.P.Meibom, A., Anderson, D.L., Sleep, N.H., Frei, R., hamberlain, C.P., Hren, M.T., Wooden, J.L.Are high 3He 4He ratios in oceanic basalts an indicator of deep mantle plume components?Earth and Planetary Science Letters, Vol. 208, 3-4, March 30, pp.197-204.MantleGeochronology
DS200812-0465
2008
Hambidge, G.Herbst, J., Potapov, A., Hambidge, G., Rademan, J.Modeling of diamond liberation and damage for Debswana kimberlitic ores.Minerals Engineering, Vol. 21, 11, October pp. 766-789.Africa, BotswanaMining - mineral processing
DS1950-0213
1955
Hambleton, W.W.Hambleton, W.W.Magnetic Anomalies in Wilson and Woodson Counties, KansasKansas Geological Survey Bulletin, No. 114, PT. 3, PP. 114-128.United States, Kansas, Central StatesKimberlite, Geophysics
DS2001-1125
2001
HamblinStasiuk, L.D., Sweet, A.R., Hamblin, Issler, Dyck, KiviUpdate on multidisciplinary study of sedimentary cover sequence Lac de Gras kimberlite field.29th. Yellowknife Geoscience Forum, Nov. 21-23, abstract p. 81.Northwest TerritoriesPetrology - geochemistry, Lac de Gras field
DS2001-1145
2001
HamblinSweet, A.R., Stasiuk, McIntyre, Dolby, Hamblin, KiviStratigraphy of the eroded sedimentary cover recorded by xenoliths and crater fill sediments associated....29th. Yellowknife Geoscience Forum, Nov. 21-23, abstract p. 86-7.Northwest TerritoriesStratigraphy, Lac de Gras field
DS2003-0538
2003
Hamblin, A.P.Hamblin, A.P., Stasiuk, L.D., Sweet, L.D., Lockhart, G., Dyck, D.R., Jagger, K.Post kimberlite Eocene strat a in Crater Basin, Lac de Gras, Northwest Territories8ikc, Www.venuewest.com/8ikc/program.htm, Session 1 POSTER abstractNorthwest TerritoriesKimberlite geology and economics, Stratigraphy
DS1860-0752
1892
Hambly, W.Hambly, W.The Discovery of Diamond Mining in South AfricaMining Association And Institute of Cornwall Transactions, Vol. 3, PP. 74-76.Africa, South AfricaHistory
DS200612-0251
2006
Hambrey, M.J.Christofferesen, P., Hambrey, M.J.Is the Greenland ice sheet in a state of collapse.Geology Today, Vol. 22, 3, pp. 98-103.Europe, GreenlandGeomorphology
DS202108-1291
2021
Hambrey, M.J.Jennings, S.J.A., Hambrey, M.J.Structures and deformation in glaciers and ice sheetsReviews of Geophysics, e2021RG000743 1Globalgeomorphology

Abstract: The major structures in the long, narrow tongue of a sub-polar valley glacier are described: namely, longitudinal foliation, crevasses, clear-ice layers related to crevasses, debris-rich layers (frequently referred to as thrust or shear planes in the past), and folds. The foliation is vertical, is as well-developed in the centre of the glacier as at the margins, and does not, apparently, form perpendicular to the principal compressive strain-rate axis, nor exactly parallel to a line of maximum shearing strain-rate, although it sometimes approximately coincides with the latter. The intensity of foliation development is not related to the magnitude of the strain-rates, but the structure consistently lies parallel to flow lines through the glacier. There is no critical extending strain-rate, as such, associated with the development of new crevasses. Some crevasses have formed where the principal extending strain-rate is as low as 0.004 a-1 while, in other areas, extending strain-rates of 0.163 a-1 have not always resulted in fracturing. Prominent clear-ice layers, referred to as crevasse traces as displayed at the glacier surface, have formed in crevasse belts parallel to the main fracture directions. These are interpreted either as tensional veins or as the result of the freezing of water in crevasses. Extension parallel to the layering occurs during flow and, near the snout, the surface dip decreases rapidly. The fact that the crevasse traces can be followed to the snout implies that fracture occurs almost to the bottom of the glacier in the source area of the traces. Near the snout, debris-rich layers have developed parallel to the crevasse traces; frequently these are marked by prominent ridge-like ice-cored moraines. It is suggested that these structures are formed by a combination of basal freezing and thrusting. Isoclinal and tight similar folds on all scales are present. Some may be formed by the passive deformation of clear-ice layers as a result of differential flow; others may arise from the lateral compression of the original stratification in areas where ice flow becomes constricted by the narrowing of the valley. An axial plane foliation sometimes is associated with these folds.
DS1998-0945
1998
Hamburger, M.Marshak, S., Hamburger, M., Van der Pluijm, B.Tectonics of continental interiors..... Penrose Conference ReportGsa Today, Vol. 8, No. 2, Feb. pp. 23-24GlobalTectonics, Precambrian
DS1998-0946
1998
Hamburger, M.Marshak, S., Hamburger, M., Van der Pluijm, B.A.Tectonics of continental interiors. Penrose Conference reportGsa Today, Vol. 8, No. 2, Feb. pp. 23-24.GlobalContinental interior, Precambrian, Craton
DS201706-1095
2017
Hamburger, M.Marshak, S., Domrois, S., Abert, C., Larson, T., Pavlis, G., Hamburger, M., Yang, X., Gilbert, H., Chen, C.The basement revealed: tectonic insight from a digital elevation model of the Great Unconformity, USA cratonic platform.Geology, Vol. 45, 5, pp. 391-394.United Statestectonics - Mid continent

Abstract: Across much of North America, the contact between Precambrian basement and Paleozoic strata is the Great Unconformity, a surface that represents a >0.4 b.y.-long hiatus. A digital elevation model (DEM) of this surface visually highlights regional-scale variability in the character of basement topography across the United States cratonic platform. Specifically, it delineates Phanerozoic tectonic domains, each characterized by a distinct structural wavelength (horizontal distance between adjacent highs) and/or structural amplitude (vertical distance between adjacent lows and highs). The largest domain, the Midcontinent domain, includes long-wavelength epeirogenic basins and domes, as well as fault-controlled steps. The pronounced change in land-surface elevation at the Rocky Mountain Front coincides with the western edge of the Midcontinent domain on the basement DEM. In the Rocky Mountain and Colorado Plateau domains, west of the Rocky Mountain Front, structural wavelength is significantly shorter and structural amplitude significantly higher than in the Midcontinent domain. The Bordering Basins domain outlines the southern and eastern edges of the Midcontinent domain. As emphasized by the basement DEM, several kilometers of structural relief occur across the boundary between these two domains, even though this boundary does not stand out on ground-surface topography. A plot of epicenters on the basement DEM supports models associating intraplate seismicity with the Midcontinent domain edge. Notably, certain changes in crustal thickness also coincide with distinct changes in basement depth.
DS201712-2679
2018
Hamburger, M.W.Chen, C., Hersh, G., Fischer, K.M., Andronicos, C.L., Pavlis, G.L., Hamburger, M.W., Marshak, S., Larson, T., Yang, X.Lithospheric discontinuities beneath the U.S. Midcontinent - signatures of Proterozoic terrane accretion and failed rifting.Earth and Planetary Science Letters, Vol. 481, pp. 223-235.United States, Illinois, Indiana, Kentuckygeophysics - seismics Reelfoot Rift

Abstract: Seismic discontinuities between the Moho and the inferred lithosphere-asthenosphere boundary (LAB) are known as mid-lithospheric discontinuities (MLDs) and have been ascribed to a variety of phenomena that are critical to understanding lithospheric growth and evolution. In this study, we used S-to-P converted waves recorded by the USArray Transportable Array and the OIINK (Ozarks-Illinois-Indiana-Kentucky) Flexible Array to investigate lithospheric structure beneath the central U.S. This region, a portion of North America's cratonic platform, provides an opportunity to explore how terrane accretion, cratonization, and subsequent rifting may have influenced lithospheric structure. The 3D common conversion point (CCP) volume produced by stacking back-projected Sp receiver functions reveals a general absence of negative converted phases at the depths of the LAB across much of the central U.S. This observation suggests a gradual velocity decrease between the lithosphere and asthenosphere. Within the lithosphere, the CCP stacks display negative arrivals at depths between 65 km and 125 km. We interpret these as MLDs resulting from the top of a layer of crystallized melts (sill-like igneous intrusions) or otherwise chemically modified lithosphere that is enriched in water and/or hydrous minerals. Chemical modification in this manner would cause a weak layer in the lithosphere that marks the MLDs. The depth and amplitude of negative MLD phases vary significantly both within and between the physiographic provinces of the midcontinent. Double, or overlapping, MLDs can be seen along Precambrian terrane boundaries and appear to result from stacked or imbricated lithospheric blocks. A prominent negative Sp phase can be clearly identified at 80 km depth within the Reelfoot Rift. This arrival aligns with the top of a zone of low shear-wave velocities, which suggests that it marks an unusually shallow seismic LAB for the midcontinent. This boundary would correspond to the top of a region of mechanically and chemically rejuvenated mantle that was likely emplaced during late Precambrian/early Cambrian rifting. These observations suggest that the lithospheric structure beneath the Reelfoot Rift may be an example of a global phenomenon in which MLDs act as weak zones that facilitate the removal of cratonic lithosphere that lies beneath.
DS1989-0934
1989
Hamdani, Y.Mareschal, J.C., Hamdani, Y., Jessup, D.M.Downward continuation of heat flow dataTectonophysics, Vol. 164, No. 2-4, August 1, pp. 129-138GlobalMantle, Crust -heat flow
DS2000-0910
2000
Hamed, J.A.Sobouti, F., Hamed, J.A.Thermo-mechanical modeling of subduction of continental lithosphereGeological Association of Canada (GAC)/Mineralogical Association of Canada (MAC) 2000, 2p. abstract.MantleGeodynamics, tectonics
DS201212-0122
2012
Hameed, A.Chambers, J.E., Wilkinson, P.B., Wardrop, D., Hameed, A., Hill, L., Jeffrey, C., Loke, Mledrum, Kuras, Cave, GunnBedrock detection beneath river terrace deposits using three dimensional electrical resistivity tomography.Geomorphology, Vol. 177-178, pp. 7-25.TechnologyTomography - not specific to diamonds
DS201312-0144
2013
Hameed, A.Chambers, J.E., Wilkinson, P.B., Wrdrop, D., Hameed, A., Hill, I., Jeffrey, C., Loke, M.H., Meldrum, P.I., Kuras, O., Cave, M., Gunn, D.A.Bedrock detection beneath river terrace deposits using three dimensional electrical resistivity tomography.Geomorphology, Vol. 177-178, pp. 17-25.GlobalGeochronology
DS1988-0287
1988
Hamelin, B.Hamelin, B., Allegre, C.J.Lead isotope study of orogenic lherzolite massifsEarth and Planetary Science Letters, Vol. 91, No. 1-2, December pp. 117-131GlobalGeochronology Lherzolite, Mantle
DS1997-0536
1997
Hamelin, B.Innocent, C., Michard, A., Hamelin, B.Strontium isotopic evidence for ion exchange buffering in tropical laterites from the Parana, BrasilChemical Geology, Vol. 136, No. 3/4 Apr. 25, pp. 219-232BrazilGeochemistry, Laterites
DS2003-0539
2003
Hames, W.Hames, W., McHone, J.G., Renne, P., Ruppel, C.The central Atlantic magmatic province: insights from fragments of PangeaAmerican Geophysical Union, Geophysical Monograph, No. 136, 330p.Brazil, Morocco, Guinea, Guyana, MauritaniaMagmatism
DS200412-0770
2003
Hames, W.Hames, W., McHone, J.G., Renne, P., Ruppel, C.The central Atlantic magmatic province: insights from fragments of Pangea.American Geophysical Union, Geophysical Monograph, No. 136, 330p.South America, Brazil, Guyana, Africa, Guinea, MauritaniaMagmatism
DS201610-1861
2016
Hames, W.Freeman, Z.W., Hames, W., Bridges, D.L.The Devonian Avon alkaline province, Missouri: characterization of subcontinental mantle source and evolution from olivine phenocrysts.GSA Annual Meeting, 1/2p. abstractUnited States, MissouriAlnoite, melilitite

Abstract: We present new data on the crystallization age of, and composition of olivine phenocrysts within, an alnöite and olivine melilitite of the Avon Alkalic Igneous Province (AAIP) of Missouri. The AAIP is an ultramafic igneous province consisting of more than 80 known lithologically and texturally diverse intrusions, cropping out in northeastern flank of the St. Francois Mtn. Terrane. 40Ar/39Ar geochronology of biotite phenocrysts constrains emplacement to 386 +/- 1 Ma. Xenocrystic biotite from one sample yields 40Ar/39Ar age spectra characteristic of episodic loss, indicating crystallization at ca. 1.3 Ga followed by partial loss in the ultramafic magma at 386 Ma. Olivines within the alnöite are subhedral, variably serpentinized, and embayed. Olivines within the melilitite are euhedral, but extensively serpentinized. Disequilibrium textures observed in alnöite olivine are consistent with resorption of magmatic olivine as a result of decompression during crystallization. Euhedral olivine within the melilitite appear to have remained in equilibrium with melt, suggesting derivation of alnöite and melilitite from unique magmas. Major and trace elemental abundances of olivine from the alnöite were characterized with electron probe microanalysis. Olivines are Mg-rich (Fo86.9-Fo89.9), and exhibit systematic variation in trace element (e.g., Ni (1627 to 3580 ppm), Cr (97 to 1603 ppm), Co (149 to 259 ppm), Ti (11 to 267 ppm), Al (undetectable to 923 ppm), and P (undetectable to 433 ppm)) abundances with decreasing forsterite content consistent with fractional crystallization. All geothermometers yield a range in temperature, e.g., the Al in olivine (De Hoog et al., 2009) yield temperatures of 1087° to 1313° C at depths of 80 km to 180 km (modern-day midcontinental LAB). Olivine trace element discrimination diagrams indicate AAIP magmas were derived from mantle sources with an alkalic affinity, similar to other continental alkaline rocks and kimberlite. A mantle origin via partial melting of carbonated peridotite mantle is suggested due to the high Mg content, results of geothermometric modeling, and high Ca and Ti abundance within olivine phenocrysts. Melting of the mantle may have ben triggered by "Acadian" tectonic events.
DS1999-0367
1999
Hames, W.E.Klein, A.C., Steltenpohl, M.G., Hames, W.E., AndresenDuctile and brittle extension in the southern LOfoten Archipelago:implications for differences in tectonicsAmerican Journal of Science, Vol. 299, Jan. pp. 69-89.NorwayBaltic basement, structure, Collisional margin
DS2000-0381
2000
Hames, W.E.Hames, W.E., Renne, P.R.New evidence for geologically instantaneous emplacement of earliest Jurassic Central Atlantic magmatic provinceGeology, Vol. 28, No. 9, Sept. pp. 859-62.United StatesDike swarm
DS201212-0447
2012
Hametner, K.Martin, L.H.J., Schmidt, M.W., Mattsson, H.B., Ulmer, P., Hametner, K., Gunther, D.Element partitioning between immiscible carbonatite-kamafugite melts with application to the Italian ultrapotassic suite.Chemical Geology, Vol. 320-321 pp. 96-112.Europe, ItalyCarbonatite
DS1999-0282
1999
Hamgartner, D.Hamgartner, D.Diamond exploration of the Leser Slave Lake, Otauwau area propertyAlberta Geological Survey, MIN 199900018AlbertaExploration - assessment
DS1999-0283
1999
Hamgartner, D.Hamgartner, D.Diamond exploration of the Sawridge PropertyAlberta Geological Survey, MIN 199900019.AlbertaExploration - assessment
DS201702-0201
2017
Hamid Mumin, A.Chakhmouradian, A.R., Rehuir, E.P., Zaitsev, A.N., Coueslan, C., Xu, C., Kynicky, J., Hamid Mumin, A., Yang, P.Apatite in carbonatitic rocks: compositional variation, zoning, element partitioning and petrogeneitic significance.Lithos, in press available, 138p.TechnologyCarbonatite

Abstract: The Late Cretaceous (ca. 100 Ma) diamondiferous Fort à la Corne (FALC) kimberlite field in the Saskatchewan (Sask) craton, Canada, is one of the largest known kimberlite fields on Earth comprising essentially pyroclastic kimberlites. Despite its discovery more than two decades ago, petrological, geochemical and petrogenetic aspects of the kimberlites in this field are largely unknown. We present here the first detailed petrological and geochemical data combined with reconnaissance Nd isotope data on drill-hole samples of five major kimberlite bodies. Petrography of the studied samples reveals that they are loosely packed, clast-supported and variably sorted, and characterised by the presence of juvenile lapilli, crystals of olivine, xenocrystal garnet (peridotitic as well as eclogitic paragenesis) and Mg-ilmenite. Interclast material is made of serpentine, phlogopite, spinel, carbonate, perovskite and rutile. The mineral compositions, whole-rock geochemistry and Nd isotopic composition (Nd: + 0.62 to ? 0.37) are indistinguishable from those known from archetypal hypabyssal kimberlites. Appreciably lower bulk-rock CaO (mostly < 5 wt%) and higher La/Sm ratios (12-15; resembling those of orangeites) are a characteristic feature of these rocks. Their geochemical composition excludes any effects of significant crustal and mantle contamination/assimilation. The fractionation trends displayed suggest a primary kimberlite melt composition indistinguishable from global estimates of primary kimberlite melt, and highlight the dominance of a kimberlite magma component in the pyroclastic variants. The lack of Nb-Ta-Ti anomalies precludes any significant role of subduction-related melts/fluids in the metasomatism of the FALC kimberlite mantle source region. Their incompatible trace elements (e.g., Nb/U) have OIB-type affinities whereas the Nd isotope composition indicates a near-chondritic to slightly depleted Nd isotope composition. The Neoproterozoic (~ 0.6-0.7 Ga) depleted mantle (TDM) Nd model ages coincide with the emplacement age (ca. 673 Ma) of the Amon kimberlite sills (Baffin Island, Rae craton, Canada) and have been related to upwelling protokimberlite melts during the break-up of the Rodinia supercontinent and its separation from Laurentia (North American cratonic shield). REE inversion modelling for the FALC kimberlites as well as for the Jericho (ca. 173 Ma) and Snap Lake (ca. 537 Ma) kimberlites from the neighbouring Slave craton, Canada, indicate all of their source regions to have been extensively depleted (~ 24%) before being subjected to metasomatic enrichment (1.3-2.2%) and subsequent small-degree partial melting. These findings are similar to those previously obtained on Mesozoic kimberlites (Kaapvaal craton, southern Africa) and Mesoproterozoic kimberlites (Dharwar craton, southern India). The striking similarity in the genesis of kimberlites emplaced over broad geological time and across different supercontinents of Laurentia, Gondwanaland and Rodinia, highlights the dominant petrogenetic role of the sub-continental lithosphere. The emplacement of the FALC kimberlites can be explained both by the extensive subduction system in western North America that was established at ca. 150 Ma as well as by far-field effects of the opening of the North Atlantic ocean during the Late Cretaceous.
DS1998-0529
1998
HamiltonGraham, S., Lambert, D.D., Shee, S.R., Smith, HamiltonRe Os and Sm neodymium isotope systematics of alkaline ultramafic rocks, xenoliths and macrocrysts...7th International Kimberlite Conference Abstract, pp. 262-4.AustraliaAlkaline rocks, Yilgarn Craton, Earaheedy Basin area
DS2000-0276
2000
HamiltonErnst, R.E., Buchan, K.L., Hamilton, Okrugin, TomshinIntegrated paleomagnetism and uranium-lead (U-Pb) geochronology of mafic dikes of Eastern Anabar Shield Region: LaurentiaJournal of Geology, Vol. 108, pp. 381-401.Russia, SiberiaMesoproterozoic paleolatitude comparison Laurentia, Geophysics - magnetics
DS2001-0140
2001
HamiltonBuchan, K.L., Ernst, Hamilton, Mertanen, Pesonen, ElmingRodinia: the evidence from integrated paleomagnetism and uranium-lead (U-Pb) geochronologyPrecambrian Research, Vol. 110, pp. 9-32.GlobalGeochronology
DS200912-0341
2009
HamiltonJones, A.G., Evans, Muller, Hamilton, Miensopust, Garcia, Cole, Ngwisanyi, Hutchins, Stoffel Fourie, Jelsma, Aravanis, Petit, Webb, WasborgArea selection for diamonds using magnetotellurics: examples from southern Africa.Lithos, In press - available 35p.Africa, South Africa, BotswanaGeophysics - magnetotellurics
DS200912-0522
2009
HamiltonMuller, M.R., Jones, Evans, Grutter, Hatton, Garcia, Hamilton, Miensopust, Cole, Ngwisanyi, Hutchins, Fourie, Jelsma,Aravanis.Pettit, Webb, WasborgLithospheric structure, evolution and diamond prospectivity of the Rehoboth Terrane and western Kaapvaal Craton, southern Africa: constraints from broadbandLithos, In press - available 57p..Africa, South Africa, BotswanaGeophysics - broadband magnetotellurics
DS201012-0077
2010
HamiltonBuchan, K.L., Ernst, R.E., Bleeker, W., Davis, W.J., Villeneuve, M., Van Breeman, O., Hamilton, SoderlundMap of Proterozoic magmatic events in the Slave Craton, Wopmay Orogen and environs, Canadian Shield.International Dyke Conference Held Feb. 6, India, 1p. AbstractCanada, Northwest TerritoriesMagmatism
DS201112-0312
2011
HamiltonEvans, R.L., Jones, A.G., Garcia, X., Muller, M., Hamilton, Evans, Fourie, Spratt, Webb, Jelsma, HutchinsElectrical lithosphere beneath the Kaapvaal craton, southern Africa.Journal of Geophysical Research, Vol. 116, B4, B04105.Africa, South AfricaGeophysics - seismics
DS1900-0409
1906
Hamilton, C.Hamilton, C.Description of a New Method of Treating Blue Ground for Recovery of Diamonds.Jewellers Circular Keystone, Vol. 53, No. 16, Nov. 21ST. P. 97.Africa, South AfricaMining Engineering, Diamond Recovery
DS1975-0682
1978
Hamilton, D.L.Barton, M., Hamilton, D.L.Water-saturated Melting Relations to 5 Kilobars of Three Leucite Hills Lavas.Contributions to Mineralogy and Petrology, Vol. 66, PP. 41-49.GlobalKimberlite, Leucite Hills, Leucite, Rocky Mountains
DS1975-0683
1978
Hamilton, D.L.Barton, M., Hamilton, D.L.Water saturated melting relations to 5 kilobars of three leucite Hills, lavas.Contributions to Mineralogy and Petrology, Vol. 66, pp.41-9.WyomingLeucite Hills, Magma - Crystallization
DS1975-0938
1979
Hamilton, D.L.Barton, M., Hamilton, D.L.The Melting Relationships of a Madupite from the Leucite Hills, Wyoming, to 30 Kb.Contributions to Mineralogy and Petrology, Vol. 69, No. 2, PP. 133-142.GlobalLeucite, Rocky Mountains
DS1980-0130
1980
Hamilton, D.L.Freestone, I.C., Hamilton, D.L.The role of liquid immiscibility in the genesis of carbonatites - an experimental study.Contributions to Mineralogy and Petrology, Vol. 73, pp. 105-117.GlobalCarbonatite, Petrology - Experimental
DS1981-0077
1981
Hamilton, D.L.Bedson, P., Hamilton, D.L.Kimberlites, Carbonatites and Liquid ImmiscibilityIn: Fifth progress report of research support by N.E.R.C. 1978- 1980, Progress in experimental petrology, GBR, Vol. 5, pp. 29GlobalCarbonatite
DS1986-0336
1986
Hamilton, D.L.Hamilton, D.L., Bedson, P.Carbonatites by liquid immiscibilityGeological Association of Canada (GAC) Annual Meeting, Vol. 11, p. 77. (abstract.)GlobalCarbonatite
DS1987-0158
1987
Hamilton, D.L.Donaldson, C.H., Hamilton, D.L.Compositional convection and layering in a rock meltNature, Vol. 327, No. 6121, June 4, pp. 413-415GlobalPicrite, Alkaline rocks
DS1988-0288
1988
Hamilton, D.L.Hamilton, D.L., Bedson, P.Distribution of trace elements between immiscible silicate and carbonatitemeltsTerra Cognita, Vol. 8, No. 1, Winter 1988 p. 65. Abstract onlyGlobalBlank
DS1988-0358
1988
Hamilton, D.L.Kjarsgaard, B.A., Hamilton, D.L.Liquid immiscibility and the origin of alkali poor carbonatitesMineralogical Magazine, Vol. 52, No. 364, No. 1, March pp. 43-56GlobalBlank
DS1989-0577
1989
Hamilton, D.L.Hamilton, D.L., Bedson, P., Esson, J.The behaviour of trace elements in the evolution of carbonatitesCarbonatites -Genesis and Evolution, Ed. K. Bell Unwin Hyman Publ, pp. 405-427TanzaniaExperimental Petrology, Oldoinyo Lengai
DS1989-0788
1989
Hamilton, D.L.Kjarsgaard, B., Hamilton, D.L., Gittins, J.Carbonatite origin and diversity.. discussion and replyNature, Vol. 338, No. 6216, April 13, pp. 547-548GlobalCarbonatite, Genesis
DS1989-0789
1989
Hamilton, D.L.Kjarsgaard, B.A., Hamilton, D.L.The genesis of carbonatites by immiscibilityCarbonatites -Genesis and Evolution, Ed. K. Bell Unwin Hyman Publ, pp. 388-404GlobalExperimental Petrology, Fractional crystallizatio
DS1989-0790
1989
Hamilton, D.L.Kjarsgaard, B.A., Hamilton, D.L.Melting experiments on shombole nephelinites: silicate/carbonateimmiscibility, phase relations and the liquid line of descentGeological Association of Canada (GAC) Annual Meeting Program Abstracts, Vol. 14, p. A50. (abstract.)KenyaGregory Rift
DS1990-0244
1990
Hamilton, D.L.Brooker, R.A., Hamilton, D.L.Three liquid immisicibility and the origin of carbonatitesNature, Vol. 346, No. 6283, ugust 2, pp. 459-461GlobalCarbonatite, Chemistry
DS1990-0245
1990
Hamilton, D.L.Brooker, R.A., Hamilton, D.L.Three liquid immiscibility and the origin of carbonatitesTerra, Abstracts of Experimental mineralogy, petrology and, Vol. 2, December abstracts p. 67GlobalOrigin, Carbonatite
DS1993-0622
1993
Hamilton, D.L.Hamilton, D.L., Kjarsgaard, B.A.The immiscibility of silicate and carbonate liquidsSouth African Journal of Geology, Vol. 96, No. 3, Sept. pp. 139-142.TanzaniaCarbonatite, Oldoinyo Lengai
DS1993-1354
1993
Hamilton, D.L.Ryabchikov, I.D., Hamilton, D.L.Interaction of carbonate phosphate melts with mantle peridotites at 20 - 35kbar.South African Journal of Geology, Vol. 96, No. 3, Sept. pp. 143-148.GlobalSpinel lherzolite, Petrology -experimental
DS1994-0921
1994
Hamilton, D.L.Kjarsgaard, B.A., Hamilton, D.L., Peterson, T.D.Peralkaline nephelinite carbonatite liquid immiscibility: comparison of phase compositions..lavasCarbonatite volcanism, Ed. Bell, K., Keller, J., pp. 163-190.TanzaniaPetrology - Carbonatite volcanism., Deposit -Oldoinyo Lengai
DS1994-1507
1994
Hamilton, D.L.Ryabchikov, I.D., Hamilton, D.L.Near solidus liquids in carbonatized mantle peridotites in the presence of apatite and uraninite.Geochemistry International, Vol. 31, No. 3, pp. 77-85.MantlePeridotites
DS1994-0703
1994
Hamilton, E.Hamilton, E.Logistics report on high sensitivity magnetics airborne geophysical project le Tac.Quebec Department of Mines, GM 52942, 56p.QuebecExploration - assessment, Diabior Inc.
DS1989-0578
1989
Hamilton, J.Hamilton, J.Earth science in Canada from a user's viewpointGeoscience Canada, Vol. 16, No. 4, December pp. 213-220CanadaOverview (Geological Association of Canada (GAC) Pres. address), Exploration philosphy
DS201807-1516
2018
Hamilton, J.L.Mervine, E.M., Wilson, S.A., Power, I.M., Dipple, G.M., Turvey, C.C., Hamilton, J.L., Vanderzee, S., Raudsepp, M., Southam, C., Matter, J.M., Kelemen, P.B., Stiefenhofer, J., Miya, Z., Southam, G.Potential for offsetting diamond mine carbon emissions through mineral carbonation of processed kimberlite: an assessment of De Beers mine sites in South Africa and Canada.Mineralogy and Petrology, 10.1007/ s00710-018- 0589-4, 14p.Africa, South Africa, Canada, Northwest Territories, Ontariodeposit - Venetia, Voorspoed, Gahcho Kue, Victor, Snap Lake

Abstract: De Beers kimberlite mine operations in South Africa (Venetia and Voorspoed) and Canada (Gahcho Kué, Victor, and Snap Lake) have the potential to sequester carbon dioxide (CO2) through weathering of kimberlite mine tailings, which can store carbon in secondary carbonate minerals (mineral carbonation). Carbonation of ca. 4.7 to 24.0 wt% (average?=?13.8 wt%) of annual processed kimberlite production could offset 100% of each mine site’s carbon dioxide equivalent (CO2e) emissions. Minerals of particular interest for reactivity with atmospheric or waste CO2 from energy production include serpentine minerals, olivine (forsterite), brucite, and smectite. The most abundant minerals, such as serpentine polymorphs, provide the bulk of the carbonation potential. However, the detection of minor amounts of highly reactive brucite in tailings from Victor, as well as the likely presence of brucite at Venetia, Gahcho Kué, and Snap Lake, is also important for the mineral carbonation potential of the mine sites.
DS1900-0410
1906
Hamilton, J.S.Hamilton, J.S.Mining Diamonds in South Africa 1906World's Work, Vol. 8, PP. 234-235.Africa, South AfricaHistory
DS1910-0053
1910
Hamilton, J.S.Hamilton, J.S.Mining Diamonds in South Africa 1910World's Work, Vol. 12, AUGUST, PP. 7904-7907.South Africa, Griqualand WestHistory
DS1981-0200
1981
Hamilton, J.S.Hamilton, J.S.Late Cenozoic Alkalic Volcanics of the Level Mountain Range northwestern British Columbia: Geology, Petrology and Paleomagnetism.Ph.d. Thesis, University Alberta, Edmonton., Canada, British ColumbiaRegional Studies
DS2002-0640
2002
Hamilton, K.Hamilton, K.The role of Australian stock exchange limited in enhancing reporting standardsAustralian Institute of Mining and Metallurgy, No. 3/2002, pp.57-62.AustraliaMineral reserves - definitions, disclosure framework, JORC code
DS1990-1038
1990
Hamilton, L.Mickus, K., Keller, G.R., Hamilton, L., Jurick, D., Gurrola, H.Geophysical transects across the southern midcontinent region of the UnitedStatesGeological Society of America (GSA) Annual Meeting, Abstracts, Vol. 22, No. 7, p. A191GlobalGeochronology, Geophysics
DS200712-0042
2007
Hamilton, M.Ayer, J., Hamilton, M., Jetchum, J., Stott, G., Wilson, A., Wyman, D.The age and provenance of Archean diamond bearing rocks in the Wawa area, northeastern Ontario.Diatreme breccias.Geological Association of Canada, Gac-Mac Yellowknife 2007, May 23-25, Volume 32, 1 pg. abstract p.4.Canada, Ontario, WawaDiatreme breccias
DS201905-1077
2018
Hamilton, M.Soderlund, U., Bleeker, W., Demirer, K., Srivastava, R.K., Hamilton, M., Nilsson, M., Personen, L.J., Samal, A.K., Jayananda, M., Ernst, R.E., Srinivas, M.Emplacement ages of Paleoproterozoic mafic dyke swarms in eastern Dharwar craton, India: implications for paleoreconstructions and support for a ~30 degree change in dyke trends from south to north.Precambrian Research, doi.org/10.1016/ j.precamres.2018.12.017Indiacraton

Abstract: Large igneous provinces (LIPs) and especially their dyke swarms are pivotal to reconstruction of ancient supercontinents. The Dharwar craton of southern Peninsular India represents a substantial portion of Archean crust and has been considered to be a principal constituent of Superia, Sclavia, Nuna/Columbia and Rodinia supercontinents. The craton is intruded by numerous regional-scale mafic dyke swarms of which only a few have robustly constrained emplacement ages. Through this study, the LIP record of the Dharwar craton has been improved by U-Pb geochronology of 18 dykes, which together comprise seven generations of Paleoproterozoic dyke swarms with emplacement ages within the 2.37-1.79 Ga age interval. From oldest to youngest, the new ages (integrated with U-Pb ages previously reported for the Hampi swarm) define the following eight swarms with their currently recommended names: NE-SW to ESE-WNW trending ca. 2.37 Ga Bangalore-Karimnagar swarm. N-S to NNE-SSW trending ca. 2.25 Ga Ippaguda-Dhiburahalli swarm. N-S to NNW-SSE trending ca. 2.22 Ga Kandlamadugu swarm. NW-SE to WNW-ESE trending ca. 2.21 Ga Anantapur-Kunigal swarm. NW-SE to WNW-ESE trending ca. 2.18 Ga Mahbubnagar-Dandeli swarm. N-S, NW-SE, and ENE-WSW trending ca. 2.08 Ga Devarabanda swarm. E-W trending 1.88-1.89 Ga Hampi swarm. NW-SE ca. 1.79 Ga Pebbair swarm. Comparison of the arcuate trends of some swarms along with an apparent oroclinal bend of ancient geological features, such as regional Dharwar greenstone belts and the late Archean (ca. 2.5 Ga) Closepet Granite batholith, have led to the hypothesis that the northern Dharwar block has rotated relative to the southern block. By restoring a 30° counter clockwise rotation of the northern Dharwar block relative to the southern block, we show that pre-2.08 Ga arcuate and fanning dyke swarms consistently become approximately linear. Two possible tectonic models for this apparent bending, and concomitant dyke rotations, are discussed. Regardless of which deformation mechanisms applies, these findings reinforce previous suggestions that the radial patterns of the giant ca. 2.37 Ga Bangalore-Karimnagar dyke swarm, and probably also the ca. 2.21 Ga Anantapur-Kunigal swarm, may not be primary features.
DS201906-1322
2019
Hamilton, M.McCausland, P., Higgins, M., LeCheminant, A., Jourdan, F., Hamilton, M., Murphy, J.B.Laurentia during the mid-Edicacaran: paleomagnetism and 580 Ma age of the Saint Honore alkali intrusion and related dykes, Quebec. GAC/MAC annual Meeting, 1p. Abstract p. 141.Canada, Quebecdeposit - Saint Honore

Abstract: We sampled the mid-Ediacaran Saint-Honoré alkali intrusion and related dykes in the Saguenay City region of Québec for paleomagnetic and U-Pb, 40Ar/39Ar geochonologic study. 40Ar/39Ar geochronology of phlogopite separates from carbonatite of the central intrusion return plateau ages with a weighted mean of 578.3 ± 3.5 Ma. Baddeleyite from a phoscorite dyke provides a concordant age of 580.25 ± 0.87 Ma for the crystallization of the dykes associated with the St-Honoré intrusive complex. Paleomagnetic results from the intrusion itself and related carbonatite and lamprophyre dykes exhibit some streaking between higher to moderate inclination directions, even at the site level, after screening to remove a steep, present-day viscous remanence. The predominant St-Honoré mean direction (13 sites), which is primary (baked contact test on the host Lac St-Jean anorthosite), is D = 119, I = 72.3°; ?95 = 9.5°, retained at higher coercivity and to high unblocking temperatures by titanomagnetite. Assuming a geocentric axial dipole, this result places the St. Honoré locality at 57° S at ~ 580 Ma, implying that Laurentia straddled mid-paleolatitudes at that time. Notably, the paleopole location at 27.2° N, 320.7 E (dp = 15°, dm = 17°) is consistent with similar mid-Ediacaran age paleopoles which place Laurentia at mid- to high paleolatitudes. The Saint-Honoré result implies that Laurentia had moved from low latitude in the early Ediacaran to higher southern paleolatitudes by 580-570 Ma, and then back to low paleolatitudes by as early as 564 Ma. Viewed as apparent polar wander (APW), this motion traces an 'Ediacaran loop' that can also be seen in similar-aged paleomagnetic results from at least two other paleocontinents. The similar APW loops suggest a role for true polar wander in Ediacaran geodynamics, and perhaps help to define a longitudinally-constrained global Ediacaran paleogeography.
DS1994-1411
1994
Hamilton, M.A.Prevec, S.A., Stevenson, R.K., Emslie, R.F., Hamilton, M.A.Evolution of the mid-Proterozoic Flowers River peralkaline granite, Labrador: geochemical and samarium-neodymium (Sm-Nd) isotopic evidence.Geological Association of Canada (GAC) Abstract Volume, Vol. 19, p. posterLabradorAlkaline rocks, Flowers River
DS1997-0315
1997
Hamilton, M.A.Emslie, R.F., Hamilton, M.A., Gower, C.F.The Michael gabbro and other mesoproterozoic lithospheric probes in southern and central labrador.Canadian Journal of Earth Sciences, Vol. 34, pp. 1566-80.Quebec, Labrador, UngavaLithosphere, Tectonics
DS1998-0566
1998
Hamilton, M.A.Hamilton, M.A., Pearson, D.G., Stern R.A., Boyd, F.R.Constraints on MARID petrogenesis: SHRIMP II uranium-lead (U-Pb) zircon evidence for pre-eruption Metasomatism..7th International Kimberlite Conference Abstract, pp. 296-8.South AfricaGeochronology, Deposit - KampfersdaM.
DS1999-0200
1999
Hamilton, M.A.Evans, R.J., Ashwal, L.D., Hamilton, M.A.Mafic, ultramafic and anorthositic rocks of the Tete Complex: petrology, age and significance.South African Journal of Geology, Vol. 102, No. 2, June, pp. 153-66.GlobalPetrology
DS2000-0382
2000
Hamilton, M.A.Hamilton, M.A., Roddick, J.C., Delaney, G.New uranium-lead (U-Pb) geochronological constraints on the age of basement and cover in the eastern Wollaston Domain...Geological Association of Canada (GAC)/Mineralogical Association of Canada (MAC) 2000 Conference, 4p. abstract.SaskatchewanGeochronology, Craton - Rae and Hearne
DS2001-0109
2001
Hamilton, M.A.Bickford, M.E., Hamilton, M.A., Wortman, G., Hill, B.M.Archean rocks in the southern Rottenstone Domain: significance for the evolution of Trans Hudson OrogenCanadian Journal of Earth Sciences, Vol. 38, No. 7, July pp. 1017-25.Saskatchewan, ManitobaGeochronology, Trans Hudson orogeny
DS2001-0440
2001
Hamilton, M.A.Hamilton, M.A., Goutier, J., Matthews, W.uranium-lead (U-Pb) baddeleyite age for the Paleoproterozoic Lac Esprit dyke swarm, James Bay region, Quebec.Geological Survey of Canada (GSC) Current Research, No. 2001-F5, 17p.Quebec, James Bay LowlandsGeochronology, Yasinski Lake, dike swarm
DS2002-0346
2002
Hamilton, M.A.Dahl, P.S., Hamilton, M.A.Ion microprobe evidence for early Proterozoic thermotectonics reworking of the NW Archean Wyoming...Gac/mac Annual Meeting, Saskatoon, Abstract Volume, P.25., p.25.MontanaGreat Falls Tectonic Zone, Tectonics
DS2002-0347
2002
Hamilton, M.A.Dahl, P.S., Hamilton, M.A.Ion microprobe evidence for early Proterozoic thermotectonics reworking of the NW Archean Wyoming...Gac/mac Annual Meeting, Saskatoon, Abstract Volume, P.25., p.25.MontanaGreat Falls Tectonic Zone, Tectonics
DS2002-0501
2002
Hamilton, M.A.Garde, A.A., Hamilton, M.A., Chadwick, B., Grocott, J., McCaffrey, K.J.W.The Ketilidian orogen of South Greenland: geochronology, tectonics, magmatism andCanadian Journal of Earth Science, Vol.39,5, May, pp.765-93.GreenlandTectonics
DS2002-0650
2002
Hamilton, M.A.Hanmer, S., Hamilton, M.A., Crowley, J.L.Geochronological constraints on Paleoarchean thrust nappe and Neoarchean accretionary tectonics in southern West Greenland.Tectonophysics, Vol. 350,No.3, pp. 255-71.GreenlandGeochronology - not specific to diamonds
DS2003-0540
2003
Hamilton, M.A.Hamilton, M.A., Sobolev, N.V., Stern, R.A., Pearson, D.G.SHRIMP U Pb dating of a perovskite inclusion in diamond: evidence for a syneruption8ikc, Www.venuewest.com/8ikc/program.htm, Session 3, POSTER abstractRussia, Siberia, YakutiaDiamonds - inclusions, geochronology, Deposit - Sytykanskaya
DS200512-0201
2004
Hamilton, M.A.Dahl, P.S., Hamilton, M.A., Wooden, J.L., Tracy, R.J., Loehn, C.W., Jones, C.L., Foland, K.A.Do 2450-2480 mineral ages from Wyoming cratonic margins (USA) indicate incipient breakup of supercontinet Kenorland?Geological Society of America Annual Meeting ABSTRACTS, Nov. 7-10, Paper 142-8, Vol. 36, 5, p. 340.United States, WyomingGeochronology
DS200512-0245
2005
Hamilton, M.A.Dostal, J., Keppie, J.D., Hamilton, M.A., Araab, E.M., Lefort, J.P., Murphy, J.B.Crustal xenoliths in Triassic lamprophyre dykes in western Morocco: tectonic implications for the Rheic Ocean suture.Geological Magazine, Vol. 142, 2, pp. 159-172.Africa, MoroccoLamprophyre
DS200612-1457
2005
Hamilton, M.A.Vaillancourt, C., Ayer, J.A., Hamilton, M.A.Project 03-002. Synthesis of Archean geology and diamond bearing rocks in the Michipicoten Greenstone Belt: results from microdiamond extraction and geochronology.Ontario Geological Survey Summary of Fieldwork 2005, O.F. 6172, pp. 8-1-13.Canada, Ontario, WawaGeochronology, geochemsirty
DS200712-0120
2007
Hamilton, M.A.Buchan, K.L., Goutier, J., Hamilton, M.A., Ernst, R.E., Matthews, W.A.Paleomagnetism, U Pb geochronology and geochemistry of Lac Esprit and other dyke swarms, James Bay area, Quebec: implications for Paleoproterozoic deformationCanadian Journal of Earth Sciences, Vol. 44, 5, pp. 643-664.Canada, QuebecDyke swarms
DS200712-0212
2007
Hamilton, M.A.Dahl, P.S., Hamilton, M.A., Wooden, J.L., Foland, K.A., Frei, R., McCombc, J.A., Holm, D.K.2480 Ma mafic magmatism in the northern Black Hills, South Dakota: a new link connecting the Wyoming and Superior Cratons.Canadian Journal of Earth Sciences, Vol. 43, 10, pp. 1579-1600.United States, Wyoming, Canada, AlbertaMagmatism
DS200812-0443
2008
Hamilton, M.A.Halls, H.C., Davis, D.W., Stott, G.M., Ernst, R.E., Hamilton, M.A.The Paleoproterozoic Marathon large igneous province: new evidence for a 2.1 Ga long lived mantle plume event along the southern margin of the N.A. Superior ProvincePrecambrian Research, Vol. 162, 3-4, pp. 327-353.Canada, OntarioMantle plume
DS201012-0185
2010
Hamilton, M.A.Ernst, R.E., Bleeker, W., Soderlund, U., Hamilton, M.A., Sylvester, P.J., Chamberlain, K.R.Using the global dolerite dyke swarm record to reconstruct supercontinents back to 2.7 Ga.International Dyke Conference Held Feb. 6, India, 1p. AbstractGlobalPangea
DS201012-0262
2010
Hamilton, M.A.Halls, H.C., Lovette, A., Soderlund, U., Hamilton, M.A.Paleomagnetism and U Pb geochronology from the western end of the Grenville dyke swarm and the question of true polar wander during the Ediacaran.International Dyke Conference Held Feb. 6, India, 1p. AbstractUnited States, CanadaAlkaline rocks, complexes
DS201312-0249
2013
Hamilton, M.A.Ernst, R.E., Pereira, E., Hamilton, M.A., Pisarevsky, S.A., Rodriques, J., Tasinari, C.C.G., Teixeira, W., Van-Dunem, V.Mesoproterozoic intraplate magmatic 'barcode' record of the Angola portion of the Congo craton: newly dated magmatic events at 1505 and 1110 Ma and implications for Nuna ( Columbia) supercontinent reconstructions.Precambrian Research, Vol. 230, pp. 103-118.Africa, AngolaMagmatism
DS201603-0383
2016
Hamilton, M.A.Hamilton, M.A., Buchan, K.L.A 2169 Ma U-Pb baddeleyite age for the Otish gabbro, Quebec: implications for correlation of Proterozoic magmatic events and sedimentary seuences in the eastern Superior province.Canadian Journal of Earth Sciences, Vol. 53, 2, pp. 119-128.Canada, QuebecGeochronology
DS201607-1295
2016
Hamilton, M.A.Ernst, R.E., Hamilton, M.A., Soderlund, U., Hanes, J.A., Gladkochub, D.P., Okrugin, A.V., Kolotilina, T., Mekhonoshin, A.S., Bleeker, W., LeCheminant, A.N., Buchan, K.L., Chamberlain, K.R., Didenko, A.N.Long lived connection between southern Siberia and northern Laurentia in the Proterozoic.Nature Geoscience, Vol. 9, 6, pp. 464-469.Canada, RussiaProterozoic

Abstract: Precambrian supercontinents Nuna-Columbia (1.7 to 1.3 billion years ago) and Rodinia (1.1 to 0.7 billion years ago) have been proposed. However, the arrangements of crustal blocks within these supercontinents are poorly known. Huge, dominantly basaltic magmatic outpourings and intrusions, covering up to millions of square kilometres, termed Large Igneous Provinces, typically accompany (super) continent breakup, or attempted breakup and offer an important tool for reconstructing supercontinents. Here we focus on the Large Igneous Province record for Siberia and Laurentia, whose relative position in Nuna-Columbia and Rodinia reconstructions is highly controversial. We present precise geochronology—nine U -Pb and six Ar -Ar ages—on dolerite dykes and sills, along with existing dates from the literature, that constrain the timing of emplacement of Large Igneous Province magmatism in southern Siberia and northern Laurentia between 1,900 and 720 million years ago. We identify four robust age matches between the continents 1,870, 1,750, 1,350 and 720 million years ago, as well as several additional approximate age correlations that indicate southern Siberia and northern Laurentia were probably near neighbours for this 1.2-billion-year interval. Our reconstructions provide a framework for evaluating the shared geological, tectonic and metallogenic histories of these continental blocks.
DS201804-0748
2018
Hamilton, M.A.Teixeira, W., Hamilton, M.A., Girardi, A.V., Faleiros, F.M.U Pb baddeleyite ages of key dyke swarms in the Amazonian craton ( Carajas/Rio Maria and Rio Apa areas): tectonic implications for events at 1880, 1110 Ma, 535 Ma and 200 Ma.Precambrian Research, in press available 19p.South Americacraton - Amazonian

Abstract: U-Pb baddeleyite ages for key mafic dykes of the Amazonian Craton reveal four significant intraplate episodes that allow connections with global igneous activity through time and supercontinent cycles. The oldest dykes (Carajás-Rio Maria region) are diabases with ages of 1880.2 ± 1.5 Ma and 1884.6 ± 1.6 Ma, respectively, corresponding with the Tucumã swarm which crops out to the west and is age-equivalent. The magmatic activity has a genetic link with the ca. 1.88 Ga Uatumã Silicic Large Igneous Province (SLIP), characterized by felsic plutonic-volcanic rocks. There is an age correlation with LIP events (ca. 1880 Ma) in the Superior, Slave, Indian and other cratons. This magmatism could be derived from significant perturbations of the upper mantle during the partial assembly of Columbia. Gabbronorite of the Rio Perdido Suite (Rio Apa Terrane) crystallized at 1110.7 ± 1.4 Ma, and is identical to that of the Rincón del Tigre-Huanchaca LIP event of the Amazonian Craton. This event was synchronous with the initiation of Keweenawan magmatism of central Laurentia (Midcontinent Rift) and also with coeval units in the Kalahari, Congo and India cratons. The two youngest U-Pb dates (535 and 200 Ma) occur in the Carajás region. Diabase of the Paraupebas swarm yields an age of 535.1 ± 1.1 Ma, which may be correlative with the giant Piranhas swarm located ca. 900 km apart to the west. The Paraupebas swarm is correlative with post-collisional plutonism within the Araguaia marginal belt. Therefore, the Cambrian dykes may reflect reactivation of cooled lithosphere, due to crustal extension/transtension active along the craton’s margin during assembly of West Gondwana. This magmatism is also contemporaneous with the 539-530 Ma Wichita LIP of southern Laurentia. The youngest studied Carajás region dyke was emplaced at ca. 200 Ma, corresponding with 40Ar/39Ar ages for the Periquito dykes west of Carajás and with most K-Ar ages of the giant Cassiporé swarm, located north of the study area. The newly dated ca. 200 Ma dyke fits well into the known, brief span of ages for the CAMP Large Igneous Province event, around the present central and northern Atlantic Ocean.
DS200612-0524
2006
Hamilton, M.P.Hamilton, M.P., Jones, A.G., Evans, R.L., Evans, S., Fourie, C.J.S., Garcia, X., Mountford, A., Spratt, J.E., SAMTEX MTElectrical anisotropy of South African lithosphere compared with seismic anisotropy from shear wave splitting analyses.Physics of the Earth and Planetary Interiors, In press, availableAfrica, South AfricaGeophysics - magnetotellurics
DS200712-0404
2006
Hamilton, M.P.Hamilton, M.P., Jones, A.G., Evans, R.L., Evans, S., Fourie, C.J.S., Mountford, SprattElectrical anisotropy of South African lithosphere compared with seismic from shear wave splitting analyses.Physics of the Earth and Planetary Interiors, Vol. 158, 2-4, Oct. 16, pp. 226-239.Africa, South AfricaGeophysics - seismics
DS1990-0642
1990
Hamilton, R.Hamilton, R., Rock, N.M.S.Geochemistry, mineralogy and petrology of a new find of lamprophyres from Bulletinjah Pool, Nabberu Basin, Yilgarn Craton, Western AustraliaLithos, Vol. 24, No. 4, August pp. 275-290AustraliaLamprophyres, Bulletinjah Pool
DS1990-0643
1990
Hamilton, R.Hamilton, R., Rock, N.M.S.Geochemistry, mineralogy and petrology of a new find of ultramafic lamprophyres from Bulletinjah Pool, Nabberu Basin, Yilgarn Craton, WesternAustraliaLithos, Vol. 24, No. 4, August pp. 275-290AustraliaLamprophyres, Geochemistry
DS1991-0504
1991
Hamilton, R.Foster, J.G., Hamilton, R., Rock, N.M.S.The mineralogy, petrology and geochemistry of ultramafic lamprophyres Of the Yilgarn craton, western AustraliaProceedings of Fifth International Kimberlite Conference held Araxa June 1991, Servico Geologico do Brasil (CPRM) Special, pp. 112-115AustraliaGeochronology, Mineralogy -cognate
DS1996-0559
1996
Hamilton, R.Graham, S., Lambert, D.D., Shee, S.R., Hamilton, R., FosterAlkaline ultramafic rocks as probes of lithospheric mantle enrichment events in the eastern Yilgarn craton.Australia Nat. University of Diamond Workshop July 29, 30. abstract, 1p.AustraliaCraton, Alkaline rocks, geochronology
DS1996-0587
1996
Hamilton, R.Hamilton, R.Review of diamond exploration in Australia - its demands and successesAustralia Nat. University of Diamond Workshop July 29, 30., 6p.AustraliaDiamond Exploration, Overview
DS1997-0436
1997
Hamilton, R.Graham, S., Lambert, D.D., Shee, S.R., Hamilton, R.ReOs and SmNd evidence for Archean lithosphere mantle modification byorogenesis, Norseman, Western AustraliaGeological Society of Australia Abstracts, No. 44, p. 35. 1p.Australia, Western AustraliaGeochronology, picroilmentites, melnoite, Diamond exploration
DS1998-1450
1998
Hamilton, R.Taylor, W.R., Kamperman, M., Hamilton, R.New thermometer and oxygen fugacity sensor calibrations for ilmenite -chromian spinel bearing peridoite assemb7th International Kimberlite Conference Abstract, p. 891.GlobalGeothermometry
DS1980-0357
1980
Hamilton, R.M.Zoback, M.D., Hamilton, R.M., Crone, H.J., et al.Recurrent Intraplate Tectonism in the New Madrid Seismic ZonScience., Vol. 209, PP. 971-976.GlobalMid-continent
DS1982-0245
1982
Hamilton, R.M.Hamilton, R.M., Zoback, M.D.Tectonic Features of the New Madrid Seismic Zone from Seismic Reflection Profiles.United States Geological Survey (USGS) PROF. PAPER., No. 1236, PP. 55-82.GlobalMid Continent
DS1985-0131
1985
Hamilton, R.M.Crone, A.J., Mckeown, F.A., Harding, S.T., Hamilton, R.M., Russ.Structure of the New Madrid Seismic Source Zone in Southeastern Missouri and Northeastern Arkansaw.Geology, Vol. 13, No. 8, PP. 547-550.United States, Gulf Coast, ArkansasGeophysics
DS1987-0272
1987
Hamilton, R.M.Hamilton, R.M., Agena, W.F., McKeown, F.A.Deep structure of the new Madrid Seismic zone interpreted from seismic reflection profilesEos, Vol. 68, No.44, November 3, p. 1355. abstract onlyArkansas, MissouriGeophysics
DS1989-0990
1989
Hamilton, R.M.McKeown, F.A., Hamilton, R.M.Origin of the Blytheville and Pascola arches in the Reelfoot Rift and their relationship to the New Madrid seismic zoneGeological Society of America (GSA) Annual Meeting Abstracts, Vol. 21, No. 6, p. A148. AbstractMidcontinentTectonics, Reelfoot Rift
DS1990-0644
1990
Hamilton, R.M.Hamilton, R.M., Mooney, W.D.Seismic wave attenuation associated with crustal faults in the New Madrid seismic zoneScience, Vol. 248, No. 4953, April 20, pp. 351-354Arkansas, Missouri, Kentucky, Tennessee, MidcontinentGeophysics -seismics, New Madrid Zone
DS1990-1015
1990
Hamilton, R.M.McKeown, F.A., Hamilton, R.M., Diehl, S.F., Glick, E.E.Diapiric origin of the Blytheville and Pascola arches in the Reelfoot @east-central United States: relation to New Madrid seismicityGeology, Vol. 18, No. 11, November pp. 1158-1162Arkansas, Tennessee, KentuckyReelfoot Rift, Midcontinent
DS2003-0541
2003
Hamilton, S.Hamilton, S.New technologies and new frontiersQuebec Exploration Conference, Nov. 25-27, 1p. abstractOntarioGeophysics - forest rings, mineral chemistry
DS200412-0771
2003
Hamilton, S.Hamilton, S.New technologies and new frontiers.Quebec Exploration Conference, Nov. 25-27, 1p. abstractCanada, OntarioGeophysics - forest rings, mineral chemistry
DS200712-0924
2007
Hamilton, S.Sader, J.A., Leybourne, M.I., McClenaghan, M.B., Hamilton, S.Low temperature serpentinization processes and kimberlite groundwater signature Kirkland Lake and Lake Timiskaming kimberlite fields: implications diamond exploration.Geochemistry: Exploration, Environment, Analysis, Vol. 7, 1, pp. 3-21.Canada, Ontario, Kirkland Lake, TimiskamingGeochemistry - diamond exploration
DS200812-0454
2008
Hamilton, S.Hattori, K., Hamilton, S.Geochemistry of peat over kimberlites in the Attawapiskat area, James Bay Lowlands, northern Ontario.Applied Geochemistry, Vol. 23, 12, pp. 3767-3782.Canada, Ontario, Attawapiskat, James Bay LowlandsDeposit - Victor
DS1996-0588
1996
Hamilton, S.D.Hamilton, S.D.High resolution dat a presents new possibilities... GISEarth Observation Magazine, November p. 37-38.GlobalRemote sensing -GIS
DS1996-0589
1996
Hamilton, S.D.Hamilton, S.D.High resolution dat a presents new possibilities... for GISEarth Observation Magazine, November pp. 37-38GlobalRemote sensing, GIS
DS2002-0641
2002
Hamilton, S.M.Hamilton, S.M., Cameron, S.C.M., McClenaghan, M.B., Hall, G.E.M.Thick overburden geochemical methods: studies over volcanogenic massive sulphideOntario Geological Survey Open File, Summary of Field Work, No. 6100, pp. 27-1-17.Ontario, TimminsGeochemistry
DS2003-0194
2003
Hamilton, S.M.Burt, A.K., Hamilton, S.M.Comparison of selective leach signatures over kimberlites, carbonatites, false anomaliesOntario Geological Survey Open File, No. 6120, pp. 42 1-10.OntarioGeochemistry - kimberlites
DS2003-1203
2003
Hamilton, S.M.Sader, J.A., Leybourne, M.I., McClenaghan, M.B., Hamilton, S.M.Geochemistry of groundwater from Jurassic kimberlites in the Kirkland Lake and LakeGeological Survey of Canada Open File, No. 4515, 1 CD 26p. $ 26.00Ontario, Kirkland LakeGeochemistry
DS2003-1204
2003
Hamilton, S.M.Sader, J.A., Leybourne, M.I., McClenaghan, M.B., Hamilton, S.M., RobertsonGroundwater interaction with kimberlites - a geochemical investigation in northeasternExplore ( AEG Newsletter), No. 118, January pp. 1-4.Ontario, Kirkland LakeGeochemistry, Analytical methods and results
DS2003-1205
2003
Hamilton, S.M.Sader, J.A., Leybourne, M.I., McClenaghan, M.B., Hamilton, S.M., RobertsonField procedures and results of groundwater sampling in kimberlite from drillholes in theGeological Survey of Canada Current Research, 9p.Ontario, Kirkland LakeSampling - geomorphology
DS2003-1206
2003
Hamilton, S.M.Sader, J.A., Leybourne, M.L., McClenaghan, M.B., Hamilton, S.M., RobertsonKimberlite exploration using aqueous geochemistry - a new exploration methodGeological Association of Canada Annual Meeting, Abstract onlyGlobalTechniues - geochemistry
DS200412-0250
2003
Hamilton, S.M.Burt, A.K., Hamilton, S.M.Comparison of selective leach signatures over kimberlites, carbonatites, false anomalies and blind targets.Ontario Geological Survey Open File, No. 6120, pp. 42 1-10.Canada, OntarioGeochemistry - kimberlites
DS200412-1717
2003
Hamilton, S.M.Sader, J.A., Leybourne, M.I., McClenaghan, M.B., Hamilton, S.M.Geochemistry of groundwater from Jurassic kimberlites in the Kirkland Lake and Lake Timiskaming kimberlite fields northeastern OGeological Survey of Canada Open File, No. 4515, 1 CD 26p. $ 26.00Canada, Ontario, Kirkland LakeGeochemistry
DS200412-1718
2003
Hamilton, S.M.Sader, J.A., Leybourne, M.I., McClenaghan, M.B., Hamilton, S.M., Robertson, K.Field procedures and results of groundwater sampling in kimberlite from drillholes in the Kirkland Lake and Lake Temiskaming areGeological Survey of Canada Current Research, 9p.Canada, Ontario, Kirkland LakeSampling - geomorphology
DS200412-1719
2003
Hamilton, S.M.Sader, J.A., Leybourne, M.L., McClenaghan, M.B., Hamilton, S.M., Robertson, K.Kimberlite exploration using aqueous geochemistry - a new exploration method.Geological Association of Canada Annual Meeting, Abstract onlyTechnologyTechniues - geochemistry
DS200512-0126
2004
Hamilton, S.M.Burt, A.K., Hamilton, S.M.A comparison of selective leach signatures over kimberlites and other targets. B30,A4,A1.AM47,95-2,MR6, Seed, OPAP, Peddie carbonatites Firstbrook, Borden, Firesand,Ontario Geological Survey Open File, No. 6142, 179p. $ 16.Canada, Ontario, Kirkland Lake, New Liskeard, WawaGeochemistry
DS200512-0924
2004
Hamilton, S.M.Sader, J.A., Leybourne, M.I., McClenaghan, B., Sherwood Lollar, B., Hamilton, S.M.Low T serpentinization and the production of hydrogen and methane gas in kimberlites in northeastern Ontario, Canada.Geological Society of America South Central Meeting ABSTRACTS, Vol. 36, 1, p. 28.Canada, Ontario, Kirkland Lake, Lake TemiskamingA4, B30, C14, groundwater interaction
DS200612-0888
2006
Hamilton, S.M.McClenaghan, M.B., Hamilton, S.M., Hall, G.E.M., Burt, A.K., Kjarsgaard, B.A.Selective leach geochemistry of soils overlying the 95-2, B30 and A4 kimberlites, northeast Ontario.Geological Survey of Canada Open File, OF 5069, 28p. $ 9.00Canada, OntarioGeochemistry
DS200712-0405
2007
Hamilton, S.M.Hamilton, S.M.Major advances in soil geochemical exploration methods for areas of thick glacial drift cover.Proceedings of Exploration 07 edited by B. Milkereit, pp. 263-280.TechnologyGeochemistry - geomorphology review
DS200812-0993
2007
Hamilton, S.M.Sader, J.S., Hamilton, S.M., Hattori, K.H., Braundedr, K.Project unit: 07-32. Surface media geochemical sampling at the Victor kimberlite region, northern Ontario and the Kirkland Lake region northeastern Ontario.Ontario Geological Survey Open File, No. 6213, pp. 19-1-6.Canada, OntarioOverview field work
DS201112-0897
2011
Hamilton, S.M.Sader, J.A., Hattori, K.H., Kong, J.M., Hamilton, S.M., Brauneder, K.Geochemical responses in peat groundwater over Attawapiskat kimberlites, James Bay Lowlands, Canada and their application to diamond exploration.Geochemistry, Exploration, Environment, Analysis:, Vol. 11, pp. 193-210.Canada, Ontario, James Bay LowlandsGeochemistry
DS201312-0769
2013
Hamilton, S.M.Sader, J.A., Hattori, K., Brauneder, K., Hamilton, S.M.The influence of buried kimberlite on methane production in overlying sediment, Attawapiskat region, James Bay lowlands, Ontario.Chemical Geology, Vol. 360-361, pp. 173-185.Canada, Ontario, AttawapiskatMethane
DS202111-1782
2021
Hamilton, S.M.Sader, J.A., Harrison, A.L., McClenaghan, M.B., Hamilton, S.M., Clark, I.D.Sherwood Lollar, B., Leybourne, M.I.Generation of high-pH groundwaters and H2 gas by groundwater-kimberlite interaction, northeastern Ontario.The Canadian Mineralogist, Vol. 59, pp. 1261-1276. doi:10.3749/canmin.2000048 pdfCanada, Ontariodeposit - Kirkland Lake

Abstract: We report new isotopic data for H2 and CH4 gases and Sr for groundwater collected from Jurassic Kirkland Lake kimberlites in northern Ontario, Canada. Groundwaters interacting with kimberlites have elevated pH (up to 12.4), are reducing (Eh as low as the H2-H2O couple), are dominated by OH? alkalinity, and have non-radiogenic (mantle) 87Sr/86Sr values (?0.706-0.707). Most significantly, the highest pH groundwaters have low Mg, high K/Mg, and are associated with abundant reduced gases (H2 ± CH4). Open system conditions favor higher dissolved inorganic carbon and CH4 production, whereas under closed system conditions low DIC, elevated OH? alkalinity, and H2 production are enhanced. Hydrogen gas is isotopically depleted (?2HH2 = ?771 to ?801‰), which, combined with ?2HH2O, yields geothermometry temperatures of serpentinization of 5-25 °C. Deviation of H2-rich groundwaters (by up to 10‰) from the meteoric water line is consistent with Rayleigh fractionation during reduction of water to H2. Methane is characterized by ?13CCH4 = ?35.8 to ?68‰ and ?2HCH4 = ?434‰. The origin of CH4 is inconclusive and there is evidence to support both biogenic and abiogenic origins. The modeled groundwater-kimberlite reactions and production of elevated concentrations of H2 gas suggest uses for diamond-production tailings, as a source of H2 for fuel cells and as a carbon sink.
DS201711-2516
2017
Hamilton, T.L.Havig, J.R., Hamilton, T.L., Bachan, A., Kump, L.R.Sulfur and carbon isotopic evidence for metabolic pathway evolution and a four stepped Earth system progression across the Archean and Paleoproterozoic.Earth-Science Reviews, Vol. 174, pp. 1-21.Mantlegeochronology

Abstract: The Earth's mantle has provided a ready redox gradient of sulfur compounds (SO2, H2S) since the stabilization of the crust and formation of the ocean over 4 billion years ago, and life has evolved a multitude of metabolic pathways to take advantage of this gradient. These transitions are recorded in the sulfur and carbon isotope signals preserved in the rock record, in the genomic records of extant microorganisms, and in the changing mantle and crust structure, composition and cycling. Here, we have assembled approximately 20,000 sulfur (?34S, ?33S, ?36S) and carbon (?13C) isotope data points from scientific publications spanning over five decades of geochemical analyses on rocks deposited from 4.0 to 1.5 Ga. We place these data in the context of molecular clock and tectonic and surface redox indicators to identify overarching trends and integrate them into a holistic narrative on the transition of the Earth's surface towards more oxidizing conditions. The greatest extreme in ?34S values of sulfide minerals (? 45.5 to 54.9‰) and sulfate minerals (? 13.6 to 46.6‰) as well as ?13C values in carbonate minerals (? 16.8 to 29.6‰) occurred in the period following the Great Oxidation Event (GOE), while the greatest extremes in organic carbon ?13C values (? 60.9 to 2.4‰) and sulfide and sulfate mineral ?33S and ?36S values (? 4.0 to 14.3‰ and ? 12.3 to 3.2‰, respectively) occurred prior to the GOE. From our observations, we divide transitions in Earth's history into four periods: Period 1 (4.00 to 2.80 Ga) during which geochemical cycles were initialized, Period 2 (2.80 to 2.45 Ga) during which S and C isotope systems exhibit changes as conditions build up to the GOE, Period 3 (2.45 to 2.00 Ga) encompassing the GOE, and Period 4 (after 2.00 Ga) after which S and C isotopic systems remained relatively constant marking a time of Earth system geochemical quiescence. Using these periods, we link changes in S and C isotopes to molecular clock work to aid in interpreting emerging metabolic functions throughout Earth's history while underscoring the need for better proxies for robust evolutionary analyses. Specifically, results indicate: 1) an early development of sulfide oxidation and dissimilatory sulfite reduction followed by disproportionation and then sulfate reduction to sulfite resulting in a fully biologically mediated sulfur cycle by ~ 3.25 Ga; 2) support for the acetyl coenzyme-A pathway as the most likely earliest form of biologically mediated carbon fixation following methanogenesis; 3) an increasingly redox-stratified ocean in the Neoarchean with largely oxic surface water and euxinic bottom water during the first half of the Paleoproterozoic; and 4) that secular changes in Earth system crustal cycling dynamics and continent formation likely played a key role in driving the timing of the GOE. Finally, based on geochemical data, we suggest that the Paleoproterozoic be divided into a new Era of the Eoproterozoic (from 2.45 to 2.00 Ga) and the Paleoproterozoic (from 2.00 to 1.60 Ga).
DS2003-0345
2003
Hamilton, T.S.Dostal, J., Brietsprecher, K., Church, B.N., Thorkelson, D., Hamilton, T.S.Eocene melting of Precambrian lithospheric mantle: analcime bearing volcanic rocksJournal of Volcanology and Geothermal Research, Vol. 126, 3-4, Aug. 20, pp. 303-326.British ColumbiaMetasomatism
DS200412-0471
2003
Hamilton, T.S.Dostal, J., Brietsprecher, K., Church, B.N., Thorkelson, D., Hamilton, T.S.Eocene melting of Precambrian lithospheric mantle: analcime bearing volcanic rocks from the Challis Kam loops belt of south centrJournal of Volcanology and Geothermal Research, Vol. 126, 3-4, Aug. 20, pp. 303-326.Canada, British ColumbiaMetasomatism
DS2003-0542
2003
Hamilton, W.A.Hamilton, W.A.An alternative EarthGeology Today, Vol. 13, No. 11, Nov., pp. 4-12.GlobalHistory - tectonics
DS200412-0772
2003
Hamilton, W.A.Hamilton, W.A.An alternative Earth.Geology Today, Vol. 13, no. 11, Nov., pp. 4-12.TechnologyHistory - tectonics
DS1995-0733
1995
Hamilton, W.B.Hamilton, W.B.Subduction systems and magmatismin: volcanism Association with extension, Geological Society of London Special Paper, No. 81, pp. 3-28GlobalMagma, Subduction
DS1995-0734
1995
Hamilton, W.B.Hamilton, W.B.Subduction systems and magmatismvolcanism with extensions at plate Boundaries, Geological Society of London Special Paper 81, pp. 3-28.MantlePlate tectonics, Subduction
DS1998-0567
1998
Hamilton, W.B.Hamilton, W.B.Archean magmatism and deformation were not products of plate tectonicsPrecambrian Research, Vol. 91, No. 1-2, Aug. 1, pp. 143-180MantleMagmatism, Tectonics
DS1998-0568
1998
Hamilton, W.B.Hamilton, W.B.Archean magmatism and deformation were not products of plate tectonicsPrecambrian Research, Vol. 91, No. 1-2, Aug. 1, pp. 143-180.MantleTectonics, Magmatism - not specific to diamonds
DS2002-0642
2002
Hamilton, W.B.Hamilton, W.B.Driving mechanism and dynamic framework of plate tectonics: implications of top side tectonics.Geological Society of America Annual Meeting Oct. 27-30, Abstract p. 21.California, mantleSubduction
DS2002-0643
2002
Hamilton, W.B.Hamilton, W.B.Plate tectonic circulation is driven by cooling from the top and is closed within the upper mantle.Gac/mac Annual Meeting, Saskatoon, Abstract Volume, P.45., p.45.MantleTectonics, Subduction
DS2002-0644
2002
Hamilton, W.B.Hamilton, W.B.Plate tectonic circulation is driven by cooling from the top and is closed within the upper mantle.Gac/mac Annual Meeting, Saskatoon, Abstract Volume, P.45., p.45.MantleTectonics, Subduction
DS200712-0406
2006
Hamilton, W.B.Hamilton, W.B.Earth's first two billion years - the era of internally mobile crust.Geological Society of America Annual Meeting, Vol. 38, 7, Nov. p. 211 abstractMantleTectonics
DS200812-0444
2007
Hamilton, W.B.Hamilton, W.B.Earth's first 2 billion years - the era of internally mobile crust.Geological Society of America, Memoir Framework of continental crust, No. 200, pp. 233-296.MantleReview
DS200812-0445
2007
Hamilton, W.B.Hamilton, W.B.Driving mechanism and 3-D circulation of plate tectonics.Geological Society of America, Special Paper 433, pp. 1-26.MantleTectonics
DS201112-0406
2011
Hamilton, W.B.Hamilton, W.B.Plate tectonics began in Neoproterozoic time, plumes from deep mantle have never opened.Lithos, In press available, 20p.MantlePlume
DS201312-0273
2013
Hamilton, W.B.Foulger, G.R., Panza, G.F., Artemieva, I.M., Bastow, I.D., Cammarano, F., Evans, J.R., Hamilton, W.B., Julian, B.R., Lustrino, M., Thybo, H., Yanovskaya, T.B.Caveat on tomographic images.Terra Nova, Vol. 25, 4, pp. 259-281.MantleSeismic tomography, geodynamics
DS201312-0358
2013
Hamilton, W.B.Hamilton, W.B.Evolution of the Archean Mohorovic discontinuity from a synaccretionary 4.5 Ga protocrust.Tectonophysics, Vol. 609, pp. 706-733.MantleTectonics
DS1992-0728
1992
Hamilton, W.N.Hora, Z.D., Hamilton, W.N., Grant, B., Kelly, P.D.Industrial minerals of Alberta and British Columbia, Canada. Proceedings Of the 27th. Forum on geology of industrial mineralsBritish Columbia Department of Mines, Paper No. 1991-23, 214p. $ 30.00British Columbia, AlbertaIndustrial minerals, Table of contents
DS1999-0284
1999
Hamilton, W.N.Hamilton, W.N., Price, M.C., Langenberg, C.W.Geological map of AlbertaAlberta Geological Survey, 1:1, 000, 000AlbertaMap - not specific to diamonds
DS1910-0285
1912
Hamilton-Browne, G.Hamilton-Browne, G.A Lost Legionaire in South AfricaUnknown., 308P.South AfricaKimberley, Idb, Diamonds
DS1975-0288
1976
Hamilton-Hill, D. (PSEUD. J. GAWAINE).Hamilton-Hill, D. (PSEUD. J. GAWAINE).The Diamond SeekerJohannesburg: Macmillan., 184P.Tanzania, East AfricaKimberlite, Kimberley:janlib, Biography, Williamson
DS201604-0636
2016
HamisiThomas, R.J, Spencer, C., Bushi, A.M., Baglow, N., Gerrit de Kock, B., Hortswood, M.S.A., Hollick, L., Jacobs, J., Kajara, S., Kaminhanda, G., Key, R.M., Magana, Z., McCourt, M.W., Momburi, P., Moses, F., Mruma, A., Myamilwa, Y., Roberts, N.M.W., HamisiGeochronology of the centra Tanzania craton and its southern and eastern orogenic margins.Precambrian Research, in press available 57p.Africa, TanzaniaGeochronology

Abstract: Geological mapping and zircon U-Pb/Hf isotope data from 35 samples from the central Tanzania Craton and surrounding orogenic belts to the south and east allow a revised model of Precambrian crustal evolution of this part of East Africa. The geochronology of two studied segments of the craton shows them to be essentially the same, suggesting that they form a contiguous crustal section dominated by granitoid plutons. The oldest orthogneisses are dated at ca. 2820 Ma (Dodoma Suite) and the youngest alkaline syenite plutons at ca. 2610 Ma (Singida Suite). Plutonism was interrupted by a period of deposition of volcano-sedimentary rocks metamorphosed to greenschist facies, directly dated by a pyroclastic metavolcanic rock which gave an age of ca. 2725 Ma. This is supported by detrital zircons from psammitic metasedimentary rocks, which indicate a maximum depositional age of ca. 2740 Ma, with additional detrital sources 2820 and 2940 Ma. Thus, 200 Ma of episodic magmatism in this part of the Tanzania Craton was punctuated by a period of uplift, exhumation, erosion and clastic sedimentation/volcanism, followed by burial and renewed granitic to syenitic magmatism. In eastern Tanzania (Handeni block), in the heart of the East African Orogen, all the dated orthogneisses and charnockites (apart from those of the overthrust Neoproterozoic granulite nappes), have Neoarchaean protolith ages within a narrow range between 2710 and 2630 Ma, identical to (but more restricted than) the ages of the Singida Suite. They show evidence of Ediacaran "Pan-African" isotopic disturbance, but this is poorly defined. In contrast, granulite samples from the Wami Complex nappe were dated at ca. 605 and ca. 675 Ma, coeval with previous dates of the "Eastern Granulites" of eastern Tanzania and granulite nappes of adjacent NE Mozambique. To the south of the Tanzania Craton, samples of orthogneiss from the northern part of the Lupa area were dated at ca. 2730 Ma and clearly belong to the Tanzania Craton. However, granitoid samples from the southern part of the Lupa "block" have Palaeoproterozoic (Ubendian) intrusive ages of ca. 1920 Ma. Outcrops further south, at the northern tip of Lake Malawi, mark the SE continuation of the Ubendian belt, albeit with slightly younger ages of igneous rocks (ca. 1870-1900 Ma) which provide a link with the Ponte Messuli Complex, along strike to the SE in northern Mozambique. In SW Tanzania, rocks from the Mgazini area gave Ubendian protolith ages of ca. 1980-1800 Ma, but these rocks underwent Late Mesoproterozoic high-grade metamorphism between 1015 and 1040 Ma. One granitoid gave a crystallisation age of ca. 1080 Ma correlating with known Mesoproterozoic crust to the east in SE Tanzania and NE Mozambique. However, while the crust in the Mgazini area was clearly one of original Ubendian age, reworked and intruded by granitoids at ca. 1 Ga, the crust of SE Tanzania is a mixed Mesoproterozoic terrane and a continuation from NE Mozambique. Hence the Mgazini area lies at the edge of the Ubendian belt which was re-worked during the Mesoproterozoic orogen (South Irumide belt), providing a further constraint on the distribution of ca. 1 Ga crust in SE Africa. Hf data from near-concordant analyses of detrital zircons from a sample from the Tanzania Craton lie along a Pb-loss trajectory (Lu/Hf = 0), extending back to ?3.9 Ga. This probably represents the initial depleted mantle extraction event of the cratonic core. Furthermore, the Hf data from all igneous samples, regardless of age, from the entire study area (including the Neoproterozoic granulite nappes) show a shallow evolution trend (Lu/Hf = 0.028) extending back to the same mantle extraction age. This implies the entire Tanzanian crust sampled in this study represents over 3.5 billion years of crustal reworking from a single crustal reservoir and that the innermost core of the Tanzanian Craton that was subsequently reworked was composed of a very depleted, mafic source with a very high Lu/Hf ratio. Our study helps to define the architecture of the Tanzanian Craton and its evolution from a single age-source in the early Eoarchaean.
DS1860-0105
1870
Hamlin, A.C.Hamlin, A.C.The Gems of the United StatesAmerican Association Proceedings, Vol. 18, PP. 210-216.United StatesGemology
DS1860-0435
1884
Hamlin, A.C.Hamlin, A.C.Leisure Hour Among the GemsBoston: James R. Osgood And Co., 300P.Africa, South AfricaKimberley
DS1860-0436
1884
Hamlin, A.C.Hamlin, A.C.Diamonds in Georgia. #1Leisure Hours Among The Gems, PP. 49-51.United States, Georgia, North Carolina, AlabamaDiamond Occurrence
DS201506-0272
2015
Hamling, I.J.Hamling, I.J., Wallace, L.M.Silent triggering: aseismic crustal faulting induced by a subduction slow slip event.Earth and Planetary Science Letters, Vol. 421, pp. 13-19.MantleSubduction
DS2001-0441
2001
Hamma, J.Hamma, J., Suito, K.Thermoelastic models of minerals and the composition of the Earth's lower mantlePhysics of the Earth and Planetary Interiors, Vol. 125, No. 1-4, pp. 147-66.MantleGeophysics - seismics, Perovskites, magnesiowustite
DS1990-0645
1990
Hammack, J.L.Hammack, J.L., Nixon, G.T., Wong, R.H., Paterson, W.P.E.Geology and noble metal geochemistry of the Wrede Creek ultramafic North-central British ColumbiaBritish Columbia Mineral Resources Division, Paper 1990-1, pp. 405-416British ColumbiaAlaskan type ultramafic complex, Wrede Creek complex
DS1990-1114
1990
Hammack, J.L.Nixon, G.T., Hammack, J.L., Connelly, J.N., Case, G., PatersonGeology and noble metal geochemistry of the Polarisultramafic complex, North-central British ColumbiaBritish Columbia Mineral Resources Division, Paper 1990-1, pp. 387-404British ColumbiaAlaskan type ultramafic complex, Polaris complex
DS1990-1115
1990
Hammack, J.L.Nixon, G.T., Hammack, J.L., Paterson, W.P.E.Geology and noble metal geochemistry of the Johanson Lake ultramaficcomplex, North-central British ColumbiaBritish Columbia Mineral Resources Division, Paper 1990-1, pp. 417-426British ColumbiaAlaskan type ultramafic complex, Johanson Lake complex
DS1993-0623
1993
Hammarstrom, J.M.Hammarstrom, J.M., Zientek, M.L., Elliott, J.E.Mineral resource assessment of the Absaroka-Beartooth study area, Custer and Gellatin national forests, MontanaUnited States Geological Survey (USGS) Open File, No. 93-0207, 295p. 19 maps $ 136.00MontanaMineral Resource study
DS1997-0296
1997
Hammen, J.L.Dunnigan, G.M., Hammen, J.L., Harris, T.R.A SAS-IML program for implementing two phase regression analysis of geophysical time series dataComputers and Geosciences, Vol. 23, No. 7, pp. 763-770GlobalComputers, Program - SAS-IML
DS2000-0903
2000
HammerSmith, C.P., Bosshart, G., Pnahlo, Hammer, KlapperGE POL diamonds: before and after. Type 11a and HPHT annealing .Gems and Gemology., Vol. 36, Fall, pp. 192-215.GlobalDiamond - enhancement, colour change, Cathodluminescence, photoluminescence
DS202002-0183
2019
Hammer, J.E.First, E.C., Leonhardi, T.C., Hammer, J.E.Effects of superheating magnitude on olivine growth.Contributions to Mineralogy and Petrology, Vol. 175, 13p. pdfMantlemagmatism

Abstract: Magmatic superheating is a condition with relevance to natural systems as well as experimental studies of crystallization kinetics. Magmas on Earth and other planetary bodies may become superheated during adiabatic ascent from the mantle or as a consequence of meteorite impact-generated crustal melting. Experimental studies of igneous processes commonly employ superheating in the homogenization of synthetic starting materials. We performed 1-atmosphere dynamic crystallization experiments to study the effects of superliquidus thermal history on the morphologies and compositions of subsequently grown olivine crystals. An ultramafic volcanic rock with abundant olivine was fused above the experimentally determined liquidus temperature (1395 °C), held for 0, 3, or 12 h, cooled at 25 °C h?1, and quenched from 200 °C below the liquidus, all at constant fO2, corresponding to FMQ-2?±?0.2 log units. An increase in olivine morphologic instability is correlated with superheating magnitude, parameterized as the integrated time the sample is held above the liquidus (“TtL”; °C h). We infer that a delay in nucleation, which intensifies monotonically with increasing TtL, causes crystal growth to be increasingly rapid. This result indicates that the structural relaxation time scale controlling the formation of crystal nuclei is (a) far longer than the time scale associated with viscous flow and (b) exceeds the liquidus dwell times typically imposed in crystallization experiments. The influence of magmatic superheating on crystal morphology is similar in sense and magnitude to that of subliquidus cooling rate and thus, both factors should be considered when interpreting the thermal history of a volcanic rock containing anhedral olivine.
DS1997-0468
1997
Hammer, P.T.C.Hammer, P.T.C., Clowes, R.M.MOHO reflectivity patterns - a comparison of Canadian LithoprobetransectsTectonophysics, Vol. 269, No. 3-4, Feb. 15, pp. 179-198CanadaLithoprobe, Geophysics - seismics
DS2003-0543
2003
Hammer, P.T.C.Hammer, P.T.C., Clowes, R.M., Ramachandran, K.Seismic reflection techniques for imaging Diamondiferous kimberlite dykes: a case studyGeological Association of Canada Annual Meeting, Abstract onlyNorthwest TerritoriesGeophysics - seismics
DS2003-0544
2003
Hammer, P.T.C.Hammer, P.T.C., Ramachandran, K., Clowes, R.M.Seismic imaging of thin, Diamondiferous kimberlite dykes8 Ikc Www.venuewest.com/8ikc/program.htm, Session 8, AbstractGlobalDiamond exploration - geophysics, seismics
DS200412-0773
2004
Hammer, P.T.C.Hammer, P.T.C., Clowes, R.M.Accreted terranes of northwestern British Columbia, Canada: lithospheric velocity structure and tectonics.Journal of Geophysical Research, Vol. 109, B6, 10.1029/2003 JB002749Canada, British ColumbiaGeophysics - seismics
DS200412-0774
2003
Hammer, P.T.C.Hammer, P.T.C., Clowes, R.M., Ramachandran, K.Seismic reflection techniques for imaging Diamondiferous kimberlite dykes: a case study from Snap Lake, N.W.T.Geological Association of Canada Annual Meeting, Abstract onlyCanada, Northwest TerritoriesGeophysics - seismics
DS200412-0775
2003
Hammer, P.T.C.Hammer, P.T.C., Ramachandran, K., Clowes, R.M.Seismic imaging of thin, Diamondiferous kimberlite dykes.8 IKC Program, Session 8, AbstractTechnologyDiamond exploration - geophysics, seismics
DS200512-0173
2004
Hammer, P.T.C.Clowes, R.M., Fernandez Viejo, G., Hammer, P.T.C., Welford, J.K.Lithospheric structure in northwestern Canada from lithoprobe P and S wave refraction profiles: a synthesis.Geological Society of America Annual Meeting ABSTRACTS, Nov. 7-10, Paper 112-9, Vol. 36, 5, p. 271.Canada, British Columbia, Yukon, Northwest territoriesGeophysics - seismics, R/WAR, Stikinia
DS200512-0395
2004
Hammer, P.T.C.Hammer, P.T.C., Clowes, R.M., Ramachandran, K.High resolution seismic reflection imaging of a thin, Diamondiferous dyke.Geophysics, Vol. 69, 5, pp. 1143-1154.Canada, Northwest TerritoriesGeophysics - seismics, Snap Lake
DS201012-0264
2010
Hammer, P.T.C.Hammer, P.T.C., Clowes, R.M., Cook, F.A., Van der Velden, A.J., Vasudevan, K.The lithoprobe trans continental lithospheric cross sections: imaging the internal structure of the North American continent.Canadian Journal of Earth Sciences, Vol. 47, 5, pp. 821-957.Canada, United StatesGeophysics - seismics
DS1997-0469
1997
Hammer, S.Hammer, S., Relf, C.Western Churchill Province: recent results, fresh perspectives, newinitiatives.Geological Survey of Canada Forum 1997 abstracts, p. 4. AbstractSaskatchewanCraton, Structure
DS2002-0645
2002
Hammerbeck, E.Hammerbeck, E., Frost-Killan, S.Topical aspects of the geotectonic and metallogenic evolution of Africa11th. Quadrennial Iagod Symposium And Geocongress 2002 Held Windhoek, Abstract p. 27.AfricaMagmatism - metallogeny, diamonds
DS1982-0405
1982
Hammerbeck, E.C.I.Martini, J.E.J., Hammerbeck, E.C.I., et al.Mineral Map of the Republics of South Africa, Transkei, Bophuthatswana, Venda and Ciskei and the Kingdoms of Lesotho And Swaziland.Department MINERAL AND ENERGY AFFAIRS, MAP 1:1, 1000, 000. 4 SHEETS.South Africa, Lesotho, Swaziland, Southern AfricaGeology, Mineral Resources, Diamonds
DS1992-0658
1992
Hammerbeck, E.C.I.Hammerbeck, E.C.I.Can minerals sustain prosperity for all?South African Journal of Geology, Vol. 95, No. 5-6, pp. 151-158GlobalEconomics, Mining industry
DS1998-0569
1998
Hammerbeck, E.C.I.Hammerbeck, E.C.I.Resource and reserve classificationSouth Africa Council, Handbook # 16, pp. 32-39.South AfricaEconomic geology, Ore reserves, geostatistics, legal
DS201612-2291
2016
Hammerli, J.Cook, Y.A., Sanislav, I.V., Hammerli, J., Blenkinsop, T.G., Dirks, P.H.G.M.A primitive mantle source for the Neoarchean mafic rocks from the Tanzania Craton.Geoscience Frontiers, Vol. 7, pp. 911-926.Africa, TanzaniaMantle

Abstract: Mafic rocks comprising tholeiitic pillow basalt, dolerite and minor gabbro form the basal stratigraphic unit in the ca. 2.8 to 2.6 Ga Geita Greenstone Belt situated in the NW Tanzania Craton. They outcrop mainly along the southern margin of the belt, and are at least 50 million years older than the supracrustal assemblages against which they have been juxtaposed. Geochemical analyses indicate that parts of the assemblage approach high Mg-tholeiite (more than 8 wt.% MgO). This suite of samples has a restricted compositional range suggesting derivation from a chemically homogenous reservoir. Trace element modeling suggests that the mafic rocks were derived by partial melting within the spinel peridotite field from a source rock with a primitive mantle composition. That is, trace elements maintain primitive mantle ratios (Zr/Hf = 32-35, Ti/Zr = 107-147), producing flat REE and HFSE profiles [(La/Yb)pm = 0.9-1.3], with abundances of 3-10 times primitive mantle and with minor negative anomalies of Nb [(Nb/La)pm = 0.6-0.8] and Th [(Th/La)pm = 0.6-0.9]. Initial isotope compositions (?Nd) range from 1.6 to 2.9 at 2.8 Ga and plot below the depleted mantle line suggesting derivation from a more enriched source compared to present day MORB mantle. The trace element composition and Nd isotopic ratios are similar to the mafic rocks outcropping ?50 km south. The mafic rocks outcropping in the Geita area were erupted through oceanic crust over a short time period, between ?2830 and ?2820 Ma; are compositionally homogenous, contain little to no associated terrigenous sediments, and their trace element composition and short emplacement time resemble oceanic plateau basalts. They have been interpreted to be derived from a plume head with a primitive mantle composition.
DS200612-1452
2006
Hammerschmidt, K.Upadhyay, D., Raith, M.M., Mezger, K., Hammerschmidt, K.Mesoproterozoic rift related alkaline magmatism at Elchuru, Prakasam alkaline province, SE India.Lithos, Vol. 89, 3-4, July pp. 447-477.IndiaBasanites, Tectonics, magmatism, Eastern Gnats Belt
DS1999-0224
1999
Hammerscmidt, K.Franz, G., Steiner, G., Hammerscmidt, K.Plume related alkaline magmatism in central Africa... the Meidob Hills ( Western Sudan).Chemical Geology, Vol. 157, No. 1-2, May 3, pp. 27-48.GlobalAlkaline rocks, Hotspot, plume
DS1992-0458
1992
Hammerscon, K.Fiechtner, L., Friedrcih, H., Hammerscon, K.Geochemistry and geochronology of early Mesozoic tholeiites from centralMoroccoGeologische Rundschau, Vol. 81, No. 1, pp. 45-62MoroccoTholeiites, Geochemistry
DS1990-0646
1990
Hammett, R.Hammett, R.Application of numerical modeling to mining in CanadaThe Canadian Institute of Mining, Metallurgy and Petroleum (CIM) Annual Meeting Paper preprint, No. 45, 8pGlobalMining, Stability problems
DS1995-0735
1995
Hammond, A.Hammond, A., et al.Environmental indicators: a systematic approach to measuring and reporting on environmental policy perforM.World resources Institute, 43pUnited StatesBook - ad, Environmental indicators
DS201112-0407
1999
Hammond, A.Hammond, A.Mineralogy of accessory phases in the Swartsruggens orangeite, South Africa.Thesis, 'BSc. Lakehead University, Africa, South AfricaThesis - note availability based on request to author
DS2002-0646
2002
Hammond, A.L.Hammond, A.L., Mitchell, R.H.Accessory mineralogy of orangeite from Swartruggens, South AfricaMineralogy and Petrology, Vol. 76, 1-2, pp. 1-19.South AfricaMineralogy, Deposit - Swartruggens
DS2002-0647
2002
Hammond, A.L.Hammond, A.L., Mitchell, R.H.Accessory mineralogy of orangeite from Swartruggens, South AfricaMineralogy and Petrology, Vol. 76, No. 1-2, pp. 1-19.South AfricaPetrology, Deposit - Swartzruggens
DS1940-0211
1949
Hammond, C.R.Hammond, C.R.Geologic Map and Structure Sections of East Flank of Laramie Range in the Vicinity of Iron Mountain, Albany and Laramiecounties.Msc. Thesis, University Wyoming, United States, Wyoming, Rocky MountainsRegional Studies
DS201901-0090
2018
Hammond, D. P.Witt, W.K., Hammond, D. P., Hughes, M.Geology of the Ngualla carbonatite complex, Tanzania, and origin of the weathered bastnaesite zone REE ore.Ore Geology Reviews, doi.org/10.1016/j.oregeorev.2018.12.002 65p. Africa, Tanzaniadeposit - Ngualla

Abstract: The late Mesoproterozoic Ngualla carbonatite complex in southwest Tanzania comprises a central magnesiocarbonatite plug surrounded sequentially by an annular calcite carbonatite intrusion and fenitised felsic igneous country rocks. The calcite carbonatite contains phlogopite-rich (glimmerite) enclaves interpreted as fenitised wallrock xenoliths that have contributed silicate minerals, apatite and magnetite through dispersal and interaction, mainly within the calcite carbonatite magma. Ultramafic magmas were emplaced into the magnesiocarbonatite magma chamber before complete solidification of the magnesiocarbonatite. Contemporaneity allowed the two magmas to mingle. Rounded enclaves of hematite-barite in the magnesiocarbonatite are tentatively attributed to magma immiscibility. Following complete solidification of the calcite carbonatite, and overlapping late crystallization of the magnesiocarbonatite plug, late magnesiocarbonatite dikes and ultramafic dikes were emplaced, some of the latter as diatremes. Crystallization of ferroan dolomite in the magnesiocarbonatite plug resulted in residual magmatic concentration of Si, Ba, F and rare earth elements (REE), and crystallization of barite, quartz, calcite, fluorite and REE fluorocarbonates in miarolitic cavities. Concentrations of (total) rare earth oxides (TREO) in the unweathered magnesiocarbonatite are 1 to 2%. REE ore with 3 to 6% TREO resulted from weathering, during which CaCO3 and MgCO3 were leached from ferroan dolomite leaving a porous goethite-rich residue containing barite and bastnaesite, the latter having replaced primary synchesite. Other commodities with potential economic significance include phosphate and niobium, both of which were enriched by residual accumulation over the calcite carbonatite as a result of karstic weathering. Although weathering was a critical factor in the formation of REE ore at Ngualla, the primary proto-ore resulted mainly from in situ igneous processes. This genetic model is different from that used to account for many carbonatite-hosted ore bodies, which result from late-stage hydrothermal processes. Examples of hydrothermal rare earth deposits include those of the late Jurassic to early Cretaceous Chilwa Province, located 800?km south of Ngualla. The differences in ore-forming processes may reflect the relative ages of the carbonatites and a deeper level of erosion at Ngualla.
DS201904-0799
2019
Hammond, D.P.Witt, W.K., Hammond, D.P., Hughes, M.Geology of the Ngualla carbonatite complex, Tanzania and origin of the weathered bastnaesite zone REE ore.Ore Geology Reviews, Vol. 105, pp. 28-54.Chinacarbonatite
DS1994-1681
1994
Hammond, D.R.Stagg, A.K., Hammond, D.R.Environmental site assessments in the acquisition of industrial mineralassetsAmerican Institute of Mining, Metallurgical, and Petroleum Engineers (AIME) Preprint, Meeting held Albuquerque Feb. 14-17th, No. 94-75, 8pUnited StatesMining -environmental, Industrials
DS2002-0648
2002
Hammond, E.C.Hammond, E.C.A sample examination of 'diamond carbonados'Eos, American Geophysical Union, Spring Abstract Volume, Vol.83,19, 1p.Central African RepublicGeophysics - magnetics, Diamond - morphology
DS200612-0525
2006
Hammond, G.P.Hammond, G.P.People, planet and prosperity: the determinants of humanity's environmental footprint.Natural Resources Forum, Vol. 30, 1, Feb pp. 27-36.GlobalSocial responsibility
DS1989-0579
1989
Hammond, I.Hammond, I.CRA -the Australian connectionEngineering and Mining Journal, Vol. 190, No. 6, August pp. 40-43AustraliaCompany profile -CRA., Economics
DS1986-0337
1986
Hammond, J.G.Hammond, J.G.Geochemistry and petrogenesis of Proterozoic diabase in the southern Death Valley region of CaliforniaContributions to Mineralogy and Petrology, Vol. 93, No. 3, pp. 312-321CaliforniaEclogite
DS201802-0232
2017
Hammond, J.O.S.Ebinger, C.J., Keir, D., Bastow, I.D., Whaler, K., Hammond, J.O.S., Miller, A.A., Tiberi, M.S., Hautot, S.Crustal structure of active deformation zones in Africa: implications for global crustal processes.Tectonics, Vol. 36, 10.1002/2017TC004526Africatectonics

Abstract: The Cenozoic East African rift (EAR), Cameroon Volcanic Line (CVL), and Atlas Mountains formed on the slow-moving African continent, which last experienced orogeny during the Pan-African. We synthesize primarily geophysical data to evaluate the role of magmatism in shaping Africa's crust. In young magmatic rift zones, melt and volatiles migrate from the asthenosphere to gas-rich magma reservoirs at the Moho, altering crustal composition and reducing strength. Within the southernmost Eastern rift, the crust comprises ~20% new magmatic material ponded in the lower crust and intruded as sills and dikes at shallower depths. In the Main Ethiopian Rift, intrusions comprise 30% of the crust below axial zones of dike-dominated extension. In the incipient rupture zones of the Afar rift, magma intrusions fed from crustal magma chambers beneath segment centers create new columns of mafic crust, as along slow-spreading ridges. Our comparisons suggest that transitional crust, including seaward dipping sequences, is created as progressively smaller screens of continental crust are heated and weakened by magma intrusion into 15-20 km thick crust. In the 30 Ma Recent CVL, which lacks a hot spot age progression, extensional forces are small, inhibiting the creation and rise of magma into the crust. In the Atlas orogen, localized magmatism follows the strike of the Atlas Mountains from the Canary Islands hot spot toward the Alboran Sea. CVL and Atlas magmatism has had minimal impact on crustal structure. Our syntheses show that magma and volatiles are migrating from the asthenosphere through the plates, modifying rheology, and contributing significantly to global carbon and water fluxes.
DS201807-1510
2018
Hammond, J.O.S.Magee, C., Stevenson, C.T.E., Ebmeier, S.K., Keir, D., Hammond, J.O.S., Gottsmann, J.H., Whaler, K.A., Schofield, N., Jackson, C.A-L., Petronis, M.S., O'Driscoll, B., Morgan, J., Cruden, A., Vollgger, S.A., Dering, G., Micklethwaite, S., Jackson, M.D.Magma plumbing systems: a geophysical perspective. InSAR, GPS, GNSS, FWI, UAVsJournal of Petrology, in press available, 99p.Mantlemagmatism - geophysics

Abstract: Over the last few decades, significant advances in using geophysical techniques to image the structure of magma plumbing systems have enabled the identification of zones of melt accumulation, crystal mush development, and magma migration. Combining advanced geophysical observations with petrological and geochemical data has arguably revolutionised our understanding of, and afforded exciting new insights into, the development of entire magma plumbing systems. However, divisions between the scales and physical settings over which these geophysical, petrological, and geochemical methods are applied still remain. To characterise some of these differences and promote the benefits of further integration between these methodologies, we provide a review of geophysical techniques and discuss how they can be utilised to provide a structural context for and place physical limits on the chemical evolution of magma plumbing systems. For example, we examine how Interferometric Synthetic Aperture Radar (InSAR), coupled with Global Positioning System (GPS) and Global Navigation Satellite System (GNSS) data, and seismicity may be used to track magma migration in near real-time. We also discuss how seismic imaging, gravimetry, and electromagnetic data can identify contemporary melt zones, magma reservoirs, and, or, crystal mushes. These techniques complement seismic reflection data and rock magnetic analyses that delimit the structure and emplacement of ancient magma plumbing systems. For each of these techniques, with the addition of full-waveform inversion (FWI), the use of Unmanned Aerial Vehicles (UAVs), and the integration of geophysics with numerical modelling, we discuss potential future directions. We show that approaching problems concerning magma plumbing systems from an integrated petrological, geochemical, and geophysical perspective will undoubtedly yield important scientific advances, providing exciting future opportunities for the volcanological community.
DS1992-0659
1992
Hammond, P.E.Hammond, P.E., Brunstead, K.A.Possible hotspot track in the Pacific northwestGeological Society of America (GSA) Abstract Volume, Vol. 24, No. 5, May p. 30. abstract onlyOregon, WashingtonHot spot, Geochemistry
DS200712-0407
2007
Hammond, S.J.Hammond, S.J., Parkinson, I.J., James, R.H., Rogers, N.W., Harvey, J.Delta 7 Li systematics of mantle xenoliths from Kilbourne Hole: unravelling metasomatic and differential processes.Plates, Plumes, and Paradigms, 1p. abstract p. A373.United States, New Mexico, Colorado PlateauMetasomatism
DS201212-0287
2012
Hammond, S.J.Harvey, J., Yoshikawa, M., Hammond, S.J., Burton, K.W.Deciphering the trace element characteristics in Kilbourne Hole peridotite xenoliths: melt-rock interaction and metasomatism beneath the Rio Grande rift, SW USA.Journal of Petrology, Vol. 53, 8, pp. 1709-1742.United StatesXenoliths
DS201412-0088
2014
Hammor, D.Caby, R., Bruguier, O., Fernandez, L., Hammor, D., Bosch, D., Mechati, M., Laouar, R., Ouabadi, A., Abdallah, N., Douchet, C.Metamorphic diamonds in a garnet megacryst from the Edough Massif (northeastern Algeria)… Recognition and geodynamic consequences.Tectonophysics, Vol. 637, pp. 341-353.Africa, AlgeriaEdough Massif
DS201709-1965
2017
Hammor, D.Bruguier, O., Bosch, D., Caby, R., Vitale-Brovarone, A., Fernadez, L., Hammor, D., Laouar, R., Ouabadi, A., Abdallah, N., Mechanti, M.Age of UHP metamorphism in the Western Mediterranean: insight from rutile and minute zircon inclusions in a diamond bearing garnet megacryst ( Edough Massif, NE Algeria).Earth and Planetary Science Letters, Vol. 474, pp. 215-225.Africa, Algeriadiamond inclusions

Abstract: Diamond-bearing UHP metamorphic rocks witness for subduction of lithospheric slabs into the mantle and their return to shallow levels. In this study we present U-Pb and trace elements analyses of zircon and rutile inclusions from a diamond-bearing garnet megacryst collected in a mélange unit exposed on the northern margin of Africa (Edough Massif, NE Algeria). Large rutile crystals (up to 300 ?m in size) analyzed in situ provide a U-Pb age of 32.4 ± 3.3 Ma interpreted as dating the prograde to peak subduction stage of the mafic protolith. Trace element analyses of minute zircons (?30 ?m) indicate that they formed in equilibrium with the garnet megacryst at a temperature of 740-810 °C, most likely during HP retrograde metamorphism. U-Pb analyses provide a significantly younger age of 20.7 ± 2.3 Ma attributed to exhumation of the UHP units. This study allows bracketing the age of UHP metamorphism in the Western Mediterranean Orogen to the Oligocene/early Miocene, thus unambiguously relating UHP metamorphism to the Alpine history. Exhumation of these UHP units is coeval with the counterclockwise rotation of the Corsica-Sardinia block and most likely resulted from subduction rollback that was driven by slab pull.
DS2001-0926
2001
Hammouda, T.Pin, C., Paquette, J.L., Moonchoux, P., Hammouda, T.First field scale occurrence of Silicon, Aluminum, Sodium rich low degree partial melts from the upper mantle.Journal of Geology, Vol. 29, No. 5, May, pp. 451-4.MantlePeridoite, glass inclusions, partial melts, uppermantle
DS2003-0545
2003
Hammouda, T.Hammouda, T.High pressure melting of carbonated eclogite and experimental constraints on carbonEarth and Planetary Science Letters, Vol. 214, 1-2, pp.357-68.MantleUHP, carbon
DS200412-0776
2003
Hammouda, T.Hammouda, T.High pressure melting of carbonated eclogite and experimental constraints on carbon recycling and storage in the mantle.Earth and Planetary Science Letters, Vol. 214, 1-2, pp.357-68.MantleUHP, carbon
DS200912-0146
2009
Hammouda, T.Dalou, C., Koga, K.T., Hammouda, T., Poitrasson, F.Trace element partitioning between carbonatitic melts and mantle transition zone minerals: implications for the source of carbonatites.Geochimica et Cosmochimica Acta, Vol. 73, 1, Jan. pp. 239-255.MantleCarbonatite
DS201012-0169
2010
Hammouda, T.Doucelance, R., Hammouda, T., Moreira, M., Martins, J.C.Geochemical constraints on depth of origin of oceanic carbonatites: The Cape Verde Case.Geochimica et Cosmochimica Acta, Vol. 74, 24, pp. 7261-7282.Europe, Cape Verde IslandsCarbonatite
DS201012-0265
2010
Hammouda, T.Hammouda, T., Chantel, J., Devidal, J-L.Apatite solubility in carbonatitic liquids and trace element partitioning between apatite and carbonatite at high pressure.Geochimica et Cosmochimica Acta, Vol. 74, 24, pp. 7220-7235.TechnologyCarbonatite
DS201112-0408
2011
Hammouda, T.Hammouda, T., Andrault, D., Koga, K., Katsura, T., Martin, M.Ordering in double carbonates and implications for processes at subduction.Contributions to Mineralogy and Petrology, Vol. 161, 3, pp. 439-450.MantleSubduction
DS201112-0646
2011
Hammouda, T.Martin, A.M., Hammouda, T.Role of iron and 6 GPa a potential mechanism for diamond formation during subduction.European Journal of Mineralogy, Vol. 23, 1, pp. 5-16.MantleDiamond genesis
DS201112-0647
2011
Hammouda, T.Martin, A.M., Hammouda, T.Role of iron and reducing conditions on the stability of dolomite + coesite between 4.25 and 6 GPa - a potential mechanism for diamond formation during subductionEuropean Journal of Mineralogy, Vol. 23, 1, pp. 5-16.MantleSubduction, diamond genesis
DS201212-0445
2012
Hammouda, T.Martin, A.M., Laporte, D., Koga, K.T., Kawamoto, T., Hammouda, T.Experimental study of the stability of a dolomite + coesite assemblage in contact with peridotite: implications for sediment-mantle interaction and diamond formation during subduction.Journal of Petrology, Vol. 53, 2, pp. 391-417.TechnologyUHP, diamond genesis
DS201212-0446
2012
Hammouda, T.Martin, A.M., Laporte, D., Koga, K.T., Kawamoto, T., Hammouda, T.Experimental stidy of the stability of a dolomite + coesite assembalge in contact with peridotite: implications for sediment-mantle interaction and diamond formation during subduction.Journal of Petrology, Vol. 53, 2, pp. 391-417.MantleSubduction
DS201412-0204
2014
Hammouda, T.Doucelance, R., Bellot, N., Boyet, M., Hammouda, T., Bosq, C.What coupled cerium and neodynium isotopes tell us about the deep source of oceanic carbonatites.Earth and Planetary Science Letters, Vol. 407, pp. 175-195.Europe, Cape Verde Islands, Africa, MoroccoCarbonatite
DS201412-0336
2014
Hammouda, T.Hammouda, T., Chantel, J., Manthilake, G., Guignard, J., Crichton, W.Hot mantle geotherms stabilize calcic carbonatite magmas up to the surface.Geology, Vol. 42, no. 10, pp. 911-914.MantleCarbonatite
DS201503-0135
2015
Hammouda, T.Bouhifd, M.A., Boyet, M., Cartier, C., Hammouda, T., Bofan-Casanova, N., Devidal, J.L., Andrault, D.Superchondritic Sm/Nd ratio of the Earth: impact of Earth's core formation.Earth and Planetary Science Letters, Vol. 413, March 1, pp. 158-166.MantleGeochronology

Abstract: This study investigates the impact of Earth's core formation on the metal-silicate partitioning of Sm and Nd, two rare-earth elements assumed to be strictly lithophile although they are widely carried by the sulphide phases in reducing material (e.g. enstatite chondrites). The partition coefficients of Sm and Nd (DSmDSm and DNdDNd) between molten CI and EH chondrites model compositions and various Fe-rich alloys (in the Fe-Ni-C-Si-S system) have been determined in a multi-anvil between 3 and 26 GPa at various temperatures between 2073 and 2440 K, and at an oxygen fugacity ranging from 1 to 5 log units below the iron-wüstite (IW) buffer. The chemical compositions of the run products and trace concentrations in Sm and Nd elements were determined using electron microprobe and laser ablation inductively coupled plasma-mass spectrometry. Our results demonstrate the non-fractionation of Sm and Nd during the segregation of the metallic phases: the initial Sm/Nd ratio of about 1 in the starting materials yields precisely the same ratio in the recovered silicate phases after the equilibration with the metal phases at all conditions investigated in this study. In addition, DSmDSm and DNdDNd values range between 10?310?3 and 10?510?5 representing a low solubility in the metal. An increase of the partition coefficients is observed with decreasing the oxygen fugacity, or with an increase of S content of the metallic phase at constant oxygen fugacity. Thus, based on the actual Sm and Nd concentrations in the bulk Earth, the core should contain less than 0.4 ppb for Sm and less than 1 ppb for Nd. These estimates are three orders of magnitude lower than what would be required to explain the reported 142Nd excess in terrestrial samples relative to the mean chondritic value, using the core as a Sm-Nd complementary reservoir. In other words, the core formation processes cannot be responsible for the increase of the Sm/Nd ratio in the mantle early in Earth history.
DS201510-1771
2015
Hammouda, T.Hammouda, T., Keshav, S.Melting in the mantle in the presence of carbon: review of experiments and discussion on the origin of carbonatites.Chemical Geology, in press availableMantleCarbonatite

Abstract: Carbon emission at volcanic centers requires a constant balance between output (mostly by volcanism, either at plate boundaries or intraplate) and input (mostly at trench settings) of carbon from and to the Earth's mantle. The form of carbon that resides in the mantle is controlled by depth (pressure) and oxygen fugacity, the latter in turn depending on the depth and the concentration of iron in the mantle. In the shallow, lithospheric mantle, carbon is likely to be present in the oxidized form of CO2 (except under cratons where carbon is reduced to graphite or diamond). Below approximately 90 km, in the asthenosphere, the oxidized form of carbon is carbonate, either mineral or melt, depending on the thermal regime. At depths greater than approximately 150 km, the asthenospheric mantle is too reducing for carbon to stay in its oxidized form and only diamond is present, unless there is sufficient hydrogen to form reduced C-H fluids. Hence, the region located in the depth range of 90 to 150 km deep is where carbonatitic melts can most likely be produced and impregnate the surrounding mantle through metasomatism. The upper bound of this region is called the carbonate ledge. This limit prevents carbonate (either solid or molten) from ascending because of degassing and CO2 liberation. The lower bound is a redox front where redox melting (that is, melting caused by oxidation) may take place in an ascending portion of carbon-containing mantle. Carbonatite eruptions and presence of carbonate mineral inclusions in deep-seated diamonds provide evidence that these boundaries can be trespassed in some cases. An analysis of the experimental data that has bearing on silicate melting in the presence of carbon further shows that the carbonate ledge is a melting curve with a negative or flat Clapeyron (dP/dT) slope. In the carbonated ultrabasic (peridotite) systems, the carbonate ledge is located between ~ 2-3 GPa. The ledge divides the pressure-temperature space into a region of low-pressure silicate melt production, and a high-pressure region where carbonatites can be produced. Carbonatitic melts in equilibrium with mantle peridotite have compositions close to dolomitic (approximately equal amounts of Ca and Mg) with a general trend of becoming markedly more magnesian with increasing pressure. Calcic carbonatites may be stable at pressures < 2 GPa if clinopyroxene is absent. At mantle transition zone pressure range, there seems to be a melting temperature decrease (negative fusion slope), which may be caused by the stabilization of majoritic garnet. The carbonated basic (broadly eclogitic) system is more complex than the peridotitic one, because of the strong control of bulk silicate composition on melting temperatures, and hence, on melt composition. In carbonated eclogite systems, we propose that the effect of bulk composition upon all observed features can perhaps be related to silica super-saturation, or lack thereof. In some cases, high calcium (> 80 mol% CaCO3) melts can be produced, making the melting of carbonated eclogites an appealing scenario for the genesis of calcio-carbonatites in the Earth's mantle. Comparison with modeled pressure-temperature paths of subducted oceanic lithosphere shows that fusion of carbonated eclogite at depths shallower than 200 km should be expected for hot (Cascadian-type) subduction thermal regimes. On the other hand, in the case of cooler thermal regimes (Honshu-type, for instance), subducted carbonates may be stable to greater depths in Earth at trench settings, depending on the bulk composition of the system. Furthermore, high-pressure experiments show evidence of a continuum among carbonatitic, kimberlitic, melilititic, and basaltic liquids, for increasing melting degree of carbonated peridotite. This continuum has not been documented in the case of fusion of carbonated eclogite. It may be present, however, when certain sediments are fused, although the silicate melts are granitic to rhyodacitic instead of being kimberlitic in composition. Additional high-pressure work on phase relations in the simple binary system CaCO3-MgCO3 and specific focus on oxide solubility in the vapor phase have the potential to further clarify phase relations on complex silicate-carbonate systems at mantle conditions.
DS201707-1309
2017
Hammouda, T.Bouhifd, M.A., Clesi, V., Boujibar, A., Cartier, C., Hammouda, T., Boyet, M., Manthilake, G., Monteux, J., Andrault, D.Silicate melts during the Earth's core formation.Chemical Geology, Vol. 461, pp. 128-139.Mantlemelting

Abstract: Accretion from primordial material and its subsequent differentiation into a planet with core and mantle are fundamental problems in terrestrial and solar system. Many of the questions about the processes, although well developed as model scenarios over the last few decades, are still open and much debated. In the early Earth, during its formation and differentiation into rocky mantle and iron-rich core, it is likely that silicate melts played an important part in shaping the Earth's main reservoirs as we know them today. Here, we review several recent results in a deep magma ocean scenario that give tight constraints on the early evolution of our planet. These results include the behaviour of some siderophile elements (Ni and Fe), lithophile elements (Nb and Ta) and one volatile element (Helium) during Earth's core formation. We will also discuss the melting and crystallization of an early magma ocean, and the implications on the general feature of core-mantle separation and the depth of the magma ocean. The incorporation of Fe2 + and Fe3 + in bridgmanite during magma ocean crystallization is also discussed. All the examples presented here highlight the importance of the prevailing conditions during the earliest time of Earth's history in determining the composition and dynamic history of our planet.
DS200812-0255
2009
Hammouuda, T.Dalou, C., Koga, K.T., Hammouuda, T., Poitrasson, F.Trace element partitioning between carbonatitic melts and mantle transition zone minerals: implications for the source of carbonatites.Geochimica et Cosmochimica Acta, Vol. 73, 1, pp. 239-255.MantleCarbonatite
DS1991-1545
1991
Hamms, T.F.Severson, R.C., Stewart, K.C., Hamms, T.F.Partioning of elements between two size sediment fractions in samples from nineteen areas of the western United StatesUnited States Geological Survey (USGS) Open file, No. 91-0381, 18p. $ 3.25CordilleraSedimentology, Geochemistry -samples
DS2002-1229
2002
Hamner, S.Paul, D., Hamner, S., Tella, S., Peterson, T.D., Le Cheminant, A.N.Compilation bedrock geology of part of Western Churchill Province, Nunuvut-Northwest Territories.Geological Survey of Canada Open File, No. 4236, Map 1: 1,000,000 $19.50Northwest Territories, NunavutGeology - not specific to diamonds
DS1995-0736
1995
Hamoudi, M.Hamoudi, M., Achache, J., Cohen, Y.Global Magsat anomaly maps at ground levelEarth and Planetary Science Letters, Vol. 133, No. 3-4, July 15, pp. 533-548GlobalGeophysics -Magsat
DS1998-0570
1998
Hamoudi, M.Hamoudi, M., Cohen, Y., Achache, J.Can the thermal thickness of the continental lithosphere be estimated from Magsat data.Tectonophysics, Vol. 284, No. 1-2, Jan. 15, pp. 19-29.MantleGeophysics - MAGSAT., Crustal thickness
DS200812-0021
2008
Hamoudi, M.Allek, K., Hamoudi, M.Regional scale aeromagnetic survey of the south-west of Algeria: a tool for area selection for diamond exploration.Journal of African Earth Sciences, Vol. 50, no. 2, Feb. pp. 67-78.Africa, AlgeriaGeophysics - magnetics
DS1990-0154
1990
Hampton, C.M.Bailey, D.K., Hampton, C.M.Volatiles in alkaline magmatismLithos, Special Issue, Vol. 25, No. 4, pp. 157-166GlobalAlkaline rocks, Experimental petrology
DS1960-0678
1966
Hamscher, W.Hamscher, W.Diamanten und BrillantenIdar-oberstein: Buchdruckerei Behnert., 82P.GlobalDeposits, Investments, Cutting, Kimberley
DS200812-0015
2008
Hamza, V.M.Alexandrino, C.H., Hamza, V.M.Estimates of heat flow and heat production and a thermal model of the Sao Francisco craton.International Journal of Earth Sciences, Vol. 97, 2, April pp. 1437-3254South America, BrazilCraton, geothermometry
DS200812-0016
2008
Hamza, V.M.Alexandrino, C.H., Hamza, V.M.Estimates of heat flow and heat production and a thermal model of the Sao Francisco Craton.International Journal of Earth Sciences, Vol. 97, 2, pp. 289-306.South America, BrazilGeothermometry
DS201811-2579
2019
Hamzeh, A.Hamzeh, A., Mehramuz, M.The depth estimation of subsurface anomalies using probability tomography imaging method from airborne vertical gravity gradient. ( Not specific to diamonds).Journal of African Earth Sciences, Vol. 149, pp. 207-214.Globalgeophysics - gravity

Abstract: In this article, the probability tomography imaging method is applied to airborne vertical gravity gradient data to detect anomalies and estimate their depths and locations. First, the subsurface is divided into a 3D regular grid. Then, the probability tomography function is calculated at each grid node, and the obtained grid values are plotted. The zones of the highest values are the most probable areas for the buried bodies. It is noted that the results fall in the range [-1, +1] that represents the mass excess or mass deficit of density relative to the density of the host volume. The approach is applied to a sphere model and a cube model at certain flight altitudes. The results demonstrate that the approximate mass distribution and depth estimation derived from the approach are reliable up to a certain flight altitude.
DS1999-0740
1999
HanTompkins, L.A., Meyer, Han, Hu, Armstrong, TaylorPetrology and chemistry of kimberlites from Shandong and Liaoning Provinces7th International Kimberlite Conference Nixon, Vol. 2, pp. 872-87.China, Shandong, FuxianMineral chemistry, trace, multi, analyses, thermometry, Deposit - Mengyin, Fuxian
DS2001-0442
2001
Han, B-F.Han, B-F., Zheng, Y., Gan, J., Chang, Z.The Louzidian normal fault near Chifeng: master fault of a quasi metamorphic core complex.International Geology Review, Vol. 43, pp. 254-64.GlobalTectonics, Qinling Dabie Orogenic belt, ultra high pressure (UHP)
DS200612-0209
2006
Han, J.Y.Calasi, E., Han, J.Y., De Mets, C., Nocquet, J.M.Deformation of the North American plate interior from a decade of continuous GPS measurements.Journal of Geophysical Research, Vol. 111, B6, B06301.Canada, United StatesGeophysics - seismics
DS201805-0981
2018
Han, S.Sun, N., Wei, W., Han, S., Song, J., Li, X., Duan, Y., Prakapenka, V.B., Mao, Z.Phase transition and thermal equations of state of (Fe, Al) -bridgmanite and post perovskite: implication for the chemical heterogeneity at the lowermost mantle.Earth Planetary Science Letters, Vol. 490, pp. 161-169.Mantleperovskite
DS201901-0083
2018
Han, S.Sun, N., Wei, W., Han, S., Song, J., Li, X, Duan, Y., Prakapenka, V.B., Mao, Z.Phase transition and thermal equations of state of ( Fe, Al) - bridgmanite and post-perovskite: implication for the chemical heterogeneity at the lowermost mantle.Earth and Planetary Science Letters, Vol. 490, 1, pp. 161-169.Mantlegeothermometry

Abstract: In this study, we have determined the phase boundary between Mg0.735Fe0.21Al0.07Si0.965O3-Bm and PPv and the thermal equations of state of both phases up to 202 GPa and 2600 K using synchrotron X-ray diffraction in laser heated diamond anvil cells. Our experimental results have shown that the combined effect of Fe and Al produces a wide two-phase coexistence region with a thickness of 26 GPa (410 km) at 2200 K, and addition of Fe lowers the onset transition pressure to 98 GPa at 2000 K, consistent with previous experimental results. Furthermore, addition of Fe was noted to reduce the density (?) and bulk sound velocity () contrasts across the Bm-PPv phase transition, which is in contrast to the effect of Al. Using the obtained phase diagram and thermal equations of state of Bm and PPv, we have also examined the effect of composition variations on the ? and profiles of the lowermost mantle. Our modeling results have shown that the pyrolitic lowermost mantle should be highly heterogeneous in composition and temperature laterally to match the observed variations in the depth and seismic signatures of the D? discontinuity. Normal mantle in a pyrolitic composition with ?10% Fe and Al in Bm and PPv will lack clear seismic signature of the D? discontinuity because the broad phase boundary could smooth the velocity contrast between Bm and PPv. On the other hand, Fe-enriched regions close to the cold slabs may show a seismic signature with a change in the velocity slope of the D? discontinuity, consistent with recent seismic observations beneath the eastern Alaska. Only regions depleted in Fe and Al near the cold slabs would show a sharp change in velocity. Fe in such regions could be removed to the outer core by strong core-mantle interactions or partitions together with Al to the high-pressure phases in the subduction mid ocean ridge basalts. Our results thus have profound implication for the composition of the lowermost mantle.
DS202001-0037
2020
Han, T-S.Santosh, M., Tsunogae, T., Yang, C-X., Han, T-S., Hari, K.R., Prasanth, M.P.M., Uthup, S.The Bastar craton, central India: a window to Archean - Paleoproterozic crustal evolution.Gondwana Research, Vol. 79, pp. 157-184.Indiacraton

Abstract: The Bastar craton in central India, surrounded by cratonic blocks and Paleoproterozoic to Neoproterozoic orogenic belts, is a window to investigate the Archean-Paleoproterozoic crustal evolution and tectonic processes. Here we propose a new tectonic classification of the craton into the Western Bastar Craton (WBC), Eastern Bastar Craton (EBC), and the intervening Central Bastar Orogen (CBO). We present petrologic, geochemical and zircon U-Pb, REE and Lu-Hf data from a suite of rocks from the CBO and along the eastern margin of the WBC Including: (1) volcanic successions comprising meta-andesite and fine-grained amphibolite, representing arc-related volcanics along a convergent margin; (2) ferruginous sandstone, in association with rhyolite, representing a volcano-sedimentary succession, deposited in an active trench; and (3) metamorphosed mafic-ultramafic suite including gabbro, pyroxenite and dunite invaded by trondhjemite representing the section of sub-arc mantle and arc root adjacent to a long-lasting subduction system. Petrologic studies indicate that the mafic-ultramafic suite crystallized from an island arc tholeiitic parental magma in a suprasubduction zone environment. The chondrite-normalized and primitive mantle normalized diagrams of the mafic and ultramafic rocks suggest derivation from MORB magma. The mixed characters from N-MORB to E-MORB of the studied samples are consistent with subduction modification of a MORB related magma, involving partial melting of the metasomatized mantle wedge. Our zircon U-Pb age data suggest that the cratonic nuclei was constructed as early as Paleoarchean. We present evidence for active subduction and arc magmatism through Mesoarchean to Neoarchean and early Paleoproterozoic, with the trench remaining open until at least 2.3?Ga. Two major crust building events are recognized in the Bastar craton: during Mesoarchean (recycled Paleoarchean subduction-related as well as juvenile/depleted mantle components) and Neoarchean (accretion of juvenile oceanic crust, arc magmatism including granite batholiths and related porphyry mineralization). The final cratonization occurred during latest Paleoproterozoic, followed by collisional assembly of the craton and its incorporation within the Peninsular Indian mosaic during Mesoproterozoic. In the global supercontinent context, the craton preserves the history of Ur, the earliest supercontinent, followed by the Paleo-Mesoproterozoic Columbia, as well as minor thermal imprints of the Neoproterozoic Rodinia and associated Grenvillian orogeny.
DS1996-0856
1996
Han, Y.Liu, G., Han, Y., Wang, X., Miao, Q., Che, F.Carbon isotopic composition and genesis of diamond in ChinaInternational Geological Congress 30th Session Beijing, Abstracts, Vol. 2, p. 396.ChinaGeochronology, Deposit -Fuxian, Mengyin, Zhenyuan
DS200512-1201
2005
Han, Y.Wu, X., Meng, D., Han, Y.aPbO2 type nanophase TiO2 from coesite bearing eclogite in the Dabie Mountains, China.American Mineralogist, Vol. 90, July-August pp. 1458-1461.Asia, ChinaUHP - Coesite eclogite
DS201712-2727
2018
Han, Y-S.Santosh, M., Hari, K.R., He, X-F., Han, Y-S., Manu Prasanth, M.P.Oldest lamproites from Peninsular India track the onset of Paleoproterozoic plume induced rifting and the birth of Large Igneous Province.Gondwana Research, Vol. 55, pp. 1-20.Indialamproites - Nuapada

Abstract: Potassic and ultrapotassic magmatism from deep lithospheric sources in intra-cratonic settings can be the signal of subsequent voluminous mafic magmatism and the formation of Large Igneous Provinces (LIPs) triggered by mantle plumes. Here we report for the first time, precise zircon U-Pb age data from a suite of lamproites in the Bastar Craton of central India that mark the onset of Paleoproterozoic rifting and culminating in the formation of extensive mafic dyke swarms as the bar codes of one of the major LIP events during the Precambrian evolution of the Indian shield. The lamproites from the Nuapada field occur as dismembered dykes and are composed of phenocrysts and microphenocrysts of altered olivine together with microphenocrysts of phlogopite and magnetite within a groundmass of chlorite and calcite with accessory rutile, apatite and zircon. The rocks compositionally correspond to olivine phlogopite lamproite and phlogopite lamproite. Geochemical features of the lamproites correlate with their counterparts in Peninsular India and other similar suites elsewhere in the world related to rift settings, and also indicate OIB-like magma source. The associated syenite shows subduction-related features, possibly generated in a post-collisional setting. Magmatic zircon grains with high Th/U ratios in the syenite from the Nuapada lamproite form a coherent group with an upper intercept age of 2473 ± 8 Ma representing the timing of emplacement of the magma. Zircon grains in three lamproite samples yield four distinct age groups at ca. 2.4 Ga, 2.2 Ga, 2.0 Ga and 0.8 Ga. The 2.4 Ga group corresponds to xenocrysts entrained from the syenite whereas the 2.2 Ga group is considered to represent the timing of emplacement of the lamproites. The ca. 2.0 Ga zircon grains correlate with the major thermal imprint associated with mafic magmatism and dyke emplacement in southern Bastar and the adjacent Dharwar Cratons. A few young zircon grains in the syenite and lamproites show a range of early to middle Neoproterozoic ages from 879 to 651 Ma corresponding to younger thermal event(s) as also represented by granitic veins cutting across these rocks and extensive silicification. Zircon Lu-Hf isotope data suggest magma derivation from a refertilized Paleo-Mesoarchean sub-continental lithospheric mantle, or OIB-type sources. The differences in Hf-isotope composition among the zircon grains from different age groups indicate that the mantle sources of the lamproite are heterogeneous at the regional scale. A combination of the features from geochemical and zircon Hf isotope data is consistent with asthenosphere-lithosphere interaction during the lamproite magma evolution. The timing of lamproite emplacement in central India correlates with the global 2.2 Ga record of LIPs. We link the origin of the related mantle plume to the recycling of subducted slabs associated with the prolonged subduction-accretion history prior to the Neoarchean cratonization, as well as the thermal blanket effect of the Earth’s oldest supercontinent. Pulsating plumes and continued rifting generated voluminous dyke swarms across the Bastar and Dharwar Cratons, forming part of a major global rifting and LIP event.
DS201802-0262
2018
Han, Y-S.Santosh, M., Hari, K.R., He, X-F., Han, Y-S., Manu Prasanth, M.P.Oldest lamproites from Peninsular India track the onset of Paleoproterozoic plume induced rifting and the birth of Large Igneous Province.Gondwana Research, Vol. 55, pp. 1-20.Indialamproites

Abstract: Potassic and ultrapotassic magmatism from deep lithospheric sources in intra-cratonic settings can be the signal of subsequent voluminous mafic magmatism and the formation of Large Igneous Provinces (LIPs) triggered by mantle plumes. Here we report for the first time, precise zircon U-Pb age data from a suite of lamproites in the Bastar Craton of central India that mark the onset of Paleoproterozoic rifting and culminating in the formation of extensive mafic dyke swarms as the bar codes of one of the major LIP events during the Precambrian evolution of the Indian shield. The lamproites from the Nuapada field occur as dismembered dykes and are composed of phenocrysts and microphenocrysts of altered olivine together with microphenocrysts of phlogopite and magnetite within a groundmass of chlorite and calcite with accessory rutile, apatite and zircon. The rocks compositionally correspond to olivine phlogopite lamproite and phlogopite lamproite. Geochemical features of the lamproites correlate with their counterparts in Peninsular India and other similar suites elsewhere in the world related to rift settings, and also indicate OIB-like magma source. The associated syenite shows subduction-related features, possibly generated in a post-collisional setting. Magmatic zircon grains with high Th/U ratios in the syenite from the Nuapada lamproite form a coherent group with an upper intercept age of 2473 ± 8 Ma representing the timing of emplacement of the magma. Zircon grains in three lamproite samples yield four distinct age groups at ca. 2.4 Ga, 2.2 Ga, 2.0 Ga and 0.8 Ga. The 2.4 Ga group corresponds to xenocrysts entrained from the syenite whereas the 2.2 Ga group is considered to represent the timing of emplacement of the lamproites. The ca. 2.0 Ga zircon grains correlate with the major thermal imprint associated with mafic magmatism and dyke emplacement in southern Bastar and the adjacent Dharwar Cratons. A few young zircon grains in the syenite and lamproites show a range of early to middle Neoproterozoic ages from 879 to 651 Ma corresponding to younger thermal event(s) as also represented by granitic veins cutting across these rocks and extensive silicification. Zircon Lu-Hf isotope data suggest magma derivation from a refertilized Paleo-Mesoarchean sub-continental lithospheric mantle, or OIB-type sources. The differences in Hf-isotope composition among the zircon grains from different age groups indicate that the mantle sources of the lamproite are heterogeneous at the regional scale. A combination of the features from geochemical and zircon Hf isotope data is consistent with asthenosphere-lithosphere interaction during the lamproite magma evolution. The timing of lamproite emplacement in central India correlates with the global 2.2 Ga record of LIPs. We link the origin of the related mantle plume to the recycling of subducted slabs associated with the prolonged subduction-accretion history prior to the Neoarchean cratonization, as well as the thermal blanket effect of the Earth's oldest supercontinent. Pulsating plumes and continued rifting generated voluminous dyke swarms across the Bastar and Dharwar Cratons, forming part of a major global rifting and LIP event.
DS201903-0515
2019
Han, Y-S.Han, Y-S., Santosh, M., Ganguly, S., Li, S-S.Evolution of a Mesoarchean suprasubduction zone mantle wedge in the Dharwar Craton, southern India: evidence from petrology, geochemistry, zircon U-Pb geochronology, and Lu-Hf isotopes.Geological Journal, doi:10.1002/gj.3440Indiacraton

Abstract: Petrological, geochemical, and zircon U-Pb geochronological features of Archean ultramafic-mafic complexes formed in subduction?related settings provide significant insights into mantle source and geodynamic processes associated with subduction-accretion?collision events in the early Earth. Here, we investigate a suite of serpentinized dunite, dunite, pyroxenite, and clinopyroxenite from an ultramafic complex along the collisional suture between the Western Dharwar Craton (WDC) and the Central Dharwar Craton (CDC) in southern India. We present petrology, mineral chemistry, zircon U-Pb geochronology, rare earth element (REE), Lu-Hf isotopes, and whole?rock geochemistry including major, trace element, and platinum?group element (PGE) data with a view to investigate the magmatic and metasomatic processes in the subduction zone. Mineral chemistry data from chromite associated with the serpentinised ultramafic rocks show distinct characteristics of arc?related melt. Zircon U-Pb data from the ultramafic suite define different age populations, with the oldest ages at 2.9 Ga, and the dominant age population showing a range of 2.8-2.6 Ga. The early Paleoproterozoic (ca. 2.4 Ga) metamorphic age is considered to mark the timing of collision of the two WDC and CDC. Zircon REE patterns suggest the involvement continental crust components in the magma source. Zircon Lu-Hf analysis yields both positive and negative ?Hf(t) values from ?3.9 to 1.5 with Hf?depleted model ages (TDM) of 3,041-3,366 Ma for serpentinised dunite and ?0.2-2.0 and 2,833-2,995 Ma for pyroxenite, suggesting that the magma was sourced from depleted mantle and was contaminated with the ancient continental crust. Geochemical data show low MgO/SiO2 values and elevated Al2O3/TiO2 ratios, implying subduction?related setting. The serpentinized dunites and dunites show mild LREE enrichment over HREE, with relatively higher abundance of LILE (Ba, Sr) and depletion in HFSE (Nb, Zr), suggesting fluid-rock interaction, melt impregnation, and refertilization processes. The PGE data suggest olivine, chromite, and sulphide fractionations associated with subduction processes. Our study on the Mesoarchean to Neoarchean ultramafic complex provides important insights to reconstruct the history of the crust-mantle interaction in an Archean suprasubduction zone mantle wedge.
DS201911-2564
2019
Han, Y-S.Snatish, M., Tsunogae, T., Yang, C-X., Han, Y-S., Hari, K.R., Prasanth, M., Uthup, S.The Bastar craton, central India: a window to Archean-paleoproterozoic crustal evolution.Gondwana Research, in press available 69p. PdfIndiacraton

Abstract: The Bastar craton in central India, surrounded by cratonic blocks and Paleoproterozoic to Neoproterozoic orogenic belts, is a window to investigate the Archean-Paleoproterozoic crustal evolution and tectonic processes. Here we propose a new tectonic classification of the craton into the Western Bastar Craton (WBC), Eastern Bastar Craton (EBC), and the intervening Central Bastar Orogen (CBO). We present petrologic, geochemical and zircon U-Pb, REE and Lu-Hf data from a suite of rocks from the CBO and along the eastern margin of the WBC Including: (1) volcanic successions comprising meta-andesite and fine-grained amphibolite, representing arc-related volcanics along a convergent margin; (2) ferruginous sandstone, in association with rhyolite, representing a volcano-sedimentary succession, deposited in an active trench; and (3) metamorphosed mafic-ultramafic suite including gabbro, pyroxenite and dunite invaded by trondhjemite representing the section of sub-arc mantle and arc root adjacent to a long-lasting subduction system. Petrologic studies indicate that the mafic-ultramafic suite crystallized from an island arc tholeiitic parental magma in a suprasubduction zone environment. The chondrite-normalized and primitive mantle normalized diagrams of the mafic and ultramafic rocks suggest derivation from MORB magma. The mixed characters from N-MORB to E-MORB of the studied samples are consistent with subduction modification of a MORB related magma, involving partial melting of the metasomatized mantle wedge. Our zircon U-Pb age data suggest that the cratonic nuclei was constructed as early as Paleoarchean. We present evidence for active subduction and arc magmatism through Mesoarchean to Neoarchean and early Paleoproterozoic, with the trench remaining open until at least 2.3 Ga. Two major crust building events are recognized in the Bastar craton: during Mesoarchean (recycled Paleoarchean subduction-related as well as juvenile/depleted mantle components) and Neoarchean (accretion of juvenile oceanic crust, arc magmatism including granite batholiths and related porphyry mineralization). The final cratonization occurred during latest Paleoproterozoic, followed by collisional assembly of the craton and its incorporation within the Peninsular Indian mosaic during Mesoproterozoic. In the global supercontinent context, the craton preserves the history of Ur, the earliest supercontinent, followed by the Paleo-Mesoproterozoic Columbia, as well as minor thermal imprints of the Neoproterozoic Rodinia and associated Grenvillian orogeny.
DS202003-0361
2020
Han, Y-S.Santosh, M., Tsunogae, T., Yang, C-X., Han, Y-S., Hari, K.R., Manu Prasanth, M.P., Uthup, S.The Bastar craton, central India: a window to Archean - Paleoproterozoic crustal evolution.Gondwana Research, Vol. 79, pp. 157-184.Indiacraton

Abstract: The Bastar craton in central India, surrounded by cratonic blocks and Paleoproterozoic to Neoproterozoic orogenic belts, is a window to investigate the Archean-Paleoproterozoic crustal evolution and tectonic processes. Here we propose a new tectonic classification of the craton into the Western Bastar Craton (WBC), Eastern Bastar Craton (EBC), and the intervening Central Bastar Orogen (CBO). We present petrologic, geochemical and zircon U-Pb, REE and Lu-Hf data from a suite of rocks from the CBO and along the eastern margin of the WBC Including: (1) volcanic successions comprising meta-andesite and fine-grained amphibolite, representing arc-related volcanics along a convergent margin; (2) ferruginous sandstone, in association with rhyolite, representing a volcano-sedimentary succession, deposited in an active trench; and (3) metamorphosed mafic-ultramafic suite including gabbro, pyroxenite and dunite invaded by trondhjemite representing the section of sub-arc mantle and arc root adjacent to a long-lasting subduction system. Petrologic studies indicate that the mafic-ultramafic suite crystallized from an island arc tholeiitic parental magma in a suprasubduction zone environment. The chondrite-normalized and primitive mantle normalized diagrams of the mafic and ultramafic rocks suggest derivation from MORB magma. The mixed characters from N-MORB to E-MORB of the studied samples are consistent with subduction modification of a MORB related magma, involving partial melting of the metasomatized mantle wedge. Our zircon U-Pb age data suggest that the cratonic nuclei was constructed as early as Paleoarchean. We present evidence for active subduction and arc magmatism through Mesoarchean to Neoarchean and early Paleoproterozoic, with the trench remaining open until at least 2.3?Ga. Two major crust building events are recognized in the Bastar craton: during Mesoarchean (recycled Paleoarchean subduction-related as well as juvenile/depleted mantle components) and Neoarchean (accretion of juvenile oceanic crust, arc magmatism including granite batholiths and related porphyry mineralization). The final cratonization occurred during latest Paleoproterozoic, followed by collisional assembly of the craton and its incorporation within the Peninsular Indian mosaic during Mesoproterozoic. In the global supercontinent context, the craton preserves the history of Ur, the earliest supercontinent, followed by the Paleo-Mesoproterozoic Columbia, as well as minor thermal imprints of the Neoproterozoic Rodinia and associated Grenvillian orogeny.
DS1996-0590
1996
Han, Z.Han, Z.Concealed kimberlite bodies in Fuxian County, LiaoningInternational Geological Congress 30th Session Beijing, Abstracts, Vol. 2, p. 396.ChinaKimberlites, Deposit -Fuxian
DS1996-0837
1996
Han, Z.Leung, I.S., Taylor, L.A., Han, Z.SIC in diamond and kimberlites: implications for nucleation and growth ofdiamond.International Geology Review, Vol. 3, No. 7, July 1, pp. 595-606.GlobalDiamond morphology, SIC.
DS1998-1472
1998
Han, Z.Tompkins, L.A., Meyer, S.P., Han, Z., Hu, S.Petrology and geochemistry of kimberlites from Liaoning and ShandongProvinces, China.7th International Kimberlite Conference Abstract, pp. 917-9.China, Liaoning, ShandongChangma, comparison, Deposit - Fuxian, Mengyin
DS1995-1091
1995
Han, Z.G.Leung, S., Han, Z.G.A comparative study of SIC crystals from Kimberley and FuxianEos, Abstracts, Vol. 76, No. 17, Apr 25, p. S 155.South Africa, ChinaSIC mineralogy, Deposit -Kimberley, Fuxian
DS1990-1628
1990
Han ShaoxuZhao Lei, Han ShaoxuA new variety-chromian kennedyite in kimberlite from Shandong Province, ChinaInternational Mineralogical Association Meeting Held June, 1990 Beijing China, Vol. 2, extended abstract p. 717-718ChinaMineralogy, Kennedyite
DS1993-0367
1993
Han Zhuguo, H.Dong Zhenxin, Cong Andong, Han Zhuguo, H.Mineralogical criteria for determination of diamond content in kimberlites.*CHIMineral Deposits *CHI, Vol.12, No. 1, pp. 48-54ChinaMineral chemistry, Indicator minerals
DS1990-0647
1990
Han ZongzhuHan ZongzhuEclogites in ChinaInternational Mineralogical Association Meeting Held June, 1990 Beijing China, Vol. 2, extended abstract p. 852-853ChinaEclogites, Petrochemistry
DS1990-0648
1990
Han ZongzhuHan Zongzhu, Yuan Qilin, Sheng Xingtu, NI BangfaThe garnet in eclogite and garnet peridotite in Labieshan Mountain areaInternational Mineralogical Association Meeting Held June, 1990 Beijing, Vol. 2, extended abstract p. 854-855ChinaGarnet, Eclogites
DS200712-0408
2007
Hana, B.B.Hana, B.B., Blichert-Toft, J., Kingsley, R.H., Schilling, J-G.Source origin of the ultrapotassic lavas from the Leucite Hills, Wyoming: Hf isotope constraints.Plates, Plumes, and Paradigms, 1p. abstract p. A375.United States, Wyoming, Colorado PlateauLamproite
DS200712-0993
2006
Hana, B.B.Sinha, A.K., Lin, K., Hana, B.B., Shirey, S.B., Shervais, J.W., Seber, D.Informatics based discovery and integration of dat a towards understanding the fate of paleo-lithospheres for eastern North America.Geological Society of America Annual Meeting, Vol. 38, 7, Nov. p. 448. abstractUnited States, AppalachiaSCLM
DS201908-1790
2019
Hanafy, S.Lu, K., Hanafy, S., Stanstreet, I., Schuster, G.Seismic imaging of the Olduvai Basin, Tanzania.Paleogeography, Paleoclimatology, Paleoecology, 10.1016/j.palaeo .2019.109246Africa, Tanzaniageophysics - seismic

Abstract: A 5.6-km-long line of refraction and reflection seismic data spanning the Pliocene-Pleistocene fill of the Olduvai Basin, Tanzania is presented. The line is oriented along a northwest-southeast profile through the position of Olduvai Gorge Coring Project (OGCP) Borehole 2A. Our aims are to (1) delineate the geometry of the basin floor by tracing bedrock topography of the metaquartzitic and gneissic basement, (2) map synsedimentary normal faults and trace individual strata at depth, and (3) provide context for the sequence observed in OGCP cores. Results with refraction tomography and poststack migration show that the maximum basin depth is around 405?m (±25?m) in the deepest portion, which quadruples the thickness of the basin-fill previously known from outcrops. Variations in seismic velocities show the positions of lower density lake claystones and higher density well-cemented sedimentary sequences. The Bed I Basalt lava is a prominent marker in the refraction seismic results. Bottom-most sediments are dated to >2.2?Ma near where Borehole 2A bottoms out at the depth of 245?m. However, the seismic line shows that the basin-fill reaches a maximum stratigraphic thickness of around 380?m deep at Borehole 2A, in the western basin where the subsidence was greatest. This further suggests that potential hominin palaeoenvironments were available and preserved within the basin-fill possibly as far back as around 4?Ma, applying a temporal extrapolation using the average sediment accretion rate.
DS200412-0777
2004
Hanan, B.Hanan, B., Blichert-Toft, J., Pyle, D., Christie, D.Contrasting origins of the upper mantle MORB source revealed by Hf and Pb isotopes from the Australian Antarctic discordance.Geochimica et Cosmochimica Acta, 13th Goldschmidt Conference held Copenhagen Denmark, Vol. 68, 11 Supp. July, ABSTRACT p.A553.India, Australia, AntarcticaSubduction
DS201412-0753
2014
Hanan, B.Rooney, T.O., Nelson, W.R., Dosso, L., Furman, T., Hanan, B.The role of continental lithosphere metasomes in the production of HIMU-like magmatism on the northeast African and Arabian plates, East African Rift zone.Geology, Vol. 42, pp. 419-422.AfricaMagmatism
DS201702-0239
2017
Hanan, B.Rooney, T.O., Nelson, W.R., Ayalew, D., Hanan, B., Yirgu, G., Kappelman, J.Melting the lithosphere: metasomes as a source for mantle derived magmas.Earth and Planetary Science Letters, Vol. 461, pp. 105-118.MantleMetasomatism

Abstract: Peridotite constitutes most of the Earth's upper mantle, and it is therefore unsurprising that most mantle-derived magmas exhibit evidence of past equilibrium with an olivine-dominated source. Although there is mounting evidence for the role of pyroxenite in magma generation within upwelling mantle plumes, a less documented non-peridotite source of melts are metasomatic veins (metasomes) within the lithospheric mantle. Here we present major and trace element analyses of 66 lavas erupted from a small Miocene shield volcano located within the Ethiopian flood basalt province. Erupted lavas are intercalated with lahars and pyroclastic horizons that are overlain by a later stage of activity manifested in small cinder cones and flows. The lavas form two distinctive petrographic and geochemical groups: (A) an olivine-phyric, low Ti group (1.7-2.7 wt.% TiO2; 4.0-13.6 wt.% MgO), which geochemically resembles most of the basalts in the region. These low Ti lavas are the only geochemical units identified in the later cinder cones and associated lava flows; (B) a clinopyroxene-phyric high Ti group (3.1-6.5 wt.% TiO2; 2.8-9.2 wt.% MgO), which resembles the Oligocene HT-2 flood basalts. This unit is found intercalated with low Ti lavas within the Miocene shield. In comparison to the low Ti group, the high Ti lavas exhibit a profound depletion in Ni, Cr, Al, and Si, and significant enrichment in Ca, Fe, V, and the most incompatible trace elements. A characteristic negative K anomaly in primitive-mantle normalized diagrams, and Na2O > K2O, suggests a source rich in amphibole, devoid of olivine, and perhaps containing some carbonate and magnetite. While melt generation during rift development in Ethiopia is strongly correlated with the thermo-chemical anomalies associated with the African Superplume, thermobaric destabilization and melting of mantle metasomes may also contribute to lithospheric thinning. In regions impacted by mantle plumes, such melts may be critical to weakening of the continental lithosphere and the development of rifts.
DS200512-0396
2004
Hanan, B.B.Hanan, B.B., Blichert Toft, J., Pyle, D.G., Christie, D.M.Contrasting origins of the upper mantle revealed by hafnium and lead isotopes from southeast Indian Ridge ( corrigendum).Nature, No. 7017, Dec. 2, pp. 653-654.Mantle, IndiaGeochronology
DS200812-0586
2008
Hanan, B.B.Konter, J.C., Hanan, B.B., Blichert-Toft, J., Koppers, A.A.P., Plank, T., Staudigel, H.One hundred million years of mantle geochemical history suggest the retiring of mantle plumes is premature.Earth and Planetary Science Letters, Vol. 275, 3-4, pp. 285-295.MantleMagmatism
DS201212-0516
2012
Hanan, B.B.Nelson, W.R., Furman, T., Van Keken, P.E., Shirey, S.B., Hanan, B.B.Os Hf isotopic insight into mantle plume dynamics beneath the East African Rift system.Chemical Geology, Vol. 320-321 pp. 66-79.Africa, KenyaPicrite
DS201412-0310
2014
Hanan, B.B.Graham, D.W., Hanan, B.B., Hemond, C., Blichert-Toft, J., Albarede, F.Helium isotopic textures in Earth's upper mantle.Geochemistry, Geophysics, Geosystems: G3, Vol. 15, no. 5, pp. 2048-2074.MantleHelium
DS200512-0397
2004
Hanan, N.B.Hanan, N.B., Blichert Toft, J., Pyle, D.G., Christie, D.M.Contrasting origins of the upper mantle revealed by hafnium and lead isotopes from the southeast Indian Ridge.Nature, No. 7613, Nov. 4, pp. 91-93.Indian RidgeGeochronology
DS200712-1035
2006
Hanchar, D.Stea, R., Hanchar, D., Johnson, M.Glacial mapping as an aid to diamond exploration.34th Yellowknife Geoscience Forum, p. 104. abstractCanada, NunavutTahera - till sampling
DS201012-0754
2009
Hanchar, D.Stea, R.R., Johnson, M., Hanchar, D.The geometry of kimberlite indicator mineral dispersal fans in Nunavut, Canada.Geological Association of Canada Short Course, No. 18, pp. 1-14.Canada, NunavutGeomorphology, geochemistry
DS1994-0704
1994
Hanchar, J.M.Hanchar, J.M., Miller, C.F., Wooden, J.L., Bennett, StaudeEvidence from xenoliths for a dynamic lower crust eastern Mojave desert, California.Journal of Petrology, Vol. 35, pt. 5, pp. 1377-1415.CaliforniaXenoliths
DS1995-0737
1995
Hanchar, J.M.Hanchar, J.M., Rudinick, R.L.Revealing hidden structures: the application of cathodluminescence and back scattered electron imagingLithos, Vol. 36, No. 3/4, Dec. 1, pp. 289-GlobalZircons, lower crustal xenoliths, Spectrometry
DS200712-0409
2007
Hanchar, J.M.Hanchar, J.M., van Westrenen, W.Rare earth element behaviour in zircon melt systems.Elements, Vol. 3, 1, Feb. pp.37-42.MantleMelting
DS201312-0636
2013
Hanchar, J.M.Nasdala, L., Gotze, J., Hanchar, J.M.Luminescence spectroscopy and imaging: analytical advances and perspectives in the Earth Sciences and related disciplines.Mineralogy and Petrology, Vol. 107, 3, pp. 349-351.TechnologySpectroscopy
DS201802-0277
2017
Hanchar, J.M.Villa, I.M., Hanchar, J.M.Age discordance and mineralogy.American Mineralogist, Vol. 102, pp. 2422-2439.Technologygeochronology

Abstract: Observations of discordant ages, meaning that an age given by one mineral geochronometer is different from the age given by another geochronometer from the same rock, began in the early days of geochronology. In the late 1950s and 1960s, discordant U-Pb zircon ages were unquestioningly attributed to Pb diffusion at high temperature. Later, the mineralogical properties and the petrogenesis of the zircon crystals being dated was recognized as a key factor in obtaining concordant U-Pb ages. Advances in analytical methods allowed the analysis of smaller and smaller zircon multigrain fractions, then the analysis of individual grains, and even pieces of grains, with higher degrees of concordancy. Further advances allowed a higher analytical precision, a clearer perception of accuracy, and a better statistical resolution of age discordance. As for understanding the cause(s) of discordance, belief revision followed the coupling of imaging, cathodoluminescence (CL), and backscattered electrons (BSE), to in situ dating by secondary ion mass spectrometry (SIMS) or by laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS). Discordant zircon and other accessory minerals (e.g., monazite, apatite, etc.) often consist of young rims accreted onto/into older cores. Age gradients are sharp, and no Pb diffusion gradients are observed. As U-Pb discordance in crystalline, non-radiation damaged grains is caused by diachronous, heterochemical mineral generations, interpretations of mineral ages, based on the exclusive role of diffusion, are superseded, and closure temperatures of zircon and monazite are irrelevant in geological reality. Other isotopic systems (Rb-Sr, K-Ar) were believed, since the 1960s, to be similarly controlled by the diffusivity of radiogenic daughters. When zircon and monazite discordance were recognized as zone accretion/reaction with sharp boundaries that showed little or no high-temperature diffusive re-equilibration, the other chronometric systems were left behind, and interpretations of mineral ages based on the exclusive role of diffusion survived. The evidence from textural-petrologic imaging (CL, BSE) and element mapping by electron probe microanalyzer (EPMA) or high spatial resolution SIMS or LA-ICP-MS provides the decisive constraints. All microcline and mica geochronometers that have been characterized in detail document patchy textures and evidence for mineral replacement reactions. It is important not to confuse causes and effects; hetero-chemical microstructures are not the cause of Ar and Sr loss; rather, they follow it. Ar and Sr loss by dissolution of the older mineral generation occurs first, heterochemical textures form later, when the replacive assemblage recrystallizes. Heterochemical mineral generations are identified and dated by their Ca/Cl/K systematics in 39Ar-40Ar. Replacive reactions adding or removing Cl, such as, e.g., sericite overgrowths on K-feldspar, retrograde muscovite intergrowths with phengite, etc. are detected by Cl/K vs. Ar/K isotope correlation diagrams. Ca-poor reaction products, such as, e.g., young biotite intergrown with older amphibole, adularia replacing microcline, etc., can be easily identified by Ca/K vs. Ar/K diagrams supported by EPMA analyses. Mixed mineral generations are observed to be the cause of discordant, staircase-shaped age spectra, while step-heating of crystals with age gradients produces concordant plateaus. Age gradients are therefore unrelated to staircase age spectra. There is a profound analogy between the U-Pb, Rb-Sr, and K-Ar systems. Pb and Ar diffusion rates are both much slower than mineral replacement rates for all T < 750 °C. Patchy retrogression textures are always associated with heterochemical signatures (U/Th ratios, REE patterns, Ca/Cl/K ratios). As a rule, single-generation minerals with low amounts of radiation damage give concordant ages, whereas discordance is caused by mixtures of heterochemical, resolvably diachronous, mineral generations in petrologic disequilibrium. This can also include (sub-)grains that have accumulated significant amounts of radiation damage. For accurate geochronology the petrologic characterization with the appropriate technique(s) of the minerals to be dated, and the petrologic context at large, are as essential as the mass spectrometric analyses.
DS1993-0624
1993
Hancher, J.M.Hancher, J.M., Miller, C.F.Zircon zonation patterns as revealed by cathodluminescence and back scattered electron images: implications for interpretation of complex crustalhistoriesChemical Geology, Vol. 110, No. 1/3, November 25, pp. 1-14GlobalAlteration, Zircon
DS200912-0244
2009
Hancher, J.M.Gerdes, A., Kemp, A.L.S., Hancher, J.M., Schersten, A.Accessory minerals as tracers of crustal processes.Chemical Geology, Vol. 261, 3-4, April 30, pp. 197-198/MantleMineral chemistry
DS1993-0625
1993
Hancock, B.Hancock, B.Diamond ore treatment at Poseidon Bow River Diamond Mine LimitedAustralia Min. Met. Mawby Memorial Volume, Mon. 19, pp. 1464-1467.AustraliaMining, Deposit -Bow River
DS1994-0705
1994
Hancock, G.E.Hancock, G.E., Gillies, A.D.S.Issues in Australasian mining taxation: the arguments for and against resource rent taxationAustralian Institute of Mining and Metallurgy (AusIMM) Bulletin, No. 4, July pp. 11, 13-17AustraliaLegal, Mining taxation
DS200412-0778
2004
Hancock, G.R.Hancock, G.R.The use of Lands cape evolution models in mining rehabilitation design.Environmental Geology, Vol. 46, 5, pp. 561-574.GlobalEnvironment - not specific to diamonds
DS1995-0738
1995
Hancock, J.B.Hancock, J.B.General economicsProspectors and Developers Association of Canada (PDAC) Short Course, March 4, pp. 171-179GlobalDue diligence, Economics -ore reserves
DS1992-1020
1992
Hancock, J.M.McArthur, J.M., Burnett, J., Hancock, J.M.Strontium isotopes at K/T boundaryNature, Vol. 355, No. 6355, January 2, p.28GlobalBoundary, Geochronology
DS1988-0289
1988
Hancock, K.D.Hancock, K.D.Ultramafic associated magnetite depositsBritish Columbia Ministry of Energy Mines and Petroleum Resources, Open File, No. 1988-28, pp. 121-127British ColumbiaTulameen, Ultramafic
DS1991-0655
1991
Hancock, K.D.Hancock, K.D.Ultramafic associated chromite and nickel occurrences in British ColumbiaBritish Columbia Ministry of Energy Mines and Petroleum Resources, Open file No. 1990-27, 62p. $ 12.00British ColumbiaNickel, Chromite
DS1991-0656
1991
Hancock, K.D.Hancock, K.D., Hora, Z.D., White, G.V.Olivine potential of the Tulameen ultramafic Complex (NTS 092H/10)British Columbia Ministry of Energy Mines and Resources, Open File, No. 1991-9, 19pBritish ColumbiaUltramafic, Olivine
DS1994-0706
1994
Hancock, P.L.Hancock, P.L.Continental deformationPergamon Press, 420pGlobalDeformation styles, Book -table of contents
DS1995-0739
1995
Hancock, P.M.Hancock, P.M.Where is Australia's policy on mineral resourcesAustralian Institute of Mining and Metallurgy (AusIMM) Bulletin, No. 1, Feb, pp. 10-12AustraliaLegal, Economics -mineral policy
DS1992-0915
1992
Hancock, R.G.Lawrence, M.J., Hancock, R.G., Dewar, G.J.A.New due diligence requirements affecting technical experts contributing to prospectuses involving resource assetsAustralian Institute of Mining and Metallurgy (AusIMM) Bulletin, No. 4, July pp. 34-35, 37-38AustraliaGeostatistics, Ore reserves, due diligence
DS1982-0246
1982
Hancock, S.L.Hancock, S.L., Western mining corp. ltd.El 2786 Swan Yard Terminal Report 1982Northern Territory Geological Survey Open File Report, No. CR 82/386, 3P.Australia, Northern TerritoryProspecting, Sampling, Geochemistry, Photogeology
DS201412-0337
2014
Hand, E.Hand, E.All eyes on shooting stars.Science, Vol. 345, 6203, Sept. 19, pp. 1437-8.Meteorite
DS201510-1772
2015
Hand, E.Hand, E.Mantle plumes seen rising from Earth's core.Science, Vol. 349, 6252, pp. 1032-1033.MantlePlume

Abstract: Mantle plumes, tubes of hot rock rising from Earth's core, have come into focus, ending a more than 40-year-long debate. The result comes from a sophisticated MRI-like tomographic model that used 273 large earthquakes to illuminate the interior of Earth. It revealed as many as 28 plumes, many of them underneath known volcanic hot spots at Earth's surface. The plumes are fatter than expected, which means that they carry more heat away from Earth's core, an indication that plumes are important for cooling the planet. The model also shows that the plumes bend at a depth of 1000 kilometers, which could indicate an undiscovered mineral phase transition in the lower mantle that makes it less stiff.
DS201512-1925
2015
Hand, E.Hand, E.How buried water makes diamonds and oils.Science, Vol. 350, 6261, pp. 613-614.TechnologyDiamond genesis

Abstract: Under high pressures, water can react with surrounding rock to make diamonds and oil. These are just two consequences of a new picture of water's versatile chemistry in the mantle. The Deep Earth Water model is showing that, under extreme pressures down to 200 kilometers, water can dissolve many ions and host unexpected new reactions. It is replacing a geochemical framework, published in 1981, which made predictions for water-rock interactions, but only down to 15 kilometers. The idea that oil can be made from water and rock in the mantle is controversial, because it has long been assumed that oil arises through the compaction and burial of organic matter.
DS201910-2263
2019
Hand, E.Hand, E.World's oldest impact crater dated in Australian outback. YarrabubbaScience, Vol. 365, 6456, pp. 852-853.Australiaimpact crater

Abstract: In the outback of Western Australia, researchers have shown that shocked rocks were forged 2.229 billion years ago, when an asteroid crashed into our planet. The finding makes Yarrabubba crater, the 70-kilometer-wide scar left by the collision, Earth's oldest. The geologists who reported the date last week, at the Goldschmidt geochemistry conference, also point out a conspicuous coincidence: The impact came at the tail end of a planetwide deep freeze known as Snowball Earth. They say the impact may have helped thaw Earth by vaporizing thick ice sheets and lofting steam into the stratosphere, creating a powerful greenhouse effect. Other researchers are skeptical that Yarrabubba—which is just one-third the size of the crater left by the dinosaur-killing impact 66 million years ago—could have had such a profound effect on the climate. Still, they say, paleoclimate studies should consider the possible role of such violent collisions.
DS2000-0533
2000
Hand, J.Krapez, B., Brown, S.J.A., Hand, J., Barley, M., Cas, R.Age constraints on recycled crustal and supracrustal sources of Archean metasedimentary sequences.Tectonophysics, Vol. 322, No. 1-2, pp.89-133.Australia, Eastern GoldfieldsGeochronology, Subduction
DS1992-0660
1992
Hand, M.Hand, M., Dirks, P.H.G.M., Powell, R., Buick, I.S.How well established is isobaric cooling in Proterozoic orogenic belts? an example from the Arunta inlierGeology, Vol. 20, No. 7, July pp. 649-652Australiametamorphism, Proterozoic belts
DS1994-0707
1994
Hand, M.Hand, M., Scrimgeour, I., Stuwe, K., Arne, D., Wilson, C.J.Geological observations in high grade mid-Proterozoic rocks from ElsePlatform, Prince Charles Mtns. regionAustralian Journal of Earth Sciences, Vol. 41, pp. 311-329AntarcticaTectonics, Proterozoic
DS2001-0775
2001
Hand, M.Miller, J., Holdsworth, R., Buick, L., Hand, M.Continental reactivation and reworkingGeological Society of London, No. 184, 450p. approx. $ 142.00GlobalBook - ad, Structure, faulting, Tectonics, crust, lithosphere
DS2001-0776
2001
Hand, M.Miller, J.A., Holdsworth, R.E., Buick, I.S., Hand, M.Continental reactivation and reworkingGeological Society of London, No. 184, 400p.GlobalBook - table of contents, Tectonics - basement orogeny
DS2001-1009
2001
Hand, M.Sandiford, M., Hand, M., McLaren, S.Tectonic feedback, intraplate orogeny and the geochemical structure of the crust: central perspectiveGeological Society of London, Special Publication, Special Paper 184, pp. 195-218.AustraliaTectonics
DS2003-0485
2003
Hand, M.Goscombe, B., Hand, M., Gray, D., Mawby, J.Metamorphic architecture of a transpressional orogen: the Kaoko belt, NamibiaJournal of Petrology, Vol. 44, 4, pp. 679-712.NamibiaTectonics
DS2003-0486
2003
Hand, M.Goscombe, B., Hand, M., Gray, D.Structure of the Kaoko Belt, Namibia: progressive evolution of a classic transpressionalJournal of Structural Geology, Vol. 25, 7, pp. 1049-81.NamibiaTectonics
DS200412-0698
2003
Hand, M.Goscombe, B., Hand, M.,Gray, D., Mawby, J.Metamorphic architecture of a transpressional orogen: the Kaoko belt, Namibia.Journal of Petrology, Vol. 44, 4, pp. 679-712.Africa, NamibiaTectonics
DS200412-0699
2003
Hand, M.Goscombe, B., Hand, M., Gray, D.Structure of the Kaoko Belt, Namibia: progressive evolution of a classic transpressional orogen.Journal of Structural Geology, Vol. 25, 7, pp. 1049-81.Africa, NamibiaTectonics
DS200412-1276
2004
Hand, M.McLaren, S., Sandiford, M., Hand, M., Neumann, N., Wyborn, L.,Bastrkova, I.The hot southern continent: heat flow and heat production in Australian Proterozoic terranes.Hillis, R.R., Muller, R.D. Evolution and dynamics of the Australian Plate, Geological Society America Memoir, No. 372, pp. 157-168.AustraliaGeothermometry
DS200612-1398
2005
Hand, M.Swain, G., Woodhouse, A., Hand, M., Barovich, K., Schwarz, M., Fanning, C.M.Provenance and tectonic development of the late Archean Gawler Craton, Australia: U Pb zircon, geochemical and Sm Nd isotopic implications.Precambrian Research, Vol. 141, 3-4, pp. 106-136.AustraliaGeochronology
DS200712-0190
2007
Hand, M.Clark, C., Hand, M., Kelsey, D.E., Goscombe, B.Linking crustal reworking to terrane accretion.Journal of Geological Society of London, Vol. 164, 5, pp. 937-940.MantleAccretion
DS200712-0919
2007
Hand, M.Rutherford, L., Hand, M., Barovich, K.Timing of Proterozoic metamorphism in the southern Cumamona Province: implications for tectonic models and continental reconstructions.Australian Journal of Earth Sciences, Vol. 54, 1, pp. 65-81.AustraliaTectonics
DS201312-0948
2013
Hand, M.Walsh, A., Hand, M., Collins, A., Brick, R.World's oldest eclogites? Phase equilibration temperatures constraints on 2 Ga metaleitic hosted eclogites frm the Usagaran orogen, Tanzania.Goldschmidt 2013, 1p. AbstractAfrica, TanzaniaEclogite
DS201412-0720
2013
Hand, M.Raimondo, T., Hand, M., Collins, W.J.Compressional intracontinental orogens: ancient and modern perspectives.Earth Science Reviews, Vol. 130, pp. 128-153.MantleGeodynamics
DS202010-1830
2020
Hand, M.Brown, D.A., Tamblyn, R., Hand, M., Morrissey, L.J.Thermobarometric constraints on burial and exhumation of 2 billion year old eclogites and their metapelitic hosts.Precambrian Research, Vol. 347, 105833, 33p. PdfAfrica, Tanzaniaeclogites

Abstract: One of the first appearances of eclogite-facies mineral assemblages in the geological record occurs in the c. 2000 Ma Palaeoproterozoic Usagaran Belt in central Tanzania, where the extended margin of the Tanzanian Craton is interpreted to have been subducted. Mafic rocks are interpreted to have contained the mineral assemblage garnet + omphacite + rutile + quartz ± amphibole. This high-pressure assemblage has been overprinted by a secondary mineral assemblage containing clinopyroxene + plagioclase + hornblende + ilmenite ± orthopyroxene. Mineral equilibria forward modelling indicates that the eclogite-facies assemblages reached minimum peak pressure-temperature (P-T) conditions of ~17 kbar and ~700 °C. Inclusions in garnet document a prograde P-T history consistent with burial through upper amphibolite-facies conditions and possible partial melting. Petrological and compositional evidence from garnet suggests that following peak metamorphism, the eclogite-facies rocks were heated while stalled at approximate peak pressures. Temperature estimates derived from Zr concentrations in interpreted texturally retrograde rutile support a near-isothermal post-peak P-T evolution for the eclogite-facies rocks - an evolution that terminates at retrograde P-T conditions of approximately 7.6-8.2 kbar and 680-790 °C. The relict eclogite domains form part of a larger assemblage with enclosing migmatitic metapelitic lithologies (the Isimani Suite). The metapelitic gneisses contain garnet + kyanite + biotite + staurolite + hornblende + plagioclase + muscovite + rutile + quartz and preserve minimal evidence of a high-pressure history, conceivably due to post-peak mineralogical recrystallisation. P-T modelling, inclusion assemblages and compositional zonation patterns in porphyroblastic garnet suggests the metapelitic gneisses — similarly to the relict eclogites — experienced burial to minimum peak pressures of approximately 16.5-17 kbar. Compositional zoning patterns in eclogitic garnet suggest the Isimani system was buried, reached peak metamorphic conditions, and was subsequently exhumed within a timeframe of up to 20 Myr. A tectonic regime involving crustal thickening and subduction, followed by extensional exhumation of the entire Isimani Suite is our preferred model for the development of the c. 2000 Ma Usagaran Belt.
DS202201-0043
2022
Hand, M.Tamblyn, R., Hasterok, D., Hand, M. , Gard, M.Mantle heating at ca. 2 Ga by continental insulation: evidence from granites and eclogites ** not specific to diamonds.Geology, Vol. 50, 1 pp. 91-95.Mantlethermometry
DS202202-0218
2022
Hand, M.Tamblyn, R., Hasterok, D., Hand, M., Gard, M.Mantle heating at ca 2 Ga by continental insulation: evidence from granites and eclogites.Geology, Vol. 50, 1, pp. 91-96.Mantleeclogites

Abstract: Igneous and metamorphic rocks contain the mineralogical and geochemical record of thermally driven processes on Earth. The generally accepted thermal budget of the mantle indicates a steady cooling trend since the Archean. The geological record, however, indicates this simple cooling model may not hold true. Subduction-related eclogites substantially emerge in the rock record from 2.1 Ga to 1.8 Ga, indicating that average mantle thermal conditions cooled below a critical threshold for widespread eclogite preservation. Following this period, eclogite disappeared again until ca. 1.1 Ga. Coincident with the transient emergence of eclogite, global granite chemistry recorded a decrease in Sr and Eu and increases in yttrium and heavy rare earth element (HREE) concentrations. These changes are most simply explained by warming of the thermal regime associated with granite genesis. We suggest that warming was caused by increased continental insulation of the mantle at this time. Ultimately, secular cooling of the mantle overcame insulation, allowing the second emergence and preservation of eclogite from ca. 1.1 Ga until present.
DS1998-0571
1998
Handa, S.Handa, S., Camfield, P.A.Crustal electrical conductivity in north central Saskatchewan: the North American Central Plains anomaly and its relation to a Proterozoic plate margin.Canadian Journal of Earth Sciences, Vol. 21, pp. 533-43.SaskatchewanGeophysics - magnetics, Shield, Wollaston Domain
DS1989-1452
1989
Handcock, M.S.Stein, M.L., Handcock, M.S.Some asymptotic properties of kriging when the covariance function ismisspecifiedMathematical Geology, Vol. 21, No. 2, February pp. 171-190. Database # 17773GlobalGeostatistics, Kriging -covariance function
DS1991-0657
1991
Handelsman, S.D.Handelsman, S.D., Gemerts, G.Conference report on United Nations inter regional seminar on computerized mineral title management and associated databasesNatural Resources forum, August pp. 235-238GlobalDatabases, Economics -mineral titles
DS1997-0470
1997
Handelsman, S.D.Handelsman, S.D.Assessing country risk for mining investment17th. World Mining Congress Oct. Mexico, pp. 499-508GlobalEconomics, Country risk, valuation
DS1999-0746
1999
Handke, Hamilton et al.Tucker, R.D., Ashwal, L.D., Handke, Hamilton et al.Uranium-lead (U-Pb) geochronology and isotope geochemistry of the Archean and Proterozoic rocks north central MadagascarJournal of Geology, Vol. 107, No. 2, Mar. pp. 135-54.MadagascarGeochronology
DS1999-0285
1999
Handke, M.J.Handke, M.J., Tucker, R.D., Ashwal, L.D.Neoproterozoic continental arc magmatism in west central MadagascarGeology, Vol. 27, No. 4, Apr pp. 351-4.MadagascarRodinia, Gondwana, Geochronology, magma - not specific to diamonds
DS2000-0383
2000
Handke, M.J.Handke, M.J., Tucker, R.D.A middle Neoproterozoic appinite suite in west central Madagascar: high Ba Sr magmatism related to Rodinia....Geological Society of America (GSA) Abstracts, Vol. 32, No. 7, p.A-436.MadagascarMagmatism - not specific to diamonds
DS1996-0591
1996
Handler, M.Handler, M.Rhenium osmium isotopic constraints on timing of melt extraction events and evolution lithospheric mantleGeological Society of Australia 13th. Convention held Feb., No. 41, abstracts p.180.MantleContinental lithospheric mantle CLM.
DS1997-0471
1997
Handler, M.R.Handler, M.R., Bennett, V.C., Esat, T.M.The persistence of off cratonic lithospheric mantle: Os isotopic systematics variably metasomatised xenolithsEarth and Planetary Science Letters, Vol. 151, pp. 61-75.Australia, SoutheastXenoliths, Craton, geochronology
DS1999-0286
1999
Handler, M.R.Handler, M.R., Bennett, V.C., Dreibus, G.Evidence from correlated Ir Os and copper S for late stage mobility inperidotite xenoliths: implications Rhenium- Osmium (Re-Os)Geology, Vol. 27, No. 1, Jan. pp. 75-78.Australia, mantleXenoliths, Geochemistry
DS2003-0546
2003
Handler, M.R.Handler, M.R., Wysoczanski, R.J., Gamble, J.A.Proterozoic lithosphere in Marie Byrd Land, West Antarctica: Re Os systematics ofChemical Geology, Vol. 196, 1-4, pp. 131-45.AntarcticaGeochronology, Xenoliths
DS200412-0779
2003
Handler, M.R.Handler, M.R., Wysoczanski, R.J., Gamble, J.A.Proterozoic lithosphere in Marie Byrd Land, West Antarctica: Re Os systematics of spinel peridotite xenoliths.Chemical Geology, Vol. 196, 1-4, pp. 131-45.AntarcticaGeochronology Xenoliths
DS200812-0446
2008
Handler, M.R.Handler, M.R., Baker, J.A., Schiller, M., Bennett, V.C., Yaxley, G.M.Stable Mg isotope composition of Earth's mantle,Goldschmidt Conference 2008, Abstract p.A348.MantleGeochronology
DS2001-1113
2001
Handler, R.Spikings, R.A., Winkler, W., Seward, D., Handler, R.Along strike variations in the thermal and tectonic response of the continental Ecuadorian Andes- collisionEarth and Planetary Science Letters, Vol. 186, No. 1, Mar. 15, pp. 57-73.Andes, EcuadorTectonics, Geothermometry
DS1994-0708
1994
Handlesman, S.D.Handlesman, S.D.United Nations mineral sector activities in AfricaRidgeway Partners Preprint, 8pAfricaEconomics, United Nations overview of mining
DS201112-0561
2011
HandleyKurbatov, A.V., Mayewski, P.A., Steffensen, J.P., West, A., Kennett, Bunch, Handley, Introne, Shane, Mercer etcDiscovery of a nanodiamond rich layer in the Greenland ice sheet.Journal of Glaciology, Vol. 56, no. 199, pp. 747-757.Europe, GreenlandGeomorphology
DS1900-0252
1904
Handmann, P.R.Handmann, P.R.Der Diamant, 1904Natur Und Kultur., BD. 1, PP. 202-206; PP. 242-247.Africa, South AfricaDiamond Morphology
DS1900-0322
1905
Handmann, P.R.Handmann, P.R.Der Diamant, das Vorkommen und die Entstehung Sowie die Kunstliche Erzeugung des Diamants.Natur Und Kultur, Zeitschr. Fur Schule Und Leben., JAHR. 2, PP. 486-488.GlobalGeology, Diamond Occurrences, Diamond Genesis, Synthesis
DS1900-0411
1906
Handmann, P.R.Handmann, P.R., Kuftos, S.J.Die KapdiamantenNatur Und Kultur, Zeitschr. Fur Schule Und Leben., JAHR. 3, HEFT 14, APRIL 15TH. PP. 417-421; HEFT 15, MAY 1ST.Africa, South AfricaHistory
DS1900-0665
1908
Handmann, P.R.Handmann, P.R.Die Mineralogische Zusammensetzung der Sued afrikanische Blue Ground Masse.Zentrall Bl. Min.(stuttgart), BD. 2, PP. 186-182.Africa, South AfricaMineralogy, Kimberlite Mines And Deposits
DS1900-0755
1909
Handmann, P.R.Handmann, P.R.Entstehungsweise und Kuenstliche Herstellung des DiamantenNatur Und Kultur., BD. 6, PP. 268-272.; P. 297.; P. 301.Africa, South AfricaDiamond Morphology
DS200412-2023
2004
Handong, T.Unsworth, M., Wenbo, W., Jones, A.G., Li, S., Bedrosian, P., Booker, J., Sheng, J., Ming, D., Handong, T.Crustal and upper mantle structure of northern Tibet imaged with magnetotelluric data.Journal of Geophysical Research, Vol. 109, B2, Feb. 13, 10.1029/2002 JB002305Asia, TibetTectonics, geophysics - seismics
DS1990-0649
1990
Handy, M.R.Handy, M.R.A basic tectonic problem the exhumation of coherent sections of continentalcrustTerra, Abstracts of Crustal Dynamics: Pathways and Records held Bochum FRG, Vol. 2, December p. 1GlobalCrust, Tectonics
DS2002-0649
2002
Handy, M.R.Handy, M.R., Stunitz, H.Strain localization by fracturing and reaction weakening -a mechanism for initiating exhumation of subcontinetal mantle beneath rifted margins.Geological Society of London Special Publication, No.200, pp. 387-408.MantleStructure, rifting
DS200412-0780
2004
Handy, M.R.Handy, M.R., Brun, J-P.Seismicity, structure and strength of the continental lithosphere.Earth and Planetary Science Letters, Vol. 223, 3-4, July, 15, pp. 427-441.MantleRheology
DS1995-0740
1995
Haner, B.Haner, B., O'Donnell, J.Changing gateways: the impact of technology on Geoscience informationexchangeProceedings 29th. GIS Volume, No. 25, 120pUnited StatesBook -information technology, Table of contents
DS201012-0236
2010
Hanes, J.Gladkochub, D.P., Pisarevsky, S.A., Ernst, R., Donskaya, T.V., Soderlund, U., Mazukabzov, A.M., Hanes, J.Large igneous province of about 1750 Ma in the Siberian Craton.Doklady Earth Sciences, Vol. 430, 2, pp. 163-167.RussiaMagmatism
DS1985-0261
1985
Hanes, J.A.Hanes, J.A., York, D., Hall, C.M.An 40 Ar-39 Ar geochronological and electron microprobe investigation of an Archean pyroxenite and its bearing on ancient atmospheric compositions.Canadian Journal of Earth Sciences, Vol. 22, pp. 947-58.MantleUltramafic Rocks - Not Specific To Diamonds, Argon, Geochronology
DS1986-0338
1986
Hanes, J.A.Hanes, J.A., Archibald, D.A., Lee, J.K.W.Reconnaissance 40 Ar-39 Ar geochronology of Kapuskasing,Matachewan and Hearst diabase dikes in the Kapuskasing structural zone and adjacent AbitibiGeological Association of Canada (GAC) Annual Meeting, Vol. 11, p. 77. (abstract.)Ontario, QuebecTectonics, Geochronology, Argon, Dyke
DS1989-0032
1989
Hanes, J.A.Archibald, D.A., Hanes, J.A., Queen, M., Ross, D., Farrar, E.Summary of 40Ar/30Ar geochronology in the Kapuskasing upliftGeological Association of Canada (GAC) Annual Meeting Program Abstracts, Vol. 14, p. A103. (abstract.)OntarioTectonics, Kapuskasing Lithoprobe
DS1989-1236
1989
Hanes, J.A.Powell, W.G., Hodgson, C.J., Hanes, J.A.The expression of the Larder Lake Break in the Matachewan areaOntario Geological Survey miscellaneous Paper, No. 143, pp. 125-132OntarioTectonics, Fault
DS1989-1247
1989
Hanes, J.A.Queen, M., Hanes, J.A., Archibald, D.A.40Ar 39Ar geochronology of dykes and their contact aureloes in the Kapuskasing uplift of the CanadianshieldGeological Association of Canada (GAC) Annual Meeting Program Abstracts, Vol. 14, p. A123. (abstract.)OntarioTectonics, Kapuskasing Zone
DS1990-0912
1990
Hanes, J.A.Lee, J.K.W., Onstott, T.C., Hanes, J.A.An 40 Ar/39Ar investigation of the contact effects of a dyke intrusion, Kapuskasing structural zone OntarioContributions to Mineralogy and Petrology, Vol. 105, No. 1, pp. 87-105OntarioKapuskasing Zone, Geochronology, Argon
DS1991-0658
1991
Hanes, J.A.Hanes, J.A.K-Ar and 40Ar/39Ar geochronology: methods and applicationsMineralogical Association of Canada -Short Course Handbook, Vol. 19, Chapter 2, pp. 27-57GlobalGeochronology, Argon, Thermochronology
DS1991-1197
1991
Hanes, J.A.Moser, D.E., Krogh, T.E., Heaman, L.M., Hanes, J.A., Helmstaedt, H.The age and significance of Archean mid-crustal extension in the Kapuskasing uplift, Superior Province, CanadaGeological Society of America Annual Meeting Abstract Volume, Vol. 23, No. 5, San Diego, p. A 134OntarioTectonics, Kapuskasing uplift
DS1992-0960
1992
Hanes, J.A.Lopez-Martinez, M., York, D., Hanes, J.A.A 40 Ar/39Ar geochronological study of komatiites and komatiitic basalts from the Lower On verwacht Volcanics: Barberton Mountainland, South AfricaPrecambrian Research, Vol. 57, No. 1-2, June pp. 91-120South AfricaKomatiites, Geochronology, Argon
DS1994-0709
1994
Hanes, J.A.Hanes, J.A., Archibald, D.A., Queen, M., Farrar, E.Constraints from 40Ar/39Ar geochronology on the tectonothermal history Of the Kapuskasing uplift.Canadian Journal of Earth Sciences, Vol. 31, No. 7, July pp. 1146-1171.OntarioGeochronology, Tectonics -Kapuskasing uplift
DS1995-1514
1995
Hanes, J.A.Powell, W.G., Hodgson, C.J., Hanes, J.A., Carmichael40Ar/39 Ar geochron. evidence for multiple post metamorphic hydrothermal events focussed along faultsCanadian Journal of Earth Sciences, Vol. 32, No. 6, June pp. 768-786Ontario, QuebecGeochronology, Argon, Abitibi greenstone belt
DS1996-0998
1996
Hanes, J.A.Moser, D.E., Heaman, L.M., Krogh, T.E., Hanes, J.A.Intracrustal extension of an Archean orogen revealed using single grain Ulead zircon geothermometry.Tectonics, Vol. 15, No. 5, Oct. pp. 1093-1109.OntarioSuperior Province, Wawa domain, Geochronology, Wawa gneiss domain
DS1996-1150
1996
Hanes, J.A.Queen, M., Heaman, L.M., Hanes, J.A., Archibald, B.A.40Ar/39Ar phlogopite and U- lead perovskite dating of lamprophyre dykes From the eastern Lake Superior regionCanadian Journal of Earth Sciences, Vol. 33, No. 6, June pp. 958-965.OntarioMidcontinent Rift volcanism., Geochronology
DS2003-0175
2003
Hanes, J.A.Buchan, K.L., Harris, B.A., Ernst, R.E., Hanes, J.A.Ar Ar dating of the Pickle Crow diabase dyke system in the western Superior CratonGeological Association of Canada Annual Meeting, Abstract onlyManitobaGeochronology
DS200412-0233
2003
Hanes, J.A.Buchan, K.L., Harris, B.A., Ernst, R.E., Hanes, J.A.Ar Ar dating of the Pickle Crow diabase dyke system in the western Superior Craton of the Canadian Shield of Ontario and implicaGeological Association of Canada Annual Meeting, Abstract onlyCanada, ManitobaGeochronology
DS201607-1295
2016
Hanes, J.A.Ernst, R.E., Hamilton, M.A., Soderlund, U., Hanes, J.A., Gladkochub, D.P., Okrugin, A.V., Kolotilina, T., Mekhonoshin, A.S., Bleeker, W., LeCheminant, A.N., Buchan, K.L., Chamberlain, K.R., Didenko, A.N.Long lived connection between southern Siberia and northern Laurentia in the Proterozoic.Nature Geoscience, Vol. 9, 6, pp. 464-469.Canada, RussiaProterozoic

Abstract: Precambrian supercontinents Nuna-Columbia (1.7 to 1.3 billion years ago) and Rodinia (1.1 to 0.7 billion years ago) have been proposed. However, the arrangements of crustal blocks within these supercontinents are poorly known. Huge, dominantly basaltic magmatic outpourings and intrusions, covering up to millions of square kilometres, termed Large Igneous Provinces, typically accompany (super) continent breakup, or attempted breakup and offer an important tool for reconstructing supercontinents. Here we focus on the Large Igneous Province record for Siberia and Laurentia, whose relative position in Nuna-Columbia and Rodinia reconstructions is highly controversial. We present precise geochronology—nine U -Pb and six Ar -Ar ages—on dolerite dykes and sills, along with existing dates from the literature, that constrain the timing of emplacement of Large Igneous Province magmatism in southern Siberia and northern Laurentia between 1,900 and 720 million years ago. We identify four robust age matches between the continents 1,870, 1,750, 1,350 and 720 million years ago, as well as several additional approximate age correlations that indicate southern Siberia and northern Laurentia were probably near neighbours for this 1.2-billion-year interval. Our reconstructions provide a framework for evaluating the shared geological, tectonic and metallogenic histories of these continental blocks.
DS1975-1086
1979
Haney, D.C.Johnson, W.D.JR., Haney, D.C.The Rough Creek Fault Zone, a Key to the Tectonics of the Mid-continent.Kentucky Geological Survey Symposium : Kentucky Geologic Mapping P, P. 13. (abstract.).GlobalMid-continent
DS201911-2542
2019
Haney, M.M.Lyons, J.J., Haney, M.M., Fee, D., Wech, A.G., Waythomas, C.F.Infrasound from giant bubbles during explosive submarine eruptions. BogoslofNature Geoscience, 10.1038/s41561-019-0461-0United States, Alaskavolcano

Abstract: Shallow submarine volcanoes pose unique scientific and monitoring challenges. The interaction between water and magma can create violent explosions just below the surface, but the inaccessibility of submerged volcanoes means they are typically not instrumented. This both increases the risk to marine and aviation traffic and leaves the underlying eruption physics poorly understood. Here we use low-frequency sound in the atmosphere (infrasound) to examine the source mechanics of shallow submarine explosions from Bogoslof volcano, Alaska. We show that the infrasound originates from the oscillation and rupture of magmatic gas bubbles that initially formed from submerged vents, but that grew and burst above sea level. We model the low-frequency signals as overpressurized gas bubbles that grow near the water-air interface, which require bubble radii of 50-220?m. Bubbles of this size and larger have been described in explosive subaqueous eruptions for more than a century, but we present a unique geophysical record of this phenomenon. We propose that the dominant role of seawater during the effusion of gas-rich magma into shallow water is to repeatedly produce a gas-tight seal near the vent. This resealing mechanism leads to sequences of violent explosions and the release of large, bubble-forming volumes of gas—activity we describe as hydrovulcanian.
DS201212-0078
2012
Hanfland, M.Boffa Ballaran, T., Kurosov, A., Glazyrin, K., Frost, D.J., Merlini, M., Hanfland, M., Caracas, R.Effect of chemistry on the compressibility of silicate perovskite in the lower mantle.Earth and Planetary Science Letters, Vol. 333-334, pp. 181-190.MantlePerovskite
DS201212-0465
2012
Hanfland, M.Merlini, M., Hanfland, M., Crichton, W.A.CaCO3-III and CaCO3-VI, high pressure polymorphs of calcite: possible host structures for carbon in the Earth's mantle.Earth and Planetary Science Letters, Vol. 333-334, pp. 265-271.MantleCarbon
DS201412-0297
2014
Hanfland, M.Glazyrin, K., Boffa Ballaran, T., Frost, D.J., McCammon, C., Kantor, A., Merlini, M., Hanfland, M., Dubrovinsky, L.Magnesium silicate perovskite and effect of iron oxidation state on its bulk sound velocity at the conditions of the lower mantle.Earth and Planetary Science Letters, Vol. 393, pp. 182-186.MantlePerovskite
DS201710-2219
2017
Hanfland, M.Cerantola, V., Bykova, E., Kupenko, I., Merlini, M., Ismailova, L., McCammon, C., Bykov, M., Chumakov, A.I., Petitgirard, S., Kantor, I., Svityk, V., Jacobs, J., Hanfland, M., Mezouar, M., Prescher, C., Ruffer, R., Prakapenka, V.B., Duvbovinsky, L.How iron carbonates help form diamonds.Nature Communications, July 18 #15960Mantlecarbonate inclusions
DS1975-0776
1978
Hangas, J.Kay, S.M., Kay, R.W., Hangas, J., Snedden, T.Crustal Xenoliths from Potassic Lavas, Leucite Hills, WyominGeological Society of America (GSA), Vol. 10, No. 7, P. 432. (abstract.).United States, Wyoming, Rocky Mountains, Leucite HillsBlank
DS201112-0085
2011
Hanger, B.J.Berry, A.J., Yaxley, G.M., Hanger, B.J., Woodland, A.B., De Jonge, M.D., Howard, D.L., Paterson, D.Quantitative mapping of the oxidation state of iron in mantle garnet.Goldschmidt Conference 2011, abstract p.522.TechnologyIndicator of diamond versus carbonate stability
DS201312-0077
2013
Hanger, B.J.Berry, A.J., Yaxley, G.M., Hanger, B.J., Woodland, A.B., De Jonge, M.D., Howard, D.L., Paterson, D., Kamenetsky, V.S.Quantitative mapping of the oxidative effects of mantle metasomatism.Geology, Vol. 41, pp. 683-686.Africa, South AfricaDeposit - Wesselton
DS201312-0359
2013
Hanger, B.J.Hanger, B.J., Yaxley, G.M., Berry, A.J., Kemenetsky, V.S., Paterson, D., Howard, D.L.Fe XANES measurements of Fe3 in garnet from the Kimberley pipe.Goldschmidt 2013, AbstractAfrica, South AfricaDeposit - Kimberley
DS201312-0993
2013
Hanger, B.J.Yaxley, G.M., Berry, A.J., Woodland, A.B., Hanger, B.J., Kamenetsky, V.S.Xenoliths, XANES and redox related processes in the cratonic lithosphere.Goldschmidt 2013, 1p. AbstractMantleRedox
DS201412-0338
2014
Hanger, B.J.Hanger, B.J., Yaxley, G.M., Berry, A.J., Kamenetsky, V.S.Relationships between oxygen fugacity and metasomatism in the Kaapvaal subcratonic mantle, represented by garnet peridotite xenoliths in the Wesselton kimberlite, South Africa.Lithos, Vol. 212-215 pp. 443-452.Africa, South AfricaDeposit - Wesselton
DS201712-2696
2018
Hanger, B.J.Jollands, M.C., Hanger, B.J., Yaxley, G.M., Hermann, J., Kilburn, M.R.Timescales between mantle metasomatism and kimberlite ascent indicated by diffusion profiles in garnet crystals from periodotite xenoliths.Earth and Planetary Science Letters, Vol. 481, pp. 143-153.Africa, South Africadeposit - Wesselton

Abstract: Rare garnet crystals from a peridotite xenolith from the Wesselton kimberlite, South Africa, have distinct zones related to two separate episodes of mantle metasomatism. The garnet cores were firstly depleted through melt extraction, then equilibrated during metasomatism by a potentially diamond-forming carbonate-bearing or proto-kimberlitic fluid at 1100-1300?°C and 4.5-5.5 GPa. The garnet rim chemistry, in contrast, is consistent with later overgrowth in equilibrium with a kimberlite at around and . This suggests that the rock was physically moved upwards by up to tens of kilometres between the two metasomatic episodes. Preserved high Ca, Al and Cr contents in orthopyroxenes suggest this uplift was tectonic, rather than magmatic. Diffusion profiles were measured over the transitions between garnet cores and rims using electron microprobe (Mg, Ca, Fe for modelling, plus Cr, Mn, Ti, Na, Al) and nano Secondary Ion Mass Spectrometry (NanoSIMS; 89Y, along with 23Na, Ca, Cr, Fe, Mn and Ti) analyses. The short profile lengths (generally <10 ?m) and low Y concentrations (0.2-60 ppm) make the NanoSIMS approach preferable. Diffusion profiles at the interface between the zones yield constraints on the timescale between the second metasomatic event and eruption of the kimberlite magma that brought the xenolith to the surface. The time taken to form the diffusion profiles is on the order of 25 days to 400 yr, primarily based on modelling of Y diffusion along with Ca, Fe and Mg (multicomponent diffusion) profiles. These timescales are too long to be produced by the interaction of the mantle xenolith with the host kimberlite magma during a single-stage ascent to the crust (hours to days). The samples offer a rare opportunity to study metasomatic processes associated with failed eruption attempts in the cratonic lithosphere.
DS201808-1755
2018
Hanger, B.J.Jollands, M.C., Hanger, B.J., Yaxley, G.M., Hermann, J., Kilburn, M.R.Timescales between mantle metasomatism and kimberlite ascent indicated by diffusion profiles in garnet crystals from peridotite xenoliths.Earth and Planetary Science Letters, Vol. 481, 1, pp. 143-153.Mantlekimberlite

Abstract: Rare garnet crystals from a peridotite xenolith from the Wesselton kimberlite, South Africa, have distinct zones related to two separate episodes of mantle metasomatism. The garnet cores were firstly depleted through melt extraction, then equilibrated during metasomatism by a potentially diamond-forming carbonate-bearing or proto-kimberlitic fluid at 1100-1300?°C and 4.5-5.5 GPa. The garnet rim chemistry, in contrast, is consistent with later overgrowth in equilibrium with a kimberlite at around and . This suggests that the rock was physically moved upwards by up to tens of kilometres between the two metasomatic episodes. Preserved high Ca, Al and Cr contents in orthopyroxenes suggest this uplift was tectonic, rather than magmatic. Diffusion profiles were measured over the transitions between garnet cores and rims using electron microprobe (Mg, Ca, Fe for modelling, plus Cr, Mn, Ti, Na, Al) and nano Secondary Ion Mass Spectrometry (NanoSIMS; 89Y, along with 23Na, Ca, Cr, Fe, Mn and Ti) analyses. The short profile lengths (generally <10 ?m) and low Y concentrations (0.2-60 ppm) make the NanoSIMS approach preferable. Diffusion profiles at the interface between the zones yield constraints on the timescale between the second metasomatic event and eruption of the kimberlite magma that brought the xenolith to the surface. The time taken to form the diffusion profiles is on the order of 25 days to 400 yr, primarily based on modelling of Y diffusion along with Ca, Fe and Mg (multicomponent diffusion) profiles. These timescales are too long to be produced by the interaction of the mantle xenolith with the host kimberlite magma during a single-stage ascent to the crust (hours to days). The samples offer a rare opportunity to study metasomatic processes associated with failed eruption attempts in the cratonic lithosphere.
DS2003-0547
2003
Hanghjoi, K.Hanghjoi, K., Storey, M., Stecher, O.An isotope and trace element study of the East Greenland Tertiary dyke swarm:Journal of Petrology, Vol. 44, 11, Nov. pp. 2081-2112.GreenlandDyke - geochemistry
DS200412-0781
2003
Hanghjoi, K.Hanghjoi, K., Storey, M., Stecher, O.An isotope and trace element study of the East Greenland Tertiary dyke swarm: constraints on temporal and spatial evolution duriJournal of Petrology, Vol. 44, 11, Nov. pp. 2081-2112.Europe, GreenlandDyke - geochemistry
DS200612-0130
2006
Hanghoi, K.Bernstein, S., Hanghoi, K., Kelemen, P., Brooks, C.Ultra depleted shallow cratonic mantle beneath West Greenland: dunitic xenoliths from Ubekendt Ejand.Contributions to Mineralogy and Petrology, Vol. 152, 3, pp. 335-347.Europe, GreenlandMineral chemistry
DS200612-0131
2006
Hanghoj, K.Bernstein, S., Hanghoj, K., Kelemen, P.B., Brooks, C.K.Ultra depleted, shallow cratonic mantle beneath West Greenland: dunitic xenoliths from Ubekendt Ejland.Contributions to Mineralogy and Petrology, in press availableEurope, GreenlandMineralogy - xenoliths not specific to diamonds
DS200712-0075
2007
Hanghoj, K.Bernstein, S., Kelemen, P.B., Hanghoj, K.Consistent olivine Mg# in cratonic mantle reflects Archean mantle melting to the exhaustion of orthopyroxene.Geology, Vol. 35, 5, May pp. 459-462.MantleMelting
DS202008-1422
2020
Hangi, K.McKensie, L., Kilgore, A.H., Peslier, A.D., Brandon, L.A., Schaffer, R.V., Graff, T.G., Agresti, D.G., O'Reilly, S.Y., Griffin, W.L., Pearson, D.G., Hangi, K., Shaulis, B.J.Metasomatic control of hydrogen contents in the layered cratonic mantle lithosphere sampled by Lac de Gras xenoliths in the central Slave craton, Canada.Geochimica et Cosmochimica Acta, in press available, doi.org/101016 /j.gca.2020.07.013 45p. PdfCanada, Northwest Territoriesdeposit - Lac de Gras

Abstract: Whether hydrogen incorporated in nominally anhydrous mantle minerals plays a role in the strength and longevity of the thick cratonic lithosphere is a matter of debate. In particular, the percolation of hydrogen-bearing melts and fluids could potentially add hydrogen to the mantle lithosphere, weaken its olivines (the dominant mineral in mantle peridotite), and cause delamination of the lithosphere's base. The influence of metasomatism on hydrogen contents of cratonic mantle minerals can be tested in mantle xenoliths from the Slave Craton (Canada) because they show extensive evidence for metasomatism of a layered cratonic mantle. Minerals from mantle xenoliths from the Diavik mine in the Lac de Gras kimberlite area located at the center of the Archean Slave craton were analyzed by FTIR for hydrogen contents. The 18 peridotites, two pyroxenites, one websterite and one wehrlite span an equilibration pressure range from 3.1 to 6.6 GPa and include samples from the shallow (? 145 km), oxidized ultra-depleted layer; the deeper (?145-180 km), reduced less depleted layer; and an ultra-deep (? 180 km) layer near the base of the lithosphere. Olivine, orthopyroxene, clinopyroxene and garnet from peridotites contain 30 - 145, 110 - 225, 105 - 285, 2 - 105 ppm H2O, respectively. Within each deep and ultra-deep layer, correlations of hydrogen contents in minerals and tracers of metasomatism (for example light over heavy rare-earth-element ratio (LREE/HREE), high-field-strength-element (HFSE) content with equilibration pressure) can be explained by a chromatographic process occurring during the percolation of kimberlite-like melts through garnet peridotite. The hydrogen content of peridotite minerals is controlled by the compositions of the evolving melt and of the minerals and by mineral/melt partition coefficients. At the beginning of the process, clinopyroxene scavenges most of the hydrogen and garnet most of the HFSE. As the melt evolves and becomes enriched in hydrogen and LREE, olivine and garnet start to incorporate hydrogen and pyroxenes become enriched in LREE. The hydrogen content of peridotite increases with decreasing depth, overall (e.g., from 75 to 138 ppm H2O in the deep peridotites). Effective viscosity calculated using olivine hydrogen content for the deepest xenoliths near the lithosphere-asthenosphere boundary overlaps with estimates of asthenospheric viscosities. These xenoliths cannot be representative of the overall cratonic root because the lack of viscosity contrast would have caused basal erosion of lithosphere. Instead, metasomatism must be confined in narrow zones channeling kimberlite melts through the lithosphere and from where xenoliths are preferentially sampled. Such localized metasomatism by hydrogen-bearing melts therefore does not necessarily result in delamination of the cratonic root.
DS1910-0416
1914
Hanig, A.Hanig, A.Die Deutsche Diamanten IndustrieOest. Zeitschr. F.b.u.h., JANUARY 21ST.Southwest Africa, NamibiaDiamond Industry
DS1984-0334
1984
Hanish, M.B.Hanish, M.B.Peridotite xenoliths from Bultfontein and Jagersfontein Mines. a case for pre-kimberlite serpentinization.Queen's University of, Msc. 119p.South AfricaPetrography, Lizardite, Tectonothermal, Deposit - Jagersfontein, Bultfontein
DS1984-0335
1984
Hanish, M.B.Hanish, M.B.Peridotite Xenoliths from Bultfontein and Jagersfontein Mines, South Africa; a Case for Pre-kimberlite Serpentinization.Msc. Thesis, Queen's University, 121P.South AfricaPetrology
DS1984-0336
1984
Hanish, M.B.Hanish, M.B., Helmstaedt, H.Prekimberlitic Serpentinization of Peridotite Xenoliths, Bultfontein and Jagersfonetin Mines, R.s.a.- Implications for Upper Mantle Models.Geological Society of America (GSA), Vol. 16, No. 6, P. 529. (abstract.).South AfricaPetrography
DS200512-0589
2005
Hanka, K.Kumar, P.R., Kind, W., Hanka, K., Wylegalla, Ch., Reigber, X., Yuan, I., Woelbern, P., GudmundssonThe lithosphere-asthenosphere boundary in the North West Atlantic region.Earth and Planetary Science Letters, Vol. 236, pp. 249-257.EuropeBoundary
DS2003-0812
2003
Hanka, W.Li, X., Kind, R., Yuan, X., Sobolev, S.V., Hanka, W., Ramesh, D.S., Gu, Y.Seismic observation of narrow plumes in the oceanic upper mantleGeophysical Research Letters, Vol. 30, 6, p. 67. DOI10.1029/2002GLO15411MantlePlumes
DS200412-1130
2003
Hanka, W.Li, X., Kind, R., Yuan, X., Sobolev, S.V., Hanka, W., Ramesh, D.S., Gu, Y., Dziewonski, A.M.Seismic observation of narrow plumes in the oceanic upper mantle.Geophysical Research Letters, Vol. 30, 6, p. 67. DOI10.1029/2002 GLO15411MantleGeophysics - seismics Plumes
DS201112-0289
2011
Hanke, K.Druiventak, A., Trepmann, C.A., Renner, J., Hanke, K.Low temperature plasticity of olivine during high stress deformation of peridotite at lithospheric conditions - an experimental study.Earth and Planetary Science Letters, Vol. 311, 3-4, pp. 199-211.MantlePeridotite
DS1999-0805
1999
Hanks, C.Witteman, J., Davis, L.M., Hanks, C.Regulatory approval process for BHP's Ekati diamond mine, NorthwestTerritories, Canada.Mining in the Arctic, Udd and Keen editors, Balkema, pp. 7-11.Northwest TerritoriesEnvironmental, permits, legal, Deposit - Ekati
DS2002-1731
2002
Hanks, C.Witteman, J., Bealieu, R., Burlinggame, D., Hanks, C.The contribution of BHP Billiton's Ekati diamond mine to sustainable development in Canada's north.Australian Institute of Mining and Metallurgy, No. 3/2002, pp.179-84.Northwest TerritoriesMining - environmental agreement, socioeconomic, Deposit - Ekati
DS201012-0423
2010
Hanks, C.Landry, F., Denholm, E., Hanks, C.Fish habitat compensation and mining in the North. Ekati has two compensation programs.38th. Geoscience Forum Northwest Territories, Abstract p. 60.Canada, Northwest TerritoriesEkati
DS1860-0106
1870
Hanks, H.G.Hanks, H.G.Diamonds in California; August, 1870Mining And Scientific Press, Vol. 21, P. 122, AUGUST 20.United States, CaliforniaDiamond Occurrence
DS1860-0107
1870
Hanks, H.G.Hanks, H.G.Diamonds in California; March, 1870 AmadorMining and Scientific Press, Vol. 20, MARCH 12, P. 162.United States, CaliforniaDiamond Occurrence
DS1860-0383
1882
Hanks, H.G.Hanks, H.G.Diamonds in California. Report of the State MineralogistSecond Report of The State Mineralogist From December 1, 188, No. 2, PP. 241-254.United States, California, Nevada CountyDiamond Occurrence
DS1860-0437
1884
Hanks, H.G.Hanks, H.G.Fourth Report of the State Mineralogist. Catalogue of Minerals of California.California Min. Bur. Report, No. 4, 410P.United States, CaliforniaDiamond Occurrence
DS1860-0467
1885
Hanks, H.G.Hanks, H.G.Diamond from Cherokee Flat, Butte CountyCalifornia State Min. Bureau Report, No. 5, P. 68.United States, California, MontanaDiamond Occurrence
DS1860-0509
1886
Hanks, H.G.Hanks, H.G.Diamonds in California, 1886California State Mining Bureau, 6th. Annual Report., 145P.United States, CaliforniaDiamond Occurrence
DS1860-0552
1887
Hanks, H.G.Hanks, H.G.Diamonds in California; September, 1887 AmadorMining and Scientific Press, Vol. 54, SEPT. 3RD. P. 149.United States, CaliforniaDiamond Occurrence
DS201412-1027
2014
Hanley, J.Zhang, Z., Fedortchuk, Y., Hanley, J.Experimental constraints of diamond destructive fluids in kimberlite magma and in the sub-cratonic lithosphere.Goldschmidt Conference 2014, 1p. AbstractMantleKimberlite magmatism
DS200612-0954
2006
Hanley, J.J.Mungall, J.E., Hanley, J.J., Arndt, N.T., Debecdelievre, A.Evidence from meimechites and other low degree mantle melts for redox controls on mantle crust fractionation of platinum group elements.Proceedings of National Academy of Science USA, Vol. 103, 34, pp. 12695-12700.MantleMeimechite, PGE
DS201312-1012
2013
Hanley, J.J.Zhang, Z., Fedortchouk, Y., Hanley, J.J.Pressure effect on diamond resorption morphology.GAC-MAC 2013 SS4: from birth to the mantle emplacement in kimberlite., abstract onlyMantleDiamond morphology
DS202012-2257
2020
Hanley, J.J.Zhang, Z., Fedortchouk, Y., Hanley, J.J., Kerr, M.Diamond resorption and immiscibility of C-O-H fluid in kimberlites: evidence from experiments in H2O-CO2-SiO2-MgO-CaO system at 1-3 GPa.Lithos, in press available 15p. PdfMantlediamond morphology

Abstract: Kimberlites are the deepest sourced magmas emplaced at the Earth's surface. They provide a “window” into the processes at the base of the subcratonic mantle. A better understanding of the origin, composition, and emplacement mechanisms of kimberlites is hampered by uncertainties in the contents of the two main volatiles, H2O and CO2. Diamond dissolution in H2O and in CO2 fluids produces distinct resorption features offering an opportunity to determine the composition of the magmatic fluid in kimberlites. Here we examined the relationship between H2O:CO2 ratio of the fluid and the style of diamond resorption by conducting experiments in C-O-H fluid saturated with silicates with variable H2O:CO2 ratios at the conditions of kimberlite ascent of 1-3 GPa and 1150-1350 °C. Our results showed that the geometry of etch pits on diamond and the resorption style evolve consistently as bulk CO2 content of the fluid changes from 0 to 50 to 50-90 and 90-100 mol%. The fluid composition at the run conditions was monitored by entrapment of synthetic fluid inclusions in olivine and quartz. The inclusions demonstrated the existence of a fluid miscibility gap at 1-3 GPa and 1250 °C with two fluid endmembers, an aqueous and a carbonic phase, which H2O:CO2 ratio at 1 GPa determined with confocal Raman microscopy is (H2O)0.62(CO2)0.38 and (H2O)0.12(CO2)0.88 respectively. Hence, diamond resorption morphology depends on the proportions of the end-member aqueous and carbonic fluids, which vary with the bulk composition of the fluid. The different density and ability of aqueous and carbonic fluids to dissolve silicates (olivine) would promote their separation in the rising magma column. Concentration of the lower density aqueous fluid towards the tip of the propagating dyke would facilitate more efficient fracturing of the country rocks and faster ascent of the kimberlite magma causing explosive eruption. We propose that preferential attachment of aqueous fluid bubbles would help to increase the buoyancy of olivine xenocrysts and possibly diamond in the kimberlite magma offering a mechanism for transporting the heavy mantle cargo.
DS1996-0592
1996
Hanley, N.Hanley, N., Shogren, J.F., White, B.Environmental economics in theory and practiceOxford University of Press, 472p. $ 52.00GlobalBook - ad, Environment -economics
DS2000-0210
2000
HanmerDavis, W.J., Hanmer, Aspler, Sandeman, Tella, ZaleskiRegional differences in the Neoarchean crustal evolution of the Western Churchill Province: sense??Geological Association of Canada (GAC)/Mineralogical Association of Canada (MAC) 2000 Conference, 4p. abstract.Manitoba, Western CanadaGeochronology - Hearne domain
DS200412-1515
2003
HanmerPehrsson, S.J., Peterson, T., Davis, W.J., Sandeman, Skulski, Van Breenen, Hartlaub, Wodicks, Hanmer, CousensAncient Archean crust in the Western Churchill Province: a review of direct and indirect evidence.31st Yellowknife Geoscience Forum, p. 75. (abst.)Canada, Saskatchewan, Manitoba, NunavutTectonics - lithosphere
DS200412-1516
2003
HanmerPehrsson, S.J., Peterson, T., Davis, W.J., Sandeman, Skulski, Van Breenen, Hartlaub, Wodicks, Hanmer, CousensThe Western Churchill metallogeny project: from Melville to Uranium City, a new look at the largest under explored Craton in the31st Yellowknife Geoscience Forum, p. 77. (abst.)Canada, Saskatchewan, Manitoba, Northwest Territories, NunavutBedrock compilation
DS200512-0174
2005
Hanmer, P.T.C.Clowes, R.M., Hanmer, P.T.C., Van der Velden, A.J.The Trans Canada crustal cross section: imaging the internal structure of our continent.GAC Annual Meeting Halifax May 15-19, Abstract 1p.CanadaGeophysics - seismics
DS1990-0650
1990
Hanmer, S.Hanmer, S.Natural rotated inclusions in non-ideal shearTectonophysics, Vol. 176, No. 3/4, May 10, pp. 245-255Ontario, GrenvilleShear zones, Structure
DS1991-0659
1991
Hanmer, S.Hanmer, S., Passchier, C.Shear sense indicators: a reviewGeological Survey of Canada Paper, No. 90-17, 70pGlobalStructure -flow, rheology, strain, shape fabrics, shear, Inclusions, porphyroblasts
DS1992-0661
1992
Hanmer, S.Hanmer, S., Bowring, S., Van Breemen, O., Parrish, R.Great Slave Lake shear zone, northwest Canada: mylonitic record of early Proterozoic continental convergence, collision and indentationJournal of Structural Geology, Vol. 14, No. 7, pp. 757-773Northwest TerritoriesStructure Tectonics, Shear zone
DS1992-1063
1992
Hanmer, S.Milkereit, B., Forsyth, D.A., Green, A.G., Davidson, A., Hanmer, S.Seismic images of a Grenvillian terrane boundaryGeology, Vol. 20, No. 11, November pp. 1027-1030OntarioGeophysics -seismics, Terrane
DS1995-0741
1995
Hanmer, S.Hanmer, S., Williams, M., Kopf, C.Modest movements, spectacular fabrics intracontinental deep crustal strikeslip fault: Athabaska mylonite zoneJournal of Structural Geology, Vol. 17, No. 4, pp. 493-507Saskatchewan, Alberta, Northwest TerritoriesTrans-Hudson Orogen, Rae, Hearne, Snowbird tectonic zones, Structure, tectonics
DS1995-1785
1995
Hanmer, S.Snoeyenbos, D.R., Williams, M.C., Hanmer, S.Archean high pressure metamorphism in the western Canadian ShieldEur. Journal of Mineralogy, Vol. 7, No. 6, Nov. 1, pp. 1251-1272Cordillera, British Columbia, Alberta, Yukonmetamorphism, Shield
DS1996-1093
1996
Hanmer, S.Pehrsson, S., Hanmer, S., Van Breemen, O.uranium-lead (U-Pb) geochronology of the Raglan gabbro belt: implications for an ensialic marginal basin GrenvilleCanadian Journal of Earth Sciences, Vol. 33, pp. 691-702.Quebec, Labrador, UngavaGeochronology, Orogeny - Grenville
DS2000-0384
2000
Hanmer, S.Hanmer, S., Aspler, L., Sandeman, Davis, Peterson, RelfHenik - Kaminak - Tavani supracrustal belt. late Archean oceanic crust and island arc remnants....Geological Association of Canada (GAC)/Mineralogical Association of Canada (MAC) 2000 Conference, 4p. abstract.Northwest Territories, ChurchillProterozoic reworking, Structure
DS2000-0385
2000
Hanmer, S.Hanmer, S., Sandeman, H.A., Davis, W.J.NeoArchean tectonic setting of the Hearne domain, western Churchill Province: is there a modern analogue.28th. Yellowknife Geoscience Forum, p. 32-3.abstractNorthwest TerritoriesTectonics, Hearne Domain
DS2000-0605
2000
Hanmer, S.MacLachlan, K., Hanmer, S., Berman, W.J., Ryan, RelfComplex, protracted, Proterozoic reworking Western Churchill Province: the craton that wouldn't grow up.Geological Association of Canada (GAC)/Mineralogical Association of Canada (MAC) 2000, 4p. abstractWestern Canada, Northwest Territories, SaskatchewanTectonics - craton, Geothermometry
DS2000-0813
2000
Hanmer, S.Relf, C., Hanmer, S.A summary of post Archean magmatic and tectonothermal events western Churchill Province: to mantle and back.28th. Yellowknife Geoscience Forum, p.65-6.abstractNorthwest TerritoriesMagmatism, Tectonics
DS2002-0650
2002
Hanmer, S.Hanmer, S., Hamilton, M.A., Crowley, J.L.Geochronological constraints on Paleoarchean thrust nappe and Neoarchean accretionary tectonics in southern West Greenland.Tectonophysics, Vol. 350,No.3, pp. 255-71.GreenlandGeochronology - not specific to diamonds
DS2002-0788
2002
Hanmer, S.Jones, A.G., Snyder, D., Hanmer, S., Asudeh, I., White, D., Eaton, D., Clarke, G.Magnetotelluric and teleseismic study across the Snowbird Tectonics Zone of theGeophysical Research Letters, Vol. 29, 17, 10.1029/2002GL015359Manitoba, Saskatchewan, AlbertaGeophysics - MT, seismics
DS200412-0420
2004
Hanmer, S.Davis, W.J., Hanmer, S., Sandeman, H.A.Temporal evolution of the Neoarchean central Hearne supracrustal belt: rapid generation of juvenile crust in a supra subduction zPrecambrian Research, Vol. 134, no. 1-2, Sept. 20, pp. 85-112.Canada, Nunavut, Northwest TerritoriesSubduction
DS200412-0782
2004
Hanmer, S.Hanmer, S., Sandeman, H.A., Davis, W.J., Aspler, L.B., Rainbird, R.H., Ryan, J.J., Relf, C., Peterson, T.D.Geology and Neoarchean tectonic setting of the Central Hearne supracrustal belt, Western Churchill Province, Nunavut, Canada.Precambrian Research, Vol. 134, 1-2, pp. 63-83.Canada, NunavutTectonics - not specific to diamonds
DS200412-1727
2004
Hanmer, S.Sandeman, H.A., Hanmer, S., Davis, W.J., Ryan, J.J., Peterson, T.D.Neoarchean volcanic rocks, central Hearne supracrustal belt, Western Churchill Province: geochemical and isotopic evidence suppoPrecambrian Research, Vol. 134, no. 1-2, Sept. 20, pp. 113-141.Canada, Nunavut, Northwest TerritoriesSubduction
DS200612-1533
2006
Hanmer, S.Williams, M.L., Hanmer, S.Structural and metamorphic process in the lower crust: evidence from a deep crustal isobarically cooled terrane, Canada.Evolution and differentiation of Continental Crust, ed. Brown, M., Rushmer, T., Cambridge Univ. Press, Chapter 2, pp. 231-267.Mantle, CanadaHP, geochemistry
DS200612-1534
2006
Hanmer, S.Williams, M.L., Hanmer, S.Structural and metamorphic processes in the lower crust: evidence from a deep crustal isobarically cooled terrane, Canada.Brown, M., Rushmer, T., Evolution and differentiation of the continental crust, Cambridge Publ., Chapter 7,CanadaMetamorphism
DS1860-0662
1890
Hanna, G.B.Hanna, G.B.Geology of North CarolinaCharlotte: A.d. Smith And Co., 465P.United States, North CarolinaDiamond Occurrence
DS1900-0191
1903
Hanna, G.B.Hanna, G.B.History of Mining in MecklenburgIn: History of Mecklenburg County And The City of Charlotte, CHARLOTTE: OBSERVER PRINTING, 2 VOLS. Vol. 2, P. 115.United States, North Carolina, AppalachiaMining
DS1990-0651
1990
Hanna, M.S.Hanna, M.S., Chang, T.On graphically representing the confidence region for an unknown rotationin three dimensionsComputers and Geosciences, Vol. 16, No. 2, pp. 163-194GlobalComputer, Program -program -graphics/three dimensions
DS1997-0472
1997
Hanna, P.Hanna, P.Resources and reserves - towards 2000Australian Institute of Mining and Metallurgy (AusIMM) Bulletin, No. 5, Aug, pp. 58, 60AustraliaEconomics, ore reserves, geostatistics, Legal, reporting
DS1993-1437
1993
Hanna, S.Sharkov, Ye.V., Lazko, Ye.Ye., Hanna, S.Plutonic xenoliths from the Nabi Matta explosive centre northwest SyriaGeochemistry International, Vol. 30, No. 4, pp. 23-44.SyriaEclogites, Xenoliths
DS2003-0999
2003
Hanna, S.Nasir, S., Hanna, S., Hajari, S.The petrogenetic association of carbonatite and alkaline magmatism: constraints fromMineralogy and Petrology, Vol. 77, 3/4, pp. 235-258.OmanCarbonatite
DS2003-1000
2003
Hanna, S.Nasir, S., Hanna, S., Hajari, S.The petrogenetic association of carbonatite and alkaline magmatism: constraints fromMineralogy and Petrology, Vol. 77, 3-4, pp. 235-58.OmanCarbonatite
DS200412-1408
2003
Hanna, S.Nasir, S., Hanna, S., Hajari, S.The petrogenetic association of carbonatite and alkaline magmatism: constraints from the Masfut-Rawda Ridge, Northern Oman MountMineralogy and Petrology, Vol. 77, 3/4, pp. 235-258.Africa, Arabia, OmanCarbonatite
DS1995-0742
1995
Hanna, S.H.Hanna, S.H.The problem of diamond bearing in SyriaProceedings of the Sixth International Kimberlite Conference Extended Abstracts, p. 220-22.SyriaAl Nabi, Matta diatreme, Kadmus, Kadmaus, Alepp, Muhelbe, Ajrband, Jlagi
DS1989-0580
1989
Hanna, W.Hanna, W.Management dialogue- leadership for the 90's. Team leadershipCoopers and Lybrand The mining Letter, Vol. 6, No. 3, July pp. 4 # 18085GlobalEconomics, Leadership -brief overview
DS1960-0352
1963
Hannaford, G.B.Hannaford, G.B.Diamond Mining and Recovery TodayGems And Gemology, PP. 67-69; PP. 94-95.South AfricaPlacers, Pipes
DS1960-0458
1964
Hannaford, G.B.Hannaford, G.B.More Dollars for DiamondsNew York: N.w. Ayer And Sons., 47P.GlobalKimberley, Investment
DS1981-0121
1981
Hannaford, W.Coles, R.L., Haines, G.V., Hannaford, W.Broad Scale Magnetic Anomalies Over Central and Eastern Canada: a Discussion.Canadian Journal of Earth Sciences, Vol. 18, PP. 657-661.Canada, OntarioMid-continent, Geophysics
DS200912-0276
2009
Hannahan, M.Hannahan, M., Brey, G., Woodland, A., Altherr, R., Seitz, H-M.Li as a barometer for bimineralic eclogites: experiments in CMAS.Contributions to Mineralogy and Petrology, In press available 16p.MantleEclogite - barometry
DS200912-0277
2009
Hannahan, M.Hannahan, M., Brey, G., Woodland, A., Seitz, H-M., Ludwig, T.Li as a barometer for bimineralic eclogites: experiments in natural systems.Lithos, In press available, 34p.TechnologyDeposit - Roberts Victor
DS1983-0214
1983
Hannak, W.Eisenburger, D., Hannak, W., Haut, R., Knabe, W., Levin, P., MullCircular Magnetic Structures in Upper Volta and Their Geological Significance for Prospecting.Journal of AFRICAN EARTH SCI., Vol. 1, No. 3-4, P. 358. (abstract.).West Africa, Upper VoltaGeotectonics
DS201112-0409
2011
Hannam, S.Hannam, S., Bailey, B.L., Lindsay, M.B.J., Gibson, B., Blowes, D.W., Paktunc, A.D., Smith, L., Sego, D.C.Diavik waste rock project: geochemical and mineralogical characterization of waste rock weathering at the Diavik diamond mine.Yellowknife Geoscience Forum Abstracts for 2011, abstract p. 43-44.Canada, Northwest TerritoriesMining - waste rock
DS1860-0338
1880
Hannay, J.B.Hannay, J.B.Artificial Diamonds. #1Nature., Vol. 22, PP. 225-257.GlobalDiamond Synthesis
DS200512-0398
2004
Hanne, D.Hanne, D., White, N., Butler, A., Jones, S.Phanerozoic vertical motions of Hudson Bay.Canadian Journal of Earth Sciences, Vol. 41, 10, Oct. pp. 1181-1200.Canada, Ontario, ManitobaTectonics
DS1990-0652
1990
Hanneman, D.L.Hanneman, D.L., Wideman, C.J.Paleosols: reflectors in continental sequencesGeophysics: The Leading Edge, Vol. 9, No. 11, November pp. 38-40MontanaPaleosols, Geophysics -seismics
DS1983-0278
1983
Hanneman, W.M.Hanneman, W.M.A New Classification for Red to Violet GarnetsGems And Gemology, Vol. 19, No. 1, SPRING, PP. 37-42.GlobalCrystallography
DS2002-0404
2002
Hannigan, R.E.Draut, A.E., Clift, P.D., Hannigan, R.E., Layne, G., Shimizu, N.A model for continental crust genesis by arc accretion: rare earth element evidence from the Irish Caledonides.Earth and Planetary Science Letters, Vol. 203, 3-4, pp. 861-877.Ireland, ScandinaviaOrogenesis - REE
DS2001-0758
2001
HanningtonMcInnes, B.I.A., Gregoire, Binss, Herzig, HanningtonHydrous metasomatism of oceanic sub arc mantle: petrology, geochemistry of fluid metasom. mantle wedgeEarth and Planetary Science Letters, Vol. 188, No. 1, May 30, pp.169-83.Papua New GuineaXenoliths, Metasomatism - not specific to diamonds
DS201704-0628
2017
Hannington, M.Hannington, M., Petersen, S., Kratschell, A.Subsea mining moves closer to shore.Nature Geoscience, Vol. 10, 3, pp. 158-159.TechnologyMining - seabed

Abstract: Mining the deep seabed is fraught with challenges. Untapped mineral potential under the shallow, more accessible continental shelf could add a new dimension to offshore mining and help meet future mineral demand.
DS2003-0548
2003
Hannseon, J.E.Hannseon, J.E.On the use of magnetics and gravity to discriminate between gabbro and iron rich oreExploration Geophysics, Vol. 34, 1-2, pp. 110-113.GlobalGeophysics - gravimetry not specific to diamonds
DS200412-0783
2003
Hannseon, J.E.Hannseon, J.E.On the use of magnetics and gravity to discriminate between gabbro and iron rich ore forming systems.Exploration Geophysics, Vol. 34, 1-2, pp. 110-113.TechnologyGeophysics - gravimetry not specific to diamonds
DS1989-0581
1989
Hannssen, L.M.Hannssen, L.M., Carrington, W.A., Butler, J.E., Snail, K.A.Diamond synthesis using an oxygen acetylene torchMaterial Letters, Vol. 7, No. 7-8, Dec. pp. 289-292GlobalDiamond synthesis
DS1999-0716
1999
HannwegStiefenhofer, J., Voljoen, Tainton, Dobbe, HannwegThe petrology of a mantle xenolith suite from Venetia, South Africa #27th International Kimberlite Conference Nixon, Vol. 2, pp. 836-45.South AfricaXenoliths, petrography, mineral chemistry, geothermomet, Deposit - Venetia
DS1998-1309
1998
Hannweg, G.W.Seggie, A.G., Hannweg, G.W., Colgan, E.A., Smith, C.B.Geology and geochemistry of the Venetia kimberlite cluster, northernProvince, South Africa.7th. Kimberlite Conference abstract, pp. 775-7.South AfricaGeology, petrography, mineral chemistry, Deposit - Venetia cluster
DS1999-0646
1999
Hannweg, G.W.Seggie, A.G., Hannweg, G.W., Colgan, E.A., Smith, C.B.The geology and geochemistry of the Venetia kimberlite cluster: northern province South Africa.7th International Kimberlite Conference Nixon, Vol. 2, pp. 750-56.South Africa, ZimbabweGeology, geochemistry, mineral analyses, Group I, Deposit - Venetia, River Ranch
DS1998-0572
1998
Hanon, P.Hanon, P., Robert, F., Chuassidon, M.High carbon concentrations in meteoritic chondrules: a record of metalsilicate differentiationGeochimica et Cosmochimica Acta, Vol. 62, No. 5, March pp. 903-913GlobalMeteorites, Chondrites
DS1970-0180
1970
Hanor, J.S.Reid, A.M., Hanor, J.S.Pyrope in KimberliteAmerican MINERALOGIST., Vol. 55, PP. 1374-1379.South AfricaInclusions, Mineralogy
DS2003-0549
2003
Hanrahan, M.Hanrahan, M., Stachel. T., Brey, G.P., Lahaye, Y.Garnet peridotite xenoliths from the Koffiefontein mine, South Africa8 Ikc Www.venuewest.com/8ikc/program.htm, Session 6, POSTER abstractSouth AfricaDeposit - Koffiefontein
DS200412-0784
2003
Hanrahan, M.Hanrahan, M., Stachel,T., Brey, G.P., Lahaye, Y.Garnet peridotite xenoliths from the Koffiefontein mine, South Africa.8 IKC Program, Session 6, POSTER abstractAfrica, South AfricaMantle petrology Deposit - Koffiefontein
DS200712-0410
2007
Hanrahan, M.Hanrahan, M., Brey, G.Li as a barometer for bimineralic eclogites.Plates, Plumes, and Paradigms, 1p. abstract p. A379.MantleEclogite - marjorites
DS201012-0081
2009
HansenBurns, R.C., Chumakov, A.I., Connell, Dube, Godfried, Hansen, Hartwig, Hoszowska, Masiello, Mkonza, RebakHPHT growth and x-ray characterization of the high quality type IIa diamond.Journal of Physics Condensed Matter, Vol. 21, 36, pp. 364224-364237.TechnologyType II a
DS1994-0691
1994
Hansen, B.J.Hager, J.P., Hansen, B.J., et al.Extraction and processing for the treatment and minimization of wastes1994Tms, 1, 1153 pUnited StatesWaste treatment, Book -ad
DS201503-0155
2015
Hansen, B.T.Kleinhanns, I.C., Fullgraf, T., Wilsky, F., Nolte, N., Fliegel, D., Klemd, R., Hansen, B.T.U-Pb zircon ages and (isotope) geochemical signatures of the Kamanjab In lier ( NW Namibia): constraints on Palaeoproterozoic crustal evolution along the southern Congo craton.Geological Society of London Special Publication: Continent formation through time., No. 389, pp. 165-195.Africa, NamibiaGeochemistry
DS200712-0151
2006
Hansen, D.M.Cartwright, J., Hansen, D.M.Magma transport through the crust via inter connected sill complexes.Geology, Vol. 37, 11, pp. 929-932.MantleMagmatism, geophysics - seismics, sills
DS1983-0334
1983
Hansen, E.C.Jones, A.P., Smith, J.V., Dawson, J.B., Hansen, E.C.Metamorphism, Partial Melting, and K-metasomatism of Garnets capolite-kyanite Granulite Xenoliths from Lashaine, Tanzania.Journal of GEOLOGY, Vol. 91, No. 2, PP. 143- 166.Tanzania, East AfricaBlank
DS1999-0287
1999
Hansen, H.Hansen, H., Nielsen, T.F.D.Crustal contamination in Paleogene East Greenland flood basalts: plumbing system evolution during continental..Chemical Geology, Vol. 157, No. 1-2, May pp. 89-118.GreenlandTectonics - rifting, Basalts
DS201112-0558
2011
Hansen, H.Kullerud, K., Zozulya, D., Bergh, S.G., Hansen, H., Ravna, E.J.K.Geochemistry and tectonic setting of a lamproite dyke in Kvaloya, north Norway.Lithos, Vol. 126, pp. 278-289.Europe, NorwayLamproite
DS1989-0582
1989
Hansen, J.Hansen, J.A tensiometric study of diamond (111) and (110) facesJournal of Colloid and Interface Science, Vol. 130, No. 2, July pp. 347-358GlobalDiamond morphology
DS1989-1089
1989
Hansen, J.O.Napier-Munn, T.J., Reeves, T.J., Hansen, J.O.The monitoring of medium rheology in dense medium cyclone plantsAustralian Institute of Mining and Metallurgy (AusIMM) Bulletin Proceedings Vol, Vol. 294, No. 3, May pp. 85-94AustraliaMineral processing, Heavy minerals
DS1980-0157
1980
Hansen, K.Hansen, K.Lamprophyres and Carbonatitic Lamprophyres Related to Rifting in the Labrador Sea.Lithos, Vol. 13, PP. 145-152.GreenlandRelated Rocks
DS1984-0337
1984
Hansen, K.Hansen, K.Rare Earth Abundances in Mesozoic Undersaturated Alkaline Rocks from West Greenland.Lithos, Vol. 17, PP. 77-85.GreenlandRelated Rocks, Lamprophyre
DS2002-0651
2002
Hansen, K.Hansen, K., Brooks, C.K.The evolution of the East Greenland margin as revealed from fission track studiesTectonophysics, Vol. 349, No. 1-4, pp.93-111.GreenlandGeochronology, Tectonics
DS202011-2048
2020
Hansen, L.N.Kiraly, A., Conrad, C.P., Hansen, L.N.Evolving viscous anisotropy in the Upper mantle and its geodynamic implications.Geochemistry, Geophysics, Geosystems, 10.1029/ 2020GC009159 22p. PdfMantleolivine

Abstract: The uppermost layer of Earth's mantle, the asthenosphere, experiences large deformations due to a variety of tectonic processes. During deformation, grains of olivine, the main rock?forming mineral in the asthenosphere, rotate into a preferred direction parallel to the deformation, developing a texture that can affect the response of the asthenosphere to tectonic stresses. Laboratory measurements show that the deformation rate depends on the orientation of the shear stress relative to the olivine texture. We use numerical models to apply the findings of the laboratory measurements to geodynamic situations that are difficult to simulate in a laboratory. These models track the development of olivine texture and its directional response to shear stress, which are highly coupled. Our results suggest that anisotropic viscosity in the asthenosphere can significantly affect the motions of tectonic plates, as plate motion in a continuous direction should become faster, while abrupt changes in the direction of plate motion should meet high resistance in the underlying asthenosphere. We suggest that olivine textures in the asthenosphere play a critical role in upper mantle dynamics.
DS1985-0262
1985
Hansen, M.C.Hansen, M.C.Additional Notes on Ohio DiamondsOhio Geology Newsletter., WINTER PP. 1-4.United States, Ohio, Great LakesDiamond, History, Diamond Occurrence
DS1994-0710
1994
Hansen, M.C.Hansen, M.C.Return to Sunken Mountain: the Serpent mound cryptoexplosion structureOhio Geology, Winter, pp. 1, 3-7.GlobalCryptoexplosion
DS1992-0662
1992
Hansen, R.E.Hansen, R.E.Bedrock topography of southwest IowaUnited States Geological Survey (USGS) Map, I-2230, two sheets $ 3.50GlobalBedrock topography, Map
DS201809-2033
2018
Hansen, R.F.Hansen, R.F., Rennie, L.J.The first Australian diamond.The Australian Gemmologist, Vol. 26, 9-10, pp. 205-208.Australia, New South Wales diamond - Ophir

Abstract: This article describes the first Australian diamond to reach the shores of Britain. Originally donated to the Museum of Practical Geology, it now resides in the Natural History Museum, London. The diamond came from the gold-mining district of Ophir, near Bathurst in New South Wales, and is possibly the earliest found and recognised as a diamond in Australia.
DS200912-0278
2009
Hansen, S.E.Hansen, S.E., Nyblade, A.A., Jordi, J., Dirks, P.Upper mantle low velocity zone structure beneath the Kaapvaal craton from S wave receiver functions.Geophysical Journal International, Vol. 178, 2, pp. 1021-1027.Africa, South AfricaGeophysics - seismics
DS201212-0282
2012
Hansen, S.E.Hansen, S.E., Nyblade, A.A., Benoit, M.H.Mantle structure beneath Africa and Arabia from adaptively parameterized P-wave tomography: implications for the origin of Cenozoic Afro-Arabian tectonism.Earth and Planetary Science Letters, Vol. 319-320, pp. 23-34.AfricaCore, mantle boundary
DS201312-0360
2013
Hansen, S.M.Hansen, S.M., Dueker, K.G., Stachnik, J.C., Aster, R.C., Karlstrom, K.E.A rootless rockies support and lithospheric structure of the Colorado Rocky Mountains inferred from CREST and TA seismic data.Geochemistry, Geophysics, Geosystems: G3, Vol. 14, 8, pp. 2670-2695.United StatesGeophysics - seismics
DS200412-0785
2004
Hansen, T.M.Hansen, T.M., Balling, N.Upper mantle reflectors: modelling of seismic wavefield characteristics and tectonic implications.Geophysical Journal International, Vol. 157, 2, pp. 664-682.MantleGeophysics - seismics
DS1987-0273
1987
Hansen, U.Hansen, U., Yuen, D.A.Evolutionary structures in double diffusive convection in magma chambersGeophysical Research. Letters, Vol. 14, No. 11, November pp. 1099-1102GlobalBlank
DS1996-0593
1996
Hansen, U.Hansen, U., Yuen, D.Potential role played by viscous heating in thermal chemical convection In the outer core.Geochimica Et Cosmochimica Acta, Vol. 60, No. 7, pp. 1113-23.MantleDensity - core, Model
DS1997-0872
1997
Hansen, U.Olbertz, D., Wortel, M.J.R., Hansen, U.Trench migration and subduction zone geometryGeophysical Research. Letters, Vol. 24, No. 3, Feb. 1, pp. 221-224GlobalSubduction, Tectonics
DS1998-0573
1998
Hansen, U.Hansen, U.Dynamical transport processes in the Earth's mantleMineralogical Magazine, Goldschmidt abstract, Vol. 62A, p. 567-8.MantleGeodynamics, Geophysics - seismics
DS1998-1484
1998
Hansen, U.Trompert, R., Hansen, U.Mantle convection simulations with rheologies that generate plate likebehaviour.Nature, Vol. 395, No. 6703, Oct. 15, pp. 686-688.MantleSubduction, Plate
DS2000-0870
2000
Hansen, U.Schoofs, S., Trompert, R.A., Hansen, U.Thermochemical convection in and beneath intracratonic basins: onset and effects.Journal of Geophysical Research, Vol.105, No.11, Nov.10, pp.25567-86.MantleCraton - basins, Geothermometry
DS200412-1920
2004
Hansen, U.Stein, C., Schmalzl, J., Hansen, U.The effect of rheological parameters on plate behaviour in a self consistent model of mantle convection.Physics of the Earth and Planetary Interiors, Vol. 142, 3-4, pp. 225-255.MantleSubduction
DS200512-0399
2005
Hansen, U.Hansen, U.Generation and evolution of plumes in mantle-relevant scenarios.Chapman Conference held in Scotland August 28-Sept. 1 2005, 1p. abstractMantleMantle plume, core-mantle boundary
DS200612-0596
2005
Hansen, U.Hoink, T., Schmalzl, J., Hansen, U.Formation of compositional structures by sedimentation in vigorous convection.Physics of the Earth and Planetary Interiors, Vol. 153, 1-3, pp. 11-20.MantleConvection, tectonics
DS200612-1371
2006
Hansen, U.Stemmer, K., Harder, H., Hansen, U.A new method to simulate convection with strongly temperature and pressure dependent viscosity in a spherical shell: applications to the Earth's mantle.Physics of the Earth and Planetary Interiors, in press availableMantleGeothermometry, mantle convection, rheology
DS200712-0645
2006
Hansen, U.Loddoch, A., Stein, C., Hansen, U.Temporal variations in the covective style of planetary mantles.Earth and Planetary Science Letters, Vol. 251, 1-2, Nov. 15, pp. 79-89.MantleConvection
DS200812-1117
2008
Hansen, U.Stein, C., Hansen, U.Plate motions and the viscosity structure of the mantle? Insights from numerical modeling.Earth and Planetary Science Letters, Vol. 272, 1-2, pp. 29-40.MantleGeophysics - seismics
DS200812-1118
2008
Hansen, U.Stein, C., Hansen, U.Plate motions and the viscosity structure of the mantle - insights from numerical modelling.Earth and Planetary Science Letters, Vol. 272, 1-2, July 30, pp. 29-40.MantleGeophysics - seismics, tectonics
DS201312-0881
2013
Hansen, U.Stein, C., Hansen, U.Arrhemius rheology versus Frank-Kamenetskii rheology - implications for mantle dynamics.Geochemistry, Geophysics, Geosystems: G3, Vol. 14, 8, pp. 2757-2770.MantleRheology
DS201312-0882
2013
Hansen, U.Stein, C., Lowman, J.P., Hansen, U.The influence of mantle internal heating on lithospheric mobility: implications for super-Earths.Earth and Planetary Science Letters, Vol. 361, pp. 448-459.MantleConvection
DS201412-0884
2014
Hansen, U.Stein, C., Lowman, J.P., Hansen, U.A comparison of mantle convection models featuring plates.Geochemistry, Geophysics, Geosystems: G3, Vol. 15, 6, pp. 2689-2698.MantleConvection
DS1989-0583
1989
Hansen, V.L.Hansen, V.L.Structural and kinematic evolution of the Teslin suture zone, Yukon: recordof an ancient transpressionalmarginJournal of Structural Geology, Vol. 11, No. 6, pp. 717-733YukonStructure, Tectonics
DS1990-0653
1990
Hansen, V.L.Hansen, V.L.Yukon-Tanana terrane: a partial acquittalGeology, Vol. 18, No. 4, April pp. 365-369Yukon, AlaskaTectonics, Terranes -Yukon-Tanana
DS1991-0660
1991
Hansen, V.L.Hansen, V.L., Ave Lallemant, H.G., Oldow, J.S.Penrose Conference Report: Transpressional tectonics of convergent platemarginsGsa Today, Vol. 1, No. 4, April pp. 73, 76GlobalTectonics, Plate margins
DS1992-0663
1992
Hansen, V.L.Hansen, V.L.Backflow and margin parallel shear within an ancient subduction complexGeology, Vol. 20, No. 1, January pp. 71-74YukonTeslin suture zone, Subduction
DS200712-0411
2007
Hansen, V.L.Hansen, V.L.Subduction origin on early Earth: a hypothesis.Geology, Vol. 35, 12 Dec. pp. 1059-1062.MantleSubduction
DS201511-1839
2015
Hansen, V.L.Hansen, V.L.Impact origin of Archean cratons.Lithosphere, Vol. 7, pp. 563-578,MantleImpacts

Abstract: Earth was a completely different planet more than 2.5 billion years ago. Little is known about this critical time when cratonic continental seeds formed; life emerged; and precious mineral resources concentrated. Our knowledge is limited because plate tectonic processes destroyed most of this early record. In contrast, Earth's sister, Venus -- similar in size, density, bulk composition, and distance from the Sun -- never developed plate tectonics. Venus also lacks a water cycle. Like siblings, Venus and Earth were most similar in their youth; however, Venus preserves a more complete geological record of its infancy, including both exogenic and endogenic features. Applying clues from Venus, Vicky L. Hansen proposes a new hypothesis for the formation of Earth's cratons. Large bolides pierced early thin lithosphere causing massive partial melting in the ductile mantle; melt escaped upward, forming cratonic crust; meanwhile strong, dry, buoyant melt residue formed cratonic roots, serving as unique buoyant life preservers during future plate-tectonic recycling.
DS201908-1777
2015
Hansen, V.L.Hansen, V.L.Impact origin of Archean cratons. ** Note date STEP faults ( lherzolite and wehrlite)Lithosphere, Vol. 7, 5, pp. 563-578Globalsubduction

Abstract: Archean cratons consist of crustal granite-greenstone terrains (GGTs) coupled to roots of strong, buoyant cratonic lithospheric mantle (CLM). Although this association is unique to the Archean and formed from ca. 4.0 to 2.5 Ga, the origins of terrestrial cratons are debated. I propose that crustal plateaus, quasi-circular craton-like features (?1400-2400 km diameter, 0.5-4 km high), on Earth’s sister planet Venus might serve as analogs for Archean cratons. Crustal plateaus, which are isostatically supported by a compositionally controlled low-density root, host a distinctive surface called ribbon-tessera terrain. Ribbon-tessera also occurs as arcuate-shaped inliers in the Venus lowlands, widely interpreted as remnants of rootless crustal plateaus. Within each crustal plateau, surface ribbon-tessera terrain comprises a vast igneous province analogous to terrestrial GGTs, and the plateau root is analogous to CLM. Crustal plateaus and ribbon-tessera terrain collectively represent Venus’ oldest preserved features and surfaces, and they formed during an ancient period of globally thin lithosphere. To explain the linked features of crustal plateaus, a bolide impact hypothesis has been proposed in which a large bolide pierces ancient thin lithosphere, leading to massive partial melting in the sublithospheric mantle. In this model, melt escapes to the surface, forming an enormous lava pond, which evolves to form ribbon-tessera terrain; mantle melt residue forms a strong, resilient buoyant root, leading to plateau support and long-term stability of an individual crustal plateau. Building on the similarity of GGT-CLM and Venus crustal plateaus, I propose an exogenic hypothesis for Archean craton formation in which a large bolide pierces thin Archean lithosphere, causing localized high-temperature, high-fraction partial melting in the sublithospheric mantle; melt rises, forming an igneous province that evolves to form a GGT, and melt residue develops a complementary CLM. By this mechanism, Archean cratons may have formed in a spatially and temporally punctuated fashion at a time when large bolides showered Archean Earth.
DS1984-0338
1984
Hansen, W.R.Hansen, W.R.Post Laramide Tectonic History of the Eastern Uinta Mountains, Utah, Colorado, and Wyoming.The Mountain Geologist., Vol. 21, No. 1, JANUARY PP. 5-29.United States, Colorado, Utah, Wyoming, Rocky MountainsTectonics
DS201904-0745
2019
Hansen-Goos, H.Honing, D., Tosi, N., Hansen-Goos, H., Spohn, T.Bifurcation in the growth of continental crust. (Water-land ratio)Physics of the Earth and Planetary Interiors, Vol. 287, pp. 37-50.Mantleplate tectonics

Abstract: Is the present-day water-land ratio a necessary outcome of the evolution of plate tectonic planets with a similar age, volume, mass, and total water inventory as the Earth? This would be the case - largely independent of initial conditions - if Earth’s present-day continental volume were at a stable unique equilibrium with strong self-regulating mechanisms of continental growth steering the evolution to this state. In this paper, we question this conjecture. Instead we suggest that positive feedbacks in the plate tectonics model of continental production and erosion may dominate and show that such a model can explain the history of continental growth. We investigate the main mechanisms that contribute to the growth of the volume of the continental crust. In particular, we analyze the effect of the oceanic plate speed, depending on the area and thickness of thermally insulating continents, on production and erosion mechanisms. Effects that cause larger continental production rates for larger values of continental volume are positive feedbacks. In contrast, negative feedbacks act to stabilize the continental volume. They are provided by the increase of the rate of surface erosion, subduction erosion, and crustal delamination with the continental volume. We systematically analyze the strengths of positive and negative feedback contributions to the growth of the continental crust. Although the strengths of some feedbacks depend on poorly known parameters, we conclude that a net predominance of positive feedbacks is plausible. We explore the effect of the combined feedback strength on the feasibility of modeling the observed small positive net continental growth rate over the past 2-3 billion years. We show that a model with dominating positive feedbacks can readily explain this observation in spite of the cooling of the Earth’s mantle acting to reduce the continental production rate. In contrast, explaining this observation using a model with dominating negative feedbacks would require the continental erosion and production rates to both have the same or a sufficiently similar functional dependence on the thermal state of the mantle, which appears unreasonable considering erosion to be largely dominated by the surface relief and weathering. The suggested scenario of dominating positive feedbacks implies that the present volume of the continental crust and its evolution are strongly determined by initial conditions. Therefore, exoplanets with Earth-like masses and total water inventories may substantially differ from the Earth with respect to their relative land/surface ratios and their habitability.
DS1991-0661
1991
Hanski, E.Hanski, E., Huhma, H., Smolkin, V.F., Vaasjoki, M.The age of the ferropicritic volcanics and comagmatic nickel-bearing intrusion sat Pechenga, Kola Peninsula, U.S.S.R.Bulletin. Geological Society Finland, Vol. 62, pt. 2, pp. 123-133FinlandNickel, Pechenga
DS2001-0443
2001
Hanski, E.Hanski, E., Huhma, H., Rastas, P., Kamenetsky, V.S.The Paleoproterozoic komatiite picrite association of Finnish LaplandJournal of Petrology, Vol. 42, No. 5, pp. 855-76.Finland, LaplandPicrites, Petrology
DS201312-0361
2013
Hanski, E.Hanski, E., Kamenetsky, V.S.Chrome spinel hosted melt inclusions in Paleoproterozoic primitive volcanic rocks, northern Finland: evidence for coexistence and mixing of komatiitic and picritic magmas.Chemical Geology, Vol. 343, pp. 25-37.Europe, FinlandMagmatism, melting
DS202108-1273
2021
Hanski, E.Barnes, S.J., Williams, M., Smithies, R.H., Hanski, E., Lowrey, J.R.Trace element contents of mantle derived magmas through time.Mineralium Deposita, Vol. 56, pp. 1133-1150.Mantlemagmatism

Abstract: A large compilation of quality-curated major and trace element data has been assembled to investigate how trace element patterns of mafic and ultramafic magmas have varied with time through particular settings from the Archean to the Phanerozoic, the primary objective being to recognise at what times particular patterns of variation emerge, and how similar these are to baseline data sets representing tectonic settings in the modern Earth. The most informative element combinations involve Nb, Th and the REE, where REE are represented by ‘lambda’ parameters describing slope and shape of patterns. Combinations of the ratios of Th, Nb, La and lambda values from Archean and early Proterozoic basalts and komatiites reveal a distinctive pattern that is common in most well-sampled terranes, defining a roughly linear trend in multi-dimensional space from compositions intermediate between modern n-MORB and primitive mantle at one end, towards compositions approximating middle-to-upper continental crust at the other. We ascribe this ‘Variable Th/Nb’ trend in most instances to varying degrees of crustal contamination of magmas with similar compositions to modern oceanic plateau basalts. Komatiites had slightly more depleted sources than basalts, consistent with the hypothesis of derivation from plume tails and heads, respectively. The most significant difference between Precambrian and Phanerozoic plume-derived basalts is that the distinctive OIB-like enriched source component appears to be largely missing from the Archean and Proterozoic geologic record, although isolated examples of OIB-like trace element characteristics are evident in datasets from even the oldest preserved greenstones. Phanerozoic intra-cratonic LIPs, such as the 260?Ma Emeishan LIP in China, have fundamentally different geochemical characteristics to Archean and Paleoproterozoic assemblages; the oldest Proterozoic LIP we have identified that has this type of ‘modern’ signal is the Midcontinent Rift at 1100?Ma. The data are consistent with plume tail sources having changed from being dominantly depleted in the Archean Earth to dominantly enriched in the Phanerozoic Earth, while plume head sources have hardly changed at all. Trace element patterns considered to be diagnostic of subduction are locally present but rare in Archean terranes and become more prevalent through the Proterozoic, although this conclusion is tempered by the large degree of overlap in compositional space between continental arc magmas and continental flood basalts. This overlap reflects the difficulty of distinguishing the effects of supra-subduction metasomatizm and flux melting from those of crustal contamination. Additional factors must also be borne in mind, particularly that trace element partitioning systematics may have been different in all environments in a hotter planet, and large-scale asthenospheric overturns might have been predominant over modern-style plumes in the Archean Earth. Some basaltic suites in particular Archean terranes, notably the western parts of both the Yilgarn and Pilbara cratons in Western Australia and parts of the Superior Craton, have restricted, but locally predominant, suites of basalts with characteristics akin to modern oceanic arcs, suggesting that some process similar to modern subduction was preserved in these particular belts. Ferropicrite magmas with distinctive characteristics typical of modern OIBs and some continental LIPs (notably Emeishan) are rare but locally predominant in some Archean and early Proterozoic terranes, implying that plume sources were beginning to be fertilised by enriched, probably subducted, components as far back as the Mesoarchean. We see no evidence for discontinuous secular changes in mantle-derived magmatism with time that could be ascribed to major mantle reorganisation events. The Archean-Proterozoic transition appears to be entirely gradational from this standpoint. The transition from Archean-style to Phanerozoic-style plume magmatism took place somewhere between 1900?Ma (age of the Circum-Superior komatiitic basalt suites) and 1100?Ma (the age of the Midcontinent Rift LIP).
DS1989-0584
1989
Hanski, E.J.Hanski, E.J., Smolkin, V.F.Pechenga ferropicrites and other early Proterozoic picrites in the eastern part of the Baltic shieldPrecambrian Research, Vol. 45, No. 1-3, November pp. 63-82Finland, RussiaPicrites
DS1995-0743
1995
Hanski, E.J.Hanski, E.J., Smolkin, V.F.Iron and light rare earth element (LREE) enriched mantle source for early Proterozoic intraplate magmatism-Pechenga picroilmeniteLithos, Vol. 34, No. 1-3, Jan. pp. 107-126Russia, SiberiaMagmatism, Mantle source
DS1997-1221
1997
Hanski, E.J.Walker, R.J., Morgan, J.W., Hanski, E.J., Smolkin, V.F.Rhenium- Osmium (Re-Os) systematics of Early Proterozoic ferropicrites, Pechenga Russia: evidence for ancient plumes.Geochimica et Cosmochimica Acta, Vol. 61, No. 15, pp. 3145-60Russia, Kola PeninsulaGeochemistry, geochronology, layered intrusion, Pechenga Complex
DS200412-0696
2004
Hanski, E.J.Gornostayev, S.S., Walker, R.J., Hanski, E.J., Popovchenko, S.E.Evidence for the emplacement of ca. 3.0 Ga mantle derived mafic ultramafic bodies in the Ukrainian Shield.Precambrian Research, Vol. 132, 4, July 15, pp.349-362.Europe, UkraineTectonics, chromitite
DS201904-0761
2019
Hanski, M.Nicklas, R.W., Puchtel, I.S., Ash, R.D., Piccoli, P.M., Hanski, M., Eero, Nisbet, E.G., Waterton, P., Pearson, D.G., Anbar, A.D.Secular mantle oxidation across the Archean - Proterozoic boundary: evidence from V partitioning in komatiites and picrites.Geochimica et Cosmochimica Acta, Vol. 250, 1, pp. 49-75.Mantlepicrites

Abstract: The oxygen fugacities of nine mantle-derived komatiitic and picritic systems ranging in age from 3.55?Ga to modern day were determined using the redox-sensitive partitioning of V between liquidus olivine and komatiitic/picritic melt. The combined set of the oxygen fugacity data for seven systems from this study and the six komatiite systems studied by Nicklas et al. (2018), all of which likely represent large regions of the mantle, defines a well-constrained trend indicating an increase in oxygen fugacity of the lavas of ?1.3 ?FMQ log units from 3.48 to 1.87?Ga, and a nearly constant oxygen fugacity from 1.87?Ga to the present. The oxygen fugacity data for the 3.55?Ga Schapenburg komatiite system, the mantle source region of which was previously argued to have been isolated from mantle convection within the first 30?Ma of the Solar System history, plot well above the trend and were not included in the regression. These komatiite’s anomalously high oxygen fugacity data likely reflect preservation of early-formed magma ocean redox heterogeneities until at least the Paleoarchean. The observed increase in the oxygen fugacity of the studied komatiite and picrite systems of ?1.3 ?FMQ log units is shown to be a feature of their mantle source regions and is interpreted to indicate secular oxidation of the mantle between 3.48 and 1.87?Ga. Three mechanisms are considered to account for the observed change in the redox state of the mantle: (1) recycling of altered oceanic crust, (2) venting of oxygen from the core due to inner core crystallization, and (3) convection-driven homogenization of an initially redox-heterogeneous primordial mantle. It is demonstrated that none of the three mechanisms alone can fully explain the observed trend, although mechanism (3) is best supported by the available geochemical data. These new data provide further evidence for mantle involvement in the dramatic increase in the oxygen concentration of the atmosphere leading up to the Great Oxidation Event at ?2.4?Ga.
DS2001-0720
2001
HansonMajaule, T., Hanson, Key, Singletary, Martin, BowringThe Magondi belt in northeast Botswana: regional relations and new geochronological dat a from Sua PanJournal of African Earth Sciences, Vol. 32, No. 2, pp. 257-67.BotswanaOrogeny, Geochronology - mentions diamond area
DS1995-0744
1995
Hanson, A.Hanson, A., et al.Discovery of eclogite blocks in the Altun Mountains, southeast Tarim northwestChina.Eos, Abstracts, Vol. 76, No. 17, Apr 25, p. S 283.ChinaEclogite
DS200412-2166
2004
Hanson, A.D.Yan, Q., Hanson, A.D., Wang, Z., Druschke, P.A., Yan, Z., Wan, T.Neoproterozoic subduction and rifting on the northern margin of the Yangtze Platform: Redonia reconstruction.International Geology Review, Vol.46, 9, Sept. pp. 817-832.ChinaSubduction
DS201312-0362
2012
Hanson, B.Hanson, B.A map of Earth's rocks.Science, Vol. 338, 6114, Dec. 21, p. 1512.GlobalMap
DS2001-0378
2001
Hanson, B.M.Gerhard, L.C., Harrison, W.E., Hanson, B.M.Introduction and overview of global climate changeAmerican Association of Petroleum Geologists (AAPG) Book, pp.1-15.GlobalClimatology - brief overview
DS1980-0158
1980
Hanson, C.G.Hanson, C.G.Geochemical and Mineralogical Investigations of Methods For detecting Kimberlites in the Area of the Stockdale Kimberlite, Riley County, Kansas.Msc. Thesis, Penn. State University, 116P.United States, Kansas, Central StatesProspecting
DS200612-0526
2006
Hanson, E.K.Hanson, E.K., Moore, J.M., Robey, J., Bordy, E.M., Marsh, J.S.Re-estimation of erosion levels in Group I and II kimberlites between Lesotho, Kimberley and Victoria West, South Africa.Emplacement Workshop held September, 5p. extended abstractAfrica, South Africa, LesothoCrustal xenoliths
DS201012-0266
2009
Hanson, E.K.Hanson, E.K., Moore, J.M., Bordy, E.M., Marsh, J.S., Howarth, G., Robey, J.V.A.Cretaceous erosion in central South Africa: evidence from upper crustal xenoliths in kimberlite diatremes.South African Journal of Geology, Vol. 112, 2, pp. 125-140.Africa, South AfricaGeomorphology
DS1989-1455
1989
Hanson, G.N.Stern, R.A., Hanson, G.N., Shirey, S.B.Petrogenesis of mantle derived large-ion lithophile elements (LILE) enriched Archean monzodiorites and Trachy andesites (sanukitoids) in southwestern Superior ProvinceCanadian Journal of Earth Sciences, Vol. 26, No. 9, September pp. 1688-1712OntarioPetrology, Archean, shosonites
DS1993-1278
1993
Hanson, G.N.Rajamani, V., Balakrishnan, S., Hanson, G.N.Komatiite genesis: insights provided by iron-magnesium exchange equilibriaJournal of Geology, Vol. 101, No. 6, November pp. 809-819IndiaKomatiite, Archean, Kolar Schist Belt, Genesis
DS1999-0041
1999
Hanson, G.N.Balakrishnan, S., Rajamani, V., Hanson, G.N.uranium-lead (U-Pb) ages for zircon and titanite from the Ramagiri area, evidence for accretionary origin ....Late ArcheanJournal of Geology, Vol. 107, No.1, Jan. pp. 69-86.India, South IndiaGeochronology, Dharwar Craton
DS2002-0780
2002
Hanson, H.Jensen, S.M., Hanson, H., Secher, K., Steenfelt, A., Schjoth, F., Rasmussen, T.M.Kimberlites and other ultramafic alkaline rocks in the Sismiut-Kangerfussuaq region, southwest Greenland.Geology of Greenland Survey Bulletin, No. 191, pp. 57-66.GreenlandDistribution and magnetic signatures of dykes
DS1996-0573
1996
Hanson, R.Grunow, A., Hanson, R., Wilson, T.Were aspects of Pan-African deformation linked to Iapetus opening?Geology, Vol. 24, No. 12, Dec. pp. 1063-66.Africa, South America, IndiaTectonics, Paleomagnetics
DS2002-0652
2002
Hanson, R.Hanson, R., Pancake, J., Crowley, J., Ramezani, Bowring, Dalziel, GoseCorrelation of 1.1 GA large igneous provinces on the Laurentia and Kalahari Cratons:Geological Society of America Annual Meeting Oct. 27-30, Abstract p. 561.South Africa, Botswana, Zimbabwe, OntarioTectonics, Gondwana
DS201012-0629
2010
Hanson, R.Rioux, M.,Bowring, S., Dudas, F., Hanson, R.Characterizing the U-Pb systematics of baddeleyite through chemical abrasion: application of multi-step digestion methods to baddelyite geochronology.Contributions to Mineralogy and Petrology, in press available 25p.Africa, South AfricaCarbonatite, Phalaborwa
DS201811-2605
2018
Hanson, R.Salminen, J., Hanson, R., Evans, D.A.D., Gong, Z., Larson, T., Walker, O., Gumsley, A., Soderlund, U., Ernst, T.Direct Mesoproterozoic connection of the Congo and Kalahari cratons in proto-Africa: strange attractors across supercontinental cycles.Geology, doi.org/10.1130/G45294.1 4p.Africacraton

Abstract: Mobilistic plate-tectonic interpretation of Precambrian orogens requires that two conjoined crustal blocks may derive from distant portions of the globe. Nonetheless, many proposed Precambrian cratonic juxtapositions are broadly similar to those of younger times (so-called “strange attractors”), raising the specter of bias in their construction. We evaluated the possibility that the Congo and Kalahari cratons (Africa) were joined together prior to their amalgamation along the Damara-Lufilian-Zambezi orogen in Cambrian time by studying diabase dikes of the Huila-Epembe swarm and sills in the southern part of the Congo craton in Angola and in Namibia. We present geologic, U-Pb geochronologic, and paleomagnetic evidence showing that these two cratons were directly juxtaposed at ca. 1.1 Ga, but in a slightly modified relative orientation compared to today. Recurring persistence in cratonic connections, with slight variations from one supercontinent to the next, may signify a style of supercontinental transition similar to the northward motion of Gondwana fragments across the Tethys-Indian oceanic tract, reuniting in Eurasia.
DS201902-0316
2019
Hanson, R.Salminen, J., Hanson, R., Evans, D.A.D., Gong, Z., Larson, T., Walker, O., Gumsley, A., Soderlund, U., Ernst, R.Direct Mesoproterozoic connection of the Congo and Kalahari cratons in proto-Africa: strange attractors across supercontinental cycles.Geology, Vol. 46, pp. 1101-1104.Africa, Angola, Namibiacraton

Abstract: Mobilistic plate-tectonic interpretation of Precambrian orogens requires that two conjoined crustal blocks may derive from distant portions of the globe. Nonetheless, many proposed Precambrian cratonic juxtapositions are broadly similar to those of younger times (so-called “strange attractors”), raising the specter of bias in their construction. We evaluated the possibility that the Congo and Kalahari cratons (Africa) were joined together prior to their amalgamation along the Damara-Lufilian-Zambezi orogen in Cambrian time by studying diabase dikes of the Huila-Epembe swarm and sills in the southern part of the Congo craton in Angola and in Namibia. We present geologic, U-Pb geochronologic, and paleomagnetic evidence showing that these two cratons were directly juxtaposed at ca. 1.1 Ga, but in a slightly modified relative orientation compared to today. Recurring persistence in cratonic connections, with slight variations from one supercontinent to the next, may signify a style of supercontinental transition similar to the northward motion of Gondwana fragments across the Tethys-Indian oceanic tract, reuniting in Eurasia.
DS1989-0086
1989
Hanson, R.B.Barton, M.D., Hanson, R.B.Magmatism and the development of low pressure metamorphic belts:implications from the western United States and thermal modelingGeological Society of America Bulletin, Vol. 101, No. 8, August pp. 1051-1065NevadaMagmatism, Tectonics
DS1992-0664
1992
Hanson, R.B.Hanson, R.B.Effects of fluid production on fluid flow during regional and contactmetamorphismJournal of Metamorphic Geology, Vol. 10, No. 1, January pp. 87-98Globalmetamorphism, Fluid flow
DS1995-0745
1995
Hanson, R.B.Hanson, R.B.The hydrodynamics of contact metamorphismGeological Society of America (GSA) Bulletin, Vol. 107, No. 5, May pp. 595-611Globalmetamorphism, Hydrodynamics - review
DS1997-0473
1997
Hanson, R.B.Hanson, R.B.Hydrodynamics of regional metamorphism due to continental collisionEcon. Geology, Vol. 92, No. 7/8 Nov-Dec pp. 880-891GlobalHydrothermal, Geodynamics, tectonics
DS1989-0585
1989
Hanson, R.E.Hanson, R.E.The late Proterozoic Zambezi belt in southern Africa: a model for the deeper levels of the southern Oklahoma aulacogenGeological Society of America (GSA) Abstract Volume, Vol. 20, No. 2, p. 13, (abstract.)GlobalTectonics
DS1994-0711
1994
Hanson, R.E.Hanson, R.E., Wilson, T.J., Munyanyiwa, H.Geologic evolution of the Neoproterozoic Zambezi orogenic belt in ZambiaJournal of African Earth Sciences, Vol. 18, No. 2, February pp. 135-150ZambiaTectonics, Zambezi belt
DS1997-0828
1997
Hanson, R.E.Munyanyiwa, H., Hanson, R.E., Treloar, P.J.Geochemistry of amphibolites and quartzofeldspathic gneisses in the Pan-African Zambezi beltPrecambrian Research, Vol. 81. No. 3-4, Feb. 1, pp. 179-196ZimbabweMagmatism, Tectonics, continental rift setting
DS1997-1263
1997
Hanson, R.E.Wilson, T.J., Grunow, A.M., Hanson, R.E.Gondwana assembly: the view from southern Africa and East GondwanaJournal of Geodynamics, Vol. 23, No. 3-4, pp. 263-286.Africa, South AfricaTectonics, Terranes
DS1998-0574
1998
Hanson, R.E.Hanson, R.E., Martin, M.W., Bowring, S.A., Munyanyiwauranium-lead (U-Pb) zircon age for Umkondo dolerites, eastern Zimbabwe: 1.1 Ga large igneous province ....Geology, Vol. 26, No. 12, Dec. pp. 1143-6.Zimbabwe, South Africa, AntarcticaGeochronology, Rodinia, Gondwana, Magmatism
DS2000-0386
2000
Hanson, R.E.Hanson, R.E.Overview of the Neoproterozoic tectonic evolution of southern AfricaGeological Society of America (GSA) Abstracts, Vol. 32, No. 7, p.A-247.Southern Africa, Tanzania, BotswanaOrogeny - Pan African, Craton - Congo, Kalahari
DS2001-1203
2001
Hanson, R.E.Vinyu, M.L., Hanson, R.E., Martin, M.W., Bowringuranium-lead (U-Pb) zircon ages from craton margin Archean orogenic belt in northern Zimbabwe.Journal of African Earth Sciences, Vol. 32, No. 1, Jan. pp. 103-114.ZimbabweCraton, Geochronology
DS2003-0550
2003
Hanson, R.E.Hanson, R.E.Proterozoic geochronology and tectonic evolution of southern AfricaGeological Society of London, Special Publication, No. 206, pp. 427-63.South AfricaTectonics
DS2003-0551
2003
Hanson, R.E.Hargrove, U.S., Hanson, R.E., Martin, M.W., Blenkinsop, T.G., Bowring, S.A.Tectonic evolution of the Zambesi orogenic belt: geochronological, structural andPrecambrian Research, Vol. 123, 2-4, pp. 159-186.ZimbabweBlank
DS2003-1287
2003
Hanson, R.E.Singletary, S.J., Hanson, R.E., Martin, M.W., Crowley, J.L., Bowring, S.A., KeyGeochronology of basement rocks in the Kalahari desert, Botswana, and implicationsPrecambrian Research, Vol. 121,1-2, Feb. 28, pp. 47-71.BotswanaGeochronology, Crustal provinces, belts - not specific to diamonds
DS200412-0786
2003
Hanson, R.E.Hanson, R.E.Proterozoic geochronology and tectonic evolution of southern Africa.Proterozoic East Gondwana: Supercontinent assembly and Breakup. Ed. Yoshida , Geological Society of London Spe, No. 206, pp. 427-56.Africa, South Africa, BotswanaPlume, tectonics
DS200412-0787
2004
Hanson, R.E.Hanson, R.E., Crowley, J.L., Bowring, S.A., et al.Coeval large scale magmatism in the Kalahari and Laurentian cratons during Rodinia assembly.Science, Vol. 304, 5674, May 21, pp.Africa, South AfricaMagmatism
DS200412-0788
2004
Hanson, R.E.Hanson, R.E., Gose, W.A., Crowley, J.L., Ramezani, J., Bowring, S.A., Bullen, D.S., Hall, R.P., Pancake, J.A.Paleoproterozoic intraplate magmatism and basin development on the Kaapvaal Craton: age, paleomagnetism and geochemistry of 1.93South African Journal of Geology, Vol. 107, 1/2, pp. 233-254.Africa, South AfricaCraton, tectonics, magmatism
DS200412-0790
2003
Hanson, R.E.Hargrove, U.S., Hanson, R.E., Martin, M.W., Blenkinsop, T.G., Bowring, S.A., Walker, N., Munyanyiwa, H.Tectonic evolution of the Zambesi orogenic belt: geochronological, structural and petrological constraints from northern ZimbabwPrecambrian Research, Vol. 123, 2-4, pp. 159-186.Africa, ZimbabweTectonics
DS200612-0527
2006
Hanson, R.E.Hanson, R.E., Harmer, R.E., Blenkinsop, T.G., Bullen, D.S., Dalziel, Gose, Hall, Kampunzu, Key, MukwakwamiMesoproterozoic intraplate magmatism in the Kalahari Craton: a review.Journal of African Earth Sciences, Vol. 46, 1-2, pp. 141-167.Africa, South AfricaMagmatism
DS200612-0528
2006
Hanson, R.E.Hanson, R.E., Harmer,Blenkinsop, Bullen, Dalziel, Gose, Hall, Kampunzu, Key, Mukwakwami, Munyaniwa, Pancake, Seidel, WardMesoproterozoic intraplate magmatism in the Kalahari Craton: a review.Journal of African Earth Sciences, In press available,Africa, South AfricaAlkaline rocks, carbonatite, Premier kimberlite cluster
DS201112-0410
2011
Hanson, R.E.Hanson, R.E., Rioux, M., Gose, W.A., Blackburn, T.J., Bowring, S.A., Mukwakwami, J., Jones, D.L.Paleomagnetic and geochronological evidence for large scale post 1.88 Ga displacement between Zimbabwe and Kaapvaal Cratons along the Limpopo belt.Geology, Vol.39, 5, pp. 487-490.Africa, South Africa, ZimbabweGeochronology
DS201312-0328
2013
Hanson, R.E.Gose, W.A., Hanson, R.E., Harmer, R.E., Seidel, E.K.Reconnaissance paleomagnetic studies of Mesoproterozoic alkaline igneous complexes in the Kaapvaal craton, South Africa.Journal of African Earth Sciences, Vol. 85, pp. 22-30.Africa, South AfricaGeophysics - magnetics
DS1989-1014
1989
Hanson, S.L.Meurer, W.P., Falster, A.U., Simmons, W.B., Hanson, S.L., Rog, A.M.Trace mineralogy of the Magnet Cove carbonatite, ArkansawSixteenth Rochester Mineralogical Symposium, Rocks and Minerals, held April, Vol. 64, No. 6, December p. 473. Summary onlyArkansasCarbonatite, Magnet Cove
DS200412-0681
2004
Hanson, U.Goes, S., Cammarano, F., Hanson, U.Synthetic seismic signature of thermal mantle plumes.Earth and Planetary Science Letters, Vol. 218, 3, Feb. 15, pp. 403-419.MantleGeochronology
DS1991-0662
1991
Hansteen, T.H.Hansteen, T.H.Multi-stage evolution of the picritic Maelifell rocks, southwest Iceland:constraints from mineralogy and inclusions of glass and fluid in olivineContributions to Mineralogy and Petrology, Vol. 109, pp. 223-239GlobalPicrites, Mineralogy
DS1998-0575
1998
Hanstock, T.J.Hanstock, T.J., Levander, A.R., Snelson, C.M., et al.The deep probe experiments: continent scale active source seismic profilingAmerican Geophysical Union (AGU) Annual Meeting, Vol 79, No. 17, p. 229. abstract.Alberta, Montana, Colorado PlateauGeophysics - seismics
DS1992-1516
1992
Hantz, D.Tanays, E., Cojean, R., Hantz, D.DEGRES: a software to design open pit geometry and to draw open pit plansInternational Journal of Surface Mining and Reclamation, Vol. 6, pp. 91-98GlobalComputer, Program -DEGRES
DS2003-1190
2003
Hanuma Prasad, M.Roy, A., Hanuma Prasad, M.Tectonothermal events in Central Indian Tectonic Zone ( CITZ) and its implications inJournal of Asian Earth Sciences, Vol. 22, 2, pp. 115-129.IndiaTectonics, Geothermometry
DS200412-1695
2003
Hanuma Prasad, M.Roy, A., Hanuma Prasad, M.Tectonothermal events in Central Indian Tectonic Zone ( CITZ) and its implications in Rodinian crustal assembly.Journal of Asian Earth Sciences, Vol. 22, 2, pp. 115-129.IndiaTectonics, Geothermometry
DS200612-0238
2005
Hanuma Prasad, M.Chalapathi Rao, N.V., Hanuma Prasad, M., Vasudev, V.N.Archean primary source for the diamonds in the Wairagarh area, Garchiroli district, Maharashira.Geological Society of India, Bangalore November Meeting Group Discussion on Kimberlites and Related Rocks India, Abstract p. 107-112.India, Bastar CratonDiamond genesis
DS1991-0663
1991
Hanus, V.Hanus, V., Vanek, J.Paleoplates buried in the upper mantle and the cyclic character ofsubductionJournal of Geodynamics, Vol. 13, No. 1, No. 2-4, pp. 29-45South America, AndesGeophysics -seismics, Mantle, tectonics
DS1994-1839
1994
Hanus, V.Vanek, J., Vankova, V., Hanus, V.Geochemical zonation of volcanic rocks and deep structure of Ecuador and southern ColombiaJournal of South American Earth Sciences, Vol. 7, No. 1, pp. 57-67GlobalGeochemistry, Tectonics, Structure
DS1996-0594
1996
Hanus, V.Hanus, V., Vanek, J.Cyclic evolution of convergent plate margins indicated by time sequence of volcanism and subductionGlobal Tectonics and Metallogeny, Vol. 5, No. 3-4, p. 103-108AndesWadati-Benioff zone, volcanism.
DS1998-0576
1998
Hanyu, T.Hanyu, T., Kaneoka, I.Helium open system model for the HIMU sourceMineralogical Magazine, Goldschmidt abstract, Vol. 62A, p. 569-70.GlobalSubduction - not specific to diamonds
DS2001-0444
2001
Hanyu, T.Hanyu, T., Dunai, T.J., Davies, G.R., Kaneoka, I.Noble gas study of the Reunion hotspot: evidence for distinct less degassed mantle sources.Earth and Planetary Science Letters, Vol. 193, No. 1-2, pp. 83-98.Mauritius, MantleGeochronology, hot spots, degassing
DS201412-0922
2013
Hanyu, T.Tatsumi, Y., Suzuki, T., Ozawa, H., Hirose, K., Hanyu, T., Ohishi, Y.Accumulation of 'anti-continent' at the base of the mantle and its recycling in mantle plumes.Geochimica et Cosmochimica Acta, in press availableMantleD layer
DS201610-1917
2016
Hanyu, T.Weiss, Y., Class, C., Goldstein, S.L., Hanyu, T.Key new pieces of the HIMU puzzle from olivines and diamond inclusions.Nature, On line Sept. 5, 11p.MantleMelting

Abstract: Mantle melting, which leads to the formation of oceanic and continental crust, together with crust recycling through plate tectonics, are the primary processes that drive the chemical differentiation of the silicate Earth. The present-day mantle, as sampled by oceanic basalts, shows large chemical and isotopic variability bounded by a few end-member compositions1. Among these, the HIMU end-member (having a high U/Pb ratio, ?) has been generally considered to represent subducted/recycled basaltic oceanic crust2, 3, 4, 5. However, this concept has been challenged by recent studies of the mantle source of HIMU magmas. For example, analyses of olivine phenocrysts in HIMU lavas indicate derivation from the partial melting of peridotite, rather than from the pyroxenitic remnants of recycled oceanic basalt6. Here we report data that elucidate the source of these lavas: high-precision trace-element analyses of olivine phenocrysts point to peridotite that has been metasomatized by carbonatite fluids. Moreover, similarities in the trace-element patterns of carbonatitic melt inclusions in diamonds7 and HIMU lavas indicate that the metasomatism occurred in the subcontinental lithospheric mantle, fused to the base of the continental crust and isolated from mantle convection. Taking into account evidence from sulfur isotope data8 for Archean to early Proterozoic surface material in the deep HIMU mantle source, a multi-stage evolution is revealed for the HIMU end-member, spanning more than half of Earth’s history. Before entrainment in the convecting mantle, storage in a boundary layer, upwelling as a mantle plume and partial melting to become ocean island basalt, the HIMU source formed as Archean-early Proterozoic subduction-related carbonatite-metasomatized subcontinental lithospheric mantle.
DS201610-1918
2016
Hanyu, T.Weiss, Y., Class, C., Goldstein, S.L., Hanyu, T.Some islands started in diamond bearing regions under continents, geochemists say. Precis of Nature ref.Ideo.Columbia.edu, On line Sept. 5, 3p.MantleHIMU

Abstract: The raw materials of some volcanic islands are shaped by some of the same processes that form diamonds deep under the continents, according to a new study. The study asserts that material from diamond-forming regions journeys nearly to Earth's core and back up to form such islands, a process that could take two and a half billion years or longer -- more than half of Earth's entire history.
DS201012-0831
2010
Hao, J.Wang, L., Zhao, Y., Ding, J., Hao, J.,Ma, L.J., Zhang, L.X.Macrocrystal garnet and its inclusions in kimberlite pipes from the Mengyin area, Shandong Province, China.Acta Geologica Sinica, Vol. 84, 1, pp. 167-177.ChinaDeposit - Mengyin
DS201504-0229
2015
Hao, J.Wang, Y., Santosh, M., Lou, Z., Hao, J.Large igneous provinces linked to supercontinent assembly.Journal of Geodynamics, Vol. 85, pp. 1-10.GlobalGeotectonics
DS201908-1778
2019
Hao, M.Hao, M., Pierotti, C., Tkachev, S., Prakapenka, V., Zhang, J.The anisotropic omphacite in the Earth's upper mantle: implications for detecting eclogitic materials inside the Earth.www.minsocam.org /MSA/Centennial/ MSA_Centennial _Symposium.html The next 100 years of mineral science, June 20-21, p. 27. AbstractMantleeclogites

Abstract: Omphacite is a clinopyroxene solid solution of Fe-bearing diopside and jadeite, and is stable up to about 500 km depth in the Earth’s interior. It is also a major mineral component of eclogite (up to 75 vol%). Basalt, which makes up most of the Earth’s oceanic crust, transforms into eclogite at the depth > ~60 km. Due to the ~20% higher density of eclogite, it is considered one of the main driving forces for the slab subduction. Subducted eclogite is also an important source of the chemical heterogeneities in the Earth’s mantle, which are the potential reservoirs for the enriched geochemical components. Thus, studying the geophysical properties of omphacite at elevated pressure-temperature conditions is of great interest for both the geophysical and geochemical community. Previous studies have proposed to utilize the unique anisotropic seismic properties of eclogite to identify possible subduction channels and eclogite-rich regions in the Earth’s interior. Due to the elastically isotropic nature of garnet and the relatively small proportion (< 10 vol%) of the silica minerals in eclogite, the seismic anisotropy of eclogite is primarily caused by the lattice preferred orientation of omphacite. Thus, in this study, in addition to determining the densities, and isotropic velocities of omphacite at the high pressuretemperature condition, we also paid special attention to the elastic anisotropy of omphacite. We combined the synchrotron single-crystal X-ray diffraction at Advanced Photon Source, Argonne National Laboratory with offline Brillouin spectroscopy experiments at University New Mexico to investigate the anisotropic thermoelastic properties of omphacite. Incorporated with the preexisting thermoelastic database of other relevant mantle mineral phases, we compared the anisotropic seismic properties of eclogite (slab crust) with pyrolite (ambient mantle) along mantle geotherms down to 500 km depth. The maximum isotropic and anisotropic velocities contrast between pyrolite and eclogite is at 310-410 km, making it an optimal depth range for seismologists to search for eclogite-rich heterogeneities in the Earth’s interior. The ~5%-7% velocity difference between eclogite and pyrolite also needs to be taken into account when estimating the slab temperatures between 310-410 km depth. Otherwise, the slab temperature could be underestimated by a few hundred K without considering the possible lithology difference.
DS202010-1857
2020
Hao, M-z.Liu, S., Ding, L., Fan, H-R., Yang, K-F., Tang, Y-W. She, H-D, Hao, M-z.Hydrothermal genesis of Nb mineralization in the giant Bayan Obo REE-Nb-Fe deposit ( China): implicated by petrography and geochemistry of Nb-bearing minerals.Precambrian Research, Vol. 348, 105864 24p. PdfChinadeposit - Bayan Obo

Abstract: The Bayan Obo REE-Nb-Fe deposit, which reserves the current largest REE resources globally, also hosts over 70% of China’s Nb resources. Unlike many world-class carbonatite-related Nb deposits (e.g. Morro dos Seis Lagos and Araxá, Brazil) with igneous or secondary origin, Nb was mainly stored in Nb-bearing minerals (aeschynite, ilmenorutile, baotite, fergusonite etc.) of hydrothermal origin at Bayan Obo, supported by evidence from petrography, element and isotopic geochemistry. Although igneous fersmite and columbite were occasionally discovered in local carbonatite dykes, the Mesoproterozoic and Paleozoic hydrothermal metasomatism occurred in the ore-hosting dolomite, related to carbonatite intrusion and the closure of Paleo-Asian Ocean respectively, has played a more significant role during the ultimate Nb enrichment. REE, however, was significantly enriched during both the carbonatite-related magmatic and hydrothermal processes. Consequently, there was differentiated mineralization between REE and Nb in the carbonatite dykes and the ores. Niobium mineralization at Bayan Obo is rather limited in Mesoproterozoic carbonatite, whereas more extensive in the metasomatized ore-hosting dolomite, and generally postdating the REE mineralization at the same stage. According to mineral geochemistry, Bayan Obo aeschynite was classified into 3 groups: aeschynite-(Nd) with convex REE patterns (Group 1); aeschynite-(Ce) (Group 2) and nioboaeschynite (Group 3) with nearly flat REE patterns. Aeschynite (Group 1), ilmenorutile and fergusonite precipitated from Paleozoic hydrothermal fluids with advanced fractionation of Ce-rich REE minerals. The Mesoproterozoic hydrothermal Nb mineralization, represented by aeschynite (Group 3) and baotite, occurred postdating REE mineralization at same stage. Besides, fersmite and aeschynite (Group 2) precipitated from the Mesoproterozoic REE-unfractionated melt and hydrothermal fluids, respectively. All above Nb-bearing minerals exhibit extreme Nb-Ta fractionation as a primary geochemical characteristic of mantle-derived carbonatite. The forming age of the aeschynite megacrysts (Group 1) has not been accurately determined. However, the potential age was constrained to ~430 Ma or alternatively ~270-280 Ma subjected to subduction and granite activity, respectively. These aeschynite crystals inherited REEs from multiphase former REE mineralization, with an intermediate apparent Sm-Nd isochron age between the Mesoproterozoic and the Paleozoic REE mineralization events.
DS201805-0993
2018
Hao, X.Xiong, F., Yang, J., Xu, X., Kapsiotis, A., Hao, X., Liu, Z.Compositional and isotopic heterogeneities in the Neo-Tethyan upper mantle recorded by coexisting Al rich and Cr rich chromitites in the Purang massif, SW Tibet (China).Journal of Asian Earth Sciences, Vol. 159, pp. 109-129.China, Tibetchromitites

Abstract: The Purang harzburgite massif in SW Tibet (China) hosts abundant chrome ore deposits. Ores consist of 20 to >95% modal chromian spinel (Cr-spinel) with mylonitic fabric in imbricate shaped pods. The composition of Cr-spinel in these ores ranges from Al-rich [Cr#Sp or Cr/(Cr?+?Al)?×?100?=?47.60-57.56] to Cr-rich (Cr#Sp: 62.55-79.57). Bulk platinum-group element (PGE) contents of chromitites are also highly variable ranging from 17.5?ppb to ?2.5?ppm. Both metallurgical and refractory chromitites show a general enrichment in the IPGE (Os, Ir and Ru) with respect to the PPGE (Rh, Pt and Pd), resulting mostly in right-sloping primitive mantle (PM)-normalized PGE profiles. The platinum-group mineral (PGM) assemblages of both chromitite types are dominated by heterogeneously distributed, euhedral Os-bearing laurite inclusions in Cr-spinel. The Purang chromitites have quite inhomogeneous 187Os/188Os ratios (0.12289-0.13194) that are within the range of those reported for mantle-hosted chromitites from other peridotite massifs. Geochemical calculations demonstrate that the parental melts of high-Cr chromitites were boninitic, whereas those of high-Al chromitites had an arc-type tholeiitic affinity. Chromite crystallization was most likely stimulated by changes in magma compositions due to melt-peridotite interaction, leading to the establishment of a heterogeneous physicochemical environment during the early crystallization of the PGM. The highly variable PGE contents, inhomogeneous Os-isotopic compositions and varying Cr#Sp ratios of these chromitites imply a polygenetic origin for them from spatially distinct melt inputs. The generally low ?Os values (<1) of chromitites indicate that their parental melts originated within different sections of a heterogeneously depleted mantle source region. These melts were most likely produced in the mantle wedge above a downgoing lithospheric slab.
DS201702-0243
2017
Hao, Y-T.Tian, Z-Z., Liu, J., Xia, Q-K., Ingrin, J., Hao, Y-T., Depecker, C.Water concentraion profiles in natural mantle orthopyroxenes: a geochronometer for long annealing of xenoliths within magma.Geology, Vol. 45, 1, pp. 87-90.ChinaBasanites, Foidites

Abstract: Both mantle-derived clinopyroxene and orthopyroxene are generally homogeneous in water concentration, while water content in the coexisting olivine is affected by partial or complete loss during the ascent of the hosting magma. Here, we report the first record of water content profiles (higher water in the cores than in the rims) in natural orthopyroxene grains in peridotite xenoliths hosted by Cenozoic alkali basalts in Tianchang volcano, eastern China. The water contents of the coexisting clinopyroxene grains are homogeneous and are twice that measured in the cores of orthopyroxene grains, confirming previous chemical equilibrium between the two pyroxenes. The olivines (ol) are nearly dry (?0 ppm). These observations demonstrate that H diffusion in mantle orthopyroxene (opx) is faster than in clinopyroxene (cpx), and the relative mobility of H in each mineral phase could be quantified as: Graphic (where is the chemical diffusion coefficient of hydrogen). Combining this with experimental diffusion coefficients from the literature, we infer that (1) the xenoliths remained in contact with the magma below 900 °C for several months, and (2) clinopyroxene remains the more reliable recorder of water from depth, and orthopyroxene should be used more cautiously but can be considered with olivine for tracing slow transport and cooling of magma.
DS201906-1318
2019
Hao, Z.Liu, Z., Liu, L., Huang, M., Fei, H., Zhou, J., Zhang, Y., Hao, Z.New progress in deep Earth exploration and application. Overview of conferenceActa Geologica Sinica, Vol. 93, 2, pp. 499-501. in ENGChinageodynamics
DS1983-0279
1983
Hao YongweiHao YongweiThe Characteristics of Diamond Bearing Sediments in ChinaMineral Deposits, Vol. 2, No. 3, PP. 51-56.ChinaAge Dating, Classification
DS1991-1326
1991
Hao ZiguoPeng Genyong, Bao Peisheng, Wang Xibin, Hao ZiguoOrigin of Pl-lherzolite in the Hongguleleng ophiolite, XinjiangActa Petrologica et Mineralogia, Chi, Vol. 10, pt. 2, May p. 126. English abstract onlyChinaLherzolite, Ophiolite
DS201909-2069
2019
Hapeman, J.R.Palke, A., Hapeman, J.R.Rubies from Rock Creek, Montana. PotentateGems & Gemology, Vol. 55, 7, pp. 286-288.United States, Montanaruby
DS1993-0626
1993
Hapke, B.Hapke, B.Theory of reflectance and emittance spectroscopyCambridge Press, 300p. $ 125.00GlobalBook -ad, Spectroscopy
DS1993-0627
1993
Hapke, B.Hapke, B.Topics in remote sensing.. theory of reflectance and emittancespectroscopyCambridge University Press, Remote Sensing # 3, No. 30789-9, 160pGlobalBook -table of contents, Remote sensing -spectroscopy
DS201611-2113
2016
Happe Kazanzu, C.Happe Kazanzu, C., Linol, B., de Wit, M.J., Brown, R., Persano, R., Stuart, F.M.From source to sink in central Gondwana: exhumation of the Precambrian basement rocks of Tanzania and sediment accumulation in the adjacent Congo basin.Tectonics, Vol. 35, 9, pp. 2034-2051.Africa, TanzaniaGeodynamics

Abstract: Apatite fission track (AFT) and (U-Th)/He (AHe) thermochronometry data are reported and used to unravel the exhumation history of crystalline basement rocks from the elevated (>1000?m above sea level) but low-relief Tanzanian Craton. Coeval episodes of sedimentation documented within adjacent Paleozoic to Mesozoic basins of southern Tanzania and the Congo basin of the Democratic Republic of Congo indicate that most of the cooling in the basement rocks in Tanzania was linked to erosion. Basement samples were from an exploration borehole located within the craton and up to 2200?m below surface. Surface samples were also analyzed. AFT dates range between 317?±?33?Ma and 188?±?44?Ma. Alpha (Ft)-corrected AHe dates are between 433?±?24?Ma and 154?±?20?Ma. Modeling of the data reveals two important periods of cooling within the craton: one during the Carboniferous-Triassic (340-220?Ma) and a later, less well constrained episode, during the late Cretaceous. The later exhumation is well detected proximal to the East African Rift (70?Ma). Thermal histories combined with the estimated geothermal gradient of 9°C/km constrained by the AFT and AHe data from the craton and a mean surface temperature of 20°C indicate removal of up to 9?±?2?km of overburden since the end of Paleozoic. The correlation of erosion of the craton and sedimentation and subsidence within the Congo basin in the Paleozoic may indicate regional flexural geodynamics of the lithosphere due to lithosphere buckling induced by far-field compressional tectonic processes and thereafter through deep mantle upwelling and epeirogeny tectonic processes.
DS2000-0165
2000
Hapugoda, S.Collerson, K.D., Hapugoda, S., Williams, Q.Rocks from mantle transition zone: majorite bearing xenoliths from MalaitaScience, Vol. 288, No. 5469, May 19, pp. 1215-22.GlobalMantle - xenoliths
DS1984-0569
1984
Hara, K.Osugi, S., Arase, T., Hara, K., Amita, F.Diamond Formation in Molten Nickel. (research Note)High Temperatures-high Pressures, Vol. 16, No. 2, PP. 191-195.GlobalExperimental Petrology
DS1999-0171
1999
Harabaglia, P.Doglioni, C., Harabaglia, P., Piromallo, C.Orogens and slabs vs their direction of subductionEarth Science Reviews, Vol. 45, No. 3-4, Mar. pp. 167-208.GlobalTectonics, geodynamics, subduction
DS202008-1428
2020
Harada, K.Nishiyama, T., Ohfuji, H., Fukuba, K., Terauchi, M., Nishi, U., Harada, K., Unoki, K., Moribe, Y., Yoshiasa, A., Ishimaru, S., Mori, Y., Shigeno, M., Arai, S.Microdiamond in a low grade metapelite from a Cretaceous subduction complex, western Kyushu, Japan. ( UHP) Nishisonogi unitNature Scientific Reports, Vol. 10, 11645 11p. PdfAsia, Japanmicrodiamond

Abstract: Microdiamonds in metamorphic rocks are a signature of ultrahigh-pressure (UHP) metamorphism that occurs mostly at continental collision zones. Most UHP minerals, except coesite and microdiamond, have been partially or completely retrogressed during exhumation; therefore, the discovery of coesite and microdiamond is crucial to identify UHP metamorphism and to understand the tectonic history of metamorphic rocks. Microdiamonds typically occur as inclusions in minerals such as garnet. Here we report the discovery of microdiamond aggregates in the matrix of a metapelite from the Nishisonogi unit, Nagasaki Metamorphic Complex, western Kyushu, Japan. The Nishisonogi unit represents a Cretaceous subduction complex which has been considered as an epidote-blueschist subfacies metamorphic unit, and the metapelite is a member of a serpentinite mélange in the Nishisonogi unit. The temperature condition for the Nishisonogi unit is 450 °C, based on the Raman micro-spectroscopy of graphite. The coexistence of microdiamond and Mg-carbonates suggests the precipitation of microdiamond from C-O-H fluid under pressures higher than 2.8 GPa. This is the first report of metamorphic microdiamond from Japan, which reveals the hidden UHP history of the Nishisonogi unit. The tectonic evolution of Kyushu in the Japanese Archipelago should be reconsidered based on this finding.
DS1993-0628
1993
Harada, T.Harada, T.The role of resource recyclingNonrenewable Resources, Vol. 2, No. 3, Fall pp. 247-255GlobalEconomics, Recycling -role
DS201902-0313
2018
Harada, T.Ritterbex, S., Harada, T., Tsuchiya, T.Vacancies in MgO at ultrahigh pressure: about mantle rheology of super-Earths.Icarus, Vol. 305, 1, pp. 350-357.MantleUHP

Abstract: First-principles calculations are performed to investigate vacancy formation and migration in the B2 phase of MgO. Defect energetics suggest the importance of intrinsic non-interacting vacancy pairs, even though the extrinsic vacancy concentration might govern atomic diffusion in the B2 phase of MgO. The enthalpies of ionic vacancy migration are generally found to decrease across the B1-B2 phase transition around a pressure of 500?GPa. It is shown that this enthalpy change induces a substantial increase in the rate of vacancy diffusion in MgO of almost four orders of magnitude (?104) when the B1 phase transforms into the B2 phase with increasing pressure. If plastic deformation is controlled by vacancy diffusion, mantle viscosity is expected to decrease in relation to this enhanced diffusion rate in MgO across the B1-B2 transition in the interior of Earth-like large exoplanets. Our results of atomic relaxations near the defects suggest that diffusion controlled creep viscosity may generally decrease across high-pressure phase transitions with increasing coordination number. Plastic flow and resulting mantle convection in the interior of these super-Earths may be therefore less sluggish than previously thought.
DS200512-0400
2005
Harada, Y.Harada, Y., Wessel, P.How geometry and ages of global hotspots are explained by classical hypotheses of rigid plate and fixed hotspot.Chapman Conference held in Scotland August 28-Sept. 1 2005, 1p. abstractMantleMantle plume, tectonics
DS201112-0752
2011
Harada, Y.Ogassawara, Y., Hasiguchi, Y., Igarashi, M., Harada, Y.Microdiamonds: a relict of intermediate phase for diamond formation.Geological Society of America, Annual Meeting, Minneapolis, Oct. 9-12, abstractRussiaKokchetav massif, UHP
DS201511-1840
2015
Harada, Y.Harada, Y., Hishinuma, R., Terashima, C., Uetsuka, H., Nakata, K., Kondo, T., Yuasa, M., Fujishima, A.Rapid growth of diamond and its morphology by in-liquid plasma CVD.Diamond and Related Materials, in press available, 16p.TechnologySynthetics

Abstract: Diamond synthesis and its morphology by in-liquid plasma chemical vapor deposition (CVD) method are investigated in this study. Diamond films were grown on Si substrates from mixed alcohol solution. Very high growth rate of 170 ?m/h was achieved by this method. Microcrystalline and nanocrystalline diamond films were formed in different conditions. In the case of microcrystalline film, the shapes of diamond grains depend on the location in the film. All morphological differences in this study can be explained by the same mechanism of conventional gas phase CVD method. It means diamond morphology by in-liquid plasma CVD method can be controlled by process parameters as well as gas phase CVD method.
DS201805-0968
2018
Harada, Y.Ono, K., Harada, Y., Yoneda, A., Yamamoto, J., Yoshiasa, A., Sugiyama, K., Arima, H., Watanabe, T.Determination of elastic constants of single crystal chromian spinel by resonant ultrasound spectroscopy and implications for fluid inclusion geobarometry.Physics and Chemistry of Minerals, Vol. 45, 3, pp. 237-247.Technologyxenolths

Abstract: We determined elastic constants of a single-crystal chromian spinel at temperatures from ?15 to 45 °C through the Rectangular Parallelepiped Resonance method. The sample is a natural chromian spinel, which was separated from a mantle xenolith. Elastic constants at an ambient temperature (T = 24.0 °C) are C 11 = 264.8(1.7) GPa, C 12 = 154.5(1.8) GPa and C 44 = 142.6(0.3) GPa. All the elastic constants decrease linearly with increasing temperature. The temperature derivatives are dC 11/dT = ?0.049(2) GPa/°K, dC 12/dT = ?0.019(1) GPa/°K and dC 44/dT = ?0.020(1) GPa/°K. As an implication of the elastic constants, we applied them to the correction of a fluid inclusion geobarometry, which utilizes residual pressure of fluid inclusion as a depth scale. Before entrainment by a magma, the fluid inclusions must have the identical fluid density in constituent minerals of a xenolith. It has been, however, pointed out that fluid density of fluid inclusions significantly varies with host mineral species. The present study elucidates that elastic constants and thermal expansion coefficients cannot explain the difference in fluid density among mineral species. The density difference would reflect the difference in the degree of plastic deformation in the minerals.
DS1987-0003
1987
Harakal, J.E.Agyei, E.K., Van Landewijk, J.E.J.M., Armstrong, R.L., Harakal, J.E.Rubidium-strontium and potassium-argon geochronometry of southeasternGhanaJournal of African Earth Science, Vol. 6, No. 2, pp. 153-161GhanaCarbonatite
DS1980-0326
1980
Haralyi, N.L.E.Svisero, D.P., Haralyi, N.L.E., Girardi, V.A.V.Geology of the Limeira 1, Limeira 2 and Indaia Kimberlites, douradoquara Minas Gerais.Anais Do Congresso, 31st., Vol. 3, PP. 1789-1801.BrazilGeology, Geophysics
DS1984-0339
1984
Haralyi, N.L.E.Haralyi, N.L.E., Svisero, D.P.O Diamante Estrela Da CapetingaAnais Do Xxxiii Congresso Brasileiro De Geologia., PP. 5, 006-5, 013.GlobalDiamonds Notable, Morphology, Crystallography, Mineralogy
DS1984-0719
1984
Haralyi, N.L.E.Svisero, D.P. , Haralyi, N.L.E.O Kimberlito Indaia Monte Carmelo-mgAnais Do Xxxiii Brasileiro De Geologia., PP. 5, 014-5, 026.Brazil, Minas GeraisDiatreme, Geology, Petrography, Geophysics
DS1985-0263
1985
Haralyi, N.L.E.Haralyi, N.L.E., Hasui, Y., Svisero, D.P.Basement Controls of the Alkaline Province of West Minas Gerais, Brasil.International Association GENESIS of ORE DEPOSITS WORKSHOP HELD IN CONJ, ABSTRACT VOLUME P. 35. (abstract.).Brazil, Minas GeraisGeophysics, Kimberlite, Geotectonics
DS1989-0586
1989
Haralyi, N.L.E.Haralyi, N.L.E., Hasui, Y.Crustal block structure of Brasil and associated ore depositsGlobal Tectonics and Metallogeny, Vol. 3, No. 2 and 3, pp. 187-188. Extended abstractBrazilBrief mention of association of diamonds, Tectonics, Shear zones
DS1991-0664
1991
Haralyi, N.L.E.Haralyi, N.L.E., Hasui, Y.The Sopa conglomerate in the Diamantin a region, Min as GeraisFifth International Kimberlite Conferences Field Excursion Guidebook, Servico Geologico do Brasil (CPRM) Special, pp. 95-100BrazilConglomerate, Alluvial diamonds
DS1994-0712
1994
Haralyi, N.L.E.Haralyi, N.L.E., Hasui, Y., Rodriques, A.S.O segundo maior diamante Brasileiro: 602 quilatesGeosciences, Vol. 13, No. 1, pp. 213-224.BrazilDiamond
DS1996-0357
1996
Harangi, S.Demeny, A., Harangi, S.Stable isotope studies and processes of carbonate formation in Hungarian alkali basalts and lamprophyresLithos, Vol. 37, No. 4, May 1, pp. 335-HungaryLamprophyres, Mecsek Mountains, Sediments, Geochronology
DS201803-0482
2018
Harano, K.Tatsumi, N., Harano, K., Ito, T., Sumiya, H.The luminescence emitted from the type Ib and IIa diamonds under SiO2 polishing process.Diamond & Related Materials, Vol. 83, pp. 104-108.Technologyluminescence

Abstract: The luminescence of triboplasma during diamond polishing was investigated. The main luminescence in the ultraviolet range came from N2 molecules in the air. The colors of the visible range of triboplasma were the same as those observed in the photoluminescence images, excited by the ultraviolet light. The color of the triboplasma luminescence was green for type Ib diamond, which was mainly from the H3 center. The blue luminescence for type IIa diamond was mainly from Band A. The correlation between the diamond temperature and periphery speed indicate that that the mechanical abrasion component also increased linearly. However the polishing rate showed a threshold at the periphery speed of 26?km/h which corresponds well with the threshold of the triboplasma generation. These results imply that the electrical and optical energy of the triboplasma excited the defect level at the diamond surface and enhanced the chemical polishing rate of the diamond.
DS1993-0976
1993
Harbaugh, J.W.Martinez, P.A., Harbaugh, J.W.Simulating near shore environments... sediment transportPergamon Press, 280p. approx. $ 110.00GlobalBook -ad, Transport methodology
DS1991-0665
1991
Harben, P.Harben, P., Notstaller, R.Diamonds -scintillating performance in growth and pricesIndustrial Minerals, No. 282, March pp. 35-47GlobalEconomics, Overview - extensive
DS1992-0665
1992
Harben, P.Harben, P.Strategic minerals. An overview -not in depthEarth, Vol. 1, No. 4, July pp. 36-45GlobalEconomics, chromite, bauxite, manganese, Strategic minerals -focus on diamonds
DS1990-0654
1990
Harben, P.W.Harben, P.W., Bates, R.L.Industrial minerals geology and world depositsIndustrial Minerals, $82.50 United StatesGlobalIndustrial minerals
DS1990-0655
1990
Harben, P.W.Harben, P.W., Bates, R.L.Diamonds, 1990 #1In: Industrial minerals geology and world deposits, Industrial Minerals, pp. 92-101GlobalOverview, Very outdated information
DS1991-0666
1991
Harben, P.W.Harben, P.W.The industrial minerals handybook, a guide to markets, specifications andpricesIndustrial Minerals, Reference book approx. $ 105.00 United StatesGlobalIndustrial Minerals, General reference guide
DS1992-0666
1992
Harben, P.W.Harben, P.W.The industrial minerals handybook: a guide to markets, specifications andprices... diamonds two pagesIndustrial Minerals Division, pp. 24-25GlobalDiamonds, brief overview of producers
DS1992-0667
1992
Harben, P.W.Harben, P.W.Strategic minerals. A brief overview with a focus on diamondsEarth, Vol. 1, No. 4, July pp. 36-43GlobalStrategic minerals discussed, Diamonds, chromite, bauxite, manganese
DS1995-0746
1995
Harben, P.W.Harben, P.W.The Industrial Minerals HandybookIndustrial Minerals, approx. 160.00 United StatesGlobalBook -ad, Industrial Minerals Handybook
DS1996-0596
1996
Harben, P.W.Harben, P.W., Kuzvart, M.A Global GeologyIndustrial Minerals, approx. $ 175.00 United StatesGlobalIndustrial -book, Book -ad
DS1996-0595
1996
Harben P.W.Harben P.W., Kuzvart, M.Industrial minerals: a global economyIndustrial Minerals, $ 200.00Europe, China, Russia, GlobalBook - ad, Industrial minerals
DS200712-0771
2007
Harbor, J.Napieralski, J., Harbor, J., Li, Y.Glacial geomorphology and geographic information systems.Earth Science Reviews, Vol. 85, 1-2, pp. 1-22.TechnologyGIS
DS1930-0046
1930
Harbottle, J.Williams, A.F., Harbottle, J.Present Day Practice of Diamond Mining Including RecoveryCommonwealth Min. Met. Congress 3rd., Publishing Johannesburg Off, Vol. 3, PP. 1-20.South AfricaMining Engineering
DS1975-0289
1976
Harbottle, M.Harbottle, M.The Knaves of DiamondsGreat Britain: The Pitman Press, London: Seeley Service Co., 155P.GlobalKimberley, Fiction
DS201312-0672
2013
HarcourtOsler, Hoskin, HarcourtDirector's duties: an overview for mid-sized public mining company executives and directors.PDAC Short course, 13p.CanadaDirectors interests - not very applicable to juniors!
DS201312-0673
2013
HarcourtOsler, Hoskin, HarcourtCorporate Governance in Canada: a guide to the responsibilities of corporate directors in Canada.Osler Hoskin Harcourt publication, March 2009, 90p.CanadaGovernance - outline of function, standards, CSR
DS1990-0656
1990
Harcourt, F.Harcourt, F.The diamond ring- business, politics and precious stones in South AfricaEcon. Hist. R., Vol. 43, No. 3, August pp. 524-525South AfricaBook review, Diamond -economics
DS1996-0726
1996
Hardarson, B.S.Kent, R.W., Hardarson, B.S., Storey, M.Plateaus ancient and modern: geochemical and sedimentological perspectives Archean ocean magmatismLithos, Vol. 37, No. 2/3, April pp. 129-142OceansMagmatism, Geochemistry
DS1989-0911
1989
Hardcastle, K.C.Mabee, S.B., Hardcastle, K.C., Wise, D.U.Ground truth?-relationship between lineaments and bedrock fabricGeological Society of America (GSA) Annual Meeting Abstracts, Vol. 21, No. 6, p. A68. AbstractGlobalTectonics, General - interest
DS1995-0747
1995
Hardebeck, J.Hardebeck, J.Eustasy and the Cretaceous Superplume hypothesisEos, Vol. 76, No. 46, Nov. 7. p.F172. Abstract.MantlePlumes, Sea levels
DS1996-0597
1996
Hardebeck, J.Hardebeck, J., Anderson, D.L.Eustasy as a test of a Cretaceous superplume hypothesisEarth and Planetary Science Letters, Vol. 137, No. 1/4, Jan. 1, pp. 101-108.MantleGeodynamics, Subduction, plumes
DS2001-0445
2001
Hardebeck, J.L.Hardebeck, J.L., Hauksson, E.Crustal stress field in southern California and its implications for fault mechanicsJournal of Geophysical Research, Vol. 106, No. 10, pp.21,859-82.MantleTectonics, seismics, stress
DS201212-0283
2012
Hardebol, N.J.Hardebol, N.J., Pysklywec, R.N., Stephenson, R.Small scale convection at a continental back arc to craton transition: application to the southern Canadian Cordillera.Journal of Geophysical Research,, Vol. 117, B1, B01408.Canada, British ColumbiaConvection
DS1989-0757
1989
HarderKeller, G.R., Braile, L.W., McMechan, G.A., Thomas, W.A., HarderPaleozoic continent-ocean transition in the Ouachita Mountains imaged from PASSCAL wide angle seismic reflection- refractiondataGeology, Vol. 17, No. 2, February pp. 119-122Arkansas, LouisianaTectonics
DS1984-0340
1984
Harder, H.Harder, H.Zur unterscheidung des diamanten von imitationen mit einfachenmitteln.(in German)Aufschluss, (in German), Vol. 35, pp. 363-373GlobalDiamond Refringence, Diamond Morphology
DS200612-1371
2006
Harder, H.Stemmer, K., Harder, H., Hansen, U.A new method to simulate convection with strongly temperature and pressure dependent viscosity in a spherical shell: applications to the Earth's mantle.Physics of the Earth and Planetary Interiors, in press availableMantleGeothermometry, mantle convection, rheology
DS200612-0529
2006
Harder, M.Harder, M., Hetman, C., Scott Smith, B., Pell, J.Geology of the DO27 pipe: a pyroclastic kimberlite in the Lac de Gras Province, NWT, Canada.Emplacement Workshop held September, 5p. extended abstractCanada, Northwest TerritoriesDeposit - DO27, geology
DS200612-0530
2006
Harder, M.Harder, M., Russell, J.K.Thermal state of the upper mantle beneath the Northern Cordillera volcanic province (NCVP) British Columbia, Canada.Lithos, Vol. 87, 1-2, March pp. 1-22.Canada, British ColumbiaMagmatism
DS200612-0598
2006
Harder, M.Holmes, P., Pell, J., Mathison, W., Strickland, D., Harder, M.New sparkle at the DO-27 diamond project.CIM Conference and Exhibition, Vancouver - Creating Value with Values, List of talks CIM Magazine, Feb. p. 78.Canada, Northwest TerritoriesOverview - Peregrine
DS200712-0412
2006
Harder, M.Harder, M., Hetman, C., Scott Smith, B., Pell, J.Geology model of the DO27 pipe.34th Yellowknife Geoscience Forum, p. 82. abstractCanada, Northwest TerritoriesTli Kwi Cho complex
DS200712-0413
2007
Harder, M.Harder, M., Pell, J.Geology of the DO-27 kimberlite pipe.Geological Association of Canada, Gac-Mac Yellowknife 2007, May 23-25, Volume 32, 1 pg. abstract p.37.Canada, Northwest TerritoriesPetrology
DS200812-1032
2008
Harder, M.Scott Smith, B.H., Nowicki, T.E., Russell, J.K., Webb, K.J., Hetman, C.M., Harder, M., Mitchell, R.H.Kimberlites: descriptive geological nomenclature and classification.Northwest Territories Geoscience Office, p. 55. abstractTechnologyBrief overview - nomenclature, classification
DS200912-0279
2009
Harder, M.Harder, M., Scott Smith, B.H., Hetman, C.M., Pell, J.The evolution of geological models for the DO-27 kimberlite, NWT Canada: implications for evaluation.Lithos, In press - available 38p.Canada, Northwest TerritoriesDeposit - DO-27
DS200912-0678
2008
Harder, M.Scott Smith, B.H., Nowicki, T.E., Russell, J.K., Webb, K.J., Hetman, C.M., Harder,M., Mitchell, R.H.Kimberlites: descriptive geological nomenclature and classification POSTER.scottsmithpetrology.com, POSTER free to downloadTechnologyKimberlite classification
DS201212-0629
2012
Harder, M.Scott Smith, B.H., Nowicki, T.E., Russell, J.K., Webb, K.J., Mitchell, R.H., Hetman, C.M., Harder, M., Skinner, E.M.W., Robey, J.V.Kimberlite terminology and classification: geology and emplacement.10th. International Kimberlite Conference Feb. 6-11, Bangalore India, AbstractGlobalClassification - kimberlites
DS201312-0363
2013
Harder, M.Harder, M., Nowicki, T.E., Hetman, C.M.Geology and evaluation of the K2 kimberlite, Koidu mine, Sierra Leone, West Africa.Proceedings of the 10th. International Kimberlite Conference, Vol. 2, Special Issue of the Journal of the Geological Society of India,, Vol. 2, pp. 191-208.Africa, Sierra LeoneDeposit - Koidu
DS201312-0797
2013
Harder, M.Scott Smith, B.H., Nowicki, T.E., Russell, J.K., Webb, K.J., Mitchell, R.H., Hetman, C.M., Harder, M., Skinner, E.M.W., Robey, Jv.A.Kimberlite terminology and classification.Proceedings of the 10th. International Kimberlite Conference, Vol. 2, Special Issue of the Journal of the Geological Society of India,, Vol. 2, pp. 1-17.TechnologyTerminology
DS201412-0339
2013
Harder, M.Harder, M., Nowicki, T.E., Hetman, C.M., Freeman, L., Abedu, B.Geology and exploration of the K2 kimberlite, Koidu mine, Sierra Leone, West Africa.Proceedings of the 10th. International Kimberlite Conference, Vol. 2, pp. 191-208.Africa, Sierra LeoneDeposit - Koidu (K2)
DS201412-0790
2013
Harder, M.Scott Smith, B.H., Nowicki, T.E., Russell, J.K., Webb, K.J., Mitchell, R.H., Hetman, C.M., Harder, M., Skinner, E.M.W., Robey, Jv.A.Kimberlite terminology and classification.Proceedings of the 10th. International Kimberlite Conference, Vol. 2, pp. 1-18.Classification
DS201212-0284
2012
Harder, M.C.Harder, M.C., Nowickia, C., Hetman, T.E., Hetmana, D., Freeman, C.M., Abedub, B.Geology and evaluation of the K2 kimberlite, Koidu mine, Sierra Leone, West Africa.10th. International Kimberlite Conference Feb. 6-11, Bangalore India, AbstractAfrica, Sierra LeoneDeposit - K2 Koidu
DS1993-0937
1993
Harder, S.Lumadyo, E., McCabe, R., Harder, S., Lee, T.Borneo: a stable portion of the Eurasian margin since the EoceneJournal of Southeast Asian Earth Sciences, Vol. 8, No. 104, pp. 225-231.GlobalPaleomagnetics, Structure
DS1987-0274
1987
Harder, S.H.Harder, S.H., Keller, G.R., Scneider, R.V.Seismic recording on the Colorado Plateau: a continuing experimentEos, Vol. 68, No. 44, November 3, p. 1360. Abstract onlyColorado PlateauGeophysics
DS201910-2283
2019
Harder, S.H.Marzen, R.E., Shillington, D.E., Lizarralde, D., Harder, S.H.Constraints on Appalachian orogenesis and continental rifting in the southeastern United States from wide angle seismic data.Journal of Geophysical Research: Solid Earth, Vol. 174, 7, pp. 6625-6652.United Statesgeophysics - seismic

Abstract: The Southeastern United States is an ideal location to understand the interactions between mountain building, rifting, and magmatism. Line 2 of the Suwannee suture and Georgia Rift basin refraction seismic experiment in eastern Georgia extends 420 km from the Inner Piedmont to the Georgia coast. We model crustal and upper mantle VP and upper crustal VS. The most dramatic model transition occurs at the Higgins?Zietz magnetic boundary, north of which we observe higher upper crustal VP and VS and lower VP/VS. These observations support the interpretation of the Higgins?Zietz boundary as the Alleghanian suture. North of this boundary, we observe a low?velocity zone less than 2 km thick at ~5?km depth, consistent with a layer of sheared metasedimentary rocks that forms the Appalachian detachment. To the southeast, we interpret synrift sediments and decreasing crustal thickness to represent crustal thinning associated with the South Georgia Rift Basin and subsequent continental breakup. The correspondence of the northern limit of thinning with the interpreted suture location suggests that the orogenic suture zone and/or the Gondwanan crust to the south of the suture helped localize subsequent extension. Lower crustal VP and VP/VS preclude volumetrically significant mafic magmatic addition during rifting or associated with the Central Atlantic Magmatic Province. Structures formed during orogenesis and/or extension appear to influence seismicity in Georgia today; earthquakes localize along a steeply dipping zone that coincides with the northern edge of the South Georgia Basin and the change in upper crustal velocities at the Higgins?Zietz boundary.
DS200912-0280
2009
Hardgrove, C.Hardgrove, C., Moersch, J., Whisner, S.Thermal imaging of alluvial fans: a new technique for remote classification of sedimentary features.Earth and Planetary Science Letters, Vol. 285, pp. 124-130.TechnologyGeothermometry - not specific to diamonds
DS1975-1050
1979
Hardie, R.B.IIIHaggerty, S.E., Hardie, R.B.III, Mcmahon, B.M.The Mineral Chemistry of Ilmenite Nodule Associations from The Monastery Diatreme.Proceedings of Second International Kimberlite Conference, Proceedings Vol. 2, PP. 249-256.South AfricaGeochemistry
DS1950-0214
1955
Hardin, G.C.Hardin, G.C.Barb Fault System, Crittenden and Livingston Counties, Pt. I,of Fluorspar Deposits in Western Kentucky.United States Geological Survey (USGS) Bulletin. No., 1012-B, PT. IV, PP. 7-37.United States, Kentucky, Central StatesBlank
DS1950-0215
1955
Hardin, G.C.Hardin, G.C., Trace, R.U.Geology and Fluorspar Deposits Big Fault System, Crittenden county Kentucky.United States Geological Survey (USGS) Bulletin., No. 1042-S, PT. III, PP. 699-724.United States, Kentucky, Central StatesBlank
DS2001-0446
2001
Hardin, M.J.Hardin, M.J.The Nunavut waters and Nunavut surface rights tribunal act: better late than never?29th. Yellowknife Geoscience Forum, Nov. 21-23, abstract p. 27-8.Northwest Territories, NunavutLegal - Surface rights, Ashton Mining
DS2002-0653
2002
Hardin M.J.Hardin M.J.The legal basis of the duty to consult with aboriginal people - what are the courts now saying?( Ashton Mining )30th. Yellowknife Geoscience Forum, Abstracts Of Talks And Posters, Nov. 20-22, p. 24. abstractNorthwest TerritoriesLegal - brief
DS1900-0412
1906
Harding, A.J.Harding, A.J.Diamond Formation in CaliforniaJewellers Circular Keystone, Vol. 53, No. 16, Nov. 21ST. P. 123.United States, California, West CoastDiamond Genesis
DS1990-0822
1990
Harding, A.J.Kent, G.M., Harding, A.J., Orcutt, J.A.Evidence for a smaller magma chamber beneath the East Pacific Rise at 930N.Nature, Vol. 344, No. 6267, April 12, pp. 650-653East Pacific RiseMantle, Magma
DS201603-0384
2016
Harding, C.Hasiuk, F., Harding, C.Touchable topography: 3 D printing elevation dat a and structural models to overcome the issue of scale.Geology Today, Vol. 32, 1, pp. 16-20.TechnologyPrinters - not specific to diamonds
DS200812-0436
2008
Harding, C.H.Gutzmer, J., Harding, C.H., Beukes, N.J., Huizenga, J.M., Rajesh, H.M.Continental rifting, alkaline magmatism and the formation of high grade iron ores along the western margin of the Kaapvaal Craton, South Africa.GSSA-SEG Meeting Held July, Johannesburg, 33 Power point slidesAfrica, South Africa, Namibia, BotswanaMagmatism
DS1989-0587
1989
Harding, D.J.Harding, D.J., Wirth, K.R., Bird, J.M.Spectral mapping of Alaskan ophiolites using Land sat thematic mapper dataRemote Sensing of the Environment, Vol. 28, Apr-Jun, pp. 219-232AlaskaOphiolite, Remote sensing
DS201507-0312
2015
Harding, I.C.Gernon, T.M., Spence, S., Trueman, C.N., Taylor, R.N., Rohling, E., Hatter, S.J., Harding, I.C.Emplacement of Cabezo Maria lamproite volcano (Miocene) SE Spain.Bulletin of Volcanology, Vol. 77, 6, pp. 52-Europe, SpainLamproite
DS201702-0247
2016
Harding, J.L.Van Avendonk, H.J.A, Davis, J.K., Harding, J.L.Decrease in oceanic crustal thickness since the break up of Pangea.Nature Geoscience, Vol. 10, pp. 58-61.MantleTectonics

Abstract: Earth’s mantle has cooled by 6-11?°C every 100 million years since the Archaean, 2.5 billion years ago. In more recent times, the surface heat loss that led to this temperature drop may have been enhanced by plate-tectonic processes, such as continental breakup, the continuous creation of oceanic lithosphere at mid-ocean ridges and subduction at deep-sea trenches. Here we use a compilation of marine seismic refraction data from ocean basins globally to analyse changes in the thickness of oceanic crust over time. We find that oceanic crust formed in the mid-Jurassic, about 170 million years ago, is 1.7?km thicker on average than crust produced along the present-day mid-ocean ridge system. If a higher mantle temperature is the cause of thicker Jurassic ocean crust, the upper mantle may have cooled by 15-20?°C per 100 million years over this time period. The difference between this and the long-term mantle cooling rate indeed suggests that modern plate tectonics coincide with greater mantle heat loss. We also find that the increase of ocean crustal thickness with plate age is stronger in the Indian and Atlantic oceans compared with the Pacific Ocean. This observation supports the idea that upper mantle temperature in the Jurassic was higher in the wake of the fragmented supercontinent Pangaea due to the effect of continental insulation.
DS201703-0451
2016
Harding, J.L.Van Avendonk, H.J.A, Davis, J.K., Harding, J.L.Decrease in oceanic crustal thickness since the break up of Pangea.Nature Geoscience, Vol. 10, pp. 58-61.MantleTectonics

Abstract: Earth’s mantle has cooled by 6-11?°C every 100 million years since the Archaean, 2.5 billion years ago. In more recent times, the surface heat loss that led to this temperature drop may have been enhanced by plate-tectonic processes, such as continental breakup, the continuous creation of oceanic lithosphere at mid-ocean ridges and subduction at deep-sea trenches. Here we use a compilation of marine seismic refraction data from ocean basins globally to analyse changes in the thickness of oceanic crust over time. We find that oceanic crust formed in the mid-Jurassic, about 170 million years ago, is 1.7?km thicker on average than crust produced along the present-day mid-ocean ridge system. If a higher mantle temperature is the cause of thicker Jurassic ocean crust, the upper mantle may have cooled by 15-20?°C per 100 million years over this time period. The difference between this and the long-term mantle cooling rate indeed suggests that modern plate tectonics coincide with greater mantle heat loss. We also find that the increase of ocean crustal thickness with plate age is stronger in the Indian and Atlantic oceans compared with the Pacific Ocean. This observation supports the idea that upper mantle temperature in the Jurassic was higher in the wake of the fragmented supercontinent Pangaea due to the effect of continental insulation.
DS1988-0763
1988
Harding, R.Woodward, C., Harding, R.Gemstones; Sterling Publishing Co. New York, 1988Sterling Publishing Co. New York, 60p. $ 9.95GlobalBook review in Canadian Mineralogist Vol. 27, pt. 1, March p. 1, Gemstones
DS1982-0247
1982
Harding, R.R.Harding, R.R.Production and Identification of Synthetic GemstonesInstitute of Mining and Metallurgy. Transactions, Vol. 91, SECT. A., PP. 130-131.GlobalDiamond Synthesis
DS1985-0499
1985
Harding, R.R.Notholt, A.J.G., Highley, D.E., Harding, R.R.Investigation of Phosphate (apatite) Potential of Loch Borralan Igneous Complex, Northwest Highlands of Scotland.Institute of Mining and Metallurgy. Transactions, Vol. 94, SECT.B, PP. B 58-B65.ScotlandCarbonatite
DS1986-0339
1986
Harding, R.R.Harding, R.R., Woodward, C.M.Gemstones; Cambridge University of Press, 1986Cambridge University of Press, 64pGlobalGuide to Museum collection illustrated
DS1987-0806
1987
Harding, R.R.Woodward, C.M., Harding, R.R.Gemstones; Geological Museum of Natural History, 1987Geological Museum of Natural History, London, 60pGlobalGuide to gemstones, Popular account
DS1996-0598
1996
Harding, R.R.Harding, R.R.Gemmolgical association and Gem testing Laboratory Great BritainMineral Industry International., No. April, pp.GlobalLaboratory services, Gem trades
DS1985-0131
1985
Harding, S.T.Crone, A.J., Mckeown, F.A., Harding, S.T., Hamilton, R.M., Russ.Structure of the New Madrid Seismic Source Zone in Southeastern Missouri and Northeastern Arkansaw.Geology, Vol. 13, No. 8, PP. 547-550.United States, Gulf Coast, ArkansasGeophysics
DS1991-1026
1991
Harding, S.T.Luzietti, E.A., Harding, S.T.Reconnaissance seismic reflection surveys in the New Madrid seismic zone, northeast Arkansaw and southeast MissouriUnited States Geological Survey (USGS) Map, Miscellaneous Field Studies Map MF-2135, $ 4.50 three sheetsArkansas, MissouriTectonics, midcontinent, Geophysics -seismics
DS1993-0263
1993
Hardisty, J.Clifford, N.J., Hardisty, J., French, J.R., Hart, S.Down stream variation in bed material characteristics: a turbulence controlled form process feedback mechanismBest, and Bristow, Braided Rivers Geological Society of London, No. 75, pp. 89-104GlobalSedimentology, Geomorphology, Braided rivers
DS1860-0438
1884
Hardman, E.T.Hardman, E.T.Report on the Geology of the Kimberley District, Western Australia.Western Australia Geological Survey Report For 1883, 22P.Australia, Western AustraliaGeology
DS201605-0842
2016
Hardman, M.Hardman, M.Statistical discrimination of mantle eclogitic garnet from crustal garnets.DCO Edmonton Diamond Workshop, June 8-10MantleGarnet
DS201708-1663
2017
Hardman, M.Hardman, M.Robust new statistical approaches to the discrimination of mantle- and crust-derived low -Cr garnets using major and trace element data.11th. International Kimberlite Conference, OralMantlegarnets
DS201512-1926
2015
Hardman, M.F.Hardman, M.F., Stachel, T., Pearson, D.G., Kinakin, Y.B., Bellinger, J.Improving the utility of eclogitic garnet in diamond exploration - examples from Lac de Gras and worldwide localities.43rd Annual Yellowknife Geoscience Forum Abstracts, abstract p. 47.Canada, Northwest TerritoriesGarnet chemistry

Abstract: In diamond exploration, the use of compositional data to identify diamond-related peridotitic xenocrysts has long been a widely used and powerful tool. In contrast, the application of similar methods to eclogitic garnet chemistry remains a challenge. The inability to unequivocally classify certain “eclogitic” garnet compositions as either mantle- or crust-derived implies that a high abundance of lower-crustal garnets will increase diamond-exploration expenditures by introducing a number of “false positives.” Revising existing classification schemes (e.g., Schulze, 2003) to reduce the abundance of “false positives” may, however, increase the number of “false negatives” through the misclassification of mantle-derived garnets as crustal. This study presents new geochemical and petrographical data for garnet and clinopyroxene from 724 kimberlite-hosted, crust- and mantle-derived xenoliths from localities worldwide, with a focus on samples whose lithology is constrained petrographically, rather than single mineral grains from concentrate. Mantle samples are primarily eclogitic and pyroxenitic, as constrained by mineral assemblage and garnet and clinopyroxene mineral chemistry, while crustal samples are dominantly plagioclase-bearing garnet-granulites. For those localities where an established geothermal gradient is available from literature resources, garnet-clinopyroxene pairs are employed in the estimation of pressure-temperature conditions of equilibration through the iterative coupling of the Krogh (1988) geothermometer and the relevant geothermal gradient. Our preliminary results suggest that closure temperatures for Fe-Mg exchange exceed the temperatures of residence of many lower-crustal samples, as geotherm-based calculated pressures of equilibration exceed the apparent stability of plagioclase (see Green and Ringwood, 1972). Comparison of equilibration pressures with sodium contents in garnet for mantle-derived samples (the diamond-facies criterion of Gurney, 1984) shows a positive correlation at localities for which an adequate range of pressures is observed (e.g., the Diavik mine). Other populations, such as mantle eclogitic garnets from Roberts Victor, plot at a much more restricted range of pressures and hence fail to demonstrate this correlation; instead, these samples may reflect the influence of a broader range of bulk-compositions, providing varying amounts of sodium to their constituent garnets. The results presented here demonstrate clearly that garnets from mantle- and crust-derived samples show significant overlap in geochemical character, for example in garnet Ca# vs. Mg# space (discrimination diagram of Schulze, 2003), where approximately 66% of our crust-derived garnet analyses plot in the “mantle” field. This percentage varies among locations. A selection of particularly high-Mg#, low-Ca# garnets derived from crustal, plagioclase-bearing lithologies in this study highlights the potential for crust-mantle confusion, as these garnets have Mg# in-excess of many mantle-derived eclogitic/pyroxenitic garnets. As a consequence, Fe-Mg-Ca-based classifications alone cannot reliably discriminate mantle and crustal garnets. The next step in this project will be to obtain trace element data for the entire sample suite. This will allow us to test the Li-geobarometer of Hanrahan et al. (2009) for eclogites and to search for trace element signatures that can be used as robust indicators of a diamond-facies origin of eclogitic garnets. Trace element data will also be employed in the refinement of the crust/mantle division discussed above.
DS201712-2688
2017
Hardman, M.F.Harris, G.A., Pearson, D.G., Liu, J., Hardman, M.F., Kelsch, D.Mantle composition, age and geotherm beneath the Darby kimberlite field, west central Rae craton.45th. Annual Yellowknife Geoscience Forum, p. 33 abstractCanada, Northwest Territoriesdeposit - Darby

Abstract: New geological and geophysical research on Canada’s Rae craton are providing an increasingly good baseline for diamond exploration. This study uses mantle xenoliths and xenocrysts from the Darby property, located ~200 km southwest of the community of Kugaaruk, Nunavut, to provide new information on the lithospheric mantle and diamond potential of the western portion of the central Rae. Peridotite xenoliths containing enough fresh olivine have a median Mg# value of 92.5, indistinguishable from the median value of 92.6 typical of cratonic peridotites world-wide. Only of the 14 peridotitic xenoliths contain fresh garnet. Of these, garnet in one sample is classified as harzburgitic (G10), giving a minimum pressure of 4.7 GPa using the P38 geobarometer (38 mW/m2 model geothermal gradient), while garnets from three peridotites are classified as lherzolitic (G9). 52 garnets picked from concentrate have lherzolitic affinities. Lherzolitic diopsides from kimberlite heavy mineral concentrate yield a lithospheric thickness of ~ 200 km. The four garnet peridotite xenoliths and 49 peridotitic garnets from concentrate yield two distinct modes in mantle sampling depths using Ni thermometry, when projected to the Cpx geotherm. A cluster of samples from the higher Ca/Cr lherzolitic garnets equilibrated at 765 to 920 °C with a group of peridotitic garnets (50 % of xenoliths and 28 % of concentrate) from the lower Ca/Cr lherzolitic garnets with anomalously high Ti concentrations yielding super-adiabatic TNi values The aluminum-in-olivine thermometer applied to olivines filtered to be “garnet facies yielded a mantle sampling portion of the mantle cargo from the diamond stability field. A suite of pyroxenitic xenoliths are a feature of each Darby kimberlite target. New screening techniques indicate that these rocks likely originate close to the crust mantle boundary. Osmium isotope analyses of the Darby peridotites reveal whole-rock Re-depletion ages ranging from Mesoarchean to Paleoproterozoic. The pyroxenite xenoliths have very radiogenic Os isotope compositions and provide the first age information from pyroxenites/“eclogites” beneath the Rae craton. Their resulting Archean whole rock TMA ages are consistent with a Mesoarchean age of the western Central Rae lithosphere older than the lithosphere beneath the Repulse Bay block in the East section of the Rae craton (Liu et al., 2016. Precambrian Research 272). The highly depleted olivine compositions, thick cold lithosphere, and Archean ages of the Darby peridotite xenoliths clearly indicate the presence of 200 km thick cold cratonic lithospheric mantle beneath the western segment of the central Rae craton circa 540 Ma. The Archean model ages of most of the pyroxenites support this, notwithstanding the fact that some of these rocks could be sampling either crust or mantle lithologies very close to the crust-mantle boundary. Mantle sampling took place well into the diamond stability field at Darby.
DS201802-0241
2018
Hardman, M.F.Hardman, M.F., Pearson, D.G., Stachel, T., Sweeney, R.J.Statistical approaches to the discrimination of crust and mantle derived low Cr garnet - Major element based methods and their application to diamond exploration.Journal of Geochemical Exploration, Vol. 186, pp. 24-35.Mantlegarnet diamond exploration

Abstract: In diamond exploration, the accurate distinction between garnets from the crust or mantle, or from those having a cognate origin with kimberlite (low-Cr megacrysts), is important for the assessment of indicator mineral samples; misclassifications potentially result in costly misdirection of exploration efforts. Existing literature databases and graphical classification schemes for garnets suffer from a paucity of craton-derived, lower-crustal garnets that - as shown here - are among the most difficult to distinguish from garnets of mantle origin. To improve this situation, a large database of new and literature garnet major element analyses has been compiled. Using this dataset, it is shown that the conventionally used Mg# (Mg/(Mg + Fe)) vs. Ca# (Ca/(Mg + Ca)) plot (Schulze, 2003) for discrimination of crust and mantle garnets results in significant overlap (39.2% crustal failure rate using our dataset). We propose a new graphical classification scheme that uses the parameters ln(Ti/Si) and ln(Mg/Fe) to discriminate low-Cr garnets of crust origin from those of a mantle eclogite-pyroxenite origin with an error rate of 10.1 ± 2.1% at the 95% confidence level (assessed via K-fold cross-validation with ten random test datasets), significantly lower than existing methods. Multivariate statistical solutions, which incorporate a wide selection of geochemical variables, represent additional possibilities for discrimination. Using our new database, logistic regression (LR) and linear discriminant analysis (LDA) approaches are evaluated and new crust-mantle garnet discrimination schemes derived. The resulting solutions, using a wide variety of cations in garnet, provide lower misclassification rates than existing literature schemes. Both LR and LDA are successful discrimination techniques with error rates for the discrimination of crust from mantle eclogite-pyroxenite of 7.5 ± 1.9% and 8.2 ± 2.3%, respectively. LR, however, involves fewer stipulations about the distribution of training data (i.e., it is more "robust") and can return an estimate for probability of classification certainty for single garnets. New data from diamond exploration programs can be readily classified using these new graphical and statistical methods. As the discrimination of low-Cr megacrysts from mantle eclogite-pyroxenite is not the focus of this study, we recommend the method of Schulze (2003) or Grütter et al. (2004) for low-Cr megacryst discrimination to identify megacrysts in the "mantle" suite. Runstreams for our LDA and LR approaches using the freeware "R" are provided for quick implementation.
DS201808-1750
2018
Hardman, M.F.Hardman, M.F., Pearson, D.G., Stachel, T., Sweeney, R.J.Statistical approaches to the discrimination of mantle - and crust derived low Cr garnets using major and trace element data.Mineralogy and Petrology, doi.org/10.1007/s00710-018-0622-7 10p.Technologygarnet classification
DS201808-1751
2018
Hardman, M.F.Harris, G.A., Pearson, D.G., Liu, J., Hardman, M.F., Snyder, D.B., Kelsch, D.Mantle composition, age and geotherm beneath the Darby kimberlite field, west central Rae craton.Mineralogy and Petrology, doi.org/10.1007/s00710-018-0609-4 14p.Canada, Northwest Territoriesdeposit - Darby

Abstract: New geological and geophysical research on Canada’s Rae craton are providing an increasingly good baseline for diamond exploration. This study uses mantle xenoliths and xenocrysts from the Darby property, located ~200 km southwest of the community of Kugaaruk, Nunavut, to provide new information on the lithospheric mantle and diamond potential of the western portion of the central Rae. Peridotite xenoliths containing enough fresh olivine have a median Mg# value of 92.5, indistinguishable from the median value of 92.6 typical of cratonic peridotites world-wide. Only of the 14 peridotitic xenoliths contain fresh garnet. Of these, garnet in one sample is classified as harzburgitic (G10), giving a minimum pressure of 4.7 GPa using the P38 geobarometer (38 mW/m2 model geothermal gradient), while garnets from three peridotites are classified as lherzolitic (G9). 52 garnets picked from concentrate have lherzolitic affinities. Lherzolitic diopsides from kimberlite heavy mineral concentrate yield a lithospheric thickness of ~ 200 km. The four garnet peridotite xenoliths and 49 peridotitic garnets from concentrate yield two distinct modes in mantle sampling depths using Ni thermometry, when projected to the Cpx geotherm. A cluster of samples from the higher Ca/Cr lherzolitic garnets equilibrated at 765 to 920 °C with a group of peridotitic garnets (50 % of xenoliths and 28 % of concentrate) from the lower Ca/Cr lherzolitic garnets with anomalously high Ti concentrations yielding super-adiabatic TNi values The aluminum-in-olivine thermometer applied to olivines filtered to be “garnet facies yielded a mantle sampling portion of the mantle cargo from the diamond stability field. A suite of pyroxenitic xenoliths are a feature of each Darby kimberlite target. New screening techniques indicate that these rocks likely originate close to the crust mantle boundary. Osmium isotope analyses of the Darby peridotites reveal whole-rock Re-depletion ages ranging from Mesoarchean to Paleoproterozoic. The pyroxenite xenoliths have very radiogenic Os isotope compositions and provide the first age information from pyroxenites/“eclogites” beneath the Rae craton. Their resulting Archean whole rock TMA ages are consistent with a Mesoarchean age of the western Central Rae lithosphere older than the lithosphere beneath the Repulse Bay block in the East section of the Rae craton (Liu et al., 2016. Precambrian Research 272). The highly depleted olivine compositions, thick cold lithosphere, and Archean ages of the Darby peridotite xenoliths clearly indicate the presence of 200 km thick cold cratonic lithospheric mantle beneath the western segment of the central Rae craton circa 540 Ma. The Archean model ages of most of the pyroxenites support this, notwithstanding the fact that some of these rocks could be sampling either crust or mantle lithologies very close to the crust-mantle boundary. Mantle sampling took place well into the diamond stability field at Darby.
DS201812-2867
2018
Hardman, M.F.Poitras, S.P., Pearson, D.G., Hardman, M.F., Stachel, T., Nowell, G.M.Evidence for a 200 km thick diamond bearing root beneath the Central Mackenzie Valley, Northwest Territories, Canada? Diamond indicator mineral geochemistry from the Horn Plateau and Trout Lake regions.Mineralogy and Petrology, doi.org/10.1007/ s00710-018-0641-4 18p.Canada, Northwest Territoriesindicator minerals, geocthermobarometry

Abstract: The Central Mackenzie Valley (CMV) area of Northwest Territories is underlain by Precambrian basement belonging to the North American Craton. The potential of this area to host kimberlitic diamond deposits is relatively high judging from the seismologically-defined lithospheric thickness, age of basement rocks (2.2-1.7 Ga) and presence of kimberlite indicator minerals (KIMs) in Quaternary sediments. This study presents data for a large collection of KIMs recovered from stream sediments and till samples from two study areas in the CMV, the Horn Plateau and Trout Lake. In the processed samples, peridotitic garnets dominate the KIM grain count for both regions (> 25% each) while eclogitic garnet is almost absent in both regions (< 1% each). KIM chemistry for the Horn Plateau indicates significant diamond potential, with a strong similarity to KIM systematics from the Central and Western Slave Craton. The most significant issue to resolve in assessing the local diamond potential is the degree to which KIM chemistry reflects local and/or distal kimberlite bodies. Radiogenic isotope analysis of detrital kimberlite-related CMV ilmenite and rutile grains requires at least two broad age groups for eroded source kimberlites. Statistical analysis of the data suggests that it is probable that some of these KIMs were derived from primary and/or secondary sources within the CMV area, while others may have been transported to the area from the east-northeast by Pleistocene glacial and/or glaciofluvial systems. At this stage, KIM chemistry does not allow the exact location of the kimberlitic source(s) to be constrained.
DS202004-0519
2020
Hardman, M.F.Howell, D., Stachel, T., Stern, R.A., Pearson, D.G., Nestola, F., Hardman, M.F., Harris, J.W., Jaques, A.L., Shirery, S.B., Cartigny, P., Smit, K.V., Aulbach, S., Brenker, F.E., Jacob, D.E., Thomassot, E., Walter, M.J., Navon, O.Deep carbon through time: Earth's diamond record and its implications for carbon cycling and fluid speciation in the mantle.(peridotite and eclogite used)Geochimica et Cosmochimica Acta, Vol. 275, pp. 99-122.Mantlecarbon

Abstract: Diamonds are unrivalled in their ability to record the mantle carbon cycle and mantle fO2 over a vast portion of Earth’s history. Diamonds’ inertness and antiquity means their carbon isotopic characteristics directly reflect their growth environment within the mantle as far back as ?3.5 Ga. This paper reports the results of a thorough secondary ion mass spectrometry (SIMS) carbon isotope and nitrogen concentration study, carried out on fragments of 144 diamond samples from various locations, from ?3.5 to 1.4 Ga for P [peridotitic]-type diamonds and 3.0 to 1.0 Ga for E [eclogitic]-type diamonds. The majority of the studied samples were from diamonds used to establish formation ages and thus provide a direct connection between the carbon isotope values, nitrogen contents and the formation ages. In total, 908 carbon isotope and nitrogen concentration measurements were obtained. The total ?¹³C data range from ?17.1 to ?1.9 ‰ (P = ?8.4 to ?1.9 ‰; E = ?17.1 to ?2.1‰) and N contents range from 0 to 3073 at. ppm (P = 0 to 3073 at. ppm; E = 1 to 2661 at. ppm). In general, there is no systematic variation with time in the mantle carbon isotope record since > 3 Ga. The mode in ?¹³C of peridotitic diamonds has been at ?5 (±2) ‰ since the earliest diamond growth ?3.5 Ga, and this mode is also observed in the eclogitic diamond record since ?3 Ga. The skewness of eclogitic diamonds’ ?¹³C distributions to more negative values, which the data establishes began around 3 Ga, is also consistent through time, with no global trends apparent. No isotopic and concentration trends were recorded within individual samples, indicating that, firstly, closed system fractionation trends are rare. This implies that diamonds typically grow in systems with high excess of carbon in the fluid (i.e. relative to the mass of the growing diamond). Any minerals included into diamond during the growth process are more likely to be isotopically reset at the time of diamond formation, meaning inclusion ages would be representative of the diamond growth event irrespective of whether they are syngenetic or protogenetic. Secondly, the lack of significant variation seen in the peridotitic diamonds studied is in keeping with modeling of Rayleigh isotopic fractionation in multicomponent systems (RIFMS) during isochemical diamond precipitation in harzburgitic mantle. The RIFMS model not only showed that in water-maximum fluids at constant depths along a geotherm, fractionation can only account for variations of <1‰, but also that the principal ?¹³C mode of ?5 ± 1‰ in the global harzburgitic diamond record occurs if the variation in fO2 is only 0.4 log units. Due to the wide age distribution of P-type diamonds, this leads to the conclusion that the speciation and oxygen fugacity of diamond forming fluids has been relatively consistent. The deep mantle has therefore generated fluids with near constant carbon speciation for 3.5 Ga.
DS202112-1929
2021
Hardman, M.F.Hardman, M.F., Stachel, T., Pearson, D.G., Cano, E.J., Stern, R.A., Sharp, Z.D.Characterising the distinct crustal protoliths of Roberts Victor Type I and II eclogites.Journal of Petrology, doi.org/petrology/egab090 65p. PdfAfrica, South Africadeposit - Roberts Victor

Abstract: The origin of the eclogites that reside in cratonic mantle roots has long been debated. In the classic Roberts Victor kimberlite locality in South Africa, the strongly contrasting textural and geochemical features of two types of eclogites have led to different genetic models. We studied a new suite of 63 eclogite xenoliths from the former Roberts Victor Mine. In addition to major- and trace-element compositions for all new samples, we determined 18O/16O for garnet from 34 eclogites. Based on geochemical and textural characteristics we identify a large suite of Type I eclogites (n = 53) consistent with previous interpretations that these rocks originate from metamorphosed basaltic-picritic lavas or gabbroic cumulates from oceanic crust, crystallised from melts of depleted MORB mantle. We identify a smaller set of Type II eclogites (n = 10) based on geochemical and textural similarity to eclogites in published literature. We infer their range to very low ?18O values combined with their varied, often very low Zr/Hf ratios and LREE-depleted nature to indicate a protolith origin via low-pressure clinopyroxene-bearing oceanic cumulates formed from melts that were more depleted in incompatible elements than N-MORB. These compositions are indicative of derivation from a residual mantle source that experienced preferential extraction of incompatible elements and fractionation of Zr-Hf during previous melting.
DS202204-0527
2022
Hardman, M.F.Lai, M.Y., Stachel, T., Stern, R.A., Hardman, M.F., Pearson, D.G., Harris, J.W.Formation of mixed paragenesis diamonds during multistage growth - constraints from- in situ Delta 13C-delta 15N-[N] analyses of Koidu diamonds.Geochimica et Cosmochimica Acta, Vol. 323, pp. 20-39.Africa, Sierra Leonedeposit - Koidu

Abstract: Inclusion-bearing diamonds from the Koidu kimberlite complex, Sierra Leone (West African Craton) were analyzed in situ for carbon and nitrogen isotope compositions, nitrogen concentrations and nitrogen aggregation states. In a suite of 105 diamonds, 78% contain eclogitic mineral inclusions, 17% contain peridotitic mineral inclusions, and 5% - an unusually high proportion - contain co-occurring eclogitic and peridotitic mineral inclusions indicating a mixed paragenesis. Major and trace element compositions of mineral inclusions from two mixed paragenesis diamonds (one with omphacite + Mg-chromite, the other with eclogitic garnet + forsteritic olivine) were determined. The presence of positive Eu anomalies in centrally located omphacite and eclogitic garnet inclusions indicates derivation from subducted protoliths, formed as igneous cumulates in lower oceanic crust. Mg-chromite (Cr# 85.5; Mg# 65.2) and olivine (Mg# 94.5) inclusions, located in outer portions of the mixed paragenesis diamonds, have compositions indicative of derivation from strongly depleted cratonic peridotites. Given that the olivine Mg# of 94.5 is the highest reported to date for the West African Craton, the eclogitic and peridotitic inclusions in these mixed paragenesis diamonds cannot have precipitated during infiltration of peridotitic substrates by eclogite-derived fluids, as the consequent fluid-rock interaction should lead to Mg# lower than that for the original peridotitic diamond substrate. The different origins of eclogitic and peridotitic inclusions could be explained by physical transport of their host diamonds from eclogitic into peridotitic substrates, possibly along high-strain shear zones, before renewed diamond growth. Based on the ?¹³C-?¹?N systematics of the entire inclusion-bearing diamond suite from Koidu, three major compositional clusters are identified. Cluster 1 (eclogitic diamond cores; ?¹³C = -33.2 to -14.4 ‰ and ?¹?N = -5.3 to +10.1 ‰) bears the isotopic signature of recycled crustal material (± a mantle component). Cluster 2 (peridotitic diamonds and including the core of a diamond containing omphacite + Mg-chromite; ?¹³C = -6.0 to -1.1 ‰ and ?¹?N = -4.2 to +9.7 ‰) likely involves mixing of carbon and nitrogen from subducted and mantle sources. Cluster 3 (rims of eclogitic diamonds and including the eclogitic garnet + olivine included diamond and the rim of the omphacite + Mg-chromite included diamond; ?¹³C = -7.8 to -3.6 ‰ and ?¹?N = -7.9 to -2.1 ‰) matches convecting mantle-derived fluids/melts. The distinct isotopic signatures of the three diamond clusters, together with differences in nitrogen aggregation and cathodoluminescence response between diamond cores and rims, suggest episodic diamond growth during multiple fluid/melt pulses.
DS1995-0940
1995
Hards, V.L.Kerr, A.C., Saunders, A.D., Tarney, J., Berry, N.H., Hards, V.L.Depleted mantle plume geochemical signatures: no paradox for plumetheoriesGeology, Vol. 23, No. 9, Sept. pp. 843-846MantlePlumes, Geochemistry
DS1860-0229
1874
HardwickeHardwickeResume of a Paper by Dunn Entitled " Mode of Occurrence of The Diamonds in South Africa.Hardwicke's Science Gossip, P. 44.Africa, South Africa, Cape ProvinceGeology, Kimberlite Pipes
DS1860-0230
1874
HardwickeHardwickeResume of a Paper by Maskelyne and Flight Entitled " the Diamondiferous Rocks of South Africa".Hardwicke's Science Gossip, P. 187.Africa, South Africa, Cape ProvinceMineralogy, Kimberlite, Pipes
DS1992-0995
1992
Hardwicke, C.D.Marcotte, D.L., Hardwicke, C.D., Nelson, J.B.Automated interpretation of horizontal magnetic gradient profile dataGeophysics, Vol. 57, No. 2, February pp. 288-295GlobalGeophysics, Magnetics
DS2001-0447
2001
Hardy, F.Hardy, F.Contrast of the glacial erosion, transport and sedimentation on the Slave Craton29th. Yellowknife Geoscience Forum, Nov. 21-23, abstract p. 28.Northwest Territories, NunavutGeomorphology - glaciodynamic, Craton - ice flow
DS200412-0789
2004
Hardy, F.Hardy, F., Parent, M.Subglacial processes and conditions and kimberlitic indicator mineral dispersion trains.Quebec Exploration Conference, Canada, QuebecGeochemistry, geomorphology
DS202110-1617
2021
Hardy, J.Hardy, J.Sapphire: a celebration of colour. ( sponsored by Gemfields)jeweleryconnisseur.net, Thames & Hudson series Book no info.Globalsapphires
DS1999-0602
1999
Hardy, S.Ritchie, B.D., Hardy, S., Gawthorpe, R.L.Three dimensional numerical modeling of coarse grained clastic deposition in sedimentary basins.Journal of Geophysical Research, Vol. 104, No. 8, pp. 17, 759-80.AlbertaGeomorphology - fluvial environment
DS2000-0969
2000
HareUSGS, Hearns, P., Hare, Schruber, Sherrill, LaMarGlobal GIS database: digital atlas of Central and South AmericaUsgs, DDS-62-A ( CD ROM)Central America, South AmericaDigital Data series - atlas
DS200712-1077
2007
Hare, N.J.Tesauro,M., Kaban, M.K., Cloetingh, S.A.P.L., Hare, N.J., Beekman, F.3D strength and gravity anomalies of the European lithosphere.Earth and Planetary Science Letters, Vol. 263, 1-2, Nov. 15, pp. 56-73.EuropeGeophysics - gravity
DS1990-0657
1990
Harff, J.Harff, J., Davis, J.C.regionalization in geology by multivariate classificationMath. Geol, Vol. 22, No. 5, July pp. 573-588GlobalGeostatistics, Multivariate classification
DS1860-0989
1897
Harger, H.S.Harger, H.S.Criticism of a Paper by Garnier Entitled Gold and Diamonds In the Transvaal and the Cape.Geological Society of South Africa Transactions, Vol. 2, PP. 124-127.Africa, South Africa, Griqualand WestDiamond Genesis
DS1900-0253
1904
Harger, H.S.Harger, H.S.The Genesis of the Diamond (1904) #1South Africa Mines Commerce and Industry, Vol.2, Oct. 1ST., PP. 648-649.Africa, South AfricaDiamond Genesis
DS1900-0323
1905
Harger, H.S.Harger, H.S.The Diamond Pipes and Fissures of South AfricaGeological Society of South Africa Transactions, Vol. 8, PP. 110-134. BRITISH Association Advanced Science Report FOR 1905Africa, South AfricaGeology, Kimberlite
DS1900-0666
1908
Harger, H.S.Harger, H.S.Discussion of Corstorphine's Paper " the Occurrence in Kimberlite of Garnet Pyroxene Nodules Carrying Diamonds."Geological Society of South Africa Proceedings, Vol. 10, PP. XXXVII-XLIV.Africa, South AfricaMineralogy, Eclogite, Xenoliths, Garnet, Clinopyroxene
DS1900-0667
1908
Harger, H.S.Harger, H.S.Discussion on the Paper by Voit Entitled Kimberlite Dykes and Pipes. #3Geological Society of South Africa Proceedings, Vol. 10, PP. LIII-LVI. ALSO: SOUTH AFRICA MAGAZINE, Vol. 75Africa, South AfricaPetrology, Kimberlite Mines And Deposits
DS1900-0756
1909
Harger, H.S.Harger, H.S.The Occurrence of Diamonds in the Dwyka Conglomerate and Amygdaloidal Lavas and the Origin of Vaal River Diamonds.Geological Society of South Africa Transactions, Vol. 12, PP. 139-158. ALSO: Geological Society of South Africa Proceedings, Vol.Africa, South AfricaVaal River Diggings, Alluvial Diamond Placers, Diamond Genesis
DS1900-0757
1909
Harger, H.S.Harger, H.S.Discussion on a Paper by Merensky Entitled the Diamond Deposits of Luderitzland German Southwest Africa.Geological Society of South Africa Proceedings, Vol. 12, P. LIX.Africa, NamibiaCrystallography, Marine Diamond Placers
DS1910-0054
1910
Harger, H.S.Harger, H.S.The Voorspoed Diamond Mine (1910)In: J.p. Johnson " Geological And Archeological Notes On Ora, 102P. PP. 33-40.South Africa, Orange Free StateGeology, Kimberley
DS1910-0055
1910
Harger, H.S.Harger, H.S.Discussion of Paper by Wagner " the Origin of German South West African diamonds". #1Geological Society of South Africa Proceedings, Vol. 13, PP. XLIV-XLV.Southwest Africa, NamibiaDiamond Genesis, Marine Diamond Placers
DS1910-0187
1911
Harger, H.S.Harger, H.S.Pt. 1, the Bloemhof and Mooifontein Diamond Diggings. Pt 2South African Mining Journal, Vol. 9, PT. 2, Nov. 18TH. PP. 363-364.; Nov. 25TH. PP. 401-40South Africa, Kimberley, Vaal RiverGeology, Genesis
DS1910-0188
1911
Harger, H.S.Harger, H.S.The Voorspoed Diamond Mine (1911)Mines AND MIN. (SCRANTON), Vol. 32, NOVEMBER PP. 247-248.South Africa, Orange Free StateGeology
DS1910-0189
1911
Harger, H.S.Harger, H.S.Note on the Occurrence of Oriental Ruby in KimberliteGeological Society of South Africa Transactions, Vol. 14, PP. 64-70.South Africa, Orange Free StateMineralogy, Corundum
DS1910-0190
1911
Harger, H.S.Harger, H.S.The Coastal Diamond Deposits of German Southwest AfricaMining Engineering Journal of South Africa, Vol. 9, PT. 2, No. 447, SEPT. 30TH. P. 112.Southwest Africa, NamibiaLittoral Diamond Placers, Genesis, Palaeontology
DS1910-0286
1912
Harger, H.S.Harger, H.S.The Great Diamond Industry of South Africa. History of the Progress of de Beers, Premier and Other Diamond Producers, Dutoitspan, Wesselton, Bultfontein.South African Mining Journal 21ST. ANNIVERSARY VOLUME., Vol. 21A, P. 251-259.South AfricaHistory, Mining Engineering
DS1910-0417
1914
Harger, H.S.Harger, H.S.Some Features Associated with the Denudation of the South African Continent.Geological Society of South Africa Proceedings, Vol. 16, PP. XXII-XXXIX.South AfricaGeology, Geomorphology
DS1920-0073
1921
Harger, H.S.Harger, H.S.The Age of the South African Kimberlites and Their Occurrence in Cretaceous Beds.Geological Society of South Africa Transactions, Vol. 24, PP. 1-10. ALSO: Mining Engineering Journal of South Africa, Vol.South AfricaGeochronology, Kimberlite Mines And Deposits
DS1920-0156
1923
Harger, H.S.Harger, H.S.The Lure of the Diamond #2Mining Engineering Journal of South Africa, Vol. 34. PT. 1, JUNE 2ND. P. 362.South AfricaDiamond Genesis
DS1920-0233
1925
Harger, H.S.Harger, H.S.New Diamond Discoveries (1925)Min. Ind. Magazine (johannesburg), Vol. 1, PP. 147-149.South AfricaAlluvial Diamond Placers
DS1920-0335
1927
Harger, H.S.Harger, H.S.Yet Another Diamond Field DiscoveredMin. Ind. Magazine (johannesburg), Vol. 4, P. 375.South AfricaMarine Diamond Placers, Kei River Mouth
DS1920-0336
1927
Harger, H.S.Harger, H.S.Discussion of a Paper by Draper Entitled "on the Occurrence of Diamonds Associated with the Chert Beds of the Dolomite Series in the Districts of Ventersdorp and Lichtenburg".Geological Society of South Africa Proceedings, Vol. 30, PP. 39-44.South Africa, TransvaalGeology, Alluvial Diamond Placers
DS1920-0383
1928
Harger, H.S.Harger, H.S.Central Diamond Mines of Tanganyika. #1Mining Engineering Journal of South Africa, Vol. 39, No. 1933, PP. 157-161.Tanzania, East AfricaGeology, Kimberlite Mines And Deposits
DS1920-0384
1928
Harger, H.S.Harger, H.S.Central Diamond Mines of Tanganyika. #2Mining Engineering Journal of South Africa, Vol. 39, No. 1972, PP. 569-570.Tanzania, East AfricaGeology, Kimberlite Mines And Deposits
DS1920-0445
1929
Harger, H.S.Harger, H.S.Lichtenburg Diamond Estates LimitedMining Engineering Journal of South Africa YEARBOOK, PP. 415-416.South Africa, TransvaalMining
DS1920-0446
1929
Harger, H.S.Harger, H.S.On the Association of Diamonds with the Chert Beds of the Districts of Lichtenburg and Ventersdorf, Transvaal.Geological Society of South Africa Proceedings, Vol. 32, PP. 92-98.South Africa, TransvaalPetrography
DS1920-0447
1929
Harger, H.S.Harger, H.S.Central Diamond Mines and TanganyikaMining Engineering Journal of South Africa, Vol. 40, No. 1972, PP. 566-570.Tanzania, East AfricaMining
DS1930-0024
1930
Harger, H.S.Harger, H.S.Memoir of David DraperMining Engineering Journal of South Africa, Vol. 41, PT. 1, MARCH 8TH. PP. 35-36. MARCH 22ND. PP. 87-88.South AfricaBiography, Obituary
DS1930-0060
1931
Harger, H.S.Harger, H.S.The Genesis of the Diamond (1931)Mining Engineering Journal of South Africa, Vol. 43, PT. 1, No. 2129, PP. 517-518.South AfricaGenesis
DS1989-0819
1989
HargettKoivula, J.I., Kammerling, R.C., Fritsch, E., Fryer, C.W., HargettThe characteristics and identification of filled diamondsGems and Gemology, Vol. 25, No. 2, Summer pp. 68-83GlobalDiamond morphology, Filled diamonds
DS1987-0275
1987
Hargett, D.Hargett, D.Highly radioactive green diamondGems and Gemology, Vol. 23, No. 3, Fall pp. 164-165GlobalDiamond morphology, Irradiation
DS1990-0658
1990
Hargett, D.Hargett, D.Gem trade : lab notes -Diamond cutting risksGems and Gemology, Vol. 26, Spring p. 94GlobalNews item, Diamond cutting
DS1859-0103
1851
Hargraves, E.H.Hargraves, E.H.Papers Relative to Geological SurveysUnknown., P. 69. JULY 2ND.Australia, New South WalesDiamond
DS1975-0731
1978
Hargraves, R.B.Duncan, R.A., Hargraves, R.B., Brey, G.P.Age, Palaeomagnetism and Chemistry of Melilite Basalts in The Southern Cape, South Africa.Geology Magazine., Vol. 115, PP. 317-396.South AfricaRelated Rocks, Geochronology, Geochemistry
DS1975-0732
1978
Hargraves, R.B.Duncan, R.A., Hargraves, R.B., Grey, G.P.Age, Paleomagnetism and Chemistry of Melilite Basalts in The Southern Cape, South Africa.Geology Magazine (London), Vol. 115, No. 5, PP. 317-327.South AfricaGeochronology, Geochemistry
DS1980-0096
1980
Hargraves, R.B.Crough, S.T., Morgan, W.J., Hargraves, R.B.Kimberlites: their Relation to Mantle HotspotsEarth and Planetary Science Letters, Vol. 50, PP. 260-274.South Africa, United States, Appalachia, New YorkTectonics, Genesis
DS1980-0159
1980
Hargraves, R.B.Hargraves, R.B., Onstott, T.C.Paleomagnetic Results from Some Southern African Kimberlites and Their Tectonic Significance.Journal of Geophysical Research, Vol. 85, No. 87, PP. 3587-3596.South AfricaKimberlite, Geophysics
DS1983-0280
1983
Hargraves, R.B.Hargraves, R.B., Bhalla, M.S.Dyke Swarms and other IntrusionsGeological Society INDIA Journal, MEMOIR No. 4, PP. 497-IndiaPaleomagnetism
DS1983-0603
1983
Hargraves, R.B.Tompkins, L.A., Hargraves, R.B., Haggerty, S.E.Magnetic Mineralogy and Palaeomagnetism of the Koidu Kimberlite Complex Sierra Leone, West Africa.Eos, Vol. 64, No. 18, PP. 216-217. (abstract.).West Africa, Sierra LeoneMineral Chemistry
DS1985-0007
1985
Hargraves, R.B.Allsopp, H.L., Hargraves, R.B.Rbsr Ages and Paleomagnetic Dat a for Some Angolan Alkaline IntrusivesTransactions Geological Society of South Africa, Vol. 88, pt. 2, May-August pp. 295-299AngolaAlkaline Rocks
DS1989-0588
1989
Hargraves, R.B.Hargraves, R.B.Paleomagnetism of Mesozoic kimberlites in Southern africa and the Cretaceous apparent polar wander curvefor AfricaJournal of Geophysical Research, Vol. 94, No. B2, February 10, pp. 1851-1866Southern AfricaGeophysics, Paleomagnetics
DS1990-0631
1990
Hargraves, R.B.Haggerty, S.E., Hargraves, R.B., Tompkins, L.A.Oxide mineralogy and magmatic properties of the Koidukimberlite Sierra Leone, West-AfricaGeophysical Journal, I, Vol. 100, No. 2, February pp. 275-Sierra LeoneGarnet analsyses -Mineralogy, Koidu Complex
DS1994-0442
1994
Hargraves, R.B.Doppelhammer, S.K., Hargraves, R.B.Paleomagnetism of Schuller and Franspoort kimberlite pipes in South Africa and an improved Premier pole.Precambrian Research, Vol. 69, No. 1-4, Oct. pp. 193-198.South AfricaGeophysics -Paleomagnetism, Deposit -Schuller, Franspoort
DS1994-1163
1994
Hargraves, R.B.Meet, J.G., Hargraves, R.B., Van der Voo, R., HallPaleomagnetic and 40Ar/39Ar studies of Late Kebaran intrusives in Burundi:Proterozoic supercontinentsJournal of Geology, Vol. 102, No. 6, Nov. pp. 621-638GlobalGeochronology, Proterozoic, Rodinia
DS1994-1197
1994
Hargraves, R.B.Miller, K.C., Hargraves, R.B.Paleomagnetism and some Indian kimberlites and lamproitesPrecambrian Research, Vol. 69, No. 1-4, Oct. pp. 259-268/IndiaGeophysics -Paleomagnetism
DS1995-0763
1995
Hargraves, R.B.Hart, R.J., Hargraves, R.B., Andreoli, M.A.G., TredouxMagnetic anomaly near the center of the Vredefort structure: Implications for impact related signatures.Geology, Vol. 23, No. 3, March pp. 277-280.South AfricaGeophysics -magnetics, Impact Vredefort
DS1995-0764
1995
Hargraves, R.B.Hart, R.J., Hargraves, R.B., Andreoli, M.A.G., Tredoux, M.Magnetic anomaly near center Vredefort structure: implications for impact related magnetic signaturesGeology, Vol. 23, No. 3, March pp. 277-280South AfricaPaleomagnetics - remanent, Impact - Vredefort
DS1998-0332
1998
Hargraves, R.B.De, S., Heaney, P.J., Vincenzi, E.P., Hargraves, R.B.Microstructural comparison between natural polycrystalline diamond -carbonado and artificial..Ima 17th. Abstract Vol., p. A16. poster abstractBrazil, Central African RepublicCarbonado, Diamond synthesis
DS1983-0281
1983
Hargreaves, D.Hargreaves, D., Fromson, S.Diamonds; World Index of Strategic Minerals, 1983Gower., PP. 71-73.GlobalDiamond Production Statistics
DS1983-0282
1983
Hargreaves, D.Hargreaves, D., Fromson, S.Diamond. In: World Index of Stratgeic Minerals Their Production, Exploitation and RiskGower Publishing Co., PP. 69-71.GlobalProduction
DS201112-0411
2011
Hargreaves, D.Hargreaves, D.Resource nationalism or: grab it with both hands.Objective Capital Global Resources Investment Conferences, Sept. 27, 3p.GlobalNews item - resource nationalism
DS201112-0412
2011
Hargreaves, D.Hargreaves, D.Focus on global gemstones.Sixth Global Mining Finance Conference, held Sept. 22, in London., 4p.GlobalOverview of gemstone trade - diamonds
DS1900-0192
1903
Hargreaves, T.S.Hargreaves, T.S.General Information on Gold, Diamonds and Forest Industries of British Guiana.Georgetown:, 25P.South America, GuyanaKimberley
DS2000-0387
2000
Hargrove, U.S.Hargrove, U.S.Tectonic evolution of the eastern part of the Zambesi belt in Zimbabwe: implications for East African OrogenGeological Society of America (GSA) Abstracts, Vol. 32, No. 7, p.A-248.ZimbabweOrogeny, Geochronology
DS2003-0551
2003
Hargrove, U.S.Hargrove, U.S., Hanson, R.E., Martin, M.W., Blenkinsop, T.G., Bowring, S.A.Tectonic evolution of the Zambesi orogenic belt: geochronological, structural andPrecambrian Research, Vol. 123, 2-4, pp. 159-186.ZimbabweBlank
DS200412-0790
2003
Hargrove, U.S.Hargrove, U.S., Hanson, R.E., Martin, M.W., Blenkinsop, T.G., Bowring, S.A., Walker, N., Munyanyiwa, H.Tectonic evolution of the Zambesi orogenic belt: geochronological, structural and petrological constraints from northern ZimbabwPrecambrian Research, Vol. 123, 2-4, pp. 159-186.Africa, ZimbabweTectonics
DS1998-0577
1998
Hari, K.R.Hari, K.R.Mineralogical and petrochemical studies of the lamprophyres around Chhaktalao area, Madhya Pradesh.Journal of Geological Society India, Vol. 51, No. 1, Jan. pp. 21-30.IndiaLamprophyres
DS2000-0388
2000
Hari, K.R.Hari, K.R., Kumar, M.S., Santosh, M., Rai, S.K.Melt inclusions in olivine and pyroxene phenocrysts from lamprophyres of Chhaktalao area.Journal of Asian Earth Science, Vol. 18, No.2, Apr. pp. 155-61.India, Madhya PradeshLamprophyres
DS201706-1106
2017
Hari, K.R.Sun, S., Hou, G., Hari, K.R., Liu, S., Guan, S.Mechanism of Paleo-Mesoproterozic rifts related to breakup of Columbia supercontinent: a paleostress field modeling.Journal of Geodynamics, Vol. 107, pp. 46-60.China, Indiacraton

Abstract: The Paleo-Mesoproterozoic Zhongtiao aulacogen in the North China Craton and Cuddapah basin in the Indian Craton, have both been interpreted as intra-continental rift formed by a mantle plume that led to the breakup of Columbia supercontinent, but the mechanism has not been completely deciphered. In this paper, the mechanism of the Zhongtiao aulacogen and Cuddapah basin related to initial breakup of Columbia has been evaluated with 2D elastic finite element models of the North China Craton and the Indian Craton. The trajectories of the horizontal maximum principal compressive stress of the best-fit model fit well with the trends of dyke swarms in the North China Craton and the Indian Craton. When the other three models generated were compared with the best-fit model, it can be found that a mantle plume beneath the Zhongtiao and Cuddapah areas played the most vital role in developing the Zhongtiao aulacogen, Cuddapah basin and initial breakup of Columbia supercontinent. The boundary subduction forces, including the northern margin of the NCC, the northwest and southwest margins of the Indian Craton are indispensable factors for the rifting and breakup, whereas the mechanical properties have little influence on these modeling results. The initial breakup of Columbia supercontinent might have been resulted from the coupling between a mantle plume upwelling and some plate tectonic forces.
DS201712-2727
2018
Hari, K.R.Santosh, M., Hari, K.R., He, X-F., Han, Y-S., Manu Prasanth, M.P.Oldest lamproites from Peninsular India track the onset of Paleoproterozoic plume induced rifting and the birth of Large Igneous Province.Gondwana Research, Vol. 55, pp. 1-20.Indialamproites - Nuapada

Abstract: Potassic and ultrapotassic magmatism from deep lithospheric sources in intra-cratonic settings can be the signal of subsequent voluminous mafic magmatism and the formation of Large Igneous Provinces (LIPs) triggered by mantle plumes. Here we report for the first time, precise zircon U-Pb age data from a suite of lamproites in the Bastar Craton of central India that mark the onset of Paleoproterozoic rifting and culminating in the formation of extensive mafic dyke swarms as the bar codes of one of the major LIP events during the Precambrian evolution of the Indian shield. The lamproites from the Nuapada field occur as dismembered dykes and are composed of phenocrysts and microphenocrysts of altered olivine together with microphenocrysts of phlogopite and magnetite within a groundmass of chlorite and calcite with accessory rutile, apatite and zircon. The rocks compositionally correspond to olivine phlogopite lamproite and phlogopite lamproite. Geochemical features of the lamproites correlate with their counterparts in Peninsular India and other similar suites elsewhere in the world related to rift settings, and also indicate OIB-like magma source. The associated syenite shows subduction-related features, possibly generated in a post-collisional setting. Magmatic zircon grains with high Th/U ratios in the syenite from the Nuapada lamproite form a coherent group with an upper intercept age of 2473 ± 8 Ma representing the timing of emplacement of the magma. Zircon grains in three lamproite samples yield four distinct age groups at ca. 2.4 Ga, 2.2 Ga, 2.0 Ga and 0.8 Ga. The 2.4 Ga group corresponds to xenocrysts entrained from the syenite whereas the 2.2 Ga group is considered to represent the timing of emplacement of the lamproites. The ca. 2.0 Ga zircon grains correlate with the major thermal imprint associated with mafic magmatism and dyke emplacement in southern Bastar and the adjacent Dharwar Cratons. A few young zircon grains in the syenite and lamproites show a range of early to middle Neoproterozoic ages from 879 to 651 Ma corresponding to younger thermal event(s) as also represented by granitic veins cutting across these rocks and extensive silicification. Zircon Lu-Hf isotope data suggest magma derivation from a refertilized Paleo-Mesoarchean sub-continental lithospheric mantle, or OIB-type sources. The differences in Hf-isotope composition among the zircon grains from different age groups indicate that the mantle sources of the lamproite are heterogeneous at the regional scale. A combination of the features from geochemical and zircon Hf isotope data is consistent with asthenosphere-lithosphere interaction during the lamproite magma evolution. The timing of lamproite emplacement in central India correlates with the global 2.2 Ga record of LIPs. We link the origin of the related mantle plume to the recycling of subducted slabs associated with the prolonged subduction-accretion history prior to the Neoarchean cratonization, as well as the thermal blanket effect of the Earth’s oldest supercontinent. Pulsating plumes and continued rifting generated voluminous dyke swarms across the Bastar and Dharwar Cratons, forming part of a major global rifting and LIP event.
DS201802-0262
2018
Hari, K.R.Santosh, M., Hari, K.R., He, X-F., Han, Y-S., Manu Prasanth, M.P.Oldest lamproites from Peninsular India track the onset of Paleoproterozoic plume induced rifting and the birth of Large Igneous Province.Gondwana Research, Vol. 55, pp. 1-20.Indialamproites

Abstract: Potassic and ultrapotassic magmatism from deep lithospheric sources in intra-cratonic settings can be the signal of subsequent voluminous mafic magmatism and the formation of Large Igneous Provinces (LIPs) triggered by mantle plumes. Here we report for the first time, precise zircon U-Pb age data from a suite of lamproites in the Bastar Craton of central India that mark the onset of Paleoproterozoic rifting and culminating in the formation of extensive mafic dyke swarms as the bar codes of one of the major LIP events during the Precambrian evolution of the Indian shield. The lamproites from the Nuapada field occur as dismembered dykes and are composed of phenocrysts and microphenocrysts of altered olivine together with microphenocrysts of phlogopite and magnetite within a groundmass of chlorite and calcite with accessory rutile, apatite and zircon. The rocks compositionally correspond to olivine phlogopite lamproite and phlogopite lamproite. Geochemical features of the lamproites correlate with their counterparts in Peninsular India and other similar suites elsewhere in the world related to rift settings, and also indicate OIB-like magma source. The associated syenite shows subduction-related features, possibly generated in a post-collisional setting. Magmatic zircon grains with high Th/U ratios in the syenite from the Nuapada lamproite form a coherent group with an upper intercept age of 2473 ± 8 Ma representing the timing of emplacement of the magma. Zircon grains in three lamproite samples yield four distinct age groups at ca. 2.4 Ga, 2.2 Ga, 2.0 Ga and 0.8 Ga. The 2.4 Ga group corresponds to xenocrysts entrained from the syenite whereas the 2.2 Ga group is considered to represent the timing of emplacement of the lamproites. The ca. 2.0 Ga zircon grains correlate with the major thermal imprint associated with mafic magmatism and dyke emplacement in southern Bastar and the adjacent Dharwar Cratons. A few young zircon grains in the syenite and lamproites show a range of early to middle Neoproterozoic ages from 879 to 651 Ma corresponding to younger thermal event(s) as also represented by granitic veins cutting across these rocks and extensive silicification. Zircon Lu-Hf isotope data suggest magma derivation from a refertilized Paleo-Mesoarchean sub-continental lithospheric mantle, or OIB-type sources. The differences in Hf-isotope composition among the zircon grains from different age groups indicate that the mantle sources of the lamproite are heterogeneous at the regional scale. A combination of the features from geochemical and zircon Hf isotope data is consistent with asthenosphere-lithosphere interaction during the lamproite magma evolution. The timing of lamproite emplacement in central India correlates with the global 2.2 Ga record of LIPs. We link the origin of the related mantle plume to the recycling of subducted slabs associated with the prolonged subduction-accretion history prior to the Neoarchean cratonization, as well as the thermal blanket effect of the Earth's oldest supercontinent. Pulsating plumes and continued rifting generated voluminous dyke swarms across the Bastar and Dharwar Cratons, forming part of a major global rifting and LIP event.
DS201808-1780
2018
Hari, K.R.Putirka, K., Tao, Y., Hari, K.R., Perfit, M., Jackson, M.G., Arevalo, Jr. R.The mantle source of thermal plumes: trace and minor element & major oxides of primitive liquids ( and why olivine compositions don't matter).minoscam.org, doi.org/10.2138/am-2018-6192 59p.Mantleforsterite

Abstract: We estimate the mantle source compositions for mantle plumes, and by implication Earth’s lower mantle, by: (a) measuring trace (e.g, Sc, V, Cu) and minor (e.g., Ca, Mn, Ni) element concentrations of high forsterite olivine grains from several plume localities, (b) estimating the parent liquid compositions from which they crystallized, (c) calculating mantle potential temperatures and degrees of partial melting and (d) estimating trace element compositions of depleted and enriched mantle sources. Our sample set includes two continental flood basalt provinces (Emeishan and Deccan), a flood basalt that erupted in a continental rift setting (Baffin Island), our type example of a thermal mantle plume (Hawaii) and lavas from the Siqueiros Transform at the East Pacific Rise, which represent the mid-ocean ridge system. We also present olivine compositions for the peridotite xenoliths from Kilbourne Hole, New Mexico, USA, which are commonly used as primary and secondary analytical standards. We find that trace elements in lava-hosted olivine grains are too far removed from their mantle source to provided anything but greatly hindered views of such. Olivine compositions reflect not only evolving liquid compositions (including partial melting conditions and later fractionation), but also evolving Ol+liq partition coefficients, which mostly increase with decreasing T during crystallization. Mantle compositions, delimited by maximum forsterite contents and estimates of parental magmas (and experimentally determined partition coefficients) indicate that our selected plumes reflect some combination of (1) a depleted mantle source that is quite similar to that obtained by other methods, and (2) a variably enriched plume source that is more enriched than current estimates of pyrolite. The enriched plume mantle sources can be explained remarkably well as a mixture of subducted mid-ocean ridge basalt (MORB; Gale et al. 2013) and depleted MORB mantle (DM; Salters and Stracke 2004), with MORB:DM ratios of 1:5 to 1:4. These ratios are most sensitive to estimates of melt fraction where plume parental magmas are last equilibrated with their mantle source, but are nonetheless consistent across a wide range of chemically very different elements, and estimates of MORB and DM obtained by very different means. Baffin Island is of particular interest. Like prior studies, we verify a high mantle potential temperature (Tp) of 1630oC (compared to Tp = 1320-1420oC for MORB from Cottrell and Kelley 2011 for Ol of Fo89.3-91.4). The Baffin source is also within error the same as DM with respect to trace elements, although still isotopically distinct; Baffin appears to be sourced in something that is akin to DM that lies at the base of the mantle, where plumes acquire their excess heat. Thus while part of our analysis supports the concept of a "slab graveyard" at the bottom of the lower mantle (e.g., Wyession 1996), that cemetery is by no means ubiquitous at the CMB: subducted slabs are either unevenly interred, or efficiently excavated by later upwellings.
DS201903-0527
2019
Hari, K.R.Liao, A.C-Y., Shellnutt, J.G., Hari, K.R., Denyszyn, S.W., Vishwakarma, N., Verma, C.B.A petrogenetic relationship between 2.37 Ga boninitic dyke swarms of the Indian Shield: evidence from the Central Bastar Craton and NE Dharwar Craton.Gondwana Research, Vol. 69, pp. 193-211.Indiacraton

Abstract: The Indian Shield is cross-cut by a number of distinct Paleoproterozoic mafic dyke swarms. The density of dykes in the Dharwar and Bastar Cratons is amongst the highest on Earth. Globally, boninitic dyke swarms are rare compared to tholeiitic dyke swarms and yet they are common within the Southern Indian Shield. Geochronology and geochemistry are used to constrain the petrogenesis and relationship of the boninitic dykes (SiO2?=?51.5 to 55.7?wt%, MgO?=?5.8 to 18.7?wt%, and TiO2?=?0.30?wt% to 0.77?wt%) from the central Bastar Craton (Bhanupratappur) and the NE Dharwar Craton (Karimnagar). A single U-Pb baddeleyite age from a boninitic dyke near Bhanupratappur yielded a weighted-mean 207Pb/206Pb age of 2365.6?±?0.9?Ma that is within error of boninitic dykes from the Dharwar Craton near Karimnagar (2368.5?±?2.6?Ma) and farther south near Bangalore (2365.4?±?1.0?Ma to 2368.6?±?1.3?Ma). Rhyolite-MELTS modeling indicates that fractional crystallization is the likely cause of major element variability of the boninitic dykes from Bhanupratappur whereas trace element modeling indicates that the primary melt may be derived from a pyroxenite mantle source near the spinel-garnet transition zone. The Nd isotopes (?Nd(t)?=??6.4 to +4.5) of the Bhanupratappur dykes are more variable than the Karimnagar dykes (?Nd(t)?=??0.7 to +0.6) but they overlap. The variability of Sr-Nd isotopes may be related to crustal contamination during emplacement or is indicative of an isotopically heterogeneous mantle source. The chemical and temporal similarities of the Bhanupratappur dykes with the dykes of the Dharwar Craton (Karimnagar, Penukonda, Chennekottapalle) indicate they are members of the same giant radiating dyke swarm. Moreover, our results suggest that the Bastar and Dharwar Cratons were adjacent but likely had a different configuration at 2.37?Ga than the present day. It is possible that the 2.37Ga dyke swarm was related to a mantle plume that assisted in the break-up of an unknown or poorly constrained supercontinent.
DS201906-1346
2019
Hari, K.R.Shellnut, J.G., Hari, K.R., Liao, A.C.-Y., Denyszyn, S.W., Vishwakarama, N., Deshmukh, S.D.Petrogenesis of the 1.85 ga Sonakhan mafic dyke swrm, Bastar Craton.Lithos, Vol.334-335, pp. 88-101.Indiacraton

Abstract: The NNW trending tholeiitic Sonakhan mafic dyke swarm of the Northern Bastar Craton is comprised of basalt to basaltic andesite (SiO2?=?46.3?wt% to 55.3?wt%; Mg#?=?37 to 70) dykes. A single basaltic dyke yielded a weighted-mean 207Pb/206Pb baddeleyite age of 1851.1?±?2.6?Ma. The Sr and Nd isotopes (87Sr/86Sri?=?0.70396 to 0.70855; ?Nd(t)?=??5.7 to +2.0) are variable which is a consequence of crustal contamination. Trace element modeling suggests the dykes were likely derived by partial melting of a spinel-bearing mantle source. The Sonakhan dykes are 30 million years younger than the 1.88?Ga Bastar-Cuddapah dykes (Bastanar-Hampi swarm) of the southern and central Bastar Craton indicating they represent a distinct period of magmatism. However, much like the 1.88?Ga dykes, the Sonakhan dykes appear to be correlative with dykes from the Yilgarn Craton (Yalgoo dyke?=?1854?±?5?Ma) of Western Australia. The temporal and compositional similarity of the Sonakhan dykes with the Yalgoo dyke is evidence that they are petrologically related and may represent different branches of the same dyke swarm. The existence of two distinct Paleoproterozoic dyke swarms in the Bastar Craton that each have a correlative unit in the Yilgarn Craton is supportive of a link between India and Australia before 1.9?Ga. Moreover, it suggests that the break-up of India and Western Australia was protracted and lasted for at least 30 million years.
DS201911-2564
2019
Hari, K.R.Snatish, M., Tsunogae, T., Yang, C-X., Han, Y-S., Hari, K.R., Prasanth, M., Uthup, S.The Bastar craton, central India: a window to Archean-paleoproterozoic crustal evolution.Gondwana Research, in press available 69p. PdfIndiacraton

Abstract: The Bastar craton in central India, surrounded by cratonic blocks and Paleoproterozoic to Neoproterozoic orogenic belts, is a window to investigate the Archean-Paleoproterozoic crustal evolution and tectonic processes. Here we propose a new tectonic classification of the craton into the Western Bastar Craton (WBC), Eastern Bastar Craton (EBC), and the intervening Central Bastar Orogen (CBO). We present petrologic, geochemical and zircon U-Pb, REE and Lu-Hf data from a suite of rocks from the CBO and along the eastern margin of the WBC Including: (1) volcanic successions comprising meta-andesite and fine-grained amphibolite, representing arc-related volcanics along a convergent margin; (2) ferruginous sandstone, in association with rhyolite, representing a volcano-sedimentary succession, deposited in an active trench; and (3) metamorphosed mafic-ultramafic suite including gabbro, pyroxenite and dunite invaded by trondhjemite representing the section of sub-arc mantle and arc root adjacent to a long-lasting subduction system. Petrologic studies indicate that the mafic-ultramafic suite crystallized from an island arc tholeiitic parental magma in a suprasubduction zone environment. The chondrite-normalized and primitive mantle normalized diagrams of the mafic and ultramafic rocks suggest derivation from MORB magma. The mixed characters from N-MORB to E-MORB of the studied samples are consistent with subduction modification of a MORB related magma, involving partial melting of the metasomatized mantle wedge. Our zircon U-Pb age data suggest that the cratonic nuclei was constructed as early as Paleoarchean. We present evidence for active subduction and arc magmatism through Mesoarchean to Neoarchean and early Paleoproterozoic, with the trench remaining open until at least 2.3 Ga. Two major crust building events are recognized in the Bastar craton: during Mesoarchean (recycled Paleoarchean subduction-related as well as juvenile/depleted mantle components) and Neoarchean (accretion of juvenile oceanic crust, arc magmatism including granite batholiths and related porphyry mineralization). The final cratonization occurred during latest Paleoproterozoic, followed by collisional assembly of the craton and its incorporation within the Peninsular Indian mosaic during Mesoproterozoic. In the global supercontinent context, the craton preserves the history of Ur, the earliest supercontinent, followed by the Paleo-Mesoproterozoic Columbia, as well as minor thermal imprints of the Neoproterozoic Rodinia and associated Grenvillian orogeny.
DS202001-0037
2020
Hari, K.R.Santosh, M., Tsunogae, T., Yang, C-X., Han, T-S., Hari, K.R., Prasanth, M.P.M., Uthup, S.The Bastar craton, central India: a window to Archean - Paleoproterozic crustal evolution.Gondwana Research, Vol. 79, pp. 157-184.Indiacraton

Abstract: The Bastar craton in central India, surrounded by cratonic blocks and Paleoproterozoic to Neoproterozoic orogenic belts, is a window to investigate the Archean-Paleoproterozoic crustal evolution and tectonic processes. Here we propose a new tectonic classification of the craton into the Western Bastar Craton (WBC), Eastern Bastar Craton (EBC), and the intervening Central Bastar Orogen (CBO). We present petrologic, geochemical and zircon U-Pb, REE and Lu-Hf data from a suite of rocks from the CBO and along the eastern margin of the WBC Including: (1) volcanic successions comprising meta-andesite and fine-grained amphibolite, representing arc-related volcanics along a convergent margin; (2) ferruginous sandstone, in association with rhyolite, representing a volcano-sedimentary succession, deposited in an active trench; and (3) metamorphosed mafic-ultramafic suite including gabbro, pyroxenite and dunite invaded by trondhjemite representing the section of sub-arc mantle and arc root adjacent to a long-lasting subduction system. Petrologic studies indicate that the mafic-ultramafic suite crystallized from an island arc tholeiitic parental magma in a suprasubduction zone environment. The chondrite-normalized and primitive mantle normalized diagrams of the mafic and ultramafic rocks suggest derivation from MORB magma. The mixed characters from N-MORB to E-MORB of the studied samples are consistent with subduction modification of a MORB related magma, involving partial melting of the metasomatized mantle wedge. Our zircon U-Pb age data suggest that the cratonic nuclei was constructed as early as Paleoarchean. We present evidence for active subduction and arc magmatism through Mesoarchean to Neoarchean and early Paleoproterozoic, with the trench remaining open until at least 2.3?Ga. Two major crust building events are recognized in the Bastar craton: during Mesoarchean (recycled Paleoarchean subduction-related as well as juvenile/depleted mantle components) and Neoarchean (accretion of juvenile oceanic crust, arc magmatism including granite batholiths and related porphyry mineralization). The final cratonization occurred during latest Paleoproterozoic, followed by collisional assembly of the craton and its incorporation within the Peninsular Indian mosaic during Mesoproterozoic. In the global supercontinent context, the craton preserves the history of Ur, the earliest supercontinent, followed by the Paleo-Mesoproterozoic Columbia, as well as minor thermal imprints of the Neoproterozoic Rodinia and associated Grenvillian orogeny.
DS202003-0361
2020
Hari, K.R.Santosh, M., Tsunogae, T., Yang, C-X., Han, Y-S., Hari, K.R., Manu Prasanth, M.P., Uthup, S.The Bastar craton, central India: a window to Archean - Paleoproterozoic crustal evolution.Gondwana Research, Vol. 79, pp. 157-184.Indiacraton

Abstract: The Bastar craton in central India, surrounded by cratonic blocks and Paleoproterozoic to Neoproterozoic orogenic belts, is a window to investigate the Archean-Paleoproterozoic crustal evolution and tectonic processes. Here we propose a new tectonic classification of the craton into the Western Bastar Craton (WBC), Eastern Bastar Craton (EBC), and the intervening Central Bastar Orogen (CBO). We present petrologic, geochemical and zircon U-Pb, REE and Lu-Hf data from a suite of rocks from the CBO and along the eastern margin of the WBC Including: (1) volcanic successions comprising meta-andesite and fine-grained amphibolite, representing arc-related volcanics along a convergent margin; (2) ferruginous sandstone, in association with rhyolite, representing a volcano-sedimentary succession, deposited in an active trench; and (3) metamorphosed mafic-ultramafic suite including gabbro, pyroxenite and dunite invaded by trondhjemite representing the section of sub-arc mantle and arc root adjacent to a long-lasting subduction system. Petrologic studies indicate that the mafic-ultramafic suite crystallized from an island arc tholeiitic parental magma in a suprasubduction zone environment. The chondrite-normalized and primitive mantle normalized diagrams of the mafic and ultramafic rocks suggest derivation from MORB magma. The mixed characters from N-MORB to E-MORB of the studied samples are consistent with subduction modification of a MORB related magma, involving partial melting of the metasomatized mantle wedge. Our zircon U-Pb age data suggest that the cratonic nuclei was constructed as early as Paleoarchean. We present evidence for active subduction and arc magmatism through Mesoarchean to Neoarchean and early Paleoproterozoic, with the trench remaining open until at least 2.3?Ga. Two major crust building events are recognized in the Bastar craton: during Mesoarchean (recycled Paleoarchean subduction-related as well as juvenile/depleted mantle components) and Neoarchean (accretion of juvenile oceanic crust, arc magmatism including granite batholiths and related porphyry mineralization). The final cratonization occurred during latest Paleoproterozoic, followed by collisional assembly of the craton and its incorporation within the Peninsular Indian mosaic during Mesoproterozoic. In the global supercontinent context, the craton preserves the history of Ur, the earliest supercontinent, followed by the Paleo-Mesoproterozoic Columbia, as well as minor thermal imprints of the Neoproterozoic Rodinia and associated Grenvillian orogeny.
DS201810-2326
2018
Harigane, Y.Guotana, J.M., Morishita, T., Yamaguchi, R., Nishio, I., Tamura, A., Tani, K., Harigane, Y., Szilas, K., Pearson, D.G.Contrasting textural and chemical signatures of chromitites in the Mesoarchean Ulamertoq peridotite body, southern West Greenland.MDPI Geosciences, Researchgate 19p.Europe, Greenlandperidotite

Abstract: Peridotites occur as lensoid bodies within the Mesoarchaean orthogneiss in the Akia terrane of Southern West Greenland. The Ulamertoq peridotite body is the largest of these peridotites hosted within the regional orthogneiss. It consists mainly of olivine, orthopyroxene, and amphibole-rich ultramafic rocks exhibiting metamorphic textural and chemical features. Chromitite layers from different localities in Ulamertoq show contrasting characteristics. In one locality, zoned chromites are hosted in orthopyroxene-amphibole peridotites. Compositional zonation in chromites is evident with decreasing Cr and Fe content from core to rim, while Al and Mg increase. Homogeneous chromites from another locality are fairly uniform and Fe-rich. The mineral chemistry of the major and accessory phases shows metamorphic signatures. Inferred temperature conditions suggest that the zoned chromites, homogeneous chromites, and their hosts are equilibrated at different metamorphic conditions. In this paper, various mechanisms during the cumulus to subsolidus stages are explored in order to understand the origin of the two contrasting types of chromites.
DS201811-2575
2018
Harigane, Y.Guotana, J.M., Morishita, T., Yamaguchi, R., Nishio, I., Tamura, A., Harigane, Y., Szilas, K., Pearson, G.Contrasting textural and chemical signatures of chromitites in the Mesoarchean Ulamertoq peridotite body, southern West Greenland.Geosciences, Vol. 8, no. 9, p. 328-Europe, Greenlandperidotite

Abstract: Peridotites occur as lensoid bodies within the Mesoarchaean orthogneiss in the Akia terrane of Southern West Greenland. The Ulamertoq peridotite body is the largest of these peridotites hosted within the regional orthogneiss. It consists mainly of olivine, orthopyroxene, and amphibole-rich ultramafic rocks exhibiting metamorphic textural and chemical features. Chromitite layers from different localities in Ulamertoq show contrasting characteristics. In one locality, zoned chromites are hosted in orthopyroxene-amphibole peridotites. Compositional zonation in chromites is evident with decreasing Cr and Fe content from core to rim, while Al and Mg increase. Homogeneous chromites from another locality are fairly uniform and Fe-rich. The mineral chemistry of the major and accessory phases shows metamorphic signatures. Inferred temperature conditions suggest that the zoned chromites, homogeneous chromites, and their hosts are equilibrated at different metamorphic conditions. In this paper, various mechanisms during the cumulus to subsolidus stages are explored in order to understand the origin of the two contrasting types of chromites.
DS201905-1037
2019
Harigane, Y.Guotana, J.M., Morishita, T., Yamaguschi, R., Nishio, I., Tamura, A., Tani, K., Harigane, Y., Szilas, K., Pearson, D.G.Contrasting textural and chemical signatures of chromitites in the Mesoarchean Ulamertoq peridotite body, southern west Greenland.Geosciences ( MDPI), Vol. 8, 328- 19p.Europe, Greenlandchromitite

Abstract: Peridotites occur as lensoid bodies within the Mesoarchaean orthogneiss in the Akia terrane of Southern West Greenland. The Ulamertoq peridotite body is the largest of these peridotites hosted within the regional orthogneiss. It consists mainly of olivine, orthopyroxene, and amphibole-rich ultramafic rocks exhibiting metamorphic textural and chemical features. Chromitite layers from different localities in Ulamertoq show contrasting characteristics. In one locality, zoned chromites are hosted in orthopyroxene-amphibole peridotites. Compositional zonation in chromites is evident with decreasing Cr and Fe content from core to rim, while Al and Mg increase. Homogeneous chromites from another locality are fairly uniform and Fe-rich. The mineral chemistry of the major and accessory phases shows metamorphic signatures. Inferred temperature conditions suggest that the zoned chromites, homogeneous chromites, and their hosts are equilibrated at different metamorphic conditions. In this paper, various mechanisms during the cumulus to subsolidus stages are explored in order to understand the origin of the two contrasting types of chromites.
DS201905-1064
2019
Harigane, Y.Nishio, I., Morishita, T., Szilas, K., Pearson, G., Tani, K-I., Tamura, A., Harigane, Y., Guotana, J.M.Titanium clinohumite bearing peridotite from the Ulamertoq ultramafic body in the 3.0 Ga Akia terrane of southern west Greenland.Geosciences ( MDPI), 20p. Europe, Greenlandperidotite

Abstract: A titanian clinohumite-bearing dunite was recently found in the Ulamertoq ultramafic body within the 3.0 Ga Akia Terrane of southern West Greenland. Titanian clinohumite occurs as disseminated and discrete grains. Titanian clinohumite contains relatively high amounts of fluorine, reaching up to 2.4 wt.%. The high-Fo content of olivine (Fo93) coupled with low Cr/(Cr + Al) ratio of orthopyroxene implies that the dunite host is not of residual origin after melt extraction by partial melting of the primitive mantle. Olivine grains are classified into two types based on abundances of opaque mineral inclusions: (1) dusty inclusion-rich and (2) clear inclusion-free olivines. Opaque inclusions in coarse-grained olivines are mainly magnetite. Small amounts of ilmenite are also present around titanian clinohumite grains. The observed mineral association indicates partial replacement of titanian clinohumite to ilmenite (+magnetite) and olivine following the reaction: titanian clinohumite = ilmenite + olivine + hydrous fluid. The coexistence of F-bearing titanian clinohumite, olivine, and chromian chlorite indicates equilibration at around 800-900 °C under garnet-free conditions (<2 GPa). Petrological and mineralogical characteristics of the studied titanian clinohumite-bearing dunite are comparable to deserpentinized peridotites derived from former serpentinites. This study demonstrates the importance of considering the effects of hydration/dehydration processes for the origin of ultramafic bodies found in polymetamorphic Archaean terranes.
DS202106-0961
2021
Hariharan, A.Nathan, E.M., Hariharan, A., Florez, D., Fischer, K.M.Multi-layer seismic anisotropy beneath Greenland.Geochemistry, Geophysics, Geosystems, 10.1029/2020G C009512 17p. PdfEurope, Greenlandgeophysics - seismic

Abstract: Measurements of seismic anisotropy (the direction-dependent variation in seismic wavespeed) provide useful information about the orientation of deformation in the Earth. We measured seismic anisotropy using shear waves refracted through the outer core and recorded by stations in Greenland. Due to new stations and data, this study includes more measurements of the effects of anisotropy than previously possible. We show that a model with two layers of anisotropy explains dominant patterns in the fast vibration direction of the shear waves as a function of the angle at which they approach each station. We suggest that the shallow layer reflects coherent deformation in the continental lithosphere of Greenland due to its history of plate collisions and that the lower layer reflects deformation in the asthenospheric mantle induced by the motion of the plate above or a second layer of lithospheric anisotropy.
DS2003-0552
2003
Harijan, N.Harijan, N., Sen, A.K., Sarkar, S., Das, J.D., Kanungo, D.P.Geomorphotectonic around the Sung Valley carbonatite complex, Shillong PlateauGeological Society of India Journal, Vol. 62, 1, pp. 103-109.IndiaCarbonatite
DS2003-0553
2003
Harijan, N.Harijan, N., Sen, A.K., Sarkar, S., Das, J.D., Kanungo, D.P.Geomorphotectonics around the Sung Valley carbonatite Complex Shillong Plateau NEJournal of the Geological Society of India, Vol. 62, 1, July, pp. 103-109.India, northeastCarbonatite
DS200412-0791
2003
Harijan, N.Harijan, N., Sen, A.K., Sarkar, S., Das, J.D., Kanungo, D.P.Geomorphotectonics around the Sung Valley carbonatite Complex Shillong Plateau NE India: a remote sensing and GIS approach.Journal of the Geological Society of India, Vol. 62, 1, July, pp. 103-109.IndiaTectonics Carbonatites
DS2000-0389
2000
Harikumar, P.Harikumar, P., Rajaram, M., Balakrishnan, T.S.Aeromagnetic study of peninsular IndiaProceedings Indian Academy of Science, Vol. 109, No. 3, Sept pp. 381-91.IndiaGeophysics - magnetics
DS1986-0703
1986
Harinarayana, T.Sarma, S.V.S., Harinarayana, T., Venogopala, Krishna, C., SankerTellurics in the exploration of kimberlite pipes- an experimental studyCurrent Science, Vol. 55, No. 3, pp. 133-136IndiaWajrakarur, LattavaraM., Geophysics
DS1987-0648
1987
Harinarayana, T.Sarma, S.V.S., Harinarayana, T., Gopalakrishna, C.V.et al.Tellurics in the detection and delineation of lineament features In kimberlite areas, an experimental approachIntegrated Geophysical Exploration for Mineral Deposits, Baroda, Vol. 13, p. A30. (Abstract)IndiaGeophysics -Tellurics, Kimberlite
DS200512-1132
2005
Harinarayana, T.Veeraswamy, K., Harinarayana, T.Electrical signatures due to thermal anomalies along mobile belts reactivated by the trail and outburst of mantle plume: evidences from the Indian subcontinent.Journal of Applied Geophysics, In pressIndiaGeophysics - geodynamics, geothermometry
DS200612-0531
2006
Harinarayana, T.Harinarayana, T., Naganjaneyulu, K., Patro, B.P.K.Detection of a collision zone in south Indian Shield region from magnetotelluric studies.Gondwana Research, Vol. 10, Aug.1-2, pp. 48-56.IndiaGeophysics - tellurics
DS200612-1473
2006
Harinarayana, T.Veeraswamy, K., Harinarayana, T.Electrical signatures due to thermal anomalies along mobile belts reactivated by the trail and outburst of mantle plume: evidence from the Indian subcontinent.Journal of Applied Geophysics, Vol. 58, 4, April, pp. 313-320.IndiaGeodynamics, geothermometry
DS202108-1280
2021
Harinova, M.Eaton-Magana, S., Johnson, P., Barrie, E., Harinova, M.Bicolor rough diamond crystals. ( pink)Gems & Gemology , Vol. 57, 1, pp. 53-55.Australiadiamond colour
DS2002-1536
2002
Haris, J.W.Stachel, T., Haris, J.W., Aulbach, S., deines, P.Kankan diamonds III: delta 13 C and nitrogen characteristics of deep diamondsContributions to Mineralogy and Petrology, Vol. 142, No. 4, pp. 465-75.GuineaGeochronology, Deposit - Kankan
DS1950-0391
1958
HarishchandraHarishchandraThe Diamond Field of Panna, M.pMineral Wealth of Madhya Pradesh., Vol. 1, No. 1, PP. 12-16.India, Madhya PradeshBlank
DS2000-0097
2000
Harjes, H.P.Bokelmann, G.H.R., Harjes, H.P.Evidence for temporal variation of seismic velocity within the upper continental crust.Journal of Geophysical Research, Vol. 105, No.B 10, Oct.10, pp.23879-MantleGeophysics - seismics
DS201706-1076
2017
Hark, R.R.Harmon, R.S., Hark, R.R., Throckmorton, C.S., Rankey, E.C., Wise, M.A., Somers, A.M., Collins, L.M.Geochemical fingerprinting by handheld laser-induced breakdown spectroscopy. (LIBS)Geostandards and Geoanalytical Research, in press availableTechnologyspectroscopy

Abstract: A broad suite of geological materials were studied a using a handheld laser-induced breakdown spectroscopy (LIBS) instrument. Because LIBS is simultaneously sensitive to all elements, the full broadband emission spectrum recorded from a single laser shot provides a ‘chemical fingerprint’ of any material - solid, liquid or gas. The distinguishing chemical characteristics of the samples analysed were identified through principal component analysis (PCA), which demonstrates how this technique for statistical analysis can be used to identify spectral differences between similar sample types based on minor and trace constituents. Partial least squares discriminant analysis (PLSDA) was used to distinguish and classify the materials, with excellent discrimination achieved for all sample types. This study illustrates through four selected examples involving carbonate minerals and rocks, the oxide mineral pair columbite-tantalite, the silicate mineral garnet and native gold how portable, handheld LIBS analysers can be used as a tool for real-time chemical analysis under simulated field conditions for element or mineral identification plus such applications as stratigraphic correlation, provenance determination and natural resources exploration.
DS201112-0191
2011
Harkley, S.L.Clark, C., Fitzsimons, I.C.W., Healy, D., Harkley, S.L.How does the continental crust get really hot?Elements, Vol. 7, 4, August pp. 235-240.MantleMetamorphism, UHT, thermal modelling
DS2001-0579
2001
HarlamKarlstrom, R.E., Ahall, Harlam, Williams, McLellandLong lived (1.8-1.0) Ga convergent Orogen in southern Laurentia: its extensions to Australia and Baltica....Precambrian Research, Vol. 111, No. 1-4, pp. 5-30.Australia, Norway, BalticaRodinia - tectonics, Orogeny
DS1989-0589
1989
Harlan, S.S.Harlan, S.S., Geissman, J.W., Snee, L.W., Schmidt, C.J.Paleomagnetism of Proterozoic mafic dikes, southwest Montana foreland, USANew Mexico Bureau of Mines Bulletin., Continental Magmatism Abstract Volume, Held, Bulletin. No. 131, p. 121 Abstract held June 25-July 1MontanaPaleomagnetics, Dike
DS1991-0667
1991
Harlan, S.S.Harlan, S.S., Mehnert, H.H., Snee, L.W., Meen, J.K.Preliminary isotopic (K-Ar and 40Ar/38Ar) age determinations from selected Late Cretaceous and Tertiary igneous rocks in MontanaGuidebook of the Central Montana Alkalic Province, ed. Baker, D.W., Berg. R., No. 100, pp. 136. extended abstractMontanaGeochronology, Igneous rocks
DS1992-1141
1992
Harlan, S.S.O'Neill, J.M., Harlan, S.S.Montana has an early Proterozoic historyGeological Society of America (GSA) Abstract Volume, Vol. 24, No. 6, May p. 56. abstract onlyMontanaProterozoic, Wyoming Province
DS1995-1434
1995
Harlan, S.S.Park, J.K., Buchan, K.L., Harlan, S.S.A proposed giant radiating dyke swarm fragmented by the separation of Laurentia and Australia -PaleomagnetismEarth and Planetary Science Letters, Vol. 132, pp. 129-39Canada, Wyoming, AustraliaDike swarm, Plume source, Paleomagnetics
DS1996-0599
1996
Harlan, S.S.Harlan, S.S., Geissman, J.W., Snee, L.W., Reynolds, R.L.Late Cretaceous remagnetization of Proterozoic mafic dikes southern Highland Mountains southwest Montana -Ar40 Ar39Geological Society of America (GSA) Bulletin., Vol. 108, No. 6, June pp. 653-668.MontanaGeochronology, Paleomagnetics -Highland Mountains
DS1999-0180
1999
Harlan, S.S.Dudas, F.O., Harlan, S.S.An ancient depleted mantle sample from a 42 Ma dike in Montana: constraints on persistence of the lithosphere.Journal of Geology, Vol. 107, No. 3, May pp. 287-300.MontanaMagmatism - Eocene, Wyoming Province, geochronology
DS200612-0532
2006
Harlan, S.S.Harlan, S.S.40Ar 39 Ar dates from alkaline intrusions in the northern Crazy Mountains, Montana: implications for the timing and duration of alkaline magmatism .. centralRocky Mountain Geology, Vol. 41, 1, pp. 45-United States, MontanaAlkalic
DS1990-0659
1990
Harland, W.B.Harland, W.B., et al.A geologic time scale 1989Cambridge University Press, GlobalGeologic time scale, Book -ad
DS1986-0815
1986
Harlem, C.L.Treves, S.B., Harlem, C.L.The Elk Creek carbonatite, Pawnee county, NebraskaProceedings Nebraska Acad. Sciences, Vol. 96, p. 52. abstract onlyNebraskaCarbonatite
DS1991-0668
1991
Harley, M.Harley, M., Charlesworth, E.G.Thrust deformation in a pre-Bushveld sill, eastern TransvaalEconomic Geology Research Unit, No. 237, 11pSouth AfricaBushveld, Tectonics, structure
DS1989-1605
1989
Harley, P.West, G.F., Harley, P., Green, A.G., Milkereit, B., Cook, F., GeisReflection seismic profiling of the Kapuskasing structural zoneGeological Association of Canada (GAC) Annual Meeting Program Abstracts, Vol. 14, p. A124. (abstract.)OntarioTectonics, Kapuskasing Zone
DS1981-0201
1981
Harley, S.L.Harley, S.L.Petrogenesis of Eclogite Inclusions in the Moses Rock Dyke, utah, United States (us)Tschermaks Mineralogische und Petrographische Mitteilungen MITTEILUNGEN., Vol. 28, No. 2, PP. 131-155.United States, Utah, Colorado PlateauBlank
DS1982-0248
1982
Harley, S.L.Harley, S.L., Green, D.H.Garnet Ortho Pyroxene Barometry for Granulites and Peridotites.Nature., Vol. 300, No. 5894, PP. 697-701.AustraliaGenesis, Related Rocks
DS1982-0249
1982
Harley, S.L.Harley, S.L., Green, D.H.garnet-orthopy roxene Barometry for Granulites and PeridotiteNature., Vol. 300, No. 5894, Dec. 23RD., PP. 697-701.GlobalBlank
DS1984-0341
1984
Harley, S.L.Harley, S.L.An Experimental Study of the Partioning of Iron and Magnesium Between Garnet and Orthopyroxene.Contributions to Mineralogy and Petrology, Vol. 86, No. 4, PP. 359-373.GlobalMineralogy, Pyrope
DS1984-0342
1984
Harley, S.L.Harley, S.L., Thompson, A.B.Xenolithic Mineral Assemblages in Kimberlites, Paleogeotherms and the Thermal Structure of the Mantle.Proceedings of Third International Kimberlite Conference, Vol. 2, PP. 276-287.GlobalGenesis, Geothermometry, Geobarometry
DS1989-0590
1989
Harley, S.L.Harley, S.L.The origins of granulites: a metamorphic perspectiveGeological Magazine, Vol. 126, No. 3, May pp. 215-247GlobalGranulites, metamorphism
DS1990-0660
1990
Harley, S.L.Harley, S.L., Odling, N.W.A.Mantle geochemistry: reducing mantle redox optionsNature, Vol. 348, No. 6300, November 29, pp. 394-395GlobalMantle, Geochemistry
DS1993-0329
1993
Harley, S.L.Dawson, J.B., Harley, S.L., Rudnick, R.L., Ireland, T.Granulite xenoliths from the Lace kimberlite, South Africa: examples of the Archean lower crust beneath the Kaapvaal craton.The Xenolith window into the lower crust, abstract volume and workshop, p. 7.South AfricaLace Kimberlite
DS1995-0748
1995
Harley, S.L.Harley, S.L.Tectonics: upwardly mobile hot crustNature, Vol. 375, No. 6531, June 8, pp. 451-452MantleTectonics, Hot plumes
DS1995-0749
1995
Harley, S.L.Harley, S.L.Tectonics: upwardly mobile hot crustNature, Vol. 375, No. 6531, June 8, p. 451.MantleTectonics, Mantle plume
DS1995-0750
1995
Harley, S.L.Harley, S.L., Carswell, D.A.Ultradeep crustal metamorphism: a prospective viewJournal of Geophysical Research, Vol. 100, No. B5, May 10, pp. 8367-80.MantleCrust - metamorphism, quartz coesite, graphite diamond
DS1997-0255
1997
Harley, S.L.Dawson, J.B., Harley, S.L., Ireland, T.R.Equilibration and reaction in Archean quartz sapphirine granulite xenoliths from Lace kimberlite pipe.Journal of Met. Geology, Vol. 15, No. 2, Mar. 1, pp. 253-266.South AfricaXenoliths, Deposit - Lace
DS1998-0578
1998
Harley, S.L.Harley, S.L.On the occurrence and characterization of ultrahigh temperature crustalmetamorphismWhat drives metamorphism, Geological Society of London Special Paper No. 138, pp. 81-108.GlobalMetamorphism - not specific to diamonds
DS1998-0579
1998
Harley, S.L.Harley, S.L.Ultra high temperature metamorphism in the Gondwana fragments: evidence fora Pan-African plume.Journal of African Earth Sciences, Vol. 27, 1A, p. 105-6. AbstractGondwanaHot spot, metamorphism
DS2003-0613
2003
Harley, S.L.Hutchinson, M.T., Nixon, P.H., Harley, S.L.Corundum inclusions in diamonds - discriminatory criteria and a corundum8ikc, Www.venuewest.com/8ikc/program.htm, Session 3, POSTER abstractBrazilDiamonds, Deposit - Rio Aripuana, Juina
DS200412-0862
2004
Harley, S.L.Hutchison, M.T., Nixon, P.H., Harley, S.L.Corundum inclusions in diamonds - discriminatory criteria and a corundum compositional dataset.Lithos, Vol. 77, 1-4, Sept. pp. 273-286.South America, Brazil, JuinaRuby inclusions, nickel, mantle metasomatism
DS200612-0533
2006
Harley, S.L.Harley, S.L.The hottest crust.Geochimica et Cosmochimica Acta, Vol. 70, 18, p. 10. abstract only.MantleGeothermometry
DS200812-0447
2008
Harley, S.L.Harley, S.L.Refining the P-T records of UHT crustal metamorphism.Journal of Metamorphic Geology, Vol. 26, 2, pp. 25-154.TechnologyUHT
DS200912-0160
2009
Harley, S.L.Dawson, J.B., Harley, S.L.Some post-equilibrium reactions in kimberlite derived eclogites.Lithos, In press availableTechnologyEclogite
DS200612-0534
2006
Harlou, R.Harlou, R., Pearson, D.G., Davidson, J.P., Kamenetsky, V.S., Yaxley, G.M.Source variability and crustal contamination of the Baffin Island picrites - coupled Sr isotope and trace element study of individual melt inclusions.Geochimica et Cosmochimica Acta, Vol. 70, 18, 1, p. 11, abstract only.Canada, Nunavut, Baffin IslandPicrite
DS200712-0217
2007
Harlou, R.Davidson, J.P., Morgan, D.J., Charlier, B.L.A., Harlou, R., Hora, J.M.Microsampling and isotopic analysis of igneous rocks: implications for the study of magmatic systems.Annual Review of Earth and Planetary Sciences, Vol. 35, pp. 273-311.TechnologyGeochronology, magmatism
DS200712-0218
2007
Harlou, R.Davidson, J.P., Morgan, D.J., Charlier, B.L.A., Harlou, R., Hora, J.M.Microsampling and isotopic analysis of igneous rocks: implications for the study of magmatic systems.Annual Review of Earth and Planetary Sciences, Vol. 35, pp. 273-311.MantleMagmatism
DS200712-0821
2007
Harlou, R.Pearson, D.G., Harlou, R., Hayman, P., Cartigny, P., Kopylova, M.Sr isotopic compositions of ultra deep inclusions in diamonds: implications for mantle chemical structure and evolution.Plates, Plumes, and Paradigms, 1p. abstract p. A769.MantleUHP
DS200912-0281
2009
Harlou, R.Harlou, R., Pearson, D.G., Nowell, G.M., Ottley, C.J., Davidson, J.P.Combined Sr isotope and trace element analysis of melt inclusions at sub-ng levels using micro-milling, TIMS and ICPMS.Chemical Geology, Vol. 260, 3-4, pp. 254-268.TechnologyGeochronology
DS200912-0282
2009
Harlov, D.E.Harlov, D.E., Marschall, H.R.Mechanisms of metasomatic reactions.Mineralogy and Petrology, Vol. 95, 3-4, pp. 159-161.MantleMetasomatism
DS201702-0228
2017
Harlov, D.E.Milani, L., Bolhar, R., Frei, D., Harlov, D.E., Samuel, V.O.Light rare earth element systematics as a tool for investigating the petrogenesis of phoscorite-carbonatite associations, as exemplified by the Phalaborwa Complex, South Africa.Mineralium Deposita, in press available, 21p.Africa, South AfricaDeposit - Phalaborwa

Abstract: In-situ trace element analyses of fluorapatite, calcite, dolomite, olivine, and phlogopite have been undertaken on representative phoscorite and carbonatite rocks of the Palaeoproterozoic Phalaborwa Complex. Textural and compositional characterization reveals uniformity of fluorapatite and calcite among most of the intrusions, and seems to favor a common genetic origin for the phoscorite-carbonatite association. Representing major repositories for rare earth elements (REE), fluorapatite and calcite exhibit tightly correlated light REE (LREE) abundances, suggesting that partitioning of LREE into these rock forming minerals was principally controlled by simple igneous differentiation. However, light rare earth element distribution in apatite and calcite cannot be adequately explained by equilibrium and fractional crystallization and instead favors a complex crystallization history involving mixing of compositionally distinct magma batches, in agreement with previously reported mineral isotope variability that requires open-system behaviour.
DS201709-2038
2017
Harlov, D.E.Nasdala, L., Broska, I., Harlov, D.E., Macdonald, R.Recent progress in the study of accessory minerals. Outline of special volume.Mineralogy and Petrology, Vol. 111, 4, pp. 431-433.Technologymineralogy

Abstract: Accessory minerals are a common species in igneous and metamorphic rocks that are not considered characteristic of the host rock and hence do not affect its root name. Accessories tend to be complex in terms of their chemical and isotopic composition and their structural state. In spite of not being major rock constituents, they are, however, of enormous petrologic interest as they contain a record of the formation and post-formation history of their host rock. The study of accessory minerals hence has increased continuously during the past years, and still increases (Fig. 1). Recent progress is driven by new analytical opportunities of (in situ) micro-techniques. More and more the internal textures, that is, elemental, isotopic, and/or structural distribution patterns within individual grains, have come into the focus of researchers; a few examples are compiled in Fig. 2.
DS201312-0883
2013
Harlow, G.Stern, R.J., Tsujimori, T., Harlow, G., Groat, L.A.Plate tectonic gemstones. ( Jade and Ruby)Geology, in press availableTechnologyGemstones
DS202106-0941
2021
Harlow, G.Harlow, G.The American Museum of Natural History Gem exhibit.Gems&Jewellery, Vol. 30, 1, pp. 18-20.United States, New YorkGem exhibit
DS1982-0250
1982
Harlow, G.E.Harlow, G.E., Dowty, E.K-bearing Omphacite: Significance for Mantle AssemblagesGeological Society of America (GSA), Vol. 14, No. 7, P. 507, (abstract.).GlobalEclogite
DS1987-0478
1987
Harlow, G.E.Miller, G.H., Rossman, G.R., Harlow, G.E.The natural occurrence of hydroxide in olivinePhysics and Chemistry of Minerals, Vol. 14, No. 5, pp. 461-472GlobalKimberlite
DS1991-0669
1991
Harlow, G.E.Harlow, G.E., Veblen, D.R.Potassium in clinopyroxene inclusions from diamondsScience, Vol. 251, No. 4994, February 8, pp. 652-655GlobalDiamond inclusions, PotassiuM.
DS1992-0668
1992
Harlow, G.E.Harlow, G.E.Potassium in clinopyroxene at high pressureGeological Society of America (GSA) Abstracts with programs, 1992 Annual, Vol. 24, No. 7, abstract p. A129GlobalMineral chemistry, Clinopyroxene
DS1997-0474
1997
Harlow, G.E.Harlow, G.E.The nature of diamonds.Book produced for diamond exhibition Nov.1 -April16, 1998 New York.American Museum of History, Publishing Cambridge Press, 278p. approx. $ 30.00 United StatesGlobalDiamond pictoral, Contributions from Fritsch, Kirkley, Levinson, Zucker
DS1998-0580
1998
Harlow, G.E.Harlow, G.E.Interpretation if Kcpx and CaEs in clinopyroxene from diamond inclusion sand mantle samples.7th International Kimberlite Conference Abstract, pp. 299-301.MantleClinopyroxenes, Petrology - experimental
DS2002-0990
2002
Harlow, G.E.Mancini, F., Harlow, G.E., Cahill, C.The crystal structure and cation ordering of phase... ( K and H bearing silicate phase in the mantle)American Mineralogist, Vol. 87, pp. 302-6.MantlePetrology - exprimental
DS2003-0554
2003
Harlow, G.E.Harlow, G.E., Davies, R.Status report on K rich phases at upper mantle8 Ikc Www.venuewest.com/8ikc/program.htm, Session 6, POSTER abstractmantleBlank
DS200412-0792
2003
Harlow, G.E.Harlow, G.E., Davies, R.Status report on K rich phases at upper mantle.8 IKC Program, Session 6, POSTER abstractMantleMantle petrology
DS200412-0793
2004
Harlow, G.E.Harlow, G.E., Davies, R.Status report on stability of K rich phases at mantle conditions.Lithos, Vol. 77, 1-4, Sept. pp. 647-653.TechnologyDiamond inclusions, experimental petrology, potassium
DS200512-0216
2005
Harlow, G.E.Davies, R.M., Harlow, G.E.Transition zone origins for olivine inclusions in diamond?GAC Annual Meeting Halifax May 15-19, Abstract 1p.MantlePyrolic, peridotitic, eclogitic
DS200512-0659
2005
Harlow, G.E.Lu, P.J., Yao, N., So, J.F., Harlow, G.E., Lu, J.F., Wang, G.F., Chaikin, P.M.The earliest use of corundum and diamond in prehistoric China.Archeometry, Vol. 47,1, Feb. pp. 1-12. Blackwell PublicationsChinaHistory
DS200612-1442
2006
Harlow, G.E.Tsujimori, T., Sisson, V.B., Liou, J.G., Harlow, G.E., Sorensen, S.S.Windows to the very low temperature subduction process: a review of worldwide lawsonite eclogites.International Mineralogical Association 19th. General Meeting, held Kobe, Japan July 23-28 2006, Abstract p.207.MantleSubduction
DS201012-0075
2010
Harlow, G.E.Brusentsova, T.N., Peale, R.E., Maukonen, D., Harlow, G.E., Boesenberg, J.S., Ebel, D.Far infrared spectroscopy of carbonate minerals.American Mineralogist, Vol. 95, pp. 1515-1522.TechnologyIR - not specific to diamonds
DS201412-0340
2014
Harlow, G.E.Harlow, G.E.Diamond: the super mineral.Rocks and Minerals, Jan-Feb. pp. 35-41.TechnologyDiamond uses
DS201507-0315
2015
Harlow, G.E.Harlow, G.E., Tsujimori, T., Sorensen, SS.Jadeites and plate tectonics.Annual Review of Earth and Planetary Sciences, Vol. 43, pp. 105-138.MantleJadeites
DS201607-1300
2016
Harlow, G.E.Harlow, G.E., Tsujimori, T., Sorenson, S.S.Jadeites and plate tectonics.Annual Review of Earth and Planetary Sciences, Vol. 43, pp. 105-138.MantleJadeites

Abstract: Jadeitite is a relatively rare, very tough rock composed predominantly of jadeite and typically found associated with tectonic blocks of high-pressure/low-temperature metabasaltic rocks (e.g., eclogite, blueschist) in exhumed serpentinite-matrix mélanges. Studies over the past ?20 years have interpreted jadeitite either as the direct hydrous fluid precipitate from subduction channel dewatering into the overlying mantle wedge or as the metasomatic replacement by such fluids of oceanic plagiogranite, graywacke, or metabasite along the channel margin. Thus, jadeitites directly sample and record fluid transport in the subduction factory and provide a window into this geochemical process that is critical to a major process in the Earth system. They record the remarkable transport of large ion lithophile elements, such as Li, Ba, Sr, and Pb, as well as elements generally considered more refractory, such as U, Th, Zr, and Hf. Jadeitite is also the precious form of jade, utilized since antiquity in the form of tools, adornments, and symbols of prestige.
DS201610-1867
2015
Harlow, G.E.Harlow, G.E., Sofianides, A.S.Gems & Crystals from one of the World's great collections. American Museum of Natural HistoryAmerican Mineralogist, Vol. 101, p. 2132.GlobalBook review
DS2002-0991
2002
Harlowm G.E.Mancini, F., Harlowm G.E., Cahill, C.The crystal structure and cation ordering of phase .... a potential K and H bearing phase in the mantle.American Mineralogist, Vol.87, 2-3,,pp. 302-6.MantleMineralogy
DS200512-0401
2005
Harman, P.Harman, P., et al.The Falcon TM airborne gravity system as an exploration driver in Australia.PACRIM 2004 Conference Proceedings, www.shop.ausimm.com.auAustraliaGeophysics - gravity
DS201904-0719
2019
Harmand, M.Boulard, E., Harmand, M., Guyot, F., Lelong, G., Morard, D., Cabaret, D., Boccato, S., Rosa, A.D., Briggs, R., Pascarelli, S., Fiquet, G.Ferrous iron under oxygen rich conditions in the deep mantle.Geophysical Research Letters, Vol. 46, 3, pp. 1348-1356.MantleUHP

Abstract: Iron oxides are important end?members of the complex materials that constitute the Earth's interior. Among them, FeO and Fe2O3 have long been considered as the main end?members of the ferrous (Fe2+) and ferric (Fe3+) states of iron, respectively. All geochemical models assume that high oxygen concentrations are systematically associated to the formation of ferric iron in minerals. The recent discovery of O22? peroxide ions in a phase of chemical formula FeO2Hx stable under high?pressure and high?temperature conditions challenges this general concept. However, up to now, the valences of iron and oxygen in FeO2Hx have only been indirectly inferred from a structural analogy with pyrite FeS2. Here we compressed goethite (FeOOH), an Fe3+?bearing mineral, at lower mantle pressure and temperature conditions by using laser?heated diamond?anvil cells, and we probed the iron oxidation state upon transformation of FeOOH in the pressure-temperature stability field of FeO2Hx using in situ X?ray absorption spectroscopy. The data demonstrate that upon this transformation iron has transformed into ferrous Fe2+. Such reduced iron despite high oxygen concentrations suggests that our current views of oxidized and reduced species in the lower mantle of the Earth should be reconsidered.
DS200612-0528
2006
HarmerHanson, R.E., Harmer,Blenkinsop, Bullen, Dalziel, Gose, Hall, Kampunzu, Key, Mukwakwami, Munyaniwa, Pancake, Seidel, WardMesoproterozoic intraplate magmatism in the Kalahari Craton: a review.Journal of African Earth Sciences, In press available,Africa, South AfricaAlkaline rocks, carbonatite, Premier kimberlite cluster
DS1988-0290
1988
Harmer, R.D.Harmer, R.D., Talma, S.Isotope geochemistry of mid-Proterozoic carbonatite complexes from SouthAfrica: implications for the composition of the Proterozoic sub-continentalmantleV.m. Goldschmidt Conference, Program And Abstract Volume, Held May, p. 46. AbstractSouth AfricaBlank
DS1985-0264
1985
Harmer, R.E.Harmer, R.E.A Strontium Isotope Study of Transvaal CarbonatitesTransactions Geological Society of South Africa, Vol. 88, pt. 2, May-August p. 471. abstractSouth AfricaCarbonatite
DS1985-0265
1985
Harmer, R.E.Harmer, R.E.RbSr isotopic study of units of the Pienaars Rover alkaline complex north of Pretoria South AfricaTransactions Geological Society of South Africa, Vol. 88, pt. 2, May-August pp. 215-224South AfricaBlank
DS1986-0834
1986
Harmer, R.E.Verwoerd, W.J., Weder, E., Harmer, R.E.The Stukpan carbonatite: a new discovery in the Orange Free State GoldFieldGeocongress 86 abstract volume, pp. 899-902South AfricaCarbonatite
DS1993-0399
1993
Harmer, R.E.Eglington, B.M., Harmer, R.E.A review of the statistical principles of geochronology: II. additional concepts pertinent to radiogenic uranium-lead (U-Pb) (U-Pb) studies.South Africa Journal of Geology, Vol. 96, No. 1-2, pp. 9-21.GlobalGeochronology, Review of uranium-lead (U-Pb) (U-Pb) studies
DS1993-0629
1993
Harmer, R.E.Harmer, R.E.Petrogenesis of the Spitskop and other related alkaline intrusionsUniversity of of Cape Town, Ph.d. thesisSouth AfricaAlkaline rocks, Thesis
DS1993-0630
1993
Harmer, R.E.Harmer, R.E.The petrogenetic association between carbonatite and alkaline magmatism:isotopic constraintsTerra Abstracts, IAGOD International Symposium on mineralization related to mafic, Vol. 5, No. 3, abstract supplement p. 20South AfricaCarbonatite, Spitskop Complex
DS1993-1663
1993
Harmer, R.E.Verwoerd, W.J., Weder, E.E., Harmer, R.E.The Stukpan carbonatite in the Orange Free State GoldfieldSouth African Journal of Geology, Vol. 96, No. 3, Sept. pp. 108-118.South AfricaCarbonatite, Stukpan
DS1994-0713
1994
Harmer, R.E.Harmer, R.E.The petrogenetic relationships between magnesium and Calcium carbonatites and their associated silicate rock types.Geological Association of Canada (GAC) Abstract Volume, Vol. 19, p.GlobalCarbonatite, Petrogenesis
DS1995-0639
1995
Harmer, R.E.Gittins, J., Harmer, R.E.The origin of periclase bearing carbonatitesGeological Society Africa 10th. Conference Oct. Nairobi, p. 112-3. AbstractTanzaniaCarbonatite -periclase, Deposit -Kerimasi
DS1995-0640
1995
Harmer, R.E.Gittins, J., Harmer, R.E.Evolutionary paths of carbonatite magmasGeological Society Africa 10th. Conference Oct. Nairobi, p. 111-2. AbstractTanzaniaCarbonatite, Calcite or dolomite Carbonatite
DS1995-0751
1995
Harmer, R.E.Harmer, R.E., Gittins, J.Carbonatites: primary or secondary magma types?Geological Society Africa 10th. Conference Oct. Nairobi, p. 110. AbstractSouth Africa, TanzaniaCarbonatite
DS1995-0752
1995
Harmer, R.E.Harmer, R.E., Lee, C.A.Dorowa and Shawa carbonatites, ZimbabweGeological Society Africa 10th. Conference Oct. Nairobi, p. 123. Abstract.ZimbabweCarbonatite, Deposit -Dorowa, Shawa
DS1996-0600
1996
Harmer, R.E.Harmer, R.E.Experimental and isotopic evidence for the source and petrogenesis ofcarbonatites.International Geological Congress 30th Session Beijing, Abstracts, Vol. 2, p. 400.GlobalCarbonatite, Geochronology
DS1997-0417
1997
Harmer, R.E.Gittins, J., Harmer, R.E.What is a ferrocarbonatite? A revised classificationJournal of African Earth Sciences, Vol. 25, No. 1, July pp. 159-GlobalCarbonatite, Ferrocarbonatite - definition
DS1997-0418
1997
Harmer, R.E.Gittins, J., Harmer, R.E.Dawson Oldoinyo Lengai calciocarbonatite - a magmatic sovite or an extremely altered natrocarbonatite.Mineralogical Magazine, Vol. 61, No. 3, June pp. 351-355.TanzaniaCarbonatite
DS1997-0475
1997
Harmer, R.E.Harmer, R.E.The case for carbonatites as primary magmasGeological Association of Canada (GAC) Abstracts, GlobalCarbonatite, Magmas
DS1997-0476
1997
Harmer, R.E.Harmer, R.E., Gittins, J.Dolomitic carbonatite parental magmasGeological Association of Canada (GAC) Abstracts, GlobalCarbonatite, Magma - genesis
DS1997-0477
1997
Harmer, R.E.Harmer, R.E., Gittins, J.The origin of dolomitic carbonatites: field and experimental constraintsJournal of African Earth Sciences, Vol. 25, No. 1, July pp. 5-28.South AfricaCarbonatite
DS1998-0581
1998
Harmer, R.E.Harmer, R.E.Carbonatite magmas in the mantle: evidence and relationship to orangeites and lamproites.7th International Kimberlite Conference Abstract, pp. 302-304.MantleCarbonatite, Geochronology
DS1998-0582
1998
Harmer, R.E.Harmer, R.E., Eglinton, B.M.A deep mantle source for carbonatite magmatism: evidence from the nephelinites and carbonatites...Earth and Planetary Science Letters, Vol. 158, No. 3-4, May 30, pp. 131-142.ZimbabweBuhera District, Carbonatite, magmatism
DS1998-0583
1998
Harmer, R.E.Harmer, R.E., Gittins, J.The case for primary, mantle derived carbonatite magmaJournal of Petrology, Vol. 39, No. 11-12, Nov-Dec. pp. 1895-04.AfricaCarbonatite, Napak, Kerimasi, Shombole, Dorova, Shawa, Magmatism, Spiskop
DS1999-0288
1999
Harmer, R.E.Harmer, R.E.The petrogenetic association of carbonatite and alkaline magmatism:constraints from Spitskop Complex.Journal of Petrology, Vol. 40, No. 4, Apr. 1, pp. 525-48.South AfricaCarbonatite - petrology, genesis, Spitskop Complex
DS2000-0390
2000
Harmer, R.E.Harmer, R.E., Hayward, G., Siegfried, P., Gittins, J.The geology and economic potential of the Xiluvo carbonatite complex, Mozambique.Igc 30th. Brasil, Aug. abstract only 1p.GlobalCarbonatite, Deposit - Xiluvo
DS2001-0384
2001
Harmer, R.E.Gittins, J., Harmer, R.E.The carbonatite alkalic silicate igneous rock association: an unfortunate and misleading assumption.Journal of South African Earth Sciences, Vol. 32, No. 1, p. A 16 (abs)Zimbabwe, South AfricaCarbonatite, Genesis
DS2001-0448
2001
Harmer, R.E.Harmer, R.E.Evidence for magmatic crystallization of ferroan dolomite at shallow depths in the Bulhoek carbonatite.Journal of South African Earth Sciences, Vol. 32, No. 1, p. A 18 (abs)Southern AfricaCarbonatite, Bulhoek
DS2001-0449
2001
Harmer, R.E.Harmer, R.E.A review of the geology of the dolomite dominated carbonatite complexes Of the Kalahari Craton.Journal of South African Earth Sciences, Vol. 32, No. 1, p. A 17 (abs)Southern AfricaCarbonatite, Spitskop, Bulhoek, Shawa
DS2002-0747
2002
Harmer, R.E.Ionov, D., Harmer, R.E.Trace element distribution in calcite dolomite carbonatites from Spitskop: inferences differentiationEarth and Planetary Science Letters, Vol.198,3-4,pp.495-510., Vol.198,3-4,pp.495-510.South AfricaCarbonatite magmas, Origin of carbonates in mantle xenoliths
DS2002-0748
2002
Harmer, R.E.Ionov, D., Harmer, R.E.Trace element distribution in calcite dolomite carbonatites from Spitskop: inferences differentiationEarth and Planetary Science Letters, Vol.198,3-4,pp.495-510., Vol.198,3-4,pp.495-510.South AfricaCarbonatite magmas, Origin of carbonates in mantle xenoliths
DS200512-0342
2003
Harmer, R.E.Gittins, J., Harmer, R.E.Myth and reality in the carbonatite silicate rock association.Periodico di Mineralogia, Vol. LXX11, 1. April, pp. 19-26.Field relations, geochronology
DS200512-0343
2005
Harmer, R.E.Gittins, J., Harmer, R.E., Barker, D.S.The bimodal composition of carbonatites: reality or misconception?Lithos, Advanced in press,Carbonatite, mineralogy
DS200612-0466
2005
Harmer, R.E.Gittins, J., Harmer, R.E., Barker, D.S.The bimodal composition of carbonatites: reality or misconception?Lithos, Vol. 85, 1-4, Nov-Dec. pp. 129-139.Carbonatite, genesis
DS200612-0527
2006
Harmer, R.E.Hanson, R.E., Harmer, R.E., Blenkinsop, T.G., Bullen, D.S., Dalziel, Gose, Hall, Kampunzu, Key, MukwakwamiMesoproterozoic intraplate magmatism in the Kalahari Craton: a review.Journal of African Earth Sciences, Vol. 46, 1-2, pp. 141-167.Africa, South AfricaMagmatism
DS201312-0328
2013
Harmer, R.E.Gose, W.A., Hanson, R.E., Harmer, R.E., Seidel, E.K.Reconnaissance paleomagnetic studies of Mesoproterozoic alkaline igneous complexes in the Kaapvaal craton, South Africa.Journal of African Earth Sciences, Vol. 85, pp. 22-30.Africa, South AfricaGeophysics - magnetics
DS201801-0021
2017
Harmer, R.E.Harmer, R.E.The Bulhoek carbonatite complex, South Africa: evidence for magmatic crystallization of dolomite at low pressures and the petogenetic implications.Carbonatite-alkaline rocks and associated mineral deposits , Dec. 8-11, abstract p. 5-7.Africa, South Africadeposit - Bulhoek

Abstract: In many plutonic carbonatite complexes the dominant carbonatite type is calcitic and there is a tendency to assume that dolomitic carbonatites are insignificant relative to calcitic types. While calcitic carbonatites dominate in regions of rifting, e.g. the East African Rift System, dolomitic carbonatites are more abundant in the Archaean Kaapvaal and Zimbabwean Cratons of southern Africa and the Archaean parts of the Canadian Shield (Harmer and Gittins, 1997). The ~1.4Ga Newania carbonatite, the only dolomite carbonatite complex described from India, is located within the Archaean Aravalli Craton (Ray et al., 2013). Increased exploration activity on carbonatites in response to the short-lived 2009-2012 REE boom has highlighted the importance of dolomitic carbonatites as targets for REE (and P) deposits: for example, of the 10 advanced African REE projects (i.e. deposits with a defined resource) associated with carbonatites, 7 are hosted within dolomite carbonatites (Harmer and Nex, 2016). This study reports a detailed petrological study of the Bulhoek Carbonatite Complex, one of a number of carbonatite and alkaline igneous complexes that were emplaced into the central Kaapvaal Craton at 1.4 Ma (Hanson et al., 2006). The Bulhoek Complex comprises three centres of intrusion of magnesian carbonatite into granitic and granophyric components of the 2.05Ga Bushveld Complex over a linear 20 km long zone. At all three centres, areas of fenitised granite enclose sheeted intrusions of dolomitic carbonatite of similar composition and intrusive style. No alkaline silicate magmatic rocks have been in the vicinity of the intrusive centres. Carbonatites were emplaced in three discrete intrusive episodes: initial intrusion was accompanied by significant shattering of the country rocks and produced a sequence of medium-grained, flow foliated dolomite carbonatites (C1) containing clasts of fenitised country rock granites along with xenoliths of fenitised ferrogabbro and magnetite transported from Bushveld Upper Zone cumulates underlying the granites. A second intrusive pulse produced cross-cutting sheets of medium- to coarse-grained dolomitic carbonatite free of xenoliths (C2) that make up the bulk of the carbonatite at each intrusive centre. Evidence that both C1 and C2 carbonatites intruded as crystal-rich mushes include strongly developed sub-vertical foliations, deflection of foliations around large fenite xenoliths and the common occurrence of folded foliations through drag effects at contacts with country rock and in C2 intrusions along contacts with C1 carbonatites.
DS201906-1282
2019
Harmon, N.Chambers, E.L., Harmon, N., Keir, D., Rychert, C.A.Using ambient noise to image the northern East African Rift.Geochemistry, Geophysics, Geosystems, Vol. 20, 4, pp. 2091-2109.Africageophysics

Abstract: In Ethiopia, the African Continent is rifting apart to slowly form a new ocean basin, which will expand the Red Sea and the Gulf of Aden. How and why this rifting is occurring remains an important unanswered question in earth science. We know tectonic forces are partly responsible, but magmatism also seems a key ingredient for breaking up Africa. Here we use seismic images obtained from signals pulled out of noise, to understand the crustal structure of the region; In particular, how and where magma is stored in the crust, and its relationship to the different stages of continental breakup visible in the region. We find evidence for long?term melt storage in places where rifting is just beginning in southern Ethiopia; whereas in regions where the crust is thinner due to extensive rifting, magma erupts more regularly. The long?term storage of magma in unrifted crust may help to heat and weaken it, allowing rifting to accelerate and propagate further south. We are also able to image regions with hydrothermal fluids in the shallow parts of the crust in inactive fault zones. These results provide insight into the breakup process and the role magma plays at different stages of rifting.
DS2002-0411
2002
Harmon, P.Dyke, A.L., Harmon, P., Mahanta, A.M.Falcon spreads its wings. Einstein and Newton... now new ones Galileo .. brief summary of performance and rationale behind BHP Billiton business.Preview, August pp. 25-28.Australia, Canada, United States, Mexico, Chile, Peru, South AfricaGeophysics - magnetics, Kimberlites
DS201112-0413
2011
Harmon, R.Harmon, R., Parker, A.Frontiers in geochemistry: contribution of geochemistry to the study of the Earth.Wiley Blackwell, Paperback 978-1-405-19337-5 $ 90.00GlobalBook - advertisement
DS1986-0430
1986
Harmon, R.S.Kempton, P.D., Moorbath, S., Harmon, R.S., Hoefs, J.Heterogeneous lower crust beneath southeast Arizona: evidence fromgranulitexenoliths, Geronimo volcanic fieldGeological Society of America, Vol. 18, No. 2, p. 124. (abstract.)Colorado Plateau, ArizonaMantle
DS1987-0620
1987
Harmon, R.S.Rogers, N.W., Hawkesworth, C.J., Mattey, D.P., Harmon, R.S.Sediment subduction and the source of potassium in orogenic leucititesGeology, Vol. 15, No. 5, May pp. 451-453GlobalLeucite, Ultrapotassic rocks
DS1987-0802
1987
Harmon, R.S.Woenrer, G., Harmon, R.S., Hoefs, J.Stable isotope relations in an open magma system, Laacher See, EifelContributions to Mineralogy and Petrology, Vol. 95, No. 3, pp. 343-349GermanyLeucitite
DS1989-0279
1989
Harmon, R.S.Collerson, K.D., MacDonald, R.A., Upton, B.G.J., Harmon, R.S.Composition and evolution of lower continental crust:evidence from xenoliths in Eocene lavas from the Bearpaw Mountains, MontanaNew Mexico Bureau of Mines Bulletin., Continental Magmatism Abstract Volume, Held, Bulletin. No. 131, p. 57. AbstractMontanaXenoliths
DS1990-0661
1990
Harmon, R.S.Harmon, R.S., Fowler, M.B.Oxygen isotope composition of the lower crustV.m. Goldschmidt Conference Held May 2-4, 1990, Program And Abstract, p. 51. Abstract onlyGlobalMantle, Geochronology
DS1990-0820
1990
Harmon, R.S.Kempton, P.D., Downes, H., Harmon, R.S.Evidence for lower crustal mixing zones in granulite xenoliths: examples from the French Massif Central and the southwest United States (US)Geological Society of America (GSA) Annual Meeting, Abstracts, Vol. 22, No. 7, p. A255ArizonaMantle, Xenoliths
DS1990-0821
1990
Harmon, R.S.Kempton, P.D., Harmon, R.S., Hawkesworth, C.J., Moorbath, S.Petrology and geochemistry of lower crustal granulites from the Geronimo volcanic field, southeastern ArizonaGeochimica et Cosmochimica Acta, Vol. 54, pp. 3401-3426ArizonaMantle, Geochemistry
DS1992-0669
1992
Harmon, R.S.Harmon, R.S., Rapela, C.W.Andean magmatism and its tectonic settingGeological Society of America (GSA) Special Paper, No. 265, 350pAndes, Chile, ArgentinaMagmatism, Tectonics
DS1992-1697
1992
Harmon, R.S.Worner, G., Moorbath, S., Harmon, R.S.Andean Cenozoic volcanic centers reflect basement isotopic domainsGeology, Vol. 20, No. 12, December pp. 1103-1106Andes, South America, Chile, BoliviaGeochronology, Volcanics
DS1993-1761
1993
Harmon, R.S.Woodhead, J.D., Greenwood, P., Harmon, R.S., Stoffers, P.Oxygen isotope evidence for recycled crust in the source of electromagnetic-type ocean island basaltsNature, Vol. 362, No. 6423, April 29, pp. 809-813GlobalGeochronology, Ocean island basalts
DS1994-0807
1994
Harmon, R.S.Ionov, D.A., Harmon, R.S., et al.Oxygen isotope composition of garnet and spinel peridotites in the continental mantle: evidence from the Vitim xenolith suite, southern Siberia.Geochimica et Cosmochimica Acta, Vol. 58, No. 5. pp. 1463-1470.Russia, SiberiaGeochronology, Vitim xenoliths
DS1994-1748
1994
Harmon, R.S.Taylor, R.N., Nesbitt, R.W., Vidal, F., Harmon, R.S., et al.Mineralogy, chemistry and genesis of the boninite series volcanics, Chichijima, Bonin Islands, Japan.Journal of Petrology, Vol. 35, No. 3, June pp. 577-618.JapanBoninites
DS1995-0015
1995
Harmon, R.S.Aitcheson, S.J., Harmon, R.S., et al.lead isotopes define basement domains of the Altiplano central AndesGeology, Vol. 23, No. 6, June pp. 555-558Peru, Chile, Argentina, AndesGeochronology, Altiplano -Puna Plateau
DS1995-0753
1995
Harmon, R.S.Harmon, R.S., Hoefs, J.Oxygen isotope heterogeneity of the mantle deduced from global Osystematics of basalts from different settingsContributions to Mineralogy and Petrology, Vol. 120, No. 1, pp. 95-114MantleGeochronology, Geotectonics
DS201706-1076
2017
Harmon, R.S.Harmon, R.S., Hark, R.R., Throckmorton, C.S., Rankey, E.C., Wise, M.A., Somers, A.M., Collins, L.M.Geochemical fingerprinting by handheld laser-induced breakdown spectroscopy. (LIBS)Geostandards and Geoanalytical Research, in press availableTechnologyspectroscopy

Abstract: A broad suite of geological materials were studied a using a handheld laser-induced breakdown spectroscopy (LIBS) instrument. Because LIBS is simultaneously sensitive to all elements, the full broadband emission spectrum recorded from a single laser shot provides a ‘chemical fingerprint’ of any material - solid, liquid or gas. The distinguishing chemical characteristics of the samples analysed were identified through principal component analysis (PCA), which demonstrates how this technique for statistical analysis can be used to identify spectral differences between similar sample types based on minor and trace constituents. Partial least squares discriminant analysis (PLSDA) was used to distinguish and classify the materials, with excellent discrimination achieved for all sample types. This study illustrates through four selected examples involving carbonate minerals and rocks, the oxide mineral pair columbite-tantalite, the silicate mineral garnet and native gold how portable, handheld LIBS analysers can be used as a tool for real-time chemical analysis under simulated field conditions for element or mineral identification plus such applications as stratigraphic correlation, provenance determination and natural resources exploration.
DS202106-0942
2021
Harmon, R.S.Harmon, R.S., Senesi, G.S.Laser-induced breakdown spectroscopy - a geochemical tool for the 21st century. * not specific to diamondsApplied Chemistry, Vol. 128, 104929 55p. PdfGlobalgeochemistry

Abstract: Laser-induced breakdown spectroscopy (LIBS) is a simple, straightforward, and versatile form of atomic emission spectroscopy that focuses a rapidly-pulsed laser beam onto a sample to form a plasma containing its constituent elements and then uses spectral analysis of the emitted light to detect the elements present. In theory, LIBS is capable of qualitative, semi-quantitative, and quantitative analysis of all elements in the periodic table. LIBS can be performed in the laboratory or outside in the ambient environment for on-site analysis in situ; LIBS can also be used for rapid microscale compositional imaging. This review first presents a description of the LIBS technique and then discusses and illustrates through a historic literature review how LIBS has been used to analyze gases, natural waters, minerals, rocks, sediments, and soils. Given the persistent need of analytical instrumentation for the rapid chemical analysis of geologic materials in the field, and the capability of LIBS to analyze any type of sample in real time with little to no preparation, there is a vast potential for the routine application of LIBS across a broad spectrum of the geosciences that is as yet only minimally realized.
DS201906-1300
2019
Harms, T.Harms, T., Baldwin, J.Paleoproterozoic metasupracrustal suites on the NW flank of the Wyoming province: the stories they do and do not tell about an evolving continent.GAC/MAC annual Meeting, 1p. Abstract p. 103.United States, Canadacraton

Abstract: Metasupracrustal sequences interlayered with quartzofeldspathic gneisses distinguish the Montana Metasedimentary terrane on the NW flank of the Wyoming Province (WP). Early thinking correlated marble-bearing suites and considered them younger than carbonate-absent sequences, promoting models of WP continental crust evolution toward thick lithosphere supporting a stable marine platform in the period ~ 3.5-2.5 Ga. Metasupracrustal suite depositional ages constrained by (1) detrital zircons; (2) times of metamorphism; and (3) cross-cutting meta-igneous rocks now indicate a more complex pattern of tectonic environments along the NW margin of the WP. Carbonate-bearing metasupracrustal suites in the Tobacco Root Mountains and Ruby Range include marble, amphibolite, orthoamphibolite, pelitic gneiss, quartzite, and iron formation. Detrital zircons constrain the protolith age to 2.45 Ga. Interlayered quartzofeldspathic gneiss with calc-alkaline geochemistry were previously interpreted as suggesting a continental fringing arc superimposed on Archean basement. An episode of metamorphism and anatexis followed at 2.45 Ga, demonstrated by metamorphic monazite and intrusive ages of cross-cutting mylonitic leucogneiss. We interpret this to be a time of collision along the NW WP. Cross-cutting mafic sills and dikes suggest continental rifting at 2.06 Ga. Diverse metasupracrustal suites whose protoliths must be 1.8 Ga occur in the Ruby, Tobacco Root, and Highland mountains. A carbonate-absent suite of amphibolite, orthoamphibolite, pelitic schist and quartzite in the Tobacco Root Mountains represents oceanic crust, while aluminous schist and interlayered amphibolite in the Highland Mountains are consistent with a back-arc basin setting. The Ruby Range suite includes prominent marble, amphibolite, orthoamphibolite, pelitic schist, quartzite and iron formation and may represent a second, post-rift carbonate platform facing that basin. These suites collapsed against the WP during the 1.78-1.72 Ga Big Sky orogeny as a consequence of subduction directed beneath the WP.
DS201212-0204
2012
HarnafiFlor De Lis, M., Stitch, Morales, Juli, Diaz, Cordoba, Pulgar, Ibarra, Harnafi, Gonzalez-LodeiroCrustal thickness variations in northern Morocco.Journal of Geophysical Research, Vol. 117, B2, B02312.Africa, MoroccoGeophysics - seismics
DS201412-0054
2014
Harnafi, M.Bezada, M.J., Humphreys, E.D., Davila, J.M., Carbonell, R., Harnafi, M., Palomeras, I., Levander, A.Piecewise delamination of Moroccan lithosphere from beneath the Atlas Mountains.Geochemistry, Geophysics, Geosystems: G3, Vol. 15, 4, pp. 975-985.Africa, MoroccoGeophysics
DS1950-0178
1954
Harner, R.S.Fryklund, V.C.Jr., Harner, R.S., Kaiser, E.P.Niobium (columbium) and Titanium at Magnet Cove and Potash Sulfur Springs, Arkansaw.United States Geological Survey (USGS) Bulletin., No. 1015B, PP. 23-56.United States, Gulf Coast, Arkansas, Hot Spring County, Garland CountyNiobium, Columbium, Titanium
DS1980-0160
1980
Harnish, A.Harnish, A.Arkansaw Finds a 5.5 Carat DiamondMurfreesboro Diamond., Oct. 30TH.United States, Gulf Coast, Arkansas, PennsylvaniaNews Item. Diamond Notable
DS1981-0202
1981
Harnish, A.Harnish, A.Gems from the Diamond Mine. #1Murfreesboro Diamond., Jan. 15TH.United States, Gulf Coast, Arkansas, PennsylvaniaNews Item. Production Statistics
DS1980-0161
1980
Harnish, H.Harnish, H.Gems from the Diamond Mine. #2Murfreesboro Diamond., Dec. 11TH. 2P.United States, Gulf Coast, Arkansas, PennsylvaniaProspecting News Item
DS1981-0203
1981
Harnish, H.Harnish, H.Gems from the Diamond Mine. #3Murfreesboro Diamond., APRIL 16TH. 1P.United States, Gulf Coast, Arkansas, PennsylvaniaProspecting News Item
DS1990-0662
1990
Harnois, L.Harnois, L., Mineau, R., Morency, M.Rare earth element geochemistry of alnoitic Cretaceous rocks and ultramafic xenoliths from Ile Bizard,Quebec CanadaChemical Geology, Vol. 85, No. 1/2 July 10, pp. 135-145QuebecAlnoite, rare earth elements (REE) Geochemistry
DS1991-0670
1991
Harnois, L.Harnois, L.TEA: a computer program in BASIC to calculate trace-element abundances in silicate rocks and magmas during melting and crystallization processesComputers and Geosciences, Vol. 17, No. 5, pp. 641-654GlobalComputer, Program -TEA silicates
DS1991-0671
1991
Harnois, L.Harnois, L., Mineau, R.Geochemistry of the Ile Cadieux monticellite alnoite, Quebec, CanadaCanadian Journal of Earth Sciences, Vol. 28, No. 7, July pp. 1050-1057QuebecAlnoite, Geochemistry
DS2002-0934
2002
Harnois, L.Lemieux, G., Harnois, L., Berclaz, A., Stevenson, R., SharmaCharacterisation petrochimique des dykes de lamprophyre et de carbonate region du Lac Aigneau.Quebec Ministere des Resources Naturelles, (FRE), GM 56659, 23p.QuebecPetrology
DS202007-1152
2020
Haro, M.Juarez-Perez, E., Haro, M.Perovskite cells take a step forward.Science, Vol 368, 6497, p. 1309.Globalperovskite

Abstract: Today's monocrystalline silicon solar cells have their throne on the roofs of our houses. In the past decade, however, perovskite solar cells (PSCs) show impressive advances with a high power conversion efficiency (PCE) of 25.2% (1) and low fabrication cost, which make this technology promising for further advances in decarbonization energy models (2). Yet the life cycle of PSCs needs to be increased for market integration. Poor stability is the main impediment to commercializing this technology. Thus, great effort has been focused on the causes and mechanisms of degradation, many of which can be mitigated or minimized with encapsulation. Various strategies have been proposed to increase PSCs' operational stability, which is affected by moisture, oxidation, heat, light, and other factors (3, 4). On page 1328 of this issue, Shi et al. (5) report a successful encapsulation procedure for hybrid PSCs.
DS201012-0782
2010
Haroldo da Silva Sa, J.Teixeira, J.B.G., Gloria da Silva, M., Misi, A., Cerqueira Pereira Cruz, S., Haroldo da Silva Sa, J.Geotectonic setting and metallogeny of the northern Sao Francisco Craton, Bahia, Brazil.Journal of South American Earth Sciences, Vol. 30, 2, pp. 71-83.South America, BrazilTectonics
DS200612-1443
2006
Harow, G.E.Tsujimori, T., Sisson, V.B., Liou, J.G., Harow, G.E., Sorensen, S.S.Very low temperature record of the subduction process: a review of worldwide lawsonite eclogites.Lithos, In press available,Canada, British Columbia, Guatemala, Australia, NorwaySubduction - cold, UHP metamorphism
DS1910-0351
1913
Harpending, A.Harpending, A., Wilkins, J.H.The Great Diamond Hoax and Other Stirring Incidents. in The life of A.h. Harpending.San Francisco: James H. Barry And Co., 283P.United States, California, West CoastKimberley
DS1950-0392
1958
Harpending, A.Harpending, A.The Great Diamond Hoax (1958)University OKLAHOMA PRESS, 211P.United StatesKimberlite, Kimberley, Janlib, History
DS1989-0591
1989
Harper, C.Harper, C., Drury, M.J. editors.Kimberlites in the Western Canadian Sedimentary BasinScientific Drilling, sedimentary basins, proceedings of a workshop Can., 1989, pp. 25-26Western Canada, United StatesNews item, Drilling/continental Program
DS1992-0767
1992
Harper, C.J.Jacobsen, S.B., Harper, C.J.Isotopic modeling of crust and mantle evolutionV.m. Goldschmidt Conference Program And Abstracts, Held May 8-10th. Reston, p. A 54. abstractMantleGeochronology, Crust
DS1996-0601
1996
Harper, C.L.Harper, C.L., Jacobsen, S.B.Evidence for 182 Hafnium in the Early Solar system and constraints on the time scale of terrestrial accretion and core formation.Geochimica Et Cosmochimica Acta, Vol. 60, No. 7, pp. 1131-53.MantleDensity - core
DS1992-0670
1992
Harper, C.L.Jr.Harper, C.L.Jr., Jacobsen, S.B.Evidence from coupled 147 Sm-143 neodymium and 146 Sm-142 neodymium systematics for very early (4.5-Gyr) differentiation of the earth's mantleNature, Vol. 360, No. 6406, December 24/31, pp. 728-732GlobalGeochronology, Mantle
DS1990-0552
1990
Harper, C.T.Gent, M.R., Harper, C.T., Guliov, P., Macdonald, R.Saskatchewan diamonds: a new realityThe Canadian Mining and Metallurgical Bulletin (CIM Bulletin), Vol. 83, No. 939, July p. 115. Abstract (PDA)SaskatchewanBrief overview, Diamond activities
DS200512-0402
2005
Harper, C.T.Harper, C.T., Van Breeman, O., Wodick,N., Pehrsson, S., Heaman, L., Hartlaub, R.The Paleoproterozoic lithostructural history and thermotectonic reactivation of the Archean basement in southern Hearne domain of northeastern Saskatchewan.GAC Annual Meeting Halifax May 15-19, Abstract 1p.Canada, SaskatchewanTrans Hudson orogen
DS201610-1868
2016
Harper, D.R.Harper, D.R., Deangelis, M.T.Examination of mica bearing rocks from the Magnet Cove alkaline intrusive complex, Arkansas.GSA Annual Meeting, 1/2p. abstractUnited States, ArkansasIjolite, carbonatite

Abstract: The Magnet Cove Alkaline Intrusive Complex contains several silica-undersaturated igneous rock types (e.g. nepheline syenite, ijolite, carbonatite) that form a concentric ring map pattern approximately 4.6 square miles in area. These rings, which are likely the result of several nearly contemporaneous magma injection events during the mid Cretaceous, become increasingly silica-undersaturated from rim to core, and have been previously mapped as separate geologic units. The outer ring contains nepheline syenite, the intermediate ring contains both garnet ijolite and garnet biotite ijolite, and the core contains carbonatite. Though the detailed modal mineralogy differs somewhat between the silicate (i.e. syenite and ijolite) rock types, they all have in common the presence of mica group minerals. The purpose of this study is to examine and characterize the diversity of mica group minerals found in the silica-undersaturated rocks of Magnet Cove. Syenite and ijolite rock samples were collected from several locations within the complex, and thin sections were prepared for petrographic and electron microscope analysis using facilities and equipment at the UALR Rock Preparation Laboratory. Overall mineralogy from these samples indicates the presence of potassium feldspar, plagioclase feldspar, several feldspathoid minerals (nepheline, sodalite, altered leucite), amphiboles, pyroxenes (primarily aegerine and aegerine-augite), black Ti-bearing garnets (melanite, schorlomite), and various opaque minerals (e.g. magnetite, pyrite). Previously, micas in these rocks have been labeled simply as “biotite”. However, the ranges of color (yellowish-brown to bluish-green), crystal size (millimeter to several centimeters in diameter), and crystal habit (clusters of euhedral grains) in hand sample and variable pleochroism, ranging interference colors, reaction coronas, and zoning in thin section indicate a more interesting and complex chemical history.
DS1982-0068
1982
Harper, F.J.Apter, D.B., Harper, F.J., Wyatt, B.A.The Geology of the Mayeng Kimberlite SillsProceedings of Third International Kimberlite Conference, TERRA COGNITA, ABSTRACT VOLUME., Vol. 2, No. 3, P. 204, (abstract.).South AfricaKimberlite, Mineralogy, Cape Province, Chemistry
DS1984-0112
1984
Harper, F.J.Apter, D.B., Harper, F.J., Wyatt, B.A., Smith, B.H.S.The Geology of the Mayeng Kimberlite Sill Complex, South Africa.Proceedings of Third International Kimberlite Conference, Vol. 1, PP. 43-58.South AfricaMineral Chemistry, Mineralogy, Ventersdorp Lavas, Petrography
DS1998-0584
1998
Harper, G.Harper, G., Andrew, A.J., Fenoulhet, B.Worldwide exploration trends- where is the next exploration romance?Engineering and Mining Journal, Vol. 199, No. 7, July pp. 40-45GlobalEconomics, success, discoveries, Reserves, expenditures
DS1996-0602
1996
Harper, K.M.Harper, K.M., Chamberlain, K.R.New uranium-lead (U-Pb) age constraints on the timing and duration of Ca 1.78 GA collisional Orogeny in southern Wyoming.Geological Society of America, Abstracts, Vol. 28, No. 7, p. A-314.WyomingTectonics, Geochronology
DS1920-0074
1921
Harper, L.F.Harper, L.F.Alluvial Gold, Diamonds and Gemstones, Crookwell DistrictNew South Wales Geological Survey Report For 1921, P. 62.Australia, New South WalesDiamond
DS1992-1091
1992
Harper, R.M.Morley, C.K., Cunningham, S.M., Harper, R.M., Wescott, W.A.Geology and geophysics of the Rukwa Rift, East AfricaTectonics, Vol. 11, No. 1, February pp. 69-East AfricaTectonics, Rukwa Rift
DS1994-0714
1994
Harper, S.Harper, S.Characteristics and origin of calcite apatite biotite carbonatite veins In the Grenville Province, MarmouthUniversity of of Toronto, MSc. thesisOntarioCarbonatite, Carbonatite veins, Thesis, Deposit -Marmouth Township area
DS1860-0135
1871
Harper's MagazineHarper's MagazineA Chapter on GemsHarpers Magazine., Vol. 42, Jan. PP. 223-225.United States, North CarolinaGemology
DS1986-0340
1986
Harpoth, O.Harpoth, O.The mineral occurrences of central east GreenlandScientific Research in Greenland, Copenhagen, 138pGreenlandBook - review, Mineral occurrences
DS1998-1576
1998
Harrap, R.White, D., Helmstaedt, H., Harrap, R., Thurston, P.The origin of our continent: LITHOPROBE seismic investigations in The western Superior TransectThe Canadian Mining and Metallurgical Bulletin (CIM Bulletin), Vol. 90, No. 1017, Feb. pp. 78-82OntarioLithoprobe, Plate tectonics
DS1998-0607
1998
Harrap, R.M.Helmstaedt, H.H., Harrap, R.M.Tectonic aspects of the kimberlite diamond upper mantle sample connection:does a coherent model evolve?7th International Kimberlite Conference Abstract, pp. 331-5.Ontario, Manitoba, Northwest TerritoriesCraton, subduction, Petrology, Lithoprobe, geophysics - seismics, SNORCLE.
DS2003-1473
2003
Harrap, R.M.White, D.J., Musacchio, G., Helmstaedt, H.H., Harrap, R.M., Thurston, P.C.Images of lower crustal oceanic slab: direct evidence for tectonic accretion in theGeology, Vol. 31, 11, pp. 997-1000.OntarioSubduction - not specific to diamonds
DS200412-2109
2003
Harrap, R.M.White, D.J., Musacchio, G., Helmstaedt, H.H., Harrap, R.M., Thurston, P.C., Van der Velden, A., Hall, K.Images of lower crustal oceanic slab: direct evidence for tectonic accretion in the Archean western Superior Province.Geology, Vol. 31, 11, pp. 997-1000.Canada, OntarioSubduction - not specific to diamonds
DS1998-0585
1998
Harrap. R.M.Harrap. R.M., helmstaedt, H.H.Reasoning across deep time: formal reasoning examination of Archeantectonics.Geological Society of America (GSA) Annual Meeting, abstract. only, p.A396.GlobalTectonics, Crustal assembly
DS1991-0672
1991
Harrell, M.D.Harrell, M.D., Dyar, M.D., McGuire, A.V.Redox behaviour of metasomatism in a composite xenolithGeological Society of America Annual Meeting Abstract Volume, Vol. 23, No. 5, San Diego, p. A 272New MexicoXenoliths, Spectroscopy, Kilbourne Hole
DS1994-0715
1994
Harrelson, D.W.Harrelson, D.W.Alkalic igneous rock suites: a comparison of the Jackson Dome and Magnet Cove carbonatite complex.Geological Society of America Abstracts, Vol. 26, No. 1, February p. 8. AbstractArkansasAlkaline rocks, Carbonatite
DS1985-0266
1985
Harren, P.H.Harren, P.H.The Magma Ocean Concept and Lunar Evolution ( Review)Annual Review Earth Science., Vol. 13, PP. 201-240.GlobalBlank
DS1991-0673
1991
Harries, .E.Harries, .E.Earthwatch, the climate from spacePrentice Hall, 216p. $ 32.00GlobalBook -ad, Earthwatch -climate
DS1992-0671
1992
Harries, K.C.Harries, K.C.More straight talk on royalties #1Pda Digest Winter 1991-1992, pp. 16-17CanadaEconomics, ore reserves, Royalties
DS1989-0592
1989
Harries, K.J.Harries, K.J.Areas of interest... joint venture agreementsNorthern Mining Magazine, Vol. 4, No. 11, November p. 16GlobalLaw, Joint ventures
DS1992-0672
1992
Harries, K.J.Harries, K.J.More straight talk on royalties #2Prospectors and Developers Association of Canada (PDAC) Digest, Winter 1991-1992, pp. 16-17CanadaEconomics, Tax royalties
DS1994-0716
1994
Harries, K.J.Harries, K.J.Mineral exploration agreementsCentre for Resource Studies, 342p. $ 42.80CanadaBook -ad, Legal, mining, agreements, joint ventures
DS1997-0478
1997
Harries, K.J.Harries, K.J.Entry and work on private propertyHewson and White Publ, approx. $60.00 United StatesCanadaBook - table of contents, Legal, agreements, option, considerations, surface
DS1990-0663
1990
Harries, K.J.C.Harries, K.J.C.Articles on legalities -concerning the mining industryReprinted from Northern Miner Magazine, Reprint volume 54pCanadaLaw, Agreements, JV, titles
DS1994-0717
1994
Harries, K.J.C.Harries, K.J.C.Mining exploration agreements -a guide to their negotiation and useCentre for Resource Studies, 310pCanada, GlobalTable of contents, Legal - Mining exploration agreements
DS1996-0603
1996
Harries, K.J.C.Harries, K.J.C.Mining royalties between private parties: a guide by exampleCentre for Resource Studies, 470p. $ 70.00CanadaBook -ad, Mining royalties
DS1998-0586
1998
Harries, K.J.C.Harries, K.J.C.The dilemma of the mining royalty: contractual or realty interestNatural Res. forum, Vol. 22, No. 1, Feb. pp. 1-14GlobalEconomics - royalty, Mining - legal
DS2003-0555
2003
Harries, K.J.C.Harries, K.J.C.Overview of mining agreements and royalties. IN: Mining agreements: deal makersMinerals Economics Society 13th. Symposium, Toronto, January 20, 10p.GlobalMining agreements - legal
DS2003-0556
2003
Harries, K.J.C.Harries, K.J.C.Mining royalty agreements. IN: Mining agreements: deal makers and deal breakersMinerals Economics Society 13th. Symposium, Toronto, January 20, 15p.GlobalMining agreements - legal
DS200412-0794
2003
Harries, K.J.C.Harries, K.J.C.Mineral agreements and royalties.Canadian Institute of Mining and Metallurgy Bulletin, Special Volume, 55, $ 145.00 lfoley @cim.orgGlobalLegal, economics, JV Book
DS1970-0922
1974
Harrington, H.J.Harrington, H.J., et al.Regional Geology of Victoria in Relation to Satellite ImagerVictoria Department of Mines Report Inv., No. 106.AustraliaKimberlite
DS1991-0674
1991
Harrington, S.E.Harrington, S.E.Use of Land sat Thematic Mapper dat a in exploration for ultramafic bodies in northwest OntarioProceedings of the Eighth Thematic Conference on Geologic Remote, Vol. II, pp. 1123-1124. -extended abstractOntarioRemote sensing, Ultramafic
DS1990-0441
1990
HarrisEldridge, C.S., Compston, W., Williams, I.S., Bristow, J., HarrisCrustal recycling as recorded in sulfide inclusions from diamonds: a SHRIMP sulfur and lead isotopic studyGeological Society of America (GSA) Annual Meeting, Abstracts, Vol. 22, No. 7, p. A26Southern AfricaDiamond inclusions, SHRIMP geochronology
DS1991-0284
1991
HarrisCompston, W., Williams, I.S., Kinny, P.D., Bristow, J.W., HarrisA SHRIMP ion microprobe investigation into the timing, sources and processes involved in diamond formationGeological Society of America Annual Meeting Abstract Volume, Vol. 23, No. 5, San Diego, p. A 102South AfricaMicroprobe, Diamond morphology
DS1998-0187
1998
HarrisBurgess, R., Johnson, L.H., Mattey, D., Harris, TurnerHelium, Argon, and Carbon isotopes in coated and polycrystalline diamonds.Chemical Geology, Vol. 146, No. 3-4, May 5, pp. 205-218.AustraliaGeochronology, Diamond morphology
DS1998-0250
1998
HarrisChinn, I.L., McCallum, M.E., Harris, Milledge, GurneyCO2 bearing diamonds in eclogite xenoliths from the Sloan 2 kimberlite, Colorado.7th International Kimberlite Conference Abstract, p. 155.Colorado, WyomingEclogite xenoliths, Deposit - Sloan 2
DS2001-0975
2001
HarrisRichardson, S.H., Shirey, Harris, CarlsonThe life and times of multiple generations of diamonds from the Kaapvaal Craton keel.Slave-Kaapvaal Workshop, Sept. Ottawa, 2p. abstractSouth AfricaDiamond - genesis, Diamond - inclusions
DS2001-1069
2001
HarrisShirey, S.B., Harris, James, Deines, Richardson, et al.Geochemical and geophysical perspectives on diamond formation beneath southern Africa.Slave-Kaapvaal Workshop, Sept. Ottawa, 3p. abstractSouth AfricaGeochemistry - diamond inclusions, Diamond - genesis
DS2001-1238
2001
HarrisWilkinson, L., Kjarsgaard, B., Le Cheminant, A., HarrisDiabase dyke swarms in the Lac de Gras area, and their significance to kimberlite exploration: initial resultsGeological Survey of Canada Current Research, C8, 24p.Northwest TerritoriesProterozoic dike, tectonics, emplacement, age, patterns, Geochemistry
DS2002-0084
2002
HarrisAulbach, S., Stachel, T., Vijoen, K., Brey, G., HarrisEclogitic and websteritic diamond sources beneath the Limpopo Belt - is slab melting the link?Contribution to Mineralogy and Petrology, Vol.143, 1, Feb.pp.56-70.South AfricaDiamond - inclusions, mineralogy, Secondary Ion Mass Spectrometry, Deposit - Venetia
DS2002-0572
2002
HarrisGillet, P., Sautter, V., Harris, Reynard, Harte, KunzRaman spectroscopic study of garnet inclusions in diamonds from the mantle transition zone.American Mineralogist, Vol.87, 2-3, pp. 312-17.BrazilSpectroscopy - majoritic content, Deposit - Sao Luiz
DS200512-0113
2005
HarrisBrenker, F.E., Vincze, L., Velemans, Nasdala, Stachel, Vollmer, Kersten, Somogyi, Adams, Joswig, HarrisDetection of a Ca rich lithology in the Earth's deep ( >300km) convecting mantle.Earth and Planetary Science Letters, Vol. 236, 3-4, pp. 579-587.Africa, GuineaKankan, diamond inclusions, spectroscopy
DS200812-0786
2008
HarrisNasdala, L., Gigler, Wildner, Grambole, Zaitsev, Harris, Hofmeister, Milledge, SatitkuneAlpha radiation damage in diamond.Goldschmidt Conference 2008, Abstract p.A672.TechnologyDiamond morphology
DS201012-0024
2009
HarrisAulbach, S., Stachel, T., Craeser, R.A., Heaman, L.M., Shirey, S.B., MUehlenbachs, K., Eichenberg, D., HarrisSulphide survival and diamond genesis during formation and evolution of Archean subcontinental lithosphere: a comparison between the Slave and Kaapvaal cratons.Lithos, Vol. 112 S pp. 747-757.Canada, AfricaGeochronology
DS1997-0504
1997
Harris, A.Higgin, J., Harris, A.VAST: a program to locate and analyze volcanic thermal anomalies automatically from remotely sensed dataComputers and Geosciences, Vol. 23, No. 6, pp. 627-46GlobalVolcanics, Computers - VAST.
DS200512-0403
2005
Harris, A.Harris, A., Kincaid, C.The many potential faces of bouyant mantle upwellings: diversity within the plume family.Chapman Conference held in Scotland August 28-Sept. 1 2005, 1p. abstractMantleMantle plume, geothermometry
DS200812-0560
2008
Harris, A.J.L.Kervyn, M., Ernst, G.G., Harris, A.J.L., Belton, F., Mbede, E., Jacobs, P.Thermal remote sensing of the low intensity carbonatite volcanism of Oldoinyo Lengai, Tanzania,International Journal of Remote Sensing, Vol. 29, 22, pp. 6467-6499.Africa, TanzaniaCarbonatite
DS1950-0275
1956
Harris, A.T.Harris, A.T.Stones of FireNew York: Pageant Press., 353P.South Africa, Vaal RiverKimberley
DS2002-0262
2002
Harris, B.Casselman, S., Harris, B.Yukon diamond rumour map and notesAurora Geosciences Ltd., 10p.YukonNews item, Mountain Diatreme, Shulin Lake. Xeno property
DS2003-0175
2003
Harris, B.A.Buchan, K.L., Harris, B.A., Ernst, R.E., Hanes, J.A.Ar Ar dating of the Pickle Crow diabase dyke system in the western Superior CratonGeological Association of Canada Annual Meeting, Abstract onlyManitobaGeochronology
DS200412-0233
2003
Harris, B.A.Buchan, K.L., Harris, B.A., Ernst, R.E., Hanes, J.A.Ar Ar dating of the Pickle Crow diabase dyke system in the western Superior Craton of the Canadian Shield of Ontario and implicaGeological Association of Canada Annual Meeting, Abstract onlyCanada, ManitobaGeochronology
DS1985-0267
1985
Harris, C.Harris, C.Magma and Fluid Evolution in the Volcanic Rocks of Ascension Island.Conference Report On The Meeting of The Volcanic Studies Gro, 1P. ABSTRACT.GlobalHawaiite, Comendite
DS1992-0673
1992
Harris, C.Harris, C., Erlank, A.J.The production of large volume low O18 O rhyolites during the rifting of Africa and Antarctica: the Lebombo Monocline, southern AfricaGeochimica et Cosmochimica Acta, Vol. 56, No. 9, pp. 3561-3570Southern AfricaRhyolites, Rifting
DS1995-0754
1995
Harris, C.Harris, C.The oxygen isotope geochemistry of the Karoo and Etendeka volcanic field of southern Africa.South. African Journal of Geology, Vol. 98, No. 2, June pp. 126-139.South Africa, BotswanaGeochemistry -volcanics, Karoo - not specific to diamonds
DS1995-0755
1995
Harris, C.Harris, C.The oxygen isotope geochemistry of the Karroo and Etendeka volcanic provinces of southern AfricaSouth African Journal of Geology, Vol. 98, No. 2, June pp. 126-139South Africa, BotswanaGeochemistry, Volcanics
DS1999-0289
1999
Harris, C.Harris, C., Marsh, J.S., Milner, S.C.Petrology of the alkaline core of the Messum igneous complex, : evidence or the progressively decreasing ...Journal of Petrology, Vol. 40, No. 9, Sept. pp. 1377-98.NamibiaCrustal contamination, Alkaline rocks
DS2000-0145
2000
Harris, C.Cawthorn, R.G., Harris, C., Kruger, F.J.Discordant ultramafic pegmatoidal pipes in the Bushveld ComplexContributions to Mineralogy and Petrology, Vol. 140, No. 1, pp.119-39.South AfricaUltramafic - pipes, Bushveld Complex
DS200512-0404
2005
Harris, C.Harris, C., Murton, J.B.Cryospheric systems: glaciers and permafrost.Geological Society of London, SP 242, 168p.Europe, Greenland, IcelandBook - geomorphology, glacial tectonic
DS201312-0513
2013
Harris, C.Kramers, J.D., Andreoli, M.A.G., Atanasova, M., Belyanin, G.A., Block, D.L., Franklyn, C., Harris, C., Lekgoathi, M., Montross, C.S., Ntsoane, T., Pischedda, V., Segonyane, P., Viljoen, K.S., Westraadt, J.E.Unique chemistry of a diamond bearing pebble from the Libyan desert glass strewnfield, SW Egypt: evidence for a shocked comet fragment.Earth and Planetary Science Letters, Vol.382, pp. 21-31.Africa, EgyptShock diamonds
DS201412-0341
2014
Harris, C.Harris, C., Hlongwane, W., Gule, N., Scheepers, R.Origin of tanzanite and associated gemstone mineralization at Merlani, Tanzania.Journal of South African Geology, Vol. 117, 1, June pp. 15-30.Africa, TanzaniaTanzanite
DS201510-1794
2015
Harris, C.Ogungbuyi, P.I., Janney, P.E., Harris, C.The petrogenesis and geochemistry of the Zandkopsdrift carbonatite complex, Namaqualand, South Africa.GSA Annual Meeting, Paper 131-14, 1p. Abstract onlyAfrica, South AfricaCarbonatite

Abstract: Petrologic and geochemical data for carbonatites and associated alkaline igneous rocks are presented for the Zandkopsdrift Carbonatite Complex, Namaqualand. The samples included in this study are relatively fresh, collected by coring at depths of >70 m below the weathered cap zone. The Zandkopsdrift complex is the only locality in the province known to contain significant carbonatite. The carbonatites studied are calico-, ferro- and silico- carbonatites, based on mineralogy, texture, and major element composition. They have low to moderate Mg-numbers (35-65), variable MgO contents (1.2-8.50 wt.%) and high atomic Ca/Ca+Mg (0.73-0.97), indicating that they are not likely simple mantle melts. The carbonatites contain significant apatite, magnetite, pyrochlore and phlogopite. Zandkopsdrift also contains significant amounts of aillikite and olivine melilitite. These rocks have relatively low SiO2 (25-31 wt.%) and Al2O3 (5.3- 6.1 wt.%), high K2O (6-6.3 wt.%) and TiO2 (5.6-9.5 wt.%) and moderate Mg numbers (51-58). ?18O and ?13C isotopes were measured for carbonatites and aillikites. ?13CPDB values are close to those expected for mantle-derived carbonatites (-3.9 to -8.83), while the ?18OSMOW values are significantly higher (+13. 25 to 21.84‰). The high ?18O value observed in carbonatites and aillikites is most likely attributable to secondary alteration by hydrous/hydrothermal fluids. This supports the inference that the Zandkopsdrift carbonatite is magmatic in origin but was later affected by secondary alteration which resulted in the elevated O stable isotopes. The ‘mantle-like’ ?13C is inconsistent with significant assimilation of C-bearing crustal rocks. Chondrite-normalised REE contents in the carbonatites are 2400 to 10,600 for La and 36 to 170 for Lu. The high REE contents of the carbonatites are most likely due to a combination of a source metasomatised by a highly LREE-enriched agent, as well as significant magmatic differentiation. The relatively fractionated composition of the Zandkopsdrift aillikites and melilitites is also consistent with this hypothesis. We propose that the Zandkopsdrift carbonatites were most likely formed by either immiscible liquid separation from or fractional crystallization of a moderately fractionated, carbonate-rich silicate parental magma. Session No. 131--Booth# 338
DS201611-2141
2016
Harris, C.Smart, K., Tappe, S., Simonetti, A., Harris, C.Tectonic significance and redox state of Paleoproterozoic eclogite and pyroxenite components in the Slave cratonic mantle lithosphere, Voyageur kimberlite, Arctic Canada.Chemical Geology, in press available 22p.Canada, NunavutDeposit - Voyageur
DS201707-1369
2017
Harris, C.Smart, K.A., Tappe, S., Simonetti, A., Simonetti, S.S., Woodland, A.B., Harris, C.Tectonic significance and redox state of Paleoproterozoic eclogite and pyroxenite components in the Slave cratonic mantle lithosphere, Voyager kimberlite, Arctic Canada.Chemical Geology, Vol. 455, pp. 98-119.Canadadeposit - Voyager

Abstract: Mantle-derived eclogite and pyroxenite xenoliths from the Jurassic Voyageur kimberlite on the northern Slave craton in Arctic Canada were studied for garnet and clinopyroxene major and trace element compositions, clinopyroxene Pb and garnet O isotopic compositions, and garnet Fe3 +/?Fe contents. The Voyageur xenoliths record a wide range of pressures, but are cooler compared to mantle xenoliths derived from the nearby, coeval Jericho kimberlite. The CaO, TiO2 and Zr contents of Voyageur eclogites increase with depth, which is also observed in northern Slave peridotite xenoliths, demonstrating ‘bottom-up’ metasomatic processes within cratonic mantle lithosphere. The Voyageur eclogites have positive Eu anomalies, flat HREEN patterns, and major element compositions that are consistent with ultimate origins from basaltic and gabbroic protoliths within oceanic lithosphere. Clinopyroxene Pb isotope ratios intercept the Stacey-Kramers two-stage terrestrial Pb evolution curve at ca. 2.1 Ga, and form an array towards the host kimberlite, indicating isotopic mixing. The 2.1 Ga eclogite formation age broadly overlaps with known Paleoproterozoic subduction and collision events that occurred along the western margin of the Slave craton. Unlike the eclogites, the Voyageur pyroxenites contain garnet with distinctive fractionated HREEN, sinusoidal REE patterns of calculated bulk rocks, and clinopyroxene with 206Pb/204Pb ratios that intercept the Stacey-Kramers curve at 1.8 Ga. This suggests a distinct origin as Paleoproterozoic high-pressure mantle cumulates. However, the pyroxenite Pb isotope ratios fall within the eclogite array and could also be explained by protoliths formation at ca. 2.1 Ga followed by minor isotopic mixing during mantle metasomatism. Thus, an alternative scenario involves pyroxenite formation within the mantle section of Paleoproterozoic oceanic lithosphere followed by variable metasomatism after incorporation into cratonic mantle lithosphere. This model allows for a linked petrogenesis of the Voyageur eclogites (crust) and pyroxenites (mantle) as part of the same subducting oceanic slab. Oxygen fugacity determinations for one pyroxenite and ten eclogite xenoliths show a range of 3 log units, from ? 4.6 to ? 1.6 ?FMQ, similar to the range observed for nearby Jericho and Muskox eclogites (?FMQ ? 4.2 to ? 1.5). Importantly, the northern Slave eclogite and pyroxenite mantle components are highly heterogeneous in terms of redox state provided that they range from reduced to oxidized relative to Slave peridotite xenoliths. Moreover, the Voyageur eclogites do not exhibit any trend between oxidation state and equilibration depth, which contrasts with the downward decrease in fO2 shown by Slave and worldwide cratonic peridotite xenoliths. Our investigation of mantle eclogite and pyroxenite fO2 reinforces the important influence of recycled mafic components in upper mantle processes, because their high and variable redox buffering capacity strongly controls volatile speciation and melting relations under upper mantle conditions.
DS201709-2039
2017
Harris, C.Ogungbuyi, P.I., Janney, P.E., Harris, C.The geochemistry and genesis of Marinkas Quellen carbonatite complex, southwestern Namibia.Goldschmidt Conference, abstract 1p.Africa, Namibiacarbonatite

Abstract: The 525 Ma Marinkas Quellen (MQ) Complex of southern Namibia, part of the Kuboos-Bremen Line (KBL) of alkaline igneous centers [1] consists of granites, nepheline syenites and carbonatites and is the only carbonatite locality in the KBL [1]. MQ carbonatite variteties include calciocarbonatites, magnesiocarbonatites and ferrocarbonatites. The enrichments in Ba, Nb and the REE vary widely in the carbonatites, with La ranging from 45 to 11154 ppm. All the carbonatites are characterised by large Zr, Hf, Ti depletions. Zr/Hf ratios ranges from 40 to 500, all greater than the chondritic value of 36. Such large Zr/Hf fractionations are often associated with carbonatite metasomatism. The values of carbon and oxygen isotope ratios of bulk carbonate in Marinkas Quellen carbonatites vary significantly (e.g., ?13C = -3.95 to -6.02‰; ?18 O = 8.84 to 22.22‰). The carbon isotope compositions are in the mantle range, while the oxygen isotope values extend to higher than typical mantle values, presumably due to interaction with hydrous fluids. All but two of the carbonatite samples have initial 87Sr/86Sr ratios falling in the range of 0.70236 to 0.70408. Of the remaining samples, one, a ferrocarbonatite, has a higher value of 0.70503 that is likely due to contamination by the surrounding rock or assimilation in the lower crust or Sr exchange with groundwater. The other, a magnesiocarbonatite, appears to have experienced an increase in its Rb/Sr ratio due to alteration, resulting in an over-corrected initial 87Sr/86Sr value. The relatively low Sr isotope ratios of most samples, plus their HNd(t) values (+3.9 to +4.8) values suggest that the carbonatite magma was generated from a long-lived low Rb/Sr, high Sm/Nd, relatively depleted mantle source. The radiogenic Pb isotope composition of the carbonatites (206Pb/204Pbi ratios from 18.06 to 22.38), suggests a high U/Pb source, akin to the HIMU mantle end member. This points to a sub-lithospheric (asthenospheric) source with only a relatively minor contribution from enriched lithospheric mantle
DS201709-2046
2017
Harris, C.Radu, I.B., Harris, C., Moine, B., Costin, G., Cottin, J-Y.Subduction relics in the cratonic root - evidence from delta O18O variations in eclogite xenoliths.Goldschmidt Conference, abstract 1p.Africa, South Africadeposit, Roberts Victor, Jagersfontein
DS201709-2054
2017
Harris, C.Smart, K., Tappe, S., Simonetti, A., Simonetti, S., Woodland, A., Harris, C.The redox state of mantle eclogites.Goldschmidt Conference, abstract 1p.Mantleeclogites

Abstract: Mantle-derived eclogite xenoliths are key for studying the evolution of the cratonic lithosphere, because geochemical evidence suggests that they typically represent fragments of Archean and Proterozoic oceanic lithosphere [1]. Recently, it has been suggested that eclogite xenoliths can serve as redox sensors of the Precambrian upper mantle using V/Sc as a redox proxy [2]. However, metasomatism can change the original oxidation state of the cratonic mantle [3], thereby limiting its use for monitoring mantle redox evolution. Circa 1.8–2.2 Ga eclogite xenoliths erupted with Jurassic kimberlites of the northern Slave craton have geochemical features that indicate oceanic crust protoliths [4, 5]. Such Paleoproterozoic ages are common for Slave craton mantle eclogites [6], linking eclogite formation with 1.9 Ga subduction-collision events at the western craton margin. The eclogites studied here have highly variable Fe3+/?Fe (0.019 – 0.076 ±0.01), with logfO2 (?FMQ-4 to +2 ±0.5) that are both relatively oxidized and reduced compared to Slave mantle peridotite xenoliths [3]. Also, eclogite fO2 positively correlates with some indicies of metasomatism, such as elevated TiO2 in garnet. In addition to considering the time gap between eclogite formation and kimberlite eruption, the highly variable fO2–depth systematics of the eclogites studied here illustrate the drawbacks of using averaged eclogite fO2 to define the redox evolution of the upper mantle. Despite this, the ca. 2 Ga northern Slave craton eclogites have an average depth-corrected logfO2 of ?FMQ-0.5±1.3 (1?) that overlaps with modern MORB, and complies with the upper mantle redox evolution trend predicted using V/Sc ratios of mantlederived melts [2]. However, given the debate around the secuarity of mantle redox [7], further research into the suitability of mantle eclogites as redox sensors is warranted.
DS201710-2234
2017
Harris, C.Howarth, G.H., Harris, C.Discriminating between pyroxenite and peridotite sources for continental flood basalts ( CFB) in southern Africa using olivine chemistry.Earth and Planetary Science Letters, Vol. 475, pp. 143-151.Africaperidotites

Abstract: Continental Flood Basalts (CFB) result from voluminous outpourings of magma that often precede continental break-up. Notwithstanding the petrogenetic importance of CFBs, the nature of the mantle source for such magmas is contentious, particularly with regard to picrites with Ni-rich olivine phenocrysts. Previous studies have suggested that Ni-rich olivines associated with plume volcanism in regions of thickened (>90 km) lithosphere are related to either source mineralogy differences (peridotite versus pyroxenite) or change in olivine-melt partitioning due to pressure increase. In order to evaluate these two hypotheses, we present trace element data for olivines from the Karoo CFB Tuli and Mwenezi picrites and the Etendeka CFB Horingbaai/LTZ-L type picrites, all of which erupted in regions of thickened (>90 km) lithosphere in southern Africa. Karoo picrite olivines are Ni-rich, Ca- and Mn-poor, and have low (<1.4) 100*Mn/Fe. These compositions are consistent with a pyroxenitic source. Etendeka Horingbaai/LTZ-L picrite olivines do not show Ni-enrichment, but are characterized by high Al and Cr, and high (>1.4) 100*Mn/Fe, which is more consistent with high temperature melting of a dominantly peridotitic source. We also show that the Karoo and Etendeka olivines are characterized by distinct Mn/Zn ratios of <13 and >15, respectively.In addition, bulk rock geochemical data compilations and previously reported olivine for Karoo and Etendeka CFBs are discussed in order to further constrain source components based on previously described pyroxenite melt geochemical indices such as MgO-CaO systematics, FeO/MnO, Zn/Fe, and FC3MS (FeO/CaO-3*MgO/SiO2). These geochemical indices suggest a pyroxenite-dominated source for Karoo CFBs as well as for Etendeka ferropicrites whereas a peridotite-dominated source is indicated for Etendeka Horingbaai/LTZ-L type picrites analyzed in this study. Based on our data, Ni-enrichment of olivine in plume-related magmas in regions of thickened lithosphere in southern Africa is not ubiquitous. We therefore suggest that mineralogical variation of the source is a more likely major control of olivine chemistry and parent melt variations for Karoo and Etendeka CFBs. We also show that olivine Mn-Zn correlations are a useful discriminator for source variation and recommend the use of olivine for a pyroxenite-dominated source relative to olivine for a peridotite-dominated source.
DS201904-0717
2019
Harris, C.Bogdana-Radu, I., Harris, C., Moine, B.N., Costin, G., Cottin, J-Y.Subduction relics in the subcontinental lithospheric mantle evidence from variation in the delta 180 value of eclogite xenolths from the Kaapvaal craton.Contributions to Mineralogy and Petrology, Vol 174, https://doi.org/ 10.1007/s00410-019-1552-zAfrica, South Africadeposit - Roberts Victor, Jagersfontein

Abstract: Mantle eclogites are commonly accepted as evidence for ancient altered subducted oceanic crust preserved in the subcontinental lithospheric mantle (SCLM), yet the mechanism and extent of crustal recycling in the Archaean remains poorly constrained. In this study, we focus on the petrological and geochemical characteristics of 58 eclogite xenoliths from the Roberts Victor and Jagersfontein kimberlites, South Africa. Non-metasomatized samples preserved in the cratonic root have variable textures and comprise bimineralic (garnet (gt)-omphacite (cpx)), as well as kyanite (ky)- and corundum (cor)-bearing eclogites. The bimineralic samples were derived from a high-Mg variety, corresponding to depths of ~ 100-180 km, and a low-Mg variety corresponding to depths of ~ 180-250 km. The high-Al (ky-, cor-bearing) eclogites originated from the lowermost part of the cratonic root, and have the lowest REE abundances, and the most pronounced positive Eu and Sr anomalies. On the basis of the strong positive correlation between gt and cpx ?18O values (r2 = 0.98), we argue that ?18O values are unaffected by mantle processes or exhumation. The cpx and gt are in oxygen isotope equilibrium over a wide range in ?18O values (e.g., 1.1-7.6‰ in garnet) with a bi-modal distribution (peaks at ~ 3.6 and ~ 6.4‰) with respect to mantle garnet values (5.1 ± 0.3‰). Reconstructed whole-rock major and trace element compositions (e.g., MgO variation with respect to Mg#, Al2O3, LREE/HREE) of bimineralic eclogites are consistent with their protolith being oceanic crust that crystallized from a picritic liquid, marked by variable degrees of partial melt extraction. Kyanite and corundum-bearing eclogites, however, have compositions consistent with a gabbroic and pyroxene-dominated protolith, respectively. The wide range in reconstructed whole-rock ?18O values is consistent with a broadly picritic to pyroxene-rich cumulative sequence of depleted oceanic crust, which underwent hydrothermal alteration at variable temperatures. The range in ?18O values extends significantly lower than that of present-day oceanic crust and Cretaceous ophiolites, and this might be due to a combination of lower ?18O values of seawater in the Archaean or a higher temperature of seawater-oceanic crust interaction.
DS201904-0736
2019
Harris, C.Fitzpayne, A., Giuliani, A., Harris, C., Thomassot, E., Cheng, C., Hergt, J.Evidence for subduction related signatures in the southern African lithosphere from the N-O isotopic composition of metasomatic mantle minerals.Geochimica et Cosmochimica Acta, in press available 21p.Africa, South Africadeposit - Bultfontein

Abstract: Current understanding of the fate of subducted material (and related fluids) in the deep Earth can be improved by combining major and trace element geochemistry with stable isotopic compositions of mantle rocks or minerals. Limited isotopic fractionation during high temperature processes means that significant deviations from mantle-like isotope ratios in mantle rocks probably result from recycling of surficial material. To determine the effects and origins of mantle metasomatic fluids/melts, new ?15N and ?18O data have been collected for thirteen mantle xenoliths - harzburgites, wehrlites, lherzolites, and MARID (Mica-Amphibole-Rutile-Ilmenite-Diopside) rocks - from the Bultfontein kimberlite (Kimberley, South Africa), which show varying degrees of metasomatism. The ?18O values of olivine and orthopyroxene in phlogopite-free harzburgites match the mantle composition (?18Oolivine?=?+5.2?±?0.3‰; ?18Oorthopyroxene?=?+5.7?±?0.3‰; 2?s.d.), consistent with previous inferences that harzburgites were formed by interaction with ancient silica-rich melts unrelated to subduction processes. Wehrlite samples display mineral compositional characteristics (e.g., low La/Zr in clinopyroxene) resembling those of other products of kimberlite melt metasomatism, such as PIC (Phlogopite-Ilmenite-Clinopyroxene) rocks. The inferred interaction with kimberlite melts may be responsible for O isotopic disequilibrium between clinopyroxene and olivine (?18O?=?+0.2‰) in the wehrlites of this study. In contrast with broadly mantle-like ?18O values, the ?15N value of phlogopite in a wehrlite sample (+5.9‰) differs from the mantle composition (?15N?=??5?±?2‰). This unusual N isotopic composition in kimberlite-related mantle products might indicate that a recycled crustal component occurred in the source of the Kimberley kimberlites, or was assimilated during interaction with the lithospheric mantle. Similar major and trace element characteristics in clinopyroxene from phlogopite-lherzolite and MARID samples suggest metasomatism by fluids of similar composition. Lherzolite and MARID clinopyroxene ?18O values (as low as +4.4‰) extend below those reported in mantle peridotites (i.e. ?18Oclinopyroxene?=?+5.6?±?0.3‰; 2?s.d.), and strong negative correlations are found between mineral ?18O values and major element compositions (e.g., Na2O contents in clinopyroxene). Furthermore, phlogopite ?15N values (+4 to +7‰) in the studied lherzolite and MARID samples are higher than mantle values. Combined, the low ?18O-high ?15N isotopic signatures of MARID and lherzolite samples suggest progressive mantle metasomatism by a melt containing a recycled oceanic crust (eclogitic) component. This study demonstrates that progressive enrichment of the subcontinental lithospheric mantle may be inextricably linked to plate tectonics via recycling of subducted crustal material into the deep mantle.
DS201904-0747
2019
Harris, C.Howarth, G.H., Moore, A.E., Harris, C., van der Meer, Q.H.A., Le Roux , P.Crustal versus mantle origin of carbonate xenoliths from Kimberley region kimberlites using C-O-Sr-Nd-Pb isotopes and trace element abundances.Geochimica et Cosmochimica Acta, in press available 42p.Africa, South Africageochronology
DS201905-1043
2019
Harris, C.Howarth, G.H., Moore, A.E., Harris, C., van der Meer, Q.H.A., Le Roux, P.Crustal versus mantle origin of carbonate xenoliths from Kimberly region kimberlites using C-O-Sr-Nd-Pb isotopes and trace element abundances.Geochimica et Cosmochimica Acta, in press available, 16p.Africa, South Africadeposit - Kimberly region

Abstract: Carbonate-bearing assemblages in the mantle have been interpreted to be the source for Si-undersaturated, CO2-rich magmas, including kimberlites. However, direct evidence for carbonate in the mantle is rare in the contemporary literature. Here we present petrography, trace element, and C-O-Sr-Nd-Pb isotope composition for a suite of carbonate xenoliths from the Kimberley region kimberlites to ascertain their mantle or crustal origin and gain insight to the potential for the occurrence of carbonate in the mantle. Carbonate xenoliths were found in large kimberlite blocks from the Bultfontein kimberlite and Big Hole region. The xenoliths are characterised by pale green alteration margins made of fine-grained microlites of an unknown mineral as well as spherules surrounded by glassy material. They are generally 1–4?cm in size, coarse-grained (1–2?mm), and comprised entirely of calcite. Carbonate xenoliths from the Bultfontein kimberlite have low total REE concentrations (0.2–4.9?ppm), constant 87Sr/86Sri (0.7047–0.7049) combined with variable ?Ndi (?0.1 to ?26.2) and 206Pb/204Pbi, 207Pb/204Pbi, and 208Pb/204Pbi of 16.7–18.8, 15.3–15.6, 36.5–38.4, respectively. Xenoliths from the Big Hole sample have higher 87Sr/86Sri (0.7088–0.7095), lower ?Ndi (?24.5 to ?3.8), and 206Pb/204Pbi, 207Pb/204Pbi, and 208Pb/204Pbi of 18.9–19.9, 15.7–15.8, 38.4–38.8, respectively. The ?13C values for both Bultfontein (?5.7 to ?6.6‰) and Big Hole (?4.7 to ?5.4‰) carbonates are within the typical range expected for mantle-derived carbonate. The ?18O values (15.5–17.5‰) are higher than those of mantle silicate rocks, indicative of late-stage low-temperature interaction with fluids; a common feature of groundmass calcite in the Kimberley kimberlites. The Sr- and C- isotope composition of the Bultfontein xenoliths indicates a mantle origin whereas the Big Hole xenolith Sr- and C-isotopes are more ambiguous. Isotope mixing models are inconsistent with interaction between the host kimberlite and carbonate xenoliths. Correlation between ?Ndi and ?18O values for the Bultfontein xenoliths indicates late-stage interaction with low-temperature fluids, which may also be responsible for the large range in ?Ndi. This in turn indicates that the highest ?Ndi of ?0.1 represents the primary carbonate xenolith signature, and this value overlaps typical Group I kimberlites. We discuss two possible origins for the carbonate xenoliths. (1) Carbonate xenoliths from the sub-continental lithospheric mantle (SCLM), where quenched margins and the large range of ?Ndi are related to formation in the mantle. (2) Carbonate xenoliths from an earlier phase of carbonatite magmatism. The similarity of isotope signatures of the Bultfontein carbonates to Group I kimberlite may further suggest a link between kimberlite and carbonatite volcanism such as observed elsewhere in the world.
DS202102-0225
2020
Harris, C.Smart, K.A., Tappe, S., Woodland, A.B., Greyling, D.R., Harris, C., Gussone, N.Constraints on Archean crust recycling and the origin of mantle redox variability from delta 44/40 Ca - delta 18O - fO2 signatures of cratonic eclogites.Earth and Planetary Science Letters, doi.org/10.1016/ j.epsl.2020. 116720 19p. PdfAfrica, South Africadeposit - Bellsbank

Abstract: The nature of the deep calcium geochemical cycle through time is unresolved, in part due to the dearth of information about the calcium isotope composition of Archean recycled oceanic crust. Remnants of such ancient oceanic crust are preserved in the form of cratonic mantle eclogites, brought to surface as xenoliths in kimberlite magma eruptions. The ? 44 / 40Ca of fresh mantle-derived eclogite xenoliths (i.e., garnet and omphacite mineral separates) from the Bellsbank kimberlite on the Kaapvaal craton in South Africa are presented here in combination with their trace element compositions, garnet Fe3+ contents and ?18O values. The studied Bellsbank eclogite xenoliths have geochemical compositions that indicate oceanic crustal protoliths, with bulk Al2O3 from 15 to 27 wt.%, Eu anomalies from 0.8 to 2.6 and, significantly, garnet ?18O values from +2.7 to +6.2‰. Garnet Fe3+/?Fe contents yield logfO2(?FMQ) values between -4.0 and -1.2 for a depth range of 110-180 km, recording strong redox heterogeneity of the eclogite component within the Archean Kaapvaal mantle lithosphere. Reconstructed bulk eclogite MgO contents correlate negatively with fO2, suggesting that the redox compositions are related to magmatic differentiation during oceanic crust formation, excluding secondary metasomatic overprints. These data may thus emphasize that Archean basaltic oceanic crust had a similarly variable redox composition to modern MORB-type crust. Reconstructed bulk ? 44 / 40Ca values for the Bellsbank eclogites range from +0.28 to +1.56‰. Although some of the xenoliths have ? 44 / 40Ca values that overlap with the average mantle composition and modern MORB (+0.94 ± 0.1 and +0.83 ± 0.05‰), half of our dataset shows excursions to more extreme Ca isotopic compositions. Both higher and lower ? 44 / 40Ca relative to mantle compositions are recorded by the eclogites, with a general negative correlation with ?18O suggestive of seawater-alteration of oceanic crust. The combined low ? 44 / 40Ca (+0.28‰) and ?18O (+3.4‰) measured for one eclogite xenolith may record a subtle imprint by carbonate-rich mantle melts, which are known to contain isotopically light calcium contributed by recycled sediments. In contrast, the high ? 44 / 40Ca of up to +1.56‰ for some eclogite xenoliths, coupled with strong LREE depletion, can be explained by calcium isotope fractionation during partial melting. The protracted history of recycled oceanic crust as probed by cratonic mantle eclogites is recorded by their highly variable ? 44 / 40Ca-?18O-fO2 signatures. Whereas some of this heterogeneity can be linked to processes that operated on the Archean ocean floor such as seawater-alteration of basaltic crust, other sources of compositional variability are introduced by loss and addition of melts during subduction recycling and mantle residence. The observed ? 44 / 40Ca complexity of ancient recycled oceanic crust components at the scale of a single mantle-derived eclogite xenolith suite implies that mantle plume sourced intraplate magmas should reveal similarly strong calcium isotope variations contributed by apparently essential recycled crust components - as observed in the global oceanic island basalt record.
DS202107-1113
2021
Harris, C.W.Miller, M.S., Zhang, P., Dahlquist, M.P., West, A.J., Becker, T.W., Harris, C.W.Inherited lithospheric structures control arc-continent collisional heterogeneity. Sunda-Banda ArcGeology Today, Vol. 49, pp. 652-656.Australia, Asiageophysics, seismics

Abstract: From west to east along the Sunda-Banda arc, convergence of the Indo-Australian plate transitions from subduction of oceanic lithosphere to arc-continent collision. This region of eastern Indonesia and Timor-Leste provides an opportunity for unraveling the processes that occur during collision between a continent and a volcanic arc, and it can be viewed as the temporal transition of this process along strike. We collected a range of complementary geological and geophysical data to place constraints on the geometry and history of arc-continent collision. Utilizing ?4 yr of new broadband seismic data, we imaged the structure of the crust through the uppermost mantle. Ambient noise tomography shows velocity anomalies along strike and across the arc that are attributed to the inherited structure of the incoming and colliding Australian plate. The pattern of anomalies at depth resembles the system of salients and embayments that is present offshore western Australia, which formed during rifting of east Gondwana. Previously identified changes in geochemistry of volcanics from Pb isotope anomalies from the inner arc islands correlate with newly identified velocity structures representing the underthrusted and subducted Indo-Australian plate. Reconstruction of uplift from river profiles from the outer arc islands suggests rapid uplift at the ends of the islands of Timor and western Sumba, which coincide with the edges of the volcanic-margin protrusions as inferred from the tomography. These findings suggest that the tectonic evolution of this region is defined by inherited structure of the Gondwana rifted continental margin of the incoming plate. Therefore, the initial template of plate structure controls orogenesis.
DS1920-0234
1925
Harris, D.Harris, D.Pioneer, Soldier and Politician Summaried Memories of Col. Sir. D. Harris.London: Sampson Low, Marston., 306P.South AfricaKimberley, Politics, Biography
DS1995-0756
1995
Harris, D.Harris, D.Mineral resource assessment -perspectives on the past and present and speculation on future directionsNonRenewable Resources, Vol. 4, No. 3, Fall, pp. 213-232United StatesEconomics, Mineral resource -methodology discussion
DS1996-0604
1996
Harris, D.Harris, D., Rieber, M.Commentary and critique of accounting for mineral resources: issues andBEA's initial estimatesNonrenewable Resources, Vol. 5, No. 1, pp. 7- 21United StatesGeostatistics, reserves, depletion, Economics - accounting, green accounting, Government
DS2002-0026
2002
Harris, D.Allibone, A.H., McGuaig, T.C., Harris, D., EtheridgeStructural controls on gold mineralization at the Ashanti deposit, Obuasi GhanaSociety of Economic Geologists Special Publication, No.9,pp.65-93.GhanaGold, fault zones, Birimian, Deposit - Ashanti
DS201312-0605
2013
Harris, D.Miller, E.L., Solovev, A.V., Prokopiev, A.V., Toro, J., Harris, D., Kuzmichev, A.B., Gehrels, G.E.Triassic river systems and the paleo-Pacific margin of northwestern Pangea. Lena River systemGondwana Research, Vol. 23, 4, pp. 1631-1645.RussiaSource areas
DS1992-0390
1992
Harris, D.C.Drahovzal, J.A., Harris, D.C., Wickstrom, L.H., Walker, D.The East continent rift basin: a new discoveryIndiana Publishing Cincinnati Arch Consortium Special Report, No. 52, 25pIndiana, Kentucky, OhioStructure, Rift Basin
DS1994-0098
1994
Harris, D.C.Ballantyne, S.B., Harris, D.C.The exploration significance of central Alberta: modern and Tertiaryalluvial platinum group minerals, chromites, ilmenites and placer gold.Geological Survey of Canada forum, Handout 1p.AlbertaGeochemistry, Heavy minerals
DS1994-0099
1994
Harris, D.C.Ballantyne, S.B., Harris, D.C.Alluvial gold, platinum group minerals and diamond indicator minerals from modern tertiary drainages in central Alberta.Geological Survey of Canada Open Forum January 17-19th. Abstracts only, p. 9, 10.AlbertaGeomorphology, Indicator minerals
DS1997-0072
1997
Harris, D.C.Ballantyne, S.B., Harris, D.C.Alluvial platinum group minerals and gold in Alberta: results from exploration and their significance to explGeological Survey of Canada (GSC) Bulletin., No. 500, pp. 279-329.AlbertaGeochemistry - not specific to diamonds
DS1990-0618
1990
Harris, D.P.Guocheng Pan, Harris, D.P.Three nonparametric techniques for the optimum discretization of quantitative geological variablesMath. Geol, Vol. 22, No. 6, pp. 699-722GlobalGeostatistics, Nonparametric techniques
DS1991-0627
1991
Harris, D.P.Guocheng Pan, Harris, D.P.A new multidimensional scaling technique based upon associations of triple objects -Pijk and its application to the analysis of geochemical dataMath. Geol, Vol. 23, No. 6, August pp. 861-886GlobalGeostatistics, Geochemistry
DS1991-0628
1991
Harris, D.P.Guocheng Pan, Harris, D.P.Geology -exploration endowment models for simultaneous estimation of discoverable mineral resources and endowmentMathematical Geology, Vol. 23, No. 4 May pp. 507-540GlobalMineral resources, Models
DS1992-0630
1992
Harris, D.P.Guocheng Pan, Harris, D.P.Decomposed and weighted characteristic analysis for the quantitative estimation of mineral resourcesMathematical Geology, Vol. 24, No. 7, pp. 807-824ChinaGeostatistics, Pegmatites
DS1992-0631
1992
Harris, D.P.Guocheng Pan, Harris, D.P.Delineation in intrinsic unitsMathematical Geology, Vol. 25, No. 1, January pp. 9-40GlobalGeostatistics, Computer Program
DS1992-0632
1992
Harris, D.P.Guocheng Pan, Harris, D.P.Estimating a favourability equation for the integration of geodat a and selection of mineral exploration targetsMathematical Geology, Vol. 24, No. 2, February pp. 177-202GlobalGeostatistics, Mineral exploration targets
DS1993-0631
1993
Harris, D.P.Harris, D.P., Reiber, M.Evaluation of the United States Geological Survey (USGS)'s three step assessmentmethodologyUnited States Geological Survey (USGS) Open File, No. 93-0258 A, B, 675p. $ 101. 75 discs $ 20.00United StatesEconomics, Assessment methodology
DS1995-1854
1995
Harris, D.P.Suslick, S.B., Harris, D.P., Allan, L.H.E.SERFIT: an algorithm to forecast mineral trendsComputers and Geosciences, Vol. 21, No. 5, pp. 703-713GlobalComputer program -SERFIT., Economics
DS201605-0843
2016
Harris, G.Harris, G.Mantle chemistry and age beneath the Darby kimberlite, NW Rae Craton.DCO Edmonton Diamond Workshop, June 8-10Canada, Northwest TerritoriesDeposit - Darby
DS201708-1664
2017
Harris, G.Harris, G.Mantle composition, age and geotherm beneath the Darby kimberlite field, west central Rae craton.11th. International Kimberlite Conference, PosterCanada, Yukondeposit - Darby

Abstract: The Rae craton in Canada’s North contains several kimberlite fields and has been the subject of episodic diamond exploration, with proven diamond-bearing deposits. However, relatively little is known about the deep mantle lithosphere that underpins the architecturally complex crust of this craton. The Darby Kimberlite field, located ~120 km southwest of the community of Kugaaruk, Nunavut, provides an opportunity to study the mantle beneath the western portion of the central Rae craton via mantle xenoliths. The Darby kimberlite field contains eight kimberlite bodies erupted at circa 540 Ma. Five of the kimberlites have proven to be diamond-bearing including the 12 hectare ‘Iceberg’ kimberlite. Mantle xenoliths were collected from kimberlite float above proven kimberlite targets across the property. Most of the surface kimberlite is highly altered and hence the peridotite xenoliths they contain are generally serpentinized or deeply-weathered. Eclogites/pyroxenites were recovered from each locality visited. A total of 33 mantle xenoliths exceeding one cm in maximum dimension (14 peridotites and 19 “eclogites”) were selected for mineral chemistry and bulk analysis. Four peridotite xenoliths contain fresh garnet. Clinopyroxenes from kimberlite heavy mineral concentrate provide a preliminary geotherm for the West Central Rae lithosphere and indicate a lithospheric depth of ~200 km. Using Ni-in-garnet temperatures, four garnet peridotites and 49 peridotitic garnets from concentrate yield two distinct mantle sampling depths. Whole rock Re-depletion ages for Darby peridotites range from Mesoarchean to Paleoproterozoic. Archean whole rock TMA ages for the eclogites/pyroxenites are consistent with a Mesoarchean age for the western Central Rae lithosphere, older than the lithosphere beneath the Repulse Bay block to the East. The anomalously high abundance of eclogite/pyroxenite xenoliths and garnet concentrate found in the Darby field (58 % of xenoliths and 82 % of concentrate) is at odds with the abundance of eclogite thought to be present in cratonic lithospheric mantle from xenocryst studies (~one to five %). The high abundance may be related to the proximity of the field to the proposed suture between the Committee Block and the Queen Maud Block to the far West of the Rae craton
DS201902-0276
2018
Harris, G.Harris, G.Mantle composition, age and geotherm beneath the Darby kimberlite field, west central Rae Craton.University of Alberta, Msc thesis https://doi.org /10.7939/R3NC5SV24 availableCanada, Nunavutdeposit - Darby

Abstract: The Rae Craton, northern Canada, contains several diamondiferous kimberlite fields that have been a focus of episodic diamond exploration. Relatively little is known about the deep mantle lithosphere underpinning the architecturally complex crust. We present bulk and mineral element and isotopic compositional data for peridotite and pyroxenite/eclogite xenoliths from the Darby kimberlites representing fragments of the west central Rae lithosphere, as well as the first kimberlite eruption age of 542.2±2.6 Ma (2 ?; phlogopite Rb-Sr isochron). Darby peridotites have low bulk Al2O3 contents with highly-depleted olivine (median Mg#?=?92.5) characteristic of cratonic lithosphere globally, but more depleted than peridotites from other Rae Craton localities. One peridotite xenolith contains a harzburgitic G10D garnet. Re-Os TRD model ages appear to be the oldest measured to date from peridotites of the Rae lithosphere, having a mode in the early Neoarchean and ranging to the Paleoproterozoic (~2.3 Ga). Concentrate clinopyroxene defines a well constrained mantle geotherm indicating the existence of a ~200 km thick lithosphere at the time of kimberlite eruption, greater than the lithospheric thickness beneath Somerset Island and in good agreement with modern seismic constraints. Nickel-in-garnet thermometry in grains that record temperatures below the mantle adiabat, indicates mantle sampling dominantly in the graphite stability field whereas Al-in-olivine thermometry shows a distinct mantle sampling mode in the diamond stability field. Abundant pyroxenite and eclogite xenoliths are recovered across the Darby property and low-Cr garnet (Cr2O3?
DS202201-0047
2021
Harris, G.Xu, Y., Pearson, G., Harris, G., Kopylova, M., Liu, J.Age and provenance of the lithospheric mantle beneath the Chidliak kimberlite province, southern Baffin Island: implications for the evolution of the North Atlantic craton.GAC/MAC Meeting UWO, 1p. Abstract p. 312.Canada, Baffin Islanddeposit - Chidliak

Abstract: A suite of peridotite xenoliths from the Chidliak kimberlite province provides an ideal opportunity to assess the age of the mantle lithosphere beneath the eastern Hall Peninsula Block (EHPB) in southern Baffin Island, Nunavut and to provide constraints on the lithospheric architecture of this region. The new dataset comprises highly siderophile element (HSE) abundances and Re-Os isotopic compositions for 32 peridotite xenoliths sampled from four Late Jurassic-Early Cretaceous kimberlite pipes (CH-1, -6, -7, and -44). These peridotites represent strongly depleted mantle residues, with bulk-rock and olivine chemistry denoting melt extraction extents of up to 40%. The vast majority of samples show PPGE (Pt and Pd) depletion relative to IPGE (Os, Ir, and Ru) ((Pt/Ir)N: 0.10-0.96, median = 0.57; (Pd/Ir)N: 0.03-0.79, median = 0.24), coupled with mostly unradiogenic Os isotopic compositions (187Os/188Os = 0.1084-0.1170). These peridotites display strong correlations between 187Os/188Os and melt depletion indicators (such as olivine Mg number and bulk-rock Al2O3, (Pd/Ir)N), suggesting that an ancient (~2.8 Ga) melt depletion event governed the formation of the Chidliak lithosphere. The prominent mode of TRDerupt model ages at ca. 2.8 Ga matches the main crust-building ages of the EHPB, demonstrating temporal crust-mantle coupled in the Meso-Neoarchean. These ancient melt-depletion ages are present throughout the depth of the ~ 200 km thick lithospheric mantle column beneath Chidliak. The Meso-Neoarchean formation age of the EHPB mantle broadly coincides with the timing of stabilization of the lithospheric mantle beneath the Greenlandic portion of the North Atlantic Craton (NAC). This, along with the similarity in modal mineralogy, chemical composition and evolutionary history, indicates that the EHPB, southern Baffin Island was once -contiguous with the Greenlandic NAC. The mantle lithosphere beneath both the EHPB and the NAC show a similar metasomatic history, modified by multiple pulses of metasomatism. These multiple metasomatic events combined to weaken and thin the lithospheric mantle, culminating in the formation of the Labrador Sea and Davis Strait separating the EHPB from the Greenlandic NAC in the Paleocene.
DS201712-2688
2017
Harris, G.A.Harris, G.A., Pearson, D.G., Liu, J., Hardman, M.F., Kelsch, D.Mantle composition, age and geotherm beneath the Darby kimberlite field, west central Rae craton.45th. Annual Yellowknife Geoscience Forum, p. 33 abstractCanada, Northwest Territoriesdeposit - Darby

Abstract: New geological and geophysical research on Canada’s Rae craton are providing an increasingly good baseline for diamond exploration. This study uses mantle xenoliths and xenocrysts from the Darby property, located ~200 km southwest of the community of Kugaaruk, Nunavut, to provide new information on the lithospheric mantle and diamond potential of the western portion of the central Rae. Peridotite xenoliths containing enough fresh olivine have a median Mg# value of 92.5, indistinguishable from the median value of 92.6 typical of cratonic peridotites world-wide. Only of the 14 peridotitic xenoliths contain fresh garnet. Of these, garnet in one sample is classified as harzburgitic (G10), giving a minimum pressure of 4.7 GPa using the P38 geobarometer (38 mW/m2 model geothermal gradient), while garnets from three peridotites are classified as lherzolitic (G9). 52 garnets picked from concentrate have lherzolitic affinities. Lherzolitic diopsides from kimberlite heavy mineral concentrate yield a lithospheric thickness of ~ 200 km. The four garnet peridotite xenoliths and 49 peridotitic garnets from concentrate yield two distinct modes in mantle sampling depths using Ni thermometry, when projected to the Cpx geotherm. A cluster of samples from the higher Ca/Cr lherzolitic garnets equilibrated at 765 to 920 °C with a group of peridotitic garnets (50 % of xenoliths and 28 % of concentrate) from the lower Ca/Cr lherzolitic garnets with anomalously high Ti concentrations yielding super-adiabatic TNi values The aluminum-in-olivine thermometer applied to olivines filtered to be “garnet facies yielded a mantle sampling portion of the mantle cargo from the diamond stability field. A suite of pyroxenitic xenoliths are a feature of each Darby kimberlite target. New screening techniques indicate that these rocks likely originate close to the crust mantle boundary. Osmium isotope analyses of the Darby peridotites reveal whole-rock Re-depletion ages ranging from Mesoarchean to Paleoproterozoic. The pyroxenite xenoliths have very radiogenic Os isotope compositions and provide the first age information from pyroxenites/“eclogites” beneath the Rae craton. Their resulting Archean whole rock TMA ages are consistent with a Mesoarchean age of the western Central Rae lithosphere older than the lithosphere beneath the Repulse Bay block in the East section of the Rae craton (Liu et al., 2016. Precambrian Research 272). The highly depleted olivine compositions, thick cold lithosphere, and Archean ages of the Darby peridotite xenoliths clearly indicate the presence of 200 km thick cold cratonic lithospheric mantle beneath the western segment of the central Rae craton circa 540 Ma. The Archean model ages of most of the pyroxenites support this, notwithstanding the fact that some of these rocks could be sampling either crust or mantle lithologies very close to the crust-mantle boundary. Mantle sampling took place well into the diamond stability field at Darby.
DS201808-1751
2018
Harris, G.A.Harris, G.A., Pearson, D.G., Liu, J., Hardman, M.F., Snyder, D.B., Kelsch, D.Mantle composition, age and geotherm beneath the Darby kimberlite field, west central Rae craton.Mineralogy and Petrology, doi.org/10.1007/s00710-018-0609-4 14p.Canada, Northwest Territoriesdeposit - Darby

Abstract: New geological and geophysical research on Canada’s Rae craton are providing an increasingly good baseline for diamond exploration. This study uses mantle xenoliths and xenocrysts from the Darby property, located ~200 km southwest of the community of Kugaaruk, Nunavut, to provide new information on the lithospheric mantle and diamond potential of the western portion of the central Rae. Peridotite xenoliths containing enough fresh olivine have a median Mg# value of 92.5, indistinguishable from the median value of 92.6 typical of cratonic peridotites world-wide. Only of the 14 peridotitic xenoliths contain fresh garnet. Of these, garnet in one sample is classified as harzburgitic (G10), giving a minimum pressure of 4.7 GPa using the P38 geobarometer (38 mW/m2 model geothermal gradient), while garnets from three peridotites are classified as lherzolitic (G9). 52 garnets picked from concentrate have lherzolitic affinities. Lherzolitic diopsides from kimberlite heavy mineral concentrate yield a lithospheric thickness of ~ 200 km. The four garnet peridotite xenoliths and 49 peridotitic garnets from concentrate yield two distinct modes in mantle sampling depths using Ni thermometry, when projected to the Cpx geotherm. A cluster of samples from the higher Ca/Cr lherzolitic garnets equilibrated at 765 to 920 °C with a group of peridotitic garnets (50 % of xenoliths and 28 % of concentrate) from the lower Ca/Cr lherzolitic garnets with anomalously high Ti concentrations yielding super-adiabatic TNi values The aluminum-in-olivine thermometer applied to olivines filtered to be “garnet facies yielded a mantle sampling portion of the mantle cargo from the diamond stability field. A suite of pyroxenitic xenoliths are a feature of each Darby kimberlite target. New screening techniques indicate that these rocks likely originate close to the crust mantle boundary. Osmium isotope analyses of the Darby peridotites reveal whole-rock Re-depletion ages ranging from Mesoarchean to Paleoproterozoic. The pyroxenite xenoliths have very radiogenic Os isotope compositions and provide the first age information from pyroxenites/“eclogites” beneath the Rae craton. Their resulting Archean whole rock TMA ages are consistent with a Mesoarchean age of the western Central Rae lithosphere older than the lithosphere beneath the Repulse Bay block in the East section of the Rae craton (Liu et al., 2016. Precambrian Research 272). The highly depleted olivine compositions, thick cold lithosphere, and Archean ages of the Darby peridotite xenoliths clearly indicate the presence of 200 km thick cold cratonic lithospheric mantle beneath the western segment of the central Rae craton circa 540 Ma. The Archean model ages of most of the pyroxenites support this, notwithstanding the fact that some of these rocks could be sampling either crust or mantle lithologies very close to the crust-mantle boundary. Mantle sampling took place well into the diamond stability field at Darby.
DS201902-0319
2019
Harris, G.A.Scott, J.M., Liu, J., Pearson, D.G., Harris, G.A., Czertowicz, T.A., Woodland, S.J., Riches, A.J.V., Luth, R.W.Continent stabilization by lateral accretion of subduction zone-processed depleted mantle residues: insights from Zealandia.Earth and Planetary Science Letters, Vol. 507, pp. 175-186.Mantleperidotite

Abstract: To examine how the mantle lithosphere stabilises continents, we present a synthesis of the mantle beneath Zealandia in the SW Pacific Ocean. Zealandia, Earth's “8th continent”, occurs over 4.9 M km2 and comprises a fore-arc, arc and back-arc fragment rifted from the Australia-Antarctica Gondwana margin 85 Myr ago. The oldest extant crust is ?500 Ma and the majority is Permian-Jurassic. Peridotitic rocks from most known locations reveal the underpinning mantle to comprise regional domains varying from refractory (Al2O3 < 1 wt%, olivine Mg# > 92, spinel Cr# up to 80, Pt/Ir < 1) to moderately depleted (Al2O3 = 2-4 wt%, olivine Mg# ?90.5, spinel Cr# < ?60). There is no systematic distribution of these domains relative to the former arc configuration and some refractory domains underlie crust that is largely devoid of magmatic rocks. Re-depletion Os model ages have no correlation with depletion indices but do have a distribution that is very similar to global convecting mantle. Whole rock, mineral and isotopic data are interpreted to show that the Zealandia mantle lithosphere was constructed from isotopically heterogeneous convecting mantle fragments swept into the sub-arc environment, amalgamated, and variably re-melted under low-P hydrous conditions. The paucity of mafic melt volumes in most of the overlying crust that could relate to the depleted domains requires melting to have been followed by lateral accretion either during subduction or slab rollback. Recent Australia-Pacific convergence has thickened portions of the Zealandia mantle to >160 km. Zealandia shows that the generation of refractory and/or thick continental lithosphere is not restricted to the Archean. Since Archean cratons also commonly display crust-mantle age decoupling, contain spinel peridotites with extreme Cr# numbers that require low-P hydrous melting, and often have a paucity of mafic melts relative to the extreme depletion indicated by their peridotitic roots, they too may - in part - be compilations of peridotite shallowly melted and then laterally accreted at subduction margins.
DS201907-1524
2019
Harris, G.A.Anzolini, C., Wang, F., Harris, G.A., Locock, A.J., Zhang, D., Nestola, F., Peruzzo, L., Jacobsen, S.D., Pearson, D.G.Nixonite, Na2Ti6O13, a new mineral from a metasomatized mantle garnet pyroxenite from the western Rae Craton, Darby kimberlite field, Canada.American Mineralogist, in press available 26p.Canada, Nunavutdeposit - Darby

Abstract: Nixonite (IMA 2018-133), ideally Na2Ti6O13, is a new mineral found within a heavily-metasomatized pyroxenite xenolith from the Darby kimberlite field, beneath the west central Rae Craton, Canada. It occurs as microcrystalline aggregates, 15 to 40 ?m in length. Nixonite is isostructural with jeppeite, K2Ti6O13, with a structure consisting of edge- and corner-shared titanium-centered octahedra that enclose alkali-metal ions. The Mohs hardness is estimated to be between 5 and 6 by comparison to jeppeite and the calculated density is 3.51(1) g/cm3. Electron microprobe wavelength-dispersive spectroscopic analysis (average of 6 points) yielded: Na2O 6.87, K2O 5.67 CaO 0.57, TiO2 84.99, V2O3 0.31, Cr2O3 0.04, MnO 0.01, Fe2O3 0.26, SrO 0.07, total 98.79 wt%. The empirical formula, based on 13 O atoms, is: (Na1.24K0.67Ca0.06)?1.97(Ti5.96V0.023Fe0.018)?6.00O13 with minor amounts of Cr and Mn. Nixonite is monoclinic, space group C2/m, with unit-cell parameters a = 15.3632(26) Å, b = 3.7782(7) Å, c = 9.1266(15) Å, ? = 99.35(15)º and V = 522.72(1) Å3, Z = 2. Based on the average of seven integrated multi-grain diffraction images, the strongest diffraction lines are [dobs in Å (I in %) (h k l)]: 3.02 (100) (3 1 0) , 3.66 (75) (1 1 0), 7.57 (73) (2 0 0), 6.31 (68) (2 0 -1), 2.96 (63) (3 1 -1), 2.96 (63) (2 0 -3) and 2.71 (62) (4 0 2). The five main Raman peaks of nixonite, in order of decreasing intensity, are at: 863, 280, 664, 135 and 113 cm-1. Nixonite is named after Peter H. Nixon, a renowned scientist in the field of kimberlites and mantle xenoliths. Nixonite occurs within a pyroxenite xenolith in a kimberlite, in association with rutile, priderite, perovskite, freudenbergite and ilmenite. This complex Na-K-Ti rich metasomatic mineral assemblage may have been produced by a fractionated Na-rich kimberlitic melt that infiltrated a mantle-derived garnet pyroxenite and reacted with rutile during kimberlite crystallization.
DS1900-0758
1909
Harris, G.D.Harris, G.D.Magnetic Rocks. ( a Note on the Peridotite in Arkansas.)Science., Vol. 29, P. 384.United States, Gulf Coast, ArkansasPetrology
DS1860-0510
1886
Harris, G.F.Harris, G.F.South African Diamond Fields (1886)Belgravia., Vol. 13, P. 224.Africa, South AfricaHistrory
DS1995-0757
1995
Harris, H.Harris, H.Fancy colour diamondsGems and Gemology, Vol. 31, summer p. 141.GlobalBook review, Fancoldi Registered Trust Publishing $ 175.00 United States
DS1992-0457
1992
Harris, J.Fett, A., Brey, G., Otter, M., Harris, J.Trace elements in rutiles from diamonds: comparison with rutiles fromeclogites, granulites and amphibolites and influence of pressure andtemperatureTerra Abstracts, supplement to Terra Nova, Vol. 4, IVth International Symposium Exp. Petrology, p. 17Wyoming, AustraliaMicroscopy
DS1992-0980
1992
Harris, J.Macpherson, C., Mattey, D.P., Harris, J.Oxygen isotope analysis of microgram quantities of silicate by a laser fluorination technique dat a for syngenetic inclusions in diamondV.m. Goldschmidt Conference Program And Abstracts, Held May 8-10th. Reston, p. A 66. abstractGlobalDiamond inclusions, Geochemistry
DS1992-1012
1992
Harris, J.Mattey, D.P., Harris, J.Oxygen isotope analysis of syngenetic silicate inclusions in diamond by laser microprobeEos Transactions, Vol. 73, No. 14, April 7, supplement abstracts p.336South Africa, RussiaWesselton, Mir, Diamond inclusions
DS1993-1296
1993
Harris, J.Rencz, A., Harris, J., Toubourg, J., Ballantye, B., Green, S.Remote sensing applications in geosciences: a an introductionProspectors and Developers Association of Canada (PDAC) Meeting Workshop held April 1, Toronto, approx. 100pGlobalBook -table of contents, Remote sensing
DS1995-0541
1995
Harris, J.Finnie, K., Fisher, D., Griffin, W.L., Harris, J., SobolevNitrogen aggregation in metamorphic diamonds from KazakhstanGeochimica et Cosmochimica Acta, Vol. 58, No.23, pp. 5173-5177.Russia, KazakhstanMetamorphic rocks, microdiamonds, Kokchetav massif
DS1995-0758
1995
Harris, J.Harris, J., Van Couvering, J.Mick aridity and the paleoecology of volcanically influenced ecosystemsGeology, Vol. 23, No. 7, July pp. 593-596KenyaVolcanicity volcanics, Arid environments
DS1997-0479
1997
Harris, J.Harris, J., Hutchison, M.T., Harte, B.A new tetragonal silicate mineral occurring as inclusions in lower mantlediamonds.Nature, Vol. 387, No. 6632, May 29, pp. 486-488.MantleDiamond inclusions - silicate
DS1997-0749
1997
Harris, J.McCammon, C., Hutchison, M., Harris, J.Ferric iron content of mineral inclusions in diamonds from Sao Luiz: a view from the lower mantle.Science, Vol. 278, No. 5337, Oct. 17, pp. 434-BrazilDiamond inclusions, Deposit - San Luiz
DS1998-0514
1998
Harris, J.Girnis, A.V., Stachel, T., Brey, G., Harris, J., PhilipInternally consistent geothermobarometers for garnet harzburgites7th International Kimberlite Conference Abstract, pp. 253-5.GlobalGeothermometry, Garnet harzburgite compositions
DS1998-1579
1998
Harris, J.Wilkinson, L., Harris, J., Kjarsgaard, B.Searching for kimberlite: use of clay fraction till geochemistry in the Lacde Gras area, northwest Territories.Yellowknife Geoscience Forum Nov. 25-27, p. 116-17. abstractNorthwest TerritoriesGeochemistry, geomorphology
DS1998-1580
1998
Harris, J.Wilkinson, L., Harris, J., Kjarsgaard, B., Bowie, C.Preliminary weights of evidence modeling of kimberlite distributions in the Lac de Gras area, using GIS tech.Geological Association of Canada (GAC)/Mineralogical Association of Canada (MAC) Abstract Volume, p. A198. abstract.Northwest TerritoriesComputer - GIS, Geochemistry, geophysics - magnetics
DS1999-0792
1999
Harris, J.Wilkinson, L., Harris, J., Kjarsgaard, B.Searching for kimberlite evaluation of till geochemistry in the Lac de Gras- using GIS spatialAssocation of Exploration Geologists (AEG) 19th. Symposium Program Abstracts, p. 102-4. AbstractNorthwest TerritoriesGIS spatial analysis, geomorphology, Lac de Gras area
DS1999-0793
1999
Harris, J.Wilkinson, L., Harris, J., Kjarsgaard, B., Cowie, C.GIS ( Geographic Information Systems) for kimberlite explorationAssocation of Exploration Geologists (AEG) 19th. Diamond Exploration Methods Case Histories, pp. 86-107.Northwest TerritoriesGIS - case study Lac de Gras, Geochemistry, geomorphology
DS2001-1237
2001
Harris, J.Wilkinson, L., Harris, J., Kjarsgaard, B., McClenaghanInfluence of till thickness and texture on till geochemistry in the Lac deGras area, applications..Geological Survey of Canada Current Research, C9, 26p.Northwest TerritoriesRegional kimberlite exploration, Geochemistry - till, geomorphology
DS2002-0654
2002
Harris, J.Harris, J.Diamond provenance through shape, colour, surface features and valueEos, American Geophysical Union, Spring Abstract Volume, Vol.83,19, 1p.South Africa, BotswanaClassification - surface, observations, Deposit - Venetia
DS2003-0158
2003
Harris, J.Brey, G.P., Bulatov, V., Girnis, A., Harris, J., Stachel, T.Ferropericlase - a lower mantle phase in the upper mantle8 Ikc Www.venuewest.com/8ikc/program.htm, Session 6, AbstractGuineaMantle petrology
DS2003-0474
2003
Harris, J.Glinnemann, J., Kusaka, K., Harris, J., Bleisteiner, B., Winkler, B.Oriented graphite single crystal inclusions in diamond8ikc, Www.venuewest.com/8ikc/program.htm, Session 3, POSTER abstractNorthwest TerritoriesDiamonds - inclusions, Deposit - Panda
DS200412-0205
2003
Harris, J.Brey, G.P., Bulatov, V., Girnis, A., Harris, J., Stachel, T.Ferropericlase - a lower mantle phase in the upper mantle.8 IKC Program, Session 6, AbstractAfrica, GuineaMantle petrology
DS200512-0117
2005
Harris, J.Brown, O.H., Utting, D.J., Little, E.C., Grunsky, E.C., Harris, J., Peter, P.Remote predictive mapping of surficial geology in Nunavut using supervised classification techniques of Land sat and RADARSAT I data.GAC Annual Meeting Halifax May 15-19, Abstract 1p.Canada, NunavutRemote sensing
DS200612-0535
2006
Harris, J.Harris, J.Diamond occurrence and evolution in the mantle.GIA Gemological Research Conference abstract volume, Held August 26-27, p. 17-18. 1/2p.MantleMineral chemistry
DS200712-0414
2007
Harris, J.Harris, J., Stachel, T.Damtshaa versus Orapa: a mineralogical comparison of inclusion bearing diamonds from new and old Botswana mines.Geological Association of Canada, Gac-Mac Yellowknife 2007, May 23-25, Volume 32, 1 pg. abstract p.37-38.Africa, BotswanaMineral chemistry
DS200812-0224
2008
Harris, J.Clement, B.M., Haggerty, S., Harris, J.Magnetic inclusions in diamonds.Earth and Planetary Science Letters, Vol. 267, 1-2, pp.333-340.Africa, BotswanaOrapa - diamond inclusions
DS200912-0087
2009
Harris, J.Burgess, R., Cartigny, P., Harrison, D., Hobson, E., Harris, J.Volatile composition of Micro inclusions in diamonds from the PAnd a kimberlite, Canada: implications for chemical and isotopic heterogeneity in the mantle.Geochimica et Cosmochimica Acta, Vol. 73, 6, pp. 1779-1794.Canada, Northwest TerritoriesDeposit - Panda
DS201012-0267
2010
Harris, J.Harris, J.Relatively small but definitely beautiful: the genesis of diamond.13th. IAGOD Symposium, April 6-9, Adelaide Australia, TechnologyDiamond genesis
DS201012-0268
2009
Harris, J.Harris, J., Stachel, T.Professor Peter Deines ( 1936-2009). Tribute.Lithos, Vol. 112 S p. 775.Tribute to Deines
DS201012-0284
2010
Harris, J.Honda, M., Phillips, D., Harris, J., Matsumoto, T.Distinct neon isotope compositions found in polycrystalline diamonds and framesites from the Jwaneng kimberlite pipe, Botswana.Goldschmidt 2010 abstracts, abstractAfrica, BotswanaGeochronology
DS201012-0692
2010
Harris, J.Shaw, J., Sharpe, D., Harris, J.A flowline map of glaciated Canada based on remote sensing data.Canadian Journal of Earth Sciences, Vol. 47, 1, pp. 89-101.CanadaGeomorphology
DS201012-0820
2010
Harris, J.Viljoen, F., Dobbe, R., Harris, J., Smit, B.Trace element chemistry of mineral inclusions in eclogitic diamonds from the Premier ( Cullinan) and Finsch kimberlites: implications for evolution mantleLithos, Vol. 118, 1-2, pp. 156-168.Africa, South AfricaDiamond genesis, source
DS201212-0462
2012
Harris, J.Melton, G., Stachel, T., Stern, R., Harris, J., Carlson, J.The micro and macrodiamond relationship at the PAnd a kimberlite (Ekati mine) Canada.GEM 2012, PPT. 19p.Canada, Northwest TerritoriesMicrodiamonds
DS201604-0589
2016
Harris, J.Agrosi, G., Nestola, F., Tempestra, G., Bruno, M., Scandale, E., Harris, J.X-ray topographic study of a diamond from Udachnaya: implications for the genetic nature of inclusions.Lithos, Vol. 248-251, pp. 153-159.RussiaDeposit - Udachnaya

Abstract: In recent years, several studies have focused on the growth conditions of the diamonds through the analysis of the mineral inclusions trapped in them. In these studies, it is crucial to distinguish between protogenetic, syngenetic and epigenetic inclusions. X-ray topography (XRDT) can be a helpful tool to verify, in a non-destructive way, the genetic nature of inclusions in diamond. With this aim, a diamond from the Udachnaya kimberlite, Siberia, was investigated. The diamond, previously studied by Nestola et al. (2011), has anomalous birefringence and the two largest olivines have typical “diamond-imposed” shapes. The study of the topographic images shows that the diamond exhibits significant deformation fields related to post growth plastic deformation. The absence of dislocations starting from the olivine inclusions, and the dark contrasts around them represent the main results obtained by XRDT, contributing to the elucidation of the relationships between the diamond and the olivines at the micron-meter scale. The dark halo surrounding the inclusions was likely caused by the effect of different thermo-elastic properties between the diamond and the inclusions. The absence of dislocations indicates that the diamond-imposed morphology did not produce the volume distortion commonly associated with the entrapment of the full-grown inclusions and, thus, only based on such evidence, a syngenetic origin could be proposed. In addition, stepped figures optically observed at the interface between diamond and one of the olivines suggest processes of selective partial dissolution that would contribute to a change in the final morphology of inclusions. These results show that a diamond morphology may be imposed to a full-grown (protogenetic) olivine during their encapsulation, suggesting that the bulk of the inclusion is protogenetic, whereas its more external regions, close to the diamond-inclusion interface, could be syngenetic.
DS201705-0807
2017
Harris, J.Alvaro, M., Angel, R., Nimis, P., Milani, S., Harris, J., Nestola, F.Orientation relationship between diamond and magnesiochromite inclusions.European Geosciences Union General Assembly 2017, Vienna April 23-28, 1p. 12200 AbstractRussiaDeposit - Udachnaya

Abstract: The correct determination of the relative crystallographic orientations of single crystals has many applications. When single crystals undergo phase transitions, especially at high pressures, the relative orientations of the two phases yields insights into transition mechanisms (Dobson et al 2013). On the other hand, determination of the crystallographic orientations of minerals included in diamonds can provide insights into the mechanisms of their entrapment and the timing of their formation relative to the host diamond (e.g. Nestola et al. 2014, Milani et al. 2016). The reported occurrence of non-trivial orientations for some minerals in diamonds, suggesting an epitaxial relationship, has long been considered to reflect contemporaneous growth of the diamond and the inclusion (e.g. syngenesis). Correct interpretation of such orientations requires (i) a statistically significant crystallographic data set for single and multiple inclusions in a large number of diamonds, and (ii) a robust data-processing method, capable of removing ambiguities derived from the high symmetry of the diamond and the inclusion. We have developed a software to perform such processing (OrientXplot, Angel et al. 2015), starting from crystallographic orientation matrixes obtained by X-ray diffractometry or EBSD data. Previous studies of inclusions in lithospheric diamonds, by single-crystal X-ray diffraction and EBSD, indicate a wide variety in the orientations of different inclusion phases with respect to their diamond host (Futergendler & Frank-Kamenetsky 1961; Frank-Kamenetsky 1964; Wiggers de Vries et al. 2011; Nestola et al. 2014, Milani et al. 2016). For example, olivine inclusions in lithospheric diamonds from Udachnaya do not show any preferred orientations with respect to their diamond hosts, but multiple inclusions in a single diamond often show very similar orientations within few degrees. In the present work on magnesiochromite inclusions in diamonds from Udachnaya, there is a partial orientation between inclusion and host. A (111) plane of each inclusion is sub-parallel to a {111} plane of their diamond host, but with random orientations of the magnesiochromite [100], [010] and [001] relative to the diamond. In one case, where a single inclusion comprised a magnesiochromite-olivine touching pair, the magnesiochromite was oriented as noted above and the olivine showed a random orientation. The implications of these observations for the mechanisms of diamond growth will be explored and the results will be compared and combined with previous work.
DS201812-2870
2018
Harris, J.Regier, M.E., Pearson, D.G., Stachel, T., Stern, R.A., Harris, J.Tracing the formation and abundance of superdeep diamonds.2018 Yellowknife Geoscience Forum , p. 63. abstractAfrica, Guineadeposit - Kankan

Abstract: Super-deep diamonds from the transition zone and lower mantle are valuable targets for mining, as they are often large, gem-quality1 or ultra-valuable type IIb stones2. Hence, in mine prospects, it may become important to determine the various populations of sub-lithospheric diamonds. Unambiguously identifying a diamond’s depth of formation is difficult as some minerals can be indicative of various depth regimes (e.g., ferropericlase, Ca-walstromite, enstatite, clinopyroxene, coesite). Here, we use the oxygen isotope compositions of inclusions in Kankan diamonds from Guinea to distinguish between the various diamond-forming processes that happen at lithospheric, asthenospheric to transition zone, and lower mantle depths. In this way, we hope to establish a process by which isotope geochemistry can better constrain the populations of superdeep diamonds in kimberlites, and can assist in estimating a pipe’s propensity for large, valuable stones. Oxygen isotopic analysis by secondary ion mass spectrometry (SIMS) is a high-precision technique that can track hydrothermal alteration that occurred at or close below the ocean floor. Our analyses of inclusions from Kankan diamonds demonstrate that garnets with 3-3.03 Si cations (pfu) have ?18O that are well-constrained within the normal values expected for peridotitic and eclogitic inclusions, but that garnets with ?3.04 Si cations (pfu) have consistently high ?18O (median: 10‰) that slightly decreases with increasing Cr2O3. We interpret this signal as the reaction between a melted carbonate-rich oceanic slab and normal convecting asthenosphere3. In contrast, retrogressed, or former, bridgmanite has ?18O values similar to primitive mantle, suggesting little involvement of slab melts. In contrast to the worldwide suite of lithospheric inclusions of eclogitic paragenesis (median ?18O of 7.03‰)4,5, diamonds derived from ~250 to 500 km have inclusions with consistent, extremely high oxygen isotopes (median: 9.32‰)6,7, due to the melting of extremely enriched carbonated oceanic crust. Diamonds from the lower mantle, however, have inclusions with primitive mantle oxygen isotopes, suggesting a different formation process. The clear distinction in inclusion ?18O between lithospheric, asthenospheric to transition zone, and lower mantle diamond populations is useful in informing the depth regime of a suite of stones, especially those with inclusions of ambiguous depths (e.g., clinopyroxene, coesite, Ca-walstromite, enstatite, ferropericlase, etc.). For instance, we are currently searching for exotic oxygen isotopes in ferropericlase that indicate asthenospheric diamond growth, rather than the primitive mantle values expected for lower mantle ferropericlase. In conclusion, oxygen isotopic analyses of diamond inclusions can identify various sublithsopheric diamond populations, and may benefit the assessment of a mine’s potential for large gem-quality, or type IIb diamonds.
DS202201-0024
2021
Harris, J.Lorenzon, S., Nestola, F., Pamato, M.G., Harris, J.Genesis and depth of formation of ferropericlase inclusions within superdeep diamonds.Goldshmidt2021, 1p. abstractSouth America, Brazil, Africa, Guineadeposit - Juina, Kankan

Abstract: Diamonds containing fluid and mineral inclusions that were trapped during formation are the only natural samples capable of probing the deepest portions of the Earth’s mantle (down to ~800 km depth). In order to precisely interpret the mineralogical and geochemical information they provide, the growth relationships between diamonds and inclusions (i.e., whether they formed before or during diamond formation) and the depth at which the inclusions were trapped need to be determined. Ferropericlase [(Mg,Fe)O] is the most abundant inclusion within super-deep diamonds (i.e., those forming between ~300 and more than 800 km depth). Experiments and numerical models using a pyrolitic bulk composition indicate that ferropericlase, comprising 16-20% of the mantle phase assemblage, is stable at depths between 660 and 2900 km and is Mg-rich with XFe ranging from 0.10 to 0.27 (1,2). However, ferropericlase represents 48-53% of the inclusions reported within super-deep diamonds and has a more variable Fe content, with XFe between 0.10 and 0.64 (3). In spite of different efforts explanations of these discrepancies, the precise origin of ferropericlase-bearing diamonds remains unclear. In this study we performed in-situ single-crystal X-ray diffraction analyses on a set of ferropericlase inclusions in super-deep diamonds from Juina (Brazil) and Kankan (Guinea), to determine inclusion-host crystallographic orientation relationships. These analyses were coupled with synchrotron X-ray tomographic microscopy in order to apply elastic and elasto-plastic geobarometry and determine the diamond depth of formation. Electron microprobe analyses on a set of inclusions that were released from the diamond hosts were also conducted to investigate possible relationships between crystallographic data and chemical composition. We assess the most likely scenario for the genesis of ferropericlase inclusions in super-deep diamonds, their depth distribution in the Earth’s mantle and their implications for mantle geochemistry.
DS1994-0718
1994
Harris, J.B.Harris, J.B., Kiefer, J.D.Update on the New Madrid seismic zoneGeotimes, Vol. 39, No. 7, July pp. 14-18.KentuckyGeophysics -seismics, Rifting
DS1995-0759
1995
Harris, J.B.Harris, J.B., et al.S wave seismic reflection profiling over the Reelfoot Scarp: a line between trenching and conventional P-WaveGeological Society of America (GSA) Abstracts, Vol. 27, No. 6, abstract p. A 393.MidcontinentNew Madrid seismics, Reelfoot Zone
DS2001-0216
2001
Harris, J.B.Cox, R.T., Vn Arsdale, R.B., Harris, J.B., Larsen, D.Neotectonics of the southeastern Reelfoot rift zone margin, central United States And implications for regional strainGeology, Vol. 29, No. 5, May, pp. 419-22.Missouri, Mississippi, MidcontinentTectonics, paleoseismology
DS1960-0150
1961
Harris, J.F.Harris, J.F.Summary of the Geology of Tanganyika. Part Iv. Economic Geology.Tanganyika Geological Survey Memoir., No. 1, 143P.Tanzania, East AfricaKimberley
DS1996-0605
1996
Harris, J.H.Harris, J.H., Kesler, S.E.BLASH vs GF Theory in mining investmentSeg Newsletter, No. 26, July pp. 23-24GlobalEconomics, Theory -BLASH
DS1997-1193
1997
Harris, J.H.Van der Pluijm, B.A., Braddocks, J.P., Harris, J.H.Paleostress in cratonic North America: implications for deformation of continental interiors.Science, Vol. 277, No. 5327, Aug. 8, pp. 794-5.United States, CanadaCraton, Deformation, tectonics
DS1985-0268
1985
Harris, J.M.Harris, J.M.Studies on Argyle DiamondsIndustrial Diamond Review., Vol. 45, No. 3, PP. 128-130.Australia, Western AustraliaMineralogy
DS1993-1306
1993
Harris, J.M.Richardson, S.H., Harris, J.M., Gurney, J.J.3 generations of diamonds from old continental mantleNature, Vol. 366, No. 6452, November 18, pp. 256-258.MantleDiamond, Genesis
DS1994-0719
1994
Harris, J.R.Harris, J.R., et al.Computer enhancement techniques for the integration of remotely sensedgeophysical, thematic dataCanadian Journal of Remote Sensing, Vol. 20, No. 3, Sept. pp. 210-221CanadaComputer techniques, Remote sensing -review
DS1999-0290
1999
Harris, J.R.Harris, J.R., Wilkinson, L.GIS methods in geochemical explorationAssocation of Exploration Geologists (AEG) 19th. Drift Exploration Glaciated, S.C., pp. 182-210.Northwest TerritoriesGeomorphology, glacial, geochemistry, Drift prospecting - mentions diamonds
DS2001-0450
2001
Harris, J.R.Harris, J.R., Eddy, B., Rencz, A., De Kemp, et al.Remote sensing as a geological mapping took in the Arctic: preliminary results from Baffin Island.Can. Geological Survey Current Research, No. 2001-E12, 22p.Northwest Territories, Nunavut, Baffin IslandRemote sensing
DS2003-0557
2003
Harris, J.R.Harris, J.R., Bonham-Carter, G.F.A method of detecting glacial dispersal trains in till geochemical dataGeochemistry, Vol. 3, 2, pp. 133-156.OntarioGeochemistry - Kapuskasing structure, Not specific to diamonds
DS2003-0558
2003
Harris, J.R.Harris, J.R., Rogge, D., Hitchcock, R., Ijewliw, O., Wright, D.Mapping lithology in Canada's high arctic: application of hyper spectral Data31st Yellowknife Geoscience Forum, p. 37. (abst.Nunavut, Baffin IslandRemote sensing - hyperspectral
DS200412-0795
2003
Harris, J.R.Harris, J.R., Bonham-Carter, G.F.A method of detecting glacial dispersal trains in till geochemical data.Geochemistry, Vol. 3, 2, pp. 133-156.Canada, OntarioGeochemistry - Kapuskasing structure Not specific to diamonds
DS200412-0796
2003
Harris, J.R.Harris, J.R., Rogge, D., Hitchcock, R., Ijewliw, O., Wright, D.Mapping lithology in Canada's high arctic: application of hyper spectral Data.31st Yellowknife Geoscience Forum, p. 37. (abst.Canada, Nunavut, Baffin IslandRemote sensing - hyperspectral
DS200412-0797
2004
Harris, J.R.Harris, J.R., Vijoen, D., Bonham-Carter, G.F., Brown, N.Dispersal train identification algorthim (DTIA).Geological Survey of Canada, Open File 4672, 1 CD $ 20.00TechnologyComputer - geochemistry .. not specific to diamonds
DS200512-0405
2005
Harris, J.R.Harris, J.R., Ponomarev, P., Shang, J.A comparison of methods for extracting end members from airborne hyper spectral data: application to geologic mapping in Canada's Arctic.GAC Annual Meeting Halifax May 15-19, Abstract 1p.Canada, Nunavut, Northwest TerritoriesRemote sensing
DS200612-0536
2006
Harris, J.R.Harris, J.R., Ponomarev, P., Shang, S., Budkewitsch, P., Rogge, D.A comparison of automatic and supervised methods for extracting lithological end members from hyper spectral data: application to southern Baffin Island, Nunavut.Geological Survey of Canada Current Research, 2006-C4 19p.Canada, NunavutHyperspectral - technology
DS200612-0537
2005
Harris, J.R.Harris, J.R., Rogge, D., Hitchcock, R., Ijewliw, O., Wright, D.Mapping lithology in Canada's Arctic: application of hyper spectral dat a using the minimum noise fraction transformation and matched filtering.Canadian Journal of Earth Sciences, Vol. 41, 12, Dec. pp. 2173-2193.Canada, Nunavut, Baffin IslandMapping - hyperspectral, lithology
DS201511-1841
2015
Harris, J.R.Harris, J.R., Grunsky, E., Behnia, P., Corrigan, D.Dat a and knowledge-driven mineral prospectivity maps for Canada's north. (**note for Au )Ore Geology Reviews, Vol. 71, pp. 788-803.Canada, Nunavut, Melville PeninsulaGIS. IAS

Abstract: Data- and knowledge-driven techniques are used to produce regional Au prospectivity maps of a portion of Melville Peninsula, Northern Canada using geophysical and geochemical data. These basic datasets typically exist for large portions of Canada's North and are suitable for a "greenfields" exploration programme. The data-driven method involves the use of the Random Forest (RF) supervised classifier, a relatively new technique that has recently been applied to mineral potential modelling while the knowledge-driven technique makes use of weighted-index overlay, commonly used in GIS spatial modelling studies. We use the location of known Au occurrences to train the RF classifier and calculate the signature of Au occurrences as a group from non-occurrences using the basic geoscience dataset. The RF classification outperformed the knowledge-based model with respect to prediction of the known Au occurrences. The geochemical data in general were more predictive of the known Au occurrences than the geophysical data. A data-driven approach such as RF for the production of regional Au prospectivity maps is recommended provided that a sufficient number of training areas (known Au occurrences) exist.
DS202102-0176
2021
Harris, J.WBrenker, F.E., Nestola, F., Brenker, L., Peruzo, L., Harris, J.WOrigin, properties, and structure of breyite: the second most abundant mineral inclusion in super-deep diamonds.The American Mineralogist, Vol. 106, pp. 38-43. pdfMantleperovskites, mineral inclusions

Abstract: Earth's lower mantle most likely mainly consists of ferropericlase, bridgmanite, and a CaSiO3- phase in the perovskite structure. If separately trapped in diamonds, these phases can be transported to Earth's surface without reacting with the surrounding mantle. Although all inclusions will remain chemically pristine, only ferropericlase will stay in its original crystal structure, whereas in almost all cases bridgmanite and CaSiO3-perovskite will transform to their lower-pressure polymorphs. In the case of perovskite structured CaSiO3, the new structure that is formed is closely related to that of walstromite. This mineral is now approved by the IMA commission on new minerals and named breyite. The crystal structure is triclinic (space group: P1) with lattice parameters a0 = 6.6970(4) Å, b0 = 9.2986(7) Å, c0 = 6.6501(4) Å, ? = 83.458(6)°, ? = 76.226(6)°, ? = 69.581(7)°, and V = 376.72(4) Å. The major element composition found for the studied breyite is Ca3.01(2)Si2.98(2)O9. Breyite is the second most abundant mineral inclusion after ferropericlase in diamonds of super-deep origin. The occurrence of breyite has been widely presumed to be a strong indication of lower mantle (=670 km depth) or at least lower transition zone (=520 km depth) origin of both the host diamond and the inclusion suite. In this work, we demonstrate through different formation scenarios that the finding of breyite alone in a diamond is not a reliable indicator of the formation depth in the transition zone or in the lower mantle and that accompanying paragenetic phases such as ferropericlase together with MgSiO3 are needed.
DS1960-0959
1968
Harris, J.W.Harris, J.W.The Recognition of Diamond Inclusions. Part I. Syngenetic Mineral Inclusions. Part Ii. Epigenetic Mineral Inclusions.Industrial Diamond Review., PP. 402-410; PP. 458-561.GlobalDiamond Morphology
DS1960-1122
1969
Harris, J.W.Harris, J.W.Mineral Inclusions in Diamond and Their Geological Significance.Ph.d. Thesis University London., 250P.GlobalMineralogy
DS1960-1123
1969
Harris, J.W.Harris, J.W.Syngenetic Mineral Inclusions in Diamond As Identified by X-ray Analysis.Journal of Gemology, Vol. 11, No. 7, PP. 256-262.Sierra Leone, West AfricaProbe, Mineralogy
DS1970-0089
1970
Harris, J.W.Harris, J.W., Milledge, H.J., Barron, T.H.K.Thermal Expansion of Garnets Included in DiamondJournal of Geophysical Research, Vol. 75, No. 2, PP. 5775-5792.South AfricaInclusions, Probe
DS1970-0522
1972
Harris, J.W.Harris, J.W.Black Material on Mineral Inclusions and in Internal Fracture Planes in Diamond.Contributions to Mineralogy and Petrology, Vol. 35, No. 1, PP. 22-33.Sierra Leone, West AfricaMineralogy
DS1970-0523
1972
Harris, J.W.Harris, J.W., Vance, E.R.Induced Graphitization Around Crystalline Inclusions in DiamondContributions to Mineralogy and Petrology, Vol. 35, pp. 227-34.South Africa, West Africa, Sierra Leone, GhanaPetrology, Deposit - Premier, Finsch, Jagersfontein
DS1970-0525
1972
Harris, J.W.Hawthorne, J.B., Harris, J.W., Gurney, J.J., Rickard, R.Inclusions in Diamonds from Southern AfricaPreprint, 21p.South AfricaDiamond Inclusions, Deposit - Premier, Finsch, Koffiefontein
DS1970-0707
1973
Harris, J.W.Harris, J.W.Observations on Letseng la Terae DiamondsMaseru: Lesotho Nat. Dev. Corp. Lesotho Kimberlites Editor N, PP. 37-38.LesothoMineralogy, Morphology, Colour
DS1970-0708
1973
Harris, J.W.Harris, J.W., Hawthorne, J.B., Oosterveld, M.M., Weymeyer, E.Regularities in the Characteristics of South African Kimberlites.1st International Kimberlite Conference, EXTENDED ABSTRACT VOLUME, PP. 151-154.South AfricaClassification
DS1970-0841
1973
Harris, J.W.Vance, E.R., Harris, J.W., Milledge, H.J.Possible Origins of Alpha Damage in Diamonds from Kimberlite and Alluvial Sources.Mineralogical Magazine., Vol. 39, No. 303, PP. 349-360.South AfricaFinsch, Bellsbank, Premier, De Beers
DS1970-0923
1974
Harris, J.W.Harris, J.W., Vance, E.R.Studies of the Reaction Between Diamond and Heated KimberlitContributions to Mineralogy and Petrology, Vol. 47, No. 4, PP. 231-244.South AfricaMineral Chemistry, Petrology
DS1975-0096
1975
Harris, J.W.Harris, J.W., Hawthorne, J.B., Oosterveld, M.M., Wehmeyer, E.A Classification Scheme for Diamond and a Comparative Studyof South African Diamond Characteristics.Physics and Chemistry of the Earth., Vol. 9, PP. 765-783.South AfricaDiamond Genesis
DS1975-0520
1977
Harris, J.W.Harris, J.W.The Relative Abundance of Inclusions in Diamonds and Their Relationship to Diamond Morphology.Diamond Conference Held Reading, ABSTRACT VOLUME.South AfricaDiamond Genesis
DS1975-1044
1979
Harris, J.W.Gurney, J.J., Harris, J.W., Rickard, R.S.Silicate and Oxide Inclusions in Diamond from the Finsch Kimberlite Pipe.Proceedings of Second International Kimberlite Conference, Proceedings Vol. 1, PP. 1-15.South AfricaMineralogy
DS1975-1052
1979
Harris, J.W.Harris, J.W.Inclusions in Diamonds #2In: Properties of Diamond, Field, J.e. Editor, Academic Pres, PP. 555-591.GlobalDiamond Morphology, Natural
DS1975-1053
1979
Harris, J.W.Harris, J.W.Physical and Chemical Constraints on the Formation of Natural Diamond in the Upper Mantle.International DIAMOND RESEARCH, PP. 2-6.South AfricaPremier, Jagersfontein, Koffiefontein, Diamond, Morphology, Genesis
DS1975-1054
1979
Harris, J.W.Harris, J.W., Hawthorne, J.B., Oosterveld, M.M.Regional and Local Variations in the Characteristics of Diamonds from Some Southern African Kimberlites.Proceedings of Second International Kimberlite Conference, Vol. 1, PP. 27-41.Botswana, South AfricaKimberlite, Crystallography, Genesis
DS1980-0162
1980
Harris, J.W.Harte, B., Gurney, J.J., Harris, J.W.The Formation of Peridotitic Suite Inclusions in DiamondsContributions to Mineralogy and Petrology, Vol. 72, pp. 181-90.South Africa, TanzaniaPeridotite, Diamond Inclusions
DS1982-0162
1982
Harris, J.W.Danchin, R.V., Harris, J.W., Scott smith, B.H., Stracke, K.J.Diamondiferous Kimberlites at Orroroo, South AustraliaProceedings of Third International Kimberlite Conference, TERRA COGNITA, ABSTRACT VOLUME., Vol. 2, No. 3, P. 205, (abstract.).AustraliaKimberlite, Phlogophite, Chemistry, Mineralogy, Heavy Minerals
DS1982-0231
1982
Harris, J.W.Gurney, J.J., Harris, J.W.Some Observations Relevant to the Formation of Natural Diamonds.Proceedings of Third International Kimberlite Conference, TERRA COGNITA, ABSTRACT VOLUME., Vol. 2, No. 3, P. 199, (abstract.).GlobalMorphology, Chemistry, Peridotite, Xenolith
DS1982-0232
1982
Harris, J.W.Gurney, J.J., Harris, J.W.Some Observations on the Formation of Natural DiamondUnknown, 35P.South AfricaFinsch, Koffiefontein, Orapa, Roberts Victor, Premier, Inclusion
DS1982-0233
1982
Harris, J.W.Gurney, J.J., Harris, J.W., Richard, R.S.Silicate and Oxide Inclusions in Diamonds from Orapa Mine, Botswana.Proceedings of Third International Kimberlite Conference, TERRA COGNITA, ABSTRACT VOLUME., Vol. 2, No. 3, P. 201, (abstract.).BotswanaKimberlite, Garnet, Eclogite, Websterite
DS1982-0234
1982
Harris, J.W.Gurney, J.J., Harris, J.W., Rickard, R.S.The Abundance and Chemistry of Minerals Associated with Diamonds at Roberts Victor Mine.Proceedings of Third International Kimberlite Conference, TERRA COGNITA, ABSTRACT VOLUME., Vol. 2, No. 3, P. 200, (abstract.).South AfricaKimberlite, Chemistry, Olivine, Harzburgite, Garnet, Eclogite
DS1982-0251
1982
Harris, J.W.Harris, J.W.Are These Diamonds from Orapa or Brasil?Indiaqua., No. 32, 1982/II, PP. 35-38.Brazil, South AfricaClassification
DS1982-0252
1982
Harris, J.W.Harris, J.W., Gurney, J.J.The Abundance, Mineralogy and Chemistry of Sulphide Inclusions in Diamonds.Proceedings of Third International Kimberlite Conference, TERRA COGNITA, ABSTRACT VOLUME., Vol. 2, No. 3, P. 201, (abstract.).South AfricaKimberlite, Premier, Finsch, Jagersfontein, Orapa, Roberts Victor
DS1982-0253
1982
Harris, J.W.Harris, J.W., Hawthorne, J.B., Oosterveld, M.M.Diamond Characteristics of the de Beers Pool Mines, Kimberley, South Africa.Proceedings of Third International Kimberlite Conference, TERRA COGNITA, ABSTRACT VOLUME., Vol. 2, No. 3, P. 200, (abstract.).South AfricaKimberlite, Bultfontein, Dutoitspan, Wesselton Physical
DS1982-0550
1982
Harris, J.W.Scott smith, B., Danchin, R.V., Harris, J.W., Stracke, K.J.Kimberlite Near Orroroo, South AustraliaStockdale Prospecting Ltd., 32P.Australia, South AustraliaKimberlite, Diamonds, Prospecting
DS1982-0551
1982
Harris, J.W.Scott smith, B.H., Danchin, R.V., Harris, J.W., Stracke, K.J.Kimberlite Near Orroroo South AustraliaSouth Australia Open File...proceedings of Third International Kimberlite Conference., PAPER GIVEN FROM OPEN FILE E3891, 32P. 1 MAP. UNPUBL.Australia, South AustraliaDiamonds, Petrology, Heavy Minerals, Geochemistry, Geochronology
DS1983-0196
1983
Harris, J.W.Deines, P., Gurney, J.J., Harris, J.W.Associated Chemical and Carbon Isotopic Composition Variations in Diamonds from the Finsch and Premier Kimberlite, South Africa. #1Reprint., 46P. 9FIG.South AfricaGenesis, Diamonds, Kimberlite, Inclusions, Mineral Chemistry
DS1983-0283
1983
Harris, J.W.Harris, J.W., Hawthorne, J.B., Oosterveld, M.M.A Comparison of Diamond Characteristics from the de Beers Pool Mines, Kimberley, South Africa.Annales Scientifiques De L' Universite De Clermont-ferrand Ii, No. 74, PP. 1-14.South AfricaDiamond Morphology
DS1983-0562
1983
Harris, J.W.Scott smith, B.H., Danchin, R.V., Harris, J.W., Stracke, K.J.Kimberlites Near Orroroo South Australia: AppendixAnnales Scientifiques De L' Universite De Clermont-ferrand Ii, No. 74, PP. 123-126.Australia, South AustraliaAnalyses, Mineral Chemistry
DS1984-0190
1984
Harris, J.W.Clement, C.R., Harris, J.W., Robinson, D.N., Hawthorne, J.B.The de Beers Kimberlite Pipe - a Historic South African Diamond Mine.Geological Society of South Africa, South AfricaHistory, Geology, Mining Recovery, Diamonds
DS1984-0227
1984
Harris, J.W.Deines, P., Gurney, J.J., Harris, J.W.Associated Chemical and Carbon Isotopic Composition Variations in Diamonds from the Finsch and Premier Kimberlite, South Africa. #2Geochimica Et Cosmochimica Acta, Vol. 48, No. 2, FEBRUARY, PP. 325-342.South AfricaMineral Chemistry, Isotope, Chronology
DS1984-0328
1984
Harris, J.W.Gurney, J.J., Harris, J.W., Rickard, R.S.Silicate and Oxide Inclusions in Diamonds from the Orapa Mine, Botswana.Proceedings of Third International Kimberlite Conference., Vol. 2, PP. 3-9.BotswanaAnalyses, Geothermometry, Geobarometry, Mineral Chemistry
DS1984-0329
1984
Harris, J.W.Gurney, J.J., Harris, J.W., Rickard, R.S.Minerals Associated With Diamonds from the Roberts Victor MineProceedings of Third International Kimberlite Conference, Vol. 2, PP. 25-32.South AfricaAnalyses, Isotope, Mineral Chemistry
DS1984-0607
1984
Harris, J.W.Richardson, S.H., Gurney, J.J., Erlank, A.J., Harris, J.W.Origin of Diamonds in Old Enriched MantleNature., Vol. 310, No. 5974, JULY 19TH. PP. 198-202.South AfricaBultfontein, Finsch, Kimberley, Geochronology, Genesis
DS1984-0640
1984
Harris, J.W.Scott smith, B.H., Danchin, R.V., Harris, J.W., Stracke, K.J.Kimberlites Near Orroroo, South AustraliaProceedings of Third International Kimberlite Conference, Vol. 1, PP. 121-142.Australia, South AustraliaPetrography, Mineralogy, Geochemistry
DS1985-0254
1985
Harris, J.W.Gurney, J.J., Harris, J.W., Rickard, . R.S., Moore, R.O.Inclusions in Premier Mine DiamondsTransactions Geological Society of South Africa, Vol. 88, pt. 2, May-August pp. 301-310South AfricaMineralogy, Geothermometry
DS1985-0269
1985
Harris, J.W.Harris, J.W., Collins, A.T.Studies of Argyle DiamondsIndustrial Diamond Review, Vol. 45, No. 508, pp. 128-130AustraliaDiamond Morphology
DS1986-0143
1986
Harris, J.W.Clement, C.R., Harris, J.W., Hawthorne, J.B.The De Beers kimberlite pipe- a historic south African diamond mineMineral Deposits of Southern Africa, Vol. 2, pp. 2193-2214South AfricaHistory
DS1986-0178
1986
Harris, J.W.Deines, P., Harris, J.W., Gurney, J.J.On the existence of C-13 depleted carbon in the mantle, evidence From diamond studiesProceedings of the Fourth International Kimberlite Conference, Held Perth, Australia, No. 16, pp. 383-385South AfricaRoberts Victor, Diamond morphology
DS1986-0227
1986
Harris, J.W.Evans, T., Harris, J.W.Nitrogen aggregation, inclusion equilibration temperatures And the age Of diamonds #1Proceedings of the Fourth International Kimberlite Conference, Held, No. 16, pp. 386-388South AfricaRoberts Victor, Finsch, Diamond morphology
DS1986-0323
1986
Harris, J.W.Gurney, J.J., Harris, J.W., Rickard, R.S., Cardoso, P.Mineral inclusions in diamonds from Koffiefontein mineProceedings of the Fourth International Kimberlite Conference, Held Perth, Australia, No. 16, pp. 389-391South AfricaKoffiefontein, Diamond morphology
DS1986-0341
1986
Harris, J.W.Harris, J.W., Hawthorne, J.B., Oosterveld, M.M.A comparison of characteristics of diamonds from Orapa and Jwaneng kimberlite pipes in BotswanaProceedings of the Fourth International Kimberlite Conference, Held Perth, Australia, No. 16, pp. 395-397BotswanaDiamond morphology
DS1986-0342
1986
Harris, J.W.Harris, J.W., Spear, P.M.Systematic studies of nitrogen in diamonds from known sourcesProceedings of the Fourth International Kimberlite Conference, Held Perth, Australia, No. 16, pp. 398-400South Africa, Botswana, AustraliaDiamond morphology
DS1986-0581
1986
Harris, J.W.Moore, R.O., Otter, M.L., Rickard, R.S., Harris, J.W., Gurney, J.J.The occurrence of moissanite and ferro-periclase as inclusionsindiamondProceedings of the Fourth International Kimberlite Conference, Held Perth, Australia, No. 16, pp. 409-411South Africa, ColoradoMonastery, Sloan, Diamond morphology
DS1986-0753
1986
Harris, J.W.Smith, C.B., Gurney, J.J., Harris, J.W., Robinson, D.N., Shee, S.R.Strontium and neodymium isotopic systematics of diamond bearing eclogite xenoliths and eclogitic inclusions in diamond from southernAfricaProceedings of the Fourth International Kimberlite Conference, Held, No. 16, pp. 332-334South AfricaEclogite
DS1987-0145
1987
Harris, J.W.Deines, P., Harris, J.W.C13 and O18 and nitrogen content studies of graphite and diamond Eclogites and Orapa ,BotswanaGeological Society of America, Vol. 19, No. 7 annual meeting abstracts, p.639. abstracBotswanaOrapa, Isotope
DS1987-0146
1987
Harris, J.W.Deines, P., Harris, J.W., Gurney, J.J.Carbon isotope composition, nitrogen content and inclusion composition Of diamonds from the Roberts Victor kimberlite, South Africa- evidence for C 13depletion in tGeochem. Cosmochem.Acta, Vol. 51, No. 5, May pp. 1227-1243South AfricaRoberts Victor, Isotope
DS1987-0276
1987
Harris, J.W.Harris, J.W.Recent physical, chemical and isotopic research of diamondin: Nixon, P.H. ed. Mantle xenoliths, J. Wiley, pp. 477-500Globalp. 494-5 Alkali element abundances, p. 498 diamond age deterM.
DS1989-0192
1989
Harris, J.W.Burgess, R., Turner, G., Laurenzi, M., Harris, J.W.40Ar 39Ar laser probe dating of individual clinopyroxene inclusions in Premier eclogitic diamondsEarth and Planetary Science Letters, Vol. 94, No.l 1/2, August pp. 22-28South AfricaGeochronology, Diamond Inclusions
DS1989-0349
1989
Harris, J.W.Deines, P., Harris, J.W., Spear, P.M., Gurney, J.J.Nitrogen and C-13 content of Finsch and Premier diamonds and theirimplicationsGeochimica et Cosmochimica Acta, Vol. 53, No. 6, June pp. 1367-1378South AfricaDiamond morphology, Diamond inclusions
DS1989-0413
1989
Harris, J.W.Evans, T., Harris, J.W.Nitrogen aggregation, inclusion equilibration temperatures and the age Of diamonds #2Geological Society of Australia Inc. Blackwell Scientific Publishing, No. 14, Vol. 2, pp. 1001-1006GlobalDiamond inclusions, Roberts Victor, Finsch, Nitrogen
DS1989-0593
1989
Harris, J.W.Harris, J.W.Variations in the physical and chemical properties of natural diamondDiamond Workshop, International Geological Congress, July 15-16th. editors, pp. 29-31South Africa, BotswanaDiamond morphology, Natural diamond
DS1989-1209
1989
Harris, J.W.Philips, D., Onstott, T.C., Harris, J.W.40Ar/39Ar laser-probe dating of diamond inclusions from the PremierkimberliteNature, Vol. 30, No. 6233, August 10, pp. 460-462South AfricaDiamond morphology, Diamond inclusions
DS1989-1270
1989
Harris, J.W.Rickard, R.S., Harris, J.W., Gurney, J.J., Cardos, P.Mineral inclusions in diamonds from the Koffiefontein mineGeological Society of Australia Inc. Blackwell Scientific Publishing, Special, No. 14, Vol. 2, pp. 1054-1062South AfricaDiamond inclusions, Deposit -Koffiefontein
DS1989-1407
1989
Harris, J.W.Smith, C.B., Gurney, J.J., Harris, J.W., Otter, M.L., Kirkley, M.B.neodymium and Strontium isotope systematics of large eclogite and lherzolite paragenesis single diamonds,Finsch and Kimberley PoolDiamond Workshop, International Geological Congress, July 15-16th., pp. 102-104. AbstractSouth AfricaDiamond morphology, Eclogite, Geochronology
DS1989-1408
1989
Harris, J.W.Smith, C.B., Gurney, J.J., Harris, J.W., Robinson, D.N., Shee, S.R.Sm and neodymium isotopic systematics of diamond bearing eclogite xenoliths and eclogitic inclusions in diamond from southern AfricaGeological Society of Australia Inc. Blackwell Scientific Publishing, Special, No. 14, Vol. 2, pp. 853-863South AfricaDiamond inclusions, Diamond eclogite
DS1989-1625
1989
Harris, J.W.Wilding, M.C., Harte, B., Harris, J.W.Evidence of asthenospheric source for diamonds from Brasil28th. International Geological Congress, Held Washington Dc., Vol. 3, pp. 359-360. AbstractBrazilMantle, Diamond genesis
DS1990-1225
1990
Harris, J.W.Richardson, S.H., Erlank, A.J., Harris, J.W., Hart, S.R.Eclogitic diamonds of Proterozoic age from Cretaceous kimberlitesNature, Vol. 346, No. 6279, July 5, pp. 54-56South Africa, BotswanaGeochronology, Eclogitic diamonds
DS1991-0363
1991
Harris, J.W.Deines, P., Harris, J.W., Gurney, J.J.The carbon isotopic composition and nitrogen content of lithospheric and asthenospheric diamonds from the Jagersfontein kimberlite, South AfricaGeochimica et Cosmochimica Acta, Vol. 55, pp. 2615-2625South AfricaGeochronology, CI, Nitrogen, Jagersfontein
DS1991-0364
1991
Harris, J.W.Deines, P., Harris, J.W., Robinson, D.N., Gurney, J.J., Shee, S.R.Carbon and isotope oxygen variations in diamond and graphite eclogites fromOrapa, Botswana and the nitrogen content of their diamondsGeochimica et Cosmochimica Acta, Vol. 55, No. 2, February pp. 515-524BotswanaEclogites, Geochronology, isotopes
DS1991-0434
1991
Harris, J.W.Eldridge, C.S., Compston, W., Williams, I.S., Harris, J.W., BristowIsotope evidence for the involvement of recycled sediments in diamondformationNature, Vol. 353, Oct. 17, pp. 649-653GlobalGeochronology - isotopes, Diamond genesis
DS1991-0675
1991
Harris, J.W.Harris, J.W., Duncan, D.J., Zhang, F., Mia, Q., Zhu, Y.The physical characteristics and syngenetic inclusion geochemistry Of diamonds from Pipe 50, Liaoning Province, People's Republic of Chin a #1Proceedings of Fifth International Kimberlite Conference held Araxa June, pp. 160-162ChinaDiamond morphology, Peridotite, Diamond inclusions
DS1991-1274
1991
Harris, J.W.Otter, M.L., Gemeke, D.A., Harte, B., Gurney, J.J., Harris, J.W.Diamond growth histories revealed by cathodluminescence and carbon isotopestudiesProceedings of Fifth International Kimberlite Conference held Araxa June 1991, Servico Geologico do Brasil (CPRM) Special, pp. 318-319Southern AfricaPremier, Bultfontein, Finsch, Koffiefontein, Geochronology
DS1991-1422
1991
Harris, J.W.Rickard, R.S., Gurney, J.J., Harris, J.W.Mineral inclusions in diamonds from Jagersfontein mineProceedings of Fifth International Kimberlite Conference held Araxa June 1991, Servico Geologico do Brasil (CPRM) Special, pp. 336-338South AfricaDiamond inclusions, Peridotite, mineral chemistry, analyses
DS1991-1607
1991
Harris, J.W.Smith, C.B., Gurney, J.J., Harris, J.W., Otter, M.L., Kirkley, M.B.Neodynium and strontium isotope systematics of eclogite and websterite paragenesis inclusions from single diamonds, Finsch and Kimberley Pool, RSA.Geochimica et Cosmochimica Acta, Vol. 55, pp. 2579-2590South AfricaGeochronology, Eclogite, websterite, diamond morphology
DS1991-1856
1991
Harris, J.W.Wilding, M.C., Harte, B., Harris, J.W.Evidence for a deep origin for Sao Luiz diamondsProceedings of Fifth International Kimberlite Conference held Araxa June 1991, Servico Geologico do Brasil (CPRM) Special, pp. 456-458BrazilMato Grosso, Diamond inclusions, Microprobe
DS1991-1857
1991
Harris, J.W.Wilding, M.C., Harte, B., Harris, J.W.Inclusion chemistry, carbon isotopes and nitrogen distribution in Bultfontein diamondsProceedings of Fifth International Kimberlite Conference held Araxa June 1991, Servico Geologico do Brasil (CPRM) Special, p. 459South AfricaDiamond inclusions, Geochronology
DS1992-0189
1992
Harris, J.W.Burgess, R., Turner, G., Harris, J.W.40Ar 39 Ar laser probe studies of clinopyroxene inclusions in eclogiticdiamondsGeochimica et Cosmochimica Acta, Vol. 56, pp. 389-402GlobalGeochronology, eclogitic diamonds, Argon, Orapa, Jwaneng, Argyle, Udachnaya
DS1992-0636
1992
Harris, J.W.Gurney, J.J., Harris, J.W.The Kalahari craton: Clifford's rule reflects diamond's ancient originsRussian Geology and Geophysics, Vol. 33, No. 10, pp. 32-34South AfricaCraton, Diamond inclusions
DS1993-0337
1993
Harris, J.W.Deines, P., Harris, J.W., Gurney, J.J.Depth related carbon isotope and nitrogen concentration variability in The mantle below the Orapa kimberlite, Botswana, AfricaGeochemica et Cosmochimica Acta, Vol. 57, No. 12, June pp. 2781-2796BotswanaMantle, Deposit -Orapa
DS1993-0398
1993
Harris, J.W.Eggler, D.H., Harris, J.W., Sobolev, N.V.Oxidation state of eclogitic diamond sulfide inclusionsGeological Society of America Annual Abstract Volume, Vol. 25, No. 6, p. A99 abstract onlySouthern AfricaEclogite, Diamond inclusions
DS1993-0632
1993
Harris, J.W.Harris, J.W.The geology of diamond - time and depth profiles from inclusionsDiamond Relat, Vol. 2, No. 2-4, March 31, pp. 70-74GlobalDiamond inclusions
DS1993-1397
1993
Harris, J.W.Schrauder, M., Harris, J.W.Carbonate and water bearing fluids trapped in an octahedral, peridotitediamond.American Geophysical Union, EOS, supplement Abstract Volume, October, Vol. 74, No. 43, October 26, abstract p. 636.Russia, SiberiaDiamond morphology, Deposit -Udachnaya
DS1994-0417
1994
Harris, J.W.Deines, P., Harris, J.W.On the importance of fluids for diamond growthMineralogical Magazine, Vol. 58A, pp. 219-220. AbstractSouth AfricaGeochemistry, Sulphide inclusions
DS1994-0720
1994
Harris, J.W.Harris, J.W.Pyrope-almandine garnet in lower mantle mineral paragenesis from Sao @Brasil.Eos, Vol. 75, No. 16, April 19, p. 192.BrazilMantle mineralogy, Deposit -Sao Luiz area
DS1994-0721
1994
Harris, J.W.Harris, J.W., Duncan, D.J., Zhang F., Mia Q, Zhu Y.The physical characteristics and syngenetic inclusion geochemistry Of diamonds from Pipe 50, Lianoning Province #2Proceedings of Fifth International Kimberlite Conference, Vol. 2, pp. 106-115.ChinaDiamond morphology, Geochemistry
DS1994-0729
1994
Harris, J.W.Harte, B., Harris, J.W.Lower mantle mineral associations preserved in diamondsMineralogical Magazine, Vol. 58A, pp. 384-385. AbstractBrazilMineral associations, Mantle -lower and upper
DS1994-0730
1994
Harris, J.W.Harte, B., Hutchison, M.T., Harris, J.W.Trace element characteristics of the lwoer mantle: ion probe inclusions Of diamonds from Sao Luiz, Brasil.Mineralogical Magazine, Vol. 58A, pp. 386-387. AbstractBrazilGeochronology, alluvials, Deposit -Sao Luiz
DS1994-0731
1994
Harris, J.W.Harte, B., Hutchison, M.T., Harris, J.W.Trace element characteristics of the lower mantle: an ion probe study of inclusions in diamonds from San LuizMineralogical Magazine, Vol. 58A, pp. 386-387. AbstractBrazilGeochronology, Diamond morphology
DS1994-1060
1994
Harris, J.W.Lowry, D., Mattey, D.P., Macpherson, C.G., Harris, J.W.Evidence for stable isotope and chemical disequilibrium associated with diamond formation in the mantle.Mineralogical Magazine, Vol. 58A, pp. 535-536. AbstractMantleGeochronology, Diamond genesis
DS1994-1890
1994
Harris, J.W.Watt, G.R., Harris, J.W., Harte, B., Boyd, S.R.A high chromium corundum ruby inclusion in diamond from the Sao Luizalluvial mine, Brasil.Mineralogical Magazine, Vol. 58, No. 392, Sept. 490-493.BrazilDiamond inclusion
DS1994-1915
1994
Harris, J.W.Wilding, M.C., Harte, B., Fallick, A.E., Harris, J.W.Inclusion chemistry, carbon isotopes and nitrogen distribution in Diamonds from the Bultfontein mine.Proceedings of Fifth International Kimberlite Conference, Vol. 2, pp. 116-126.South AfricaMineral chemistry, Deposit -Bultfontein
DS1995-0410
1995
Harris, J.W.Deines, P., Harris, J.W.Sulfide inclusion chemistry and carbon isotopes of African diamondsGeochimica et Cosmochimica Acta, Vol. 59, No. 15, Aug, pp. 3173-3188.South AfricaGeochemistry, Diamond inclusions -sulphides
DS1995-0703
1995
Harris, J.W.Gurney, J.J., Harris, J.W., Otter, M.L., Rickard, R.S.Jwaneng diamond inclusionsProceedings of the Sixth International Kimberlite Conference Extended Abstracts, p. 208-10.BotswanaDiamond inclusions, Deposit -Jwaneng
DS1995-0834
1995
Harris, J.W.Hutchison, M.T., Harte, B., Harris, J.W., Fitzsimmons, I.Inferences on the exhumation history of lower mantle inclusions indiamonds.Proceedings of the Sixth International Kimberlite Conference Abstracts, pp. 242-244.BrazilGeochronology, Diamond inclusions, Sao Luiz
DS1995-1494
1995
Harris, J.W.Phillips, D., Harris, J.W.Geothermobarometry of diamond inclusions from the de Beers Pool Mines, Kimberley, South Africa.Proceedings of the Sixth International Kimberlite Conference Abstracts, pp. 441-442.South AfricaGeothermbarometry, Deposit -De Beers Pool Mines
DS1995-1817
1995
Harris, J.W.Stachel, T., Harris, J.W., Cartigny, P.Diamonds and their syngenetic mineral inclusions from the 2 Ga Birimiandeposits, Ghana, West Africa.Proceedings of the Sixth International Kimberlite Conference Abstracts, pp. 578-580.GhanaDiamond inclusions, Birimian Supergroup
DS1997-0264
1997
Harris, J.W.Deines, P., Harris, J.W., Gurney, J.J.Carbon isotope ratios, nitrogen content and aggregation state, and inclusion chemistry of diamonds from JwanengGeochimica et Cosmochimica Acta, Vol. 61, No. 18, Sept. pp. 3993-4006.BotswanaMineralogy - diamond inclusions, Deposit - Jwaneng
DS1997-0956
1997
Harris, J.W.Richardson, S.H., Harris, J.W.Antiquity of peridotitic diamonds from the Siberian CratonEarth and Planetary Science Letters, Vol. 151, No. 3-4, Oct. 1, pp. 271-Russia, SiberiaGeochronology, Peridotitic diamonds
DS1997-1096
1997
Harris, J.W.Stachel, T., Harris, J.W.Syngenetic inclusions in diamond from the Birim Field, (Ghana) a deepContributions to Mineralogy and Petrology, Vol. 127, No. 4, pp. 336-352.GhanaDiamond inclusions, Deposit - Birim field
DS1997-1097
1997
Harris, J.W.Stachel, T., Harris, J.W.Diamond precipitation and mantle metasomatism - evidence from the trace element chemistry of silicate..Contributions to Mineralogy and Petrology, Vol. 129, pp. 143-154.Ghana, South AfricaDiamond inclusions - silicate, Deposit - Akwatia, Roberts Victor
DS1998-0188
1998
Harris, J.W.Burgess, R., Phillips, D., Harris, J.W., Robinson, D.N.Antarctic diamonds in south eastern Australia? Hints from 40 Ar-39AR laser probe dating of clinopyroxene..7th International Kimberlite Conference Abstract, pp. 119-121.Australia, AntarcticaAlluvials, Argon, Deposit - Copeton
DS1998-0221
1998
Harris, J.W.Cartigny, P., Harris, J.W., Javoy, M.Eclogitic, peridotitic, metamorphic diamonds and the problems of carbonrecycling.7th International Kimberlite Conference Abstract, pp. 141-143.BotswanaDiamond genesis, carbon, Deposit - Orapa
DS1998-0222
1998
Harris, J.W.Cartigny, P., Harris, J.W., Javoy, M.Eclogitic diamond formation at Jwaneng: no room for a recycled componentScience, Vol. 280, No. 5368, BotswanaEclogite - subduction, Deposit - Jwaneng
DS1998-0223
1998
Harris, J.W.Cartigny, P., Harris, J.W., Javoy, M.Subduction related diamonds? the evidence for a mantle derived origin from coupled delta 13C -15N determin...Chemical Geology, Vol. 147, No. 1-2, May 15, pp. 147-160.Mantle, BotswanaDiamond genesis - subduction, Deposit - Jwaneng, Orapa
DS1998-0587
1998
Harris, J.W.Harris, J.W.Diamonds in transition zone and lower mantleIma 17th. Abstract Vol., p. A12. abstractBrazilMajorite inclusions, Deposit - Sao Luiz
DS1998-0591
1998
Harris, J.W.Harte, B., Harris, J.W. , Hutchison, Watt, WildingMineral facies and source materials for lower mantle inclusions in Diamonds from Sao Luiz, Brasil.Mineralogical Magazine, Goldschmidt abstract, Vol. 62A, p. 575-6.BrazilMineralogy - diamond inclusions, Deposit - Aripuena, Sao Luiz
DS1998-0592
1998
Harris, J.W.Harte, B., Hutchison, M.T., Lee, M., Harris, J.W.Inclusions of (Mg, Fe) O in mantle diamonds7th International Kimberlite Conference Abstract, pp. 308-10.South Africa, Australia, Zimbabwe, Brazil, LesothoTrace elements, mineralogy, Deposit - Sao Luiz, magnesium, iron
DS1998-0650
1998
Harris, J.W.Hutchison, M.T., Cartigny, P., Harris, J.W.Carbon and nitrogen compositions and cathodluminescence characteristics of transition zone and lower mantle...7th International Kimberlite Conference Abstract, pp. 336-8.BrazilDiamond morphology, Deposit - Sao Luiz
DS1998-0976
1998
Harris, J.W.McDade, P., Harris, J.W.Syngenetic inclusion bearing diamonds from Letseng la Terai, Lesotho7th International Kimberlite Conference Abstract, pp. 561-3.LesothoDiamond inclusions, Deposit - Letseng
DS1998-1158
1998
Harris, J.W.Phillips, D., Harris, J.W., Kiviets, Burgess, Fourie40 Ar39 Laser probe analyses of clinopyroxene diamond inclusions from the Orapa and Mbuyi Miya Mines.7th. Kimberlite Conference abstract, pp. 687-9.GlobalGeochronology, diamond inclusions, Deposit - Orapa, Mbuyi Miya
DS1998-1234
1998
Harris, J.W.Richardson, S.H., Chinn, I.L., Harris, J.W.Age and origin of eclogitic diamonds from the Jwaneng kimberlite, Botswana.7th. Kimberlite Conference abstract, pp. 734-6.BotswanaGeochronology, geochemistry, Deposit - Jwaneng
DS1998-1285
1998
Harris, J.W.Sautter, V., Harte, B., Harris, J.W.Majorite destabilisation on decompression: constrains from natural sample son plume velocity.Mineralogical Magazine, Goldschmidt abstract, Vol. 62A, p. 1320-1.BrazilMajorites, Deposit - Sao Luiz
DS1998-1396
1998
Harris, J.W.Stachel, T., Harris, J.W., Brey, G.P.Rare and unusual mineral inclusions in diamonds from Mwadui, TanzaniaContributions to Mineralogy and Petrology, Vol. 132, No. 1, pp. 34-47.TanzaniaDiamond inclusions, Deposit - Mwadui
DS1998-1397
1998
Harris, J.W.Stachel, T., Harris, J.W., Brey, G.P.Inclusions in diamonds from Mwadui- chemical mush in the source7th International Kimberlite Conference Abstract, pp. 859-61.TanzaniaMineral inclusions, Deposit - Mwadui
DS1998-1398
1998
Harris, J.W.Stachel, T., Viljoen, K.S., Harris, J.W.Metasomatic processes in lherzolitic and harzburgitic domains of diamondiferous lithospheric mantle: rare earth elements (REE).Earth and Planetary Science Letters, Vol. 159, No. 1-2, June 15, pp. 1-12.MantleGarnets - xenoliths, Diamond inclusions
DS1998-1399
1998
Harris, J.W.Stachel, T., Viljoen, K.S., Harris, J.W., Brey, G.P.rare earth elements (REE) patterms of garnets from diamonds and Diamondiferous geochemical signatures7th International Kimberlite Conference Abstract, pp. 862-4.South Africa, GhanaDiamond source, Deposit - Roberts Victor, BiriM.
DS1998-1545
1998
Harris, J.W.Viljoen, K.S., Phillips, D., Harris, J.W., Robinson, D.Mineral inclusions in diamonds from the Venetia kimberlites, NorthernProvince, South Africa.7th International Kimberlite Conference Abstract, pp. 943-5.South AfricaDiamond morphology - garnet inclusions, Deposit - Venetia
DS1999-0424
1999
Harris, J.W.Lowry, D., Mattey, D.P., Harris, J.W.Oxygen isotope composition of syngenetic inclusions in diamond from The finsch mine, RSA.Geochimica et Cosmochimica Acta, Vol. 63, No. 11, 12, June 1, pp. 1825-36.South AfricaGeochronology, Deposit - Finsch
DS1999-0459
1999
Harris, J.W.McDade, P., Harris, J.W.Syngenetic inclusion bearing diamonds from Letseng la Terai Lesotho7th International Kimberlite Conference Nixon, Vol. 2, pp. 557-65.LesothoDiamond - inclusions, Deposit - Letseng la Terai
DS1999-0597
1999
Harris, J.W.Richardson, S.H., Chinn, I.L., Harris, J.W.Age and origin of eclogitic diamonds from the Jwaneng kimberlite, Botswana7th International Kimberlite Conference Nixon, Vol. 2, pp. 709-13.BotswanaGenesis, Deposit - Jwaneng
DS1999-0707
1999
Harris, J.W.Stachel, T., Harris, J.W., Brey, G.P.rare earth elements (REE) patterns of peridotitic and eclogitic inclusions in diamonds from Mwadui ( Tanzania).7th International Kimberlite Conference Nixon, Vol. 2, pp. 829-35.TanzaniaDiamond - inclusions, geochemistry, lherzolite garnet, Deposit - Mwadui
DS1999-0772
1999
Harris, J.W.Viljoen, K.S., Phillips, D., Harris, J.W., Robinson, D.Mineral inclusions in diamonds from the Venetia kimberlites, Northern Province, South Africa.7th International Kimberlite Conference Nixon, Vol. 2, pp. 888-95.South AfricaDiamond - inclusions, mineral chemistry, Deposit - Venetia
DS2000-0922
2000
Harris, J.W.Stachel, T., Brey, G.P., Harris, J.W.Kankan diamonds I. from the lithosphere down to the transition zoneContributions to Mineralogy and Petrology, Vol. 140, No. 1, pp. 1-15.GuineaDiamond genesis, Deposit - Kankan
DS2000-0923
2000
Harris, J.W.Stachel, T., Harris, J.W., Joswig, W.Kankan diamonds II. Lower mantle inclusion paragenesesContributions to Mineralogy and Petrology, Vol. 140, No. 1, pp. 16-27.GuineaDiamond genesis, Deposit - Kankan
DS2001-0161
2001
Harris, J.W.Cartigny, P., Harris, J.W., Javoy, M.Diamond genesis, mantle fractionations and mantle nitrogen content: a study of delta 13 C -N in diamondsEarth and Planetary Science Letters, Vol. 185, No. 1-2, Feb.15, pp.85-98.GlobalDiamond - genesis, morphology, nitrogen, ultra high pressure (UHP)
DS2001-0243
2001
Harris, J.W.Deines, P., Viljoen, F., Harris, J.W.Implications of the carbon isotope and mineral inclusion record for the formation of diamonds VenetiaGeochimica Et Cosmochimica Acta, Vol. 65, No. 5. Mar. 1, pp. 813-38.South AfricaMantle - underlying mobile belt, Deposit - Venetia
DS2001-0451
2001
Harris, J.W.Harris, J.W., Stachel, T., Cartigny, P.Diamond - the ultimate mantle mineralInstitute of Mining and Metallurgy (IMM) Transactions. Durham Meeting absts., Vol. 110, p. B45-6. abstractGlobalDiamond - genesis brief
DS2001-0754
2001
Harris, J.W.McDonald, I., Harris, J.W., Viljoen, K.S.Can the nickel copper platinum group elements (PGE) signatures of sulphide inclusions in diamond help to constrain diamond formation processes?Institute of Mining and Metallurgy (IMM) Transactions. Durham Meeting absts., Vol. 110, p. B46. abstractGlobalDiamond - inclusions, genesis
DS2001-0976
2001
Harris, J.W.Richardson, S.H., Shirey, S.B., Harris, J.W., CarlsonArchean subduction recorded by Re Os isotopes in eclogite sulphide -T inclusions in kimberley diamonds.Earth and Planetary Science Letters, Vol. 191, No. 3-4, pp. 257-66.South AfricaSubduction, geochronology, Deposit - Kimberley
DS2001-1121
2001
Harris, J.W.Stachel, T., Harris, J.W., Tappert, R.Inclusions in diamonds from the PAnd a kimberlite29th. Yellowknife Geoscience Forum, Nov. 21-23, abstract p. 80.Northwest TerritoriesDiamond - inclusions, Deposit - Panda
DS2001-1122
2001
Harris, J.W.Stachel, T., Harris, J.W., Tappert, R., Brey, G.P.Peridotitic inclusions in diamonds from the Slave and Kaapvaal cratons - afirst comparison.Slave-Kaapvaal Workshop, Sept. Ottawa, 4p. abstractNorthwest Territories, South AfricaDiamond - inclusions, Geochemistry - major and trace elements Panda
DS2002-0203
2002
Harris, J.W.Brenker, F.E., Stachel, T., Harris, J.W.Exhumation of lower mantle inclusions in diamond: ATEM investigation of retrograde phase transitions, reactionEarth and Planetary Science Letters, Vol.198,1-2,pp.1-9., Vol.198,1-2,pp.1-9.MantleMineralogy - diamond inclusions
DS2002-0204
2002
Harris, J.W.Brenker, F.E., Stachel, T., Harris, J.W.Exhumation of lower mantle inclusions in diamond: ATEM investigation of retrograde phase transitions, reactionEarth and Planetary Science Letters, Vol.198,1-2,pp.1-9., Vol.198,1-2,pp.1-9.MantleMineralogy - diamond inclusions
DS2002-0228
2002
Harris, J.W.Burgess, R., Lazelle, E., Turner, G., Harris, J.W.Constraints on the age and halogen composition of mantle fluids in Siberian coated diamonds.Earth and Planetary Science Letters, Vol.197,3-4,pp. 193-203.RussiaGeochronology, Deposit - Aikhal
DS2002-0259
2002
Harris, J.W.Cartigny, P., Harris, J.W., Javoy, M.New dat a from a new craton: N and C isotopes in diamonds from the PAnd a kimberlite, Canada.Eos, American Geophysical Union, Spring Abstract Volume, Vol.83,19, 1p.Northwest TerritoriesGeochronology, Deposit - Panda
DS2002-0370
2002
Harris, J.W.Deines, P., Harris, J.W.Geochemical characteristics of Southern African diamondsEos, American Geophysical Union, Spring Abstract Volume, Vol.83,19, 1p.South Africa, BotswanaGeochemistry - diamond
DS2002-0448
2002
Harris, J.W.Farquhar, J., Wing, B.A., McKeegan, K.D., Harris, J.W.Observation of mass independent sulphur isotope composition for sulphide inclusions from e type diamonds, Orapa kimberlite pipe.Eos, American Geophysical Union, Spring Abstract Volume, Vol.83,19, 1p.BotswanaGeochronology, diamond inclusions
DS2002-0449
2002
Harris, J.W.Farquhar, J., Wing, B.A., McKeegan, K.D., Harris, J.W.Mass independent sulfur of inclusions in diamond and sulfur recycling on early EarthScience, Vol. 299, 5602, Dec. 20, pp.MantleDiamond inclusions, Sulphur
DS2002-0660
2002
Harris, J.W.Harte, B., Harris, J.W., Wilding, M., Sautter, V., McCammon, C.Eclogite garnetite inclusions in diamonds from the Sao Luiz area, Brasil18th. International Mineralogical Association Sept. 1-6, Edinburgh, abstract p.74.BrazilGarnet mineralogy
DS2002-1465
2002
Harris, J.W.Shirey, S.B., Harris, J.W., Richardson, S.H., Fuch, M.J., James, D.E., CartignyDiamond genesis, seismic structure and evolution of the Kaapvaal Zimbabwe CratonScience, No. 5587, Sept. 6, pp. 1683-5.South Africa, ZimbabweTectonics - diamond genesis, Geophysics - seismics
DS2002-1537
2002
Harris, J.W.Stachel, T., Harris, J.W., McCammon, C.Inclusions in ultra deep diamonds - tracers of ancient slabs?18th. International Mineralogical Association Sept. 1-6, Edinburgh, abstract p.74.MantleUHP mineralogy
DS2002-1538
2002
Harris, J.W.Stachel, T., Tappert, R., Harris, J.W.PAnd a diamonds: a window into the deep lithosphere beneath the central SlaveGac/mac Annual Meeting, Saskatoon, Abstract Volume, P.112., p.112.Northwest TerritoriesGeochronology, Diamond - inclusions
DS2002-1539
2002
Harris, J.W.Stachel, T., Tappert, R., Harris, J.W.PAnd a diamonds: a window into the deep lithosphere beneath the central SlaveGac/mac Annual Meeting, Saskatoon, Abstract Volume, P.112., p.112.Northwest TerritoriesGeochronology, Diamond - inclusions
DS2002-1579
2002
Harris, J.W.Tappert, R., Stachel, T., Harris, J.W., Brey, G.P.Composition of mineral inclusions from Brazilian diamondsGac/mac Annual Meeting, Saskatoon, Abstract Volume, P.116., p.116.BrazilAlluvials, Deposit - Aranapolis, Canastra
DS2002-1580
2002
Harris, J.W.Tappert, R., Stachel, T., Harris, J.W., Brey, G.P.Composition of mineral inclusions from Brazilian diamondsGac/mac Annual Meeting, Saskatoon, Abstract Volume, P.116., p.116.BrazilAlluvials, Deposit - Aranapolis, Canastra
DS2003-0157
2003
Harris, J.W.Brenker, F.E., Stachel, T., Harris, J.W.TEM analysis of inclusions in diamonds from the lower mantle and transition zone8ikc, Www.venuewest.com/8ikc/program.htm, Session 3, POSTER abstractGuineaDiamonds - inclusions
DS2003-0186
2003
Harris, J.W.Burgess, R., Harrison, D., Hobson, E., Harris, J.W.Noble gas and halogen constraints on the origin of volatile rich fluids in Canadian8ikc, Www.venuewest.com/8ikc/program.htm, Session 3, POSTER abstractNorthwest TerritoriesDiamonds - mineralogy, Deposit - Panda
DS2003-0187
2003
Harris, J.W.Burgess, R., Kiviets, G., Harris, J.W.Different age populations of eclogitic diamonds in the Venetia kimberlite: evidence from8 Ikc Www.venuewest.com/8ikc/program.htm, Session 2, AbstractSouth AfricaDiamonds - geochronology, Deposit - Venetia
DS2003-0224
2003
Harris, J.W.Cartigny, P., Stachel, T., Harris, J.W., Javoy, M.C and N stable isotope characteristics of diamonds from Namibia8 Ikc Www.venuewest.com/8ikc/program.htm, Session 2, AbstractNamibiaEclogites, diamonds, Geochronology
DS2003-0467
2003
Harris, J.W.Ginnermann, J., Kusaka, K., Harris, J.W.Oriented graphite single crystal inclusions in diamondZeitschrift fur Kristallographie, Vol. 218, 11, pp. 733-739.GlobalDiamond - inclusions
DS2003-0473
2003
Harris, J.W.Glennemann, S., Kusaja, K., Harris, J.W.Oriented graphite single crystal inclusions in diamondZeitschrift fur Kristallographe, GlobalBlank
DS2003-0629
2003
Harris, J.W.Izraeli, E.S., Harris, J.W., Navon, O.Mineral inclusions in cloudy diamonds from Koffiefontein, South Africa8ikc, Www.venuewest.com/8ikc/program.htm, Session 3, POSTER abstractSouth AfricaDiamonds - inclusions, Deposit - Koffiefontein
DS2003-0795
2003
Harris, J.W.Leost, I., Stachel, T., Brey, G.P., Harris, J.W., Ryabchikov, I.D.Diamond formation and source carbonation: mineral associations in diamonds fromContributions to Mineralogy and Petrology, Vol. 145, 1, pp. 15-24.NamibiaDiamond genesis
DS2003-0796
2003
Harris, J.W.Leost, I., Tachel, T., Brey, G.P., Harris, J.W.An unusual suite of inclusions in diamonds from Namibia8 Ikc Www.venuewest.com/8ikc/program.htm, Session 3, AbstractNamibiaDiamonds, Diamond - inclusions
DS2003-0797
2003
Harris, J.W.Leost, J., Stachel, T., Brey, G.P., Harris, J.W., Ryabichikov, I.D.Diamond formation and source carbonation: mineral associations in diamonds fromContribution to Mineralogy and Petrology, NamibiaDiamond mineralogy, morphology, genesis
DS2003-1074
2003
Harris, J.W.Phillips, D., Harris, J.W.The effect of differential mineral compressibility on diamond inclusion thermobarometry8 Ikc Www.venuewest.com/8ikc/program.htm, Session 3, AbstractSouth AfricaDiamonds - geothermobarometry, Deposit - Kimberley Pool
DS2003-1161
2003
Harris, J.W.Richardson, S.H., Shirey, S.B., Harris, J.W.Episodic diamond genesis and Kaapvaal Craton evolution8 Ikc Www.venuewest.com/8ikc/program.htm, Session 3, AbstractSouth AfricaDiamonds, Geochronology
DS2003-1248
2003
Harris, J.W.Seitz, H.M., Brey, G.P., Stachel, T., Harris, J.W.Li abundances in inclusions in diamonds from the upper and lower mantleChemical Geology, Vol. 201, 3-4, Nov. 28, pp. 307-318.MantleEclogites, peridotites, diamond
DS2003-1249
2003
Harris, J.W.Seitz, H.M., Brey, G.P., Stachel, T., Harris, J.W.Lithium abundances in inclusions in diamonds from the upper and lower mantle8ikc, Www.venuewest.com/8ikc/program.htm, Session 4, POSTER abstractMantleMantle geochemistry, Diamond - inclusions
DS2003-1250
2003
Harris, J.W.Seitz, H-M., Brey, G.P., Stahel, T., Harris, J.W.Li abundances in inclusions in diamonds from the upper and lower mantleChemical Geology, Vol. 201, 3-4, Nov. 28, pp. 307-318.MantleBlank
DS2003-1267
2003
Harris, J.W.Shirey, S.B., Harris, J.W., Richardson, S.H.,Fouch, M., James, D.E., CartignyRegional patterns in the paragenesis and age of inclusions in diamond, diamondLithos, Vol. 71, 2-4, pp. 243-258.South AfricaDiamond inclusions
DS2003-1268
2003
Harris, J.W.Shirey, S.B., Richardson, S.H., Harris, J.W.Integrated models of diamond formation and craton evolution8 Ikc Www.venuewest.com/8ikc/program.htm, Session 9, AbstractSouth Africa, ZimbabweCraton studies - lithosphere, Review
DS2003-1324
2003
Harris, J.W.Stachel, T., Aulbavh, S., Brey, G.P., Harris, J.W., Leost, I., Tappert, R., ViljoenDiamond formation and mantle metasomatism: a trace element perspective8 Ikc Www.venuewest.com/8ikc/program.htm, Session 3, AbstractGlobalDiamonds, database REE 135 peridotite garnet inclusions, Review - genesis
DS2003-1325
2003
Harris, J.W.Stachel, T., Harris, J.W., Tappert, R., Brey, G.P.Peridotitic diamonds from the Slave and the Kaapvaal cratons similarities andLithos, Vol. 71, 2-4, pp. 489-503.South Africa, Northwest Territories, NunavutMineral chemistry
DS2003-1359
2003
Harris, J.W.Tappert, R., Stachel, T., Harris, J.W., Brey, G.P.Mineral inclusions in diamonds from the PAnd a kimberlite, Slave Province, Canada8ikc, Www.venuewest.com/8ikc/program.htm, Session 3, POSTER abstractNorthwest TerritoriesDiamonds - inclusions, Deposit - Panda
DS2003-1470
2003
Harris, J.W.Westerlund, K.J., Shirey, S.B., Richardson, S.H., Gurney, J.J., Harris, J.W.RE Os isotope systematics of peridotitic diamond inclusion sulfides from the Panda8ikc, Www.venuewest.com/8ikc/program.htm, Session 3, POSTER abstractNorthwest TerritoriesDiamonds - inclusions, Deposit - Panda
DS200412-0206
2004
Harris, J.W.Brey, G.P., Bulatov, V., Girnis, A., Harris, J.W., Stachel, T.Ferropericlase - a lower mantle phase in the upper mantle.Lithos, Vol. 77, 1-4, Sept. pp. 655-663.South America, BrazilUHP, diamond inclusions, olivine, San Luiz
DS200412-0244
2003
Harris, J.W.Burgess, R., Kiviets, G., Harris, J.W.Different age populations of eclogitic diamonds in the Venetia kimberlite: evidence from Ar Ar dating of syngenetic clinopyroxen8 IKC Program, Session 2, AbstractAfrica, South AfricaDiamonds - geochronology Deposit - Venetia
DS200412-0245
2004
Harris, J.W.Burgess, R., Kiviets, G.B., Harris, J.W.Ar Ar age determinations of eclogitic clinopyroxene and garnet inclusions in diamonds from the Venetia and Orapa kimberlites.Lithos, Vol. 77, 1-4, Sept. pp. 113-124.Africa, South Africa, BotswanaGeochronology, dating
DS200412-0291
2003
Harris, J.W.Cartigny, P., Harris, J.W., Taylor, A., Davies, R., Javoy, M.On the possibility of a kinetic fractionation of nitrogen stable isotopes during natural diamond growth.Geochimica et Cosmochimica Acta, Vol. 67, 8, pp. 1571-76.TechnologyDiamond morphology
DS200412-0292
2003
Harris, J.W.Cartigny, P., Stachel, T., Harris, J.W., Javoy, M.C and N stable isotope characteristics of diamonds from Namibia.8 IKC Program, Session 2, AbstractAfrica, NamibiaEclogite, diamonds, geochronology
DS200412-0293
2004
Harris, J.W.Cartigny, P., Stachel, T., Harris, J.W., Javoy, M.Constraining diamond metasomatic growth using C - and N stable isotopes: examples from Namibia.Lithos, Vol. 77, 1-4, Sept. pp. 359-373.Africa, NamibiaPlacers, alluvials, Nitrogen, metasomatism
DS200412-0435
2004
Harris, J.W.Deines, P., Harris, J.W.New insights into the occurrence of 13 C depleted carbon in the mantle from two closely associated kimberlites: Letlhakane and OLithos, Vol. 77, 1-4, Sept. pp. 125-142.Africa, BotswanaDiamond inclusions, carbon isotope, websterite
DS200412-0667
2003
Harris, J.W.Ginnermann, J., Kusaka, K., Harris, J.W.Oriented graphite single crystal inclusions in diamond.Zeitschrift fur Kristallographie, Vol. 218, 11, pp. 733-739.TechnologyDiamond - inclusions
DS200412-0675
2003
Harris, J.W.Glennemann, S., Kusaja, K., Harris, J.W.Oriented graphite single crystal inclusions in diamond.Zeitschrift fur Kristallographie, Vol.218, 11, pp. 733-TechnologyDiamond - morphology, inclusions
DS200412-0676
2004
Harris, J.W.Glinnemann, J., Burghammer, M., Winkler, B., Nasdala, L., Harris, J.W.Single crystal graphite inclusions in natural diamonds.Lithos, ABSTRACTS only, Vol. 73, p. S44. abstractCanada, Northwest TerritoriesDiamond morphology, Panda, Ekati
DS200412-0798
2004
Harris, J.W.Harris, J.W., Stachel, T., Leost, I., Brey, G.P.Peridotitic diamonds from Namibia: constraints on the composition and evolution of their mantle source.Lithos, Vol. 77, 1-4, Sept. pp. 209-223.Africa, NamibiaPlacer, alluvials, diamond inclusions, metasomatism,REE
DS200412-0847
2004
Harris, J.W.Honda, M., Phillips, D., Harris, J.W., Yatsevich, I.Unusual noble gas compositions in polycrystalline diamonds: preliminary results from the Jwaneng kimberlite, Botswana.Chemical Geology, Vol. 203, 3-4, Feb. 16, pp. 347-358.Africa, BotswanaMantle evolution, lithosphere, geochemistry
DS200412-0887
2004
Harris, J.W.Izraeli, E.S., Harris, J.W., Navon, O.Fluid and mineral inclusions in cloudy diamonds from Koffiefontein, South Africa.Geochimica et Cosmochimica Acta, Vol. 68, 11, pp. 2561-2575.Africa, South AfricaDiamond inclusions
DS200412-0933
1999
Harris, J.W.Joswig, W., Stachel, T., Harris, J.W., Baur, W.H., Brey, G.P.New Ca silicate inclusions in diamonds - tracers from the lower mantle.Earth and Planetary Science Letters, Vol. 173, pp. 1-6.TechnologyDiamond inclusions
DS200412-1116
2003
Harris, J.W.Leost, I., Stachel, T., Brey, G.P., Harris, J.W., Ryabchikov, I.D.Diamond formation and source carbonation: mineral associations in diamonds from Namibia.Contributions to Mineralogy and Petrology, Vol. 145, 1, pp. 15-24.Africa, NamibiaDiamond genesis
DS200412-1117
2003
Harris, J.W.Leost, I., Tachel, T., Brey, G.P., Harris, J.W.An unusual suite of inclusions in diamonds from Namibia.8 IKC Program, Session 3, AbstractAfrica, NamibiaDiamonds Diamond - inclusions
DS200412-1259
2004
Harris, J.W.McCammon, C.A., Stachel, T., Harris, J.W.Iron oxidation state in lower mantle mineral assemblages. Part 1.Earth and Planetary Science Letters, Vol. 222, 2, pp. 423-434.MantleMineral chemistry
DS200412-1406
2003
Harris, J.W.Nasdala, L., Brenker, F.E., Glinnemann, J., Hofmeister, W., Gasparik, T., Harris, J.W., Stachel, T., Reese, I.Spectroscopic 2D tomography: residual pressure and strain around mineral inclusions in diamonds.European Journal of Mineralogy, Vol.15, 6, pp. 931-36.TechnologyTechnology - tomography inclusions
DS200412-1540
2003
Harris, J.W.Phillips, D., Harris, J.W.The effect of differential mineral compressibility on diamond inclusion thermobarometry.8 IKC Program, Session 3, AbstractAfrica, South AfricaDiamonds - geothermobarometry Deposit - Kimberley Pool
DS200412-1541
2004
Harris, J.W.Phillips, D., Harris, J.W., Kiviets, G.B.40 Ar 39 Ar analyses of clinopyroxene inclusions in African diamonds: implications for source ages of detrital diamonds.Geochimica et Cosmochimica Acta, Vol. 68, 1, pp. 151-165.Africa, Democratic Republic of Congo, Botswana, South AfricaMbuji-Mayi, Jwaneng, Orapa, Premier
DS200412-1542
2004
Harris, J.W.Phillips, D., Harris, J.W., Viljoen, K.S.Mineral chemistry and thermobarometry of inclusions from De Beers Pool diamonds, Kimberley, South Africa.Lithos, Vol. 77, 1-4, Sept. pp. 155-179.Africa, South AfricaDiamond Inclusions, silicate, oxide, harzburgitic
DS200412-1662
2003
Harris, J.W.Richardson, S.H., Shirey, S.B., Harris, J.W.Episodic diamond genesis and Kaapvaal Craton evolution.8 IKC Program, Session 3, AbstractAfrica, South AfricaDiamonds Geochronology
DS200412-1663
2004
Harris, J.W.Richardson, S.H., Shirey, S.B., Harris, J.W.Episodic diamond genesis at Jwaneng, Botswana, and implications for Kaapvaal craton evolution.Lithos, Vol. 77, 1-4, Sept. pp. 143-154.Africa, BotswanaDiamond inclusions, eclogite, peridotite, sulfide, geoc
DS200412-1784
2003
Harris, J.W.Seitz, H-M., Brey, G.P., Stahel, T., Harris, J.W.Li abundances in inclusions in diamonds from the upper and lower mantle.Chemical Geology, Vol. 201, 3-4, Nov. 28, pp. 307-318.MantleDiamond inclusions, eclogites, peridotites, websterite.
DS200412-1806
2003
Harris, J.W.Shirey, S.B., Harris, J.W., Richardson, S.H.,Fouch, M., James, D.E., Cartigny, P.,Deines, P., Vijoen, F.Regional patterns in the paragenesis and age of inclusions in diamond, diamond composition and the lithospheric seismic structurLithos, Vol. 71, 2-4, pp. 243-258.Africa, South AfricaDiamond inclusions
DS200412-1807
2003
Harris, J.W.Shirey, S.B., Richardson, S.H., Harris, J.W.Integrated models of diamond formation and craton evolution.8 IKC Program, Session 9, AbstractAfrica, South Africa, ZimbabweCraton studies - lithosphere Review
DS200412-1808
2004
Harris, J.W.Shirey, S.B., Richardson, S.H., Harris, J.W.Age, paragenesis and composition of diamonds and evolution of the Precambrian mantle lithosphere of southern Africa.South African Journal of Geology, Vol. 107, 1/2, pp. 91-106.Africa, South AfricaDiamond genesis, geochronology
DS200412-1809
2004
Harris, J.W.Shirey, S.B., Richardson, S.H., Harris, J.W.Integrated models of diamond formation and craton evolution.Lithos, Vol. 77, 1-4, Sept. pp. 923-944.AfricaKimberley area, diamond inclusions, sulfide, silicate
DS200412-1905
2004
Harris, J.W.Stachel, T., Aulbach, S., Brey, G.P., Harris, J.W., Leost, I., Tappert, R., Vijoen, K.S.The trace element composition of silicate inclusions in diamonds: a review.Lithos, Vol. 77, 1-4, Sept. pp. 1-19.MantleDiamond inclusion, REE, metasomatism, lithosphere, garn
DS200412-1906
2003
Harris, J.W.Stachel, T., Aulbavh, S., Brey, G.P., Harris, J.W., Leost, I., Tappert, R., Viljoen, K.S.Diamond formation and mantle metasomatism: a trace element perspective.8 IKC Program, Session 3, AbstractTechnologyDiamonds, database REE 135 peridotite garnet inclusions Review - genesis
DS200412-1909
1997
Harris, J.W.Stachel, T., Harris, J.W.Syngenetic inclusions in diamond from the Birim Field, ( Ghana) - a deep peridotitic profile with a history of depletion and re-Contributions to Mineralogy and Petrology, Vol. 127, pp. 336-352.Africa, GhanaDiamond inclusions
DS200412-1910
2003
Harris, J.W.Stachel, T., Harris, J.W., Tappert, R., Brey, G.P.Peridotitic diamonds from the Slave and the Kaapvaal cratons similarities and differences based on a preliminary dat a set.Lithos, Vol. 71, 2-4, pp. 489-503.Africa, South Africa, Northwest Territories, NunavutMineral chemistry
DS200412-1912
2004
Harris, J.W.Stachel, T., Vijoen, K.S., McDada, P., Harris, J.W.Survival of diamonds during major tectonothermal events - peridotitic inclusions in diamonds from Orapa and Jwaneng.Geological Association of Canada Abstract Volume, May 12-14, SS14-13 p. 272.abstractAfrica, BotswanaGeochemistry - major element
DS200412-1913
2004
Harris, J.W.Stachel, T., Viljoen, K.S., McDade,P.,Harris, J.W.Diamondiferous lithospheric roots along the western margin of the Kalahari Craton - the peridotitic inclusion suites in diamondsContributions to Mineralogy and Petrology, Vol. 147, 1, pp. 32-47.Africa, BotswanaDiamond genesis, Orapa, Jwaneng deposits
DS200412-1964
2004
Harris, J.W.Tappert, R., Stachel, T., Harris, J.W., Brey, G.P., Ludwig, T.Messingers from the sublithospheric mantle: diamonds and their mineral inclusions from the Jagersfontein kimberlite ( South AfriGeological Association of Canada Abstract Volume, May 12-14, SS14-11 p. 270.abstractAfrica, South AfricaDiamond inclusions, morphology
DS200512-0768
2005
Harris, J.W.Nasdala, L., Hofmeister, W., Harris, J.W., Glinnemann, J.Growth zoning and strain patterns inside diamond crystals as revealed by Raman maps.American Mineralogist, Vol. 90, pp. 745-748.Canada, Northwest TerritoriesRaman mapping technology - Panda, Ekati
DS200512-1039
2005
Harris, J.W.Stachel, T., Brey, G.P., Harris, J.W.Inclusions in sublithospheric diamonds: glimpses of deep Earth.Elements, Vol. 1, 2, March pp. 73-79.MantleDiamond inclusion, majorite, perovskite, subduction
DS200512-1074
2005
Harris, J.W.Tappert, R., Stachel, T., Harris, J.W., Shimizu, N., Brey, G.P.Mineral inclusions in diamonds from the PAnd a kimberlite, Slave Province, Canada.European Journal of Mineralogy, Vol. 17, 3, pp. 423-440.Canada, Northwest TerritoriesMineralogy - Panda
DS200612-0431
2005
Harris, J.W.Gautheron, C., Cartigny, P., Moreira, M., Harris, J.W., Allegre, C.J.Evidence for a mantle component shown by rare gases, C and N isotopes in polycrystalline diamonds from Orapa (Botswana).Earth and Planetary Science Letters, Vol. 240, 3-4, Dec. 15, pp. 559-572.Africa, BotswanaMineral chemistry - compositional elements
DS200612-0538
2006
Harris, J.W.Harris, J.W.Mineral inclusions in diamond - a Scouser's view.Geochimica et Cosmochimica Acta, Vol. 70, 18, p. 13. abstract only.TechnologyDiamond inclusions
DS200612-0605
2006
Harris, J.W.Howell, D., Jones, A.P., Dobson, D.P., Milledge, H.J., Harris, J.W.Birefringence analysis of diamond utilising the MetriPol system.Geochimica et Cosmochimica Acta, Vol. 70, 18, p. 268. abstract only.TechnologyDiamond morphology
DS200612-1059
2006
Harris, J.W.Pearson, D.G., Harris, J.W.Diamond geochronology - a record of continental lithosphere evolution.Geochimica et Cosmochimica Acta, Vol. 70, 18, p. 13. abstract only.MantleGeochronology
DS200612-1159
2006
Harris, J.W.Richardson, S.H., Harris, J.W., Pomi, P.F.Antiquity of harzburgitic diamonds from the Venetia kimberlite, Limpopo Belt, Kaapvaal Craton.Geochimica et Cosmochimica Acta, Vol. 70, 18, p. 17. abstract only.Africa, South AfricaDeposit - Venetia,diamond genesis
DS200612-1260
2006
Harris, J.W.Seitz, H.M., Brey, G.P., Harris, J.W., Ludwig, T.Lithium isotope composition of lower mantle ferropericlase inclusions in diamonds from Sao Luiz, Brazil.Geochimica et Cosmochimica Acta, Vol. 70, 18, p. 17. abstract only.South America, BrazilDeposit - Sao Luiz, diamond inclusions
DS200612-1412
2006
Harris, J.W.Tappert, R., Stachel, T., Harris, J.W., Muehlenbachs, K., Brey, G.P.Placer diamonds from Brazil: indicators of the composition of the Earth's mantle and the distance to their kimberlitic sources.Economic Geology, Vol. 101, 2, pp. 543-470.South America, Brazil, Mato Grosso, Roraima, Minas GeraisDiamond morphology, inclusions
DS200612-1413
2005
Harris, J.W.Tappert, R., Stachel, T., Harris, J.W., Muehlenbachs, K., Ludwig, T., Brey, G.P.Diamonds from Jagersfontein (South Africa): messengers from the sublithopheric mantle.Contributions to Mineralogy and Petrology, Vol. 150, 5, pp. 505-522.Africa, South AfricaDiamond inclusions
DS200612-1414
2006
Harris, J.W.Tappert, R., Stachel, T., Muehlenbachs, K., Harris, J.W., Brey, G.P.Alluvial diamonds from Brazil: where and what are their sources?Geochimica et Cosmochimica Acta, Vol. 70, 18, p. 4. abstract onlySouth America, BrazilDiamond genesis
DS200612-1423
2006
Harris, J.W.Thomassot, E., Cartigny, P., Lorand, J=P., Harris, J.W., Chaussidon, M.Protogenetic sulfide inclusions in diamonds evidenced from delta33S, 15N, 13 C analyses.Geochimica et Cosmochimica Acta, Vol. 70, 18, 1, p. 15, abstract only.TechnologyDiamond inclusions
DS200612-1434
2006
Harris, J.W.Tomlinson, E.L., Jones, A.P., Harris, J.W.Co-existing fluid and silicate inclusions in mantle diamond.Earth and Planetary Science Letters, Vol. 250, 3-4, pp. 581-595.MantleDiamond inclusions
DS200612-1522
2006
Harris, J.W.Westerlund, K.J., Shirey, S.B., Richardson, S.H., Carlson, R.W., Gurney, J.J., Harris, J.W.A subduction wedge origin for Paleoarchean peridotitic diamonds and harzburgites from the PAnd a kimberlite, Slave Craton: evidence from Re Os isotope systematics.Contributions to Mineralogy and Petrology, Vol. 152, 3, pp. 275-294.Canada, Northwest TerritoriesSubduction, deposit - Panda
DS200712-0040
2007
Harris, J.W.Aulbach, S., Shirey, S.B., Stachel, T., Harris, J.W.Proterozoic diamond formation at the Kaapvaal craton edge: Re-Os of Jagersfontein sulfide inclusions.Plates, Plumes, and Paradigms, 1p. abstract p. A44.Africa, South AfricaDiamond genesis
DS200712-1078
2007
Harris, J.W.Thmassot, E., Cartigny, P., Harris, J.W., Viljoen, K.S.F.Methane related diamond crystallization in the Earth's mantle: stable isotope evidence from a single diamond bearing xenolith.Earth and Planetary Science Letters, Vol. 257, pp. 362-371.MantleDiamond genesis
DS200712-1079
2007
Harris, J.W.Thomassot, E., Cartigny, P., Harris, J.W., Viljoen, K.S.F.Methane related deiamond crystallization in the Earth's mantle: stable isotope evidences from a single diamond bearing xenolith.Earth and Planetary Science Letters, Vol. 257, 3-4, May 30, pp. 362-371.Africa, South AfricaXenolith
DS200712-1088
2007
Harris, J.W.Tomlinson, E.I., Beard, A.D., Harris, J.W.A snapshot of mantle metasomatism?Plates, Plumes, and Paradigms, 1p. abstract p. A1029.Canada, Northwest TerritoriesPanda
DS200712-1089
2006
Harris, J.W.Tomlinson, E.L., Jones, A.P., Harris, J.W.Co-existing fluid and silicate inclusions in mantle diamond.Earth and Planetary Science Letters, Vol. 250, 3-4, Oct. 30, pp. 581-595.MantleDiamond inclusions
DS200812-0062
2009
Harris, J.W.Aulbach, S., Shirey, S.B., Stachel, T., Creighton, S., Muehlenbachs, K., Harris, J.W.Diamond formation episodes at the southern margin of the Kaapvaal Craton: Re-Os systematics of sulfide inclusions from the Jagersfontein mine.Contributions to Mineralogy and Petrology, Vol. 157, pp. 525-540.Africa, South AfricaDeposit - Jagersfontein
DS200812-0182
2008
Harris, J.W.Caro, G., Bennett, V.C., Bourdon, B., Harrison, T.M., Von Quadt, A., Mojzsis, S.J., Harris, J.W.Application of precise 142 Nd 144 Nd analysis of small samples to inclusions in diamonds ( Finsch SA ) and Hadean zircons ( Jack Hills, Western Australia).Chemical Geology, Vol. 247, 1-2, pp. 253-265.Africa, South Africa, AustraliaGeochronology
DS200812-0893
2008
Harris, J.W.Phillips, D., Harris, J.W.Provenance studies from 40 Ar 39 Ar dating of mineral inclusions in diamonds: methodological tests on the Orapa kimberlite, Botswana.Earth and Planetary Science Letters, Vol. 274, 1-2, pp. 169-178.Africa, BotswanaDeposit - Orapa
DS200812-1060
2008
Harris, J.W.Shirey, S.B., Richardson, S.H., Pearson, D.G., Carlson, R.W., Harris, J.W.Eclogitic sulfide and silicate inclusions in diamonds and subcontinental geological processes.Goldschmidt Conference 2008, Abstract p.A862.Africa, Botswana, South AfricaDeposit - Jwaneng, Koffiefontein, Orapa, Premier,Venetia
DS200812-1110
2008
Harris, J.W.Stachel, T., Harris, J.W.The origin of cratonic diamonds - constraints from mineral inclusions.Ore Geology Reviews , 83p.GlobalMineral inclusions - review
DS200812-1168
2008
Harris, J.W.Thomassot, E., Cartigny, P., Harris, J.W.Sulfide bearing diamonds: the exception, not the rule.Goldschmidt Conference 2008, Abstract p.A945.Africa, Botswana, South AfricaDeposit - Jwaneng, Kimberley, Koffiefontein
DS200812-1179
2008
Harris, J.W.Tomlinson, E.I., Muller, W., Hinton, R.W., Klein Ben-David, O., Pearson, D.G., Harris, J.W.Metasomatic processes recorded in fibrous diamonds.Goldschmidt Conference 2008, Abstract p.A950.Canada, Northwest TerritoriesDeposit - Panda
DS200912-0031
2009
Harris, J.W.Banas, A., Stachel, T., Phillips, D., Shimizu, N., Viljoen, K.S., Harris, J.W.Ancient metasomatism recorded by ultra-depleted garnet inclusions in diamonds from De Beers Pool, South Africa.Lithos, In press availableAfrica, South AfricaDeposit - DeBeers Pool
DS200912-0099
2009
Harris, J.W.Cartigny, P., Farquar, J., Thomassot, E., Harris, J.W., Wing, B., Masterson, A., McKeegan, K., Stachel, T.A mantle origin for Paleoarchean peridotite diamonds from the PAnd a kimberlite, Slave Province: evidence from 13C, 15N and 34,34S stable isotope systematics.Lithos, In press - available 38p.Canada, Northwest TerritoriesDeposit - Panda
DS200912-0422
2009
Harris, J.W.Laiginhas, F., Pearson, D.G., Phillips, D., Burgess, R., Harris, J.W.Re Os and 40Ar 39Ar isotope measurements of inclusions in alluvial diamonds from the Ural Mountains: constraints on diamond genesis and eruption ages.Lithos, in press availableRussia, UralsGeochronology
DS200912-0588
2009
Harris, J.W.Phillips, D., Harris, J.W.Diamond provenance studies from 40 Ar 39 Ar dating of clinopyroxene inclusions: an example from the west coast of Namibia.Lithos, In press availableAfrica, NamibiaGeochronology
DS200912-0626
2009
Harris, J.W.Richardson, S.H., Pomi, P.F., Shirey, S.B., Harris, J.W.Age and origin of peridotite diamonds from Venetia, Limpopo belt, Kaapval- Zimbabwe Craton.Lithos, In press available, 35p.Africa, South AfricaDeposit - Venetia
DS200912-0729
2009
Harris, J.W.Stachel, T., Harris, J.W.Formation of diamond in the Earth's mantle.Journal of Physics Condensed Matter, in press ( August)MantleDiamond genesis
DS200912-0730
2009
Harris, J.W.Stachel, T., Harris, J.W., Muehlenbachs, K.Sources of carbon in inclusion bearing diamonds.Lithos, In press available 65p.TechnologyDiamond inclusions
DS200912-0755
2009
Harris, J.W.Thomassot, E., Cartigny, P., Harris, J.W., Lorand, J.P., Rollion-Bard, C., Chaussidon, M.Metasomatic diamond growth: a multi isotope study ( 13C, 15N, 33S, 34S) of sulphide inclusions and their host diamonds from Jwaneng (Botswana).Earth and Planetary Science Letters, Vol. 282, 1-4, pp. 79-90.Africa, BotswanaDeposit - Jwaneng
DS200912-0810
2009
Harris, J.W.Weiss, Y., Kessel, R., Griffin, W.L., Kiflawi, I., Klein-BenDavid, O., Bell, D.R., Harris, J.W., Navon, O.A new model for the evolution of diamond forming fluids: evidence from Micro inclusion bearing diamonds from Kankan, Guinea.Lithos, In press - available 43p.Africa, GuineaDeposit - Kankan
DS201012-0146
2009
Harris, J.W.Deines, P., Stachel, T., Harris, J.W.Systematic regional variations in diamond carbon isotopic composition and inclusion chemistry beneath the Orapa kimberlite cluster, in Botswana.Lithos, Vol. 112 S pp. 776-784,Africa, BotswanaDeposit - Orapa
DS201012-0292
2010
Harris, J.W.Howell, D., Wood, I.G., Dobson, D.P., Jones, A.P., Nasdala, L., Harris, J.W.Quantifying strain birefringence halos around inclusions in diamond.Contributions to Mineralogy and Petrology, Vol. 160, pp. 705-717.TechnologyDiamond genesis, inclusion remnant pressure
DS201012-0821
2010
Harris, J.W.Viljoen, K.S., Harris, J.W., Ivanic, T., Richardson, S.H., Whitehead, K.Trace element geochemistry and Ni thermometry of garnet inclusions in peridotitic diamonds from Premier and Finsch, South Africa: implications - diamond formationInternational Mineralogical Association meeting August Budapest, abstract p. 187.Africa, South AfricaGeochemistry
DS201112-0447
2011
Harris, J.W.Honda, M., Phillips, D., Harris, J.W., Matsumoto, T.He, Ne and Ar in peridotitic and eclogitic paragenesis diamonds from the Jwaneng kimberlite, Botswana - implications for mantle evolution and diamond formation ages.Earth and Planetary Science Letters, Vol. 301, 1-2, pp. 43-51.Africa, BotswanaGeocheonology - Jwaneng
DS201112-0732
2011
Harris, J.W.Nestola, F., Nimis, P., Ziberna, L., Longo, M., Marzoli, A., Harris, J.W., Manghnani, M.H., Fedortchuk, Y.First crystal structure determination of olivine in diamond: composition and implications for provenance in the Earth's mantle.Earth and Planetary Science Letters, Vol. 305, 1-2, pp. 249-255.MantleInclusion - olivine in diamond
DS201112-0733
2011
Harris, J.W.Nestola, F., Nimis,P., Harris, J.W.Crystallographic relationships between diamond and its olivine inclusions.Goldschmidt Conference 2011, abstract p.1533.RussiaUdachnaya
DS201212-0111
2012
Harris, J.W.Cartigny, P., Harris, J.W.Eclogitic and peridotitic diamond formation(Kimberley Pool kimberlites, South Africa), as evidenced from C, N stable isotope: a main mantle derived source.10th. International Kimberlite Conference Feb. 6-11, Bangalore India, AbstractAfrica, South AfricaDeposit - Kimberley Pool
DS201212-0112
2012
Harris, J.W.Cartigny, P., Palot, M., Clog, M., Labidi, J., Thomassot, E., Aubaud, C., Busigny, V., Harris, J.W.On overview of the deep carbon cycle and its isotope heterogeneity.Goldschmidt Conference 2012, abstract 1p.MantleCarbon cycle
DS201212-0463
2012
Harris, J.W.Melton, G.L., McNeill, J., Stachel, T., Pearson, D.G., Harris, J.W.Trace elements in gem diamond from Akwatia, Ghana and De Beers Pool, South Africa.Chemical Geology, Vol. 314-317, pp. 1-8.Africa, South Africa, GhanaDeposit - Akwatia, DeBeers Pool - Inclusions
DS201212-0518
2012
Harris, J.W.Nestola, F., Nimis, P., Harris, J.W.Crystallographic relationships between diamond and its olivine inclusions.10th. International Kimberlite Conference Held Bangalore India Feb. 6-11, Poster abstractTechnologyDiamond genesis
DS201212-0537
2012
Harris, J.W.Palot, M., Cartigny, P., Harris, J.W., Kaminsky, F.V., Stachel, T.Evidence for deep mantle convection and primordial heterogeneity from nitrogen and carbon isotopes in diamond.Earth and Planetary Science Letters, Vol. 357-358, pp. 179-193.South America, Brazil, Africa, GuineaDeposit - Juina, Kankan
DS201212-0538
2012
Harris, J.W.Palot, M., Pearson, D.G., Stern, R., Stachel, T., Harris, J.W.Multiple growth events, processes and fluid sources involved in the growth of diamonds from Finsch mine, RSA: a micro-analytical study.10th. International Kimberlite Conference Feb. 6-11, Bangalore India, AbstractAfrica, South AfricaDeposit - Finsch
DS201212-0778
2012
Harris, J.W.Wiggers de Vries, D.F., Harris, J.W., Pearson, D.G., Davies, G.R.Re-Os isotope constraints on the ages of diamonds from Mwadui, Tanzania.10th. International Kimberlite Conference Held Bangalore India Feb. 6-11, Poster abstractAfrica, TanzaniaDeposit - Mwadui
DS201312-0415
2013
Harris, J.W.Ickert, R.B., Stachel, T., Stern, R.A., Harris, J.W.Diamond from recycled crustal carbon documented by coupled delta 18 O-delta 13 C measurements of diamonds and their inclusions.Earth and Planetary Science Letters, Vol. 364, pp. 85-97.MantleDiamond inclusions
DS201312-0598
2013
Harris, J.W.Melton, G.L., Stachel, T., Stern, R.A., Carlson, J., Harris, J.W.Micro and macro diamond characteristics from the PAnd a kimberlite.Geoscience Forum 40 NWT, abstract only p. 29Canada, Northwest TerritoriesDeposit - Panda
DS201312-0599
2013
Harris, J.W.Melton, G.L., Stachel, T., Stern, R.A., Carlson, J., Harris, J.W.Infrared spectral and carbon isotopic characteristics of micro- and macro diamonds from the PAnd a kimberlite, Central Slave Craton, Canada).Lithos, Vol. 177, pp. 110-119.Canada, Northwest TerritoriesDeposit - Panda
DS201312-0637
2013
Harris, J.W.Nasdala, L., Grambole, D., Wildner, M., Gigler, A.M., Hainschwang, T., Zaitsev, A.M., Harris, J.W., Milledge, J., Schulze, D.J., Hofmeister, W., Balmer, W.A.Radio-colouration of diamond: a spectroscopic study.Contributions to Mineralogy and Petrology, Vol. 165, pp. 843-861.Africa, South Africa, Democratic Republic of Congo, South America, Brazil, VenezuelaDiamond - colour
DS201312-0643
2013
Harris, J.W.Nestola, F., Nimis, P., Milani, S., Angel, R., Bruno, M., Harris, J.W.Crystallographic relationships between diamond and its olivine inclusions. An update.Goldschmidt 2013, AbstractRussia, YakutiaUdachnaya
DS201312-0677
2013
Harris, J.W.Palot, M., Pearson, D.G., Stern, R.A., Stachel, T., Harris, J.W.Multiple growth events, processes and fluid sources involved in diamond genesis: a micro-analytical study of sulphide bearing diamonds from Finsch mine, RSA.Geochimica et Cosmochimica Acta, Vol. 106, pp. 51-70.Africa, South AfricaDeposit - Finsch
DS201312-0879
2013
Harris, J.W.Stachel, T., Harris, J.W., Hunt, L., Muehlenbachs, K., and EIMFDiamonds from the Argyle lamproite ( Western Australia): different from any other mine?GAC-MAC 2013 SS4: Diamond: from birth in the mantle to emplacement in kimberlite, abstract onlyAustraliaDeposit - Argyle
DS201412-0004
2013
Harris, J.W.Agrosi, G., Tempesta, G., Scandael, E., Harris, J.W.Growth and post-growth defects in a diamond from Finsch mine ( South Africa).European Journal of Mineralogy, Vol. 25, pp. 551-559.Africa, South AfricaDeposit - Finsch
DS201412-0102
2014
Harris, J.W.Cartigny, P., Palot, M., Thomassot, E., Harris, J.W.Diamond formation: a stable isotope perspective.Annual Review of Earth and Planetary Sciences, Vol. 42, pp. 699-732.MantleDiamond - isotpe systematics
DS201412-0620
2014
Harris, J.W.Nestola,F., Nimis, P.,Angel, R.J., Milani, Bruno, S.,Prencipe, M., Harris, J.W.Olivine with diamond-imposed morphology included in diamonds. Syngenesis or Protogenesis.International Geology Review, Vol. 56, 13, pp. 1658-1667.RussiaDeposit - Udachnaya
DS201412-0656
2014
Harris, J.W.Palot, M., Pearson, D.G., Stern, R.A., Harris, J.W., Stachel, T.Fluid sources of ultradeep diamonds.2014 Yellowknife Geoscience Forum, p. 61, abstractAfrica, GuineaDeposit - Kankan
DS201412-0657
2014
Harris, J.W.Palot, M., Pearson, D.G., Stern, R.A., Stachel, T., Harris, J.W.Isotopic constraints on the nature and circulation of deep mantle C-H-O-N fluids: Carbon and nitrogen systematics within ultra-deep diamonds from Kankan ( Guinea).Geochimica et Cosmochimica Acta, Vol. 139, pp. 26-46.Africa, GuineaDeposit - Kankan
DS201412-0949
2014
Harris, J.W.Viljoen, K.S., Harris, J.W., Richardson, S.H., Gray, K.Trace element chemistry of peridotitic garnets in diamonds from the Premier ( Cullinan) and Finsch kimberlites, South Africa: contrasting styles of mantle metasomatism.Lithos, Vol. 208-209, pp. 1-15.Africa, South AfricaDeposit - Premier, Finsch
DS201507-0316
2015
Harris, J.W.Ickert, R.B., Stachel, T., Stern, R.A., Harris, J.W.Extreme 18O-enrichment in majorite constrains a crustal origin of transition zone diamonds.Geochemical Perspectives Letters, 1, pp. 65-74.Africa, South AfricaDeposit - Jagersfontein
DS201507-0329
2015
Harris, J.W.Novella, D., Bolfan-Casanova, N., Nestola, F., Harris, J.W.H2O in olivine and garnet inclusions still trapped in diamonds from the Siberian craton: implications for the water content of cratonic lithosphere peridotites.Lithos, Vol. 230, pp. 180-183.RussiaDeposit - Udachnaya
DS201604-0631
2016
Harris, J.W.Stachel, T., Stern, R.A., Luth, R.W., Pearson, D.G., Harris, J.W., DCO - Diamond ConsortiumModes of diamond precipitation through time.GAC MAC Meeting Special Session SS11: Cratons, kimberlites and diamonds., abstract 1/4p.TechnologyDiamond genesis
DS201608-1423
2016
Harris, J.W.Milani, S., Nestola, F., Angel, R.J., Nimis, P., Harris, J.W.Crystallographic orientations of olivine inclusions in diamonds.Lithos, in press available , 5p.Africa, South AfricaDeposit - Cullinan, Koffiefontein, Bultfontein

Abstract: In this work we report for the first time the crystallographic orientations of olivine inclusions trapped in diamonds from the Kaapvaal craton (South Africa) determined by single-crystal X-ray diffraction, and analyze them together with all available data in the literature. The overall data set indicates no preferred orientation of the olivine inclusions with respect to their diamond hosts. However, diamonds containing multiple olivine inclusions sometimes show clusters of olivines with the same orientation in the same diamond host. We conclude that such clusters can only be interpreted as the remnants of single olivine crystals pre-dating the growth of the host diamonds.
DS201608-1427
2016
Harris, J.W.Nestola, F., Cerantola, V., Milani, S., Anzolini, C., McCammon, C., Novella, D., Kupenko, I., Chumakov, A., Ruffer, R., Harris, J.W.Synchrotron Mossbauer source technique for in situ measurement of iron-bearing inclusions in natural diamonds.Lithos, in press available, 6p.South America, BrazilDeposit - Juina

Abstract: We describe a new methodology to collect energy domain Mössbauer spectra of inclusions in natural diamonds using a Synchrotron Mössbauer Source (SMS). Measurements were carried out at the Nuclear Resonance beamline ID18 at the European Synchrotron Radiation Facility (Grenoble, France). We applied this non-destructive approach to collect SMS spectra of a ferropericlase inclusion still contained within its diamond host from Juina (Brazil). The high spatial resolution of the measurement (~ 15 ?m) enabled multiple regions of the 190 × 105 ?m2 inclusion to be sampled and showed that while Fe3 +/Fetot values in ferropericlase were below the detection limit (0.02) overall, there was a magnetic component whose abundance varied systematically across the inclusion. Hyperfine parameters of the magnetic component are consistent with magnesioferrite, and the absence of superparamagnetism allows the minimum particle size to be estimated as ~ 30 nm. Bulk Fe3 +/Fetot values are similar to those reported for other ferropericlase inclusions from Juina, and their variation across the inclusion can provide constraints on its history.
DS201608-1428
2016
Harris, J.W.Nimis, P., Alvaro, M., Nestola, F., Angel, R.J., Marquardt, K., Rustioni, G., Harris, J.W., Marone, F.First evidence of hydrous silicic fluid films around solid inclusions in gem-qualty diamonds.Lithos, Vol. 260, pp. 384-389.Russia, Africa, South AfricaDeposit - Udachnaya, Premier

Abstract: Diamonds form from fluids or melts circulating at depth in the Earth's mantle. Analysis of these fluids is possible if they remain entrapped in the diamond during its growth, but this is rarely observed in gem-quality stones. We provide the first evidence that typical mineral inclusions in gem-quality diamonds from the Siberian and Kaapvaal cratons are surrounded by a thin film of hydrous silicic fluid of maximum thickness 1.5 ?m. The fluid contains Si2O(OH)6, Si(OH)4, and molecular H2O and was identified using confocal micro-Raman spectroscopy and synchrotron-based X-ray tomographic microscopy. As the solid mineral inclusions have both peridotitic and eclogitic affinities and occur in two cratonic regions, our results demonstrate the strong connection between water-rich fluids and the growth of gem-quality lithospheric diamonds. The presence of the fluid films should be taken into account for a proper evaluation of H2O contents in the mantle based on H2O contents in solid inclusions and for a robust assessment of diamond formation pressures based on the residual pressures of the inclusions.
DS201608-1430
2016
Harris, J.W.Palot, M., Jacobsen, S.D., Townsend, J.P., Nestols, F., Marquardt, K., Harris, J.W., Stachel, T., McCammon, C.A., Pearson, D.G.Evidence for H2O bearing fluids in the lower mantle from diamond inclusion.Lithos, in press available 27p.South America, BrazilSao Luis

Abstract: In this study, we report the first direct evidence for water-bearing fluids in the uppermost lower mantle from natural ferropericlase crystal contained within a diamond from São Luíz, Brazil. The ferropericlase exhibits exsolution of magnesioferrite, which places the origin of this assemblage in the uppermost part of the lower mantle. The presence of brucite-Mg(OH)2 precipitates in the ferropericlase crystal reflects the later-stage quenching of H2O-bearing fluid likely in the transition zone, which has been trapped during the inclusion process in the lower mantle. Dehydration melting may be one of the key processes involved in transporting water across the boundary between the upper and lower mantle.
DS201610-1891
2016
Harris, J.W.Nestola, F., Alvaro, M., Casati, M.N., Wilhelm, H., Kleppe, A.K., Jephcoat, A.P., Domeneghetti, M.C., Harris, J.W.Source assemblage types for cratonic diamonds from x-ray synchroton diffraction.Lithos, in press available 5p.RussiaDeposit - Udachnaya
DS201611-2095
2016
Harris, J.W.Anzolini, C., Angel, R.J., Merlini, M., Derzsi, M., Tokar, K., Milani, S., Krebs, M.Y., Brenker, F.E., Nestola, F., Harris, J.W.Depth of formation of CaSi)3 - walstromite included in super -deep diamonds.Lithos, in press available 43p.South America, Brazil, Mato GrossoDeposit - Juina

Abstract: "Super-deep" diamonds are thought to crystallize between 300 and 800 km depth because some of the inclusions trapped within them are considered to be the products of retrograde transformation from lower mantle or transition zone precursors. In particular, single inclusion CaSiO3-walstromite is believed to derive from CaSiO3-perovskite, although its real depth of origin has never been proven. Our aim is therefore to determine for the first time the pressure of formation of the diamond-CaSiO3-walstromite pair by “single-inclusion elastic barometry” and to determine whether CaSiO3-walstromite derives from CaSiO3-perovskite or not. We investigated several single phases and assemblages of Ca-silicate inclusions still trapped in a diamond coming from Juina (Brazil) by in-situ analyses (single-crystal X-ray diffraction and micro-Raman spectroscopy) and we obtained a minimum entrapment pressure of ~ 5.7 GPa (? 180 km) at 1500 K. However, the observed coexistence of CaSiO3-walstromite, larnite (?-Ca2SiO4) and CaSi2O5-titanite in one multiphase inclusion within the same diamond indicates that the sample investigated is sub-lithospheric with entrapment pressure between ~ 9.5 and ~ 11.5 GPa at 1500 K, based on experimentally-determined phase equilibria. In addition, thermodynamic calculations suggested that, within a diamond, single inclusions of CaSiO3-walstromite cannot derive from CaSiO3-perovskite, unless the diamond around the inclusion expands by ~ 30% in volume.
DS201705-0861
2017
Harris, J.W.Nestola, F., Cerantola, V., Milani, S., Anzolini, C., McCammon, C., Novella, D., Kupenko, I., Chumakov, A., Rueffer, R., Harris, J.W.Synchroton Mossabauer source technique for in situ measurement of iron bearing inclusions in natural diamonds.European Geosciences Union General Assembly 2017, Vienna April 23-28, 1p. 16340 AbstractSouth America, BrazilDeposit - Juina

Abstract: We describe a new methodology to collect energy domain Mössbauer spectra of inclusions in natural diamonds using a Synchrotron Mössbauer Source (SMS). Measurements were carried out at the Nuclear Resonance beamline ID18 at the European Synchrotron Radiation Facility (Grenoble, France). We applied this non-destructive approach to collect SMS spectra of a ferropericlase inclusion still contained within its diamond host from Juina (Brazil). The high spatial resolution of the measurement (~ 15 ?m) enabled multiple regions of the 190 × 105 ?m2 inclusion to be sampled and showed that while Fe3 +/Fetot values in ferropericlase were below the detection limit (0.02) overall, there was a magnetic component whose abundance varied systematically across the inclusion. Hyperfine parameters of the magnetic component are consistent with magnesioferrite, and the absence of superparamagnetism allows the minimum particle size to be estimated as ~ 30 nm. Bulk Fe3 +/Fetot values are similar to those reported for other ferropericlase inclusions from Juina, and their variation across the inclusion can provide constraints on its history.
DS201707-1349
2017
Harris, J.W.McDonald, I., Hughes, H.S.R., Butler, I.B., Harris, J.W., Muir, D.Homogenization of sulphide inclusions within diamonds: a new approach to diamond inclusion geochemistry.Geochimica et Cosmochimica Acta, available in press 23p.Africa, Botswanadeposit - Orapa

Abstract: Base metal sulphide (BMS) inclusions in diamonds provide a unique insight into the chalcophile and highly siderophile element composition of the mantle. Entombed within their diamond hosts, these provide a more robust (closed system) sample, from which to determine the trace element, Re-Os and S-isotopic compositions of the mantle than mantle xenoliths or orogenic peridotites, as they are shielded from alteration during ascent to the Earth’s crust and subsequent surface weathering. However, at temperatures below 1100 °C some BMS inclusions undergo subsolidus re-equilibration from an original monosulphide solid solution (Mss) and this causes fractionation of the major and trace elements within the inclusions. Thus to study the subjects noted above, current techniques require the entire BMS inclusion to be extracted for analyses. Unfortunately, ‘flaking’ of inclusions during break-out is a frequent occurrence and hence the risk of accidentally under-sampling a portion of the BMS inclusion is inherent in current practices. This loss may have significant implications for Re-Os isotope analyses where incomplete sampling of a Re-rich phase, such as chalcopyrite that typically occurs at the outer margins of BMS inclusions, may induce significant bias in the Re-Os and 187Os/188Os measurements and resulting model and isochron ages. We have developed a method for the homogenisation of BMS inclusions in diamond prior to their break-out from the host stone. Diamonds are heated to 1100 °C and then quenched to chemically homogenise any sulphide inclusions for both major and trace elements. Using X-ray Computed Microtomography (µCT) we determine the shape and spatial setting of multiple inclusions within a host stone and crucially show that the volume of a BMS inclusion is the same both before and after homogenisation. We show that the homogenisation process significantly reduces the inherent variability of in situ analysis when compared with unhomogenised BMS, thereby widening the scope for multiple methods for quantitative analysis, even on ‘flakes’ of single BMS inclusions. Finally we show that the trace elements present in peridotite (P-type) and eclogitic (E-type) BMS are distinct, with P-type diamonds having systematically higher total platinum-group element (particularly Os, Ir, Ru) and Te and As concentrations. These distinctions suggest that the PGE and semi-metal budgets of mantle-derived partial melts will be significantly dependent upon the type(s) and proportions of sulphides present in the mantle source.
DS201709-2030
2017
Harris, J.W.McDonald, I., Hughes, H.S.R., Butler, I.B., Harris, J.W., Muir, D.Homogenisation of sulphide inclusions within diamonds: a new approach to diamond inclusion geochemistry.Geochimica et Cosmochimica Acta, in press available, 23p.Technologydiamond inclusions

Abstract: Base metal sulphide (BMS) inclusions in diamonds provide a unique insight into the chalcophile and highly siderophile element composition of the mantle. Entombed within their diamond hosts, these provide a more robust (closed system) sample, from which to determine the trace element, Re-Os and S-isotopic compositions of the mantle than mantle xenoliths or orogenic peridotites, as they are shielded from alteration during ascent to the Earth’s crust and subsequent surface weathering. However, at temperatures below 1100 °C some BMS inclusions undergo subsolidus re-equilibration from an original monosulphide solid solution (Mss) and this causes fractionation of the major and trace elements within the inclusions. Thus to study the subjects noted above, current techniques require the entire BMS inclusion to be extracted for analyses. Unfortunately, ‘flaking’ of inclusions during break-out is a frequent occurrence and hence the risk of accidentally under-sampling a portion of the BMS inclusion is inherent in current practices. This loss may have significant implications for Re-Os isotope analyses where incomplete sampling of a Re-rich phase, such as chalcopyrite that typically occurs at the outer margins of BMS inclusions, may induce significant bias in the Re-Os and 187Os/188Os measurements and resulting model and isochron ages. We have developed a method for the homogenisation of BMS inclusions in diamond prior to their break-out from the host stone. Diamonds are heated to 1100 °C and then quenched to chemically homogenise any sulphide inclusions for both major and trace elements. Using X-ray Computed Microtomography (µCT) we determine the shape and spatial setting of multiple inclusions within a host stone and crucially show that the volume of a BMS inclusion is the same both before and after homogenisation. We show that the homogenisation process significantly reduces the inherent variability of in situ analysis when compared with unhomogenised BMS, thereby widening the scope for multiple methods for quantitative analysis, even on ‘flakes’ of single BMS inclusions. Finally we show that the trace elements present in peridotite (P-type) and eclogitic (E-type) BMS are distinct, with P-type diamonds having systematically higher total platinum-group element (particularly Os, Ir, Ru) and Te and As concentrations. These distinctions suggest that the PGE and semi-metal budgets of mantle-derived partial melts will be significantly dependent upon the type(s) and proportions of sulphides present in the mantle source.
DS201709-2058
2017
Harris, J.W.Stachel, T., Harris, J.W., Hunt, L., Muehlenbachs, K., Kobussen, A., EIMFArgyle diamonds - how subduction along the Kimberley Craton edge generated the World's biggest diamond deposit.Economic Geology, 50p. By permission of authorAustraliadeposit - Argyle

Abstract: Based on the mineral inclusion content, diamonds from the Argyle Mine, Western Australia, derive primarily (~90%) from eclogitic sources with a minor peridotitic contribution from both harzburgitic and lherzolitic lithologies. The eclogitic inclusions cover a large compositional range and show in part unusually high concentrations of mantle incompatible elements (P, Ti, Na and K). Coherent trends in major elements (e.g., of Ti or Na versus Mg-number) suggest that the eclogitic diamond source was created by a single process, namely igneous fractionation. Calculated bulk rock REEN patterns match a section of oceanic crust reaching from lavas and sheeted dykes to upper gabbros. Positive Eu anomalies for garnet and clinopyroxene, with calculated bulk rock REEN patterns similar to upper (non-layered) gabbros, are strong evidence for plagioclase accumulation, which is characteristic for the gabbroic portions of oceanic crust. Linking previously published oxygen isotope analyses of eclogitic garnet inclusions with their major element composition reveals a correlation between ?18O (mean of +7.2‰) and Na content, consistent with coupled 18O and Na enrichment during low temperature alteration of oceanic crust. The carbon isotopic composition of Argyle eclogitic diamonds forms a normal distribution around a ?13C value of -11‰, indicative of mixing and homogenization of mantle and crustal (organic matter) derived carbon prior to diamond precipitation. Previously published noble gas data on Argyle diamonds support this two component model. Inclusion and nitrogen-in-diamond based thermometry indicate an unusually hot origin of the eclogitic diamond suite, indicative of derivation from the lowermost 25 km (about 180-205 km depth) of the local lithospheric mantle. This is consistent with emplacement of an oceanic protolith during subduction along the Kimberley Craton margin, likely during the Halls Creek Orogeny (about 1.85 Ga). For Argyle eclogitic diamonds the relationship between the rate of platelet degradation and mantle residence temperature indicates that both temperature and strain play an important role in this process. Therefore, ubiquitous platelet degradation and plastic deformation of Argyle diamonds are consistent with derivation from a high temperature environment (softening the diamond lattice) close to the lithosphere-asthenosphere boundary (inducing strain). In combination, the Argyle data set represents a uniquely strong case for a subduction origin of an eclogitic diamond source followed by mixing of mantle and crustal components during diamond formation. Some lherzolitic inclusions show a similarity in incompatible element enrichments (elevated P, Na and K) to the eclogitic suite. The presence of a mildly majoritic lherzolitic garnet further supports a link to eclogitic diamond formation, as very similar majoritic components were found in two eclogitic garnet inclusions. The carbon isotopic composition of peridotitic diamonds shows a mode between -5 to -4 ‰ and a tail extending towards the eclogitic mode (-11 ‰). This suggests the presence of multiple generations of peridotitic diamonds, with indications for an origin linked to the eclogitic suite being restricted to diamonds of lherzolitic paragenesis. Argyle diamonds – how subduction along the Kimberley Craton edge generated the world's biggest diamond deposit.
DS201710-2235
2017
Harris, J.W.Koornneef, J.M., Gress, M.U., Chinn, I.L., Jelsma, H.A., Harris, J.W., Davies, G.R.Archaean and Proterozoic diamond growth from contrasting styles of large scale magmatism.Nature Communications, Vol. 8, 10.1038/s41467-017-00564-xAfrica, South Africadiamond inclusions

Abstract: Precise dating of diamond growth is required to understand the interior workings of the early Earth and the deep carbon cycle. Here we report Sm-Nd isotope data from 26 individual garnet inclusions from 26 harzburgitic diamonds from Venetia, South Africa. Garnet inclusions and host diamonds comprise two compositional suites formed under markedly different conditions and define two isochrons, one Archaean (2.95?Ga) and one Proterozoic (1.15?Ga). The Archaean diamond suite formed from relatively cool fluid-dominated metasomatism during rifting of the southern shelf of the Zimbabwe Craton. The 1.8 billion years younger Proterozoic diamond suite formed by melt-dominated metasomatism related to the 1.1?Ga Umkondo Large Igneous Province. The results demonstrate that resolving the time of diamond growth events requires dating of individual inclusions, and that there was a major change in the magmatic processes responsible for harzburgitic diamond formation beneath Venetia from the Archaean to the Proterozoic.
DS201710-2246
2017
Harris, J.W.McDonald, I., Hughes, H.S.R., Butler, I.B., Harris, J.W., Muir, D.Homogenization of sulphide inclusions within diamonds: a new approach to diamond inclusion geochemistry.Geochimica et Cosmochimica Acta, Vol. 216, pp. 335-357.Technologydiamond inclusions - microtomography

Abstract: Base metal sulphide (BMS) inclusions in diamonds provide a unique insight into the chalcophile and highly siderophile element composition of the mantle. Entombed within their diamond hosts, these provide a more robust (closed system) sample, from which to determine the trace element, Re-Os and S-isotopic compositions of the mantle than mantle xenoliths or orogenic peridotites, as they are shielded from alteration during ascent to the Earth’s crust and subsequent surface weathering. However, at temperatures below 1100 °C some BMS inclusions undergo subsolidus re-equilibration from an original monosulphide solid solution (Mss) and this causes fractionation of the major and trace elements within the inclusions. Thus to study the subjects noted above, current techniques require the entire BMS inclusion to be extracted for analyses. Unfortunately, ‘flaking’ of inclusions during break-out is a frequent occurrence and hence the risk of accidentally under-sampling a portion of the BMS inclusion is inherent in current practices. This loss may have significant implications for Re-Os isotope analyses where incomplete sampling of a Re-rich phase, such as chalcopyrite that typically occurs at the outer margins of BMS inclusions, may induce significant bias in the Re-Os and 187Os/188Os measurements and resulting model and isochron ages. We have developed a method for the homogenisation of BMS inclusions in diamond prior to their break-out from the host stone. Diamonds are heated to 1100 °C and then quenched to chemically homogenise any sulphide inclusions for both major and trace elements. Using X-ray Computed Microtomography (µCT) we determine the shape and spatial setting of multiple inclusions within a host stone and crucially show that the volume of a BMS inclusion is the same both before and after homogenisation. We show that the homogenisation process significantly reduces the inherent variability of in situ analysis when compared with unhomogenised BMS, thereby widening the scope for multiple methods for quantitative analysis, even on ‘flakes’ of single BMS inclusions. Finally we show that the trace elements present in peridotite (P-type) and eclogitic (E-type) BMS are distinct, with P-type diamonds having systematically higher total platinum-group element (particularly Os, Ir, Ru) and Te and As concentrations. These distinctions suggest that the PGE and semi-metal budgets of mantle-derived partial melts will be significantly dependent upon the type(s) and proportions of sulphides present in the mantle source.
DS201804-0699
2018
Harris, J.W.Harris, J.W.A history of diamond.4th International Diamond School: Diamonds, Geology, Gemology and Exploration Bressanone Italy Jan. 29-Feb. 2nd., pp. 21-24. abstractGlobalhistory
DS201805-0982
2018
Harris, J.W.Timmerman, S., Jaques, A.L., Weiss, Y., Harris, J.W.N delta 13 inclusion profiles of cloudy diamonds from Koffiefontein: evidence for formation by continuous Rayleigh fractionation and multiple fluids.Chemical Geology, Vol. 483, pp. 31-46.Africa, South Africadeposit - Koffiefontein
DS201805-0992
2018
Harris, J.W.Weiss, Y., Navon, O., Goldstein, S.L., Harris, J.W.Inclusions in diamonds constrain thermo-chemical conditions during Mesozoic metasomatism of the Kaapvaal cratonic mantle.Earth Planetary Science Letters, Vol. 491, pp. 134-147.Africa, South Africadeposit - De Beers-Pool

Abstract: Fluid/melt inclusions in diamonds, which were encapsulated during a metasomatic event and over a short period of time, are isolated from their surrounding mantle, offering the opportunity to constrain changes in the sub-continental lithospheric mantle (SCLM) that occurred during individual thermo-chemical events, as well as the composition of the fluids involved and their sources. We have analyzed a suite of 8 microinclusion-bearing diamonds from the Group I De Beers Pool kimberlites, South Africa, using FTIR, EPMA and LA-ICP-MS. Seven of the diamonds trapped incompatible-element-enriched saline high density fluids (HDFs), carry peridotitic mineral microinclusions, and substitutional nitrogen almost exclusively in A-centers. This low-aggregation state of nitrogen indicates a short mantle residence times and/or low mantle ambient temperature for these diamonds. A short residence time is favored because, elevated thermal conditions prevailed in the South African lithosphere during and following the Karoo flood basalt volcanism at ?180 Ma, thus the saline metasomatism must have occurred close to the time of kimberlite eruptions at ?85 Ma. Another diamond encapsulated incompatible-element-enriched silicic HDFs and has 25% of its nitrogen content residing in B-centers, implying formation during an earlier and different metasomatic event that likely relates to the Karoo magmatism at ca. 180 Ma. Thermometry of mineral microinclusions in the diamonds carrying saline HDFs, based on Mg-Fe exchange between garnet-orthopyroxene (Opx)/clinopyroxene (Cpx)/olivine and the Opx-Cpx thermometer, yield temperatures between 875-1080?°C at 5 GPa. These temperatures overlap with conditions recorded by touching inclusion pairs in diamonds from the De Beers Pool kimberlites, which represent the mantle ambient conditions just before eruption, and are altogether lower by 150-250?°C compared to P-T gradients recorded by peridotite xenoliths from the same locality. Oxygen fugacity differs as well. The calculated for the saline HDF compositions (to ?1.34) are higher by about a log unit compared with that recorded by xenoliths at 4-7 GPa. We conclude that enriched saline HDFs mediated the metasomatism that preceded Group I kimberlite eruptions in the southwestern Kaapvaal craton, and that their ‘cold and oxidized’ nature reflects their derivation from a deep subducting slab. This event had little impact on the temperature and redox state of the Kaapvaal lithosphere as a reservoir, however, it likely affected its properties along limited metasomatized veins and their wall rock. To reconcile the temperature and oxygen fugacity discrepancy between inclusions in diamonds and xenoliths, we argue that xenoliths did not equilibrate during the last saline metasomatic event or kimberlite eruption. Thus the P-T-gradients they record express pre-existing lithospheric conditions that were likely established during the last major thermal event in the Kaapvaal craton (i.e. the Karoo magmatism at ca. 180 Ma).
DS201806-1233
2018
Harris, J.W.Koornneef, J.M., Berndsen, M., Hageman, L., Gress, M.U., Timmerman, S., Nikogosian, I., van Bergen, M.J., Chinn, I.L., Harris, J.W., Davies, G.R.Melt and mineral inclusions as messengers of volatile recycling in space and time. ( olivine hosted inclusions)Geophysical Research Abstracts www.researchgate.net, Vol. 20, EGU2018-128291p. AbstractAfrica, South Africadiamond inclusions

Abstract: Changing recycling budgets of surface materials and volatiles by subduction of tectonic plates influence the compositions of Earth’s major reservoirs and affect climate throughout geological time. Fluids play a key role in processes governing subduction recycling, but quantifying the exact fate of volatiles introduced into the mantle at ancient and recent destructive plate boundaries remains difficult. Here, we report on the role of fluids and the fate of volatiles and other elements at two very different tectonic settings: 1) at subduction settings, and 2) within the subcontinental lithospheric mantle (SCLM). We will show how olivine-hosted melt inclusions from subduction zones and mineral inclusions in diamond from the SCLM are used to reveal how changing tectonic settings influence volatile cycles with time. Melt inclusions from the complex Italian post-collisional tectonic setting are used to identify changing subduction recycling through time. The use of CO2 in deeply trapped melt inclusions instead of in lavas or volcanic gases provides a direct estimate of deep recycling, minimizing possible effects of contamination during transfer through the crust. The aim is to distinguish if increased recycling of sediments from the down-going plate at continental subduction settings results in increased deep CO2 recycling or if the increased CO2 flux results from crustal degassing of the overriding plate. Both processes likely affected climate through Earth history but could thus far not be discriminated. The study of mineral inclusions and their host diamonds from the SCLM can link changes in the cycling of carbon-rich fluids and the time and process through which the carbon redistribution took place. We use Sm-Nd isotope techniques to date the mineral inclusions and use the carbon isotope data of the host diamonds to investigate the growth conditions. I will present case-studies of peridotitic and eclogitic diamonds from three mines in Southern Africa.
DS201806-1248
2018
Harris, J.W.Seitz, H-M., Brey, G.P., Harris, J.W., Durali-Muller, S., Ludwig, T., Hofer, H.E.Ferropericlase inclusions in ultradeep diamonds from Sao Luiz ( Brazil): high Li abundances and diverse Li-isotope and trace element compositions suggest an origin from a subduction melange.Mineralogy and Petrology, in press available, 10p.South America, Brazil, Juinadeposit - Sao Luiz

Abstract: The most remarkable feature of the inclusion suite in ultradeep alluvial and kimberlitic diamonds from Sao Luiz (Juina area in Brazil) is the enormous range in Mg# [100xMg/(Mg?+?Fe)] of the ferropericlases (fper). The Mg-richer ferropericlases are from the boundary to the lower mantle or from the lower mantle itself when they coexist with ringwoodite or Mg- perovskite (bridgmanite). This, however, is not an explanation for the more Fe-rich members and a lowermost mantle or a “D” layer origin has been proposed for them. Such a suggested ultra-deep origin separates the Fe-rich fper-bearing diamonds from the rest of the Sao Luiz ultradeep diamond inclusion suite, which also contains Ca-rich phases. These are now thought to have an origin in the uppermost lower mantle and in the transition zone and to belong either to a peridotitic or mafic (subducted oceanic crust) protolith lithology. We analysed a new set of more Fe-rich ferropericlase inclusions from 10 Sao Luiz ultradeep alluvial diamonds for their Li isotope composition by solution MC-ICP-MS (multi collector inductively coupled plasma mass spectrometry), their major and minor elements by EPMA (electron probe micro-analyser) and their Li-contents by SIMS (secondary ion mass spectrometry), with the aim to understand the origin of the ferropericlase protoliths. Our new data confirm the wide range of ferropericlase Mg# that were reported before and augment the known lack of correlation between major and minor elements. Four pooled ferropericlase inclusions from four diamonds provided sufficient material to determine for the first time their Li isotope composition, which ranges from ?7Li?+?9.6 ‰ to ?3.9 ‰. This wide Li isotopic range encompasses that of serpentinized ocean floor peridotites including rodingites and ophicarbonates, fresh and altered MORB (mid ocean ridge basalt), seafloor sediments and of eclogites. This large range in Li isotopic composition, up to 5 times higher than ‘primitive upper mantle’ Li-abundances, and an extremely large and incoherent range in Mg# and Cr, Ni, Mn, Na contents in the ferropericlase inclusions suggests that their protoliths were members of the above lithologies. This mélange of altered rocks originally contained a variety of carbonates (calcite, magnesite, dolomite, siderite) and brucite as the secondary products in veins and as patches and Ca-rich members like rodingites and ophicarbonates. Dehydration and redox reactions during or after deep subduction into the transition zone and the upper parts of the lower mantle led to the formation of diamond and ferropericlase inclusions with variable compositions and a predominance of the Ca-rich, high-pressure silicate inclusions. We suggest that the latter originated from peridotites, mafic rocks and sedimentary rocks as redox products between calcite and SiO2.
DS201807-1518
2018
Harris, J.W.Navon, O., Stachel, T., Stern, R.A., Harris, J.W.Carbon and nitrogen systematics in nitrogen-rich, ultradeep diamonds from Sao Luiz, Brazil.Mineralogy and Petrology, 10.1007/ s710-018-0576 -9, 10p.South America, Brazildeposit - Sao Luiz

Abstract: Three diamonds from Sao Luiz, Brazil carrying nano- and micro-inclusions of molecular ?-N2 that exsolved at the base of the transition zone were studied for their C and N isotopic composition and the concentration of N utilizing SIMS. The diamonds are individually uniform in their C isotopic composition and most spot analyses yield ?13C values of ?3.2?±?0.1‰ (ON-SLZ-390) and???4.7?±?0.1‰ (ON-SLZ-391 and 392). Only a few analyses deviate from these tight ranges and all fall within the main mantle range of ?5?±?3‰. Most of the N isotope analyses also have typical mantle ?15N values (?6.6?±?0.4‰, ?3.6?±?0.5‰ and???4.1?±?0.6‰ for ON-SLZ-390, 391 and 392, respectively) and are associated with high N concentrations of 800-1250 atomic ppm. However, some N isotopic ratios, associated with low N concentrations (<400 ppm) and narrow zones with bright luminescence are distinctly above the average, reaching positive ?15N values. These sharp fluctuations cannot be attributed to fractionation. They may reflect arrival of new small pulses of melt or fluid that evolved under different conditions. Alternatively, they may result from fractionation between different growth directions, so that distinct ?15N values and N concentrations may form during diamond growth from a single melt/fluid. Other more continuous variations, in the core of ON-SLZ-390 or the rim of ON-SLZ-392 may be the result of Rayleigh fractionation or mixing.
DS201807-1523
2018
Harris, J.W.Phillips, D., Harris, J.W., de Wit, M.C.J., Matchan, E.L.Provenance history of detrital diamond deposits, West Coast of Namaqualand, South Africa.Mineralogy and Petrology, 10.1007/ s00710-018- 0568-9, 15p.Africa, South Africageochronology

Abstract: The West Coast of Namaqualand in South Africa hosts extensive detrital diamond deposits, but considerable debate exists as to the provenance of these diamonds. Some researchers have suggested derivation of the diamonds from Cretaceous-Jurassic kimberlites (also termed Group I kimberlites) and orangeites (also termed Group II kimberlites) located on the Kaapvaal Craton. However, others favour erosion of diamonds from the ca.300 Ma Dwyka Group sediments, with older, pre-Karoo kimberlites being the original source(s). Previous work has demonstrated that 40Ar/39Ar analyses of clinopyroxene inclusions, extracted from diamonds, yield ages approaching the time(s) of source kimberlite emplacement, which can be used to constrain the provenance of placer diamond deposits. In the current study, 40Ar/39Ar analyses were conducted on clinopyroxene inclusions from two similar batches of Namaqualand detrital diamonds, yielding (maximum) ages ranging from 117.5?±?43.6 Ma to 3684?±?191 Ma (2?) and 120.6?±?15.4 Ma to 688.8?±?4.9 Ma (2?), respectively. The vast majority of inclusions (88%) produced ages younger than 500 Ma, indicating that most Namaqualand diamonds originated from Cretaceous-Jurassic kimberlites/orangeites, with few, if any, derived from the Dwyka tillites. The provenance of the Namaqualand diamonds from ca.115-200 Ma orangeites is consistent with Late Cretaceous paleo-drainage reconstructions, as these localities could have been sampled by the ‘paleo-Karoo’ River and transported to the West Coast via an outlet close to the current Olifants River mouth. At ca.90 Ma, this drainage system appears to have been captured by the ‘paleo-Kalahari’ River, a precursor to the modern Orange River system. This latter drainage is considered to have transported diamonds eroded from both ca.80-90 Ma kimberlites and ca.115-200 Ma orangeites to the West Coast, which were subsequently reworked along the Namibian coast, forming additional placer deposits.
DS201807-1532
2018
Harris, J.W.Timmerman, S., Honda, M., Phillips, D., Jaques, A.L., Harris, J.W.Noble gas geochemistry of fluid inclusions in South Africa diamonds: implications for the origin of diamond forming fluids. ( fibrous)Mineralogy and Petrology, 10.1007/ s710-018- 0603-x 15p.Africa, South Africadeposit - Finsch, De Beers Pool, Koffiefontein

Abstract: Fibrous diamond growth zones often contain abundant high-density fluid (HDF) inclusions and these provide the most direct information on diamond-forming fluids. Noble gases are incompatible elements and particularly useful in evaluating large-scale mantle processes. This study further constrains the evolution and origin of the HDFs by combining noble gas systematics with ?¹³C, N concentrations, and fluid inclusion compositions for 21 individual growth zones in 13 diamonds from the Finsch (n = 3), DeBeers Pool (n = 7), and Koffiefontein (n = 3) mines on the Kaapvaal Craton. C isotope compositions range from ?2.8 to ?8.6‰ and N contents vary between 268 and 867 at.ppm, except for one diamond with contents of <30 at.ppm N. Nine of the thirteen studied diamonds contained saline HDF inclusions, but the other four diamonds had carbonatitic or silicic HDF inclusions. Carbonatitic and silicic HDFs yielded low He concentrations, R/Ra (³He/?Hesample/³He/?Heair) values of 3.2–6.7, and low ??Ar/³?Ar ratios of 390–1940. Noble gas characteristics of carbonatitic-silicic HDFs appear consistent with a subducted sediment origin and interaction with eclogite. Saline HDFs are characterised by high He concentrations, with R/Ra mostly between 3.9 and 5.7, and a wide range in ??Ar/³?Ar ratios (389–30,200). The saline HDFs likely originated from subducted oceanic crust with low He but moderate Ar contents. Subsequent interaction of these saline HDFs with mantle peridotite could explain the increase in He concentrations and mantle-like He isotope composition, with the range in low to high ??Ar/³?Ar ratios dependent on the initial ³?Ar content and extent of lithosphere interaction. The observed negative correlation between ?He contents and R/Ra values in saline HDFs indicates significant in situ radiogenic ?He production. Noble gas geochemistry of fluid inclusions in South African diamonds: implications for the origin of diamond-forming fluids.
DS201808-1769
2018
Harris, J.W.Motsamai, T., Harris, J.W., Stachel, T., Pearson, D.G., Armstrong, J.Mineral inclusions in diamonds from Karowe mine, Botswana: super-deep sources for super-sized diamonds?Mineralogy and Petrology, doi.org/10.1007/s00710-018-0604-9 12p.Africa, Botswanadeposit - Karowe

Abstract: Mineral inclusions in diamonds play a critical role in constraining the relationship between diamonds and mantle lithologies. Here we report the first major and trace element study of mineral inclusions in diamonds from the Karowe Mine in north-east Botswana, along the western edge of the Zimbabwe Craton. From a total of 107 diamonds, 134 silicate, 15 oxide, and 22 sulphide inclusions were recovered. The results reveal that 53% of Karowe inclusion-bearing diamonds derived from eclogitic sources, 44% are peridotitic, 2% have a sublithospheric origin, and 1% are websteritic. The dominant eclogitic diamond substrates sampled at Karowe are compositionally heterogeneous, as reflected in wide ranges in the CaO contents (4-16 wt%) of garnets and the Mg# (69-92) and jadeite contents (14-48 mol%) of clinopyroxenes. Calculated bulk rock REEN patterns indicate that both shallow and deep levels of the subducted slab(s) were sampled, including cumulate-like protoliths. Peridotitic garnet compositions largely derive from harzburgite/dunite substrates (~90%), with almost half the garnets having CaO contents <1.8 wt%, consistent with pyroxene-free (dunitic) sources. The highly depleted character of the peridotitic diamond substrates is further documented by the high mean and median Mg# (93.1) of olivine inclusions. One low-Ca garnet records a very high Cr2O3 content (14.7 wt%), implying that highly depleted cratonic lithosphere at the time of diamond formation extended to at least 220 km depth. Inclusion geothermobarometry indicates that the formation of peridotitic diamonds occurred along a 39-40 mW/m2 model geotherm. A sublithospheric inclusion suite is established by three eclogitic garnets containing a majorite component, a feature so far unique within the Orapa cluster. These low- and high-Ca majoritic garnets follow pyroxenitic and eclogitic trends of majoritic substitution, respectively. The origin of the majorite-bearing diamonds is estimated to be between 330 to 420 km depth, straddling the asthenosphere-transition zone boundary. This new observation of superdeep mineral inclusions in Karowe diamonds is consistent with a sublithospheric origin for the exceptionally large diamonds from this mine.
DS201809-2038
2018
Harris, J.W.Howell, D., Stachel, T., Pearson, D.G., Stern, R.A., Nestola, F., Shirey, S.B., Harris, J.W.Deep carbon through time: the diamond record.Goldschmidt Conference, 1p. AbstractAfrica, Australia, Russia, Canadadeposit - Argyle, De Beers Pool, Jwaneng, Orapa, Udachnaya, Venetia, Wawa, Diavik

Abstract: Earth’s mantle is by far the largest silicate-hosted reservoir of carbon. Diamonds are unrivalled in their ability to record the cycle of mantle carbon and other volatiles over a vast portion of the Earth’s history. They are the product of ascending, cooling, carbon-saturated, metasomatic fluidsmelts and/or redox reactions, predominantly within peridotitic and eclogitic domains in the mantle lithosphere. This paper reports the results of a major secondary ion mass spectrometry (SIMS) carbon isotope study, carried out on 127 diamond samples, spanning a large range of geological time. Detailed transects across the incremental growth zones within each diamond were measured for C isotopes, N abundances and, for samples with N >~200 at.ppm, N isotopes. Given that all of the samples are fragments, recovered when the original crystals were broken to liberate their inclusions, 81 of the analytical traverses have confirmed growth direction context. 98 samples are from studies that have confirmed the dates of the individual diamonds through analysis of their silicate or sulphide inclusions, from source localities including Argyle, De Beers Pool, Jwaneng, Orapa, Udachnaya & Venetia. Additional samples come from Wawa (a minimum age) and Diavik where the samples are tied via inclusion paragenesis to published ages. The peridotitic dataset covers the age range of ~3.3 - 2.0 Ga, with the eclogitic data from 2.9 - 1.0 Ga. In total, 751 carbon isotope and nitrogen concentration measurements have been obtained (425 on peridotitic diamonds, and 326 on eclogitic diamonds) with 470 nitrogen isotope measurements (190 P, 280 E). We attempt to constrain the diamond carbon isotope record through time and its implications for (i) the mantle carbon reservoir, (ii) its oxygen fugacity, (iii) the fluid / melt growth environment of diamonds, (iv) fractionation trends recorded in individual diamonds, and (v) diamond population studies using bulk combustion carbon isotope analysis.
DS201809-2079
2018
Harris, J.W.Regier, M.E., Pearson, D.G., Stachel, T., Stern, R.A., Harris, J.W.Oxygen isotopes in Kankan super deep diamond inclusions reveal variable slab mantle interaction.Goldschmidt Conference, 1p. AbstractAfrica, South Africa, Guinea, South America, Brazildeposit - Kankan, Jagersfontein, Juina

Abstract: Inclusions in super-deep diamonds provide a unique window to the sublithospheric mantle (e.g. [1-4]). Here we present oxygen isotopes for Kankan majoritic garnet and former bridgmanite inclusions. The clustering of Kankan majorites around a ?18O of +9‰ is nearly identical to those reported from Jagersfontein [1]. This elevated and nearly constant ?18O signal indicates homogenization of partial melts from the uppermost part of altered basaltic slabs. Conversely, ?18O values in Juina majorites are highly variable [2] due to crystallization from small, discrete melt pockets in a heterogeneous eclogitic source. While all these majorites have eclogitic/pyroxenitic Cr2O3 and CaO contents, charge-balance for Si[VI] is achieved very differently, with Jagersfontein [3], Kankan [4], and Juina [2] majorites transitioning from eclogitic Na[VIII]Si[VI] to peridotitic-pyroxenitic [5] Mg[VI]Si[VI] substitutions. We interpret this shift as the result of homogenized eclogitic partial melts infiltrating and reacting with adjacent pyrolitic mantle at Kankan and Jagersfontein. Increases in Mg# and Cr2O3 with reductions in ?18O support this reaction. This model is in agreement with recent experiments in which majorites and diamonds form from a reaction of slab-derived carbonatite with reduced pyrolite at 300-700 km depth [6]. The Kankan diamonds also provide an opportunity to establish the chemical environment of the lower mantle. Four inclusions of MgSiO3, inferred to be former bridgmanite [4], provide the first-measured ?18O values for lower mantle samples. These values suggest derivation from primitive mantle, or unaltered subducted oceanic lithospheric mantle. The Kankan super-deep inclusions thus provide a cross-section of deep mantle that highlights slab-pyrolite reactions in the asthenosphere and primitive compositions in the lower mantle.
DS201809-2112
2018
Harris, J.W.Weiss,Y., Navon, O.., Goldstein, S.L., Harris, J.W.Inclusions in diamonds constrain thermo-chemical conditions of the Kaapvaal cratonic mantle.Goldschmidt Conference, 1p. AbstractAfrica, South Africadeposit - De Beers Pool

Abstract: Mineral and fluid/melt inclusions in diamonds, which are encapsulated and isolated during a metasomatic event, offer the opportunity to constrain changes in the sub-continental lithospheric mantle that occurred during individual thermochemical events. Fibrous diamonds from the Group I De Beers Pool kimberlites, South Africa (SA), trapped incompatibleelement enriched saline high-density fluids (HDFs) and peridotitic mineral microinclusions. Their substitutional nitrogen resides almost exclusively in A-centers. With regard to the elevated thermal conditions that prevailed in the SA lithosphere during and following Karoo volcanism at ~180 Ma, this low-aggregation state of nitrogen suggests a short mantle residence time, constraining the time of saline metasomatism to be close to the eruption of the kimberlites at ~85 Ma. Thermometry of mineral microinclusions yield temperatures between 875-1080 ºC (at 5 GPa). These temperatures overlap with conditions recorded by touching inclusion pairs, which represent the mantle ambient conditions just before eruption, and are altogether lower by 150-250°C compared to P-T gradients recorded by peridotite xenoliths from the same locality. In addition, the oxygen fugacity calculated for the saline HDF compositions (?log??O2(FMQ) = -2.5 to -1.3) are higher by about a log unit compared with that recorded by xenoliths at 4-7 GPa. We conclude that enriched saline HDFs mediated the metasomatism that preceded Group I kimberlite eruptions in the southwestern Kaapvaal craton, and that their ‘cold and oxidized’ nature reflects their derivation from a deep subducting slab. To reconcile the temperature and oxygen fugacity discrepancy between inclusions in diamonds and xenoliths, we argue that xenoliths did not equilibrate during the last saline metasomatic event or kimberlite eruption. Thus the P-T-??O2 gradients they record express pre-existing lithospheric conditions that were likely established during the last major thermal event in the Kaapvaal craton (i.e. the Karoo magmatism at ca. 180 Ma).
DS201810-2366
2018
Harris, J.W.Phillips, D., Harris, J.W., de Wit, M.C.J., Matchan, E.Provenance history of detrital diamond deposits, West Coast of Namaqualand, South Africa.Mineralogy and Petrology, doi:10.1007/ s00710-018-0568-9 15p.Africa, South Africadeposit - Group I, orangeites Group II

Abstract: The West Coast of Namaqualand in South Africa hosts extensive detrital diamond deposits, but considerable debate exists as to the provenance of these diamonds. Some researchers have suggested derivation of the diamonds from Cretaceous-Jurassic kimberlites (also termed Group I kimberlites) and orangeites (also termed Group II kimberlites) located on the Kaapvaal Craton. However, others favour erosion of diamonds from the ca.300 Ma Dwyka Group sediments, with older, pre-Karoo kimberlites being the original source(s). Previous work has demonstrated that 40Ar/39Ar analyses of clinopyroxene inclusions, extracted from diamonds, yield ages approaching the time(s) of source kimberlite emplacement, which can be used to constrain the provenance of placer diamond deposits. In the current study, 40Ar/39Ar analyses were conducted on clinopyroxene inclusions from two similar batches of Namaqualand detrital diamonds, yielding (maximum) ages ranging from 117.5?±?43.6 Ma to 3684?±?191 Ma (2s) and 120.6?±?15.4 Ma to 688.8?±?4.9 Ma (2s), respectively. The vast majority of inclusions (88%) produced ages younger than 500 Ma, indicating that most Namaqualand diamonds originated from Cretaceous-Jurassic kimberlites/orangeites, with few, if any, derived from the Dwyka tillites. The provenance of the Namaqualand diamonds from ca.115-200 Ma orangeites is consistent with Late Cretaceous paleo-drainage reconstructions, as these localities could have been sampled by the ‘paleo-Karoo’ River and transported to the West Coast via an outlet close to the current Olifants River mouth. At ca.90 Ma, this drainage system appears to have been captured by the ‘paleo-Kalahari’ River, a precursor to the modern Orange River system. This latter drainage is considered to have transported diamonds eroded from both ca.80-90 Ma kimberlites and ca.115-200 Ma orangeites to the West Coast, which were subsequently reworked along the Namibian coast, forming additional placer deposits.
DS201812-2887
2018
Harris, J.W.Stachel, T., Harris, J.W., Hunt, L., Muehlenbachs, K., Kobussen, A.F., Edinburgh Ion Micro-Probe facilityArgyle deposit: Argyle diamonds: how subduction along the Kimberley craton edge generated the world's biggest diamond deposit.Society of Economic Geology Geoscience and Exploration of the Argyle, Bunder, Diavik, and Murowa Diamond Deposits, Special Publication no. 20, pp. 145-168.Australia, western Australiadeposit - Argyle
DS201902-0285
2018
Harris, J.W.Kiseeva, E.S., Vasiukov, D.M., Wood, B.J., McCammon, C., Stachel, T., Bykov, M., Bykova, E., Chumakov, A., Cerantola, V., Harris, J.W., Dubrovinsky, L.Oxidized iron in garnets from the mantle transition zone.Nature Geoscience, Vol. 11, pp. 144-147. Africa, South Africadeposit - Jagersfontein

Abstract: The oxidation state of iron in Earth’s mantle is well known to depths of approximately 200?km, but has not been characterized in samples from the lowermost upper mantle (200-410?km depth) or the transition zone (410-660?km depth). Natural samples from the deep (>200?km) mantle are extremely rare, and are usually only found as inclusions in diamonds. Here we use synchrotron Mössbauer source spectroscopy complemented by single-crystal X-ray diffraction to measure the oxidation state of Fe in inclusions of ultra-high pressure majoritic garnet in diamond. The garnets show a pronounced increase in oxidation state with depth, with Fe3+/(Fe3++ Fe2+) increasing from 0.08 at approximately 240?km depth to 0.30 at approximately 500?km depth. The latter majorites, which come from pyroxenitic bulk compositions, are twice as rich in Fe3+ as the most oxidized garnets from the shallow mantle. Corresponding oxygen fugacities are above the upper stability limit of Fe metal. This implies that the increase in oxidation state is unconnected to disproportionation of Fe2+ to Fe3+ plus Fe0. Instead, the Fe3+ increase with depth is consistent with the hypothesis that carbonated fluids or melts are the oxidizing agents responsible for the high Fe3+ contents of the inclusions.
DS201904-0714
2019
Harris, J.W.Anzolini, C., Nestola, F., Mazzucchelli, M.L., Alvaro, M., Nimis, P., Gianese, A., Morganti, S., Marone, F., Campione, M., Hutchison, M.T., Harris, J.W.Depth of diamond formation obtained from single periclase inclusions. SDD ( Super Deep Diamonds)Geology , Vol. 47, 3, pp. 219-222.South America, Brazil, Guyanadiamond genesis

Abstract: Super-deep diamonds (SDDs) are those that form at depths between ?300 and ?1000 km in Earth’s mantle. They compose only 1% of the entire diamond population but play a pivotal role in geology, as they represent the deepest direct samples from the interior of our planet. Ferropericlase, (Mg,Fe)O, is the most abundant mineral found as inclusions in SDDs and, when associated with low-Ni enstatite, which is interpreted as retrogressed bridgmanite, is considered proof of a lower-mantle origin. As this mineral association in diamond is very rare, the depth of formation of most ferropericlase inclusions remains uncertain. Here we report geobarometric estimates based on both elasticity and elastoplasticity theories for two ferropericlase inclusions, not associated with enstatite, from a single Brazilian diamond. We obtained a minimum depth of entrapment of 15.7 (±2.5) GPa at 1830 (±45) K (?450 [±70] km depth), placing the origin of the diamond-inclusion pairs at least near the upper mantle-transition zone boundary and confirming their super-deep origin. Our analytical approach can be applied to any type of mineral inclusion in diamond and is expected to allow better insights into the depth distribution and origin of SDDs.
DS201905-1062
2019
Harris, J.W.Nestola, F., Jacob, D.E., Pamato, M.G., Pasqualatto, L., Oliveira, B., Greene, S., Perritt, S., Chinn, I., Milani, S., Kueter, N., Sgreva, N., Nimis, P., Secco, L., Harris, J.W.Protogenetic garnet inclusions and the age of diamonds.Geology, doi.10.1130/G45781.1Mantlediamond inclusions

Abstract: Diamonds are the deepest accessible “fragments” of Earth, providing records of deep geological processes. Absolute ages for diamond formation are crucial to place these records in the correct time context. Diamond ages are typically determined by dating inclusions, assuming that they were formed simultaneously with their hosts. One of the most widely used mineral inclusions for dating diamond is garnet, which is amenable to Sm-Nd geochronology and is common in lithospheric diamonds. By investigating worldwide garnet-bearing diamonds, we provide crystallographic evidence that garnet inclusions that were previously considered to be syngenetic may instead be protogenetic, i.e., they were formed before the host diamond, raising doubts about the real significance of many reported diamond “ages.” Diffusion modeling at relevant pressures and temperatures, however, demonstrates that isotopic resetting would generally occur over geologically short time scales. Therefore, despite protogenicity, the majority of garnet-based ages should effectively correspond to the time of diamond formation. On the other hand, our results indicate that use of large garnet inclusions (e.g., >100 ?m) and diamond hosts formed at temperatures lower than ?1000 °C is not recommended for diamond age determinations.
DS201905-1063
2019
Harris, J.W.Nimis, P., Angel, R.J., Alvaro, M., Nestola, F., Harris, J.W., Casati, N., Marone, F.Crystallographic orientations of magnesiochromite inclusions in diamonds: what do they tell us?Contributions to Mineralogy and Petrology, Vol. 174, p. 29- 13p.Russia, Siberiadeposit - Udachnaya

Abstract: We have studied by X-ray diffractometry the crystallographic orientation relationships (CORs) between magnesiochromite (mchr) inclusions and their diamond hosts in gem-quality stones from the mines Udachnaya (Siberian Russia), Damtshaa (Botswana) and Panda (Canada); in total 36 inclusions in 23 diamonds. In nearly half of the cases (n?=?17), [111]mchr is parallel within error to [111]diamond, but the angular misorientation for other crystallographic directions is generally significant. This relationship can be described as a case of rotational statistical COR, in which inclusion and host share a single axis (1 df). The remaining mchr-diamond pairs (n?=?19) have a random COR (2 df). The presence of a rotational statistical COR indicates that the inclusions have physically interacted with the diamond before their final incorporation. Of all possible physical processes that may have influenced mchr orientation, those driven by surface interactions are not considered likely because of the presence of fluid films around the inclusions. Mechanical interaction between euhedral crystals in a fluid-rich environment is therefore proposed as the most likely mechanism to produce the observed rotational COR. In this scenario, neither a rotational nor a random COR can provide information on the relative timing of growth of mchr and diamond. Some multiple, iso-oriented inclusions within single diamonds, however, indicate that mchr was partially dissolved during diamond growth, suggesting a protogenetic origin of these inclusions.
DS201905-1081
2019
Harris, J.W.Timmerman, S., Jaques, A.L., Weiss, Y., Harris, J.W.N delta 13 C - inclusion profiles of cloudy diamonds from Koffiefontein: evidence for formation by continuous Rayleigh fractionation and multiple fluids.Chemical Geology, Vol. 483, pp. 31-46.Africa, South Africadeposit - Koffiefontein

Abstract: Six diamonds with a fibrous core, intermediate zone and monocrystalline outer zone (“cloudy diamonds”) from the Koffiefontein mine, South Africa, were investigated for N concentrations, carbon isotope compositions and micro-inclusion compositions along core to rim traverses. This study evaluates the nature of the change from fibrous to gem diamond growth and the relation between major element composition of high density fluid inclusions and N ? ?¹³C in fibrous growth zones. Three diamonds contain saline to carbonatitic fluid micro-inclusions with constant or increasing carbon isotope values which are inferred to have formed by varying amounts of Rayleigh fractionation in a closed system of a carbonate-bearing fluid. Continuous N ? ?¹³C fractionation trends from the fibrous to gem growth zone in two of the diamonds and equally low nitrogen aggregation states indicate formation of diamond shortly before kimberlite eruption from a single fluid without a time gap between fibrous and gem diamond growth. High major element/CO32- ratios in the growth media resulted in a constant major element composition of the fluid inclusions found in the studied fibrous diamonds. The transition from fibrous to gem diamond growth is likely caused by the precipitation of diamond reducing the degree of oversaturation of carbon in the fluid and hence decreasing the rate of diamond growth. Two other diamonds have inclusions that change from silicate minerals in the inner fibrous growth zones towards pure saline fluid compositions in the outer fibrous growth zones. This decrease in Si, Mg and Ca and increase in K and Cl in the inclusions is accompanied by a decrease in ?¹³C values and N contents. These trends are suggested to be the result from gradually mixing in more saline fluids with lower ?¹³C values. One diamond with silicic inclusions has significant N aggregation into B-centres, suggesting this fluid is different and that diamond formation occurred significantly (e.g. 1250 °C gives ?10 Ma) before the kimberlite eruption.
DS201909-2098
2019
Harris, J.W.Timmerman, S., Honda, M., Burnham, A.D., Amelin, Y., Woodland, S., Pearson, D.G., Jaques, A.L., Le Losq, C., Bennett, V.C., Bulanova, G.P., Smith, C.B., Harris, J.W., Tohver, E.Primordial and recycled helium isotope signatures in the mantle transition zone. Science, Vol. 365, 6454, pp. 692-694.Mantlediamond genesis

Abstract: Isotope compositions of basalts provide information about the chemical reservoirs in Earth’s interior and play a critical role in defining models of Earth’s structure. However, the helium isotope signature of the mantle below depths of a few hundred kilometers has been difficult to measure directly. This information is a vital baseline for understanding helium isotopes in erupted basalts. We measured He-Sr-Pb isotope ratios in superdeep diamond fluid inclusions from the transition zone (depth of 410 to 660 kilometers) unaffected by degassing and shallow crustal contamination. We found extreme He-C-Pb-Sr isotope variability, with high 3He/4He ratios related to higher helium concentrations. This indicates that a less degassed, high-3He/4He deep mantle source infiltrates the transition zone, where it interacts with recycled material, creating the diverse compositions recorded in ocean island basalts.
DS201910-2285
2019
Harris, J.W.Meyer, N.A., Wenz, M.D., Walsh, J.P.S., Jacobsen, S.D., Locock, A.J., Harris, J.W.Goldschmidtite, ( K,REE,Sr) (Nb,Cr)03: a new perovskite supergroup mineral found in diamond from Koffiefontein, South Africa.American Mineralogist, Vol. 104, pp. 1345-1350.Africa, South Africadeposit - Koffiefontein

Abstract: Goldschmidtite is a new perovskite-group mineral (IMA No. 2018-034) with the ideal formula (K,REE,Sr)(Nb,Cr)O3. A single grain of goldschmidtite with a maximum dimension of ?100 ?m was found as an inclusion in a diamond from the Koffiefontein pipe in South Africa. In addition to the dark green and opaque goldschmidtite, the diamond contained a Cr-rich augite (websteritic paragenesis) and an intergrowth of chromite, Mg-silicate, and unidentified K-Sr-REE-Nb-oxide. Geothermobarometry of the augite indicates that the depth of formation was ?170 km. The chemical composition of gold-schmidtite determined by electron microprobe analysis (n = 11, WDS, wt%) is: Nb2O5 44.82, TiO2 0.44, ThO2 0.10, Al2O3 0.35, Cr2O3 7.07, La2O3 11.85, Ce2O3 6.18, Fe2O3 1.96, MgO 0.70, CaO 0.04, SrO 6.67, BaO 6.82, K2O 11.53, total 98.53. The empirical formula (expressed to two decimal places) is (K0.50La0.15Sr0.13Ba0.09Ce0.08)?0.95(Nb0.70Cr0.19Fe0.05Al0.01Mg0.04Ti0.01)?1.00O3. Goldschmidtite is cubic, space group Pm3m, with unit-cell parameters: a = 3.9876(1) Å, V = 63.404(6) Å3, Z = 1, resulting in a calculated density of 5.32(3) g/cm3. Goldschmidtite is the K-analog of isolueshite, (Na,La)NbO3. Raman spectra of goldschmidtite exhibit many second-order broad bands at 100 to 700 cm-1 as well as a pronounced peak at 815 cm-1, which is possibly a result of local ordering of Nb and Cr at the B site. The name goldschmidtite is in honor of the eminent geochemist Victor Moritz Goldschmidt (1888-1947), who formalized perovskite crystal chemistry and identified KNbO3 as a perovskite-structured compound.
DS201910-2288
2019
Harris, J.W.Nestola, F., Zaffiro, G., Mazzucchelli, M.L., Nimis, P., Andreozzi, G.B., Periotto, B., Princivalle, F., Lenaz, D., Secco, L., Pasqualetto, L., Logvinova, A.M., Sobolev, N.V., Lorenzetti, A., Harris, J.W.Diamond inclusion system recording old deep lithosphere conditions at Udachnaya ( Siberia).Nature Research, Vol. 9, 12586 8p. PdfRussia, Siberiadeposit - Udachnaya

Abstract: Diamonds and their inclusions are unique fragments of deep Earth, which provide rare samples from inaccessible portions of our planet. Inclusion-free diamonds cannot provide information on depth of formation, which could be crucial to understand how the carbon cycle operated in the past. Inclusions in diamonds, which remain uncorrupted over geological times, may instead provide direct records of deep Earth’s evolution. Here, we applied elastic geothermobarometry to a diamond-magnesiochromite (mchr) host-inclusion pair from the Udachnaya kimberlite (Siberia, Russia), one of the most important sources of natural diamonds. By combining X-ray diffraction and Fourier-transform infrared spectroscopy data with a new elastic model, we obtained entrapment conditions, Ptrap?=?6.5(2) GPa and Ttrap?=?1125(32)-1140(33) °C, for the mchr inclusion. These conditions fall on a ca. 35?mW/m2 geotherm and are colder than the great majority of mantle xenoliths from similar depth in the same kimberlite. Our results indicate that cold cratonic conditions persisted for billions of years to at least 200?km in the local lithosphere. The composition of the mchr also indicates that at this depth the lithosphere was, at least locally, ultra-depleted at the time of diamond formation, as opposed to the melt-metasomatized, enriched composition of most xenoliths.
DS201912-2776
2019
Harris, J.W.de Hoog, J.C.M., Tachel, T., Harris, J.W.Trace element geochemistry of diamond hosted olivine inclusions from the Akwatia mine, West African Craton: implications for diamond paragenesis and geothermobaromtry.Contributions to Mineralogy and Petrology, Vol. 174, 28p. PdfAfrica, Ghanadeposit - Akwatia

Abstract: Trace-element concentrations in olivine and coexisting garnets included in diamonds from the Akwatia Mine (Ghana, West African Craton) were measured to show that olivine can provide similar information about equilibration temperature, diamond paragenesis and mantle processes as garnet. Trace-element systematics can be used to distinguish harzburgitic olivines from lherzolite ones: if Ca/Al ratios of olivine are below the mantle lherzolite trend (Ca/Al??300 µg/g Ca or?>?60 µg/g Na are lherzolitic. Conventional geothermobarometry indicates that Akwatia diamonds formed and resided close to a 39 mW/m2 conductive geotherm. A similar value can be derived from Al in olivine geothermometry, with TAl-ol ranging from 1020 to 1325 °C. Ni in garnet temperatures is on average somewhat higher (TNi-grt?=?1115-1335 °C) and the correlation between the two thermometers is weak, which may be not only due to the large uncertainties in the calibrations, but also due to disequilibrium between inclusions from the same diamond. Calcium in olivine should not be used as a geothermobarometer for harzburgitic olivines, and often gives unrealistic P-T estimates for lherzolitic olivine as well. Diamond-hosted olivine inclusions indicate growth in an extremely depleted (low Ti, Ca, Na, high Cr#) environment with no residual clinopyroxene. They are distinct from olivines from mantle xenoliths which show higher, more variable Ti contents and lower Cr#. Hence, most olivine inclusions in Akwatia diamonds escaped the refertilisation processes that have affected most mantle xenoliths. Lherzolitic inclusions are probably the result of refertilisation after undergoing high-degree melting first. Trivalent cations appear to behave differently in harzburgitic diamond-hosted olivine inclusions than lherzolitic inclusions and olivine from mantle xenoliths. Some divalent chromium is predicted to be present in most olivine inclusions, which may explain high concentrations up to 0.16 wt% Cr2O3 observed in some diamond inclusions. Strong heterogeneity of Cr, V and Al in several inclusions may also result in apparent high Cr contents, and is probably due to late-stage processes during exhumation. However, in general, diamond-hosted olivine inclusions have lower Cr and V than expected compared to mantle xenoliths. Reduced Na activity in depleted harzburgites limits the uptake of Cr, V and Sc via Na-M3+ exchange. In contrast, Al partitioning in harzburgites is not significantly reduced compared to lherzolites, presumably due to uptake of Al in olivine by Al-Al exchange.
DS202002-0176
2019
Harris, J.W.De Hoog, J.C.M., Stachel, T., Harris, J.W.Trace element geochemistry of diamond hosted olivine inclusions from the Akwatia mine, West African Craton: implications for diamond paragenesis and geothermobarometry.Contributions to Mineralogy and Petrology, Vol. 174, (12) doi: 10.1007/s00410-019-1634-yAfrica, Ghanadeposit - Akwatia

Abstract: Trace-element concentrations in olivine and coexisting garnets included in diamonds from the Akwatia Mine (Ghana, West African Craton) were measured to show that olivine can provide similar information about equilibration temperature, diamond paragenesis and mantle processes as garnet. Trace-element systematics can be used to distinguish harzburgitic olivines from lherzolite ones: if Ca/Al ratios of olivine are below the mantle lherzolite trend (Ca/Al??300 µg/g Ca or?>?60 µg/g Na are lherzolitic. Conventional geothermobarometry indicates that Akwatia diamonds formed and resided close to a 39 mW/m2 conductive geotherm. A similar value can be derived from Al in olivine geothermometry, with TAl-ol ranging from 1020 to 1325 °C. Ni in garnet temperatures is on average somewhat higher (TNi-grt?=?1115-1335 °C) and the correlation between the two thermometers is weak, which may be not only due to the large uncertainties in the calibrations, but also due to disequilibrium between inclusions from the same diamond. Calcium in olivine should not be used as a geothermobarometer for harzburgitic olivines, and often gives unrealistic P-T estimates for lherzolitic olivine as well. Diamond-hosted olivine inclusions indicate growth in an extremely depleted (low Ti, Ca, Na, high Cr#) environment with no residual clinopyroxene. They are distinct from olivines from mantle xenoliths which show higher, more variable Ti contents and lower Cr#. Hence, most olivine inclusions in Akwatia diamonds escaped the refertilisation processes that have affected most mantle xenoliths. Lherzolitic inclusions are probably the result of refertilisation after undergoing high-degree melting first. Trivalent cations appear to behave differently in harzburgitic diamond-hosted olivine inclusions than lherzolitic inclusions and olivine from mantle xenoliths. Some divalent chromium is predicted to be present in most olivine inclusions, which may explain high concentrations up to 0.16 wt% Cr2O3 observed in some diamond inclusions. Strong heterogeneity of Cr, V and Al in several inclusions may also result in apparent high Cr contents, and is probably due to late-stage processes during exhumation. However, in general, diamond-hosted olivine inclusions have lower Cr and V than expected compared to mantle xenoliths. Reduced Na activity in depleted harzburgites limits the uptake of Cr, V and Sc via Na-M3+ exchange. In contrast, Al partitioning in harzburgites is not significantly reduced compared to lherzolites, presumably due to uptake of Al in olivine by Al-Al exchange.
DS202004-0519
2020
Harris, J.W.Howell, D., Stachel, T., Stern, R.A., Pearson, D.G., Nestola, F., Hardman, M.F., Harris, J.W., Jaques, A.L., Shirery, S.B., Cartigny, P., Smit, K.V., Aulbach, S., Brenker, F.E., Jacob, D.E., Thomassot, E., Walter, M.J., Navon, O.Deep carbon through time: Earth's diamond record and its implications for carbon cycling and fluid speciation in the mantle.(peridotite and eclogite used)Geochimica et Cosmochimica Acta, Vol. 275, pp. 99-122.Mantlecarbon

Abstract: Diamonds are unrivalled in their ability to record the mantle carbon cycle and mantle fO2 over a vast portion of Earth’s history. Diamonds’ inertness and antiquity means their carbon isotopic characteristics directly reflect their growth environment within the mantle as far back as ?3.5 Ga. This paper reports the results of a thorough secondary ion mass spectrometry (SIMS) carbon isotope and nitrogen concentration study, carried out on fragments of 144 diamond samples from various locations, from ?3.5 to 1.4 Ga for P [peridotitic]-type diamonds and 3.0 to 1.0 Ga for E [eclogitic]-type diamonds. The majority of the studied samples were from diamonds used to establish formation ages and thus provide a direct connection between the carbon isotope values, nitrogen contents and the formation ages. In total, 908 carbon isotope and nitrogen concentration measurements were obtained. The total ?¹³C data range from ?17.1 to ?1.9 ‰ (P = ?8.4 to ?1.9 ‰; E = ?17.1 to ?2.1‰) and N contents range from 0 to 3073 at. ppm (P = 0 to 3073 at. ppm; E = 1 to 2661 at. ppm). In general, there is no systematic variation with time in the mantle carbon isotope record since > 3 Ga. The mode in ?¹³C of peridotitic diamonds has been at ?5 (±2) ‰ since the earliest diamond growth ?3.5 Ga, and this mode is also observed in the eclogitic diamond record since ?3 Ga. The skewness of eclogitic diamonds’ ?¹³C distributions to more negative values, which the data establishes began around 3 Ga, is also consistent through time, with no global trends apparent. No isotopic and concentration trends were recorded within individual samples, indicating that, firstly, closed system fractionation trends are rare. This implies that diamonds typically grow in systems with high excess of carbon in the fluid (i.e. relative to the mass of the growing diamond). Any minerals included into diamond during the growth process are more likely to be isotopically reset at the time of diamond formation, meaning inclusion ages would be representative of the diamond growth event irrespective of whether they are syngenetic or protogenetic. Secondly, the lack of significant variation seen in the peridotitic diamonds studied is in keeping with modeling of Rayleigh isotopic fractionation in multicomponent systems (RIFMS) during isochemical diamond precipitation in harzburgitic mantle. The RIFMS model not only showed that in water-maximum fluids at constant depths along a geotherm, fractionation can only account for variations of <1‰, but also that the principal ?¹³C mode of ?5 ± 1‰ in the global harzburgitic diamond record occurs if the variation in fO2 is only 0.4 log units. Due to the wide age distribution of P-type diamonds, this leads to the conclusion that the speciation and oxygen fugacity of diamond forming fluids has been relatively consistent. The deep mantle has therefore generated fluids with near constant carbon speciation for 3.5 Ga.
DS202008-1423
2020
Harris, J.W.Meyer, N.A., Stachel, T., Pearson, D.G., Stern, R.A., Harris, J.W.Diamond formation from the lithosphere to the lower mantle revealed by Koffiefontein diamonds.Goldschmidt 2020, 1p. AbstractAfrica, South Africadeposit - Koffiefontein

Abstract: Because of their robust nature, diamonds survive mantle processes and protect occluded minerals since the time of diamond formation. For the Kaapvaal Craton - the archetype for craton formation and evolution - the geochemical signatures of inclusions in Koffiefontein diamonds tell a story from craton formation to evolution and from lithospheric (below about 160 km) to lower mantle (>660 km) environs. We analysed a suite of 94 lithospheric to lower mantle diamonds and their silicate and oxide inclusions. Geochemical results confirm that the diamond substrates are very depleted, with Mg#OL of 91.5-95.0 and a dominance of low-Ca (<1.8 wt% CaO), presumably dunite-derived garnet. The Si-rich nature and preserved high Mg# of the peridotitic diamond substrates beneath Koffiefontein and the formation of KNbO3 (goldschmidtite) from an extremely fractionated melt/fluid indicate that potentially both mantle- and subduction-related fluids are the cause of metasomatism in the Kaapvaal cratonic root. Mantle-like, restricted carbon isotopic compositions of both P- and E-type diamonds (avg. ?13C -5.7 ‰ and -6.6 ‰, respectively) indicate that an abundant, mantle-derived CHO fluid is responsible for diamond formation. Diamonds have a large range in nitrogen concentrations and isotopic compositions, suggesting decoupling from carbon and heterogeneous sources. ?18O of former bridgmanite and ?13C of its host diamond document a purely mantle-derived lower mantle component. Combined, these results reveal a complex and multistage evolution of the Kaapvaal Craton whereby multiple episodes of fluid and melt metasomatism re-enriched the craton already, prior to diamond formation, followed by diamond entrainment in a kimberlite possibly derived from the lower mantle.
DS202009-1613
2020
Harris, J.W.Brenker, F.E., Nestola, F., Brenker, L., Peruzzo, L., Harris, J.W.Origin, properties and structure of breyite: the second most abundant mineral inclusion in super-deep diamonds. The American Mineralogist, in press available, 21p. PdfMantlebreyite
DS202009-1635
2020
Harris, J.W.Koemets, I., Satta, N., Marquardt, H., Kiseeva, E.S., Kurnosov, A., Stachel, T., Harris, J.W., Dubrovinsky, L.Elastic properties of majorite garnet inclusions in diamonds and the seismic signature of pyroxenites in the Earth's upper mantle.American Mineralogist, Vol. 105, pp. 984-991. pdfMantlediamond inclusions

Abstract: Majoritic garnet has been predicted to be a major component of peridotite and eclogite in Earth's deep upper mantle (>250 km) and transition zone. The investigation of mineral inclusions in diamond confirms this prediction, but there is reported evidence of other majorite-bearing lithologies, intermediate between peridotitic and eclogitic, present in the mantle transition zone. If these lithologies are derived from olivine-free pyroxenites, then at mantle transition zone pressures majorite may form monomineralic or almost monomineralic garnetite layers. Since majoritic garnet is presumably the seismically fastest major phase in the lowermost upper mantle, the existence of such majorite layers might produce a detectable seismic signature. However, a test of this hypothesis is hampered by the absence of sound wave velocity measurements of majoritic garnets with relevant chemical compositions, since previous measurements have been mostly limited to synthetic majorite samples with relatively simple compositions. In an attempt to evaluate the seismic signature of a pyroxenitic garnet layer, we measured the sound wave velocities of three natural majoritic garnet inclusions in diamond by Brillouin spectroscopy at ambient conditions. The chosen natural garnets derive from depths between 220 and 470 km and are plausible candidates to have formed at the interface between peridotite and carbonated eclogite. They contain elevated amounts (12-30%) of ferric iron, possibly produced during redox reactions that form diamond from carbonate. Based on our data, we model the velocity and seismic impedance contrasts between a possible pyroxenitic garnet layer and the surrounding peridotitic mantle. For a mineral assemblage that would be stable at a depth of 350 km, the median formation depth of our samples, we found velocities in pyroxenite at ambient conditions to be higher by 1.9(6)% for shear waves and 3.3(5)% for compressional waves compared to peridotite (numbers in parentheses refer to uncertainties in the last given digit), and by 1.3(13)% for shear waves and 2.4(10)% for compressional waves compared to eclogite. As a result of increased density in the pyroxenitic layer, expected seismic impedance contrasts across the interface between the monomineralic majorite layer and the adjacent rocks are about 5-6% at the majorite-eclogite-interface and 10-12% at the majoriteperidotite-boundary. Given a large enough thickness of the garnetite layer, velocity and impedance differences of this magnitude could become seismologically detectable.
DS202010-1872
2020
Harris, J.W.Regier, M.E., Pearson, D.G., Stachel, T., Luth, R.W., Stern, R.A., Harris, J.W.The lithospheric-to-lower-mantle carbon cycle recorded in superdeep diamonds. ( Kankan)Nature, Vol. 585, pp. 234-238. pdfAfrica, Guineadiamond inclusions

Abstract: The transport of carbon into Earth’s mantle is a critical pathway in Earth’s carbon cycle, affecting both the climate and the redox conditions of the surface and mantle. The largest unconstrained variables in this cycle are the depths to which carbon in sediments and altered oceanic crust can be subducted and the relative contributions of these reservoirs to the sequestration of carbon in the deep mantle1. Mineral inclusions in sublithospheric, or ‘superdeep’, diamonds (derived from depths greater than 250 kilometres) can be used to constrain these variables. Here we present oxygen isotope measurements of mineral inclusions within diamonds from Kankan, Guinea that are derived from depths extending from the lithosphere to the lower mantle (greater than 660 kilometres). These data, combined with the carbon and nitrogen isotope contents of the diamonds, indicate that carbonated igneous oceanic crust, not sediment, is the primary carbon-bearing reservoir in slabs subducted to deep-lithospheric and transition-zone depths (less than 660 kilometres). Within this depth regime, sublithospheric inclusions are distinctly enriched in 18O relative to eclogitic lithospheric inclusions derived from crustal protoliths. The increased 18O content of these sublithospheric inclusions results from their crystallization from melts of carbonate-rich subducted oceanic crust. In contrast, lower-mantle mineral inclusions and their host diamonds (deeper than 660 kilometres) have a narrow range of isotopic values that are typical of mantle that has experienced little or no crustal interaction. Because carbon is hosted in metals, rather than in diamond, in the reduced, volatile-poor lower mantle2, carbon must be mobilized and concentrated to form lower-mantle diamonds. Our data support a model in which the hydration of the uppermost lower mantle by subducted oceanic lithosphere destabilizes carbon-bearing metals to form diamond, without disturbing the ambient-mantle stable-isotope signatures. This transition from carbonate slab melting in the transition zone to slab dehydration in the lower mantle supports a lower-mantle barrier for carbon subduction.
DS202106-0976
2021
Harris, J.W.Weiss, Y., Kiro, Y., Class, C., Winckler, G., Harris, J.W., Goldstein, S.L.Helium in diamonds unravels over a billion years of craton metasomatism. KaapvaalNature Communications, Vol. 12, 2667, 11p. PdfAfrica, South Africageochronology

Abstract: Chemical events involving deep carbon- and water-rich fluids impact the continental lithosphere over its history. Diamonds are a by-product of such episodic fluid infiltrations, and entrapment of these fluids as microinclusions in lithospheric diamonds provide unique opportunities to investigate their nature. However, until now, direct constraints on the timing of such events have not been available. Here we report three alteration events in the southwest Kaapvaal lithosphere using U-Th-He geochronology of fluid-bearing diamonds, and constrain the upper limit of He diffusivity (to D???1.8?×?10?19 cm2 s?1), thus providing a means to directly place both upper and lower age limits on these alteration episodes. The youngest, during the Cretaceous, involved highly saline fluids, indicating a relationship with late-Mesozoic kimberlite eruptions. Remnants of two preceding events, by a Paleozoic silicic fluid and a Proterozoic carbonatitic fluid, are also encapsulated in Kaapvaal diamonds and are likely coeval with major surface tectonic events (e.g. the Damara and Namaqua-Natal orogenies).
DS202201-0017
2021
Harris, J.W.Harris, J.W.Diamond. IN: Encyclopedia of Geology 2nd edition Alderton, D., Elias, S.A. eds. Elsevier Publisher , isbn978-0-12-409548-9. 12083-4 pp. 455-472.GlobalBook - notice

Abstract: Encyclopedia of Geology, Second Edition presents in six volumes state-of-the-art reviews on the various aspects of geologic research, all of which have moved on considerably since the writing of the first edition. New areas of discussion include extinctions, origins of life, plate tectonics and its influence on faunal provinces, new types of mineral and hydrocarbon deposits, new methods of dating rocks, and geological processes. Users will find this to be a fundamental resource for teachers and students of geology, as well as researchers and non-geology professionals seeking up-to-date reviews of geologic research.
DS202204-0527
2022
Harris, J.W.Lai, M.Y., Stachel, T., Stern, R.A., Hardman, M.F., Pearson, D.G., Harris, J.W.Formation of mixed paragenesis diamonds during multistage growth - constraints from- in situ Delta 13C-delta 15N-[N] analyses of Koidu diamonds.Geochimica et Cosmochimica Acta, Vol. 323, pp. 20-39.Africa, Sierra Leonedeposit - Koidu

Abstract: Inclusion-bearing diamonds from the Koidu kimberlite complex, Sierra Leone (West African Craton) were analyzed in situ for carbon and nitrogen isotope compositions, nitrogen concentrations and nitrogen aggregation states. In a suite of 105 diamonds, 78% contain eclogitic mineral inclusions, 17% contain peridotitic mineral inclusions, and 5% - an unusually high proportion - contain co-occurring eclogitic and peridotitic mineral inclusions indicating a mixed paragenesis. Major and trace element compositions of mineral inclusions from two mixed paragenesis diamonds (one with omphacite + Mg-chromite, the other with eclogitic garnet + forsteritic olivine) were determined. The presence of positive Eu anomalies in centrally located omphacite and eclogitic garnet inclusions indicates derivation from subducted protoliths, formed as igneous cumulates in lower oceanic crust. Mg-chromite (Cr# 85.5; Mg# 65.2) and olivine (Mg# 94.5) inclusions, located in outer portions of the mixed paragenesis diamonds, have compositions indicative of derivation from strongly depleted cratonic peridotites. Given that the olivine Mg# of 94.5 is the highest reported to date for the West African Craton, the eclogitic and peridotitic inclusions in these mixed paragenesis diamonds cannot have precipitated during infiltration of peridotitic substrates by eclogite-derived fluids, as the consequent fluid-rock interaction should lead to Mg# lower than that for the original peridotitic diamond substrate. The different origins of eclogitic and peridotitic inclusions could be explained by physical transport of their host diamonds from eclogitic into peridotitic substrates, possibly along high-strain shear zones, before renewed diamond growth. Based on the ?¹³C-?¹?N systematics of the entire inclusion-bearing diamond suite from Koidu, three major compositional clusters are identified. Cluster 1 (eclogitic diamond cores; ?¹³C = -33.2 to -14.4 ‰ and ?¹?N = -5.3 to +10.1 ‰) bears the isotopic signature of recycled crustal material (± a mantle component). Cluster 2 (peridotitic diamonds and including the core of a diamond containing omphacite + Mg-chromite; ?¹³C = -6.0 to -1.1 ‰ and ?¹?N = -4.2 to +9.7 ‰) likely involves mixing of carbon and nitrogen from subducted and mantle sources. Cluster 3 (rims of eclogitic diamonds and including the eclogitic garnet + olivine included diamond and the rim of the omphacite + Mg-chromite included diamond; ?¹³C = -7.8 to -3.6 ‰ and ?¹?N = -7.9 to -2.1 ‰) matches convecting mantle-derived fluids/melts. The distinct isotopic signatures of the three diamond clusters, together with differences in nitrogen aggregation and cathodoluminescence response between diamond cores and rims, suggest episodic diamond growth during multiple fluid/melt pulses.
DS200712-1082
2007
Harris, K.L.Thorleifson, L.H., Harris, K.L., Hobbs, H.C., Jennings, C., Knaeble, Lively, Lusar, MeyerTill geochemical and indicator mineral reconnaissance of Minesota.Minnesota Geological Survey, Open File, 07-01, 512p. ( 7p.summary on line)United States, MinnesotaGeochemistry
DS1992-0674
1992
Harris, L.Harris, L.Mining and the well informed citizenMining Engineering, Vol. 44, No. 8, August pp. 999-1002GlobalEconomics, Education -public
DS2002-0655
2002
Harris, L.B.Harris, L.B., Koyi, H.A.Centrifuge modelling of folding in high grade rocks during riftingJournal of Structural Geology, Vol. 25, 2, pp. 291-305.MantleLithosphere - basal ductile layer
DS2002-0656
2002
Harris, L.B.Harris, L.B., Koyi, H.A., Fossen, H.Mechanisms for folding of high grade rocks in extensional tectonic settingsEarth Science Reviews, Vol. 59, 1-4, Nov. pp. 163-210.GlobalUHP, Tectonics
DS2003-0303
2003
Harris, L.B.Crowe, W.A., Nash, C.R., Harris, L.B., Leeming, P.M., Rankin, L.R.The geology of the Rengali province: implications for the tectonic development ofJournal of Asian Earth Sciences, Vol. 21, 7, pp. 697-710.IndiaTectonics - not specific to diamonds
DS200412-0390
2003
Harris, L.B.Crowe, W.A., Nash, C.R., Harris, L.B., Leeming, P.M., Rankin, L.R.The geology of the Rengali province: implications for the tectonic development of northern Orissa, India.Journal of Asian Earth Sciences, Vol. 21, 7, pp. 697-710.IndiaTectonics - not specific to diamonds
DS201412-0046
2014
Harris, L.B.Bedard, J.H., Harris, L.B.Neoarchean disaggregation and reassembly of the Superior Craton.Geology, Vol. 42, 11, pp. 951-954.Canada, Ontario, QuebecCraton, geodynamics
DS200412-0799
2004
Harris, M.Harris, M., Le Roex, A., Class, C.Geochemistry of the Uintjiesberg kimberlite, South Africa: petrogenesis of an off-craton, group I, kimberlite.Lithos, Vol. 74, pp. 149-165.Africa, South AfricaGeochemistry - Namaqua-Natal Proterozoic belt
DS201812-2883
2018
Harris, M.Sims, K., Fox, K., Harris, M., Chimuka, L., Reichhardt, F., Muchemwa, E., Gowera, R., Hinks, D., Smith, C.B.Murowa deposit: Discovery of the Murowa kimberlites, Zimbabwe.Society of Economic Geology Geoscience and Exploration of the Argyle, Bunder, Diavik, and Murowa Diamond Deposits, Special Publication no. 20, pp. 359-378.Africa, Zimbabwedeposit - Murowa
DS1996-1335
1996
Harris, M.J.Smith, T.E., Harris, M.J.The Queensborough mafic-ultramafic complex: a fragment of Mesoproterozoicophiolite? Grenville ProvinceTectonophysics, Vol. 265, No. 1/2, Nov. 15, pp. 53-82OntarioOphiolite, Grenville Orogeny
DS2001-0452
2001
Harris, M.J.Harris, M.J., Symons, D.T.A., Peck, Blackburn, TurekDevelopments in the 2.1 to 1.7 Ga apparent polar wander path for the Trans-Hudson Orogen and Superior Craton.Geological Association of Canada (GAC) Annual Meeting Abstracts, Vol. 26, p.59, abstract.Manitoba, SaskatchewanTrans Hudson Orogen, Tectonics
DS200512-1067
2005
Harris, M.J.Symons, D.T.A., Harris, M.J.Accretion history of the Trans Hudson orogen in Manitoba and Saskatchewan from paleomagnetism.Canadian Journal of Earth Sciences, Vol. 42, 4, April pp. 1-18.Canada, Saskatchewan, ManitobaGeophysics - Lithoprobe
DS2001-1240
2001
Harris, N.Williams, H., Turner, S., Kelley, S., Harris, N.Age and composition of dikes in Southern Tibet: new constraints on the timing of east west extension ...Geology, Vol. 29, No. 4, Apr. pp.339-42.Tibetvolcanism - post collisional, Geodynamics
DS1983-0284
1983
Harris, N.B.W.Harris, N.B.W., et al.Geochemistry and Petrogenesis of a Nepheline Syenite-carbonatite Complex.Geological Magazine., Vol. 120, No. 2, PP. 115-127.GlobalCarbonatite
DS1984-0244
1984
Harris, N.B.W.Drury, S.A., Harris, N.B.W., Holt, R.W., Reeves-Smith, G.J.Precambrian Tectonics and Crustal Evolution in South IndiaJournal of GEOLOGY, Vol. 92, PP. 3-20.IndiaGeotectonics
DS1989-0982
1989
Harris, N.B.W.McDermott, F., Harris, N.B.W., Hawkesworth, C.J.Crustal reworking in southern Africa: constraints from Sr-neodymium isotope studies in Archean to Pan-AfricanterrainsTectonophysics, Vol. 161, No. 3/4, pp. 257-270South AfricaGeochronology, Tectonics
DS1991-0378
1991
Harris, N.B.W.Dewey, J.F., Gass, O.G., Curry, G.B., Harris, N.B.W., Sengor, A.M.C.Allochthonous terranesCambridge University Press, 150p. approx. $ 50.00GlobalTerranes, Book -ad
DS1994-0722
1994
Harris, N.B.W.Harris, N.B.W., Santosh, M., Taylor, P.N.Crustal evolution in South India: constraints from neodymium isotopesJournal of Geology, Vol. 102, pp. 139-50.India, South IndiaTectonics, Karnataka Craton
DS1996-0606
1996
Harris, N.B.W.Harris, N.B.W., Bartlett, J.M., Santosh, M.Neodymium isotope constraints on the tectonic evolution of East GondwanaJournal of Southeast Asian Sciences, Vol. 14, No. 3-4, pp. 119-125India, Sri Lanka, Madagascar, East Africa, GondwanaGeochronology, Tectonics
DS201112-0475
2011
Harris, N.B.W.Jamieson, R.A., Unsworth, M.J., Harris, N.B.W., Rosenberg, C.L., Schulmann, K.Crustal melting and the flow of mountains.Elements, Vol. 7, 4, August pp. 253-260.Mantle, AsiaCrustal deformation - weakening
DS1998-0588
1998
Harris, P.D.Harris, P.D., Courtnage, P.M.The effects of regolith landform development in diamond exploration: a spectral investigation.7th International Kimberlite Conference Abstract, pp. 305-7.GlobalWeathering, profile, geomorpholoyg, Mineralogy
DS1960-1124
1969
Harris, P.G.Harris, P.G.Basalt Type and African Rift Valley TectonismTectonophysics, Vol. 8, No. 4-6, PP. 427-436.South AfricaTectonics
DS1960-1125
1969
Harris, P.G.Harris, P.G., Middlemost, E.A.K.The Evolution of KimberlitesLithos, Vol. 3, PP. 77-88.South Africa, GlobalKimberlite, Genesis, Shields, Geochemistry, Upper Mantle
DS1970-0524
1972
Harris, P.G.Harris, P.G., Hutchison, R.W., Paul, D.K.Plutonic Xenoliths and their Relation to the Upper MantlePhil. Royal Society. (London) Transactions, Vol. A271, No. 213, PP. 313-323.GlobalGenesis
DS1975-0157
1975
Harris, P.G.Paul, D.K., Potts, P.J., Gibson, I.L., Harris, P.G.Rare Earth Abundances in Indian KimberlitesEarth and Planetary Science Letters, Vol. 25, PP. 151-158.IndiaRare Earth Elements (ree), Geochemistry
DS1975-0158
1975
Harris, P.G.Paul, D.K., Rex, D.C., Harris, P.G.Chemical Characteristics and Potassium-argon Ages of Indian KimberliteGeological Society of America (GSA) Bulletin., Vol. 86, No. 3, PP. 364-366.IndiaGeochronology, Geochemistry, Kimberlites
DS1975-0598
1977
Harris, P.G.Paul, D.K., Gale, N.H., Harris, P.G.Uranium and Thorium Abundances in Indian KimberlitesGeochimica Et Cosmochimica Acta, Vol. 41, No. 2, PP. 335-339.IndiaIsotope
DS1984-0343
1984
Harris, P.G.Harris, P.G.Kimberlite Volcanism #2University of Western Australia - Special Publication, No. 8, PP. 125-142.GlobalLamprophyre, Analogies, Pyroclastic Surges, Maars, Tuffs, Phreato
DS1984-0344
1984
Harris, P.G.Harris, P.G.Kimberlite Volcanism #1Kimberlite Occurrence And Origin A Basis For Conceptual Mode, PP. 13-14. (abstract.).GlobalMaars, Origin, Processes, Eruptive, Ascent, Diatreme, Lamproite
DS2000-0391
2000
Harris, P.J.F.Harris, P.J.F., Vis, R.D., Heymann, D.Fullerene like carbon nanostructures in the Allende meteoriteEarth and Planetary Science Letters, Vol.183, No.3-4, pp.355-59.GlobalMeteorite, Fullerene
DS1985-0270
1985
Harris, R.E.Harris, R.E., Hausel, W.D., Meyer, J.E.Metallic and Industrial Minerals Map of WyomingGeological Survey WYOMING, 1:500, 000 IN COLOUR.United States, State Line, WyomingDiamond Occurrences
DS1994-0742
1994
Harris, R.E.Hausel, W.D., Harris, R.E., Moore, T.A.Diamond exploration and history of WyomingMining Engineering, Vol. 46, No. 5, May pp. 421, 422.WyomingNews item, Redaurum
DS1992-0675
1992
Harris, S.Harris, S.Provisions on subsidies and countervailing measures in the Draft Multilateral Trade Negotiations TextWorld Mineral Notes, Vol. 8, No. 4, September pp. 1-3CanadaEconomics, NAFTA.
DS1998-0589
1998
Harris, S.A.Harris, S.A.Nonsorted circles on Plateau Mountain, Southwest AlbertaCollection Nordicana, No. 57, pp. 441-8.AlbertaGeomorphology - permafrost
DS2002-0657
2002
Harris, S.A.Harris, S.A.Global heat budget, plate tectonics and climatic changeGeografiska Annaler Series A., Vol. 84,1,pp.1-10., Vol. 84,1,pp.1-10.MantleTectonics
DS2002-0658
2002
Harris, S.A.Harris, S.A.Global heat budget, plate tectonics and climatic changeGeografiska Annaler Series A., Vol. 84,1,pp.1-10., Vol. 84,1,pp.1-10.MantleTectonics
DS1990-0664
1990
Harris, S.L.Harris, S.L.Agents of chaosMountain Press, 300p. $ 12.95GlobalBook review, Agents of Chaos-earthquakes
DS1997-0296
1997
Harris, T.R.Dunnigan, G.M., Hammen, J.L., Harris, T.R.A SAS-IML program for implementing two phase regression analysis of geophysical time series dataComputers and Geosciences, Vol. 23, No. 7, pp. 763-770GlobalComputers, Program - SAS-IML
DS1990-0665
1990
Harris, W.M.Jr.Harris, W.M.Jr., Enochs, L.G., West, R.R.MapKansas a graphical geological database for KansasGeological Society of America (GSA) Abstracts with programs, South-Central, Vol. 22, No. 1, p. 8KansasMap, Teaching aid
DS200712-0055
2007
HarrisonBarry, T.L., Ivanov, A.V., Rasskazov, S.V., Demonterova, E.I., Dunai, T.J., Davies, G.R., HarrisonHelium isotopes provide no evidence for deep mantle involvement in Wide spread Cenozoic volcanism across central Asia.Lithos, Vol. 95, 3-4, pp. 415-424.AsiaGeochronology
DS202111-1782
2021
Harrison, A.L.Sader, J.A., Harrison, A.L., McClenaghan, M.B., Hamilton, S.M., Clark, I.D.Sherwood Lollar, B., Leybourne, M.I.Generation of high-pH groundwaters and H2 gas by groundwater-kimberlite interaction, northeastern Ontario.The Canadian Mineralogist, Vol. 59, pp. 1261-1276. doi:10.3749/canmin.2000048 pdfCanada, Ontariodeposit - Kirkland Lake

Abstract: We report new isotopic data for H2 and CH4 gases and Sr for groundwater collected from Jurassic Kirkland Lake kimberlites in northern Ontario, Canada. Groundwaters interacting with kimberlites have elevated pH (up to 12.4), are reducing (Eh as low as the H2-H2O couple), are dominated by OH? alkalinity, and have non-radiogenic (mantle) 87Sr/86Sr values (?0.706-0.707). Most significantly, the highest pH groundwaters have low Mg, high K/Mg, and are associated with abundant reduced gases (H2 ± CH4). Open system conditions favor higher dissolved inorganic carbon and CH4 production, whereas under closed system conditions low DIC, elevated OH? alkalinity, and H2 production are enhanced. Hydrogen gas is isotopically depleted (?2HH2 = ?771 to ?801‰), which, combined with ?2HH2O, yields geothermometry temperatures of serpentinization of 5-25 °C. Deviation of H2-rich groundwaters (by up to 10‰) from the meteoric water line is consistent with Rayleigh fractionation during reduction of water to H2. Methane is characterized by ?13CCH4 = ?35.8 to ?68‰ and ?2HCH4 = ?434‰. The origin of CH4 is inconclusive and there is evidence to support both biogenic and abiogenic origins. The modeled groundwater-kimberlite reactions and production of elevated concentrations of H2 gas suggest uses for diamond-production tailings, as a source of H2 for fuel cells and as a carbon sink.
DS1950-0103
1952
Harrison, A.R.Harrison, A.R.The Occurrence, Mining and Recovery of DiamondsJournal of Chemical, Metallurgical and Mineralogical Society STH. AFR., Vol. 52, No. 10, PP. 315-325. ALSO Mining EngineeringSouth Africa, Southwest Africa, NamibiaSampling, Recovery
DS1950-0393
1958
Harrison, A.R.Harrison, A.R.Diamond Mining in AfricaSheffield University Mining Magazine., PP. 87-94.South AfricaMining Methods, Production
DS1998-0999
1998
Harrison, C.Meyers, J.B., Rosendahl, B.R., Harrison, C., Dong-DingDeep imaging seismic and gravity results from the offshore Cameroon Volcanic Line and African hotlines.Tectonophysics, Vol. 284, No. 1-2, Jan. 15, pp. 31-63.West Africa, Sierra LeoneGeophysics - seismics, Mantle convection, Craton
DS1994-0723
1994
Harrison, C.G.A.Harrison, C.G.A.Rates of continental erosion and mountain buildingGeologische Rundschau, Vol. 83, No. 2, July pp. 431-447GlobalErosion, Mountain building
DS1999-0291
1999
Harrison, D.Harrison, D., Burnard, P., Turner, G.Noble gas behaviour and composition in the mantle: constraints from Icelandplume.Earth and Planetary Science Letters, Vol. 171, No. 2, Aug. 30, pp. 199-208.GlobalGeochemistry, Plume
DS1999-0292
1999
Harrison, D.Harrison, D., Burnard, P., Turner, G.Noble gas behaviour and composition in the mantle: constraints from the Iceland plume.Earth and Planetary Science Letters, Vol. 171, pp. 199-207.GlobalModels, plumes, mantle
DS2003-0186
2003
Harrison, D.Burgess, R., Harrison, D., Hobson, E., Harris, J.W.Noble gas and halogen constraints on the origin of volatile rich fluids in Canadian8ikc, Www.venuewest.com/8ikc/program.htm, Session 3, POSTER abstractNorthwest TerritoriesDiamonds - mineralogy, Deposit - Panda
DS200412-0800
2004
Harrison, D.Harrison, D., barry, T.,Turner, G.Possible diffusive fractionation of helium isotopes in olivine and clinopyroxene phenocrysts.European Journal of Mineralogy., Vol.16, 2, March, pp. 213-220.TechnologyMineralogy
DS200612-0539
2005
Harrison, D.Harrison, D., Ballentine, C.J.Noble gas models of mantle structure and reservoir mass transfer.American Geophysical Union, Geophysical Monograph, Ed. Van der Hilst, Earth's Deep Mantle, structure ...., No. 160, pp. 9-26..MantleGeochemistry
DS200812-1159
2008
Harrison, D.Teague, A.J., Seward, T.M., Harrison, D.Mantle source for Oldoinyo Lengai carbonatites: evidence from helium isotopes in fumarole gases.Journal of Volcanology and Geothermal Research, Vol. 175, 3. August 10, pp. 386-390.Africa, TanzaniaCarbonatite
DS200812-1160
2008
Harrison, D.Teague, A.J., Seward, T.M., Harrison, D.Mantle source for Oldoinyo Lengai carbonatites: evidence from helium isotopes in fumarole gases.Journal of Volcanology and Geothermal Research, Vol. 175, 3, pp. 386-390.Africa, TanzaniaCarbonatite
DS200912-0087
2009
Harrison, D.Burgess, R., Cartigny, P., Harrison, D., Hobson, E., Harris, J.Volatile composition of Micro inclusions in diamonds from the PAnd a kimberlite, Canada: implications for chemical and isotopic heterogeneity in the mantle.Geochimica et Cosmochimica Acta, Vol. 73, 6, pp. 1779-1794.Canada, Northwest TerritoriesDeposit - Panda
DS1989-1606
1989
Harrison, J.West, M., Harrison, J.Bayesian forecasting and dynamic modelsSpringer Verlag Texts in Statistics, 704p. approx. $ 56.00GlobalGeostatistics, Book -Statistics
DS1996-0607
1996
Harrison, J.C.Harrison, J.C., De Frietas, T.New showings and new geological settings for mineral exploration in the Arctic Islands.Geological Survey of Canada (GSC) Paper, No. 1996-B, pp. 81-91.Northwest Territories, Arctic IslandsGeology
DS1999-0014
1999
Harrison, J.C.Anglin, C.D., Harrison, J.C.Mineral resources, deposit models and assessmentGeological Survey of Canada (GSC) Open File, No. 3714, pp. E1-17. $ 50.00 (242p)Northwest Territories, NunavutExploration
DS201706-1077
2017
Harrison, J.C.Harrison, J.C., St. Onge, M.R., Paul, D., Brodaric, B.A new geological map and map database for Canada north of 60.GAC annual meeting, 1p. AbstractCanadamap
DS201706-1105
2017
Harrison, J.C.St. Onge, M.R., Harrison, J.C., Paul, D., Tella, S., Brent, T.A., Jauer, C.D., MacleanTectonic map of Arctic Canada (TeMAC): a first derivative product from Canada in 3-D geological compilation work.GAC annual meeting, 1p. AbstractCanadatectonics
DS1993-0633
1993
Harrison, J.E.Harrison, J.E., Cressman, E.R.Geology of the Libby thrust belt of north western Montana and its implications to regional tectonicsUnited States Geological Survey (USGS) Prof. Paper, No. P 1524, 42p. $ 3.50MontanaTectonics, Libby thrust belt
DS200712-0679
2006
Harrison, J.P.Manson, N.B., Harrison, J.P., Sellars, M.J.Nitrogen vacancy center in diamond: model of the electronic structure and associated dynamics.Physical Review Letters, Vol. 74, 10, 104303 ingenta 1064798716TechnologyDiamond mineralogy
DS1960-1126
1969
Harrison, N.M.Harrison, N.M.The Geology of the Country Around Fort Rixon and ShanganiGeological Survey Southern Rhodesia Bulletin., No. 61, 152P.ZimbabweGeology, Related Rocks
DS1975-0649
1977
Harrison, N.M.Watkeys, M.K., Harrison, N.M.Kimberlites in RhodesiaRhodesia Geological Survey Annual Report, Vol. 3, PP. 71-74.ZimbabweGeology
DS1975-0872
1978
Harrison, N.M.Stagman, J.G., Harrison, N.M., Broderick, T.J., Stocklmayer, V.An Outline of the Geology of RhodesiaRhodesia Geological Survey, Bulletin. No. 80, 126P.ZimbabweGeology, Kimberley
DS1975-1055
1979
Harrison, P.Harrison, P.The structure and sedimentology of the Sinclair Group in theAwasibMountains, diamond area no. 2, S.W.A.Bsc. Hons. Rhodes University, Grahamstown, South Africa, Southwest Africa, NamibiaBlank
DS2001-0755
2001
Harrison, R.J.McEnroe, S.A., Harrison, R.J., Robinson, P., GollaEffect of fine scale microstructures in titanohematite on the acquisition and stability of natural remnant...Journal of Geophysical Research, Vol. 106, No. 12, pp. 30,523-46.SwedenCrustal magnetism
DS202001-0044
2019
Harrison, R.J.Tang, F., Taylor, R.J.M., Einsle, J.F., Borlina, C.S., Fu, R.R., Weiss, B.P., Williams, H.M., Williams, W., Nagy, L., Midgley, P.A., Lima, E.A., Bell, E.A., Harrison, T.M., Alexander, E.W., Harrison, R.J.Secondary magnetite in ancient zircon precludes analysis of a Hadean geodynamo. Jack HillsProceedings National Academy of Science, Vol. 116, pp. 407-412.Australiapaleomagnetism

Abstract: Zircon crystals from the Jack Hills, Western Australia, are one of the few surviving mineralogical records of Earth’s first 500 million years and have been proposed to contain a paleomagnetic record of the Hadean geodynamo. A prerequisite for the preservation of Hadean magnetization is the presence of primary magnetic inclusions within pristine igneous zircon. To date no images of the magnetic recorders within ancient zircon have been presented. Here we use high-resolution transmission electron microscopy to demonstrate that all observed inclusions are secondary features formed via two distinct mechanisms. Magnetite is produced via a pipe-diffusion mechanism whereby iron diffuses into radiation-damaged zircon along the cores of dislocations and is precipitated inside nanopores and also during low-temperature recrystallization of radiation-damaged zircon in the presence of an aqueous fluid. Although these magnetites can be recognized as secondary using transmission electron microscopy, they otherwise occur in regions that are indistinguishable from pristine igneous zircon and carry remanent magnetization that postdates the crystallization age by at least several hundred million years. Without microscopic evidence ruling out secondary magnetite, the paleomagnetic case for a Hadean-Eoarchean geodynamo cannot yet been made.
DS1994-0724
1994
Harrison, R.W.Harrison, R.W., Schultz, A.Strike slip faulting at Thebes Gap, Missouri and Illinois: implications for New Madrid tectonism.Tectonics, Vol. 13, No. 2, April pp. 246-257.Missouri, IllinoisTectonics, Rifting
DS1999-0293
1999
Harrison, R.W.Harrison, R.W., Hoffman, D., Vaughn, J.D., et al.An example of neotectonism in a continental interior - Thebes Gap, Midcontinent, United States.Tectonophysics, Vol. 305, pp. 399-417.Missouri, Illinois, MidcontinentTectonics, New Madrid Rifting
DS2003-0988
2003
Harrison, S.Mustafa, J., Nowicki, T.E., Oshust, P., Dyck, D., Crawford, B., Harrison, S.The geology of the Misery kimberlite, Ekati diamond mine, Canada8ikc, Www.venuewest.com/8ikc/program.htm, Session 1 POSTER abstractNorthwest TerritoriesKimberlite geology and economics, Deposit - Misery
DS200512-0838
2004
Harrison, S.Penny, S.R., Allen, R.M., Harrison, S., Lees, T.C., Murphy, F.C., Norman, A.R., Roberts, P.A.A global scale exploration risk analysis technique to determine the best mineral belts for exploration.Transactions of Institute of Mining and Metallurgy, Vol. 113, September pp. 183-194.Economics - risk analysis
DS200612-0892
2006
Harrison, S.McElroy, R., Nowicki, T., Dyck, D., Carlson, J., Todd, J., Roebuck, S., Crawford, B., Harrison, S.The geology of the PAnd a kimberlite Ekati mine, Canada.Emplacement Workshop held September, 5p. extended abstractCanada, Northwest TerritoriesDeposit - Panda geology
DS200612-0956
2006
Harrison, S.Mustafa, J., Norwicki, T., Oshust, P., Dyck, D., Crawford, B., Harrison, S.The geology of the Misery kimberlite, Ekati diamond mine, Canada.Emplacement Workshop held September, 5p. abstractCanada, Northwest TerritoriesDeposit - Misery
DS200912-0134
2009
Harrison, S.Crawford, B., Hetman, C., Nowicki, T., Baumgartner, M., Harrison, S.The geology and emplacement history of the Pigeon kimberlite, EKATI diamond mine, Northwest Territories, Canada.Lithos, In press - available 35p.Canada, Northwest TerritoriesDeposit - Pigeon
DS200912-0283
2009
Harrison, S.Harrison, S., Leuangthong, O., Crawford, B., Oshust, P.Uncertainty based grade modeling of kimberlite: a case study of the Jay kimberlite pipe, Ekati diamond mine, Canada.Lithos, In press available, 25p.Canada, Northwest TerritoriesSequential Gaussian Simulation - evaluation
DS201212-0765
2012
Harrison, S.Webb, K.J., Hetman, C.M., Nowicki, T.E., Harrison, S., Carlson, J., Parson, S., Paul, J.L.The updated model of the Misery kimberlite complex, Ekati mine, Northwest Territories.10th. International Kimberlite Conference Held Bangalore India Feb. 6-11, Poster abstractCanada, Northwest TerritoriesDeposit - Misery
DS1993-0046
1993
Harrison, S.H.Aspden, J.A., Harrison, S.H., Rundle, C.C.New geochronological control for tectono-magmatic evolution of the metamorphic basement, Cordillera Real and El Oro Province of EcuadorJournal of South America Earth Sciences, Vol. 6, No. 1, 2 pp. 77-96EcuadorGeochronology, metamorphism
DS1983-0629
1983
Harrison, T.M.Watson, E.B., Harrison, T.M.Zircon saturation revisited: temperature and composition effects in avariety of crustal magma types.Earth and Planetary Science Letters, Vol. 64, pp. 295-304.MantleMagma, Zircon Solubility
DS1992-0626
1992
Harrison, T.M.Grunow, A.M., Dalziel, I.W.D., Harrison, T.M., Heizler, M.T.Structural geology and geochronology of subduction complexes along the margin of Gondwanaland: new dat a from the Antarctic Peninsula and southernmostAndesGeological Society of America (GSA) Bulletin, Vol. 104, No. 11, November pp. 1497-1514Andes, AntarcticaStructure, Geochronology
DS1996-1579
1996
Harrison, T.M.Yin, A., Harrison, T.M.The tectonic evolution of AsiaCambridge University of Press, 650p. approx. $ 260.00 United StatesGlobalBook - table of contents, Tectonic evolution
DS200512-1170
2005
Harrison, T.M.Watson, E.B., Harrison, T.M.Zircon thermometer reveals minimum melting conditions on earliest Earth.Science, Vol. 308, 5723, May 6, p. 308-MantleGeothermometry
DS200612-0540
2005
Harrison, T.M.Harrison, T.M., Blichert-Toft, J., Muller, W., Albarede, F., Holden, P., Mojzsis, S.J.Heterogeneous Hadean hafnium: evidence of continental crust 4.4 to 4.5 Ga.Science, Vol. 310, 5736 Dec. 23, pp. 1947-1949.MantleGeochronology
DS200612-0541
2006
Harrison, T.M.Harrison, T.M., McCulloch, M.T., Blichert-Toft, J., Albarede, F., Holden, P., Mojzsis, S.J.Further Hf isotope evidence for Hadean continental crust.Geochimica et Cosmochimica Acta, Vol. 70, 18, 1, p. 14, abstract only.MantleGeochronology
DS200712-0083
2007
Harrison, T.M.Blichert-Toft, J., Harrison, T.M., Albarede, F.The age of the earliest continental crust and onset of plate tectonics.Plates, Plumes, and Paradigms, 1p. abstract p. A98.AustraliaGeochronology
DS200712-0415
2007
Harrison, T.M.Harrison, T.M., Schmitt, A.K.High sensitivity mapping of Ti distributions in Hadean zircons.Earth and Planetary Science Letters, Vol. 261, 1-2, pp. 9-19.Technologygeochronology
DS200812-0182
2008
Harrison, T.M.Caro, G., Bennett, V.C., Bourdon, B., Harrison, T.M., Von Quadt, A., Mojzsis, S.J., Harris, J.W.Application of precise 142 Nd 144 Nd analysis of small samples to inclusions in diamonds ( Finsch SA ) and Hadean zircons ( Jack Hills, Western Australia).Chemical Geology, Vol. 247, 1-2, pp. 253-265.Africa, South Africa, AustraliaGeochronology
DS200812-0202
2008
Harrison, T.M.Chamberlain, K.R., Harrison, T.M., Schmitt, A.K., Heaman, L.M., Swapp, S.M., Khudoley, A.K.In situ SIMS microbaddeleyite U Pb dating method for mafic rocks.Goldschmidt Conference 2008, Abstract p.A147.TechnologyGeochronology
DS200812-0448
2008
Harrison, T.M.Harrison, T.M., Schmitt, A.K., McCulloch, M.T., Lovera, O.M.Evidence of crust during the first 100 m.y. of Earth's history: Lu-Hf, delta18 O, and Ti thermometry results for Hadean zircons.Goldschmidt Conference 2008, Abstract p.A355.MantleGeochronology
DS201112-0448
2010
Harrison, T.M.Hopkins, M.D., Harrison, T.M., Manning, C.E.Constraints on Hadean geodynamics from mineral inclusions in > 4 Ga zircons.Earth and Planetary Science Letters, Vol. 298, 3-4, pp. 367-376.MantleGeochronology
DS201212-0777
2012
Harrison, T.M.Wiellicki, M.M., Harrison, T.M., Schmitt, A.K.Geochemical signatures and magmatic stability of terrestrial impact produced zircons.Earth and Planetary Science Letters, Vol. 321-322, pp. 20-31.MantleImpact structures
DS201312-0397
2014
Harrison, T.M.Carlson, R.W., Garnero, E., Harrison, T.M., Li, J., Manga, M., McDonough, W.F., Mukhopadhyay, S., Romanowicz, B., Rubie, D., Williams, Q., Zhong, S.Deep time: how did the early Earth become our modern world?Annual Review of Earth and Planetary Sciences, Vol. 42, pp. 151-178.MantleConvection, composition
DS201412-0100
2014
Harrison, T.M.Carlson, R.W., Garnero, E., Harrison, T.M., Li, J., Manga, M., McDonough, W.F., Mukhopadhyay, S., Romanowicz, B., Rubie, D., Williams, Q., Zhong, S.How did early Earth become our modern world?Annual Review of Earth and Planetary Sciences, Vol. 42, pp. 151-178.MantleMelting
DS201412-0517
2014
Harrison, T.M.Liu, D., Zhao, Z., Zhu, D-C., DePaolo, D.J., Harrison, T.M., Mo, X., Dong, G., Zhou, S., Sun, C., Zhang, Z., Liu, J.Post collisional potassic and ultrapotassic rocks in southern Tibet: mantle and crustal origins in response to India-Asia collision and convergence.Geochimica et Cosmochimica Acta, Vol. 143, pp. 207-231.Asia, TibetAlkalic
DS201412-0518
2014
Harrison, T.M.Liu, D., Zhao, Z., Zhu, D-C., Niu, Y., Harrison, T.M.Zircon xenocrysts in Tibetan ultrapotassic magmas: imaging the deep crust through time.Geology, Vol. 42, pp. 43-46.Asia, TibetGeochronology
DS201608-1390
2016
Harrison, T.M.Bell, E.A., Boehnke, P., Harrison, T.M.Recovering the primary geochemistry of Jack Hills zircons through quantitative estimates of chemical alteration.Geochimica et Cosmochimica Acta, Vol. 191, pp. 187-202.AustraliaJack Hills REE

Abstract: Despite the robust nature of zircon in most crustal and surface environments, chemical alteration, especially associated with radiation damaged regions, can affect its geochemistry. This consideration is especially important when drawing inferences from the detrital record where the original rock context is missing. Typically, alteration is qualitatively diagnosed through inspection of zircon REE patterns and the style of zoning shown by cathodoluminescence imaging, since fluid-mediated alteration often causes a flat, high LREE pattern. Due to the much lower abundance of LREE in zircon relative both to other crustal materials and to the other REE, disturbance to the LREE pattern is the most likely first sign of disruption to zircon trace element contents. Using a database of 378 (148 new) trace element and 801 (201 new) oxygen isotope measurements on zircons from Jack Hills, Western Australia, we propose a quantitative framework for assessing chemical contamination and exchange with fluids in this population. The Light Rare Earth Element Index is scaled on the relative abundance of light to middle REE, or LREE-I = (Dy/Nd) + (Dy/Sm). LREE-I values vary systematically with other known contaminants (e.g., Fe, P) more faithfully than other suggested proxies for zircon alteration (Sm/La, various absolute concentrations of LREEs) and can be used to distinguish primary compositions when textural evidence for alteration is ambiguous. We find that zircon oxygen isotopes do not vary systematically with placement on or off cracks or with degree of LREE-related chemical alteration, suggesting an essentially primary signature. By omitting zircons affected by LREE-related alteration or contamination by mineral inclusions, we present the best estimate for the primary igneous geochemistry of the Jack Hills zircons. This approach increases the available dataset by allowing for discrimination of on-crack analyses (and analyses with ambiguous or no information on spot placement or zircon internal structures) that do not show evidence for chemical alteration. It distinguishes between altered and unaltered samples in ambiguous cases (e.g., relatively high Ti), identifying small groups with potentially differing provenance from the main Jack Hills population. Finally, filtering of the population using the LREE-I helps to more certainly define primary correlations among trace element variables, potentially relatable to magmatic compositional evolution.
DS201611-2099
2016
Harrison, T.M.Bell, E.A., Boehnke, P., Harrison, T.M.Recovering the primary geochemistry of Jack Hills zircons through quantitative estimates of chemical alteration.Geochimica et Cosmochimica Acta, Vol. 191, pp. 187-202.AustraliaGeochemistry

Abstract: Despite the robust nature of zircon in most crustal and surface environments, chemical alteration, especially associated with radiation damaged regions, can affect its geochemistry. This consideration is especially important when drawing inferences from the detrital record where the original rock context is missing. Typically, alteration is qualitatively diagnosed through inspection of zircon REE patterns and the style of zoning shown by cathodoluminescence imaging, since fluid-mediated alteration often causes a flat, high LREE pattern. Due to the much lower abundance of LREE in zircon relative both to other crustal materials and to the other REE, disturbance to the LREE pattern is the most likely first sign of disruption to zircon trace element contents. Using a database of 378 (148 new) trace element and 801 (201 new) oxygen isotope measurements on zircons from Jack Hills, Western Australia, we propose a quantitative framework for assessing chemical contamination and exchange with fluids in this population. The Light Rare Earth Element Index is scaled on the relative abundance of light to middle REE, or LREE-I = (Dy/Nd) + (Dy/Sm). LREE-I values vary systematically with other known contaminants (e.g., Fe, P) more faithfully than other suggested proxies for zircon alteration (Sm/La, various absolute concentrations of LREEs) and can be used to distinguish primary compositions when textural evidence for alteration is ambiguous. We find that zircon oxygen isotopes do not vary systematically with placement on or off cracks or with degree of LREE-related chemical alteration, suggesting an essentially primary signature. By omitting zircons affected by LREE-related alteration or contamination by mineral inclusions, we present the best estimate for the primary igneous geochemistry of the Jack Hills zircons. This approach increases the available dataset by allowing for discrimination of on-crack analyses (and analyses with ambiguous or no information on spot placement or zircon internal structures) that do not show evidence for chemical alteration. It distinguishes between altered and unaltered samples in ambiguous cases (e.g., relatively high Ti), identifying small groups with potentially differing provenance from the main Jack Hills population. Finally, filtering of the population using the LREE-I helps to more certainly define primary correlations among trace element variables, potentially relatable to magmatic compositional evolution.
DS202001-0044
2019
Harrison, T.M.Tang, F., Taylor, R.J.M., Einsle, J.F., Borlina, C.S., Fu, R.R., Weiss, B.P., Williams, H.M., Williams, W., Nagy, L., Midgley, P.A., Lima, E.A., Bell, E.A., Harrison, T.M., Alexander, E.W., Harrison, R.J.Secondary magnetite in ancient zircon precludes analysis of a Hadean geodynamo. Jack HillsProceedings National Academy of Science, Vol. 116, pp. 407-412.Australiapaleomagnetism

Abstract: Zircon crystals from the Jack Hills, Western Australia, are one of the few surviving mineralogical records of Earth’s first 500 million years and have been proposed to contain a paleomagnetic record of the Hadean geodynamo. A prerequisite for the preservation of Hadean magnetization is the presence of primary magnetic inclusions within pristine igneous zircon. To date no images of the magnetic recorders within ancient zircon have been presented. Here we use high-resolution transmission electron microscopy to demonstrate that all observed inclusions are secondary features formed via two distinct mechanisms. Magnetite is produced via a pipe-diffusion mechanism whereby iron diffuses into radiation-damaged zircon along the cores of dislocations and is precipitated inside nanopores and also during low-temperature recrystallization of radiation-damaged zircon in the presence of an aqueous fluid. Although these magnetites can be recognized as secondary using transmission electron microscopy, they otherwise occur in regions that are indistinguishable from pristine igneous zircon and carry remanent magnetization that postdates the crystallization age by at least several hundred million years. Without microscopic evidence ruling out secondary magnetite, the paleomagnetic case for a Hadean-Eoarchean geodynamo cannot yet been made.
DS2001-0378
2001
Harrison, W.E.Gerhard, L.C., Harrison, W.E., Hanson, B.M.Introduction and overview of global climate changeAmerican Association of Petroleum Geologists (AAPG) Book, pp.1-15.GlobalClimatology - brief overview
DS1860-0439
1884
Harrison, W.J.Harrison, W.J.Origin and Home of the DiamondKnowledge., Vol. 7, P. 390.; P. 438.; P. 478.Africa, South AfricaHistory
DS200512-0658
2004
Harrison, W.J.Lowers, H.A., Harrison, W.J., Wendlandt, R.F., Meeker, G.P.Origin of fribrous amphiboles in the Iron Hill carbonatite complex, Gunnison County, Colorado.Geological Society of America Annual Meeting ABSTRACTS, Nov. 7-10, Paper 101-3, Vol. 36, 5, p. 246.United States, ColoradoGeochemistry
DS1860-0339
1880
Harrison, W.P.Harrison, W.P.Mineral Wealth of the State of GeorgiaMineralogical Record, Vol. 8, Nov. 27TH. P. 509; ALSO: LONDON MINING JOURNAL, Vol.United States, GeorgiaDiamond Occurrence
DS1998-0590
1998
Harrod, G.R.Harrod, G.R., Sahm, W.C.Mining information goes 'Real Time'Society for Mining, Metallurgy and Exploration (SME) Preprint, No. 98-113GlobalEconomics, Information - mining
DS1975-0290
1976
Harrower, K.L.Harrower, K.L.Geology and Chronology of Precambrian Basement Rocks in Central Kansas.Msc Thesis, University Kansas, Lawrence., 43P.KansasMid-continent, Kimberley
DS1981-0083
1981
Harrower, K.L.Bickford, M.E., Harrower, K.L., Hoppe, W.J., Nelson, B.K., Nusba.Rubidium-strontium (rb-sr) and U-pb and Geochronology and Distribution of Rock TyGeological Society of America (GSA) Bulletin., Vol. 92, PT. 1, PP. 323-341.GlobalMid-continent
DS1993-0634
1993
Harry, D.L.Harry, D.L., Sawyer, D.S., Leeman, W.P.The mechanics of continental extension in western North America:Earth and Planetary Science Letters, Vol. 117, pp. 59-71Nevada, CordilleraTectonics, Structure Great Basin
DS1993-0903
1993
Harry, D.L.Leeman, W.P., Harry, D.L.A binary source model for extension related magmatism in the Great Basin, western North AmericaScience, Vol. 262, December 3, pp. 1550-1554Cordillera, NevadaGreat Basin, Tectonics
DS1995-0760
1995
Harry, D.L.Harry, D.L., Leeman, W.P.Partial melting of melt metasomatized subcontinental mantle and magmA source potential of lower lithosphere.Journal of Geophysical Research, Vol. 100, No. B6, June 10, pp. 10, 255-10, 270.MantleMetasomatism
DS1995-0761
1995
Harry, D.L.Harry, D.L., Oldow, J.S., Sawyer, D.S.The growth of orogenic belts and the role of crustal heterogeneities indecollement tectonicsGeological Society of America (GSA) Bulletin, Vol. 107, No. 12, Dec. pp. 1411-1426MantleTectonics
DS1999-0294
1999
Harry, D.L.Harry, D.L., Bowling, J.C.Inhibiting magmatism on nonvolcanic rifted marginsGeology, Vol. 27, No. 10, Oct. pp. 895-8.MantleMelting, Magmatism
DS1999-0295
1999
Harry, D.L.Harry, D.L., Green, N.L.Slab dehydration and basalt petrogenesis in subduction systems involving very young oceanic lithosphere.Chemical Geology, Vol. 160, No. 4, Sept. 2, pp. 309-334.MantleLithosphere, Subduction
DS1998-1604
1998
HartWynne, P.J., Enkin, R.J., Baker, Johnston, HartThe big flush: paleomagnetic signature of a 70 Ma regional hydrothermal event in displaced rocks ....Canadian Journal of Earth Sciences, Vol. 35, No. 6, June pp. 657-71.YukonGeophysics - paleomagnetics, Northern Cordillera
DS2001-1086
2001
HartSkovgaard, A.C., Storey, M., Baker, Blusztajn, HartOsmium oxygen isotopic evidence for a recycled and strongly depleted component in the Iceland mantle plumeEarth and Planetary Science Letters, Vol. 194, No. 1-2, pp. 259-75.IcelandPlume, Geochronology
DS200712-0204
2007
HartCourtier, A.M., Jackson, Lawrence, Wang, Lee, Halama, Warren, Workman, Xu, Hirschmann, Larson, Hart, Lithgo-Bertelloni, Stixrude, ChenCorrelation of seismic and petrologic thermometers suggests deep thermal anomalies beneath hotspots.Earth and Planetary Science Letters, Vol. 264, 1-2, pp. 308-316.MantleGeothermometry
DS201112-0414
2011
Hart, B.Hart, B.Diamond window into the lower mantle. ( Juina)Science, Vol. 334, no. 6052, Oct. 7, pp. 51-52.South America, BrazilDiamond genesis
DS1983-0285
1983
Hart, B.R.Hart, B.R.Mineralogical Investigation of the Weathered Portion of The martison Carbonatite.Bsc. Thesis, University Western Ontario, 88P.Canada, Ontario, HearstCarbonatite
DS1989-0594
1989
Hart, B.R.Hart, B.R., Avery, R.W., Dilabio, R.N.W., Coker, W.B.Surficial geology Contwyoto lake 76E/5 to 16Geological Survey of Canada (GSC) Open File, No. 2018, 6 maps 1:50, 000Northwest TerritoriesGeomorphology
DS1993-0474
1993
Hart, B.R.Fyfe, W.S., Powell, M.A., Hart, B.R., Ratanasthien, B.A global crisis: energy in the futureNonrenewable Resources, Vol. 2, No. 3, Fall pp. 187-196GlobalEnergy crisis
DS1970-0305
1971
Hart, C.Hart, C.Recovery of Diamonds 1971India Geological Survey Miscellaneous Publishing, No. 19, PP. 182-190.IndiaMining Engineering, Sampling
DS201512-1899
2015
Hart, C.Bluemel, B., Dunn, C., Hart, C., Leijd, M.Biogeochemical expressions of buried REE mineralization at Norra Karr, southern Sweden.Symposium on critical and strategic materials, British Columbia Geological Survey Paper 2015-3, held Nov. 13-14, pp. 231-240.TechnologyRare earths

Abstract: Biogeochemical exploration is an effective but underutilized method for delineating covered mineralization. Plants are capable of accumulating rare earth elements (REEs) in their tissue, and ferns (pteridophytes) are especially adept because they are one of the most primitive land plants, therefore lack the barrier mechanisms developed by more evolved plants. The Norra Kärr Alkaline Complex, located in southern Sweden approximately 300km southwest of Stockholm, is a peralkaline nepheline syenite enriched in heavy rare earth elements (HREEs). The deposit, roughly 300m wide, 1300m long, and overlain by up to 4 m of Quaternary sediments, has been well-defined by diamond drilling. The inferred REE mineral resource, over 60 million tonnes averaging 0.54% Total Rare Earth Oxide (TREO), is dominantly hosted within the pegmatitic “grennaite” unit, a eudialyte-catapleiite-aegerine nepheline syenite. Vegetation and soil samples were collected from the surficial environment above Norra Kärr to address four key questions: which plant species is the most effective biogeochemical exploration medium; what are the annual and seasonal REE variations in that plant; how do the REEs move through the soil profile; and into which part of the plant are they concentrated. Athyrium filix-femina (lady fern) has the highest concentration of LREEs and HREEs (up to 125.17ppm Ce and 1.03ppm Dy) in its dry leaves; however, there is better contrast between background and anomalous areas in Dryopteris filix-mas (wood fern), which makes it the preferred biogeochemical sampling medium. The REE content in all fern species was shown to decrease from root > frond > stem, and chondrite normalized REE patterns within the plant displayed preferential fractionation of the LREEs in the fronds relative to the roots. Samples collected from an area directly overlying the deposit had up to five times greater HREE content (0.74ppm Dy) in August than the same plants did in June (0.14ppm Dy). The elevated REE content and distinct contrast to background demonstrate that biogeochemical sampling is an effective method for REE exploration in this environment.
DS2002-0659
2002
Hart, C.J.R.Hart, C.J.R., McCoy, D.T., Goldfarb, Smith, RobertsGeology, exploration and discovery in the Tintin a gold province Alaska and YukonSociety of Economic Geologists Special Publication, No.9,pp.241-74.Yukon, AlaskaGold, Deposit - Tintina area
DS201607-1301
2016
Hart, E.Hart, E., Storey, C., Bruand, E., Schertl, H-P., Alexander, B.D.Mineral inclusions in rutile: a novel recorder of HP-UHP.Earth and Planetary Science Letters, Vol. 446, pp. 137-148.MantleCoesite, subduction

Abstract: The ability to accurately constrain the secular record of high- and ultra-high pressure metamorphism on Earth is potentially hampered as these rocks are metastable and prone to retrogression, particularly during exhumation. Rutile is among the most widespread and best preserved minerals in high- and ultra-high pressure rocks and a hitherto untested approach is to use mineral inclusions within rutile to record such conditions. In this study, rutiles from three different high- and ultrahigh-pressure massifs have been investigated for inclusions. Rutile is shown to contain inclusions of high-pressure minerals such as omphacite, garnet and high silica phengite, as well as diagnostic ultrahigh-pressure minerals, including the first reported occurrence of exceptionally preserved monomineralic coesite in rutile from the Dora -Maira massif. Chemical comparison of inclusion and matrix phases show that inclusions generally represent peak metamorphic assemblages; although rare prograde phases such as titanite, omphacite and corundum have also been identified implying that rutile grows continuously during prograde burial and traps mineralogic evidence of this evolution. Pressure estimates obtained from mineral inclusions, when used in conjunction with Zr-in-rutile thermometry, can provide additional constraints on the metamorphic conditions of the host rock. This study demonstrates that rutile is an excellent repository for high- and ultra-high pressure minerals and that the study of mineral inclusions in rutile may profoundly change the way we investigate and recover evidence of such events in both detrital populations and partially retrogressed samples.
DS2003-0559
2003
Hart, G.L.Hart, G.L., Johnon, C.M., Hildreth, W., Shirey, S.B.New osmium isotope evidence for intracrustal recycling of crustal domains with discreteGeology, Vol. 31, 5, pp. 427-30.mantleGeochronology
DS200412-0801
2003
Hart, G.L.Hart, G.L., Johnon, C.M., Hildreth, W., Shirey, S.B.New osmium isotope evidence for intracrustal recycling of crustal domains with discrete ages.Geology, Vol. 31, 5, pp. 427-30.TechnologyMantle Geochronology
DS1991-1762
1991
Hart, J.Umpherson, D., Bennett, D., Webb, J.R., Hart, J.Bush safety in mineral explorationMinistry of Northern Development and Mines Education series, No. 2, 67pOntarioManual for safety, book, Mineral exploration -safety measures
DS1997-0480
1997
Hart, M.Hart, M.Plunder Inc. Canadians are outgunning de Beers in the increasingly bloody world of diamond mining.Saturday Night, July/Aug. pp. 19-25.AngolaNews item, SouthernEra Ltd.
DS1997-0481
1997
Hart, M.Hart, M.Rough on the Tundra.... overview of BHP-Dia Met diamond mineRapaport Diamond Report, Oct. 10, pp. 75-77.Northwest TerritoriesNews item, BHP, Dia Met
DS1999-0296
1999
Hart, M.Hart, M.How to steal a diamondAtlantic Monthly, Vol. 283, No. 4, March pp. 28, 30, 32, 34.South Africa, AfricaDiamond theft, Overview - layman
DS2001-0453
2001
Hart, M.Hart, M.A journey to the Heart of an obsessionPenguin Books, Brazil, Northwest TerritoriesBook - history, current exploration
DS2001-0454
2001
Hart, M.Hart, M.Waiting for the next strike... exploration companies have turned from Arctic to Ontario, Quebec, Prairies.Canadian Diamonds Magazine, Fall, pp. 23-26.Ontario, Quebec, Alberta, SaskatchewanNews item, Brief overview
DS201908-1797
2019
Hart, M.Murri, M., Smith, R.L., McColl, K., Hart, M., Alvaro, M., Jones, A.P., Nemeth, P., Salzmann, C.G., Cora, F., Domeneghetti, M.C., Nestola, F., Sobolev, N.V., Vishnevsky, S.A., Logvinova, A.M., McMillan, P.F.Quantifying hexagonal stacking in diamond. ( lonsdaleite)Nature Scientific Reports, doi.org/10.1038/ s41598-019-46556-3 8p. PdfGlobaldiamond morphology, impact craters

Abstract: Diamond is a material of immense technological importance and an ancient signifier for wealth and societal status. In geology, diamond forms as part of the deep carbon cycle and typically displays a highly ordered cubic crystal structure. Impact diamonds, however, often exhibit structural disorder in the form of complex combinations of cubic and hexagonal stacking motifs. The structural characterization of such diamonds remains a challenge. Here, impact diamonds from the Popigai crater were characterized with a range of techniques. Using the MCDIFFaX approach for analysing X-ray diffraction data, hexagonality indices up to 40% were found. The effects of increasing amounts of hexagonal stacking on the Raman spectra of diamond were investigated computationally and found to be in excellent agreement with trends in the experimental spectra. Electron microscopy revealed nanoscale twinning within the cubic diamond structure. Our analyses lead us to propose a systematic protocol for assigning specific hexagonality attributes to the mineral designated as lonsdaleite among natural and synthetic samples.
DS202011-2054
2020
Hart, M.Murri, M., Smith, R.L., McColl, K., Hart, M., Alvaro, M., Jones, A.P., Nemeth, P., Salzmann, C.G., Cora, F., Domeneghetti, M.C., Nestola, F., Sobolev, N.V., Vishnevsky, S.A., Logvinova, A.M., McMillan, P.F.Quantifying hexagonal stacking in diamond.Nature/scientific reports, 8p. PdfGlobalcrystallography

Abstract: Diamond is a material of immense technological importance and an ancient signifier for wealth and societal status. In geology, diamond forms as part of the deep carbon cycle and typically displays a highly ordered cubic crystal structure. Impact diamonds, however, often exhibit structural disorder in the form of complex combinations of cubic and hexagonal stacking motifs. The structural characterization of such diamonds remains a challenge. Here, impact diamonds from the Popigai crater were characterized with a range of techniques. Using the MCDIFFaX approach for analysing X-ray diffraction data, hexagonality indices up to 40% were found. The effects of increasing amounts of hexagonal stacking on the Raman spectra of diamond were investigated computationally and found to be in excellent agreement with trends in the experimental spectra. Electron microscopy revealed nanoscale twinning within the cubic diamond structure. Our analyses lead us to propose a systematic protocol for assigning specific hexagonality attributes to the mineral designated as lonsdaleite among natural and synthetic samples.
DS1983-0286
1983
Hart, P.W.Hart, P.W., Bate, R.L.Diamonds; Geology of the Nonmetallics, 1983Geology of The Nonmetallics, Metal Bulletin. Incv., PP. 148-158.GlobalHistory, Geology, Kimberley
DS1993-0336
1993
Hart, R.A.De Wit, M.J., Hart, R.A.Earth's earliest continental lithosphere, hydrothermal flux and crustalrecyclingLithos, Vol. 30, No. 3-4, September pp. 309-336MantleCrustal recycling, Thermometry, Lithosphere
DS1990-0666
1990
Hart, R.J.Hart, R.J., Andreoli, M.A.G., Smith, C.B., Otter, M.L., DurrheimUltramafic rocks in the centre of the Vredefort structure (South Africa):possible exposure of the upper mantleChem. Geol, Vol. 83, No. 3/4, June 25, pp. 233-248South AfricaUltramafics, Mantle - Vredefort structure
DS1990-0667
1990
Hart, R.J.Hart, R.J., Andreoli, M.A.G., Tredoux, M., De Wit, M.J.Geochemistry across an exposed section of Archean crust at Vredefort, SouthAfrica: with implications for mid- crustal discontinuitiesChemical Geology, Vol. 82, No. 1/2, March 30, pp. 21-50South AfricaGeochemistry, Tectonics
DS1991-0676
1991
Hart, R.J.Hart, R.J., Andreoli, M.A.G., Reimold, W.U., Tredoux, M.Aspects of the dynamic and thermal metamorphic history of the Vredefort cryptoexplosion structure -implications for its originTectonophysics, Vol. 192, No. 3-4, June 20, pp. 313-358South AfricaCryptoexplosion, Geothermometry
DS1991-0677
1991
Hart, R.J.Hart, R.J., Damarupurshad, A., Sellschop, J.P.F., Meyer, H.O.A.The trace element analysis of single diamond crystal by neutron activationanalysisProceedings of Fifth International Kimberlite Conference held Araxa June 1991, Servico Geologico do Brasil (CPRM) Special, pp. 163-166Colorado, Brazil, South AfricaDiamond morphology, Geochemistry, George Creek, Romaria, Finsch
DS1992-0352
1992
Hart, R.J.De Wit, M.J., Roering, C., Hart, R.J., Armstrong, R.A., et al.Formation of an Archean continent #1Nature, Vol. 357, No. 6379, June 18, pp. 553-562South AfricaArchean continent, Structure
DS1994-0370
1994
Hart, R.J.Damarapurshad, A.K., Hart, R.J., Meyer, H.O.Geochemistry of single diamonds by instrumental neutron activationanalysis.International Symposium Upper Mantle, Aug. 14-19, 1994, Extended abstracts pp. 24-26.Brazil, South Africa, Colorado, ChinaGeochemistry, Trace elements in diamonds
DS1994-1147
1994
Hart, R.J.McDonald, I., Hart, R.J., Tredoux, M.Determination of platinum group elements (PGE)'sin South African kimberlites by nickel sulfide fine assay and neutron activation analysis.Analytical Chim., Vol. 289, No. 2, Apr. 29, pp. 237-249.South AfricaKimberlites, PlatinuM.
DS1995-0382
1995
Hart, R.J.Damarupurshad, A.K., Hart, R.J., Smith, C.B.Distinguishing between Diamondiferous and barren kimberlitic rocks on the basis of whole rock analysis.Exploration and Mining Geology, Vol. 4, No. 1, p. 84.AustraliaGeochemistry -whole rock, Multivariant discriminate analysis
DS1995-0762
1995
Hart, R.J.Hart, R.J., De Wit, M.J., Tredoux, M.Refractory trace elements in diamonds: further clues to the origins of ancient cratons.Geological Society Africa 10th. Conference Oct. Nairobi, pp. 77-8. Abstract.South AfricaDiamond inclusions, Craton -Kaapvaal
DS1995-0763
1995
Hart, R.J.Hart, R.J., Hargraves, R.B., Andreoli, M.A.G., TredouxMagnetic anomaly near the center of the Vredefort structure: Implications for impact related signatures.Geology, Vol. 23, No. 3, March pp. 277-280.South AfricaGeophysics -magnetics, Impact Vredefort
DS1995-0764
1995
Hart, R.J.Hart, R.J., Hargraves, R.B., Andreoli, M.A.G., Tredoux, M.Magnetic anomaly near center Vredefort structure: implications for impact related magnetic signaturesGeology, Vol. 23, No. 3, March pp. 277-280South AfricaPaleomagnetics - remanent, Impact - Vredefort
DS1997-0482
1997
Hart, R.J.Hart, R.J., Tredoux, M., De Wit, M.J.Refractory trace elements in diamond inclusions: further clues to the origins of the ancient cratons.Geology, Vol. 25, No. 12, Dec. pp. 1143-46.South Africa, BrazilEclogites, Peridotites, silicate, sulphide, Deposit - Finch, Premier
DS1998-1048
1998
Hart, R.J.Moser, D.E., Hart, R.J.Neoarchean and Paleoproterozoic re-activation of the crust mantle transition beneath the Kaapvaal Craton.7th International Kimberlite Conference Abstract, pp. 609-1.South AfricaGeochronology - zircon, Deposit - Lace
DS1999-0743
1999
Hart, R.J.Tredoux, M., Hart, R.J., Carlosn, R.W., Shirey, S.B.Ultramafic rocks at the center of the Vredefort structure: further evidence for the crust in edge modelGeology, Vol. 27, No. 10, Oct. pp. 923-6.South AfricaMantle rocks, Geochronology
DS2001-0807
2001
Hart, R.J.Moser, D., Hart, R.J., Flowers, R.M.Birth and modification of Kaapvaal tectosphere: constraints Vredefort section and Lace kimberliteSlave-Kaapvaal Workshop, Sept. Ottawa, 4p. abstractSouth AfricaXenoliths, Deposit - Lace
DS2001-0808
2001
Hart, R.J.Moser, D.E., Flowers, R.M., Hart, R.J.Birth of the Kaapvaal tectonosphere 3.08 Billion years agoScience, Vol. 291, No. 5503, Jan. 19, pp. 465-7.South AfricaCraton - Kaapvaal, Tectonics
DS200612-0026
2006
Hart, R.J.Andreoli, M.A.G., Hart, R.J., Ashwal, L.D., Coetzee, H.Correlations between U, Th content and metamorphic grade in the Western Namaqualand Belt, South Africa: with implications for radioactive heating of the crust.Journal of Petrology, Vol. 47, 6, pp. 1095-1118.Africa, South AfricaGeothermometry
DS200712-0767
2007
Hart, R.J.Muundjua, M., Hart, R.J., Gilder, S.A., Carporzen, L., Galdeano, A.Magnetic imaging of the Vredefort impact crater, South Africa.Earth and Planetary Science Letters, Vol. 261, 3-4, pp. 456-468.Africa, South AfricaGeophysics
DS1993-0263
1993
Hart, S.Clifford, N.J., Hardisty, J., French, J.R., Hart, S.Down stream variation in bed material characteristics: a turbulence controlled form process feedback mechanismBest, and Bristow, Braided Rivers Geological Society of London, No. 75, pp. 89-104GlobalSedimentology, Geomorphology, Braided rivers
DS2003-0974
2003
Hart, S.Moreira, M., Blusztajn, J., Curtice, J., Hart, S., Dick, H., KurzHe and Ne isotopes in oceanic crust: implications for noble gas recycling in the mantleEarth and Planetary Science Letters, Vol. 216, 4, pp. 635-43.MantleGeochronology
DS200412-1365
2003
Hart, S.Moreira, M., Blusztajn, J., Curtice, J., Hart, S., Dick, H., KurzHe and Ne isotopes in oceanic crust: implications for noble gas recycling in the mantle.Earth and Planetary Science Letters, Vol. 216, 4, pp. 635-43.MantleGeochronology
DS200612-0542
2006
Hart, S.Hart, S., Gaetani, G.Mantle lead paradoxes: the sulphide solution.Contributions to Mineralogy and Petrology, Vol. 152, 3, pp. 295-308.MantleGeochemistry
DS1998-0727
1998
Hart, S.B.Kelemen, P.B., Hart, S.B., Bernstein, S.Silica enrichment in the continental upper mantle via melt/rock reactionEarth and Planetary Science Letters, Vol.164, No.1-2, Dec.15, pp.387-406.MantleSilica, Melt
DS1975-1056
1979
Hart, S.R.Hart, S.R., Padovani, E.R., Roden, H.K.Strontium Isotopic Relationships in Lower Crustal Nodules from Kilbourne Hole, New Mexico.Geological Society of America (GSA), Vol. 11, No. 7, P. 439. (abstract.).United States, New Mexico, Colorado PlateauBlank
DS1982-0517
1982
Hart, S.R.Reid, M., Hart, S.R., Padovani, E.Evolution of the Lower Crust Beneath Kilbourne Hole, New Mexico.Geological Society of America (GSA), Vol. 14, No. 7, P. 597, (abstract.).GlobalKimberlite, Rocky Mountains, Colorado Plateau
DS1985-0558
1985
Hart, S.R.Reid, M., Hart, S.R.Importance of Sedimentary Protoliths to the Lower Crust Exemplified by the Kilbourne Hole Paragenesis- Sr-neodymium-palladium Isotopegeochemistry.Eos, Vol. 66, No. 46, NOVEMBER 12, P. 1110. (abstract.).United States, Colorado Plateau, New MexicoGeochemistry
DS1985-0560
1985
Hart, S.R.Richardson, S.H., Erlank, A.J., Hart, S.R.Kimberlite borne garnet peridotite xenoliths from old enriched subcontinental lithosphereEarth Planet. Sci. Letters, Vol. 75, No. 2-3, Oct. pp. 116-128GlobalMantle
DS1986-0343
1986
Hart, S.R.Hart, S.R., Gerlach, D.C., White, M.W.A possible new Strontium neodymium lead mantle array and consequences for mantle mixingGeochimica et Cosmochimica Acta, Vol. 50, No. 7, July pp. 1551-1557GlobalMantle
DS1986-0628
1986
Hart, S.R.Padovani, E.R., Wandless, G.A., Reid, M., Hart, S.R.Characterization of the deep crust in an active intracontinental rift:evidence from xenoliths at Kilbourne Hole MaarGeological Society of America, Vol. 18, No. 2, p. 168. AbstractGlobalTectonics
DS1988-0291
1988
Hart, S.R.Hart, S.R., Gulen, L.Crust/Mantle recycling at convergent zonesD. Reidel Publishing Co., Nato Series, Asi C, Math. Phys. Sci., Vol. 258, 280p. approx. $ 80.00 United StatesGlobalMantle, Book -Table of contents
DS1989-1327
1989
Hart, S.R.Salters, V.J.M., Hart, S.R.The hafnium paradox and the role of garnet in the source of mid ocean ridgebasalts.Nature, Vol. 342, Nov. 23, pp. 420-22.MantleMid Ocean Ridge Basalt (MORB) - basalts, geochemistry
DS1990-1225
1990
Hart, S.R.Richardson, S.H., Erlank, A.J., Harris, J.W., Hart, S.R.Eclogitic diamonds of Proterozoic age from Cretaceous kimberlitesNature, Vol. 346, No. 6279, July 5, pp. 54-56South Africa, BotswanaGeochronology, Eclogitic diamonds
DS1993-0640
1993
Hart, S.R.Hauri, E.H., Shimizu, N., Dieu, J.J., Hart, S.R.Evidence for hotspot related carbonatite metasomatism in the oceanic uppermantle.Nature, Vol. 365, No. 6443, Sept. 16, pp. 221-227.MantleCarbonatite, Hotspot
DS1994-0725
1994
Hart, S.R.Hart, S.R.Mantle plumes and other mail from the mantleMineralogical Magazine, Vol. 58A, pp. 382-383. AbstractMantlePlumes, Dupal anomaly
DS1994-0726
1994
Hart, S.R.Hart, S.R., Steinhart, J.S., Smith, T.J.Terrestrial heat flow in Lake SuperiorCanadian Journal of Earth Sciences, Vol. 31, No. 4, April pp. 698-708Ontario, MichiganHeat flow
DS1994-0727
1994
Hart, S.R.Hart, S.R., Steinhart, J.S., Smith, T.J.Terrestrial heat flow in Lake SuperiorCanadian Journal of Earth Sciences, Vol. 31, No. 4, April pp. 698-708.Ontario, MichiganHeat flow
DS1994-1374
1994
Hart, S.R.Peucker-Ehrebrink, B., Hofmann, A.W., Hart, S.R.Hydrothermal lead transfer from mantle to continental crust: the role of metalliferous sedimentsEarth and Planetary Science Letters, Vol. 125, pp. 129-142MantleHydrothermal, Alteration
DS1994-1648
1994
Hart, S.R.Snow, J.E., Hart, S.R., Dick, H.J.B.neodymium and Strontium isotope evidence linking mid-ocean ridge basalts and abyssal peridotitesNature, Vol. 371, Sept. 1, pp. 57-60GlobalPeridotites, Geochronology
DS1995-0765
1995
Hart, S.R.Hart, S.R.Mantle plums and mantle plumes: a chemical geodynamic viewEos, Abstracts, Vol. 76, No. 17, Apr 25, p. S 292.MantlePlumes
DS1995-0766
1995
Hart, S.R.Hart, S.R., Blusztajn, J., Craddock, C.Cenozoic volcanism in Antarctica: Jones Mountains and Peter I IslandGeochimica et Cosmochimica Acta, Vol. 59, No. 16, August 1, pp. 3379-88.Antarcticavolcanism., Alkaline rocks
DS1996-0612
1996
Hart, S.R.Hattori, K., Hart, S.R., Shimizu, N.Melt and source mantle compositions in Late Archean: a study of strontium neodymium isotope trace elements.Geochimica et Cosmochimica Acta, Vol. 60, No. 22, pp. 4551-62.QuebecLamprophyryes, clinopyroxenes, shoshonites, Geochemistry - alkaline rocks
DS1998-1273
1998
Hart, S.R.Saal, A.E., Rudnick, R.L., Ravizza, G.E., Hart, S.R.Re - Os isotope evidence for the composition, formation and age of the lower continental crustNature, Vol. 393, No. 6680, May pp. 58-60GlobalGeochronology
DS200512-1058
2005
Hart, S.R.Stracke, A., Hofmann, A.W., Hart, S.R.FOZO, HIMU and the rest of the mantle zoo.Geochemistry, Geophysics, Geosystems: G3, Vol. 6, doi:10.1029/2004 GC000824MantleUHP
DS200512-1196
2005
Hart, S.R.Workman, R.K., Hart, S.R.Major and trace element composition of the depleted MORB mantle ( DMM).Earth and Planetary Science Letters, Vol. 231, 1-2, Feb. 28, pp. 53-72.MantleGeochemistry - DMM
DS200612-0543
2006
Hart, S.R.Hart, S.R., Gaetani, G.A.Mantle Pb paradoxes: the sulfide solution.Contributions to Mineralogy and Petrology, in press availableMantlePetrology - peridotites and lead
DS200612-1311
2006
Hart, S.R.Sims, K.W.W., Hart, S.R.Comparison of Th, Sr Nd and Pb isotopes in oceanic basalts: implications for mantle heterogeneity and magma genesis.Earth and Planetary Science Letters, Vol. 245, 3-4, May 30, pp. 743-761.MantleGeochronology
DS200612-1557
2006
Hart, S.R.Xu, Y.G., Blusztajn, J., Ma, J.L., Hart, S.R.In searching for old lithospheric relict beneath North Chin a Craton: Sr Nd Os isotopic composition of peridotite xenoliths from Yangyuan.Geochimica et Cosmochimica Acta, Vol. 70, 18, p. 3. abstract only.ChinaGeochronology
DS200812-0449
2008
Hart, S.R.Hart, S.R., Kurz, M.D., Wang, Z.Scale length of mantle heterogeneities: constraints from helium diffusion.Earth and Planetary Science Letters, Vol. 269, 3-4, pp. 507-516.MantleGeochemistry - helium
DS200812-1284
2008
Hart, S.R.Xu, Y-G., Blusztajn, J., Ma, J-L., Suzuki, K., Liu, J.F., Hart, S.R.Late Archean to Early Proterozoic lithospheric mantle beneath the western North Chin a craton: Sr Nd Os isotopes of peridotite xenoliths from Yangyuan and FansiLithos, Vol. 102, 3-4, pp.25-42.ChinaGeochronology
DS201602-0196
2016
Hart, S.R.Cagney, N., Crameri, F., Newsome, W.H., Lithgow-Bertelloni, C., Cotel, A., Hart, S.R., Whitehead, J.A.Constraining the source of mantle plumes.Earth and Planetary Science Letters, Vol. 435, 1, pp. 55-63.MantlePlume

Abstract: In order to link the geochemical signature of hot spot basalts to Earth's deep interior, it is first necessary to understand how plumes sample different regions of the mantle. Here, we investigate the relative amounts of deep and shallow mantle material that are entrained by an ascending plume and constrain its source region. The plumes are generated in a viscous syrup using an isolated heater for a range of Rayleigh numbers. The velocity fields are measured using stereoscopic Particle-Image Velocimetry, and the concept of the ‘vortex ring bubble’ is used to provide an objective definition of the plume geometry. Using this plume geometry, the plume composition can be analysed in terms of the proportion of material that has been entrained from different depths. We show that the plume composition can be well described using a simple empirical relationship, which depends only on a single parameter, the sampling coefficient, scsc. High-scsc plumes are composed of material which originated from very deep in the fluid domain, while low-scsc plumes contain material entrained from a range of depths. The analysis is also used to show that the geometry of the plume can be described using a similarity solution, in agreement with previous studies. Finally, numerical simulations are used to vary both the Rayleigh number and viscosity contrast independently. The simulations allow us to predict the value of the sampling coefficient for mantle plumes; we find that as a plume reaches the lithosphere, 90% of its composition has been derived from the lowermost 260–750 km in the mantle, and negligible amounts are derived from the shallow half of the lower mantle. This result implies that isotope geochemistry cannot provide direct information about this unsampled region, and that the various known geochemical reservoirs must lie in the deepest few hundred kilometres of the mantle.
DS200512-0270
2005
Hart, T.R.Ernst, R.E., Buchan, K.L., Hart, T.R., Morgan, J.North trending diabase dykes west of the Nipigon embayment: paleomagnetism, geochemistry and correlation with known magmatic events.GAC Annual Meeting Halifax May 15-19, Abstract 1p.Canada, OntarioEmpey Lake dyke swarm, Mine Centre, magmatism
DS1990-0360
1990
Hart, W.K.Cooper, J.L., Hart, W.K.Mantle sources in the Arizona transition zone and global mantleheterogeneityGeology, Vol. 18, No. 11, November pp. 1146-1149ArizonaMantle
DS1990-0361
1990
Hart, W.K.Cooper, J.l., Hart, W.K.Xenoliths and basaltic lavas from the Colorado Plateau transition zone: acombined investigationEos, Vol. 71, No. 17, April 24, p. 658 Abstract onlyColorado PlateauAlkaline rocks, Xenoliths
DS1992-0933
1992
Hart, W.K.Leeman, W.P., Oldow, J.S., Hart, W.K.Lithosphere-scale thrusting in the western U.S. Cordillera as constrained by Sr and neodymium isotopic transitions in Neogene volcanic rocksGeology, Vol. 20, No. 1, January pp. 63-66Idaho, Oregon, NevadaGeochronology, Tectonics -thrusts
DS1994-0728
1994
Hart, W.K.Hart, W.K.Rhenium-osmium investigation of lithosphere processes in southeastern Colorado Plateau transition zone.Geological Society of America (GSA) Abstract Volume, Vol. 26, No. 7, ABSTRACT only p. A38.Colorado PlateauLithosphere, Geochronology
DS2002-0572
2002
HarteGillet, P., Sautter, V., Harris, Reynard, Harte, KunzRaman spectroscopic study of garnet inclusions in diamonds from the mantle transition zone.American Mineralogist, Vol.87, 2-3, pp. 312-17.BrazilSpectroscopy - majoritic content, Deposit - Sao Luiz
DS1970-0653
1973
Harte, B.Cox, K.G., Gurney, J.J., Harte, B.Xenoliths from the Matsoku PipeMaseru: Lesotho Nat. Dev. Corp. Lesotho Kimberlites Editor N, PP. 76-100.LesothoGeology, Petrography, Texture, Buckmann, Mineral Chemistry
DS1970-0702
1973
Harte, B.Gurney, J.J., Harte, B., Cox, K.G.The Composition of the Mantle Xenoliths in the Matsoku Pipe1st International Kimberlite Conference, EXTENDED ABSTRACT VOLUME PP. 139-142.LesothoMineralogy
DS1970-0709
1973
Harte, B.Harte, B., Cox, K.G., Gurney, J.J.Petrography and Geological History of Upper Mantle Xenoliths from the Matsoku Kimberlite Pipe #11st International Kimberlite Conference, EXTENDED ABSTRACT VOLUME, PP. 155-158.LesothoPetrography
DS1970-0710
1973
Harte, B.Harte, B., Gurney, J.J.Evolution of Clinopyroxene and Garnet in an Eclogite Nodule from the Roberts Victor Kimberlite Pipe.1st International Kimberlite Conference, EXTENDED ABSTRACT VOLUME, PP. 159-162.South AfricaMineralogy, Xenoliths
DS1975-0093
1975
Harte, B.Gurney, J.J., Harte, B., Cox, K.G.The Composition of Mantle Xenoliths in the Matsoku PipePhysics and Chemistry of the Earth., Vol. 9, PP. 507-524.LesothoPetrography, Mineral Chemistry
DS1975-0097
1975
Harte, B.Harte, B., Cox, K.G., Gurney, J.J.Petrography and Geological History of Upper Mantle Xenoliths from the Matsoku Kimberlite Pipe #2Physics and Chemistry of the Earth., Vol. 9, PP. 477-506.LesothoPetrography, Geology
DS1975-0098
1975
Harte, B.Harte, B., Gurney, J.J.Ore Mineral and Phlogopite Mineralization Within Ultramafic nodules from the Matsoku Kimberlite Pipe.Carnegie Institute Yearbook, FOR 1974, PP. 528-536.LesothoPetrography
DS1975-0099
1975
Harte, B.Harte, B., Gurney, J.J.Evolution of Clinopyroxene and Garnet in Eclogite Nodule From the Roberts Victor Kimberlite Pipe.Physics and Chemistry of the Earth., Vol. 9, PP. 367-387.South AfricaMineral Chemistry, Petrography
DS1975-0521
1977
Harte, B.Harte, B.Rock Nomenclature with Particular Relation to Deformation And Recrystallisation Textures in Olivine Bearing Xenoliths.Journal of Geology, Vol. 85, No. 3, PP. 279-288.South AfricaKimberlite Classification
DS1975-0522
1977
Harte, B.Harte, B., et al.Clinopyroxene Rich Sheets in Garnet Peridotite Xenolith Specimens from the Matsuko Kimberlite Pipe.Proceedings of Second International Kimberlite Conference, EXTENDED ABSTRACT VOLUME.LesothoMineral Chemistry, Petrography
DS1980-0155
1980
Harte, B.Gurney, J.J., Harte, B.Chemical Variation in Upper Mantle Nodules from Southern African Kimberlites.Royal Society of London PHIL. Transactions, Vol. 297, No. 1431, PP. 273-294.South AfricaMineral Chemistry
DS1980-0162
1980
Harte, B.Harte, B., Gurney, J.J., Harris, J.W.The Formation of Peridotitic Suite Inclusions in DiamondsContributions to Mineralogy and Petrology, Vol. 72, pp. 181-90.South Africa, TanzaniaPeridotite, Diamond Inclusions
DS1981-0204
1981
Harte, B.Harte, B., Gurney, J.J.The Mode of Formation of Chromium Poor Megacryst Suites From Kimberlites.Journal of GEOLOGY, Vol. 89, No. 6, PP. 749-753.South AfricaKimberlite, Genesis, Model
DS1982-0254
1982
Harte, B.Harte, B., Gurney, J.J.Compositional and Textural Features of Peridotite Nodules from the jagersfontein Kimberlite Pipe, South Africa.Proceedings of Third International Kimberlite Conference, TERRA, Vol. 2, No. 3, PP. 256-257, (abstract.).South AfricaKimberlite
DS1983-0287
1983
Harte, B.Harte, B.Mantle Peridotites and Processes- the Kimberlite SampleCheshire: Shiva Publishing, Continental Basalts And Mantle Xenoli, PP. 46-91.GlobalGenesis, Classification, Megacryst, Elements, Metasomatism
DS1984-0345
1984
Harte, B.Harte, B.The Distinction of Different Sources of Mantle Material Within the Kimberlite Sample.International Geological Congress, 27TH., Vol. 9, PT. 1, PP. 79-80. (abstract.).GlobalMineralogy
DS1986-0344
1986
Harte, B.Harte, B.Genesis of diamonds: a mantle saga- distorted in the tellingAmerican Mineralogist, Vol. 71, pp. 1258-1260GlobalDiamond morphology
DS1986-0345
1986
Harte, B.Harte, B.The nature of the upper mantle and lower crustProceedings of the Fourth International Kimberlite Conference, Held Perth, Australia, No. 16, pp. 224-227GlobalReview paper
DS1986-0346
1986
Harte, B.Harte, B.Speculations concerning the importance of metasomatic melt migration In the formation of pyroxenite sheets in garnet peridotite xenoliths from MatsokuLesProceedings of the Fourth International Kimberlite Conference, Held Perth, Australia, No. 16, pp. 184-186LesothoXenoliths
DS1986-0370
1986
Harte, B.Hops, J.J., Gurney, J.J., Harte, B.Megacrysts and deformed nodules from the Jagersfontein kimberlite pipeProceedings of the Fourth International Kimberlite Conference, Held Perth, Australia, No. 16, pp. 256-258South AfricaBlank
DS1986-0704
1986
Harte, B.Sautter, V., Harte, B.Chemical equilibrium and diffusion gradients in eclogite xenolith JJG 41:an isothermal model for exsolution reactionProceedings of the Fourth International Kimberlite Conference, Held Perth, Australia, No. 16, pp. 315-317South AfricaBlank
DS1987-0277
1987
Harte, B.Harte, B.Metasomatic events recorded in mantle xenoliths: an overviewin: Nixon, P.H. ed. Mantle xenoliths, J. Wiley, pp. 625-640GlobalBlank
DS1987-0278
1987
Harte, B.Harte, B., Winterburn, P.A., Gurney, J.J.Metasomatic and enrichment phenomena in garnet peridotite facies mantle xenoliths from the Matsoku kimberlite pipe, LesothoIn: Mantle Metasomatism, edited M.A. Menzies, C.J. Hawkesworth, Academic, pp. 145-220LesothoBlank
DS1988-0611
1988
Harte, B.Sautter, V., Harte, B.Diffusion gradients in an eclogite xenolith from theRoberts Victorkimberlite pipe: 1. Mechanism- Evolution of garnet exsolution in Al2O3 richclinopyroxeneJournal of Petrology, Vol. 29, No. 6, December pp. 1325-1352South AfricaXenoliths, Analyses
DS1989-0595
1989
Harte, B.Harte, B., Hawkesworth, C.J.Mantle domains and mantle xenolithsGeological Society of Australia Inc. Blackwell Scientific Publishing, Special, No. 14, Vol. 2, pp. 649-686GlobalReview paper -mantle xenoliths, Xenoliths
DS1989-0660
1989
Harte, B.Hops, J.J., Gurney, J.J., Harte, B., Winterburn, P.Megacrysts and high temperature nodules from the Jagersfontein kimberliteGeological Society of Australia Inc. Blackwell Scientific Publishing, Special, No. 14, Vol. 2, pp. 759-770South AfricaPetrography, Geothermobarometry
DS1989-1625
1989
Harte, B.Wilding, M.C., Harte, B., Harris, J.W.Evidence of asthenospheric source for diamonds from Brasil28th. International Geological Congress, Held Washington Dc., Vol. 3, pp. 359-360. AbstractBrazilMantle, Diamond genesis
DS1990-0668
1990
Harte, B.Harte, B.High temperature granulites - discussion and reply by Hayob et alNature, Vol. 347, No. 6289, September 13, pp. 132-134GlobalGranulites, Petrology
DS1990-1304
1990
Harte, B.Sautter, V., Harte, B.Diffusion gradients in an eclogite xenolith from the Roberts Victorkimberlite pipe: (2) kinetics and implications for petrogenesisContributions to Mineralogy and Petrology, Vol. 105, pp. 637-649South AfricaEclogite, Roberts Victor
DS1990-1571
1990
Harte, B.Winterburn, P.A., Harte, B., Gurney, J.J.Peridotite xenoliths from the Jagersfontein kimberlite pipe: 1. Primary and primary-metasomatic mineralogyGeochimica et Cosmochimica Acta, Vol. 54, pp. 329-341South AfricaXenolith mineralogy, Deposit - Jagersfontein
DS1991-0678
1991
Harte, B.Harte, B., Matthews, M.B., Winterburn, P.A., Gurney, J.J.Aspects of melt composition, crystallization, metasomatism anddistribution, shown by mantle xenoliths from the Matsoku kimberlite pipeProceedings of Fifth International Kimberlite Conference held Araxa June 1991, Servico Geologico do Brasil (CPRM) Special, pp. 167-169South AfricaMantle, Metasomatism
DS1991-1254
1991
Harte, B.Olding, N.W.A., Green, D.H., Harte, B.The composition of partial melts in a volatile bearing reduced mantleProceedings of Fifth International Kimberlite Conference held Araxa June 1991, Servico Geologico do Brasil (CPRM) Special, pp. 313-315GlobalExperimental petrology, Xenoliths, partial melt composition
DS1991-1274
1991
Harte, B.Otter, M.L., Gemeke, D.A., Harte, B., Gurney, J.J., Harris, J.W.Diamond growth histories revealed by cathodluminescence and carbon isotopestudiesProceedings of Fifth International Kimberlite Conference held Araxa June 1991, Servico Geologico do Brasil (CPRM) Special, pp. 318-319Southern AfricaPremier, Bultfontein, Finsch, Koffiefontein, Geochronology
DS1991-1856
1991
Harte, B.Wilding, M.C., Harte, B., Harris, J.W.Evidence for a deep origin for Sao Luiz diamondsProceedings of Fifth International Kimberlite Conference held Araxa June 1991, Servico Geologico do Brasil (CPRM) Special, pp. 456-458BrazilMato Grosso, Diamond inclusions, Microprobe
DS1991-1857
1991
Harte, B.Wilding, M.C., Harte, B., Harris, J.W.Inclusion chemistry, carbon isotopes and nitrogen distribution in Bultfontein diamondsProceedings of Fifth International Kimberlite Conference held Araxa June 1991, Servico Geologico do Brasil (CPRM) Special, p. 459South AfricaDiamond inclusions, Geochronology
DS1992-0676
1992
Harte, B.Harte, B.Trace element characteristics of deep seated eclogite parageneses - an ion microprobe study of inclusions in diamondsV.m. Goldschmidt Conference Program And Abstracts, Held May 8-10th. Reston, p. A 48. abstractBrazilGeochronology, Sao Luiz alluvials
DS1992-0677
1992
Harte, B.Harte, B., Otter, M., McKeegan, K.Carbon isotope measurements on diamondsChemical Geology, Vol. 101, No. 1-2, June 10, pp. 177-183South AfricaGeochronology, Carbon isotope, diamond morphology
DS1992-0727
1992
Harte, B.Hops, J.J., Gurney, J.J., Harte, B.The Jagersfontein chromium-poor megacryst suite -towards a model for megacrystpetrogenesisJournal of Volcanology and Geothermal Research, Vol. 50, pp. 143-160South AfricaPetrogenesis, Deposit -Jagersfontein
DS1992-0866
1992
Harte, B.Kirkley, M.B., Gurney, J.J., Harte, B.rare earth elements (REE) characteristics of garnets and clinopyroxenes in eclogite xenoliths from the Roberts Victor kimberliteV.m. Goldschmidt Conference Program And Abstracts, Held May 8-10th. Reston, p. A 60. abstractSouth AfricaGeochronology, Roberts Victor
DS1992-1013
1992
Harte, B.Matthews, M., Harte, B., Prior, D.Mantle garnets - a cracking yarnGeochimica et Cosmochimica Acta, Vol. 56, No. 7, July pp. 2633-2642Lesotho, Southern AfricaMantle geochemistry, Garnets
DS1993-0635
1993
Harte, B.Harte, B.Clinopyroxene/garnet distribution coefficient for trace elements in ultramafic assemblagesGeological Society of America Annual Abstract Volume, Vol. 25, No. 6, p. A450 abstract onlySouth AfricaEclogite, Deposit -Roberts Victor
DS1993-0636
1993
Harte, B.Harte, B., Hunter, R.H., Kinny, P.D.Melt geometry, movement and crystallization, in relation to mantle veins and MetasomatismRoyal Society Transactions, Physical Sciences, Ser. A, Vol. 342, No. 1663, January 15, pp. 1-21MantleXenoliths, Geochemistry, trace elements
DS1994-0288
1994
Harte, B.Chazot, G., Menzies, M.A., Harte, B., Matteym D.Carbonatite metasomatism and melting of the Arabian lithosphere: evidence from trace element composition.Mineralogical Magazine, Vol. 58A, pp. 167-168. AbstractGlobalCarbonatite, Lherzolites
DS1994-0729
1994
Harte, B.Harte, B., Harris, J.W.Lower mantle mineral associations preserved in diamondsMineralogical Magazine, Vol. 58A, pp. 384-385. AbstractBrazilMineral associations, Mantle -lower and upper
DS1994-0730
1994
Harte, B.Harte, B., Hutchison, M.T., Harris, J.W.Trace element characteristics of the lwoer mantle: ion probe inclusions Of diamonds from Sao Luiz, Brasil.Mineralogical Magazine, Vol. 58A, pp. 386-387. AbstractBrazilGeochronology, alluvials, Deposit -Sao Luiz
DS1994-0731
1994
Harte, B.Harte, B., Hutchison, M.T., Harris, J.W.Trace element characteristics of the lower mantle: an ion probe study of inclusions in diamonds from San LuizMineralogical Magazine, Vol. 58A, pp. 386-387. AbstractBrazilGeochronology, Diamond morphology
DS1994-0732
1994
Harte, B.Harte, B., Kirkley, M.B.Clinopyroxene garnet partition coefficients for rare earth elements (REE),Strontium and Yttrium relationship to major-minor element compositionMineralogical Magazine, Vol. 58A, pp. 388-389. AbstractSouth AfricaGeochronology, Deposit -Roberts Victor
DS1994-1890
1994
Harte, B.Watt, G.R., Harris, J.W., Harte, B., Boyd, S.R.A high chromium corundum ruby inclusion in diamond from the Sao Luizalluvial mine, Brasil.Mineralogical Magazine, Vol. 58, No. 392, Sept. 490-493.BrazilDiamond inclusion
DS1994-1915
1994
Harte, B.Wilding, M.C., Harte, B., Fallick, A.E., Harris, J.W.Inclusion chemistry, carbon isotopes and nitrogen distribution in Diamonds from the Bultfontein mine.Proceedings of Fifth International Kimberlite Conference, Vol. 2, pp. 116-126.South AfricaMineral chemistry, Deposit -Bultfontein
DS1995-0237
1995
Harte, B.Burgess, S.R., Graham, C.M., Valley, J.W., Harte, B.Oxygen isotope composition of metasomatised mantle peridotite xenoliths -laser fluorination/microprobeProceedings of the Sixth International Kimberlite Conference Extended Abstracts, p. 83-85.South AfricaGeochronology, Deposit -Jagersfontein
DS1995-0238
1995
Harte, B.Burgess, S.R., Harte, B., Hops, J.J.Irregular compositional zoning in garnets from metasomatised high temp.peridotites JagersfonteinProceedings of the Sixth International Kimberlite Conference Extended Abstracts, p. 86-88.South AfricaPetrography -garnets, Deposit -Jagersfontein
DS1995-0833
1995
Harte, B.Hutchinson, M.T., Harte, B., Moore, R.O., Gurney, J.A rare earth elements (REE) study of megacrysts from the Monastery diatremeTerra Nova, Abstract Vol., p. 334.South AfricaGeochronology, Deposit -Monastery
DS1995-0834
1995
Harte, B.Hutchison, M.T., Harte, B., Harris, J.W., Fitzsimmons, I.Inferences on the exhumation history of lower mantle inclusions indiamonds.Proceedings of the Sixth International Kimberlite Conference Abstracts, pp. 242-244.BrazilGeochronology, Diamond inclusions, Sao Luiz
DS1996-0327
1996
Harte, B.Daniels, L.R.M., Gurney, J.J., Harte, B.A crustal mineral in a mantle diamondNature, Vol. 379, No. 6561, Jan. 11, p. 153-GlobalDiamond Morphology, Deposit -
DS1997-0479
1997
Harte, B.Harris, J., Hutchison, M.T., Harte, B.A new tetragonal silicate mineral occurring as inclusions in lower mantlediamonds.Nature, Vol. 387, No. 6632, May 29, pp. 486-488.MantleDiamond inclusions - silicate
DS1997-0483
1997
Harte, B.Harte, B., Kirkley, M.B.Partioning of trace elements between clinopyroxne and garnet dat a from mantle eclogites.Chemical Geology, Vol. 136, No. 1/2, March 27, pp. 1-24.GlobalGeochemistry, Eclogites
DS1997-0873
1997
Harte, B.Olive, V., Ellam, R.M., Harte, B.A Re Os isotope study of ultramafic xenoliths from the Matsoku kimberliteEarth and Planetary Science Letters, Vol. 150, No. 1-2, July pp. 129-140.GlobalGeochronology, Deposit - Matsoku
DS1998-0189
1998
Harte, B.Burgess, S.R., Harte, B.Tracing lithosphere evolution through the analysis of heterogeneous G9 G10garnets in peridotite xenoliths.7th International Kimberlite Conference Abstract, pp. 122-126South AfricaGeochemistry - garnet composition, Deposit - Jagersfontein
DS1998-0249
1998
Harte, B.Chinn, I.L., Gurney, J.J., Harte, B., FitzimmonsNitrogen contents of diamond plates: a comparison of FTIR and SIMSanalysis.7th International Kimberlite Conference Abstract, pp. 152-4.ColoradoDiamond morphology - nitrogen, Deposit - George Creek
DS1998-0591
1998
Harte, B.Harte, B., Harris, J.W. , Hutchison, Watt, WildingMineral facies and source materials for lower mantle inclusions in Diamonds from Sao Luiz, Brasil.Mineralogical Magazine, Goldschmidt abstract, Vol. 62A, p. 575-6.BrazilMineralogy - diamond inclusions, Deposit - Aripuena, Sao Luiz
DS1998-0592
1998
Harte, B.Harte, B., Hutchison, M.T., Lee, M., Harris, J.W.Inclusions of (Mg, Fe) O in mantle diamonds7th International Kimberlite Conference Abstract, pp. 308-10.South Africa, Australia, Zimbabwe, Brazil, LesothoTrace elements, mineralogy, Deposit - Sao Luiz, magnesium, iron
DS1998-0750
1998
Harte, B.Kinny, P.D., Trautman, R.L., Griffin, B.J., Harte, B.Carbon isotopic analyses of microdiamonds7th International Kimberlite Conference Abstract, pp. 423-5.Australia, Russia, South AfricaMicrodiamonds, Analytical methodology, cathodluminesce, spectroscopy
DS1998-0994
1998
Harte, B.Menzies, A.H., Gurney, J.J., Harte, B., Hauri, E.rare earth elements (REE) patterns in diamond bearing eclogites and diamond bearing peridotites from Newlands kimberlite.7th International Kimberlite Conference Abstract, pp. 573-5.South AfricaEclogites, peridotites, Deposit - Newlands
DS1998-1285
1998
Harte, B.Sautter, V., Harte, B., Harris, J.W.Majorite destabilisation on decompression: constrains from natural sample son plume velocity.Mineralogical Magazine, Goldschmidt abstract, Vol. 62A, p. 1320-1.BrazilMajorites, Deposit - Sao Luiz
DS2000-0855
2000
Harte, B.Sassi, R., Harte, B., Carswell, D.A., Yujing, H.Trace element distribution in Central Dabie eclogitesContributions to Mineralogy and Petrology, Vol. 139, No. 3, pp. 298-315.China, east central ChinaEclogites, petrology, Dabie Shan, Deposit - Dabie Shan
DS2002-0660
2002
Harte, B.Harte, B., Harris, J.W., Wilding, M., Sautter, V., McCammon, C.Eclogite garnetite inclusions in diamonds from the Sao Luiz area, Brasil18th. International Mineralogical Association Sept. 1-6, Edinburgh, abstract p.74.BrazilGarnet mineralogy
DS2003-1237
2003
Harte, B.Schulze, D.J., Harte, B., Valley, J.W., Brenan, J.M., DeR. Channer, D.M.Extreme crustal oxygen isotope signatures preserved in coesite diamondNature, No. 6935, May 1, p. 68-69.GlobalGeochronology
DS2003-1272
2003
Harte, B.Shulze, D.J., Harte, B., Valley, J.W., Channer, D.M. DeR.Extreme geochemical variation during and following diamond growth, Guaniamo8 Ikc Www.venuewest.com/8ikc/program.htm, Session 2, AbstractVenezuelaEclogites, diamonds, Geochemistry
DS200412-0246
2004
Harte, B.Burgess, S.R., Harte, B.Tracing lithospheric evolution through the analysis of heterogeneous G9 G10 garnets in peridotite xenoliths II. REE chemistry.Journal of Petrology, Vol. 45, 3, pp. 609-633.MantleGeochemistry, Deposit - Jagersfontein, metasomatic melt
DS200412-1767
2003
Harte, B.Schulze, D.J., Harte, B., Valley, J.W., Brenan, J.M., DeR Channer, D.M.Extreme crustal oxygen isotope signatures preserved in coesite diamond.Nature, No. 6935, May 1, p. 68-69.TechnologyGeochronology
DS200412-1768
2004
Harte, B.Schulze, D.J., Harte, B., Valley, J.W., Channer, D.M.De R.Evidence of subduction and crust mantle mixing from a single diamond.Lithos, Vol. 77, 1-4, Sept. pp. 349-358.South America, Venezuela, GuaniamoGarnet, carbon oxygen isotopes, geochonology
DS200412-1814
2003
Harte, B.Shulze, D.J., Harte, B., Valley, J.W., Channer, D.M.DeR.Extreme geochemical variation during and following diamond growth, Guaniamo, Venezuela.8 IKC Program, Session 2, AbstractSouth America, VenezuelaEclogite, diamonds Geochemistry
DS200412-2198
2004
Harte, B.Zedgenizov, D.A., Harte, B.Microscale variations of d13C and N content within a natural diamond with mixed habit growth.Chemical Geology, Vol. 205, 1-2, pp. 169-175.TechnologyDiamond morphology
DS200512-0950
2005
Harte, B.Schulze, D.J., Harte, B., Channer, D.M.DrR., Spicuzza, M.J., Viljoen, K.S.Stable isotope evidence for a subduction origin for mantle eclogites and their diamonds.GAC Annual Meeting Halifax May 15-19, Abstract 1p.United States, ColoradoGeochronology, diamond genesis
DS200612-0544
2006
Harte, B.Harte, B., Cayzer, N.An EBSD study of majoritic garnet inclusions in diamonds. Sao Luiz River.International Mineralogical Association 19th. General Meeting, held Kobe, Japan July 23-28 2006, Abstract p. 139.South America, BrazilDiamond inclusions
DS200612-0627
2006
Harte, B.Ivanic, T., Harte, B., Gurney, J.Multiple events affecting highly chromian, garnet rich peridotite xenoliths from South Africam kimberlites. Newlands, Bobbejaan.International Mineralogical Association 19th. General Meeting, held Kobe, Japan July 23-28 2006, Abstract p. 137.Africa, South AfricaGeothermometry
DS200612-1156
2006
Harte, B.Reutskiy, V.N., Harte, B., Borzdov, Yu.M., Palyanov, Yu.N.Carbon and nitrogen effects during HTHP diamond crystallization.International Mineralogical Association 19th. General Meeting, held Kobe, Japan July 23-28 2006, Abstract p. 139.TechnologyDiamond morphology
DS200612-1246
2006
Harte, B.Schultz, D.J., Harte, B., Valley, J.W., Channer, D.M.DeR.Diamonds with multiple growth stages and variable fluid sources from the Quebrada Grande region of Guaniamo, Venezuela.International Mineralogical Association 19th. General Meeting, held Kobe, Japan July 23-28 2006, Abstract p. 137.South America, VenezuelaDiamond morphology
DS200612-1585
2006
Harte, B.Zegrenizov, D.A., Harte, B., Shatsky, V.S., Politov, A.A., Rylov, G.M., Sobolev, N.V.Directional chemical variations in diamonds showing octahedral following cuboid growth.Contributions to Mineralogy and Petrology, Vol. 151, 1, Jan. pp. 45-57.Russia, YakutiaMineral chemistry, subduction
DS200712-0158
2007
Harte, B.Cayzer, N.J., Odake, S., Harte, B., Kagi, H.Plastic deformation of lower mantle diamonds by inclusion phases transformations.Frontiers in Mineral Sciences 2007, Joint Meeting of Mineralogical societies Held June 26-28, Cambridge, Abstract Volume p.188-189.MantleDiamond morphology
DS200712-0159
2007
Harte, B.Cayzer, N.J., Odake, S., Harte, B., Kagi, H.Plastic deformation of lower mantle diamonds by inclusion phases transformations.Frontiers in Mineral Sciences 2007, Joint Meeting of Mineralogical societies Held June 26-28, Cambridge, Abstract Volume p.188-189.MantleDiamond morphology
DS200712-0416
2007
Harte, B.Harte, B., Cayzer, N.Decompression and unmixing of crystals included in diamonds from the mantle transition zone.Physics and Chemistry of Minerals, Vol. 34, 9, pp. 647-656.South America, BrazilMineralogy
DS200712-0455
2007
Harte, B.Hudson, N.F.C., Harte, B.A pretrogenetic grid for mineral reactions in rocks at depths near the upper/lower mantle boundary.Frontiers in Mineral Sciences 2007, Joint Meeting of Mineralogical societies Held June 26-28, Cambridge, Abstract Volume p.187.MantleUP phases
DS200712-0456
2007
Harte, B.Hudson, N.F.C., Harte, B.A petrogenetic grid for mineral reactions in rocks at depths near the upper/lower mantle boundary.Frontiers in Mineral Sciences 2007, Joint Meeting of Mineralogical societies Held June 26-28, Cambridge, Abstract Volume p.187.MantleUP phases
DS200712-0959
2007
Harte, B.Schulze, D.J., Coopersmith, H.G., Harte, B., Pizzolato, L-A.Mineral inclusions in diamonds from the Kelsey Lake mine, Colorado, USA: depleted Archean Mantle beneath the Proterozoic Yavapai Province.Geochimica et Cosmochimica Acta, Vol. 72, 6, pp. 1685-1695.United States, Colorado PlateauDeposit - Kelsey Lake
DS200712-0960
2007
Harte, B.Schulze, D.J., Page, F.Z., Valley, J.W., Harte, B., Kita, N., Channer, D.M.,Jaques, L.Quasi-correlation between carbon and oxygen isotope signatures in eclogitic diamonds and their mineral inclusions.Geological Association of Canada, Gac-Mac Yellowknife 2007, May 23-25, Volume 32, 1 pg. abstract p.73-74.South America, Venezuela, Australia, Africa, BotswanaGeochronology
DS200812-0189
2008
Harte, B.Cayzer, N.J., Odake, S., Harte, B., Kagi, H.Plastic deformation of lower mantle diamonds by inclusion phase transformation.European Journal of Mineralogy, Vol. 20, no. 3, 333-339.MantleDiamond inclusions
DS200812-0581
2008
Harte, B.Klemme, S., Ivanic, T.J., Connolly, J.A.D., Harte, B.Thermodynamic modelling of Cr bearing garnets in diamond bearing peridotites.Goldschmidt Conference 2008, Abstract p.A481.Africa, South AfricaMineral chemistry
DS200812-0952
2008
Harte, B.Reutsky, V.N., Harte, B., EIMF, Borzdov, Y.M., Palyanov, Y.N.Monitoring diamond crystal growth, a combined experimental and SIMS study.European Journal of Mineralogy, Vol. 20, no. 3, pp. 365-374.TechnologyDiamond morphology
DS200912-0133
2009
Harte, B.Craven, J.A., Harte, B., Fisher, D., Shultze, D.J.Diffusion in diamond. 1. carbon isotope mapping of natural diamond.Mineralogical Magazine, Vol.73, 2, April, pp. 193-200.TechnologyDiamond morphology
DS200912-0284
2009
Harte, B.Harte, B., Taniguchi, T., Chakraborty, S.Diffusion in diamond. II. High pressure temperature experiments.Mineralogical Magazine, Vol.73, 2, April, pp. 201-204.TechnologyUHP
DS200912-0389
2009
Harte, B.Klemme, S., Ivanic, T.J., Connolly, J.A.D., Harte, B.Thermodynamic modelling of Cr bearing garnets with implications for diamond inclusions and peridotite xenoliths.Lithos, In press availableTechnologyDiamond inclusions
DS200912-0544
2009
Harte, B.Odake, S., Fukura, S., Arakawa, S., Ohta, M., Harte, B., Kagi, H.Divalent chromium in ferropericlase inclusions in lower mantle diamonds revealed by morco XANES measurements.Journal of Mineralogical and Petrological Sciences, Vol. 103, 5, pp. 350-353.TechnologyDiamond inclusions
DS200912-0545
2009
Harte, B.Odake, S., Kagi, H., Arakawa, M., Ohta, A., Harte, B.Oxidation state of chromium in ferropericlese inclusions in lower mantle diamonds determined with micro-XANES measurements.Goldschmidt Conference 2009, p. A962 Abstract.MantleDiamond inclusions
DS201012-0269
2010
Harte, B.Harte, B.Diamond formation in the deep mantle: the record of mineral inclusions and their distribution in relation to mantle dehydration zones.Mineralogical Magazine, Vol. 74, 2, pp. 189-215.MantleDiamond genesis
DS201012-0853
2010
Harte, B.Wirth, R., Dobrzhinetskaya, L., Harte, B., Green, H.W.Tubular Mg ferrite in magnesiowustite inclusions in diamond from superdeep origin: control of Fe valence by dislocation core structure.International Mineralogical Association meeting August Budapest, abstract p. 210.South America, BrazilPetrology
DS201201-0846
2012
Harte, B.Harte, B., Richardson, S.Mineral inclusions in diamonds track the evolution of a Mesozoic subducted slab beneath West Gondwanaland.Gondwana Research, Vol. 21, 1, pp. 236-245.Mantle, Gondwana, South America, BrazilMicrodiamonds
DS201212-0285
2012
Harte, B.Harte, B.Mineral associations in diamonds from the lowermost upper mantle.10th. International Kimberlite Conference Feb. 6-11, Bangalore India, AbstractMantleDiamond - mineralogy
DS201212-0286
2012
Harte, B.Harte, B., Richardson, S.Diamonds from Juina, Brazil, track the evolution of a subducted mantle.10th. International Kimberlite Conference Held Bangalore India Feb. 6-11, Poster abstractSouth America, BrazilDeposit - Juina
DS201212-0334
2012
Harte, B.Ivanic, T.J., Harte, B., Gurney, J.J.Metamorphic re-equilibrium and metasomatism of highly chromian, garnet-rich peridotitic xenoliths from South Africa kimberlites.Contributions to Mineralogy and Petrology, in press available 16p.Africa, South AfricaDeposit - Newlands, Bobbejaan
DS201312-0364
2013
Harte, B.Harte, B.Subducted carbon in stagnate slabs: evidence from deep diamonds.Goldschmidt 2013, AbstractSouth America, BrazilJuina area
DS201312-0365
2013
Harte, B.Harte, B.Melt injections and metasomatism in the continental mantle lithosphere beneath southern Africa.Goldschmidt 2013, AbstractAfrica, South Africa, LesothoKimberley area, Matsoku
DS201312-0366
2013
Harte, B.Harte, B., Hudson, N.F.C.Mineral associations in diamonds from the lowermost upper mantle and uppermost lower mantle.Proceedings of the 10th. International Kimberlite Conference, Vol. 1, Special Issue of the Journal of the Geological Society of India,, Vol. 1, pp. 235-254.MantleMineralogy
DS201312-0399
2013
Harte, B.Holland, T.J.B., Hudson, N.F.C., Powell, R., Harte, B.How irreversible heat transport processes drive Earth's interdependent thermal, structural and chemical evolution.Journal of Petrology, Vol. 54, pp. 1901-1920.MantleGeothermometry
DS201312-0794
2013
Harte, B.Schulze, D., Harte, B., Page, F.Z., Valley, J.W., DeR Channer, D.M., Jaques, A.L.Anticorrelation between low d13c of eclogitic diamonds and high d180 of their coesite and garnet inclusions requires a subduction origin.Geology, Vol. No. 4, pp. 455-458.South America, Venezuela, Australia, Africa, BotswanaDeposit - Guaniamo, Arygle, Orapa
DS201412-0342
1999
Harte, B.Harte, B., et al.Lower mantle mineral associations in diamonds from Sao Luiz Brazil.Geochemical Society Special Publication No. 6, Mantle Petrology, No. 6, pp.South America, BrazilDeposit - Brauna
DS201412-0343
2014
Harte, B.Harte, B., Dawson, J.B., Gurney, J.J.Field counts of mantle xenoliths from the Kaapvaal Craton: with memories of Barry Dawson.Volcanic and Magmatic Studies Group meeting, Abstract only Held Jan. 6-8. See minsoc websiteAfrica, South AfricaXenoliths
DS201412-0985
2014
Harte, B.Wirth, R., Dobrzhinetskaya, L., Harte, B., Schreiber, A., Green, H.W.High-Fe (Mg,Fe)O inclusion in diamond apparently from the lowermost mantle.Earth and Planetary Science Letters, Vol. 404, Oct. pp. 365-375.MantleDiamond inclusions
DS201603-0387
2016
Harte, B.Ivanic, T.J., Harte, B., Gurney, J.J.A discussion of "Mineralogical controls on garnet composition in the cratonic mantle" by Hill et al. 2015Contributions to Mineralogy and Petrology, Vol. 171, 4p.MantleMineralogy
DS201708-1665
2017
Harte, B.Harte, B.Tracing lithsophere melt compositions using polymict peridotites11th. International Kimberlite Conference, PosterMantlemelting
DS201708-1666
2017
Harte, B.Harte, B.The petrology of the Kaapvaal craton mantle lithosphere - a synposis based on xenolith field counts.11th. International Kimberlite Conference, PosterAfrica, South Africa, mantleXenoliths
DS202108-1287
2021
Harte, B.Harte, B., Helmstaedt, H., Kopylova, M., Moore, A.E.John Gurney - a career of discovery and promotion of scientific knowledge.Lithos, Vol. 398-399, 1p. Africa, South Africa, GlobalTribute, obituary
DS1991-0876
1991
Harte, J.J.Kirkley, M.B., Gurney, J.J., Harte, J.J., Helmstaedt, H.Geochemical correlations in Roberts Victor eclogitesProceedings of Fifth International Kimberlite Conference held Araxa June 1991, Servico Geologico do Brasil (CPRM) Special, p. 224South AfricaGeochemistry, Eclogite xenoliths
DS2003-0625
2003
Hartem B.Ivanic, T.J., Hartem B., Burgess, S.R., Gurney, J.J.Factors in the formation of sinuous and humped Ree patterns in garnets from mantle8ikc, Www.venuewest.com/8ikc/program.htm, Session 4, POSTER abstractMantleMantle geochemistry
DS1859-0126
1858
Harting, P.Harting, P.Description of a Remarkable DiamondAmsterdam: C.G. Van Der Post., 15P.BrazilDiamond notable
DS1999-0026
1999
HartlaubAshton, K.E., Heaman, L.M., Lewry, HartlaubAge and origin of the Jan Lake Complex: a glimpse at the buried Archean craton of the Trans Hudson Orogen.Canadian Journal of Earth Sciences, Vol. 36, No. 2, Feb. pp. 185-208.Manitoba, SaskatchewanLithoprobe, Geophysics - seismics
DS200412-1515
2003
HartlaubPehrsson, S.J., Peterson, T., Davis, W.J., Sandeman, Skulski, Van Breenen, Hartlaub, Wodicks, Hanmer, CousensAncient Archean crust in the Western Churchill Province: a review of direct and indirect evidence.31st Yellowknife Geoscience Forum, p. 75. (abst.)Canada, Saskatchewan, Manitoba, NunavutTectonics - lithosphere
DS200412-1516
2003
HartlaubPehrsson, S.J., Peterson, T., Davis, W.J., Sandeman, Skulski, Van Breenen, Hartlaub, Wodicks, Hanmer, CousensThe Western Churchill metallogeny project: from Melville to Uranium City, a new look at the largest under explored Craton in the31st Yellowknife Geoscience Forum, p. 77. (abst.)Canada, Saskatchewan, Manitoba, Northwest Territories, NunavutBedrock compilation
DS200512-0402
2005
Hartlaub, R.Harper, C.T., Van Breeman, O., Wodick,N., Pehrsson, S., Heaman, L., Hartlaub, R.The Paleoproterozoic lithostructural history and thermotectonic reactivation of the Archean basement in southern Hearne domain of northeastern Saskatchewan.GAC Annual Meeting Halifax May 15-19, Abstract 1p.Canada, SaskatchewanTrans Hudson orogen
DS2000-0039
2000
Hartlaub, R.P.Ashton, K.E., Hartlaub, R.P., Card, C.D.The northeastern Rae Province in SaskatchewanGeological Association of Canada (GAC)/Mineralogical Association of Canada (MAC) 2000 Conference, 4p. abstractSaskatchewanTectonics, lithostratigraphy, Craton
DS2002-0072
2002
Hartlaub, R.P.Ashton, K.E., Hartlaub, R.P., Heaman, L.M.,Card, C.D.Neoarchean history of the Rae province in northern Saskatchewan: insights into Archean tectonism.Gac/mac Annual Meeting, Saskatoon, Abstract Volume, P.4., p.4.SaskatchewanTectonics
DS2002-0073
2002
Hartlaub, R.P.Ashton, K.E., Hartlaub, R.P., Heaman, L.M.,Card, C.D.Neoarchean history of the Rae province in northern Saskatchewan: insights into Archean tectonism.Gac/mac Annual Meeting, Saskatoon, Abstract Volume, P.4., p.4.SaskatchewanTectonics
DS2002-0074
2002
Hartlaub, R.P.Ashton, K.E., Hartlaub, R.P., Heaman, L.M.,MoreilliPaleoproterozoic history of the Rae Province in northern saskatchewan: the The lon Taitson Trans HudsonGac/mac Annual Meeting, Saskatoon, Abstract Volume, P.4., p.4.SaskatchewanTectonics
DS2002-0075
2002
Hartlaub, R.P.Ashton, K.E., Hartlaub, R.P., Heaman, L.M.,MoreilliPaleoproterozoic history of the Rae Province in northern saskatchewan: the The lon Taitson Trans HudsonGac/mac Annual Meeting, Saskatoon, Abstract Volume, P.4., p.4.SaskatchewanTectonics
DS2002-0661
2002
Hartlaub, R.P.Hartlaub, R.P.,Heaman, L.M., Ashton, Chacko, CreaserWas there an - 2000 km long Neoarchean extensional event in the Rae Craton? Evidence from the Murmac Bay..Gac/mac Annual Meeting, Saskatoon, Abstract Volume, P.46., p.46.SaskatchewanGeochronology
DS2002-0662
2002
Hartlaub, R.P.Hartlaub, R.P.,Heaman, L.M., Ashton, Chacko, CreaserWas there an - 2000 km long Neoarchean extensional event in the Rae Craton? Evidence from the Murmac Bay..Gac/mac Annual Meeting, Saskatoon, Abstract Volume, P.46., p.46.SaskatchewanGeochronology
DS2002-0663
2002
Hartlaub, R.P.Hartlaub, R.P.,Heaman, L.M., Ashton, Chacko, CreaserExtent of Rae Craton basement: evidence of an ancient >3.7 Ga component from U Pb Nd isotope studies.Gac/mac Annual Meeting, Saskatoon, Abstract Volume, P.47., p.47.SaskatchewanGeochronology
DS2002-0664
2002
Hartlaub, R.P.Hartlaub, R.P.,Heaman, L.M., Ashton, Chacko, CreaserExtent of Rae Craton basement: evidence of an ancient >3.7 Ga component from U Pb Nd isotope studies.Gac/mac Annual Meeting, Saskatoon, Abstract Volume, P.47., p.47.SaskatchewanGeochronology
DS200612-0545
2005
Hartlaub, R.P.Hartlaub, R.P., Chacko, T., Heaman, L.M., Creaser, R.A., Ashton, K.E., Simonetti, A.Ancient (Meso-Paleoarchean) crust in the Rae Province, Canada: evidence from Sm-Nd and U-Pb constraints.Precambrian Research, Vol. 141, 3-4, Nov. 20, pp. 137-153.Canada, Saskatchewan, Alberta, Northwest TerritoriesGeochronology, crustal recycling
DS200612-0546
2006
Hartlaub, R.P.Hartlaub, R.P., Heaman, L.M., Simonetti, A., Bohm, C.O.Relicts of Earth's crust: U Pb, Lu Hf and morphological characteristics of > 3.7 Ga detrital zircon of the western Canadian Shield.Geological Society of America, Processes on the Earth, Special Paper 405, Chapter 5.CanadaGeochronology
DS201905-1018
2019
Hartlaub, R.P.Bohm, C.O., Hartlaub, R.P., Heaman, L.M., Cates, N., Guitreau, M., Bourdon, B., Roth, A.S.G., Mojzsis, S.J., Blichert-Toft, J.The Assean Lake Complex: ancient crust at the northwestern margin of the Superior Craton, Manitoba, Canada.Earths Oldest Rocks, researchgate.com Chapter 28, 20p. Pdf availableCanada, Manitobacraton

Abstract: This chapter describes the Assean Lake Complex (ALC) at ancient crust at the Northwestern margin of the Superior Craton, Manitoba, and Canada. An initial tectonic model for the Assean Lake area indicated that a regionally extensive high-strain zone running through the lake marks the suture between Archean high-grade crustal terranes of the Superior Craton to the southeast and Paleoproterozoic rocks of the Trans-Hudson Orogen to the northwest. Detailed geologic remapping combined with isotopic and geochemical studies led to a re-interpretation of the crust immediately north of the Assean Lake high-strain zone as Mesoarchean. The study area straddles the boundary between the Archean Superior Craton and the ca.1.90-1.84 Ga arc and marginal basin rocks of the Trans-Hudson Orogen, which represent the remains of ca. 1.83-1.76 Ga ocean closure and orogeny. It is indicated that the gneisses of the Split Lake Block consist primarily of meta-igneous protoliths of gabbroic to granitic composition. Tonalite and granodiorite are the most volumetrically dominant, but an anorthosite dome is also present in the northeast. Mapping, isotopic, and age data combined with high-resolution aero-magnetic data indicate that the Mesoarchean ALC is a crustal slice up to 10 km wide, and has a strike length of at least 50 km.
DS202002-0167
2019
Hartlaub, R.P.Bohm, C.O., Hartlaub, R.P., Heaman, L.M., Cates, N., Guitreau, M., Bourdon, B., Roth, A.S.G., Mojzsis, S.J., Blichert-Toft, J.The Assean Lake Complex: ancient crust at the northwestern margin of the Superior craton, Manitoba, Canada. ( not specific to diamonds)Earth's Oldest Rocks, Chapter 28, 20p. Pdf.Canada, Manitobacraton
DS1860-0725
1892
Hartley, C.H.Hartley, C.H.London and Orange Free State Exploration Co. Ltd.Kimberley: C.H. Hartley, 19P.Africa, South AfricaProspecting, Company
DS1994-0733
1994
Hartley, J.S.Hartley, J.S.Drilling : tools and program managementBalkema, 150p. approx, $40.00GlobalBook -ad and review, Drilling
DS1986-0559
1986
Hartley, P.Meen, J.K., Hartley, P.Control of potash contents of arc volcanics by pressure of fractionation of parental basalts- experimental evidenceGeological Society of America (GSA) Abstract Volume, Vol. 18, No. 6, p. 692. (abstract.)MontanaAbsaroka, shoshonites
DS1990-0669
1990
Hartley, R.Hartley, R., Watts, A.B.Preliminary analysis of gravity and topography over AfricaEos, Vol. 71, No. 43, October 23, p. 1605 AbstractAfricaGeophysics -gravity
DS1996-0608
1996
Hartley, R.Hartley, R., Watts, A.B., Fairhead, J.D.Isostasy of AfricaEarth and Planetary Science Letters, Vol. 137, No. 1-4, Jan. 1, pp. 1-18AfricaGeomorphology, Isostasy
DS1996-0609
1996
Hartley, R.Hartley, R., Watts, A.B., Fairhead, J.D.Isostasy of AfricaEarth and Planetary Science Letters, Vol. 137, No. 1/4, Jan. 1, pp. 1-18.AfricaIsostasy, Lithosphere
DS201112-0415
2011
Hartley, R.A.Hartley, R.A., Roberts, G.G., White, N., Ricgardson, C.Transient convective uplift of an ancient buried landscale.Nature Geoscience, in press availableMantle, Europe, ScotlandConvection
DS1994-0734
1994
Hartley, R.W.Hartley, R.W., Allen, P.A.Interior cratonic basins of Africa: relation to continental break up and role of mantle convection.Basin Research, Vol. 6, No. 2, 3, June/Sept. pp. 95-114.AfricaCraton, Tectonics
DS1982-0255
1982
Hartley, W.K.Hartley, W.K.Diamond Mining Methods at Kimberley Over the Past Thirty Years.Paper Presented At The Commonwealth Min. Met. Symposium Held, WORLD MINING, JULY 1982, P. 33. (abstract.).South AfricaKimberlite, Kimberley, Mine, Mining, History
DS1970-0455
1971
Hartman, F.H.Wyman, R.A., Hartman, F.H.Examination of a Bulk Sample of Kimberlite for Diamond Content.Canmet Ir 71-83, 16P.Canada, OntarioMineralogy, X-ray
DS1994-1894
1994
Hartman, G.Wedepohl, K.H., Hartman, G.The composition of the primitive upper earth's mantleProceedings of Fifth International Kimberlite Conference, Vol. 1, pp. 486-495.MantleGeochemistry
DS1992-0678
1992
Hartman, H.L.Hartman, H.L.Society for Mining, Metallurgy and Exploration (SME) Mining Engineering Handbook, 2nd. editionAmerican Institute of Mining, Metallurgical, and Petroleum Engineers (AIME)., 2 volumes 2000p. approx. $ 100.00 United StatesGlobalMining Engineering Handbook, Book -ad
DS1989-0596
1989
Hartman, K.Hartman, K.An integrated approach to marketing (multi products/multi- markets)American Institute of Mining, Metallurgical, and Petroleum Engineers (AIME) Preprint held Las Vegas Feb. 27-March 2, 1989, No. 89-113 3p. Database # 17680GlobalEconomics, Industrial minerals
DS1998-0856
1998
Hartman, L.A.Leite, J.A.D., Hartman, L.A., Chemale, F.Shrimp uranium-lead (U-Pb) zircon geochronology of Neoproterozoic juvenile and crustal reworked terranes in southernmostInternational Geology Review, Vol. 40, No. 8, Aug. 1, pp. 688-721BrazilGeochronology, Tectonics
DS1910-0056
1910
Hartmann, G.Hartmann, G.Versuch Einer Allgeme inverstand lichen Beschreibung des Orographischen und Geologischen Aufbaus von Deutsch Suedwestafrika.Deutsch. Kolon. Essen., BD. 3, PP. 204-224.Southwest Africa, NamibiaGeography, Geology, Diamond
DS201112-0373
2011
Hartmann, J.Gleeson, T., Smith, L., Moosdorf, N., Hartmann, J., Durr, H.H., manning, A.H., Van Beek, P.H., Jellinek, A.Mapping permeability over the surface of the Earth.Geophysical Research Letters, Vol. 38, L02401MantleGeophysics
DS201905-1040
2019
Hartmann, J.Hartmann, J. Plate tectonics, carbon, and climate.Science, Vol. 364, 6436, pp. 126-127.Mantleplate tectonics

Abstract: Over the past 541 million years (the Phanerozoic eon), Earth's climate has been relatively stable compared to preceding eons. However, there have been periods of longer glaciations, which have been attributed to changes in the balance between CO2 sources and sinks. The major CO2 sources are thought to be mantle degassing at hotspot volcanoes, mid-ocean ridges, and rifts; subduction zone volcanoes; metamorphosis of carbonate rocks into silicate rocks; and oxidative weathering (see the figure) (1). The main CO2 sink is chemical weathering and the subsequent transfer of carbon to the ocean, where carbonate sediments lock up CO2 for long periods of time. During arc-continent collisions, rocks from volcanic arcs are accreted to continents. On page 181 of this issue, Macdonald et al. (2) propose that weathering can rise after the accreted rocks are exposed at Earth's surface. This mechanism may explain the glaciations seen during the Phanerozoic.
DS1975-0100
1975
Hartmann, K.Hartmann, K., Binnewies, B.Gemstones; 1975Stuttgart: Kosmos Gesellschaft Der Naturfreunde Frankh'sche, 71P.GlobalDiamond, Kimberley
DS1989-1351
1989
Hartmann, L.A.Schiebe, L.F., Formoso, M.L.L., Nardi, L.V.S., Hartmann, L.A.Geochemistry of rare earth elements of alkalic rocks,carbonatites and kimberlite rocks; study of Brazilianoccurrence.(in Portugese).In: Geochemistry of rare earth elements in Brasil, Co. Pesqui Rec. Miner., pp. 37-46BrazilAlkaline rocks, Kimberlites -geochemistry
DS1994-1717
1994
Hartmann, L.A.Suita, M.T.F., Hartmann, L.A.The nature of high grade Barro Alto layered mafic-ultramafic complex and adiscussion in Goias.International Symposium Upper Mantle, Aug. 14-19, 1994, Extended abstracts pp. 82-84.BrazilMafic -Ultramafic Complex, Braziliano Uracuanao cycles
DS1999-0297
1999
Hartmann, L.A.Hartmann, L.A., Leite, J.A.D., McNaughton, N.J., SantosDeepest exposed crust of Brasil- SHRIMP established three eventsGeology, Vol. 27, No. 10, Oct. pp. 947-50.Brazil, Rio Grande do SulGeochronology, Shield
DS2000-0392
2000
Hartmann, L.A.Hartmann, L.A., Leite, J.A.D., Da Silva, Remus et al.Advances in SHRIMP geochronology and their impact on understanding tectonic and metallogenic evolution....Australian Journal of Earth Sciences, Vol. 47, No. 5, Oct. pp. 829-44.BrazilGeochronology, Metallogeny
DS2001-0455
2001
Hartmann, L.A.Hartmann, L.A., et al.Archean crust in the Rio de la Plat a Craton - SHRIMP uranium-lead (U-Pb) zircon reconnaissance geochronology.Journal of South American Earth Sciences, Vol. 14, No. 6, Nov. pp. 557-70.UruguayGeochronology, Craton - Rio de la Plata
DS2002-0665
2002
Hartmann, L.A.Hartmann, L.A., et al.Zircon and titanite U Pb SHRIMP geochronology of Neoproterozoic felsic magmatism on the eastern border of the Rio de la Plat a Craton, Uruguay.Journal of South American Earth Sciences, Vol.15,2,June pp. 229-36.UruguayGeochronology, Magmatism
DS2003-1233
2003
Hartmann, L.A.Schneider Santos, J.O., Potter, P.E., Reis, N.J., Hartmann, L.A., Fletcher, I.R.Age, source and regional stratigraphy of the Roriama Supergroup and Roraima likeGeological Society of America Bulletin, Vol. 115, 3, pp. 331-48.Guyana Shield, Pacaraima PlateauGeochronology, Amazon Craton, zircon
DS2003-1243
2003
Hartmann, L.A.Scneider Santos, J. Orestes, Potter, P.E., Reiss, N.J., Hartmann, L.A., FletcherAge, source and regional stratigraphy of the Roraima Supergroup and Roraima likeGeological Society of America Bulletin, Vol. 115, 3, pp. 331-348.Guyana Shield, South America, BrazilAmazon Craton, baddeleyite, diamond, geochronology
DS200412-1762
2003
Hartmann, L.A.Schneider Santos, J.O., Potter, P.E., Reis, N.J., Hartmann, L.A., Fletcher, I.R., McNaughton, N.J.Age, source and regional stratigraphy of the Roriama Supergroup and Roraima like outliers in northern South America based on U PGeological Society of America Bulletin, Vol. 115, 3, pp. 331-48.South America, GuyanaGeochronology, Amazon Craton, zircon
DS200512-0406
2004
Hartmann, L.A.Hartmann, L.A., Santos, J.O.Early Paleoproterozoic 2.5-2.0 Ga tectonic evolution of South America.Geological Society of America Annual Meeting ABSTRACTS, Nov. 7-10, Paper 142-5, Vol. 36, 5, p. 339.South America, Brazil, Venezuela, Guyana, French Guiana, UruguayTectonics
DS200512-0407
2004
Hartmann, L.A.Hartmann, L.A.,Milani, E.J., Schobbenhaus, C., Dall'agnol, R., Alkmim, F.F.The stratigraphy of Brazil: a continental scale task.Geological Society of America Annual Meeting ABSTRACTS, Nov. 7-10, Paper 230-9, Vol. 36, 5, p. 532.South America, BrazilCraton, basins
DS200812-0988
2008
Hartmann, L.A.Saalmann, K., Remus, M.V.D., Hartmann, L.A.Neoproterozoic magmatic arc assembly in the southern Brazilian Shield constraints for a plate tectonic model for the Brasilliano Orogeny.Geotectonic Research, Vol. 95, suppl. 1 pp. 41-59.South America, BrazilMagmatism, Tectonics
DS201112-0895
2011
Hartmann, L.A.Saalmann, K., Gerdes, A., Lahaye, Y., Hartmann, L.A., Remus, M.V.D., Laufer, A.Multiple accretion at the eastern margin of the Rio de la Plat a craton: the prolonged Brasiliano orogeny in southernmost Brazil.International Journal of Earth Sciences, Vol. 100, 2, pp. 355-378.South America, BrazilCraton, not specific to diamonds
DS1981-0285
1981
Hartnady, C.J.H.Martin, A.K., Hartnady, C.J.H., Goodlad, S.W.Pre-drift Fit of the Natal Valley and the Falkland PlateauCape Town: Tech. Report Mar. Geosci. Unit, Geological Survey South, No. 12, PP. 30-44.South Africa, South AmericaTectonics
DS1985-0271
1985
Hartnady, C.J.H.Hartnady, C.J.H.Uplift, Faulting, Seismicity, Thermal Spring and Possible Incipient Volcanic Activity in the Lesotho-natal Region, Southeast Africa: the Quathlamba hotspot Hyopthesis.Tectonics, Vol. 4, No. 4, JUNE, PP. 371-377.LesothoGeotectonics
DS1991-0679
1991
Hartnady, C.J.H.Hartnady, C.J.H.About turn for supercontinentsNature, Vol. 352, No. 6335, August 8, pp. 476-478GlobalTectonics, Mantle, Pangea
DS1991-0680
1991
Hartnady, C.J.H.Hartnady, C.J.H.Plate tectonics: supercontinents turnedNature, Vol. 352, No. 6335, August 8, pp. 476-478GlobalTectonics, Supercontinents
DS1991-0681
1991
Hartnady, C.J.H.Hartnady, C.J.H.Seismicity and plate boundary evolution in southeastern AfricaSouth African Journal of Geology, Vol. 93, No. 3, July pp. 473-484South Africa, LesothoTectonics, East African rift
DS1992-0679
1992
Hartnady, C.J.H.Hartnady, C.J.H., Onstott, T.C.A mesoproterozoic geosuture link between North America and southernAfrica?Eos Transactions, Vol. 73, No. 14, April 7, supplement abstracts p.365United States, Canada, Southern AfricaCraton, Supercontinent
DS1995-0767
1995
Hartnady, C.J.H.Hartnady, C.J.H.Quantitative models of crustal growthSouth African Journal of Geology, Vol. 98, No. 2, June pp. 101-111South AfricaMantle -model, Crust
DS1995-0768
1995
Hartnady, C.J.H.Hartnady, C.J.H.Quantitative models of crustal growthSouth. African Journal of Geology, Vol. 98, No. 2, June pp. 109-111.South AfricaCrust, Mantle
DS1996-0473
1996
Hartnady, C.J.H.Frimmel, H.E., Hartnady, C.J.H., Koller, F.Geochemistry and tectonic setting of magmatic units in the Pan African Gariep belt, NamibiaChemical Geology, Vol. 130, No. 1-2, Aug. 7, pp. 101-138NamibiaGeochemistry, Gariep Belt
DS200412-1935
1984
Hartnady, C.J.H.Stowe, C.W., Hartnady, C.J.H., Joubert, P.Proterozoic tectonic provinces of southern Africa.Precambrian Research, Vol. 25, 1-3, pp. 229-231.Africa, South AfricaTectonics
DS201906-1325
2019
Hartnady, M.Mole, D.R., Kirkland, C.L., Fiorentinim M.L., Barnes, S.J., Cassidy, K.F., Isaac, C., Belousova, E.A., Hartnady, M., Thebaud, N.Time space evolution of an Archean craton: a Hf-isotope window into continent formation. YilgarnEarth Science Reviews, https://doi.org/10.1016/j.earscrev.2019.05.03Australiacraton

Abstract: The Yilgarn Craton of Western Australia represents one of the largest pieces of Precambrian crust on Earth, and a key repository of information on the Meso-Neoarchean period. Understanding the crustal, tectonic, thermal, and chemical evolution of the craton is critical in placing these events into an accurate geological context, as well as developing holistic tectonic models for the Archean Earth. Here, we present a large U-Pb (420 collated samples) and Hf isotopic (2163 analyses) dataset on zircon, and apply it to constrain the evolution of the craton. These data provide strong evidence for a Hadean-Eoarchean origin for the Yilgarn Craton from mafic crust at ca. 4000?Ma, in a proto-craton consisting of the Narryer and north-central Southern Cross Domain. This ancient cratonic nucleus was subsequently rifted, expanded and reworked by successive crustal growth events at ca. 3700?Ma, ca. 3300?Ma, 3000-2900?Ma, 2825-2800?Ma, and ca. 2730-2620?Ma. The <3050?Ma crustal growth events correlate broadly with known komatiite events, and patterns of craton evolution, revealed by Hf isotope time-slice mapping, image the periodic break-up of the Yilgarn proto-continent and the formation of rift-zones between the older crustal blocks. Crustal growth and new magmatic pulses were focused into these zones and at craton margins, resulting in continent growth via internal (rift-enabled) expansion, and peripheral (crustal extraction at craton margins) magmatism. Consequently, we interpret these major geodynamic processes to be analogous to plume-lid tectonics, where the majority of tonalite-trondhjemite-granodiorite (TTG) felsic crust, and later granitic crust, was formed by reworking of hydrated mafic rocks and TTGs, respectively, via a combination of infracrustal and/or drip-tectonic settings. We argue that subduction-like processes formed a minor tectonic component, re-docking the Narryer Terrane to the craton at ca. 2740?Ma. Overall, these processes led to an intra-cratonic architecture of younger, juvenile terranes located internal and external to older, long-lived, reworked crustal blocks. This framework provided pathways that localized later magmas and fluids, driving the exceptional mineral endowment of the Yilgarn Craton.
DS202109-1473
2021
Hartnady, M.Hollis, J.C., Kirk;amd, C.., Hartnady, M., Barham, M., Steenfelt, A.Earth's continents share an ancient crustal ancestor.Eos, https://doi.org/10.1029/2021EO162087.Europe, Greenlandgeochronology - zircon

Abstract: The jigsaw fit of Earth’s continents, which long intrigued map readers and inspired many theories, was explained about 60 years ago when the foundational processes of plate tectonics came to light. Topographic and magnetic maps of the ocean floor revealed that the crust—the thin, rigid top layer of the solid Earth—is split into plates. These plates were found to shift gradually around the surface atop a ductile upper mantle layer called the asthenosphere. Where dense oceanic crust abuts thicker, buoyant continents, the denser crust plunges back into the mantle beneath. Above these subduction zones, upwelling mantle melt generates volcanoes, spewing lava and creating new continental crust.
DS201904-0743
2019
Hartnady, M.I.H.Hartnady, M.I.H., Kirkland, C.L.A gradual transition to plate tectonics on Earth between 3.2 and 2.7 billion years ago.Terra Nova, Vol. 31, 2, pp. 129-134.Mantleplate tectonics

Abstract: Zircon crystals precipitated from granitoid magmas contain a robust record of the age and chemistry of continental magmatism spanning some 4.375 Ga of Earth history, a record that charts initiation of plate tectonics. However, constraining when exactly plate tectonics began to dominate crustal growth processes is challenging as the geochemical signatures of individual rocks may reflect local subduction processes rather than global plate tectonics. Here we apply counting statistics to a global database of coupled U-Pb and Hf isotope analyses on magmatic zircon grains from continental igneous and sedimentary rocks to quantify changes in the compositions of their source rocks. The analysis reveals a globally significant change in the sources of granitoid magmas between 3.2 and 2.7 Ga. These secular changes in zircon chemistry are driven by a coupling of the deep (depleted mantle) and shallow (crustal) Earth reservoirs, consistent with a geodynamic regime dominated by Wilson cycle style plate tectonics.
DS202202-0194
2022
Hartnady, M.I.H.Hartnady, M.I.H., Kirkland, C., Smithies, R.H., Johnson, T.E.Pb isotope insight into the formation of the Earth's first stable continents.Earth and planetary Science Letters, Vol. 578, 117319, 9p. PdfMantlegeochronolgy

Abstract: The formation of stable buoyant continental crust during the Archaean Eon was fundamental in establishing the planet's geochemical reservoirs. However, the processes that created Earth's first continents and the timescales over which they formed are debated. Here, we report the Pb isotope compositions of K-feldspar grains from 52 Paleoarchaean to Neoarchaean granites from the Pilbara Craton in Western Australia, one of the world's oldest and best-preserved granite-greenstone terranes. The Pb isotope composition of the Pilbara K-feldspars is variable, implying the granites were derived from crustal precursors of different age and/or variable time-integrated 238U/204Pb and 232Th/204Pb compositions. Trends to sub-mantle 207Pb/206Pb ratios preclude the influence of 4.3 Ga crustal precursors. In order to estimate crustal residence times we derive equations to calculate source model ages in a linearized Pb isotope evolution system. The best agreement between the feldspar Pb two-stage source model ages and those derived from zircon initial Hf isotope compositions requires crustal precursors that separated from a chondritic mantle source between 3.2 and 3.8 Ga, and rapidly differentiated to continental crust with 238U/204Pb and 232Th/238U ratios of ?14 and 4.2-4.5, respectively. The preservation of Pb isotope variability in the Pilbara Paleoarchaean granites indicates their early continental source rocks were preserved for up to 500 Ma after their formation. The apparent longevity of these early continental nuclei is consistent with the incipient development of buoyant melt-depleted cratonic lithosphere during the Eoarchaean to Paleoarchaean.
DS1900-0759
1909
Hartog, V.Hartog, V.Petrographic Note on Diamond Bearing Peridotite of Kimberley, De Beers mineEconomic Geology, Vol. 4, PP. 438-453. ALSO: Neues Jahrbuch f?r Mineralogie, 1911, BD. 2, PAfrica, South AfricaPetrology
DS1985-0293
1985
Hartree, R.Hogarth, D.D., Hartree, R., Loop, J., Solberg, T.N.Rare Earth Element Minerals in Four Carbonatites Near Gatineau QuebecAmerican Mineralogist, Vol. 70, pp. 1135-1142QuebecCarbonatite, Rare Earths
DS1989-0829
1989
Hartree, R.Kretz, R., Loop, J., Hartree, R.Petrology and Li-Be-B geochemistry of muscovite-biotite granite and associated pegmatite near Yellowknife, CanadaContributions to Mineralogy and Petrology, Vol. 102, No. 2, pp. 174-190Northwest TerritoriesRare earths, Geochemistry
DS1860-0108
1870
Hartt, E.F.Hartt, E.F.Scientific Results of a Journey in Brasil. Geology and Physical Geography.Boston: Osgood And Co., 600P., ( DIAMOND FIELDS PP. 294-332; PP. 368-373; PP.496-504)South America, BrazilGeology
DS1950-0474
1959
Hartwell, J.W.Hartwell, J.W., Brett, B.A.Gem Stones; United States Geological Survey (usgs), 1958United States Geological Survey (USGS) MINERALS YEARBOOK, FOR 1958, PP. 467-478.Canada, British Columbia, South America, Brazil, GuyanaReview Of Current Activites
DS1960-0055
1960
Hartwell, J.W.Hartwell, J.W.Gem Stones; United States Bureau of Mines, 1960United States Bureau of Mines MINERAL FACTS AND PROBLEMS, Bulletin. No. 585., PP. B63-B64.United States, Great Lakes, IllinoisDiamond Occurrences
DS1960-0056
1960
Hartwell, J.W.Hartwell, J.W., Brett, B.A.Gem Stones; United States Geological Survey (usgs), 1960United States Geological Survey (USGS) MINERALS YEARBOOK, FOR 1959, PP. 471-483.Brazil, Guyana, Venezuela, Russia, India, Israel, GuineaReview Of Current Activities
DS1960-0151
1961
Hartwell, J.W.Hartwell, J.W., Brett, B.A.Gem Stones; Minerals Yearbook: Metals and Minerals, 1961Minerals Yearbook: Metals And Minerals, Vol. 1, PP. 585-596.United States, Canada, Gulf Coast, Arkansas, Pennsylvania, Russia, Brazil, TanzaniaProduction, Imports, Review
DS1960-0248
1962
Hartwell, J.W.Hartwell, J.W., Brett, B.A.Gems StonesUnited States Bureau of Mines MINERALS YEARBOOK FOR 1962, Vol. 1, P. 586.United States, Great LakesDiamond Occurrence
DS201012-0081
2009
HartwigBurns, R.C., Chumakov, A.I., Connell, Dube, Godfried, Hansen, Hartwig, Hoszowska, Masiello, Mkonza, RebakHPHT growth and x-ray characterization of the high quality type IIa diamond.Journal of Physics Condensed Matter, Vol. 21, 36, pp. 364224-364237.TechnologyType II a
DS2002-0666
2002
Hartz, E.H.Hartz, E.H., Torsvik, T.H.Baltica and Siberia inverted: a new Rodinia reconstruction linking the break up of the Iapetus Ocean and the Aegir Sea to the peri-Gondwana events.Geological Society of America Annual Meeting Oct. 27-30, Abstract p. 559.Greenland, RussiaTectonics - rifting, terranes, Gondwana
DS2002-0667
2002
Hartz, E.H.Hartz, E.H., Torsvik, T.H.Baltica upside down: a new plate tectonic model for Rodinia and the Iaperus OceanGeology, Vol.30,3,March,pp.255-8.Rodinia, Baltica, AvaloniaPaleomagnetism - Wilson cycle, Tectonics
DS200812-0450
2008
Hartz, E.H.Hartz, E.H., Podladchikov, Y.Y.Toasting the jelly sandwich: the effect of shear hearting on lithospheric geotherms and strength.Geology, Vol. 36, 4, pp. 331-4.MantleGeothermometry
DS201708-1565
2016
Haruna, A.I.Bata, T., Parnell, J., Samaila, N.K., Haruna, A.I.Anomalous occurrence of Cretaceous placer deposits: a review. Earth and Atmospheric Sciences, Vol. 1, pp. 1-13.Mantlealluvials

Abstract: During the Cretaceous, the CO2 content of the global atmosphere drastically increased in response to volcanism associated with the disintegration of the former continents. This increase in the global atmospheric CO2 level subsequently led to a considerable rise in global temperatures. The interaction among the high levels of atmospheric CO2, extreme global warmth, and humidity witnessed in the Cretaceous implies extreme environmental conditions, which involved a possibly more acidic and chemically destructive atmosphere than at present; these conditions are believed to have favoured widespread deep weathering at that time. Economically important minerals were reworked from their primary sources during these Cretaceous weathering events. The extreme global warmth witnessed in the Cretaceous also caused the melting of most of the polar ice caps, resulting in the expansion of the volume of Cretaceous seawaters, which subsequently led to a significant rise in the global sea level. Extensive palaeo-seaways played a vital role in transporting and depositing the huge volume of sediments generated during the Cretaceous weathering events, which included economically important minerals (e.g., gold, diamond, and platinum). These mineral deposits are now preserved in Cretaceous sands as placer deposits. Three categories of Cretaceous placer deposits can be distinguished: those occurring in Cretaceous sands resting unconformably on the Precambrian basement, those occurring in Cretaceous sands resting unconformably on the Palaeozoic rocks, and those occurring in Cretaceous sands that unconformably overlay Mesozoic strata.
DS2001-1318
2001
harveyZonnenfeld, J.P., Kjarsgaard, harvey, McNeilStratigraphic framework of Cretaceous diamond bearing kimberlites east central Saskatchewan.Saskatchewan Open House abstracts, Nov. p. 26.SaskatchewanStratigraphy
DS2002-1801
2002
HarveyZonneveld, J.P., Kjarsgaard, B.A., Harvey, McNeilStratigraphic framework of Cretaceous diamond bearing kimberlites, East central Saskatchewan.Saskatchewan Geological Survey, Summary Inv.,Vol.2,pp.162-3.SaskatchewanStratigraphy
DS1982-0256
1982
Harvey, B.E.Harvey, B.E.El 1880-forster Range, Nt. Annual Report Period Ending 19th. November 1981.Northern Territory Open File., CR 82/15, 8P.Australia, Northern TerritoryKimberlite, Sampling, Stream Sediment, Geochemistry, Arunta Bloc
DS1983-0288
1983
Harvey, B.E.Harvey, B.E., Jenke, G.P.El 3541 Harry Creek Annual Report for Period Ending 19/4/83Northern Territory Geological Survey Open File Report, No. CR 83/153, 18P.Australia, Northern TerritoryProspecting, Sampling, Geophysics, Geochemistry
DS1983-0289
1983
Harvey, B.E.Harvey, B.E., Jenke, G.P., Cra exploration pty. ltd.El 3501 Mud Tank Annual Report for Year Ending 19/4/83Northern Territory Geological Survey Open File Report, No. CR 83/154, 20P.Australia, Northern TerritoryProspecting, Geophysics, Geochemistry
DS2002-0668
2002
Harvey, B.E.Harvey, B.E.New competencies in mining - Rio Tinto's experienceAustralian Institute of Mining and Metallurgy, No. 3/2002, pp.169-74.AustraliaMining - history, indigenous, community relations, Land access, Aboriginal Foundation
DS1997-0484
1997
Harvey, C.C.Harvey, C.C., Alsobrook, A.F.Industrial minerals in the 21st Century: a perspective of trends inmarkets, technologies and applicationsSociety for Mining, Metallurgy and Exploration (SME) Preprint, No. 97-124, 7pGlobalEconomics, Industrials
DS201312-0011
2013
Harvey, F.Ahlqvist, O., Harvey, F., Ban, H., Chen, W., Fonanella, S., Guo, M.,Singh, N.Making journal articles 'live': turning academic writing into scientific dialog.Geojournal, Vol. 78, 1, pp. 61-68.TechnologyKnowledge dissemination
DS1860-0511
1886
Harvey, F.L.Harvey, F.L.Minerals and Rocks of Arkansas, a Catalog of the SpeciesGrant And Faires, Philadelphia., 32P.United States, ArkansasPetrology
DS200712-0407
2007
Harvey, J.Hammond, S.J., Parkinson, I.J., James, R.H., Rogers, N.W., Harvey, J.Delta 7 Li systematics of mantle xenoliths from Kilbourne Hole: unravelling metasomatic and differential processes.Plates, Plumes, and Paradigms, 1p. abstract p. A373.United States, New Mexico, Colorado PlateauMetasomatism
DS201112-0416
2011
Harvey, J.Harvey, J., Dale, C.W., Gannoun, A., Burton, K.W.Osmium mass balance in peridotite and the effects of mantle derived sulphides on basalt petrogenesis.Geochimica et Cosmochimica Acta, Vol. 75, 9, pp. 5574-5596.United States, New Mexico, Colorado PlateauKilbourne
DS201212-0287
2012
Harvey, J.Harvey, J., Yoshikawa, M., Hammond, S.J., Burton, K.W.Deciphering the trace element characteristics in Kilbourne Hole peridotite xenoliths: melt-rock interaction and metasomatism beneath the Rio Grande rift, SW USA.Journal of Petrology, Vol. 53, 8, pp. 1709-1742.United StatesXenoliths
DS201508-0356
2015
Harvey, J.Harvey, J., Konig, S., Luguet, A.The effects of melt depletion and metasomatism on highly siderophile and strongly chalcophile elements: S-Se-Te-Re-PGE systematics of peridotite xenoliths from Kilbourne Hole, New Mexico.Geochimica et Cosmochimica Acta, Vol. 166, pp. 210-233.United States, New Mexico, Colorado PlateauPeridotite, xenoliths
DS201602-0209
2016
Harvey, J.Harvey, J., Warren, J.M., Shirey, S.B.Mantle sulfides and their role in Re-Os and Pb isotope geochronology.Reviews in Mineralogy and Geochemistry, Vol. 81, pp. 579-649.MantleGeochronology
DS201602-0210
2016
Harvey, J.Harvey, J., Warren, J.M., Shirey, S.B.Mantle sulfides and their role in Re-Os and Pb isotope geochronology.Reviews in Mineralogy and Geochemistry, Vol. 81, pp. 579-649.Geochronology
DS2002-0669
2002
Harvey, J.D.Harvey, J.D., De Wit, M.J., Stankiewicz, J., DoucoureStructural variations of the crust in the southwestern Cape, deduced from seismic receiver functions.South Africa Journal of Geology, Vol. 104, pp. 231-42.South AfricaKaapvaal Craton, Tectonics
DS1994-1901
1994
Harvey, P.K.Whateley, M.K.G., Harvey, P.K.Mineral resource evaluation II methods and case historiesGeological Society of London Special Publication, No. 79, 270pChile, Sweden, ZambiaBook -table of contents, Geostatistics, ore evaluation, ore reserves, economics
DS1997-0697
1997
Harvey, P.K.Lovell, M.A., Harvey, P.K.Developments in petrophysicsGeological Society of London Spec. Pub, No. 122, 395pGlobalBook - table of contents, Petrophysics
DS2002-0819
2002
Harvey, S.Kelley, L., Harvey, S., Jellicoe, B.Diamondiferous kimberlites of central SaskatchewanGac/mac Annual Meeting, Saskatoon, Abstract Volume, P.59., p.59.SaskatchewanGeochronology, stratigraphy, petrology, Deposit - Fort a la Corne
DS2002-0820
2002
Harvey, S.Kelley, L., Harvey, S., Jellicoe, B.Diamondiferous kimberlites of central SaskatchewanGac/mac Annual Meeting, Saskatoon, Abstract Volume, P.59., p.59.SaskatchewanGeochronology, stratigraphy, petrology, Deposit - Fort a la Corne
DS200512-0505
2005
Harvey, S.Kelley, L., Harvey, S., et al.Diamonds: Fort a la Corne overview.Saskatchewan Exploration and Development Highlights 2004, Feb 15, PDAC pp. 17-23.Canada, SaskatchewanBrief - review
DS200512-0540
2005
Harvey, S.Kjarsgaard, B., Harvey, S., Zonneveld, J-P.An overview of the geology and exploration history of the Fort a la Corne kimberlite field, Saskatchewan.British Columbia & Yukon Mineral Exploration Roundup, Jan.24-27th., p. 81-82.Canada, SaskatchewanNews item - brief overview
DS200612-0547
2006
Harvey, S.Harvey, S., Kjarsgaard, B.A., Zonneveld, J.P., Heaman, L.M., McNeil, D.Volcanology and sedimentology of distinct eruptive phases at the Star kimberlite, Fort a la Corne field, Saskatchewan.Emplacement Workshop held September, 5p. extended abstractCanada, SaskatchewanDeposit - Star geology
DS200812-1327
2007
Harvey, S.Zonneveld, J-P., Kjarsgaard, B.A., Harvey, S., McNeil, D.H.The influence of depositional setting and fluctuating accommodation space on kimberlite edifice preservation: implications for volcanological models Fort a la Corne.Geological Society of America Annual Meeting 2007, Denver Oct. 28, 1p. AbstractCanada, SaskatchewanFALC kimberlites
DS200912-0285
2009
Harvey, S.Harvey, S., Kjarsgaard, McClintock, M., Shimell, M., Fourie, L., Du Plessis, P., Read, G.Geology and evaluation strategy of the Star and Orion South kimberlites, Fort a la Corne, Canada.Lithos, In press availableCanada, SaskatchewanDeposit - Star, Orion
DS200912-0384
2009
Harvey, S.Kjarsgaard, B.A., Harvey, S., McClintock, M., Zonneveld, J.P., Du Plessis, P., McNeil, D., Heaman, L.Geology of the Orion South kimberlite, Fort a la Corne, Canada.Lithos, In press - available formatted 15p.Canada, SaskatchewanDeposit - Orion South
DS201212-0288
2012
Harvey, S.Harvey, S., Read, G., DesGagnes, B., Shimell, M., Danoczi, J., Van Breugel, B., Fourie, L., Stilling, A.Utilization of olivine macrocryst grain size and abundance dat a as a proxy for diamond size and grade in pyroclastic deposits of the Orion South kimberlite Fort a la Corne, Sasakatchewan, Canada.10th. International Kimberlite Conference Feb. 6-11, Bangalore India, AbstractCanada, SaskatchewanDeposit - Orion South
DS201312-0367
2013
Harvey, S.Harvey, S., Read, G., DesGagnes, B., Shimell, M.Utilization of olivine macrocryst grain size and abundance dat a as a proxy for diamond size and grade in pyroclastic deposits of the Orion South kimberlite, Fort a la Corne, Saskatchewan, Canada.Proceedings of the 10th. International Kimberlite Conference, Vol. 2, Special Issue of the Journal of the Geological Society of India,, Vol. 2, pp. 79-95.Canada, SaskatchewanDeposit - Orion South
DS201412-0344
2013
Harvey, S.Harvey, S., Read, G., DesGagnes, B., Shimell, M., van Breugel, B., Fourie, L.Utilization of olivine macrocryst grain size and abundance dat a as a proxy for diamond size and grade in pyroclastic deposits of the Orion South kimberlite, Fort a la Corne, Saskatchewan, Canada.Proceedings of the 10th. International Kimberlite Conference, Vol. 2, pp. 79-96.Canada, SaskatchewanDeposit - Orion South
DS2001-0456
2001
Harvey, S.E.Harvey, S.E., Kjarsgaard, Jellicoe, KelleyHistory and current status of diamond exploration in SaskatchewanSaskatchewan Open House abstracts, Nov. p. 23.SaskatchewanHistory - brief
DS2001-0457
2001
Harvey, S.E.Harvey, S.E., Kjarsgaard, KelleyKimberlites of central Sask.: compilation and significance of indicator mineral geochemistry ...Saskatchewan Open House abstracts, Nov. p. 25.SaskatchewanHistory - brief, Diamond potential
DS2001-0458
2001
Harvey, S.E.Harvey, S.E., Zonnefeld, Kjarsgaard,Delaney, KelleyTargeted geoscience initiative (TGI) project - Diamondiferous kimberlites of central Sask. overviewSaskatchewan Open House abstracts, Nov. p. 24.SaskatchewanHistory - brief
DS2002-0670
2002
Harvey, S.E.Harvey, S.E., Kjarsgaard, B.A., Kelley, L.I.Significance of indicator mineral geochemistry with respect to diamond potential of central Saskatchewan..Gac/mac Annual Meeting, Saskatoon, Abstract Volume, P.47., p.47.SaskatchewanGeochemistry - diamond inclusions
DS2002-0671
2002
Harvey, S.E.Harvey, S.E., Kjarsgaard, B.A., Kelley, L.I.Significance of indicator mineral geochemistry with respect to diamond potential of central Saskatchewan..Gac/mac Annual Meeting, Saskatoon, Abstract Volume, P.47., p.47.SaskatchewanGeochemistry - diamond inclusions
DS2002-0672
2002
Harvey, S.E.Harvey, S.E., Kjarsgaard, B.A., Kelley, L.I.Kimberlites of Central Saskatchewan: compilation and significance of indicator mineral chemistry..potentialSaskatchewan Geological Survey, Summary Inv.,Vol.2,pp.147-61.SaskatchewanGeochemistry - diamond potential
DS2002-0673
2002
Harvey, S.E.Harvey, S.E., Zonneveld, J.P., Delaney, G.D., Kelley, L.Targeted geoscience initiative (TGI) project - Diamondiferous kimberlites of central Sask. - overview.Saskatchewan Geological Survey, Summary Inv.,Vol.2,pp.144-6.SaskatchewanData storage, high resolution 3D, seismic, Stratigraphy
DS2003-0560
2003
Harvey, S.E.Harvey, S.E., Kjarsgaard, B.A., Kelley, L.I.Kimberlites of central Saskatchewan: complications and significance of indicator mineral8 Ikc Www.venuewest.com/8ikc/program.htm, Session 8, POSTER abstractSaskatchewanBlank
DS2003-1566
2003
Harvey, S.E.Zonneveld, J.P., Kjarsgaard, B.A., Harvey, S.E., Marcia, K.Y., McNeil, D.Sedimentologic and stratigrahic constraints on emplacement of the Star kimberlite, east8 Ikc Www.venuewest.com/8ikc/program.htm, Session 1, AbstractSaskatchewanGeology, economics, Deposit - Star
DS200412-0802
2003
Harvey, S.E.Harvey, S.E., Kjarsgaard, B.A., Kelley, L.I.Kimberlites of central Saskatchewan: complications and significance of indicator mineral geochemistry with respect to diamond po8 IKC Program, Session 8, POSTER abstractCanada, SaskatchewanDiamond exploration
DS200412-2238
2003
Harvey, S.E.Zonneveld, J.P., Kjarsgaard, B.A., Harvey, S.E., Marcia, K.Y., McNeil, D., Heaman, L.M., White, D.J.Sedimentologic and stratigrahic constraints on emplacement of the Star kimberlite, east central Saskatchewan.8 IKC Program, Session 1, AbstractCanada, SaskatchewanGeology, economics Deposit - Star
DS200612-0706
2006
Harvey, S.E.Kjarsgaard, B.A., Harvey, S.E., Zonneveld, J.P., Heaman, L.M., White, D., MacNeil, D.Volcanic stratigraphy, eruptive sequences and emplacement of the 140/141 kimberlite Fort a la Corne field, Saskatchewan.Emplacement Workshop held September, 5p. extended abstractCanada, SaskatchewanDeposit - 140/141 geology
DS200612-1620
2006
Harvey, S.E.Zonnenveld, J.P., Kjarsgaard, B.A., Harvey, S.E., McNeil, D.Accommodation space and kimberlite edifice preservation: implications for volcanological models of Fort a La Corne kimberlites.Emplacement Workshop held September, 5p. abstractCanada, SaskatchewanDeposit - Star, 140/141, eruptive sequence
DS1910-0057
1910
Harvie, R.Harvie, R.On the Origin and Relations of the Palaeozoic Breccia of The Vicinity of Montreal.Royal Society. CAN. Transactions, Vol. 3, PP. 249-299.Canada, QuebecBlank
DS200712-0417
2007
Harwood, B.P.Harwood, B.P.Development of a new technique for classifying garnet and ilmenite from kimberlite, using crystal structural information.Geological Association of Canada, Gac-Mac Yellowknife 2007, May 23-25, Volume 32, 1 pg. abstract p.38.Africa, South Africa, United States, Wyoming, Canada, Ontario, AttawapiskatXRD
DS200912-0286
2009
Harwood, B.P.Harwood, B.P.,Flemming, R.L.Crystal chemicak relationships in diamond indicating peridotitic and eclogitic garnets.GAC/MAC/AGU Meeting held May 23-27 Toronto, Abstract onlyTechnologyMineral chemistry and crystallography
DS1930-0110
1932
Harwood, H.F.Holmes, A., Harwood, H.F.Petrology of the Volcanic Fields East and Southeast of Ruwenzori, Uganda.Quarterly Journal of Geological Society (London), Vol. 88, PP. 390-442.GlobalPetrology
DS201412-0969
2014
Hasalova, P.Weinberg, R.F., Hasalova, P.Water fluxed melting of the continental crust: a review.Lithos, in press availableMantleMelting
DS1989-0597
1989
Hasan, M.TalibHasan, M.Talib, AsarullahPhosphate (apatite) resources in the Loe Shilman carbonatite Khyber northwest Frontier Province, PakistanPhosphate deposits of the World, Vol. 2, pp. 455-457PakistanApatite, Carbonatite
DS1996-0610
1996
Hasan, S.E.Hasan, S.E.Geology and hazardous waste managementPrentice Hall, 400p. approx. $ 75.00GlobalBook - table of contents, Environment - hazardous waste
DS1990-0670
1990
Hasbrouck, W.P.Hasbrouck, W.P.Computer programs in HP 9845 BASIC for modeling and interpreting multiplelayer, plane interface shallow refraction seismicsUnited States Geological Survey (USGS) Open File, No. 90-0473, 56p. $ 8.50GlobalComputer, Program -Seismics
DS2003-0561
2003
Haschke, M.Haschke, M., Gunthe, A.Balancing crustal thickening in arcs by tectonic vs magmatic meansGeology, Vol. 31, 11, pp. 933-36.MantleTectonics
DS200412-0803
2003
Haschke, M.Haschke, M., Gunthe, A.Balancing crustal thickening in arcs by tectonic vs magmatic means.Geology, Vol. 31, 11, pp. 933-36.MantleTectonics
DS202009-1649
2020
Haseawa, A.Okuda, Y., Ohta, K., Haseawa, A., Yagi, T., Hirose, K., Kawaguchi, S.I., Ohishi, Y.Thermal conductivity of Fe bearing post- perovskite in the Earth's lowermost mantle.Earth and Planetary Science Letters, Vol. 547, 9p. PdfMantleperovskite

Abstract: The thermal conductivity of post-perovskite (ppv), the highest-pressure polymorph of MgSiO3 in the Earth's mantle, is one of the most important transport properties for providing better constraints on the temperature profile and dynamics at the core-mantle boundary (CMB). Incorporation of Fe into ppv can affect its conductivity, which has never been experimentally investigated. Here we determined the lattice thermal conductivities of ppv containing 3 mol% and 10 mol% of Fe at high P-T conditions - of pressures up to 149 GPa and 177 GPa, respectively, and temperatures up to 1560 K - by means of the recently developed pulsed light heating thermoreflectance technique combining continuous wave heating lasers. We found that the incorporation of Fe into ppv moderately reduces its lattice thermal conductivity as it increases the Fe content. The bulk conductivity of ppv dominant pyrolite is estimated as 1.5 times higher than that of pyrolite consisting of bridgmanite and ferropericlase in the lower mantle, which agrees with the traditional view that ppv acts as a better heat conductor than bridgmanite in the Earth's lowermost mantle.
DS200912-0475
2009
Hasegawa, A.Maruyama, S., Hasegawa, A., Santosh, M., Kogiso, T., Omori, S., Nakamura, H., Kawai, K., Zhao, D.The dynamics of big mantle wedge, magma factory, and metamorphic-metasomatic factory in subduction zones.Gondwana Research, Vol. 16, 3-4, pp. 414-430.MantleSubduction
DS1983-0232
1983
Hasegawa, H.Forsyth, D., Morel, P., Hasegawa, H., Wetmiller, R., Adams, J.Comparative Study of the Geophysical and Geological InformatAtomic Energy of Canada Research Limited., No. TR-238, 52P.Canada, OntarioTectonics
DS1975-0756
1978
Haselhurst, D.Haselhurst, D.Your Guide to the Diamond HopefulsThe Bulletin., SEPT. 19TH. PP. 108-109.Australia, Western AustraliaListing Of Companies
DS1975-1057
1979
Haselhurst, D.Haselhurst, D.Diamonds- the Boom With an Academic BeginningThe Bulletin, Vol. 99, No. 5126, PP. 40-45; PP. 108-109.AustraliaLeucite, Lamproite
DS1981-0205
1981
Haselhurst, D.Haselhurst, D.A Cold Look at Ashton: Its No BonanzaThe Bulletin., JUNE 23RD. PP. 118-122; P. 128.Australia, Western AustraliaKimberlite, Argyle
DS200512-0433
2004
Haselip, J.Hilson, G., Haselip, J.The environmental and socioeconomic performance of multinational mining companies in the developing world economy.Minerals & Energy - Raw Materials Report, Vol. 19, 3, Sept. pp. 23-47.GlobalEnvironmental
DS1975-1058
1979
Haselton, H.T.Haselton, H.T.Calorimetry of Synthetic Pyrope Grossular Garnets and Calculated Stability Relations.Chicago: Ph.d. Thesis, University Chicago, 98P.GlobalBlank
DS1980-0163
1980
Haselton, H.T.Haselton, H.T., Newton, R.C.Thermodynamics of Pyrope Grossular Garnets and Their Stabilities at High Temperature and High Pressures.Journal of Geophysical Research, Vol. 85, B 12, PP. 6973-6982.GlobalMineralogy
DS1989-0904
1989
HasenakaLuhr, J.F., Allan, J.F., Carmichael, S.E., Nelson, S.A., HasenakaPrimitive calc-alkaline and alkaline rock types From the western Mexican volcanic beltJournal of Geophysical Research, Vol. 94, No. B4, pp. 4515-4530MexicoMinette, basanite, Alkaline rocks
DS200712-0750
2007
Hasenclever, J.Morgan, J.P., Hasenclever, J., Hort, M., Rupke, L., Parmentier, E.M.On subducting slab entrainment of buoyant asthenosphere.Terra Nova, Vol. 19, pp. 167-173.MantleSubduction
DS201112-0417
2011
Hasenclever, J.Hasenclever, J., Morgan, J.P., Hort, M., Rupke, L.H.2D and 3D numerical models on compositionally buoyant diapirs in the mantle wedge.Earth and Planetary Science Letters, Vol. 311, 1-2, pp. 53-68.MantleSubduction
DS1991-0682
1991
Hasenfeld, H.Hasenfeld, H.New York's role in the international diamond marketInternational Gemological Symposium, June 20-24, 1991 Los Angeles, Gems and Gemology, Vol. 27, Spring, Program p. 2GlobalDiamond market
DS1992-0680
1992
Hasenfeld, H.Hasenfeld, H.The New York diamond market of the 90's facing the future challengeGemological Institute of America, Proceedings Volume ed. A. Keller, p. 52-53. (abstract)United StatesEconomics, Diamond market
DS200712-0418
2006
Hasenfeld, H.Hasenfeld, H.The diamond dealer's perspective.Gems & Gemology, 4th International Symposium abstracts, Fall 2006, p.48. abstract onlyGlobalEconomics
DS1990-1030
1990
Haser, A.Menner, A.V., Haser, A.Morphology features of lonsdeleite-containing diamondsInternational Mineralogical Association Meeting Held June, 1990 Beijing China, Vol. 1, extended abstract p. 79-80GlobalDiamond morphology, Lonsdeleite
DS1984-0256
1984
Hashad, M.H.El haddad, M.A., Hashad, M.H.The major and minor elements chemistry of Gebel Tarbtie carbonatites southEgyptBulletin. Faculty of Science Sect. C. Assiut Univ, Vol. 13, No. 1, pp. 205-217EgyptSovite
DS1989-0553
1989
Hashchak, M.S.Gritsik, V.V., Hashchak, M.S., Poberezhskiy, V.A.The insignificant role of parental carbon fractionation during the synthesis of native impact and synthetic diamonds.(Russian)Mineralogischeskiy Sbornik, (L'vov), (Russian), Vol. 43, No. 1, pp. 95-96RussiaMineral chemistry
DS1998-0713
1998
Hashizume, K.Kamijo, K., Hashizume, K., Matsuda, J.I.Noble gas constraints on the evolution of the atmosphere mantle systemGeochimica et Cosmochimica Acta, Vol. 62, No. 13, July pp. 2311-22.MantleDegassing, helium
DS1998-1166
1998
HashuizumePinti, D.L., Hashuizume, MatsudaNitrogen and argon isotopes in the Archean continental crust: investigating the evolution of the early earth.Mineralogical Magazine, Goldschmidt abstract, Vol. 62A, p. 1186-7.MantleVolatiles, BIF samples - not specific to diamond
DS201112-0752
2011
Hasiguchi, Y.Ogassawara, Y., Hasiguchi, Y., Igarashi, M., Harada, Y.Microdiamonds: a relict of intermediate phase for diamond formation.Geological Society of America, Annual Meeting, Minneapolis, Oct. 9-12, abstractRussiaKokchetav massif, UHP
DS201603-0384
2016
Hasiuk, F.Hasiuk, F., Harding, C.Touchable topography: 3 D printing elevation dat a and structural models to overcome the issue of scale.Geology Today, Vol. 32, 1, pp. 16-20.TechnologyPrinters - not specific to diamonds
DS1990-0671
1990
Haskin, L.A.Haskin, L.A.PREEconceptions PREEvent pREEcise pREEdictionsGeochimica et Cosmochimica Acta, Vol. 54, pp. 2353-2361GlobalRare earth elements, Geochemistry
DS1990-0672
1990
Haskin, L.A.Haskin, L.A.PREEconceptions pREEvent PRRRcise pREEdictionsGeochim. Cosmochim Acta, Vol. 54, pp. 2353-61.GlobalRare earths, Geochemistry
DS1992-0642
1992
Haskin, L.A.Haas, J.R., Haskin, L.A., Luhr, J.F., Bowring, S.A., Rasskazov, S.Y.Petrogenesis of quaternary basinites from the Bartoy Volcanic Field of the Baikal Rift Zone, Siberia, RussiaEos Transactions, Vol. 73, No. 14, April 7, supplement abstracts p.334Russia, Siberia, RussiaBasinite, Baikal Rift Zone
DS1994-0735
1994
Haslett, J.Haslett, J., Power, G.M.Interactive computer graphics for a more open exploration of stream sediment geochemical dataComputers and Geosciences, Vol. 21, No. 1, pp. 77-88GlobalComputer, Program -graphics geochemistry
DS1990-0673
1990
Haslett, S.K.Haslett, S.K.Magnetic survey of a monchiquite intrusion in central GwentGeology Magazine, Vol. 127, No. 6, pp. 591-592GlobalGeophysics -magnetics, Monchiquite
DS1950-0067
1951
Hass, W.H.Hass, W.H.Age of Arkansaw NovaculiteAmerican Association of Petroleum Geologists Bulletin., Vol. 35, No. 12, PP. 2526-2541.United States, Gulf Coast, ArkansasGeochronology
DS1996-0611
1996
Hassan, I.Hassan, I., Kudoh, Y., Ito, E.MgSiO3 perovskite: a HRTEM studyMineralogical Magazine, Vol. 60, No. 5, Oct 1, pp. 799-804.GlobalPerovskite
DS1992-0839
1992
Hassan, M.J.Kent, R.W., Ghose, N.C., Paul, P.R., Hassan, M.J., Saunders, A.D.Coal-magma interaction: an integrated model for the emplacement of cylindrical intrusionsGeological Magazine, Vol. 129, No. 6, pp. 753-762IndiaLamproite, Magmas
DS2003-0772
2003
Hassan, R.Lange, G.M., Hassan, R., Alfieri, A.Using environmental accounts to promote sustainable development: experience inNatural Resources Forum, Vol. 27, 1, pp. 19-31.South AfricaSustainability - not specific to diamonds
DS200412-1083
2003
Hassan, R.Lange, G.M., Hassan, R., Alfieri, A.Using environmental accounts to promote sustainable development: experience in southern Africa.Natural Resources Forum, Vol. 27, 1, pp. 19-31.Africa, South AfricaSustainability - not specific to diamonds
DS201508-0357
2015
Hassan, R.Hassan, R., Flament, N., Gurnis, M., Bower, D.J., Muller, D.Provenance of plumes in global convection models.Geochemistry, Geophysics, Geosystems: G3, Vol. 16, 5m pp. 1465-1489.AfricaConvection
DS201612-2301
2016
Hassan, R.Hassan, R., Muller, R.D., Gurnis, M., Williams, S.E., Flament, N.A rapid burst in hotspot motion through the interaction of tectonics and deep mantle flow.Nature, Vol. 533, pp. 239-242.MantleHotspots

Abstract: Volcanic hotspot tracks featuring linear progressions in the age of volcanism are typical surface expressions of plate tectonic movement on top of narrow plumes of hot material within Earth’s mantle1. Seismic imaging reveals that these plumes can be of deep origin2=probably rooted on thermochemical structures in the lower mantle3, 4, 5, 6. Although palaeomagnetic and radiometric age data suggest that mantle flow can advect plume conduits laterally7, 8, the flow dynamics underlying the formation of the sharp bend occurring only in the Hawaiian-Emperor hotspot track in the Pacific Ocean remains enigmatic. Here we present palaeogeographically constrained numerical models of thermochemical convection and demonstrate that flow in the deep lower mantle under the north Pacific was anomalously vigorous between 100 million years ago and 50 million years ago as a consequence of long-lasting subduction systems, unlike those in the south Pacific. These models show a sharp bend in the Hawaiian-Emperor hotspot track arising from the interplay of plume tilt and the lateral advection of plume sources. The different trajectories of the Hawaiian and Louisville hotspot tracks arise from asymmetric deformation of thermochemical structures under the Pacific between 100 million years ago and 50 million years ago. This asymmetric deformation waned just before the Hawaiian-Emperor bend developed, owing to flow in the deepest lower mantle associated with slab descent in the north and south Pacific.
DS201707-1333
2016
Hassan, R.Hassan, R., Muller, R.D., Gurnis, M., Williams, S.E., Flament, N.A rapid burst in hotspot motion through the interaction of tectonics and deep mantle flow.Nature Geoscience, Vol. 533, 7603, pp. 239-242.Mantleplumes

Abstract: Volcanic hotspot tracks featuring linear progressions in the age of volcanism are typical surface expressions of plate tectonic movement on top of narrow plumes of hot material within Earth’s mantle1. Seismic imaging reveals that these plumes can be of deep origin2—probably rooted on thermochemical structures in the lower mantle3, 4, 5, 6. Although palaeomagnetic and radiometric age data suggest that mantle flow can advect plume conduits laterally7, 8, the flow dynamics underlying the formation of the sharp bend occurring only in the Hawaiian–Emperor hotspot track in the Pacific Ocean remains enigmatic. Here we present palaeogeographically constrained numerical models of thermochemical convection and demonstrate that flow in the deep lower mantle under the north Pacific was anomalously vigorous between 100 million years ago and 50 million years ago as a consequence of long-lasting subduction systems, unlike those in the south Pacific. These models show a sharp bend in the Hawaiian–Emperor hotspot track arising from the interplay of plume tilt and the lateral advection of plume sources. The different trajectories of the Hawaiian and Louisville hotspot tracks arise from asymmetric deformation of thermochemical structures under the Pacific between 100 million years ago and 50 million years ago. This asymmetric deformation waned just before the Hawaiian–Emperor bend developed, owing to flow in the deepest lower mantle associated with slab descent in the north and south Pacific.
DS1992-1447
1992
Hassan Abu-Assak, V.V.Sobolev, N.V., Hassan Abu-Assak, V.V., et al.Lamprophyres of Cretaceous diatremes of the Syrian RiftDoklady Academy of Sciences USSR, Earth Science Section, Vol. 314, No. 1-6, July 1992, pp. 129-132.SyriaLamprophyres, Diatremes
DS200812-0794
2008
Hassani, R.Neves, S.P., Tommasi, A., Vauchez,A., Hassani, R.Intraplate continental deformation: influence of a heat producing layer in the lithospheric mantle.Earth and Planetary Science Letters, Vol. 274, pp. 392-400.MantleMetasomatism
DS201212-0241
2012
Hassani, R.Gibert, G., Gerbault, M., Hassani, R., Tric, E.Dependency of slab geometry on absolute velocities and conditions for cyclicity: insights from numerical modelling.Geophysical Journal International, in press availableMantleSubduction
DS200812-0451
2007
Hasselback, D.Hasselback, D.The diamond derivatives.... brief overview.Canadian Diamonds, Fall, p. 50.GlobalDiamond-backed - Derivatives
DS1988-0385
1988
Hasselgren, E.Kumarapeli, S., St. Seymour, K., Pintson, H., Hasselgren, E.volcanism on the passive margin of Laurentia: an early Palezoic analogue of Cretaceous volcanism on the northeastern American marginCanadian Journal of Earth Sciences, Vol. 25, No. 11, November pp. 1824-1833Quebec, Labrador, UngavaAllochthons, volcanism.
DS1992-0681
1992
Hasselgren, E.Hasselgren, E., Clowes, R.M., Calvert, A.J.Propagating rift pseudofaults -zones of crustal underplating imaged by multichannel seismic reflection dataGeophysical Research Letters, Vol. 19, No. 5, March 3, pp. 485-488MantleRift, Geophysics -seismics
DS1990-0262
1990
Hasselgren, E.A.Calvert, A.J., Hasselgren, E.A., Clwoes, R.M.Oceanic rift propagation- a cause of crustal underplating and seamountvolcanism.Geology, Vol. 18, No. 9, September pp. 886-889GlobalTectonics -seamount, Crust
DS1910-0058
1910
Hassert, K.Hassert, K.Deutschlands Kolonien 1910Seele, Leipzig, 657P.Southwest Africa, NamibiaKimberlite
DS201112-0418
2011
Hasterok, D.Hasterok, D., Chpman, D.S.Heat production and geotherms for the continental lithosphere.Earth and Planetary Science Letters, Vol. 307, 1-2, pp. 59-70.MantleHeat flow, geothermometry
DS201312-0368
2013
Hasterok, D.Hasterok, D.A heat flow based cooling model for tectonic plates.Earth and Planetary Science Letters, Vol. 361, pp. 34-43.MantleGeothermometry
DS202008-1394
2020
Hasterok, D.Goes, S., Hasterok, D., Schutt, D.L., Klocking, M.Continental lithospheric temperatures: a review.Physics of the Earth and Planetary Interiors, Vol. 306, 106509, 18p. PdfMantlegeothermometry

Abstract: Thermal structure of the lithosphere exerts a primary control on its strength and density and thereby its dynamic evolution as the outer thermal and mechanic boundary layer of the convecting mantle. This contribution focuses on continental lithosphere. We review constraints on thermal conductivity and heat production, geophysical and geochemical/petrological constraints on thermal structure of the continental lithosphere, as well as steady-state and non-steady state 1D thermal models and their applicability. Commonly used geotherm families that assume that crustal heat production contributes an approximately constant fraction of 25-40% to surface heat flow reproduce the global spread of temperatures and thermal thicknesses of the lithosphere below continents. However, we find that global variations in seismic thickness of continental lithosphere and seismically estimated variations in Moho temperature below the US are more compatible with models where upper crustal heat production is 2-3 times higher than lower crustal heat production (consistent with rock estimates) and the contribution of effective crustal heat production to thermal structure (i.e. estimated by describing thermal structure with steady-state geotherms) varies systematically from 40 to 60% in tectonically stable low surface heat flow regions to 20% or lower in higher heat flow tectonically active regions. The low effective heat production in tectonically active regions is likely partly the expression of a non-steady thermal state and advective heat transport.
DS202201-0043
2022
Hasterok, D.Tamblyn, R., Hasterok, D., Hand, M. , Gard, M.Mantle heating at ca. 2 Ga by continental insulation: evidence from granites and eclogites ** not specific to diamonds.Geology, Vol. 50, 1 pp. 91-95.Mantlethermometry
DS202202-0218
2022
Hasterok, D.Tamblyn, R., Hasterok, D., Hand, M., Gard, M.Mantle heating at ca 2 Ga by continental insulation: evidence from granites and eclogites.Geology, Vol. 50, 1, pp. 91-96.Mantleeclogites

Abstract: Igneous and metamorphic rocks contain the mineralogical and geochemical record of thermally driven processes on Earth. The generally accepted thermal budget of the mantle indicates a steady cooling trend since the Archean. The geological record, however, indicates this simple cooling model may not hold true. Subduction-related eclogites substantially emerge in the rock record from 2.1 Ga to 1.8 Ga, indicating that average mantle thermal conditions cooled below a critical threshold for widespread eclogite preservation. Following this period, eclogite disappeared again until ca. 1.1 Ga. Coincident with the transient emergence of eclogite, global granite chemistry recorded a decrease in Sr and Eu and increases in yttrium and heavy rare earth element (HREE) concentrations. These changes are most simply explained by warming of the thermal regime associated with granite genesis. We suggest that warming was caused by increased continental insulation of the mantle at this time. Ultimately, secular cooling of the mantle overcame insulation, allowing the second emergence and preservation of eclogite from ca. 1.1 Ga until present.
DS201610-1869
2016
Hastie, A.R.Hastie, A.R., Fitton, J.G., Bromiley, G.D., Butler, I.B., Oding, W.A.The origin of Earth's first continents and the onset of plate tectonics.Geology, Vol. 44, 10, pp. 855-858.MantleSubduction

Abstract: The growth and recycling of continental crust has resulted in the chemical and thermal modification of Earth's mantle, hydrosphere, atmosphere, and biosphere for ?4.0 b.y. However, knowledge of the protolith that gave rise to the first continents and whether the environment of formation was a subduction zone still remains unknown. Here, tonalite melts are formed in high P-T experiments in which primitive oceanic plateau starting material is used as an analogue for Eoarchean (3.6-4.0 Ga) oceanic crust generated at early spreading centers. The tonalites are produced at 1.6-2.2 GPa and 900-950 °C and are mixed with slab-derived aqueous fluids to generate melts that have compositions identical to that of Eoarchean continental crust. Our data support the idea that the first continents formed at ca. 4 Ga and subsequently, through the subduction and partial melting of ?30-45-km-thick Eoarchean oceanic crust, modified Earth's mantle and Eoarchean environments and ecosystems.
DS201412-0345
2014
Hastie, W.W.Hastie, W.W., Watkeys, M.K., Aubourg, C.Magma flow in dyke swarms of the Karoo LIP: implications for the mantle plume hypothesis.Gondwana Research, Vol. 25, pp. 736-755.Africa, South AfricaMagmatism - dykes
DS1975-1059
1979
Hastings, D.A.Hastings, D.A., Bacon, M.Geologic Structure and Evolution of Keta Basin, West AfricaGeological Society of America (GSA) Bulletin., Vol. 90, PP. 889-892.West Africa, GuineaStructure, Tectonics
DS1975-1060
1979
Hastings, D.A.Hastings, D.A., Sharp, W.E., Williams, H.R.An Alternative Hypothesis for the Origin of West African Kimberlites.Nature., Vol. 277, No. 5692, PP. 152-153.West Africa, GuineaKimberlite Genesis
DS1980-0164
1980
Hastings, D.A.Hastings, D.A.On the Tectonics and Metallogenesis of West Africa. a Model influenced by New Geophysical Data.Proceedings of the 26th International Geological Congress, P. 726. (abstract.).West Africa, GuineaStructure, Tectonics
DS1982-0257
1982
Hastings, D.A.Hastings, D.A.An Investigation of Magsat and Complementary Dat a Emphasizing Precambrian Shields and Adjacent Areas of West Africa And south America. #3National Technical Information Service, No. NASA CR 170090; E83-10243, 6P.South Africa, Latin America, Guyana, Brazil, Argentina, South AmericaTectonics
DS1982-0258
1982
Hastings, D.A.Hastings, D.A.An Investigation of Magsat and Complementary Dat a Emphasizing Precambrian Shields and Adjacent Areas of West Africa And south America. #2National Technical Information Service, NASA CR-169838, E83-10184, 6P.West Africa, Brazil, Argentina, Guyana, South America, GuineaMagsat, Tectonics, Structure
DS1982-0259
1982
Hastings, D.A.Hastings, D.A.On the Tectonics and Metallogenesis of West Africa: a Model incorporating New Geophysical Data.Geoexploration., Vol. 20, No. 3-4, PP. 295-327.West Africa, Ghana, Upper Volta, Mali, Guinea, Liberia, Sierra LeoneDiamond, Kimberlite, Tectonic, Geophysics
DS1982-0260
1982
Hastings, D.A.Hastings, D.A.An Investigation of Magsat and Complementary Dat a Emphasizing Precambrian Shields and Adjacent Areas of West Africa And south America. #1National Technical Information Service, NASA CR 169607, 4P.West Africa, South Africa, GuineaGeophysics
DS1983-0290
1983
Hastings, D.A.Hastings, D.A.An Updated Bouguer Anomaly Map of South Central West AfricaGeophysics, Vol. 48, No. 4, P. 65. (abstract.).GlobalGeophysics
DS1983-0291
1983
Hastings, D.A.Hastings, D.A.An Updated Bouguer Gravity Anomaly Map of South Central West Africa.Geophysics, Vol. 48, No. 8, PP. 1120-1128.GlobalGeophysics, Gravity, Tectonics, Kimberlite
DS1985-0743
1985
Hastings, D.A.Wright, J.B., Hastings, D.A., Jones, W.B., Williams, H.R.Geology and Mineral Resources of West AfricaAllen and Unwin Publ, 200pWest AfricaMineral Resources, Book -table Of Contents -listed Due To Interest
DS1986-0347
1986
Hastings, D.A.Hastings, D.A.Regional geophysical studies help interpret the tectonic framework of West Africa and northwestern South AmericaGeological Society of America (GSA) Abstract Volume, Vol. 18, No. 6, p. 630. (abstract.)Brazil, South AmericaTectonics, Geophysics
DS1992-0682
1992
Hastings, J.Hastings, J.Prospecting for gravel using geophysical techniquesMcMaster University of BSc, OntarioThesis -abstract, Geophysics, gravel, IP, electromagnetic, seismics
DS200512-0408
2004
Hastings, M.Hastings, M.Inventing the future... This is not a real diamond.. Apollo Diamond. Plant is in a secret place!Newsweek, Oct. 25, 3p. ( 1 page text).United StatesNews item - synthetic diamonds
DS201312-0369
2013
Hastings, M.G.Hastings, M.G., Cascotti, K.L., Elliott, E.M.Nitrogen and its (biogeocosmo) chemical cycling: stable isotopes as tracers of anthropogenic nitrogen sources, deposition, and impacts.Elements, Vol. 9, pp. 339-344.TechnologyNitrogen
DS1985-0263
1985
Hasui, Y.Haralyi, N.L.E., Hasui, Y., Svisero, D.P.Basement Controls of the Alkaline Province of West Minas Gerais, Brasil.International Association GENESIS of ORE DEPOSITS WORKSHOP HELD IN CONJ, ABSTRACT VOLUME P. 35. (abstract.).Brazil, Minas GeraisGeophysics, Kimberlite, Geotectonics
DS1985-0272
1985
Hasui, Y.Hasui, Y., De almeida, F.F.M.The Central Brasil Shield ReviewedEpisodes, Vol. 8, No. 1, MARCH PP. 29-37.BrazilTectonics
DS1989-0586
1989
Hasui, Y.Haralyi, N.L.E., Hasui, Y.Crustal block structure of Brasil and associated ore depositsGlobal Tectonics and Metallogeny, Vol. 3, No. 2 and 3, pp. 187-188. Extended abstractBrazilBrief mention of association of diamonds, Tectonics, Shear zones
DS1991-0664
1991
Hasui, Y.Haralyi, N.L.E., Hasui, Y.The Sopa conglomerate in the Diamantin a region, Min as GeraisFifth International Kimberlite Conferences Field Excursion Guidebook, Servico Geologico do Brasil (CPRM) Special, pp. 95-100BrazilConglomerate, Alluvial diamonds
DS1994-0712
1994
Hasui, Y.Haralyi, N.L.E., Hasui, Y., Rodriques, A.S.O segundo maior diamante Brasileiro: 602 quilatesGeosciences, Vol. 13, No. 1, pp. 213-224.BrazilDiamond
DS2001-1137
2001
Hatakeyama, T.Sumita, I., Hatakeyama, T., Yoshihara, A., Hamano, Y.Paleomagnetism of late Archean rocks of Hamersley basin, western Australia and the paleointensity...Physics of the Earth and Planetary Interiors, Vol. 128, No. 1-4, Dec. 10, pp. 223-41.AustraliaPaleomagnetism, Early Proterozoic
DS201811-2566
2018
Hatch, C.Dijkstra, A.H., Hatch, C.Mapping a hidden terrane boundary in the mantle lithosphere with lamprophyres. ( Amorica)Nature Communications, Vol. 9, p. 3770.Europe, Englandgeochronology

Abstract: Lamprophyres represent hydrous alkaline mantle melts that are a unique source of information about the composition of continental lithosphere. Throughout southwest Britain, post-Variscan lamprophyres are (ultra)potassic with strong incompatible element enrichments. Here we show that they form two distinct groups in terms of their Sr and Nd isotopic compositions, occurring on either side of a postulated, hitherto unrecognized terrane boundary. Lamprophyres emplaced north of the boundary fall on the mantle array with ?Nd ?1 to +1.6. Those south of the boundary are enriched in radiogenic Sr, have initial ?Nd values of ?0.3 to ?3.5, and are isotopically indistinguishable from similar-aged lamprophyres in Armorican massifs in Europe. We conclude that an Armorican terrane was juxtaposed against Avalonia well before the closure of the Variscan oceans and the formation of Pangea. The giant Cornubian Tin-Tungsten Ore Province and associated batholith can be accounted for by the fertility of Armorican lower crust and mantle lithosphere.
DS1995-0275
1995
Hatch, D.Carr, B., Parsons, R., Hatch, D., New, G.The fundamentals of Canadian mining taxation 1995Insight Press, 620p. $ 182.00CanadaBook -ad, Mining taxation
DS200712-0419
2006
Hatch, D.Hatch, D., Kuna, S., Fecher, J.Evaluation of an airship platform for airborne gravity gradiometry.AESC2006, Melbourne, Australia, 6p.TechnologyGravity gradiometer, FTG, Zeppelin
DS200712-0421
2007
Hatch, D.Hatton, C., Hill, S., Apter, D., Evans, S., Hatch, D., Hauser, B.Measuring the width of the diamond window by logging the lithosphere with garnet compositions.Diamonds in Kimberley Symposium & Trade Show, Bristow and De Wit held August 23-24, Kimberley, South Africa, GSSA Diamond Workshop CD slides 27Africa, South AfricaGroup I,II kimberlites- plumes, peridotites, eclogites
DS201012-0270
2010
Hatch, D.Hatch, D., Pitts, B.The De Beers airship gravity project.Australian Airborne Gravity Conference Extended Abstracts 2010, pp. 97-106.Africa, BotswanaGeophysics - gravity, Jwaneng
DS1900-0324
1905
Hatch, F.H.Hatch, F.H.The Culli nan Diamond -ájgslondonQuarterly Journal of Geological Society (London), Vol. 61, P. 89. ALSO: NATURE (London), Vol. 71, P. 549.Africa, South AfricaPremier Mine, Diamonds Notable
DS1900-0325
1905
Hatch, F.H.Hatch, F.H., Corstorphine, G.S.The Geology of South Africa (1905)London: Macmillan., 1ST. EDITION 348P. SECOND EDITION IN 1909, 379P.Africa, South AfricaRegional Geology, Kimberley
DS1900-0326
1905
Hatch, F.H.Hatch, F.H., Corstorphine, G.S.A Description of the Big Diamonds Recently Found in the Premier Mine Transvaal.Geology Magazine (London), Dec. 5, Vol. 2, PP. 170-172. ALSO: American Journal of Science, Vol. 19Africa, South AfricaDiamonds Notable, Cullinan
DS1900-0327
1905
Hatch, F.H.Hatch, F.H., Corstorphine, G.S.The Cullinan Diamond.Geological Society of South Africa Transactions, Vol. 8, PP. 26-27.Africa, South AfricaPremier Mine, Diamonds Notable
DS1900-0413
1906
Hatch, F.H.Hatch, F.H.The Geological History of South AfricaGeology Magazine, Vol. 3, PP. 97-104.; PP. 161-168.Africa, South AfricaRegional Geology
DS1900-0668
1908
Hatch, F.H.Hatch, F.H.Kimberlite and the Source of the Diamond in South AfricaNature., Vol. 77, No. 1993, Jan. 9TH. PP. 224-226.Africa, South AfricaDiamond Genesis
DS1900-0760
1909
Hatch, F.H.Hatch, F.H., et al.Topographical and Geological Terms Used Locally in South Africa.British Association Advanced Science Reports, PP. 291-296, 1908.; PP. 149-150, 1909.Africa, South AfricaHistory, Toponomy
DS1910-0287
1912
Hatch, F.H.Hatch, F.H.Description of a Diamondiferous Gem Gravel from the West Coast of Africa.Geology Magazine (London), Dec. 5, Vol. 9, PP. 106-110.GlobalAlluvial Diamond Placers, Geology, Evaluation, Prospecting, Di
DS1910-0352
1913
Hatch, F.H.Hatch, F.H., Rastall, R.H.The Petrology of Sedimentary RocksLondon: George Allen And Co., 425P.South Africa, Southwest Africa, Namibia, Zimbabwe, Liberia, BoKimberlite
DS201212-0289
2012
Hatch, G.P.Hatch, G.P.Dynamics in the global market for rare earths.Elements, Vol. 8, 5, Oct. pp. 341-346.GlobalEconomics : markets, demand, quotas, prices, supply
DS2002-0674
2002
Hatchaturov, S.Hatchaturov, S., Aksionov, N., Leonyuk, N.I.BHT processing of natural diamonds: new intense fancy green18th. International Mineralogical Association Sept. 1-6, Edinburgh, abstract p.148.GlobalDiamond - colouration
DS2003-0690
2003
HatcherKarlstrom, K.E., Sears, J.W., Holm, D.K., Williams, M.L., Wooden, HatcherSouthern Laurentia in Rodinia: collaborative compilation of a tectonic map for IGCPGeological Society of America, Annual Meeting Nov. 2-5, Abstracts p.342.RodiniaTectonics
DS200412-0954
2003
HatcherKarlstrom, K.E., Sears, J.W., Holm, D.K., Williams, M.L., Wooden, Hatcher, Finn, Price, Miller, BerquistSouthern Laurentia in Rodinia: collaborative compilation of a tectonic map for IGCP 440.Geological Society of America, Annual Meeting Nov. 2-5, Abstracts p.342.Gondwana, RodiniaTectonics
DS1987-0279
1987
Hatcher, R.D.Hatcher, R.D., Zietz, I., Litehiser, J.J.Crustal subdivisions of the eastern and central United States and a seismic boundary hypothesis for eastern seismicityGeology, Vol. 15, No. 6, June pp. 528-532MidcontinentAppalachia, Geophysics
DS2002-0675
2002
Hatcher, R.D.Hatcher, R.D.Alleghanian (Appalachian) Orogeny, a product of zipper tectonics: rotational transpressive continent continent collision and closing of ancient oceans along irregulaGeological Society of America Special Paper, No. 364, pp. 199-208.AppalachiaTectonics
DS2002-0676
2002
Hatcher, R.D.Hatcher, R.D., Zeitz, I.Crustal structure of the U.S. east of the Rockies from gravity and magnetic dat a and correlations..intraplate16th. International Conference On Basement Tectonics '02, Abstracts, 2p., 2p.AppalachiaGeophysics - seismics, Tectonics
DS2003-0219
2003
Hatcher, R.D.Carrigan, C.W., Miller, C.F., Fullagar, P.D., Bream, B.R., Hatcher, R.D., CoathIon microprobe age and geochemistry of southern Appalachian basement, withPrecambrian Research, Vol. 120, 1-2, pp. 1-36.Appalachia, United StatesGeochronology
DS200412-0285
2003
Hatcher, R.D.Carrigan, C.W., Miller, C.F., Fullagar, P.D., Bream, B.R., Hatcher, R.D., Coath, C.D.Ion microprobe age and geochemistry of southern Appalachian basement, with implications for Proterozoic and Paleozoic reconstrucPrecambrian Research, Vol. 120, 1-2, pp. 1-36.United StatesGeochronology
DS200812-0452
2007
Hatcher, R.D.Hatcher, R.D., Bream, B.R., Merschat, A.J.Tectonic map of the southern and central Appalachians: a tale of three orogens and a complete Wilson cycle.Geological Society of America, Memoir, No. 200, pp. 595-632.United States, AppalachiaTectonics
DS201012-0039
2010
Hatcher, R.D.Bartholomew, M.J., Hatcher, R.D.The Grenville orogenic cycle of southern Laurentia: unraveling sutures, rifts, and shear zones as potential piercing points for Amazonia.Journal of South American Earth Sciences, Vol. 29, 1, pp. 4-20.South AmericaTectonics
DS1990-0674
1990
Hatcher, R.D. Jr.Hatcher, R.D. Jr.The Appalachian-Ouachita orogen in the United StatesGeological Society of America (GSA) DNAG Series, Vol. F-2, 767pArkansas, OklahomaTectonics, Orogeny
DS1982-0261
1982
Hatcher, R.D.JR.Hatcher, R.D.JR., Viele, G.W.The Appalachian/ouachita Orogens: United States and MexicoIn: Perspectives On Regional Geological Synthesis, Planning, D-NAG No. 1, PP. 67-75.GlobalMid-continent, Carolina Slate Belt
DS1998-1009
1998
Hatcherm R.D. Jr., et al.Miller, C.F., Hatcherm R.D. Jr., et al.Cryptic crustal events elucidated through zone imaging and ion microprobe studies of zircon, Blue Ridge..Geology, Vol. 26, No. 5, May pp. 419-422GlobalHigh grade terrane, metamorphism
DS1950-0276
1956
Hatem, S.Hatem, S.Useless But IrreplaceableParis: Librairie Plon., 260P.GlobalDiamond, Kimberley
DS201904-0729
2019
Hatfield, D.Desharnais, G., Paiement, J.P., Hatfield, D., Poupart, N.Mining BIG data: the future of exploration targeting using machine learning.PDAC Short Course, 5p. PdfGlobaldata sets
DS201511-1847
2015
Hatfield, O.Julian, B.R., Foulger, G.R., Hatfield, O., Jackson, S.E., Simpson, E., Einbeck, J., Moore, A.Hotspots in hindsight. Mentions kimberlitesGeological Society of America Special Paper, No. 514, pp. SPE514-08.MantleHotspots

Abstract: Thorne et al. (2004), Torsvik et al. (2010; 2006) and Burke et al. (2008) have suggested that the locations of melting anomalies ("hot spots") and the original locations of large igneous provinces ("LIPs") and kimberlite pipes, lie preferentially above the margins of two "large lower-mantle shear velocity provinces", or LLSVPs, near the bottom of the mantle, and that the geographical correlations have high confidence levels (> 99.9999%) (Burke et al., 2008, Fig. 5). They conclude that the LLSVP margins are "Plume-Generation Zones", and that deep-mantle plumes cause hot spots, LIPs, and kimberlites. This conclusion raises questions about what physical processes could be responsible, because, for example, the LLSVPs are apparently dense and not abnormally hot (Trampert et al., 2004). The supposed LIP-hot spot-LLSVP correlations probably are examples of the "Hindsight Heresy" (Acton, 1959), of performing a statistical test using the same data sample that led to the initial formulation of a hypothesis. In this process, an analyst will consider and reject many competing hypotheses, but will not adjust statistical assessments correspondingly. Furthermore, an analyst will test extreme deviations of the data, , but not take this fact into account. "Hindsight heresy" errors are particularly problematical in Earth science, where it often is impossible to conduct controlled experiments. For random locations on the globe, the number of points within a specified distance of a given curve follows a cumulative binomial distribution. We use this fact to test the statistical significance of the observed hot spot-LLSVP correlation using several hot-spot catalogs and mantle models. The results indicate that the actual confidence levels of the correlations are two or three orders of magnitude smaller than claimed. The tests also show that hot spots correlate well with presumably shallowly rooted features such as spreading plate boundaries. Nevertheless, the correlations are significant at confidence levels in excess of 99%. But this is confidence that the null hypothesis of random coincidence is wrong. It is not confidence about what hypothesis is correct. The correlations probably are symptoms of as-yet-unidentified processes.
DS1900-0193
1903
Hatherley, S.Hatherley, S.Discussion of a Hoax With a DiamondSouth Africa Mines Commerce and Industry, Vol. 1, No. 4, APRIL 18TH. P. 129.Africa, South AfricaDiamond
DS200912-0056
2009
Hatioy, A.Bjorkhaug, I., Hatioy, A.Utilization of respondent-driven sampling among a population of child workers in the diamond mining sector of Sierra Leone.Global Public Health, Taylor & Francis Ingenta art1090585450, Vol. 4, 1, pp. 96-109.Africa, Sierra LeoneNews item - legal
DS200712-0420
2006
Hatleberg, J.N.Hatleberg, J.N.An exact replica of the original Mogul cut Koh-i-Noor diamond.Gems & Gemology, 4th International Symposium abstracts, Fall 2006, p.158-9. abstract onlyIndiaDiamonds notable
DS201507-0312
2015
Hatter, S.J.Gernon, T.M., Spence, S., Trueman, C.N., Taylor, R.N., Rohling, E., Hatter, S.J., Harding, I.C.Emplacement of Cabezo Maria lamproite volcano (Miocene) SE Spain.Bulletin of Volcanology, Vol. 77, 6, pp. 52-Europe, SpainLamproite
DS1990-1239
1990
Hattie, J.Rock, N., Brown, T., Hattie, J.Geological statistics on the Apple Macintosh. Overview and brief assessment of programs availableTerra Nova, Vol. 2, No. 1, pp. 93-100GlobalComputers, Macintosh programs
DS1993-0637
1993
Hattingh, J.Hattingh, J., Rust, I.C.Flood transport and deposition of tracer heavy minerals in a gravel-bed meander bend channelJournal of Sedimentary Petrology, Vol. 63, No. 5, September pp. 828-834South AfricaAlluvials
DS1993-0638
1993
Hattingh, J.Hattingh, J., Rust, I.C.Flood transport and deposition of tracer heavy minerals in a gravel bed meander bend channel.Journal of Sedimentary Petrology, Vol. 63, No. 5, September pp. 828-834.Southwest AfricaAlluvials, Heavy minerals
DS200912-0522
2009
HattonMuller, M.R., Jones, Evans, Grutter, Hatton, Garcia, Hamilton, Miensopust, Cole, Ngwisanyi, Hutchins, Fourie, Jelsma,Aravanis.Pettit, Webb, WasborgLithospheric structure, evolution and diamond prospectivity of the Rehoboth Terrane and western Kaapvaal Craton, southern Africa: constraints from broadbandLithos, In press - available 57p..Africa, South Africa, BotswanaGeophysics - broadband magnetotellurics
DS200612-0031
2006
Hatton, C.Apter, D.B., Hatton, C.Heat flow variations and layered mantle convection.Geochimica et Cosmochimica Acta, Vol. 70, 18, supp. 1, p. 19, abstract only.MantleGeothermometry
DS200712-0421
2007
Hatton, C.Hatton, C., Hill, S., Apter, D., Evans, S., Hatch, D., Hauser, B.Measuring the width of the diamond window by logging the lithosphere with garnet compositions.Diamonds in Kimberley Symposium & Trade Show, Bristow and De Wit held August 23-24, Kimberley, South Africa, GSSA Diamond Workshop CD slides 27Africa, South AfricaGroup I,II kimberlites- plumes, peridotites, eclogites
DS200712-0669
2007
Hatton, C.Maier, W.D., McDonald, I., Peltonen, P., Barnes, S-J., Gurney, J., Hatton, C.Platinum group elements in mantle xenoliths from the Kaapvaal Craton.Plates, Plumes, and Paradigms, 1p. abstract p. A614.Africa, South Africa, Botswana, LesothoKimberley, Jagersfontein, Lethlakane, Finsch, Venetia
DS200812-0453
2008
Hatton, C.Hatton, C.Foundered lower continental crust in the source of Group II kimberlites.9IKC.com, 3p. extended abstractAfrica, South AfricaMORB, subduction
DS201212-0430
2012
Hatton, C.Maier, W.D., Peltonen, P., McDonald, I., Barnes, S.J., Barnes, S-J., Hatton, C., Viljoen, F.The concentration of platinum group elements and gold in southern African and Karelian kimberlite hosted mantle xenoliths: implications for the noble metal content of the Earth's mantle.Chemical Geology, Vol. 302-303, pp. 119-135.Africa, southern AfricaKimberlite - PGM
DS201412-0346
2014
Hatton, C.Hatton, C.Dunitic cratons and Clifford's rule.GSSA Kimberley Diamond Symposium and Trade Show provisional programme, Sept. 10-12, POSTERTechnologyClifford's Rule
DS201412-0347
2014
Hatton, C.Hatton, C.Olivine composition and craton evolution.ima2014.co.za, PosterMantleOlivine
DS201707-1334
2017
Hatton, C.Hatton, C., Robey, J.The eminent eight. IKC and history of conference and the prominent delegates ( ones who initiated the idea and followed through attending all 10 conferences to date).Geobulletin, Vol. 60, 1, March pp. 19-23.GlobalIKC history
DS1975-0523
1977
Hatton, C.J.Hatton, C.J., Gurney, J.J.Kyanite Eclogites from the Roberts Victor MineProceedings of Second International Kimberlite Conference, EXTENDED ABSTRACT VOLUME.South AfricaPetrography, Mineralogy
DS1975-0524
1977
Hatton, C.J.Hatton, C.J., Gurney, J.J.Igneous Fractionation Trends in Roberts Victor EclogitesProceedings of Second International Kimberlite Conference, EXTENDED ABSTRACT VOLUME.South AfricaPetrology
DS1975-0626
1977
Hatton, C.J.Smyth, J.R., Hatton, C.J.A Coesite-sandstone Grospydite from the Roberts Victor Kimberlite.Earth and Planetary Science Letters, Vol. 34, No. 2, PP. 284-290.South AfricaPetrography
DS1975-0757
1978
Hatton, C.J.Hatton, C.J.Geochemistry and Origin of Eclogite Xenoliths from the Roberts Victor Mine.Cape Town: Ph.d. Thesis, University Cape Town., 179P.South AfricaGeochemistry
DS1975-1061
1979
Hatton, C.J.Hatton, C.J., Gurney, J.J.A Diamond Graphite Eclogite from the Roberts Victor MineProceedings of Second International Kimberlite Conference, Proceedings Vol. PP. 29-36.South AfricaPetrography
DS1984-0346
1984
Hatton, C.J.Hatton, C.J.Roberts Victor Eclogites: Formation of High Pressure Basaltic Rocks.Geological Society of South Africa Bulletin., Vol. 27, No. 4, DECEMBER 1/2P.South AfricaPetrography
DS1986-0324
1986
Hatton, C.J.Gurney, J.J., Hatton, C.J.Diamondiferous minerals from the Star mine, South Africa #1Proceedings of the Fourth International Kimberlite Conference, Held, No. 16, pp. 392-394South AfricaStar mine
DS1987-0280
1987
Hatton, C.J.Hatton, C.J., Gurney, J.J.Roberts Victor eclogites and their relation to the mantlein: Nixon, P.H. ed. Mantle xenoliths, J. Wiley, pp. 453-464South AfricaBlank
DS1989-0562
1989
Hatton, C.J.Gurney, J.J., Hatton, C.J.Diamondiferous minerals from the Star mine, South Africa #2Geological Society of Australia Inc. Blackwell Scientific Publishing, No. 14, Vol. 2, pp. 1022-1028South AfricaDeposit -Star, Diamond inclusions, Garnet
DS1991-1600
1991
Hatton, C.J.Skinner, E.M.W., Hatton, C.J., Stock, C.F., Shee, S.R.Kimberlitic olivineProceedings of Fifth International Kimberlite Conference held Araxa June 1991, Servico Geologico do Brasil (CPRM) Special, pp. 370-372South AfricaKimberlite genesis, Processes
DS1991-1610
1991
Hatton, C.J.Smith, C.B., Ramos, .N., Hatton, C.J., Horsch, H., DamarupurshadEclogite xenolith with exsolved sanidine from the Proterozoic Kuruman kimberlite province, northern Cape, R.S.A.Proceedings of Fifth International Kimberlite Conference held Araxa June 1991, Servico Geologico do Brasil (CPRM) Special, pp. 383-384South AfricaZero, geochronology, xenoliths, Eclogite xenoliths
DS1992-1420
1992
Hatton, C.J.Skinner, E.M.W., Clement, C.R., Gurney, J.J., Apter, D.B., Hatton, C.J.The distribution and tectonic setting of South African kimberlitesRussian Geology and Geophysics, Vol. 33, No. 10, pp. 26-31.South AfricaTectonics, Kimberlite distribution
DS1995-1682
1995
Hatton, C.J.Schweitzer, J.K., Hatton, C.J., De Waal, S.A.Economic potential of the Rooiberg Group: volcanic rocks in the floor and roof of the Bushveld ComplexMineralium Deposita, Vol. 30, No. 2, pp. 168-177South AfricaGeochronology, granites, Bushveld Complex
DS1997-0485
1997
Hatton, C.J.Hatton, C.J.The superocean cycleSouth African Journal of Geology, Vol. 100, 4, Dec. pp. 301-310MantleChondrites, bulk earth composition, Mantle convection, potassium, plumes
DS1997-0486
1997
Hatton, C.J.Hatton, C.J.The superocean cycleSouth African Journal of Geology, Vol. 100, 4, Dec. pp. 301-310.MantleChondrites, bulk earth composition, Mantle convection, potassium, plumes
DS1998-0593
1998
Hatton, C.J.Hatton, C.J.Did the Tristan plume play a role in the genesis of Gondwana kimberlites?Journal of African Earth Sciences, Vol. 27, 1A, p. 107. AbstractGondwanaPlume
DS1998-0594
1998
Hatton, C.J.Hatton, C.J.The difference between sheared and granular peridotites7th International Kimberlite Conference Abstract, pp. 311-13.South AfricaPeridotites, Majorite, Metasomatism, Deposit - Monastery
DS1998-0595
1998
Hatton, C.J.Hatton, C.J.The kimberlite - megacryst link at Monastery mine7th International Kimberlite Conference Abstract, pp. 314-6.South AfricaPlume magma, mineralogy, Deposit - Monastery
DS1989-0598
1989
Hatton, L.Hatton, L.Computer science for geophysicists. Part IX:the reliability of geophysical and otherwiseFirst Break, Vol. 7, No. 4, April pp. 124- 132. Database # 17821GlobalGeophysics, Computer -general outline
DS1989-0599
1989
Hattori, K.Hattori, K.Pervasive alteration related to lamprophyre intrusion in the Kirkland Lake gold camp, Abitibi GreenstonebeltGeological Association of Canada (GAC) Annual Meeting Program Abstracts, Vol. 14, p. A80. (abstract.)OntarioLamprophyre dikes
DS1989-0600
1989
Hattori, K.Hattori, K.Barite celestite intergrowths in Archean plutons: the product of oxidizing hydrothermal activity related to alkaline intrusions.American Mineralogist, Vol. 74, pp. 1270-77.Ontario, Kirkland LakeAlkaline rocks
DS1996-0612
1996
Hattori, K.Hattori, K., Hart, S.R., Shimizu, N.Melt and source mantle compositions in Late Archean: a study of strontium neodymium isotope trace elements.Geochimica et Cosmochimica Acta, Vol. 60, No. 22, pp. 4551-62.QuebecLamprophyryes, clinopyroxenes, shoshonites, Geochemistry - alkaline rocks
DS1999-0298
1999
Hattori, K.Hattori, K., Percival, J.A.Archean carbonate bearing alkaline igneous complexes of the western Queticometa sedimentary belt Superior ProvinceGeological Survey of Canada (GSC), Current Research 1999- C, pp. 221-232.OntarioAlkaline rocks
DS200712-1131
2007
Hattori, K.Wang, J., Hattori, K., Killan, R., Stern, C.Metasomatism of sub arc mantle peridotites below southernmost South America: reduction of f02 by slab melt.Contributions to Mineralogy and Petrology, Vol. 153, 5, pp. 607-624.South AmericaMelting
DS200812-0454
2008
Hattori, K.Hattori, K., Hamilton, S.Geochemistry of peat over kimberlites in the Attawapiskat area, James Bay Lowlands, northern Ontario.Applied Geochemistry, Vol. 23, 12, pp. 3767-3782.Canada, Ontario, Attawapiskat, James Bay LowlandsDeposit - Victor
DS201312-0769
2013
Hattori, K.Sader, J.A., Hattori, K., Brauneder, K., Hamilton, S.M.The influence of buried kimberlite on methane production in overlying sediment, Attawapiskat region, James Bay lowlands, Ontario.Chemical Geology, Vol. 360-361, pp. 173-185.Canada, Ontario, AttawapiskatMethane
DS201312-0950
2013
Hattori, K.Wang, J., Hattori, K., Xie, Z.Oxidation state of lithospheric mantle along the northeastern margin of the North Chin a craton: implications for geodynamic processes.International Geology Review, Vol. 55, no. 11, pp. 1418-1444.ChinaGeodynamics
DS201312-0987
2013
Hattori, K.Xie, Z., Hattori, K., Wang, J.Origins of ultramafic rocks in the Sulu ultrahigh pressure terrane, eastern China.Lithos, Vol. 178, pp. 158-170.ChinaUHP
DS201811-2598
2018
Hattori, K.Page, L., Hattori, K., Guillot, S.Mantle wedge serpentinites: a transient reservoir of halogens, boron and nitrogen for the deeper mantle.Geology, Vol. 46, 9, pp. 883-886.Mantlenitrogen

Abstract: Fluorine (50-650 ppm), bromine (0.03-0.3 ppm), iodine (0.03-0.4 ppm), boron (20-100 ppm) and nitrogen (5-45 ppm) concentrations are elevated in antigorite-serpentinites associated with the Tso Morari ultrahigh-pressure unit (Himalayas) exhumed from >100 km depth in the mantle wedge. These fluid-mobile elements are likely released with fluids from subducted marine sediments on the Indian continental margin to hydrate overlying forearc serpentinites at shallow depths. Of these, F and B appear to remain in serpentinites during the lizardite-antigorite transition. Our results demonstrate serpentinites as transient reservoirs of halogens, B, and N to at least 100 km depth in the mantle wedge, and likely deeper in colder slabs, providing a mechanism for their transport to the deeper mantle.
DS201902-0305
2018
Hattori, K.Page, L., Hattori, K.Abyssal serpentinites: transporting halogens from Earth's surface to the deep mantle.MDPI Minerals, 14p. PdfMantlesubduction

Abstract: Serpentinized oceanic mantle lithosphere is considered an important carrier of water and fluid-mobile elements, including halogens, into subduction zones. Seafloor serpentinite compositions indicate Cl, Br and I are sourced from seawater and sedimentary pore fluids, while F may be derived from hydrothermal fluids. Overall, the heavy halogens are expelled from serpentinites during the lizardite-antigorite transition. Fluorine, on the other hand, appears to be retained or may be introduced from dehydrating sediments and/or igneous rocks during early subduction. Mass balance calculations indicate nearly all subducted F is kept in the subducting slab to ultrahigh-pressure conditions. Despite a loss of Cl, Br and I from serpentinites (and other lithologies) during early subduction, up to 15% of these elements are also retained in the deep slab. Based on a conservative estimate for serpentinite thickness of the metamorphosed slab (500 m), antigorite serpentinites comprise 37% of this residual Cl, 56% of Br and 50% of I, therefore making an important contribution to the transport of these elements to the deep mantle.
DS1999-0299
1999
Hattori, K.H.Hattori, K.H., Percival, J.A.Carbonate bearing alkaline magmatism in the Quetico metasedimentary belt, Superior Province, Canada.Geological Association of Canada (GAC) Geological Association of Canada (GAC)/Mineralogical Association of Canada (MAC)., Vol. 24, p. 51. abstractOntarioAlkaline rocks, Magmatism
DS2003-0562
2003
Hattori, K.H.Hattori, K.H., Guillot, S.Volcanic fronts form as a consequence of serpentinite dehydration in the forearc mantleGeology, Vol. 31, 6, June pp. 525-8.MantleBlank
DS200412-0804
2003
Hattori, K.H.Hattori, K.H., Guillot, S.Volcanic fronts form as a consequence of serpentinite dehydration in the forearc mantle wedge.Geology, Vol. 31, 6, June pp. 525-8.MantleSubduction - not specific to diamonds
DS200812-0993
2007
Hattori, K.H.Sader, J.S., Hamilton, S.M., Hattori, K.H., Braundedr, K.Project unit: 07-32. Surface media geochemical sampling at the Victor kimberlite region, northern Ontario and the Kirkland Lake region northeastern Ontario.Ontario Geological Survey Open File, No. 6213, pp. 19-1-6.Canada, OntarioOverview field work
DS201112-0897
2011
Hattori, K.H.Sader, J.A., Hattori, K.H., Kong, J.M., Hamilton, S.M., Brauneder, K.Geochemical responses in peat groundwater over Attawapiskat kimberlites, James Bay Lowlands, Canada and their application to diamond exploration.Geochemistry, Exploration, Environment, Analysis:, Vol. 11, pp. 193-210.Canada, Ontario, James Bay LowlandsGeochemistry
DS2001-0426
2001
Hattoriu, K.H.Guillot, S., Hattoriu, K.H., DeSigoyer, Nagler, AuzendeEvidence of hydration of the mantle wedge and its role in the exhumation of eclogitesEarth and Planetary Science Letters, Vol. 193, No. 2, pp. 115-27.MantleSubduction, Eclogites
DS1993-0639
1993
Hatzl, T.Hatzl, T., Morteani, G.Secondary redistribution of rare earth elements (REE),Barium, Strontium and Manganese in intrusive and extrusive carbonatitesTerra Abstracts, IAGOD International Symposium on mineralization related, Vol. 5, No. 3, abstract supplement p. 21Brazil, TurkeyCarbonatite
DS1988-0330
1988
Haubner, R.Joffreau, P.O., Haubner, R., Lux, B.Low-pressure diamond growth on refractory metalsInternational Journal of Refract. Hard Met, Vol. 7, No. 4 December pp. 186-194GlobalDiamond morphology
DS1992-0069
1992
Hauck, M.Baird, D.J., Nelson, K.D., Walters, J., Hauck, M., Brown, L.D.Deep structure of the Proterozoic Trans-Hudson Orogen beneath the WillistonBasin: results from recent COCORP seismic reflection profilingEos Transactions, Vol. 73, No. 14, April 7, supplement abstracts p. 321SaskatchewanCOCORP -seismic, Williston Basin
DS1992-0683
1992
Hauck, M.L.Hauck, M.L., Baird, D., Brown, L., Nelson, K.D., Walters, J.COCORP deep seismic reflection profiling across the Williston Basin and underlying Trans-Hudson Orogen: acquisition and analysisEos Transactions, Vol. 73, No. 14, April 7, supplement abstracts p. 321SaskatchewanCOCORP -seismic, Williston Basin
DS201804-0701
2018
Hauck, S.A.Huguet, L., Van Oman, J.A., Hauck, S.A., Willard, M.A.Earth's inner core nucleation paradox.Earth and Planteray Science Letters, Vol. 487, pp. 1-17.MantleCore

Abstract: The conventional view of Earth's inner core is that it began to crystallize at Earth's center when the temperature dropped below the melting point of the iron alloy and has grown steadily since that time as the core continued to cool. However, this model neglects the energy barrier to the formation of the first stable crystal nucleus, which is commonly represented in terms of the critical supercooling required to overcome the barrier. Using constraints from experiments, simulations, and theory, we show that spontaneous crystallization in a homogeneous liquid iron alloy at Earth's core pressures requires a critical supercooling of order 1000 K, which is too large to be a plausible mechanism for the origin of Earth's inner core. We consider mechanisms that can lower the nucleation barrier substantially. Each has caveats, yet the inner core exists: this is the nucleation paradox. Heterogeneous nucleation on a solid metallic substrate tends to have a low energy barrier and offers the most straightforward solution to the paradox, but solid metal would probably have to be delivered from the mantle and such events are unlikely to have been common. A delay in nucleation, whether due to a substantial nucleation energy barrier, or late introduction of a low energy substrate, would lead to an initial phase of rapid inner core growth from a supercooled state. Such rapid growth may lead to distinctive crystallization texturing that might be observable seismically. It would also generate a spike in chemical and thermal buoyancy that could affect the geomagnetic field significantly. Solid metal introduced to Earth's center before it reached saturation could also provide a nucleation substrate, if large enough to escape complete dissolution. Inner core growth, in this case, could begin earlier and start more slowly than standard thermal models predict.
DS201012-0068
2010
HauffBouabdellah, M., Hoernle,K., Kchit, A., Duggen, S., Hauff, Klugel, Lowry, BeaudoinPetrogenesis of the Eocene Tamzert continental carbonatites ( central High Atlas, Morocco): implications for a common source for Tamzert and CanaryJournal of Petrology, Vol. 51, 8, pp. 1655-1686.Europe, Canary Islands, MoroccoCarbonatite
DS200912-0189
2009
Hauff, A.Duggen, K.A., Hoernle, F., Hauff, A., Klugel, M., Bouabdellah, Thirwall, M.F.Flow of Canary mantle plume material through a subcontinental lithospheric corridor beneath Africa to the Mediterranean.Geology, Vol. 37, 3, pp. 283-286.EuropePlume
DS2002-0730
2002
Hauff, F.Hoernle, K., Van den Bogaard, P., Werner, R., Lissinaa, B., Hauff, F., AlvaradoMissing history ( 16 -71 Ma) of the Galapagos hotspot: implications for the tectonicGeology, Vol. 30, 9, Sept. pp. 795-98.United StatesTectonics
DS200612-0723
2006
Hauff, F.Kokfelt, T.F., Hoernle, K., Hauff, F., Fiebig, J., Werner, R., Garbe-Schonberg, D.Combined trace element and Pb Nd Sr and O isotope evidence for recycled oceanic crust ( upper and lower) in the Iceland mantle plume.Journal of Petrology, Vol. 47, 9, Sept. pp. 1705-1749.Europe, IcelandGeochronology, subduction
DS200912-0273
2009
Hauff, F.Gurenko, A.A., Sobolev, A.V., Hoernle, K.A., Hauff, F., Schincka, H-U.Enriched, HIMU type peridotite and depleted recycled pyroxenite in the Canary plume: a mixed up mantle.Earth and Planetary Science Letters, Vol. 277, 3-4, Jan. 30, pp. 514-524.Europe, Canary IslandsGeothermometry - subduction
DS201112-0405
2011
Hauff, F.Halama, R., Timm, J., Herms, P., Hauff, F., Schenk, V.A stable ( Li,O) and radiogenic (Sr, Nd) isotope perspective on metasomatic processes in a subducting slab.Chemical Geology, Vol. 281, 3-4, pp. 151-166.MantleSubduction
DS202004-0521
2020
Hauff, F.Jung, S., Hauff, F., Berndt, J.Generation of a potassic to ultrapotassic alkaline complex in a syn-collisional setting through flat subduction: constraints on magma sources and processes ( Otjimingwe alkaline complex, Damara orogen, Namibia).Gondwana Research, Vol. 82, pp. 267-287.Africa, Namibiametasomatism

Abstract: The ~545 Ma-old syn-collisional Otjimbingwe alkaline complex is composed of pyroxene-amphibole-biotite-bearing, mildly nepheline-normative to quartz-normative rocks ranging in composition from monzogabbro to monzonite, syenite and granite. The alkaline rocks have moderate to high SiO2 (50.5-73.0 wt%) and Na2O + K2O (5.1-11.5 wt%) and moderate to low MgO (6.6-0.2 wt%) concentrations. All samples have high large ion lithophile element (LILE: Ba up to 4600 ppm) and high-field-strength element contents (HFSE; Zr: 155-1328 ppm; Nb: 16-110 ppm; Ta: 1.4-7.1 ppm and Hf: 4-24 ppm) and have strongly fractionated LREE patterns ((La/Yb)N = 14-51). The most primitive members lack significant negative Eu anomalies. Mantle-normalized multi-element diagrams show depletion in Ba, Rb, Nb (Ta), P and Ti. The alkaline rocks have moderate radiogenic initial 87Sr/86Sr ratios (0.7061-0.7087) and unradiogenic initial ?Nd values (?3.9 to ?6.1). This isotope signature, associated with high LREE/HFSE ratios indicates that the parental melts were generated in enriched portions of the shallow lithospheric mantle, which was probably affected by previous subduction zone processes. In addition, correlations between Sr and Nd isotopes indicate that some of these variations result from combined crustal assimilation and fractional crystallization (AFC) processes. A new model of flat subduction is presented that explains most of the unsolved problems in the orogenic evolution of the Damara orogen, namely (i) the absence of early intrusive rocks with a clear subduction zone setting, (ii) the absence of high-pressure rocks such as blueschists and eclogites, (iii) the unusual distribution of igneous rocks with a clear predominance of granite and granodiorite and (iv) the need for a asthenospheric window during a classical subduction to explain the high T/moderate P granulite facies conditions in the overriding plate.
DS202007-1153
2020
Hauff, F.Jung, S., Hauff, F., Berndt, J.Generation of a potassic to ultrapotassic alkaline complex in a syn-collisional setting through flat subduction: constraints on magma sources and processes ( Otjimingwe alkaline complex, Damara orogen, Namibia.Gondwana Research, Vol. 82, pp. 267-287. pdfAfrica, Namibiadeposit - Otjimbingwe

Abstract: The ~545 Ma-old syn-collisional Otjimbingwe alkaline complex is composed of pyroxene-amphibole-biotite-bearing, mildly nepheline-normative to quartz-normative rocks ranging in composition from monzogabbro to monzonite, syenite and granite. The alkaline rocks have moderate to high SiO2 (50.5-73.0 wt%) and Na2O + K2O (5.1-11.5 wt%) and moderate to low MgO (6.6-0.2 wt%) concentrations. All samples have high large ion lithophile element (LILE: Ba up to 4600 ppm) and high-field-strength element contents (HFSE; Zr: 155-1328 ppm; Nb: 16-110 ppm; Ta: 1.4-7.1 ppm and Hf: 4-24 ppm) and have strongly fractionated LREE patterns ((La/Yb)N = 14-51). The most primitive members lack significant negative Eu anomalies. Mantle-normalized multi-element diagrams show depletion in Ba, Rb, Nb (Ta), P and Ti. The alkaline rocks have moderate radiogenic initial 87Sr/86Sr ratios (0.7061-0.7087) and unradiogenic initial ?Nd values (?3.9 to ?6.1). This isotope signature, associated with high LREE/HFSE ratios indicates that the parental melts were generated in enriched portions of the shallow lithospheric mantle, which was probably affected by previous subduction zone processes. In addition, correlations between Sr and Nd isotopes indicate that some of these variations result from combined crustal assimilation and fractional crystallization (AFC) processes. A new model of flat subduction is presented that explains most of the unsolved problems in the orogenic evolution of the Damara orogen, namely (i) the absence of early intrusive rocks with a clear subduction zone setting, (ii) the absence of high-pressure rocks such as blueschists and eclogites, (iii) the unusual distribution of igneous rocks with a clear predominance of granite and granodiorite and (iv) the need for a asthenospheric window during a classical subduction to explain the high T/moderate P granulite facies conditions in the overriding plate. Graphical abstract
DS201806-1227
2018
Hauff, J.Homrighausen, S., Hoernle, K., Hauff, J., Geldmacher, J., Garbe-Schonberg, D.Global distribution of the HIMU end member: formation through Archean plume lid tectonics.Earth Science Reviews, Vol. 182, pp. 85-101.Globaltectonics

Abstract: Oceanic basalts reflect the heterogeneities in the earth's mantle, which can be explained by five mantle end members. The HIMU end member, characterized by high time-integrated ? (238U/204Pb), is defined by the composition of lavas from the ocean islands of St. Helena, South Atlantic Ocean and Mangaia and Tubuai (Cook-Austral Islands), South Pacific Ocean. It is widely considered to be derived from a mantle reservoir that is rarely sampled and not generally involved in mixing with the other mantle components. On the other hand, the FOZO end member, located at the FOcal ZOne of oceanic volcanic rock arrays on isotope diagrams, is considered to be a widespread common component with slightly less radiogenic 206Pb/204Pb and intermediate Sr-Nd-Hf isotopic compositions. Here we present new major and trace element, Sr-Nd-Pb-Hf isotope and geochronological data from the Walvis Ridge and Richardson Seamount in the South Atlantic Ocean and the Manihiki Plateau and Eastern Chatham Rise in the southwest Pacific Ocean. Our new data, combined with literature data, document a more widespread (nearly global) distribution of the HIMU end member than previously postulated. Our survey shows that HIMU is generally associated with low-volume alkaline, carbonatitic and/or kimberlitic intraplate volcanism, consistent with derivation from low degrees of melting of CO2-rich sources. The majority of end member HIMU locations can be directly related to hotspot settings. The restricted trace element and isotopic composition (St. Helena type HIMU), but near-global distribution, point to a deep-seated, widespread reservoir, which most likely formed in the Archean. In this context we re-evaluate the origin of a widespread HIMU reservoir in an Archean geodynamic setting. We point out that the classic ocean crust recycling model cannot be applied in a plume-lid dominated tectonic setting, and instead propose that delamination of carbonatite-metasomatized subcontinental lithospheric mantle could be a suitable HIMU source.
DS2002-0677
2002
Hauff, P.L.Hauff, P.L., Coulter, D., Koll, G., Peters, D.C., Peppin, W.A.An overview of hyper spectral remote sensing as applied to precious metals and diamond deposits.11th. Quadrennial Iagod Symposium And Geocongress 2002 Held Windhoek, Abstract p. 27.GlobalRemote sensing - hyperspectral
DS201903-0542
2019
Haug, O.T.Schmiedel, T., Gailland, O., Haug, O.T., Dumazer, G., Breikreuz, C.Coulomb failure of Earth's brittle crust controls growth, emplacement and shapes of igneous sills, saucer-shaped sills and laccoliths.Earth and Planetary Science Letters, Vol. 510, pp. 161-172.MantleMagmatism

Abstract: Tabular intrusions are common features in the Earth's brittle crust. They exhibit a broad variety of shapes, ranging from thin sheet intrusions (sills, saucer-shaped sills, cone sheets), to more massive intrusions (domed and punched laccoliths, stocks). Such a diversity of intrusion shapes reflects different emplacement mechanisms caused by contrasting host rock and magma rheologies. Most current models of tabular intrusion emplacement assume that the host rock behaves purely elastically, whereas numerous observations show that shear failure plays a major role. In this study, we investigate the effects of the host rock's Coulomb properties on magma emplacement by integrating (1) laboratory models using dry Coulomb granular model hosts of variable strength (cohesion) and (2) limit analysis numerical models. Our results show that both sheet and massive tabular intrusions initiate as a sill, which triggers shear failure of its overburden along an inclined shear damage zone at a critical sill radius, which depends on the emplacement depth and the overburden's cohesion. Two scenarios are then possible: (1) if the cohesion of the overburden is significant, opening of a planar fracture along the precursory weakened shear damage zones to accommodate magma flow, leads to the formation of inclined sheets, or (2) if the cohesion of the overburden is negligible, the sill inflates and lifts up the overburden, which is dissected by several faults that control the growth of a massive intrusion. Finally, we derive a theoretical scaling that predicts the thickness-to-radius aspect ratios of the laboratory sheet intrusions. This theoretical prediction shows how sheet intrusion morphologies are controlled by a mechanical equilibrium between the flowing viscous magma and Coulomb shear failure of the overburden. Our study suggests that the emplacement of sheet and massive tabular intrusions are parts of the same mechanical regime, in which the Coulomb behavior of the Earth's brittle crust plays an essential role.
DS202110-1618
2021
Haugaard, R.Haugaard, R., Waterton, P., ootes, L., Pearson, D.G., Luo,Y., Konhauser, K.Detrital chromites reveal Slave craton's missing komatite.Geology, Vol. 49, 9, pp. 1079-1083. pdfCanada, Northwest Territorieschromites

Abstract: Komatiitic magmatism is a characteristic feature of Archean cratons, diagnostic of the addition of juvenile crust, and a clue to the thermal evolution of early Earth lithosphere. The Slave craton in northwest Canada contains >20 greenstone belts but no identified komatiite. The reason for this dearth of komatiite, when compared to other Archean cratons, remains enigmatic. The Central Slave Cover Group (ca. 2.85 Ga) includes fuchsitic quartzite with relict detrital chromite grains in heavy-mineral laminations. Major and platinum group element systematics indicate that the chromites were derived from Al-undepleted komatiitic dunites. The chromites have low 187Os/188Os ratios relative to chondrite with a narrow range of rhenium depletion ages at 3.19 ± 0.12 Ga. While these ages overlap a documented crust formation event, they identify an unrecognized addition of juvenile crust that is not preserved in the bedrock exposures or the zircon isotopic data. The documentation of komatiitic magmatism via detrital chromites indicates a region of thin lithospheric mantle at ca. 3.2 Ga, either within or at the edge of the protocratonic nucleus. This study demonstrates the applicability of detrital chromites in provenance studies, augmenting the record supplied by detrital zircons.
DS1920-0337
1927
Haughton, S.H.Haughton, S.H.Notes on the River System of Southwest GordoniaRoyal Society. STH. AFR. Transactions, Vol. 14, PT. 3, PP. 226-231.South AfricaGeomorphology
DS1920-0385
1928
Haughton, S.H.Haughton, S.H.The Palaeontology of the Namaqualand Coastal DepositsGeological Society of South Africa Transactions, APPENDIX, Vol. 31, PP. 35-41.Southwest Africa, Namibia, South AfricaLittoral Diamond Placers
DS1920-0465
1929
Haughton, S.H.Rogers, A.W., Hall, A.L., Wagner, P.A., Haughton, S.H.The Union of South AfricaHeidelberg: C. Winters Universitaetsbuchhandlung, 232P.South AfricaRegional Geology, Kimberley
DS1930-0025
1930
Haughton, S.H.Haughton, S.H.On the Occurrence of Upper Cretaceous Marine Fossils Near Bogenfels, Southwest Africa.Royal Society. STH. AFR. Transactions, Vol. 18, PP. 361-365.Southwest Africa, NamibiaPalaeontology
DS1930-0026
1930
Haughton, S.H.Haughton, S.H.Note on the Occurrence of Upper Cretaceous Marine Beds in South West Africa.Geological Society of South Africa Transactions, VOL 33, PP. 61-63.Southwest Africa, NamibiaStratigraphy
DS1930-0061
1931
Haughton, S.H.Haughton, S.H.On a Collection of Fossil Frogs from the Clays at BankeRoyal Society. STH. AFR. Transactions, Vol. 19, PP. 233-249.South AfricaPaleontology, Stratigraphy
DS1930-0062
1931
Haughton, S.H.Haughton, S.H.The Late Tertiary and Recent Deposits of the West Coast of South Africa.Geological Society of South Africa Transactions, Vol. 34, PP. 19-58.Southwest Africa, NamibiaLittoral Diamond Placers, Geology, South Africa
DS1950-0175
1954
Haughton, S.H.Dutoit, A.L., Haughton, S.H.The Geology of South Africa (1954)Edinburgh: Oliver And Boyd., 611P. 3RD. EDITION.South AfricaKimberlite, Kimberley, Janlib, Geology
DS1960-0459
1964
Haughton, S.H.Haughton, S.H.The Geology of Some Ore Deposits in South Africa. Deposits Of Some Minerals Outside of the Witwatersrand Basin.Johannesburg: Geological Society of South Africa, Vol. 2, 739P.South Africa, Zimbabwe, Southwest Africa, NamibiaKimberley, Alluvial Diamond Placers
DS2001-0445
2001
Hauksson, E.Hardebeck, J.L., Hauksson, E.Crustal stress field in southern California and its implications for fault mechanicsJournal of Geophysical Research, Vol. 106, No. 10, pp.21,859-82.MantleTectonics, seismics, stress
DS1940-0177
1948
Haun, J.D.Haun, J.D.Geologic Map of a Portion of the East Flank of the Laramie Range, Platte and Laramie Counties.Msc. Thesis, University Wyoming, United States, Wyoming, Rocky MountainsRegional Studies
DS201012-0394
2009
HauriKlein-BenDavid, O., Logvinova, A.M., Schrauder, M., Spetius, Z.V., Weiss, Hauri, Kaminsky, Sobolev, Navon, O.High Mg carbonatitic Micro inclusions in some Yakutian diamonds - a new type of diamond forming fluid.Lithos, Vol. 112 S pp. 648-659.RussiaMineral chemistry - end member
DS1994-0736
1994
Hauri, E.Hauri, E.Extremely depleted peridotite xenoliths from Islands of the Samoa and Macdonald hotspots, Pacific Ocean.Eos, Vol. 75, No. 16, April 19, p. 191.GlobalXenoliths, Mantle plumes
DS1996-0613
1996
Hauri, E.Hauri, E.Migration of magma from convecting magmaCarnegie Institute Yearbook 94, (1994-1995), pp. 116-128MantlePlate Tectonics, Mantle Plumes
DS1998-0994
1998
Hauri, E.Menzies, A.H., Gurney, J.J., Harte, B., Hauri, E.rare earth elements (REE) patterns in diamond bearing eclogites and diamond bearing peridotites from Newlands kimberlite.7th International Kimberlite Conference Abstract, pp. 573-5.South AfricaEclogites, peridotites, Deposit - Newlands
DS2001-1232
2001
Hauri, E.Westerlund, K., Gurney, J.J., Shirey, S.B., Hauri, E.Nitrogen aggregation and stable nitrogen and carbon isotope characteristics of diamonds from Panda.Slave-Kaapvaal Workshop, Sept. Ottawa, 4p. abstractNorthwest TerritoriesGeochronology, Deposit - Panda
DS2002-0678
2002
Hauri, E.Hauri, E., Bulanova, G., Pearson, G., Griffin, B.Carbon and nitrogen isotope systematics in a sector zoned diamond from the Mir kimberlite, Yakutia.Eos, American Geophysical Union, Spring Abstract Volume, Vol.83,19, 1p.Russia, YakutiaGeochronology - diamond morphology, Deposit - Mir
DS2003-0733
2003
Hauri, E.Koch-Muller, M., Dera, M., Fei, Y., Reno, B., Sobolev, N., Hauri, E.OH in synthetic and natural coesiteAmerican Mineralogist, Vol. 88, 10, Oct. pp. 1436-45.GlobalMineralogy - coesite
DS200412-1024
2003
Hauri, E.Koch-Muller, M., Dera, M., Fei, Y., Reno, B., Sobolev, N., Hauri, E., Wysoczanski, R.OH in synthetic and natural coesite.American Mineralogist, Vol. 88, 10, Oct. pp. 1436-45.TechnologyMineralogy - coesite
DS200512-0543
2004
Hauri, E.Klein Ben David, O., Israeli, E.S., Wirth, R., Hauri, E., Navon, O.Brine and carbonatitic melts in a diamond from Diavik - implications for mantle fluid evolution.Israel Geological Society, p. 60. 1p. Ingenta 1045591104Canada, Northwest TerritoriesDiamond inclusions
DS200612-0679
2006
Hauri, E.Kelley, K.A., Plank, T., Grove, T.L., Stolper,E.M., Newman, S., Hauri, E.Mantle melting as a function of water content beneath back arc basins.Journal of Geophysical Research, Vol. 111, B9, B09208.MantleSubduction zone magmatism
DS200712-0523
2006
Hauri, E.Kelley, K.A., Plank, T., Grove, T.L., Stolper, E.M., Newman, S., Hauri, E.Mantle melting as a function of water content beneath back arc basins.Journal of Geophysical Research, Vol. 111, B9, B09208.MantleMelting
DS200712-0524
2006
Hauri, E.Kelley, K.A., Plank, T., Grove, T.L., Stolper, E.M., Newman, S., Hauri, E.Mantle melting as a function of water content beneath back arc basins.Journal of Geophysical Research, Vol. 111, B9, B09208.MantleWater
DS200712-0551
2007
Hauri, E.Klein, Ben David, O., Izraeli, E.S., Hauri, E., Navon, O.Fluid inclusions in diamonds from the Diavik mine, Canada and the evolution of diamond forming fluids.Geochimica et Cosmochimica Acta, Vol. 71, 3, pp. 723-744.Canada, Northwest TerritoriesDiavik - diamond inclusions, geochemistry
DS201412-0258
2014
Hauri, E.Gaetani, G., O'Leary, J., Koga, K., Hauri, E., Rose-Koga, E., Monteleone, B.Hydration of mantle olivine under variable water and oxygen fugacity conditions.Contributions to Mineralogy and Petrology, Vol. 167, 2, pp. 1-14.MantleOlivine
DS201412-0816
2014
Hauri, E.Shiry, S., Hauri, E., Thomson, A., Bulanova, G., Smith, C., Kohn, S., Walter, M.Water content of stishovite, majorite and perovskite inclusions in Juin a superdeep diamonds.Goldschmidt Conference 2014, 1p. AbstractSouth America, BrazilDeposit - Juina
DS201907-1527
2019
Hauri, E.Batanova, V.G., Thompson, J.M., Danyushevsky, L.V., Portnyagin, M.V., Garbe-Schonberg, D., Hauri, E., Kimura, J-I., Chang, Q., Senda, R., Goemann, K., Chauvel, C., Campillo, S., Ionov, D.A., Sobolev,A.V.New olivine reference material for in situ microanalysis.Geostandards and Geoanalytical Research, in press available, 21p.Asia, Mongoliaolivine

Abstract: A new olivine reference material - MongOL Sh11?2 - for in situ analysis has been prepared from the central portion of a large (20 × 20 × 10 cm) mantle peridotite xenolith from a ~ 0.5 My old basaltic breccia at Shavaryn?Tsaram, Tariat region, central Mongolia. The xenolith is a fertile mantle lherzolite with minimal signs of alteration. Approximately 10 g of 0.5-2 mm gem quality olivine fragments were separated under binocular microscope and analysed by EPMA, LA?ICP?MS, SIMS and bulk analytical methods (ID?ICP?MS for Mg and Fe, XRF, ICP?MS) for major, minor and trace elements at six institutions world?wide. The results show that the olivine fragments are sufficiently homogeneous with respect to major (Mg, Fe, Si), minor and trace elements. Significant inhomogeneity was revealed only for phosphorus (homogeneity index of 12.4), whereas Li, Na, Al, Sc, Ti and Cr show minor inhomogeneity (homogeneity index of 1-2). The presence of some mineral and fluid?melt micro?inclusions may be responsible for the inconsistency in mass fractions obtained by in situ and bulk analytical methods for Al, Cu, Sr, Zr, Ga, Dy and Ho. Here we report reference and information values for twenty?seven major, minor and trace elements.
DS202007-1166
2020
Hauri, E.Newcombe, M.E., Plank, T., Barth, A., Asimov, P.D., Hauri, E.Water in olivine magma ascent chronology: every crystal is a clock.Journal of Volcanology and Geothermal Research, Vol. 398, 106872 17p. PdfUnited States, Hawaiimelting

Abstract: The syneruptive decompression rate of basaltic magma in volcanic conduits is thought to be a critical control on eruptive vigor. Recent efforts have constrained decompression rates using models of diffusive water loss from melt embayments (Lloyd et al. 2014; Ferguson et al. 2016), olivine-hosted melt inclusions (Chen et al. 2013; Le Voyer et al. 2014), and clinopyroxene phenocrysts (Lloyd et al. 2016). However, these techniques are difficult to apply because of the rarity of melt embayments and clinopyroxene phenocrysts suitable for analysis and the complexities associated with modeling water loss from melt inclusions. We are developing a new magma ascent chronometer based on syneruptive diffusive water loss from olivine phenocrysts. We have found water zonation in every olivine phenocryst we have measured, from explosive eruptions of Pavlof, Seguam, Fuego, Cerro Negro and Kilauea volcanoes. Phenocrysts were polished to expose a central plane normal to the crystallographic `b' axis and volatile concentration profiles were measured along `a' and `c' axes by SIMS or nanoSIMS. Profiles are compared to 1D and 3D finite-element models of diffusive water loss from olivine, with or without melt inclusions, whose boundaries are in equilibrium with a melt undergoing closed-system degassing. In every case, we observe faster water diffusion along the `a' axis, consistent with the diffusion anisotropy observed by Kohlstedt and Mackwell (1998) for the so-called `proton-polaron' mechanism of H-transport. Water concentration gradients along `a' match the 1D diffusion model with a diffusivity of 10-10 m2/s (see Plank et al., this meeting), olivine-melt partition coefficient of 0.0007­-0.002 (based on melt inclusion-olivine pairs), and decompression rates equal to the best-fit values from melt embayment studies (Lloyd et al. 2014; Ferguson et al. 2016). Agreement between the melt embayment and water-in-olivine ascent chronometers at Fuego, Seguam, and Kilauea Iki demonstrates the potential of this new technique, which can be applied to any olivine-bearing mafic-intermediate eruption using common analytical tools (SIMS and FTIR). In theory, each crystal is a clock, with the potential to record variable ascent in the conduit, over the course of an eruption, and between eruptions.
DS2003-1269
2003
Hauri, E..Shiryaev, A., Izraeli, E.S., Hauri, E.., Galimov, E.M., Navon, O.Fluid inclusions in Brazilian coated diamonds8ikc, Www.venuewest.com/8ikc/program.htm, Session 3, POSTER abstractBrazilDiamonds - inclusions
DS1993-0640
1993
Hauri, E.H.Hauri, E.H., Shimizu, N., Dieu, J.J., Hart, S.R.Evidence for hotspot related carbonatite metasomatism in the oceanic uppermantle.Nature, Vol. 365, No. 6443, Sept. 16, pp. 221-227.MantleCarbonatite, Hotspot
DS1997-0487
1997
Hauri, E.H.Hauri, E.H.Melt migration and mantle chromatography: 1. simplified theory - conditions for chemical and isotopic couplingEarth and Plan. Sci. Letters, Vol. 153, No. 1-2, pp. 1-19.MantleMelts, Geochronology
DS1998-0596
1998
Hauri, E.H.Hauri, E.H., Pearson, D.G., Bulanova, G.P., Milledge, H.Microscale variations in Carbon and Nitrogen isotopes within mantle diamonds revealed by SIMS.7th International Kimberlite Conference Abstract, pp. 317-9.Russia, Siberia, southern AfricaDiamond morphology, Geochronology
DS1998-1237
1998
Hauri, E.H.Righter, K., Hauri, E.H.Compatibility of rhenium in garnet during mantle melting and magmagenesis.Science, Vol. 280, No. 5370, June 12, pp. 1737-40.MantleMagma, Melting
DS2002-0098
2002
Hauri, E.H.Ballentine, C.J., Van Keken, P.E., Porcelli, D., Hauri, E.H.Numerical models, geochemistry and the zero-paradox noble gas mantlePhilosophical Transactions, Royal Society of London Series A Mathematical, Vol.1800, pp. 2611-32.MantleGeochemistry - model
DS2002-0221
2002
Hauri, E.H.Bulanova, G.P., Pearson, D.G., Hauri, E.H., Griffin, B.J.Carbon and nitrogen isotope systematics within a sector growth diamond from the Mir kimberlite, Yakutia.Chemical Geology, Vol. 188, No. 1-2, pp. 105-123.Russia, YakutiaGeochronology, Deposit - Mir
DS2002-0679
2002
Hauri, E.H.Hauri, E.H.Osmium isotopes and mantle convectionPhilosophical Transactions, Royal Society of London Series A Mathematical, Vol.1800, pp. 2371-2382.MantleGeochronology, geochemistry
DS2002-0680
2002
Hauri, E.H.Hauri, E.H., Kent, A.J., Arndt, N.Melt inclusions at the milennium: toward a deeper understanding of magmatic processes.Chemical Geology, Vol.183, 1-4, pp. 1-3.MantleMagmatism
DS2002-0681
2002
Hauri, E.H.Hauri, E.H., Wang, J., Pearson, D.G., Bulanova, G.P.Microanalysis of 13C 15 N and N abundances in diamonds by secondary ion mass spectrometry.Chemical Geology, Vol.145, 1-2, Apr.15, pp. 149-63.Russia, SiberiaDiamond - inclusions, carbon, nitrogen isotopes
DS2002-1437
2002
Hauri, E.H.Seal, A.E., Hauri, E.H.Vapour undersaturation in primitive Mid-Ocean ridge basalt and the volatile content of Earth's upper mantle.Nature, Oct. 3, pp. 451-55.MantleGeochemistry
DS2002-1645
2002
Hauri, E.H.Van Keken, P.E., Hauri, E.H., Ballentine, C.J.Mantle mixing: the generation, preservation and destruction of chemical heterogeneityAnnual Review of Earth and Planetary Sciences, Vol.30,pp. 493-525.mantleGeochemistry
DS2002-1646
2002
Hauri, E.H.Van Keken, P.E., Hauri, E.H., Ballentine, C.J.Mantle mixing: the generation, preservation and destruction of chemical heterogeneityAnnual Review of Earth and Planetary Sciences, Vol.30,pp. 493-525.mantleGeochemistry
DS2003-0026
2003
Hauri, E.H.Araujo, D.P., Gaspar, J.C., Fei, Y., Hauri, E.H., Hemley, R., Bulanova, G.P.Mineralogy of diamonds from the Juin a Province, Brazil8ikc, Www.venuewest.com/8ikc/program.htm, Session 3, POSTER abstractBrazilDiamonds
DS2003-0183
2003
Hauri, E.H.Bulanova, G.P., Pearson, D.G., Hauri, E.H., Milledge, H.J., Barashkov, Yu.P.Dynamics of diamond growth: evidence from isotope and FTIR trends8ikc, Www.venuewest.com/8ikc/program.htm, Session 3, POSTER abstractRussiaDiamonds - inclusions, Geochronology, morphology
DS2003-1414
2003
Hauri, E.H.Van Orman, J.A., Fei, Y., Hauri, E.H., Wang, J.Diffusion in MgO at high pressures: constraints on deformation mechanisms andGeophysical Research Letters, Vol. 30, 2, Jan. 15. p. 28.MantleGeochemistry
DS2003-1469
2003
Hauri, E.H.Westerlund, K.J., Hauri, E.H., Gurney, J.J.FTIR absorption and stable nitrogen and carbon isotope microanalysis of mid Archean8ikc, Www.venuewest.com/8ikc/program.htm, Session 3, POSTER abstractNorthwest TerritoriesDiamonds - inclusions, Deposit - Panda
DS200412-2041
2003
Hauri, E.H.Van Orman, J.A., Fei, Y., Hauri, E.H., Wang, J.Diffusion in MgO at high pressures: constraints on deformation mechanisms and chemical transport at the core mantle boundary.Geophysical Research Letters, Vol. 30, 2, Jan. 15. p. 28.MantleGeochemistry
DS200412-2104
2004
Hauri, E.H.Westerlund, K.J., Gurney, J.J., Carlson, R.W., Shirey, S.B., Hauri, E.H., Richardson, S.H.A metasomatic origin for late Archean eclogitic diamonds: implications from internal morphology of diamonds and Re Os and S isotSouth African Journal of Geology, Vol. 107, 1/2, pp. 119-130.Africa, South AfricaDeposit - Klipspringer, Jurassic, sulfide inclusions
DS200612-0495
2006
Hauri, E.H.Green, T.H., Hauri, E.H., Gaetani, G.A., Adam, J.New calculations on water storage in the upper mantle, and implications for mantle melting models.Geochimica et Cosmochimica Acta, Vol. 70, 18, 1, p. 215, abstract only.MantleWater
DS200612-0548
2006
Hauri, E.H.Hauri, E.H., Gaetani, G.A., Green, T.H.Partitioning of water during melting of the Earth's upper mantle at H2O undersaturated conditions.Earth and Planetary Science Letters, Vol. 248, 3-4, Aug. 30, pp. 715-734.MantleMelting
DS200612-1286
2005
Hauri, E.H.Shiryaev, A.A., Izraeli, E.S., Hauri, E.H., Zakharchenko, O.D., Navon, O.Chemical optical and isotopic investigation of fibrous diamonds from Brazil.Russian Geology and Geophysics, Vol. 46, 12, pp. 1185-1201.South America, BrazilDiamond morphology
DS200712-0422
2007
Hauri, E.H.Hauri, E.H., Brandenburg, J.P., Van Keken, P.E.What comes around goes around: mantle convection and the meaning of mantle isochrons.Plates, Plumes, and Paradigms, 1p. abstract p. A385.MantleGeochronology
DS201212-0641
2012
Hauri, E.H.Shaw, A.M., Hauri, E.H., Behn, M.D., Hilton, D.R., MacPherson, C.G., Sinton, J.M.Long term preservation of slab signatures in the mantle interred from hydrogen isotopes.Nature Geoscience, Vol. 5, March pp, 224-228.MantleTomography - seismics
DS201312-0117
2013
Hauri, E.H.Cabral, R.A., Jackson, M.A., Rose-Kaga, E.F., Koga, K.T., Whitehouse, MJ., Antonelli, M.A., Farquhar, J., Day, J.M.D., Hauri, E.H.Anomalous sulphur isotopes in plume lavas reveal deep mantle storage of Archean crust.Nature, Vol. 496, April 25, pp. 490-493.Mantle, Cook IslandsSubduction
DS201312-0817
2013
Hauri, E.H.Shirey, S.B., Hauri, E.H., Thomason, A.R., Bulanova, G.P., Smith, C.B., Kohn, S.C., Walter, M.J.Water content of inclusions in superdeep diamonds.Goldschmidt 2013, 1p. AbstractSouth America, BrazilDeposit - Collier4
DS201312-0980
2013
Hauri, E.H.Wng, J., Shirey, S.B., Hauri, E.H.Simultaneous measurements of C and N isotopic composition and N abundance in diamonds by NanoSIMS.Goldschmidt 2013, 1p. AbstractAfrica, Guinea, ChinaGeochronology
DS201412-0640
2014
Hauri, E.H.Novella, D., Frost, D.J., Hauri, E.H., Bureau, H., Raepsaet, C., Roberge, M.The distribution of H2O between silicate melt and nominally anhydrous peridotite and the onset of hydrous melting in the deep upper mantle.Earth and Planetary Science Letters, Vol. 400, pp. 1-13.MantleMelting
DS201603-0368
2015
Hauri, E.H.Chang, Y-Y., Jacobsen, S.D., Bina, C.R., Thomas, S-M., Smyth, J.R., Frost, D.J., Boffa Ballaran, T., McCammon, C.A., Hauri, E.H., Inoue, T., Yurimoto, H., Meng, Y., Dera, P.Comparative compressibility of hydrous wadsleyite and ringwoodite: effect of H2O and implications for detecting water in the transition zone.Journal of Geophysical Research,, Vol. 120, 12, pp. 8259-8280.MantleRingwoodite

Abstract: Review of recent mineral physics literature shows consistent trends for the influence of Fe and H2O on the bulk modulus (K0) of wadsleyite and ringwoodite, the major phases of Earth's mantle transition zone (410-660?km). However, there is little consensus on the first pressure derivative, K0??=?(dK/dP)P=0, which ranges from about 4 to >5 across experimental studies and compositions. Here we demonstrate the importance of K0? in evaluating the bulk sound velocity of the transition zone in terms of water content and provide new constraints on the effect of H2O on K0? for wadsleyite and ringwoodite by conducting a comparative compressibility study. In the experiment, multiple crystals of hydrous Fo90 wadsleyite containing 2.0 and 0.25?wt?% H2O were loaded into the same diamond anvil cell, along with hydrous ringwoodite containing 1.4?wt?% H2O. By measuring their pressure-volume evolution simultaneously up to 32?GPa, we constrain the difference in K0? independent of the pressure scale, finding that H2O has no effect on K0?, whereas the effect of H2O on K0 is significant. The fitted K0? values of hydrous wadsleyite (0.25 and 2.0?wt?% H2O) and hydrous ringwoodite (1.4?wt?% H2O) examined in this study were found to be identical within uncertainty, with K0? ~3.7(2). New secondary-ion mass spectrometry measurements of the H2O content of these and previously investigated wadsleyite samples shows the bulk modulus of wadsleyite is reduced by 7.0(5)?GPa/wt?% H2O, independent of Fe content for upper mantle compositions. Because K0? is unaffected by H2O, the reduction of bulk sound velocity in very hydrous regions of transition zone is expected to be on the order of 1.6%, which is potentially detectible in high-resolution, regional seismology studies.
DS201605-0808
2016
Hauri, E.H.Adam, J., Turner, M., Hauri, E.H., Turner, S.Crystal/melt partitioning of water and other volatiles during the near-solidus melting of mantle peridotite: comparisons with non-volatile incompatible elements and implications for the generation of intraplate magmatism.American Mineralogist, Vol. 101, pp. 876-888.MantleMagmatism - basanite, melting

Abstract: Concentrations of H2O, F, Cl, C, P, and S have been measured by secondary ion mass spectrometry (SIMS) in experimentally produced peridotite phases (including clinopyroxene, orthopyroxene, olivine, garnet, amphibole, and mica) and coexisting basanitic glasses. Because only two experiments produced glasses on quenching (with the melt phase in others reverting to felt-like crystallite masses) H2O concentrations in melts were also separately determined from mass-balance relationships and by assuming constant H2O/La in melts and starting materials. The resulting values were used to calculate mineral/melt partition coefficients (D values) for H2O [where DH2Ocrystal/melt = (mass fraction of H2O in crystal)/(mass fraction of H2O in melt)] for conditions of 1025-1190 °C and 1.0-3.5 GPa. These gave 0.0064-0.0164 for clinopyroxene, 0.0046-0.0142 for orthopyroxene, 0.0015-0.0016 for olivine, and 0.0016-0.0022 for garnet. Although less information was obtained for the other volatiles, F was found to be significantly more compatible than H2O during peridotite melting, whereas Cl is significantly less compatible. S also has small but appreciable solubilities in amphiboles and micas, but not in pyroxenes or olivine. The solubility of C in silicate minerals appears to be negligible, although C was present in coexisting melts (~0.5 wt% as CO2) and as residual graphite during experiments. The D values for H2O in clinopyroxene and orthopyroxene are positively correlated with ivAl but negatively correlated with the H2O concentrations of melts (when considered as wt%). These relationships are consistent with the broad trends of previously published partitioning data. Although some of the concentration dependence can be related to cross-correlation between ivAl in pyroxenes and H2O concentrations in melts (via the latter’s control of liquidus temperatures) this relationship is too inconsistent to be a complete explanation. A concentration dependence for DH2Omineral/melt can also be independently predicted from speciation models for H2O in silicate melts. Thus it is likely that DH2Opyx/melt is influenced by both ivAl and the absolute concentration of H2O in melts. DH2O/DCe for clinopyroxene is inversely correlated with M2 site radii. Because the latter decrease with increasing pressure and temperature, relatively hot and/or deeply derived melts should be enriched in Ce relative to H2O when compared to melts from cooler and shallower mantle sources. Conversely, melts from H2O-rich settings (e.g., subduction zones) should have higher H2O/Ce than their source rocks. When combined with previously obtained partitioning data for non-volatile elements (from the same experiments), our data are consistent with the enrichment of intraplate basalt sources in both volatile and non-volatile incompatible elements by small-degree melts derived from local mid-ocean ridge basalt sources. In this way, volatiles can be seen to play an active role (via their promotion of partial-melting and metasomatic processes) in the auto-regulation of incompatible element concentrations in the depleted upper mantle.
DS201704-0645
2017
Hauri, E.H.Sarafian, E., Gaetani, G.A., Hauri, E.H., Sarafian, A.R.Experimental constraints on the damp peridotite solidus and oceanic mantle potential temperature.Science, Vol. 355, 6328, pp. 942-945.MantleGeothermometry

Abstract: Decompression of hot mantle rock upwelling beneath oceanic spreading centers causes it to exceed the melting point (solidus), producing magmas that ascend to form basaltic crust ~6 to 7 kilometers thick. The oceanic upper mantle contains ~50 to 200 micrograms per gram of water (H2O) dissolved in nominally anhydrous minerals, which -relative to its low concentration-has a disproportionate effect on the solidus that has not been quantified experimentally. Here, we present results from an experimental determination of the peridotite solidus containing known amounts of dissolved hydrogen. Our data reveal that the H2O-undersaturated peridotite solidus is hotter than previously thought. Reconciling geophysical observations of the melting regime beneath the East Pacific Rise with our experimental results requires that existing estimates for the oceanic upper mantle potential temperature be adjusted upward by about 60°C.
DS201708-1581
2017
Hauri, E.H.Van Rythoven, A.D., Schulze, D.J., Hauri, E.H., Wang, J., Shirey, S.Intra-crystal co-variations of carbon isotopes and nitrogen contents in diamond from three north american cratons. A54 south ( Diavik) Slave craton; Lynx dike Superior craton ; Kelsey Lake Wyoming cratonChemical Geology, in press available 54p.Canada, Northwest Territories, Quebec, United States, Coloradodeposit, A54, Lynx, Kelsey Lake

Abstract: Eighteen diamond samples from the A154 South kimberlite pipe (Diavik Mine), Slave Craton, Northwest Territories (Canada); sixteen diamond samples from the Lynx kimberlite dyke, Superior Craton, Quebec (Canada) and twelve diamond samples from the Kelsey Lake kimberlite pipe, Wyoming Craton, Colorado (USA), were cut through the core-zones, polished, imaged by cathodoluminescence (CL), and analyzed by secondary ion mass spectrometry (SIMS) for carbon isotope composition and nitrogen abundance. Twenty Kelsey Lake diamond plates, including the twelve crystals analyzed by SIMS, were analyzed by Fourier transform infrared spectrometry (FTIR) for nitrogen concentration and aggregation state. Diamond samples from Diavik and Kelsey Lake have average ?13CPDB and nitrogen contents (atomic ppm) similar to those found by earlier studies: averaging between ? 3.9‰ and 486 ppm, and ? 7‰ and 308 ppm, respectively. Samples from the Lynx dyke, investigated for the first time, are substantially different, having ?13C = ?1.2‰ and nitrogen content = 32 ppm (averages). All three localities have examples of significant variations in nitrogen content (> 100 ppm) within single stones. Carbon isotope variation within individual stones is relatively minor (< 2‰). In terms of nitrogen aggregation, samples from the Kelsey Lake kimberlite are dominated by zones of Type IaA, but mixed-type and Type IaB (less common) stones also occur. For the majority of samples, overall intra-diamond zonations of nitrogen abundances and carbon isotope ratios are not in agreement with modeled trends for single-event Rayleigh fractionation of diamond from fluid under nitrogen-compatible conditions at 1100 °C. The involvement of fluids from subducted crustal reservoirs with exceptionally light, and in the case of Lynx samples, exceptionally heavy ?13CPDB values is necessary to explain the observed growth histories of all the samples studied here.
DS201912-2788
2020
Hauri, E.H.Hauri, E.H., Cottrell, E., Kelley, K.A., Tucker, J.M., Shimizu, K., Le Voyer, M., Marske, J., Sall, A.E.Carbon in the convecting mantle. IN: Deep carbon: past to present, Orcutt, Daniel, Dasgupta eds., pp. 237-275.Mantlecarbon

Abstract: This chapter provides a summary of the flux of carbon through various oceanic volcanic centers such as mid-ocean ridges and intraplate settings, as well as what these fluxes indicate about the carbon content of the mantle. By reviewing methods used to measure the carbon geochemistry of basalts and then to estimate fluxes, the chapter provides insight into how mantle melting and melt extraction processes are estimated. The chapter discusses how the flux of carbon compares with other incompatible trace elements and gases. From there, the chapter discusses whether the budget of carbon in the ocean mantle can be explained by primordial carbon or whether carbon recycling is required to balance the budget.
DS201912-2824
2019
Hauri, E.H.Shimizu, K., Saal, A.E., Hauri, E.H., Perfit, M.R., Hekinian, R.Evaluating the roles of melt rock interaction and partial degassing on the CO2/Ba ratios of MORB: implications of the CO2 budget in the Earth's depleted upper mantle.Geocimica et Cosmochimica Acta , Vol. 260, pp. 29-48.Mantlemelting

Abstract: Carbon content in the Earth's depleted upper mantle has been estimated in previous studies using CO2/Ba ratios of CO2 undersaturated depleted mid-ocean ridge basalt (D-MORB) glasses and melt inclusions. However, CO2/Ba ratios in CO2 undersaturated MORB may not necessarily record those of the mantle source, as they may be affected by (1) assimilation of Ba-rich plagioclase-bearing rocks in the oceanic crust and (2) CO2 degassing through partial degassing and mixing. In this study, we evaluate these effects on the CO2/Ba ratios as well as other volatile to refractory trace element ratios (H2O/Ce, F/Nd, Cl/K, and S/Dy) in D-MORBs using the compositions of olivine-hosted melt inclusions and glasses from the Siqueiros and Garrett transform faults. The Siqueiros and Garrett melt inclusions are CO2 undersaturated and highly depleted in incompatible trace elements, and their average CO2/Ba ratios show relatively large ranges of 90?±?34 and 144?±?53 respectively. A subset of melt inclusions in lavas from both transform faults show potential signatures of contamination by plagioclase-rich rocks, such as correlations between major elements contents (e.g., FeO, Al2O3, and MgO), and trace element ratios (e.g., Sr/Nd). We find that (1) assimilation fractional crystallization (AFC) of gabbro into D-MORB and (2) mixing between partial melts of gabbro and D-MORB can reproduce the observed range in Sr/Nd ratios as well as the general trends between major elements. However, we find that these processes had limited effects on the CO2/Ba ratio of the melt inclusions and it is unlikely that they can account for the observed range in the CO2/Ba ratio. On the other hand, while a partial degassing and mixing model can generate melts with large range of CO2/Ba ratios (as proposed by Matthews et al. (2017)), it cannot reproduce the Pearson correlation coefficients between CO2/trace element and 1/trace element ratios observed in the Siqueiros and Garrett melt inclusions. Instead, when analytical uncertainties on the elemental concentrations are considered, a model without partial degassing can adequately reproduce the majority of the observed range in CO2/Ba ratio and Pearson correlation coefficients. Hence, we postulate that the Siqueiros and Garrett melt inclusions are undegassed and use their average CO2/Ba ratios to estimate the Siqueiros and Garrett mantle source CO2 contents (21?±?2?ppm and 33?±?6?ppm respectively). We also evaluate the effects of shallow level crustal processes on H2O/Ce, F/Nd, Cl/K, and S/Dy ratios, and after which we filter those effects, we estimate the H2O, F, Cl and S contents in the mantle sources of the Siqueiros (40?±?8?ppm, 8?±?1?ppm, 0.22?±?0.04?ppm, and 113?±?3?ppm) and Garrett (51?±?9?ppm, 6?±?1?ppm, 0.27?±?0.07?ppm, and 128?±?7?ppm) melt inclusions.
DS201912-2825
2020
Hauri, E.H.Shirey, S.B., Smit, K.V., Pearson, D.G., Walter, M.J., Aulbach, S., Brenker, F.E., Bureau, H., Burnham, A.D., Cartigny, P., Chacko, T., Frost, D.J., Hauri, E.H., Jacob, D.E., Jacobsen, S.D., Kohn, S.C., Luth, R.W., Mikhail, S., Navon, O., Nestola, F., NimDiamonds and the mantle geodynamics of carbon: deep mantle carbon and evolution from the diamond record.IN: Deep carbon: past to present, Orcutt, Daniel, Dasgupta eds., pp. 89-128.Mantlegeodynamics

Abstract: The science of studying diamond inclusions for understanding Earth history has developed significantly over the past decades, with new instrumentation and techniques applied to diamond sample archives revealing the stories contained within diamond inclusions. This chapter reviews what diamonds can tell us about the deep carbon cycle over the course of Earth’s history. It reviews how the geochemistry of diamonds and their inclusions inform us about the deep carbon cycle, the origin of the diamonds in Earth’s mantle, and the evolution of diamonds through time.
DS202001-0039
2020
Hauri, E.H.Shirey, S.B., Smit, K.V., Pearson, D.G., Walter, M.J., Aulbach, S., Brenker, F.E., Bureau, H., Burnham, A.D., Cartigny, P., Chacko, T., Frost, D.J., Hauri, E.H., Jacob, D.E., Jacobsen, S.D., Kohn, S.C., Luth, R.W., Mikhail, S., Navon, O., Nestola, F., NimDiamonds and mantle geodynamics of carbon: IN: Deep Carbon: past to present. Editors Orcutt, Danielle, Dasgupta, pp. 89-128.Mantlegeodynamics

Abstract: The science of studying diamond inclusions for understanding Earth history has developed significantly over the past decades, with new instrumentation and techniques applied to diamond sample archives revealing the stories contained within diamond inclusions. This chapter reviews what diamonds can tell us about the deep carbon cycle over the course of Earth’s history. It reviews how the geochemistry of diamonds and their inclusions inform us about the deep carbon cycle, the origin of the diamonds in Earth’s mantle, and the evolution of diamonds through time.
DS202107-1128
2019
Hauri, E.H.Shirey, S.B., Smit, K.V., Pearson, D.G., Walter, M.J., Aulbach, S., Brenker, F.E., Bureau, H., Burnham, A.D., Cartigny, P., Chacko, T., Frost, D.J., Hauri, E.H., Jacob, D.E., Jacobsen, S.D., Kohn, S.C., Luth, R.W., Mikhail, S., Navon, O.. Nestola, F., NimDiamonds and mantle geodynamics of carbon.Deep Carbon - Cambridge University Press , Cambridge.org 40p. PdfMantlecarbon
DS202111-1763
2021
Hauri, E.H.Chin, E.J., Chilson-Parks, B., Boneh, Y., Hirth, G., Saal, A.E., Hearn, B.C., Hauri, E.H.The peridotite deformation cycle in cratons and the deep impact of subduction.Tectonophysics, Vol. 817, 229029, 22p. PdfUnited States, Wyomingdeposit - Homestead, Williams

Abstract: Xenoliths play a crucial role in interpretation of mantle deformation and geochemistry. The classic work of Mercier and Nicolas (1975) introduced the concept of the peridotite deformation cycle, which connected observed microstructures to a physical sequence of deformation. We revisit Mercier and Nicolas' original concept, bringing in new constraints using large area EBSD maps and associated microstructural datasets, analysis of water contents in nominally anhydrous minerals, and trace element chemistry of pyroxenes and garnets. We apply these techniques to a well-characterized suite of peridotite xenoliths from the Eocene-age Homestead and Williams kimberlites in the northwestern Wyoming Craton. Pyroxene water content and trace element mineral chemistries reveal ubiquitous hydrous metasomatism beneath the craton, most likely linked to the Cenozoic Laramide Orogeny. Homestead xenoliths primarily exhibit coarse protogranular and equigranular textures, B-type olivine fabrics, and generally elevated mineral water contents compared to Williams. Xenoliths from Williams are strongly deformed, with porphyroclastic and transitional textures containing annealed olivine tablets, mostly A-type olivine fabrics, and generally lower mineral water contents. As a whole, mantle from Homestead to Williams reflects a cratonic scale deformation cycle that likely initiated in Laramide times and lasted until the end of orogeny in the Eocene. At Williams, evidence for a rapid deformation “sub-cycle” within the main deformation cycle is preserved in the tablet-bearing xenoliths, corresponding to the enigmatic “transitional” texture of Mercier and Nicolas (1975). Our results suggest that this texture reflects interruption of the main deformation cycle by processes possibly related to a rapidly forming lithospheric instability and generation of the kimberlite magma - offering a new interpretation of this ambiguous peridotite texture. Collectively, our results incorporate typically disparate geochemical and textural datasets on xenoliths to shed new insights into how metasomatism, volatiles, and deformation are connected in the deep cratonic lithosphere.
DS1993-0641
1993
Haus, M.Haus, M., Pauk, T.PETROCH lithogeochemical data.. accompanied by 5 5.25 disc in ASCIIdatafilesOntario Geological Survey, Open file, No. 5855OntarioGeochemistry -lithogeochemistry, Computer program -PETROCH
DS2002-1669
2002
Hauschild, J.Villinger, H., Grevemeyer, I., Kaul, N., Hauschild, J., Pfender, M.Hydrothermal heat flux through aged oceanic crust: where does the heat escape?Earth and Planetary Science Letters, Vol. 202, 1, pp.159-170.MantleGeothermometry
DS1995-0769
1995
Hausel, D.Hausel, D.Diamonds; International California Mining Journal, 1995International California Mining Journal, August pp. 28-30.GlobalDiamonds -popular brief overview, Kimberlites
DS1999-0300
1999
Hausel, D.Hausel, D., Gregory, R.W.Geology, diamond potential, geochemistry, and geophysics Iron Mountain kimberite district.Geology and mineral of Wyoming, Oct. 14, 15. abstract pp. 25-26.WyomingGrant Creek, Eagle Rock, Geophysics - em, mag
DS1992-0684
1992
Hausel, H.D.Hausel, H.D., Marlatt, G.G., Nielson, E.L., Gregory, R.H.Preliminary study of metals and precious stones along the Union Pacific right of way, southern WyomingWyoming Geological Survey Open File Report, No. 92-5, 79pWyomingDiamonds mentioned
DS1975-0525
1977
Hausel, W.D.Hausel, W.D.Report on the Boden Placer Diamonds from the Medicine Bow Mountains Carbon County Wyoming.Wyoming Geological Survey Internal Report, 9P.United States, Wyoming, Rocky Mountains, Medicine Bow MountainsKimberlite, State Line Medicine Bow Mountains, Rocky Mountains
DS1975-1062
1979
Hausel, W.D.Hausel, W.D.Diamond Bearing and Non Diamond Bearing Kimberlites in Colorado and Wyoming.Lecture Presented Before The American Chemical Society In La, 1P. (abstract.).United States, Colorado, Wyoming, State Line, Rocky MountainsBlank
DS1975-1063
1979
Hausel, W.D.Hausel, W.D., Mccallum, M.E., Woodzick, T.L.Preliminary Report on Exploration for Diamondiferous Kimberlites Colorado and Wyoming.Colorado Mining Association Yearbook, PP. 109-122.United States, Colorado, Wyoming, State Line, Rocky MountainsAlluvial Sampling, Prospecting, Geophysics, Kimberlite
DS1975-1064
1979
Hausel, W.D.Hausel, W.D., Mccallum, M.E., Woodzick, T.L.Exploration for Diamond Bearing Kimberlite in Colorado and Wyoming-anWyoming Geological Survey Report Investigations, No. 19, 29P.United States, Colorado, Wyoming, State Line, Rocky MountainsBlank
DS1975-1065
1979
Hausel, W.D.Hausel, W.D., Mccallum, M.E., Woodzick, T.L.Update on Exploration for Diamonds in Colorado Wyoming Kimberlite Province.A.a.p.g.s.e.p.m. Meeting, Vol. 63, No. 5, P. 830, (abstract.).United States, Colorado, Wyoming, State Line, Rocky MountainsBlank
DS1975-1066
1979
Hausel, W.D.Hausel, W.D., Reavis, G.L.Review of Diamond Prospecting in Northern Colorado and Southern Wyoming.Northwest Mining Association 85th. Annual Meeting, ABSTRACT.United States, Colorado, Wyoming, State Line, Rocky MountainsBlank
DS1975-1067
1979
Hausel, W.D.Hausel, W.D., Reavis, G.L., Stephenson, T.R.Prospecting for Kimberlite in Wyoming Using Heavy Mineral Alluvial sampling Methods.Wyoming Geological Survey Open File Report, No. 79-6, 13P.United States, Wyoming, State Line, Rocky MountainsBlank
DS1980-0165
1980
Hausel, W.D.Hausel, W.D., Glahn, P.R., Woodzick, T.L.Exploration for Diamond Bearing Kimberlite in Colorado and Wyoming- an update.American Institute of Mining, Metallurgical, and Petroleum Engineers (AIME) REPRINT., No. 80-310, 4P.United States, Colorado, Wyoming, State Line, Rocky MountainsBlank
DS1980-0166
1980
Hausel, W.D.Hausel, W.D., Mccallum, M.E.General Review of Northern Colorado and Southeastern Wyoming Kimberlites ,diamonds and Related Research Activity.Colorado Geological Survey, No. 8, PP. 106-115.United States, Colorado, Wyoming, State Line, Rocky MountainsBlank
DS1981-0206
1981
Hausel, W.D.Hausel, W.D.Diamond Exploration in Colorado and WyomingNewsletter West Texas Geological Society, Vol. 21, P. 7, (abstract.).United States, Colorado, Wyoming, State Line, Rocky MountainsBlank
DS1981-0207
1981
Hausel, W.D.Hausel, W.D.Notes on Diamond Discussions With J.d. Love and R.w. MarrsWyoming Geological Survey Unpub. Notes On Mineral Files, 1P.United States, State Line, Colorado, WyomingBlank
DS1981-0208
1981
Hausel, W.D.Hausel, W.D., Glahn, P.R., Woodzick, T.L.Geological and Geophysical Investigations of Kimberlite in The Laramie Range of Southeastern Wyoming.Wyoming Geological Survey Prelim. Report, No. 18, 13P.United States, Wyoming, State Line, Rocky MountainsKimberlite, Geophysics, Geochemistry, Geology, Schaffer
DS1982-0262
1982
Hausel, W.D.Hausel, W.D.Investigations Related to Prospecting for Diamond Bearing Kimberlite.Quarterly Smmrri Report To U.s. Department Interior State Mining, 1P. DATED MARCH 31ST.United States, Wyoming, State Line, Rocky MountainsGeochemistry
DS1982-0263
1982
Hausel, W.D.Hausel, W.D.Diamond Bearing Kimberlites. In: Ore Deposits of WyomingWyoming Geological Survey Prelim. Report, No. 19, PP. 17-20.United States, Wyoming, State Line, Oregon, Medicine Bow MountainsBlank
DS1982-0264
1982
Hausel, W.D.Hausel, W.D., Albert, K., Brink, C., Roberts, J.Report on Investigations Related to Prospecting for Diamond bearing Kimberlite and Related Placer Deposits in Wyoming.Wyoming Geological Survey Open File Report, No. 82-1, 48P.United States, Wyoming, State Line, Rocky Mountains, Green River BasinGeochemistry, Prospecting
DS1982-0397
1982
Hausel, W.D.Marrs, R.W., Hausel, W.D.Detection of Diamond Bearing Kimberlites in the Colorado Wyoming Kimberlite Province. #1Report Submitted To Nasa/jet Propulsion Laboratory, First Qu, 3P.Colorado, Wyoming, United States, State Line, Rocky MountainsKimberlite, Geophysics, Soil Sampling, Geochemistry
DS1982-0398
1982
Hausel, W.D.Marrs, R.W., Hausel, W.D.Detection of Diamond Bearing Kimberlites in the Colorado Wyoming Kimberlite Province. #2Report Submitted To Nasa/jet Propulsion Laboratory Second Qu, 2P.Colorado, Wyoming, United States, State Line, Rocky MountainsKimberlite, Multispectral Remote Sensing, Geophysics
DS1983-0150
1983
Hausel, W.D.Brink, C., Albert, K.C., Hausel, W.D.Stream Sediment Sampling for Kimberlite in Colorado-wyoming, and Techniques of Diamond Extraction.Wyoming Geological Survey Public Inf. Circular, No. 19, PP. 40-41.United States, State Line, Colorado, WyomingProspecting, Sampling
DS1983-0292
1983
Hausel, W.D.Hausel, W.D.Diamond Bearing Kimberlite Pipes in Wyoming and Colorado. #2Rocks And Minerals, Vol. 58, No. 5, OCTOBER PP. 241-244.United States, Colorado, Wyoming, State Line, Rocky MountainsGeology
DS1983-0293
1983
Hausel, W.D.Hausel, W.D.Diamond Bearing Kimberlite Pipes in Wyoming and Colorado. #1Wyoming Geological Survey, Information Circular, 8P.United States, Colorado, Wyoming, State Line, Rocky MountainsGeology, History
DS1983-0294
1983
Hausel, W.D.Hausel, W.D., Albert, K.G.A Review of the Geology, Exploration Methods and Diamond Extraction Techniques of Colorado and Wyoming Kimberlites.American Mining Congress Meeting Held San Francisco, Sept. 1, EXPLORATION and TECHNOLOGY SESSION, SEPT. 14TH. 6P.United States, Colorado, Wyoming, State Line, Rocky MountainsMining Engineering, Geology, Prospecting, Evaluation, Sampling
DS1983-0447
1983
Hausel, W.D.Memmi, J.M., Mccallum, M.E., Hausel, W.D.Preliminary Results of Resistivity Investigations of Colorado Wyoming Kimberlite Diatremes.Geological Society of America (GSA), Vol. 15, No. 5, P. 317. (abstract.).United States, Colorado, Wyoming, State Line, Rocky MountainsGeophysics, Kimberlite
DS1984-0347
1984
Hausel, W.D.Hausel, W.D., Roberts, J.T.Economic Geology of the Colorado Wyoming Kimberlite ProvinceAmerican Institute of Mining, Metallurgical, and Petroleum Engineers (AIME) MEETING, RAPID CITY, SOUTH DAKOTA., PREPRINT 25P. SEPT. 13TH.United States, Colorado, Wyoming, State Line, Rocky Mountains, OregonGeology, Prospecting, Geochemistry, Testing, Grease Table
DS1984-0484
1984
Hausel, W.D.Marrs, R.W., Marks, J., Hausel, W.D., Albert, K.G.Detection of Diamond Bearing Kimberlites in the Colorado Wyoming Province. #2Nasa Jet Propulsion Laboratory, Final Report Dated Sept. 28t, 70P.United States, Colorado, Wyoming, State Line, Rocky MountainsRemote Sensing, Geochemistry, Sampling, Prospecting, Geophysics
DS1984-0485
1984
Hausel, W.D.Marrs, R.W., Marks, J.E., Hausel, W.D., Albert, G.K.Detection of Diamond Bearing Kimberlites in the Colorado Wyoming Province. #1International Symposium on Remote Sensing of Environment., THIRD THEMATIC CONFERENCE, APRIL 16TH.-19TH. 11P.United States, State Line, Colorado, WyomingLandsat, Remote Sensing, Geophysics, Analyses, Diatreme
DS1985-0270
1985
Hausel, W.D.Harris, R.E., Hausel, W.D., Meyer, J.E.Metallic and Industrial Minerals Map of WyomingGeological Survey WYOMING, 1:500, 000 IN COLOUR.United States, State Line, WyomingDiamond Occurrences
DS1985-0273
1985
Hausel, W.D.Hausel, W.D.Diamond Bearing Kimberlite Pipes in Wyoming and Colorado. #3Wyoming Geological Survey, Information Circular, 10P.United States, State Line, WyomingDiamond, Geology, History, Sampling, Prospecting, Extracting
DS1985-0274
1985
Hausel, W.D.Hausel, W.D., Mccallum, M.E., Roberts, J.T.The Geology, Diamond Testing Procedures, and Economic Potential of the Colorado Wyoming Kimberlite Province- a Review.Wyoming Geological Survey Report Inv., No. 31, 23P.United States, State Line, Colorado, WyomingHistory, Geology, Location, Diamond Occurrences, Prospecting
DS1988-0292
1988
Hausel, W.D.Hausel, W.D., Sutherland, W.M., Gregory, E.B.Stream-sediment sample results in search of kimberlite intrusives in southeastern WyomingUnited States Geological Survey (USGS) Open File, No. 88-11, 11p. Map 1: 100, 000WyomingGeochemistry, Sampling-Stream-sediment
DS1989-0601
1989
Hausel, W.D.Hausel, W.D., Erlich, E.I., Sutherland, W.M.Timing of alkaline and ultramafic alkaline volcanism within the the Siberian and the North American ancient platformsNew Mexico Bureau of Mines Bulletin., Continental Magmatism Abstract Volume, Held, Bulletin. No. 131, p. 123. AbstractUnited States,RussiaTectonics, Alkaline
DS1990-0453
1990
Hausel, W.D.Erich, E.I., Sutherland, W.M., Hausel, W.D., Zagruzina, I.A.Temporal distribution of the ultramafic-alkalic and alkalic rocks withIn the Russian, Siberian and North American ancient platforms and theirsurroundingsGeological Survey of Wyoming Open File Report, No. 89-9, 33pWyoming, RussiaAlkaline rocks, Craton
DS1991-0683
1991
Hausel, W.D.Hausel, W.D., Edwards, B.R., Graff, P.J.Geology and mineralization of the Wyoming ProvinceAmerican Institute of Mining, Metallurgical, and Petroleum Engineers (AIME) Preprint, No. 91-72, 12pWyomingBreif mention -diamonds, Overview geology
DS1994-0737
1994
Hausel, W.D.Hausel, W.D.Appalachian diamonds old discoveries, new frontierInternational California Mining Journal, November pp. 36-37.AppalachiaNews item, Diamond finds -history
DS1994-0738
1994
Hausel, W.D.Hausel, W.D.Pacific coast diamonds: an unconventional source terraneWyoming Geological Survey Mineral Report, No. 94-8, 15p.CaliforniaDiamonds
DS1994-0739
1994
Hausel, W.D.Hausel, W.D.Diamonds, kimberlites, lamproites and related rocks in the United States. #1Wyoming Geological Survey Mineral Report, No. 94-2, 48p.United StatesOverview, Alkaline, kimberlites, lamproites
DS1994-0740
1994
Hausel, W.D.Hausel, W.D.Diamonds, kimberlites, lamproites and related rocks in the United States. #3Preprint, 50p.United States, Colorado, Wyoming, AppalachiaOverview, Review paper kimberlites, diamonds
DS1994-0741
1994
Hausel, W.D.Hausel, W.D.Diamonds dominated exploration activities in WyomingInternational California Mining Journal, May pp. 27-32.WyomingNews item, Diamond finds -history
DS1994-0742
1994
Hausel, W.D.Hausel, W.D., Harris, R.E., Moore, T.A.Diamond exploration and history of WyomingMining Engineering, Vol. 46, No. 5, May pp. 421, 422.WyomingNews item, Redaurum
DS1995-0770
1995
Hausel, W.D.Hausel, W.D.Diamonds... brief overview of companies and properties.. Guardian, Redaurum, Royalstar...Wyoming Geo-Notes, August, pp. 34-40.Colorado, WyomingOverview of area properties -history, Diamond exploration
DS1995-0771
1995
Hausel, W.D.Hausel, W.D.Diamonds and their host rocks in the United States. *note listed as apreprint from author last year.Mining Engineering, Vol. 47, No. 8, August pp. 723-732.United States, ColoradoDiamond -list of stones, occurrences, Overview of areas - exploration
DS1995-0772
1995
Hausel, W.D.Hausel, W.D.Diamonds, kimberlites, lamproites and related rocks in the United States. #2Exploration and Mining Geology, Vol. 4, No. 3, July pp. 243-270.United States, Wyoming, Colorado, CaliforniaKimberlites, Lamproites
DS1995-0773
1995
Hausel, W.D.Hausel, W.D., Stahl, S.The Great Diamond Hoax of 1872Wyoming Geol. Association Field Conference Guidebook, pp. 13-28.ColoradoHistory -diamond hoax 1872
DS1996-0614
1996
Hausel, W.D.Hausel, W.D.Pacific Coast diamonds - an unconventional source terraneGeological Society Nevada Proceedings Ore Deposits of American Cord., Vol. 2, pp. 925-934.California, Oregon, Washington, AlaskaHistory
DS1996-0615
1996
Hausel, W.D.Hausel, W.D.Recurring kimberlite and lamproite magmatism in the Wyoming craton: anoverview.Geological Society of America (GSA) abstract Vol., Vol. 28, No. 4, March p. 10.WyomingCraton, Lamproite, kimberlite
DS1996-0616
1996
Hausel, W.D.Hausel, W.D.Diamonds, kimberlites and lamproites in the Wyoming Craton, Western USASociety for Mining, Metallurgy and Exploration (SME)/American Institute of Mining, Metallurgical, and Petroleum Engineers (AIME) PHoenix, Arizona, March 14th., p. 49. AbstractWyoming, ColoradoDiamond genesis, Craton -Wyoming
DS1996-0617
1996
Hausel, W.D.Hausel, W.D., et al.Diamondiferous breccia pipes in the southern Green River Basin, WyomingWyoming 32nd. Annual Forum Geology Industrial Minerals, pp. 23-24.WyomingBreccia pipes, Green River Basin
DS1997-0488
1997
Hausel, W.D.Hausel, W.D., Kucera, R.E., McCandless, T.E., GregoryDiamond exploration potential of the Wyoming craton, western USA ... extends into southernmost Alberta.Wyom. Geol. Association Guidebook, No. 48, pp. 139-176.Alberta, Wyoming, SaskatchewanCraton - brieg mention of Wyoming province
DS1998-0597
1998
Hausel, W.D.Hausel, W.D., Kucera, R.E., McCandless, T.E., GregoryMantle derived diatremes in the southern Green River Basin, Wyoming, USA7th International Kimberlite Conference Abstract, pp. 320-1.WyomingDiatremes, Deposit - Cedar Mountain
DS2001-0459
2001
Hausel, W.D.Hausel, W.D., Gregory, R.W., Moten, R.H., Sutherland, W.M.Economic geology of the Iron Mountain kimberlite district, WyomingWyoming Geological Association Guidebook, No. 51, pp. 151-164.WyomingGeology - Iron Mountain
DS2002-0433
2002
Hausel, W.D.Erlich, E.I., Hausel, W.D.Diamond deposits: origin, exploration, and history of discoverySociety of Mining, Metallurgy and Exploration Inc., 392p. approx. $ 129.00 USGlobalBook - diamond genesis, technology, techniques
DS2003-0376
2003
Hausel, W.D.Ehrlich, E.I., Hausel, W.D.Timing of kimberlite magmatism and different types of diamond bearing complexes8ikc, Www.venuewest.com/8ikc/program.htm, Session 1 POSTER abstractGlobalKimberlite geology and economics
DS1970-0711
1973
Hausen, D.M.Hausen, D.M.Description of Kimberlite Types at the Kao Pipe, North Central Lesotho.Newmont Exploration Ltd., UNPUB.LesothoGeology
DS1991-0684
1991
Hausen, D.M.Hausen, D.M., Oderkirk, J.R.XRD mineralogic logging of drill samples from gold and copper miningoperationsOre Geology Reviews, Special issue -Applied mineralogy in exploration, Vol. 6, No. 2-3, May pp. 107-118NevadaSampling -logging, XRD.
DS200712-0421
2007
Hauser, B.Hatton, C., Hill, S., Apter, D., Evans, S., Hatch, D., Hauser, B.Measuring the width of the diamond window by logging the lithosphere with garnet compositions.Diamonds in Kimberley Symposium & Trade Show, Bristow and De Wit held August 23-24, Kimberley, South Africa, GSSA Diamond Workshop CD slides 27Africa, South AfricaGroup I,II kimberlites- plumes, peridotites, eclogites
DS1986-0598
1986
Hauser, E.Nelson, K.D., Allmendinger, R., Potter, C., Hauser, E., Brown, L.Reflection character of the continental MOHO and its tectonicsignificanceGeological Society of America (GSA) Abstract Volume, Vol. 18, No. 6, p. 704. (abstract.)GlobalTectonics
DS1989-1237
1989
Hauser, E.Pratt, T., Culotta, R., Hauser, E., Nelson, D., Brown, L., Kaufman, S.Major Proterozoic basement features of the eastern midcontinent of North america revealed by recent COCORP profilingGeology, Vol. 17, No. 6, June pp. 505-509MidcontinentTectonics, Geophysics
DS1986-0348
1986
Hauser, E.C.Hauser, E.C., Barnes, A., Gephart, J., Latham, T., Lundy, J.Brown.COCORP deep reflection transect in Arizona: across the transition zone from Colorado Plateau to core complexesEos, Vol. 67, No. 44, Nov. 4th. p. 1096. (abstract.)Colorado Plateau, ArizonaGeophysics, Tectonics
DS1990-0675
1990
Hauser, E.C.Hauser, E.C.Seismic imaging of extended crust with emphasis on the western UnitedStates: discussion and replyGeological Society of America (GSA) Bulletin, Vol. 102, No. 2, February pp. 252-255CordilleraGeophysics -seismics, Tectonics-crust, COCORP
DS1990-0676
1990
Hauser, E.C.Hauser, E.C.Layered Proterozoic rocks hidden beneath the United States midcontinent imaged by COCORP and industry seismic reflection dataGeological Society of America (GSA) Annual Meeting, Abstracts, Vol. 22, No. 7, p. A153GlobalTectonics, Seismics-COCORP
DS1991-0685
1991
Hauser, E.C.Hauser, E.C.Layered Proterozoic rocks and a Proterozoic angular unconformity beneath the U.S. midcontinent on Cocorp and reprocessed industry seismic reflectiondataGeological Society of America Annual Meeting Abstract Volume, Vol. 23, No. 5, San Diego, p. A 315GlobalMidcontinent, Geophysics -seismics
DS1991-1375
1991
Hauser, E.C.Pratt, T.L., Hauser, E.C., Hearn, T.M., Reston, T.J.Reflection polarity of the Midcrustal Surrency bright spot beneath southeastern Georgia. Testing the fluid hypothesisJournal of Geophysical Research, Vol. 96, No. B6, June 10, pp. 10, 145-10, 158GeorgiaGeophysics, Tectonics
DS1992-0685
1992
Hauser, E.C.Hauser, E.C.Layered Proterozoic rocks of the Eastern U.S. midcontinent and their involvement in Grenville Foreland thrustingEos Transactions, Vol. 73, No. 14, April 7, supplement abstracts p. 319Midcontinent, United StatesMidcontinent, Tectonics
DS1993-0642
1993
Hauser, E.C.Hauser, E.C.Grenville foreland thrust belt hidden beneath the eastern U.S.midcontinentGeology, Vol. 21, No. 1, January pp. 61-64Midcontinent, OhioTectonics, Structure, COCORP
DS1996-1056
1996
Hauser, F.O'Reilly, B.M., Hauser, F., Shannon, P.M.The lithosphere below the Rockall Trough: wide-angle seismic evidence for extensive serpentinization.Tectonophysics, Vol. 255, No. 1/2, pp. 1-24.GlobalLithosphere, Geophysics -seismics
DS1998-1099
1998
Hauser, F.O'Reilly, B.M., Readman, P.W., Hauser, F.Lithospheric structure across the western Eurasian obate from a wide angle seismic and gravity study...Earth and Planetary Science Letters, Vol. 156, pp. 275-280.GlobalGeothermometry - regional, basin, Geophysics - seismics
DS1998-1100
1998
Hauser, F.O'Reilly, B.M., Readman, P.W., Hauser, F.Lithospheric structure across the western Eurasian Plate from a wide angle seismic and gravity study...Earth and Planetary Science Letters, Vol. 156, No. 3-4, pp. 275-280.GlobalGeothermometry, Tectonics
DS2001-1027
2001
Hauser, M.Schilling, F.R., Hauser, M., Sinogeikin, S.V., Bass, J.Compositional dependence of elastic properties and density of glasses system anorthite diopside forsteriteContributions to Mineralogy and Petrology, Vol. 141, pp. 297-306.MantleMelting - silicate melts, migration
DS201112-0419
2010
Hauser, N.Hauser, N., Matteini, M., Omarini, R.H., Pimentel, M.M.Constraints on metasomatized mantle under central South America: evidence from Jurassic alkaline lamprophyre dykes from the eastern Cordillera, NM Argentina.Mineralogy and Petrology, Vol. 100, pp. 153-184.South America, ArgentinaLamprophyre
DS201812-2794
2018
Hauser, N.Crosta, A.P., Reimold, W.V., Vasconcelos, M.A.R., Hauser, N., Oliveira, G.J.G., Maziviero, M.V., Goes, A.M.Impact cratering: the South American record. Part 2.Chemie der Erde, doi.org/10.1016/j ,chemer.2018.09.002 30MBSouth America, Brazilmeteorite

Abstract: In the first part of this review of the impact record of South America, we have presented an up-to-date introduction to impact processes and to the criteria to identify/confirm an impact structure and related deposits, as well as a comprehensive examination of Brazilian impact structures. The current paper complements the previous one, by reviewing the impact record of other countries of South America and providing current information on a number of proposed impact structures. Here, we also review those structures that have already been discarded as not being formed by meteorite impact. In addition, current information on impact-related deposits is presented, focusing on impact glasses and tektites known from this continent, as well as on the rare K-Pg boundary occurrences revealed to date and on reports of possible large airbursts. We expect that this article will not only provide systematic and up-to-date information on the subject, but also encourage members of the South American geoscientific community to be aware of the importance of impact cratering and make use of the criteria and tools to identify impact structures and impact deposits, thus potentially contributing to expansion and improvement of the South American impact record.
DS201907-1539
2019
Hauser, N.Crosta, A.P., Reimold, W.U., Vasconcelos, M.A.R., Hauser, N., Oliveira, G.J.G.Impact cratering: the South American record - Part 2. Brazil was covered in Part 1. Geochemistry, Vol. 79, pp. 191-220.South Americameteorite

Abstract: In the first part of this review of the impact record of South America, we have presented an up-to-date introduction to impact processes and to the criteria to identify/confirm an impact structure and related deposits, as well as a comprehensive examination of Brazilian impact structures. The current paper complements the previous one, by reviewing the impact record of other countries of South America and providing current information on a number of proposed impact structures. Here, we also review those structures that have already been discarded as not being formed by meteorite impact. In addition, current information on impact-related deposits is presented, focusing on impact glasses and tektites known from this continent, as well as on the rare K-Pg boundary occurrences revealed to date and on reports of possible large airbursts. We expect that this article will not only provide systematic and up-to-date information on the subject, but also encourage members of the South American geoscientific community to be aware of the importance of impact cratering and make use of the criteria and tools to identify impact structures and impact deposits, thus potentially contributing to expansion and improvement of the South American impact record.
DS1994-0232
1994
Haussinger, H.Buhn, B., Haussinger, H., Kramm, U., et al.Tectonometamorphic patterns developed during Pan-African continental collision in Damara In land BeltChemie der Erde, Vol. 54, pp. 329-354Namibiametamorphism, Orogeny -Pan African, Congo Craton, Tectonics
DS1984-0348
1984
Haut, F.R.Haut, F.R., Levin, P., Eisenburger, D.Diamantfuehrende Ultrabasite in ObervoltaGeol. Jahrb., Upper Volta, West AfricaKimberlite, Geophysics, Geology, Diamonds
DS1983-0214
1983
Haut, R.Eisenburger, D., Hannak, W., Haut, R., Knabe, W., Levin, P., MullCircular Magnetic Structures in Upper Volta and Their Geological Significance for Prospecting.Journal of AFRICAN EARTH SCI., Vol. 1, No. 3-4, P. 358. (abstract.).West Africa, Upper VoltaGeotectonics
DS2000-0393
2000
Hautot, S.Hautot, S., tarits, P., Le Turdu, C.Deep structure of the Baringo Rift Basin from three dimensional magnetotelluric imaging: rift evolution.Journal of Geophysical Research, Vol. 105, No.B 10, Oct.10, pp.23493-518.KenyaGeophysics - magnetotellurics, Tectonics - rifting
DS201802-0232
2017
Hautot, S.Ebinger, C.J., Keir, D., Bastow, I.D., Whaler, K., Hammond, J.O.S., Miller, A.A., Tiberi, M.S., Hautot, S.Crustal structure of active deformation zones in Africa: implications for global crustal processes.Tectonics, Vol. 36, 10.1002/2017TC004526Africatectonics

Abstract: The Cenozoic East African rift (EAR), Cameroon Volcanic Line (CVL), and Atlas Mountains formed on the slow-moving African continent, which last experienced orogeny during the Pan-African. We synthesize primarily geophysical data to evaluate the role of magmatism in shaping Africa's crust. In young magmatic rift zones, melt and volatiles migrate from the asthenosphere to gas-rich magma reservoirs at the Moho, altering crustal composition and reducing strength. Within the southernmost Eastern rift, the crust comprises ~20% new magmatic material ponded in the lower crust and intruded as sills and dikes at shallower depths. In the Main Ethiopian Rift, intrusions comprise 30% of the crust below axial zones of dike-dominated extension. In the incipient rupture zones of the Afar rift, magma intrusions fed from crustal magma chambers beneath segment centers create new columns of mafic crust, as along slow-spreading ridges. Our comparisons suggest that transitional crust, including seaward dipping sequences, is created as progressively smaller screens of continental crust are heated and weakened by magma intrusion into 15-20 km thick crust. In the 30 Ma Recent CVL, which lacks a hot spot age progression, extensional forces are small, inhibiting the creation and rise of magma into the crust. In the Atlas orogen, localized magmatism follows the strike of the Atlas Mountains from the Canary Islands hot spot toward the Alboran Sea. CVL and Atlas magmatism has had minimal impact on crustal structure. Our syntheses show that magma and volatiles are migrating from the asthenosphere through the plates, modifying rheology, and contributing significantly to global carbon and water fluxes.
DS1859-0018
1801
Hauy, R.J.Hauy, R.J.Traite de MineralogieParis, 1ST. EDITION 1801; 2ND. EDITION 1822.GlobalMineralogy
DS1859-0026
1817
Hauy, R.J.Hauy, R.J.Sur l'usage des Caracteres Physiques des Mineraux, Pour la Distinction des Pierres Preciuses Qui Ont Ete Tailles.Paris: Memoires Des Museum D'histoire Naturelles, Vol. 3, PP. 353-390.GlobalDiamond Occurrence
DS1859-0027
1817
Hauy, R.J.Hauy, R.J.Traite des Caracteres Physique des Pierres Precieuses Pour Servir a Leur Determination Lorsqu'elles Ont Ete Taillees.Paris:, GlobalGemology
DS2003-1312
2003
Hauzenberger, C.Sommer, H., Kroner, A., Hauzenberger, C., Muhongo, S., Wingate, M.T.Metamorphic petrology and zircon geochronology of high grade rocks from the centralJournal of Metamorphic Geology, Vol. 21, 9, pp. 915-934.TanzaniaGeochronology - not specific to diamonds
DS200412-1877
2003
Hauzenberger, C.Sommer, H., Kroner, A., Hauzenberger, C., Muhongo, S., Wingate, M.T.Metamorphic petrology and zircon geochronology of high grade rocks from the central Mozambique belt of Tanzania: crustal recycliJournal of Metamorphic Geology, Vol. 21, 9, pp. 915-934.Africa, TanzaniaGeochronology - not specific to diamonds
DS200712-1015
2007
Hauzenberger, C.Sommer, H., Regenauer-Lieb, K.R., Hauzenberger, C.Diamonds, xenoliths and kimberlites: a window in the Earth's mantle. UNESCO IGCP 557.Plates, Plumes, and Paradigms, 1p. abstract p. A954.MantleE and P type diamonds
DS200812-1097
2008
Hauzenberger, C.Sommer, H., Regenauer Lieb, K., Hauzenberger, C., Gasharova, B.Rapid uplift of the Jwaneng kimberlite, south Botswana: caused by mantle metasomatism and documented by OH diffusion profiles in garnet from eclogitic xenoliths.Goldschmidt Conference 2008, Abstract p.A882.Africa, BotswanaDeposit - Jwaneng
DS201312-0499
2013
Hauzenberger, C.Konzett, J., Wirth, R., Hauzenberger, C., Whitehouse, M.Two episodes of fluid migration in the Kaapvaal Craton lithospheric mantle associated with Cretaceous kimberlite activity: evidence from a harzburgite containing a unique assemblage of metasomatic zirconium-phases.Lithos, Vol. 182-183, pp. 165-184.Africa, South AfricaDeposit - Kimberley
DS201810-2311
2018
Hauzenberger, C.Faryad, S.W., Jedlicka, R., Hauzenberger, C., Racek, M.High pressure crystallization vs. recrystallization origin of garnet pyroxenite-eclogite within subduction related lithologies. Bohemian MassifMineralogy and Petrology, Vol. 112, 5, pp. 603-616.Europe, Austriasubduction

Abstract: Mafic layers displaying transition between clinopyroxenite and eclogite within peridotite from felsic granulite in the Bohemian Massif (Lower Austria) have been investigated. The mafic-ultramafic bodies shared a common granulite facies metamorphism with its hosting felsic rocks, but they still preserve evidence of eclogite facies metamorphism. The selected mafic layer for this study is represented by garnet with omphacite in the core of coarse-grained clinopyroxene, while fine-grained clinopyroxene in the matrix is diopside. In addition, garnet contains inclusions of omphacite, alkali feldspars, hydrous and other phases with halogens and/or CO2. Textural relations along with compositional zoning in garnet from the clinopyroxenite-eclogite layers favour solid-state recrystallization of the precursor minerals in the inclusions and formation of garnet and omphacite during subduction. Textures and major and trace element distribution in garnet indicate two stages of garnet growth that record eclogite facies and subsequent granulite facies overprint. The possible model explaining the textural and compositional changes of minerals is that the granulite facies overprint occurred after formation and exhumation of the eclogite facies rocks.
DS202102-0239
2021
Hauzenberger, C.Zeug, M., Nasdala. L., Ende, M., Habler, G., Hauzenberger, C., Chanmuang, C., Skoda, R., Topa, D., Wildner, M., Wirth, R.The parisite - (Ce) enigma: challenges in the identification of fluorcarbonate minerals ( Bastanite)Mineralogy and Petrology, Vol. 115, 19p. Doi.org/101007 /s00710-020- 00723-x pdfSouth America, ColombiaREE

Abstract: A multi-methodological study was conducted in order to provide further insight into the structural and compositional complexity of rare earth element (REE) fluorcarbonates, with particular attention to their correct assignment to a mineral species. Polycrystals from La Pita Mine, Municipality de Maripí, Boyacá Department, Colombia, show syntaxic intergrowth of parisite-(Ce) with röntgenite-(Ce) and a phase which is assigned to B3S4 (i.e., bastnäsite-3-synchisite-4; still unnamed) fluorcarbonate. Transmission electron microscope (TEM) images reveal well-ordered stacking patterns of two monoclinic polytypes of parisite-(Ce) as well as heavily disordered layer sequences with varying lattice fringe spacings. The crystal structure refinement from single crystal X-ray diffraction data - impeded by twinning, complex stacking patterns, sequential and compositional faults - indicates that the dominant parisite-(Ce) polytype M1 has space group Cc. Parisite-(Ce), the B3S4 phase and röntgenite-(Ce) show different BSE intensities from high to low. Raman spectroscopic analyses of parisite-(Ce), the B3S4 phase and röntgenite-(Ce) reveal different intensity ratios of the three symmetric CO3 stretching bands at around 1100 cm?1. We propose to non-destructively differentiate parisite-(Ce) and röntgenite-(Ce) by their 1092 cm?1 / 1081 cm?1 ?1(CO3) band height ratio.
DS200612-0416
2005
Hauzenberger, C.A.Fritz, H., Tenczer, V., Hauzenberger, C.A., Wallbrecher, E., Hoinkes, G., Muhongo, S.Central Tanzanian tectonic map: a step forward to decipher Proterozoic structural events.Tectonics, Vol. 24, 6, TC6013. 10.1029/2005 TC001796Africa, TanzaniaTectonics
DS201012-0466
2010
Hauzenberger, Ch.Mair, P., Konzett, J., Hauzenberger, Ch.Metasomatic titanates associated with Cl rich amphibole and phlogopite in a multiply metasomatized garnet lherzolite from Letseng la Terae Lesotho.International Mineralogical Association meeting August Budapest, abstract p. 525.Africa, LesothoMineral chemistry
DS201212-0724
2012
Hauzenberger, Ch.Tenczer, V., Hauzenberger, Ch., Fritz, H., Hoinkes, G., Muhongo, S., Klotzli, U.Crustal age domains and metamorphic reworking of the deep crust in northern central Tanzania: a U Pb zircon and monazite study.Mineralogy and Petrology, in press availableAfrica, TanzaniaCraton, geochronology
DS201312-0907
2013
Hauzenberger, Ch.Teneczer, V., Hauzenberger, Ch., Fritz, H., Hoinkes, G., Mubongo, S., Klotzli, U.Crustal age domains and metamorphic reworking of the deep crust in northern central Tanzania: a U/Pb zircon and monazite age study.Mineralogy and Petrology, Vol. 107, pp. 679-707.Africa, TanzaniaGeochronology
DS202104-0620
2021
Hauzenbergerm C.Zeug, M., Nasdala, L., Ende, M., Habler, G., Hauzenbergerm C., Chanmuang, C.N., Skoda, R., Topa, D., Wildner, M., Wirth, R.The parisite-(De) enigma: challenges in the identification of fluorcarbonate minerals. REEMineralogy and Petrology, Vol 115, pp. 1-19. pdfSouth America, Columbiadeposit - La Pita

Abstract: A multi-methodological study was conducted in order to provide further insight into the structural and compositional complexity of rare earth element (REE) fluorcarbonates, with particular attention to their correct assignment to a mineral species. Polycrystals from La Pita Mine, Municipality de Maripí, Boyacá Department, Colombia, show syntaxic intergrowth of parisite-(Ce) with röntgenite-(Ce) and a phase which is assigned to B3S4 (i.e., bastnäsite-3-synchisite-4; still unnamed) fluorcarbonate. Transmission electron microscope (TEM) images reveal well-ordered stacking patterns of two monoclinic polytypes of parisite-(Ce) as well as heavily disordered layer sequences with varying lattice fringe spacings. The crystal structure refinement from single crystal X-ray diffraction data - impeded by twinning, complex stacking patterns, sequential and compositional faults - indicates that the dominant parisite-(Ce) polytype M1 has space group Cc. Parisite-(Ce), the B3S4 phase and röntgenite-(Ce) show different BSE intensities from high to low. Raman spectroscopic analyses of parisite-(Ce), the B3S4 phase and röntgenite-(Ce) reveal different intensity ratios of the three symmetric CO3 stretching bands at around 1100 cm-1. We propose to non-destructively differentiate parisite-(Ce) and röntgenite-(Ce) by their 1092 cm-1 / 1081 cm-1 ?1(CO3) band height ratio.
DS201312-0370
2013
Havenga, M.Havenga, M.A structural analysis of the geophysical signature relationship between linear features and plug like bodies of sheets 2229AB and 2229AD in the Limpopo province, South Africa.AEM-SAGA Conference, Poster title listedAfrica, South AfricaGeophysics
DS2001-0460
2001
Havens, E.Havens, E., Revenaugh, J.A broadband seismic study of the lowermost mantle beneath Mexico: constraints on ultralow velocity zoneJournal of Geophysical Research, Vol. 106, No. 12, pp. 30,809-20.MexicoGeophysics, Density, tectonics - not specific to diamonds
DS201711-2516
2017
Havig, J.R.Havig, J.R., Hamilton, T.L., Bachan, A., Kump, L.R.Sulfur and carbon isotopic evidence for metabolic pathway evolution and a four stepped Earth system progression across the Archean and Paleoproterozoic.Earth-Science Reviews, Vol. 174, pp. 1-21.Mantlegeochronology

Abstract: The Earth's mantle has provided a ready redox gradient of sulfur compounds (SO2, H2S) since the stabilization of the crust and formation of the ocean over 4 billion years ago, and life has evolved a multitude of metabolic pathways to take advantage of this gradient. These transitions are recorded in the sulfur and carbon isotope signals preserved in the rock record, in the genomic records of extant microorganisms, and in the changing mantle and crust structure, composition and cycling. Here, we have assembled approximately 20,000 sulfur (?34S, ?33S, ?36S) and carbon (?13C) isotope data points from scientific publications spanning over five decades of geochemical analyses on rocks deposited from 4.0 to 1.5 Ga. We place these data in the context of molecular clock and tectonic and surface redox indicators to identify overarching trends and integrate them into a holistic narrative on the transition of the Earth's surface towards more oxidizing conditions. The greatest extreme in ?34S values of sulfide minerals (? 45.5 to 54.9‰) and sulfate minerals (? 13.6 to 46.6‰) as well as ?13C values in carbonate minerals (? 16.8 to 29.6‰) occurred in the period following the Great Oxidation Event (GOE), while the greatest extremes in organic carbon ?13C values (? 60.9 to 2.4‰) and sulfide and sulfate mineral ?33S and ?36S values (? 4.0 to 14.3‰ and ? 12.3 to 3.2‰, respectively) occurred prior to the GOE. From our observations, we divide transitions in Earth's history into four periods: Period 1 (4.00 to 2.80 Ga) during which geochemical cycles were initialized, Period 2 (2.80 to 2.45 Ga) during which S and C isotope systems exhibit changes as conditions build up to the GOE, Period 3 (2.45 to 2.00 Ga) encompassing the GOE, and Period 4 (after 2.00 Ga) after which S and C isotopic systems remained relatively constant marking a time of Earth system geochemical quiescence. Using these periods, we link changes in S and C isotopes to molecular clock work to aid in interpreting emerging metabolic functions throughout Earth's history while underscoring the need for better proxies for robust evolutionary analyses. Specifically, results indicate: 1) an early development of sulfide oxidation and dissimilatory sulfite reduction followed by disproportionation and then sulfate reduction to sulfite resulting in a fully biologically mediated sulfur cycle by ~ 3.25 Ga; 2) support for the acetyl coenzyme-A pathway as the most likely earliest form of biologically mediated carbon fixation following methanogenesis; 3) an increasingly redox-stratified ocean in the Neoarchean with largely oxic surface water and euxinic bottom water during the first half of the Paleoproterozoic; and 4) that secular changes in Earth system crustal cycling dynamics and continent formation likely played a key role in driving the timing of the GOE. Finally, based on geochemical data, we suggest that the Paleoproterozoic be divided into a new Era of the Eoproterozoic (from 2.45 to 2.00 Ga) and the Paleoproterozoic (from 2.00 to 1.60 Ga).
DS1991-0686
1991
Havinden, M.Havinden, M.The diamond ring -business, politics and precious stones in South 1867-1947. Book by C. NewburyHistory, Vol. 76, No. 247, June pp. 250-251South AfricaBook review, History
DS200812-0455
2008
Haviv, U.Haviv, U.,Lieberman, R.Mergers and acquisitions in the world diamond industry.israelidiamond.co, Sept. 4, 4p.GlobalNews item - BHP and Rio
DS201112-0530
2011
Havlin, A.Kmicek, L., Cempirek, J., Havlin, A., Pfichystal, A., Houzar, S., Kmichkova, M., Gadas, P.Mineralogy and petrogenesis of Ba Ti Zr rich peralkaline dyke from Sebkovice : recognition of the most lamproitic Varascan intrusion.Lithos, Vol. 121, 1-4, pp. 74-86.Europe, Czech RepublicLamproite
DS201312-0371
2013
Havlin, C.Havlin, C., Prmentier, E.M., Hirth, G.Mineral associations in diamonds from the lowermost upper mantle and uppermost lower mantle.Earth and Planetary Science Letters, Vol. 376, pp. 20-28.MantleMelting
DS202011-2049
2020
Havlin, C.Lau, H., Holtzman, B., Havlin, C.Towards a self-consistent characterization of lithospheric plates using full-spectrum viscoelasticity.AGU Advances, dor.or/10.101029 /2020AV000205Mantletectonics

Abstract: On Earth, broken, rigid tectonic plates lie atop slowly flowing mantle rock (over millions to billions of years). A basic understanding of the global variation in thickness of this rigid lid provides the foundation to many geodynamical predictions. However, using different techniques to estimate its thickness, for example, seismic wave propagation (acting on timescales of seconds), to the warping of plates under the weight of volcanoes (acting on timescales of millions of years) reveals many inconsistencies. At the heart of these inconsistencies is the fact that rock deforms differently to forces acting on different timescales. At very fast timescales rock deforms like an elastic solid, but at much longer timescales, rock flows. To resolve these inconsistencies, we attempt to coherently tie these disparate observations together to reach a more holistic understanding of plate thickness, accounting for these timescale effects. By incorporating current understanding on rock deformation from laboratory experiments, we demonstrate that on fast timescales (of the seismic waves used to image the Earth's interior), tectonic plates appear significantly thicker than the true thickness at million? to billion?year timescales of plate tectonics. This demonstration involves a new theoretical and conceptual framework for interpreting distinct observations acting on vastly different timescales.
DS202006-0919
2020
Havranek, R.Flowers, R.M., Macdonald, F.A., Siddoway, C.S., Havranek, R.Diachronous development of Great Unconformities before Neoproterozoic Snowlball Earth. Proceedinds of the National Academy of Sciences, Vol. 117, 19, 9p. PdfUnited States, Coloradogeothermometry

Abstract: The Great Unconformity marks a major gap in the continental geological record, separating Precambrian basement from Phanerozoic sedimentary rocks. However, the timing, magnitude, spatial heterogeneity, and causes of the erosional event(s) and/or depositional hiatus that lead to its development are unknown. We present field relationships from the 1.07-Ga Pikes Peak batholith in Colorado that constrain the position of Cryogenian and Cambrian paleosurfaces below the Great Unconformity. Tavakaiv sandstone injectites with an age of ?676 ± 26 Ma cut Pikes Peak granite. Injection of quartzose sediment in bulbous bodies indicates near-surface conditions during emplacement. Fractured, weathered wall rock around Tavakaiv bodies and intensely altered basement fragments within unweathered injectites imply still earlier regolith development. These observations provide evidence that the granite was exhumed and resided at the surface prior to sand injection, likely before the 717-Ma Sturtian glaciation for the climate appropriate for regolith formation over an extensive region of the paleolandscape. The 510-Ma Sawatch sandstone directly overlies Tavakaiv-injected Pikes granite and drapes over core stones in Pikes regolith, consistent with limited erosion between 717 and 510 Ma. Zircon (U-Th)/He dates for basement below the Great Unconformity are 975 to 46 Ma and are consistent with exhumation by 717 Ma. Our results provide evidence that most erosion below the Great Unconformity in Colorado occurred before the first Neoproterozoic Snowball Earth and therefore cannot be a product of glacial erosion. We propose that multiple Great Unconformities developed diachronously and represent regional tectonic features rather than a synchronous global phenomenon.
DS1997-0489
1997
Hawke, J.Hawke, J.Sierra Leone..overview.. presentation by IMC MacKay and SchnellmannMiga Conference Held Denver June 3-5, 26pSierra LeoneMining, Economics, legal, security
DS1997-0490
1997
Hawke, J.Hawke, J.Sierra Leone..overview.. presentation by IMC MacKay and SchnellmannMiga Conference Held Denver June 3-5, 26p.Sierra LeoneMining, Economics, legal, security
DS2002-1268
2002
Hawke, P.Pirajno, F., Hawke, P.Geophysical character of the Shoemaker impact structurePreview ( Australian Exploration Geophysics Newsletter), Oct. pp. 55-57.AustraliaGeophysics - remote sensing
DS1970-0924
1974
Hawkes, A.L.Hawkes, A.L.Ilmenites from the Zambian KimberlitesLeeds: Msc. Thesis, University Leeds, GlobalMineralogy
DS1970-0090
1970
Hawkes, D.D.Hawkes, D.D.The Geology of Sierra LeoneInternational Conference AFR. GEOL. IBADJAN., PP. 471-482.Sierra Leone, West AfricaGeology
DS1992-0686
1992
Hawkes, D.D.Hawkes, D.D.GOLDFINDER: a knowledge based system for mineral prospectingJournal of Geology Society of London, Vol. 149, No. 3, May pp. 465-472GlobalComputer, Program -GOLDFINDER.
DS201412-0875
2014
Hawkesowrth, C.J.Spencer, C.J., Cawood, P.A., Hawkesowrth, C.J., Raub, T.D., Prave, A.R., Roberts, N.M.W.Proterozoic onset of crustal reworking and collisional tectonics: reappraisal of the zircon oxygen isotope record.Geology, in press availableMantleTectonics
DS1998-0731
1998
HawkesworthKempton, P.D., Hawkesworth, Lopez-Escobar, WareGeochemistry of spinel garnet lherzolite xenoliths from Pali Aike:implications for evolution of mantle...7th International Kimberlite Conference Abstract, pp. 408-10.GlobalLithosphere - mantle, Volcanics
DS1984-0615
1984
Hawkesworth, C.Rogers, N., Hawkesworth, C.New Date for DiamondsNature., Vol. 310, No. 5974, JULY 19TH. PP. 187-188.GlobalGenesis, Origin
DS1985-0497
1985
Hawkesworth, C.Nixon, P.H., Boyd, F.R., Hawkesworth, C.Archaean Harzburgites with Garnet of Diamond Facies from Southern African Kimberlites.Geological Society of America (GSA), Vol. 17, No. 3, P. 186. (ASBTR.).South Africa, LesothoMineral Chemistry, Xenoliths
DS1986-0562
1986
Hawkesworth, C.Menzies, M., Halliday, A., Palacz, Z., Hunter, R., Hawkesworth, C.Barium and light rare earth element (LREE) enriched mantle below the Archean crust of ScotlandProceedings of the Fourth International Kimberlite Conference, Held, No. 16, pp. 294-295ScotlandBlank
DS1990-1006
1990
Hawkesworth, C.McDermott, F., Hawkesworth, C.The evolution of strontium isotopes in the upper continental crustNature, Vol. 344, No. 6269, April 26, pp. 850-853GlobalMantle, Geochronology
DS1992-0510
1992
Hawkesworth, C.Gallagher, K., Hawkesworth, C.Dehydration melting and the generation of continental flood basaltsNature, Vol. 358, no 6381, July 2, pp. 57-59Brazil, NamibiaFlood basalts, Dehydration
DS1994-0566
1994
Hawkesworth, C.Gallagher, K., Hawkesworth, C.Mantle plumes, continental magmatism and asymmetry in the South AtlanticEarth and Planetary Science Letters, Vol. 123, pp. 105-17.GlobalPlumes, Magmatism
DS1994-0743
1994
Hawkesworth, C.Hawkesworth, C., Gallagher, K., Turner, S.Causes of melt generation in the sub-continental mantleMineralogical Magazine, Vol. 58A, pp. 394-395. AbstractMantleMantle plumes, Magma
DS1994-0744
1994
Hawkesworth, C.Hawkesworth, C., Turner, S.The composition of the sub-continental mantle: evidence from magmaticrocks.Mineralogical Magazine, Vol. 58A, pp. 396-397. AbstractMantleMantle plumes, Magma
DS1994-0764
1994
Hawkesworth, C.Hergt, J., Hawkesworth, C.The remobilization of continental mantle lithosphereScience Progress, Vol. 76, pp. 191-207.MantleLithosphere
DS1994-1099
1994
Hawkesworth, C.Mantovani, M.S.M., Stewart, K., Turner, S., Hawkesworth, C.Duration of Parana magmatism and implications for the evolution and source regions of cont. flood basalts.International Symposium Upper Mantle, Aug. 14-19, 1994, Extended abstracts pp. 47-48.BrazilMagma, Flood basalts
DS1995-1593
1995
Hawkesworth, C.Rogers, N.W., Hawkesworth, C.Late Cenozoic basaltic magmatism in the western Great Basin, California andNevada.Journal of Geophysical Research, Vol. 100, No. B6, June 10, pp. 10, 287-10, 302.CaliforniaMagmatism
DS1995-1938
1995
Hawkesworth, C.Turner, S., Hawkesworth, C.The nature of the subcontinental mantle: constraints -major element composition continental flood basaltsChemical Geology, Vol. 120, pp. 295-314MantleProterozoic, Basalts -flood
DS1996-0481
1996
Hawkesworth, C.Garland, F., Turner, S., Hawkesworth, C.Shifts in the source of the Parana basalts through timeLithos, Vol. 37, No. 2/3, April pp. 223-244BrazilBasalts -Parana, Geochemistry
DS1996-1448
1996
Hawkesworth, C.Turner, S., Hawkesworth, C., et al.Mantle plumes, flood basalts, and thermal models for melt generation beneath continents: assessment ParanaJournal of Geophysical Research, Vol. 181, No. B5, May. 10, pp. 11, 503-518BrazilMantle plumes, Flood basalts
DS1997-1176
1997
Hawkesworth, C.Turner, S., Foden, J., Hawkesworth, C.State of the Arc'97 Island Arc magma genesis workshopGeol. Society of Australia Abstracts, No. 45, 115p. approx. 50.00AustraliaBook - table of contents, Island arc magma
DS1998-0598
1998
Hawkesworth, C.Hawkesworth, C., Kelley, S., Turner, S., Le Roex, A.Mantle processes during Gondwana break up and dispersalJournal of African Earth Sciences, Vol. 27, 1A, p. 108. AbstractGondwanaTectonics
DS200412-1747
2004
Hawkesworth, C.Schersten, A., Elliott, T., Hawkesworth, C., Norman, M.Tungsten isotope evidence that mantle plumes contain no contribution from the Earth's core.Nature, No. 6971, pp. 234-6.MantleGeochronology, plumes
DS200512-0409
2005
Hawkesworth, C.Hawkesworth, C.Geochemistry and mantle plumes.Chapman Conference held in Scotland August 28-Sept. 1 2005, 1p. abstractMantleMantle plume, geochemistry
DS200612-0549
2005
Hawkesworth, C.Hawkesworth, C., Kemp, T.Using hafnium and oxygen isotopes in zircons to unravel the record of crustal evolution.Chemical Geology, Vol. 226, 3-4, pp. 144-162.AustraliaGeochronology
DS200612-0550
2006
Hawkesworth, C.Hawkesworth, C., Kemp, T.A zircon perspective on the evolution of the continental crust: insights from combined Hf and O isotopes.Geochimica et Cosmochimica Acta, Vol. 70, 18, 1, p. 16, abstract only.MantleGeochronology
DS200712-0423
2007
Hawkesworth, C.Hawkesworth, C., Kemp, T.The generation and evolution of the continental crust.Plates, Plumes, and Paradigms, 1p. abstract p. A387.MantleGeochronology - zircon
DS200912-0287
2009
Hawkesworth, C.Hawkesworth, C., Storey, C., Dhuime, B., Marschall, H., Pietranik, A., Kemp, T.The generation, evolution and preservation of the continental crust.Goldschmidt Conference 2009, p. A505 Abstract.MantleZircon geochronology
DS201012-0663
2010
Hawkesworth, C.Sarkar, C., Storey, C., Hawkesworth, C., Sparks, S., Field, M.Fingerprinting of kimberlite sources by isotope studies of accessory minerals: a mantle tracer.Goldschmidt 2010 abstracts, P. 553. abstractTechnologyGeochronology, perovskites
DS201012-0759
2010
Hawkesworth, C.Storey, C., Hawkesworth, C., Condon, D.An early REE fractionated mantle?Goldschmidt 2010 abstracts, AbstractMantleREE
DS201112-0420
2011
Hawkesworth, C.Hawkesworth, C., Cawood, P., Dhuime, B.The generation and evolution of the continental crust.Goldschmidt Conference 2011, abstract p.993.MantleSubduction zones
DS201212-0654
2012
Hawkesworth, C.Shumlyansky, L.,Billstrom, K., Hawkesworth, C., Elming, S-A.U Pb age and Hf isotope compositions of zircons from the north western region of the Ukrainain shield: mantle melting in response to post extension.Terra Nova, Vol. 24, 5, pp. 373-379.EuropeMelting
DS201312-0206
2013
Hawkesworth, C.Dhuime, B., Hawkesworth, C., Cawood, P.The composition of the new continental crust through time.Goldschmidt 2013, AbstractMantleSubduction
DS201312-0872
2013
Hawkesworth, C.Spencer, C.J., Hawkesworth, C., Cawood, P.A., Dhuime, B.Not all supercontinents are created equal: Gondwana-Rodinia case study.Geology, Vol. 41, pp. 795-798.Gondwana, RodiniaGondwana
DS201607-1338
2016
Hawkesworth, C.Daly, M., Hawkesworth, C.Tectonic influences on the development of the continental crust.IGC 35th., Session A Dynamic Earth 1 p. abstractMantleTectonics
DS201709-1996
2017
Hawkesworth, C.Hawkesworth, C., Cawood, P., Dhuime, B., Kemp, T.I.S.Earth's continental lithosphere through time.Annual Review of Earth and Planetary Sciences, Vol. 45, pp. 169-198.Mantletectonics

Abstract: The record of the continental lithosphere is patchy and incomplete; no known rock is older than 4.02 Ga, and less than 5% of the rocks preserved are older than 3 Ga. In addition, there is no recognizable mantle lithosphere from before 3 Ga. We infer that there was lithosphere before 3 Ga and that ?3 Ga marks the stabilization of blocks of continental lithosphere that have since survived. This was linked to plate tectonics emerging as the dominant tectonic regime in response to thermal cooling, the development of a more rigid lithosphere, and the recycling of water, which may in turn have facilitated plate tectonics. A number of models, using different approaches, suggest that at 3 Ga the volume of continental crust was ?70% of its present day volume and that this may be a minimum value. The continental crust before 3 Ga was on average more mafic than that generated subsequently, and this pre-3 Ga mafic new crust had fractionated Lu/Hf and Sm/Nd ratios as inferred for the sources of tonalite-trondhjemite-granodiorite and later granites. The more intermediate composition of new crust generated since 3 Ga is indicated by its higher Rb/Sr ratios. This change in composition was associated with an increase in crustal thickness, which resulted in more emergent crust available for weathering and erosion. This in turn led to an increase in the Sr isotope ratios of seawater and in the drawdown of CO2. Since 3 Ga, the preserved record of the continental crust is marked by global cycles of peaks and troughs of U-Pb crystallization ages, with the peaks of ages appearing to match periods of supercontinent assembly. There is increasing evidence that the peaks of ages represent enhanced preservation of magmatic rocks in periods leading up to and including continental collision in the assembly of supercontinents. These are times of increased crustal growth because more of the crust that is generated is retained within the crust. The rates of generation of continental crust and mantle lithosphere may have remained relatively constant at least since 3 Ga, yet the rates of destruction of continental crust have changed with time. Only relatively small volumes of rock are preserved from before 3 Ga, and so it remains difficult to establish which of these are representative of global processes and the extent to which the rock record before 3 Ga is distorted by particular biases.
DS201709-1997
2017
Hawkesworth, C.Hawkesworth, C., Kendall, M., Daly, M., Cawood, P., Dhuime, B.Within plate and subduction related settings in the Archean.Goldschmidt Conference, abstract 1p.Mantlesubduction

Abstract: There is much discussion of the timing of the onset of plate tectonics, yet there is increasing evidence that magma types similar to those from recent within plate and subduction related settings were generated in different areas at broadly similar times in the early Archaean. It may therefore be helpful to consider when plate tectonics became the dominant mechanism associated with the generation of continental crust, rather than just when it started. To do this we discuss the geochemical and mechanical characteristics of the lithosphere in the search to discern differences between Early Archaean and younger tectonic environments. Seismic tomography allows increasingly detailed mapping of the lithosphere, and it provides some evidence that the degree of anisotropy is different in different Archaean terrains. Structural styles also appear to vary from basin and swell, or vertical tectonics, as in the Australia Pilbara and southern Africa, to those with more strongly developed regional fabrics and greater seismic anisotropy, as in North America. These terrains tend to be characterized by inferred within-plate and subduction-related magmatism respectively, and we consider possible links between the degree of crustal and mantle anisotropy and the nature of the magmatic record. At least in some areas, terrains with stronger regional fabrics may be younger than those in which such fabrics are less well developed. A model is developed for the generation and stabilization of continental lithosphere in the Archaean. It seeks to reconcile evidence for hot shallow melting with melt fractions up to 40% to generate residual peridotites now preserved as mantle xenoliths, and the lower degrees of melting required to generate the mafic sources of TTGs (fractionated Lu/Hf and Sm/Nd, and perhaps not Rb/Sr).
DS1993-1209
1993
Hawkesworth, C.JPeate, D.W., Hawkesworth, C.J, Mantovani, M.SM.Chemical stratigraphy of the Parana lavas (South America): classification of magma types and their spatial distributionBulletin Volcanology, Vol. 55, pp. 119-139South AmericaFlood basalts, Geochemistry
DS1981-0284
1981
Hawkesworth, C.J.Marsh, J.S., Hawkesworth, C.J., Moore, A.E.Strontium and Neodymium Isotopes in Tertiary Alkaline Volcanics in South western Africa.Geocongress '81 Open Session., ABSTRACT VOLUME, PP. 33-35.South AfricaNamaqualand, Melilitite, Spiegel River, Klaasvoogds, Garies
DS1982-0194
1982
Hawkesworth, C.J.Erlank, A.J., Allsopp, H.L., Hawkesworth, C.J., Menzies, M.A.Chemical and Isotopic Characterisation of Upper Mantle Metasomatism in Peridotite Nodules from the Bultfontein Kimberlite.Proceedings of Third International Kimberlite Conference, TERRA COGNITA, ABSTRACT VOLUME., Vol. 2, No. 3, PP. 261-263, (abstract.).South AfricaKimberlite
DS1982-0265
1982
Hawkesworth, C.J.Hawkesworth, C.J., Rogers, N.W., Van calsteren, P.W., Menzies.Neodymium and Strontium Isotope Studies on Crustal Xenoliths from southernafrica.Proceedings of Third International Kimberlite Conference, TERRA, Vol. 2, No. 3, P. 236, (abstract.).South Africa, LesothoKimberlite, Geochronology
DS1982-0526
1982
Hawkesworth, C.J.Rogers, N.W., Hawkesworth, C.J.Proterozoic Age and Cumulate Origin for Granulite Xenoliths, Lesotho.Nature., Vol. 299, No. 5882, PP. 409-412.LesothoKimberlite, Geochronology, Genesis
DS1982-0527
1982
Hawkesworth, C.J.Rogers, N.W., Hawkesworth, C.J.Proterozoic Age and Cumulate Origin for Granulite Xenoliths, LesothoNature, Vol. 299, No. 5882, October 6th. pp. 409-413LesothoBlank
DS1983-0295
1983
Hawkesworth, C.J.Hawkesworth, C.J., Menzies, M.A.Kimberlites RevisitedNature., Vol. 302, No. 5907, PP. 380-381.GlobalOrigin, Genesis
DS1983-0296
1983
Hawkesworth, C.J.Hawkesworth, C.J., Norry, M.J.Continental Basalts and Mantle XenolithsCheshire: Shiva Publishing, 272P.GlobalGeology, Kimberley, Genesis
DS1983-0449
1983
Hawkesworth, C.J.Menzies, M.A., Leeman, W.P., Hawkesworth, C.J.Isotope Geochemistry of Cenozoic Volcanic Rocks Reveals Mantle Heterogeneity Below Western UsaNature., Vol. 303, No. 5914, PP. 205-209.United StatesGenesis, Geochemistry
DS1984-0349
1984
Hawkesworth, C.J.Hawkesworth, C.J., Rogers, N.W., Van calsteren, P.W.C., Menzies.Mantle Enrichment ProcessesNature., Vol. 311, No. 6984, SEPT. 27TH. PP. 331-335.GlobalBasanite, Kimberlite, Genesis
DS1985-0201
1985
Hawkesworth, C.J.Fraser, K.J., Hawkesworth, C.J., Erlank, A.J., Mitchell, R.H.Strontium, neodymium, and lead isotope and minor element geochemistry of lamproites and kimberlitesEarth and Planetary Science Letters, Vol. 76, pp. 57-70Australia, MontanaMineral Chemistry, Lamproite
DS1985-0275
1985
Hawkesworth, C.J.Hawkesworth, C.J., Fraser, K.J., Rogers, N.W.Kimberlites and lamproites: extreme products of mantleenrichmentprocessesTransactions Geological Society of South Africa, Vol. 88, pt. 2, May-August pp. 439-447AustraliaLamproites, Review
DS1986-0218
1986
Hawkesworth, C.J.Erlandk, A.J., Waters, F.G., Haggerty, S.E., Hawkesworth, C.J.Characterisation of metasomatic processes in peridotite nodules contained in kimberlitesProceedings of the Fourth International Kimberlite Conference, Held Perth, Australia, No. 16, pp. 232-234South AfricaBlank
DS1986-0219
1986
Hawkesworth, C.J.Erlank, A.J., Waters, F.G., Hawkesworth, C.J., Haggerty, S.E.Evidence for mantle metasomatism in peridotite nodules from the Kimberleypipes, South Africain: Menzies, M.A., Hawkesworth, C.J. editors Mantle Metasomatism, Academic, pp. 221-312South AfricaMetasomatism
DS1986-0255
1986
Hawkesworth, C.J.Fraser, K.J., Hawkesworth, C.J.Kimberlite/lamproite petrogenesis: geochemical and isotope evidence from North America, South Africa and Western AustraliaProceedings of the Fourth International Kimberlite Conference, Held Perth, Australia, No. 16, pp. 176-177Australia, Wyoming, Montana, South AfricaLamproite, Leucite Hills, Smoky Butt
DS1986-0349
1986
Hawkesworth, C.J.Hawkesworth, C.J., Van Calsteren, P., Palacz, Z., Rogers, N.W.Crustal xenoliths from southern Africa: chemical and age variations within the continental crustProceedings of the Fourth International Kimberlite Conference, Held Perth, Australia, No. 16, pp. 253-255South Africa, LesothoBlank
DS1987-0188
1987
Hawkesworth, C.J.Erlank, A.J., Haggerty, S.E., Hawkesworth, C.J., Waters, F.G.Lithospheric metasomatism beneath Southern AfricaTerra Cognita, Conference abstracts Oceanic and Continental Lithosphere:, Vol. 7, No. 4, Autumn, abstract only p. 612Southern AfricaBlank
DS1987-0281
1987
Hawkesworth, C.J.Hawkesworth, C.J., Kempton, P.D., Palacz, Z., Rogers, N.W.Mantle lithosphere as a source of continental flood basaltsEos, Vol. 68, No. 44, November 3, p. 1549. abstract onlyGlobalBlank
DS1987-0282
1987
Hawkesworth, C.J.Hawkesworth, C.J., Van Calsteren, P., Rogers, N.W., Menzies, M.A.Isotope variations in recent volacnics: a trace element perspectiveIn: Mantle Metasomatism, edited M.A. Menzies, C.J. Hawkesworth, Academic, pp. 365-388GlobalBlank
DS1987-0416
1987
Hawkesworth, C.J.Lightfoot, P.C., Naldrett, A.J., Hawkesworth, C.J.Re-evaluation of chemical variation in the Insizwa complex, TranskeiCanadian Mineralogist, Vol. 25, pt. 1, pp. 79-90South AfricaPetrology, Picrite
DS1987-0467
1987
Hawkesworth, C.J.Menzies, M.A., Hawkesworth, C.J.Mantle MetasomatismAcademic Press, 465pGlobalAlkaline Magma, Mantle genesis
DS1987-0468
1987
Hawkesworth, C.J.Menzies, M.A., Hawkesworth, C.J.Upper mantle processes and compositionin: Nixon, P.H. ed. Mantle xenoliths, J. Wiley, pp. 725-738GlobalBlank
DS1987-0469
1987
Hawkesworth, C.J.Menzies, M.A., Rogers, N., Tindle, A., Hawkesworth, C.J.Metasomatic and enrichment processes in lithospheric peridotites, an effectof asthenosphere-lithosphere interactionIn: Mantle Metasomatism, edited M.A. Menzies, C.J. Hawkesworth, Academic, pp. 313-364GlobalBlank
DS1987-0532
1987
Hawkesworth, C.J.Nixon, P.H., Van Calsteren, P.W.C., Boyd, F.R., Hawkesworth, C.J.Harzburgites with garnets of diamond facies from southernAfricankimberlitesin: Nixon, P.H. ed. Mantle xenoliths, J. Wiley, pp. 523-534South Africap. 527 analyses
DS1987-0620
1987
Hawkesworth, C.J.Rogers, N.W., Hawkesworth, C.J., Mattey, D.P., Harmon, R.S.Sediment subduction and the source of potassium in orogenic leucititesGeology, Vol. 15, No. 5, May pp. 451-453GlobalLeucite, Ultrapotassic rocks
DS1988-0199
1988
Hawkesworth, C.J.Ellam, R.M., Hawkesworth, C.J.Is average continental crust generated at subduction zones?Geology, Vol. 16, No. 4, April pp. 314-317ZimbabweMagmas, Crust
DS1988-0293
1988
Hawkesworth, C.J.Hawkesworth, C.J., Kempton, P.D., Mattey, D.P., Palacz, Z.A., Rogers, N.W.Intra-mantle fractionation VS lithosphere recycling:evidence from the sub-continental mantleD. Reidel Publishing Co., Nato Series, Asi C, Math. Phys. Sci., Vol., pp. 227-237Southern AfricaIsotopes- kimberlites, lamproites, Mid Ocean Ridge Basalt (MORB).
DS1988-0294
1988
Hawkesworth, C.J.Hawkesworth, C.J., Mantovani, M., Peate, D.Lithospheric remobilization during Parana CFB magmatismJournal of Petrology, Special Volume 1988- Oceanic and Continental, pp. 205-224Brazil, Paraguay, ArgentinaMantle, Chemistry
DS1988-0348
1988
Hawkesworth, C.J.Kempton, P.D., Hawkesworth, C.J., Van Calsteren, P., Moorbath, S.Evidence for Cenozoic underplating of the lower crust: isotopic andTerra Cognita, Eclogite conference Abstracts, Vol. 8, No. 3, Summer, p. 271. AbstractArizonaMantle, Geronimo
DS1989-0595
1989
Hawkesworth, C.J.Harte, B., Hawkesworth, C.J.Mantle domains and mantle xenolithsGeological Society of Australia Inc. Blackwell Scientific Publishing, Special, No. 14, Vol. 2, pp. 649-686GlobalReview paper -mantle xenoliths, Xenoliths
DS1989-0982
1989
Hawkesworth, C.J.McDermott, F., Harris, N.B.W., Hawkesworth, C.J.Crustal reworking in southern Africa: constraints from Sr-neodymium isotope studies in Archean to Pan-AfricanterrainsTectonophysics, Vol. 161, No. 3/4, pp. 257-270South AfricaGeochronology, Tectonics
DS1989-1298
1989
Hawkesworth, C.J.Rogers, N.W., Ellam, R.M., Peate, D.W., Hawkesworth, C.J.Potassic mafic rocks from the Virunga and the Karoo and the composition Of the subcontinental mantleNew Mexico Bureau of Mines Bulletin., Continental Magmatism Abstract Volume, Held, Bulletin. No. 131, p. 225 Abstract held June 25-July 1Central AfricaTectonics, Rift
DS1989-1299
1989
Hawkesworth, C.J.Rogers, N.W., Hawkesworth, C.J., Ormerod, D.S., Kempton, P.D.Sampling the lithosphere. Discussion and replyNature, Vol. 342, December 14, p. 743GlobalMantle, Xenoliths
DS1990-0442
1990
Hawkesworth, C.J.Ellam, R.M., Hawkesworth, C.J., McDermott, F.lead isotope dat a from late Proterozoic subduction related rocks:implications for crust-mantle evolutionChem. Geol, Vol. 83, No. 3/4, June 25, pp. 165-181Saudi ArabiaMantle, Geochronology
DS1990-0677
1990
Hawkesworth, C.J.Hawkesworth, C.J., Erlank, A.J., Kempton, P.D., Waters, F.G.Mantle metasomatism: isotope and trace element trends in xenoliths fromKimberley, South AfricaChemical Geology, Vol. 85, No. 1/2, July 10, pp. 19-34South AfricaKimberley deposit, Geochronology
DS1990-0678
1990
Hawkesworth, C.J.Hawkesworth, C.J., Kempton, P.D., Rogers, N.W., Ellam, R.M.Continental mantle lithosphere, and shallow level enrichment processes In the earth's mantleEarth and Planetary Science Letters, Vol. 96, No.3-4, pp. 256-268South AfricaMantle, Xenoliths, lamproites, kimb
DS1990-0821
1990
Hawkesworth, C.J.Kempton, P.D., Harmon, R.S., Hawkesworth, C.J., Moorbath, S.Petrology and geochemistry of lower crustal granulites from the Geronimo volcanic field, southeastern ArizonaGeochimica et Cosmochimica Acta, Vol. 54, pp. 3401-3426ArizonaMantle, Geochemistry
DS1990-1142
1990
Hawkesworth, C.J.Ormerod, D.S., Rogers, N.W., Hawkesworth, C.J.Coherent melting relationships in the lithospheric mantle by inverse modelling of alkali basaltsV.m. Goldschmidt Conference Held May 2-4, 1990, Program And Abstract, p. 71. Abstract onlyGlobalMantle, Geochemistry
DS1991-0687
1991
Hawkesworth, C.J.Hawkesworth, C.J., Hergt, J.M., Ellam, R.M., McDermott, F.Element fluxes associated with subduction related magmatismPhil. Transactions R. Soc. London, Sect. A., Vol. 335, pp. 393-405GlobalGeochemistry -rare earths, Isotopes
DS1991-0688
1991
Hawkesworth, C.J.Hawkesworth, C.J., Hergt, J.M., McDermott, F., Ellam, R.M.Destructive margin magmatism and the contributions from the mantle wEdge and subducted crustAustralian Journal of Earth Sciences, Vol. 38, December pp. 577-594AustraliaMantle, Subduction
DS1991-1273
1991
Hawkesworth, C.J.Osmerod, D.S., Rogers, N.W., Hawkesworth, C.J.Melting in the lithospheric mantle: inverse modelling of alkali-olivinebasalts from the Big Pine volcanic field, CaliforniaContributions to Mineralogy and Petrology, Vol. 108, pp. 305-317CaliforniaMantle, Basalts
DS1992-0161
1992
Hawkesworth, C.J.Brewer, T.S., Hergt, J.M., Hawkesworth, C.J., et al.Coats Land dolerites and the generation of Antarctic continental floodbasaltsGeological Society Special Publication Magmatism and the causes of the continental, No. 68, pp. 185-208AntarcticaBasalts, Geochemistry, signatures
DS1992-0486
1992
Hawkesworth, C.J.Fraser, K.J., Hawkesworth, C.J.The petrogenesis of Group-2 ultrapotassic kimberlites from Finsch mine, South-AfricaLithos, Vol. 28, No. 3-6. November pp. 327-345South AfricaPetrology, Ultrapotassic kimberlite
DS1992-1290
1992
Hawkesworth, C.J.Rogers, N.W., Demulder, M., Hawkesworth, C.J.An enriched mantle source for potassic basanites- evidence from Karisimbivolcano, Virunga volcanic province, RwandaContributions to Mineralogy and Petrology, Vol. 111, No. 4, September pp. 543-556GlobalBasanite
DS1992-1291
1992
Hawkesworth, C.J.Rogers, N.W., Hawkesworth, C.J., Palacz, Z.A.Phlogophite in the generation of olivine melilitites from Namaqualand, South Africa and implications for element fractionation processes in the uppermantle.Lithos, Vol. 28, No. 3-6. November pp. 347-365.South AfricaMelilitites, Petrology
DS1993-0643
1993
Hawkesworth, C.J.Hawkesworth, C.J., Gallagher, K., et al.Mantle hotspots, plumes and regional tectonics as causes of intraplatemagmatism.Terra Nova, Vol. 5, No. 6, pp. 552-559.MantleHot spots, subduction, melting, Tectonics
DS1993-0644
1993
Hawkesworth, C.J.Hawkesworth, C.J., Gallagher, K., Hergt, J.M., McDermott, F.Trace element fractionation processes in the generation of island arcbasaltsRoyal Society Transactions, Physical Sciences, Ser. A, Vol. 342, No. 1663, January 15, pp. 179-191MantleSubduction, Magmas
DS1994-0543
1994
Hawkesworth, C.J.Francis, P.W., Hawkesworth, C.J.Late Cenozoic rates of magmatic activity in the Central Andes and their relationship to crustal thickeningJournal of the Geological Society of London, Vol. 151, pt. 5, Sept. pp. 845-854Andes, ChileMagma, Crustal thickening
DS1994-0745
1994
Hawkesworth, C.J.Hawkesworth, C.J., Gallagher, K., Hergt, J.M., McDermottDestructive plate margin magmatism: geochemistry and melt generationLithos, Vol. 33, No. 1-3, October pp. 169-188.MantleGeotectonics, geodynamics, Geochemistry
DS1994-1061
1994
Hawkesworth, C.J.Luais, B., Hawkesworth, C.J.The generation of continental crust: an integrated study of crust forming processes in the Archean of Zimbabwe.Journal of Petrology, Vol. 35, No. 1, pp. 43-93.ZimbabweCraton, Tectonics
DS1995-0774
1995
Hawkesworth, C.J.Hawkesworth, C.J., Lightfoot, P.C., Fedorenko, V.A.Magma differentiation and mineralization in the Siberian continental floodbasaltsLithos, Vol. 34, No. 1-3, Jan. pp. 61-88Russia, SiberiaMagmatism, Flood basalts
DS1995-0828
1995
Hawkesworth, C.J.Huang, Y.M., Hawkesworth, C.J., Calsteren, P.van.Geochemical characteristics and origin of the Jacupiranga carbonatitesChemical Geology, Vol. 119, No. 1-4, Jan. 5, pp. 79-100.BrazilGeochemistry, Carbonatite
DS1995-0829
1995
Hawkesworth, C.J.Huang, Y.-M., Van Calsteren, P., Hawkesworth, C.J.The evolution of the lithosphere in southern Africa: a perspective on basic granulite xenoliths - kimberlitesGeochim. Cosmochimica Acta, Vol. 59, No. 23, Dec. 1, pp. 4905-4920.South Africa, BotswanaXenoliths, Kimberlites
DS1996-1090
1996
Hawkesworth, C.J.Peate, D.W., Hawkesworth, C.J.Lithospheric to asthenospheric transition in low Ti flood basalts From southern Parana, BrasilChemical Geology, Vol. 127, No. 1-3, Jan. 10, pp. 1-24BrazilBasalts, Xenoliths, Geochemistry
DS1997-0491
1997
Hawkesworth, C.J.Hawkesworth, C.J., et al.Uranium-Th isotopes in arc magmas: implications for element transfer from the subducted crust.Science, Vol. 276, Apr. 25, pp. 551-55.MantleSubduction, melting, Geochronology
DS1997-0680
1997
Hawkesworth, C.J.Lightfoot, P.C., Hawkesworth, C.J., Keays, R.R.Geochemistry of Tertiary tholeiites and picrites from Qeqertarssuaq(Diskoisland) and Nuussuaq..Contributions to Mineralogy and Petrology, Vol. 128, No. 2/3, pp. 139-163GreenlandComagmatic layered intrusions, Metallogeny
DS2000-0394
2000
Hawkesworth, C.J.Hawkesworth, C.J., Gallagher, K., Turner, S.P.Tectonic controls on magmatism associated with continental break up: an example from Parana-Etendeka.Earth and Planetary Science Letters, Vol. 179, No. 2, June 30, pp. 335-50.BrazilTectonics, Magmatism
DS2001-0607
2001
Hawkesworth, C.J.Kirstein, L.A., Hawkesworth, C.J., Garland, F.G.Felsic lavas or rheomorphic ignimbrites: is there a chemical distinction?Contributions to Mineralogy and Petrology, Vol. 142, No. 3, Dec. pp. 309-22.GlobalIgnimbrites - geochemistry
DS2002-0474
2002
Hawkesworth, C.J.Fowler, C.M.R., Ebinger, C., Hawkesworth, C.J.The Early Earth: physical, chemical and biological developmentGeological Society of London (U.K.), 352p.$ 142.00 http://bookshop.geolsoc.org.ukMantleBook - tectonics, deformation, lithosphere, Geophysics, models, plumes
DS2002-0475
2002
Hawkesworth, C.J.Fowler, C.M.R., Ebinger, C.J., Hawkesworth, C.J.The early Earth: physical, chemical and biological developmentsGeological Society of London Special Publication, No. 199, 352p. $ 142. http://bookshop.geolsoc.org.ukBookArchean lithosphere, petrology, geophysics, structure, craton - evolution, models, environment
DS200512-0833
2005
Hawkesworth, C.J.Peate, D.W., Hawkesworth, C.J.U series disequilibria: insights into mantle melting and the timescales of magma differentiation.Reviews of Geophysics, Vol. 43, 1, March 31, RG 1003MantleMelt, metasomatism
DS200612-0551
2006
Hawkesworth, C.J.Hawkesworth, C.J., Kemp, A.I.S.The differentiation and rates of generation of the continental crust.Chemical Geology, Vol. 226, 3-4, pp. 134-143.MantleTectonics
DS200612-0684
2006
Hawkesworth, C.J.Kemp, A.J.S., Hawkesworth, C.J., Paterson, B.A., Foster, G.L., Woodhead, J.D., Hergt, J.M., Wormald, R.J.The case of crust mantle interaction during silicic magma genesis: the zircon testimony.Geochimica et Cosmochimica Acta, Vol. 70, 18, 1, p. 12, abstract only.MantleMagmatism
DS200812-0491
2008
Hawkesworth, C.J.Humphreys, E.R., Bailey, K., Wall, F., Hawkesworth, C.J., Kearms, S.Highly heterogeneous mantle sampled by rapidly erupted carbonate volcanism.9IKC.com, 3p. extended abstractEurope, ItalyCalatrava volcanic province
DS200812-0898
2008
Hawkesworth, C.J.Pietranik, A.B, Hawkesworth, C.J., Storey, C.D., Kemp, T.I.S., Sircombe, Whitehouse, BleekerEpisodic, mafic crust formation in the Slave Craton, Canada.Goldschmidt Conference 2008, Abstract p.A748.Canada, Northwest TerritoriesMantle zircons
DS200812-0899
2008
Hawkesworth, C.J.Pietranik, A.B., Hawkesworth, C.J., Storey, C.D., Kemp, A.I.S., Sircombe, K.N., Whitehouse, M.J., Bleeker, W.Episodic mafic crust formation from 4.5 to 2.8 Ga: new evidence from detrital zircons, Slave craton, Canada.Geology, Vol. 36, 11, pp. 875-878.Canada, Northwest TerritoriesGeochronology
DS200912-0320
2009
Hawkesworth, C.J.Humphreys, E.R., Bailey, K., Hawkesworth, C.J., Wall, F.Carbonate inclusions in mantle olivines: mantle carbonatite.Goldschmidt Conference 2009, p. A564 Abstract.Europe, SpainLeucitites
DS201012-0271
2010
Hawkesworth, C.J.Hawkesworth, C.J.,Dhuime, B., Pietranik, A.B., Cawood, P.A., kemp, A.I.S., Storey, C.D.The generation and evolution of the continental crust.Journal of the Geological Society, Vol. 167, 3, March pp. 229-248.MantleReview
DS201012-0297
2010
Hawkesworth, C.J.Humprhreys, E.R., Bailey, K., Hawkesworth, C.J., Wall, F., Najorka, J., Rankin, A.H.Aragonite in olivine from Calatrava, Spain - evidence for mantle carbonatite melts from > 100km depth.Geology, Vol. 38, 10, pp. 911-914.Europe, SpainCarbonatite
DS201012-0346
2010
Hawkesworth, C.J.Kasemann, S.A., Prave, A.R., Fallick, A.E., Hawkesworth, C.J., Hoffmann, K-H.Neoproterozoic ice ages, boron isotopes, and ocean acidification: implications for a snowball Earth.Geology, Vol. 38, 9, pp. 775-778.MantleSnowball Earth
DS201112-0268
2011
Hawkesworth, C.J.Dhume, B., Hawkesworth, C.J., Cawood, P.A., Storey, C.D., Sircombe, K.N.Growth and reworking of Gondwana through time.Goldschmidt Conference 2011, abstract p.755.AustraliaTectonics
DS201112-0566
2011
Hawkesworth, C.J.Lamcaster, P.J., Storey, C.D., Hawkesworth, C.J., Dhuime, B.Understanding the roles of crustal growth and preservation in the detrital zircon record.Earth and Planetary Science Letters, In press, availableMantleGeochronology
DS201112-0568
2011
Hawkesworth, C.J.Lancaster, P.J., Storey, C.D., Hawkesworth, C.J., Dhuime, B.Understanding the roles of crustal growth and preservation in the detrital zircon record.Earth and Planetary Science Letters, Vol. 305, 3-4, pp. 405-412.MantleGeochronology
DS201112-0914
2011
Hawkesworth, C.J.Sarkar, C., Storey, C.D., Hawkesworth, C.J., Sparks, R.S.J.Degassing in kimberlite: oxygen isotope ratios in perovskites from explosive and hypabyssal kimberlites.Earth and Planetary Science Letters, Vol. 312, 3-4, pp. 291-299.Africa, Botswana, South AfricaDeposit - Orapa, Wesselton
DS201112-0915
2011
Hawkesworth, C.J.Sarkar, C., Storey, C.D., Hawkesworth, C.J., Sparks, R.S.J.Oxygen isotopes in perovskites from kimberlites.Goldschmidt Conference 2011, abstract p.1798.Africa, Botswana, South AfricaOrapa, Wesselton
DS201212-0160
2012
Hawkesworth, C.J.Dhuime, B., Hawkesworth, C.J., Cawood, P.A., Storey, C.D.A change in the geodynamics of continental growth 3 billion years ago.Science, Vol. 335, 6074, March 16, pp. 1334-1336.MantleSubduction - driven plate tectonics
DS201212-0623
2012
Hawkesworth, C.J.Sarkar, C., Storey, C.D., Hawkesworth, C.J., Sparks, R.S.J.Trace element nd isotope geochemistry of perovskite from kimberlites of southern Africa.10th. International Kimberlite Conference Feb. 6-11, Bangalore India, AbstractAfrica, South AfricaGeochemistry
DS201312-0131
2013
Hawkesworth, C.J.Cawood, A., Hawkesworth, C.J., Dhuime, B.The continental record and the generation of continental crust.Geological Society of America Bulletin, Vol. 125, pp. 14-32.MantleGeochronology
DS201312-0779
2014
Hawkesworth, C.J.Sarkar, C., Storey, C.D., Hawkesworth, C.J.Using perovskite to determine the pre-shallow level contamination magma characteristics of kimberlite.Chemical Geology, Vol. 363, pp. 76-90.Africa, South Africa, BotswanaDeposit - Wesselton, Orapa
DS201412-0108
2014
Hawkesworth, C.J.Cawood, P., Hawkesworth, C.J., Dhuime, B.The orgin of the continental crust and its impact on the Earth system.Goldschmidt Conference 2014, abstractGondwana, RodiniaPlate Tectonics
DS201502-0049
2015
Hawkesworth, C.J.Cawood, P., Hawkesworth, C.J.Temporal relations between mineral deposits and global tectonic cycles.In: Ore deposits of an evolving Earth, Geological Society of London,, Special Publication no. 393, pp. 9-21.GlobalTectonics

Abstract: Mineral deposits are heterogeneously distributed in both space and time, with variations reflecting tectonic setting, evolving environmental conditions, as in the atmosphere and hydrosphere, and secular changes in the Earth’s thermal history. The distribution of deposit types whose settings are tied to plate margin processes (e.g. orogenic gold, volcanic-hosted massive sulphide, Mississippi valley type Pb-Zn deposits) correlates well with the supercontinent cycle, whereas deposits related to intra-cratonic settings and mantle-driven igneous events, such as Ni-Cu-PGE deposits, lack a clear association. The episodic distribution of deposits tied to the supercontinent cycle is accentuated by selective preservation and biasing of rock units and events during supercontinent assembly, a process that encases the deposit within the assembled supercontinent and isolates it from subsequent removal and recycling at plate margins.
DS201508-0349
2015
Hawkesworth, C.J.Dhuime, B., Wuestefeld, A., Hawkesworth, C.J.Emergence of modern continental crust about 3 billion years ago.Nature Geoscience, Vol. 8, pp. 552-555.MantleGeochronology Rb/Sr
DS201609-1720
2016
Hawkesworth, C.J.Hawkesworth, C.J., Cawood, P.A., Dhuime, B.Tectonics and crustal evolution.GSA Today, Vol. 26, 9, 9p.MantleStages of subduction

Abstract: The continental crust is the archive of Earth’s history. Its rock units record events that are heterogeneous in time with distinctive peaks and troughs of ages for igneous crystallization, metamorphism, continental margins, and mineralization. This temporal distribution is argued largely to reflect the different preservation potential of rocks generated in different tectonic settings, rather than fundamental pulses of activity, and the peaks of ages are linked to the timing of supercontinent assembly. Isotopic and elemental data from zircons and whole rock crustal compositions suggest that the overall growth of continental crust (crustal addition from the mantle minus recycling of material to the mantle) has been continuous throughout Earth’s history. A decrease in the rate of crustal growth ca. 3.0 Ga is related to increased recycling associated with the onset of plate tectonics. We recognize five stages of Earth’s evolution: (1) initial accretion and differentiation of the core/mantle system within the first few tens of millions of years; (2) generation of crust in a pre-plate tectonic regime in the period prior to 3.0 Ga; (3) early plate tectonics involving hot subduction with shallow slab breakoff over the period from 3.0 to 1.7 Ga; (4) Earth’s middle age from 1.7 to 0.75 Ga, characterized by environmental, evolutionary, and lithospheric stability; (5) modern cold subduction, which has existed for the past 0.75 b.y. Cycles of supercontinent formation and breakup have operated during the last three stages. This evolving tectonic character has likely been controlled by secular changes in mantle temperature and how that impacts on lithospheric behavior. Crustal volumes, reflecting the interplay of crust generation and recycling, increased until Earth’s middle age, and they may have decreased in the past ~1 b.y.
DS201710-2230
2017
Hawkesworth, C.J.Hawkesworth, C.J., Cawood, P.A., Dhuime, B., Kemp, T.I.S.Earth's continental lithosphere through time.Annual Review of Earth and Planetary Sciences, Vol. 45, pp. 169-198.MantleGeochronology

Abstract: The record of the continental lithosphere is patchy and incomplete; no known rock is older than 4.02 Ga, and less than 5% of the rocks preserved are older than 3 Ga. In addition, there is no recognizable mantle lithosphere from before 3 Ga. We infer that there was lithosphere before 3 Ga and that ?3 Ga marks the stabilization of blocks of continental lithosphere that have since survived. This was linked to plate tectonics emerging as the dominant tectonic regime in response to thermal cooling, the development of a more rigid lithosphere, and the recycling of water, which may in turn have facilitated plate tectonics. A number of models, using different approaches, suggest that at 3 Ga the volume of continental crust was ?70% of its present-day volume and that this may be a minimum value. The continental crust before 3 Ga was on average more mafic than that generated subsequently, and this pre-3 Ga mafic new crust had fractionated Lu/Hf and Sm/Nd ratios as inferred for the sources of tonalite-trondhjemite-granodiorite and later granites. The more intermediate composition of new crust generated since 3 Ga is indicated by its higher Rb/Sr ratios. This change in composition was associated with an increase in crustal thickness, which resulted in more emergent crust available for weathering and erosion. This in turn led to an increase in the Sr isotope ratios of seawater and in the drawdown of CO2. Since 3 Ga, the preserved record of the continental crust is marked by global cycles of peaks and troughs of U-Pb crystallization ages, with the peaks of ages appearing to match periods of supercontinent assembly. There is increasing evidence that the peaks of ages represent enhanced preservation of magmatic rocks in periods leading up to and including continental collision in the assembly of supercontinents. These are times of increased crustal growth because more of the crust that is generated is retained within the crust. The rates of generation of continental crust and mantle lithosphere may have remained relatively constant at least since 3 Ga, yet the rates of destruction of continental crust have changed with time. Only relatively small volumes of rock are preserved from before 3 Ga, and so it remains difficult to establish which of these are representative of global processes and the extent to which the rock record before 3 Ga is distorted by particular biases.
DS201802-0268
2018
Hawkesworth, C.J.Sun, W-d., Hawkesworth, C.J., Yao, C., Zhang, C-C., Huang, R.f., Liu, X., Sun, X-L, Ireland, T., Song, M-s., Ling, M-x., Ding, X., Zhang, Z-f., Fan, W-m., Wu, Z-q.Carbonated mantle domains at the base of the Earth's transition zone.Chemical Geology, Vol. 478, pp. 69-75.Mantlecarbonatite

Abstract: The oxygen fugacity of the upper mantle is 3-4 orders of magnitude higher than that of the lower mantle and this has been attributed to Fe2 + disproportionating into Fe3 + plus Fe0 at pressures > 24 GPa. The upper mantle might therefore have been expected to have evolved to more oxidizing compositions through geological time, but it appears that the oxygen fugacity of the upper mantle has remained constant for the last 3.5 billion years. Thus, it indicates that the mantle has been actively buffered from the accumulation of Fe3 +, and that this is linked to oxidation of diamond to carbonate coupled with reduction of Fe3 + to Fe2 +. When subducted plates penetrate into the lower mantle, compensational upwelling transports bridgmanite into the transition zone, where it breaks down to ringwoodite and majorite, releasing the ferric iron. The system returns to equilibrium through oxidation of diamond. Early in Earth history, diamond may have been enriched at the base of the transition zone in the Magma Ocean, because it is denser than peridotite melts at depths shallower than 660 km, and it is more buoyant below. Ongoing oxidation of diamond forms carbonate, leading to relatively high carbonate concentrations in the source of ocean island basalts.
DS201811-2580
2018
Hawkesworth, C.J.Hawkesworth, C.J., Brown, M.Earth dynamics and the development of plate tectonics.Philosophical Transactions Royal Society A, Vol. A376: doi://dx.doi.org/10.1098/rsta.2018.0228 5p.Mantleplate tectonics

Abstract: "Why does Earth have plate tectonics?" stands among the top research questions in the Earth Sciences. Plate tectonics developed in the last 4 billion years. This meeting will explore the evidence for the development of plate tectonics, contrast the terrestrial record with those from neighbouring planets, evaluate the conditions required for plate tectonics, and discuss implications for environmental conditions and development of the biosphere.
DS201812-2788
2018
Hawkesworth, C.J.Cawood, P.A., Hawkesworth, C.J.Continental crustal volume, thickness and area, and their geodynamic implications.Gondwana Research, doi.org/10.1016 /j.gr.2018.11.001 37p.Mantlegeodynamics

Abstract: Models of the volume of continental crust through Earth history vary significantly due to a range of assumptions and data sets; estimates for 3?Ga range from <10% to >120% of present day volume. We argue that continental area and thickness varied independently and increased at different rates and over different periods, in response to different tectonic processes, through Earth history. Crustal area increased steadily on a pre-plate tectonic Earth, prior to ca. 3?Ga. By 3?Ga the area of continental crust appears to have reached a dynamic equilibrium of around 40% of the Earth's surface, and this was maintained in the plate tectonic world throughout the last 3?billion?years. New continental crust was relatively thin and mafic from ca. 4-3?Ga but started to increase substantially with the inferred onset of plate tectonics at ca. 3?Ga, which also led to the sustained development of Earth's bimodal hypsometry. Integration of thickness and area data suggests continental volume increased from 4.5?Ga to 1.8?Ga, and that it remained relatively constant through Earth's middle age (1.8-0.8?Ga). Since the Neoproterozoic, the estimated crustal thickness, and by implication the volume of the continental crust, appears to have decreased by as much as 15%. This decrease indicates that crust was destroyed more rapidly than it was generated. This is perhaps associated with the commencement of cold subduction, represented by low dT/dP metamorphic assemblages, resulting in higher rates of destruction of the continental crust through increased sediment subduction and subduction erosion.
DS201812-2789
2018
Hawkesworth, C.J.Cawood, P.A., Hawkesworth, C.J., Pisarevsky, S.A., Dhuime, B., Capitanio, F.A., Nebel, O.Geological archive of the onset of plate tectonics.Philosphical Transactions of the Royal Society, rsta.royalsociety publishing.org 30p. AvailableMantletectonics, geochemistry

Abstract: Plate tectonics, involving a globally linked system of lateral motion of rigid surface plates, is a characteristic feature of our planet, but estimates of how long it has been the modus operandi of lithospheric formation and interactions range from the Hadean to the Neoproterozoic. In this paper, we review sedimentary, igneous and metamorphic proxies along with palaeomagnetic data to infer both the development of rigid lithospheric plates and their independent relative motion, and conclude that significant changes in Earth behaviour occurred in the mid- to late Archaean, between 3.2?Ga and 2.5?Ga. These data include: sedimentary rock associations inferred to have accumulated in passive continental margin settings, marking the onset of sea-floor spreading; the oldest foreland basin deposits associated with lithospheric convergence; a change from thin, new continental crust of mafic composition to thicker crust of intermediate composition, increased crustal reworking and the emplacement of potassic and peraluminous granites, indicating stabilization of the lithosphere; replacement of dome and keel structures in granite-greenstone terranes, which relate to vertical tectonics, by linear thrust imbricated belts; the commencement of temporally paired systems of intermediate and high dT/dP gradients, with the former interpreted to represent subduction to collisional settings and the latter representing possible hinterland back-arc settings or ocean plateau environments. Palaeomagnetic data from the Kaapvaal and Pilbara cratons for the interval 2780-2710?Ma and from the Superior, Kaapvaal and Kola-Karelia cratons for 2700-2440?Ma suggest significant relative movements. We consider these changes in the behaviour and character of the lithosphere to be consistent with a gestational transition from a non-plate tectonic mode, arguably with localized subduction, to the onset of sustained plate tectonics.
DS201812-2801
2017
Hawkesworth, C.J.Dhuime, B., Hawkesworth, C.J., Delavault, H., Cawood, P.A.Rates of generation and destruction of the continental crust: implications for continental growth.Philosphical Transactions of the Royal Society, http://dx.doi.org/ 10.1098/rsta .2017.0403 12p. AvailableMantleplate tectonics

Abstract: Less than 25% of the volume of the juvenile continental crust preserved today is older than 3?Ga, there are no known rocks older than approximately 4?Ga, and yet a number of recent models of continental growth suggest that at least 60-80% of the present volume of the continental crust had been generated by 3?Ga. Such models require that large volumes of pre-3?Ga crust were destroyed and replaced by younger crust since the late Archaean. To address this issue, we evaluate the influence on the rock record of changing the rates of generation and destruction of the continental crust at different times in Earth's history. We adopted a box model approach in a numerical model constrained by the estimated volumes of continental crust at 3?Ga and the present day, and by the distribution of crust formation ages in the present-day crust. The data generated by the model suggest that new continental crust was generated continuously, but with a marked decrease in the net growth rate at approximately 3?Ga resulting in a temporary reduction in the volume of continental crust at that time. Destruction rates increased dramatically around 3 billion years ago, which may be linked to the widespread development of subduction zones. The volume of continental crust may have exceeded its present value by the mid/late Proterozoic. In this model, about 2.6-2.3 times of the present volume of continental crust has been generated since Earth's formation, and approximately 1.6-1.3 times of this volume has been destroyed and recycled back into the mantle.
DS201901-0013
2019
Hawkesworth, C.J.Cawood, P. A., Hawkesworth, C.J.Continental crustal volume, thickness and area, and their geodynamic implications.Gondwana Research, Vol. 66, pp. 116-125.Mantleplate tectonics

Abstract: Models of the volume of continental crust through Earth history vary significantly due to a range of assumptions and data sets; estimates for 3?Ga range from <10% to >120% of present day volume. We argue that continental area and thickness varied independently and increased at different rates and over different periods, in response to different tectonic processes, through Earth history. Crustal area increased steadily on a pre-plate tectonic Earth, prior to ca. 3?Ga. By 3?Ga the area of continental crust appears to have reached a dynamic equilibrium of around 40% of the Earth's surface, and this was maintained in the plate tectonic world throughout the last 3?billion?years. New continental crust was relatively thin and mafic from ca. 4-3?Ga but started to increase substantially with the inferred onset of plate tectonics at ca. 3?Ga, which also led to the sustained development of Earth's bimodal hypsometry. Integration of thickness and area data suggests continental volume increased from 4.5?Ga to 1.8?Ga, and that it remained relatively constant through Earth's middle age (1.8-0.8?Ga). Since the Neoproterozoic, the estimated crustal thickness, and by implication the volume of the continental crust, appears to have decreased by as much as 15%. This decrease indicates that crust was destroyed more rapidly than it was generated. This is perhaps associated with the commencement of cold subduction, represented by low dT/dP metamorphic assemblages, resulting in higher rates of destruction of the continental crust through increased sediment subduction and subduction erosion.
DS200912-0152
2009
Hawkesworth, G.Darling, J., Storey, C., Hawkesworth, G.Impact melt sheet zircons and their implications for the Hadean crust.Geology, Vol. 37, 10, Oct. pp. 927-930.AustraliaZircon mineralogy
DS1993-0645
1993
Hawkesworth, K.Hawkesworth, K., Gallagher, K., Hergt, J.M., McDermott, F.Mantle and slab contribution in arc magmasAnnual Review of Earth and Planetary Sciences, Vol. 21, pp. 175-204MantleSubduction, Tectonics
DS202008-1451
2020
Hawkesworth. C.Sun, W-D., Zhang, L-p., Xie, G-z., Hawkesworth. C., Zartmam, R.Carbonatite formed through diamond oxidation.Goldschmidt 2020, 1p. AbstractMantlecarbonatite

Abstract: Carbonatite is a magmatic rock with high carbonate and low silicate contents, which mostly originate in the mantle. It is therefore of critical importance to understand the behavior of carbon in the mantle, and consequently deep carbon recycling. However, the formation of carbonatite is largely unresolved. In particular, the source of carbonatite the carbonate remains obscure. Previous studies showed that the solidus of carbonated mantle peridotite was lower than the Earth’s geotherm in the Archean and the Early Proterozoic era, before ~1.4 Ga ago. Therefore, the mantle should have been severely decarbonated early in Earth’s history. This is consistent with the low carbon abundance in the asthenospheric mantle (~100 ppm), as indicated by low carbonate concentrations in mid-ocean ridge basalts. Consequently, carbonate in young mantle must have been mostly obtained in the post-Archean era by two processes. These are either oxidation of diamond in the mantle or recycling of sedimentary carbonates through plate subduction. Here we show that the Sr and Nd isotope variations in carbonatite may be plausibly explained by mixing of three endmembers, (1) recycled sedimentary carbonates, (2) depleted mantle, and (3) a low Sr and Nd isotopes endmember. The low Sr, Nd carbonate reservoirs for carbonatites of different ages plot roughly on the evolution line of the primitive mantle, suggesting that they were successively released from a well-preserved, non-carbonate mantle source. The preferred candidate for this endmember is carbonate formed through oxidation of diamond by ferric ion released through decomposition of bridgmanite, which is carried up from the lower mantle via background upwelling, compensational to the volume of oceanic slabs penetrating into the lower mantle1.
DS1982-0266
1982
Hawkins, B.Hawkins, B.Diamonds in the People's Republic of China, 1982Sth. Afr. Department Min. Energy Affairs, Min. Bur. Report, Report No. L-82, JULY 12P.ChinaDiamond Occurrences, Production
DS1983-0297
1983
Hawkins, B.Hawkins, B.Diamonds in the People's Republic of China, February, 1983Coal, Gold And Base Minerals of Sth. Afr., Feb. PP. 73, 76, 78.ChinaProduction, History
DS1975-0291
1976
Hawkins, D.W.Hawkins, D.W.Emplacement Petrology and Geochemistry of Ultrabasic to Basic Intrusives at Aillik Bay Labrador.Msc. Thesis, Memorial University Newfoundland., Canada, Quebec, LabradorLamprophyres, Monchiquites, Pseudo Kimberlites, Glimmerite Xeno
DS2000-0395
2000
Hawkins, J.W.Hawkins, J.W.Geology of the supra subduction zones insights to origin of ophiolites of western North America Cordillera.Geological Society of America (GSA) Abstracts, Vol. 32, No. 7, p.A-47.CordilleraSubduction
DS2000-0396
2000
Hawkins, J.W.Hawkins, J.W.Geology of the supra subduction zones insights to orogin of ophiolites of western North America Cordillera.Geological Society of America (GSA) Abstracts, Vol. 32, No. 7, p.A-47.CordilleraSubduction
DS1996-1417
1996
Hawkins, M.P.Tejada, M.L.G., Mahoney, J.J., Duncan, R.A., Hawkins, M.P.Age and geochemistry of basement and alkalic rocks of Malaita and SantaIsabel, Solomon Islands, Ontong JavaJournal of Petrology, Vol. 37, No. 2, pp. 361-394.GlobalGeochemistry, Alkaline rocks
DS1995-0775
1995
Hawkins, P.Hawkins, P.Metallic and industrial mineral assessment report for the Mount Watt property, High Level, Alberta.Alberta Geological Survey, MIN 1995009AlbertaExploration - assessment
DS1995-0776
1995
Hawkins, P.A.Hawkins, P.A.Metallic and industrial mineral assessment report on the Peace River diamond property.Alberta Geological Survey, MIN 19950020/MIN 1995007AlbertaExploration - assessment, Ultrasonic Industrial Sciences ltd.
DS1991-0541
1991
Hawley, B.W.Gay, S.P.Jr., Hawley, B.W.Syngenetic magnetic anomaly sources: three examplesGeophysics, Vol. 56, No. 7, July pp. 902-913Nebraska, Utah, BelizeGeophysics -magnetics, Magnetite
DS1984-0643
1984
Hawley, J.W.Seager, W.R., Shafiquillah, M., Hawley, J.W., Marvin, R.F.New Potassium-argon Dates from Basalts and the Evolution of the Southern Rio Grande Rift.Geological Society of America (GSA) Bulletin., Vol. 95, No. 1, PP. 87-99.United States, Texas, New MexicoMid Continent
DS1994-0746
1994
Hawley, P.J.Hawley, P.J.Report on the 1993 detailed geophysics and diamond drilling on the le Sueur property.Quebec Department of Mines, GM 52644, 106p.QuebecExploration - assessment
DS1993-0555
1993
Hawman, R.B.Gohl, K., Hawman, R.B., Smithson, S.B.Wide angle reflection studies of the crust and Moho beneath the Archean gneiss terrane of southern MinnesotaGeophysical Research Letters, Vol. 20, No. 7, April 9, pp. 619-622MinnesotaGeophysics, Mantle
DS201702-0215
2016
Hawman, R.B.Hopper, E., Fischer, K.M., Rondenay, S., Hawman, R.B., Wagner, L.S.Imaging crustal structure beneath the southern Appalachians with wavefield migration.Geophysical Research Letters, Vol. 43, 23, pp. 12,054-62.United StatesGeophysics - seismics

Abstract: To constrain crustal structures in the southern Appalachians and the suture zone with the Gondwanan-affinity Suwannee terrane, we applied the 2-D generalized Radon transform wavefield migration method to the scattered incident P wavefield recorded by the EarthScope Southeastern Suture of the Appalachian Margin Experiment and adjacent Transportable Array stations. We resolve the root of thickened crust beneath the high topography of the Blue Ridge Mountains and estimate its density contrast with the mantle to be only 104?±?20?kg/m3. A weak velocity contrast across the crustal root Moho is observed and may be related to an ongoing crustal delamination event, possibly contributing to local tectonic rejuvenation. Beneath the Suwannee terrane, we confirm prior observations of a gently south-southeastward dipping crustal suture, indicating the terminal collision of Laurentia and Gondwana involved several hundred kilometers of overthrusting.
DS2002-1313
2002
Hawsh, T.Rasskazov, S.V., Bowring, S.A., Hawsh, T., et al.The Pb Nd Sr isotope systematics in heterogeneous continental lithosphere above the convecting mantle domain.Doklady, Vol. 387A, Nov-Dec. No. 9, pp. 1056-9.MantleGeochronology, Convection
DS2002-1316
2002
Hawsh, T.Razzkazov, S.V., Bowring, S.A., Hawsh, T., Demonterova, E.I., Logachev, N.A.The Pb Nd and Sr isotope systematics in heterogeneous continental lithosphere aboveDoklady Earth Sciences, Vol. 387A, 9. pp. 1056-9.MantleGeochronology, Convection
DS1988-0645
1988
Hawthorn, J.B.Smith, C.B., Colgan, E.A., Hawthorn, J.B., Hutchinson, G.Emplacement age of the Cross kimberlite, southeastern british Columbia by the Rb Sr phlogopite method.Canadian Journal of Earth Sciences, Vol. 25, pp. 79-92.British ColumbiaGeochronology, deposit - Cross
DS201212-0060
2012
Hawthorne, D.Bastow, I.D., Kendall, J.M., Brisbourne, A.M., Snyder, D.B., Thompson, D., Hawthorne, D., Hefffrich, G.R., Wookey, J., Horleston, A., Eaton, D.The Hudson Bay lithospheric experiment.Astronomy and Geophysics, pp. 6.21-6.24.Canada, Ontario, QuebecGeophysics - seismics
DS1988-0295
1988
Hawthorne, F.C.Hawthorne, F.C.Spectroscopic methods in mineralogy and geology.Diamond andreferencesReviews in Mineralogy, Vol. 18, pp. 562, 566, 568, 570, 571GlobalBlank
DS1995-0777
1995
Hawthorne, F.C.Hawthorne, F.C.Light lithophile elements in metamorphic rock forming mineralsEur. Journal of Mineralogy, Vol. 7, pp. 607-622GlobalMicroprobe, Crystal chemistry
DS1995-1370
1995
Hawthorne, F.C.Oberti, R., Hawthorne, F.C., Ungaretti, CannilloAluminum disorder in amphiboles from mantle peridotitesCanadian Mineralogist, Vol. 33, No. 4, August pp. 867-878.MantlePeridotites
DS1998-1021
1998
Hawthorne, F.C.Mitchell, R.H., Choi, J-B., Hawthorne, F.C., McCammonLatrappite: a re-investigationCan. Mineralog., Vol. 36, No. 1, Feb pp. 107-116.Quebec, Arkansas, GermanyCarbonatite, Mineralogy
DS2001-1101
2001
Hawthorne, F.C.Sokolova, E.V., Hawthorne, F.C.The crystal chemistry of malinkoite and Lisitsynite from the Khibin a Lovozero Complex, Kola Peninsula.Can. Mineralog., Vol. 39, No. 1, Feb. No.159-69.Russia, Kola PeninsulaMineralogy, alkaline, Deposit - Khibina Lovozero
DS200812-0193
2008
Hawthorne, F.C.Chakhmouradian, A.R., Cooper, M.A., Medici, L., Hawthorne, F.C., Adar, F.Fluorine rich hibschite from silicocarbonatite, AfrikAnd a Complex, Russia: crystal chemistry and conditions of crystallization.Canadian Mineralogist, Vol. 46, 4, August pp.RussiaCarbonatite
DS201012-0358
2010
Hawthorne, F.C.Khomyakov, A.P., Camara, F., Sokolova, E., Abdu, Y., Hawthorne, F.C.Paraershovite, a new mineral species from the Khibin alkaline massif, Kola Peninsula, Russia: description and crystal structure.Canadian Mineralogist, Vol. 48, 2, pp. 291-300.Russia, Kola PeninsulaAlkalic
DS201212-0104
2012
Hawthorne, F.C.Camara, F.,Sokolova, E., Hawthorne, F.C.Kazanskyite, Ba Ti Nb Na3 Ti (Si207) 202 (OH) 2 (H20)4, a group III Ti disilicate mineral from the Khibiny alkaline massif, Kola Peninsula, Russia: description and crystal structure.Mineralogical Magazine, Vol. 76, 3, pp. 473-492.Russia, Kola PeninsulaAlkalic
DS201412-0091
2014
Hawthorne, F.C.Camara, F., Skolova, E., Abdu, Y.A., Hawthorne, F.C.Nafertisite Na3Fe2 10Ti2(Si6017)02(OH)6F(H2))2 from Mt. Kukisvumchorr Khibiny alkaline massif, Kola Peninsula, Russia: refinement of the crystal structure and revision of the chemical formula.European Journal of Mineralogy, Vol. 26, pp. 689-700.Russia, Kola PeninsulaKhibiniy Massif
DS201602-0241
2015
Hawthorne, F.C.Sokolova, E., Abdu, Y., Hawthorne, F.C., Genovese, A., Camara, F., Khomyakov, A.P.From structure topology to chemical composition. XVIII. Titanium silicates: revision of the crystal structure and chemical formula of Betalomonosovite, a group IV TS-block mineral from the Lovozero alkaline massif, Kola Peninsula.The Canadian Mineralogist, Vol. 53, pp. 401-428.Russia, Kola PeninsulaLovozero Massif

Abstract: The crystal structure of betalomonosovite, ideally Na6?4Ti4(Si2O7)2[PO3(OH)][PO2(OH)2]O2(OF), a 5.3331(7), b 14.172(2), c 14.509(2) Å, ? 103.174(2), ? 96.320(2), ? 90.278(2)°, V 1060.7(4) Å3, from the Lovozero alkaline massif, Kola peninsula, Russia, has been refined in the space group PFormula to R = 6.64% using 3379 observed (Fo > 4?F) reflections collected with a single-crystal APEX II ULTRA three-circle diffractometer with a rotating-anode generator (MoK?), multilayer optics, and an APEX-II 4K CCD detector. Electron-microprobe analysis gave the empirical formula (Na5.39Ca0.36Mn0.04Mg0.01)?5.80 (Ti2.77Nb0.48Mg0.29Fe3+0.23Mn0.20Zr0.02Ta0.01)?4(Si2.06O7)2[P1.98O5(OH)3]O2[O0.82F0.65(OH)0.53]?2, Dcalc. = 2.969 g cm?3, Z = 2, calculated on the basis of 26 (O + F) apfu, with H2O determined from structure refinement. The crystal structure of betalomonosovite is characterized by extensive cation and anion disorder: more than 50% of cation sites are partly occupied. The crystal structure of betalomonosovite is a combination of a titanium silicate (TS) block and an intermediate (I) block. The TS block consists of HOH sheets (H-heteropolyhedral, O-octahedral) and exhibits linkage and stereochemistry typical for Group IV (Ti + Mg + Mn = 4 apfu) of the TS-block minerals. The I block is a framework of Na polyhedra and P tetrahedra which ideally gives {Na2?4[PO3(OH)][PO2(OH)2]} pfu. Betalomonosovite is an Na-poor OH-bearing analogue of lomonosovite, Na10Ti4(Si2O7)2(PO4)2O4. In the betalomonosovite structure, there is less Na in the I block and in the TS block when compared to the lomonosovite structure. The OH groups occur mainly in the I block where they coordinate P and Na atoms and in the O sheet of the TS block (minor). The presence of OH groups in the I block and in the TS block is supported by IR spectroscopy and bond-valence calculations on anions. High-resolution TEM of lomonosovite shows the presence of pervasive microstructural intergrowths, accounting for the presence of signals from H2O in the infrared spectrum of anhydrous lomonosovite. More extensive lamellae in betalomonosovite suggest a topotactic reaction from lomonosovite to betalomonosovite.
DS1960-0960
1968
Hawthorne, J.B.Hawthorne, J.B.Kimberlite SillsGeological Society of South Africa Transactions, Vol. 71, No. 3, PP. 291-311.South Africa, East AfricaGeology
DS1970-0062
1970
Hawthorne, J.B.Dawson, J.B., Hawthorne, J.B.Intrusion Features of Some Hypabyssal South African Kimberlites.Bulletin. VOLCANOLOGIQUE., Vol. 34, PP. 740-757.South AfricaGeology, Alteration
DS1970-0525
1972
Hawthorne, J.B.Hawthorne, J.B., Harris, J.W., Gurney, J.J., Rickard, R.Inclusions in Diamonds from Southern AfricaPreprint, 21p.South AfricaDiamond Inclusions, Deposit - Premier, Finsch, Koffiefontein
DS1970-0659
1973
Hawthorne, J.B.Dawson, J.B., Hawthorne, J.B.Magmatic Sedimentation and Carbonatitic Differentiation in kimberlite Sills at Benfontein.Quarterly Journal of Geological Society (London), Vol. 129, No. 1, PP. 61-85.South AfricaGenesis
DS1970-0708
1973
Hawthorne, J.B.Harris, J.W., Hawthorne, J.B., Oosterveld, M.M., Weymeyer, E.Regularities in the Characteristics of South African Kimberlites.1st International Kimberlite Conference, EXTENDED ABSTRACT VOLUME, PP. 151-154.South AfricaClassification
DS1975-0096
1975
Hawthorne, J.B.Harris, J.W., Hawthorne, J.B., Oosterveld, M.M., Wehmeyer, E.A Classification Scheme for Diamond and a Comparative Studyof South African Diamond Characteristics.Physics and Chemistry of the Earth., Vol. 9, PP. 765-783.South AfricaDiamond Genesis
DS1975-0101
1975
Hawthorne, J.B.Hawthorne, J.B.Model of a Kimberlite PipePhysics and Chemistry of the Earth., Vol. 9, PP. 1-15.South Africa, BotswanaKimberley, Orapa, Kimberlite Genesis
DS1975-0978
1979
Hawthorne, J.B.Clement, C.R., Skinner, E.M.W., Hawthorne, J.B., Kleinjan, L.Precambrian Ultramafic Dykes with Kimberlite Affinities in The Kimberley Area.Proceedings of Second International Kimberlite Conference, Proceedings Vol. 1, PP. 101-110.South AfricaDe Beers, Wesselton, Geology, Related Rocks
DS1975-1054
1979
Hawthorne, J.B.Harris, J.W., Hawthorne, J.B., Oosterveld, M.M.Regional and Local Variations in the Characteristics of Diamonds from Some Southern African Kimberlites.Proceedings of Second International Kimberlite Conference, Vol. 1, PP. 27-41.Botswana, South AfricaKimberlite, Crystallography, Genesis
DS1975-1068
1979
Hawthorne, J.B.Hawthorne, J.B., Carrington, A.J., Clement, C.R., Skinner, E.M.Geology of the Dokolwayo Kimberlite and Associated Palaeo-alluvial Diamond Deposits.Proceedings of Second International Kimberlite Conference, Proceedings Vol. 1, PP. 59-70.GlobalGeology
DS1982-0253
1982
Hawthorne, J.B.Harris, J.W., Hawthorne, J.B., Oosterveld, M.M.Diamond Characteristics of the de Beers Pool Mines, Kimberley, South Africa.Proceedings of Third International Kimberlite Conference, TERRA COGNITA, ABSTRACT VOLUME., Vol. 2, No. 3, P. 200, (abstract.).South AfricaKimberlite, Bultfontein, Dutoitspan, Wesselton Physical
DS1983-0283
1983
Hawthorne, J.B.Harris, J.W., Hawthorne, J.B., Oosterveld, M.M.A Comparison of Diamond Characteristics from the de Beers Pool Mines, Kimberley, South Africa.Annales Scientifiques De L' Universite De Clermont-ferrand Ii, No. 74, PP. 1-14.South AfricaDiamond Morphology
DS1984-0190
1984
Hawthorne, J.B.Clement, C.R., Harris, J.W., Robinson, D.N., Hawthorne, J.B.The de Beers Kimberlite Pipe - a Historic South African Diamond Mine.Geological Society of South Africa, South AfricaHistory, Geology, Mining Recovery, Diamonds
DS1986-0143
1986
Hawthorne, J.B.Clement, C.R., Harris, J.W., Hawthorne, J.B.The De Beers kimberlite pipe- a historic south African diamond mineMineral Deposits of Southern Africa, Vol. 2, pp. 2193-2214South AfricaHistory
DS1986-0341
1986
Hawthorne, J.B.Harris, J.W., Hawthorne, J.B., Oosterveld, M.M.A comparison of characteristics of diamonds from Orapa and Jwaneng kimberlite pipes in BotswanaProceedings of the Fourth International Kimberlite Conference, Held Perth, Australia, No. 16, pp. 395-397BotswanaDiamond morphology
DS201909-2107
2019
Haxel, G.Watts, K., Haxel, G., Miller, D.Zircon record of alkaline magmatism associated with the Mountain Pass carbonatite REE deposit, southeast Mojave desert, California, USA.Goldschmidt2019, 1p. AbstractUnited States, Californiadeposit - Mountain Pass

Abstract: Mountain Pass is one of the largest and most economically important REE deposits in the world. The ore body is a carbonatite stock within a shonkinite and syenite plutonic complex, which is part of a ~130 km long trend of Mesoproterozoic alkaline igneous rocks in the southeast Mojave Desert [1]. Zircons from a suite of shonkinite and syenite rocks at Mountain Pass were analyzed by SHRIMP-RG (207Pb/206Pb ages and trace elements) and SIMS (O isotopes) to elucidate their petrogenesis and potential relationship to ore-forming carbonatite. Concordant 207Pb/206Pb dates define multimodal distributions from ~1370-1435 Ma and ~1530-1780 Ma. The youngest 207Pb/206Pb dates of ~1370-1380 Ma and ~1390-1400 Ma overlap published Th-Pb monazite ages of 1371 ± 10 Ma and 1396 ± 16 Ma for the carbonatite ore body and a smaller carbonatite dike at Mountain Pass [2]. The youngest (<1435 Ma) zircons, interpreted to be magmatic (autocrystic), have REE up to ~10,000x chondrite values, subtle (~0.8) Eu/Eu* anomalies, generally low U (<500 ppm), moderate Hf (<11,000 ppm), and Ti-in-zircon temperatures that cluster at ~800 °C. Paleoproterozoic zircon xenocrysts have larger Eu/Eu* anomalies (~0.1- 0.5) and extend to higher Hf contents (>11,000 ppm). Zircon ?18O values in the <1435 Ma grains span from mantle (~5‰) to supracrustal (~7‰), and are mostly in the higher supracrustal end of the range. Paleoproterozoic zircons overlap this range as well as extend to higher ?18O values (~9‰). Our new data support coeval and longlived (20 Myr+) alkaline and carbonatite magmatism and underscore the relative importance of the crust in generating magmas associated with the world-class Mountain Pass REE deposit.
DS202112-1955
2021
Haxel, G.B.Watts, K.E., Haxel, G.B., Miller, D.M.Temporal and petrogenetic links between Mesoproterozoic alkaline and carbonatite magmas at Mountain Pass, California.Economic Geology, Vol. 117, 1, pp. 23p.United States, Californiadeposit - Mountain Pass

Abstract: Mountain Pass is the site of the most economically important rare earth element (REE) deposit in the United States. Mesoproterozoic alkaline intrusions are spatiotemporally associated with a composite carbonatite stock that hosts REE ore. Understanding the genesis of the alkaline and carbonatite magmas is an essential scientific goal for a society in which critical minerals are in high demand and will continue to be so for the foreseeable future. We present an ion microprobe study of zircon crystals in shonkinite and syenite intrusions to establish geochronological and geochemical constraints on the igneous underpinnings of the Mountain Pass REE deposit. Silicate whole-rock compositions occupy a broad spectrum (50-72 wt % SiO2), are ultrapotassic (6-9 wt % K2O; K2O/Na2O = 2-9), and have highly elevated concentrations of REEs (La 500-1,100× chondritic). Zircon concordia 206Pb/238U-207Pb/235U ages determined for shonkinite and syenite units are 1409 ± 8, 1409 ± 12, 1410 ± 8, and 1415 ± 6 Ma (2?). Most shonkinite dikes are dominated by inherited Paleoproterozoic xenocrysts, but there are sparse primary zircons with 207Pb/206Pb ages of 1390-1380 ± 15 Ma for the youngest grains. Our new zircon U-Pb ages for shonkinite and syenite units overlap published monazite Th-Pb ages for the carbonatite orebody and a smaller carbonatite dike. Inherited zircons in shonkinite and syenite units are ubiquitous and have a multimodal distribution of 207Pb/206Pb ages that cluster in the range of 1785-1600 ± 10-30 Ma. Primary zircons have generally lower Hf (<11,000 ppm) and higher Eu/Eu* (>0.6), Th (>300 ppm), Th/U (>1), and Ti-in-zircon temperatures (>800°C) than inherited zircons. Oxygen isotope data reveals a large range in ?18O values for primary zircons, from mantle (5-5.5‰) to crustal and supracrustal (7-9‰). A couple of low-?18O outliers (2‰) point to a component of shallow crust altered by meteoric water. The ?18O range of inherited zircons (5-10‰) overlaps that of the primary zircons. Our study supports a model in which alkaline and carbonatite magmatism occurred over tens of millions of years, repeatedly tapping a metasomatized mantle source, which endowed magmas with elevated REEs and other diagnostic components (e.g., F, Ba). Though this metasomatized mantle region existed for the duration of Mountain Pass magmatism, it probably did not predate magmatism by substantial geologic time (>100 m.y.), based on the similarity of 1500 Ma zircons with the dominantly 1800-1600 Ma inherited zircons, as opposed to the 1450-1350 Ma primary zircons. Mountain Pass magmas had diverse crustal inputs from assimilation of Paleoproterozoic and Mesoproterozoic igneous, metaigneous, and metasedimentary rocks. Crustal assimilation is only apparent from high spatial resolution zircon analyses and underscores the need for mineral-scale approaches in understanding the genesis of the Mountain Pass system.
DS1995-0778
1995
Hay, D.E.Hay, D.E., Wendtland, R.F., Wendtland, E.D.The origin of Kenya Rift Plateau type flood phonolites -geochemical Studies for fusion of lower crust.Journal of Geophy. Res. Sol., Vol. 100, No. 1, Jan. 10, pp. 455-474.Kenya, southern AfricaMagmatism, Crust -fusion
DS1860-0384
1882
Hay, R.Hay, R.The Igneous Rocks of KansasKansas Academy of Science Transactions, Vol. 8, PP. 14-18.United States, Kansas, Wilson CountyAlkaline rocks
DS200512-1109
2005
Hay, R.Unruh, J., Cligget, L., Hay, R.Migrant land rights reception and 'clearing to claim' in sub Saharan Africa.Natural Resources Forum, Vol. 29, 3, August pp. 190-198.Africa, southern AfricaNews item - legal, aboriginal
DS1975-0758
1978
Hay, R.L.Hay, R.L.Melilitite-carbonatite Tuffs in the Laetolil Beds of TanzaniContributions to Mineralogy and Petrology, Vol. 67, PP. 357-367.Tanzania, East AfricaRelated Rocks
DS1983-0298
1983
Hay, R.L.Hay, R.L., O'neil, J.R.Carbonatite Tuffs in the Laetoli Beds of Tanzania and the Kaiserstuhl in Germany.Contributions to Mineralogy and Petrology, Vol. 82, No. 4, PP. 403-406.Tanzania, East AfricaRelated Rocks
DS1989-0602
1989
Hay, R.L.Hay, R.L.Holocene carbonatite nephelinite tephra deposits of Oldoinyo Lengai, TanzaniaJournal of Volcanology and Geothermal Research, Vol. 37, pp. 77-91TanzaniaCarbonatite, Natrocarbonatite
DS201112-0421
2002
Hay, S.Hay, S.Mineralogy of pyrochlore, perovskite and zirconolite in carbonatites from the Oka complex, Quebec.Thesis: Msc. Lakehead University, Canada, QuebecThesis - note availability based on request to author
DS2003-0563
2003
Hay, S.E.Hay, S.E.The niobium mineralization of the Oka carbonatite complex, Oka QuebecGeological Association of Canada Annual Meeting, Abstract onlyQuebecCarbonatite
DS200412-0805
2003
Hay, S.E.Hay, S.E.The niobium mineralization of the Oka carbonatite complex, Oka Quebec.Geological Association of Canada Annual Meeting, Abstract onlyCanada, QuebecCarbonatite
DS200412-0806
2004
Hay, S.E.Hay, S.E., Heaman, L.M., Strand, P.The Churchill kimberlites: a newly discovered Diamondiferous kimberlite province in Nunavut Canada.Geological Association of Canada Abstract Volume, May 12-14, SS14-06 p. 265.abstractCanada, NunavutPetrography
DS1996-0618
1996
Hay, W.W.Hay, W.W.Tectonics and climateGeologische Rundschau, Vol. 85, pp. 409-437GlobalTectonics, uplift, Climate, atmospheric circulation, hydrology
DS1997-0492
1997
Hay, W.W.Hay, W.W., DeConto, R.M., Wold, Ch.M.Climate: is the past the key to the future?Geologische Rundschau, Vol. 86, No. 2, pp. 471-GlobalClimate
DS2002-0682
2002
Hay, W.W.Hay, W.W., Soeding, E., De Conto, R.M., Wold, C.N.The late Cenozoic uplift - climate change paradoxInternational Journal of Earth Sciences, Vol. 91, No. 5, Oct. pp. 746-74.GlobalGeomorphology - climate change
DS200912-0361
2009
Hayasaka, Y.Katsube, A., Hayasaka, Y., Santosh, M., Li, S., Terada, K.SHRIMP zircon U Pb ages of eclogite and orthogneiss from Sulu ultrahigh pressure zone in Yangkou area, eastern China.Gondwana Research, Vol. 15, 2, pp. 168-177.ChinaUHP
DS2000-0397
2000
Hayashi, M.Hayashi, M., Komiya, T., Mauyama, S.Archean regional metamorphism of the Isua Supracrustal Belt: implications for driving force for Archean plateInternational Geology Review, Vol. 42, No. 12, Dec. 1, pp. 1055-1115.Greenland, southern WestTectonics
DS2000-0398
2000
Hayashi, M.Hayashi, M., Komya, Nakamura, MaryamaArchean regional metamorphism of the Isua greenstone belt: implications driving force for plate tectonicsInternational Geology Review, Vol.42, 12, Dec. pp. 1055-1115.Greenland, southwestTectonics
DS2001-0461
2001
Hayashi, M.Hayashi, M., Komiya, T., Nakamura, Y., Maruyama, S.Archean regional metamorphism Isua supracrustal belt: implications for a driving force for Archean plate..International Geology Review, Vol. 42, No. 12, Dec. pp. 1055-1115.Greenland, southwestTectonics, metamorphism
DS2002-0871
2002
Hayashi, M.Komiya, T., Hayashi, M., Maryyama, S., Yurimoto, H.Intermediate P T type Archean metamorphism of the Isua supracrustal beltAmerican Journal of Science, Vol. 302, 9, pp. 806-26.GreenlandSubduction
DS1986-0027
1986
Hayatsu, A.Arima, N., Barnett, R.L., Hayatsu, A., Kerrich, R.A new kimberlite occurrence at Nickila Lake, Abitibi Greenstone belt; petrology, geochemistry and isotopic characteristicsGeological Association of Canada (GAC) Annual Meeting, Vol. 11, p. 42. (abstract.)OntarioKirkland Lake, Diatreme, Geochonology
DS1988-0267
1988
Hayatsu, A.Greenough, J.D., Hayatsu, A., Papezik, V.S.Mineralogy, petrology and geochemistry of the alkaline Malpeque Bay @Prince Edward IslandCanadian Mineralogist, Vol. 26, No. 1, March pp. 97-108GlobalBlank
DS1997-0493
1997
Haycock, C.A.Haycock, C.A., Mason, T.R., Watkeys, M.K.Early Triassic paleoenvironments in the eastern Karoo Foreland Basin, SouthAfrica.Journal of African Earth Sciences, Vol. 24, No. 1-2, Jan. pp. 79-94.South AfricaSedimentology, Karoo Basin
DS1910-0503
1916
Hayden, H.H.Hayden, H.H.The Mineral Production of India During 1915India Geological Survey Records, Vol. 47, PP. 144-195.IndiaDiamond Production
DS200712-1137
2007
Hayden, L.A.Watson, E.B., Wark, D.A., Hayden, L.A., Cherniak, D.J., Thomas, J.B., Ferry, J.M.A retrospective overview of the new Ti-Zt thermometers for zircon, rutile, sphene and quartz.Frontiers in Mineral Sciences 2007, Joint Meeting of Mineralogical societies Held June 26-28, Cambridge, Abstract Volume p. 84.TechnologyGeothermometry
DS200712-1138
2007
Hayden, L.A.Watson, E.B., Wark, D.A., Hayden, L.A., Cherniak, D.J., Thomas, J.B., Ferry, J.M.A retrospective overview of the new Ti-Zt thermometers for zircon, rutile, sphene and quartz.Frontiers in Mineral Sciences 2007, Joint Meeting of Mineralogical societies Held June 26-28, Cambridge, Abstract Volume p. 84.TechnologyGeothermometry
DS200812-0456
2007
Hayden, L.A.Hayden, L.A., Watson, E.B.A diffusion mechanism for core-mantle interaction.Nature, Vol. 450, 7170, pp. 709-711.MantleGeophysics - seismics
DS200812-0457
2008
Hayden, L.A.Hayden, L.A., Watson, E.B., Wark, D.A.A thermobarometer for sphene ( titanite).Contributions to Mineralogy and Petrology, Vol. 155, 4, pp. 529-540.TechnologyThermobarometry
DS2001-1019
2001
Haydoutov, I.Savov, I., Ryan, J., Haydoutov, I., Schijf, J.Late Precambrian Balkan Carpathian ophiolite - a slice of the Pan African ocean crust? geochemical, tectonicsJour. Volc. Geotherm. Res., Vol. 110, No.3-4, pp. 299-318.Bulgaria, SyriaOphiolite, Massifs - Tcherni Vrah, Deli Jovan
DS1930-0063
1931
Hayes, A.O.Hayes, A.O.Mining Geology in 1930Institute of Mining and Metallurgy. Transactions, Vol. 12, JANUARY, PP. 19-22.South AfricaCurrent Activities
DS200612-0552
2006
Hayes, G.P.Hayes, G.P., Johnson, C.B., Furlong, K.P.Evidence for melt injection in the crust of northern California?Earth and Planetary Science Letters, Vol. 248, 3-4, Aug. 30, pp. 638-649.United States, CaliforniaMelting
DS1990-0679
1990
Hayes, J.M.Hayes, J.M., Pratt, L.M., Knoll, A.H.Organic geochemical and tectonic evolution of the midcontinent rift system:organic geochemistry and micropaleontology. Progress reportNational Technical Information Service DOE/ER/13978-2 22p. June 1, 1990 $ 15.00 United States, MidcontinentRift, Tectonics
DS1992-0359
1992
Hayes, J.M.Des Marais, D.J., Strauss, H., Summons, R.E., Hayes, J.M.Carbon isotope evidence for the stepwise oxidation of the ProterozoicenvironmentNature, Vol. 359, No. 6396, October 15, pp. 605-609GlobalProterozoic, Geochronology
DS200612-0553
2006
Hayes, J.M.Hayes, J.M.The pathway of carbon in nature.Science, Vol. 312, 5780, June 16, pp. 1605-1606.TechnologyCarbon, abiotic reactions
DS200612-0554
2006
Hayes, J.M.Hayes, J.M., Waldbauer, J.R.Exchange of C between mantle and crust and its effect on global redox budgets.Geochimica et Cosmochimica Acta, Vol. 70, 18, p. 19. abstract only.MantleGeochemistry - carbon
DS1900-0023
1900
Hayes, M.H.Hayes, M.H.Among Horses in South AfricaLondon: Everett., 231P.Africa, South AfricaTravelogue, Biography, Kimberley
DS2000-0399
2000
Hayes, P.Hayes, P.Keeping the resource database honestMin. Res. Ore Res. Est. AusIMM Guide, Mon. 23, pp. 79-84.AustraliaEconomics - geostatistics, ore reserves, exploration, Not specific to diamonds
DS1975-1085
1979
Haygood, C.Johnson, R.W.JR., Hildenbrand, T.G., Haygood, C., Kunselman, P.Magnetic Anomaly Map of the Greater New Madrid Seismic ZoneEos, Vol. 61, No. 5, PP. 47-48. (abstract.).GlobalMid-continent
DS1988-0013
1988
Hayman, C.C.Angus, J.C., Hayman, C.C.Low pressure metastable growth of diamond and 'diamondlike' phasesScience, Vol. 241, No. 4868, pp. 913-921GlobalDiamond synthesis
DS1970-0526
1972
Hayman, E.C.Hayman, E.C.Magnetometer Survey of Dyke 143, Marallaneng, Butha Buthe Project Lesotho 3.Maseru Department of Mines Geol. Spec. Report, No. ECH/1.LesothoKimberlite, Geophysics, Prospecting
DS200712-0821
2007
Hayman, P.Pearson, D.G., Harlou, R., Hayman, P., Cartigny, P., Kopylova, M.Sr isotopic compositions of ultra deep inclusions in diamonds: implications for mantle chemical structure and evolution.Plates, Plumes, and Paradigms, 1p. abstract p. A769.MantleUHP
DS200812-0184
2008
Hayman, P.Cas, R., Porritt, L., Pittari, A., Hayman, P.A new approach to kimberlite facies terminology using a revised general approach to the nomenclature of all volcanic rocks and deposits: description to genetic.Journal of Volcanology and Geothermal Research, Vol. 174, 1-3, pp. 226-240.MantleAlteration, descriptive, genetic
DS200812-0185
2008
Hayman, P.Cas, R.A.F., Hayman, P., Pittari, A., Porritt, L.Some major problems with existing models and terminology associated with kimberlite pipes from a volcanological perspective, and some suggestions.Journal of Volcanology and Geothermal Research, Vol. 174, 1-3, pp. 209-225.Africa, CanadaVolcanology, original textures, alteration, terminology
DS200812-0588
2008
Hayman, P.Kopylova, M.G., Hayman, P.Petrology and textural classification of the Jericho kimberlite, northern Slave Province.Canadian Journal of Earth Sciences, Vol. 45, 6, June 1, pp. 701-723.Canada, Northwest TerritoriesDeposit - Jericho
DS200912-0288
2009
Hayman, P.Hayman, P., Cas, R.An unusual example of coherent kimberlite from the Muskox kimberlite ( Nunavut) Canada: a re-evaluation of the criteria for recognizing coherent kimberlite.GAC/MAC/AGU Meeting held May 23-27 Toronto, Abstract onlyCanada, NunavutDeposit - Muskox
DS201112-0422
2011
Hayman, P.Hayman, P.Characteristics of coherent kimberlite.IUGG Held July 6, AbstractGlobalPetrology and how common?
DS201112-0423
2003
Hayman, P.Hayman, P.Characterization of diamonds and diamond inclusions from the Rio Soriso, Juiana area, Brazil.University of British Columbia, Msc. thesis, 290p.South America, BrazilThesis - note availability based on request via author
DS201703-0432
2017
Hayman, P.Ross, P-S., Carrasco Nunez, G., Hayman, P.Felsic maar-diatreme volcanoes: a review.Bulletin of Volcanology, Vol. 79, 2 in press availableSouth America, MexicoDiatremes

Abstract: Felsic maar-diatreme volcanoes host major ore deposits but have been largely ignored in the volcanology literature, especially for the diatreme portion of the system. Here, we use two Mexican tuff rings as analogs for the maar ejecta ring, new observations from one diatreme, and the economic geology literature on four other mineralized felsic maar-diatremes to produce an integrated picture of this type of volcano. The ejecta rings are up to 50 m+ thick and extend laterally up to ?1.5 km from the crater edge. In two Mexican examples, the lower part of the ejecta ring is dominated by pyroclastic surge deposits with abundant lithic clasts (up to 80% at Hoya de Estrada). These deposits display low-angle cross-bedding, dune bedforms, undulating beds, channels, bomb sags, and accretionary lapilli and are interpreted as phreatomagmatic. Rhyolitic juvenile clasts at Tepexitl have only 0-25% vesicles in this portion of the ring. The upper parts of the ejecta ring sequences in the Mexican examples have a different character: lithic clasts can be less abundant, the grain size is typically coarser, and the juvenile clasts can be different in character (with some more vesicular fragments). Fragmentation was probably shallower at this stage. The post-eruptive maar crater infill is known at Wau and consists of reworked pyroclastic deposits as well as lacustrine and other sediments. Underneath are bedded upper diatreme deposits, interpreted as pyroclastic surge and fall deposits. The upper diatreme and post-eruptive crater deposits have dips larger than 30° at Wau, with approximately centroclinal attitudes. At still lower structural levels, the diatreme pyroclastic infill is largely unbedded; Montana Tunnels and Kelian are good examples of this. At Cerro de Pasco, the pyroclastic infill seems bedded despite about 500 m of post-eruptive erosion relative to the pre-eruptive surface. The contact between the country rocks and the diatreme is sometimes characterized by country rock breccias (Kelian, Mt. Rawdon). Pyroclastic rocks in the diatreme are typically poorly sorted, and ash-rich. They contain a heterolithic mix of juvenile clasts and lithic clasts from various stratigraphic levels. Megablocks derived from the ejecta ring or the country rocks are often found in the diatremes. Evidence for multiple explosions is in the form of steep crosscutting pyroclastic bodies within some diatremes and fragments of pyroclastic rocks within other pyroclastic facies. Pyroclastic rocks are cut by coherent felsic dikes and plugs which may have been feeders to lava domes at the surface. Allowing for the difference in magma composition, felsic maar-diatreme volcanoes have many similarities with their ultramafic to mafic equivalents. Differences include a common association with felsic domes, inside the crater or just outside (Wau), although the domes within the crater may be destroyed during the eruption (Hoya de Estrada, Tepexitl); the dikes and plugs feeding and invading felsic diatremes seem larger; the processes of phreatomagmatic explosions involving felsic magmas may be different.
DS2003-0564
2003
Hayman, P.C.Hayman, P.C., Kopylova, M.G., Kaiminsky, F.V.Alluvial diamonds from Rio Soriso ( Juina, Brazl)8ikc, Www.venuewest.com/8ikc/program.htm, Session 3, POSTER abstractBrazilDiamonds, Deposit - Rio Soriso
DS2003-0565
2003
Hayman, P.C.Hayman, P.C., Kopylova, M.G., Kaminsky, F.V.Alluvial diamonds from the Rio Soriso ( Juina, Brazil)Geological Association of Canada Annual Meeting, Abstract onlyBrazilPlacers
DS200412-0807
2003
Hayman, P.C.Hayman, P.C., Kopylova, M.G., Kaminsky, F.V.Alluvial diamonds from the Rio Soriso ( Juina, Brazil).Geological Association of Canada Annual Meeting, Abstract onlySouth America, BrazilPlacers
DS200512-0410
2005
Hayman, P.C.Hayman, P.C., Kopylova, M.G., Kaminsky, F.V.Lower mantle diamonds from Rio Soriso (Juin a area, Mato Grosso, Brazil).Contributions to Mineralogy and Petrology, Vol. on lineSouth America, Brazil, Mato GrossoAlluvials, diamonds, analyses
DS200612-0229
2006
Hayman, P.C.Cas, R.A.F., Hayman, P.C., Pittari, A., Porritt, L.A.The problems with existing volcanological models and related terminology for kimberlite pipes.Emplacement Workshop held September, 5p. extended abstractGlobal, Africa, CanadaInterpretations, models, eruption processes
DS200612-0555
2006
Hayman, P.C.Hayman, P.C., Cas, R.A.F.The volcanology of the Muskox kimberlite: a pipe with a late stage coherent plug.Emplacement Workshop held September, 5p. extended abstractCanada, NunavutDeposit - MUskox kimberlite geology
DS200812-0458
2008
Hayman, P.C.Hayman, P.C., Cas, R.F., Johnson, M.Difficulties in distinguishing coherent from fragmental kimberlite: a case study of the Muskox pipe ( northern Slave Province, Nunavut, Canada).Journal of Volcanology and Geothermal Research, Vol. 174, 1-3, pp. 139-151.Canada, NunavutCoherent hypabyssal, gradational contact, alteration
DS200912-0289
2009
Hayman, P.C.Hayman, P.C., Cas, R.A.F., Johnson, M.Characteristics and alteration origins of matrix minerals in volcaniclastic kimberlite of the Muskox pipe, Nunavut Canada.Lithos, In press - available 48p.Canada, NunavutDeposit - Muskox
DS201012-0091
2009
Hayman, P.C.Cas, R.A.F., Porritt, L., Pittari, A., Hayman, P.C.A practical guide to terminology for kimberlite facies: a systematic progression from descriptive to genetic, including a pocket guide.Lithos, Vol. 112 S pp. 183-190.TechnologyTerminology
DS201112-0424
2011
Hayman, P.C.Hayman, P.C., Cas, R.A.F.Reconstruction of a multi-vent kimberlite eruption from deposit and host rock characteristics: Jericho kimberlite, Nunavut, Canada.Journal of Volcanology and Geothermal Research, Vol. 200, 3-4, March pp. 201-222.Canada, NunavutDeposit - Jericho , petrography, mineralogy
DS201112-0425
2011
Hayman, P.C.Hayman, P.C., Cas, R.A.F.Criteriz for interpreting kimberlite as coherent: insights from the Muskox and Jericho kimberlites ( Nunavut Canada).Bulletin Volcanology, in press available 23p.Canada, NunavutDeposit - Muskox, Jericho
DS200412-1197
2004
Hayne, M.Maes, J., Iakoubovskii, K., Hayne, M., Stesmans, A., Moshchalkov, V.V.Diamond as a magnetic field calibration probe.Journal of Physics D: Applied Physics, Vol. 37, 7, April 7, pp. 1102-1106.TechnologyGeophysics - magnetics
DS1997-0494
1997
Haynes, E.Haynes, E., Moecher, D.P.A calcite biotite serpentine perovskite xenolith from Elliott County, Kykimberlite: sample of primary melt.Geological Society of America (GSA) Abstracts, Vol. 29, No. 3, March 27-28, p. 22-3.KentuckyKimberlite, Deposit - Elliott County
DS1998-1026
1998
Haynes, E.A.Moecher, D.P., Haynes, E.A., Anderson, E.D., Cook, C.A.Petrogenesis of metamorphosed Grenville carbonatites, OntarioGeological Society of America (GSA) Annual Meeting, abstract. only, p.A26.OntarioPetrology, Carbonatite - genesis
DS2001-0462
2001
Haynes, E.A.Haynes, E.A., et al.Oxygen isotope analysis of carbonates, silicates and oxides in carbonatites: constraints on crystallizationJournal of South African Earth Sciences, Vol. 32, No. 1, p. A 19 (abs)Quebec, Arkansas, South Africa, OntarioCarbonatite, Oka, Magnet Cove, Jacupiranga, Grenville
DS2002-0683
2002
Haynes, E.A.Haynes, E.A., Moetcher, D.P., Spicuzza, M.J.Oxygen isotope contamination of carbonates, silicates and oxides in selected carbonatites: constraints on crystallization temperatures of carbonatitic magmas.Unknown, Vol. 193, 1-2, Jan 15, pp. 43-57.GlobalCarbonatite, Geochemistry
DS201112-0796
2011
Haynes, H.Piedra, M.M., Haynes, H., Hoey, T.B.The spatial distribution of coarse surface grains and the stability of gravel.Sedimentology, In press availableTechnologyGravel bedforms - not specific to diamonds
DS2001-0288
2001
Haynes, M.Eccles, D.R., Haynes, M., Csanyi, W.Diamond and metallic mineral potential of Peerless Lake map areaAlberta Geological Survey, www.ags.gov.ab.ca, ESR 00-08, 12.8 MB $ 20.AlbertaGeology - Peerless Lake
DS1995-0818
1995
Haynes, P.H.Holton, J.R., Haynes, P.H., McIntyre, M.E., Douglass, A.Stratosphere- Troposphere exchangeReviews of Geophysics, Vol. 33, No. 4, Nove, pp. 403-439GlobalGlobal change, Review
DS1920-0038
1920
Haynes, W.P.Moore, R.C., Haynes, W.P.An Outcrop of Basic I
 
 

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