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SDLRC - Scientific Articles all years by Author - Gr+


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 - Gr+
Posted/
Published
AuthorTitleSourceRegionKeywords
DS2002-0906
2002
GraafsmaKunz, M., Gillet, Fiquet, Sautter, Graafsma, ConradCombined in situ x-ray diffraction and raman spectroscopy on majoritic garnet inclusions in diamondsEarth and Planetary Science Letters, Vol.198,3-4,pp.485-93., Vol.198,3-4,pp.485-93.GlobalSpectroscopy, Diamond inclusions
DS2002-0907
2002
GraafsmaKunz, M., Gillet, Fiquet, Sautter, Graafsma, ConradCombined in situ x-ray diffraction and raman spectroscopy on majoritic garnet inclusions in diamondsEarth and Planetary Science Letters, Vol.198,3-4,pp.485-93., Vol.198,3-4,pp.485-93.GlobalSpectroscopy, Diamond inclusions
DS202009-1674
2020
Grababarczyk, A.Wiszniewska, J.B., Krzeminska, E., Petecki, Z., Grababarczyk, A., Demaiffe, D.Geophysical and petrological constraints for ultramafic-alkaline-carbonatite magmatism in the Tajno intrusion, NE Poland.Goldschmidt 2020, 1p. AbstractEurope, Polandcarbonatites

Abstract: This Tajno alkaline massif (together with the nearby Elk and Pisz intrusions) occurs beneath a thick Mesozoic- Cenozoic sedimentary cover. It has first been recognized by geophysical (magnetic and gravity) investigations, then directly by deep drilling (12 boreholes down to 1800 m). The main rock types identified as clinopyroxenites, syenites, carbonatites, have been cut by later multiphase volcanic /subvolcanic dykes. This massif was characterized as a differentiated ultramafic, alkaline and carbonatite complex, quite comparable to the numerous massifs of the Late Devonian Kola Province of NW Russia [1,2]. Recent geochronological data (U-Pb on zircon from an albitite and Re-Os on pyrrhotite from a carbonatite) indicate that the massif was emplaced at ca. 348 Ma (Early Carboniferous). All the rocks, but more specifically the carbonatites, are enriched in Sr, Ba and LREE, like many carbonatites worldwide but depleted in high field strength elements (Ti, Nb, Ta, Zr). The initial 87Sr/86Sr (0.70370 to 0.70380) and eNd(t) (+3.3 to +0.7) isotopic compositions of carbonatites plot in the depleted quadrant of the Nd-Sr diagram, close to “FOcal ZOne” (FOZO) deep mantle domain [1]. The Pb isotopic data (206Pb/204Pb <18.50) do not point to an HIMU (high U/Pb) source. The ranges of C and O stable isotopic compositions of the carbonatites are quite large; some data plot in (or close to) the “Primary Igneous Carbonatite” box while others extend to much higher, typically crustal d18O and d13C values.
DS2002-0890
2002
Grabezhev, A.I.Korobeinikov, A.F., Grabezhev, A.I., Moloshag, V.P.The behaviour of Pt, Pd and au during the formation of porphyry gold copper systems: evidence from ...Doklady, Vol.383A.March-April pp. 314-7.RussiaGold, copper, platinum, palladium, Deposit - Tominsk Michurinsk
DS1982-0224
1982
Grabkin, O.V.Grabkin, O.V., Zamareyev, S.M., Melnikov, A.I.The Correlation of Endogene Processes of the Siberian Platform and its Framework.Izd. Nauka Sib. Otd. Novosibirsk, Sssr., 129P.Russia, SiberiaKimberlite, Zoning, Diamonds, Genesis
DS2001-0401
2001
Grabowska, T.Grabowska, T., Bojdys, G.The border of the East European Craton in south Eastern Poland based on gravity and magnetic data.Terra Nova, Vol. 13, pp. 92-98.Poland, EuropeGeophysics - gravity, Craton
DS2001-0402
2001
Grabowski, G.Grabowski, G.Diamond potential of lamprophyre in the Lake Temiskaming structural zoneOntario Geological Survey, Northeastern Mineral Symposium, p. 6-8, abstract.OntarioDike - petrology
DS2003-0048
2003
Grabowski, G.Atkinson, B.T., Wilson, A.C., Grabowski, G.An overview of Ontario diamond exploration 2003Quebec Exploration Conference, Nov. 25-27, 1p. abstractOntarioOverview - De Beers, Sudbury Contact, Pele Mountain
DS200412-0070
2003
Grabowski, G.Atkinson, B.T., Wilson, A.C., Grabowski, G.An overview of Ontario diamond exploration 2003.Quebec Exploration Conference, Nov. 25-27, 1p. abstractCanada, OntarioOverview - De Beers, Sudbury Contact, Pele Mountain
DS2002-1560
2002
Grabowski, G.P.B.Stott, G.M., Ayer, J.A., Wilson, A.C., Grabowski, G.P.B.Are the Neoarchean diamond bearing breccias in the Wawa area related to late orogenic alkalic and sunkitoid intrusions?Ontario Geological Survey Open File, Summary of Field Work, No. 6100, pp. 9-1-10.Ontario, WawaDykes, lamprophyres
DS200512-0359
2005
Grabowski, G.P.B.Grabowski, G.P.B., Wilson, A.C.Sampling lamprophere dikes for diamonds: discover Abitibi initiative.Ontario Geological Survey, Open file 6170, 262p. $ 21.00Canada, OntarioGeochemistry - lamprophyres
DS200612-0485
2005
Grabowski, G.P.B.Grabowski, G.P.B., Wilson, A.C.Sampling lamprophyre dikes for diamonds: Discover Abitibi Initiative Project.Ontario Geological Survey, Open File, 6170, 262p.Canada, OntarioGeochemistry
DS1987-0229
1987
Grace, J.D.Fults, M.E., Grace, J.D.Trace element geochemistry of the Lake Ellen kimberlite, Crystal Falls, MichiganGeological Society of America, Vol. 19, No. 4, March p. 199 (abstract)MichiganUSA, Geochemistry
DS1990-0591
1990
Grace, K.Grace, K., Spooner, J.The economics of the rare earth elementsThe Canadian Institute of Mining, Metallurgy and Petroleum (CIM) Annual Meeting Paper preprint, No. 8, 15pGlobalEconomics, Rare earths-excellent overview
DS1997-0434
1997
Grace, K.Grace, K.Mineral reporting practices in Canada vs elsewhereDeveloping Indonesia-Canada Cooperation Nov.3-4, Jakarta, 15p. PEO 13p. Nat Policy 2A 5pCanadaLegal - mining laws, policy, Mineral agreement, investment, contracts, economics
DS1989-0531
1989
Grace, K.A.Grace, K.A.Tax incentives are key to survival of Canadian mineral explorationMining Engineering, Vol. 41, No. 2, February pp. 92-94. Database # 17676CanadaEconomics, CEIP
DS1992-0597
1992
Grace, K.A.Grace, K.A.Competing for the exploration dollar: why Canada?Pda Digest, Vol. 6, No. 28, Summer p. 5, 6CanadaEconomics, Ore reserves, Exploration dollars
DS1996-0556
1996
Grachev, A.F.Grachev, A.F., et al.Tensor characteristics of neotectonic flexural deformations and of curvature lithospheric basementDoklady Academy of Sciences, Vol. 343A No. 6, June pp. 46-53.Russia, East EuropeanEast European Platform, Tectonics
DS200412-0704
2003
Grachev, A.F.Grachev, A.F.Identification of mantle plumes based on studying the composition of volcanic rocks and their isotopic geochemical characteristiPetrology, Vol. 11, 6, pp. 562-596.MantleGeochemistry - plumes
DS200412-0705
2003
Grachev, A.F.Grachev, A.F.The Arctic rift system and the boundary between the Eurasian and North American lithospheric plates: new insight to plate tectonRussian Journal of Earth Sciences, Vol. 5, 5, Oct. pp. 307-345.Russia, Europe, CanadaTectonics
DS1990-0592
1990
Gracie, A.J.Gracie, A.J., Schwann, P.L.Saskatachewan...brief overview of activities. Diamonds one paragraph ( 25lines) overviewPda Exploration And Development Highlights 1989, p. 39SaskatchewanNews item, Diamond exploration -brie
DS2001-0403
2001
Gracie, A.J.Gracie, A.J., Tourigny, G.Diamonds: Candle Lake, Fort a la Corne, StarSaskatchewan Exploration and Dev. Highlights 2000, pp. 10-14.SaskatchewanNews item, Diamond exploration
DS1995-0670
1995
Grad, M.Grad, M., Tripolsky, A.A.Crustal structure from P and S seismic waves and petrological models of the Ukrainian shield.Tectonophysics, Vol. 250, No. 1/3, Nov. 15, pp. 89-112.UKraineTectonics, Geophysics -seismics
DS200712-0088
2006
Grad, M.Bogdanova, S., Gorbatschev, R., Grad, M., Janik, T., Guterch, A., Kozlovskaya, E., Motuza, G., SkridaiteEUROBRIDGE: new insight into the geodynamic evolution of the East European Craton.Geological Society of London Memoir, No. 32, pp. 599-626.EuropeCraton
DS201501-0012
2014
Grad, M.Grad, M., Tiira, T., Olsson, S., Komminaho, K.Seismic lithosphere asthenosphere boundary beneath the Baltic Shield.GFF, Vol. 136, 4, pp. 581-598.Europe, Finland, Sweden, NorwayGeophysics - seismic

Abstract: The problem of the existence of the asthenosphere for old Precambrian cratons is still discussed. In order to study the seismic lithosphere-asthenosphere boundary (LAB) beneath the Baltic Shield, we used records of nine local earthquakes with magnitudes ranging from 2.7 to 5.9. To model the LAB, original data were corrected for topography and Moho depth using a reference model with a 46-km-thick crust. For two northern events at Spitsbergen and Novaya Zemlya, we observe a low-velocity layer, 60-70-km-thick asthenosphere, and the LAB beneath Barents Sea was found at depth of c. 200 km. Sections for other events show continuous first arrivals of P-waves with no evidence for "shadow zone" in the whole range of registration, which could either be interpreted as the absence of the asthenosphere beneath the central part of the Baltic Shield, or that the LAB in this area occurs deeper (>200 km). The relatively thin low-velocity layer found beneath southern Sweden, 15 km below the Moho, could be interpreted as small-scale lithospheric heterogeneities, rather than asthenosphere. Differentiation of the lower lithosphere velocities beneath the Baltic Shield could be interpreted as regional heterogeneity or as anisotropy of the Baltic Shield lithosphere, with high velocities approximately in the east-west direction, and slow velocities approximately in the south-north direction.
DS200412-0706
2004
Gradstein, F.M.Gradstein, F.M., et al.A geological timescale.Geological Survey of Canada, Miscellaneous Report 18, 1 CD $ 6.50TechnologyPoster - timescale
DS1970-0298
1971
Grady, J.C.Grady, J.C.Deep Main Faults in South IndiaGeological Society INDIA Journal, Vol. 12, No. 1, PP. 56-62.IndiaGeotectonics, Regional Structure
DS1987-0811
1987
Grady, M.M.Wright, I.P., Grady, M.M.Meteorites- diamonds are foreverNature, Vol. 326, No. 6115, April 23, pp. 739-740GlobalMeteorite
DS1996-0557
1996
Grady, M.M.Grady, M.M.Meteorites: their flux with time and impact effectsGeoscientist, Vol. 7, No.1, pp. 8-12GlobalMeteorites
DS1998-1068
1998
Grady, M.M.NcCall, G.J.H., Grady, M.M., Hutchison, R.Meteorites - flux with time, impact effectsGeological Society of London Spec. Pub, No. 140, 272p. $ 115.00GlobalBook - ad, Meteorites
DS1920-0186
1924
Graeber, C.K.Honess, A.P., Graeber, C.K.A New Occurrence of an Igneous Dike in Southwestern Pennsylvania.American Journal of Science, SER. 5, Vol. 7, PP. 313-315.United States, Appalachia, PennsylvaniaDixonville, Indiana County, Related Rocks, Geology
DS1920-0284
1926
Graeber, C.K.Honess, A.P., Graeber, C.K.Petrography of the Mica Peridotite Dike at Dixonville, Pennsylvania #2American Journal of Science, SER. 5, Vol. 12, PP. 484-494.United States, Appalachia, PennsylvaniaPetrography, Related Rocks
DS1920-0285
1926
Graeber, C.K.Honess, A.P., Graeber, C.K.Petrography of the Mica Peridotite Dike at Dixonville, Pennsylvania #1Pennsylvania State Coll. Min. Met. Exploration Bulletin., No. 2, 16P.United States, Appalachia, PennsylvaniaRelated Rocks, Petrography
DS1992-0598
1992
Graebner, J.E.Graebner, J.E., Jin, S., Kammlott, G.W., Herb, J.A., Gardiner, C.F.Large anisotropic thermal conductivity in synthetic diamond filmsNature, Vol. 359, No. 6394, October 1, pp. 401-402GlobalDiamond synthesis, CVD.
DS201502-0058
2015
Graedel, T.E.Graedel, T.E., Nassar, N.T.The criticality of metals: a perspective for geologists.In: Ore deposits of an evolving Earth, Geological Society of London,, Special Publication no. 393, pp. 291-302.GlobalEconomics
DS201504-0226
2015
Graettinger, A.HValentine, G.A., Graettinger, A.H, Macorps, E., Ross, P-S., White, J.D.L., Dohring, E., Sonder, I.Experiments with vertically and laterally migrating subsurface explosions with applications to the geology of phreatomagmatic and hydrothermal explosion craters and diatremes.Bulletin of Volcanology, Vol. 77, 15p.TechnologyDiatremes, kimberlites
DS201504-0227
2014
Graettinger, A.HValentine, G.A., Graettinger, A.H, Sonder, I.Explosion depths for phreatomagmatic eruptions.Geophysical Research Letters, Vol. 41, pp. 3045-51.TechnologyMagmatism - phreatomagmatic
DS1995-2034
1995
Graf, C.Waskett-Myers, M., Graf, C.Geochemical sampling and geological report on southwestern Alberta mineralpermits.Alberta Geological Survey, MIN 19950031AlbertaExploration - assessment, Ecstall Mining Corp.
DS201910-2260
2019
Graf, C.Graf, C., Sandner, T., Woodland, A., Hofer, H., Seitz, H-M., Pearson, G., Kjarsgaard, B.Metasomatism, oxidation state of the mantle beneath the Rae craton, Canada.Goldschmidt2019, 1p. AbstractCanadacraton

Abstract: The Rae craton is an important part of the Canadian Shield and was amalgamated to the Slave craton at ?? 1.9 Ga [1]. Recent geophysical and geochemical data indicate a protracted geodynamic history [1, 2]. Even though the oxidation state of the Earth’s mantle has an important influence of fluid compositions and melting behavior, no data on the oxidation state of the Rae’s mantle are available. The aims of this study were to 1) determine the oxidation state (ƒO2) of the lithosphere beneath the Rae craton, 2) link these results to potential metasomatic overprints and 3) compare the geochemical evolution with the Slave craton. We studied 5 peridotite xenoliths from Pelly Bay (central craton) and 22 peridotites from Somerset Island (craton margin). Pelly Bay peridotites give T < 905°C and depths of ??80- 130 km. Garnets have depleted or “normal” REE patterns, the latter samples recording fO2 values ??0.5 log units higher. The deeper samples are more enriched and oxidised. Peridotites from Somerset Island record T ??825-1190°C, a ?logfO2 ranging from ?? FMQ - FMQ-3.6 from a depth interval of ??100-150 km. Garnets exhibit two REE signatures - sinusoidal and “normal” - indicating an evolutionary sequence of increasing metasomatic re-enrichment and a shift from fluid to melt dominated metasomatism. Compared to the Slave craton, the Rae mantle is more reduced at ??80km but becomes up to 2 log units more oxidised (up to ??FMQ-1) at ??100-130 km. Similar oxidising conditions can be found >140 km in the Slave mantle [3]. Especially under Somerset Island, the lithospheric mantle has contrasting fO2 and metasomatic overprints in the same depth range, which may represent juxtaposed old and rejuvenated domains [2].
DS1988-0265
1988
Graf, G.Graf, G., Will, G.The influence of graphitization on the diamond synthesisTerra Cognita, Vol. 8, No. 1, Winter 1988 p. 64. Abstract onlyGlobalBlank
DS1984-0206
1984
Graf, J.L.Cullers, R.L., Graf, J.L.Rare Earth Elements in Igneous Rocks of the Continental Crust: Predominantly Basic and Ultrabasic Rocks.Rare Earth Geochemistry Edited By Henderson, P. Elsevier Dev, CHAPTER 7, PP. 237-251.GlobalKimberlite, Lamproite, Rare Earth Elements (ree)
DS1960-1084
1969
Graf, P.R.Bryhni, I., Bolingsberg, H.J., Graf, P.R.Eclogites in Quartzo-feldspathic Gneiss of Nordfiord, West Norway.Norsk Geol. Tidsskr., Vol. 49, PP. 194-225.Norway, ScandinaviaPetrography
DS1983-0260
1983
Graff, L.Graff, L.Graff Offers 70 Carat HeartJewellers Circular Keystone, Vol. 154, No. 10, OCTOBER P. D.West AfricaDiamonds Notable
DS1991-0683
1991
Graff, P.J.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
DS202008-1422
2020
Graff, T.G.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.
DS202011-2047
2020
Graff, T.G.Kilgore, M.L., Peslier, A.H., Brandon, A.D., Schaffer, L.A., Morris, R.V., Graff, T.G., Agresti, D.G., O'Reilly, S.Y., Griffin, W.L., Pearson, D.G., Barry, K.G., Shaulis, 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, Vol. 286, pp. 29-83. pdfCanada, Northwest Territoriesxenoliths

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.
DS200512-0156
2005
Graffe, E.Channer, D., Graffe, E., Vielma, P.Geology, mining and mineral potential of southern Venezuela. Diamonds pp. 19-20. Guaniamo area.SEG Newsletter, No. 62, July, pp. 5,13-23.South America, VenezuelaHistory, geology
DS1992-0875
1992
Graham, A.P.Klein, B.W., Graham, A.P., Peterson, S.D.Mining in 1992: a cautious optimism. (United States)Minerals Today, February pp. 6-11United StatesMining, Economics
DS1994-0648
1994
Graham, C.Graham, C., et al.The nature and scale of stable isotope disequilibrium in the mantle: ion and laser microprobe evidence.Mineralogical Magazine, Vol. 58A, pp. 345-346. AbstractMantleGeochronology
DS1990-0443
1990
Graham, C.M.Elphick, S.C., Graham, C.M.Hydrothermal oxygen diffusion in diopside at 1 KB, 900-1200C, a comparison with O diffusion in forsterite, and constraints on OI disequil. in peridotitenodulesTerra, Abstracts of Experimental mineralogy, petrology and, Vol. 2, December abstracts p. 72GlobalExperimental petrology, Kimberlite -peridotite
DS1995-0237
1995
Graham, C.M.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
DS2001-0899
2001
Graham, C.M.Peck, W.H., Valley, J.W., Wilde, S.A., Graham, C.M.Oxygen isotope ratios and rare earth elements in 3.3 - 4.4 Ga zircons: ion microprobe evidence high 0 18...Geochimica et Cosmochimica Acta, Vol. 65, No. 22, pp. 4215-29.AustraliaGeochronology, Craton - Yilgarn
DS2001-1236
2001
Graham, C.M.Wilde, S.A., Valley, J.W., Graham, C.M.Evidence from detrital zircon for the existence of continental crust and ocean in the earth 4.4 Gyr ago.Nature, Vol. 409, No. 6817, Jan. 11, p. 175-7.MantleGeochronology
DS1999-0231
1999
Graham, D.Furman, T., Graham, D.Erosion of lithospheric mantle beneath the East African Rift system:geochemical evidence from Kivu volcanicsLithos, Vol. 48, No. 1-4, Sept. pp. 237-62.East Africa, KenyaGeochemistry, Lithosphere
DS201412-0309
2014
Graham, D.Graham, D.Mantle geochemistry: small scale stirrings.Nature Geoscience, Vol. 7, July 20, pp. 556-558.MantleGeodynamics
DS1991-0597
1991
Graham, D.F.Graham, D.F., Grant, D.R.A test of airborne, side looking synthetic -aperture radar in central Newfoundland for geological reconnaissanceCanadian Journal of Earth Sciences, Vol. 28, No. 2, February pp. 257-265NewfoundlandRemote sensing, Overview
DS1993-0566
1993
Graham, D.F.Graham, D.F., Bonhamcaon, G.F.Airborne radiometric dat a - a new tool for reconnaissance geological mapping using a GISPhotogrammetry E.R., Vol. 59, No. 8, August, pp. 1243-1249GlobalGIS, Geophysics -radiometric data
DS1994-0649
1994
Graham, D.F.Graham, D.F.Airborne SAR for surficial geological mappingCanadian Journal of Remote Sensing, Vol. 20, No. 3, pp. 319-323CanadaRemote sensing, Alluvials
DS1996-1541
1996
Graham, D.F.Wilkinson, L., Budkewitsch, P., Graham, D.F., HendersonAlternative methods of base map generation using remote sensing and GIS: a pilot study western Churchill ProvinceGeological Survey of Canada Current Research, No. 1997-C, pp. 81-90.Northwest TerritoriesRemote sensing, GIS
DS1997-0435
1997
Graham, D.F.Graham, D.F., Moretzsohn, J.S.Airborne radar data: utility for geological mapping in tropicalenvironments, Serra Pelada, para BrasilThe Canadian Mining and Metallurgical Bulletin (CIM Bulletin), Vol. 90, No. 1011, June pp. 108-113Brazil, Central African RepublicBanded iron formation, Remote Sensing
DS1994-1047
1994
Graham, D.P.Long, R.E., Matthews, P.A., Graham, D.P.The nature of crustal boundaries: combined interpret.of wide angle and normal incidence seismic dataTectonophysics, Vol. 232, pp. 309-318GlobalGeophysics -seismics, Crustal boundaries
DS1994-1048
1994
Graham, D.P.Long, R.E., Matthews, P.A., Graham, D.P.The nature of crustal boundaries: combined interpret. of wide angle and normal incidence seismic data.Tectonophysics, Vol. 232, pp. 309-318.GlobalGeophysics -seismics, Crustal boundaries
DS1995-0671
1995
Graham, D.W.Graham, D.W.Helium, lead, strontium and neodynmium isotope variations in mafic volcanic rocks East African RiftEos, Vol. 76, No. 46, Nov. 7. p.F686. Abstract.GlobalGeochronology
DS1996-1172
1996
Graham, D.W.Reid, M.R., Graham, D.W.Resolving lithospheric and sub lithospheric contributions to helium isotopevariations...Earth and Planetary Science Letters, Vol. 144-1, 2, Oct pp. 213-222.United StatesGeochronology, Lithosphere
DS200512-0360
2005
Graham, D.W.Graham, D.W.Neon illuminates the mantle.Nature, no. 7021, Jan. 6, p. 25.MantleGeochronology
DS200612-0486
2006
Graham, D.W.Graham, D.W., Blichert Toft, J., Russo, C.J., Rubin, K.H., Albarede, F.Cryptic striations in the upper mantle revealed by hafnium isotopes in southeast Indian Ridge basalts.Nature, Vol. 440, 7081, pp. 199-202.Asia, IndiaGeochronology, tectonics
DS200712-0101
2007
Graham, D.W.Brandon, A.D., Graham, D.W., Waight, T., Gautason, B.188 Os amd 187 Os enrichments and high 3He 4He sources in the Earth's mantle evidence from Iclandic picrites.Geochimica et Cosmochimica Acta, Vol. 71, 18, Sept. pp. 4570-91.Europe, IcelandPicrite
DS200712-0102
2007
Graham, D.W.Brandon, A.D., Graham, D.W., Waight, T., Gautason, B.Os He isotope systematics of Iceland picrites: evidence for a deep origin of the Iceland plume.Plates, Plumes, and Paradigms, 1p. abstract p. A119.Europe, IcelandPicrite
DS200712-1127
2007
Graham, D.W.Waight, T., Brandon, A.D., Graham, D.W., Gautason, B.Isotopic constraints on picritic magmatism, Iceland.Plates, Plumes, and Paradigms, 1p. abstract p. A1078.Europe, IcelandPicrite
DS201412-0310
2014
Graham, D.W.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
DS1989-0103
1989
Graham, E.K.Ben Yan, Graham, E.K., Furlong, K.P.Lateral variations in upper mantle thermal structure inferred from three dimensional seismic inversion modelsGeophysical Research Letters, Vol. 16, No. 5, May pp. 449-452GlobalMantle, Seismics -Geophysics
DS200612-1021
2006
Graham, G.R.Oshust, P.A., Graham, G.R., Carlson, J.A.Comparisons of the geology and proposed underground mining methods of the PAnd a and Koala kimberlites at the Ekati diamond mine.CIM Conference and Exhibition, Vancouver - Creating Value with Values, List of talks CIM Magazine, Feb. p. 78.Canada, Northwest TerritoriesMining - Ekati Panda, Kaola
DS200712-0792
2006
Graham, G.R.Oshust, P.A., Carelson, J.A., Graham, G.R., Nowicki, T.E.Comparisons of the geology and proposed underground mining methods of the PAnd a and Kaola kimberlites at the Ekati diamond mine.34th Yellowknife Geoscience Forum, p. 41-42. abstractCanada, Northwest TerritoriesMining methods
DS1998-0176
1998
Graham, I.Bryan, D., Burgess, J., Graham, I., Ravenscroft, P.The Diavik kimberlites - Lac de Gras, Northwest Territories, Canada.Calgary Mining Forum, Apr. 8-9, p. 40-2. abstractNorthwest TerritoriesGeology, Deposit - Diavik
DS1998-0528
1998
Graham, I.Graham, I., Burgess, bryan, Ravenscroft, Thomas, DoyleThe Diavik kimberlites - Lac de Gras, Northwest Territories, Canada7th International Kimberlite Conference Abstract, pp. 259-61.Northwest TerritoriesHistory, kimberlite, evaluation, Deposit - Diavik
DS201502-0123
2014
Graham, I.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
Graham, I.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.
DS201605-0907
2016
Graham, I.Sutherland, L., Graham, I., Yaxley, G., Armstrong, R.Major zircon megacryst suites of the Indo-Pacific lithospheric margin (ZIP) and their petrogenetic and regional implications.Mineralogy and Petrology, Vol. 110, 2, pp. 399-420.IndonesiaMegacrysts

Abstract: Zircon megacrysts (± gem corundum) appear in basalt fields of Indo-Pacific origin over a 12,000 km zone (ZIP) along West Pacific continental margins. Age-dating, trace element, oxygen and hafnium isotope studies on representative zircons (East Australia-Asia) indicate diverse magmatic sources. The U-Pb (249 to 1 Ma) and zircon fission track (ZFT) ages (65 to 1 Ma) suggest thermal annealing during later basalt transport, with?
DS201607-1350
2016
Graham, I.Graham, I., Groat, L., Giuliani, G.Gems: bringing the world together,IGC 35th., Session Mineralogy 1 p. abstractTechnologyMineralogy
DS1994-0650
1994
Graham, I.T.Graham, I.T., Franklin, B.J., Marshall, B.Evidence and timing of remobilization in upper mantle peridotiteGeological Society of Australia Abstract Volume, No. 37, pp. 143.MantlePeridotite
DS200812-0426
2007
Graham, I.T.Graham, I.T., Spencer, L., Yaxley, G., Barron, L.The use of zircon in diamond exploration - a preliminary case study from the Cempaka deposit, SE Kalimantan, Indonesia.Geological Society of Australia Abstracts, No. 86, pp. 32-35.IndonesiaDeposit - Cempaka
DS1860-0661
1890
Graham, J.B.Graham, J.B.The Kimberley Diamond Mines (1890)Century, JULY, P.Africa, South AfricaHistory
DS1990-0593
1990
Graham, R.Graham, R., Buseck, P.R.Cathodluminescence of colored diamonds by transmissionelectronmicroscopyGeological Association of Canada (GAC)/Mineralogical Association of Canada (MAC) Vancouver 90 Program with Abstracts, Held May 16-18, Vol. 15, p. A50. AbstractGlobalDiamond morphology, Cathodluminescence
DS1994-0651
1994
Graham, R.J.Graham, R.J., Buseck, P.R.Cathodluminescence of brown diamonds as observed by transmission electronmicroscopy.Phil. Magazine B., Vol. 70, No. 6, Dec. pp. 1177-1185.GlobalDiamond morphology, Cathodluminescence
DS1910-0558
1918
Graham, R.P.D.Poitevin, E., Graham, R.P.D.Contribution to the Mineralogy of Black Lake Area, QuebecGeological Survey of Canada (GSC) MUSEUM Bulletin., No. 27; ( GEOL. SERIES No. 35) 103P.Canada, QuebecBlank
DS1990-0594
1990
Graham, S.Graham, S.Subsidies: encouraging exploration and wasteCrs Perspectives, No. 32, March pp. 17-22CanadaEconomics, Flow-through
DS1990-0937
1990
Graham, S.Liou, J.G., Maruyama, S., Wang, X., Graham, S.Precambrian blueschist terranes of the worldTectonophysics, Vol. 181, pp. 97-111Alaska, Scandinavia, ChinaTerranes, Blueschist
DS1996-0558
1996
Graham, S.Graham, S.Source regions for Norseman and Lara melnoites, western Australia: trace elements and Rb Sr Sm ND and Re OSGeological Society of Australia 13th. Convention held Feb., No. 41, abstracts p.162.AustraliaGeochronology, Yilgarn Craton, Melnoites
DS1996-0559
1996
Graham, S.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
DS1997-0436
1997
Graham, S.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
DS1998-0529
1998
Graham, S.Graham, 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
DS1998-0530
1998
Graham, S.Graham, S., Lambert, D.D., Smith, C.B., Shee, ReevesRhenium- Osmium (Re-Os) isotope systematics of oxide xenocrysts and peridotite xenoliths From the kimberlites - Argyle7th International Kimberlite Conference Abstract, pp. 265-7.AustraliaMantle - lithosphere, lamproite, Deposit - Argyle
DS1999-0261
1999
Graham, S.Graham, S., Lambert, D., Shee, S., Smith, C.B., ReevesRe Os isotopic evidence for Archean lithospheric mantle beneath the Kimberley Block, Western Australia.Geology, Vol. 27, No. 5, May pp. 431-34.AustraliaGeochronology, Deposit - Argyle, Seppelt
DS2002-0606
2002
Graham, S.Graham, S., Lambert, D.D., Shee, S.R., Pearson, N.J.Juvenile lithospheric mantle enrichment and the formation of alkaline ultramafic magmaChemical Geology, Vol. 186, No. 2-4, pp. 215-33.Australia, westernMelnoites, Geochronology
DS2003-0492
2003
Graham, S.Graham, S., Lambert, D.D., Shee, S.R.Geochemical and isotopic evidence of a kimberlite - melnoite - carbonatite genetic link8 Ikc Www.venuewest.com/8ikc/program.htm, Session 7, AbstractAustraliaKimberlite petrogenesis, Geochronology, Leonora alkalic province
DS2003-0493
2003
Graham, S.Graham, S., Lambert, D.D., Shee, S.R., Pearson, N.J.Erratum to juvenile lithospheric mantle enrichment and the formation of alkalineChemical Geology, Vol. Sept. 15, p.. 361. Original Vol. 186, pp. 215-233.AustraliaMelnoites, Geochronology
DS200412-0145
2004
Graham, S.Beyer, E.E., Brueckner, H.K., Griffin, W.L.,O'Reilly, S.Y., Graham, S.Archean mantle fragments in Proterozoic crust, Western Gneiss region, Norway.Geology, Vol. 32, 7, July pp. 609-612.Europe, NorwayGarnet peridotites
DS200412-0707
2003
Graham, S.Graham, S., Lambert, D.D., Shee, S.R.Geochemical and isotopic evidence of a kimberlite - melnoite - carbonatite genetic link.8 IKC Program, Session 7, AbstractAustraliaKimberlite petrogenesis Geochronology, Leonora alkalic province
DS200412-0708
2003
Graham, S.Graham, S., Lambert, D.D., Shee, S.R., Pearson, N.J.Erratum to juvenile lithospheric mantle enrichment and the formation of alkaline ultramafic magma sources: Re Os Lu Hf and Sm NdChemical Geology, Vol. Sept. 15, p.. 361. Original Vol. 186, pp. 215-233.AustraliaMelnoites, geochronology
DS200412-0722
2004
Graham, S.Griffin, W.L., Graham, S., O'Reilly, S.Y., Pearson, N.J.Lithosphere evolution beneath the Kaapvaal Craton: Re-Os systematics of sulfides in mantle derived peridotites.Chemical Geology, Vol. 208, 1-4, pp. 89-118.Africa, South Africa, LesothoGeochronology, Finsch, Kimberley, Jagersfontein
DS2001-1287
2001
Graham, S.A.Yue, Y., Liou, J.G., Graham, S.A.Tectonic correlation of Beishan and Inner Mongolian orogens and its implications for the palinspastic ...Geological Society of America Memoir, No. 194, pp. 101-16.China, MongoliaTectonics - reconstruction of north China
DS2003-0494
2003
Graham, T.Graham, T.TSX Venture Exchange - Canada's public venture capital marketplacePdac Short Course: Comparison Of Listing Requirements For Emerging Mineral, March 12, 17p. text and slidesCanada, OntarioLegal - exchange
DS1910-0415
1914
Grahame, L.Grahame, L.The Diamond Industry and a Review of its Position and Prospects.Jewellers Circular Keystone, Vol. 69, No. 9, SEPT. 30TH. PP. 59, 61, 63, 65.South AfricaMining Economics
DS1900-0188
1903
Graichen, W.Graichen, W.Ist die Zuruckhaltung Unseres Gross kapitals Bei der Entwicklung der Gibeon Diamant Minen Berechtigt?Deut. Kolon. Zeitung, PP. 228-229.Africa, NamibiaHistory, Politics
DS1900-0189
1903
Graichen, W.Graichen, W.Die Newlands Diamantinen SuedafrikaZeitschr. F. Prakt. Geol., Vol. 11, PP. 448-452. ALSO: GEOL. CENTRALL BL., Vol. 6, P. 4South Africa, Griqualand WestGeology, Newland Mine, Kimberlite
DS2002-0607
2002
Grainger, C.J.Grainger, C.J., Groves, D.I., Costa, C.H.G.The epigenetic sediment hosted Serra Pelada au PGE deposit and its potential genetic association ....Society of Economic Geologists Special Publication, No.9,pp.47-64.Brazil, Amazon CratonGold, platinum, iron oxide copper mineralization, Deposit - Serra Pelada, Carajas
DS1982-0225
1982
Grainger, E.Grainger, E.The Remarkable Reverend Clarke; the Life and Times of the Father of Australian Geology.Melbourne: Oxford University Press, 292P.AustraliaKimberley, History, Biography
DS201802-0237
2017
Grakhanov, O.S.Garanin, K.V., Serov, I.V., Nikiforova, A.Yu., Grakhanov, O.S.The ALROSA geological prospecting complex and the analysis of the base for the diamond mining in Russian Federation to 2030. *** IN RUSStarosin, V.I. (ed) Problems of the mineralogy, economic geology and mineral resources. MAKS Press, Moscow *** IN RUS, pp. 22-40.Russiatechnology
DS2003-0495
2003
Grakhanov, S.A.Grakhanov, S.A., Koptil, V.I.Triassic diamond placers on the northeastern Siberian PlatformRussian Geology and Geophysics, Vol. 44, No. 11, pp. 1150-1161Northwestern Siberian Platformplacer deposits
DS200512-0361
2003
Grakhanov, S.A.Grakhanov, S.A., Koptil, V.I.Triassic diamond placers on the northeastern Siberian platform.Russian Geology and Geophysics, Vol. 44, 11, pp. 1150-1161.Russia, SiberiaAlluvials
DS200612-0487
2005
Grakhanov, S.A.Grakhanov, S.A.New dat a on the distribution of diamonds with lonsdaleite admixture in the northeastern Siberian Craton.Doklady Earth Sciences, Vol. 405A, 9, Nov-Dec. pp. 1309-1312.RussiaDiamond mineralogy
DS200812-0427
2007
Grakhanov, S.A.Grakhanov, S.A., Yadrenkin, A.V.Prediction of the diamond potential of Triassic rocks in Taimyr.Doklady Earth Sciences, Vol. 417, 8, pp. 1147-1150.RussiaDiamond genesis
DS201012-0247
2010
Grakhanov, S.A.Grakhanov, S.A., Malanin, Yu.A., Pavlov, Afanasev, Pokhilenko, Gerasimchuk, LipashovaRhaetian diamond placers in Siberia.Russian Geology and Geophysics, Vol. 51, pp. 127-135.Russia, Yakutia, SakhaAlluvials
DS201602-0206
2016
Grakhanov, S.A.Grakhanov, S.A., Zinchuk, N.N., Sobolev, N.V.The age of predictable primary diamond sources in the northeastern Siberian platform.Doklady Earth Sciences, Vol. 465, 2, pp. 1297-1301.Russia, SiberiaDeposit - Malokuonapskaya

Abstract: The U-Pb (SHRIMP) age was determined for zircons collected from 26 observation and sampling sites of diamonds and index minerals in the northeastern Siberian Platform. This part of the region hosts 15 low-diamondiferous Paleozoic and Mesozoic kimberlite fields, excluding the near economic Triassic Malokuonapskaya pipe in the Kuranakh field. Four epochs of kimberlite formation (Silurian, Late Devonian to Early Carboniferous, Middle to Late Triassic, and Middle to Late Jurassic) of the Siberian Platform, including its northeastern part, are confirmed as a result of our studies. Most observation points, including economic Quaternary diamond placers, contain Middle to Late Triassic zircons, which confirms the abundant Late Triassic volcanism in this region. The positive correlation of diamonds and major index minerals of kimberlites (mostly, garnets) at some observation sites indicates the possible Triassic age of the predictable diamondiferous kimberlites.
DS201412-0311
2014
Grakova, O.Grakova, O.Geological characteristics of diamond bearing terrigenous rocks in the north-east borderland of the East European platform.ima2014.co.za, PosterRussiaGeology
DS1991-0598
1991
Gramaccioli, C.M.Gramaccioli, C.M.Application of mineralogical techniques to GemologyEuropean Journal of Mineralogy, Vol. 3, No. 4, pp. 703-706GlobalGemology -general, Brief overview
DS1989-0532
1989
Grambling, J.A.Grambling, J.A., Tewksbury, B.J.Proterozoic geology of the Southern Rocky MountainsGeological Society of America (GSA) Special Paper, No. 235, 176p. $ 27.50Wyoming, Colorado, Utah, New mexico, ArizonaGeochronology, Tectonics
DS1997-0571
1997
Grambling, J.A.Karlstrom, K.E, Dallmeyer, R.D., Grambling, J.A.Ar-Ar evidence for 1.4 Ga regional metamorphism in New Mexico: Implications for thermal evolution of lithosph.Journal of Geology, Vol. 105, No. 2, March pp.205-223.United States, New MexicoThermal evolution, Argon, Lithosphere
DS200812-0786
2008
GramboleNasdala, L., Gigler, Wildner, Grambole, Zaitsev, Harris, Hofmeister, Milledge, SatitkuneAlpha radiation damage in diamond.Goldschmidt Conference 2008, Abstract p.A672.TechnologyDiamond morphology
DS201312-0637
2013
Grambole, D.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
DS1985-0243
1985
GramenitskiiGramenitskiiReflectance of Diamonds Containing Varying Contents of Lonsdaleite.(russian)Doklady Academy of Sciences Akademy Nauk SSSR, (Russian), Vol. 279, pp. 186-188RussiaRef. Fleischer United States Geological Survey (usgs) Of 88-689.mineralogical Refs. 198
DS200612-0488
2006
Gramling, C.Gramling, C.Ultraslow ridges hold new clues to crust's formation.Science News , Vol. 169, 13, April 1, 8p.Asia, Indian Ocean RidgeTectonics, layer cake
DS200712-0378
2007
Gramling, C.Gramling, C.X-Ray eyes in the sky: scientists are working on satellites that will see far below the planet's surface, better understand structure and compositionGeotimes, Vol. 52, 7, pp. 24-27.MantleCrust, mantle, core
DS202005-0734
2020
Gramling, C.Gramling, C.Plate tectonics may have started 400 million years earlier than we thought. sciencemag.org, April 22, 3p.AustraliaTectonics

Abstract: Modern plate tectonics may have gotten under way as early as 3.2 billion years ago, about 400 million years earlier than scientists thought. That, in turn, suggests that the movement of large pieces of Earth’s crust could have played a role in making the planet more hospitable to life. Geologist Alec Brenner of Harvard University and his colleagues measured the magnetic orientations of iron-bearing minerals in the Honeyeater Basalt, a layer of rock that formed between 3.19 billion and 3.18 billion years ago. The basalt is part of the East Pilbara Craton, an ancient bit of continent in Western Australia that includes rocks as old as 3.5 billion years. This craton, the researchers found, was on the move between 3.35 billion and 3.18 billion years ago, drifting around the planet at a rate of at least 2.5 centimeters per year. That’s a speed comparable to modern plate motions, the team reports April 22 in Science Advances.
DS1996-0560
1996
Grana, J.P.Grana, J.P., Richardson, R.R.Tectonic stress within the New Madrid seismic zoneJournal of Geophysical Research, Vol. 101, No. B3, March 10, pp. 5445-58.MidcontinentTectonics, Geophysics -seismics
DS201502-0053
2010
Granado, P.deVera, J., Granado, P., McClay, K.Structural evolution of the Orange Basin gravity-driven system, offshore Namibia.Marine and Petroleum Geology, Vol. 27, 1, pp. 223-237.Africa, NamibiaStructure
DS1988-0043
1988
Granain, V.K.Barsanov, G.P., Granain, V.K., Kuznetsov, V.P.Diamond in diamond inclusions from kimberlitic pipes of Yakutia. (Russian)Geologii i Geofiziki, (Russian), No. 3, March pp. 132-137RussiaBlank
DS1984-0746
1984
Granata, J.S.Tyson, R., Theisen, A.F., Granata, J.S., Hemphill, W.R.Detection of Visible Luminescence from a Rare Earth Elements (ree) Bearing Carbonatite in Southern California.Geological Society of America (GSA), Vol. 16, No. 4, P. 258. (abstract.)California, West CoastRelated Rocks
DS2002-0608
2002
Grancea, L.Grancea, L., Bailly, L., Leroy, Banks, Marcoux, MilisiFluid evolution in the Baia Mare epithermal gold/polymetallic district, Inner CarpathiansMineralium deposita, RomaniaGold, copper, zinc, Deposit - Baia Mare
DS200912-0042
2009
GrandBegg, G.C., Griffin, W.L., Natapov, O'Reilly, Grand, O'Neill, Hronsky, Poudjom Djomeni, Swain, Deen, BowdenThe lithospheric architecture of Africa: seismic tomography, mantle petrology, and tectonic evolution.Geosphere, Vol. 5, pp. 23-50.AfricaGeophysics - seismic, tectonics
DS1994-1283
1994
Grand, P.Nolet, G., Grand, P., Kennett, B.L.N.Seismic heterogeneity in the upper mantleJournal of Geophysical Research, Vol. 99, No. B 12, Dec. 10, pp. 23, 753-66.MantleGeophysics -seismics
DS200412-2101
2004
Grand, S.West, M., Ni, J., Baldridge, W.S., Wilson, D., Aster, R., Gao, W., Grand, S.Crust and upper mantle shear wave structure of the southwest United States: implications for rifting and support for high elevatJournal of Geophysical Research, Vol. 109, 3, DOI 10.1029/2003 JB002575United States, California, Colorado PlateauGeophysics - seismics, tectonics
DS200512-1185
2005
Grand, S.Wilson, D., Aster, R., Ni, J., Grand, S., West, M., Gao, W.,Baldridge, W.S., Semken, S.Imaging the seismic structure of the crust and upper mantle beneath the Great Plains, Rio Grande Rift, and Colorado Plateau using receiver functions.Journal of Geophysical Research, Vol. 110, B5, 10.1029/2004 JB003492United States, Colorado PlateauGeophysics - seismics
DS200512-1186
2005
Grand, S.Wilson, D., Aster, R., Ni, J., Grand, S., West, M., Gao, W., Baldridge, W.S., Semken, S.Imaging the seismic structure of the crust and upper mantle beneath the Great Plains, Rio Grande Rift and Colorado Plateau using receiver functions.Journal of Geophysical Research, Vol. 110, B5 May 28, B05306 10.1029/2004 JB003492United States, ColoradoGeophysics - seismics
DS1987-0254
1987
Grand, S.P.Grand, S.P.Tomographic inversion for shear velocity beneath the North American plateJournal of Geophysical Research, Vol. 92, pp. 14065-90.Quebec, Ontario, manitoba, AlbertaTomography, Tectonics
DS1990-0495
1990
Grand, S.P.Frohlich, C., Grand, S.P.The fate of subducting slabsNature, Vol. 347, No. 6291, September 27, pp. 333-334GlobalTectonics, Subducting slabs
DS1991-1528
1991
Grand, S.P.Schwartz, S.Y., Lay, T., Grand, S.P.Seismic imaging of subducted slabs: trade offs with deep path and near receiver effectsGeophysical Research Letters, Vol. 18, No. 7, July pp. 1265-1268GlobalMantle, Tectonis, subduction, geophysics, seismics
DS1994-0652
1994
Grand, S.P.Grand, S.P.Mantle shear structure beneath the Americas and surrounding oceansJournal of Geophy. Res, Vol. 99, No. B6, June 10, pp. 11, 591-11, 621MantleGeophysics -seismics, Tectonics, structure
DS1994-0653
1994
Grand, S.P.Grand, S.P.Mantle shear structure beneath the Americas and surrounding oceansJournal of Geophysical Research, Vol. 99, No. B6, June 10, pp. 11, 591-11, 621.United StatesMantle, Core mantle boundary
DS1996-0829
1996
Grand, S.P.Lee, D-K., Grand, S.P.Upper mantle shear structure beneath the Colorado Rocky MountainsJournal of Geophysical Research, Vol. 101, No. B10, Oct. 10, pp. 22, 233-44.Colorado, WyomingTectonics, Structure
DS1997-0437
1997
Grand, S.P.Grand, S.P., Van der Hilst, R.D., Widiyantoro, S.Global seismic tomography: a snapshot of convection in the earthGsa Today, Vol. 7, No. 4, April pp. 1-7.GlobalTomography, Geophysics - seismics
DS2002-0609
2002
Grand, S.P.Grand, S.P.Mantle shear wave tomography and the fate of subducted slabsPhilosophical Transactions, Royal Society of London Series A Mathematical, Vol.1800, pp. 2475-92.MantleSubduction
DS2002-1489
2002
Grand, S.P.Simmons, N.A., Grand, S.P.Partial melting in the deepest mantleGeophysical Research Letters, Vol. 29, 10, DOI 10.1029/2001GL013716MantleMelting
DS200412-0607
2004
Grand, S.P.Gao, W., Grand, S.P., Baldridge, W.S., Wilson, D., West, M., Ni, J.F., Aster, R.Upper mantle convection beneath the central Rio Grande rift imaged by P and S wave tomography.Journal of Geophysical Research, Vol. 109, 3, DOI 10.1029/2003 JB002743United States, New Mexico, Colorado PlateauGeophysics - seismics, tectonics
DS200412-1988
2004
Grand, S.P.Thorne, M.S., Garnero, E.J., Grand, S.P.Geographic correlation between hot spots and deep mantle lateral shear wave velocity gradients.Physics of the Earth and Planetary Interiors, Vol. 146, 1-2, pp. 47-63.MantleGeophysics - seismics, plumes
DS200612-1307
2006
Grand, S.P.Simmons, N.A., Forte, A.M., Grand, S.P.Constraining mantle flow with seismic and geodynamic data: a joint approach.Earth and Planetary Science Letters, Vol. 246, 1-2, June 15, pp. 109-124.MantleGeophysics - seismics
DS200812-0770
2008
Grand, S.P.Moucha, R., Forte, A.M., Mitrovica, J.X., Rowley, D.B., Quere, S., Simmons, Grand, S.P.Dynamic topography and long term sea level variations: there is no such thing as a stable continental platform.Earth and Planetary Science Letters, Vol. 271, 1-4, pp. 101-108.MantleGeomorphology
DS200812-0771
2008
Grand, S.P.Moucha, R., Forte, A.M., Mitrovica, J.X., Rowley, D.B., Quere, S., Simmons, N.A., Grand, S.P.Dynamic topography and long term sea level variations: there is no such thing as a stable continental platform.Earth and Planetary Science Letters, Vol. 271, 1-4, pp. 101-108.MantleCraton
DS200812-0772
2008
Grand, S.P.Moucha, R., Forte, A.M., Rowley, D.B., Mitrovica, J.X., Simmons, N.A., Grand, S.P.Mantle convection and the recent evolution of the Colorado Plateau and the Rio Grande Rift valley.Geology, Vol. 36, 6, pp. 439-442.United States, Colorado PlateauConvection
DS200812-1072
2008
Grand, S.P.Sine, C.R., Wilson, D., Gao, W., Grand, S.P., Aster, R., Ni, J., Baldridge, W.S.Mantle structure beneath the western edge of the Colorado Plateau.Geophysical Research Letters, Vol. 35, 10, May 28, L10303.United States, Colorado PlateauTectonics
DS200812-1240
2008
Grand, S.P.Wang, X., Ni, J.F., Aster, R., Sandovi, E., Wilson, D., Sine, C., Grand, S.P., Baldridge, W.S.Shear wave splitting and mantle flow beneath the Colorado Plateau and its boundary with the Great Basin.Bulletin of Seismological Society of America, Vol. 98, 5, pp. 2526-2532.United States, Colorado PlateauGeophysics - seismics
DS201012-0206
2010
Grand, S.P.Forte, A.M., Moucha, R., Simmons, N.A., Grand, S.P., Mitrovica, J.X.Deep mantle contributions to the surface dynamics of the North American continent.Tectonophysics, Vol.481, 1-4, pp. 3-15.Canada, United StatesTectonics
DS201012-0207
2010
Grand, S.P.Forte, A.M., Quere, S., Moucha, R., Simmons, N.A., Grand, S.P., Mitrovica, J.X., Rowley, D.B.Joint seismic geodynamic mineral physical modeling of African geodynamics: a reconciliation of deep mantle convection with surface geophysical constraints.Earth and Planetary Science Letters, Vol. 295, 3-4, pp. 329-341.AfricaGeophysics - seismics
DS201012-0812
2010
Grand, S.P.Van Wijk, J.W., Baldridge, W.S., Van Hunen, J., Goes, S., Aster, R., Coblentz, D.D., Grand, S.P., Ni, J.Small scale convection at the edge of the Colorado Plateau: implications for topography, magmatism, and evolution of Proterozoic lithosphere.Geology, Vol. 38, 7, pp. 611-614.United States, Colorado PlateauMagmatism
DS201212-0086
2011
Grand, S.P.Brandt, M.B., Grand, S.P., Nyblade, A.A., Dirks, P.H.G.Upper mantle seismic structure beneath southern Africa: constraints on the bouyancy supporting the African Superswell.Pure and Applied Geophysics, Vol. 169, 4, pp. 595-614.Africa, South AfricaMantle - geophysics
DS1860-0084
1869
GrandidierGrandidierVoyage dans les Provinces Meridonales de L'indeTour Du Monde., IndiaTravelogue
DS1992-1419
1992
Grandstaff, D.Sirkis, D., Grandstaff, D., Castro, J., Gold, D.Testing a model of diatreme emplacement at Oka, Quebec, using rockmagnetismEos Transactions, Vol. 73, No. 14, April 7, supplement abstracts p. 102QuebecCarbonatite, Oka
DS1998-1496
1998
Grandstaff, D.Ulmer, G.C., Grandstaff, D., Gobbels, M., Woermann, E.An experimental delineation of the oxygen fugacity of moissanite ( SiC)bearing silicate systems.7th International Kimberlite Conference Abstract, pp. 932-33.GlobalMineral chemistry, Moissanite
DS1998-1588
1998
Grandstaff, D.Woermann, E., Gobbels, M., Ulmer, G.C., Grandstaff, D.Moissanite and its bearing on the oxygen fugacity of the deeper regimes Of the Earth's upper mantle.7th International Kimberlite Conference Abstract, pp. 958-9.MantleMoissanite, Peridotite xenoliths
DS1987-0758
1987
Grandstaff, D.E.Ulmer, G.C., Grandstaff, D.E., Weiss, D., Moats, M.A., et al.The mantle redox state: an unfinished story?Mantle metasomatism and alkaline magmatism, edited E. Mullen Morris and, No. 215, pp. 5-24GlobalModel, IOF.
DS1992-0599
1992
Grandstaff, D.E.Grandstaff, D.E., Ulmer, G.C.Fluid inclusions in diamond, equations of state and mantle redoxconditionsEos Transactions, Vol. 73, No. 14, April 7, supplement abstracts p.335MantleDiamond morphology, Mantle redox
DS1999-0755
1999
Grandstaff, D.E.Ulmer, G.C., Grandstaff, D.E.Redox stability of moissanite (SIC) and diamond fluid inclusions:implications for the mantle.Geological Association of Canada (GAC) Geological Association of Canada (GAC)/Mineralogical Association of Canada (MAC)., Vol. 24, p. 132. abstractMantleMoissanite
DS2002-0109
2002
Granet, M.Barruol, G., Granet, M.A Tertiary asthenospheric flow beneath the southern French Massif Central indicated by upper mantle seismic anisotropy and related to west mediterranean extension.Earth and Planetary Science Letters, Vol. 202, 1, pp.31-47.EuropeGeophysics - seismics
DS201909-2029
2019
Granet, M.Chandra, J., Paul, D., Stracke, A., Chabaux, F., Granet, M.The origin of carbonatites from Amba Dongar within the Deccan Large Igneous Province.Journal of Petrology , Vol. 60, 6, pp. 1119--1134.Indiacarbonatite

Abstract: There are disparate views about the origin of global rift- or plume-related carbonatites. The Amba Dongar carbonatite complex, Gujarat, India, which intruded into the basalts of the Deccan Large Igneous Province (LIP), is a typical example. On the basis of new comprehensive major and trace element and Sr-Nd-Pb isotope data, we propose that low-degree primary carbonated melts from off-center of the Deccan-Réunion mantle plume migrate upwards and metasomatize part of the subcontinental lithospheric mantle (SCLM). Low-degree partial melting (~2%) of this metasomatized SCLM source generates a parental carbonated silicate magma, which becomes contaminated with the local Archean basement during its ascent. Calcite globules in a nephelinite from Amba Dongar provide evidence that the carbonatites originated by liquid immiscibility from a parental carbonated silicate magma. Liquid immiscibility at crustal depths produces two chemically distinct, but isotopically similar magmas: the carbonatites (20% by volume) and nephelinites (80% by volume). Owing to their low heat capacity, the carbonatite melts solidified as thin carbonate veins at crustal depths. Secondary melting of these carbonate-rich veins during subsequent rifting generated the carbonatites and ferrocarbonatites now exposed at Amba Dongar. Carbonatites, if formed by liquid immiscibility from carbonated silicate magmas, can inherit a wide range of isotopic signatures that result from crustal contamination of their parental carbonated silicate magmas. In rift or plume-related settings, they can, therefore, display a much larger range of isotope signatures than their original asthenosphere or mantle plume source.
DS200712-0800
2007
Granick, S.Par, G-S., Bae, S.C., Granick, S., Lee, J-H., Bae, S-D, Kim, T., Zuo, J.M.Naturally formed epitaxial diamond crystals in rubies.Diamond and Related Materials, Vol. 16, 2, Feb., pp. 397-400.TechnologyDiamond crystallography, rubies
DS200712-0801
2007
Granick, S.Park, G.S., Bae, S.C., Granick, S., Lee, J.H., Bae, S.D., Kim, T., Zuo, J.M.Naturally formed epitaxial diamond crystals in rubies.Diamond and Related Materials, Vol. 16, 2, pp. 397-400 Ingenta 1070685098TechnologyDiamond morphology
DS200712-0261
2007
GraninDobtresov, V.Y., Psakhe, S.G., Popov, V.L., Shilko, E.V., Granin, Timofeev,Astafurov, Dimaki, StarchevichIce cover of Lake Baikal as a model for studying tectonic processes in the Earth's crust.Doklady Earth Sciences, Vol. 413, 2, pp. 155-159.RussiaGeomorphology
DS1992-0600
1992
Grannik, V.M.Grannik, V.M.Magmatic evolution during rifting and some practical consequencesDoklady Academy of Science USSR, Earth Science Section, Vol. 312, No. 1-3, June pp. 247-249RussiaTectonics -rifting, Magma
DS1995-1161
1995
GranovskyMarakushev, A.A., Mitreikina, O.B., Zinolieva, GranovskyDiamondiferous meteorites and their genesisPetrology, Vol. 3, No. 5, Sept-Oct. pp. 407-423.RussiaMeteorites
DS1990-0289
1990
Granozzi, G.Casarin, M., Granozzi, G., Tondello, E., Vittadin, A.A molecular cluster approach to the electronic structure of anomalous muonium in diamondChem. Phys, Vol. 148, No. 2-3, December 1, pp. 183-192GlobalDiamond morphology, MuoniuM.
DS1990-1301
1990
Grant, A.C.Sanford, B.V., Grant, A.C.New findings relating to the stratigraphy and structure of the HudsonPlatformGeological Survey of Canada Paper, Interior Plains and Arctic Canada, No. 90-1D pp. 17-30Ontario, ManitobaStructure, Hudson Platform
DS1998-1282
1998
Grant, A.C.Sanford, B.V., Card, K.D., Grant, A.C., Okulitch, A.V.Bedrock geology, James Bay Ontario - District of Keewatin, NorthwestTerritories.Geological Survey of Canada Open file, No. 3558, 1:1, 000, 000 $ 26.00Ontario, Northwest TerritoriesMap - bedrock geology, James Bay Lowlands
DS1999-0624
1999
Grant, A.C.Sanford, B.V., Grant, A.C.Paleozoic and Mesozoic geology of the Hudson and southeast Arcticplatforms.Geological Survey Open File, No. 3595, 1: 2, 500, 000 $ 40.00Northwest Territories, Ontario, ManitobaMap
DS1992-0728
1992
Grant, B.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
DS1994-0654
1994
Grant, B.Grant, B.Diamond origin and transport: kimberlites and lamproitesThe Gangue (MDD Newsletter), No. 46, Sept. pp. 12-14.GlobalDiamond genesis, Overview -brief but concise
DS2001-0404
2001
Grant, B.Grant, B.The art and science of writing geoscience reports. RevisionProspectors and Developers Association of Canada (PDAC), Geological Association of Canada (GAC), Geological Society of Canada (GSC), distributors, GlobalBook - ad, Report writing - revision
DS200512-0668
2005
Grant, B.MacKenzie, J.M., Canil, D., Johnston, S.T., English, J., Mihalynuk, M.G., Grant, B.First evidence for ultrahigh pressure garnet peridotite in the North American Cordillera.Geology, Vol. 33, 2, pp. 105-108.Canada, Yukon, British ColumbiaUHP, Mantle lithosphere
DS200612-0218
2005
Grant, B.Canil, D., Mihalynuk, M., MacKenzie, J.M., Johnston, S.T., Grant, B.Diamond in the Atlin-Nakin a region, British Columbia: insights from heavy minerals in stream sediments.Canadian Journal of Earth Sciences, Vol. 42, 12, Dec. pp. 2161-2171.Canada, British Columbia, Yukon, United States, AlaskaGeochemistry
DS1975-0088
1975
Grant, B.G.Grant, B.G.Exploration of Diamonds Phase IiLesotho Department of Mines And Geology, PROJECT No. LES73/021 SPECIAL REPORT BG/1. AND MAP SHEET 292LesothoBlank
DS1975-0285
1976
Grant, B.G.Grant, B.G.Exploration for Diamonds Phase IiLesotho Department of Mines And Geology, PROJECT LES73/021, SPECIAL REPORT BG/2. FIELD GEOLOGISTS REPLesothoBlank
DS1991-0597
1991
Grant, D.R.Graham, D.F., Grant, D.R.A test of airborne, side looking synthetic -aperture radar in central Newfoundland for geological reconnaissanceCanadian Journal of Earth Sciences, Vol. 28, No. 2, February pp. 257-265NewfoundlandRemote sensing, Overview
DS200412-0709
2004
Grant, I.F.Grant, I.F., Heyraud, C., Breon, F-M.Continentral scale hotspot observations of Australia at sub-degree anular resolution from POLDER.International Journal of Remote Sensing, Vol. 25, 18, Sept. pp. 3625-36.AustraliaGeophysics - remote sensing
DS1994-1825
1994
Grant, J.Van der Hilst, R., Kennettm B., Christie, D., Grant, J.Project Skippy explores the lithosphere and mantle beneath AustraliaEos, Vol. 75, No. 15, April 12, pp. 177, 180, 181AustraliaMantle, Geophysics -seismics
DS200512-0362
2005
Grant, J.Grant, J.Diamonds, foreign aid and the uncertain prospects for post-conflict reconstruction in Sierra Leone.The Round Table, Vol. 94, No. 381, pp. 443-457.Africa, Sierra LeoneHistory
DS200612-0489
2005
Grant, J.Grant, J.Diamonds, foreign aid and the uncertain prospects for post conflict reconstruction in Sierra Leone.The Round Table, Vol. 94, Sept. no. 981, pp. 443-457.Africa, Sierra LeoneConflict diamonds
DS1990-0595
1990
Grant, J.A.Grant, J.A., Frost, B.R.Contact metamorphism and partial melting of pelitic rocks in the Aureole of the Laramie anorthosite complex Morton Pass WyomingAmerican Journal of Science, Vol. 290, No. 4, April pp. 425-WyomingAnorthosite, Geochemistry
DS1991-1260
1991
Grant, J.A.Olsen, S.N., Grant, J.A.Isocon analysis of migmatization in the Front Range, Colorado, USAJournal of Metamorphic Geology, Vol. 9, No. 2, March pp. 151-164ColoradoMignatization, Geochronology
DS1993-0567
1993
Grant, J.A.Grant, J.A.SurView - a microsoft window 3.1 application to view geophysical surveydat a ( line, grid, contour, and stacked profilesGeological Survey of Canada, Open file, No. 2661, 1 discGlobalGeophysics, Computer -program SurView
DS1995-1170
1995
Grant, J.A.Markarian, D., Grant, J.A., Elliott, B.E.LogView - microsoft windows borehole log ProgramGeological Survey of Canada, Open File 3055 $ 100.00GlobalComputer, Program -LogView
DS2001-0405
2001
Grant, J.A.Grant, J.A.SurView - a GIS application Windows - viewing geophys. survey dat a (line, grid, contout and stacked profilesGeological Survey of Canada (GSC) Open File, D2661, 1 CD, $ 100.GlobalComputer, Program - SurView
DS200412-0710
2004
Grant, J.A.Grant, J.A., Taylor, I.Global governance and conflict diamonds: the Kimberley Process and the Quest for clean gems.Round Table, ( CARFAX Publ.) Ingenta 1043486217, No. 375, pp. 385-402.GlobalLegal - Kimberley Process
DS200612-0490
2006
Grant, J.A.Grant, J.A.Isocon analysis: a brief review of the method and applications.Physics and Chemistry of the Earth Parts A,B,C, Vol. 30, 17-18, pp. 997-1004.TechnologyMetasomatism, geochemistry
DS201312-0330
2013
Grant, J.Andrew.Grant, J.Andrew.Commonwealth cousins combating conflict diamonds: an examination of South African and Canadian contributions to the Kimberley Process.Commonwealth and Comparative Politics ( Routledge Pub)., Vol. 51, 2, pp. 1466-2043. IngentaCanada, Africa, South AfricaKimberley Process
DS1993-0701
1993
Grant, J.W.Hrabi, R.B., Grant, J.W., Godin, P.D., Helmstaedt, H., King, J.E.Geology of the Winter Lake supracrustal belt, central Slave Province, District of Mackenzie, N.W.T.Geological Survey Canada Paper, No. 93-1C, pp. 71-82Northwest TerritoriesWinter Lake, Regional geology
DS1994-0787
1994
Grant, J.W.Hrabi, R.B., Grant, J.W., Berclaz, A., Duquette, D., Villeneuve, M.E.Geology of the northern half of the Winter Lake supracrustal belt, SlaveProvince, Northwest Territories.Geological Survey of Canada Current Research, No. 1994, C, pp. 13-22.Northwest TerritoriesGeology, Winter Lake
DS200712-0379
2007
Grant, K.Grant, K., Ingrin, J., Lorand, J.P., Dumas, P.Water partitioning between mantle minerals from peridotite xenoliths.Contributions to Mineralogy and Petrology, Vol. 154, 1, pp. 15-34.MantleMineralogy - hydrous phase
DS200612-0491
2006
Grant, K.J.Grant, K.J., Kohn, S.C., Brooker, R.A.Solubility and partitioning of water in synthetic forsterite and enstatite in the system MgO SiO2 and H2Al2O3.Contributions to Mineralogy and Petrology, Vol. 151, 6, pp. 651-664.TechnologyPetrology
DS200612-0619
2006
Grant, K.J.Ingrin, J., Grant, K.J.H profiles in mantle xenoliths: constraints from diffusion data.Geochimica et Cosmochimica Acta, Vol. 70, 18, p. 1. abstract only.MantleGeochemistry
DS200712-0380
2007
Grant, K.J.Grant, K.J., Brooker, R.A., Kohn, S.C., Wood, B.J.The effect of oxygen fugacity on hydroxyl concentrations and speciation in olivine: implications for water solubility in the upper mantle.Earth and Planetary Science Letters, Vol. 261, 1-2, pp. 217-229.MantleWater
DS200912-0008
2009
Grant, K.J.Araujo, D.P., Griffin, W.L., O'Reilly, S.Y., Grant, K.J., Ireland, T., Van Achterbergh, E.Micro inclusions in monocrystalline octahedral diamonds and coated diamonds from Diavik, Slave Craton: clues to diamond genesis.Lithos, In press available 38p.Canada, Northwest TerritoriesDeposit - Diavik
DS201212-0310
2012
Grant, K.J.Howell, D., O'Neill, C.J., Grant, K.J., Griffin, W.L., O'Reilly, S.Y., Pearson, N.J., Stern, R.A., Stachel, T.Platelet development in cuboid diamonds: insights from micro-FTIR mapping.Contributions to Mineralogy and Petrology, Vol. 164, 6, pp. 1011-1025.TechnologyDiamond morphology
DS1997-0764
1997
Grant, N.Menzel-Jones, A., Ferguson, I.J., Grant, N., Roberts, B.Deep Slave: probing the deep lithosphere beneath the Slave Craton and adjacent terranes using electromagnetic imaging.Geological Survey of Canada Forum 1997 abstracts, p. 4. AbstractNorthwest TerritoriesCraton, Geophysics - electromagnetic
DS1989-1223
1989
Grant, S.Piper, J.D.A., Grant, S.A paleomagnetic test of the axial dipole assumption and complications for continental distribution through geological timePhysics of the Earth and Planetary Interiors, Vol. 55, pp. 37-53. Database # 18199GlobalGeophysics-paleomagnetics, Pangaea
DS201312-0331
2013
Grant, T.Grant, T., Milke, R., Wunder, B., Morales, L., Wirth, R.The kinetic effects of H20 in metasomatic and xenolith breakdown reactions.Goldschmidt 2013, AbstractMantleFluids
DS2001-0726
2001
GranthamManhica, A.S.T.D., Grantham, Armstrong, Guise, KrugerPolyphase deformation and metamorphism at the Kalahari Craton - Mozambique Belt boundary.Geological Society of London, Special Publication, Special Paper 184, pp. 303-22.South Africa, MozambiqueMetamorphism, Craton
DS1960-0051
1960
Grantham, D.R.Grantham, D.R., Allen, J.B.Kimberlites in Sierra LeoneOverseas Geol. Min. Res., Vol. 8, PP. 5-25.Sierra Leone, West Africa, KoiduGeology
DS1960-0052
1960
Grantham, D.R.Grantham, D.R., Allen, J.B.Kimberlite in Sierra LeoneGeological Survey SIERRA LEONE SHORT PAPER., No. 6West Africa, Sierra LeoneGeology, Petrography
DS1960-0831
1967
Grantham, D.R.Grantham, D.R.The Diamond Host Rocks of GhanaAfr. Geol. Symposium 4th., Held In Sheffield., 2P. abstract.Ghana, West AfricaHistory, Geology
DS1960-1113
1969
Grantham, D.R.Grantham, D.R.The Age of the Diamond Bearing Rocks of PannaCurrent Science., Vol. 38, No. 16, PP. 377-379.IndiaGeochronology
DS201901-0037
2018
Grantham, G.Grantham, G., Eglinton, B., Macey, P.H., Ingram,B., Radeneyer, M., Kaiden, H., Manhica, V.The chemistry of Karoo age andesitic lavas along the northern Mozambique coast, southern Africa and possible implications for Gondwana breakup.South African Journal of Geology, Vol. 121, pp. 271-286.Africa, Mozambiquegeodynamics

Abstract: Major, trace, radiogenic isotope and stable isotope data from lavas along the northeastern coast of Mozambique are described. The whole rock composition data demonstrate that the rocks are dominantly andesitic with compositions typical of calc-alkaline volcanic rocks from arc environments. SHRIMP U/Pb data from zircons indicate that the zircons are xenocrystic, having ages of between 500 Ma and 660 Ma, with the age of the lava constrained by Rb/Sr data at ~184 Ma. Strontium, Nd and Pb radiogenic isotope data support an interpretation of extensive mixing between a Karoo age basaltic magma (dolerite) from Antarctica and continental crust similar in composition to the Mozambique basement. Oxygen isotope data also imply a significant crustal contribution to the lavas. Possible tectonic settings for the lavas are at the margin of a plume or from a locally restricted compressional setting during Gondwana breakup processes.
DS1998-0933
1998
Grantham, G.H.Manhica, A., Grantham, G.H., Guise, P.D.An 40Ar 39Ar study of Zimbabwe Craton Mozambique Belt boundary inManica-Chimoio area, western Mozambique.Journal of African Earth Sciences, Vol. 27, 1A, p. 135. AbstractGlobalGeochronology
DS200412-0711
2003
Grantham, G.H.Grantham, G.H., Maboko, M., Eglington, B.M.A review of the evolution of the Mozambique belt and implications for the amalgamation and dispersal of Rodinia and Gondwana.Proterozoic East Gondwana: Supercontinent assembly and Breakup. Ed. Yoshida , Geological Society of London Spe, No. 206, pp. 401-426.Gondwana, RodiniaPlume, tectonics
DS201012-0248
2010
Grantham, G.H.Grantham, G.H., Manhica, A.D.S.T., Armstrong, R.A., Kruger, F.J., Loubser, M.New SHRIMP, Rb/Sr and Sm/Nd isotope and whole rock chemical dat a from central Mozambique and western Dronning Maud Land: implications for eastern KalahariJournal of African Earth Sciences, Vol. 59, 1, pp.74-100.Africa, Mozambique, AntarcticaCraton, amalgamation of Gondwana
DS1960-0456
1964
Granthan, D.R.Granthan, D.R.The Diamond Deposits of Panna, Central IndiaIndustrial Diamond Review., Vol. 24, No. 279, FEBRUARY PP. 28-35.IndiaBlank
DS2003-0246
2003
Grapes, R.Chen, G., Grapes, R., Zhang, K.A model for Mesozoic crustal melting and tectonic deformation in southeast ChinaInternational Geology Review, Vol. 45, 10, Oct. pp. 948-957.ChinaBlank
DS200412-0317
2003
Grapes, R.Chen, G., Grapes, R., Zhang, K.A model for Mesozoic crustal melting and tectonic deformation in southeast China.International Geology Review, Vol. 45, 10, Oct. pp. 948-957.ChinaTectonics
DS1991-0500
1991
Graphchikov, A.A.Fonarev, V.I., Graphchikov, A.A., Konilov, A.N.A consistent system of geothermometers for metamorphic complexesInternational Geology Review, Vol. 33, No. 8, August pp. 743-783RussiaGeothermometry, Metamorphic complexes
DS200712-0381
2007
Graps, A.L.Graps, A.L., Morbidelli, A.A chondritic and nonchondritic Earth: what would the dynamicists say?Plates, Plumes, and Paradigms, 1p. abstract p. A352.MantleWater
DS2000-0357
2000
Grasby, S.Grasby, S., Osadetz, K., Betcher, R., Render, F.Reversal of the regional scale flow system of the Williston Basin in response to Pleistocene glaciationGeology, Vol. 28, No. 7, July, pp. 635-8.Alberta, Saskatchewan, Manitoba, MontanaGeomorphology, glaciation
DS200612-0375
2005
Graser, G.Emmel, B., Jacobs, J., Kastowski, M., Graser, G.Phanerozoic upper crustal tectonothermal development of basement rocks from central Madagascar: an integrated fission track and structural study.Tectonophysics, in pressAfrica, MadagascarGeothermometry, Gondwana
DS201212-0151
2012
Graser, P.De Bruin, D., Graser, P.Quality control procedures applied to routine electron probe analyses of kimberlite indicator minerals.10th. International Kimberlite Conference Held Bangalore India Feb. 6-11, Poster abstractTechnologyGeochemistry - KIMS
DS1994-0655
1994
Grasset, O.Grasset, O., Albarede, F.Hybridization of mingling magmas with different densitiesEarth and Planetary Science Letters, Vol. 121, No. 3-4, February pp. 327-332GlobalMagma generation
DS2002-0414
2002
Grasset, O.Eberle, M.A., Grasset, O., Sotin, C.A numerical study of the interaction between the mantle wedge, subducting slab and overriding plate.Physics of the Earth and Planetary Interiors, Vol. 134, 3-4, Dec. 22, pp. 191-202.MantleSubduction, Tomography
DS200912-0264
2009
Grassi, D.Grassi, D., Schmidt, M.W.Melting of carbonated pelites at 9-13 GPa: generating potassic carbonatitic melts for mantle metasomatism.Goldschmidt Conference 2009, p. A461 Abstract.MantleMetasomatism
DS201012-0249
2010
Grassi, D.Grassi, D., Schmidt, M.W.Melting of carbonated pelites at 8-13 GPa: generating K-rich carbonatites for mantle metasomatism.Contributions to Mineralogy and Petrology, In press available, 23p.MantleSubduction, potassic magmatism
DS201112-0384
2011
Grassi, D.Grassi, D., Schmidt, M.W.Melting of carbonates pelites at 8-13 GPa: generating K rich carbonatites for mantle metasomatism.Contributions to Mineralogy and Petrology, Vol. 162, 1p. pp. 169-191.TechnologyMetasomatism
DS201112-0385
2011
Grassi, D.Grassi, D., Schmidt, M.W.Melting of carbonated pelites from 70 to 700 km depth.Journal of Petrology, Vol. 52, 4, pp. 765-789.MantleMelting - not specific to diamonds
DS201904-0738
2019
Grassi, D.Galli, A., Grassi, D., Sartori, G., Gianola, O., Burg, J-P., Schmidt, M.W.Jurassic carbonatite and alkaline magmatism in the Ivrea zone ( European Alps) related to the breakup of Pangea.Geology, Vol. 47, 3, pp. 199-202..Europecarbonatite

Abstract: We report on pipe-like bodies and dikes of carbonate rocks related to sodic alkaline intrusions and amphibole mantle peridotites in the Ivrea zone (European Southern Alps). The carbonate rocks have bulk trace-element concentrations typical of low-rare earth element carbonatites interpreted as cumulates of carbonatite melts. Faintly zoned zircons from these carbonate rocks contain calcite inclusions and have trace-element compositions akin to those of carbonatite zircons. Laser ablation-inductively coupled plasma-mass spectrometry U-Pb zircon dating yields concordant ages of 187 ± 2.4 and 192 ± 2.5 Ma, coeval with sodic alkaline magmatism in the Ivrea zone. Cross-cutting relations, ages, as well as bulk and zircon geochemistry indicate that the carbonate rocks are carbonatites, the first ones reported from the Alps. Carbonatites and alkaline intrusions are comagmatic and were emplaced in the nascent passive margin of Adria during the Early Jurassic breakup of Pangea. Extension caused partial melting of amphibole-rich mantle domains, yielding sodic alkaline magmas whose fractionation led to carbonatite-silicate melt immiscibility. Similar occurrences in other rifts suggest that small-scale, sodic and CO2-rich alkaline magmatism is a typical result of extension and decompression-driven reactivation of amphibole-bearing lithospheric mantle during passive continental breakup and the evolution of magma-poor rifts.
DS200712-0824
2006
Grassineau, N.Peate, D.W., Breddam, K., Baker, J.A., Kurz, M., Grassineau, N., Barker, A.K.Compositional features of enriched Icelandic mantle components.Geochimica et Cosmochimica Acta, In press availableEurope, IcelandGeochemistry
DS200912-0848
2009
Grassineau, N.Zaitsev, A.N., Keller, J., Jones, G., Grassineau, N.Mineralogical and geochemical changes of natrocarbonatites due to fumarolic activity at Oldoinyo Lengai volcano, Tanzania.alkaline09.narod.ru ENGLISH, May 10, 2p. abstractAfrica, TanzaniaCarbonatite
DS201603-0380
2010
Grasso, C. B.Grasso, C. B.Petrology of alkaline complex Serra Negra. ( Salitre 1 e Salitre II) Whole rock geochemistry Thesis, Universidade de Brasilia *** IN POR, 164p. Pdf *** In PortugeseSouth America, BrazilCarbonatite
DS201312-0319
2013
Grasso, C.B.Gomide, C.S., Brod, J.A., Junqueira-Brod, T.C., Buhn, B.M., Santos, R.V., Barbosa, E.S.R., Cordeiro, P.F.O., Palmieri, M., Grasso, C.B., Torres, M.G.Sufur isotopes from Brazilian alkaline carbonatite complexes.Chemical Geology, Vol. 341, pp. 38-49.South America, BrazilDeposit - Tapira, Salitre, Serra Negra, Catalao, Jacupiringa
DS201012-0796
2010
Grasso, J.R.Traversa, F., Pinel, V., Grasso, J.R.A constant influx model for the dike propogation: implications for magma reservoir dynamics.Journal of Geophysical Research, Vol. 115, B1, B01201.MantleMagmatism
DS1975-1036
1979
Grasso, R.Grasso, R.El 452 Kia-ora Area, South Australia, Report on the Drilling of Circular Depressions for Oilmin Nl, Transoil Nl and Petromin Nl.South Australia Open File., No. E3466, 3P. UNPUBL.Australia, South AustraliaRotary Drilling, Prospecting, Geology, Diamonds, Kimberlite
DS1991-0599
1991
Grasty, R.L.Grasty, R.L., Holman, P.B., Blanchard, Y.B.Transportable calibration pads for ground and airborne gamma rayspectrometersGeological Survey of Canada Paper, No. 90-23, 25pCanadaSpectrometry, Program -PADWIN.
DS1900-0190
1903
Gratacap, L.P.Gratacap, L.P.A Possible Kimberley DiamondMineral. Coll., Vol. 10, JUNE PP. 60-61.United States, Kentucky, AppalachiaDiamond Occurrence
DS1991-0617
1991
Gratham, G.H.Groenewald, P.B., Gratham, G.H., Watkeys, M.K.Geological evidence for a Proterozoic to Mesozoic link between southeastern Africa and Dronning Maud Land, AntarcticaJournal of the Geological Society of London, Vol. 148, pp. 1115-1123Africa, AntarcticaCraton, Lithostratigraphy
DS1991-0600
1991
Grathwohl, O. and M.Grathwohl, O. and M.Antwerp diamond seminarCab and Crystal, Vol. 3, No. 6, December pp. 14-16BelgiumNews item, Brief overview
DS1991-0601
1991
Gratier, J.P.Gratier, J.P., Gamond, J.F.Transition between seismic and aseismic deformation in the upper crustDeformation Mechanisms, Rheology and Tectonics, editors Knipe, R.J., No. 54, pp. 461-473GlobalTectonics, Geophysics -seismics
DS1900-0407
1906
Graton, L.C.Graton, L.C.Reconnaissance of Some Gold and Tin Deposits of the Southern Appalachians. with Notes on the Dahlonega Mines by W. Lindgren.United States Geological Survey (USGS) Bulletin., No. 293, 134P.United States, AppalachiaDiamond Occurrence
DS201412-0832
2014
Grattan, K.Simandl, G.J., Paradis, S., Stone, R.S., Fajber, R., Kressall, R.D., Grattan, K., Crozier, J., Simandl, L.J.Applicablity of handheld X-ray fluroescence spectrometry in the exploration and development of carbonatite related niobium deposits: a case study of the Aley carbonatite, British Columbia, Canada.Geochemistry: Exploration, Environment, Analysis, Vol. 14, 3, pp. 211-221.Canada, British ColumbiaCarbonatite
DS1960-0673
1966
Grattan-Bellew, P.E.Grattan-Bellew, P.E.The Composition of Some Garnets from African KimberlitesKimberlite-carbonatite Conference Held New Delhi, (1964), I.M.A. Mineralogical Society of India VOLUME, PP. 23-28.South AfricaCrystallography, Mineralogy
DS1989-0533
1989
Gratton, J.Gratton, J.Crustal shortening, root spreading, isotasy and the growth of orogenicbelts: a dimensional analysisJournal of Geophysic. Research, Vol. 94, No. B 11, November 10, pp. 15, 627-15, 635GlobalOrogenic belts, Tectonics
DS200412-0767
2004
Gratton, M.N.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
DS1960-1097
1969
Gratton-Bellew, P.Edwards, N., Gratton-Bellew, P.Report on the Coral Rapids Investigation for Selection Trust Exploration Limited, Section Diamonds.Ontario Department of Mines, ASSESSMENT WORK FILE., No. 2.133, 15P. DECEMBER.Canada, OntarioGeochemistry, Sampling, Prospecting
DS1990-0204
1990
Gratz, A.J.Bird, P., Gratz, A.J.A theory for buckling the mantle lithosphere and Moho during compressive detachments in continentsTectonophysics, Vol. 177, pp. 325-336GlobalMantle, Tectonics
DS2002-0131
2002
Gratzer, R.Bechtel, A., Gratzer, R., Puttmann, W.,Oszczepalski, S.Geochemical characteristics across the oxic/anoxic interface Rote Faule front within the KuperschieferChemical Geology, Vol.185,1-2,pp.9-31.PolandGeochemistry, Deposit - Lubin Sieroszowice mining district
DS1992-0601
1992
Graubard, C.M.Graubard, C.M., Smith, G.M.The influence of Precambrian structure on Late Proterozoic Rift geometry of the western USAGeological Society of America (GSA) Abstracts with programs, 1992 Annual, Vol. 24, No. 7, abstract p. A365CordilleraTectonics
DS1992-0602
1992
Graubard, C.M.Graubard, C.M., Smith, G.M.The influence of Precambrian structure on tectonics of the western USAGeological Society of America (GSA) Abstract Volume, Vol. 24, No. 5, May p.28. abstract onlyWyomingTectonics, Structure
DS1999-0356
1999
GrauchKeller, G.R., Miller, Snelson, Sheehan, Levander, GrauchCrustal structure of the Rocky Mountain region, review and recent resultsGeological Society of America (GSA), Vol. 31, No. 7, p. 186. abstract.Alberta, WyomingTectonics
DS2002-1192
2002
Grauch, R.I.Orris, G.J., Grauch, R.I.Rare earth element mines, deposits and occurrencesU.s.g.s. Open File, Http://geopubs.wr.usgs.gov/open-file/of2-189, GlobalCarbonatite ( part of deposit database)
DS200412-1482
2002
Grauch, R.I.Orris, G.J., Grauch, R.I.Rare earth element mines, deposits and occurrences.U.S. Geological Survey, GlobalCarbonatite, ( part of deposit database)
DS1990-0103
1990
Grauch, V.J.Abrams, G.A., Grauch, V.J., Bankey, V.Complete bouguer gravity anomaly map of the Uinta and Piceance basins andvicinity, Utah and ColoradoUnited States Geological Survey (USGS) Open File, No. MF-2008-D, 1 : 500, 000Utah, Colorado PlateauGeophysics -gravity, Map
DS1993-0568
1993
Grauch, V.J.Grauch, V.J., et al.Materials provided at the workshop Geophysical map interpretation on thePC, April 21-22, 1993United States Geological Survey (USGS) Open File, No. 93-0560-B, 4 discs. $ 40.00GlobalComputer Program, Geophysical map workshop
DS201905-1025
2019
Grauchm V.J.S.Drenth, B.J., Grauchm V.J.S.Finding the gap in America's magnetic maps. ( Apr. 16, 2019)EOS, https://spaces.hightail. com/receive/ 2jvDHdtWRrUnited States, Arkansas, Missouri, Tennesseegeophysics, magnetic
DS1987-0108
1987
Grauert, B.Chernyshev, I.V., Kononova, V.A., Kramm, W., Grauert, B.Isotopic geochronology of Ural alkaline rocks based ion zircon uranium leaddata.(Russian)Geochemiya, (Russian), No. 3, pp. 323-338GlobalBlank
DS1990-1219
1990
Graup, G.Reimold, W.U., McGee, T., Graup, G.Search for dynamic deformation effects in contact breccias from South african kimberlite pipes21st. Lunar And Planetary Science Conference, March 12-16, Houston, March 16 presentationSouth AfricaAlteration, Kimberlite-breccias
DS2003-0379
2003
Graup, G.El Goresy, A., Dubrovinsky, L.S., Gillet, P., Mostefaoul, S., Graup, G.A new natural super hard transparent polymorph of carbon from the Popigai impactComptes Rendus Geosciences, IN FRENCH, Vol. 335, 12, Oct. pp. 889-898.RussiaBlank
DS200412-0515
2003
Graup, G.El Goresy, A., Dubrovinsky, L.S., Gillet, P., Mostefaoul, S., Graup, G., Drakopoulos, M., Simionovici, A.S.A new natural super hard transparent polymorph of carbon from the Popigai impact crater, Russia.Comptes Rendus Geoscience, Vol. 335, 12, Oct. pp. 889-898.RussiaLonsdaleite, graphite, mineralogy
DS201412-0222
2003
Graup, G.El Goresy, A., Dubrovinsky, L.S., Gillet, P., Mostefaoui, S., Graup, G., Drakopoulos, M., Simionovici, A.S., Swamy, V., Masaitis, V.L.A new natural, super-hard, transparent polymorph of carbon from the Popigai impact crater, Russia.Comptes Rendus Geoscience, Vol. 335, pp. 889-898.Russia, YakutiaMeteorite
DS1985-0244
1985
Gravchev, A.F.Gravchev, A.F., Nikolaichik, V.V., Trubu*itsyn, V.P.The nature of a regular form of ultrabasic xenoliths in basalts and the regularities of their size distribution.(Russian)Doklady Academy of Sciences Akademy Nauk SSSR, (Russian), Vol. 285, No. 6, pp. 1433-1435RussiaBlank
DS200612-0492
2005
Gravel, J.Gravel, J., et al.Acme Analytical Laboratories Ltd. & GGL. Diamonds - Soil and lake sediment geochemistry in diamond exploration, NWT, Canada.32ndYellowknife Geoscience Forum, p. 23 abstractCanada, Northwest TerritoriesGeochemistry - GGL Diamonds
DS201512-1937
2015
Gravel, J.Mackay, D.A.R., Simandl, G.J.,Ma, W., Gravel, J., Redfearn, M.Indicator minerals in exploration for speciality metal deposits: a QEMSCAN approach.Symposium on critical and strategic materials, British Columbia Geological Survey Paper 2015-3, held Nov. 13-14, pp. 211-218.TechnologyRare earths

Abstract: Quantitative Evaluation of Materials by Scanning electron microscopy (QEMSCAN®) was used to assess carbonatite indicator minerals in fl uvial sediments from the drainage area of the Aley carbonatite, in north-central British Columbia. QEMSCAN® is a viable method for rapid detection and characterization of carbonatite indicator minerals with minimal processing other than dry sieving. Stream sediments from directly above, and up to 11 km downstream, of the carbonatite deposit were selected for this indicator mineral study. The geology of the Aley carbonatite is described by Mäder (1986), Kressal et al. (2010), McLeish (2013), Mackay and Simandl (2014), and Chakhmouradian et al. (2015). Traditional indicator mineral exploration methods use the 0.25-2.0 mm size fraction of unconsolidated sediments (Averill, 2001, 2014; McCurdy, 2006, 2009; McClenaghan, 2011, 2014). Indicator minerals are detectable by QEMSCAN® at particle sizes smaller than those used for hand picking (<0.25 mm). Pre-concentration (typically by shaker table) is used before heavy liquid separation, isodynamic magnetic separation, optical identifi cation using a binocular microscope, and hand picking (McClenaghan, 2011). Following additional sieving, the 0.5-1 and 1-2 mm fractions are hand picked for indicator minerals while the 0.25-0.5 mm fraction is subjected to paramagnetic separation before hand picking (Averill, 2001; McClenaghan, 2011). Hand picking indicator minerals focuses on monomineralic grains, and composite grains may be lost during processing. Composite grains are diffi cult and time consuming to hand pick and characterize using optical and Scanning Electron Microscopy (SEM) methods. A single grain mount can take 6-12 hours to chemically analyse (Layton- Matthews et al., 2014). Detailed sample analysis using the QEMSCAN® Particle Mineral Analysis routine allows for 5-6 samples to be analyzed per day. When only mineral identifi cation and mineral concentrations and counts are required, the use of a Bulk Mineral Analysis routine reduces the analysis time from ~4 hours to ~30 minutes per sample.
DS201605-0864
2016
Gravel, J.Mackay, D.A.R., Simandl, G.J., Ma, W., Redfearn, M., Gravel, J.Indicator mineral-based exploration for carbonatites and related specialty metal deposits - a QEMSCAN orientation survey, British Columbia. Aley, Lonnie, WicheedaJournal of Geochemical Exploration, Vol. 165, pp. 159-173.Canada, British ColumbiaGeochemistry - carbonatites

Abstract: This orientation survey indicates that Quantitative Evaluation of Materials by Scanning electron microscopy (QEMSCAN®) is a viable alternative to traditional indicator mineral exploration approaches which involve complex processing followed by visual indicator mineral hand-picking with a binocular microscope. Representative polished smear sections of the 125-250 µm fraction (dry sieved and otherwise unprocessed) and corresponding Mozley C800 table concentrates from the drainages of three carbonatites (Aley, Lonnie, and Wicheeda) in the British Columbia Alkaline Province of the Canadian Cordillera were studied. Polished smear sections (26 × 46 mm slide size) contained an average of 20,000 exposed particles. A single section can be analyzed in detail using the Particle Mineral Analysis routine in approximately 3.5-4.5 h. If only mineral identification and mineral concentrations are required, the Bulk Mineral Analysis routine reduces the analytical time to 30 min. The most useful carbonatite indicator minerals are niobates (pyrochlore and columbite), REE-fluorocarbonates, monazite, and apatite. Niobate minerals were identified in the 125-250 µm fraction of stream sediment samples more than 11 km downstream from the Aley carbonatite (their source) without the need for pre-concentration. With minimal processing by Mozley C800, carbonatite indicator minerals were detected downstream of the Lonnie and Wicheeda carbonatites. The main advantages of QEMSCAN® over the traditional indicator mineral exploration techniques are its ability to: 1) analyze very small minerals, 2) quickly determine quantitative sediment composition and mineralogy by both weight percent and mineral count, 3) establish mineral size distribution within the analyzed size fraction, and 4) determine the proportions of monomineralic (liberated) grains to compound grains and statistically assess mineral associations in compound grains. One of the key advantages is that this method permits the use of indicator minerals based on their chemical properties. This is impossible to accomplish using visual identification.
DS201801-0063
2017
Gravel, J.Simandl, G.J., Mackay, D.A.R., Ma, X., Luck, P., Gravel, J., Akam, C.The direct indicator mineral concept and QEMSCAN applied to exploration for carbonatite and carbonatite related ore deposits.in: Ferbey, T. Plouffe, A., Hickein, A.S. eds. Indicator minerals in tills and stream sediments of the Canadian Cordillera. Geological Association of Canada Special Paper,, Vol. 50, pp. 175-190.Canada, British Columbiacarbonatite - Aley, Lonnie, Wicheeda

Abstract: This volume consists of a series of papers of importance to indicator minerals in the Canadian Cordillera. Topics include the glacial history of the Cordilleran Ice Sheet, drift prospecting methods, the evolution of survey sampling strategies, new analytical methods, and recent advances in applying indicators minerals to mineral exploration. This volume fills a notable knowledge gap on the use of indicator minerals in the Canadian Cordillera. We hope that the volume serves as a user guide, encouraging the wider application of indicator minerals by the exploration community.
DS1987-0170
1987
GravelleDupont, P.L., Lapierre, H., Gravelle, BertrandCaracterisation du magmatism Proterozoique superieur en Afrique de l'ouestet implications geodynamiques: rrifts intracratoniques au Panafricain?Canadian Journal of Earth Sciences, Vol. 24, pp. 96-109.GlobalAlkaline rocks, magmatism
DS1995-0551
1995
Gravelle, J.Forster, D., Gravelle, J.Structuring foreign investments in the mining industryMining Tax Strategies, Held Feb. 1995, 25pCanadaTaxation, Economics -foreign investments
DS201212-0258
2012
Gravelle, J.Gravelle, J.Examining flow through shares in the mining sector.Canadian Mining Journal, June/July p. 34.CanadaFlow thru
DS1975-1037
1979
Gravenor, C.P.Gravenor, C.P., Gostin, V.A.Mechanisms to Explain the Loss of Heavy Minerals from Upper paleozoic Tillites of South Africa and Australia and the Late Precambrian Tillites of Australia.Sedimentology, Vol. 26, PP. 707-717.Australia, South AfricaHeavy Mineral Concentrates
DS200912-0265
2008
Graves, B.Graves, B.NI43-101 - some tricks and traps.Investing in Mining, mineweb.com, Vol. 2. pp. 16-17.CanadaLegal
DS1930-0273
1938
Graves, H.B. JR.Graves, H.B. JR.The Precambrian Structure of MissouriAcademy of Science ST. LOUIS Transactions, Vol. 29, No. 5, PP. 111-164.Missouri, United States, Central StatesBlank
DS200712-0084
2006
GravieBlowes, D.,Moncur, M., Smith, L., Sego, D., Klassen, Neuner, Gravie, Gould, ReinsonMining in the continuous permafrost: construction and instrumentation of two large scale waste rock piles.34th Yellowknife Geoscience Forum, p. 6. abstractCanada, Northwest TerritoriesMining - Diavik
DS200412-0712
2003
Gravity Capital Ltd.Gravity Capital Ltd.Behind the broken engagement... merger with Dwyka Diamonds.Australia's Paydirt, July, 28, 1p.AustraliaNews item Dwyka Diamonds
DS1920-0230
1925
Grawe, O.R.Grawe, O.R.Some Breccia of the St. Louis Formation in the St. Louis Missouri Region.Washington University Studies, Vol. 13, SCI. SER., No. 1, PP. 45-62.Missouri, United States, Central StatesCryptoexplosion
DS1920-0231
1925
Gray, A.Gray, A.Sixty Years Ago: Wanderings of a Stonyhurst Boy in Many LandLondon: John Murray, 306P.South Africa, BotswanaKimberley, Travelogue
DS1975-0152
1975
Gray, A.Nixon, P.H., Gray, A.Significance of Iron Oxide Carbonate Chert Argillite Metasediment Xenoliths from the Sub-karroo Basement of Lesotho.Leeds University Research Institute of African Geology Annual Report, Vol. 19, PP. 42-44.LesothoSekameng, Liqhobong, Kao, Matsuko, Mothae, Melkfontein, Petrograp
DS1992-1127
1992
Gray, A.Nixon, P.H., Davies, G.R., Rex, D.C., Gray, A.Venezuelan kimberlitesJournal of Volcanology and geothermal research, Vol. 50, No. 1/2, April 15, pp. 101-116VenezuelaKimberlites, Occurrences
DS1989-1045
1989
Gray, B.A.Montgomery, C.W., Gray, B.A.Ages and Strontium isotope systematics of Archean basement rocks from the south central Beartooth MountainsThe Mountain Geologist, Vol. 26, No. 3, July pp. 75-80MontanaGeochronology, Beartooth Mountains
DS1970-0776
1973
Gray, C.M.Moore, A.C., Gray, C.M.Carbonatites of the Strangways Range, Central Australia: Evidence from Strontium Isotopes.Geological Society AUST. Journal, Vol. 20, PP. 71-73.AustraliaRelated Rocks
DS1985-0545
1985
Gray, C.M.Price, R.C., Johnson, R.W., Gray, C.M., Frey, F.A.Geochemistry of Phonolites and Trachytes from the Summit Region of Mt. Kenya.Contributions to Mineralogy and Petrology, Vol. 89, No. 4, PP. 394-409.East Africa, KenyaGeochemistry
DS1991-1380
1991
Gray, C.M.Price, R.C., Gray, C.M., Wilson, R.E., Frey, F.A.The effects of weathering on rare earth element, Yttrium and Barium abundances in Tertiary basalts from southeastern AustraliaChemical Geology, Vol. 93, No. 3/4, December 5, pp. 245-266AustraliaWeathering, Yttrium, Barium, Rare earths, basalts
DS1991-1381
1991
Gray, C.M.Price, R.C., Gray, C.M., Wilson, R.E., Frey, F.A., Taylor, S.R.The effects of weathering on rare-earth element Yttrium and Barium abundances in Tertiary basalts from southeastern AustraliaChemical Geology, Vol. 93, No. 3/4, December 5, pp. 245-266AustraliaTholeiitic basalts, Geochemistry, rare earths, weathering
DS1993-1128
1993
Gray, C.M.Nicholls, I.A., Greig, A.G., Gray, C.M., Price, R.C.Newer volcanics province- basalts, xenoliths and megacrystsAustralia Geological Survey AGSO, Record No. 1993/58, $ 16.95AustraliaNewer Volcanics, Xenoliths
DS1997-0925
1997
Gray, C.M.Price. R.C., Gray, C.M., Frey, F.A.Strontium isotopic and trace element heterogeneity in the plains basalts of Newer Volcanic Province, VictoriaGeochimica et Cosmochimica Acta, Vol. 61, No. 1, pp. 171-92.AustraliaGeochronology, Alkaline rocks
DS2003-0485
2003
Gray, D.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
Gray, D.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
Gray, D.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
Gray, D.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
DS1997-0438
1997
Gray, D.R.Gray, D.R., Foster, D.A.Orogenic concepts - application and definition: Lachlan Fold Belt, EasternAustraliaAmerican Journal of Science, Vol. 297, No. 9, Nov. 1, pp. 859-891AustraliaTectonics, Lachlan fold belt
DS1997-0439
1997
Gray, D.R.Gray, D.R., Foster, D.A., Bucher, M.Recognition and definition of orogenic events in the Lachlan Fold BeltAustralian Journal ofEarth Science, Vol. 44, No. 4, Aug. pp. 489-502AustraliaTectonics, orogeny, Lachlan Fold Belt, model
DS1997-1077
1997
Gray, D.R.Soesoo, A., Bons, P.D., Gray, D.R., Foster, D.A.Divergent double subduction: tectonics and petrologic consequencesGeology, Vol. 25, No. 8, August pp. 755-758.MantleTectonics, Subduction
DS2000-0300
2000
Gray, D.R.Foster, D.A., Gray, D.R.Timing of orogenic events in the Lachlan Orogen (2000)Australian Journal of Earth Sciences, Vol. 47, No. 4, Aug. 1, pp. 813-22.AustraliaTectonics - orogeny
DS200512-1028
2004
Gray, D.R.Spaggiardi, C.V., Gray, D.R., Foster, D.A.Lachlan Orogen subduction accretion systematics revisited.Australia Journal of Earth Sciences, Vol. 51, 4, pp. 549-553.AustraliaSubduction - not specific to diamonds
DS200912-0261
2009
Gray, D.R.Goscombe, B.D., Gray, D.R.Metamorphic response in orogens of different obliquity, scale and geometry.Gondwana Research, Vol. 15, 2, pp. 151-167.MantleUHP
DS1980-0145
1980
Gray, F.Gray, F.Lherzolite and Wehrlitic Rock Series at Tincup Peak, Klamath Mountains, S.w. Oregon.Geological Society of America (GSA), Vol. 12, No. 3, P. 108. (abstract.).United States, Oregon, Rocky MountainsBlank
DS1985-0245
1985
Gray, F.Gray, F., Page, N.J., Wilson, S.A., Carlson, R.R.Contrasting Petrology and Platinum Group Elements (pge) Geochemistry of Zoned Ultramafic Complexes, Klamath Mountains, California and Oregon.Canadian Mineralogist., Vol. 23, PT. 2, MAY P. 304. (abstract.).United States, West Coast, California, OregonGeochemistry, Geochronology, Petrography
DS1991-1897
1991
Gray, F.Wynn, J.C., Olmore, S.D., Gray, F., Day, W.C.U.S. Geological Survey mineral resource and tectonic studies in Venezuela.-brief overviewUnited States Geological Survey (USGS) Circ, No. C1062, pp. 80-83VenezuelaTectonics, Kimberlite
DS1993-0569
1993
Gray, F.Gray, F.Diamond bearing kimberlite pipes. #2United States Geological Survey (USGS) Bulletin, No. B2062, pp. 75-77.VenezuelaDiatremes, Kimberlites
DS1993-0570
1993
Gray, F.Gray, F., Orris, G.J.Placer diamondUnited States Geological Survey (USGS) Bulletin, No. B2062, pp. 86-88.Venezuela, GuyanaAlluvials, Diamonds
DS1993-1170
1993
Gray, F.Orris, G.J., Page, N.J., Bolm, K.S., Gray, F.Mines, prospects and occurrences of the Venezuelan Guayana ShieldUnited States Geological Survey (USGS) Bulletin, No. B2062, pp. 29-53.Venezuela, GuyanaDiamonds
DS1994-0656
1994
Gray, F.Gray, F.Industrial diamonds..A review of 1993 activitiesMining Engineering, Vol. 46, No. 7, July p. 662.United StatesEconomics
DS1995-0672
1995
Gray, F.Gray, F.Industrial diamonds: a review of 1994 activitiesMining Engineering, Vol. 47, No. 7, July 1/2 pg. p. 661.United StatesDiamonds -industrial, Economics
DS1995-2086
1995
Gray, F.Wynn, J.C., Sidder, G.B., Gray, F., Page, N.J., Mendoza, V.Geology and mineral deposits of the Venezuelan Guayana shield... goldUnited States Geological Survey (USGS) Bulletin, No. 2124-A, approx. 150pVenezuela, GuyanaBook -table of contents, Geophysics, Lo Increible, Sierra Verdun, Cerro ArrendaJ.
DS1993-0571
1993
Gray, J.Gray, J., Lauriol, B., Bruneau, D., Ricard, J.Post glacial emergence of Ungava Peninsula, and its relationship to glacialhistory.Canadian Journal of Earth Sciences, Vol. 30, No. 8, August pp. 1676-1696.QuebecGeomorphology
DS2002-0610
2002
Gray, J.Gray, J.Queen's University mineralogy field trip to Ilmaussaq, south Greenland: a travelogueMineralalogical Association of Canada Newsletter, No. 66, Jan. pp. 1,8-11.GreenlandAlkaline rocks
DS1997-0136
1997
Gray, J.T.Bruneau, D., Gray, J.T.Ecoulements glaciares et deglaciation hative 11 Ka Bp? du nord est de la peninsule d'Ungava, Quebec.Canadian Journal of Earth Sciences, Vol. 34, pp. 1089-1100.Quebec, Ungava, LabradorGeomorphology - tills
DS2001-0406
2001
Gray, J.T.Gray, J.T., Gosse, J.C., Marquette, G.Weathering zones in the Torngat Mountains Labrador, ice sheet thickness and basal thermal regime.Geological Association of Canada (GAC) Annual Meeting Abstracts, Vol. 26, p.54, abstract.Quebec, Ungava, LabradorGeomorphology, Laurentide Ice Sheet
DS1940-0084
1944
Gray, J.W.Gray, J.W.Historic Romance of DiamondsIndiana: Graessle-mercer., United StatesKimberlite
DS201412-0949
2014
Gray, K.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
DS1993-1515
1993
Gray, K.J.Southworth, C.S., Gray, K.J., Sutter, J.F.Middle Eocene intrusive igneous rocks of the Central Appalachian Valley and Ridge Province -setting, chemistry, structureU.s. Geological Survey Bulletin, Vol. 1839-J, 21pAppalachiaIgneous rocks, Geochemistry
DS201512-1981
2015
Gray, L.Van Wychen, W., Copland, L., Burgess, D.O., Gray, L., Schaffer, N., Fisher, T.Glacier velocities and dynamic discharge from the ice masses of Baffin Island and Bylot Island, Nunavut, Canada.Canadian Journal of Earth Sciences, Vol. 52, 11, pp. 980-989.Canada, Nunavut, Baffin IslandGeomorphology

Abstract: Speckle tracking of ALOS PALSAR fine beam data from 2007-2011 are used to determine the surface motion of major ice masses on Baffin Island and Bylot Island in the southern Canadian Arctic Archipelago. Glacier velocities are low overall, with peaks of ~100 m a-1 and means of ~20-60 m a-1 common along the main trunk of many outlet glaciers. Peak velocities on Penny and Bylot Island ice caps tend to occur near the mid-sections of their primary outlet glaciers, while the fastest velocities on all other glaciers usually occur near their termini due to relatively large accumulation areas draining through narrow outlets. Estimates of ice thickness at the fronts of tidewater-terminating glaciers are combined with the velocity measurements to determine a regional dynamic discharge rate of between ~17 Mt a-1 and ~108 Mt a-1, with a mid-point estimate of ~55 Mt a-1, revising downward previous approximations. These velocities can be used as inputs for glacier flow models, and provide a baseline dataset against which future changes in ice dynamics can be detected.
DS2002-0611
2002
Gray, R.Gray, R.Proximal and distal relationship between coarse gravel beach remnants of the Plio-Pleistocene Orange River delta.11th. Quadrennial Iagod Symposium And Geocongress 2002 Held Windhoek, Abstract p. 28.NamibiaAlluvials
DS201212-0259
2012
Gray, R.Gray, R., Pysklywec, R.N.Geodynamic models of mature continental collision: evolution of an orogen from lithospheric suduction to continental retreat/delamination.Journal of Geophysical Research, Vol. 117, B03408, 14p.MantleGeodynamics - subduction
DS1997-0440
1997
Gray, S.Gray, S.In line pressure JIG - the Australasian mining industry supporting innovative new technologyAustralian Institute of Mining and Metallurgy (AusIMM) Bulletin, No. 4, June pp. 35, 37-40AustraliaMining, Mineral processing - JIG
DS200412-0672
2004
Gray, W.Glazner, A.F., Bartley, J.M., Coleman, D.S., Gray, W., Taylor, R.Z.Are plutons assembled over millions of years by amalgamation from small magma chambers?Geology Today, Vol. 14, 4, pp. 4-11.TechnologyMagmatism - not specific to diamonds
DS202007-1165
2020
Grayver, A.V.Munch, F.D., Grayver, A.V., Guzavina, M., Kuvshinov, A.V., Khan, A.Joint inversion of daily and long period geomagnetic transfer functions reveals lateral variations in mantle water content.Journal of Geophysical Letters, Vol. 47, e2020GL087222Mantlewater

Abstract: The amount of water trapped in the Earth's interior has a strong effect on the evolution and dynamics of the planet, which ultimately controls the occurrence of earthquakes and volcanic eruptions. However, the distribution of water inside the Earth is not yet well understood. To study the Earth's deep interior, we make use of changes in the Earth's magnetic field to detect variations in electrical conductivity inside the planet. Electrical conductivity is a characteristic of a rock that varies with temperature and water content. Here, we present a novel methodology to estimate the amount of water in different regions of Earth's mantle. Our analysis suggests the presence of small amounts of water in the mantle underneath Europe, whereas larger amounts are expected beneath North America and northern Asia.
DS201708-1653
2017
Greaney, A.Greaney, A.Chalcophile elements in the mantle.11th. International Kimberlite Conference, PosterMantlechalcophile
DS200812-0428
2008
GreatFalls TribuneGreatFalls TribuneGrass Range mine shows promise of holding diamonds. Delta's Rodii is interviewed.GreatFalls, Tribune, May 26, 2p.United States, MontanaNews item - Delta
DS1950-0212
1955
GreatorexGreatorexDiamond Fever. #1London: Cassell And Co. Ltd., 223P.GuyanaKimberlite, Kimberley, History
DS1950-0327
1957
Greatorex, W.Greatorex, W.Diamond Fever. #2London: Cassell And Co, M., 223P.South America, Guyana, GuianaKimberlite
DS201112-0386
2011
Greau, Y.Greau, Y., Huang, J-X., Griffin, W.L., Renac, C., Alard, O., O'Reilly, S.Y.Type 1 eclogite from Roberts Victor kimberlites: products of extensive mantle metasomatism.Geochimica et Cosmochimica Acta, Vol. 75, 22, pp. 6927-2954.Africa, South AfricaDeposit - Roberts Victor
DS201212-0313
2012
Greau, Y.Huang, J.-X., Griffin, W.L., Greau, Y., O'Reilly, S.Y.Seeking the primary compositions of mantle xenoliths: isotopic and elemental consequences of sequential leaching treatments on an eclogite suite.Chemical Geology, in press availableAfrica, South AfricaDeposit - Roberts Victor
DS201212-0314
2012
Greau, Y.Huang, J-X., Greau, Y., Griffin, W.L., O'Reilly, S.Y., Pearson, N.J.Multi-stage origin of Roberts Victor eclogites: progressive metasomatism and its isotopic effects.Lithos, in press availableAfrica, South AfricaDeposit - Roberts Victor
DS201312-0333
2013
Greau, Y.Greau, Y., Alard, O., Griffin, W.L., Huang, J-X., O'Reilly, S.Y.Sulfides and chalcophile elements in Roberts Victor eclogites: unravelling a sulfide rich metasomatic event.Chemical Geology, Vol. 354, pp. 73-92.Africa, South AfricaDeposit - Roberts Victor
DS201312-0407
2013
Greau, Y.Huang, J-X., Griffin, W.L., Greau, Y., Pearson, N.J., O'Reilly, S.Y.Unmasking enigmatic xenolithic eclogites: progressive metasomatism on a key Roberts Victor sample.Goldschmidt 2013, AbstractAfricaKamafugite
DS201412-0314
2014
Greau, Y.Griffin, W.L., Batumike, J.M., Greau, Y., Pearson, N.J., Shee, S.R., O'Reilly, S.Y.Emplacement ages and sources of kimberlites and related rocks in southern Africa: U-Pb ages and Sr-Nd isotopes of groundmass perovskite.Contributions to Mineralogy and Petrology, Vol. 167, pp. 1032-37.Africa, southern AfricaDeposit - geochronology
DS201412-0380
2014
Greau, Y.Huang, J-X., Griffin, W.L., Greau, Y., Pearson, N.J., O'Reilly, S.Y., Cliff, J., Martin, L.Unmasking xenolithic eclogites: progressive metasomatism of a key Roberts Victor sample.Chemical Geology, Vol. 364, pp. 55-65.Africa, South AfricaDeposit - Roberts Victor
DS201412-0381
2014
Greau, Y.Huang, J-X., Li, P., Griffin, W.L., Xia, Q-K, Greau, Y., Pearson, N.J., O'Reilly, S.Y.Water contents of Roberts Victor xenolithic eclogites: primary and metasomatic controls.Contributions to Mineralogy and Petrology, Vol. 168, pp. 1092-1095Africa, South AfricaDeposit - Roberts Victor
DS201502-0063
2014
Greau, Y.Huang, J-X., Li, P., Griffin, W.L., Xia, Q-K, Greau, Y., Pearson, N.J., O'Reilly, S.Y.Water contents of Roberts Victor xenolithic eclogites: primary and metasomatic controls.Contributions to Mineralogy and Petrology, Vol. 168, pp. 1092-1105.Africa, South AfricaDeposit - Roberts Victor
DS201610-1872
2016
Greau, Y.Huang, J-X., Xiang, Y., An, Y., Griffin, W.L., Greau, Y., Xie, L., Pearson, N.J., Yu, H., O'Reilly, S.Y.Magnesium and oxygen isotopes in Roberts Victor eclogites.Chemical Geology, Vol. 438, pp. 73-83.Africa, South AfricaDeposit - Roberts Victor

Abstract: Magnesium and oxygen are critical elements in the solid Earth and hydrosphere. A better understanding of the combined behavior of Mg and O isotopes will refine their use as a tracer of geochemical processes and Earth evolution. In this study, the Mg-isotope compositions of garnet and omphacite separated from well-characterized xenolithic eclogites from the Roberts Victor kimberlite pipe (South Africa) have been measured by solution multi-collector ICP-MS. The reconstructed whole-rock d26Mg values of Type I (metasomatized) eclogites range from - 0.61‰ to - 0.20‰ (Type IA) and from - 0.60‰ to - 0.30‰ (Type IB) (mean - 0.43‰ ± 0.12‰), while d26Mg of Type IIA (fresh, least metasomatized) eclogites ranges from - 1.09‰ to - 0.17‰ (mean - 0.69‰ ± 0.41‰); a Type IIB (fresh, least metasomatized) has d26Mg of - 0.37‰. Oxygen-isotope compositions of garnet were analyzed in situ by SIMS (CAMECA 1280) and cross-checked by laser fluorination. Garnets have d18O of 6.53‰ to 9.08‰ in Type IA, 6.14‰ to 6.65‰ in Type IB, and 2.34‰ to 2.91‰ in Type IIB. The variation of d26Mg and d18O in Type IA and IB eclogites is consistent with the previously proposed model for the evolution of these samples, based on major and trace elements and radiogenic isotopes. In this model, the protoliths (Type II eclogites) were metasomatized by carbonatitic to kimberlitic melts/fluids to produce first Type IA eclogites and then Type IB. Metasomatism has changed the O-isotope compositions, but the Mg-isotope compositions of Type IA are mainly controlled by the protoliths; those of Type IB eclogites reflect mixing between the protoliths and the kimberlitic melt/fluid. The combination of a large range of d26Mg and low d18O in Type II eclogites cannot be explained easily by seawater alteration of oceanic crust, interaction of carbonate/silicate sediments with oceanic crust, or partial melting of mafic rocks.
DS201702-0254
2017
Greau, Y.Xu, B., Griffin, W.L., Xiong, Q., Hou, Z-Q, O'Reilly, S.Y., Guo, Z., Pearson, N.J., Greau, Y., Yang, Z-M., Zheng, Y-C.Ultrapotassic rocks and xenoliths from South Tibet: contrasting styles of interaction between lithospheric mantle and asthenosphere during continental collision.Geology, Vol. 45, 1, pp. 51-54.China, TibetUPR - metasomatism

Abstract: Widespread Miocene (24-8 Ma) ultrapotassic rocks and their entrained xenoliths provide information on the composition, structure, and thermal state of the sub-continental lithospheric mantle in southern Tibet during the India-Asia continental collision. The ultrapotassic rocks along the Lhasa block delineate two distinct lithospheric domains with different histories of depletion and enrichment. The eastern ultrapotassic rocks (89°E-92°E) reveal a depleted, young, and fertile lithospheric mantle (87Sr/86Srt = 0.704-0.707 [t is eruption time]; Hf depleted-mantle model age [TDM] = 377-653 Ma). The western ultrapotassic rocks (79°E-89°E) and their peridotite xenoliths (81°E) reflect a refractory harzburgitic mantle refertilized by ancient metasomatism (lavas: 87Sr/86Srt = 0.714-0.734; peridotites: 87Sr/86Srt = 0.709-0.716). These data integrated with seismic tomography suggest that upwelling asthenosphere was diverted away from the deep continental root beneath the western Lhasa block, but rose to shallower depths beneath a thinner lithosphere in the eastern part. Heating of the lithospheric mantle by the rising asthenosphere ultimately generated the ultrapotassic rocks with regionally distinct geochemical signatures reflecting the different nature of the lithospheric mantle.
DS201906-1293
2019
Greau, Y.Gain, S.E.M., Greau, Y., Henry, H., Belousova, E., Dainis, I., Griffin, W.L., O'Reilly, S.Y.Mud Tank zircon: long term evaluation of a reference material for U-Pb dating, Hf-isotope analysis and trace element analysis. ( Carbonatite)Geostandards and Geoanalytical Research, in press available, 16p.Australiadeposit - Mud Tank

Abstract: Zircon megacrysts from the Mud Tank carbonatite, Australia, are being used in many laboratories as a reference material for LA-ICP-MS U-Pb dating and trace element measurement, and LA-MC-ICP-MS determination of Hf isotopes. We summarise a database of > 10000 analyses of Mud Tank zircon (MTZ), collected from 2000 to 2018 during its use as a secondary reference material for simultaneous U-Pb and trace element analysis, and for Hf-isotope analysis. Trace element mass fractions are highest in dark red-brown stones and lowest in colourless and gem-quality ones. Individual unzoned grains can be chemically homogeneous, while significant variations in trace element mass fraction are associated with oscillatory zoning. Chondrite-normalised trace element patterns are essentially parallel over large mass fraction ranges. A Concordia age of 731.0 ± 0.2 Ma (2s, n = 2272) is taken as the age of crystallisation. Some grains show lower concordant to mildly discordant ages, probably reflecting minor Pb loss associated with cooling and the Alice Springs Orogeny (450-300 Ma). Our weighted mean 176Hf/177Hf is 0.282523 ± 10 (2s, n = 9350); the uncertainties on this ratio reflect some heterogeneity, mainly between grains. A few analyses suggest that colourless grains have generally lower 176Hf/177Hf. MTZ is a useful secondary reference material for U-Pb and Hf-isotope analysis, but individual grains need to be carefully selected using CL imaging and tested for homogeneity, and ideally should be standardised by solution analysis.
DS200712-0353
2006
Greaux, S.Gautron, L., Greaux, S., Andrault, D., Bolfan Casanova, N., Guignot,N., Bouhifd, M.A.Uranium in the Earth's lower mantle.Geophysical Research Letters, Vol. 33, 23, Dec. 16, L23301MantleUranium
DS201612-2304
2016
Greaux, S.Ichikawa, H., Greaux, S., Azuma, S.Subduction of the primordial crust into the deep mantle.Geoscience Frontiers, in press availableMantleSubduction

Abstract: The primordial crust on the Earth formed from the crystallization of the surface magma ocean during the Hadean. However, geological surveys have found no evidence of rocks dating back to more than 4 Ga on the Earth's surface, suggesting the Hadean crust was lost due to some processes. We investigated the subduction of one of the possible candidates for the primordial crust, anorthosite and KREEP crust similar to the Moon, which is also considered to have formed from the crystallization of the magma ocean. Similar to the present Earth, the subduction of primordial crust by subduction erosion is expected to be an effective way of eliminating primordial crust from the surface. In this study, the subduction rate of the primordial crust via subduction channels is evaluated by numerical simulations. The subduction channels are located between the subducting slab and the mantle wedge and are comprised of primordial crust materials supplied mainly by subduction erosion. We have found that primordial anorthosite and KREEP crust of up to ~50 km thick at the Earth's surface was able to be conveyed to the deep mantle within 0.1-2 Gy by that mechanism.
DS201701-0020
2016
Greaux, S.Liu, Z., Du, W., Shinmei, T., Greaux, S., Zhou, C., Arimoto, T., Kunimoto, T., Irifune, T.Garnets in the majorite pyrope system: symmetry, lattice microstain, and order-disorder of cations.Physics and Chemistry of Minerals, in press available 9p.TechnologyGarnet morphology

Abstract: We present a systematic experimental study on the phase transition, lattice microstrain, and order-disorder of cations for garnets in the majorite-pyrope system. Polycrystalline gem-quality garnets were synthesized at high pressure and high temperature using a Kawai-type multi-anvil apparatus. A phase transition from a cubic to tetragonal structure is clearly observed for garnets with the majorite content of more than 74 mol % through X-ray diffraction (XRD) and Raman scattering studies. Microstrain of garnets, evaluated with the Williamson-Hall plot on XRD profiles, shows a nonlinear dependence of the garnet compositions. The variation of the XRD peak broadening suggests the lattice microstrain of these garnets may be associated with the local structural heterogeneities due to the substitution of different cations via the coupled substitution (Mg2+ + Si4+ = 2Al3+) in the garnet structure. The width variation of Raman scattering peaks indicates that cation disorder occurs in the garnet structure for intermediate compositions. It is found that intermediate garnets and end-members have a minimum of microstrain, while those between end-members and intermediate compositions possess a larger microstrain.
DS201709-2059
2017
Greaux, S.Stagno, V., Kono, Y., Greaux, S., Kebukawa, Y., Stopponi, V., Scarlato, P., Lustrino, M., Irifune, T.From carbon in meteorites to carbonatite rocks on Earth.Goldschmidt Conference, abstract 1p.Globalcarbonatite

Abstract: The composition of the early Earth’s atmosphere is believed to result from significant magma outgassing during the Archaean eon. It has been widely debated whether the oxygen fugacity (fo2) of the Earth’s mantle has remained constant over the last ~3.8 Ga to levels where volatiles were mostly in their mobile form [1,2], or whether the mantle has experienced a gradual increase of its redox state [3]. Both hypotheses raise fundamental questions on the effect of composition of the early Earth’s accreting material, the origin and availability of primordial carbon in Earth’s interior, and the migration rate of CO2-rich magmas. In addition, the occurrence in nature of carbonatites (or silicate-carbonatitic rocks), diamonds and carbides indicate a dominant control of the mantle redox state on the volatile speciation over time and, maybe, on mechanisms of their formation, reaction and migration through the silicate mantle. A recent model has been developed that combines both experimental results on the fo2 of preserved carbonaceous chondrites at high pressure and thermodynamic predictions of the the temporal variation of the mantle redox state, with the CO2-bearing magmas that could form in the early asthenospheric mantle. Since any variation in melt composition is expected to cause significant changes in the physical properties (e.g., viscosity and density), the migration rate of these magmas has been determined using recent in situ viscosity data on CO2-rich melts with the falling sphere technique. Our results allow determining the composition of CO2- bearing magmas as function of the increasing mantle redox state over time, and the mechanisms and rate for exchange of carbon between mantle reservoirs.
DS201903-0513
2018
Greaux, S.Greaux, S., Yamada, A.Density variations of Cr-rich garnets in the upper mantle inferred from the elasticity of uvarovite garnet.Comptes Rendu Geoscience, doi.org/10.16/ j.crte.2018.09.012 9p.MantleUHP

Abstract: The thermoelastic parameters of Ca3Cr2Si3O12 uvarovite garnet were examined in situ at high pressure up to 13 GPa and high temperature up to 1100 K by synchrotron radiation energy-dispersive X-ray diffraction within a 6-6-type multi-anvil press apparatus. A least-square fitting of room T data to a third-order Birch-Murnaghan (BM3) EoS yielded K0 = 164.2 ± 0.7 GPa, V0 = 1735.9 ± 0.3 Å3 (K’0 fixed to 4.0). P-V-T data were fitted simultaneously by a modified HT-BM3 EoS, which gave the isothermal bulk modulus K0 = 163.6 ± 2.6 GPa, K’0 = 4.1 ± 0.5, its temperature derivative (?K0,T/?T)P = -0.014 ± 0.002 GPa K-1, and the thermal expansion coefficients a0 = 2.32 ± 0.13 ×10-5 K-1 and b0 = 2.13 ± 2.18 ×10-9 K-2 (K’0 fixed to 4.0). Our results showed that the Cr3+ enrichment in natural systems likely increases the density of ugrandite garnets, resulting in a substantial increase of mantle garnet densities in regions where Cr-rich spinel releases chromium through a metasomatic reaction.
DS201905-1035
2019
Greaux, S.Greaux, S., Yamada, A.Density variations of Cr-rich garnets in the upper mantle inferred from the elasticity of uvarovite garnet.Comptes Rendus Geoscience, in press available 9p.Mantlegarnets

Abstract: The thermoelastic parameters of Ca3Cr2Si3O12 uvarovite garnet were examined in situ at high pressure up to 13 GPa and high temperature up to 1100 K by synchrotron radiation energy-dispersive X-ray diffraction within a 6-6-type multi-anvil press apparatus. A least-square fitting of room T data to a third-order Birch-Murnaghan (BM3) EoS yielded K0 = 164.2 ± 0.7 GPa, V0 = 1735.9 ± 0.3 Å3 (K’0 fixed to 4.0). P-V-T data were fitted simultaneously by a modified HT-BM3 EoS, which gave the isothermal bulk modulus K0 = 163.6 ± 2.6 GPa, K’0 = 4.1 ± 0.5, its temperature derivative (?K0,T/?T)P = -0.014 ± 0.002 GPa K-1, and the thermal expansion coefficients a0 = 2.32 ± 0.13 ×10-5 K-1 and b0 = 2.13 ± 2.18 ×10-9 K-2 (K’0 fixed to 4.0). Our results showed that the Cr3+ enrichment in natural systems likely increases the density of ugrandite garnets, resulting in a substantial increase of mantle garnet densities in regions where Cr-rich spinel releases chromium through a metasomatic reaction.
DS201908-1788
2019
Greaux, S.Liu, Z., Greaux, S., Cai, N., Siersch, N., Boffa Ballaran, T., Irifune, T., Frost, D.J.Influence of aluminum on the elasticity of majorite pyrope garnets.American Mineralogist, Vol. 104, pp. 929-935.Mantlegarnets

Abstract: The effect of aluminum (Al) on the elasticity of majorite-pyrope garnets was investigated by means of ultrasonic interferometry measurements on well-fabricated polycrystalline specimens. Both velocities and elastic moduli increase almost linearly with increasing Al content within analytical uncertainty. No significant variation of the velocities and elastic moduli is observed across the tetragonal-to-cubic phase transition at majorite with the pyrope content up to 26 mol% along the majorite-pyrope system. The elasticity variation of majorite-pyrope garnets is largely dominated by the Al content, while the phase transition as a result of cation ordering/disordering of Mg and Si via substitution of Al on octahedral sites cannot significantly affect elastic properties. Seismic velocity variations of a garnet-bearing mantle transition zone are therefore dominated by garnet composition (e.g., Al, Fe, Ca, and Na) rather than the tetragonal-to-cubic phase transition because of cation ordering/disordering.
DS201808-1748
2018
Greaves, J.S.Greaves, J.S., Scaife, A.M.M., Frayer, D.T., Green, D.A., Mason, B.S., Smith, A.M.S.Anomalous microwave emission from spinning nanodiamonds around stars.Nature Astronomy, doi.org/10.1038/s41550-018-0495-zGlobalnanodiamonds

Abstract: Several interstellar environments produce 'anomalous microwave emission', with brightness-peaks at tens-of-gigahertz frequencies. The emission's origins are uncertain - rapidly-spinning nano-particles could emit electric-dipole radiation, but polycyclic aromatic hydrocarbons proposed as the carrier are now found not to correlate with Galactic signals. The difficulty is to identify co-spatial sources over long lines of sight. Here we identify anomalous microwave emission in three proto-planetary discs. These are the only known systems that host hydrogenated nano-diamonds, in contrast to very common detection of polycyclic aromatic hydrocarbons. Spectroscopy locates the nano-diamonds close to the host-stars, at physically-constrained temperatures. Developing disc models, we reproduce the emission with diamonds 0.75-1.1 nanometres in radius, holding less than or equal to 1-2 per cent of the carbon budget. The microwave-emission:stellar-luminosity ratios are approximately constant, allowing nano-diamonds to be ubiquitous but emitting below detection thresholds in many star-systems. This can unify the findings with similar-sized diamonds found within solar system meteorites. As nano-diamond spectral absorption is seen in interstellar sightlines, these particles are also a candidate for generating galaxy-scale anomalous microwave emission.
DS1989-0534
1989
Greb, S.F.Greb, S.F.Structural controls on the formation of the sub-Absaroka unconformity In the U.S. Eastern interior basinGeology, Vol. 17, No. 10, October pp. 889-892KentuckyMidcontinent -structure, tectonics, Reelfoot rift
DS200512-0987
2004
GrebenshchikovaSimakov, S.K., Kalmykov, A.E., Sorokin, L.M., Novikov, Drozdova, Yagovkina, GrebenshchikovaChaoite formation from carbon bearing fluid at low PT parameters.Doklady Earth Sciences, Vol. 399A, 9, Nov-Dec. pp. 1289-1290.Mineralogy - chaoite
DS200412-1826
2004
Grebenshchikova, E.Simakov, S., Kalmykov, A., Sorokin, L., Grebenshchikova, E.Chaoite synthesis at lower temperatures and pressures.Lithos, ABSTRACTS only, Vol. 73, p. S102. abstractTechnologyDiamond like carbon phase
DS201710-2229
2017
Greber, N.Greber, N.Plate tectonics started at least 3.5 billion years ago.Science News, Sept. 21, 1p.Mantletitanium, Plate Tectonics

Abstract: Plate tectonics may have gotten a pretty early start in Earth’s history. Most estimates put the onset of when the large plates that make up the planet’s outer crust began shifting at around 3 billion years ago. But a new study in the Sept. 22 Science that analyzes titanium in continental rocks asserts that plate tectonics began 500 million years earlier. Nicolas Greber, now at the University of Geneva, and colleagues suggest that previous studies got it wrong because researchers relied on chemical analyses of silicon dioxide in shales, sedimentary rocks that bear the detritus of a variety of continental rocks. These rocks’ silicon dioxide composition can give researchers an idea of when continental rocks began to diverge in makeup from oceanic rocks as a result of plate tectonics.But weathering can wreak havoc on the chemical makeup of shales. To get around that problem, Greber’s team turned to a new tool: the ratios of two titanium isotopes, forms of the same element that have different masses. The proportion of titanium isotopes in the rocks is a useful stand-in for the difference in silicon dioxide concentration between continental and oceanic rocks, and isn’t so easily altered by weathering. Those data helped the team estimate that continental rocks — and therefore plate tectonics — were already going strong by 3.5 billion years ago.
DS201802-0252
2017
Grechanovskii, A.E.Marchenko, E.I., Eremin, N.N., Bychkov, A.Y., Grechanovskii, A.E.Ca and Mg perovskite phases in the Earth's mantle as a probable reservoir of Al: computer simulated evidence.Moscow University Geology Bulletin, Vol. 72, 5, pp. 299-304.Mantleperovskite

Abstract: Semi-empirical and quantum chemical studies of Al atom energy in CaSiO3 and MgSiO3 with the perovskite-type structure at pressures and temperatures of the Earth’s mantle are reported. The phase diagram for CaSiO3 is reproduced and refined. Probable mechanisms of Al incorporation in the structures studied are considered. According to the results of the calculations, Al is preferably incorporated into MgSiO3, rather than into CaSiO3. Evaluation of the isomorphic capacity of perovskite phases in relation to Al shows that the Al content in MgSiO3 may reach 2.4 mol % at 120 GPa and 2400 K. CaSiO3 cannot be a source of Al atoms in the Earth’s mantle.
DS1997-0441
1997
Grecoe, T.Grecoe, T.Warming signals in the Mackenzie Basin.... climate hot spotCan. Geographic, Vol. 117, No. 6, Nov-Dec . pp. 36-44Northwest TerritoriesGeomorphology, Mackenzie Basin
DS1996-0561
1996
Grecula, P.Grecula, P.Mineral deposits of the Slovak ore MountainsSlovak Geological Survey, Vol. 1, 900p. approx. $ 65.00 United StatesGlobalGeology, metallogeny, mineralization, Table of contents
DS200812-0504
2008
Gree, D.H.Irving, A.J., Gree, D.H.Phase relationships of hydrous alkalic magmas at high pressures: production of nepheline hawaiitic to mugearitic liquids by amphibole dominated fractionalJournal of Petrology, Vol. 49, 4, pp. 741-756.MantleNephelinite
DS1960-0953
1968
Greef, G.J.Greef, G.J.Fracture Systems and the Kimberlite Intrusions of Griqualand West.Stellenbosch: Msc. Thesis, University Stellenbosch, South AfricaTectonics, Lineament Analyses
DS1981-0186
1981
Greeman, T.K.Greeman, T.K.Lineaments and Fracture Traces, Jennings County and Jefferson Proving Ground Indiana.United States Geological Survey (USGS) OPEN FILE., No. 81-1120.GlobalMid-continent, Tectonic
DS1992-0710
1992
GreenHinze, W.J., Allen, D.J., Fox, A.J., Sunwood, D., Woelk, T., GreenGeophysical investigations and crustal of the North American Midcontinent rift systemTectonophysics, Vol. 213, No. 1-2, special issue, pp. 17-32MidcontinentTectonics, Geophysics
DS1992-0744
1992
GreenHutchinson, D.R., Lee, M.W., Behrendt, J., Cannon, W.F., GreenVariations in the reflectivity of the Moho transition zone beneath The midcontinent Rift System of North America. Results from true amplitude GlimpcedataJournal of Geophysical Research, Vol. 97, No. B4, April 10, pp. 4721-4738MidcontinentGeophysics -seismics, Tectonics
DS2001-0737
2001
GreenMateev, S., O'Neill, H. St., Ballhaus, Taylor, GreenEffect of silica activity on OH IR spectra of olivine: implications for low aSiO2 mantle Metasomatism..Journal of Petrology, Vol. 42, No. 4, Apr. pp. 721-30.MantleMetasomatism - silica
DS2002-0484
2002
GreenFriberg, M., Juhlin, Beckolmen, Petrov, GreenPaleozoic tectonic evolution of the Middle Urals in the light of ESRU seismic experiment.Journal of the Geological Society of London, Vol.159,3,pp.295-306., Vol.159,3,pp.295-306.Russia, UralsTectonics
DS2002-0485
2002
GreenFriberg, M., Juhlin, Beckolmen, Petrov, GreenPaleozoic tectonic evolution of the Middle Urals in the light of ESRU seismic experiment.Journal of the Geological Society of London, Vol.159,3,pp.295-306., Vol.159,3,pp.295-306.Russia, UralsTectonics
DS1987-0042
1987
Green, A.Behrendt, J.C., Green, A., Cannon, W.F.Crustal attentuation and associated basalt flow extrusion in the Keweenawanrift, Lake Superior from deep seismic reflectionprofilesGeological Society of America, Vol. 19, No. 7 annual meeting abstracts, p. 585. abstraGlobalTectonics
DS1989-0208
1989
Green, A.Cannon, W.F., Nicholson, S.W., Green, A.Tectonic and magmatic development of the Midcontinentrift: a synthesis of new seismic ,chemical and isotopic dataUnited Stated Geological Survey (USGS) Circular 1035, Fifth Annual V.E. McKelvey Forum, held Reno, pp. 7-8. Abstract onlyMidcontinent, Kansas, Michigan, Lake Superior regionTectonics, rift model
DS1989-1441
1989
Green, A.Spencer, C., Green, A., Morel-a-l'Huissier, P.The extension of the Grenville basement beneath the northern Appalachians:results from the Quebec-Maine seismic reflection and refraction surveysTectonics, Vol. 8, No. 4, August pp. 677-696GlobalGeophysics-Seismics, Tectonics
DS1993-0930
1993
Green, A.Lucas, S.B., Green, A., et al.Deep seismic profile across a Proterozoic collision zone: surprises atdepthNature, Vol. 363, No. 6427, May 27, pp. 339-341GlobalGeophysics -seismics, Tectonics
DS1994-1033
1994
Green, A.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
DS1990-1064
1990
Green, A. G.Morel-a-l'hussier, P., Green, A. G., Jones, A.G., Latham, T.The crust beneath the intracratonic Williston Basin from geophysical datain: Pinet, B., Bois, C. editors The potential of deep seismic profiling for, pp. 141-160SaskatchewanGeophysics, Williston Basin
DS1980-0146
1980
Green, A.G.Green, A.G., Stephenson, O.G.Cooperative Seismic Surveys Across the Superior- Churchill Boundary Zone in Southern Canada.Canadian Journal of Earth Sciences, Vol. 17, PP. 617-632.GlobalMid-continent, Geophysics
DS1983-0261
1983
Green, A.G.Green, A.G., Clowes, R.M.Deep Geology from Seismic Reflection Studies in CanadaFirst Break, Vol. 1, No. 7, PP. 24-33.Canada, Manitoba, OntarioGeophysics
DS1985-0246
1985
Green, A.G.Green, A.G., et al.Evolution of Proterozoic Terrains Beneath the Williston BasinGeology, Vol. 13, pp. 624-8.SaskatchewanBasin, Craton
DS1985-0247
1985
Green, A.G.Green, 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
DS1987-0490
1987
Green, A.G.Morel -A-Lhuissier, P., Green, A.G., Pike, C.J.Crustal refraction surveys across the Trans Hudson orogen/Williston Basin of South Central CanadaJournal of Geophysical Research, Vol. 92, No. B7, June 10, pp. 6403-6420CanadaSaskatchewan, Geophysics
DS1988-0048
1988
Green, A.G.Behrendt, J.C., Green, A.G., Cannon, W.F., Hutchinson, D.R., LeeCrustal structure of the Midcontinent rift system: results from GLIMPCE deep seismic reflection profilesGeology, Vol. 16, No. 1, January pp. 81-85GlobalTectonics, GLIMPCE.
DS1989-0207
1989
Green, A.G.Cannon, W.F., Green, A.G., Hutchinson, D.R., Myung Lee, MilkereitThe North American Midcontinent rift beneath Lake superior from GLIMPCE seismic reflection profilingTectonics, Vol. 8, No. 2, April pp. 305-332MidcontinentGeophysics, Glimpce
DS1989-0209
1989
Green, A.G.Cannon, W.F., Schulz, K.J., Hinze, W.J., Green, A.G.Precambrian terranes beneath northern Lake Michigan defined by seismic and gravity analysis35th. Annual Institute On Lake Superior Geology, Proceedings And, pp. 14-15MichiganMidcontinent, Seismics, Geophysics, Tect
DS1989-0535
1989
Green, A.G.Green, A.G., Cook, F.A., Milkereit, B.Lithoprobe seismic reflection profiles from the south- eastern CanadianCordilleraG.s.c. Open File, No. 2130, 13p. 12 sheets $ 27.00CordilleraGeophysics -seismics, Lithoprobe
DS1989-0536
1989
Green, A.G.Green, A.G., Milkereit, B., Davidson, A., Percival, J.A., ParrishReflection seismic profiling of the Kapuskasing structural zone, SOURCE[ Geological Association of Canada (GAC) Annual Meeting Program AbstractsGeological Society of Canada (GSC) Forum 1989, P. 11. abstractOntarioMidcontinent, Kapuskasing structure
DS1989-0537
1989
Green, A.G.Green, A.G., Milkereit, B., Percival, J.A., Kurtz, R.D., BroomeIntegrated geophysical lithoprobe studies of the Kapuskasing structureGeological Society of Canada (GSC) Forum 1989, P. 11. abstractOntarioGeophysics, Kapuskasing
DS1989-0903
1989
Green, A.G.Ludden, J.N., Hubert, C., Mayrand, L.J., Milkereit, B., Green, A.G.Results from the lithoprobe Abitibi projectGeological Society of Canada (GSC) Forum 1989, P. 17 abstractOntarioGeophysics-seismics
DS1989-1022
1989
Green, A.G.Milkereit, B., Green, A.G., Cook, F.A., West, G.F.Lithoprobe seismic profiles across the Kapuskasingstructure, northernOntarioG.s.c. Open File, No. 2131, 16p. 21 sheets $ 30.50Ontario, MidcontinentGeophysics, Lithoprobe, Kapuskasing structure
DS1989-1197
1989
Green, A.G.Percival, J.A., Green, A.G.Lithoprobe studies of the Kapuskasing uplift: an exposed crustal crosssectionGeological Society of Canada (GSC) Forum 1989, P. 19 abstractOntarioMidcontinent
DS1989-1198
1989
Green, A.G.Percival, J.A., Green, A.G., Milkereit, B., Cook, F.A., Geis, W.Seismic reflection profiles across deep continental crust exposed in the Kapuskasing uplift structureNature, Vol. 342, No. 6248, November 23, pp. 416-419OntarioGeophysics -seismic, Kapuskasing rift zone
DS1989-1605
1989
Green, A.G.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
DS1990-0271
1990
Green, A.G.Cannon, W.F., Phillips, J.D., Green, A.G., Morel-a l'Hussier, P.Great Lakes segment of the Canada -U.S. border transectGeological Society of America (GSA) Annual Meeting, Abstracts, Vol. 22, No. 7, p. A191GlobalGeochronology, Crust
DS1990-0527
1990
Green, A.G.Geis, W.T., Cook, F.A., Green, A.G., Milkereit, B., Percival, J.A.Thin thrust sheet formation of the Kapuskasing structural zone revealed bylithoprobe seismic reflection dataGeology, Vol. 18, No. 6, June pp. 513-516OntarioGeophysics -Seismics, Kapuskasing Zone
DS1990-0528
1990
Green, A.G.Geis, W.T., Cook, F.A., Green, A.G., Milkereit, B., Percival, J.A.Thin thrust sheet formation of the Kapuskasing structural zone revealed by lithoprobe seismic reflection dataGeology, Vol. 18, No. 6, June pp. 513-516OntarioGeophysics, Kapuskasing Zone
DS1990-0596
1990
Green, A.G.Green, A.G., et al.Origin of deep crustal reflections: seismic profiling across high grade metamorphic terranes in Canada.Tectonophysics, Vol. 173, pp. 627-38.Ontario, British ColumbiaGeophysics - seismics, Lithoprobe
DS1990-0597
1990
Green, A.G.Green, A.G., Milkereit, B.Diverse seismic reflection images from the Canadian shieldTerra, Abstracts of Deep Seismic reflection profiling of the Continental, Vol. 2, December abstracts p. 163OntarioKapuskasing, Tectonics
DS1990-0598
1990
Green, A.G.Green, A.G., Milkereit, B., Mayrand, L.J., Ludden, J.N., Hubert, C.Deep structure of an Archean greenstone terraneNature, Vol. 344, No. 6164, March 22, pp. 327-329QuebecGreenstone belt, Tectonics/structure
DS1990-1043
1990
Green, A.G.Milkereit, B., Green, A.G., Lee, M.W., Agena, W.F., Spencer, C.Pre- and post stack migration of Glimpce reflection dataTectonophysics, Vol. 174, No. 1/2, March 1, pp. 1-14Ontario, MichiganGeophysics -Seismics, Glimpce
DS1991-0217
1991
Green, A.G.Cannon, W.F., Lee, M.Y.W., Hinze, W.J., Schulz, K.J., Green, A.G.Deep crustal structure of the Precambrian basement beneath northern LakeMichigan, midcontinent North AmericaGeology, Vol. 19, No. 3, March pp. 207-210MichiganTectonics, Structure -crustal
DS1991-0969
1991
Green, A.G.Leclair, A.D., Percival, J.A., Milkereit, B., Green, A.G., West G.F.Seismic reflection profiles across major faults of the central KapuskasingUpliftGeological Association of Canada (GAC)/Mineralogical Association of Canada/Society Economic, Vol. 16, Abstract program p. A73OntarioTectonics, Geophysics -seismics
DS1991-1154
1991
Green, A.G.Milkereit, B., Percival, J.A., White, D., Green, A.G., SalisburySeismic reflectors in high grade metamorphic rocks of the Kapuskasinguplift: results of preliminary drill site surveysGeodynamics, Vol. 22, pp. 39-45OntarioKapuskasing uplift, Geophysics -seismics
DS1992-1063
1992
Green, A.G.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
DS1994-1010
1994
Green, A.G.Leclair, A.D., Percival, J.A., Green, A.G., et al.Seismic reflection profiles across the central Kapuskasing upliftCanadian Journal of Earth Sciences, Vol. 31, No. 7, July pp. 1016-1026.OntarioGeophysics -seismics, Tectonics -Kapuskasing uplift
DS1994-1193
1994
Green, A.G.Milkereit, B., White, D.J., Green, A.G.Towards an improved seismic technique for crustal structures: the Lithoprobe Sudbury experimentGeophy. Res. Letters, Vol. 21, No. 10, May 15, pp. 927-930OntarioLithoprobe, Sudbury Structure
DS2000-0302
2000
Green, A.G.Friberg, M., Juhlin, C., Green, A.G., Hortsmeyer, RothEuroprobe seismic reflection profiling across the eastern middle Urals and West Siberian Basin.Terra Nova, Vol. 12, No. 6, Dec.pp. 252-7.Urals, Russia, SiberiaGeophysics - seismics
DS1860-0592
1888
Green, A.H.Green, A.H.A Contribution to the Geology and Physical Geography of The cape Colony.Quarterly Journal of Geological Society (London), Vol. 44, PP. 239-241.Africa, South Africa, Cape ProvinceRegional Geology
DS200512-0751
2004
Green, B.Moses, T.M., Johnson, M.L., Green, B., Blodgett, Cino, Geurts, Gilbertson, hemphill, King, Kornylak, ReinitzA foundation for grading the overall cut quality of round brilliant cut diamonds.Gems & Gemology, Vol. 40, 3, Fall, pp. 202-228.Diamond cutting
DS202004-0497
2020
Green, B.Ashfold, M.N.R., Goss, J.P., Green, B., May, P.W., Newton, M.E., Peaker, C.V.Nitrogen in diamond.Chemical Reviews, Vol. 120, 4, 10.1021/ acs.chemrev.9b00578 50p. PdfGlobalHPHT, CVD, synthetics

Abstract: Nitrogen is ubiquitous in both natural and laboratory-grown diamond, but the number and nature of the nitrogen-containing defects can have a profound effect on the diamond material and its properties. An ever-growing fraction of the supply of diamond appearing on the world market is now lab-grown. Here, we survey recent progress in two complementary diamond synthesis methods: high pressure high temperature (HPHT) growth and chemical vapor deposition (CVD), how each is allowing ever more precise control of nitrogen incorporation in the resulting diamond, and how the diamond produced by either method can be further processed (e.g., by implantation or annealing) to achieve a particular outcome or property. The burgeoning availability of diamond samples grown under well-defined conditions has also enabled huge advances in the characterization and understanding of nitrogen-containing defects in diamond alone and in association with vacancies, hydrogen, and transition metal atoms. Among these, the negatively charged nitrogen-vacancy (NV-) defect in diamond is attracting particular current interest in account of the many new and exciting opportunities it offers for, for example, quantum technologies, nanoscale magnetometry, and biosensing.
DS202004-0508
2020
Green, B.Diggle, P.L., Dhaenens-Johannsson, U., Green, B., Welbourn, C.M., Tran Thi, T.N., Wang, W., Newton, M.E. Decoration of growth sector boundaries with single nitrogen vacancy centres in as-grown single crystal HPHT synthetic diamond.Diamond and Related Materials, arxiv.org 21p. Globalsynthetics

Abstract: Large (> 100 mm3), relatively pure (type II) and low birefringence single crystal diamond can be produced by high pressure high temperature (HPHT) synthesis. In this study we examine a HPHT sample of good crystalline perfection, containing less than 1 ppb (part per billion carbon atoms) of boron impurity atoms in the {001} growth sector and only tens of ppb of nitrogen impurity atoms. It is shown that the boundaries between {111} and {113} growth sectors are decorated by negatively charged nitrogen vacancy centres (NV-): no decoration is observed at any other type of growth sector interface. This decoration can be used to calculated the relative {111} and {113} growth rates. The bulk (001) sector contains concentrations of luminescent point defects (excited with 488 and 532 nm wavelengths) below 1011 cm-3 (10-3 ppb). We observe the negatively charged silicon-vacancy (SiV-) defect in the bulk {111} sectors along with a zero phonon line emission associated with a nickel defect at 884 nm (1.40 eV). No preferential orientation is seen for either NV- or SiV- defects, but the nickel related defect is oriented with its trigonal axis along the <111> sector growth direction. Since the NV- defect is expected to readily re-orientate at HPHT diamond growth temperatures, no preferential orientation is expected for this defect but the lack of preferential orientation of SiV- in {111} sectors is not explained.
DS201901-0095
2018
Green, B.L.Zhao, J., Breeze, B.G., Green, B.L., Diggle, P.L., Newton, M.E.Fluorescence, phosphoresence, thermoluminesence, and charge tranfer in synthetic diamond.Gems & Gemology, Sixth International Gemological Symposium Vol. 54, 3, 1p. Abstract p. 266.GlobalFluoresence

Abstract: Photoluminescence (PL) and phosphorescence underpin many of the discrimination techniques used to separate natural from synthetic diamond. PL is at the heart of many new quantum technologies based on color centers in lab-grown diamonds. In HPHT synthetic diamond, the phosphorescence observed is explained in terms of donor-acceptor pair recombination. The thermal activation of electrons to neutral boron acceptors shows that boron plays a key role in the phosphorescence process. However, there are a number of things we struggle to explain. For example, the phosphorescence peak positions are not fully explained, and there is no conclusive link between the emission and charge transfer involving the substitutional nitrogen donor. Secondly, the origin of the phosphorescence observed in some synthetic diamond samples grown by the CVD process is unclear. Although we now have evidence for unintentional boron impurity incorporation at stop-start growth boundaries in some CVD syn- thetic samples, it is possible that some of the observed phosphorescence does not involve boron impurities. In this paper we report on the results of combined fluorescence, phosphorescence, thermoluminescence, and quantitative charge transfer investigations undertaken on both HPHT and CVD synthetic diamond, with the objective of identifying which defects are involved in the fluorescence and phosphorescence processes.
DS201809-2030
2018
Green, C.Green, C.The pursuit of colour. Part 1. The rise to prominence of fancy coloured diamonds post 1970.The Australian Gemmologist, Vol. 26, 9-10, pp. 226-239.Globaldiamond - colour
DS201911-2507
2019
Green, C.Akam, C., Simandl, G.J., Lett, R., Paradis, S., Hoshino, M., Kon, Y., Araoka, D., Green, C., Kodama, S., Takagi, T., Chaudhry, M.Comparison of methods for the geochemical determination of rare earth elements: Rock Canyon Creek REE-F-Ba deposit case study, SE British Columbia, Canada.Geochemistry: Exploration, Environment, Analysis, Vol. 19, pp. 414-430.Canada, British Columbiageochemistry

Abstract: Using Rock Canyon Creek REE-F-Ba deposit as an example, we demonstrate the need for verifying inherited geochemical data. Inherited La, Ce, Nd, and Sm data obtained by pressed pellet XRF, and La and Y data obtained by aqua regia digestion ICP-AES for 300 drill-core samples analysed in 2009 were compared to sample subsets reanalysed using lithium metaborate-tetraborate (LMB) fusion ICP-MS, Na2O2 fusion ICP-MS, and LMB fusion-XRF. We determine that LMB ICP-MS and Na2O2 ICP-MS accurately determined REE concentrations in SY-2 and SY-4, and provided precision within 10%. Fusion-XRF was precise for La and Nd at concentrations exceeding ten times the lower detection limit; however, accuracy was not established because REE concentrations in SY-4 were below the lower detection limit. Analysis of the sample subset revealed substantial discrepancies for Ce concentrations determined by pressed pellet XRF in comparison to other methods due to Ba interference. Samarium, present in lower concentrations than other REE compared, was underestimated by XRF methods relative to ICP-MS methods. This may be due to Sm concentrations approaching the lower detection limits of XRF methods, elemental interference, or inadequate background corrections. Aqua regia dissolution ICP-AES results, reporting for La and Y, are underestimated relative to other methods.
DS1960-0552
1965
Green, D.Green, D.Gemstones and Ornamental StonesGeological Survey Bechuanaland Protectorate, (UNPUBL.)BotswanaDiamond
DS1960-0674
1966
Green, D.Green, D.The Karroo System in BechuanalandBotswana Geological Survey, Bulletin. No. 2, 74P.BotswanaStratigraphy
DS1980-0147
1980
Green, D.Green, D., Crockett, R.N., Jones, M.T.Tectonic Control of Karroo Sedimentation in Mid-eastern Botswana.Geological Society of South Africa Transactions, Vol. 83, PP. 213-219.BotswanaRegional Tectonics
DS201808-1748
2018
Green, D.A.Greaves, J.S., Scaife, A.M.M., Frayer, D.T., Green, D.A., Mason, B.S., Smith, A.M.S.Anomalous microwave emission from spinning nanodiamonds around stars.Nature Astronomy, doi.org/10.1038/s41550-018-0495-zGlobalnanodiamonds

Abstract: Several interstellar environments produce 'anomalous microwave emission', with brightness-peaks at tens-of-gigahertz frequencies. The emission's origins are uncertain - rapidly-spinning nano-particles could emit electric-dipole radiation, but polycyclic aromatic hydrocarbons proposed as the carrier are now found not to correlate with Galactic signals. The difficulty is to identify co-spatial sources over long lines of sight. Here we identify anomalous microwave emission in three proto-planetary discs. These are the only known systems that host hydrogenated nano-diamonds, in contrast to very common detection of polycyclic aromatic hydrocarbons. Spectroscopy locates the nano-diamonds close to the host-stars, at physically-constrained temperatures. Developing disc models, we reproduce the emission with diamonds 0.75-1.1 nanometres in radius, holding less than or equal to 1-2 per cent of the carbon budget. The microwave-emission:stellar-luminosity ratios are approximately constant, allowing nano-diamonds to be ubiquitous but emitting below detection thresholds in many star-systems. This can unify the findings with similar-sized diamonds found within solar system meteorites. As nano-diamond spectral absorption is seen in interstellar sightlines, these particles are also a candidate for generating galaxy-scale anomalous microwave emission.
DS1960-0479
1964
Green, D.H.Mcdougall, I., Green, D.H.Excess Radiogenic Argon in Pyroxenes and Isotopic Ages on Minerals from Norwegian Eclogites.Norske Geol. Tidsskr., Vol. 44, PP. 183-196.Norway, ScandinaviaIsotope
DS1960-0735
1966
Green, D.H.Ringwood, A.E., Green, D.H.An Experimental Investigation of the Gabbro Eclogite Transformation and Some Geophysical Implications.Tectonophysics, Vol. 3, No. 5, PP. 383-427.South AfricaGeophysics, Eclogites
DS1960-1114
1969
Green, D.H.Green, D.H.Mineralogy of Norwegian EclogitesContrib. To Physico-chemical Petrology, (korhinskii Volume P, Vol. 1, PP. 37-44.Norway, ScandinaviaEclogite, Ultramafic And Related Rocks
DS1970-0519
1972
Green, D.H.Green, D.H.A Comparison of Recent Experimental Dat a on the Gabbro-garnet Granulite-eclogite Transition.Journal of GEOLOGY, Vol. 80, PP. 277-288.GlobalEclogite, Kimberlite
DS1975-0089
1975
Green, D.H.Green, D.H., Sobolev, N.V.Coexisting Garnets and Ilmenites Synthesized at High Pressure pressures from Pyrolite and Olivine Basanite and Their Significance for Kimberlitic Assemblages.Contributions to Mineralogy and Petrology, Vol. 50, PP. 217-229.South AfricaWesselton, Microprobe Analyses
DS1975-0296
1976
Green, D.H.Irving, A.J., Green, D.H.Geochemistry and Petrogenesis of the Newer Basalts of Victoria and South Australia.Geological Society AUST. Journal, Vol. 23, PP. 45-66.AustraliaKimberlite
DS1975-0746
1978
Green, D.H.Frey, F.A., Green, D.H., Roy, S.D.Integrated Models of Basalt Petrogenesis: a Study of QuartzJournal of PETROLOGY, Vol. 19, PP. 463-513.Australia, New South Wales, VictoriaBasalt, Related Rocks
DS1975-1009
1979
Green, D.H.Ellis, D.J., Green, D.H.An Experimental Study of the Effect of Calcium upon Garnet Clinopyroxene Iron - Magnesium Exchange Equilibria.Contributions to Mineralogy and Petrology, Vol. 71, PP. 13-22.GlobalMineral Chemistry, Analyses, Eclogite
DS1982-0248
1982
Green, D.H.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
Green, D.H.Harley, S.L., Green, D.H.garnet-orthopy roxene Barometry for Granulites and PeridotiteNature., Vol. 300, No. 5894, Dec. 23RD., PP. 697-701.GlobalBlank
DS1982-0461
1982
Green, D.H.Nickel, K.G., Green, D.H.Ultramafic Xenoliths from Lake Bulletinen Merri and Mt. Leura, South East Australia, and Their Bearing on the Evolution of The Continental Upper Mantle.Proceedings of Third International Kimberlite Conference, TERRA COGNITA, ABSTRACT VOLUME., Vol. 2, No. 3, P. 230, (abstract.).AustraliaKimberlite, Chemistry
DS1984-0437
1984
Green, D.H.Kuehner, S.M., Green, D.H.Mafic Dikes from the Vestfold Hills, AntarcticaGeological Society of Australia., No. 12, ABSTRACT VOLUME PP. 314-316.GlobalGeochronology, Petrography
DS1984-0550
1984
Green, D.H.Nickel, K.G., Green, D.H.The Nature of the Upper Most Mantle Beneath Victoria Australia As Deduced from Ultramafic Xenoliths.Proceedings of Third International Kimberlite Conference, Vol. 2, PP. 161-178.Australia, Lake Bulletinenmerri, Mt. LeuraWehrlite, Mineral Chemistry, Microprobe Analyses
DS1985-0491
1985
Green, D.H.Nickel, K.G., Green, D.H.Empirical Geothermobarometry for Garnet Peridotites and Implications for the Nature of the Lithosphere, Kimberlites Anddiamonds.Earth Planet. Sci. Letters, Vol. 73, PP. 158-170.South Africa, Africa, Australia, CanadaModels, Genesis, Experimental, Geobarometry
DS1986-0249
1986
Green, D.H.Foley, S.F., Taylor, W.R., Green, D.H.The role of fluorine and oxygen fugacity in the genesis ofultrapotassicrocksContributions to Mineralogy and Petrology, Vol. 94, No. 2, pp. 183-192Wyoming, Spain, Arkansas, Utah, Germany, CaliforniaLamproite
DS1986-0301
1986
Green, D.H.Green, D.H., Falloon, T.J., Brey, G.P., Nickel, K.G.Peridotite melting to GPa and genesis of primary mantle derived magmasProceedings of the Fourth International Kimberlite Conference, Held Perth, Australia, No. 16, pp. 181-183GlobalMantle
DS1986-0561
1986
Green, D.H.Mengel, K., Green, D.H.Experimental study of amphibole and phlogopite stability in metasomatized peridoite under water saturated and water undersaturated conditionsProceedings of the Fourth International Kimberlite Conference, Held Perth, Australia, No. 16, pp. 193-195GlobalExperimental petrology
DS1986-0799
1986
Green, D.H.Taylor, W.R., Green, D.H.The role of reduced C-O-H fluids in mantle partial melting #1Proceedings of the Fourth International Kimberlite Conference, Held, No. 16, pp. 211-213GlobalExperimental petrology
DS1987-0169
1987
Green, D.H.Duncan, R.A., Green, D.H.The geochemistry and petrology of an alkaline lamprophyre sheet intrusion complex on Maio Cape Verde RepublicContributions to Mineralogy and Petrology, Vol. 96, pp. 326-342GlobalMantle genesis, Peridotites
DS1987-0218
1987
Green, D.H.Foley, S.F., Venturello, G., Green, D.H., Toscani, L.The ultrapotassic rocks: characteristics, classification and constraints for petrogenetic modelsEarth Science Reviews, Vol.24, pp. 81-134GlobalClassification, Petrogenesis
DS1988-0266
1988
Green, D.H.Green, D.H., Wallace, M.E.Mantle metasomatism by ephemeral carbonatite meltsNature, Vol. 336, np. 6198, Dec. 1, pp. 459-462GlobalMantle, Carbonatite
DS1988-0687
1988
Green, D.H.Taylor, W.R., Green, D.H.Measurement oof reduced peridotite- C-O-H solidus And implications for redox melting of the mantleNature, Vol. 332, No. 6162, March 24, pp. 349-351GlobalBlank
DS1988-0746
1988
Green, D.H.Wallace, M.E., Green, D.H.An experimental determination of primary carbonatite magma compositionNature, Vol. 335, No. 6188, Sept. 22, pp. 343-346GlobalCarbonatite, Magma
DS1989-0307
1989
Green, D.H.Crawford, A.J., Falloon, T.J., Green, D.H.Classification, petrogenesis and tectonic setting of boninitesIn: Boninites, Editor A.J. Crawford, Unwin and Hyman, pp. 2-49GlobalBoninites, Classification
DS1989-0415
1989
Green, D.H.Falloon, T.J., Green, D.H.The solidus of carbonated, fertile peridotiteEarth and Planetary Science Letters, Vol. 94, No. 3/4 September pp. 364-370HawaiiPyrolite/peridotite, Experimental petrogenesis
DS1989-1005
1989
Green, D.H.Mengel, K., Green, D.H.Stability of amphibole and phlogopite in metasomatized peridotite underwater-saturated and water-undersaturated conditionsGeological Society of Australia Inc. Blackwell Scientific Publishing, Special, No. 14, Vol. 1, pp. 571-581GlobalMantle Metasomatism, Experimental petrology
DS1989-1485
1989
Green, D.H.Taylor, W.R., Green, D.H.The role of reduced C-O-H fluids in mantle partial melting #2Geological Society of Australia Inc. Blackwell Scientific Publishing, No. 14, Vol. 1, pp. 592-602GlobalMantle, Oxidation
DS1990-0160
1990
Green, D.H.Ballhaus, C., Berry, R.F., Green, D.H.Oxygen fugacity controls in the earth's upper mantleNature, Vol. 348, No. 6300, November 29, pp. 437-439GlobalMantle, Geochronology -oxygen
DS1990-0462
1990
Green, D.H.Falloon, T.J., Green, D.H.Solidus of carbonated fertile peridotite under fluid-saturatedconditionsGeology, Vol. 18, No. 3, March pp. 193-288GlobalGeochemistry, Peridotite
DS1990-0599
1990
Green, D.H.Green, D.H.Fluids in subduction zones: experimental constraintsGeological Society of Australia Abstracts, No. 25, No. A12.11 pp. 213-214. AbstractGlobalExperimental petrology, Magma genesis
DS1990-0600
1990
Green, D.H.Green, D.H.The role of oxidation-reduction and C-H-O fluids in determining melting conditions and magma compositions in the Upper MantleProceedings Indian Academy of Sciences, Vol. 99, No. 1, March pp. 153-GlobalMantle, Experimental petrology
DS1990-0601
1990
Green, D.H.Green, D.H., Taylor, W.R., Foley, S.The earth's upper mantle as a source for volatilesUniversity of Western Australia Publishing, Proceedings on Conference on stable isotopes and, No. 23, pp. 17-34GlobalMantle, Geochemistry
DS1990-1128
1990
Green, D.H.Odling, N.W.A., Mernagh, T., Green, D.H.high pressure, high temperature fluid inclusion synthesis: analysis andimplicationsTerra, Abstracts of Experimental mineralogy, petrology and, Vol. 2, December abstracts p. 89GlobalMantle, Xenoliths
DS1991-0065
1991
Green, D.H.Ballhaus, C., Berry, R.F., Green, D.H.high pressure experimental calibration of the olivine ortho pyroxene spinel oxygen geobarometer-implications for the oxidation state of the upper mantleContributions to Mineralogy and Petrology, Vol. 107, No. 1, pp. 27-40GlobalMantle, Geobarometry
DS1991-0790
1991
Green, D.H.Jenner, G., Green, D.H.Petrogenesis of type 3 low Calcium boninitesEos Transactions, Vol. 72, No. 44, October 29, abstract p. 519GlobalBoninites, Petrology
DS1991-1078
1991
Green, D.H.Mattey, D.P., Taylor, W.R., Green, D.H.Carbon isotope fractionation between CO2 vapour and silicate melts at 5-30KBARSTerra, Abstracts of Experimental mineralogy, petrology and, Vol. 2, December abstracts p. 88GlobalExperimental petrology, Carbonatite
DS1991-1254
1991
Green, D.H.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
DS1991-1682
1991
Green, D.H.Sweeney, R.J., Falloon, T.J., Green, D.H., Tatsumi, Y.The mantle origin of Karoo picritesEarth and Planetary Science Letters, Vol. 107, No. 2, November pp. 256-271South AfricaPicrites, Mantle
DS1991-1702
1991
Green, D.H.Taylor, W.R., Green, D.H.Mineral chem. of silicate and oxide phases from fertile peridotite equilibrated with a C-O-H fluid phase- a low fO2 dat a set- evaluation of mineralbarometers, therM.Proceedings of Fifth International Kimberlite Conference held Araxa June 1991, Servico Geologico do Brasil (CPRM) Special, pp. 417-419GlobalExperimental petrology, Geobarometry
DS1991-1825
1991
Green, D.H.Wallace, M.E., Green, D.H.The effect of bulk rock composition on the stability of amphibole in The upper mantle- implications for solidus positions and mantle MetasomatismMineral. Petrol, Vol. 44, No. 1-2, pp. 1-19GlobalMantle, Geochemistry
DS1991-1907
1991
Green, D.H.Yaxley, G.M., Crawford, A.J., Green, D.H.Evidence for carbonatite metasomatism in spinel peridotite xenoliths from western Victoria, AustraliaEarth and Planetary Science Letters, Vol. 107, No. 2, November pp. 305-317AustraliaCarbonatite, Xenoliths
DS1992-0603
1992
Green, D.H.Green, D.H.The earth's lithosphere and asthenosphere; concepts and constraints derived from petrology and high pressure experiments.The Australian Lithosphere, Geol. Society of Australia, Vol. 17, pp. 1-22.AustraliaCraton, Archean
DS1992-1506
1992
Green, D.H.Sweeney, R.J., Green, D.H., Sie, S.H.Trace and minor element partioning between garnet and amphibole and carbonatitic meltEarth and Planetary Science Letters, Vol. 113, No. 1-2, September pp. 1-14GlobalCarbonatite, Mineral chemistry
DS1992-1719
1992
Green, D.H.Yaxley, G., Green, D.H., Crawford, A.J.Carbonatite metasomatism: observations and implications11th. Australian Geol. Convention Held Ballarat University College, Jan., Listing of papers to be given attempting to get volAustraliaCarbonatite, Metasomatism
DS1993-0572
1993
Green, D.H.Green, D.H.The melting behaviour of the Earth's upper mantle and implications for mantle dynamics.Russian Geology and Geophysics, Vol. 34, No. 12, pp. 148-161.MantleGeodynamics, Melting
DS1994-0657
1994
Green, D.H.Green, D.H.Experimental definition of mantle melting and implications for mantledynamics.Mineralogical Magazine, Vol. 58A, pp. 350-351. AbstractMantleGeodynamics, Xenoliths
DS1994-1731
1994
Green, D.H.Sweeney, R.J., Falloon, T.J., Green, D.H.Experimental constraints on the possible mantle originCarbonatite volcanism, Ed. Bell, K., Keller, J., pp. 191-208.TanzaniaDeposit -Oldoinyo Lengai
DS1994-1962
1994
Green, D.H.Yaxley, G.M., Green, D.H.Experimental demonstration of refractory carbonate eclogite and siliceous melt in the subduction regime.Earth Planetary Science Letters, Vol. 128, No. 3-4, Dec. pp. 313-326.GlobalEclogite, Subduction
DS1994-1963
1994
Green, D.H.Yaxley, G.M., Green, D.H., Klapova, H.The refractory nature of carbonate during partial melting of eclogite:evidence from experiments.Mineralogical Magazine, Vol. 58A, pp. 9996-997. AbstractMantleEclogites, Carbonates
DS1996-0562
1996
Green, D.H.Green, D.H.Experimental constraints on kimberlite genesisAustralia Nat. University of Diamond Workshop July 29, 30., 10p.MantleMelting, phase relationships, Redox, lherzolite, harzburgite
DS1997-0332
1997
Green, D.H.Falloon, T.J., Green, D.H., O'Neill, H., Hibberson, W.Experimental tests of low degree peridotite partial melt compositions:implications for the nature ....Earth and Plan. Sci. Letters, Vol. 152, No. 1-4, pp. 149-162.GlobalPetrology - experimental, Andesitic melts, lherzolites
DS1997-1281
1997
Green, D.H.Yaxley, G.M., Green, D.H., Kamenetsky, V.Carbonatite metasomatism in the southeastern Australian lithosphere. #1Geological Association of Canada (GAC) Abstracts, AustraliaCarbonatite
DS1997-1282
1997
Green, D.H.Yaxley, G.M., Kamenets, V., Green, D.H., Falloon, T.J.Classes in mantle xenoliths from Western Victoria Australia, and their relevance to mantle processes.Earth Planetary Science Letters, Vol. 148, No. 3-4, May pp. 433-446.AustraliaXenoliths, Mantle
DS1998-1615
1998
Green, D.H.Yaxley, G.M., Green, D.H.Phase relations of carbonated eclogite under upper mantle PT condition simplications for carbonatite....7th International Kimberlite Conference Abstract, pp. 983-85.MantleExperimental petrology, Eclogites, carbonatite
DS1998-1616
1998
Green, D.H.Yaxley, G.M., Green, D.H., Kamenetsky, V.Carbonatite metasomatism in the southeastern Australian lithosphere. #2Journal of Petrology, Vol. 39, No. 11-12, Nov-Dec. pp. 1917-30.AustraliaCarbonatite, Metasomatism
DS1999-0202
1999
Green, D.H.Falloon, T.J., Green, D.H., Faul, U.H.Peridotitic melting at 1 and 1.5 GPa: an experimental evaluation of techniques using diamond aggregates...Journal of Petrology, Vol. 40, No. 9, Sept. pp. 1343-76.GlobalPetrology - experimental, Melting - near solidus melts, mineral mixes
DS1999-0508
1999
Green, D.H.Niida, K., Green, D.H.Stability and chemical composition of pargasitic amphibole Mid Ocean Ridge Basalt (MORB) pyrolite under upper mantle conditions.Contributions to Mineralogy and Petrology, Vol. 135, No. 1, pp. 18-40.MantleGeochemistry, Pyrolite - amphibole
DS2001-0407
2001
Green, D.H.Green, D.H., Falloon, T.J., Eggins, S.M., Yaxley, G.M.Primary magmas and mantle temperaturesEuropean Journal of Mineralogy, Vol. 13, No. 3, pp. 437-51.MantleMagmatism, Melting, subduction, slabs, hotspots
DS2001-0474
2001
Green, D.H.Hermann, J., Green, D.H.Experimental constraints on high pressure melting in subducted crustEarth and Planetary Science Letters, Vol. 188, No. 1, May 30, pp.149-68.Mantleultra high pressure (UHP), Subduction
DS2001-0844
2001
Green, D.H.Nutman, A.P., Green, D.H., Cook, C.A., Styles, M.T.Shrimp uranium-lead (U-Pb) zircon dating of the exhumation of the Lizard peridotite and its emplacement over crustal rockJour. Geol. Soc. Lond., Vol. 158, No. 5, pp. 809-20.United KingdomGeochronology, Peridotite - Lizard
DS200412-0713
2004
Green, D.H.Green, D.H., Schmidt, M.W., Hibberson, W.O.Island arc ankaramites: primitive melts from fluxed refractory lherzolitic mantle.Journal of Petrology, Vol. 45, 2, pp. 391-403.MantlePetrology
DS200412-1759
2004
Green, D.H.Schmidt, T., Green, D.H., Hibberson, W.O.Ultra calcic magmas generated from Ca depleted mantle: an experimental study on the origin of ankaramites.Journal of Petrology, Vol. 45, 3, pp. 531-554.MantleMagmatism, melt inclusions - not specific to diamonds
DS200512-0241
2005
Green, D.H.Doglioni, C., Green, D.H., Mongelli, F.On the shallow origin of hotspots and the westward drift of the lithosphere.Plates, Plumes, and Paradigms, pp. 735-750. ( total book 861p. $ 144.00)MantleGeophysics
DS200512-0363
2005
Green, D.H.Green, D.H., Falloon, T.J.Primary magmas at mid-ocean ridges, 'hotspots' and other intraplate settings: constraints on mantle potential temperatures.Plates, Plumes, and Paradigms, pp. 217-248. ( total book 861p. $ 144.00)MantleGeothermometry
DS200612-0493
2006
Green, D.H.Green, D.H.Why does the Earth have lithosphere of around 90 km thickness in oceanic and many continental intraplate settings?Geochimica et Cosmochimica Acta, Vol. 70, 18, p. 213, abstract only.MantleGeophysics - seismics, tectonics
DS200712-0303
2007
Green, D.H.Fallon, T.J., Danyushevsky, L.V., Ariskin, A., Green, D.H., Ford, C.E.The application of olivine geothermometry to infer crystallization temperatures of parental liquids; implications for the temperature of MORB magmas.Chemical Geology, Vol. 241, 3-4, pp. 207-233.MantleGeothermometry
DS200712-0910
2007
Green, D.H.Rosenthal, A., Yaxley, G.M., Green, D.H., Hermann, J., Spandler, C.S.Phase and melting relations of a residual garnet clinopyroxenite.Plates, Plumes, and Paradigms, 1p. abstract p. A851.MantleMelting
DS200712-1202
2007
Green, D.H.Yaxley, G.M., Spandler, C.S., Green, D.H., Rosenthal, A., Brey, G.P.The influence of minor elements on melting of eclogite in the mantle.Plates, Plumes, and Paradigms, 1p. abstract p. A1143.MantleMelting
DS200812-0429
2008
Green, D.H.Green, D.H., Hibberson, W.O., O'Neill, H.St.C.Clarification of the influence of water on mantle wedge melting.Goldschmidt Conference 2008, Abstract p.A325.MantleMelting
DS200812-0972
2008
Green, D.H.Rosenthal, A., Yaxley, G.M., Green, D.H., Hermann, J., Spandler, C.S.Melting of residual eclogites with variable proportions of quartz coesite.Goldschmidt Conference 2008, Abstract p.A806.TechnologyMagma genesis
DS200912-0838
2009
Green, D.H.Yaxley, G.M., Spandler, C.S., Sobolev, A.V., Rosenthal, A., Green, D.H.Melting and melt peridotite interactions in heterogeneous upper mantle sources of primitive volcanics.Goldschmidt Conference 2009, p. A1482 Abstract.MantleMelting
DS201012-0638
2010
Green, D.H.Rosenthal, A., Yaxley, G.M., Green, D.H., Hermann, J., Spandler, C.S., Kovacs, I., Mernagh, T.P.Phase and melting relations of a residual eclogite within an upwelling heterogeneous upper mantle.International Mineralogical Association meeting August Budapest, abstract p. 156.MantlePetrogenesis
DS201112-0199
2010
Green, D.H.Conceicao, R.V., Green, D.H., Lenz, C., Gervasconi, F., Drago, S.Derivation of potassic magmas by decompression melting of phlogopite+pargasite lherzolite.5th Brasilian Symposium on Diamond Geology, Nov. 6-12, abstract p. 74.MantleMetasomatism
DS201112-1040
2011
Green, D.H.Tian, W., Chen, B., Ireland, T.R., Green, D.H., Suzuki, K., Chu, Z.Petrology and geochemistry of dunites, chromitites and mineral inclusions from the Gaositai Alaskan type complex, North Chin a craton: mantle source charactersLithos, Vol. 127, 1-2, pp. 165-175.ChinaCarbonatite
DS201212-0379
2012
Green, D.H.Kovacs, I., Green, D.H., Rosenthal, A., Hermann, J., St.O'Neill, H., Hibberson, W.O., Udvardi, B.An experimental study of water in nominally anhydrous minerals in the upper mantle near the water saturated solidus.Journal of Petrology, Vol. 53, 10, pp. 2067-2093.MantleWater content
DS201212-0598
2012
Green, D.H.Rosenthal, A., Green, D.H., Kovacs, I., Hibberson, W.O., Yaxley, G.M., Brink, F.Experimental study of the role of water in the uppermost mantle.10th. International Kimberlite Conference Feb. 6-11, Bangalore India, AbstractMantleWater
DS201212-0599
2012
Green, D.H.Rosenthall, A., Yaxley, G.M., Green, D.H., Kovacs, I., Herman, J., Spandler, C.S., Mernagh, T.P.Phase and melting relations of a residue eclogite/pyroxenite within an upwelling heterogeneous upper mantle.10th. International Kimberlite Conference Held Bangalore India Feb. 6-11, Poster abstractMantleMelting
DS201412-0312
2014
Green, D.H.Green, D.H., Hibberson, W.O., Rosenthal, A., Kovasc, I., Yaxley, G.M., Falloon, T.J., Brink, F.Experimental study of the influence of water on melting and phase assemblages in the upper mantle.Journal of Petrology, Vol. 55, 10, pp. 2067-2096.MantleMelting
DS201503-0145
2015
Green, D.H.Green, D.H.Experimental petrology of peridotites, including effects of water and carbon on melting in the Earth's upper mantle.Physics and Chemistry of Minerals, Vol. 42, 2, pp. 95-122.MantlePeridotite

Abstract: For over 50 years, the use of high-pressure piston/cylinder apparatus combined with an increasing diversity of microbeam analytical techniques has enabled the study of mantle peridotite compositions and of magmas derived by melting in the upper mantle. The experimental studies have been guided by the petrology and geochemistry of peridotites from diverse settings and by the remarkable range of mantle-derived magma types. Recent experimental study using FTIR spectroscopy to monitor water content of minerals has shown that fertile lherzolite (MORB-source upper mantle) at ~1,000 °C can store ~200 ppm H2O in defect sites in nominally anhydrous minerals (olivine, pyroxenes, garnet and spinel). Water in excess of 200 ppm stabilizes amphibole (pargasite) at P < 3 GPa up to the lherzolite solidus. However, at P > 3 GPa, water in excess of 200 ppm appears as an aqueous vapour phase and this depresses the temperature of the upper mantle solidus. Provided the uppermost mantle (lithosphere) has H2O < 4,000 ppm, the mantle solidus has a distinctive P, T shape. The temperature of the vapour-undersaturated or dehydration solidus is approximately constant at 1,100 °C at pressures up to ~3 GPa and then decreases sharply to ~1,010 °C. The strongly negative dT/dP of the vapour-undersaturated solidus of fertile lherzolite from 2.8 to 3 GPa provides the basis for understanding the lithosphere/asthenosphere boundary. Through upward migration of near-solidus hydrous silicate melt, the asthenosphere becomes geochemically zoned with the ‘enriched’ intraplate basalt source (>500 ppm H2O) overlying the ‘depleted’ MORB source (~200 ppm H2O). From the study of primitive MOR picrites, the modern mantle potential temperature for MORB petrogenesis is ~1,430 °C. The intersection of the 1,430 °C adiabat with the vapour-saturated lherzolite solidus at ~230 km suggests that upwelling beneath mid-ocean ridges begins around this depth. In intraplate volcanism, diapiric upwelling begins from shallower depths and lower temperatures within the asthenosphere and the upwelling lherzolite is enriched in water, carbonate and incompatible elements. Magmas including olivine melilitites, olivine nephelinites, basanites, alkali picrites and tholeiitic picrites are consequences of increasing melt fraction and decreasing pressure at melt segregation. Major element, trace element and isotopic characteristics of island chain or ‘hot-spot’ magmas show that they sample geochemically distinct components in the upper mantle, differing from MORB sources. There is no evidence for higher-temperature ‘hot-spot’ magmas, relative to primitive MORB, but there is evidence for higher water, CO2 and incompatible element contents. The distinctive geochemical signatures of ‘hot-spot’ magmas and their ‘fixed’ position and long-lived activity relative to plate movement are attributed to melt components derived from melting at interfaces between old, oxidised subducted slabs (suspended beneath or within the deeper asthenosphere) and ambient, reduced mantle. In convergent margin volcanism, the inverted temperature gradients inferred for the mantle wedge above the subducting lithosphere introduce further complexity which can be explored by overlaying the phase relations of appropriate mantle and crustal lithologies. Water and carbonate derived from the subducted slab play significant roles, magmas are relatively oxidised, and distinctive primary magmas such as boninites, adakites and island arc ankaramites provide evidence for fluxing of melting in refractory harzburgite to lherzolite by slab-derived hydrous adakitic melt and by wedge-derived carbonatite.
DS201611-2111
2015
Green, D.H.Green, D.H.Experimental petrology of peridotites, including effects of water and carbon on melting in the Earth's upper mantle.Physics and Chemistry of Minerals, Vol. 42, pp. 95-102.MantlePeridotite

Abstract: For over 50 years, the use of high-pressure piston/cylinder apparatus combined with an increasing diversity of microbeam analytical techniques has enabled the study of mantle peridotite compositions and of magmas derived by melting in the upper mantle. The experimental studies have been guided by the petrology and geochemistry of peridotites from diverse settings and by the remarkable range of mantle-derived magma types. Recent experimental study using FTIR spectroscopy to monitor water content of minerals has shown that fertile lherzolite (MORB-source upper mantle) at ~1,000 °C can store ~200 ppm H2O in defect sites in nominally anhydrous minerals (olivine, pyroxenes, garnet and spinel). Water in excess of 200 ppm stabilizes amphibole (pargasite) at P < 3 GPa up to the lherzolite solidus. However, at P > 3 GPa, water in excess of 200 ppm appears as an aqueous vapour phase and this depresses the temperature of the upper mantle solidus. Provided the uppermost mantle (lithosphere) has H2O < 4,000 ppm, the mantle solidus has a distinctive P, T shape. The temperature of the vapour-undersaturated or dehydration solidus is approximately constant at 1,100 °C at pressures up to ~3 GPa and then decreases sharply to ~1,010 °C. The strongly negative dT/dP of the vapour-undersaturated solidus of fertile lherzolite from 2.8 to 3 GPa provides the basis for understanding the lithosphere/asthenosphere boundary. Through upward migration of near-solidus hydrous silicate melt, the asthenosphere becomes geochemically zoned with the ‘enriched’ intraplate basalt source (>500 ppm H2O) overlying the ‘depleted’ MORB source (~200 ppm H2O). From the study of primitive MOR picrites, the modern mantle potential temperature for MORB petrogenesis is ~1,430 °C. The intersection of the 1,430 °C adiabat with the vapour-saturated lherzolite solidus at ~230 km suggests that upwelling beneath mid-ocean ridges begins around this depth. In intraplate volcanism, diapiric upwelling begins from shallower depths and lower temperatures within the asthenosphere and the upwelling lherzolite is enriched in water, carbonate and incompatible elements. Magmas including olivine melilitites, olivine nephelinites, basanites, alkali picrites and tholeiitic picrites are consequences of increasing melt fraction and decreasing pressure at melt segregation. Major element, trace element and isotopic characteristics of island chain or ‘hot-spot’ magmas show that they sample geochemically distinct components in the upper mantle, differing from MORB sources. There is no evidence for higher-temperature ‘hot-spot’ magmas, relative to primitive MORB, but there is evidence for higher water, CO2 and incompatible element contents. The distinctive geochemical signatures of ‘hot-spot’ magmas and their ‘fixed’ position and long-lived activity relative to plate movement are attributed to melt components derived from melting at interfaces between old, oxidised subducted slabs (suspended beneath or within the deeper asthenosphere) and ambient, reduced mantle. In convergent margin volcanism, the inverted temperature gradients inferred for the mantle wedge above the subducting lithosphere introduce further complexity which can be explored by overlaying the phase relations of appropriate mantle and crustal lithologies. Water and carbonate derived from the subducted slab play significant roles, magmas are relatively oxidised, and distinctive primary magmas such as boninites, adakites and island arc ankaramites provide evidence for fluxing of melting in refractory harzburgite to lherzolite by slab-derived hydrous adakitic melt and by wedge-derived carbonatite.
DS201611-2112
2015
Green, D.H.Green, D.H., Falloon, T.J.Mantle-derived magmas: intraplate, hot spots and mid-ocean ridges.Science Bulletin, Vol. 60, 22, pp. 1873-1900.MantleHotspots

Abstract: Primary or parental magmas act as probes to infer eruption and source temperatures for both mid-ocean ridge (MOR) and ‘hot-spot’ magmas (tholeiitic picrites). The experimental petrogenetic constraints (‘inverse’ experiments) argue for no significant temperature differences between them. However, there are differences in major, minor and trace elements which characterise geochemical, not thermal, anomalies beneath ‘hot-spots’. We suggest that diapiric upwelling from interfaces (redox contrasts) between old subducted slab and normal MOR basalt source mantle is the major reason for the observed characteristics of island chain or ‘hot-spot’ volcanism. Intraplate basalts also include widely distributed volcanic centres containing lherzolite xenoliths, i.e. mantle-derived magmas. Inverse experiments on olivine basalt, alkali olivine basalt, olivine basanite, olivine nephelinite, olivine melilitite and olivine leucitite (lamproite) determined liquidus phases as a function of pressure, initially under anhydrous and CO2-absent conditions. Under C- and H-absent conditions, only tholeiites to alkali olivine basalts had Ol + Opx ± Cpx as high-pressure liquidus phases. Addition of H2O accessed olivine basanites at 2.5-3 GPa, ~1,200 °C, but both CO2 and H2O were necessary to obtain saturation with Ol, Opx, Cpx and Ga at 2.5-3.5 GPa for olivine nephelinite and olivine melilitite. The forward and inverse experimental studies are combined to formulate a petrogenetic grid for intraplate, ‘hot-spot’ and MOR magmatism within the plate tectonics paradigm. The asthenosphere is geochemically zoned by slow upward migration of incipient melt. The solidus and phase stabilities of lherzolite with very small water contents (<3,000 ppm) determine the thin plate behaviour of the oceanic lithosphere and thus the Earth’s convection in the form of plate tectonics. There is no evidence from the parental magmas of MOR and ‘hot-spots’ to support the ‘deep mantle thermal plume’ hypothesis. The preferred alternative is the presence of old subducted slabs, relatively buoyant and oxidised with respect to MORB source mantle and suspended or upwelling in or below the lower asthenosphere (and thus detached from overlying plate movement).
DS2001-0312
2001
Green, D.M.Fallon, T.J., Danyushevsky, L.V., Green, D.M.Peridotite melting at 1 GPA: reversal experiments on partial melt compositions produced by peridotite basaltJournal Petrology, Vol. 42, No. 12, pp. 2363-85.MantleExperiments - sandwich, Melting
DS201906-1337
2019
Green, E.C.R.Powell, R., Evans, K.A., Green, E.C.R., White, R.W.The truth and beauty of chemical potentials.Journal of Metamorphic Geology, doi.org.10.1111/ jmg.12484Globalgeochemistry

Abstract: This essay in honour of Mike Brown addresses aspects of chemical equilibrium and equilibration in rocks, with a focus on the role that chemical potentials play. Chemical equilibrium is achieved by diffusive flattening of chemical potential gradients. The idea of equilibration volume is developed, and the way equilibration volumes may evolve along a pressure-temperature path is discussed. The effect of the environment of an equilibration volume is key to understanding the evolution of the equilibration volume with changing conditions. The likely behaviour of equilibration volumes is used to suggest why preservation of equilibrium mineral assemblages and mineral compositions from metamorphism tends to occur. This line of logic then provides the conceptual support to conventional equilibrium thermodynamic approaches to studying rocks, using, for example, thermobarometry and pseudosections.
DS1940-0151
1947
Green, G.A.L.Green, G.A.L.An Editor Looks BackCape Town: Juta., South Africa, Cape ProvinceKimberley, History, Travelogue
DS1990-1329
1990
Green, G.N.Selner, G.I., Green, G.N.DLGGSMUnited States Geological Survey (USGS) Open File, No. 90-0459 A, B, 5p. 1 disc. $ 1.25 and $ 6.00GlobalProgram -DLGGSM.
DS1994-0658
1994
Green, G.N.Green, G.N., Drouillard, P.H.The digital geologic map of Wyoming in Arc/INFO formatUnited States Geological Survey (USGS) Open file, No. 94-0425, 10p. $ 1.75WyomingMap, GIS -digitized
DS2001-0263
2001
Green, H.Dobrzhinetskaya, L.F., Green, H., Mitchell, T., DickersonMetamorphic diamonds: mechanisms of growth and inclusion of oxideGeology, Vol. 29, No. 3, Mar. pp. 263-6.GlobalDiamond inclusions, morphology, Deposit - Kokchetav Massif
DS200912-0179
2009
Green, H.Dobrzhinetskaya, L.F., Wirth, R., Green, H.Lamellae of phylosilicates in K rich diopside from UHP marble of the Kokchetav massif, Kazakhstan: FIB-TEM and synchrotron IR studies.Goldschmidt Conference 2009, p. A296 Abstract.RussiaUHPM - diamond inclusions
DS201412-0197
2014
Green, H.Dobrzhinetskaya, L., Wirth, R., Green, H.Diamonds in Earth's oldest zircons from Jack Hills conglomerate, Australia, are contamination.Earth and Planetary Science Letters, Vol. 387, pp. 212-218.AustraliaDiamond inclusions
DS1970-0917
1974
Green, H.W.Green, H.W., Gueguen, Y.Origin of the Kimberlite Pipes by Upwelling in the Upper Mantle.Nature., Vol. 249, No. 5458, PP. 617-620.South Africa, West AfricaKimberlite Genesis
DS1980-0148
1980
Green, H.W.Green, H.W., Gueguen, Y.Deformation of Peridotite in the Mantle and Extraction by Kimberlite.Eos, Vol. 61, No. 46, P. 1156. (abstract.).United States, Colorado PlateauBlank
DS1986-0302
1986
Green, H.W.Green, H.W., Borch, R., Hobbs, B.E.The pressure dependence of creep in olivine: consequences formantleflowProceedings of the Fourth International Kimberlite Conference, Held Perth, Australia, No. 16, pp. 244-246GlobalBlank
DS1986-0806
1986
Green, H.W.Tingle, T.N., Green, H.W., Finnerty, A.A.The solubility and diffusivity of carbon in olivine:implications for carbon in the earth's upper mantleProceedings of the Fourth International Kimberlite Conference, Held Perth, Australia, No. 16, pp. 349-351New MexicoSan Carlos
DS1988-0698
1988
Green, H.W.Tingle, T.N., Green, H.W., Finnerty, A.A.Experiments and observations bearing on the solubility and diffusivity of carbon in olivine #1Journal of Geophysical Research, Vol. 93, No. B12, December 10, pp. 15, 289- 15, 304GlobalOlivine, Experimental petrology
DS1989-0538
1989
Green, H.W.Green, H.W., Burnley, P.C.A new self organizing mechanism for deep focus earthquakesNature, Vol. 341, October 26, pp. 733-737. Database #18212GlobalMantle, Model -earthquakes
DS1989-1501
1989
Green, H.W.Tingle, T.N., Green, H.W., Finnerty, A.A.Experiments and observations bearing on the solubility and diffusivity of carbon in olivine #2Geological Society of Australia Inc. Blackwell Scientific Publishing, No. 14, Vol. 2, pp. 922-934GlobalRequested not to be cited, Included for citation onl
DS1992-1739
1992
Green, H.W.Zhen-Ming Jin, Green, H.W., Borch, R.S., Shu-Yan Jin, Tingle, T.N.Rare garnet and spinel garnet peridotite xenoliths -token of a modern back-arc geotherm beneath eastern ChinaInternational Symposium Cenozoic Volcanic Rocks Deep seated xenoliths China and its, Abstracts pp. 67-68ChinaXenoliths, Peridotite
DS1994-0847
1994
Green, H.W.Jin, Z-M., Green, H.W., Shou, Y.Melt topology in partially molten mantle peridotite during ductiledeformation.Nature, Vol. 372, No. 6502, Nov. 10, pp. 164-166.MantleMelting
DS1999-0170
1999
Green, H.W.Dobrzhinetskaya, L., Bpzilov, K.N., Green, H.W.The solubility of TiO2 in olivine: implications for the mantle wedgeenvironment.Chemical Geology, Vol. 160, No. 4, Sept. 2, pp. 357-70.MantleMineral chemistry - olivine
DS2000-0626
2000
Green, H.W.Massone, H.J., Dobrzhinetskaya, L., Green, H.W.Quartz Potassium feldspar intergrowths enclosed in eclogitic garnet and omphacite. are pseudomorphs after coesite?Igc 30th. Brasil, Aug. abstract only 4p.Globalmetamorphism, Dabie Shan
DS2001-0408
2001
Green, H.W.Green, H.W.Plate tectonics: a graveyard for bouyant slabs?Science, No. 5526, June 29, pp. 2445-6.MantleSubduction
DS2001-0537
2001
Green, H.W.Jin, Z.M., Zhang, J., Green, H.W., Jin, S.Eclogite rheology: implications for subducted lithosphereGeology, Vol. 29, No. 8, Aug. pp. 667-70.ChinaGarnet, subduction, ultra high pressure (UHP), Dabie Shan
DS2003-0339
2003
Green, H.W.Dobrzhinetskaya, L.F., Green, H.W., Bozhilov, K.N., Mitchell, T.E., Dickerson, R.M.Crystallization environment of Kazakhstan microdiamond: evidence from nanometricJournal of Metamorphic Geology, Vol. 21, 5, pp. 425-38.Russia, KazakhstanMineral inclusions
DS2003-0340
2003
Green, H.W.Dobrzhinetskaya, L.F., Green, H.W., Weschler, M., Darus, M., Wang, Y.C.Focused ion beam technique and transmission electron microscope studies ofEarth and Planetary Science Letters, Vol. 210, 3-4, pp. 399-410.GermanyTechnology
DS2003-0341
2003
Green, H.W.Dobrzhinetskaya, L.F., Green, H.W., Weschler, M., Darus, M., Young-ChungFocused ion beam technique and transmission electron microscope studies ofEarth and Planetary Science Letters, Vol. 210, 3-4, May 30, pp.399-410.GermanyDiamond inclusions
DS2003-0496
2003
Green, H.W.Green, H.W.Psychology of a changing paradigm: ultra high pressure metamorphismGeological Society of America, Annual Meeting Nov. 2-5, Abstracts p.95.MantleUHP
DS200412-0463
2003
Green, H.W.Dobrzhinetskaya, L.F., Green, H.W., Bozhilov, K.N., Mitchell, T.E., Dickerson, R.M.Crystallization environment of Kazakhstan microdiamond: evidence from nanometric inclusions and mineral associations.Journal of Metamorphic Geology, Vol. 21, 5, pp. 425-38.Russia, KazakhstanMicrodiamonds, mineral inclusions
DS200412-0464
2003
Green, H.W.Dobrzhinetskaya, L.F., Green, H.W., Weschler, M., Darus, M., Young-Chung, Wang, Massone, H-J., Stockhert, B.Focused ion beam technique and transmission electron microscope studies of microdiamonds from the Saxonian Erzgerbirge, Germany.Earth and Planetary Science Letters, Vol. 210, 3-4, May 30, pp.399-410.Europe, GermanyDiamond inclusions
DS200412-0714
2003
Green, H.W.Green, H.W.Psychology of a changing paradigm: ultra high pressure metamorphism.Geological Society of America, Annual Meeting Nov. 2-5, Abstracts p.95.MantleUHP
DS200412-2169
2003
Green, H.W.Yang, J., Xu, Z., Dobrzhinetskaya, L.F., Green, H.W., Pei, X., Shi, R., Wu, C., Wooden, J.L., Zhang, J., WanDiscovery of metamorphic diamonds in central China: an indication of a > 4000 km long zone of deep subduction resulting from mulTerra Nova, Vol. 15, pp. 370-379.ChinaSubduction, Central Orogenic Belt, UHP
DS200512-0238
2004
Green, H.W.Dobrzhinetskaya, L.F., Green, H.W., Renfro, A.P., Bozhilov, K.N., Spengler, D., Van Roemund, H.L.M.Precipitation of pyroxenes and Mg2SiO4 from majorite garnet: simulation of peridotite exhumation from great depth.Terra Nova, Vol. 16, 6, pp. 325-330.MantlePetrology - peridotite
DS200512-0240
2005
Green, H.W.Dobrzhinetskaya, L.F., Wirth, R., Green, H.W.Direct observation and analysis of a trapped COH fluid growth medium in metamorphic diamond.Terra Nova, Vol. 17, 5, Oct. pp. 472-477.KazakhstanDiamond morphology, metamorphic, UHP Kokchetav Massif
DS200512-0364
2005
Green, H.W.Green, H.W.Psychology of a changing paradigm: 40 + years of high pressure metamorphism.International Geology Review, Vol. 47, 5, May, pp. 439-456.MantleUHP
DS200612-0339
2005
Green, H.W.Dobrzhinetskaya, L.F., Wirth, R., Green, H.W.Direct observation and analysis of a trapped COH fluid growth medium in metamorphic diamond.Terra Nova, Vol. 17, 5, pp. 472-477.MantleUHP
DS200712-0254
2007
Green, H.W.Dobrzhinetskaya, L., Liu, Z., Green, H.W.Synchrotron infrared spectroscopy: confirmation of metamorphic diamond crystallization from C-O-H fluid. ( Erzgebirge region).Frontiers in Mineral Sciences 2007, Joint Meeting of Mineralogical societies Held June 26-28, Cambridge, Abstract Volume p.149.Europe, GermanyDiamond genesis
DS200712-0255
2007
Green, H.W.Dobrzhinetskaya, L., Liu, Z., Green, H.W.Synchrotron infrared spectroscopy: confirmation of metamorphic diamond crystallization from C-O-H fluid. ( Erzgebirge region).Frontiers in Mineral Sciences 2007, Joint Meeting of Mineralogical societies Held June 26-28, Cambridge, Abstract Volume p.149.Europe, GermanyDiamond genesis
DS200712-0256
2007
Green, H.W.Dobrzhinetskaya, L., Takahata, N., Sano, Y., Green, H.W.Fluid organic matter interaction at high pressure and temperature: evidence from metamorphic diamonds.Frontiers in Mineral Sciences 2007, Joint Meeting of Mineralogical societies Held June 26-28, Cambridge, Abstract Volume p. 279.Russia, Kazakhstan, Europe, GermanyKokchetav and Erzgebirge
DS200712-0257
2007
Green, H.W.Dobrzhinetskaya, L., Takahata, N., Sano, Y., Green, H.W.Fluid organic matter interaction at high pressure and temperature: evidence from metamorphic diamonds.Frontiers in Mineral Sciences 2007, Joint Meeting of Mineralogical societies Held June 26-28, Cambridge, Abstract Volume p. 279.Russia, Kazakhstan, Europe, GermanyKokchetav and Erzgebirge
DS200712-0258
2007
Green, H.W.Dobrzhinetskaya, L.F., Green, H.W.Diamond synthesis from graphite in the presence of water and SiO2: implications for diamond formation in quartzites from Kazakhstan.International Geology Review, Vol. 49, 5, pp. 389-400.Russia, KazakhstanDiamond genesis
DS200712-0259
2007
Green, H.W.Dobrzhinetskaya, L.F., Green, H.W.Experimental studies of mineralogical assemblages of metasedimentary rocks at Earth's mantle transition zone conditions.Journal of Metamorphic Geology, Vol. 25, 2, pp. 83-96.MantleMineralogy
DS200712-0260
2007
Green, H.W.Dobrzhinetskaya, L.F., Wirth, R., Green, H.W.A look inside of diamond forming media in deep subduction zones.Proceedings of National Academy of Sciences USA, Vol. 104, 22, pp. 9128-9132. IngentaMantleSubduction
DS200712-0641
2007
Green, H.W.Liu, X., Jin,Z., Green, H.W.Clinoenstatite exsolution in diopsidic augite of Dabie Shan - garnet peridotite from depth of 300 km.Americam Mineralogist, Vol. 92, 4, pp. 546-552.ChinaUHP
DS200912-0177
2008
Green, H.W.Dobrzhinetskaya, L., Wirth, R., Yang, J., Green, H.W.Nontraditional 'deliverers' of UHP rocks from Earth's deep interior to surface.American Geological Union, Fall meeting Dec. 15-19, Eos Trans. Vol. 89, no. 53, meeting supplement, 1p. abstractMantleUHP
DS200912-0180
2009
Green, H.W.Dobrzhinetskaya, L.F., Wirth, R., Rhede, D., Liu, Z., Green, H.W.Phlogopite and quartz lamellae in diamond bearing diopside from marbles of the Kokchetav massif, Kazakhstan: exsolution or replacement reaction?Journal of Metamorphic Geology, Vol. 27, 9, pp. 607-620.Russia, KazakhstanDeposit - Kokchetav
DS200912-0347
2009
Green, H.W.Jung, H., Mo, W., Green, H.W.Upper mantle seismic anisotropy resulting from pressure induced slip transition in olivine.Nature Geoscience, Vol. 2, 1, pp. 73-77.MantleAnisotropy
DS201012-0643
2010
Green, H.W.Ruskov, T., Spirov, I., Georgieva, M., Yamamoto, S., Green, H.W., McCammon, C.A., Dobrzhinetskaya, L.F.Mossbauer spectroscopy studies of the valence state of iron in chromite from the Luobusa Massif of Tibet: implications for a highly reduced mantle.Journal of Metamorphic Geology, Vol. 28, 5, pp. 551-560.Asia, TibetMetasomatism
DS201012-0853
2010
Green, H.W.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
DS201112-0279
2011
Green, H.W.Dobrzhinetskaya, L., Wirth, R., Green, H.W., Sumino, H.Fluids nature at peak of ultrahigh pressure metamorphism in deep subduction zones - evidence from diamonds.Goldschmidt Conference 2011, abstract p.769.Russia, Kazakhstan, Europe, GermanyUHP - Kokchetav
DS201112-1161
2011
Green, H.W.Zhang, J.F., Xu, H.J., Liu, Q., Green, H.W., Dobrzhinetskaya, L.F.Pyroxene exsolution topotaxy in majoritic garnet from 250 to 300 km depth.Journal of Metamorphic Geology, Vol. 29, 7, pp. 741-751.TechnologyGarnet mineralogy
DS201112-1162
2011
Green, H.W.Zhang, J.F., Xu, H.J., Liu, Q., Green, H.W., Dobrzhinetskaya, L.F.Pyroxene evolution topotaxy in majorite garnet from 250 to 300 km depth.Journal of Metamorphic Geology, In press available,MantleGarnet
DS201212-0163
2013
Green, H.W.Dobrzhinetskaya, L.F., Wirth, R., Green, H.W., Schreiber, A., O'Bannon, E.First find of polycrystalline diamond in ultrahigh-pressure metamorphic terrane of Erzgebirge, Germany.Journal of Metamorphic Geology, Vol. 31, 1, pp. 5-18.Europe, GermanyUHP
DS201212-0164
2012
Green, H.W.Dobrzhinskaya, L.F., Wirth, R., Green, H.W., Schreiber, A., O'bannon, E.First find of polycrystalline diamond in ultrahigh pressure metamorphic terrane of Erzgebirge Germany.Journal of Metamorphic Geology, in press availableEurope, GermanyUHP
DS201312-0219
2013
Green, H.W.Dobrzhinetskaya, L., Wirth, R., Green, H.W., Schreiber, A., O'Bannon, E.First find of polycrystalline diamond in ultrahigh pressure metamorphic terrane of Erzgebirge Germany.Journal of Metamorphic Geology, Vol. 31, pp. 5-18.Europe, GermanyUHP
DS201412-0985
2014
Green, H.W.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
DS1991-0799
1991
Green, H.W. IIJin, Z.M, Green, H.W. II, Borch, R.S., Tingle, T.N.Unusual spinel garnet lherzolite xenoliths from basalts in eastern China:constraints on the late Tertiary thermal structure of the upper mantleProceedings of Fifth International Kimberlite Conference held Araxa June 1991, Servico Geologico do Brasil (CPRM) Special, pp. 212-213ChinaLherzolite xenoliths -analyses, Geochemistry
DS1996-0370
1996
Green, H.W. IIDobrzhinetskaya, L., Green, H.W. II, Wang, S.Alpe Arami: a peridotite Massif from depths of more than 300 kilometersScience, Vol. 271, March 29, pp. 1841-45.GlobalPeridotite massif, Mantle
DS1983-0262
1983
Green, H.W.IIGreen, H.W.II, Gueguen, Y.Deformation of Peridotite in the Mantle and Extraction by Kimberlite a Case History Documented by Fluid and Solid Precipitates in Olivine.Tectonophysics, Vol. 92, No. 1-3, PP. 71-92.AustraliaPetrography
DS200712-0639
2007
Green, H.W.IILiu, L., Zhang, J., Green, H.W.II, Jin, Z., Bozhilov, K.N.Evidence of former stishovite in metamorphosed sediments, implying subduction to > 350 km.Earth and Planetary Science Letters, Vol. 263,3-4, Nov.30, pp. 180-191.MantleUHP
DS1987-0741
1987
Green, H.W.II.Tingle, T.N., Green, H.W.II.Carbon solubility in olivine: implications for upper mantle evolutionGeology, Vol. 15, No. 4, April pp. 324-326GlobalMantle genesis, Carbon
DS200512-0239
2004
Green, H.W.II.Dobrzhinetskaya, L.F., Renfro, A.P., Green, H.W.II.Synthesis of skeletal diamonds: implications for microdiamond formation in orogenic belts.Geology, Vol. 32, 10, Oct. pp. 869-872.KazakhstanUHP, C-O-H fluid, Kokchetav massif
DS200612-0340
2006
Green, H.W.II.Dobrzhinetskaya, L.F., Wirth, R., Green, H.W.II.Nanometric inclusions of carbonates in Kokchetav diamonds from Kazakhstan: a new constraint for the depth of metamorphic diamond crystallization.Earth and Planetary Science Letters, Vol. 243, 1-2, Mar. 15, pp. 85-93.Russia, KazakhstanDiamond morphology, metamorphism
DS200712-0642
2007
Green, H.W.II.Liu, X-W., Jin, Z-M., Green, H.W.II.Clinoenstatite exsolution in diopsidic augite of Dabieshan: garnet peridotite from depth of 300 km.American Mineralogist, Vol. 92, pp. 546-552.ChinaPeridotite, UHP
DS200712-1226
2007
Green, H.W.II.Zhang, J., Green, H.W.II.On the deformation of UHP eclogite: from laboratory to nature.International Geology Review, Vol. 49, 6, pp. 487-503.MantleUHP
DS200812-0430
2008
Green, H.W.II.Green, H.W.II.Are subducting zones dry below 400 km?Goldschmidt Conference 2008, Abstract p.A326.MantleSubduction
DS201212-0822
2012
Green, H.W.II.Zhao, S., Jin, Z., Zhang, J., Xu, H., Xia, G., Green, H.W.II.Does subducting lithosphere weaken as it enters the lower mantle?Geophysical Research Letters, Vol. 39, L10311 5p.MantleSubduction
DS201312-0792
2013
Green, H.W.II.Schubnel, A., Brunet, F., Hilairet, N., Gasc, J., Wang, Y., Green, H.W.II.Deep focus earthquake analogs recorded at high pressure and temperature in the laboratory.Science, Vol. 341, no. 6152, pp. 1377-1380. Sept. 20TechnologySubduction
DS1981-0187
1981
Green, J.C.Green, J.C.Geologic and Geochemical Evidence for the Nature and Development of the Precambrian Midcontinent Rift of North America.Lpi Contribution., No. 457, PP. 110-113.GlobalMid-continent
DS1982-0226
1982
Green, J.C.Green, J.C.Geology of the Keweenawan Extrusive RocksGeological Society of America (GSA) MEMOIR., No. 156, PP. 47-55.GlobalMid-continent
DS1983-0263
1983
Green, J.C.Green, J.C.Geologic and Geochemical Evidence for the Nature and Development of the Middle Proterozoic (keweenawan) Midcontinent Rift of North America.Tectonophysics, Vol. 94, PP. 413-437.GlobalMid-continent
DS1983-0264
1983
Green, J.C.Green, J.C., Brannon, J.G.Physical Volcanology of a Proterozoic Continental Rift: The keweenawan North Shore Volcanics, Minnesota.Geological Society of America (GSA), Vol. 15, No. 6, P. 586. (abstract.).GlobalMid Continent
DS1985-0248
1985
Green, J.C.Green, J.C., Chandler, V.C.Diabase Dikes of the Midcontinent Rift in Minnesota: a Record of Keweenawan Magmatism and Tectonic Development.Geological Society of America (GSA), Vol. 17, No. 7, P. 597. (abstract.).United States, Great Lakes, MinnesotaMidcontinent, Tectonics
DS1989-0355
1989
Green, J.C.Dickas, A.B., Bornhorst, T.J., Ojakangas, R.W., Green, J.C.Lake Superior basin segment of the Midcontinent rift systemAmerican Geophysical Union (AGU) 28th. International Geological Congress Field Trip Guidebook, No. T 344, 62pMidcontinentTectonics
DS1989-0539
1989
Green, J.C.Green, J.C., Fitz, T.J.Large rhyolites in the Keweenawan midcontinent rift plateau volcanics of Minnesota- lavas orrheoignimbrites?New Mexico Bureau of Mines Bulletin., Continental Magmatism Abstract Volume, Held, Bulletin. No. 131, p. 113 Abstract held June 25-July 1MinnesotaVolcanology
DS1989-1148
1989
Green, J.C.Ojakangas, R.W., Green, J.C., Holst, T.B.35th. Annual Institute on Lake Superior Geology,Proceedings andAbstracts, held Duluth Minnesota,May 4-5, 1989Institute Lake Superior Geology, 35th. VolumeMinnesota, MichiganMid continent, Tectonics
DS1991-1234
1991
Green, J.C.Nicholson, S.W., Green, J.C.Regional neodymium and lead isotopic variations among the earliest midcontinent rift basalts in western Lake SuperiorGeological Association of Canada (GAC)/Mineralogical Association of Canada/Society Economic, Vol. 16, Abstract program p. A90OntarioTectonics, Rifting
DS1992-0604
1992
Green, J.C.Green, J.C.Proterozoic rifts: North American Rift systemProterozoic Crustal Evolution, K.C. Condie, Developments in Precambrian, Chapter 3, pp. 116-119.Appalachia, OntarioTectonics, Midcontinent Rift
DS1993-0573
1993
Green, J.C.Green, J.C., Fitz, T.J.Extensive felsic lavas and rheoignimbrites in the Keweenawan Midcontinent rift plateau volcanics, Minnesota: petrographic and field recognitionJournal of Volcanology and Geothermal Research, Vol. 54, No. 3-4, January pp. 177-196MinnesotaVolcanics, Petrology
DS1995-1380
1995
Green, J.C.Ojakangas, R.W., Dickas, A.B., Green, J.C.Basement tectonics - No. 10 proceedings -prev. held 1992Kluwer Academic Publ, 450pUnited States, MidcontinentStructures, lineaments, tectonics, shear zones, Table of contents
DS1997-0247
1997
Green, J.C.Davis, D.W., Green, J.C.Geochronology of the North American Midcontinent rift in western Lake superior and implications -geodynamicsCanadian Journal of Earth Sciences, Vol. 34, No. 4, April, pp. 476-488MidcontinentGeochronology, tectonics, Geodynamics
DS1997-0868
1997
Green, J.C.Ojakangas, R.W., Diackas, A.B., Green, J.C.Middle Proterozoic to Cambrian rifting, central North AmericaGeological Society of America, SPE312, 326p. approx. $ 80.00 United StatesNorth AmericaBook - ad, Tectonics, rifting
DS1997-0869
1997
Green, J.C.Ojakangas, R.W., Dickas, A.B., Green, J.C.Middle Proterozoic to Cambrian rifting central North AmericaGeological Society of America Special Paper, No. 312, $ 100.00Appalachia, MidcontinentBook - ad, Tectonics, rifting
DS1997-1208
1997
Green, J.C.Vervoort, J.D., Green, J.C.Origin of evolved magmas in the Midcontinent rift system: ND isotope evidence for melting Archean crust.Canadian Journal of Earth Sciences, Vol. 34, No. 4, April, pp. 521-535.Minnesota, MidcontinentGeochronology, Magma
DS1983-0265
1983
Green, J.G.Green, J.G.Geologic and geochemical evidence for the nature and development of the Middle Proterozoic Keweenawan ...Tectonophysics, Vol. 94, pp; 413-37.Minnesota, Wisconsin, MidcontinentTectonics - Rifting, Geochemistry
DS1992-0460
1992
Green, J.M.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
DS1985-0249
1985
Green, K.Green, K.China's Gem DiamondsThe China Business Review, May-June pp. 13-15ChinaDiamond, Production
DS1940-0176
1948
Green, L.C.Green, L.C.To the River's End #1Cape Town: Howard Timmins, 208P.Southwest Africa, Namibia, South Africa, BotswanaTravelogue, True Adventure, Diamonds, Kimberley
DS1930-0138
1933
Green, L.G.Green, L.G.The Coast of TreasureLondon: Putnam., 269P.Southwest Africa, NamibiaDiamonds, Kimberley, Occurrences
DS1930-0189
1935
Green, L.G.Green, L.G.Who Found the First Diamonds at LuderitzCape Argus, AUGUST 17TH.Southwest Africa, NamibiaHistory
DS1930-0190
1935
Green, L.G.Green, L.G.No More Diamond Raids in NamaqualandCape Argus, JUNE 8TH. P. 13.Southwest Africa, NamibiaHistory, Politics
DS1930-0216
1936
Green, L.G.Green, L.G.Secret Africa 1936London: Stanley Paul, 187P.South AfricaKimberley, History
DS1930-0245
1937
Green, L.G.Green, L.G.The Coast of DiamondsCape Town: Howard Timmins, 287P.Southwest Africa, NamibiaDiamond, Fiction, Kimberley
DS1930-0297
1939
Green, L.G.Green, L.G.Strange AfricaLondon: Stanley Paul, South AfricaKimberley, Fiction
DS1940-0114
1946
Green, L.G.Green, L.G.Secret Africa 1946London: Stanley Paul, 280P.South AfricaKimberley, History
DS1940-0115
1946
Green, L.G.Green, L.G.So Few Are FreeCape Town: Monarch House., 250P.Southwest Africa, NamibiaHistory, Kimberley
DS1940-0210
1949
Green, L.G.Green, L.G.To the River's End #2Cape Town: Harold Timmins, South AfricaHistory, Travelogue, Kimberley
DS1960-0245
1962
Green, L.G.Green, L.G.Something Rich and StrangeCape Town: Timmins, 258P.South AfricaKimberley, History
DS1960-0832
1967
Green, L.G.Green, L.G.Like Diamond Blazing; the Story of the Diamonds of South Africa and the Men Who Sought and Found and Stole Diamonds in Strange Places.London: Hale., 206P.South Africa, Southwest Africa, Namibia, PeruKalahari, Vaal River Diggings, Orange River Area, Kimberley
DS1960-0954
1968
Green, L.G.Green, L.G.Like Diamond BlazingCape Town: Struik, 295P.South AfricaHistory, Kimberley
DS2003-0497
2003
Green, M.Green, M.Crime of opportunity. In December 2000, a parcel of 21 diamonds vanished en routeCanadian Diamonds, Summer 2003, pp. 22-26.Northwest TerritoriesNews item - Sirius Diamonds
DS200412-0715
2003
Green, M.Green, M.Crime of opportunity. In December 2000, a parcel of 21 diamonds vanished en route from Yellowknife.Canadian Diamonds, Summer 2003, pp. 22-26.Canada, Northwest TerritoriesNews item - Sirius Diamonds
DS201212-0584
2012
Green, M.B.Rice, M.D., Tierney, S., O'Hagan, S., Lyons, D., Green, M.B.Knowledge, influence and firm level change: a geographic analysis of board membership associated with Canada's growing and declining businesses.Geoforum, Vol. 43, pp. 959-968.CanadaCSR - governance
DS2000-0358
2000
Green, M.G.Green, M.G., Sylvester, P.J., Buick, R.Growth and recycling of Early Archean continental crust: geochemical evidence from Pilbara Craton.Tectonophysics, Vol. 322, No. 1-2, pp. 69-88.AustraliaGeochemistry - subduction
DS1989-0365
1989
Green, N.L.Donahoe, J.L., Green, N.L., Fang, Jen-HoAn expert system for idenification of minerals in thin sectionJournal of Geology Education, Vol. 37, No. 1, pp. 4-6. Database # 17586GlobalGIS - Mineralogy, Computer- Expert system
DS1999-0295
1999
Green, N.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
DS200612-0822
2005
Green, O.R.Lindsay, J.F., Brasier, M.D., McLoughlin, N., Green, O.R., Fogel, M., Steele, A., Mertzman, S.A.The problem of deep carbon - an Archean paradox.Precambrian Research, Vol. 143,1-4, Dec. 15, pp. 1-22.AustraliaCarbon dykes, geochronology
DS1960-0408
1963
Green, P.Turno, S.G. DI, Green, P.Diamond RiverLondon: Hamish Hamilton., 208P.VenezuelaKimberlite, Kimberley, Janlib, Travelogue
DS1989-0540
1989
Green, P.F.Green, P.F., Duddy, I.R., Leslett, G.M., Hegarty, K.A., GleadowThermal annealing of fission tracks in apatite, 4. Quantitative modelling techniques and extension to geological timescalesChemical Geology, Vol. 79, No. 2, August 1, pp. 155-GlobalGeochronology, Timescales
DS1999-0735
1999
Green, P.F.Thomson, K., Green, P.F., Whithm, A.G., Price, S.P.New constraints on the thermal history of southeast Greenland from apatite fission track analysis.Geological Society of America (GSA) Bulletin., Vol. 111, No. 7, July pp. 1054-68.GreenlandGeothermometry
DS2002-0869
2002
Green, P.F.Kohn, B.F., Green, P.F.Low temperature thermochronology: from tectonics to Lands cape evolutionTectonophysics, Vol. 349,No.1-4, pp. 1-4.GlobalGeothermometry
DS200812-1189
2008
Green, P.F.Turner, J.P., Green, P.F., Hoford, S.P., Lawrence, S.R.Thermal history of the Rio Muni (West Africa) - NE Brazil margins during continental breakup.Earth and Planetary Science Letters, Vol. 270, 3-4, pp. 354-367.Africa, West Africa, South America, BrazilGeothermometry
DS200612-0494
2006
Green, P.K.Green, P.K., Duddy, I.R.Interpretation of apatite ( U-Th) /He ages and fission track ages from cratons.Earth and Planetary Science Letters, in pressEurope, Sweden, FennoscandiaGeothermometry, geochronology
DS1991-1664
1991
Green, P.M.Stone, P., Green, P.M., Lintern, B.C., Plant, J.A., Simpson, P.R.Geochemistry characterizes provenance in southern ScotlandGeology Today, Vol. 7, No. 5, September/October pp. 177-181ScotlandGeochemistry, Geology
DS1992-0258
1992
Green, R.W.E.Cichowicz, A., Green, R.W.E.Tomographic study of upper mantle structure of the South African using wave form inversionPhysics of the Earth and Planetary Interiors, Vol. 72, No. 3-4, August pp. 276-South AfricaMantle, Geophysics -seismics
DS1992-0404
1992
Green, R.W.E.Durrheim, R.J., Green, R.W.E.A seismic refraction investigation of the Archean Kaapvaal craton, SouthAfrica, using mine tremors as the energy sourceGeophys. Journal of International, Vol. 108, No. 3, March pp. 812-832South AfricaGeophysics -seismics, Craton
DS1995-0673
1995
Green, R.W.E.Green, R.W.E., Smith, C.B., Jones, Muller, ViljoenProgress towards understanding the Kaapvaal lithosphere geophysical and geochemical perspectives.Proceedings of the Sixth International Kimberlite Conference Extended Abstracts, p. 188-90.South AfricaGeophysics, Craton -Kaapvaal
DS1995-0674
1995
Green, R.W.E.Green, R.W.E., Webb, S.J., Wright, C.Broad band seismic studies in southern AfricaSouth Afr. Journal of Science, Vol. 91, No. 5, May pp. 234-239South AfricaGeophysics -seismics
DS1995-0675
1995
Green, R.W.E.Green, R.W.E., Webb, S.J., Wright, C.Broad band seismic studies in southern AfricaSouth Afr. Journal of Science, Vol. 91, No. 5, May pp. 234-239.South AfricaGeophysics -seismics
DS1995-1776
1995
Green, R.W.E.Smith, C.B., Green, R.W.E., Jones, M., Viljoen, K.S.Progress two ards understanding the evolution of the Kaapvaal lithosphere:the mantle perspective.Centennial Geocongress (1995) Extended abstracts, Vol. 1, p. 343-346. abstractSouth AfricaCraton, Mantle
DS1995-1998
1995
Green, R.W.E.Vinnick, L.P., Green, R.W.E., Nicolaysen, L.O.Recent deformation of the deep continental root beneath southern AfricaNature, Vol. 375, No. 6526, May 4, pp. 50-52.South Africa, BotswanaMantle, tectonics, Craton, root
DS1995-1999
1995
Green, R.W.E.Vinnik, L.P., Green, R.W.E., Nicolaysen, L.O., KosarevDeep seismic structure and kimberlites of the Kaapvaal cratonProceedings of the Sixth International Kimberlite Conference Abstracts, pp. 656.South AfricaGeophysics -seismics, Craton -Kaapvaal
DS1996-1482
1996
Green, R.W.E.Vinnik, L.P., Green, R.W.E., Nicolaysen, L.O.Seismic constraints on dynamics of the mantle of the Kaapvaal cratonPhysics of the Earth and Planetary Interiors, Vol. 95, pp. 139-151.South AfricaGeophysics -seismics, Kaapvaal Craton
DS1996-1483
1996
Green, R.W.E.Vinnik, L.P., Green, R.W.E., Nicolaysen, L.O., Kosarev...Deep seismic structure of the Kaapvaal CratonTectonophysics, Vol. 262, No. 1-4, Sept. 30, pp. 67-75.South Africa, southern AfricaGeophysics - seismics, Craton - Kaapvaal
DS1993-1296
1993
Green, S.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
DS1991-1433
1991
Green, S.B.Robert, F., Sheahan, P.A., Green, S.B.Greenstone gold and crustal evolution, Nuna Conference held Val d'Or May1990Geological Association of Canada (GAC)/Mineral Deposits Division Publ, 237p. $ 25.00Quebec, Ontario, Australia, South AfricaGreenstone belt, Gold genesis
DS1981-0188
1981
Green, T.Green, T.The World of Diamonds #2Weidenfeld And Nicolson., 261P.China, South Africa, Namibia, Southwest Africa, Botswana, RussiaDiamond Industry, Marketing
DS1981-0189
1981
Green, T.Green, T.The World of Diamonds #1New York: W. Morrow And Co. Inc., 300P.GlobalKimlibkimlib
DS1996-0563
1996
Green, T.Green, T., Duval, D., Louthean, R.New frontiers in diamondsDuval Minecom, 416 470 Granville Street, Vancouver BC., 604 669-1493 Fax $ 65.00 inc. P and HGlobalBook, Anecdotes, diamond industry, companies, areas of intere
DS2001-0004
2001
Green, T.Adam, J., Green, T.Experimentally determined partition coefficients for minor and trace elements in peridotite minerals...European Journal of Mineralogy, Vol. 13, pp. 815-27.GlobalCarbonatite melt, relevance to natural Carbonatite, Microprobe ICP-MS
DS2001-0409
2001
Green, T.Green, T., Adam, J.Partition co-efficients - modeling crust-mantle... carbonatite - a popular mantle metasomatic agent.Gemoc Annual Report 2000, p. 34-5.MantleCarbonatite, Geochemistry
DS200612-0001
2006
Green, T.Adam, J., Green, T.Trace element partitioning between mica and amphibole bearing garnet lherzolite and hydrous basanitic melt: 1. experimental results and the investigation controlsContributions to Mineralogy and Petrology, Online, availableAustralia, TasmaniaPartitioning behaviour, melting
DS1990-0615
1990
Green, T.H.Guo, J.F., Green, T.H.Experimental study of barium partitioning between phlogopite and silicate liquid at upper-mantle pressure and temperatureLithos, Vol. 24, No. 2, March pp. 83-95GlobalExperimental petrology, Mantle
DS1990-0616
1990
Green, T.H.Guo, J.F., Green, T.H., O'Reilly, S.Y.Barium partitioning and anorthoclase megacryst genesisGeological Society of Australia Abstracts, No. 25, No. A12.11 pp. 239. AbstractAustraliaMagma, barium, Ba content
DS1991-0602
1991
Green, T.H.Green, T.H., Adam, J.Assessment of the garnet-clinopyroxene iron-magnesium exchange thermometer using new experimental dataJournal of Metamorphic Geology, Vol. 9, No. 3, May pp. 341-347AustraliaEclogites, Geothermetry
DS1992-0605
1992
Green, T.H.Green, T.H., Adam, ., Sie, S.H.Trace element partitioning between silicate minerals and carbonatite at 25Kbar and application to mantle MetasomatismMineralogy and Petrology, Vol. 46, No. 3, pp. 179-184MantleSilicates, Metasomatism
DS1992-0606
1992
Green, T.H.Green, T.H., Adam, J., Sie, S.Trace element partitioning and mantle Metasomatism11th. Australian Geol. Convention Held Ballarat University College, Jan., Listing of papers to be given attempting to get volAustraliaGeochemistry, Mantle
DS1993-0574
1993
Green, T.H.Green, T.H., Adam, J., Sie, S.H.Proton microprobe determined trace element partition coefficients betweenpargasite, augite and silicate of carbonatitic meltsEos, Transactions, American Geophysical Union, Vol. 74, No. 16, April 20, supplement abstract p. 340GlobalMineral chemistry, Carbonatite
DS1995-0676
1995
Green, T.H.Green, T.H.Experimental versus natural two mineral partition coefficients: a high techcontroversyInternational Geology Review, Vol. 37, No. 10, Oct. pp. 851-865GlobalPetrology -partitioning
DS1995-0677
1995
Green, T.H.Green, T.H.Significance of Niobium and Tantalum as an indicator of geochemical processes in the crust mantle systemChemical Geology, Vol. 120, No. 3-4, March 1, pp. 347-359.MantleGeochemistry -Niobium, TantaluM., Carbonatite
DS1999-0174
1999
Green, T.H.Draper, D.S., Green, T.H.P - T phase relations of silicic, alkaline, aluminous liquids: new result sand applications to mantle meltingEarth and Planetary Science Letters, Vol. 170, No. 3, July 15, pp. 255-68.MantleMelt - alkaline rocks, Metasomatism
DS1999-0175
1999
Green, T.H.Draper, D.S., Green, T.H.P T phase relations of silicic alkaline, aluminous liquids: new results and apllications to mantle meltingEarth and Planetary Science Letters, Vol. 170, No. 3, July 15, pp. 215-39.MantleMetasomatism
DS2000-0359
2000
Green, T.H.Green, T.H., Blundy, J.D., Adam, J., Yaxley, G.M.SIMS determination of trace element partition coefficients between clinopyroxene and basaltsLithos, Vol. 53, No. 3-4, Sept. 1, pp. 165-87.GlobalPetrology - experimental, Garnet
DS2000-0360
2000
Green, T.H.Green, T.H., Blundy, J.D., Adam, J., Yaxley, G.M.SIMS determination of trace element partion coefficients between garnet, clinopyroxene and basalticLithos, Vol. 53, No. 3-4, Sept. pp. 165-87.GlobalPetrology - experimental, Gpa and Temp
DS200612-0495
2006
Green, T.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
Green, T.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
DS201212-0002
2012
Green, T.H.Adam, J., Oberti, R., Camara, F., Green, T.H., Rushmer, T.The effect of water on equilibrium relations between clinopyroxenes and basanitic magmas: tracing water and non- volatile incompatible elements in the Earth's mantle.emc2012 @ uni-frankfurt.de, 1p. AbstractMantleMelting
DS1981-0190
1981
Green, T.S.Green, T.S.Diamond Diggers in Namibia Sift Ocean Sands for GemstonesSmithsonian., Vol. 12, No. 2, MAY, PP. 48-57.Southwest Africa, NamibiaHistory, Mining Methods, Littoral Diamond Placers
DS200412-2204
2004
Green, W.H.Zhang, J., Green, W.H., Bozhillov, K., Jin, Z.Faulting induced by precipitation of water at grain boundaries in hot subducting oceanic crust.Nature, Vol. 428, April 8, 633-636.MantleSubduction
DS1991-0603
1991
Green, W.V.Green, W.V., Achauer, U., Meyer, R.P.A three dimensional seismic image of the crust and upper mantle beneath the Kenya riftNature, Vol. 354, No. 6350, November 21, pp. 199-203KenyaMantle, Tectonics -rifting Kenya Rift
DS200612-0338
2006
Green II, H.W.Dobrzhinetskaya, L.F., liu, Z., Cartigny, P., Zhang, J., Tchkhetia, D., Hemley, R.J., Green II, H.W.Synchrotron infrared and Raman spectroscopy of microdiamonds from Erzgebirge, Germany.Earth and Planetary Science Letters, Vol. 248, 1-2, Aug. 15, pp. 325-334.Europe, GermanyMicrodiamonds
DS201412-0834
2014
Greenberg, E.Sinmyo, R., Pesce, G., Greenberg, E., McCammon, C., Dubrovinsky, L.Lower mantle electrical conductivity based on measurements of Al, Fe-bearing perovskite under lower mantle conditions.Earth and Planetary Science Letters, Vol. 393, pp. 165-172.MantleGeophysics
DS201805-0984
2018
Greenberg, E.Tschauner, O., Huang, S., Greenberg, E., Prakapenka, V.B., Ma, C., Rossman, G.R., Shen, A.H., Zhang, D., Newville, M., Lanzirotti, A., Tait, K.Ice-VII inclusions in diamonds: evidence for aqueous fluid in the Earth's deep mantle. Orapa, ShandongScience, Vol. 359, pp. 1136-1139.Africa, South Africa, Botswana, Congo, Sierra Leone, Chinadiamond inclusions
DS202009-1624
2020
Greenberg, E.Dorfman, S.M., Potapkin, V., Lv, M., Greenberg, E., Kupenko, I., Chumakov, A.I., Bi, W., Alp, E.E., Liu, J., Magrez, A., Dutton, S.E., Cava, R.J., McCammon, C.A., Gillet, P.Effects of composition and pressure on electronic states of iron in bridgmanite.American Mineralogist, Vol. 105, pp. 1030-1039. pdfMantleredox

Abstract: Electronic states of iron in the lower mantle's dominant mineral, (Mg,Fe,Al)(Fe,Al,Si)O3 bridgmanite, control physical properties of the mantle including density, elasticity, and electrical and thermal conductivity. However, the determination of electronic states of iron has been controversial, in part due to different interpretations of Mössbauer spectroscopy results used to identify spin state, valence state, and site occupancy of iron. We applied energy-domain Mössbauer spectroscopy to a set of four bridgmanite samples spanning a wide range of compositions: 10-50% Fe/total cations, 0-25% Al/total cations, 12-100% Fe3+/total Fe. Measurements performed in the diamond-anvil cell at pressures up to 76 GPa below and above the high to low spin transition in Fe3+ provide a Mössbauer reference library for bridgmanite and demonstrate the effects of pressure and composition on electronic states of iron. Results indicate that although the spin transition in Fe3+ in the bridgmanite B-site occurs as predicted, it does not strongly affect the observed quadrupole splitting of 1.4 mm/s, and only decreases center shift for this site to 0 mm/s at ~70 GPa. Thus center shift can easily distinguish Fe3+ from Fe2+ at high pressure, which exhibits two distinct Mössbauer sites with center shift ~1 mm/s and quadrupole splitting 2.4-3.1 and 3.9 mm/s at ~70 GPa. Correct quantification of Fe3+/total Fe in bridgmanite is required to constrain the effects of composition and redox states in experimental measurements of seismic properties of bridgmanite. In Fe-rich, mixed-valence bridgmanite at deep-mantle-relevant pressures, up to ~20% of the Fe may be a Fe2.5+ charge transfer component, which should enhance electrical and thermal conductivity in Fe-rich heterogeneities at the base of Earth's mantle.
DS1982-0319
1982
Greenberg, J.K.Keller, G.R., Bland, A.E., Greenberg, J.K.Evidence for a Major Late Precambrian Tectonic Event (rifting?) in the Eastern Midcontinent Region, United States.Tectonics, Vol. 1, No. 2, PP. 213-223.GlobalMid-continent, Peralkaline
DS1983-0266
1983
Greenberg, J.K.Greenberg, J.K., Brown, B.A.Proterozoic Cratonization South of the Superior Province Inwisconsin.Geological Society of America (GSA), Vol. 15, No. 6, P. 586. (abstract.).Wisconsin, United States, Great LakesMid Continent
DS1984-0310
1984
Greenberg, J.K.Greenberg, J.K., Brown, B.A.Cratonic Sedimentation During the Proterozoic; an Orogenic Connection in wisconsin and the Upper Midwest.Journal of GEOLOGY, Vol. 92, No. 2, MARCH PP. 159-172.WisconsinMid-continent
DS201012-0250
2010
Greene, D.C.Greene, D.C.Neoproterozoic rifting in the southern Georgin a Basin, central Australia: implications for reconstructing Australia in Rodinia.Tectonics, Vol. 29, 5, TC5010.AustraliaGeodynamics
DS1989-0541
1989
Greene, L.C.Greene, L.C., Johnson, R.A.Interpretation of gravity and seismic relection dat a beneath the ChalbiEos, Vol. 70, No. 43, October 24, p. 1336. AbstractKenyaTectonics, Rift
DS1991-0604
1991
Greene, L.C.Greene, L.C., Richards, D.R., Johnson, R.A.Crustal structure and tectonic evolution of the Anza rift, northern SOURCE[ TectonophysicsTectonophysics, Vol. 197, No. 2-4, November pp. 203-212KenyaTectonics, Rift system
DS1981-0191
1981
Greene, R.C.Greene, R.C., Plouff, D.Location of a Caldera Source for the Soldier Meadow Tuff, Northwestern Nevada, Indicated by Gravity and Aeromagnetic Data.Geological Society of America (GSA) Bulletin., Vol. 92, No. 1, PP. 4-6, AND FICHE PP. 39-56.GlobalMid-continent, Geophysics
DS201905-1062
2019
Greene, S.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 µm) and diamond hosts formed at temperatures lower than ~1000 °C is not recommended for diamond age determinations.
DS202008-1398
2020
Greene, S.Greene, S., Jacob, D.E., O'Reilly, S.Y., Henry, H., Pinter, Z., Heaman, L.Extensive prekimberlitic lithosphere modification recorded in Jericho mantle xenoliths in kimberlites, Slave Craton.Goldschmidt 2020, 1p. AbstractCanada, Northwest Territoriesdeposit - Jericho

Abstract: Wehrlite and pyroxenite xenoliths and megacrysts from the Jericho kimberlite were analyzed by µXRF and EBSD, and for major elements, trace elements, and isotopes (Pb-Sr- O) in major phases. Thermobarometry places these samples at 60 - 180 km and 600 - 1200 ??C. While modes and textures vary, many samples have olivine-olivine grain boundaries with straight edges and 120° angle junctions, indicating granoblastic recrystallisation, while clinopyroxene and orthopyroxene are complexly intergrown. Clinopyroxene twins and subgrains recording orientations distinct from the encapsulating grain were detected using EBSD and are inferred to represent recent modification processes. Several distinct garnet compositions were measured, with multiple thin garnet rims in some samples suggesting possible successive stages of garnet crystallisation. Complex chromium zoning in garnet is detected by µXRF in several samples (fig.1). Pb-Pb ages for most samples are similar to the age of kimberlite entrainment (173 Ma), but the shallowest pyroxenite sample preserves the most radiogenic Pb composition, intercecting concordia at 0.7 - 1.1 Ga, and is the only sample with d18O above the mantle range (6.2±0.1 ‰). The deepest sample has the lowest d18O (5.5±0.1 ‰) and radiogenic 87Sr/86Sr similar to MARID rocks (0.709±1 ‰). These results suggest the Jericho lithosphere experienced several melt/fluid injection events that modified substantial portions of the sampled section soon before kimberlite entrainment.
DS1982-0098
1982
Greenex, Greenbushes Tin Ltd.Birrell, R.D., Greenex, Greenbushes Tin Ltd., Territory Mining Ltd.El 2842-final Report 1981-1982Northern Territory Open File., No. CR 82-258, 8 P. UNPUBL.Australia, Northern TerritoryHeavy Minerals, Geochemistry, Diamonds, Prospecting
DS1982-0099
1982
Greenex, Greenbushes Tin Ltd.Birrell, R.D., Greenex, Greenbushes Tin Ltd., Territory Mining Ltd.El 2906 Hayes Creek Final Report 1981-1982Northern Territory Geological Survey, No. CR 82/366, 6P.Australia, Northern TerritoryProspecting, Geochemistry
DS1982-0100
1982
Greenex, Greenbushes Tin Ltd.Birrell, R.D., Greenex, Greenbushes Tin Ltd., Territory Mining Ltd.El 2842 Final Report 1981-1982Northern Territory Geological Survey Open File., No. SD5212 5069, 8P.Australia, Northern TerritoryProspecting, Heavy Mineral Sampling
DS1982-0101
1982
Greenex, Greenbushes Tin Ltd.Birrell, R.D., Greenex, Greenbushes Tin Ltd.El 3294 Hayes Creek Annual Report 1982Northern Territory Geological Survey, No. 82/365, 11P.Australia, Northern TerritoryGeochemistry, Prospecting
DS1970-0918
1974
Greenhalgh, P.Greenhalgh, P.An Economic History of the Ghanian Diamond Industry 1919-197Ph.d. Thesis, University Birmingham., 514P.Ghana, West AfricaEconomics, History
DS1985-0250
1985
Greenhalgh, P.Greenhalgh, P.West African Diamonds 1919-1983 - an Economic HistoryManchester University Press, 306P.West Africa, Ghana, Sierra LeoneProduction, Methods
DS1995-0264
1995
Greenhalgh, S.Cao, S., Greenhalgh, S.High resolution seismic tomographic delineation of ore depositsExploration Geophysics ( Australia), Vol. 26, No. 2-3, June 1, pp. 315-318AustraliaGeophysics -seismics, Tomography
DS200612-0557
2005
Greenhalgh, S.Heath, P.J., Greenhalgh, S., Direen, N.G.Modeling gravity and magnetic gradient tensor responses for exploration within the regolith.Exploration Geophysics, Vol. 36, 4, pp. 357-364.AustraliaGeophysics - not specific to diamonds
DS1989-1171
1989
Greenhalgh, S.A.Pant, D.R., Greenhalgh, S.A.Multicomponent seismic reflection profiling over an ore-body structure- a scale model investigationGeophysical Research Letters, Vol. 16, No. 10, October pp. 1089-1092GlobalGeophysics, Seismics -orebody
DS1992-0494
1992
Greenhough, J.D.Fryer, B.J., Greenhough, J.D.Evidence for mantle heterogeneity from platinum group element abundances in Indian-ocean basaltsCanadian Journal of Earth Sciences, Vol. 29, No. 11, November pp. 2329-2340IndiaMantle, Geochemistry
DS1994-0659
1994
Greenhough, J.D.Greenhough, J.D., Fryer, B.J., Owen, J.V.Mantle processes affecting the concentration and distribution of platinum group elements (PGE):information from alkaline magmas.International Symposium Upper Mantle, Aug. 14-19, 1994, Extended abstracts pp. 67-69.NewfoundlandMantle, Alkaline rocks, platinum
DS1996-0564
1996
Greenland Geological SurveyGreenland Geological SurveyGreenland MapGreenland Geological Survey, mapGreenlandMap -ad
DS1997-0442
1997
Greenland Minex News BriefGreenland Minex News BriefPlatinova A/S in the Archean of western Greenland discovers kimberliteboulders.Greenland Minex News Brief, 1/4p. and mapGreenlandNews item, Platinova A/S.
DS1960-0553
1965
Greenman, L.Greenman, L.Preliminary Report on the Geology of the Luderitz AreaPrecamb. Res. Unit, University Cape Town , Annual Report 3rd., PP. 16-19.Southwest Africa, NamibiaGeology
DS1960-1115
1969
Greenman, L.Greenman, L.The Elizabeth Bay Formation, Luderitz, and its Bearing on The Genesis of Dolomite.Geological Society of South Africa Transactions, Vol. 72, No. 3, PP. 115-121.Southwest Africa, NamibiaGeology, Sedimentology
DS1987-0458
1987
Greenough, J.D.McHone, J.G., Ross, M.E., Greenough, J.D.Mesozoic dyke swarms of eastern North Americain: Mafic dyke swarms, editors, Halls, H.C., Fahrig, W.F., Geological, Special Paper 34, pp. 279-288GlobalQuebec- Camptonite, Monchiquite, Montregian Hills p. 28
DS1988-0267
1988
Greenough, J.D.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
DS1989-1158
1989
Greenough, J.D.Owen, J.V., Greenough, J.D., Bellefontaine, K.A.Preservation of primary geochemical signatures in polymetamorphosedtholeite: the Long Range dyke swarm,Newfoundland, CanadaLithos, Vol. 24, No. 1, December pp. 55-64NewfoundlandTholeite, Long Range dyke swarm
DS1992-0607
1992
Greenough, J.D.Greenough, J.D., Ruffman, A.Noble metal concentrations in shoshonitic lamprophyres: the Weekend Meguma terrane, Nova ScotiaGeological Association of Canada (GAC) Abstracts Volume, Vol. 17, p. A43. abstract onlyNova ScotiaShoshonite, Lamprophyre
DS1993-0575
1993
Greenough, J.D.Greenough, J.D., Owen, J.V., Ruffman, A.Noble metal concentrations in shoshonitic lamprophyres -analysis of the weekend dykes, eastern shore, Nova Scotia, Canada.Journal of Petrology, Vol. 34, No.6, December pp. 1247-1269.Nova ScotiaLamprophyres, Shoshonites
DS1993-0576
1993
Greenough, J.D.Greenough, J.D., Owen, J.V., Ruffman, A.Noble metal concentrations in shoshonitic lamprophyres: analysis of the weekend Dykes, eastern shore, Nova ScotiaJournal of Petrology, Vol. 34, No. 4, December pp. 1247-1270Nova ScotiaShoshonites, Gold, silver, platinum group elements (PGE)
DS1995-0678
1995
Greenough, J.D.Greenough, J.D., Owen, J.V.The role of subcontinental lithospheric mantle in massif type anorthositepetrogenesis:jotunitic Red BaySchweiz. Mineral. Petrogr. Mitt, Vol. 75, pp. 1-15Labrador, Quebec, UngavaProterozoic -Middle, Anorthosite -Massif-type
DS2003-0498
2003
Greenough, J.D.Greenough, J.D., Kyser, K.Contrasting Archean and Proterozoic lithospheric mantle: isotopic evidence from theContributins to Mineralogy and Petrology, Vol. 145, 2, May pp. 169-181.MontanaGeochronology - WYMAP alkaline province
DS2003-0499
2003
Greenough, J.D.Greenough, J.D., Kyser, T.K.Contrasting Archean and Proterozoic lithospheric mantle: isotopic evidence from theContributions to Mineralogy and Petrology, Vol. 145, 2, pp. 169-181.MontanaBlank
DS200412-0716
2003
Greenough, J.D.Greenough, J.D., Kyser, T.K.Contrasting Archean and Proterozoic lithospheric mantle: isotopic evidence from the Shonkin Sag sill (Montana).Contributions to Mineralogy and Petrology, Vol. 145, 2, pp. 169-181.United States, MontanaGeochronology
DS200512-0076
2005
Greenough, J.D.Benz, D.M., Fipke, C.E., Greenough, J.D.Preliminary LAM-ICP-MS analysis of diamond indicator silicate minerals in the PAnd a and New Eland kimberlite pipes.GAC Annual Meeting Halifax May 15-19, Abstract 1p.Canada, Northwest Territories, Africa, South AfricaMineral chemistry
DS200512-0365
2005
Greenough, J.D.Greenough, J.D., Dostal, J., Mallory-Greenough, L.M.Igneous rock association- pt. 4 Oceanic volcanism 1 mineralogy and petrology.Geoscience Canada, Vol. 32, 1, March pp. 29-45.MantleHotspots, tectonics, basalts
DS201805-0948
2018
Greenough, J.D.Greenough, J.D., McDivitt, J.A.Earth's evolving subcontinental lithospheric mantle: inferences from LIP continental flood basalt geochemistry.International Journal of Earth Sciences, Vol. 107, 3, pp. 787-810.Mantlegeochemistry

Abstract: Archean and Proterozoic subcontinental lithospheric mantle (SLM) is compared using 83 similarly incompatible element ratios (SIER; minimally affected by % melting or differentiation, e.g., Rb/Ba, Nb/Pb, Ti/Y) for >3700 basalts from ten continental flood basalt (CFB) provinces representing nine large igneous provinces (LIPs). Nine transition metals (TM; Fe, Mn, Sc, V, Cr, Co, Ni, Cu, Zn) in 102 primitive basalts (Mg# = 0.69-0.72) from nine provinces yield additional SLM information. An iterative evaluation of SIER values indicates that, regardless of age, CFB transecting Archean lithosphere are enriched in Rb, K, Pb, Th and heavy REE(?); whereas P, Ti, Nb, Ta and light REE(?) are higher in Proterozoic-and-younger SLM sources. This suggests efficient transfer of alkali metals and Pb to the continental lithosphere perhaps in association with melting of subducted ocean floor to form Archean tonalite-trondhjemite-granodiorite terranes. Titanium, Nb and Ta were not efficiently transferred, perhaps due to the stabilization of oxide phases (e.g., rutile or ilmenite) in down-going Archean slabs. CFB transecting Archean lithosphere have EM1-like SIER that are more extreme than seen in oceanic island basalts (OIB) suggesting an Archean SLM origin for OIB-enriched mantle 1 (EM1). In contrast, OIB high U/Pb (HIMU) sources have more extreme SIER than seen in CFB provinces. HIMU may represent subduction-processed ocean floor recycled directly to the convecting mantle, but to avoid convective homogenization and produce its unique Pb isotopic signature may require long-term isolation and incubation in SLM. Based on all TM, CFB transecting Proterozoic lithosphere are distinct from those cutting Archean lithosphere. There is a tendency for lower Sc, Cr, Ni and Cu, and higher Zn, in the sources for Archean-cutting CFB and EM1 OIB, than Proterozoic-cutting CFB and HIMU OIB. All CFB have SiO2 (pressure proxy)-Nb/Y (% melting proxy) relationships supporting low pressure, high % melting resembling OIB tholeiites, but TM concentrations do not correlate with % melting. Thus, the association of layered intrusion (plutonic CFB) TM deposits with Archean terranes does not appear related to higher metal concentrations or higher percentages of melting in Archean SLM. Other characteristics of these EM1-like magmas (e.g., S2 or O2 fugacity) may lead to element scavenging and concentration during differentiation to form ore deposits.
DS200712-0898
2006
Greenroyd, C.J.Rodger, M., Watts, A.B., Greenroyd, C.J., Peirce, C., Hobbs, R.W.Evidence for unusually thin oceanic crust and strong mantle beneath the Amazon Fan.Geology, Vol. 34, 12, pp. 1081-1084.South AmericaGeophysics - seismics
DS1970-0730
1973
Greenshields, R.Joynt, R.H., Greenshields, R., Hodgen, R.Advances in Sea and Beach Diamond Mining TechniquesMining Engineering Journal of South Africa, Vol. No. APRIL, PP. 25-49.Southwest Africa, NamibiaSubmarine Diamond Placers, Marine Diamond Corporation, Sampling
DS200812-0916
2008
Greentree, A.D.Prawer, S., Greentree, A.D.Diamond for quantum computing.Science, Vol. 320, 5883, June 20, p. 1601-2.TechnologyComputers
DS2002-0612
2002
Greenwell, B.Greenwell, B.The search for diamonds and PGMs builds momentumProspectors and Developers Association of Canada (PDAC) Exploration and, pp. 12-4.OntarioNews item - brief review, platinum group metals
DS1999-0617
1999
GreenwoodRuzicka, A., Riciputi, Taylor, Snyder, GreenwoodPetrogenesis of mantle derived sulphide inclusions in Yakutian diamonds: chemical and isotopic disequilibriuM.7th International Kimberlite Conference Nixon, Vol. 2, pp. 741-49.Russia, YakutiaQuenching from high temperatures, Deposit - Mir, 23rd., Aikhal, Udachnaya
DS1995-0679
1995
Greenwood, D.R.Greenwood, D.R., Wing, S.L.Eocene continental climates and latitudinal temperature gradientsGeology, Vol. 23, No. 11, Nov. pp. 1044-1048GlobalPaleoclimate
DS201710-2278
2017
Greenwood, D.R.Wolfe, A.P., Reyes, A.V., Royer, D.L., Greenwood, D.R., Doria, G., Gagen, M.H., Siver, P.A., Westgate, J.A.Middle Eocene CO2 and climate reconstructed from the sediment fill of a subarctic kimberlite Maar.Geology , Vol. 45, 7, pp. 619-622.Canada, Northwest Territoriesdeposit - Giraffe

Abstract: Eocene paleoclimate reconstructions are rarely accompanied by parallel estimates of CO2 from the same locality, complicating assessment of the equilibrium climate response to elevated CO2. We reconstruct temperature, precipitation, and CO2 from latest middle Eocene (ca. 38 Ma) terrestrial sediments in the posteruptive sediment fill of the Giraffe kimberlite in subarctic Canada. Mutual climatic range and oxygen isotope analyses of botanical fossils reveal a humid-temperate forest ecosystem with mean annual temperatures (MATs) more than 17 °C warmer than present and mean annual precipitation ~4× present. Metasequoia stomatal indices and gas-exchange modeling produce median CO2 concentrations of ~630 and ~430 ppm, respectively, with a combined median estimate of ~490 ppm. Reconstructed MATs are more than 6 °C warmer than those produced by Eocene climate models forced at 560 ppm CO2. Estimates of regional climate sensitivity, expressed as ?MAT per CO2 doubling above preindustrial levels, converge on a value of ~13 °C, underscoring the capacity for exceptional polar amplification of warming and hydrological intensification under modest CO2 concentrations once both fast and slow feedbacks become expressed.
DS201712-2722
2017
Greenwood, D.R.Reyes, A.V., Wolfe, A.P., Tierney, J.E., Silver, P.A., Royer, D.L., Greenwood, D.R., Buryak, S., Davies, J.H.F.L.Paleoenvironmental research on early Cenozoic sediment fills in Lac de Gras kimberlite pipes: progress and prospects.45th. Annual Yellowknife Geoscience Forum, p. 65 abstractCanada, Northwest Territoriesdeposit - Giraffe

Abstract: Several Lac de Gras kimberlite pipes host thick accumulations of stratified post-eruptive lacustrine sediment and peat. Given the range of Lac de Gras kimberlite emplacement ages, these fills - though rare - provide a unique sedimentary archive of paleoenvironments during the sustained Early Cenozoic “greenhouse” interval, in a high-latitude region otherwise devoid of Phanerozoic sediment cover. Extensive exploration drilling has provided a valuable window into this unique sedimentary record, which would have otherwise remained covered by Quaternary glacial deposits. Our focus to date has been multidisciplinary study of the Giraffe pipe sediment fill: an ~80 m-thick sequence of post-eruptive lacustrine silt overlain by peat, which paints a remarkable picture of a humid-temperate Middle Eocene forest ecosystem on the Canadian Shield. Post-eruptive chronology is provided by interbedded distal tephra horizons, likely sourced from Alaska, that have been dated by glass fission-track and zircon U-Pb techniques. Paleoclimate proxies derived from pollen, wood cellulose oxygen isotopes, and biomarkers converge on reconstructed mean annual temperatures >17 °C warmer than present, with mean winter temperatures above freezing, and mean annual precipitation ~4x present. Two independent reconstructions of CO2 from well preserved conifer foliage suggest that this warming occurred under relatively modest atmospheric CO2 concentrations of 430-630 ppm. These findings provide direct field-based evidence for dramatic past arctic warming at CO2 concentrations that were well within the range of projections under “business-as-usual” emissions scenarios, underscoring the capacity for exceptional polar amplification of climate change under modest CO2 concentrations once both fast and slow feedbacks processes become expressed. Our studies at Giraffe pipe also highlight the scientific value of archived exploration drill core in the Lac de Gras kimberlite field, particularly with respect to pipes that are unremarkable for the purpose of diamond exploration.
DS1988-0429
1988
Greenwood, H.J.Mader, U.K., Greenwood, H.J.Carbonatites and related rocks of the Prince and George Claims Northern Rocky MountainsBritish Columbia Department of Mines, Geological Fieldwork 1987, Paper 1988-1, pp. 375-380British ColumbiaBlank
DS1989-0542
1989
Greenwood, H.J.Greenwood, H.J.On models and modelingCanadian Mineralogist, Vol. 27, pt. 1, March pp. 1-14GlobalBasalt-eclogite, Petrology
DS1970-0953
1974
Greenwood, H.L.Littlejohn, A.L., Greenwood, H.L.Lherzolite Nodules in Basalts from British ColumbiaCanadian Journal of Earth Sciences, Vol. 11, PP. 1288-1308.Canada, British ColumbiaXenoliths
DS1998-0531
1998
Greenwood, J.C.Greenwood, J.C., Gibson, S.A., Thompson, R.N., WeskaPetrogenesis of Cretaceous kimberlites from the Paranatinga region, centralBrasil.7th International Kimberlite Conference Abstract, pp. 268-270.BrazilGeochemistry, petrology, Deposit - Paratinga
DS1993-1761
1993
Greenwood, P.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
DS1991-1312
1991
Greenwood, P.B.Pearson, D.G., Davies, G.R., Nixon, P.H., Greenwood, P.B.Oxygen isotope evidence for the origin of pyroxenites in the Beni Bousera peridotite massif, North Morocco: derivation from subducted oceaniclithosphereEarth and Planetary Science Letters, Vol. 102, No. 3/4, March pp. 289-301MoroccoGeochemistry, Ophiolite - Beni Bousera
DS1970-0486
1972
Greenwood, P.G.Burley, A.J., Greenwood, P.G.Geophysical Surveys over Kimberlite Pipes in LesothoInstitute of Geological Sciences GEOPHYS. DIV., I.G.S. 540 1009/72, 32P.LesothoKimberlite, Geophysics
DS1981-0192
1981
Greenwood, R.Greenwood, R., Gottliebsen, R.Cra and Ashton Crack Down on Northern MiningBusiness Review., JULY 24TH. PP. 11-12.Australia, Western AustraliaHistory, Company Investment
DS200512-0366
2004
Greff-Lefftz, M.Greff-Lefftz, M.Upwelling plumes, superswells and true polar wander.Geophysical Journal International, Vol. 159, 3, pp. 1125-1137.MantlePlume
DS200612-0778
2006
Greff-Lefftz, M.Le Mouel, J.L., Narteau, C., Greff-Lefftz, M., Holschneider, M.Dissipation at the core mantle boundary on a small scale topography.Journal of Geophysical Research, Vol. 111, 10p. B04413MantleCMB - friction
DS201012-0639
2010
Greff-Lefftz, M.Rouby, H., Greff-Lefftz, M., Besse, J.Mantle dynamics, geoid, inertia and TPW since 120 Myr.Earth and Planetary Science Letters, Vol. 292, 3-4, pp. 301-311.MantleGeodynamics
DS201412-0661
2014
Greff-Lefftz, M.Panet, I., Pajot-Metivier, G., Greff-Lefftz, M., Metivier, L., Diament, M.Mapping the mass distribution of Earth's mantle using satellite-derived gravity gradients.Nature Geoscience, Vol. 7, 2, Feb. pp. 131-135.MantleGeophysics - tomography
DS201610-1887
2016
Greff-Lefftz, M.Metivier, L., Caron, L., Greff-Lefftz, M., Pajot-Metivier, G., Fleitout, L., Rouby, H.Evidence for Post glacial signatures in gravity gradients: a clue in lower mantle viscosity. ( Hudson bay region)Earth and Planetary Science Letters, Vol. 453, pp. 146-156.Canada, OntarioGravity

Abstract: The Earth's surface was depressed under the weight of ice during the last glaciations. Glacial Isostatic Adjustment (GIA) induces the slow recession of the trough that is left after deglaciation and is responsible for a contemporary uplift rate of more than 1 cm/yr around Hudson Bay. The present-day residual depression, an indicator of still-ongoing GIA, is difficult to identify in the observed topography, which is predominantly sensitive to crustal heterogeneities. According to the most widespread GIA models, which feature a viscosity of on top of the lower mantle, the trough is approximately 100 m deep and cannot explain the observed gravity anomalies across North America. These large anomalies are therefore usually attributed to subcontinental density heterogeneities in the tectosphere or to slab downwelling in the deep mantle.
DS201805-0989
2018
Greff-Lefftz, M.Vincente de Gouveia, S., Besse, J., Frizon de Lamotte, D., Greff-Lefftz, M., Lescanne, M., Gueydan, F., Leparmentier, F.Evidence of hot spot paths below Arabia and the Horn of Africa and consequences on the Red Sea opening.Earth Planetary Science Letters, Vol. 487, pp. 210-220.Africatectonics

Abstract: Rifts are often associated with ancient traces of hotspots, which are supposed to participate to the weakening of the lithosphere. We investigated the expected past trajectories followed by three hotspots (Afar, East-Africa and Lake-Victoria) located around the Red Sea. We used a hotspot reference frame to compute their location with respect to time, which is then compared to mantle tomography interpretations and geological features. Their tracks are frequently situated under continental crust, which is known to strongly filter plume activity. We looked for surface markers of their putative ancient existence, such as volcanism typology, doming, and heat-flow data from petroleum wells. Surface activity of the East-Africa hotspot is supported at 110 Ma, 90 Ma and 30 Ma by uplift, volcanic activity and rare gas isotopic signatures, reminiscent of a deep plume origin. The analysis of heat-flow data from petroleum wells under the Arabian plate shows a thermal anomaly that may correspond to the past impact of the Afar hotspot. According to derived hotspot trajectories, the Afar hotspot, situated (at 32 Ma) 1000 km north-east of the Ethiopian-Yemen traps, was probably too far away to be accountable for them. The trigger of the flood basalts would likely be linked to the East-Africa hotspot. The Lake-Victoria hotspot activity appears to have been more recent, attested only by Cenozoic volcanism in an uplifted area. Structural and thermal weakening of the lithosphere may have played a major role in the location of the rift systems. The Gulf of Aden is located on inherited Mesozoic extensional basins between two weak zones, the extremity of the Carlsberg Ridge and the present Afar triangle, previously impacted by the East-Africa hotspot. The Red Sea may have opened in the context of extension linked to Neo-Tethys slab-pull, along the track followed by the East Africa hotspot, suggesting an inherited thermal weakening.
DS1999-0262
1999
Gregersen, S.Gregersen, S., et al.Important findings expected from Europe's largest seismic arrayEos, Vol. 80, No. 1, Jan. 5, pp. 1, 6.EuropeGeophysics - seismics
DS200412-0406
2004
Gregersen, S.Darbyshire, F.A., Larsen, T.B., Mosegaard, K., Dahl Jensen, T., Gudmundsson, O., Bach, T., Gregersen, S., PedeA first detailed look at the Greenland lithosphere and upper mantle; using Rayleigh wave tomography.Geophysical Journal International, Vol. 158, 1, pp. 267-286.Europe, GreenlandGeophysics - seismic
DS200612-1491
2006
Gregersen, S.Voss, P., Mosegaard, K., Gregersen, S., TORThe Tornquist Zone, north east inclining lithospheric transition at the south western margin of the Baltic Shield: revealed through a nonlinear teleseismic tomographic inversion.Tectonophysics, Vol. 416, 1-4, April 5, pp. 151-166.Europe, Baltic ShieldGeophysics - seismics
DS2000-0478
2000
Gregg, J.M.Keller, T.J., Gregg, J.M., Shelton, K.L.Fluid migration and associated diagenesis in the Greater Reelfoot Rift region Midcontinent United StatesGeological Society of America (GSA) Bulletin., Vol. 112, No. 11, Nov. pp. 1680-93.Arkansas, MidcontinentCraton, Rifting - not specific to diamonds
DS201212-0260
2012
Gregg, P.M.Gregg, P.M., De Silva, S.L., Grosfils, E.B., Parmigiani, J.P.Catastrophic caldera forming eruptions: thermomechanics and implications for eruption triggering and maximum caldera dimensions on Earth.Journal of Volcanology and Geothermal Research, Vol. 242-242, pp. 1-12.MantleCalderas
DS201605-0885
2016
Gregg, P.M.Pritchard, M.E., Gregg, P.M.Enigmatic relationship between silicic and volcanic and plutonic rocks: geophysical evidence for silicic crustal melt in the continents: where. What kind, and how much?Elements, Vol. 12, pp. 121-127.TechnologyGeophysics
DS1993-0577
1993
Gregg, W.J.Gregg, W.J.Structural geology of parautochthonous and allochthonous terranes of Penokean Orogeny comparisons with Northern Appalachian tectonicsUnited States Geological Survey (USGS) Bulletin, No. B 1904 -Q, 28p. $ 2.50MichiganStructure, Baraga Belt
DS1993-0578
1993
Gregg, W.J.Gregg, W.J.Structural geology of parautochthonous and allochthonous terranes of the Penokean OrogenyU.s. Geological Survey Bulletin, No. 1904, 26pMichiganTectonics, Penokean Orogeny
DS1999-0263
1999
Greggs, D.H.Greggs, D.H., Hein, F.J.Lineaments and basement tectonics in the Western Canada sedimentary basin8th. Calgary Mining forum, 1p. abstractSaskatchewan, AlbertaCraton, Tectonics - lineaments
DS2001-0758
2001
GregoireMcInnes, 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
DS2001-0788
2001
GregoireMoine, B., Gregoire, Cottin, Sheppard, O'Reilly, GiretVolatile bearing ultramafic to mafic xenoliths from the Kerugelen Archipelago: evidence for carbonatites...Journal of South African Earth Sciences, Vol. 32, No. 1, p. A 25. (abs)Indian Ocean, mantleCarbonatite, Kerugelen Archipelago
DS1993-0422
1993
Gregoire, D.C.Evans, N.J., Gregoire, D.C.Use of platinum group elements for impactor identification terrestrial impact craters and Cretaceous Tertiary boundaryGeochimica et Cosmochimica Acta, Vol. 57, No.15, pp. 3737-3748GlobalImpact craters, platinum group elements (PGE)
DS1994-0497
1994
Gregoire, D.C.Evans, N.J., Gregoire, D.C., Goodfellow, W.D., Miles, N., VeizerThe Cretaceous Tertiary fireball layer, ejecta layer and coal seam: platinum group elements (PGE) content and mineralogy of size fractionsUnknown, pp. 223-235Alberta, Italy, New Zealand, Denmark, Colorado, WyomingPlatinum Group Elements, K-T boundary
DS1999-0325
1999
Gregoire, M.Ionov, D.A., Gregoire, M., Prikhodko, V.S.Feldspar Ti Oxide metasomatism in off cratonic continental and oceanic upper mantle.Earth and Planetary Science Letters, Vol.165, No.1, Jan.15, pp.37-44.MantleMetasomatism
DS2001-0410
2001
Gregoire, M.Gregoire, M., Jackson, I., O'Reilly, S.Y., Cottin, J.Y.The lithospheric mantle beneath Kerguelen Islands: petrological and petrophysical characteristics....Contributions to Mineralogy and Petrology, Vol. 142, No. 2, Nov. pp. 244-59.Indian Ocean, Kerguelen IslandsMantle mafic rock types - correlation with profiles, Geophysics - seismics
DS2001-0411
2001
Gregoire, M.Gregoire, M., McInnes, B.I.A., O'Reilly, S.Y.Hydrous metasomatism of oceanic sub-arc mantle, Pt. 2. trace element characteristics of slab derived fluids.Lithos, Vol. 59, No. 3, Nov. pp. 91-108.Papua New GuineaMantle metasomatism -Lihir
DS2002-0613
2002
Gregoire, M.Gregoire, M., Bell, D.R., Le Roex, A.P.Trace element geochemistry of phlogopite rich mafic mantle xenoliths: their classification and relationshipContributions to Mineralogy and Petrology, Vol. 142, No. 5, Feb. pp. 603-25.MantlePeridotites, kimberlites - phlogopite bearing, Kimberlites
DS2002-1295
2002
Gregoire, M.Rabinowicz, M., Ricard, Y., Gregoire, M.Compaction in a mantle with a very small melt concentration: implications for theEarth and Planetary Science Letters, Vol. 203, 1, pp. 205-220.MantleMagmatism, Carbonatite, Geochemistry
DS2003-0094
2003
Gregoire, M.Bell, D.R., Gregoire, M., Grove, T.L., Chatterjee, N.D., Bowring, S.A.Silica and carbon deposition in Kimberley peridotites8 Ikc Www.venuewest.com/8ikc/program.htm, Session 6, AbstractSouth AfricaMantle petrology, Deposit - Bultfontein
DS2003-0292
2003
Gregoire, M.Coussaert, N., Gregoire, M., Mercier, J.C.C., Bell, D.R., Demaiffe, D., Le RoexThe origin of clinopyroxene in cratonic mantle8ikc, Www.venuewest.com/8ikc/program.htm, Session 4, POSTER abstractSouth AfricaMantle geochemistry, Deposit - Bultfontein, Jagersfontein, Monastery, Premie
DS2003-0500
2003
Gregoire, M.Gregoire, M., Bell, D.R., LeRoex, A.P.Garnet lherzolites from the Kaapvaal Craton ( South Africa): trace element evidence forJournal of Petrology, Vol. 44, 4, pp. 629-58.South AfricaMineralogy, Metasomatism
DS200412-0127
2003
Gregoire, M.Bell, D.R., Gregoire, M., Grove, T.L., Chatterjee, N.D., Bowring, S.A.Silica and carbon deposition in Kimberley peridotites.8 IKC Program, Session 6, AbstractAfrica, South AfricaMantle petrology Deposit - Bultfontein
DS200412-0437
2004
Gregoire, M.Delpech, G., Gregoire, M., O'Reilly, S.Y., Cottin, J.Y., Moine, B., Michon, G., Giret, A.Feldspar from carbonate rich silicate metasomatism in the shallow oceanic mantle under Kerguelen Islands ( South Indian Ocean).Lithos, Vol. 75, 1-2, July pp. 209-237.Kerguelen IslandsMetasomatism, trace element fingerprinting, petrogeneti
DS200412-0717
2003
Gregoire, M.Gregoire, M., Bell, D.R., LeRoex, A.P.Garnet lherzolites from the Kaapvaal Craton ( South Africa): trace element evidence for a metasomatic history.Journal of Petrology, Vol. 44,4,pp. 629-58.Africa, South AfricaMineralogy Metasomatism
DS200412-1173
2004
Gregoire, M.Lorand, J.P., Delpech, G., Gregoire, M., Moine, B., O'Reilly, S.Y., Cottin, J.Y.Platinum group elements and the multistage metasomatic history of Kerguelen lithospheric mantle ( South Indian Ocean).Chemical Geology, Vol. 208, 1-4, pp. 195-215.Indian OceanMetasomatism, carbonatite
DS200412-1349
2004
Gregoire, M.Moine, B.N., Gregoire, M., O'Reilly, S.Y., Delpech, G., Sheppard, S.M.F., Lorand, J.P., Renac, Giret, CottinCarbonatite melt in oceanic upper mantle beneath the Kerguelen Archipelago.Lithos, Vol. 75, pp. 239-252.Kerguelen IslandsCarbonatite, harzburgite, metasomatism
DS200512-0367
2005
Gregoire, M.Gregoire, M., Tinguely, C., Bell, D.R., Le Roex, A.P.Spinel lherzolite xenoliths from the Premier kimberlite ( Kaapvaal craton) South Africa: nature and evolution of the shallow upper mantle beneath Bushveld Complex.Lithos, Vol. 84, 3-4, Oct. pp. 185-205.Africa, South AfricaPetrology - Premier, melting, metasomatism
DS200612-0115
2005
Gregoire, M.Bell, D.R., Gregoire, M., Grove, T.L., Chaterjee, N., Carlson, R.W., Buseck, P.R.Silica and volatile element metasomatism of Archean mantle: a xenolith scale example from the Kaapvaal Craton.Contributions to Mineralogy and Petrology, Vol. 150, 3, pp. 251-267.Africa, South AfricaMetasomatism
DS200612-0496
2005
Gregoire, M.Gregoire, M., Rabonowicz, M., Janse, A.J.A.Mantle mush compaction: a key to understand the mechanisms of concentration of kimberlite melts and initiation of swarms of kimberlite dykes.Journal of Petrology, Vol. 47, 3, March, pp. 631-646,Africa, South Africa, Lesotho, BotswanaConvection, Kimberley, Rietfontein, Central Cape,Gibeon
DS200612-1086
2006
Gregoire, M.Petitjean, S., Rabinowicz, M., Gregoire, M., Chevrot, S.Differences between Archean and Proterozoic lithospheres: assessment of the possible major role of thermal conductivity.Geochemistry, Geophysics, Geosystems: G3, Vol. 7, Q03021 10.1029/2005 GC001053MantleGeothermometry
DS200712-0196
2007
Gregoire, M.Coltorti, M., Bonadiman, C., Faccini, B., Gregoire, M., OReilly, S.Y., Powell, W.Amphiboles from supra subduction and intraplate lithospheric mantle.Lithos, Vol. 99, 1-2, pp. 68-84.MantleSubduction
DS200812-0046
2008
Gregoire, M.Arndt, N.T., Coltice, N., Helstaedt, H., Gregoire, M.Origin of Archean subcontinental lithospheric mantle: some petrological constraints.Lithos, In press available 47p.CanadaArchean - craton
DS200812-0230
2008
Gregoire, M.Coltori, M., Gregoire, M.Metasomatism in oceanic and continental lithospheric mantle: introduction.Geological Society of London, Special Publications no. 293, pp. 1-10.MantleMetasomatism
DS200912-0122
2009
Gregoire, M.Coltorti, M., Downes, H., Gregoire, M., O'Reilly, S.Y., Beccaluva, L., Bonadiman, Piccardo.Rivalenti, SienaPetrological evolution of the European lithospheric mantle: from Archean to present day.Journal of Petrology, Vol. 50, no. 7, pp. 1181-1184.MantleMagmatism
DS200912-0763
2008
Gregoire, M.Tinguely, C.E., Gregoire, M., LeRoex, A.P.Eclogite and pyroxenite xenoliths from off craton kimberlites near the Kaapvaal Craton, South Africa.Comptes Rendus Geoscience, Vol. 340, 12, pp. 811-812.Africa, South AfricaMineral chemistry
DS201012-0114
2010
Gregoire, M.Coltori, M., Downes, H., Gregoire, M., O'Reilly, S.Y.Petrological evolution of the European lithospheric mantle: introduction.Geological Society of London Special Publication, No. 337, pp. 1-5.EuropeMantle petrology
DS201012-0115
2009
Gregoire, M.Coltori, M., Gregoire, M.One page overview of papers in Elements August 2010, p. 268. papers from this book are not listed.Metasomatism in oceanic and continental lithospheric mantle, Geological Society Special Publication, 293, 361p.MantleBook - mantle metasomatism
DS201312-0713
2013
Gregoire, M.Poitrasson, F., Delpech, G., Gregoire, M.On the iron isotope heterogeneity of lithospheric mantle xenoliths: implications for mantle metasomatism, the origin of basalts and the iron isotope composition of the Earth.Contributions to Mineralogy and Petrology, Vol. 165, 6, pp. 1243-1258.Africa, Cameroon, South AfricaMelting
DS201509-0396
2015
Gregoire, M.France, L., Chazot, G., Kornprobst, J., Dallai, L., Vannucci, R., Gregoire, M., Bertrand, H., Boivin, P.Mantle refertilization and magmatism in old orogenic regions: the role of late-orogenic pyroxenites.Lithos, Vol. 232, pp. 49-75.Africa, Morocco, Cameroon, Jordan, Europe, FranceXenoliths

Abstract: Pyroxenites and garnet pyroxenites are mantle heterogeneities characterized by a lower solidus temperature than the enclosing peridotites; it follows that they are preferentially involved during magma genesis. Constraining their origin, composition, and the interactions they underwent during their subsequent evolution is therefore essential to discuss the sources of magmatism in a given area. Pyroxenites could represent either recycling of crustal rocks in mantle domains or mantle originated rocks (formed either by olivine consuming melt-rock reactions or by crystal fractionation). Petrological and geochemical (major and trace elements, Sr-Nd and O isotopes) features of xenoliths from various occurrences (French Massif-Central, Jordan, Morocco and Cameroon) show that these samples represent cumulates crystallized during melt percolation at mantle conditions. They formed in mantle domains at pressures of 1-2 GPa during post-collisional magmatism (possibly Hercynian for the French Massif-Central, and Panafrican for Morocco, Jordan and Cameroon). The thermal re-equilibration of lithospheric domains, typical of the late orogenic exhumation stages, is also recorded by the samples. Most of the samples display a metasomatic overprint that may be either inherited or likely linked to the recent volcanic activity that occurred in the investigated regions. The crystallization of pyroxenites during late orogenic events has implications for the subsequent evolution of the mantle domains. The presence of large amounts of mantle pyroxenites in old orogenic regions indeed imparts peculiar physical and chemical characteristics to these domains. Among others, the global solidus temperature of the whole lithospheric domain will be lowered; in turn, this implies that old orogenic regions are refertilized zones where magmatic activity would be enhanced.
DS201709-1998
2017
Gregoire, M.Henry, H., Afonso, J.C., Satsukawa, T., Griffin, W.L., O'Reilly, S.Y., Kaczmarek, M-A., Tilhac, R., Gregoire, M., Ceuleneer, G.The unexplored potential impact of pyroxenite layering on upper mantle seismic properties.Goldschmidt Conference, abstract 1p.Europe, Spain, United States, Californiageophysics - seismics

Abstract: It is now accepted that significant volumes of pyroxenites are generated in the subduction factory and remain trapped in the mantle. In ophiolites and orogenic massifs the geometry of pyroxenite layers and their relationships with the host peridotite can be observed directly. Since a large part of what is known about the upper mantle structure is derived from the analysis of seismic waves, it is crucial to integrate pyroxenites in the interpretations. We modeled the seismic properties of a peridotitic mantle rich in pyroxenite layers in order to determine the impact of layering on the seimsic properties. To do so, EBSD data on deformed and undeformed pyroxenites from the Cabo Ortegal complex (Spain) and the Trinity ophiolite (California, USA) respectively are combined with either A or B-type olivine fabrics in order to model a realistic pyroxenite-rich upper mantle. Consideration of pyroxeniterich domains within the host mantle wall rock is incorporated in the calculations using the Schoenberg and Muir group theory [1]. This quantification reveals the complex dependence of the seismic signal on the deformational state and relative abundance of each mineral phase. The incorporation of pyroxenites properties into geophysical interpretations in understanding the lithospheric structure of subduction zones will lead to more geologically realistic models.
DS202002-0219
2020
Gregoire, M.Tilhac, R., Oliveira, B., Griffin, W.L., O'Reilly, S.Y., Schaefer, B.F., Alard, O., Ceuleneer, G., Afonso, J.C., Gregoire, M.Reworking of old continental lithosphere: unradiogenic Os and decoupled Hf-Nd isotopes in sub-arc mantle pyroxenites.Lithos, Vol. 354-355, 19p. pdfEurope, Spainpyroxenites

Abstract: Mantle lithologies in orogenic massifs and xenoliths commonly display strikingly different Hf- and Nd-isotope compositions compared to oceanic basalts. While the presence of pyroxenites has long been suggested in the source region of mantle-derived magmas, very few studies have reported their combined HfNd isotope compositions. We here report the first LuHf data along with ReOs data and S concentrations on the Cabo Ortegal Complex, where the pyroxenite-rich Herbeira massif has been interpreted as remnants of a delaminated arc root. The pyroxenites, chromitites and their host harzburgites show a wide range of whole-rock 187Re/188Os and 187Os/188Os (0.16-1.44), indicating that Re was strongly mobilized, partly during hydrous retrograde metamorphism but mostly during supergene alteration that preferentially affected low-Mg#, low Cu/S pyroxenites. Samples that escaped this disturbance yield an isochron age of 838 ± 42 Ma, interpreted as the formation of Cabo Ortegal pyroxenites. Corresponding values of initial 187Os/188Os (0.111-0.117) are relatively unradiogenic, suggesting limited contributions of slab-derived Os to primitive arc melts such as those parental to these pyroxenites. This interpretation is consistent with radiogenic Os in arc lavas being mostly related to crustal assimilation. Paleoproterozoic to Archean Os model ages confirm that Cabo Ortegal pyroxenites record incipient volcanic arc magmatism on the continental margin of the Western African Craton, as notably documented by zircon UPb ages of 2.1 and 2.7 Ga. LuHf data collected on clinopyroxene and amphibole separates and whole-rock samples are characterized by uncorrelated 176Lu/177Hf and 176Hf/177Hf (0.2822-0.2855), decoupled from Nd-isotope compositions. This decoupling is ascribed to diffusional disequilibrium during melt-peridotite interaction, in good agreement with the results of percolation-diffusion models simulating the interaction of an arc melt with an ancient melt-depleted residue. These models notably show that HfNd isotopic decoupling such as recorded by Cabo Ortegal pyroxenites and peridotites (??Hf(i) up to +97) is enhanced during melt-peridotite interaction by slow diffusional re-equilibration and can be relatively insensitive to chromatographic fractionation. Finally, we discuss the hypothesis that arc-continent interaction may provide preferential conditions for such isotopic decoupling and propose that its ubiquitous recognition in peridotites reflects the recycling of sub-arc mantle domains derived from ancient, reworked SCLM.
DS202008-1413
2020
Gregoire, M.Le Roex, A., Tinguely, C., Gregoire, M.Eclogite and garnet pyroxenite xenoliths from kimberlites emplaced along the southern margin of the Kaapvaal craton, southern Africa: mantle or lower crustal fragments?Journal of Petrology, https://doi.org/ 10.1093/petrology /egaa040 50p. PdfAfrica, South Africakimberlites

Abstract: Eclogite xenoliths, together with garnet pyroxenites and some mafic garnet granulites, found in kimberlites located along the southern margin of the Kaapvaal craton in southern Africa have been analysed by electron microprobe and mass spectrometry techniques to determine their geochemical characteristics. The majority of eclogites are bimineralic with garnet and omphacitic clinopyroxene in subequal proportions, with rutile as the main accessory phase; a few contain kyanite. Based on K2O in clinopyroxene and Na2O in garnet, the eclogites can be classified as Group II eclogites, and the majority are high-Ca in character. Garnet pyroxenites comprise garnet clinopyroxenites and garnet websterites. Major and trace element concentrations and isotope ratios of reconstituted bulk rock compositions of the eclogites and garnet pyroxenites allow constraints to be placed on depth of origin and likely protolith history. Calculated Fe–Mg exchange equilibration temperatures for the eclogites range from 815 to 1000?°C, at pressures of 1·7?±?0·4?GPa as determined by REE partitioning, indicating that they were sampled from depths of 50–55?km; i.e. within the lower crust of the Namaqua–Natal Belt. The garnet pyroxenites show slightly lower temperatures (686–835?°C) at similar pressures of equilibration. Initial 143Nd/144Nd and 87Sr/86Sr ratios (calculated to time of kimberlite emplacement) of both lithologies overlap the field for lower crustal samples from the Namaqua–Natal Belt. Further evidence for a crustal origin is found in the similar REE patterns shown by many of the associated garnet granulite xenoliths. Garnet pyroxenites are interpreted to have a similar origin as the associated eclogites but with the mafic protolith having insufficient Na (i.e. low modal plagioclase) to allow for development of omphacitic pyroxene. Metamorphism of the mafic protoliths to these eclogites and garnet pyroxenites is inferred to have occurred during crustal shortening and thickening associated with the collision of the Namaqua–Natal Belt with the Kaapvaal craton at 1–1·2?Ga.
DS202009-1639
2020
Gregoire, M.Le Roex, A., Tinguely, C., Gregoire, M.Eclogite and garnet pyroxenite xenoliths from kimberlites emplaced along the southern margin of the Kaapvaal Craton, southern Africa: mantle or lower crustal fragments?Journal of Petrology, pp. 1-32. pdf.Africa, South Africaeclogite, pyroxenite

Abstract: Eclogite xenoliths, together with garnet pyroxenites and some mafic garnet granulites, found in kimberlites located along the southern margin of the Kaapvaal craton in southern Africa have been analysed by electron microprobe and mass spectrometry techniques to determine their geochemical characteristics. The majority of eclogites are bimineralic with garnet and omphacitic clinopyroxene in subequal proportions, with rutile as the main accessory phase; a few contain kyanite. Based on K2O in clinopyroxene and Na2O in garnet, the eclogites can be classified as Group II eclogites, and the majority are high-Ca in character. Garnet pyroxenites comprise garnet clinopyroxenites and garnet websterites. Major and trace element concentrations and isotope ratios of reconstituted bulk rock compositions of the eclogites and garnet pyroxenites allow constraints to be placed on depth of origin and likely protolith history. Calculated Fe-Mg exchange equilibration temperatures for the eclogites range from 815 to 1000?°C, at pressures of 1•7?±?0•4?GPa as determined by REE partitioning, indicating that they were sampled from depths of 50-55?km; i.e. within the lower crust of the Namaqua-Natal Belt. The garnet pyroxenites show slightly lower temperatures (686-835?°C) at similar pressures of equilibration. Initial 143Nd/144Nd and 87Sr/86Sr ratios (calculated to time of kimberlite emplacement) of both lithologies overlap the field for lower crustal samples from the Namaqua-Natal Belt. Further evidence for a crustal origin is found in the similar REE patterns shown by many of the associated garnet granulite xenoliths. Garnet pyroxenites are interpreted to have a similar origin as the associated eclogites but with the mafic protolith having insufficient Na (i.e. low modal plagioclase) to allow for development of omphacitic pyroxene. Metamorphism of the mafic protoliths to these eclogites and garnet pyroxenites is inferred to have occurred during crustal shortening and thickening associated with the collision of the Namaqua-Natal Belt with the Kaapvaal craton at 1-1•2?Ga.
DS201112-0198
2010
Gregoirue, M.Coltori, M., Downes, H., Gregoirue, M., O'Reilly, S.Y.,editorsPetrological evolution of the European lithospheric mantle.Geological Society of London, Special Publ., 337, 246p.MantleBook - review
DS1992-0608
1992
Gregor, B.Gregor, B.Some ideas on the rock cycle: 1788-1988Geochimica et Cosmochimica Acta, Vol. 56, No. 8, pp. 2993-3000GlobalGeologic theory, Cyclic views
DS1997-0443
1997
Gregori, D.A.Gregori, D.A., Bjerg, E.A.New evidence on the nature of frontal Cordillera ophiolitic belt -ArgentinaJournal of South American Earth Sciences, Vol. 10, No. 2, pp. 147-156ArgentinaOphiolites
DS200712-0779
2007
GregorieNeumann, E.R., Simon, N.S.C., Bonadiman, C., Coltorti, Delpech, GregorieExtremely refractory oceanic lithospheric mantle and its implications for geochemical mass balance.Plates, Plumes, and Paradigms, 1p. abstract p. A712.MantleHarzburgite
DS200612-0835
2006
Gregorie, M.Lorand, J-P., Gregorie, M.Petrogenesis of base metal sulphide assemblages of some peridotites from the Kaapvaal Craton (South Africa).Contributions to Mineralogy and Petrology, Vol. 151, 5, May pp. 521-538.Africa, South AfricaKimberlites, whole rock geochemistry
DS200912-0013
2009
Gregorie, M.Arndt, N.T., Coltice, N., Helmstaedt, H., Gregorie, M.Origin of Archean subcontinental lithospheric mantle: some petrological constraints.Lithos, Vol. 109, 1-2, pp. 61-71.MantlePetrology
DS1997-0488
1997
GregoryHausel, 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
GregoryHausel, 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
DS201706-1115
2017
Gregory, C.J.Zi, J-W., Gregory, C.J., Rasmussen, B., Sheppard, S., Muhling, J.R.Using monazite geochronology to test the plume model for carbonatites: the example of Gifford Creek carbonatite complex, Australia.Chemical Geology, Vol. 463, pp. 50-60.Australiacarbonatite

Abstract: Carbonatites are carbonate-dominated igneous rocks derived by low-degree partial melting of metasomatized mantle, although the geodynamic processes responsible for their emplacement into the crust are disputed. Current models favor either reactivation of lithospheric structures in response to plate movements, or the impingement of mantle plumes. Geochronology provides a means of testing these models, but constraining the age of carbonatites and related metasomatic events is rarely straightforward. We use in situ U-Th-Pb analysis of monazite by SHRIMP to constrain the emplacement age and hydrothermal history of the rare earth element-bearing Gifford Creek Carbonatite Complex in Western Australia, which has been linked to plume magmatism at ca. 1075 Ma. Monazite in carbonatites and related metasomatic rocks (fenites) from the carbonatite complex dates the initial emplacement of the carbonatite at 1361 ± 10 Ma (n = 22, MSWD = 0.91). The complex was subjected to multiple stages of magmatic/hydrothermal overprinting from ca. 1300 Ma to 900 Ma during later regional tectonothermal events. Carbonatite emplacement at ca. 1360 Ma appears to be an isolated igneous event in the region, and occurred about 300 million years before intrusion of the ca. 1075 Ma Warakurna large igneous province, thus precluding a genetic connection. The Gifford Creek Carbonatite Complex occurs within a major crustal suture, and probably formed in response to reactivation of this suture during plate reorganization. Our study demonstrates the veracity of monazite geochronology in determining the magmatic and hydrothermal histories of a carbonatite complex, critical for evaluating competing geodynamic models for carbonatites. The approach involving in situ SHRIMP U-Th-Pb dating of monazite from a wide spectrum of rocks in a carbonatite complex is best suited to establishing the intrusive age and hydrothermal history of carbonatites.
DS201708-1587
2017
Gregory, C.J.Zi, J-W., Gregory, C.J., Rasmussen, B., Sheppard, S., Muhling, J.R.Using monazite geochronology to test the plume model for carbonatites: the example of Gifford Creek carbonatite complex, Australia.Chemical Geology, Vol. 463, pp. 50-60.Australiacarbonatites, Gifford Creek

Abstract: Carbonatites are carbonate-dominated igneous rocks derived by low-degree partial melting of metasomatized mantle, although the geodynamic processes responsible for their emplacement into the crust are disputed. Current models favor either reactivation of lithospheric structures in response to plate movements, or the impingement of mantle plumes. Geochronology provides a means of testing these models, but constraining the age of carbonatites and related metasomatic events is rarely straightforward. We use in situ U-Th-Pb analysis of monazite by SHRIMP to constrain the emplacement age and hydrothermal history of the rare earth element-bearing Gifford Creek Carbonatite Complex in Western Australia, which has been linked to plume magmatism at ca. 1075 Ma. Monazite in carbonatites and related metasomatic rocks (fenites) from the carbonatite complex dates the initial emplacement of the carbonatite at 1361 ± 10 Ma (n = 22, MSWD = 0.91). The complex was subjected to multiple stages of magmatic/hydrothermal overprinting from ca. 1300 Ma to 900 Ma during later regional tectonothermal events. Carbonatite emplacement at ca. 1360 Ma appears to be an isolated igneous event in the region, and occurred about 300 million years before intrusion of the ca. 1075 Ma Warakurna large igneous province, thus precluding a genetic connection. The Gifford Creek Carbonatite Complex occurs within a major crustal suture, and probably formed in response to reactivation of this suture during plate reorganization. Our study demonstrates the veracity of monazite geochronology in determining the magmatic and hydrothermal histories of a carbonatite complex, critical for evaluating competing geodynamic models for carbonatites. The approach involving in situ SHRIMP U-Th-Pb dating of monazite from a wide spectrum of rocks in a carbonatite complex is best suited to establishing the intrusive age and hydrothermal history of carbonatites.
DS1984-0311
1984
Gregory, E.Gregory, E.Constraints on Kimberlite Magma Ascent TimeUniversity WYOMING 1984 ROCKY MOUNTAIN GEO DAYS SYMPOSIUM, HELD A, PP. 5-7.United States, State Line, Colorado, WyomingGenesis
DS1988-0292
1988
Gregory, E.B.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
DS1960-1116
1969
Gregory, G.P.Gregory, G.P.Geochemical Dispersion Patterns Related to Kimberlite Intrusives in North America.Ph.d. Thesis, University of London, Royal School of Mines, 327P.United States, Gulf Coast, ArkansasGeochemistry
DS1960-1117
1969
Gregory, G.P.Gregory, G.P., Tooms, J.S.Geochemical Prospecting for KimberlitesCol. Sch. Mines Quarterly, Vol. 64, No. 1, JANUARY PP. 265-304.United States, Gulf Coast, ArkansasGeochemistry, Evaluation, Prairie Creek, Mineral Chemistry, Soil
DS1981-0193
1981
Gregory, G.P.Gregory, G.P., Seltrust mining corp. pty. ltd.Tr 7668h Alice Hill Diamond Exploration Dixon Range SheetWest Australia Geological Survey Open File., No. GSWA 1199 ROLL 403, M 2712, 27P.Australia, Western AustraliaProspecting, Photogeology, Stream Sediment Sampling
DS1982-0227
1982
Gregory, G.P.Gregory, G.P., Mason, M.G., Pedler, A.D., Williams, S.D.Argyle Diamond Deposit Western AustraliaConfidential Report In-house., JULY 6TH. 5P.Australia, Western AustraliaGeology, Petrology, Mineralogy
DS1982-0298
1982
Gregory, G.P.Jaques, A.L., Gregory, G.P., Lewis, J.D., Ferguson, J.The Ultrapotassic Rocks of the West Kimberley Region, Western Australia, and a New Class of Diamondiferous Kimberlite.Proceedings of Third International Kimberlite Conference, TERRA COGNITA, ABSTRACT VOLUME., Vol. 2, No. 3, PP. 251-252, (abstract.).AustraliaKimberlite, Leucite, Lamproite, Ellendale, Calwynyardah, Noonkanb
DS1984-0312
1984
Gregory, G.P.Gregory, G.P.Exploration for Primary Diamond Deposits with Special Emphasis on the Lennard Shelf, W.a. #2Bp Minerals Australia In House Report., UNPUBL. 16P.Australia, Western AustraliaProspecting
DS1984-0313
1984
Gregory, G.P.Gregory, G.P.Exploration for Primary Diamond Deposits with Special Emphasis on the Lennard Shelf, Western Australia. #1In: The Canning Basin., PP. 475-484.Australia, Western AustraliaProspecting, Sampling, Geochemistry, Geophysics, Remote Sensing
DS1984-0380
1984
Gregory, G.P.Jaques, A.L., Lewis, J.D., Smith, C.B., Gregory, G.P., Ferguson.The Diamond Bearing Ultrapotassic Lamproitic Rocks of the West Kimberley Region Western Australia.Proceedings of Third International Kimberlite Conference, Vol. 1, PP. 225-254.AustraliaLamproite, Geochronology, Ellendale, Calwynyardah, Noonkanbah
DS1989-0543
1989
Gregory, G.P.Gregory, G.P., White, D.R.Collection and treatment of diamond exploration samples #2Geological Society of Australia Inc. Blackwell Scientific Publishing, No. 14, Vol. 2, pp. 1123-1134AustraliaExploration, Geochemistry-sampling
DS1992-0609
1992
Gregory, G.P.Gregory, G.P., Janse, A.J.A.Diamond exploration in tropical terrainsin: Regolith exploration geochemistry in tropical and subtropical, Elsevier, ChapterV.1, pp. 419-437Australia, AfricaGeochemistry, Diamond exploration tropics
DS202009-1643
2020
Gregory, G-M.Nabyl, Z., Massuyeau, M.,Gaillard, F., Tuduri, J., Gregory, G-M., Trong, E., Di Carlo, I., Melleton, J., Bailly, L. A window in the course of alkaline magma differentiation conducive to immiscible REE-rich carbonatite.Geochimica et Cosmochimica Acta, Vol. 282, pp. 297-323.Africa, East Africacarbonatites

Abstract: Rare earth element (REE) enrichments in carbonatites are often described as resulting from late magmatic-hydrothermal or supergene processes. However, magmatic pre-enrichment linked to the igneous processes at the origin of carbonatites are likely to contribute to the REE fertilisation. Experimental constraints reveals that immiscibility processes between carbonate and silicate melts can lead to both REE enrichments and depletions in carbonatites making the magmatic processes controlling REE enrichments unclear. We link REE contents of carbonatites to the magmatic stage at which carbonatites are separated from silicate magma in their course of differentiation. We present results of experiments made at pressure and temperature conditions of alkaline magmas and associated carbonatites differentiation (0.2-1.5 GPa; 725-975?°C; FMQ to FMQ?+?2.5), simultaneously addressing crystal fractionation of alkaline magmas and immiscibility between carbonate (calcio-carbonate type) and silicate melts (nephelinite to phonolite type). The experimental data shows that the degree of differentiation, controlling the chemical composition of alkaline melts, is a key factor ruling the REE concentration of the coexisting immiscible carbonate melts. In order to predict carbonate melt REE enrichments during alkaline magma differentiation, we performed a parameterisation of experimental data on immiscible silicate and carbonate melts, based exclusively on the silica content, the alumina saturation index and the alkali/alkaline-earth elements ratio of silicate melts. This parameterisation is applied to more than 1600 geochemical data of silicate magmas from various alkaline provinces (East African Rift, Canary and Cape Verde Islands) and show that REE concentrations of their potential coeval carbonatite melts can reach concentration ranges similar to those of highly REE enriched carbonatites (?REE?>?30 000?ppm) by immiscibility with phonolitic/phono-trachytic melt compositions, while more primitive alkaline magmas can only be immiscible with carbonatites that are not significantly enriched in REE.
DS1910-0502
1916
Gregory, H.E.Gregory, H.E.Garnet Deposits of the Navajo Reservation, Arizona and UtahEconomic Geology, Vol. 11, PP. 223-230.United States, Arizona, Utah, Colorado PlateauPetrology
DS1910-0528
1917
Gregory, H.E.Gregory, H.E.Geology of the Navajo Country: a Reconnaissance of Parts Ofarizaona, New Mexico and Utah.United States Geological Survey (USGS) PROF. PAPER., No. 93, PP. 93-95; P. 102; PP. 146-147.United States, New Mexico, Utah, Colorado PlateauGeology
DS1860-0066
1868
Gregory, J.R.Gregory, J.R.Diamonds from the Cape of Good Hope Orange RiverGeology Magazine (London), Dec. 1, Vol. 5, No. 12, PP. 558-561.Africa, South Africa, Cape ProvinceHistory
DS1860-0085
1869
Gregory, J.R.Gregory, J.R.Discovery of Diamonds at the Cape Orange and Vaal riversGeology Magazine (London), Dec. 1, Vol. 6, PP. 333-334.Africa, South Africa, Cape ProvinceHistory
DS1996-0167
1996
Gregory, K.J.Branson, J., Brown, A.K., Gregory, K.J.Global continental changes: the context of paleohydrologyGeological Society of London, No. 115, 280p. approx. $98.00 United StatesGlobalPaleohydrology, Book -ad
DS1992-0236
1992
Gregory, K.M.Chase, C.G., Gregory, K.M., Butler, R.F.Geologic constraints on amounts of Colorado Plateau rotationEos Transactions, Vol. 73, No. 14, April 7, supplement abstracts p. 95Colorado PlateauPaleomagnetics, Tectonics
DS200612-0497
2006
Gregory, L.C.Gregory, L.C., Meert, J.G., Pradhan, V., Pandit, M.K., Tamrat, E., Malone, S.J.A paleomagnetic and geochronologic study of the Majhgawan kimberlite. India: implications for the age of the Upper Vindhyan Supergroup.Precambrian Research, Vol. 149, 1-2, pp. 65-75.IndiaDeposit - Majhgawan, geophysics, geochronology
DS201012-0596
2010
Gregory, L.C.Pradhan, V.R., Meert, J.G., Pandit, M.K., Kamenov, G., Gregory, L.C., Malone, S.J.India's changing place in global Proterozoic reconstructions: a review of geochronologic constraints and paleomagnetic poles from the Dharwar Bundelk hand and MarwarJournal of Geodynamics, Vol. 50, 3-4, pp. 224-242.IndiaCraton, crustal evolution
DS201412-0248
2015
Gregory, L.C.Foster, D.A., Goscombe, B.D., Newstead, B., Mapani, B., Mueller, P.A., Gregory, L.C., Muvangua, E.U-Pb age and Lu-Hf isotopic dat a of detrital zircons from the Neoproterozoic Damara sequence: implications for Congo and Kalahari before Gondwana.Gondwana Research, Vol. 28, 1, pp. 179-190.AfricaGeochronology
DS1986-0303
1986
Gregory, P.G.Gregory, P.G., White, D.R.Collection and treatment of diamond exploration samples, #1Proceedings of the Fourth International Kimberlite Conference, Held, No. 16, pp. 460-462AustraliaDiamond exploration
DS1992-0684
1992
Gregory, R.H.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
DS1984-0314
1984
Gregory, R.T.Gregory, R.T., Taylor, H.P.Jr.Non Equilibrium 18 O 16 O Effects in Mantle XenolithsGeological Society of America (GSA), Vol. 16, No. 6, P. 524. (abstract.).GlobalGeothermometry
DS1986-0304
1986
Gregory, R.T.Gregory, R.T., Taylor, H.P.Jr.Possible non-equilibrium oxygen isotope effects in mantlenodules, an alternative to the Kyser O'Neil Carmichael 18O16geothermometerContributions to Mineralogy and Petrology, Vol. 93, No. 1, pp. 114-119GlobalGeothermometry
DS1986-0305
1986
Gregory, R.T.Gregory, R.T., Taylor, H.P.Jr.Non-equilibrium metasomatic 18 O/16 effects in upper mantlemineralassemblagesContributions to Mineralogy and Petrology, Vol. 93, No. 1, pp. 124-135GlobalMantle
DS1987-0728
1987
Gregory, R.T.Taylor, H.P..Jr., Gregory, R.T., Turi, B.Oxygen-18/Oxygen-16 evidence for fluid rock interaction in the uppermantle: dat a from ultramafic nodules and potassium rich volcanic rocks inItalyNato, Ser. C., Chemical Transp. Metasomatic processes, Vol. 218, pp. 1-37ItalyPeridotite nodule basalt, kimberlite, Inclusions
DS1999-0300
1999
Gregory, R.W.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
DS2001-0459
2001
Gregory, R.W.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
DS201906-1270
2019
Gregory, S.P.Barnett, M.J., Deady, E.A., Gregory, S.P., Palumbo-Roe, B.The role of biobased circular economy approach in sustainable critical metal extraction: the rare earth elements. Bioleaching3rd International Critical Metals Meeting held Edinburgh, Apr. 30-May 2.GlobalREE

Abstract: PDF link to presentation.
DS1960-0246
1962
Gregory, Sir.T.Gregory, Sir.T.Ernest Oppenheimer and the Economic Development of Southernafrica. #1London: Oxford University Press, Southwest Africa, Namibia, South AfricaDiamond, Politics, Biography, Kimberley
DS1960-0247
1962
Gregory, T.E.Gregory, T.E.Ernest Oppenheimer and the Economic Development of Southernafrica. #2Cape Town: Oxford University Press, 637P.South AfricaHistory, Kimberley
DS201912-2821
2019
Gregoryanz, E.Sanatmaria-Perez, D., Ruiz-Fuertes, J., Pena-Alvarez, M., Chulia-Jordan, R., Marquerno, T., Zimmer, D., Guterrez-Cano, V., Macleod, S., Gregoryanz, E., Popescue, C., Rodriguez-Herandez, P., Munoz, A.Post-tilleyite, a dense calcium silicate carbonate phase.Nature Scientific Reports, Vol. 9, 11p. PdfMantletilleyite

Abstract: Calcium carbonate is a relevant constituent of the Earth’s crust that is transferred into the deep Earth through the subduction process. Its chemical interaction with calcium-rich silicates at high temperatures give rise to the formation of mixed silicate-carbonate minerals, but the structural behavior of these phases under compression is not known. Here we report the existence of a dense polymorph of Ca5(Si2O7)(CO3)2 tilleyite above 8 GPa. We have structurally characterized the two phases at high pressures and temperatures, determined their equations of state and analyzed the evolution of the polyhedral units under compression. This has been possible thanks to the agreement between our powder and single-crystal XRD experiments, Raman spectroscopy measurements and ab-initio simulations. The presence of multiple cation sites, with variable volume and coordination number (6-9) and different polyhedral compressibilities, together with the observation of significant amounts of alumina in compositions of some natural tilleyite assemblages, suggests that post-tilleyite structure has the potential to accommodate cations with different sizes and valencies.
DS2002-0034
2002
Gregory-Wodzicki, K.M.Anders, M.H., Gregory-Wodzicki, K.M., Spiegelman, M.A critical evaluation of Late Tertiary accelerated uplift rates for the eastern Cordillera, central AndesJournal of Geology, Vol.110,1,pp. 89-100.BoliviaTectonics
DS1991-0605
1991
Gregotski, M.E.Gregotski, M.E., Jensen, O., Arkani-Hamed, J.Fractal stochastic modeling of aeromagnetic dataGeophysics, Vol. 56, No. 11, November pp. 1706-1715Alberta, OntarioGeophysics, Athabaska Basin, Kirkland Lake
DS201705-0834
2017
Greiff, S.Hilgner, A., Greiff, S., Quast, D.Gemstones in the first millennium AD. Mines, trade, workshops and symbolism. Romisch-Germanisches Zentralmuseum Leibniz-Forschungsinstitut fur Archaologie Mainz International Conference Oct. 20-22, 2015, pp. 155-217.GlobalBook - gemstones
DS1989-0544
1989
Greig, A.Greig, A., Nicholls, I.A.Thermal histories of Victorian peridotite xenolithsNew Mexico Bureau of Mines Bulletin., Continental Magmatism Abstract Volume, Held, Bulletin. No. 131, p. 114 Abstract held June 25-July 1AustraliaAnakie cone, Xenoliths
DS1992-0610
1992
Greig, A.Greig, A., Nicholls, I., Sie, S.Metasomatism of the upper mantle by melts: a proton microprobe study11th. Australian Geol. Convention Held Ballarat University College, Jan., AbstractAustraliaMantle, Microprobe
DS1996-0911
1996
Greig, A.McBride, J.S., Lambert, D.D., Greig, A., Nicholls, I.A.Multistage evolution of Australian subcontinental mantle: Rhenium- Osmium (Re-Os) isotopic constraints from Victorian...Geology, Vol. 24, No. 7, July pp. 631-634.Australia, VictoriaMantle xenoliths, Geochronology
DS2003-0682
2003
Greig, A.Kamber, B.S., Greig, A., Schoenberg, R., Collerson, K.D.A refined solution to Earth's hidden niobium: implications for evolution of continentalPrecambrian Research, Vol. 126, 3-4, Oct. pp.289-308.MantleGeochemistry - niobium
DS200412-0943
2003
Greig, A.Kamber, B.S., Greig, A., Schoenberg, R., Collerson, K.D.A refined solution to Earth's hidden niobium: implications for evolution of continental crust and mode of core formation.Precambrian Research, Vol. 126, 3-4, Oct. pp.289-308.MantleGeochemistry - niobium
DS201112-1119
2011
Greig, A.Woodhead, J., Hergt, J., Greig, A., Edwards, L.Subduction zone Hf anomalies: mantle messenger, melting artefact or crustal process?Earth and Planetary Science Letters, Vol. 304, 1-2, pp. 231-239.MantleSubduction
DS201312-0314
2013
Greig, A.Giuliani, A., Phillips, D., Kendrick, M.K., Maas, R., Greig, A., Armstrong, R., Felgate, M.R., Kamenetsky, V.S.Dating mantle metasomatism: a new tool ( U/PB LIMA Titanate) and an imposter ( 40Ar/39Ar phlogopite).Goldschmidt 2013, AbstractMantleMetasomatism
DS201412-0296
2014
Greig, A.Giuliani, G., Phillips, D., Maas, R., Woodhead, J.D., Kendrick, M.A., Greig, A., Armstrong, R.A., Chew, D., Kamenetsky, V.S., Fiorentini, M.I.LIMA U-Pb ages link lithospheric mantle metasomatism to Karoo magmatism beneath the Kimberley region, South Africa.Earth and Planetary Science Letters, Vol. 401, pp. 132-147.Africa, South AfricaKimberlite
DS201803-0450
2014
Greig, A.Giuliani, A., Phillips, D., Maas, R., Woodhead, J.D., Kendrick, M.A., Greig, A., Armstrong, R.A., Chew, D., Kamenetsky, V.S., Fiorentini, M.L.LIMA U-Pb ages link lithospheric mantle metasomatism to Karoo magmatism beneath the Kimberley region, South Africa.Earth and Planetary Science Letters, Vol. 401, pp. 132-147.Africa, South Africametasomatism

Abstract: The Karoo igneous rocks (174-185 Ma) of southern Africa represent one of the largest continental flood basalt provinces on Earth. Available evidence indicates that Karoo magmas either originated in the asthenosphere and were extensively modified by interaction with the lithospheric mantle prior to emplacement in the upper crust; or were produced by partial melting of enriched mantle lithosphere. However, no direct evidence of interaction by Karoo melts (or their precursors) with lithospheric mantle rocks has yet been identified in the suites of mantle xenoliths sampled by post-Karoo kimberlites in southern Africa. Here we report U-Pb ages for lindsleyite-mathiasite (LIMA) titanate minerals (crichtonite series) from three metasomatised, phlogopite and clinopyroxene-rich peridotite xenoliths from the ~84 Ma Bultfontein kimberlite (Kimberley, South Africa), located in the southern part of the Karoo magmatic province. The LIMA minerals appear to have formed during metasomatism of the lithospheric mantle by fluids enriched in HFSE (Ti, Zr, Hf, Nb), LILE (K, Ba, Ca, Sr) and LREE. LIMA U-Pb elemental and isotopic compositions were measured in situ by LA-ICP-MS methods, and potential matrix effects were evaluated by solution-mode analysis of mineral separates. LIMA minerals from the three samples yielded apparent U-Pb ages of , and (). A single zircon grain extracted from the ~190 Ma LIMA-bearing sample produced a similar U-Pb age of , within uncertainty of the LIMA ages. These data provide the first robust evidence of fluid enrichment in the lithospheric mantle beneath the Kimberley region at ~180-190 Ma, and suggest causation of mantle metasomatism by Karoo melts or their precursor(s). The results further indicate that U-Pb dating of LIMA minerals provides a new, accurate tool for dating metasomatic events in the lithospheric mantle.
DS201908-1773
2019
Greig, A.Bussweiler, Y., Giuliani, A., Greig, A., Kjarsgaard, B.A., Petts, D., Jackson, S.E., Barrett, N., Luo, Y., Pearson, D.G.Trace element analysis of high-Mg olivine by LA-ICP-MS - characterization of natural olivine standards for matrix-matched calibration and application to mantle peridotites.Chemical Geology, Vol. 524, pp. 136-157.Mantleperidotite

Abstract: The trace element composition of olivine is becoming increasingly important in petrological studies due to the ubiquity of olivine in the Earth's upper mantle and in primitive magmatic rocks. The LA-ICP-MS method allows for the routine analysis of trace elements in olivine to sub-ppm levels, but a major drawback of this method is the lack of knowledge about possible downhole fractionation effects when non matrix-matched calibration is used. In this contribution, we show that matrix-matched (i.e., olivine-based) calibration is preferable for small laser spot sizes (<100?µm) due to significant laser-induced inter-element fractionation between olivine and commonly used silicate glass calibration materials, e.g., NIST SRM 612, GSD-1G and BHVO-2G. As a result, we present two Mg-rich natural olivine standards (355OL and SC-GB) that have been characterized by independent methods (EPMA, solution ICP-MS), and by LA-ICP-MS in four different laboratories. These natural olivines have been used 1) as primary standards for the matrix-matched calibration of olivine samples for most elements of interest (e.g., Li, Na, Al, P, Ca, Sc, Ti, V, Cr, Mn, Co, Ni, Cu, Zn), and 2) as secondary standards to assess the accuracy of results. Comparison of olivine- and silicate glass-calibrated results for natural peridotitic olivine reveals that matrix-matched calibration is essential when using small laser spot sizes (<100?µm) in order to mitigate downhole fractionation effects for certain elements, especially Na, P, Mn, Co, Ni and Zn. If matrix-matched calibration is not feasible, we recommend that spot sizes of =100?µm, laser fluence of =4.0?J/cm2, and total laser shot counts of =250 (e.g., 5?Hz repetition rate for 50?s) are used in order to minimize fractionation effects between olivine and silicate glass calibration materials. We demonstrate the applicability of matrix-matched calibration on olivine from a suite of different mantle peridotite xenoliths sampled by kimberlites and alkali basalts from on-craton and off-craton localities.
DS1993-1128
1993
Greig, A.G.Nicholls, I.A., Greig, A.G., Gray, C.M., Price, R.C.Newer volcanics province- basalts, xenoliths and megacrystsAustralia Geological Survey AGSO, Record No. 1993/58, $ 16.95AustraliaNewer Volcanics, Xenoliths
DS201704-0627
2017
Greig, J.Greig, J., Besserer, D., Raffle, K.Exploring forgotten diamond-bearing ground in the North Slave Craton. Muskox and JerichoVancouver Kimberlite Cluster, Apr. 5, 1p. AbstractCanada, NunavutDeposit - Jericho
DS1996-0659
1996
Greiling, R.Hynes, A., Arkani-Hamed, J., Greiling, R.Subduction of continental margins and the uplift of high pressure metamorphic rocksEarth and Planetary Science Letters, Vol. 140, No. 1-4, May 1, pp. 13-26GlobalTectonics, Subduction -metamorphism
DS1998-0472
1998
Greiling, R.O.Garfunkel, Z., Greiling, R.O.A thin orogenic wedge upon thick foreland lithosphere and the missing foreland basin.Geol. Rundsch., Vol. 87, pp. 314-25.Scandinavia, Norway, Sweden, FinlandTectonics, Collisional orogen
DS201810-2336
2018
Greiling, R.O.Kankeu, B., Greiling, R.O., Nzenti, J.P., Ganno, S., Danguene, P.Y.E., Basshahak, J., Hell, J.V.Contrasting Pan-African structural styles at the NW margin of the Congo shield in Cameroon.Journal of African Earth Sciences, Vol. 146, pp. 28-47.Africa, Camerooncraton

Abstract: Field, microstructural, and anisotropy of magnetic susceptibility (AMS, magnetic fabrics) studies assessed the Pan-African deformational history and strain geometry at the southern margin of the Central African Fold Belt (CAFB) against the older, cratonic basement of the Congo Shield (CS). Reflected light microscopy and thermomagnetic studies supported the identification of magnetic minerals. Data cover a low angle thrust margin (Mbengis-Sangmelima area) in the east and high angle shear zones cutting the margin (Kribi area) in the west, at the Atlantic coast. In the CS basement units, magnetic anisotropy is generally higher than in the low grade Pan-African units. In the latter, early D1/D2 shortening produced a flat-lying magnetic foliation parallel with the regional trend of the belt, a shallow magnetic lineation, and mostly oblate fabrics. Subsequent D3 deformation is only of local importance in the Mbengis-Sangmelima area. The magnetic lineation shows distinct maxima in NNE-SSW direction, parallel with the low angle tectonic transport direction. In the Kribi area, the NNE-SSW trending Kribi-Campo shear zone (KCSZ) affected both older rocks and Pan-African high grade metapelites of the Yaoundé unit together with their basal thrust. The early planar fabric (S1) was overprinted during D2 folding under relatively high T conditions, and subsequent D3 wrenching. Magnetic fabrics document a progressive change from oblate towards prolate ellipsoids towards the KCSZ. Magnetic foliations with medium to steep dips curve into the N-S to NE-SW orientation of the KCSZ, lineations follow the same trend with shallow to medium plunges. This fabric implies that the KCSZ is a Pan-African strike-slip shear zone with a subordinate component of compression. Strike-slip tectonics in the west (KCSZ) and thrusting in the east imply N-S to NE-SW convergence during Pan-African terrane assembly against the present northern margin of the CS. In addition, the KCSZ may separate the CS from the São Francisco Craton in Brazil and thus be the northern part of a link connecting the CAFB to the West Congo Belt in the south. This putative Pan-African link separated the São Francisco Craton from the Congo Shield prior to Mesozoic Gondwana break-up.
DS1999-0264
1999
Greiner, B.Greiner, B.Euler rotations in plate tectonic reconstructionsComputers and Geosciences, Vol. 25, No. 3, pp. 209-216.GlobalTectonics, Euler application - not specific to diamonds
DS1988-0268
1988
Greiner, N.R.Greiner, N.R., Phillips, D.S., Johnson, J.D., Volk, F.Diamonds in detonation sootNature, Vol. 333, No. 6172, June 2, pp. 440-441GlobalBlank
DS1990-0150
1990
Greiner, R.Badziag, P., Verwoerd, W.S., Ellis, W.P., Greiner, R.Nanometre-sized diamonds are more stable than graphiteNature, Vol. 343, No. 6255, Jan. 18, pp. 244-245GlobalDiamond crystallography
DS2002-0096
2002
Greiner Mai, H.Ballani, L., Greiner Mai, H., Stromeyer, D.Determining the magnetic field in the core mantle boundary zone by non-harmonic downward continuation.Geophysical Journal International, Vol.149,2,pp.374-89., Vol.149,2,pp.374-89.MantleGeophysics - magnetics, Boundary
DS2002-0097
2002
Greiner Mai, H.Ballani, L., Greiner Mai, H., Stromeyer, D.Determining the magnetic field in the core mantle boundary zone by non-harmonic downward continuation.Geophysical Journal International, Vol.149,2,pp.374-89., Vol.149,2,pp.374-89.MantleGeophysics - magnetics, Boundary
DS201902-0261
2019
Grenholm, M.Baratoux, L., Soderlund, U., Ernst, R.E., de Roever, E., Jessell, M.W., Kamo, S., Naba, S., Perrouty, S., Metelka, V., Yatte, D., Grenholm, M., Diallo, D.P., Ndiaye, P.M., Dioh, E., Cournede, C., Benoit, M., Baratoux, D., Youbi, N., Rousse, S., BendaoudNew U-Pb baddeleyite ages of mafic dyke swarms of the West African and Amazonian cratons: implication for their configuration in supercontinents through time.Dyke Swarms of the World: a modern perspective, Srivastava et al. eds. Springer , pp. 263-314.Africa, West Africa, South Americageochronology

Abstract: Eight different generations of dolerite dykes crosscutting the Paleoproterozoic basement in West Africa and one in South America were dated using the high precision U-Pb TIMS method on baddeleyite. Some of the individual dykes reach over 300 km in length and they are considered parts of much larger systems of mafic dyke swarms representing the plumbing systems for large igneous provinces (LIPs). The new U-Pb ages obtained for the investigated swarms in the southern West African Craton (WAC) are the following (oldest to youngest): 1791?±?3 Ma for the N010° Libiri swarm, 1764?±?4 Ma for the N035° Kédougou swarm, 1575?±?5 for the N100° Korsimoro swarm, ~1525-1529 Ma for the N130° Essakane swarm, 1521?±?3 Ma for the N90° Sambarabougou swarm, 915?±?7 Ma for the N070° Oda swarm, 867?±?16 Ma for the N355° Manso swarm, 202?±?5 Ma and 198?±?16 Ma for the N040° Hounde swarm, and 200?±?3 Ma for the sills in the Taoudeni basin. The last ones are related to the Central Atlantic Magmatic Province (CAMP) event. The Hounde swarm is oblique to the dominant radiating CAMP swarm and may be linked with the similar-trending elongate Kakoulima intrusion in Guinea. In addition, the N150° Käyser swarm (Amazonian craton, South America) is dated at 1528?±?2 Ma, providing a robust match with the Essakane swarm in a standard Amazonia-West African craton reconstruction, and resulting in a combined linear swarm >1500 km by >1500 km in extent. The Precambrian LIP barcode ages of c. 1790, 1765-1750, 1575, 1520, 915. 870 Ma for the WAC are compared with the global LIP record to identify possible matches on other crustal blocks, with reconstruction implications. These results contribute to the refinement of the magmatic ‘barcode’ for the West African and Amazonian cratons, representing the first steps towards plausible global paleogeographic reconstructions involving the West African and Amazonian cratons.
DS1989-0545
1989
Grenne, T.Grenne, T.Magmatic evolution of the Lokken SSZ ophiolite,Norwegian Caledonides:relationships between anomalous lavas and high-level intrusionsGeol. Journal, Vol. 24, pp. 251-274NorwayOphiolite, Geochemistry
DS1996-1435
1996
Grenne, T.Tontti, M., Gautneb, H., Grenne, T., et al.Map of ore deposits in central FennoscandiaFinland Geological Survey Map, 1: 1, 000, 000FinlandMetallogeny, Deposits
DS200812-0483
2008
Grenon, H.Holmes, P.K., Grenon, H., Self, M.V., Pell, J., Neilson, S.The Chidliak property, a new diamond district on Baffin Island, Nunavut.Northwest Territories Geoscience Office, p. 35. abstractCanada, Nunavut, Baffin IslandBrief overview - Peregrine
DS200912-0310
2009
Grenon, H.Holmes, P., Pell, J., Clements, B., Grenon, H., Sell, M.The Chidliak diamond project, Baffin Island, one year after initial discovery.37th. Annual Yellowknife Geoscience Forum, Abstracts p. 24.Canada, Nunavut, Baffin IslandHistory
DS201212-0295
2012
Grenon, H.Herman, L.M., Grutter, H.S., Pell, J., Holmes, P., Grenon, H.U-Pb geochronology , SR and ND isotope compositions of groundmass perovskite from the Chidliak and Qilaq kimberlites, Baffin Island, Nunavut.10th. International Kimberlite Conference Held Bangalore India Feb. 6-11, Poster abstractCanada, Nunavut, Baffin IslandDeposit - Chidliak, Qilaq
DS201212-0515
2012
Grenon, H.Neilson, S., Grutter, H., Pell, J., Grenon, H.The evolution of kimberlite indicator mineral interpretation on the Chidliak project, Baffin Island, Nunavut.10th. International Kimberlite Conference Held Bangalore India Feb. 6-11, Poster abstractCanada, Nunavut, Baffin IslandDeposit - Chidliak
DS201212-0548
2012
Grenon, H.Pell, J., Grutter, H., Grenon, H., Dempsey, S., Neilson, S.Exploration and discovery of the Chidliak kimberlite province, Baffin Island, Nunavut: Canada's newest diamond district.10th. International Kimberlite Conference Feb. 6-11, Bangalore India, AbstractCanada, Nunavut, Baffin IslandDeposit - Chidliak
DS201312-0695
2013
Grenon, H.Pell, J., Clements, B., Grutter, H., Neilson, S., Grenon, H.Following kimberlite indicator minerals to source in the Chidliak kimberlite province, Nunavut.PDAC 2013 , 6p.Canada, Nunavut, Baffin IslandIndicator Mineralogy
DS201312-0696
2013
Grenon, H.Pell, J., Clements, B., Grutter, H., Neilson, S., Grenon, H.Following kimberlite indicator minerals to source in the Chidliak kimberlite province, Nunavut.GSC Open file 7374 Ftp2.cits.rncan.gc.ca, pp. 47-52.Canada, Nunavut, Baffin IslandDeposit - Chidliak
DS201412-0670
2013
Grenon, H.Pell, J., Grutter, H., Neilson, S., Lockhart, G., Dempsey, S., Grenon, H.Exploration and discovery of the Chidliak kimberlite province, Baffin Island, Nunavut: Canada's newest diamond district.Proceedings of the 10th. International Kimberlite Conference, Vol. 2, pp. 209-228.Canada, Nunavut, Baffin IslandDeposit - Chidliak area
DS200512-0671
2005
Grenvold, K.MacPherson, C.G., Hilton, D.R., Day, J.M., Lowry, D., Grenvold, K.High 3He 4He depleted mantle and low 180 recycled oceanic lithosphere in the source of central Iceland magmatism.Physics and Planetary Science Letters, Vol. 233, 3-4, pp. 411-427.MantleGeochemistry
DS1998-0090
1998
Gresham, D.A.Bauer, R.L., Gresham, D.A., Edson, J.D.Early Proterozoic ductile reworking of Archean basement in the Central Laramie Range: a complex response...Basement Tectonics, Vol. 12, pp. 219-222.WyomingCheyenne Belt, Trans Hudson Orogen, Central Plains
DS202008-1438
2019
Greshnyakov, E.D.Rezvukhina, O.V., Korsakov, A.V., Rezvukin, D.I., Zamyatin, D.A., Zelenovskiy, P.S., Greshnyakov, E.D., Shur, V.Y.A combined Raman spectroscopy, cathodoluminescence, and electron backscatter diffraction study of kyanite porphyroblasts from diamondiferous and diamond-free metamorphic rocks ( Kokchetav Massif).Journal of Raman Spectroscopy, 13p. PdfRussialuminescence

Abstract: A series of precise nondestructive analytical methods (Raman spectroscopy, cathodoluminescence, and EBSD—electron backscatter diffraction) has been employed to investigate the internal textures of kyanite porphyroblasts from diamondiferous and diamond-free ultrahigh-pressure metamorphic rocks (Kokchetav massif, Northern Kazakhstan). Such internal kyanite characteristics as twinning, radial fibrous pattern, and spotty zoning were identified by means of Raman and cathodoluminescence imaging, whereas an intergrowth of two kyanite crystals was distinguished only by Raman imaging. The EBSD analysis recorded an ~10-25° changing of orientations along the elongation in the investigated kyanite porphyroblasts. The absence of a radial fibrous pattern and a spotty zoning on the EBSD maps indicates that these textures are not related to variations in crystallographic orientation. The absence of clear zoning patterns (cores, mantles, and rims) on the Raman, cathodoluminescence, or EBSD maps of the kyanite porphyroblasts indicates the rapid single-stage formation of these porphyroblasts near the peak metamorphic conditions and the lack of recrystallization processes. The obtained results provide important implications for deciphering of mineral internal textures, showing that the data obtained by cathodoluminescence mapping can be clearly reproduced by Raman imaging, with the latter method occasionally being even more informative. This observation is of significant importance for the study of minerals that are unexposed on a thin section surface or Fe- and Ni-rich minerals that do not show luminescence emission. The combination of the Raman spectroscopic, cathodoluminescence, and EBSD techniques may provide better spatial resolution for distinguishing different domains and textural peculiarities of mineral than the selective application of individual approaches.
DS202101-0031
2020
Greshnyakov, E.D.Rezvukhina, O.V., Korsakov, A.V., Rezvukin, D.I., Mikhailenko, D.S., Zamyatin, D.A., Greshnyakov, E.D., Shur, V.Y.Zircon from diamondiferous kyanite gneisses of the Kokchetav massif: revealing growth stages using an integrated cathodluminescence- Raman spectroscopy- electron microprobe approach.Mineralogical Magazine, in press 28p. https://doi.org /10.1180/mgm.2020.95RussiaKokchetav
DS201705-0885
2017
Gress, M.van den Heuvel, Q., Matveev, S., Drury, M., Gress, M., Chinn, I., Davies, G.Genesis of diamond inclusions: an integrated cathodluminescence ( CL) and electron backscatter diffraction (EBSD) study on eclogitic and peridotitic inclusions and their diamond host.European Geosciences Union General Assembly 2017, Vienna April 23-28, 1p. 6564 AbstractAfrica, BotswanaDeposit - Jwaneng, Letlhakane
DS201708-1654
2017
Gress, M.Gress, M.Three phases of diamond growth spanning > 2.0 Ga beneath Letlhakane established by Re-Os and Sm-Nd systematics of individual eclogitic sulphide, garnet and clinopyroxene inclusions.11th. International Kimberlite Conference, OralAfrica, Botswanadeposit - Letlhakane

Abstract: The diamondiferous Letlhakane kimberlites are part of the Orapa kimberlite cluster (˜ 93.1 Ma) in north-eastern Botswana, located on the edge of the Zimbabwe Craton, close to the Proterozoic Magondi Mobile Belt. Here we report the first Re-Os ages of six individual eclogitic sulphide inclusions (3.0 to 35.7µg) from Letlhakane diamonds along with their rhenium, osmium, iridium and platinum concentrations, and carbon isotope, nitrogen content and N-aggregation data from the corresponding growth zones of the host diamonds. For the first time, Re-Os data will be compared to Sm-Nd ages of individual eclogitic silicate inclusions recovered from the same diamonds using a Triton Plus equipped with four 1013O amplifiers. The analysed inclusion set currently encompasses pairs of individual sulphides from two diamonds (LK040 sf4 & 5, LK113 sf1 & 2) and two sulphide inclusions from separate diamonds (LK048, LK362). Ongoing work will determine the Sm-Nd ages and element composition of multiple individual eclogitic garnets (LK113/LK362, n=4) and an eclogitic clinopyroxene (LK040) inclusion. TMA ages of the six sulphides range from 1.06 to 2.38 Ga (± 0.1 to 0.54 Ga) with Re and Os contents between 7 and 68 ppb and 0.03 and 0.3 ppb, respectively. The host diamond growth zones have low nitrogen abundances (21 to 43 ppm N) and high N-aggregation (53 to 90% IaB). Carbon isotope data suggests the involvement of crustal carbon (d13C between -19.3 to -22.7 ± 0.2 per mill) during diamond precipitation. Cathodoluminescence imaging of central plates from LK040 and LK113 displays homogenous internal structure with no distinct zonation. The two sulphide inclusions from LK040 define an 'isochron' of 0.92 ± 0.23 Ga (2SD) with initial 187Os/188Os = 1.31 ± 0.24. Sulphides from LK113 have clear imposed diamond morphology and indicate diamond formation at 0.93 ± 0.36 Ga (2SD) with initial 187Os/188Os = 0.69 ± 0.44. The variation in the initial 187Os/188Os does not justify including these inclusions (or any from other diamonds) on the same isochron and implies an extremely heterogeneous diamond crystallisation environment that incorporated recycled Os. C1-normalized osmium, iridium and platinum (PGE) compositions from the analysed sulphide inclusions display enrichment in Ir (3.4 to 33) and Pt (2.3 to 28.1) in comparison to eclogitic xenolith data from Orapa that are depleted relative to chondrite. The Re-Os isochrons determined in this study are within error of previously reported ages from the adjacent (˜40km) Orapa diamond mine (1.0 to 2.9 Ga) based on sulphide inclusions and a multi-point 990 ± 50 Ma (2SD) isochron for composite (n=730) silicate inclusions. Together with additional new Sm-Nd isochron age determinations from individual silicate inclusions from Letlhakane (2.3 ± 0.02 (n = 3); 1.0 ± 0.14 (n = 4) and 0.25 ± 0.04 Ga (n = 3), all 2SE) these data suggest a phase of Mesoproterozoic diamond formation as well as Neoarchean/Paleoproterozoic and Mesozoic diamond growth, in punctuated events spanning >2.0 Ga.
DS201708-1655
2017
Gress, M.Gress, M.Variation in diamond growth events recorded in Botswanan diamonds.11th. International Kimberlite Conference, PosterAfrica, Botswanadiamond morphology
DS201705-0833
2017
Gress, M.U.Gress, M.U., Pearson, D.G., Timmerman, S., Chinn, I.L., Koornneef, J., Davies, G.R.Diamond growth beneath Letlhakane established by Re-Os and Sm-Nd systematics of individual eclogitic sulphide, garnet and clinopyroxene inclusions.European Geosciences Union General Assembly 2017, Vienna April 23-28, 1p. 5540 AbstractAfrica, BotswanaDeposit - Letlhakane

Abstract: The diamondiferous Letlhakane kimberlites are part of the Orapa kimberlite cluster (˜ 93.1 Ma) in north-eastern Botswana, located on the edge of the Zimbabwe Craton, close to the Proterozoic Magondi Mobile Belt. Here we report the first Re-Os ages of six individual eclogitic sulphide inclusions (3.0 to 35.7µg) from Letlhakane diamonds along with their rhenium, osmium, iridium and platinum concentrations, and carbon isotope, nitrogen content and N-aggregation data from the corresponding growth zones of the host diamonds. For the first time, Re-Os data will be compared to Sm-Nd ages of individual eclogitic silicate inclusions recovered from the same diamonds using a Triton Plus equipped with four 1013O amplifiers. The analysed inclusion set currently encompasses pairs of individual sulphides from two diamonds (LK040 sf4 & 5, LK113 sf1 & 2) and two sulphide inclusions from separate diamonds (LK048, LK362). Ongoing work will determine the Sm-Nd ages and element composition of multiple individual eclogitic garnets (LK113/LK362, n=4) and an eclogitic clinopyroxene (LK040) inclusion. TMA ages of the six sulphides range from 1.06 to 2.38 Ga (± 0.1 to 0.54 Ga) with Re and Os contents between 7 and 68 ppb and 0.03 and 0.3 ppb, respectively. The host diamond growth zones have low nitrogen abundances (21 to 43 ppm N) and high N-aggregation (53 to 90% IaB). Carbon isotope data suggests the involvement of crustal carbon (d13C between -19.3 to -22.7 ± 0.2 per mill) during diamond precipitation. Cathodoluminescence imaging of central plates from LK040 and LK113 displays homogenous internal structure with no distinct zonation. The two sulphide inclusions from LK040 define an 'isochron' of 0.92 ± 0.23 Ga (2SD) with initial 187Os/188Os = 1.31 ± 0.24. Sulphides from LK113 have clear imposed diamond morphology and indicate diamond formation at 0.93 ± 0.36 Ga (2SD) with initial 187Os/188Os = 0.69 ± 0.44. The variation in the initial 187Os/188Os does not justify including these inclusions (or any from other diamonds) on the same isochron and implies an extremely heterogeneous diamond crystallisation environment that incorporated recycled Os. C1-normalized osmium, iridium and platinum (PGE) compositions from the analysed sulphide inclusions display enrichment in Ir (3.4 to 33) and Pt (2.3 to 28.1) in comparison to eclogitic xenolith data from Orapa that are depleted relative to chondrite. The Re-Os isochrons determined in this study are within error of previously reported ages from the adjacent (˜40km) Orapa diamond mine (1.0 to 2.9 Ga) based on sulphide inclusions and a multi-point 990 ± 50 Ma (2SD) isochron for composite (n=730) silicate inclusions. Together with additional new Sm-Nd isochron age determinations from individual silicate inclusions from Letlhakane (2.3 ± 0.02 (n = 3); 1.0 ± 0.14 (n = 4) and 0.25 ± 0.04 Ga (n = 3), all 2SE) these data suggest a phase of Mesoproterozoic diamond formation as well as Neoarchean/Paleoproterozoic and Mesozoic diamond growth, in punctuated events spanning >2.0 Ga.
DS201710-2235
2017
Gress, M.U.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.
DS201806-1233
2018
Gress, M.U.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.
DS201807-1495
2018
Gress, M.U.Gress, M.U., Pearson, D.G., Chinn, I.L., Koornneef, J.M., Pals, A.S.M., Van der Valk, E.A.S., Davies, G.R.Episodic eclogitic diamond genesis at Jwaneng diamond mine, Botswana.Goldschmidt2018, abstract 1p.Africa, Botswanadeposit - Jwaneng

Abstract: The diamondiferous Jwaneng kimberlite cluster (~240 Ma) is located on the NW rim of the Archaean Kaapvaal Craton in central Botswana. Previous studies report eclogitic diamond formation in the late Archean (2.9 Ga) and in the Middle Proterozoic (1.5 Ga) involving different mantle and sedimentary components [1;2;3]. Here we report newly acquired Sm- Nd ages of individual eclogitic pyrope-almandine and omphacite inclusions along with their major element data and nitrogen data from the diamond hosts to re-examine Jwaneng’s diamond formation ages. The Sm-Nd isotope analyses were performed via TIMS using 1013O resistors [4]. An initial suite of three pyropealmandine and 14 omphacite inclusions yield 143Nd/144Nd from 0.51102±7 to 0.5155±5. 147Sm/144Nd vary from 0.024 to 0.469. Major element data defines two inclusion populations: (1) seven omphacites with high Mg#, high Cr# and one pyropealmandine with low-Ca define an isochron age of 1.93±0.16 Ga with ?Ndi= +3.5; (2) seven omphacites with low Mg#, low Cr# and two pyrope-almandines with low-Ca define an isochron age of 0.82±0.06 Ga with ?Ndi= +3.7. Nitrogen contents of corresponding diamond host growth zones in Group (1) are = 50 at.ppm whereas Group (2) range between 50 to 700 at.ppm with N-aggregation > 70 %B. Additional data used to define “co-genetic” inclusion suites include Sr-isotopes and trace elements of the inclusions and carbon isotopes of the diamond hosts. Re-Os data of coexisting sulphide inclusions from the same silicate-bearing diamonds further validates the ages and indicates more periods of diamond formation at Jwaneng than previously assumed. The integrated data indicate the possibility of an extensive Paleoproterozoic diamond-forming event in southern Africa.
DS201809-2050
2018
Gress, M.U.Kohn, S.C., Speich, L., Bulanova, G.P., Smith, C.B., Gress, M.U., Davies, G.R.Modelling the temperature history of mantle lithosphere using FTIR maps of diamonds.Goldschmidt Conference, 1p. AbstractAfrica, Zimbabwe. Australia, Canada, Northwest Territories, South Africa, Botswanadeposit - Murowa, Argyle, Diavik, Venetia, Orapa

Abstract: FTIR maps of diamond plates, cut through the centre of growth, contain abundant information about changing defect concentrations from core to rim. These data can, in principle, be interpreted in terms of the variation in conditions of diamond growth and the temperatures experienced by the diamond during the period of mantle residence between growth and exhumation. Many diamonds show multiple growth zones that can be observed by cathodoluminescence. Importantly, the combination of nitrogen concentration and nitrogen aggregation measured by FTIR can be used to determine whether the growth zones are of similar or very different ages (Kohn et al., 2016). In this study, we use automated fitting of several thousand individual spectra within each FTIR map to define a model temperature for each pixel using the Python program, QUIDDIT. We then use a two-stage aggregation model to constrain potential temperature-time histories for each diamond. To take full advantage of the temperature history recorded by zoned diamonds, radiometric ages of inclusions are required. If the growth ages of each zone and the date of exhumation are well-known, then a model temperature can be calculated for each zone. The combination of zone-specific ages and improved quality and processing of FTIR spectra is able to provide unique new insights into the thermal history of diamondbearing lithospheric mantle. For the first time we will be able to use the N defects in diamonds to work out whether a particular location in the lithosphere has heated or cooled over long periods of geological time. The implications for the mechanism of formation of lithosphere will be discussed. We will illustrate the approach using examples of zoned diamonds from Murowa (Zimbabwe), Argyle (Australia), Diavik (Canada), Venetia (South Africa) and Orapa (Botswana).
DS201810-2308
2018
Gress, M.U.Davies, G.R., van den Heuvel, Q., Matveev, S., Drury, M.R., Chinn, I.L., Gress, M.U.A combined catholuminescence and electron backscatter diffraction examination of the growth relationships between Jwaneng diamonds and their eclogitic inclusions.Mineralogy and Petrology, doi.org/10.1007/s00710-018-0634-3 12p.Africa, Botswanadeposit - Jwaneng

Abstract: To fully understand the implications of the compositional information recorded by inclusions in diamond it is vital to know if their growth was syn- or protogenetic and the extent to which they have equilibrated with diamond forming agents. The current paradigm is that the majority of inclusions in diamond are syngenetic but recently this assumption has been questioned. This study presents an integrated cathodoluminescence (CL) and electron backscatter diffraction (EBSD) study of 8 diamonds containing eclogitic inclusions: 19 pyrope-almandine garnets, 12 omphacitic clinopyroxenes, 4 sulphides, 1 coesite and 1 rutile from the Jwaneng diamond mine, Botswana. Diamond plates were sequentially polished to expose inclusions at different levels and CL imaging and EBSD were performed to constrain the relationship between diamond and inclusion growth. Despite complex growth and resorption, individual diamonds are single crystals with a homogeneous crystallographic orientation. All individual inclusions have homogeneous crystallographic orientation and no resolvable compositional zonation. The combined CL and EBSD data suggest that epitaxial inclusion-diamond growth is rare (none of 24 inclusions) and that the imposition of cubo-octahedral faces on inclusions does not necessarily result in epitaxy. Individual diamonds contain inclusions that record evidence of both syngentic and protogenetic relationships with the host diamond and in one case an inclusion appears syngenetic to the diamond core but protogenetic to the growth zone that surrounds 70% of the inclusion. These findings emphasise that inclusions in diamonds have multiple modes of origin and that in order to validate the significance of geochronological studies, further work is needed to establish that there is rapid chemical equilibration of protogenetic inclusions with diamond forming agents at mantle temperatures.
DS201910-2261
2019
Gress, M.U.Gress, M.U., Smit, K.V., Chinn, I., Wang, W., Davies, G.R., Kornneef, J.M.Spectroscopic characteristics of Botswanan diamonds and their potential relationship with age.De Beers Diamond Conference, Not availableAfrica, Botswanadiamond growth zones
DS202011-2039
2020
Gress, M.U.Gress, M.U., Koorneef, J.M., Thomassot, E., Chinn, I.L., van Zuilen, K., Davies, G.R.Sm-Nd isochron ages coupled with C-N isotope data of eclogitic diamonds from Jwaneng, Botswana.Geochimica et Cosmochimica Acta, 10.1016/j.gca.2020.10.010 35p. PdfAfrica, Botswanadeposit - Jwaneng

Abstract: Constraining the formation age of individual diamonds from incorporated mineral inclusions and assessing the host diamonds’ geochemical characteristics allows determination of the complex history of diamond growth in the sub-continental lithospheric mantle (SCLM). It also provides the rare opportunity to study the evolution of the deep cycling of volatiles over time. To achieve these aims, Sm-Nd isotope systematics are presented for 36 eclogitic garnet and clinopyroxene inclusions from 16 diamonds from the Jwaneng mine, Botswana. The inclusions and host diamonds comprise at least two compositional suites that record different ‘mechanisms’ of diamond formation and define two isochrons, one Paleoproterozoic (1.8 Ga) and one Neoproterozoic (0.85 Ga). There are indications of at least three additional diamond-forming events whose ages currently cannot be well constrained. The Paleoproterozoic diamond suite formed by large-scale (> 100’s km), volatile-rich metasomatism related to formation and re-working of the Proto-Kalahari Craton. In contrast, the heterogeneous composition of the Neoproterozoic diamond suite indicates diamond formation on a small-scale, through local (< 10 km) equilibration of compositionally variable diamond-forming fluids in different eclogitic substrates during the progressive breakup of the Rodinia supercontinent. The results demonstrate that regional events appear to reflect the input of volatiles (i.e., carbon-bearing) derived from the asthenospheric mantle, whereas local diamond-forming events mainly promote the redistribution of volatiles within the SCLM. The occurrence of isotopically light carbon analysed in distinct growth zones from samples of this study (d13C < -21.1‰) provides further indication of a recycled origin for surface-derived carbon in some diamonds from Jwaneng. Determining Earth’s long-term deep carbon cycle using diamonds, however, requires an understanding of the nature and scale of specific diamond-forming events.
DS1994-1816
1994
Gresse, P.Unrug, R., Gresse, P., Wolmarana, L.Geodynamic map of Gondwana supercontinent assembly #1Geological Society of Australia Abstracts, No. 37, p. 440-1.GondwanaBrief overview
DS1993-0579
1993
Gresse, P.G.Gresse, P.G., Scheepers, R.Neoproterozoic to Cambrian (Namibian) rocks of South Africa: a geochronological and geotectonic reviewJournal of African Earth Sciences, Vol. 16, No. 4, pp. 375-393South AfricaGeochronology, Tectonics
DS1998-0532
1998
Gresse, P.G.Gresse, P.G., Thomas, R.J., De Beer, C.H., De Kock, G.S.The development of the Anti Atlas Orogen, Morocco: parallels with the Pan-African belts of southern AfricaJournal of African Earth Sciences, Vol. 27, 1A, p. 92. AbstractMoroccoOrogeny
DS2000-0361
2000
Gresse, P.G.Gresse, P.G., Silva, L.C., et al.The Neoproterozoic orogenic systems of western Gondwana in southern Africa and southern Brasil.Igc 30th. Brasil, Aug. abstract only 1p.Brazil, South AfricaGeodynamics - tectnics, Gondwanaland
DS2003-0501
2003
Gresse, P.G.Gresse, P.G.The preservation of alluvial diamond deposits in abandoned meanders of the middleJournal South African Institute of Mining and Metallurgy, Vol. 103, 9, pp. 535-38 Ingenta 1035419926South AfricaBlank
DS200412-0718
2003
Gresse, P.G.Gresse, P.G.The preservation of alluvial diamond deposits in abandoned meanders of the middle Orange River.Journal of the South African Institute of Mining and Metallurgy, Vol. 103, 9, pp. 535-38 Ingenta 1035419926Africa, South AfricaAlluvials
DS2002-1669
2002
Grevemeyer, I.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
DS1996-0036
1996
Grew, E.S.Anovitz, L.M., Grew, E.S.Mineralogy, petrology and geochemistry of boron: an introductionReviews in Mineralogy, Vol. 33, pp. 1-40GlobalBoron, Mineralogy
DS201511-1842
2015
Grew, E.S.Hazen, R.M., Hystad, G., Downs, R.T., Golden, J.J., Pires, A.J., Grew, E.S.Earth's missing minerals.American Mineralogist, Vol. 100, pp. 2344-2347.TechnologyMineralogy

Abstract: Recent studies of mineral diversity and distribution lead to the prediction of >1563 mineral species on Earth today that have yet to be described-approximately one fourth of the 6394 estimated total mineralogical diversity. The distribution of these "missing" minerals is not uniform with respect to their essential chemical elements. Of 15 geochemically diverse elements (Al, B, C, Cr, Cu, Mg, Na, Ni, P, S, Si, Ta, Te, U, and V), we predict that approximately 25% of the minerals of Al, B, C, Cr, P, Si, and Ta remain to be described - a percentage similar to that predicted for all minerals. Almost 35% of the minerals of Na are predicted to be undiscovered, a situation resulting from more than 50% of Na minerals being white, poorly crystallized, and/or water soluble, and thus easily overlooked. In contrast, we predict that fewer than 20% of the minerals of Cu, Mg, Ni, S, Te, U, and V remain to be discovered. In addition to the economic value of most of these elements, their minerals tend to be brightly colored and/or well crystallized, and thus likely to draw attention and interest. These disparities in percentages of undiscovered minerals reflect not only natural processes, but also sociological factors in the search, discovery, and description of mineral species.
DS201905-1015
2019
Grew, E.S.Antonelli, M.A., DePaolo, D.J., Chacko, T., Grew, E.S., Rubatto, D.Radiogenic Ca isotope confirms post-formation K depletion of lower crust.Geochemical Perspective Letters, Vol. 10, pp. 43-48. doi:10.7185/ geochemlet.1904Mantlexenoliths

Abstract: Heat flow studies suggest that the lower crust has low concentrations of heat-producing elements. This could be due to either (i) greater fractions of basaltic rock at depth or (ii) metamorphic depletion of radioactive elements from rocks with more evolved (andesitic to granodioritic) compositions. However, seismic data suggest that lower crust is not predominantly basaltic, and previous studies (using Pb and Sr isotopes) have shown that lower crustal rocks have experienced significant losses of U and Rb. This loss, however, is poorly constrained for K, which is inferred to be the most important source of radioactive heat in the earliest crust. Our high precision Ca isotope measurements on a suite of granulite facies rocks and minerals from several localities show that significant losses of K (~60 % to >95 %) are associated with high temperature metamorphism. These results support models whereby reduction of heat production from the lower crust, and consequent stabilisation of continental cratons in the Precambrian, are largely due to high temperature metamorphic processes. Relative changes in whole rock K/Ca suggest that 20-30 % minimum (granitic) melt removal can explain the K depletions.
DS201809-2104
2018
Grewal, D.S.Tsuno, K., Grewal, D.S., Dasgupta, R.Core mantle fractionation of carbon in Earth and Mars: the effects of sulfur.Geochimica et Cosmochimica Acta, Vol. 238, pp. 477-495.Mantlecarbon

Abstract: Constraining carbon (C) fractionation between silicate magma ocean (MO) and core-forming alloy liquid during early differentiation is essential to understand the origin and early distribution of C between reservoirs such as the crust-atmosphere, mantle, and core of Earth and other terrestrial planets. Yet experimental data at high pressure (P)-temperature (T) on the effect of other light elements such as sulfur (S) in alloy liquid on alloy-silicate partitioning of C and C solubility in Fe-alloy compositions relevant for core formation is lacking. Here we have performed multi-anvil experiments at 6-13?GPa and 1800-2000?°C to examine the effects of S and Ni on the solubility limit of C in Fe-rich alloy liquid as well as partitioning behavior of C between alloy liquid and silicate melt (). The results show that C solubility in the alloy liquid as well as decreases with increasing in S content in the alloy liquid. Empirical regression on C solubility in alloy liquid using our new experimental data and previous experiments demonstrates that C solubility significantly increases with increasing temperature, whereas unlike in S-poor or S-free alloy compositions, there is no discernible effect of Ni on C solubility in S-rich alloy liquid. Our modelling results confirm previous findings that in order to satisfy the C budget of BSE, the bulk Earth C undergoing alloy-silicate fractionation needs to be as high as those of CI-type carbonaceous chondrite, i.e., not leaving any room for volatility-induced loss of carbon during accretion. For Mars, on the other hand, an average single-stage core formation at relatively oxidized conditions (1.0 log unit below IW buffer) with 10-16?wt% S in the core could yield a Martian mantle with a C budget similar to that of Earth’s BSE for a bulk C content of ~0.25-0.9?wt%. For the scenario where C was delivered to the proto-Earth by a S-rich differentiated impactor at a later stage, our model calculations predict that bulk C content in the impactor can be as low as ~0.5?wt% for an impactor mass that lies between 9 and 20% of present day Earth’s mass. This value is much higher than 0.05-0.1?wt% bulk C in the impactor predicted by Li et al. (Li Y., Dasgupta R., Tsuno K., Monteleone B., and Shimizu N. (2016) Carbon and sulfur budget of the silicate Earth explained by accretion of differentiated planetary embryos. Nat. Geosci.9, 781-785) because C-solubility limit of 0.3?wt% in a S-rich alloy predicted by their models is significantly lower than the experimentally derived C-solubility of ~1.6?wt% for the relevant S-content in the core of the impactor.
DS201902-0274
2019
Grewal, D.S.Grewal, D.S., Dasgupta, R., Sun, C., Tsuno, K., Costin, G.Delivery of carbon, nitrogen, and sulfur to the silicate Earth by a giant impact.Science Advances, Vol. 5, 1, Jan. 23, 10.1126/sciadv.aau3669 13p.Mantlecrater

Abstract: Earth’s status as the only life-sustaining planet is a result of the timing and delivery mechanism of carbon (C), nitrogen (N), sulfur (S), and hydrogen (H). On the basis of their isotopic signatures, terrestrial volatiles are thought to have derived from carbonaceous chondrites, while the isotopic compositions of nonvolatile major and trace elements suggest that enstatite chondrite-like materials are the primary building blocks of Earth. However, the C/N ratio of the bulk silicate Earth (BSE) is superchondritic, which rules out volatile delivery by a chondritic late veneer. In addition, if delivered during the main phase of Earth’s accretion, then, owing to the greater siderophile (metal loving) nature of C relative to N, core formation should have left behind a subchondritic C/N ratio in the BSE. Here, we present high pressure-temperature experiments to constrain the fate of mixed C-N-S volatiles during core-mantle segregation in the planetary embryo magma oceans and show that C becomes much less siderophile in N-bearing and S-rich alloys, while the siderophile character of N remains largely unaffected in the presence of S. Using the new data and inverse Monte Carlo simulations, we show that the impact of a Mars-sized planet, having minimal contributions from carbonaceous chondrite-like material and coinciding with the Moon-forming event, can be the source of major volatiles in the BSE.
DS201904-0741
2019
Grewal, D.S.Grewal, D.S., Dasgupta, R., Holmes, A.K., Costin, G., Li, Y., Tsuno, K.The fate of nitrogen during core-mantle seperation on Earth.Geochimica et Cosmochimica Acta, Vol. 251. pp. 87-115.Mantlenitrogen

Abstract: Nitrogen, the most dominant constituent of Earth’s atmosphere, is critical for the habitability and existence of life on our planet. However, its distribution between Earth’s major reservoirs, which must be largely influenced by the accretion and differentiation processes during its formative years, is poorly known. Sequestration into the metallic core, along with volatility related loss pre- and post-accretion, could be a critical process that can explain the depletion of nitrogen in the Bulk Silicate Earth (BSE) relative to the primitive chondrites. However, the relative effect of different thermodynamic parameters on the alloy-silicate partitioning behavior of nitrogen is not well understood. Here we present equilibrium partitioning data of N between alloy and silicate melt () from 67 new high pressure (P?=?1-6?GPa)-temperature (T?=?1500-2200?°C) experiments under graphite saturated conditions at a wide range of oxygen fugacity (logfO2?~??IW -4.2 to -0.8), mafic to ultramafic silicate melt compositions (NBO/T?=?0.4 to 2.2), and varying chemical composition of the alloy melts (S and Si contents of 0-32.1?wt.% and 0-3.1?wt.%, respectively). Under relatively oxidizing conditions (~?IW -2.2 to -0.8) nitrogen acts as a siderophile element ( between 1.1 and 52), where decreases with decrease in fO2 and increase in T, and increases with increase in P and NBO/T. Under these conditions remains largely unaffected between S-free conditions and up to ~17?wt.% S content in the alloy melt, and then drops off at >~20?wt.% S content in the alloy melt. Under increasingly reduced conditions (<~?IW -2.2), N becomes increasingly lithophile ( between 0.003 and 0.5) with decreasing with decrease in fO2 and increase in T. At these conditions, fO2 along with Si content of the alloy under the most reduced conditions (<~?IW -3.0), is the controlling parameter with T playing a secondary role, while, P, NBO/T, and S content of the alloy have minimal effects. A multiple linear least-squares regression parametrization for based on the results of this study and previous studies suggests, in agreement with the experimental data, that fO2 (represented by Si content of the alloy melt and FeO content of the silicate melt), followed by T, has the strongest control on . Based on our modeling, to match the present-day BSE N content, impactors that brought N must have been moderately to highly oxidized. If N bearing impactors were reduced, and/or there was significant disequilibrium core formation, then the BSE would be too N-rich and another mechanism for N loss, such as atmospheric loss, would be required.
DS201905-1036
2019
Grewal, D.S.Grewal, D.S., Dasgupta, R., Holems, A.K., Costin, G., Li, Y., Tsuno, K.The fate of nitrogen during core-mantle separation on Earth.Geochimica et Cosmochimica Acta, Vol. 251, pp. 87-115.Mantlenitrogen

Abstract: Nitrogen, the most dominant constituent of Earth’s atmosphere, is critical for the habitability and existence of life on our planet. However, its distribution between Earth’s major reservoirs, which must be largely influenced by the accretion and differentiation processes during its formative years, is poorly known. Sequestration into the metallic core, along with volatility related loss pre- and post-accretion, could be a critical process that can explain the depletion of nitrogen in the Bulk Silicate Earth (BSE) relative to the primitive chondrites. However, the relative effect of different thermodynamic parameters on the alloy-silicate partitioning behavior of nitrogen is not well understood. Here we present equilibrium partitioning data of N between alloy and silicate melt () from 67 new high pressure (P?=?1-6?GPa)-temperature (T?=?1500-2200?°C) experiments under graphite saturated conditions at a wide range of oxygen fugacity (logfO2?~??IW -4.2 to -0.8), mafic to ultramafic silicate melt compositions (NBO/T?=?0.4 to 2.2), and varying chemical composition of the alloy melts (S and Si contents of 0-32.1?wt.% and 0-3.1?wt.%, respectively). Under relatively oxidizing conditions (~?IW -2.2 to -0.8) nitrogen acts as a siderophile element ( between 1.1 and 52), where decreases with decrease in fO2 and increase in T, and increases with increase in P and NBO/T. Under these conditions remains largely unaffected between S-free conditions and up to ~17?wt.% S content in the alloy melt, and then drops off at >~20?wt.% S content in the alloy melt. Under increasingly reduced conditions (<~?IW -2.2), N becomes increasingly lithophile ( between 0.003 and 0.5) with decreasing with decrease in fO2 and increase in T. At these conditions, fO2 along with Si content of the alloy under the most reduced conditions (<~?IW -3.0), is the controlling parameter with T playing a secondary role, while, P, NBO/T, and S content of the alloy have minimal effects. A multiple linear least-squares regression parametrization for based on the results of this study and previous studies suggests, in agreement with the experimental data, that fO2 (represented by Si content of the alloy melt and FeO content of the silicate melt), followed by T, has the strongest control on . Based on our modeling, to match the present-day BSE N content, impactors that brought N must have been moderately to highly oxidized. If N bearing impactors were reduced, and/or there was significant disequilibrium core formation, then the BSE would be too N-rich and another mechanism for N loss, such as atmospheric loss, would be required.
DS1981-0317
1981
Grey, A.Nixon, P.H., Rogers, N.W., Gibson, I.L., Grey, A.Depleted and Fertile Mantle Xenoliths from Southern Africankimberlites.Annual Review of Earth and Planetary Science, Vol. 9, PP. 285-309.South AfricaKimberlite Genesis
DS200412-0719
2004
Grey, E.Grey, E., Clancy, J.The never ending story: human error and beyond.AUSIMM Bulletin, March-April, p. 60-62.AustraliaWork place environment
DS1975-0732
1978
Grey, G.P.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
DS1987-0515
1987
Grey, I.E.Nickel, E.H., Grey, I.E., MadsenLucasite-(Ce),CeTi2(O, Oh06; a new mineral from WesternAustralia: its description and structureAmerican Mineralogist, Vol. 72, pp. 1006-1010Australia, LucasiteLamproite
DS1987-0516
1987
Grey, I.E.Nickel, E.H., Grey, I.E., Madsen, I.C.Lucasite (Ce) CeTi2 (O, OH)6 a new mineral from Western Australia: its description and structure.American Miner., Vol. 72, pp. 1006-10.AustraliaMineralogy, Lucasite, Deposit - Argyle mine
DS1998-0533
1998
Grey, I.E.Grey, I.E., Velde, D., Criddle, A.J.Haggertyite, a new magnetoplumbite type titanate mineral from the Prairie Creek (Arkansaw) lamproite.American Mineralogist, Vol. 83, pp. 1323-9.ArkansasLamproite - mineralogy, Deposit - Prairie Creek
DS1996-0565
1996
Grezechnik, A.Grezechnik, A., Zimmermann, H.D., McMillan, P.F.FTIR micro-reflectance measurements of the CO2/3 ion content in basanite and leucitite glasses.Contributions to Mineralogy and Petrology, Vol. 125, No. 4, pp. 311-318.GlobalBasanite
DS200712-0849
2007
Grgeoire, M.Poitrasson, F., Delpech, G., Grgeoire, M., Moine, B.N.Significance of the mantle Fe isotope variations.Plates, Plumes, and Paradigms, 1p. abstract p. A799.Africa, South AfricaXenoliths
DS2001-1316
2001
Grhan, S.A.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
DS201112-0727
2010
Grib, E.N.Naumov, V.B., Tolstykh, M.L., Grib, E.N., Leonov, V.L., Kononkova, N.N.Chemical composition, volatile components, and trace elements in melts of the Karymskii volcanic centre, Kamchatka and Golovnin a volcano, Kunashir Island....Vladykin, N.V., Deep Seated Magmatism: its sources and plumes, pp. 104-127.RussiaMineral inclusions
DS1994-1619
1994
Grib, V.Sinitsyn, A.V., Ermolaeva, L., Grib, V.The Arkangelsk diamond kimberlite province - a recent discovery in The north of the east European PlatformProceedings of Fifth International Kimberlite Conference, Vol. 1, pp. 27-33.Russia, Commonwealth of Independent States (CIS)European platform, kimberlites, Deposit -Arkangelsk
DS1991-1595
1991
Grib, V.P.Sinitsyn, A.V., Ermolaeva, L.A., Grib, V.P.The Arkhangelsk diamond kimberlite province - a recent discovery in The north of the East-European PlatformProceedings of Fifth International Kimberlite Conference held Araxa June 1991, Servico Geologico do Brasil (CPRM) Special, pp. 367-369RussiaNenoksa, Arkhangelsk, Mela River, Pomorskaya, Pionerskaya, Zolotitsa, Verkhotinskaya, Poltozero, Winter Coast
DS1992-1416
1992
Grib, V.P.Sinitsyn, A.V., Dauev, Yu.M., Grib, V.P.Structural setting and productivity of the kimberlites of the Arkhangelsk province #2Russian Geology and Geophysics, Vol. 33, No. 10, pp. 61-70.Russia, Commonwealth of Independent States (CIS), ArkangelskStructure, Kimberlites
DS1992-1417
1992
Grib, V.P.Sinitsyn, A.V., Dauev, Yu.M., Grib, V.P.Structural setting and productivity of the kimberlites of the ArkangelskProvince.Russian Geology and Geophysics, Vol. 33, No. 10, pp. 61-70.Russia, ArkangelskTectonics, Structure
DS1992-1449
1992
Grib, V.P.Sobolev, N.V., Pokhilenko, N.P., Grib, V.P., Skripnichenko, V.A.Specific composition and conditions of formation of deep seated mineralsRussian Geology and Geophysics, Vol. 33, No. 10, pp. 71-78.Russia, Commonwealth of Independent States (CIS), Arkangelsk, RussiaZolotisa Field, Tectonics, Explosion pipes, Kimberlites
DS201312-0334
2013
Griban, J.G.Griban, J.G., Samsonov, A.V., Salnikov, E.B., Lepehina, E.N.Kimberlitic zircons from the Paleoproterozoic Kimzero kimberlites ( Karelia): mineralogy, geochemistry and U-Pb geochronology.Goldschmidt 2013, AbstractRussia, KareliaDeposit - Kimozero
DS201312-0775
2013
Griban, J.G.Samsonov, A.V., Griban, J.G., Larionova, Y.O., Nosova, A.A., Tretyachenko, V.V.Evolution of deep crustal roots of the Arhangelsk Diamondiferous province: evidences from crustal xenoliths and xenocrysts from Devonian kimberlite pipes.Goldschmidt 2013, 1p. AbstractRussia, Kola PeninsulaDeposit - Arkangel
DS201507-0333
2015
Griban, Yu.G.Sazonova, L.V., Nosova, A.A., Kargin, A.V., Borisovskiy, S.E., Tretyachenko, V.V., Abazova, Z.M., Griban, Yu.G.Olivine from the Pionerskaya and V. Grib kimberlite pipes, Arkangelsk diamond province, Russia: types, composition, and origin.Petrology, Vol. 23, 3, pp. 227-258.RussiaDeposit - Grib
DS1860-0246
1875
Gribble, J.D.B.Gribble, J.D.B.A Manual of the District of Cuddapah in the Presidency of Madras.Cuddapah District Manual, IndiaRegional Geology
DS202101-0012
2020
Gribkoff, E.Gribkoff, E.Geologists shed light on the mantle with 3D model.EOS, 101, doi.org/10.1029/2020EOE152364 Dec. 4, 2p.Mantlegeophysics - seismics

Abstract: The model, which will incorporate 227 million surface wave measurements, could help with everything from earthquake characterization to neutrino geosciences.
DS201412-0443
2014
Griboedova, I.Kargin, A., Nosova, A., Larionova, Yu., Kononova, V., Borisovsky, S., Kovalchuk, E., Griboedova, I.Mesoproterozoic orangeites ( Kimberlites II) of west Karelia: mineralogy, geochemistry and Sr-Nd isotope composition.Petrology, Vol. 22, 2, pp. 151-183.RussiaOrangeites
DS1984-0315
1984
Grice, J.D.Grice, J.D., Robinson, G.W.Jeffreyite, (ca Na2) (be Al) Si2 (o Oh)7 a New Mineral Species and its Relation to the Melilite Group.Canadian Mineralogist., Vol. 22, PP. 443-446.Canada, QuebecJeffreyite, Melilite Group
DS1990-0602
1990
Grice, J.D.Grice, J.D., Boxer, G.L.Diamonds from Kimberley, Western AustraliaThe Mineralogical Record, Vol. 21, No. 6, November-December pp. 559-564AustraliaHistory, Diamonds morphology
DS200412-1535
2004
Grice, J.D.Petersen, O.V., Johnsen, O., Gault, R.A., Niedermayr, G., Grice, J.D.Taseqite, a new member of the eudialyte group from the Ilmassaq alkaline complex.Neues Jahrbuch fur Mineralogie - Monatshefte, No. 2, Feb. 1, pp. 83-96.Europe, GreenlandMineralogy
DS2001-1248
2001
GrienwaldWonik, T., Trippler, Geipel, Grienwald, PashkevitchMagnetic anomaly map for northern western and eastern EuropeTerra Nova, Vol. 13, pp. 203-13.EuropeGeophysics - magnetics
DS1992-0611
1992
Grier, R.Grier, R.Building sustainability into our economic decisionsCrs Perspectives, No. 41, November pp. 17-22CanadaEconomics, General
DS200912-0171
2009
Grierson, A.Di Francesco, D., Grierson, A., Kaputa, D., Meyer, T.Gravity gradiometer systems - advances and challenges.Geophysical Prospecting, Vol. 57, 4, pp. 615-623.TechnologyGradiometers - not specific to diamonds
DS1984-0316
1984
Gries, J.C.Gries, J.C.Tectonic History of Part of the Central Stable Region of The Midcontinent Area.Geological Society of America (GSA), Vol. 16, No. 2, FEBRUARY P. 85. (abstract.).KansasMid-continent
DS1989-1152
1989
Griesshaber, E.O'Nions, R.K., Griesshaber, E., Oxburgh, E.R.Rocks that are too hot to handleNature, Vol. 341, No. 6241, October 5, p. 391GlobalMantle, Magma
DS2003-0258
2003
Griesshaber, E.Clauser, C., Griesshaber, E., Neugebauer, H.J.Decoupled thermal and mantle helium anomalies: implications for the transport regime inJournal of Geophysical Research, Vol. 107, 11, Nov. 6, pp. DO1 10.1029/2001JB000675MantleTectonics, Geothermometry
DS200412-0334
2003
Griesshaber, E.Clauser, C.,Griesshaber, E., Neugebauer, H.J.Decoupled thermal and mantle helium anomalies: implications for the transport regime in continental rift zones.Journal of Geophysical Research, Vol. 107, 11, Nov. 6, pp. DO1 10.1029/2001 JB000675MantleTectonics, geothermometry
DS201903-0526
2019
Griev, R.Latypov, R., Chisryakova, S., Griev, R., Huhma, H.Evidence for igneous differentiation in Sudbury Igneous Complex and impact driven evolution of Terrestrial planet proto-crusts.Nature Communications, Vol. 10, # 508, pp. 1-13.Canada, Ontariometeorite

Abstract: Bolide impact is a ubiquitous geological process in the Solar System, which produced craters and basins filled with impact melt sheets on the terrestrial planets. However, it remains controversial whether these sheets were able to undergo large-scale igneous differentiation, or not. Here, we report on the discovery of large discrete bodies of melanorites that occur throughout almost the entire stratigraphy of the 1.85-billion-year-old Sudbury Igneous Complex (SIC) - the best exposed impact melt sheet on Earth - and use them to reaffirm that conspicuous norite-gabbro-granophyre stratigraphy of the SIC is produced by fractional crystallization of an originally homogeneous impact melt of granodioritic composition. This implies that more ancient and compositionally primitive Hadean impact melt sheets on the Earth and other terrestrial planets also underwent large-volume igneous differentiation. The near-surface differentiation of these giant impact melt sheets may therefore have contributed to the evolution and lithological diversity of the proto-crust on terrestrial planets.
DS1981-0194
1981
Grieve, D.A.Grieve, D.A.Diatreme Breccias in the Southern Rocky MountainsBritish Columbia Report of Fieldwork, FOR 1980, PP. 97-103.Canada, British Columbia, Crossing CreekPetrography
DS1985-0251
1985
Grieve, D.A.Grieve, D.A.1980- Petrology and Chemistry of the Cross KimberliteBritish Columbia Department of Mines Publishing, 1977-1981, PP. 34-41.Canada, British Columbia, PennsylvaniaStructure, Petrology, Analyses, Cehmistry, Petrogenesis
DS1995-0680
1995
Grieve, R.Grieve, R., Rupert, J., Smith, J., Thierriault, A.The record of terrestrial impact crateringGsa Today, Vol. 5, No. 10, Oct. pp. 189, 194-196.GlobalCraters -impact craters, Distribution, morphology
DS1987-0735
1987
Grieve, R.A.F.Thomas, M.D., Sharpton, V.L., Grieve, R.A.F.Gravity patterns and Precambrian structure in the North American centralplainsGeology, Vol. 15, No. 6, June pp. 489-492MidcontinentGeophysics, Tectonics
DS1988-0269
1988
Grieve, R.A.F.Grieve, R.A.F.Terrestrial impact craters; their recognition, nature and effectsRevista Geofiscica, Vol. 28, pp. 145-178GlobalImpact cratering, Review
DS1989-0546
1989
Grieve, R.A.F.Grieve, R.A.F.Hyper velocity impact cratering: a catastrophic terrestrial geologicprocessCatastrophes and evolution: Astronomical Foundations; S.V.M. Clube, Royal Astron. Society, 1989 pp. 57-79GlobalImpact cratering
DS1989-0547
1989
Grieve, R.A.F.Grieve, R.A.F., Adams, J., Goodacre, A.K., Nevitt, L., TeskeyThe Canadian geophysical atlasGeological Society of Canada (GSC) Forum 1989, P. 12 abstractOntarioGeophysical atlas
DS1989-1217
1989
Grieve, R.A.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
DS1990-0181
1990
Grieve, R.A.F.Bechtel, T.D., Forsyth, D.W., Sharpton, V.L., Grieve, R.A.F.Variations in effective elastic thickness of the NorthAmericanlithosphereNature, Vol. 343, No. 6259, February 15, pp. 636-638MidcontinentGeophysics, Bouguer gravity
DS1990-0485
1990
Grieve, R.A.F.Forsyth, D.A., Pilkington, M., Grieve, R.A.F., Abbinett, D.Major circular structure beneath southern Lake Huron defined from potential field dataGeology, Vol. 18, No. 8, August pp. 773-777Ontario, Great LakesGeophysics -aeromagnetics, Tectonics
DS1990-0603
1990
Grieve, R.A.F.Grieve, R.A.F.Impact cratering on the earthScientific American, April pp. 66-73GlobalImpact cratering, Meteorites
DS1991-1448
1991
Grieve, R.A.F.Roest, W.R., Rupert, J.D., Grieve, R.A.F., Goodacre, A.K.Structural aspects of North America in the context of the World Bougueranomaly mapGeological Survey of Canada Forum held January 21-23, 1990 in Ottawa, p. 14 AbstractGlobalGeophysics -Gravity, Map
DS1991-1716
1991
Grieve, R.A.F.Thomas, M.D., Grieve, R.A.F., Sharpton, V.L.Structural fabric of the North American continent, as defined by gravity trends #1Proceedings of the Seventh International Conference on Basement, pp. 257-276.United States, CanadaRifting, Structure, tectonics, lineaments
DS1992-1200
1992
Grieve, R.A.F.Pilkington, M., Grieve, R.A.F.The geophysical signature of terrestrial impact cratersReviews of Geophysics, Vol. 30, No. 2, May pp. 161-181CanadaGeophysics -gravity, Impact craters
DS1993-0580
1993
Grieve, R.A.F.Grieve, R.A.F.Impact craters: lessons from and for the earthVistas in Astronomy, Vol. 36, pp. 203-230.GlobalAstronomy - solar system, Impact craters
DS1993-0581
1993
Grieve, R.A.F.Grieve, R.A.F.Impact craters: when will enough be enough?Nature, Vol. 363, No. 6431, June 24, pp. 670-671GlobalImpact craters
DS1993-0582
1993
Grieve, R.A.F.Grieve, R.A.F.Impact craters: lessons from and for the earthVistas in Astronomy, Vol. 36, pp. 203-230QuebecImpact craters
DS1994-0660
1994
Grieve, R.A.F.Grieve, R.A.F.Impact: a natural hazard in planetary evolutionEpisodes, Vol. 17, No. 1/2, pp. 9-17GlobalImpacts
DS1994-0661
1994
Grieve, R.A.F.Grieve, R.A.F., Masaitis, V.L.The economic potential of terrestrial impact cratersInternational Geology Review, Vol. 36, No. 2, February pp. 105-151.GlobalDistribution -impact craters, Review
DS1994-0662
1994
Grieve, R.A.F.Grieve, R.A.F., Masaitis, V.L.The economic potential of terrestrial impact cratersInternational Geology Review, Vol. 36, No. 2, February pp. 105-151GlobalImpact craters
DS1995-0443
1995
Grieve, R.A.F.Dressler, B.O., Grieve, R.A.F., Sharpton, V.L.Large meteorite impacts and planetary evolutionGeological Society of America (GSA) Special Paper, No. 293, 358p. $ 100.00GlobalBook -ad, Meteorites
DS1996-0566
1996
Grieve, R.A.F.Grieve, R.A.F., Masaitis, V.L.Impact diamondsGeological Survey of Canada, LeCheminant ed, OF 3228, pp. 183-186.CanadaImpact structure, Carbonados
DS200612-0498
2006
Grieve, R.A.F.Grieve, R.A.F., Cintala, M.J., Therriault, A.M.Large scale impacts and the evolution of the Earth's crust: the early years.Geological Society of America, Processes on the Earth, Special Paper 405, Chapter 2.MantleImpact processes
DS201312-0345
2013
Grieve, R.A.F.Gulick, S.P.S., Christeson, G.L., Barton, P.J., Grieve, R.A.F., Morgan, J.V., Urrutia-Fucugauchi, J.Geophysical characterization of the Chicxulub impact crater.Reviews of Geophysics, Vol. 51, 1, pp. 31-52.United States, MexicoMeteorite
DS1989-0559
1989
Grieveso..P.Gupta, S.K., Rajakuma.., V., Grieveso..P.The influence of weathering on the reduction of ilmenite with carbonMetall. T-B., Vol. 20, No. 5, October pp. 735-745. AX896GlobalIlmenite -general, Weathering
DS1992-0612
1992
Griffen, D.T.Griffen, D.T.Silicate crystal chemistryBlackwell Scientific, 416pGlobalChemistry -silicates, Book -ad
DS1985-0473
1985
Griffen, M.E.Mutschler, F.E., Griffen, M.E., Stevens, D.S., Shannon, S.S.JR.Precious metal deposits related to alkaline rocks in the North American Cordillera- an interpretative reviewTransactions Geological Society of South Africa, Vol. 88, pp. 355-377United StatesCordillera, Carbonatite
DS1975-1038
1979
Griffen, W.L.Griffen, W.L., Carswell, D.A., Nixon, P.H.Lower Crustal Granulites and Eclogites from LesothoProceedings of Second International Kimberlite Conference, Proceedings Vol. 2, PP. 59-86.LesothoPetrology
DS1986-0306
1986
Griffen, W.L.Griffen, W.L., O'Reilley, S.Y.Mantle drived sapphirineMineralogical Magazine, Vol. 50, December pp. 635-640AustraliaDelegate, Breccia
DS1986-0307
1986
Griffen, W.L.Griffen, W.L., Qvale, H.Superferrian eclogites and the crustal origin of garnet peridotites, Almklovdalen, NorwayThe Caledonide Orogen-Scandinavia and Related areas, Gee, D.G. and, pp. 803-812NorwayEclogites, Garnet Peridotites
DS1992-0613
1992
Griffen, W.L.Griffen, W.L., Ryan, C.G.Trace elements in garnets and chromites: their use in diamond exploration #3Preprint of paper to be presented Roundtable in India, November 25th., `6p. 1 table 15 figuresGlobalGeothermometry, Mineral chemistry -garnets, chromites
DS1995-1889
1995
Griffen, W.L.Taylor, W.R., Milledge, H.J., Griffen, W.L., Nixon, P.h.Characteristics of microdiamonds from ultramafic massifs in Tibet:authentic ophiolitic diamonds.....Proceedings of the Sixth International Kimberlite Conference Abstracts, pp. 623-624.China, TibetMicrodiamonds, Metamorphic
DS1998-0017
1998
GriffinAlard, O., Luguet, Lorand, Powell, O'Reilly, GriffinFurther insights on S content and behaviour in the lithospheric mantleMineralogical Magazine, Goldschmidt abstract, Vol. 62A, pp. 29-30.Australia, FranceSulphide mineralogy, Xenoliths
DS1998-0172
1998
GriffinBrown, R.W., Gallagher, Griffin, Ryan, De Wit, BeltonKimberlites, accelerated erosion and evolution of the lithospheric mantle beneath Kaapvaal - mid-Cretaceous..7th International Kimberlite Conference Abstract, pp. 105-107.South AfricaHeat flow data, uplift, Kaapvaal Craton
DS1998-1139
1998
GriffinPearson, N.J., Griffin, Kaminsky, Van AchterberghTrace element discrimination of garnet from Diamondiferous kimberlites andlamproites.7th. Kimberlite Conference abstract, pp. 673-5.South Africa, Russia, Siberia, Yakutia, Venezuela, GhanaGeochemistry, Garnets
DS1999-0545
1999
GriffinPearson, Griffin, Doyle, O'Reilly, Van Acterbergh, KiviXenoliths from kimberlite pipes of the Lac de Gras area, Slave Craton, Canada. (DO18, 27, A154S)7th International Kimberlite Conference Nixon, Vol. 2, pp. 644-58.Northwest TerritoriesPetrography, mineral chemistry, analyses, thermometry
DS2000-0374
2000
GriffinGwalani, L.G., Rock, N.M.S., Ramasamy, Griffin, MulaiComplexly zoned Ti rich melanite schorlomite garnets from Ambadungar carbonatite alkalic complex, DeccanJournal of Asian Earth Science, Vol. 18, No.2, Apr. pp.163-76.India, Gujarat, WesternCarbonatite, Deposit - Ambadungar
DS2000-0465
2000
GriffinKaminsky, F.V., Zakharchenko, Griffin, Channer BlinovaDiamond from the Guaniamo area, VenezuelaCanadian Mineralogist, Vol. 38, no, 6, Dec. pp. 1347-70.VenezuelaDiamond morphology, Mineral inclusions
DS2000-1040
2000
GriffinYatsenko, G.M., Panov, Belousoba, Lesnov, GriffinThe rare earth elements (REE) distribution in zircon from minettes of the Kirovograd Ukraine.Doklady Academy of Sciences, Vol. 370, No. 1, Jan-Feb pp.196-200.Russia, UkraineGeochronology, Minettes
DS2001-0062
2001
GriffinAulbach, S., Griffin, Pearson, O'Reilly, Doyle, KiviRe Os isotope evidence for Meso-Archean mantle beneath 2.7 Ga Contwoyto Terrane, implications tectonic historySlave-Kaapvaal Workshop, Sept. Ottawa, 5p. abstractMantleGeochemistry - major, trace elements, Slave Craton - tectonics
DS2001-0181
2001
GriffinChen, S., O'Reilly, S., Zhou, Griffin, Zhang, Sun, FengThermal and petrological structure of the lithosphere beneath Hannuoba, Sino Korean Craton, evidence xenolithLithos, Vol. 56, pp. 267-301.ChinaXenoliths, trace elements, structure
DS2001-0567
2001
GriffinKaminsky, F.V., Zakharchenko, O.D., Davies, R., GriffinSuperdeep diamonds from the Juin a area, Mato Grosso State, BrasilContributions to Mineralogy and Petrology, Vol. 140, pp. 734-53.GlobalDiamond - morphology, alluvial, ultra high pressure (UHP), Mineral chemistry
DS2001-0897
2001
GriffinPearson, N.J., Griffin, Spetsius, O'ReillyIn situ Re Os analysis of mantle sulphides: a new microanalytical technique to unravel the evolution...Slave-Kaapvaal Workshop, Sept. Ottawa, 6p. abstractRussia, Siberia, YakutiaGeochronology, Deposit - Udachnaya
DS2001-0999
2001
GriffinRyan, C.G., Can Achterberg, Griffin, Pearson, O'ReillyNuclear microprobe analysis of melt inclusions in minerals: windows on metasomatic processes in mantleNuclear Instruments and Methods, Phys. Res. B., Vo.l81, pp. 578-85.MantleMetasomatism
DS2001-1178
2001
GriffinVan Achterbergh, A.E., Griffin, Kivi, Pearson, O'ReillyCarbonatites at 200 km: quenched melt inclusions in megacrystalline lherzolite xenoliths Slave Craton.Journal of South African Earth Sciences, Vol. 32, No. 1, p. A 35.(abs)Northwest TerritoriesCarbonatite, A 154 kimberlite
DS2001-1246
2001
GriffinWin, T.T., Davies, R.M., Griffin, Wathanakul, FrenchDistribution and characteristics of diamonds from MyanmarJournal of Asian Earth Science, Vol. 19, No. 5, Aug. pp. 563-77.GlobalDiamond - morphology, Alluvials
DS2002-1236
2002
GriffinPearson, N.J., Alard, O., Griffin, Jackson, O'ReillyIn situ measurement of Re Os isotopes in mantle sulfides by laser ablation multicollector inductively..Geochimica et Cosmochimica Acta, Vol. 66, 6, pp. 1037-50.Russia, Siberia, Northwest TerritoriesCraton - mass spectrometry, rhenium, osmium, Peridotites
DS2002-1531
2002
GriffinSpetius, Z.V., Belousova, Griffin, O'Reilly, PearsonArchean sulphide inclusions in Paleozoic zircon megacrysts from the Mir kimberlite: implications datingEarth and Planetary Science Letters, Vol.199,1-2,pp.111-26., Vol.199,1-2,pp.111-26.Russia, YakutiaGeochronology - dating of diamonds, Deposit - Mir
DS2002-1532
2002
GriffinSpetius, Z.V., Belousova, Griffin, O'Reilly, PearsonArchean sulphide inclusions in Paleozoic zircon megacrysts from the Mir kimberlite: implications datingEarth and Planetary Science Letters, Vol.199,1-2,pp.111-26., Vol.199,1-2,pp.111-26.Russia, YakutiaGeochronology - dating of diamonds, Deposit - Mir
DS2002-1685
2002
GriffinWang, X., Griffin, O'Reilly, Zhou, Xu, Jackson, PearsonMorphology and geochemistry of zircons from late Mesozoic igneous complexes in coastal SE China:Mineralogical Magazine, Vol.66,2,pp. 235-52., Vol.66,2,pp. 235-52.China, southeastPetrogenesis
DS2002-1686
2002
GriffinWang, X., Griffin, O'Reilly, Zhou, Xu, Jackson, PearsonMorphology and geochemistry of zircons from late Mesozoic igneous complexes in coastal SE China:Mineralogical Magazine, Vol.66,2,pp. 235-52., Vol.66,2,pp. 235-52.China, southeastPetrogenesis
DS2003-1114
2003
GriffinPromprated, P., Taylor, L.A., Floss, C., Malkovets, V.G., Anand, M., GriffinDiamond inclusions from Snap Lake, NWT, Canada8ikc, Www.venuewest.com/8ikc/program.htm, Session 3, POSTER abstractNorthwest TerritoriesDiamonds - inclusions, Deposit - Snap Lake
DS200712-0773
2007
GriffinNasir, S., Al-Khirbashi, S., Al-Sayigh, Alharthy, Mubarek, Rollinson, Lazki, Belouova, Griffin, KaminskyThe first record of allochthonous kimberlite within the Batain Nappes, eastern Oman.Plates, Plumes, and Paradigms, 1p. abstract p. A706.Africa, OmanBatain melange
DS201012-0499
2010
GriffinMints, M.V., Belousova, E.A., Konilov, A.N., Natapov, Shchipansky, Griffin, O'Reilly, Dokukina, KaulinaMesoarchean subduction processes: 2.87 Ga eclogites from the Kola Peninsula, Russia.Geology, Vol. 38, 8, pp. 739-742.Russia, Kola PeninsulaBelomorian
DS201012-0500
2010
GriffinMints, M.V., Konilov, A.N., Dokukina, Kaulina, Belousova, Natapov, Griffin, O'ReillyThe Belomorian eclogite province: unique evidence of Meso-Neoarchean subduction and collisionsDoklady Earth Sciences, Vol. 434, 2, pp. 1311-1316.RussiaEclogite
DS201112-0639
2011
GriffinMalkovets, V.G., Griffin, Pearson, Rezvukhin, O'Reilly, Pokhilenko, Garanin, Spetsius, LitasovLate metasomatic addition of garnet to the SCLM: Os-isotope evidence.Goldschmidt Conference 2011, abstract p.1395.RussiaUdachnaya, Daldyn
DS201112-1156
2011
GriffinZedgenizov, D.A., Ragozin, Shatsky, Kagi, Odake, Griffin, Araujo, YuryevaEvidence for evolution of growth media in superdeep diamonds from Sao-Luis Brazil.Goldschmidt Conference 2011, abstract p.2244.South America, BrazilCl imaging
DS1998-1391
1998
Griffin, B.Spetsius, Z.V., Griffin, B.Secondary phases associated with diamonds in eclogites from Udachnaya pipe:implications for diamond genesis.7th International Kimberlite Conference Abstract, pp. 850-2.Russia, SiberiaXenoliths, Deposit - Udachnaya
DS1998-1393
1998
Griffin, B.Spetsius, Z.V., Taylor, W.R., Griffin, B.Major and trace element partioning between mineral phases in diamondiferous and non-Diamondiferous eclog..7th International Kimberlite Conference Abstract, pp. 856-8.Russia, SiberiaEclogites, Deposit - Udachnaya
DS2001-0061
2001
Griffin, B.Aulbach, S., Griffin, B., O'Reiley, S.How old is the Slave Craton mantle?Gemoc Annual Report 2000, pp. 22-23.MantleGeochronology, Slave Craton
DS2001-0228
2001
Griffin, B.Davies, R., Griffin, B.Superdeep diamonds from the Juin a area, Mato Grosso State, Brasil.Gemoc Annual Report 2000, p. 30.Northwest Territories, BrazilDiamond - morphology, Deposit - Lac de Gras, Mato Grosso areas
DS2001-0258
2001
Griffin, B.Djomani, Y.P., Griffin, B., O'Reilly, S., Pearson, N.The Slave Craton ( Canada) in deep analysisGemoc Annual Report 2000, p. 28-9.Northwest TerritoriesGeophysics - gravity, Lithosphere
DS2001-0412
2001
Griffin, B.Griffin, B., Pearson, N., O'Reilly, S.Sorting out the mantle: in situ measurement of Rhenium- Osmium (Re-Os) isotopes in mantle sulphides by LAM MC ICPNSGemoc Annual Report 2000, p. 32-3.FranceGeochronology - lherzolite
DS2001-0517
2001
Griffin, B.Jackson, S., Davies, R., Griffin, B.Diamond fingerprints - for science and peaceGemoc Annual Report 2000, p. 23.GlobalMicroprobe analysis, Conflict diamonds
DS2002-0678
2002
Griffin, B.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
DS200512-0368
2005
Griffin, B.Griffin, B., Stern, R.Nano SIMS - yellow. Secondary ion mass spectrometry. Diamond source.Rough Diamond Review, No. 8, March pp. 42-44.Technology - SIMS
DS1990-0401
1990
Griffin, B.J.Dessai, A.G., Rock, N.M.S., Griffin, B.J., Gupta, D.Mineralogy and petrology of some xenolith bearing alkaline dykes associated with Deccan magmatism, south of Bombay IndiaEuropean Journal of Mineralogy, Vol. 2, No. 5, pp. 667-686IndiaAlkaline dykes, alkaline rocks, Xenoliths
DS1991-0424
1991
Griffin, B.J.Edwards, D., Rock, N.M.S., Taylor, W.R., Griffin, B.J., Sun, S-S.The Aries Diamondiferous kimberlite pipe, central Kimberley block, westernAustralia: mineralogy, petrology and geochem. of the pipe rock and indicatorsProceedings of Fifth International Kimberlite Conference held Araxa June 1991, Servico Geologico do Brasil (CPRM) Special, pp. 82-84AustraliaMicaceous kimberlite, Group II, Geochemistry
DS1991-0606
1991
Griffin, B.J.Griffin, B.J., Muhling, J.R., Carroll, G.W., Rock, N.M.S.RECALC2- a package for processing mineral analyses produced by electronmicroprobeAmerican Mineralogist, Vol. 76, No. 1-1, Jan-February pp. 295-299GlobalComputer Program, RECALC2- Microprobe
DS1991-0972
1991
Griffin, B.J.Lee, D.C., Boyd, F.R., Griffin, B.J., Reddicliffe, T.Coanjula diamonds, northern Territory, AustraliaProceedings of Fifth International Kimberlite Conference held Araxa June 1991, Servico Geologico do Brasil (CPRM) Special, pp. 231-233AustraliaMicrodiamonds, Microscopy, diamond morphology
DS1991-1200
1991
Griffin, B.J.Muhling, J.R., Griffin, B.J.On recasting garnet analyses into end member molecules -revisitedComputers and Geosciences, Vol. 17, No. 1, January pp. 161-170GlobalComputer, Program -garnet analyses
DS1992-0412
1992
Griffin, B.J.Edwards, D., Rock, N.M.S., Taylor, W.R., Griffin, B.J.Mineralogy and petrology of the Aries Diamondiferous kimberlite pipe, central Kimberley block, western AustraliaJournal of Petrology, Vol. 33, No. 5, October pp. 1157-1191AustraliaKimberlite, Deposit -Aries
DS1992-0641
1992
Griffin, B.J.Gwalani, L.C., Rock, N.M.S., Griffin, B.J.Alkaline rocks and carbonatites of Amba Dongar and adjacent areas, DeccanProvince, Gujarat India: mineralogy, petrology and geochemistryProceedings of the 29th International Geological Congress. Held Japan August 1992, Vol. 2, abstract p. 578IndiaCarbonatite
DS1992-1285
1992
Griffin, B.J.Rock, N.M.S., Griffin, B.J., Edgar, A.D., Paul, D.K., Hergt, J.M.A spectrum of potentially Diamondiferous lamproites and minettes from the Jharia coalfield eastern IndiaJournal of Volcanology and Geothermal Research, Vol. 50, No. 1/2, April 15, pp. 55-84IndiaLamproites, Jharia coalfield
DS1994-1014
1994
Griffin, B.J.Lee, D.C., Boyd, S.R., Griffin, B.J., Griffin, B.W, Reddicliffe, T.Coanjuta diamonds, Northern Territory, AustraliaProceedings of Fifth International Kimberlite Conference, Vol. 2, pp. 51-68.AustraliaDiamond morphology, Deposit -Coanjuta
DS1994-1437
1994
Griffin, B.J.Ramsay, R.R., Edwards, D., Taylor, W.R., Rock, N.M.S., Griffin, B.J.Compositions of garnet, spinel Aries Diamondiferous kimberlite pipe, Kimberley Block, implications for explJournal of Geochem. Exploration, Vol. 51, No. 1, Apr. pp. 59-78.AustraliaGeochemistry, Deposit -Aries
DS1994-1473
1994
Griffin, B.J.Rock, N.M.S., Gwalani, L.G., Griffin, B.J.Alkaline rocks and carbonatites of Amba Dongar and adjacent areas, Deccan alkaline Province, Gujarat India #2Mineralogy and Petrology, Vol. 51, No. 2-4, pp. 113-136.IndiaAlkaline rocks, Carbonatite
DS1995-0229
1995
Griffin, B.J.Bulanova, G.P., Griffin, B.J.The origin of complex agate textures in octahedral diamonds fromkimberlites.Proceedings of the Sixth International Kimberlite Conference Extended Abstracts, p. 74-76.Russia, YakutiaDiamond morphology, Deposit -Mir, Aikal
DS1995-0681
1995
Griffin, B.J.Griffin, B.J., Bulanova, G.P., Taylor, W.R.Chlorine and FTIR mapping of nitrogen content and hydrogen distribution in a diamond from the Mir pipe -growth.Proceedings of the Sixth International Kimberlite Conference Extended, p. 191-93.GlobalDiamond morphology, Deposit -Mir
DS1995-0682
1995
Griffin, B.J.Griffin, B.J., Rissanen, J., Pooley, G.D., Lee, DearnA new Diamondiferous eclogite bearing kimberlitic occurrence from FinlandProceedings of the Sixth International Kimberlite Conference Extended Abstracts, p. 198-200.FinlandEclogite
DS1995-0958
1995
Griffin, B.J.Kinny, P.D., Griffin, B.J., Brakhfogel, F.E.SHRIMP uranium-lead (U-Pb) (U-Pb) ages of perovskite and zircon from Yajutian kimberlitesProceedings of the Sixth International Kimberlite Conference Abstracts, pp. 275-276.Russia, YakutiaGeochronology -SHRIMP, Deposit -Udachnaya, Polayrnaya, Dalnaya
DS1995-1331
1995
Griffin, B.J.Neeharika, Jha, Smith, S.B., Griffin, B.J., ChatterjeeDiamonds from the kimberlites of southeastern Raipur kimberlite field, Raipur district, Madhya Pradesh.Proceedings of the Sixth International Kimberlite Conference Abstracts, pp. 266-268.India, Madhya PradeshDiamond morphology, Deposit -Payalikand, Bahradih
DS1995-1926
1995
Griffin, B.J.Trautman, R.L., Griffin, B.J., Taylor, W.R.A comparison of the microdiamonds from kimberlite and lamproite of Siberia and Australia.Proceedings of the Sixth International Kimberlite Conference Abstracts, pp. 631-633.Australia, Russia, SiberiaMicrodiamonds, Diamond morphology
DS1996-0567
1996
Griffin, B.J.Griffin, B.J.Recent diamond research at University of Western Australia.FTIR, SHRIMPII, ESEM, FESEN, scanning electron microscope (SEM),CL, TEM.Australia Nat. University of Diamond Workshop July 29, 30., 1p.AustraliaBrief overview of activities
DS1997-1168
1997
Griffin, B.J.Trautman, R.L., Griffin, B.J., Taylor, W.R., Spetsius etA comparison of the microdiamonds from kimberlite and lamproite of Yakutia and Australia.Russian Geology and Geophysics, Vol. 38, No. 2, pp. 341-355.Australia, Russia, YakutiaMicrodiamonds, Morphology, physical properties
DS1998-0750
1998
Griffin, B.J.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
DS1998-1481
1998
Griffin, B.J.Trautman, R.L., Griffin, B.J., Bulanova, G.P.Growth features and nitrogen aggregation properties of microdiamonds derived from kimberlitic diatremes.7th International Kimberlite Conference Abstract, pp. 926-8.Russia, Australia, Brazil, Finland, South AfricaCathodluminescence data, Micro diamonds
DS2002-0221
2002
Griffin, B.J.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
DS2003-0182
2003
Griffin, B.J.Bulanova, G.P., Muchemwa, E., Pearson, D.G., Griffin, B.J., Kelly, S., KlemmeSyngenetic inclusions of yeminite in diamond from Sese kimberlite ( Zimbabwe) -8ikc, Www.venuewest.com/8ikc/program.htm, Session 3, POSTER abstractZimbabweDiamonds - inclusions, Deposit - Sese
DS2003-0785
2003
Griffin, B.J.Lee, D.C., Maddren, J., Griffin, B.J.The importance of chromite morphology in diamond exploration8 Ikc Www.venuewest.com/8ikc/program.htm, Session 8, POSTER abstractAustraliaBlank
DS200412-0239
2004
Griffin, B.J.Bulanova, G.P., Muchemwa, E., Pearson, D.G., Griffin, B.J., Kelley, S.P., Klemme, S., Smith, C.B.Syngenetic inclusions of yimengite in diamond from Sese kimberlite - evidence for metasomatic conditions of growth.Lithos, Vol. 77, 1-4, Sept. pp. 181-192.Africa, ZimbabweMagnetoplumbite, grochronology argon, mantle, metasomat
DS200412-1102
2003
Griffin, B.J.Lee, D.C., Maddren, J., Griffin, B.J.The importance of chromite morphology in diamond exploration.8 IKC Program, Session 8, POSTER abstractAustraliaDiamond exploration
DS200712-0275
2007
Griffin, B.J.Downes, P.J., Griffin, B.J., Griffin, W.L.Mineral chemistry and zircon geochronology of xenocrysts and altered mantle and crustal xenoliths from the Aries micaceous kimberlite: constraints age..Lithos, Vol. 93, 1-2, pp. 175-198.AustraliaKimberly Craton - central composition age
DS200912-0702
2009
Griffin, B.J.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
DS201212-0096
2012
Griffin, B.J.Bulanova, G.P., Marks, A., Smith, C.B., Kohn, S.C., Walter, M.J., Gaillou, E., Shiry, S.B., Trautman, R., Griffin, B.J.Diamonds from Sese and Murowa kimberlites ( Zimbabwe) - evidence of extreme peridotitic lithosphere depletion and Ti-REE metasomatism.10th. International Kimberlite Conference Held Bangalore India Feb. 6-11, Poster abstractAfrica, ZimbabweDeposit - Sese, Murowa
DS201412-0209
2014
Griffin, B.J.Downes, P.J., Demeny, A., Czuppon, G., Jacques, A.L., Verrall, M., Sweetapple, M., Adams, D., McNaughton, N.J., Gwalani, L.G., Griffin, B.J.Stable H-C-O isotope and trace element geochemistry of the Cummins Range carbonatite complex, Kimberley region Western Australia: implications for hydrothermal REE mineralization, carbonatite evolution and mantle source regions.Mineralium Deposita, in press available 28p.AustraliaCarbonatite
DS201412-0210
2014
Griffin, B.J.Downes, P.J., Demeny, A., Czuppon, G., Jaques, A.L., Verrall, M., Sweetapple, M., Adams, D., McNaughton, N.J., Gwalani, L.G., Griffin, B.J.Stable H-C-O isotope and trace element geochemistry of the Cummins Range carbonatite complex, Kimberley region western Australia: implications for hydrothermal REE mineralization, carbonatite evolution and mantle source regions.Mineralium Deposita, Vol. 49, p. 905-932.AustraliaCarbonatite
DS1994-1014
1994
Griffin, B.WLee, D.C., Boyd, S.R., Griffin, B.J., Griffin, B.W, Reddicliffe, T.Coanjuta diamonds, Northern Territory, AustraliaProceedings of Fifth International Kimberlite Conference, Vol. 2, pp. 51-68.AustraliaDiamond morphology, Deposit -Coanjuta
DS1996-1384
1996
Griffin, D.Stull, A.T., Griffin, D.Life on the internet -geosciences - a student's guidePrentice Hall, 50p. $ 10.00 United StatesGlobalBook - table of contents, Websites
DS1984-0317
1984
Griffin, T.Griffin, T., Shaw, L.Petrology of the San Isabel Batholith, Southern Wet Mountains Colorado.Geological Society of America (GSA), Vol. 16, No. 4, P. 223 (abstract.).United States, Colorado, Rocky MountainsRelated Rocks
DS1985-0133
1985
Griffin, T.Cullers, R.L., Ramakrishnan, S., Berendsen, P., Griffin, T.Geochemistry and Petrogenesis of Lamproites, Late Cretaceous Age, Woodson County, Kansas, United States (us)Geochimica et Cosmochimica Acta ., Vol. 49, PP. 1383-1402.United States, Central States, KansasLamproite Terminology, Analyses, Silver City Dome
DS1990-1486
1990
Griffin, T.J.Tyler, I.M., Griffin, T.J.Structural development of the King Leopold Orogen, Kimberley region, Western AustraliaJournal of Structural Geology, Vol. 12, No. 5/6, pp. 703-714AustraliaStructure, Kimberley region
DS1999-0752
1999
Griffin, T.J.Tyler, I.M., Page, R.W., Griffin, T.J.Depositional age and provenance of the Marboo Formation from SHRIMPgeochronology: Paleoproterozoic evolutionPrecambrian Research, Vol. 95, No. 3-4, May 15, pp. 225-43.Australia, Western AustraliaGeochronology, Kimberley area - not specific to diamonds
DS2000-0362
2000
Griffin, T.J.Griffin, T.J., Page, R.W., Sheppard, TylerTectonic implications of Paleoproterozoic post collisional high Potassium felsic igneous rocks Kimberley....Precambrian Research, Vol. 100, No. 1-3, pp. 1-23.AustraliaTectonics
DS2003-1261
2003
Griffin, V.L.Shchukin, V.S., Sablukov, S.M., Sablukova, L.I., Belousova, E.A., Griffin, V.L.Late Vendian aerial alkaline volcanism in the Winter Coast kimberlite area, Arkangelsk8ikc, Www.venuewest.com/8ikc/program.htm, Session 1 POSTER abstractRussia, ArkangelskKimberlite geology and economics, Deposit - Winter Coast
DS2003-0869
2003
Griffin, W.Malkovets, V.G., Taylor, L.A., Griffin, W., O'Reilly, S., Pearson, N., PokhilenkoCratonic considitons beneath Arkhangelsk, Russia: garnet peridotites form the Grib8ikc, Www.venuewest.com/8ikc/program.htm, Session 4, POSTER abstractRussia, Kola PeninsulaMantle geochemistry, Deposit - Grib
DS200612-0499
2006
Griffin, W.Griffin, W., O'Reilly, S.TerraneChron - new tool for regional exploration.. based on zircon analyses.GEMOC Annual Report, 2005, p. 24.AustraliaTechnology - TerraneChron