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SDLRC - Scientific Articles all years by Author - He-Hn


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.
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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 - He-Hn
Posted/
Published
AuthorTitleSourceRegionKeywords
DS2003-0566
2003
He, B.He, B., Xu, Y.G., Chung, S.L., Xiao, L., Wang, Y.Sedimentary evidence for a rapid kilometer scale crustal doming prior to eruption of theEarth and Planetary Science Letters, Vol. 213, 3-4, pp. 391-405.GlobalBasalts - not specific to diamonds, tectonics
DS200412-0808
2003
He, B.He, B., Xu, Y.G., Chung, S.L., Xiao, L., Wang, Y.Sedimentary evidence for a rapid kilometer scale crustal doming prior to eruption of the Emeishan flood basalts.Earth and Planetary Science Letters, Vol. 213, 3-4, pp. 391-405.TechnologyBasalts - not specific to diamonds Tectonics
DS200512-1204
2004
He, B.Xiao, L., Xu, Y.G., Mei, H.J., Zheng, Y.F., He, B., Pirajno, F.Distinct mantle sources of low Ti and high Ti basalts from the western Emeishan large igneous province, SW China: implications for plume?? lithosphere interactionEarth and Planetary Science Letters, Vol. 228, 3-4, pp. 525-546.ChinaMantle mineralogy, titanium
DS200712-1133
2007
He, B.Wang, Q., Wyman, D.A., Xu, J., Jian, P., Zhao, Z., Li, C., Xu, W., Ma, J., He, B.Early Cretaceous adakitic granites in the northern Dabie Complex, central China: implications for partial melting and delamination of thickened lower crust.Geochimica et Cosmochimica Acta, Vol. 71, 10, May 15, pp. 2609-2636.ChinaUHP - Dabie Shon
DS201012-0440
2010
He, B.Li, J.,Xu, J-F., Suzuki, K., He, B., Xu, Y-G., Ren, Z-Y.Os, Nd and Sr isotope and trace element geochemistry of the Muli picrites: insights into the mantle source of the Emeishan large igneous province.Lithos, in press available, 15p.ChinaGeochronology
DS201312-0536
2014
He, B.Li, J., Wang,-C., Ren, Z-Y., Xu, J-F., He, B., Xu, Y-G.Chemical heterogeneity of the Emeishan mantle plume: evidence from highly siderophile element abundances in picrites.Journal of Asian Earth Studies, Vol. 79, A, pp. 191-205.ChinaPicrite
DS201703-0406
2017
He, D.He, D., Liu, Y., Gao, C., Chen, C., Hu, Z., Gao, S.SiC dominated ultra-reduced mineral assemblage in carbonatitic xenoliths from the Dalihu basalt, Inner Mongolia, China.American Mineralogist, Vol. 102, pp. 312-320.China, MongoliaCarbonatite

Abstract: SiC and associated ultra-reduced minerals were reported in various geological settings, however, their genesis and preservation mechanism are poorly understood. Here, we reported a SiC-dominated ultra-reduced mineral assemblage, including SiC, TiC, native metals (Si, Fe, and Ni) and iron silicide, from carbonatitic xenoliths in Dalihu, Inner Mongolia. All minerals were identified in situ in polished/thin sections. SiC is 20-50 µm in size, blue to colorless in color, and usually identified in the micro-cavities within the carbonatitic xenolith. Four types of SiC polytypes were identified, which are dominated by ß-SiC (3C polytype) and 4H polytype followed by 15R and 6H. These SiC are featured by 13C-depleted isotopic compositions (d13C = -13.2 to -22.8‰, average = -17.7‰) with obvious spatial variation. We provided a numerical modeling method to prove that the C isotopic composition of the Dalihu SiC can be well-yielded by degassing. Our modeling results showed that degassing reaction between graphite and silicate can readily produce the low d13C value of SiC, and the spatial variations in C isotopic composition could have been formed in the progressive growth process of SiC. The detailed in situ occurring information is beneficial for our understanding of the preservation mechanism of the Dalihu ultra-reduced phase. The predominant occurrence of SiC in micro-cavities implies that exsolution and filling of CO2 and/or CO in the micro-cavities during the diapir rising process of carbonatitic melt could have buffered the reducing environment and separated SiC from the surrounding oxidizing phases. The fast cooling of host rock, which would leave insufficient time for the complete elimination of SiC, could have also contributed to the preservation of SiC.
DS201809-2063
2018
He, D.Liu, Y-S., Foley, S.F., Chien, C.F., He, D., Zong, K.Q.Mantle recycling of sedimentary carbonate along the northern margin of the North Chin a craton.Goldschmidt Conference, 1p. AbstractChinacarbonatite

Abstract: Sedimentary carbonate rocks, which exist extensively in the oceanic realm, are subducted to differing degrees during the closure of oceanic basins. However, very few observational data exist to provide details on the mechanisms of transport of carbonate materials from the surface to mantle depths and back to the Earth’s surface. Here we presented a series of diamond-bearing carbonatite xenoliths, carbonatite intrusions and carbonatite veins along the northern margin of the North China Craton (NCC). These carbonatites show geochemical features of recycled limestone (similar trace element patterns and high 87Sr/86Sr ratios of 0.705-0.709), indicating that they had a sedimentary limestone precursor. However, the presence of diamond, reduced minerals (e.g., moissanite), mantle-derived silicate minerals (eg., Cpx and Opx), and high Ni content and 143Nd/144Nd ratio indicate their staying for a time in the mantle. Combining with the zircon age spectrums of the carbonatite xenoliths and intrusions and the extensive high-87Sr/86Sr (up to 0.708) carbonatite metasomatism in the lithospheric mantle along the northern margin of NCC, we suggest that the limestone precursor could have been derived from the Paleo-Asian Ocean, and these carbonatites mark the subduction of a carbonate platform of the Paleo-Asian Oceanic slab to mantle depths beneath the NCC. Extensive mantle recycling of sedimentary carbonate could have contributed to the modification of the lithospheric mantle along the northern margin of the North China Craton.
DS1986-0350
1986
He, G.He, G., Shanguan, Z., Zhao, Y.Carbonatites and their patterns of rare earth elements (REE) distribution in Erdaobian and Boshanareas, ChinaProceedings of the Fourth International Kimberlite Conference, Held Perth, Australia, No. 16, pp. 39-41ChinaCarbonatite, rare earth elements (REE).
DS1986-0351
1986
He, G.He, G., Zhao, Y.Geochemistry of porphyritic kimberlites in Mengyin County,Shandong Province and in Fuxian County, Liaoning Province,ChinaProceedings of the Fourth International Kimberlite Conference, Held Perth, Australia, No. 16, pp. 36-38ChinaGeochemistry
DS201312-1010
2013
He, H.Zhang, D., Zhang, Z., Santosh, M., Cheng, Z., He, H., Kang, J.Perovskite and baddeleyite from kimberlitic intrusions in the Tarim large igneous province signal the onset of an end Carboniferous mantle plume.Earth and Planetary Science Letters, Vol. 361, pp. 238-248.ChinaDeposit - Wajiltag
DS201412-0966
2014
He, H.Wang, Y., He, H., Ivanov, A.V., Zhu, R.,Lo, C.Age and origin of charoitite, Malyy Murun massif, Siberia Russia.International Geology Review, Vol. 56, 8, pp. 1007-1019.RussiaCharoite
DS202004-0502
2020
He, H.Cawood, P.A., Wang, W., Zhao, T., Xu, Y., Mulder, J.A., Pisarevsky, S.A., Zhang, L., Gan, C., He, H., Liu, H., Qi, L., Wang, Y., Yao, J., Zhao, G., Zhou, M-F., Zi, J-W.Deconstructing south China and consequences for reconstructing Nuna and Rodinia.Earth-Science Reviews, in press available, 70p. PdfChinatectonics

Abstract: Contrasting models for internal and external locations of South China within the Nuna and Rodinia supercontinents can be resolved when the current lithotectonic associations of Mesoproterozoic and older rocks units that constitute the craton are redefined into four lithotectonic domains: Kongling, Kunming-Hainan, Wuyi, and Coastal. The Kongling and Kunming-Hainan domains are characterized by isolated Archean to early Paleoproterozoic rock units and events and crop out in northern and southern South China, respectively. The Kunming-Hainan Domain is preserved in three spatially separated regions at Kunming (southwestern South China), along the Ailaoshan shear zone, and within Hainan Island. Both domains were affected by late Paleoproterozoic tectonothermal events, indicating their likely juxtaposition by this time to form the proto-Yangtze Block. Late Paleoproterozoic and Mesoproterozoic sedimentary and igneous rock units developed on the proto-Yangtze Block, especially in its southern portions, and help link the rock units that formed along the shear zone at Ailaoshan and on Hainan Island into a single, spatially unified unit prior to Paleozoic to Cenozoic structural disaggregation and translation. The Wuyi Domain consists of late Paleoproterozoic rock units within a NE-SW trending, fault-bounded block in eastern South China. The Coastal Domain lies east of the Wuyi domain and is inferred to constitute a structurally separate block. Basement to the domain is not exposed, but zircon Hf model ages from Mesozoic granites suggest Mesoproterozoic basement at depth. The Archean to Paleoproterozoic tectonothermal record of the Kongling and Kunming-Hainan domains corresponds closely with that of NW Laurentia, suggesting all were linked, probably in association with assembly and subsequent partial fragmentation of the Nuna supercontinent. Furthermore, the age and character of Mesoproterozoic magmatism and detrital zircon signature of sedimentary rocks in the proto-Yangtze Block matches well with western Laurentia and eastern Australia-Antarctica. In particular, the detrital zircon signature of late Paleoproterozoic to early Mesoproterozoic sedimentary units in the block (e.g. Dongchuan Group) share a similar age spectrum with the Wernecke Supergroup of northwest Laurentia. This, together with similarities in the type and age of Fe-Cu mineralization in the domain with that in eastern Australia-Antarctica, especially northeast Australia, suggests a location adjacent to northwest Laurentia, southern Siberia, and northeast Australia within the Nuna supercontinent. The timing and character of late Paleoproterozoic magmatic activity in the Wuyi domain along with age of detrital zircons in associated sedimentary rocks matches the record of northern India. During rifting between Australia-Antarctica and Laurentia in the late Mesoproterozoic, the proto-Yangtze Block remained linked to northeast Australia. During accretionary orogenesis in the early Neoproterozoic, the proto-Yangtze Block assembled with the Wuyi Domain along the northern margin of India. The Coastal domain likely accreted at this time forming the South China Craton. Displacement of the Hainan and Ailaoshan assemblages from southwest of the Kunming assemblage likely occurred in the Cenozoic with the activation of the Ailaoshan-Red River fault system but could have begun in the early to mid-Paleozoic based on evidence for tectonothermal events in the Hainan assemblage.
DS200812-1235
2007
He, H-Y.Wang, F., Lu, X-X., Lo, C-H., Wu, F-Y., He, H-Y., Yang, L-K., Zhu, R-X.Post collisional, potassic monzonite-minette complex Shahewan in the Qinling Mountains: 40Ar 39Ar thermochronology, petrogenesis, implications - dynamicJournal of Asian Earth Sciences, Vol. 31, 2, October pp. 153-166.ChinaMinette
DS200412-0393
2004
He, J.Currie, C.A., Wang, K., Hyndman, R.D., He, J.The thermal effects of steady state slab driven mantle flow above a subducting plate: the Cascadia subduction zone and backarc.Earth and Planetary Science Letters, Vol. 223, 1-2, pp. 35-48.United States, WashingtonSubduction
DS200712-0161
2007
He, J.Chai, Y., Li, A., Shi, Y., He, J., Zhang, K.Kimberlites identification by classification methods.Lecture Notes in Computer Science, No. 4488, pp. 409-414.TechnologyClassification
DS200712-0162
2007
He, J.Chai, Y., Li, A., Shi, Y., He, J., Zhang, K.Kimberlites identification by classification methods.Lecture Notes in Computer Science, No. 4488, pp. 409-414.TechnologyClassification
DS200812-1223
2008
He, J.Wada, I., Wang, K., He, J., Hyndman, R.D.Weakening of the subduction surface abd its effects on surface heat flow, slab dehydration, and mantle wedge serpentinization.Journal of Geophysical Research, Vol. 113, B4, B04402MantleSubduction
DS200812-1224
2008
He, J.Wada, I., Wang, K., He, J., Hyndman, R.D.Weakening of the subduction interface and its effects on surface heat flow, slab dehydration, and mantle wedge serpentinization.Journal of Geophysical Research, Vol. 113, B04402.MantleSubduction, geothermometry
DS201412-0383
2014
He, J.Huang, Q., Yu, D., Xu, B., Hu, W., Ma, Y., Wang, Y., Zhao, Z., Wen, B., He, J., Liu, Z., Tian, Y.Nanotwinned diamond with unprecedented hardness and stability.Nature, Vol. 510, June 12, pp. 250-253.TechnologyDiamond synthetic
DS201012-0789
2010
He, K.Tkalcic, H., Cormier, V.F., Kennett, B.L.N., He, K.Steep reflections from the Earth's core reveal small scale heterogeneity in the upper mantle.Physics of the Earth and Planetary Interiors, Vol. 178, pp. 80-91.MantleGeoiphysics - seismics
DS2000-0423
2000
He, L.Hu, S., He, L., Wang, J.Heat flow in the continental area of China: a new dat a setEarth and Planetary Science Letters, Vol. 179, No. 2, June 30, pp. 407-ChinaGeothermometry, Heat flow
DS201502-0061
2015
He, L.He, L.Thermal regime of the North Chin a craton: implications for craton destruction.Earth Science Reviews, Vol. 140, pp. 14-26.ChinaGeothermometry
DS201809-2034
2018
He, L.He, L., Zhang, L.Thermal evolution of cratons in China. ReviewJournal of Asian Earth Sciences, Vol. 164, pp. 237-247.Chinageothermometry
DS2003-1511
2003
He, M.Xu, S., Liu, Y., Chen, G., Compagnoni, R., Rolfo, F., He, M., Liu, H.New finding of microdiamonds in eclogites from Dabie Sulu region in central easternChinese Science Bulletin, Science Press, Vol. 48, 10, May, pp. 988-994.ChinaUHP, Deposit - Dabie Shan area
DS200412-2159
2003
He, M.Xu, S., Liu, Y., Chen, G., Compagnoni, R., Rolfo, F., He, M., Liu, H.New finding of microdiamonds in eclogites from Dabie Sulu region in central eastern China.Chinese Science Bulletin, Vol. 48, 10, May, pp. 988-994.ChinaUHP Deposit - Dabie Shan area
DS202012-2240
2020
He, M.Pine, D., He, M.Researchers discover novel method for creating colloidal diamonds.Nature, www.sciencetimes.com/ articles/27434/ 20200924Globalnanodiamonds

Abstract: Colloidal diamonds - stable, self-assembled material with promising applications in light-related technologies - can now be fabricated, decades after its concept was first developed in the 90s.
DS201608-1450
2016
He, W-Y.Wang, R., Collins, W.J., Weinberg, R.F., Li, J-X., Li, Q-Y., He, W-Y., Richards, J.P., Hou, Z., Zhou, Li-M., Stern, R.A.Xenoliths in ultrapotassic volcanic rocks in the Lhasa block: direct evidence for crust mantle mixing and metamorphism in the deep crust.Contributions to Mineralogy and Petrology, in press available 19p.Asia, TibetMelting

Abstract: Felsic granulite xenoliths entrained in Miocene (~13 Ma) isotopically evolved, mantle-derived ultrapotassic volcanic (UPV) dykes in southern Tibet are refractory meta-granitoids with garnet and rutile in a near-anhydrous quartzo-feldspathic assemblage. High F-Ti (~4 wt.% TiO2 and ~3 wt.% F) phlogopite occurs as small inclusions in garnet, except for one sample where it occurs as flakes in a quartz-plagioclase-rich rock. High Si (~3.45) phengite is found as flakes in another xenolith sample. The refractory mineralogy suggests that the xenoliths underwent high-T and high-P metamorphism (800-850 °C, >15 kbar). Zircons show four main age groupings: 1.0-0.5 Ga, 50-45, 35-20, and 16-13 Ma. The oldest group is similar to common inherited zircons in the Gangdese belt, whereas the 50-45 Ma zircons match the crystallization age and juvenile character (eHfi +0.5 to +6.5) of Eocene Gangdese arc magmas. Together these two age groups indicate that a component of the xenolith was sourced from Gangdese arc rocks. The 35-20 Ma Miocene ages are derived from zircons with similar Hf-O isotopic composition as the Eocene Gangdese magmatic zircons. They also have similar steep REE curves, suggesting they grew in the absence of garnet. These zircons mark a period of early Miocene remelting of the Eocene Gangdese arc. By contrast, the youngest zircons (13.0 ± 4.9 Ma, MSWD = 1.3) are not zoned, have much lower HREE contents than the previous group, and flat HREE patterns. They also have distinctive high Th/U ratios, high zircon d18O (+8.73-8.97 ‰) values, and extremely low eHfi (-12.7 to -9.4) values. Such evolved Hf-O isotopic compositions are similar to values of zircons from the UPV lavas that host the xenolith, and the flat REE pattern suggests that the 13 Ma zircons formed in equilibrium with garnet. Garnets from a strongly peraluminous meta-tonalite xenolith are weakly zoned or unzoned and fall into four groups, three of which are almandine-pyrope solid solutions and have low d18O (+6 to 7.5 ‰), intermediate (d18O +8.5 to 9.0 ‰), and high d18O (+11.0 to 12.0 ‰). The fourth is almost pure andradite with d18O 10-12 ‰. Both the low and intermediate d18O groups show significant variation in Fe content, whereas the two high d18O groups are compositionally homogeneous. We interpret these features to indicate that the low and intermediate d18O group garnets grew in separate fractionating magmas that were brought together through magma mixing, whereas the high d18O groups formed under high-grade metamorphic conditions accompanied by metasomatic exchange. The garnets record complex, open-system magmatic and metamorphic processes in a single rock. Based on these features, we consider that ultrapotassic magmas interacted with juvenile 35-20 Ma crust after they intruded in the deep crust (>50 km) at ~13 Ma to form hybridized Miocene granitoid magmas, leaving a refractory residue. The ~13 Ma zircons retain the original, evolved isotopic character of the ultrapotassic magmas, and the garnets record successive stages of the melting and mixing process, along with subsequent high-grade metamorphism followed by low-temperature alteration and brecciation during entrainment and ascent in a late UPV dyke. This is an excellent example of in situ crust-mantle hybridization in the deep Tibetan crust.
DS2003-0604
2003
He, X.C.Hu, X.J., Dai, Y.B., Li, R.B., Shen, H.S., He, X.C.A molecular dynamics study of interstitial boron in diamondPhysica B, Vol. 327, 1, pp. 39-42.GlobalDiamond morphology
DS201508-0358
2015
He, X-F.He, X-F., Santosh, M., Zhang, Z-M., Tsunogae, T., Chetty, T.R.K., Ram Moham, M., AnbazhaganShonkinites from Salem, southern India: implications for Cryogenian alkaline magmatism in rift related setting.Journal of Asian Earth Sciences, in press availableIndiaShonkinites
DS201712-2727
2018
He, X-F.Santosh, M., Hari, K.R., He, X-F., Han, Y-S., Manu Prasanth, M.P.Oldest lamproites from Peninsular India track the onset of Paleoproterozoic plume induced rifting and the birth of Large Igneous Province.Gondwana Research, Vol. 55, pp. 1-20.Indialamproites - Nuapada

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

Abstract: Potassic and ultrapotassic magmatism from deep lithospheric sources in intra-cratonic settings can be the signal of subsequent voluminous mafic magmatism and the formation of Large Igneous Provinces (LIPs) triggered by mantle plumes. Here we report for the first time, precise zircon U-Pb age data from a suite of lamproites in the Bastar Craton of central India that mark the onset of Paleoproterozoic rifting and culminating in the formation of extensive mafic dyke swarms as the bar codes of one of the major LIP events during the Precambrian evolution of the Indian shield. The lamproites from the Nuapada field occur as dismembered dykes and are composed of phenocrysts and microphenocrysts of altered olivine together with microphenocrysts of phlogopite and magnetite within a groundmass of chlorite and calcite with accessory rutile, apatite and zircon. The rocks compositionally correspond to olivine phlogopite lamproite and phlogopite lamproite. Geochemical features of the lamproites correlate with their counterparts in Peninsular India and other similar suites elsewhere in the world related to rift settings, and also indicate OIB-like magma source. The associated syenite shows subduction-related features, possibly generated in a post-collisional setting. Magmatic zircon grains with high Th/U ratios in the syenite from the Nuapada lamproite form a coherent group with an upper intercept age of 2473 ± 8 Ma representing the timing of emplacement of the magma. Zircon grains in three lamproite samples yield four distinct age groups at ca. 2.4 Ga, 2.2 Ga, 2.0 Ga and 0.8 Ga. The 2.4 Ga group corresponds to xenocrysts entrained from the syenite whereas the 2.2 Ga group is considered to represent the timing of emplacement of the lamproites. The ca. 2.0 Ga zircon grains correlate with the major thermal imprint associated with mafic magmatism and dyke emplacement in southern Bastar and the adjacent Dharwar Cratons. A few young zircon grains in the syenite and lamproites show a range of early to middle Neoproterozoic ages from 879 to 651 Ma corresponding to younger thermal event(s) as also represented by granitic veins cutting across these rocks and extensive silicification. Zircon Lu-Hf isotope data suggest magma derivation from a refertilized Paleo-Mesoarchean sub-continental lithospheric mantle, or OIB-type sources. The differences in Hf-isotope composition among the zircon grains from different age groups indicate that the mantle sources of the lamproite are heterogeneous at the regional scale. A combination of the features from geochemical and zircon Hf isotope data is consistent with asthenosphere-lithosphere interaction during the lamproite magma evolution. The timing of lamproite emplacement in central India correlates with the global 2.2 Ga record of LIPs. We link the origin of the related mantle plume to the recycling of subducted slabs associated with the prolonged subduction-accretion history prior to the Neoarchean cratonization, as well as the thermal blanket effect of the Earth's oldest supercontinent. Pulsating plumes and continued rifting generated voluminous dyke swarms across the Bastar and Dharwar Cratons, forming part of a major global rifting and LIP event.
DS2003-0004
2003
He, Y.Ai, Y., Zheng, T., Xu, W., He, Y., Dong, D.A complex 660 km discontinuity beneath northeast ChinaEarth and Planetary Science Letters, Vol. 212, 1-2, pp. 63-71.ChinaTectonics
DS200412-0009
2003
He, Y.Ai, Y., Zheng, T., Xu, W., He, Y., Dong, D.A complex 660 km discontinuity beneath northeast China.Earth and Planetary Science Letters, Vol. 212, 1-2, pp. 63-71.ChinaGeophysics - seismics Tectonics
DS200612-1509
2006
He, Y.Wang, Yi., Wen, L., WEidner, D., He, Y.SH velocity and compositional models near the 660 km discontinuity beneath South America and northeast Asia.Journal of Geophysical Research, Vol. 111, B7 B07305.South America, AsiaGeophysics - seismics
DS200812-0488
2008
He, Y.Huang, F., li, S., Dong, F., He, Y., Chen, F.High mag adakitic rocks in the Dabie orogen, central China: implications for foundering mechanisms of lower continental crust.Chemical Geology, Vol. 255, 1-2, Sept. 30, pp. 1-13.ChinaUHP
DS200812-1248
2008
He, Y.Wen, L., He, Y.Pacific and African anomalies. Earth's early differentiation, mantle dynamics and geochemistry.Goldschmidt Conference 2008, Abstract p.A1015.MantleStructural features
DS2003-0208
2003
He, Z.Cao, J., He, Z., Zhu, J., Fullagar, P.K.Conductivity tomography at two frequenciesGeophysics, Vol. 68, 2, pp. 516-22.MantleGeophysics - seismics
DS200412-0269
2003
He, Z.Cao, J., He, Z., Zhu, J., Fullagar, P.K.Conductivity tomography at two frequencies.Geophysics, Vol. 68, 2, pp. 516-22.MantleGeophysics - seismics
DS1980-0167
1980
He Guan ZhiHe Guan ZhiOn the Genetic Mechanism of Kimberlite and DiamondGeological Review., Vol. 26, No. 5, PP. 384-392.ChinaKimberlite, Genesis
DS1984-0350
1984
He Guan ZhiHe Guan ZhiKimberlites in Chin a and Their Major Components: a Discussion on the Physico Chemical Properties of the Upper Mantle.Proceedings of Third International Kimberlite Conference, KORNPROBST, J. EDITOR: DEVELOPMENTS IN PE, Vol. 1, PP. 181-194.China, Shandong, Liaoning, GiuzhouKimberlite Mineralogy, Petrology, Age Dating, Structure, Textur
DS1960-0556
1965
He Guan-ZheHe Guan-ZheThe Microstructure of the Surface of Several Types of DiamonScientia Geol. Sinica., Vol. 1, No. 1, PP. 69-76.ChinaMicrodiamonds, Crystallography
DS1987-0284
1987
He Guan-ZhiHe Guan-ZhiMantle xenoliths from kimberlites in Chinain: Nixon, P.H. ed. Mantle xenoliths, J. Wiley, pp. 181-186Chinap. 184 Analyses pyropes and philogopite from kimberlit
DS1987-0285
1987
He Xiong, D.A.He Xiong, D.A., Mahoney, J.J.Preliminary experimental study of the relationship between kimberlite and metasomatism of duniteEos, abstractGlobalMantle genesis
DS1992-0948
1992
He YongnianLin Chuanyong, Shi Lanbin, He Yongnian, Chen XiaodePhysical state and rheology of the upper mantle beneath eastern China:evidence from mantle xenolithsInternational Symposium Cenozoic Volcanic Rocks Deep seated xenoliths China and its, Abstracts pp. 71-74ChinaMantle, Xenoliths
DS200412-0477
2004
HeaDownes, H., Macdonald, R., Upton, B.G.J., Cox, K.G., Bodinier, J-L., Mason, P.R.D., James, D., Hill, P.G., HeaUltramafic xenoliths from the Bearpaw Mountains, Montana: USA: evidence for multiple metasomatic events in the lithospheric mantJournal of Petrology, Vol. 45, 8, pp. 1631-1662.United States, MontanaMetasomatism
DS1995-0507
1995
Head, J.W.Ernst, R.E., Head, J.W., Parfitt, Grosfils, WilsonGiant radiating dyke swarms on Earth and VenusEarth Science Reviews, Vol. 39, No. 1-2, Sept. pp. 1-58.GlobalDyke swarms, Review
DS1995-0510
1995
Head, J.W.Ernst, R.E., Head, J.W., Parfitt, E., Grosfils, E., WilsonGiant radiating dyke swarms on Earth and VenusEarth Science Reviews, Vol. 39 No. 1-2, Sept. pp. 1-58GlobalDike swarms, Review
DS2003-0567
2003
Head, J.W.Head, J.W., Wilson, L.Diatremes and kimberlites 1.: definition, geological characteristics and associations8 Ikc Www.venuewest.com/8ikc/program.htm, Session 1, AbstractGlobalGeology, economics, Magmatism - model stages
DS2003-1486
2003
Head, J.W.Wilson, L., Head, J.W.Diatremes and kimberlites 2.: an integrated model of the ascent and eruption of8 Ikc Www.venuewest.com/8ikc/program.htm, Session 1, AbstractGlobalGeology, economics, Magmatism - carbon dioxide CO2
DS200412-0809
2003
Head, J.W.Head, J.W., Wilson, L.Diatremes and kimberlites 1.: definition, geological characteristics and associations.8 IKC Program, Session 1, AbstractTechnologyGeology, economics Magmatism - model stages
DS200412-2130
2003
Head, J.W.Wilson, L., Head, J.W.Diatremes and kimberlites 2.: an integrated model of the ascent and eruption of kimberlitic magmas and the production of crater,8 IKC Program, Session 1, AbstractTechnologyGeology, economics Magmatism - carbon dioxide CO2
DS201412-0349
2014
Heads, H.Heads, H.How far can the influence of a local marine Diamondiferous signature be traced through an aeolian depositional system?GSSA Kimberley Diamond Symposium and Trade Show provisional programme, Sept. 10-12, POSTERAfrica, NamibiaSedimentology
DS1994-1617
1994
Heagy, A.E.Sinclair, W.D., Richardson, J.M., Heagy, A.E., Garson, D.Mineral deposits of Canada -preliminary map and deposit listGeological Survey of Canada Open file, No. 2874, 34p. 1 disk. total cost $ 47.30CanadaMineral deposit listing, Map
DS201412-0184
2014
Heagy, L.Devriese, S.G.R., Corcoran, N., Cowan, D., Davis, K., Bild-Enkin, D., Fournier, D., Heagy, L., Kang, S., Marchant, D., McMillan, M.S., Mitchell, M., Rosenkjar, G., Yang, D., Oldenburg, D.W.Magnetic inversion of three airborne dat a sets over the Tli Kwi Cho kimberlite complex.SEG Annual Meeting Denver, pp. 1790-1794 extended abstractCanada, Northwest TerritoriesGeophysics - Tli Kwi Cho
DS201412-0250
2014
Heagy, L.Fournier, D., Heagy, L., Corcoran, N., Devriese, S.G.R., Bild-Enkin, D., Davis, K., Kang, S., Marchant, D., McMillan, M.S., Mitchell, M., Rosenkjar, G., Yang, D., Oldenburg, D.W.Multi-EM systems inversion - towards a common conductivity model for Tli Kwi Cho complex.SEG Annual Meeting Denver, pp. 1795-1798. Extended abstractCanada, Northwest TerritoriesGeophysics - Tli Kwi Cho complex
DS201501-0006
2014
Heagy, L.Devriese, S.G.R., Corcoran, N., Cowan, D., Davis, K., Bild-Enkin, D., Fournier, D., Heagy, L., Kang, S., Marchant, D., McMillan, M.S., Mitchell, M., Rosenkjar, G., Yang, D., Oldenburg, D.W.Magnetic inversion of three airborne dat a sets over the Tli Kwi Cho kimberlite complex.SEG Annual Meeting Denver, 5p. Extended abstractCanada, Northwest TerritoriesDeposit - Tli Kwi Cho, geophysics

Abstract: The magnetic and electromagnetic responses from airborne systems at Tli Kwi Cho, a kimberlite complex in the Northwest Territories, Canada, have received considerable attention over the last two decades but a complete understanding of the causative physical properties is not yet at hand. Our analysis is distributed among three papers. In the first, we find a 3D magnetic susceptibility model for the area; in the second, we find a 3D conductivity model; and in the third paper, we find a 3D chargeability model. Our goal is to explain all the geophysical results within a geologic framework. In this first paper, we invert three independent airborne magnetic data sets flown over the Tli Kwi Cho kimberlite complex located in the Lac de Gras kimberlite field in Northwest Territories, Canada. The complex consists of two kimberlites known as DO-27 and DO-18. An initial airborne DIGHEM survey was flown in 1992 and AeroTEM and VTEM data subsequently acquired in 2003 and 2004, respectively. In this paper, we invert each magnetic data set in three dimensions. Both kimberlites are recovered in each model, with DO-27 as a more susceptible body than DO-18. Our goal is to simultaneously invert the three data sets to generate a single susceptibility model for Tli Kwi Cho. This project is part of a larger, on-going investigation by UBC-GIF on inverting magnetic, electromagnetic, and induced polarization data from the Tli Kwi Cho area.
DS201501-0009
2014
Heagy, L.Fournier, D., Heagy, L., Corcoran, N., Cowan, D., Devriese, S.G.R., Bild-Enkin, D., Davis, K., Kang, S., Marchant, D., McMillan, M.S., Mitchell, M., Rosenkjar, G., Yang, D., Oldenburg, D.W.Multi-EM systems inversion - towards a common conductivity model for Tli Kwi Cho complex.SEG Annual Meeting Denver, 5p. Extended abstractCanada, Northwest TerritoriesDeposit - Tli Kwi Cho, geophysics

Abstract: The magnetic and electromagnetic responses from airborne systems at Tli Kwi Cho, a kimberlite complex in the Northwest Territories, Canada, have received considerable attention over the last two decades but a complete understanding of the causative physical properties is not yet at hand. Our analysis is distributed among three posters. In the first we find a 3D magnetic susceptibility model for the area; in the second we find a 3D conductivity model; and in the third we find a 3D chargeability model that can explain the negative transient responses measured over the kimberlite pipes. In this second paper we focus upon the task of finding a conductivity model that is compatible with three airborne data sets flown between 1992 and 2004: one frequency-domain data set (DIGHEM) and two time-domain systems (AeroTEM and VTEM). The goal is to obtain a 3D model from which geologic questions can be answered, but even more importantly, to provide a background conductivity needed to complete the 3D IP inversion of airborne EM data. We begin by modifying our pre-existing 1D frequency and time domain inversion codes to produce models that have more lateral continuity. The results are useful in their own right but we have also found that 1D analysis is often very effective in bringing to light erroneous data, assisting in estimating noise floors, and providing some starting information for developing a background model for the 3D EM inversion. Here we show some results from our Laterally Constrained Inversion (LCI) framework. The recovered conductivity models seem to agree on the general location of the kimberlite pipes but disagree on the geometry and conductivity values at depth. The complete 3D inversions in time and frequency, needed to resolved these issues, are currently in progress.
DS201611-2103
2014
Heagy, L.Devriese, S.G.R., Corcoran, N., Cowan, D., Davis, K., Bild-Enkin, D., Fournier, D., Heagy, L., Kang, S., Marchant, D., McMillan, M.S., Mitchell, M., Rosenkjar, G., Yang, D., Oldenburg, D.W.Magnetic inversion of three airborne dat a sets over the Tli Kwi Cho kimberlite complex.SEG Annual Meeting Denver, pp. 1790-1794. pdfCanada, Northwest TerritoriesDeposit - Tli Kwi Cho

Abstract: The magnetic and electromagnetic responses from airborne systems at Tli Kwi Cho, a kimberlite complex in the Northwest Territories, Canada, have received considerable attention over the last two decades but a complete understanding of the causative physical properties is not yet at hand. Our analysis is distributed among three papers. In the first, we find a 3D magnetic susceptibility model for the area; in the second, we find a 3D conductivity model; and in the third paper, we find a 3D chargeability model. Our goal is to explain all the geophysical results within a geologic framework. In this first paper, we invert three independent airborne magnetic data sets flown over the Tli Kwi Cho kimberlite complex located in the Lac de Gras kimberlite field in Northwest Territories, Canada. The complex consists of two kimberlites known as DO-27 and DO- 18. An initial airborne DIGHEM survey was flown in 1992 and AeroTEM and VTEM data subsequently acquired in 2003 and 2004, respectively. In this paper, we invert each magnetic data set in three dimensions. Both kimberlites are recovered in each model, with DO-27 as a more susceptible body than DO-18. Our goal is to simultaneously invert the three data sets to generate a single susceptibility model for Tli Kwi Cho. This project is part of a larger, on-going investigation by UBC-GIF on inverting magnetic, electromagnetic, and induced polarization data from the Tli Kwi Cho area.
DS201611-2106
2016
Heagy, L.Fournier, D., Heagy, L.Where are the diamonds? - using Earth's potentialsSimPEG Team, 1p. Poster pdfTechnologyGeophysics - Magnetics, gravity
DS201611-2107
2014
Heagy, L.Fournier, D., Heagy, L., Corcoran, N., Cowan, D., Devriese, S.G.R., Bild-Enkin, D., Davis, K., Marchant, M., McMillan, M.S., Mitchell, M., Rosenkjar, G., Yang, D., Oldenburg, D.W.Multi-EM systems inversion - towards a common conductivity model for Tli Kwi Cho complex.SEG Annual Meeting Denver, pp. 1795-1799. pdfCanada, Northwest TerritoriesDeposit - Tli Kwi Cho

Abstract: The magnetic and electromagnetic responses from airborne systems at Tli Kwi Cho, a kimberlite complex in the Northwest Territories, Canada, have received considerable attention over the last two decades but a complete understanding of the causative physical properties is not yet at hand. Our analysis is distributed among three posters. In the first we find a 3D magnetic susceptibility model for the area; in the second we find a 3D conductivity model; and in the third we find a 3D chargeability model that can explain the negative transient responses measured over the kimberlite pipes. In this second paper we focus upon the task of finding a conductivity model that is compatible with three airborne data sets flown between 1992 and 2004: one frequency-domain data set (DIGHEM) and two time-domain systems (AeroTEM and VTEM). The goal is to obtain a 3D model from which geologic questions can be answered, but even more importantly, to provide a background conductivity needed to complete the 3D IP inversion of airborne EM data. We begin by modifying our pre-existing 1D frequency and time domain inversion codes to produce models that have more lateral continuity. The results are useful in their own right but we have also found that 1D analysis is often very effective in bringing to light erroneous data, assisting in estimating noise floors, and providing some starting information for developing a background model for the 3D EM inversion. Here we show some results from our Laterally Constrained Inversion (LCI) framework. The recovered conductivity models seem to agree on the general location of the kimberlite pipes but disagree on the geometry and conductivity values at depth. The complete 3D inversions in time and frequency, needed to resolved these issues, are currently in progress.
DS1992-0687
1992
Healey, C.M.Healey, C.M.Geology as a risk factor in project evaluation: its impact on reserveestimationThe Canadian Institute of Mining, Metallurgy and Petroleum (CIM) Exploration and Mining Geology, Vol. 1, No. 3, July pp. 243-250SaskatchewanGeostatistics, ore reserves, Deposits -Star Lake, Laurel Lake
DS200712-0167
2007
Healy, D.Chappell, A., Eccles, J., Fletcher, R., Healy, D.Imaging the pulsing Iceland mantle plume through the Eocene.Geology, Vol. 35, 1, pp. 93-96.Europe, IcelandGeophysics - seismics
DS201112-0191
2011
Healy, D.Clark, C., Fitzsimons, I.C.W., Healy, D., Harkley, S.L.How does the continental crust get really hot?Elements, Vol. 7, 4, August pp. 235-240.MantleMetamorphism, UHT, thermal modelling
DS201112-1048
2011
Healy, D.Timms, N.E., Kinny, P.D., Reddy, S.M., Evans, K., Clark, C., Healy, D.Relationship among titanium, rare earth elements, U-Pb ages and deformation microstructures in zircon: implications for Ti in zircon thermometry.Chemical Geology, Vol. 280, 1-2, pp. 33-46.Russia, SiberiaXenoliths
DS1983-0256
1983
Healy, J.Ginzburg, A., Mooney, W.D., Walter, A.W., Lutter, W.J., Healy, J.Deep Structure of Northern Mississippi EmbaymentAmerican Association of Petroleum Geologists Bulletin., Vol. 67, No. 11, NOVEMBER PP. 2031-3046.GlobalMid Continent
DS1981-0274
1981
Healy, J.H.Lutter, W., Peters, D., Mooney, W.D., Healy, J.H.Crustal Structure of the Mississippi Embayment; Axial ProfilEos, Vol. 62, No. 45, P. 1046. (abstract.).GlobalMid-continent
DS1987-0379
1987
HeamanKrogh, T.E., Corfu, F., Davis, Dunning, Heaman, NakamuraPrecise uranium-lead (U-Pb) isotopic ages of diabase dikes and mafic to ultramafic rocks using trace amounts of baddeleyiteHalls and Fahrig, Geological Association of Canada (GAC) Special Vol., No. 34, pp. 147-52.Quebec, Ontario, Manitoba, Northwest TerritoriesGeochronology
DS1991-1481
1991
HeamanRyan, B., Krogh, T.E., Heaman, Scharer, PhillipeOn recent geochronological studies in the Nain Province Churchill province and Plutonic Suite.Newfound. Geological Survey, Paper 91-1, pp. 257-61.Quebec, Labrador, UngavaNain Plutonic suite, Geochronology
DS2001-0610
2001
HeamanKjarsgaard, B.A., Leckie, McNeil, Heaman, McIntyreCretaceous kimberlite chaos? Fort a la Corne revisited, reworked and resolvedSaskatchewan Open House abstracts, Nov. p. 27-8.SaskatchewanGeochronology, Deposit - Fort a la Corne
DS2002-1037
2002
HeamanMcNeil, D.H., Zonnenveld, J.P., Kjarsgaard, HeamanInitial results towards a biostratigraphic chronostratigraphic framework for Albian Cenomanian...Gac/mac Annual Meeting, Saskatoon, Abstract Volume, P.75., p.75.SaskatchewanStrata - eruptive events
DS2002-1038
2002
HeamanMcNeil, D.H., Zonnenveld, J.P., Kjarsgaard, HeamanInitial results towards a biostratigraphic chronostratigraphic framework for Albian Cenomanian...Gac/mac Annual Meeting, Saskatoon, Abstract Volume, P.75., p.75.SaskatchewanStrata - eruptive events
DS1987-0430
1987
Heaman, L.Machado, N., Heaman, L.Isotope geochemistry of the Coldwell alkaline complex II evidence for crustal contamination from preliminary Sr and neodymium dat a on primary mineralsGeological Association of Canada (GAC), Vol.12, p. 69. abstractOntarioGeochronology, Isotope
DS1991-0690
1991
Heaman, L.Heaman, L., Ludden, J.N.Application of radiogenic isotope systems to problems in geologyMineralogical Association of Canada, Vol. 19, 430pGlobalBook -table of contents, Geochronology, isotopes
DS1991-0691
1991
Heaman, L.Heaman, L., Ludden, J.N.Applications of radiogenic isotope systems to problems in geologyMineralogical Association of Canada -Short Course Handbook, Vol. 19, 425pGlobalGeochronology, Radiogenic
DS1991-0692
1991
Heaman, L.Heaman, L., Parrish, R.uranium-lead (U-Pb) (U-Pb) geochronology of accessory mineralsMineralogical Association of Canada -Short Course Handbook, Vol. 19, Chapter 3, pp. 59-100GlobalGeochronology, Accessory minerals
DS1998-0599
1998
Heaman, L.Heaman, L., Teixeira, N.A., Gobbo, L., Gaspar, J.C.uranium-lead (U-Pb) mantle zircon ages for kimberlites from the Juin a and ParanatingaProvinces, Brasil.7th International Kimberlite Conference Abstract, pp. 322-4.BrazilGeochronology, Deposit - Juina
DS1998-1110
1998
Heaman, L.Pan, Y., Fleet, M.E., Heaman, L.Thermo-tectonic evolution of an Archean accretionary complex: uranium-lead (U-Pb) (U-Pb)geochronological constraintsgranulitesPrecambrian Research, Vol. 92, No. 2, Oct.l, pp. 117-28OntarioGeochronology, Quetico Subprovince
DS2002-1246
2002
Heaman, L.Percival, J.A., Brown, M., Heaman, L., Hynes, A., Rivers, T., Skulski, T.Tectonic and magmatic processes in crustal growth: a pan lithospheric perspectiveGeoscience Canada, Vol. 29, 7, Sept. pp. 121-5.MantleMafic magmatism, accretionary tectonics, collision
DS2002-1247
2002
Heaman, L.Percival, J.A., Brown, M., Heaman, L., Rivers, T., Skulski, T.Tectonic and magmatic processes in crustal growth: a pan-lithoprobe perspectiveGeoscience Canada, Vo. 29, No. 3, September pp. 121-5.Canada, MantleGeophysics - seismics, lithoprobe, rifting, arc, Accretion, collision
DS2003-0723
2003
Heaman, L.Kjarsgaard, I.M., McClenaghan, M.B., Kjarsgaard, B.A., Heaman, L.Mineralogy of the kimberlite boulders from eskers in the Kirkland Lake and Lake8 Ikc Www.venuewest.com/8ikc/program.htm, Session 8, POSTER abstractOntarioGeochemistry, geomorphology
DS2003-0972
2003
Heaman, L.Moorhead, J., Beaumier, M., Girard, R., Heaman, L.Distribution, structural controls and ages of kimberlite fields in the Superior Province of8 Ikc Www.venuewest.com/8ikc/program.htm, Session 8, POSTER abstractQuebecGeochronology, tectonics
DS200412-1012
2003
Heaman, L.Kjarsgaard, I.M., McClenaghan, M.B., Kjarsgaard, B.A., Heaman, L.Mineralogy of the kimberlite boulders from eskers in the Kirkland Lake and Lake Timiskaming areas, northeastern Ontario, Canada.8 IKC Program, Session 8, POSTER abstractCanada, OntarioDiamond exploration Geochemistry, geomorphology
DS200412-1362
2003
Heaman, L.Moorhead, J., Beaumier, M., Girard, R., Heaman, L.Distribution, structural controls and ages of kimberlite fields in the Superior Province of Quebec.8 IKC Program, Session 8, POSTER abstractCanada, QuebecDiamond exploration Geochronology, tectonics
DS200512-0402
2005
Heaman, L.Harper, C.T., Van Breeman, O., Wodick,N., Pehrsson, S., Heaman, L., Hartlaub, R.The Paleoproterozoic lithostructural history and thermotectonic reactivation of the Archean basement in southern Hearne domain of northeastern Saskatchewan.GAC Annual Meeting Halifax May 15-19, Abstract 1p.Canada, SaskatchewanTrans Hudson orogen
DS200512-0579
2004
Heaman, L.Krauss, C., Chacko, T., Heaman, L., Whiteford, S.Lower crustal xenoliths from the Diavik mine - a preliminary examination of pressure - temperature conditions.32nd Yellowknife Geoscience Forum, Nov. 16-18, p.44. (poster)Canada, Northwest TerritoriesGeochronology
DS200512-0828
2004
Heaman, L.Patterson, M.,Heaman, L.The origin of diabase dykes in the Lac du Sauvage - Lac de Gras area, NWT.32nd Yellowknife Geoscience Forum, Nov. 16-18, p.58. (poster)Canada, Northwest TerritoriesMafic magmatism
DS200912-0384
2009
Heaman, L.Kjarsgaard, B.A., Harvey, S., McClintock, M., Zonneveld, J.P., Du Plessis, P., McNeil, D., Heaman, L.Geology of the Orion South kimberlite, Fort a la Corne, Canada.Lithos, In press - available formatted 15p.Canada, SaskatchewanDeposit - Orion South
DS201012-0025
2010
Heaman, L.Aulbach, S., Stachel, T., Heaman, L., creaser, R., Shirey, S.Formation of cratonic subcontinental lithospheric mantle from hybrid plume sources.Goldschmidt 2010 abstracts, abstractMantleSubduction
DS201012-0720
2010
Heaman, L.Smart, K., Chacko, T., Heaman, L., Stachel, T., Muehlenbachs, K.13 C depleted diamonds in Jericho eclogites: diamond formation from ancient subducted organic matter.Goldschmidt 2010 abstracts, abstractCanada, NunavutDeposit - Jericho
DS201012-0779
2010
Heaman, L.Tappe, S., Pearson, D.G., Heaman, L., Nowell, G., Milstead, P.Relative roles of cratonic lithosphere and asthenosphere in controlling kimberlitic magma compositions: Sr Nd Hf isotope evidence fromGoldschmidt 2010 abstracts, abstractEurope, Greenland, Canada, LabradorGeochronology
DS201112-0281
2010
Heaman, L.Donatti Filho, J.P., Paiva de Oliveira, E., Tappeb, S., Heaman, L.U Pb TIMS perovskite dating of the Brauna kimberlite field, Sao Francisco craton - Brazil: constraints on Neoproterozoic alkaline magmatism.5th Brasilian Symposium on Diamond Geology, Nov. 6-12, abstract p. 81.South America, BrazilGeochronology
DS201312-0777
2013
Heaman, L.Sarkar, C., Heaman, L., Pearson, D.G.Detailed geochemical studies of Lac de Gras kimberlites - redefining the 'diamond age window'?Geoscience Forum 40 NWT, abstract only p. 43Canada, Northwest TerritoriesDeposit - Lac de gras ones
DS201412-0685
2014
Heaman, L.Petts, D., Stern, R., Stachel, T., Chacko, T., Heaman, L.A nitrogen isotope fractionation factor between diamond and fluid derived from detailed SIMS analysis of an eclogitic diamond.Goldschmidt Conference 2014, 1p. AbstractTechnologyGeochronology
DS201708-1667
2017
Heaman, L.Heaman, L.Ages and sources of mantle eclogites: ID-TIMS-U-Pb-Sr isotope systematics of clinopyroxene.11th. International Kimberlite Conference, PosterMantleeclogite
DS201904-0787
2019
Heaman, L.Tappert, R., Foden, J., Heaman, L., Tappert, M.C., Zurevinski, S.E., Wills, K.The petrology of kimberlites from South Australia: linking olivine macrocrystic and micaceous kimberlites.Journal of Volacnology and Geothermal Research, Vol. 373, pp. 68-96.Australia, South Australiadeposit - Eurelia

Abstract: Kimberlites of Jurassic age occur in various parts of South Australia. Thirty-nine of these kimberlites, which are mostly new discoveries, were studied to characterize their structural setting, their petrography, and the composition of their constituent minerals. Although some of the kimberlites in South Australia occur on the Archean to Paleoproterozoic Gawler Block, most are part of a northwest-trending, semi-continuous kimberlite dike swarm located in the Adelaide Fold Belt. The kimberlites typically occur as dikes or sills, but diatremes are also present. In the Adelaide Fold Belt, diatremes are restricted to the hinge zones of regional-scale folds within thick sedimentary sequences of the Adelaidean Supergroup. Despite widespread and severe alteration, coherent and pyroclastic kimberlites can be readily distinguished. U-Pb and Sr/Nd isotopic compositions of groundmass perovskite indicate that all kimberlites belong to the same age group (177-197?Ma) and formed in a near-primitive mantle environment (87Sr/86Sr: 0.7038-0.7052, eNd: -0.07 to +2.97). However, the kimberlites in South Australia are compositionally diverse, and range from olivine-dominated varieties (macrocrystic kimberlites) to olivine-poor, phlogopite-dominated varieties (micaceous kimberlites). Macrocrystic kimberlites contain magnesium-rich groundmass phlogopite and spinel, and they are typically olivine macrocryst-rich. Micaceous kimberlites, in contrast, contain more iron- and titanium-rich groundmass phlogopite and less magnesian spinel, and olivine macrocrysts are rare or absent. Correlations between phlogopite and spinel compositions with modal abundances of olivine, indicate that the contrast between macrocrystic and micaceous kimberlites is primarily linked to the amount of mantle components that were incorporated into a compositionally uniform parental mafic silicate melt. We propose that assimilation of xenocrystic magnesite and incorporation of xenocrystic olivine from dunitic source rocks were the key processes that modified the parental silicate melt and created the unique hybrid (carbonate-silicate) character of kimberlites. Based on the composition of xenoliths and xenocrysts, the lithospheric mantle sampled by the South Australian kimberlites is relatively uniform, and extends to depths of 160-170?km, which is slightly below the diamond stability field. Only beneath the Eurelia area does the lithosphere appear thicker (>175?km), which is consistent with the presence of diamonds in some of the Eurelia kimberlites.
DS202008-1398
2020
Heaman, L.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.
DS201112-0044
2011
Heaman, L.H.Aulbach, S., Stachel, T., Heaman, L.H., Carlson, J.A.Microxenoliths from the Slave Craton: archives of diamond formation along fluid conduits.Lithos, Vol. 126, pp. 419-434.Canada, Northwest TerritoriesEclogite, subduction, metasomatism, Ekati
DS201912-2789
2019
Heaman, L.H.Heaman, L.H., Phillips, D., Pearson, D.G.Dating kimberlite: methods and emplacement patterns through time.Elements, Vol. 15, 6, pp.Mantlegeochronology
DS1986-0352
1986
Heaman, L.M.Heaman, L.M., et al.Precise uranium-lead (U-Pb) zircon ages for the Molson dike swarm and the Fox River sill:constraints for Early ProterozoicContributions to Mineralogy and Petrology, Vol. 94, pp. 82-89.ManitobaGeochronology, Dike - Molson
DS1987-0378
1987
Heaman, L.M.Krogh, T.E., Corfu, F., Davis, D.W., Dunning, G.R., Heaman, L.M.Precise uranium-lead (U-Pb) (U-Pb) ages of diabase dykes and mafic to ultramafic rocks usingGeological Association of Canada (GAC) Special Paper, No. 34, p. 151QuebecIle Bizard kimberlite brief mention
DS1989-0603
1989
Heaman, L.M.Heaman, L.M.uranium-lead (U-Pb) (U-Pb) dating of mafic dyke swarms: what are the options?New Mexico Bureau of Mines Bulletin., Continental Magmatism Abstract Volume, Held, Bulletin. No. 131, p. 125 Abstract held June 25-July 1GlobalGeochronology, Dykes
DS1989-0604
1989
Heaman, L.M.Heaman, L.M.The nature of the subcontinental mantle from Sr-Neodymium-Palladium isotopic studies onkimberlitic perovskiteEarth and Planetary Science Letters, Vol. 92, pp. 323-334Ontario, Kirkland LakeMantle, Geochronology-isotopes
DS1989-0605
1989
Heaman, L.M.Heaman, L.M.An example of anomalous uranium-lead (U-Pb) (U-Pb) discordance patterns inbaddeleyitefrom the Ile Bizard intrusion MontrealGeological Association of Canada (GAC) Annual Meeting Program Abstracts, Vol. 14, p. A71. (abstract.)QuebecGeochronology
DS1989-0606
1989
Heaman, L.M.Heaman, L.M., Tarney, J.uranium-lead (U-Pb) (U-Pb) baddeleyite ages for the Scourie dyke swarm,Scotland: evidence for two distinct intrusion eventsNature, Vol. 340, August 31, pp. 705-708ScotlandDyke, Age determination -picrit
DS1989-0742
1989
Heaman, L.M.Kamo, S.L., Heaman, L.M., Lumbers, S.B.Age for a lamprophyre dyke, Callander Bay, Ontario:use of Ti bearing minerals as a potentialgeochronometerGeological Association of Canada (GAC) Annual Meeting Program Abstracts, Vol. 14, p. A41. (abstract.)OntarioGeochronology
DS1989-0866
1989
Heaman, L.M.LeCheminant, A.N., Heaman, L.M.Hotspot origin for giant radiating dyke swarms:evidence from the Mackenzie igneous events, CanadaNew Mexico Bureau of Mines Bulletin., Continental Magmatism Abstract Volume, Held, Bulletin. No. 131, p. 160. AbstractNorthwest TerritoriesDykes
DS1989-0867
1989
Heaman, L.M.LeCheminant, A.N., Heaman, L.M.Mackenzie igneous events, Canada: Middle Proterozoic hotspot magmatism associated with ocean openingEarth and Planetary Science Letters, Vol. 96, pp. 38-48Northwest Territories, SaskatchewanDykes, Geochronology
DS1990-0365
1990
Heaman, L.M.Corriveau, L., Heaman, L.M., Marcantonio, F., Vanbreemen, O.1.1 GA potassium-rich alkaline plutonism in the southwest Grenville province-Contributions to Mineralogy and Petrology, Vol. 105, No. 4, pp. 473-485OntarioAlkaline rocks, Geochronology
DS1990-0681
1990
Heaman, L.M.Heaman, L.M., Bowins, R., Crocket, J.The chemical composition of igneous zircon suites: implications for geochemical tracer studiesGeochimica et Cosmochimica Acta, Vol. 54, pp. 1597-1607South Africa, OntarioKimberlites, Carbonatite, Geochemistry -zircon
DS1991-0968
1991
Heaman, L.M.LeCheminant, A.N., Heaman, L.M.uranium-lead (U-Pb) (U-Pb) ages for the 1.27 Ga Mackenzie igneous events, Canada: support for aplume initiation modelGeological Association of Canada (GAC)/Mineralogical Association of Canada/Society Economic, Vol. 16, Abstract program p. A73Northwest TerritoriesGeochronology, Dykes
DS1991-1197
1991
Heaman, L.M.Moser, D.E., Krogh, T.E., Heaman, L.M., Hanes, J.A., Helmstaedt, H.The age and significance of Archean mid-crustal extension in the Kapuskasing uplift, Superior Province, CanadaGeological Society of America Annual Meeting Abstract Volume, Vol. 23, No. 5, San Diego, p. A 134OntarioTectonics, Kapuskasing uplift
DS1991-1305
1991
Heaman, L.M.Patterson, J.G., Heaman, L.M.New geochronologic limits on the depositional age of the Hurwitz Group, Trans-Hudson hinterland, CanadaGeology, Vol. 19, No. 11, November pp. 1137-1140Northwest TerritoriesGeochronology, Structure
DS1992-0596
1992
Heaman, L.M.Gower, C.F., Sharer, U., Heaman, L.M.The Labradorian Orogeny in the Grenville Province, eastern Labrador, Canada.Canadian Journal of Earth Sciences, Vol. 29, pp. 1944-57.Quebec, Labrador, UngavaOrogeny, Tectonics
DS1992-0688
1992
Heaman, L.M.Heaman, L.M., LeCheminant, A.N.uranium-lead (U-Pb) (U-Pb) systematics of mantle derived zircon and baddeleyite xenocrysts:implications for excess 208Pb in the mantleV.m. Goldschmidt Conference Program And Abstracts, Held May 8-10th. Reston, p. A 49. abstractMantleGeochronology, Zircon, badeleyite
DS1992-0689
1992
Heaman, L.M.Heaman, L.M., LeCheminant, A.N., Rainbird, R.H.Nature and timing of Franklin igneous events, Canada: implications for a Late Proterozoic mantle plume and the break-up of LaurentiaEarth and Planetary Science Letters, Vol. 109, No. 1-2, March pp. 117-132GlobalMantle, Proterozoic
DS1992-0690
1992
Heaman, L.M.Heaman, L.M., Machado, N.Timing and origin of Midcontinent rift alkaline magmatism, North America:evidence from the Coldwell ComplexContributions to Mineralogy and Petrology, Vol. 110, No. 2-3, pp. 289-303OntarioAlkaline, Midcontinent Rift
DS1992-0691
1992
Heaman, L.M.Heaman, L.M., Machado, N.Timing and orogen of midcontinent rift alkaline magmatism, North America:evidence from the Coldwell complexMineralogy and Petrology, Vol. 110, No. 2/3, pp. 289-303OntarioTectonics, Alkaline magmatism
DS1992-1248
1992
Heaman, L.M.Rainbird, R.H., Heaman, L.M., Young, G.Sampling Laurentia: detrital zircon geochronology offers evidence for an extensive Neoproterozoic river system originating from the Grenville orogenGeology, Vol. 20, No. 4, April pp. 351-354Victoria IslandShaler Group, Geochronology
DS1993-0646
1993
Heaman, L.M.Heaman, L.M., LeCheminant, A.N.Paragenesis and uranium-lead (U-Pb) (U-Pb) systematics of baddeleyiteChemical Geology, Vol. 110, No. 1-3, November 25, pp. 95-126.GlobalGeochronology
DS1995-0030
1995
Heaman, L.M.Amelin, Yu.V., Heaman, L.M., Semenov, V.S.Uranium-lead (U-Pb) geochronology of layered mafic intrusions in the eastern BalticShield: implications for timing and duration..Precambrian Research, Vol. 75, pp. 31-46.Russia, Baltic States, Kola PeninsulaGeochronology, Pechenga, nickel, platinum group elements (PGE), Ultramafic intrusions
DS1995-0779
1995
Heaman, L.M.Heaman, L.M., Mitchell, R.H.Constraints on the emplacement of age of Yakutian province kimberlites from uranium-lead (U-Pb) (U-Pb) perovskite dating.Proceedings of the Sixth International Kimberlite Conference Extended Abstracts, p. 223-24.Russia, Yakutia, Ontario, Kirkland LakeGeochronology, Malo Batuobinsk, Daldyn Alakit, Kuika, Olenek, Velikan
DS1996-0343
1996
Heaman, L.M.Davis, W.J., Parrish, R.R., Roddick, J.C., Heaman, L.M.Isotopic age determinations of kimberlites and related rocks: methods andapplications.Geological Survey of Canada, LeCheminant ed, OF 3228, pp. 39-42.CanadaTechniques -Geochronology, Kimberlites
DS1996-0754
1996
Heaman, L.M.Kjarsgaard, B.A., Heaman, L.M.Distinct emplacement periods of Phanerozoic kimberlites in North America, and implications for Slave Province.northwest Territories Exploration overview 1995, March pp. 3-22. 1p. abstractNorthwest TerritoriesGeochronology, Slave Province
DS1996-0823
1996
Heaman, L.M.LeCheminant, A.N., Heaman, L.M., Van Breemen, O., et al.Mafic magmatism, mantle roots and kimberlites in the Slave CratonGeological Survey of Canada, LeCheminant ed, OF 3228, pp. 161-169.Northwest TerritoriesCraton - dykes, plumes, rifting, Mackenzie Dyke swarm
DS1996-0998
1996
Heaman, L.M.Moser, D.E., Heaman, L.M., Krogh, T.E., Hanes, J.A.Intracrustal extension of an Archean orogen revealed using single grain Ulead zircon geothermometry.Tectonics, Vol. 15, No. 5, Oct. pp. 1093-1109.OntarioSuperior Province, Wawa domain, Geochronology, Wawa gneiss domain
DS1996-1150
1996
Heaman, L.M.Queen, M., Heaman, L.M., Hanes, J.A., Archibald, B.A.40Ar/39Ar phlogopite and U- lead perovskite dating of lamprophyre dykes From the eastern Lake Superior regionCanadian Journal of Earth Sciences, Vol. 33, No. 6, June pp. 958-965.OntarioMidcontinent Rift volcanism., Geochronology
DS1997-0495
1997
Heaman, L.M.Heaman, L.M.Global mafic magmatism at 2.45 Ga: remnants of an ancient large igneousprovince.Geology, Vol. 25, No. 4, April pp. 299-302.OntarioHearst Matachewan, Dike swarms
DS1997-0496
1997
Heaman, L.M.Heaman, L.M., Kjarsgaard, B., Creaser, R.A., CookenbooMultiple episodes of kimberlite magmatism in the Slave Province, NorthAmerica.Lithoprobe Slave/SNORCLE., pp. 14-17.Northwest TerritoriesMagmatism
DS1997-0820
1997
Heaman, L.M.Moser, D.E., Heaman, L.M.Proterozoic zircon growth in Archean lower crustal xenoliths, southern Superior craton -Contributions to Mineralogy and Petrology, Vol. 128, No. 2-3, pp. 164-175.OntarioMatachewan ocean opening, Tectonics, arc
DS1998-0600
1998
Heaman, L.M.Heaman, L.M., Creaser, R.A., Cookenboo, H.O.Zircons from eclogite in the Jericho kimberlite pipe: evidence for Proterozoic high pressure metamorphism...7th International Kimberlite Conference Abstract, pp. 325-7.Northwest TerritoriesSlave Province, geochronology, Deposit - Jericho
DS1998-0840
1998
Heaman, L.M.LeCheminant, A.N., Heaman, L.M., Kretschmar, LeCouteurComplex origins and multiple ages of mantle zircon megacrysts from Canadian and South African kimberlites.7th International Kimberlite Conference Abstract, pp. 486-8.Northwest Territories, South Africascanning electron microscope (SEM) and backscatter electron (BSE) imaging on zircons, Deposit - Drybones Bay, Kaalvallei, Leceister
DS1999-0026
1999
Heaman, L.M.Ashton, K.E., Heaman, L.M., Lewry, HartlaubAge and origin of the Jan Lake Complex: a glimpse at the buried Archean craton of the Trans Hudson Orogen.Canadian Journal of Earth Sciences, Vol. 36, No. 2, Feb. pp. 185-208.Manitoba, SaskatchewanLithoprobe, Geophysics - seismics
DS1999-0517
1999
Heaman, L.M.Noyes, A.K., Heaman, L.M.An overview of radiometric techniques used to determine kimberlite emplacement ages.Assocation of Exploration Geologists (AEG) 19th. Diamond Exploration Methods Case Histories, pp. 108-117.GlobalKimberlite, Geochronology - review
DS2000-0138
2000
Heaman, L.M.Card, C.D., Bethune, K.M., Ashton, K.E., Heaman, L.M.The Oldman Bulyea shear zone: the Nevins Lake Block - Train Lake domain boundary, eastern Rae Province.Geological Association of Canada (GAC)/Mineralogical Association of Canada (MAC) 2000 Conference, 4p. abstractSaskatchewan, Western CanadaDeformation - stratigraphy, Tectonics
DS2000-0380
2000
Heaman, L.M.Halls, H.C., Heaman, L.M.The paleomagnetic significance of new uranium-lead (U-Pb) age dat a from the Molson dike swarm, Causchon Lake area.Canadian Journal of Earth Sciences, Vol. 37, No. 6, June pp. 957-66.ManitobaGeochronology, Molson dyke swarm
DS2000-0400
2000
Heaman, L.M.Heaman, L.M., Kjarsgaard, B.A.Timing of eastern North American kimberlite magmatism: continental extension of the Great Meteor Hotspot trackEarth and Planetary Science Letters, Vol. 178, No. 3-4, May 30, pp. 253-68.Ontario, ManitobaGeochronology - age determinations, Magmatism - craton
DS2000-0882
2000
Heaman, L.M.Sgarbi, G.N., Heaman, L.M.uranium-lead (U-Pb) perovskite ages for Brazilian kamafugitesIgc 30th. Brasil, Aug. abstract only 1p.Brazil, ParaguayKamafugites, Geochronology
DS2001-0463
2001
Heaman, L.M.Heaman, L.M.The timing of kimberlite emplacement and implications for diamond exploration.Prospectors and Developers Association of Canada (PDAC) 2001, 1p. abstractNorthwest TerritoriesDiamond - exploration brief overview, Geochronology
DS2001-0464
2001
Heaman, L.M.Heaman, L.M., LeCheminant, A.N.Anomalous uranium-lead (U-Pb) systematics in mantle derived baddeleyite xenocrysts from Ile Bizard: evidence ...Chemical Geology, Vol. 172, No. 1-2, Feb. pp. 77-93.QuebecGeochronology, High temperature radon diffusion
DS2002-0072
2002
Heaman, L.M.Ashton, K.E., Hartlaub, R.P., Heaman, L.M.,Card, C.D.Neoarchean history of the Rae province in northern Saskatchewan: insights into Archean tectonism.Gac/mac Annual Meeting, Saskatoon, Abstract Volume, P.4., p.4.SaskatchewanTectonics
DS2002-0073
2002
Heaman, L.M.Ashton, K.E., Hartlaub, R.P., Heaman, L.M.,Card, C.D.Neoarchean history of the Rae province in northern Saskatchewan: insights into Archean tectonism.Gac/mac Annual Meeting, Saskatoon, Abstract Volume, P.4., p.4.SaskatchewanTectonics
DS2002-0074
2002
Heaman, L.M.Ashton, K.E., Hartlaub, R.P., Heaman, L.M.,MoreilliPaleoproterozoic history of the Rae Province in northern saskatchewan: the The lon Taitson Trans HudsonGac/mac Annual Meeting, Saskatoon, Abstract Volume, P.4., p.4.SaskatchewanTectonics
DS2002-0075
2002
Heaman, L.M.Ashton, K.E., Hartlaub, R.P., Heaman, L.M.,MoreilliPaleoproterozoic history of the Rae Province in northern saskatchewan: the The lon Taitson Trans HudsonGac/mac Annual Meeting, Saskatoon, Abstract Volume, P.4., p.4.SaskatchewanTectonics
DS2002-0181
2002
Heaman, L.M.Bohm, C.O., Heaman, L.M., Creaser, R.A., Corkery, SternTectonic assembly of the Trans Hudson: Superior boundary zone in northern Manitoba: Paleoarchean crustGac/mac Annual Meeting, Saskatoon, Abstract Volume, P.11., p.11.ManitobaCollision, Geochronology
DS2002-0182
2002
Heaman, L.M.Bohm, C.O., Heaman, L.M., Creaser, R.A., Corkery, SternTectonic assembly of the Trans Hudson: Superior boundary zone in northern Manitoba: Paleoarchean crustGac/mac Annual Meeting, Saskatoon, Abstract Volume, P.11., p.11.ManitobaCollision, Geochronology
DS2002-0480
2002
Heaman, L.M.French, J.E., Heaman, L.M., Chacko, T.Feasibility of chemical U Th total Pb baddeleyite dating by electron microprobeChemical Geology, Vol. 188,1-2,pp.85-104.Northwest Territories, South AfricaGeochronology - Great Bear, Moore Lakes, Muskox, Phalaborwa, carbonatite
DS2002-0661
2002
Heaman, L.M.Hartlaub, R.P.,Heaman, L.M., Ashton, Chacko, CreaserWas there an - 2000 km long Neoarchean extensional event in the Rae Craton? Evidence from the Murmac Bay..Gac/mac Annual Meeting, Saskatoon, Abstract Volume, P.46., p.46.SaskatchewanGeochronology
DS2002-0662
2002
Heaman, L.M.Hartlaub, R.P.,Heaman, L.M., Ashton, Chacko, CreaserWas there an - 2000 km long Neoarchean extensional event in the Rae Craton? Evidence from the Murmac Bay..Gac/mac Annual Meeting, Saskatoon, Abstract Volume, P.46., p.46.SaskatchewanGeochronology
DS2002-0663
2002
Heaman, L.M.Hartlaub, R.P.,Heaman, L.M., Ashton, Chacko, CreaserExtent of Rae Craton basement: evidence of an ancient >3.7 Ga component from U Pb Nd isotope studies.Gac/mac Annual Meeting, Saskatoon, Abstract Volume, P.47., p.47.SaskatchewanGeochronology
DS2002-0664
2002
Heaman, L.M.Hartlaub, R.P.,Heaman, L.M., Ashton, Chacko, CreaserExtent of Rae Craton basement: evidence of an ancient >3.7 Ga component from U Pb Nd isotope studies.Gac/mac Annual Meeting, Saskatoon, Abstract Volume, P.47., p.47.SaskatchewanGeochronology
DS2002-0684
2002
Heaman, L.M.Heaman, L.M.Musings on 2.45 Ga Earth: the temporal link between global mafic magmatism and high grade metamorphism.Gac/mac Annual Meeting, Saskatoon, Abstract Volume, P.48., p.48.GlobalMagmatism - igneous provinces, dykes
DS2002-0685
2002
Heaman, L.M.Heaman, L.M.Musings on 2.45 Ga Earth: the temporal link between global mafic magmatism and high grade metamorphism.Gac/mac Annual Meeting, Saskatoon, Abstract Volume, P.48., p.48.GlobalMagmatism - igneous provinces, dykes
DS2002-0686
2002
Heaman, L.M.Heaman, L.M., Creaser, R.A., Cookenboo, H.O.Extreme enrichment of high field strength elements in Jericho eclogite xenoliths: a cryptic record of Paleoproterozoic subduction, partial melting...Geology, Vol. 30,6, June,pp. 507-10.Northwest Territories, NunavutMetasomatism - Slave Craton, Deposit - Jericho
DS2002-0687
2002
Heaman, L.M.Heaman, L.M., Erdmer, P., Owne, J.V.U Pb geochronologic constraints on the crustal evolution of the Long Range Inlier, Newfoundland.Canadian Journal of Earth Science, Vol.39,5, May, pp.845-65.NewfoundlandGeochronology
DS2002-0688
2002
Heaman, L.M.Heaman, L.M., Kjarsgaard, B.A.A Cretaceous corridor of kimberlite magmatism: U Pb results from the Fort a la Corne field.Gac/mac Annual Meeting, Saskatoon, Abstract Volume, P.47., p.47.SaskatchewanGeochronology
DS2002-0689
2002
Heaman, L.M.Heaman, L.M., Kjarsgaard, B.A.A Cretaceous corridor of kimberlite magmatism: U Pb results from the Fort a la Corne field.Gac/mac Annual Meeting, Saskatoon, Abstract Volume, P.47., p.47.SaskatchewanGeochronology
DS2002-1029
2002
Heaman, L.M.McClenaghan, M.B., Kjarsgaard, I.M., Kjardsgaard, B.A., Heaman, L.M.Mineralogy of kimberlite boulders from eskers in the Lake Timiskaming and Kirkland Lake areas, northeastern Ontario.Geological Survey of Canada Open File, No.4361, 1 CD $ 26.OntarioGeochemistry - database CD
DS2003-0128
2003
Heaman, L.M.Bohm, C.O., Heaman, L.M.Kimberlite potential of the NW Superior Craton and Superior boundary zoneManitoba Annual Convention, Nov. 13, 1/4p. abstract.ManitobaNews item - craton, hotspot
DS2003-0364
2003
Heaman, L.M.Eccles, D.R., Heaman, L.M., Luth, R.W., Creaser, R.A.Petrogenetic considerations for the Late Cretaceous northern Alberta kimberlite8 Ikc Www.venuewest.com/8ikc/program.htm, Session 7, AbstractAlbertaKimberlite petrogenesis
DS2003-0568
2003
Heaman, L.M.Heaman, L.M., Creaser, R.A., Cookenboo, H.O., Chacko, T.Multi stage modification of the mantle lithosphere beneath the Slave Craton: evidence8ikc, Www.venuewest.com/8ikc/program.htm, Session 2, POSTER abstractNunavutEclogites and Diamonds, Deposit - Jericho
DS2003-0569
2003
Heaman, L.M.Heaman, L.M., Kjarsgaard, B.A.The temporal evolution of North American kimberlite magmatism8 Ikc Www.venuewest.com/8ikc/program.htm, Session 7, AbstractCanada, United StatesKimberlite petrogenesis, Geochronology
DS2003-0570
2003
Heaman, L.M.Heaman, L.M., Kjarsgaard, B.A., Creaser, R.A.The timing of kimberlite magmatism in North America: implications for global kimberliteLithos, Vol. 71, 2-4, pp. 153-184.Northwest TerritoriesGeochronology
DS2003-1398
2003
Heaman, L.M.Upton, B.G., Emeleus, C.H., Heaman, L.M., Goodenough, K.M., Finch, A.A.Magmatism of the mid-Proterozoic Gardar Province, South Greenland: chronologyLithos, Vol. 68, 1-2, pp. 43-65.GreenlandMagmatism
DS2003-1400
2003
Heaman, L.M.Upton, B.G.J., Emeleus, C.H., Heaman, L.M., Goodenough, K.M., Finch, A.A.Magmatism of the mid-Proterozoic Gardar Province, south Greenland: chronologyLithos, Vol. 68, May, pp. 43-65.GreenlandDyke swarms, basalts
DS200412-0177
2003
Heaman, L.M.Bohm, C.O., Heaman, L.M.Kimberlite potential of the NW Superior Craton and Superior boundary zone.Manitoba Geological Survey, Nov. 13, 1/4p. abstract.Canada, ManitobaNews item - craton, hotspot
DS200412-0500
2003
Heaman, L.M.Eccles, D.R., Heaman, L.M., Luth, R.W., Creaser, R.A.Petrogenetic considerations for the Late Cretaceous northern Alberta kimberlite province.8 IKC Program, Session 7, AbstractCanada, AlbertaKimberlite petrogenesis
DS200412-0806
2004
Heaman, L.M.Hay, S.E., Heaman, L.M., Strand, P.The Churchill kimberlites: a newly discovered Diamondiferous kimberlite province in Nunavut Canada.Geological Association of Canada Abstract Volume, May 12-14, SS14-06 p. 265.abstractCanada, NunavutPetrography
DS200412-0810
2004
Heaman, L.M.Heaman, L.M., Gower, C.F., Perreault, S.The timing of Proterozoic magmatism in the Pinware terrane of southeast Labrador, easternmost Quebec and northwest Newfoundland.Canadian Journal of Earth Sciences, Vol. 41, 2, February pp. 127-150.Canada, Quebec, LabradorMagmatism, geochronology
DS200412-0811
2003
Heaman, L.M.Heaman, L.M., Kjarsgaard, B.A.The temporal evolution of North American kimberlite magmatism.8 IKC Program, Session 7, AbstractCanada, United StatesKimberlite petrogenesis Geochronology
DS200412-0812
2003
Heaman, L.M.Heaman, L.M., Kjarsgaard, B.A., Creaser, R.A.The timing of kimberlite magmatism in North America: implications for global kimberlite genesis and diamond exploration.Lithos, Vol. 71, 2-4, pp. 153-184.Canada, Northwest TerritoriesGeochronology
DS200412-1013
2004
Heaman, L.M.Kjarsgaard, I.M., McClenaghan, M.B., Kjarsgaard, B.A., Heaman, L.M.Indicator mineralogy of kimberlite boulders from eskers in the Kirkland Lake and Lake Timiskaming areas, Ontario, Canada.Lithos, Vol. 77, 1-4, Sept. pp. 705-731.Canada, Ontario, Kirkland LakeMunro, Misema River eskers, Sharp lake, geomorphology
DS200412-1272
2004
Heaman, L.M.McHattie, T.G., Heaman, L.M., Creaser, R.A., Skulski, T., Sandeman, H.Dynamic melting in an Archean mantle plume: chemical signature of Prince Albert Group komatiite and basalt, Nunavut Canada.Geochimica et Cosmochimica Acta, 13th Goldschmidt Conference held Copenhagen Denmark, Vol. 68, 11 Supp. July, ABSTRACT p.A595.Canada, NunavutMantle plume
DS200412-1791
2004
Heaman, L.M.Sgarbi, P.B., Heaman, L.M., Gaspar, J.C.U Pb perovskite for Brazialian kamafugitic rocks: further support for a temporal link to a mantle plume hotspot track.Journal of South American Earth Sciences, Vol. 16, 8, pp. 715-724.South America, Brazil, GoiasGeochemistry, geochronology, alkaline province
DS200412-2024
2003
Heaman, L.M.Upton, B.G., Emeleus, C.H., Heaman, L.M., Goodenough, K.M., Finch, A.A.Magmatism of the mid-Proterozoic Gardar Province, South Greenland: chronology, petrogenesis and geological setting.Lithos, Vol. 68, 1-2, pp. 43-65.Europe, GreenlandMagmatism
DS200412-2026
2003
Heaman, L.M.Upton, B.G.J., Emeleus, C.H., Heaman, L.M., Goodenough, K.M., Finch, A.A.Magmatism of the mid-Proterozoic Gardar Province, south Greenland: chronology, petrogenesis and geological setting.Lithos, Vol. 68, May, pp. 43-65.Europe, GreenlandDyke swarms, basalts
DS200412-2238
2003
Heaman, L.M.Zonneveld, J.P., Kjarsgaard, B.A., Harvey, S.E., Marcia, K.Y., McNeil, D., Heaman, L.M., White, D.J.Sedimentologic and stratigrahic constraints on emplacement of the Star kimberlite, east central Saskatchewan.8 IKC Program, Session 1, AbstractCanada, SaskatchewanGeology, economics Deposit - Star
DS200512-0303
2004
Heaman, L.M.French, J.E., Heaman, L.M., Chacko, T., Rivard, B.Global mafic magmatism and continental breakup at 2.2 Ga: evidence from the Dharwar Craton, India.Geological Society of America Annual Meeting ABSTRACTS, Nov. 7-10, Paper 142-10, Vol. 36, 5, p. 340.IndiaMagmatism
DS200512-0411
2004
Heaman, L.M.Heaman, L.M.2.5-2.4 GA global magmatism: remnants of supercontinents or production of superplumes?Geological Society of America Annual Meeting ABSTRACTS, Nov. 7-10, Paper 105-5, Vol. 36, 5, p.255.MantleMagmatism, cratons, age determinations, geochronology
DS200512-0882
2005
Heaman, L.M.Purves, M.C., Heaman, L.M., Creaser, R.A., Schmidberger, S.S., Simoneti, A.Origin and isotopic evolution of the Muskox intrusion, Nunavut.GAC Annual Meeting Halifax May 15-19, Abstract 1p.Canada, NunavutLayered intrusion - ultramafic
DS200512-1036
2005
Heaman, L.M.Srivastava, R.K., Heaman, L.M., Sinha, A.K., Shihua, S.Emplacement age and isotope geochemistry of Sung Valley alkaline carbonatite complex, Shillong Plateau, northeastern India: implications for primary carbonateLithos, Vol. 81, 1-4, April pp. 33-54.IndiaMelt, silicate rocks, geochronology, Kerguelen plume
DS200512-1110
2005
Heaman, L.M.Upton, B.G.J., Ramo, O.T., Heaman, L.M., Blichert-Toft, J., Kalsbeek, F., Barry, T.L., Jepsen, H.F.The Mesoproterozoic Zig-Zag Dal basalts and associated intrusions of eastern North Greenland: mantle plume lithosphere interaction.Contributions to Mineralogy and Petrology, Vol. 149, 1, pp. 40-56.Europe, GreenlandTectonics
DS200612-0545
2005
Heaman, L.M.Hartlaub, R.P., Chacko, T., Heaman, L.M., Creaser, R.A., Ashton, K.E., Simonetti, A.Ancient (Meso-Paleoarchean) crust in the Rae Province, Canada: evidence from Sm-Nd and U-Pb constraints.Precambrian Research, Vol. 141, 3-4, Nov. 20, pp. 137-153.Canada, Saskatchewan, Alberta, Northwest TerritoriesGeochronology, crustal recycling
DS200612-0546
2006
Heaman, L.M.Hartlaub, R.P., Heaman, L.M., Simonetti, A., Bohm, C.O.Relicts of Earth's crust: U Pb, Lu Hf and morphological characteristics of > 3.7 Ga detrital zircon of the western Canadian Shield.Geological Society of America, Processes on the Earth, Special Paper 405, Chapter 5.CanadaGeochronology
DS200612-0547
2006
Heaman, L.M.Harvey, S., Kjarsgaard, B.A., Zonneveld, J.P., Heaman, L.M., McNeil, D.Volcanology and sedimentology of distinct eruptive phases at the Star kimberlite, Fort a la Corne field, Saskatchewan.Emplacement Workshop held September, 5p. extended abstractCanada, SaskatchewanDeposit - Star geology
DS200612-0556
2006
Heaman, L.M.Heaman, L.M., Creaser, R.A., Cookenboo, H.O., Chacko, T.Multi stage modification of the northern Slave mantle lithosphere: evidence from zircon and diamond bearing eclogite xenoliths entrained in Jericho kimberlite.Journal of Petrology, Vol. 47, 4, April pp. 821-858.Canada, NunavutGeochronology - Jericho
DS200612-0706
2006
Heaman, L.M.Kjarsgaard, B.A., Harvey, S.E., Zonneveld, J.P., Heaman, L.M., White, D., MacNeil, D.Volcanic stratigraphy, eruptive sequences and emplacement of the 140/141 kimberlite Fort a la Corne field, Saskatchewan.Emplacement Workshop held September, 5p. extended abstractCanada, SaskatchewanDeposit - 140/141 geology
DS200612-1240
2005
Heaman, L.M.Schmidberger, S.S., Heaman, L.M., Simonetti, A., Craser, R.A., Cookenboo, H.O.Formation of Paleoproterozoic eclogitic mantle Slave Province ( Canada): insights from in-situ Hf and U-Pb isotopic analyses of mantle zircons.Earth and Planetary Science Letters, Vol. 240, 3-4, Dec. 15, pp. 621-633.Canada, Northwest TerritoriesJericho, subduction, Archean
DS200612-1411
2006
Heaman, L.M.Tappe, S., Foley, S.F., Jenner, G.A., Heaman, L.M., Kjarsgaard, B.A., Romer,R.L., Stracke, A., Joyce, HoefsGenesis of ultramafic lamprophyres and carbonatites at Aillik Bay, Labrador: a consequence of incipient lithospheric thinning beneath the North Atlantic CratonJournal of Petrology, Vol. 47,7, pp. 1261-1315.Canada, LabradorCarbonatite
DS200712-0284
2006
Heaman, L.M.Eccles, D.R., Creaser, R.A., Heaman, L.M., Sweet, A.R., Ward, J.Geochronology and setting of Late Cretaceous to Paleocene kimberlites in the Buffalo Head Hills, north central Alberta.34th Yellowknife Geoscience Forum, p. 20-21. abstractCanada, AlbertaGeochronology
DS200712-0580
2007
Heaman, L.M.Krauss, C., Chacko, T., Heaman, L.M.Petrological and geochronological investigation of lower crustal xenoliths from the Diavik diamond mine, Slave Craton NWT.Geological Association of Canada, Gac-Mac Yellowknife 2007, May 23-25, Volume 32, 1 pg. abstract p.45.Canada, Northwest TerritoriesDiavik - geochronology
DS200712-0951
2007
Heaman, L.M.Schmidberger, S.S., Simonetti, A., Heaman, L.M., Creaser, R.A., Whieford, S.Lu Hf in-situ Sr and Pb isotope trace element systematics for mantle eclogites from the Diavik diamond mine: evidence for Paleproterozoic subduction..Earth and Planetary Science Letters, Vol. 254, 1-2, Feb. 15, pp. 55-68.Canada, Northwest TerritoriesDeposit - Diavik, geochronology, Slave Craton
DS200712-1000
2006
Heaman, L.M.Smart, K.A., Heaman, L.M., Chacko, T.Preliminary geochemistry and geothermobarometry of mantle eclogite xenoliths from the Jericho kimberlite, Nunavut.34th Yellowknife Geoscience Forum, p. 100. abstractCanada, NunavutJericho - xenoliths
DS200712-1001
2007
Heaman, L.M.Smart, K.A., Heaman, L.M., Chacko, T., Simonetti, A., Kopylova, M.Mineral chemistry and clinopyroxene Sr Pb isotope compositions of mantle eclogite xenoliths from the Jericho kimberlite, Nunavut.Geological Association of Canada, Gac-Mac Yellowknife 2007, May 23-25, Volume 32, 1 pg. abstract p.76.Canada, NunavutMineral chemistry
DS200712-1068
2007
Heaman, L.M.Tappe, S., Foley, S.F., Heaman, L.M., Romer, R.E., Stracke, A., Kjarsgaard, B.A., Jenner, G.A.Interactions between carbonate magmas and MARID metasomes: the case of Diamondiferous aillikites from the Torngat Mountains, Canada.Plates, Plumes, and Paradigms, 1p. abstract p. A1003.Canada, LabradorAillikite, magmatism
DS200812-0059
2008
Heaman, L.M.Aulbach, S., Creaser, R.A.,Heaman, L.M., Simonetti, S.S., Griffin, W.L., Stachel, T.Sulfides, diamonds and eclogites: their link to peridotites and Slave Craton hydrothermal evolution.Goldschmidt Conference 2008, Abstract p.A36.Canada, Northwest TerritoriesDeposit - A 154, geochronology
DS200812-0202
2008
Heaman, L.M.Chamberlain, K.R., Harrison, T.M., Schmitt, A.K., Heaman, L.M., Swapp, S.M., Khudoley, A.K.In situ SIMS microbaddeleyite U Pb dating method for mafic rocks.Goldschmidt Conference 2008, Abstract p.A147.TechnologyGeochronology
DS200812-0311
2008
Heaman, L.M.Eccles, D.R., Creaser, R.A., Heaman, L.M., Ward, J.RbSr and UpB geochronology and setting of the Buffalo Head Hills kimberlite field, northern Alberta.Canadian Journal of Earth Sciences, Vol. 45, 5, pp. 513-529.Canada, AlbertaGeochronology
DS200812-0312
2008
Heaman, L.M.Eccles, D.R., Heaman, L.M., Sweet, A.R.Kimberlite sourced bentonite; its paleoenvironment and implications for the Late Cretaceous K14 kimberlite cluster, northern Alberta.Canadian Journal of Earth Sciences, Vol. 45, 5, pp. 531-547.Canada, AlbertaK 14 project
DS200812-0366
2008
Heaman, L.M.Frei, D., Hutchinson, M.T., Gerdes, A., Heaman, L.M.Common lead corrected U Pb age dating of perovskite by laser ablation - magnetic sectorfield ICP-MS9IKC.com, 3p. extended abstractMantleGeochronology
DS200812-0367
2008
Heaman, L.M.French, J.E., Heaman, L.M., Chacko, T., Srivastava, R.K.1891-1883 Ma southern Bastar-Cuddapah mafic igneous events, India: a newly recognized large igneous province.Precambrian Research, Vol. 160, pp. 308-322.IndiaGeochronology - sill
DS200812-0459
2008
Heaman, L.M.Heaman, L.M.Precambrian Large Igneous Provinces: an overview of geochronology, origins and impact on Earth evolution.Journal of the Geological Society of India, Vol. 72, 1, pp. 15-34.GlobalIgneous rocks
DS200812-0496
2008
Heaman, L.M.Hutchison, M.T., Heaman, L.M.Chemical and physical characteristics of diamond crystals from Garnet Lake, Sarfartoq, West Greenland: an association with carbonatitic magmatism.Canadian Mineralogist, Vol. 46, 4, August pp.Europe, GreenlandDiamond morphology, crystallography
DS200812-1082
2008
Heaman, L.M.Smart, K.A., Heaman, L.M., Chocko, T., Simonetti, A., Kopylova, M., Mah, D., Daniels, D.The origin of diamond rich high MGO eclogite xenoliths from the Jericho kimberlite, Nunavut.Northwest Territories Geoscience Office, p. 56-57. abstractCanada, NunavutDeposit - Jericho
DS200812-1152
2008
Heaman, L.M.Tappe, S., Foley, S.F., Kjarsgaard, B.A, Romer, R.L., Heaman, L.M., Stracke, A., Jenner, G.A.Origin of Diamondiferous Torngat ultramafic lamprophyres and the role of multiple MARID type and carbonatitic vein metasomatized cratonic mantle ...9IKC.com, 3p. extended abstractCanada, Quebec, LabradorGenesis of SiO2 poor potassic melts
DS200812-1153
2008
Heaman, L.M.Tappe, S., Foley, S.F., Kjarsgaard, B.A., Romer, R.L., Heaman, L.M., Stracke, A., Jenner, G.A.Between carbonatite and lamproite - Diamondiferous Torngat ultramafic lamprohyres formed by carbonate fluxed melting of cratonic Marid type metasomes.Geochimica et Cosmochimica Acta, Vol. 72, 13, pp. 3258-3286.Canada, Labrador, QuebecTorngat
DS200812-1154
2008
Heaman, L.M.Tappe, S., Steenfelt, A., Heaman, L.M., Romer, R.J., Simonetti, A., Muehlenbachs, K.The alleged carbonatitic kimberlitic melt continuum: contrary evidence from West Greenland.Goldschmidt Conference 2008, Abstract p.A934.Europe, GreenlandDeposit - Safartoq
DS200812-1330
2008
Heaman, L.M.Zurevinski, S., Heaman, L.M., Creaser, R.A., Strand, P.The newly discovered Churchill kimberlite field, Canada: petrography, mineral chemistry and geochronology.9IKC.com, 3p. extended abstractCanada, NunavutMineralogy
DS200812-1331
2008
Heaman, L.M.Zurevinski, S.E., Heaman, L.M., Creaser, R.A., Strand, P.The Churchill kimberlite field, Nunavut, Canada: petrography, mineral chemistry, and geochronology.Canadian Journal of Earth Sciences, Vol. 45, 8, pp. 1039-1059.Canada, NunavutDeposit - Churchill district
DS200812-1332
2008
Heaman, L.M.Zurevisnki, S., Heaman, L.M., Eichenberg, D.The geochemistry of Diavik kimberlites, Lac de Gras, NWT, Canada.9IKC.com, 3p. extended abstractCanada, Northwest TerritoriesDeposit - Diavik
DS200912-0018
2009
Heaman, L.M.Aulbach, S., Creaser, R.A., Pearson, N.J., Simonetti, S.S., Heaman, L.M., Griffin, W.L., Stachel, T.Sulfide and whole rock Re-Os systematics of eclogite and pyroxenite xenoliths from the Slave Craton, Canada.Earth and Planetary Science Letters, in press available,Canada, Northwest TerritoriesDeposit - Diavik
DS200912-0183
2009
Heaman, L.M.Doornbos, C., Heaman, L.M., Doupe, J.P., England, J., Simonetti, A., Lejeunesse, P.The first integrated use of in situ U Pb geochronology and geochemical analyses to determine long distance transport of glacial erratics from maIn land Canada into western Arctic Archipelgo.Canadian Journal of Earth Sciences, Vol. 46, 2, pp. 101-122.Canada, Melville PeninsulaGeochronology - western Arctic Archipelago
DS200912-0290
2009
Heaman, L.M.Heaman, L.M.The application of U Pb geochronology to mafic, ultramafic and alkaline rocks: an evaluation of three mineral standards.Chemical Geology, Vol. 261, 1-2, pp. 42-51.TechnologyGeochonology
DS200912-0681
2009
Heaman, L.M.Secher, K., Heaman, L.M., Nielsen, T.F.D., Jensen, S.M., Schjeth, F., Creaser, R.A.Timing of kimberlite, carbonatite and ultramafic lamprophyric emplacement in the alkaline province located at 64 - 67 N in southern West Greenland.Lithos, In press available, 21p.Europe, GreenlandGeochronology
DS200912-0698
2009
Heaman, L.M.Smart, K.A., Chacko, T., Heaman, L.M., Simoneti, A.Origin of diamond rich, high MGO eclogite xenoliths from the Jericho kimberlite, Nuanvut.GAC/MAC/AGU Meeting held May 23-27 Toronto, Abstract onlyCanada, NunavutDeposit - Jericho geochemistry
DS200912-0699
2009
Heaman, L.M.Smart, K.A., Chacko, T., Heaman, L.M., Stachel, T., Muehlenbachs, K.Multiple origins of eclogitic diamonds from the Jericho kimberlite, Nunavut.37th. Annual Yellowknife Geoscience Forum, Abstracts p. 58-59.Canada, NunavutDiamond genesis
DS200912-0700
2009
Heaman, L.M.Smart, K.A., Heaman, L.M., Chacko, T.Jericho eclogites of the Slave Craton record multiple subduction related crust formation events.Goldschmidt Conference 2009, p. A1238 Abstract.Canada, Northwest TerritoriesDeposit - Jericho
DS200912-0701
2009
Heaman, L.M.Smart, K.A., Heaman, L.M., Chacko, T., Simonetti, A., Kopylova, M., Mah, D., Daniels, D.The origin of hig MgO diamond eclogites from the Jericho kimberlite, Canada.Earth and Planetary Science Letters, Vol. 284, 3-4, pp. 527-537.Canada, NunavutDeposit - Jericho
DS200912-0745
2009
Heaman, L.M.Tappe, S., Heaman, L.M., Romer, R.L., Steenfelt, A., Simonetti, A., Muehlenbach, K., Stracke, A.Quest for primary carbonatite melts beneath cratons: a West Greenland perspective.Goldschmidt Conference 2009, p. A1314 Abstract.Europe, GreenlandCarbonatite
DS200912-0746
2009
Heaman, L.M.Tappe, S., Heaman, L.M., Smart, K.A., Muehlenbachs, K., Simonetti, A.First results from Greenland eclogite xenoliths: evidence for an ultra depleted peridotitic component within the North Atlantic craton mantle lithosphere.GAC/MAC/AGU Meeting held May 23-27 Toronto, Abstract onlyEurope, GreenlandMelting
DS200912-0747
2009
Heaman, L.M.Tappe, S., Sleenfelt, A., Heaman, L.M., Simonetti, A.The newly discovered Jurassic Tikusaaq carbonatite allikite occurrence, West Greenland, and some remarks on carbonatite kimberlite relationships.Lithos, in press availableEurope, GreenlandPetrology
DS201012-0024
2009
Heaman, L.M.Aulbach, S., Stachel, T., Craeser, R.A., Heaman, L.M., Shirey, S.B., MUehlenbachs, K., Eichenberg, D., HarrisSulphide survival and diamond genesis during formation and evolution of Archean subcontinental lithosphere: a comparison between the Slave and Kaapvaal cratons.Lithos, Vol. 112 S pp. 747-757.Canada, AfricaGeochronology
DS201012-0026
2010
Heaman, L.M.Aulbach, S., Stachel, T., Heaman, L.M., Creaser, R.A., Shirey, S.B.Formation of cratonic subcontinental lithospheric mantle and complementary komatiite from hybrid plume sources.Contributions to Mineralogy and Petrology, In press available, 14p.Canada, Northwest TerritoriesPeridotitic sulphide inclusions in diamonds - SCLM
DS201012-0274
2010
Heaman, L.M.Heaman, L.M., Pearson, D.G.Nature and evolution of the Slave Province subcontinental lithospheric mantle.Canadian Journal of Earth Sciences, Vol. 47, 4, pp. 369-388.Canada, Northwest TerritoriesGeophysics - seismic
DS201012-0430
2010
Heaman, L.M.Lehman, B., Burgess, R., Frei, D., Belyatsky, B., Mainkar, D., Chalapthi Rao, N.V., Heaman, L.M.Diamondiferous kimberlites in central India synchronous with Deccan flood basalts.Earth and Planetary Science Letters, Vol. 290, 1-2, Feb. 15, pp. 142-149.IndiaMineral chemistry
DS201012-0431
2010
Heaman, L.M.Lehmann, B., Burgess, R., Frei, D., Belyatsky, B., Mainkar, D., Chalapthi Rao, N.V., Heaman, L.M.Diamondiferous kimberlites in central India synchronous with Deccan flood basalts.International Dyke Conference Held Feb. 6, India, 1p. AbstractIndiaDharwar and Bundelkhand cratons
DS201012-0778
2010
Heaman, L.M.Tappe, S., Heaman, L.M.Can alkaline magmatism destroy a craton? Lessons learned from the Greenland Labrador diamond province.International Dyke Conference Held Feb. 6, India, 1p. AbstractCanada, Labrador, Europe, GreenlandAlkaline rocks, magmatism
DS201112-0045
2011
Heaman, L.M.Aulbach, S., Stachel, T., Heaman, L.M., Creaser, R.A., Shirey, S.B.Formation of cratonic subcontinental lithospheric mantle and complementary komatiite from hybrid plume sources.Contributions to Mineralogy and Petrology, Vol. 161, 6, pp. 947-960.MantleHotspots
DS201112-0046
2011
Heaman, L.M.Aulbach, S., Stachel, T., Heaman, L.M., Creaser, R.A.,Thomassot, E., Shirey, S.B.C and S transfer in subduction zones: insight from diamonds.Goldschmidt Conference 2011, abstract p.462.Canada, Northwest TerritoriesDiavik, Ekati
DS201112-0499
2011
Heaman, L.M.Kamo, S.L., Corfu, F., Heaman, L.M., Moser, D.E.The Krogh revolution: advances in the measurement of time.Canadian Journal of Earth Sciences, Vol. 48, 2, pp. 87-94.TechnologyGeochronology
DS201112-0974
2011
Heaman, L.M.Smart, K.A., Chacko, T., Stachel, T., Muehlenbachs, K., Stern, R.A., Heaman, L.M.Diamond growth from oxidized carbon sources beneath the Northern Slave Craton, Canada: A delta 13 C-N study of eclogite hosted diamonds from the Jericho kimberlite.Geochimica et Cosmochimica Acta, Vol. 75, pp. 6027-6047.Canada, NunavutJericho - diamond morphology
DS201112-1177
2011
Heaman, L.M.Zurevinski, S.E.,Heaman, L.M., Creaser, R.A.The origin of Triassic/Jurassic kimberlite magmatism, Canada: two mantle sources revealed from the Sr-Nd isotopic composition of groundmass perovskite.Geochemical, Geophysics, Geosystems: G3, Vol. 12, 10.1029Canada, Ontario, Quebec, LabradorCorridor - Timiskaming, Rankin, Attawapiskat, Kirkland
DS201212-0040
2012
Heaman, L.M.Aulbach, S., Stachel, T., Heaman, L.M., Creaser, R.A., Seitz, H.M., Shirey, S.B.Diamond formation in the slab and mantle wedge: examples from the Slave Craton.10th. International Kimberlite Conference Feb. 6-11, Bangalore India, AbstractCanada, Northwest TerritoriesDiamond genesis
DS201212-0265
2012
Heaman, L.M.Grutter, H.S., Gerdes, A., Marko, L., Heaman, L.M.U-Pb geochronology of perovskite and zircon from the Chigicherla kimberlites, Anatapur district, India.10th. International Kimberlite Conference Held Bangalore India Feb. 6-11, Poster abstractIndiaDeposit - Chigicherla
DS201312-0223
2013
Heaman, L.M.Donatti-Filho, J.P., Tappe, S., Oliveira, E.P., Heaman, L.M.Age and origin of Neoproterozoic Brauna kimberlitic melt generation with the metasomatized base of Sao Francisco craton, BrazilChemical Geology, Vol. 353, pp. 19-35.South America, BrazilGeochronology, geochemistry (kimberlites and orangeites)
DS201412-0729
2014
Heaman, L.M.Reiminik, J.R., Chacko, T., Stern, R.A., Heaman, L.M.Earth's earliest evolved crust generated in an Iceland-like setting.Nature Geoscience, Vol. 7, pp. 529-533.Europe, IcelandMagmatism, upwelling mantle rocks
DS201412-0841
2014
Heaman, L.M.Smart, K.A., Chacko, T., Simonetti, A., Sharp, Z.D., Heaman, L.M.A record of Paleoproterozoic subduction preserved in the northern Slave cratonic mantle: Sr-Pb-O isotope and trace element investigations of eclogite xenoliths from the Jericho and Muskox kimberlites.Journal of Petrology, Vol. 55, 3, pp. 549-583.Canada, NunavutDeposit - Jericho, Muskox
DS201504-0201
2015
Heaman, L.M.Heaman, L.M., Pell, J., Grutter, H.S., Creaser, R.A.U-Pb geochronology and Sr/Nd isotope compositions of groundmass perovskite from the newly discovered Jurassic Chidliak kimberlite field, Baffin Island, Canada.Earth and Planetary Science Letters, Vol. 415, April pp. 183-189.Canada, Nunavut, Baffin IslandDeposit - Chidliak
DS201504-0215
2015
Heaman, L.M.Sarkar, C., Heaman, L.M., Pearson, D.G.Duration and periodicity of kimberlite volcanic activity in the Lac de Gras kimberlite field, Canada and some recommendations for kimberlite geochronology.Lithos, Vol. 218-219, pp. 155-166.Canada, Northwest TerritoriesDeposit - Eddie
DS201506-0281
2015
Heaman, L.M.Kent, D.V., Kjarsgaard, B.A., Gee, J.S., Muttoni, G., Heaman, L.M.Tracking the Late Jurassic apparent ( or true) polar shift in U-Pb-dated kimberlites from cratonic North America ( Superior Province of Canada).Geochemistry, Geophysics, Geosystems: G3, Vol. 16, 4, pp. 983-994.Canada, Ontario, TimiskamingDeposit - Peddie
DS201606-1084
2016
Heaman, L.M.Evans, D.A.D., Trindade, R.I.F., Catelani, E.L., D'Agrella-Filho, Heaman, L.M., Oliveira, E.P., Soderlund, U., Ernst, R.E., Smirnovm A.V., Salminen, J.M.Return to Rodinia? Moderate to high paleolatitude of the Sao Francisco/Congo craton at 920 Ma.Geological Society of London Special Publication Supercontinent Cycles through Earth History., Vol. 424, pp. 167-190.South America, BrazilSupercontinents

Abstract: Moderate to high palaeolatitudes recorded in mafic dykes, exposed along the coast of Bahia, Brazil, are partly responsible for some interpretations that the São Francisco/Congo craton was separate from the low-latitude Rodinia supercontinent at about 1050 Ma. We report new palaeomagnetic data that replicate the previous results. However, we obtain substantially younger U-Pb baddeleyite ages from five dykes previously thought to be 1.02- 1.01 Ga according to the 40 Ar/ 39 Ar method. Specifically, the so-called 'A-normal' remanence direction from Salva-dor is dated at 924.2 + 3.8 Ma, within error of the age for the 'C' remanence direction at 921.5 + 4.3 Ma. An 'A-normal' dyke at Ilhéus is dated at 926.1 + 4.6 Ma, and two 'A-normal' dykes at Olivença have indistinguishable ages with best estimate of emplacement at 918.2 + 6.7 Ma. We attribute the palaeomagnetic variance of the 'A-normal' and 'C' directions to lack of averaging of geomagnetic palaeosecular variation in some regions. Our results render previous 40 Ar/ 39 Ar ages from the dykes suspect, leaving late Mesoproterozoic palaeolatitudes of the São Francisco/Congo craton unconstrained. The combined 'A-normal' palaeomagnetic pole from coastal Bahia places the São Francisco/Congo craton in moderate to high palaeolatitudes at c. 920 Ma, allowing various possible positions of that block within Rodinia. Despite more than two decades of intense global research, the configuration of Neoproterozoic supercontinent Rodinia remains enigmatic. Following the first global synthesis by Hoffman (1991), most models include a central location for Laurentia, flanked by 'East' Gondwana-Land cra-tons along its proto-Cordilleran margin and 'West'
DS201610-1903
2016
Heaman, L.M.Reimink, J.R., Davies, J.H.F.L., Chacko, T., Stern, R.A., Heaman, L.M., Sarkar, C., Schaltegger, U., Creaser, R.A., Pearson, D.G.No evidence for Hadean continental crust within Earth's oldest evolved rock unit. (Acasta Gneiss Complex)Nature Geoscience, Vol. 9, pp. 777-780.CanadaHadean crust

Abstract: Due to the acute scarcity of very ancient rocks, the composition of Earth’s embryonic crust during the Hadean eon (>4.0 billion years ago) is a critical unknown in our search to understand how the earliest continents evolved. Whether the Hadean Earth was dominated by mafic-composition crust, similar to today’s oceanic crust1, 2, 3, 4, or included significant amounts of continental crust5, 6, 7, 8 remains an unsolved question that carries major implications for the earliest atmosphere, the origin of life, and the geochemical evolution of the crust-mantle system. Here we present new U-Pb and Hf isotope data on zircons from the only precisely dated Hadean rock unit on Earth—a 4,019.6 ± 1.8?Myr tonalitic gneiss unit in the Acasta Gneiss Complex, Canada. Combined zircon and whole-rock geochemical data from this ancient unit shows no indication of derivation from, or interaction with, older Hadean continental crust. Instead, the data provide the first direct evidence that the oldest known evolved crust on Earth was generated from an older ultramafic or mafic reservoir that probably surfaced the early Earth.
DS201612-2329
2016
Heaman, L.M.Reimink, J.R., Davies, J.H.F.L., Chacko, T., Stern, R.A., Heaman, L.M., Sarkar, C., Schaltegger, U., Creaser, R.A., Pearson, D.G.No evidence for Hadean continental crust within Earth's oldest evolved rock unit.Nature Geoscience, Vol. 9, pp. 777-780.CanadaAcasta Gneiss

Abstract: Due to the acute scarcity of very ancient rocks, the composition of Earth’s embryonic crust during the Hadean eon (>4.0 billion years ago) is a critical unknown in our search to understand how the earliest continents evolved. Whether the Hadean Earth was dominated by mafic-composition crust, similar to today’s oceanic crust1, 2, 3, 4, or included significant amounts of continental crust5, 6, 7, 8 remains an unsolved question that carries major implications for the earliest atmosphere, the origin of life, and the geochemical evolution of the crust-mantle system. Here we present new U-Pb and Hf isotope data on zircons from the only precisely dated Hadean rock unit on Earth—a 4,019.6 ± 1.8?Myr tonalitic gneiss unit in the Acasta Gneiss Complex, Canada. Combined zircon and whole-rock geochemical data from this ancient unit shows no indication of derivation from, or interaction with, older Hadean continental crust. Instead, the data provide the first direct evidence that the oldest known evolved crust on Earth was generated from an older ultramafic or mafic reservoir that probably surfaced the early Earth.
DS201703-0396
2017
Heaman, L.M.Almeida, V.V., Janasi, V.A., Heaman, L.M., Shaulis, B.J., Hollanda, M.H.B.M., Renne, P.R.Contemporaneous alkaline and tholeiitic magmatism in the Ponta Grossa Arch, Parana Etendeka magmatic province: constraints from U-Pb zircon baddeleyite and 40Ar/39Ar phlogopite dating of the Jose Fernandes gabbro and mafic dykes.Journal of Volcanology and Geothermal Research, in press available 11p.South America, BrazilAlkaline rocks

Abstract: We report the first high-precision ID-TIMS U-Pb baddeleyite/zircon and 40Ar/39Ar step-heating phlogopite age data for diabase and lamprophyre dykes and a mafic intrusion (José Fernandes Gabbro) located within the Ponta Grossa Arch, Brazil, in order to constrain the temporal evolution between Early Cretaceous tholeiitic and alkaline magmatism of the Paraná-Etendeka Magmatic Province. U-Pb dates from chemically abraded zircon data yielded the best estimate for the emplacement ages of a high Ti-P-Sr basaltic dyke (133.9 ± 0.2 Ma), a dyke with basaltic andesite composition (133.4 ± 0.2 Ma) and the José Fernandes Gabbro (134.5 ± 0.1 Ma). A 40Ar/39Ar phlogopite step-heating age of 133.7 ± 0.1 Ma from a lamprophyre dyke is identical within error to the U-Pb age of the diabase dykes, indicating that tholeiitic and alkaline magmatism were coeval in the Ponta Grossa Arch. Although nearly all analysed fractions are concordant and show low analytical uncertainties (± 0.3-0.9 Ma for baddeleyite; 0.1-0.4 Ma for zircon; 2s), Pb loss is observed in all baddeleyite fractions and in some initial zircon fractions not submitted to the most extreme chemical abrasion treatment. The resulting age spread may reflect intense and continued magmatic activity in the Ponta Grossa Arch.
DS201709-2016
2017
Heaman, L.M.Kjarsgaard, B.A., Heaman, L.M., Sarkar, C., Pearson, D.G.The North American mid-Cretaceous kimberlite corridor: wet, edge-driven decompression melting of an OIB-type deep mantle source.Geochemistry, Geophysics, Geosystems: G3, Vol. 18, 7, pp. 2727-2747.Canada, Somerset Island, Saskatchewan, United States, Kansasmagmatism, convection, diamond genesis

Abstract: Thirty new high-precision U-Pb perovskite and zircon ages from kimberlites in central North America delineate a corridor of mid-Cretaceous (115–92 Ma) magmatism that extends ~4000 km from Somerset Island in Arctic Canada through central Saskatchewan to Kansas, USA. The least contaminated whole rock Sr, Nd, and Hf isotopic data, coupled with Sr isotopic data from groundmass perovskite indicates an exceptionally limited range in Sr-Nd-Hf isotopic compositions, clustering at the low ?Nd end of the OIB array. These isotopic compositions are distinct from other studied North American kimberlites and point to a sublithospheric source region. This mid-Cretaceous kimberlite magmatism cannot be related to mantle plumes associated with the African or Pacific large low-shear wave velocity province (LLSVP). All three kimberlite fields are adjacent to strongly attenuated lithosphere at the edge of the North American craton. This facilitated edge-driven convection, a top-down driven processes that caused decompression melting of the transition zone or overlying asthenosphere. The inversion of ringwoodite and/or wadsleyite and release of H2O, with subsequent metasomatism and synchronous wet partial melting generates a hot CO2 and H2O-rich protokimberlite melt. Emplacement in the crust is controlled by local lithospheric factors; all three kimberlite fields have mid-Cretaceous age, reactivated major deep-seated structures that facilitated kimberlite melt transit through the lithosphere.
DS201809-2082
2018
Heaman, L.M.Sarkar, C., Kjarsgaard, B.A., Pearson, D.G., Heaman, L.M., Locock, A.J., Armstrong, J.P.Geochronology, classification and mantle source characteristics of kimberlites and related rocks from the Rae craton, Melville Peninsula, Nunavut, Canada.Mineralogy and Petrology, doi.org/10.1007/ s00710-018-0632-5 20p.Canada, Nunavut, Melville Peninsuladeposit - Pelly Bay, Darby, Aviat, Qilalugaq

Abstract: Detailed geochronology along with petrographic, mineralogical and geochemical studies have been conducted on recently found diamond-bearing kimberlitic and related rocks in the Rae Craton at Aviat and Qilalugaq, Melville Peninsula, north-east Canada. Magmatic rocks from the Aviat pipes have geochemical (both bulk rock and isotopic) and mineralogical signatures (e.g., core to rim Al and Ba enrichment in phlogopite) similar to Group I kimberlite. In contrast, Aviat intrusive sheets are similar to ‘micaceous’ Group II kimberlite (orangeite) in their geochemical and mineralogical characteristics (e.g., phlogopite and spinel compositions, highly enriched Sr isotopic signature). Qilalugaq rocks with the least crustal contamination have geochemical and mineralogical signatures [e.g., high SiO2, Al2O3 and H2O; low TiO2 and CO2; less fractionated REE (rare earth elements), presence of primary clinopyroxene, phlogopite and spinel compositions] that are similar to features displayed by olivine lamproites from Argyle, Ellendale and West Greenland. The Naujaat dykes, in the vicinity of Qilalugaq, are highly altered due to extensive silicification and carbonation. However, their bulk rock geochemical signature and phlogopite chemistry are similar to Group I kimberlite. U-Pb perovskite geochronology reveals that Aviat pipes and all rocks from Qilalugaq have an early Cambrian emplacement age (540-530 Ma), with the Aviat sheets being ~30 Ma younger. This volatile-rich potassic ultramafic magmatism probably formed by varying degrees of involvement of asthenospheric and lithospherically derived melts. The spectrum of ages and compositions are similar to equivalent magmatic rocks observed from the nearby north-eastern North America and Western Greenland. The ultimate trigger for this magmatism could be linked to Neoproterozoic continental rifting during the opening of the Iapetus Ocean and breakup of the Rodinia supercontinent.
DS201810-2370
2018
Heaman, L.M.Ranger, I.M., Heaman, L.M., Pearson, D.G., Muntener, C., Zhuk, V.Punctuated, long lived emplacement history of the Renard 2 kimberlite, Canada, revealed by new high precision U-Pb groundmass perovskite dating. IF-TIMSMineralogy and Petrology, doi.org/101007/ s00710-018-0629-0 13p.Canada, Quebecdeposit - Renard

Abstract: Kimberlites are rare volatile-rich ultramafic magmas thought to erupt in short periods of time (<1 Myr) but there is a growing body of evidence that the emplacement history of a kimberlite can be significantly more protracted. In this study we report a detailed geochronology investigation of a single kimberlite pipe from the Renard cluster in north-central Québec. Ten new high precision ID-TIMS (isotope dilution - thermal ionization mass spectrometry) U-Pb groundmass perovskite dates from the main pipe-infilling kimberlites and several small hypabyssal kimberlites from the Renard 2 pipe indicate kimberlite magmatism lasted at least ~20 Myr. Two samples of the main pipe-infilling kimberlites yield identical weighted mean 206Pb/238U perovskite dates with a composite date of 643.8?±?1.0 Myr, interpreted to be the best estimate for main pipe emplacement. In contrast, six hypabyssal kimberlite samples yielded a range of weighted mean 206Pb/238U perovskite dates between ~652-632 Myr. Multiple dates determined from these early-, syn- and late-stage small hypabyssal kimberlites in the Renard 2 pipe demonstrate this rock type (commonly used to date kimberlites) help to constrain the duration of kimberlite intrusion history within a pipe but do not necessarily reliably record the emplacement age of the main diatreme in the Renard cluster. Our results provide the first robust geochronological data on a single kimberlite that confirms the field relationships initially observed by Wagner (1914) and Clement (1982); the presence of antecedent (diatreme precursor) intrusions, contemporaneous (syn-diatreme) intrusions, and consequent (post-diatreme) cross-cutting intrusions. The results of this detailed U-Pb geochronology study indicate a single kimberlite pipe can record millions of years of magmatism, much longer than previously thought from the classical viewpoint of a rapid and short-duration emplacement history.
DS201812-2776
2019
Heaman, L.M.Aulbach, S., Heaman, L.M., Jacob, D.E., Viljoen, K.S.Ages and sources of mantle eclogites: ID-TIMS and in situ MC-ICPMS Pb-Sr isotope sytematics of clinopyroxene.Chemical Geology, Vol. 503, pp. 15-28.Mantleeclogite

Abstract: Strontium and Pb isotopic compositions of clinopyroxene (cpx) in selected samples from three well-characterised eclogite suites with oceanic crustal protoliths (Lace/Kaapvaal craton, Orapa/Zimbabwe craton and Koidu/West African craton) were acquired by high-precision isotope dilution thermal ionisation mass spectrometry (ID-TIMS) and in situ multicollector-laser ablation-inductively-coupled plasma mass spectrometry (MC-LA-ICPMS). The aims of this study are twofold: (1) assess their utility to obtain formation or resetting age constraints and identify elemental signatures that enhance the chances of successful age dating, and (2) to confirm the veracity and utility of results obtained by novel MC-LA-ICPMS techniques. Strontium-Pb isotope systematics of eclogitic cpx measured in this study are decoupled and may reflect addition of unsupported radiogenic Sr during seawater alteration or interaction with oceanic sediments in subduction mélanges, and/or disturbance due to mantle metasomatism, to which the more incompatible Pb is more susceptible. Despite a complex history, subsets of samples yield meaningful model dates. Clinopyroxene fractions from Lace with high Pb contents (36?ppm), unradiogenic Pb isotopic compositions (206Pb/204Pb?=?13.5713.52) and low 238U/204Pb (1.01.5) give single-stage model Pb dates of 2.902.84?Ga. In contrast, samples from Orapa plot to the right of the Geochron and do not yield meaningful Pb model ages. However, these data do define secondary isochrons that can be modelled to yield minimum age constraints on major events affecting the cratonic lithosphere. Within the uncertainties, the resultant 2.18?±?0.45?Ga age obtained for Koidu eclogites reflect disturbance of the Pb isotope system due to subduction beneath the craton linked to the Eburnean orogeny, while they retained their unradiogenic 87Sr/86Sr (0.7016). Similarly, the age for samples from Orapa (2.20?±?0.54?Ga) is interpreted as an overprint age related to Palaeoproterozoic accretion at the western craton margin. Gabbroic eclogites (Eu/Eu*?>?1) with plagioclase-rich protoliths having low time-integrated Rb/Sr and U/Pb retain the least radiogenic Sr and, in part, Pb. High model µ (9.0 to 9.1) for several eclogites from Lace with elevated LREE, Th and Pb abundances reflects ca. 3.0?Ga addition of a sedimentary component, possibly derived from reworking of a high-µ basaltic protocrust, as observed on other cratons. We suggest that sample targeting can be usefully guided by fast-throughput in situ LA-ICPMS techniques, which largely yield results identical to ID-TIMS, albeit at lower precision, and which can further help identify kimberlite contamination in the mineral separates used for solution work.
DS201812-2777
2018
Heaman, L.M.Aulbach, S., Heaman, L.M., Stachel, T.Diavik deposit: The diamondiferous mantle root beneath the central Slave craton.Society of Economic Geology Geoscience and Exploration of the Argyle, Bunder, Diavik, and Murowa Diamond Deposits, Special Publication no. 20, pp.319-342.Canada, Northwest Territoriesdeposit - Diavik
DS201902-0257
2019
Heaman, L.M.Aulbach, S., Heaman, L.M., Jacob, D., Viljoen, K.S.Ages and sources of mantle eclogites: ID-TIMS and in situ MC-ICPMS Pb-Sr isotope systematics of clinopyroxene.Chemical Geology, Vol. 503, pp. 15-28.Africa, South Africa, Zimbabwe, Sierra Leonedeposit - Lace, Orapa, Koidu

Abstract: Strontium and Pb isotopic compositions of clinopyroxene (cpx) in selected samples from three well-characterised eclogite suites with oceanic crustal protoliths (Lace/Kaapvaal craton, Orapa/Zimbabwe craton and Koidu/West African craton) were acquired by high-precision isotope dilution thermal ionisation mass spectrometry (ID-TIMS) and in situ multicollector-laser ablation-inductively-coupled plasma mass spectrometry (MC-LA-ICPMS). The aims of this study are twofold: (1) assess their utility to obtain formation or resetting age constraints and identify elemental signatures that enhance the chances of successful age dating, and (2) to confirm the veracity and utility of results obtained by novel MC-LA-ICPMS techniques. Strontium-Pb isotope systematics of eclogitic cpx measured in this study are decoupled and may reflect addition of unsupported radiogenic Sr during seawater alteration or interaction with oceanic sediments in subduction mélanges, and/or disturbance due to mantle metasomatism, to which the more incompatible Pb is more susceptible. Despite a complex history, subsets of samples yield meaningful model dates. Clinopyroxene fractions from Lace with high Pb contents (3-6?ppm), unradiogenic Pb isotopic compositions (206Pb/204Pb?=?13.57-13.52) and low 238U/204Pb (1.0-1.5) give single-stage model Pb dates of 2.90-2.84?Ga. In contrast, samples from Orapa plot to the right of the Geochron and do not yield meaningful Pb model ages. However, these data do define secondary isochrons that can be modelled to yield minimum age constraints on major events affecting the cratonic lithosphere. Within the uncertainties, the resultant 2.18?±?0.45?Ga age obtained for Koidu eclogites reflect disturbance of the Pb isotope system due to subduction beneath the craton linked to the Eburnean orogeny, while they retained their unradiogenic 87Sr/86Sr (0.7016). Similarly, the age for samples from Orapa (2.20?±?0.54?Ga) is interpreted as an overprint age related to Palaeoproterozoic accretion at the western craton margin. Gabbroic eclogites (Eu/Eu*?>?1) with plagioclase-rich protoliths having low time-integrated Rb/Sr and U/Pb retain the least radiogenic Sr and, in part, Pb. High model µ (9.0 to 9.1) for several eclogites from Lace with elevated LREE, Th and Pb abundances reflects ca. 3.0?Ga addition of a sedimentary component, possibly derived from reworking of a high-µ basaltic protocrust, as observed on other cratons. We suggest that sample targeting can be usefully guided by fast-throughput in situ LA-ICPMS techniques, which largely yield results identical to ID-TIMS, albeit at lower precision, and which can further help identify kimberlite contamination in the mineral separates used for solution work.
DS201905-1018
2019
Heaman, L.M.Bohm, C.O., Hartlaub, R.P., Heaman, L.M., Cates, N., Guitreau, M., Bourdon, B., Roth, A.S.G., Mojzsis, S.J., Blichert-Toft, J.The Assean Lake Complex: ancient crust at the northwestern margin of the Superior Craton, Manitoba, Canada.Earths Oldest Rocks, researchgate.com Chapter 28, 20p. Pdf availableCanada, Manitobacraton

Abstract: This chapter describes the Assean Lake Complex (ALC) at ancient crust at the Northwestern margin of the Superior Craton, Manitoba, and Canada. An initial tectonic model for the Assean Lake area indicated that a regionally extensive high-strain zone running through the lake marks the suture between Archean high-grade crustal terranes of the Superior Craton to the southeast and Paleoproterozoic rocks of the Trans-Hudson Orogen to the northwest. Detailed geologic remapping combined with isotopic and geochemical studies led to a re-interpretation of the crust immediately north of the Assean Lake high-strain zone as Mesoarchean. The study area straddles the boundary between the Archean Superior Craton and the ca.1.90-1.84 Ga arc and marginal basin rocks of the Trans-Hudson Orogen, which represent the remains of ca. 1.83-1.76 Ga ocean closure and orogeny. It is indicated that the gneisses of the Split Lake Block consist primarily of meta-igneous protoliths of gabbroic to granitic composition. Tonalite and granodiorite are the most volumetrically dominant, but an anorthosite dome is also present in the northeast. Mapping, isotopic, and age data combined with high-resolution aero-magnetic data indicate that the Mesoarchean ALC is a crustal slice up to 10 km wide, and has a strike length of at least 50 km.
DS202002-0161
2019
Heaman, L.M.Aulbach, S., Woodland, A.B., Stern, R.A., Vasilyev, P., Heaman, L.M., Viljoen, K.S.Evidence for a dominantly reducing Archaean ambient mantle from two redox proxies, and low oxygen fugacity of deeply subducted oceanic crust.Nature Research Scientific Reports, https://doi.org/10.1038/ s41598-019-55743-1 11p. PdfMantlemelting, redox

Abstract: Privacy Policy. You can manage your preferences in 'Manage Cookies'. Oxygen fugacity (fO2) is an intensive variable implicated in a range of processes that have shaped the Earth system, but there is controversy on the timing and rate of oxidation of the uppermost convecting mantle to its present fO2 around the fayalite-magnetite-quartz oxygen buffer. Here, we report Fe3+/SFe and ƒf2 for ancient eclogite xenoliths with oceanic crustal protoliths that sampled the coeval ambient convecting mantle. Using new and published data, we demonstrate that in these eclogites, two redox proxies, V/Sc and Fe3+/SFe, behave sympathetically, despite different responses of their protoliths to differentiation and post-formation degassing, seawater alteration, devolatilisation and partial melting, testifying to an unexpected robustness of Fe3+/SFe. Therefore, these processes, while causing significant scatter, did not completely obliterate the underlying convecting mantle signal. Considering only unmetasomatised samples with non-cumulate and little-differentiated protoliths, V/Sc and Fe3+/SFe in two Archaean eclogite suites are significantly lower than those of modern mid-ocean ridge basalts (MORB), while a third suite has ratios similar to modern MORB, indicating redox heterogeneity. Another major finding is the predominantly low though variable estimated fO2 of eclogite at mantle depths, which does not permit stabilisation of CO2-dominated fluids or pure carbonatite melts. Conversely, low-fO2 eclogite may have caused efficient reduction of CO2 in fluids and melts generated in other portions of ancient subducting slabs, consistent with eclogitic diamond formation ages, the disproportionate frequency of eclogitic diamonds relative to the subordinate abundance of eclogite in the mantle lithosphere and the general absence of carbonate in mantle eclogite. This indicates carbon recycling at least to depths of diamond stability and may have represented a significant pathway for carbon ingassing through time.
DS202002-0167
2019
Heaman, L.M.Bohm, C.O., Hartlaub, R.P., Heaman, L.M., Cates, N., Guitreau, M., Bourdon, B., Roth, A.S.G., Mojzsis, S.J., Blichert-Toft, J.The Assean Lake Complex: ancient crust at the northwestern margin of the Superior craton, Manitoba, Canada. ( not specific to diamonds)Earth's Oldest Rocks, Chapter 28, 20p. Pdf.Canada, Manitobacraton
DS202007-1129
2020
Heaman, L.M.Chen, Y., Gu, Y/.J., Heaman, L.M., Wu, L., Saygin, E., Hung, S-H.Reconciling seismic structures and Late Cretaceous kimberlite magmatism in northern Alberta, Canada.Geology, Vol. 48, in press available, 5 p. pdfCanada, Albertadeposit - Birch Mountain, Mountain Lake

Abstract: The Late Cretaceous kimberlites in northern Alberta, Canada, intruded into the Paleoproterozoic crust and represent a nonconventional setting for the discovery of diamonds. Here, we examined the origin of kimberlite magmatism using a multidisciplinary approach. A new teleseismic survey reveals a low-velocity (-1%) corridor that connects two deep-rooted (>200 km) quasi-cylindrical anomalies underneath the Birch Mountains and Mountain Lake kimberlite fields. The radiometric data, including a new U-Pb perovskite age of 90.3 ± 2.6 Ma for the Mountain Lake intrusion, indicate a northeast-trending age progression in kimberlite magmatism, consistent with the (local) plate motion rate of North America constrained by global plate reconstructions. Taken together, these observations favor a deep stationary (relative to the lower mantle) source region for kimberlitic melt generation. Two competing models, mantle plume and slab subduction, can satisfy kinematic constraints and explain the exhumation of ultradeep diamonds. The plume hypothesis is less favorable due to the apparent age discrepancy between the oldest kimberlites (ca. 90 Ma) and the plume event (ca. 110 Ma). Alternatively, magma generation may have been facilitated by decompression of hydrous phases (e.g., wadsleyite and ringwoodite) within the mantle transition zone in response to thermal perturbations by a cold slab. The three-dimensional lithospheric structures largely controlled melt migration and intrusion processes during the Late Cretaceous kimberlite magmatism in northern Alberta.
DS202008-1368
2019
Heaman, L.M.Aulbach, S., Woodand, A.B., Stern, R.A., Vasileyev, P., Heaman, L.M., Viljoen, K.S.Evidence for a dominantly reducing Archean ambient mantle from two redox proxies, and low oxygen fugacity of deeply subducted oceanic crust. Nature Research Scientific Reports, Vol. 9:20190 doir.org/10.38 /s41598-019-55743-1, 11p. PdfMantleeclogite

Abstract: Oxygen fugacity (ƒO2) is an intensive variable implicated in a range of processes that have shaped the Earth system, but there is controversy on the timing and rate of oxidation of the uppermost convecting mantle to its present ƒO2 around the fayalite-magnetite-quartz oxygen buffer. Here, we report Fe3+/SFe and ƒO2 for ancient eclogite xenoliths with oceanic crustal protoliths that sampled the coeval ambient convecting mantle. Using new and published data, we demonstrate that in these eclogites, two redox proxies, V/Sc and Fe3+/SFe, behave sympathetically, despite different responses of their protoliths to differentiation and post-formation degassing, seawater alteration, devolatilisation and partial melting, testifying to an unexpected robustness of Fe3+/SFe. Therefore, these processes, while causing significant scatter, did not completely obliterate the underlying convecting mantle signal. Considering only unmetasomatised samples with non-cumulate and little-differentiated protoliths, V/Sc and Fe3+/SFe in two Archaean eclogite suites are significantly lower than those of modern mid-ocean ridge basalts (MORB), while a third suite has ratios similar to modern MORB, indicating redox heterogeneity. Another major finding is the predominantly low though variable estimated ƒO2 of eclogite at mantle depths, which does not permit stabilisation of CO2-dominated fluids or pure carbonatite melts. Conversely, low-ƒO2 eclogite may have caused efficient reduction of CO2 in fluids and melts generated in other portions of ancient subducting slabs, consistent with eclogitic diamond formation ages, the disproportionate frequency of eclogitic diamonds relative to the subordinate abundance of eclogite in the mantle lithosphere and the general absence of carbonate in mantle eclogite. This indicates carbon recycling at least to depths of diamond stability and may have represented a significant pathway for carbon ingassing through time.
DS1999-0365
1999
Heaman ...Kjarsgaard, B.J., Leckie, D.A., McNeil, D., Heaman ...Cretaceous kimberlite chaos? Fort a la Corne revisited and resolved8th. Calgary Mining forum, 2p. abstractSaskatchewanKimberlite, Deposit - Fort a la Corne
DS200712-1069
2007
Heamna, L.M.Tappe, S., Foley, S.F., Stracke, A., Romer, R.L., Kjarsgaard, B.A., Heamna, L.M., Joyce, N.Craton reactivation on the Labrador sea margins 40Ar 39Ar age and Sr Nd Hf Pb isotope constraints from alkaline and carbonatite intrusives.Earth and Planetary Science Letters, Vol. 256, 3-4, pp. 433-454.CanadaCarbonatite
DS1991-0693
1991
Hean, S.Hean, S.Environment and the economyThe Canadian Mining and Metallurgical Bulletin (CIM Bulletin) , Special Feature on environment, Vol. 84, No. 952, Augustpp. 52-54CanadaLegal -environment, Economics
DS200612-0363
2006
Heaney, P.JEaton-Magana, S., Post, J.E., Freitas, J.A., Klein, P.B., Walters, R.A., Heaney, P.J, Butler, J.E.Luminescence of the Hope diamond and other blue diamonds.GIA Gemological Research Conference abstract volume, Held August 26-27, p. 32. 1/2p.TechnologySpectroscopy
DS1998-0332
1998
Heaney, P.J.De, S., Heaney, P.J., Vincenzi, E.P., Hargraves, R.B.Microstructural comparison between natural polycrystalline diamond -carbonado and artificial..Ima 17th. Abstract Vol., p. A16. poster abstractBrazil, Central African RepublicCarbonado, Diamond synthesis
DS2001-0239
2001
Heaney, P.J.De, S., Heaney, P.J., Wang, J.Chemical heterogeneity in carbonado, an enigmatic polycrystalline diamondEarth and Plan. Sci. Letters, Vol. 185, No. 3-4, Feb. 28, pp. 315-30.Central African RepublicGeochemistry - carbonado, Cathodluminescence
DS2001-0465
2001
Heaney, P.J.Heaney, P.J., Vicenzi, E.P., Giannuzzi, L., Livi, K.J.T.Focused ion beam milling: a method of site specific sample extraction for microanalysis of Earth materials.American Mineralogist, Vol. 86, pp. 1094-99.GlobalMicroanalysis - TEM, FIB
DS2002-0690
2002
Heaney, P.J.Heaney, P.J., Vicenzi, E.P., Subarnakha, De.Microstructural distinctions between two polycrystalline diamond variatiesEos, American Geophysical Union, Spring Abstract Volume, Vol.83,19, 1p.Brazil, Central African RepublicDiamond - morphology, carbonado
DS2002-1664
2002
Heaney, P.J.Vicenzi, E.P., Heaney, P.J., Snyder, K.Radiation halos, a rare microstructure in diamonds from the Central African RepublicEos, American Geophysical Union, Spring Abstract Volume, Vol.83,19, 1p.Central African RepublicDiamond - morphology, carbonado
DS200412-0433
2004
Heaney, P.J.De, S., Heaney, P.J., Fei, Y., Vicenzi, E.P.Microstructural study of synthetic sintered diamond and comparsion with carbonado, a natural polycrstalline diamond.American Mineralogist, Vol. 89, 2-3, Feb. Mar. pp. 439-46.TechnologyDiamond morphology
DS200512-0412
2005
Heaney, P.J.Heaney, P.J., Vicenzi, E.P., De, S.Strange diamonds: the mysterious origins of carbonado and framesite.Elements, Vol. 1, 2, March pp. 85-90.South America, Brazilframesite, polycrystalline, mineralogy
DS200712-0283
2006
Heaney, P.J.Eaton-Magana, S., Post, J.E., Walters, R.A., Heaney, P.J., Butler, J.E.Fluoresence of fancy color natural diamonds.Gems & Gemology, 4th International Symposium abstracts, Fall 2006, p.131-2. abstract onlyTechnologyDiamond colour - UV radiation
DS200812-0309
2008
Heaney, P.J.Eaton-Magana, S., Post, J.E., Heaney, P.J., Frietas, J., Klein, P., Walters, R., Butler, J.E.Using phosphorescence as a fingerprint for the Hope and other blue diamonds.Geology, Vol. 36, 1, pp.TechnologyDiamond morphology
DS200812-0310
2007
Heaney, P.J.Eaton-Magana, S., Post, J.E., Heaney, P.J., Walters, R.A., Breeding, C.M., Butler, J.E.Fluorescence spectra of colored diamonds using a rapid, mobile spectrometer.Gems & Gemology, Vol. 43, 4, Winter pp. 332-351.TechnologyType 1 a diamonds
DS1998-0601
1998
Heaney, R.B.Heaney, R.B., Taylor, P.T.Microstructural observations of polycrystalline diamond: a contribution To the carbonado conundrum.Earth and Planetary Science Letters, Vol. 164, No.3-4, Dec.30, pp. 421-42.GlobalDiamond morphology, Carbonado
DS201112-0695
2011
Heap, M.J.Mollo, S., Vinciguerra, S., Lezzi, G., Iarocci, A., Scarlato, P., Heap, M.J., Dingwell, D.B.Volcanic edifice weakening via devolatization reactions.Geophysical Journal International, In press, availableMantleVolcanism - not specific to diamonds
DS201810-2375
2018
Heap, M.J.Ryan, A.G., Russell, J.K., Heap, M.J.Rapid solid state sintering in volcanic systems.American Mineralogist, MS #6714, 19p.Mantlevolcanism
DS1998-1050
1998
Hearherington, A.Mueller, P., Hearherington, A.The Wyoming Province and its place in the evolution of Precambrian NorthAmerica.Geological Society of America (GSA) Annual Meeting, abstract. only, p.A46.WyomingTectonic, Lithoprobe
DS2002-0691
2002
Hearld TribuneHearld TribuneGemesis ready to shine. Diamond chambers could produce rough gems by Friday using a process invented in Russia and fine tuned in Sarasota ( USA).Hearld Tribune, Nov. 21, 2p.United StatesNews item
DS1988-0136
1988
Hearm, B.C.Collerson, K., Hearm, B.C., Macdonald, R.A., Upton, B.F., Park, J.G.Granulite xenoliths from the Bearpaw Mountains,Montana: constraints on the character and evolution of lower continental crustTerra Cognita, Eclogite conference, Vol. 8, No. 3, Summer, p. 270. AbstractMontanaXenoliths, Bearpaw Mountains
DS1987-0181
1987
Hearn, B.C.Eggler, D.H., Dudas, F.O., Hearn, B.C., McCallum, M.E., McGee, E.S.Lithosphere of the continental United States: Xenoliths in Kimberlites and other alkaline magmasin: Nixon, P.H. ed. Mantle xenoliths, J. Wiley, pp. 41-58United States, Montana, Colorado Wyoming, Kansas, Arkansas, MichiganTennessee, Kentucky, Pennsylvania, New York, Wyoming, Arizon
DS1992-0970
1992
Hearn, B.C.Macdonald, R., Upton, B.G.J., Collerson, K.D., Hearn, B.C.Potassic mafic lavas of the Bearpaw Mountains, Montana-mineralogy, chemistry and origin ( review)Journal of Petrology, Vol. 33, No. 2, April pp. 305-346MontanaPotassic magmatism, Bearpaw Mountains
DS201412-0179
2014
Hearn, B.C.Delpit, S., Ross, P-S., Hearn, B.C.Deep bedded ultramafic diatremes in the Missouri River breaks volcanic field, Montana, USA: 1 km of syn-eruptive subsidence.Bulletin of Volcanology, Vol. 76, p. 832-United States, MontanaMissouri Breaks diatreme
DS201504-0192
2014
Hearn, B.C.Delpit, S., Ross, P-S., Hearn, B.C.Deep bedded ultramafic diatremes in the Missouri River Breaks volcanic field, Montana, USA.Bulletin of Volcanology, Vol. 76, p. 832-United States, MontanaDiatreme
DS1982-0423
1982
Hearn, B.C. JR.Mcgee, E.S., Hearn, B.C. JR.Inclusions in the Lake Ellen Kimberlite, Northern Michigan, united States (us)Proceedings of Third International Kimberlite Conference, TERRA COGNITA, ABSTRACT VOLUME., Vol. 2, No. 3, P. 220, (abstract.).Michigan, United States, Great LakesKimberlite, Geophysics, Magnetic, Groundmag
DS1986-0353
1986
Hearn, B.C. Jr.Hearn, B.C. Jr.Alkalic ultramafic magmas in north central Montana, USA: genetic connections of alnoite, kimberlite and carbonatite #1Proceedings of the Fourth International Kimberlite Conference, Held Perth, Australia, Geological, No. 16, pp. 33-35MontanaCarbonatite, Alkaline rocks
DS1986-0553
1986
Hearn, B.C. Jr.McGee, E.S., Hearn, B.C. Jr.Carbonates xenoliths from the Macdougal Springs mica peridotitediatreme:inferences for upper mantle conditions in north central MontanaProceedings of the Fourth International Kimberlite Conference, Held Perth, Australia, No. 16, pp. 291-293MontanaBlank
DS1998-0602
1998
Hearn, B.C. Jr.Hearn, B.C. Jr.Peridotite xenoliths from Porcupine Dome, Montana: depleted subcontinental lithosphere samples ...7th International Kimberlite Conference Abstract, pp. 328-30.MontanaMagma - olivine phlogopite carbonate, Deposit - Porcupine Dome
DS201608-1438
2015
Hearn, B.C. Jr.Schulze, D.J., Hearn, B.C. Jr.Mantle xenocrysts from the Masontown, Pennsylvania kimberlite: an ordinary mantle with Si-enriched spinel.The Canadian Mineralogist, Vol. 53, pp. 767-773.United States, PennsylvaniaDike - Monongahela River

Abstract: A hypabyssal kimberlite dike in southwestern Pennsylvania (USA), emplaced through Proterozoic basement and Phanerozic cover, contains a xenocryst and xenolith assemblage typical of material sampled within the subcontinental lithosphere, including xenocrysts of Cr-rich pyrope, magnesiochromite, Cr-rich diopside, and peridotite xenoliths. Temperatures and depths of equilibration of the clinopyroxene (840 ºC and 130 km to 1350 ºC and 170 km) indicate some sampling in the field of diamond stability. Diamonds have not been reported, however, and the chemistry of the garnet (lherzolite, Cr-poor megacryst, and Group II eclogite) and spinel (<56.0 wt.% Cr2O3) are consistent with diamond absence and the off-craton tectonic setting of the kimberlite. An unusual feature of this suite is that, unlike most mantle xenolith/xenocryst spinel, some of those from Masontown have an unusually high silica content (to 0.59 wt.% SiO2). The significance of the high silica content is unclear, but may be related to an ultrahigh-pressure precursor chromite polymorph with a calcium ferrite structure, which can accommodate Si in solid solution.
DS1983-0299
1983
Hearn, B.C.JRHearn, B.C.JR, Mcgee, E.S.Garnets in Montana Diatremes; a Key to Prospecting for Kimberlites.United States Geological Survey (USGS) Bulletin., No. 1604, 33P.United States, Montana, Rocky MountainsMineral Chemistry, Inclusions, Microprobe, Analyses
DS1960-0839
1967
Hearn, B.C.JR.Hearn, B.C.JR.Montana Diatremes With Kimberlitic AffinitiesEos, Vol. 48, No. 1, P. 256, (abstract.).United States, Montana, Rocky MountainsDiatreme
DS1960-0961
1968
Hearn, B.C.JR.Hearn, B.C.JR.Diatremes with Kimberlitic Affinities in North Central Montana.Science., Vol. 159, No. 3815, PP. 622-625.United States, Montana, Rocky MountainsKimberlite
DS1970-0091
1970
Hearn, B.C.JR.Hearn, B.C.JR.Xenoliths of the Bearpaw Mountains. Eagle Buttes, and Missouri River Breaks Montana.Gsa Penrose Conference, Sahuaro Lake, Arizona, Catalogue Of, PP. 93-98.United States, Montana, Rocky MountainsXenoliths, Petrography
DS1970-0712
1973
Hearn, B.C.JR.Hearn, B.C.JR., Boyd, F.R.Garnet Peridotite Xenoliths in a Montana Kimberlite. #1International Kimberlite Conference FIRST, EXTENDED ABSTRACT VOLUME., PP. 167-169.United States, Montana, Rocky MountainsKimberlite, Rocky Mountains
DS1975-0102
1975
Hearn, B.C.JR.Hearn, B.C.JR., Boyd, F.R.Garnet Peridotite Xenoliths in a Montana Kimberlite. #2Physics Chem. Earth., Vol. 9, PP. 247-256.United States, Montana, Rocky MountainsBlank
DS1975-0292
1976
Hearn, B.C.JR.Hearn, B.C.JR.Geologic and Tectonic Maps of the Bearpaw Mountains Area North Central Montana.United States Geological Survey (USGS) miscellaneous INV., MAP No. MI 919, 1:125, 000.United States, Montana, Rocky MountainsGeology, Tectonics
DS1975-1069
1979
Hearn, B.C.JR.Hearn, B.C.JR.Preliminary Map of Diatremes and Alkalic Ultramafic Intrusions in the Missouri River Breaks Vicinity, North Central Montana.United States Geological Survey (USGS) OPEN FILE REPORT., No. 79-128.United States, Montana, Rocky MountainsBlank
DS1980-0168
1980
Hearn, B.C.JR.Hearn, B.C.JR.Geology of the Williams Kimberlite Diatremes, North Centralmontana.Geological Society of America (GSA), Vol. 12, No. 6, MARCH P. 274. (abstract.).United States, Montana, Rocky MountainsBlank
DS1980-0229
1980
Hearn, B.C.JR.Mcgee, E.S., Hearn, B.C.JR.Garnets as Tracer Minerals for Montana KimberlitesGeological Society of America (GSA), Vol. 12, No. 6, P. 280, (abstract.).MontanaKimberlite, Rocky Mountains
DS1981-0210
1981
Hearn, B.C.JR.Hearn, B.C.JR.Diamond Potential of Missouri Breaks Diatremes, MontanaUnited States Geological Survey (USGS) PROF. PAPER., No. 1175, P. 4, (abstract.).United States, Montana, Rocky MountainsBlank
DS1981-0211
1981
Hearn, B.C.JR.Hearn, B.C.JR., Mcgee, E.S.Garnet Peridotites from the Williams Kimberlites, North Central Montana.Geological Society of America (GSA), Vol. 13, No. 4, P. 199, (abstract.).United States, Montana, Rocky MountainsBlank
DS1982-0267
1982
Hearn, B.C.JR.Hearn, B.C.JR., Mcgee, E.S.Garnet Peridotites from Williams Kimberlites, North-centralmontana, United States (us)Proceedings of Third International Kimberlite Conference, TERRA COGNITA, ABSTRACT VOLUME., Vol. 2, No. 3, P. 218, (abstract.).United States, Montana, Rocky MountainsKimberlite, Alnoite, Diatreme, Lherzolite, Harzburgite, Dunite
DS1982-0268
1982
Hearn, B.C.JR.Hearn, B.C.JR., Mcgee, E.S.Garnet in Montana Diatremes: a Key to Prospecting for Kimberlites.United States Geological Survey (USGS) OPEN FILE REPORT., No. 82-722, 45P.United States, Montana, Rocky MountainsKimberlite, Analyses, Williams, Big Slide, Bulletinwacker Coulee
DS1983-0300
1983
Hearn, B.C.JR.Hearn, B.C.JR., Mcgee, E.S.Garnet Peridotites from Williams Kimberlites, North Centralmontana, United States (us)United States Geological Survey (USGS) OPEN FILE., No. 83-172, 26P.United States, Montana, Rocky MountainsAlnoite, Xenoliths, Petrography, Lherzolite, Geology, Diatreme
DS1983-0441
1983
Hearn, B.C.JR.Mcgee, E.S., Hearn, B.C.JR.Lake Ellen Kimberlite, Michigan, United States (us)United States Geological Survey (USGS) OPEN FILE., No. 83-156, 22P.United States, Michigan, Great LakesXenolith, Megacrysts, Petrology, Petrography, Inclusions, Kimberite
DS1984-0351
1984
Hearn, B.C.JR.Hearn, B.C.JR., Mcgee, E.S.Garnet Peridotite from Williams Kimberlites, North Central Montana, United States (us)Proceedings of Third International Kimberlite Conference, Vol. 2, PP. 57-70.United States, Rocky Mountains, MontanaInclusions, Textures, Petrography, Mineral Chemistry, Analyses
DS1984-0503
1984
Hearn, B.C.JR.Mcgee, E.S., Hearn, B.C.JR.The Lake Ellen Kimberlite, Michigan, United States (us)Proceedings of Third International Kimberlite Conference, Vol. 1, PP. 143-154.United States, Michigan, Great LakesProspecting, History, Xenocrysts, Mineralogy, Analyses, Inclusion
DS1985-0276
1985
Hearn, B.C.JR.Hearn, B.C.JR.Alkalic Ultramafic Magmas, Missouri Breaks, Montana: the Kimberlite-alnoite Continuum.Geological Society of America (GSA), Vol. 17, No. 3, P. 161. (abstract.).United States, Montana, Rocky MountainsBlank
DS1985-0277
1985
Hearn, B.C.JR.Hearn, B.C.JR., Mcgee, E.S.Research on Kimberlites and Applications to Diamond Prospecting.United States Geological Survey (USGS) INF. Circular, No. 949, PP. 22-23.United States, Montana, Michigan, Colorado, Great Lakes, Rocky MountainsCurrent Review
DS1989-0607
1989
Hearn, B.C.Jr.Hearn, B.C.Jr.Alkalic ultramafic magmas in north central Montana, USA: genetic connections of alnoite, kimberlite and carbonatite #2Geological Society of Australia Inc. Blackwell Scientific Publishing, Special, No. 14, Vol. 1, pp. 109-119MontanaAlnoite, Kimberlite
DS1989-0608
1989
Hearn, B.C.Jr.Hearn, B.C.Jr., Collerson, K.D., MacDonald, R.A., Upton, B.G.J.Mantle crustal lithosphere of north central Montana,USA: evidence fromxenolithsNew Mexico Bureau of Mines Bulletin., Continental Magmatism Abstract Volume, Held, Bulletin. No. 131, p. 125. AbstractMontanaXenoliths
DS1989-0609
1989
Hearn, B.C.Jr.Hearn, B.C.Jr., Dudas, F.O., Eggler, D.H., Hyndman, D.W. , O'BrienMontana high pressureotassium igneous province. Crazy Mountains to Montana. July 20-27American Geophysical Union (AGU) 28th. International Geological Congress Field Trip Guidebook, No. T 346, 86pMontanaHighwood Mountains, Minettes, Shonkinites, Lamproites
DS1989-0984
1989
Hearn, B.C.Jr.McGee, E.S., Hearn, B.C.Jr.Primary and secondary mineralogy of carbonated peridotites from the Macdougal Springs diatremeGeological Society of Australia Inc. Blackwell Scientific Publishing, Special, No. 14, Vol. 2, pp. 725-734MontanaMineralogy, Peridotite
DS1991-0694
1991
Hearn, B.C.Jr.Hearn, B.C.Jr., Collerson, K.D., Upton, B.G.J., Macdonald, R.A.Ancient enriched upper mantle beneath north-central Montana: evidence fromxenolithsGuidebook of the Central Montana Alkalic Province, ed. Baker, D.W., Berg. R., No. 100, pp. 133-135. extended abstractMontanaMantle, xenoliths
DS1993-0721
1993
Hearn, B.C.Jr.Irving, A.J., Carlson, R.W., Hearn, B.C.Jr.Differentiation history of lithospheric mantle: Osmium, Strontium, neodymium and lead isotopic evidence from garnet peridotite xenoliths, Williams kimberlite, MontanaEos, Transactions, American Geophysical Union, Vol. 74, No. 16, April 20, supplement abstract p. 320MontanaGeochronology
DS1994-0749
1994
Hearn, B.C.Jr.Hearn, B.C.Jr.Composite megacrysts and megacryst aggregates from the Williamskimberlites, Montana, USA: multiple products of mantle melts. #2Proceedings of Fifth International Kimberlite Conference, Vol. 1, pp. 388-404.MontanaMegacrysts, Deposit -Williams
DS1998-0214
1998
Hearn, B.C.Jr.Carlson, R.W., Irving, A.J., Hearn, B.C.Jr.Peridotite xenoliths from the William kimberlite, Montana: implications for delamination Wyoming Craton7th International Kimberlite Conference Abstract, pp. 132-4.MontanaLithosphere - geochronology, Deposit - WilliaM.
DS201412-0213
2014
Hearn, B.C.Jr.Duke, G.I., Carlson, R.W., Frost, C.D., Hearn, B.C.Jr., Eby, G.N.Continental scale linearity of kimberlite-carbonatite magmatism, mid-continent North America.Earth and Planetary Science Letters, Vol. 403, pp. 157-163.Canada, United StatesLineaments
DS1987-0351
1987
Hearn, B.C.Jr.He YongnianKirby, S.H., Hearn, B.C.Jr.He Yongnian, Lin ChuangyongGeophysical implications of mantle xenoliths ; evidence for fault zones In the deep lithosphere of eastern ChinaUnited States Geological Survey (USGS) Circular No. 956 Geophysics and petrology of the deep crust and, pp. 63-65ChinaLineaments
DS200712-1141
2007
Hearn, E.H.Welford, J.K., Hearn, E.H., Clowes, R.M.Possible role of midcrustal igneous sheet intrusions in cratonic arch formation.Tectonics, Vol. 26, 11p.United States, CanadaCratonic arches
DS2003-0215
2003
Hearn, Jr. B.C.Carlson, R.W., Irving, A.J., Schulze, D.J., Hearn, Jr. B.C.Timing of lithospheric mantle modification beneath the Wyoming Craton8 Ikc Www.venuewest.com/8ikc/program.htm, Session 4, AbstractColorado, MontanaMantle geochemistry, Geochronology, Sloan, Homestead, Williams
DS2003-0571
2003
Hearn, Jr. B.C.Hearn, Jr. B.C.Upper mantle xenoliths in the Homestead kimberlite central Montana, USA: depleted8 Ikc Www.venuewest.com/8ikc/program.htm, Session 6, POSTER abstractMontanaDeposit - Homestead
DS200412-0279
2003
Hearn, Jr.B.C.Carlson, R.W., Irving, A.J., Schulze, D.J., Hearn, Jr.B.C.Timing of lithospheric mantle modification beneath the Wyoming Craton.8 IKC Program, Session 4, AbstractUnited States, Colorado, MontanaMantle geochemistry Geochronology, Sloan, Homestead, Williams
DS200412-0813
2003
Hearn, Jr.B.C.Hearn, Jr.B.C.Upper mantle xenoliths in the Homestead kimberlite central Montana, USA: depleted and re enriched Wyoming craton samples.8 IKC Program, Session 6, POSTER abstractUnited States, MontanaMantle petrology Deposit - Homestead
DS1991-0695
1991
Hearn, T.Hearn, T., Beghoul, N., Barazangi, M.Tomography of the western United States from regional arrival timesJournal of Geophysical Research, Vol. 96, No. B 10, September 10, pp. 16, 369-16, 381Basin and Range, CordilleraCrust -thickness, Geophysics -seismics
DS1999-0726
1999
Hearn, T.Tandon, K., Brown., L., Hearn, T.Deep structure of the northern Rio Grande rift beneath the San Luis basin (Colorado) from a seismic surveyTectonophysics, Vol. 302, No. 1-2, Feb. 15, pp. 41-56.ColoradoTectonics, rift evolution
DS1991-1375
1991
Hearn, T.M.Pratt, T.L., Hauser, E.C., Hearn, T.M., Reston, T.J.Reflection polarity of the Midcrustal Surrency bright spot beneath southeastern Georgia. Testing the fluid hypothesisJournal of Geophysical Research, Vol. 96, No. B6, June 10, pp. 10, 145-10, 158GeorgiaGeophysics, Tectonics
DS200512-0413
2004
Hearn, T.M.Hearn, T.M., Wang, S., Ni, J.F., Xu, Z., Yu,Y., Zhang, X.Uppermost mantle velocities beneath Chin a and surrounding regions.Journal of Geophysical Research, Vol. 109, 11, DOI 10:1029/2003 JB002874ChinaGeophysics - seismics
DS1991-0696
1991
Hearne, B.C.Jr.Hearne, B.C.Jr.Composite megacrysts and megacryst aggregates from the Williamskimberlites, Montana, United States (US): multiple products of mantle melts #1Proceedings of Fifth International Kimberlite Conference held Araxa June, pp. 170-172MontanaWillams, kimberlites, Geochemistry
DS2003-0206
2003
Hearne, B.J.Jr.Canil, D., Schulze, D.J., Hall, D., Hearne, B.J.Jr., Milliken, S.M.Lithospheric roots beneath western Laurentia: the geochemical signal in mantle garnetsCanadian Journal of Earth Sciences, Vol. 40, 8, Aug. pp. 1027-51.Wyoming, British ColumbiaTectonics,geochemistry, geochronology, Ni thermometry
DS200412-0266
2003
Hearne, B.J.Jr.Canil, D., Schulze, D.J., Hall, D., Hearne, B.J.Jr., Milliken, S.M.Lithospheric roots beneath western Laurentia: the geochemical signal in mantle garnets.Canadian Journal of Earth Sciences, Vol. 40, 8, Aug. pp. 1027-51.United States, WyomingTectonics,geochemistry, geochronology, Ni thermometry
DS1991-0697
1991
Hearne, S.C.Hearne, S.C.Geology of the Montana diatremesConference registration The Canadian Institute of Mining, Metallurgy and Petroleum (CIM) Xerox Tower Suite 1210, 3400 de Maissoneuve, Sept. 5-13, 1991 Fax 514 939-2714MontanaDiatremes, Alkaline rocks
DS1987-0286
1987
Hearns, B.C.Jr.Hearns, B.C.Jr., McGee, E.S.Crust and upper mantle beneath the Northern Plains; evidence from MontanaxenolithsUnited States Geological Survey (USGS) Circular No.956 Geophysics and petrology of the deep crust and upper, pp. 32-34MontanaXenoliths
DS2000-0969
2000
Hearns, P.USGS, Hearns, P., Hare, Schruber, Sherrill, LaMarGlobal GIS database: digital atlas of Central and South AmericaUsgs, DDS-62-A ( CD ROM)Central America, South AmericaDigital Data series - atlas
DS1994-0750
1994
Hearst, R.Hearst, R., Morris, W., Thomas, M.Magnetic interpretation along the Sudbury structure -Lithoprobe transectGeophy. Res. Letters, Vol. 21, No. 10, May 15, pp. 951-954OntarioLithoprobe, Sudbury Structure
DS2002-0692
2002
Hearts on FireHearts on FireA milestone advertising campaign in the world of branded diamonds: Hearts on Fire national WOW campaign building its brand through local partnerships.Hearts on Fire, Nov. 25, 1p.MassachusettsPress release, diamond synthesis
DS1981-0212
1981
Heasler, H.P.Heasler, H.P.A Summary of Geothermal Potential and Development in WyomingThe Interstate Oil Compact Comm. Committee Bulletin., Vol. 23, No. 1, PP. 18-26.United States, Wyoming, Rocky MountainsBlank
DS1997-0497
1997
Heasley, D.Heasley, D.Indigineous people are part of environmental protectionMining Engineering, Vol. 49, No. 11, Nov. pp. 20-21GlobalAboriginal, Native - claims
DS2002-0693
2002
Heath, C.P.M.Heath, C.P.M.Technical, non-technical and other skills needed by Canadian Mining, Petroleum, Public Sector organizationsGeoscience Canada, Vol.29,1,March pp. 21-34.CanadaMining - skill profile
DS1960-0557
1965
Heath, D.C.Heath, D.C., Toerien, D.K.A Cryptovolcanic Structure on Hatzium Ii. 28, Southwest Africa.Geological Survey of South Africa Annual Report, Vol. 1, PP. 81-85.Southwest Africa, NamibiaGeology, Hatzium Dome
DS1988-0296
1988
Heath, K.C.G.Heath, K.C.G.Mine costing... remarks on a previously published paperTransactions of the Institute of Mining and Metallurgy (IMM), Vol. 97, October pp. A 196-197. Database # 17539ZambiaGeostatistics, Costs-mining
DS200612-0557
2005
Heath, P.J.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
DS1975-1138
1979
Heathcote, R.Mccormick, G., Heathcote, R.Mineralogy of the Morrilton Alvikite Dike, Conway County, ArkansasGeological Society of America (GSA), Vol. 11, P. 163. (abstract.).United States, Gulf Coast, Arkansas, Conway CountyBlank
DS1970-0925
1974
Heathcote, R.C.Heathcote, R.C.Fenitization of the Arkansaw Novaculite and Adjacent Intrusive, Garland County, Arkansaw.M.s. Thesis, University Arkansaw, 56P.United States, Gulf Coast, Arkansas, Garland CountyAlteration
DS1975-0293
1976
Heathcote, R.C.Heathcote, R.C.Fenitization of the Arkansaw Novaculite, Garland County, Arkansas.Geological Society of America (GSA), Vol. 8, No. 6, P. 910. (abstract.).United States, Gulf Coast, Arkansas, Garland CountyAlteration
DS1975-1070
1979
Heathcote, R.C.Heathcote, R.C.Temporal Relationships of Carbonatite and Fenite at Potash Sulfur Springs, Arkansaw.Geological Society of America (GSA), Vol. 11, No. 2, PP. 148-149. (abstract.).United States, Gulf Coast, Arkansas, Garland CountyPetrology
DS1981-0213
1981
Heathcote, R.C.Heathcote, R.C., Owens, D.R.Formation of Vanadium at Potash Sulfur Springs, ArkansawGeological Society of America (GSA), Vol. 13, No. 7, P. 470. (abstract.).United States, Gulf Coast, Arkansas, Garland CountyVanadium
DS1987-0287
1987
Heathcote, R.C.Heathcote, R.C.Mica compositions and carbonatite petrogenesis in the potash Sulfur Springs intrusive complex, Garland County, ArkansawPhd. Thesis, University of Iowa, Iowa City, Iowa, 144pArkansasBlank
DS1987-0452
1987
Heathcote, R.C.McCormick, G.R., Heathcote, R.C.Mineral chemistry and petrogenesis of carbonatite intrusions, Perry and Conway Counties, ArkansawAmerican Mineralogist, Vol. 72, No. 1-2, Jan-Feb. pp. 59-66ArkansasUSA, Carbonatite
DS1989-0610
1989
Heathcote, R.C.Heathcote, R.C., McCormick, G.R.Major-cation substitution in phlogopite and evolution of carbonatite In the Potash Sulfur Springs complex, Garland County, ArkansawAmerican Mineralogist, Vol. 74, No. 1-2, January-February pp. 132-140ArkansasAnalyses: Clinopyroxenes, phlogopite
DS1991-1489
1991
Heather, K.B.Sage, R.P., Heather, K.B.The structure, stratigraphy and mineral deposits of the Wawa areaGeological Association of Canada (GAC) Annual Meeting held Toronto May 1991, Guidebook, No. A6, 38pOntarioGeology, Wawa, Structure, Iron
DS2002-1104
2002
HeatheringtonMueller, P.A., Heatherington, Kelly, Wooden, MogkPaleoproterozoic crust within the Great Falls tectonic zone: implications for assembly of southern Laurentia.Geology, Vol. 30, No. 2, Feb. pp. 127-30.MontanaTectonics, Archean Hearne, Wyoming
DS1987-0288
1987
Heatherington, A.Heatherington, A., Bowring, S.A., Luhr, J.Petrogenesis of calc-alkaline and alkaline volcanics from the western Mexican volcanic belt PB-isotopesGeological Society of America, Vol. 19, No. 7 annual meeting abstracts, p.698. abstracMexicoMinette
DS1996-1001
1996
Heatherington, A.Mueller, P.A., Heatherington, A.Proterozoic evolution of the Northwestern Wyoming CratonGeological Society of America, Abstracts, Vol. 28, No. 7, p. A-314.WyomingTectonics, Geochronology
DS2002-0473
2002
Heatherington, A.Foster, D.A., Mueller, P.A., Heatherington, A., Vogl, J., Meert, J., Lewis, R.Configuration of the 2.0 - 1.6 GA accretionary margin NW of the Wyoming Province:Geological Society of America Annual Meeting Oct. 27-30, Abstract p. 559.WyomingTectonics, Gondwana
DS1994-1249
1994
Heatherington, A.L.Mueller, P.A., Heatherington, A.L., Wooden, J.L., et al.Precambrian zircons from the Florida basement: a Gondwanan connectionGeology, Vol. 22, No. 2, Feberuary pp. 119-122GlobalGondwana, Geochronology
DS1996-1002
1996
Heatherington, A.L.Mueller, P.A., Heatherington, A.L., Nutman, A.P.Contrasts between samarium-neodymium (Sm-Nd) whole rock and uranium-lead (U-Pb) zircon systematics in the Tobacco Root batholith, Montana..Tectonophysics, Vol. 265, No. 1/2, Nov. 15, pp. 169-180MontanaGeochronology, Crustal age provinces
DS1996-1003
1996
Heatherington, A.L.Mueller, P.A., Heatherington, A.L., Nutman, A.P.Contrasts between samarium-neodymium (Sm-Nd) whole rock and uranium-lead (U-Pb) (U-Pb) zircon systematics in the Tobacco Root batholith, MontanaTectonophysics, Vol. 265, No. 1/2, Nov. 5, pp. 169-180.MontanaGeochronology, Crustal age Provinces
DS1975-0494
1977
Heatherington, E.A.Denison, R.E., Burke, W.H., Otto, J.B., Heatherington, E.A.Age of Igneous and Metamorphic Activity Affecting the Ouachita Foldbelt.Arkansaw GEOL. COMM., PP. 25-40.United States, Oklahoma, ArkansasStructure, Geochronology
DS201609-1707
2016
Heaton, T.Broom-Fendley, S., Heaton, T., Wall, F., Gunn, G.Tracing the fluid source of heavy REE mineralization in carbonatites using a novel method of oxygen isotope analysis in apatite: the example of Songwe Hill, Malawi.Chemical Geology, Vol. 440, pp. 275-287.Africa, MalawiCarbonatite

Abstract: Stable (C and O) isotope data from carbonates are one of the most important methods used to infer genetic processes in carbonatites. However despite their ubiquitous use in geological studies, it is suspected that carbonates are susceptible to dissolution-reprecipitation and isotopic resetting, especially in shallow intrusions, and may not be the best records of either igneous or hydrothermal processes. Apatite, however, should be much less susceptible to these resetting problems but has not been used for O isotope analysis. In this contribution, a novel bulk-carbonatite method for the analysis of O isotopes in the apatite PO4 site demonstrates a more robust record of stable isotope values. Analyses of apatite from five carbonatites with magmatic textures establishes a preliminary Primary Igneous Apatite (PIA) field of d18O = + 2.5 to + 6.0‰ (VSMOW), comparable to Primary Igneous Carbonatite (PIC) compositions from carbonates. Carbonate and apatite stable isotope data are compared in 10 carbonatite samples from Songwe Hill, Malawi. Apatite is heavy rare earth element (HREE) enriched at Songwe and, therefore, oxygen isotope analyses of this mineral are ideal for understanding HREE-related mineralisation in carbonatites. Carbonate C and O isotope ratios show a general trend, from early to late in the evolution, towards higher d18O values (+ 7.8 to + 26.7‰, VSMOW), with a slight increase in d13C (- 4.6 to - 0.1‰, VPDB). Oxygen isotope ratios from apatite show a contrary trend, decreasing from a PIA field towards more negative values (+ 2.5 to - 0.7‰, VSMOW). The contrasting results are interpreted as the product of the different minerals recording fluid interaction at different temperatures and compositions. Modelling indicates the possibility of both a CO2 rich fluid and mixing between meteoric and deuteric waters. A model is proposed where brecciation leads to depressurisation and rapid apatite precipitation. Subsequently, a convection cell develops from a carbonatite, interacting with surrounding meteoric water. REE are likely to be transported in this convection cell and precipitate owing to decreasing salinity and/or temperature.
DS200412-0221
2004
Heber, V.S.Brooker, R.A., Heber, V.S., Kelly, S.P., Wood, B.J.Noble gas partitioning during mantle melting: possible retention of He & Ar relative to U, Th & K.Lithos, ABSTRACTS only, Vol. 73, p. S15. abstractMantleMelting
DS201701-0026
2016
Hebert, C.Piet, H., Badro, J., Nabiel, F., Dennenwaldt, T., Shim, S-H., Cantoni, M., Hebert, C., Gillet, P.Spin and valence dependence on iron partitioning in Earth's deep mantle.Proceedings of National Academy of Science USA, Vol. 113, no. 40, pp. 11127-11130.MantleUHP

Abstract: We performed laser-heated diamond anvil cell experiments combined with state-of-the-art electron microanalysis (focused ion beam and aberration-corrected transmission electron microscopy) to study the distribution and valence of iron in Earth's lower mantle as a function of depth and composition. Our data reconcile the apparently discrepant existing dataset, by clarifying the effects of spin (high/low) and valence (ferrous/ferric) states on iron partitioning in the deep mantle. In aluminum-bearing compositions relevant to Earth's mantle, iron concentration in silicates drops above 70 GPa before increasing up to 110 GPa with a minimum at 85 GPa; it then dramatically drops in the postperovskite stability field above 116 GPa. This compositional variation should strengthen the lowermost mantle between 1,800 km depth and 2,000 km depth, and weaken it between 2,000 km depth and the D" layer. The succession of layers could dynamically decouple the mantle above 2,000 km from the lowermost mantle, and provide a rheological basis for the stabilization and nonentrainment of large low-shear-velocity provinces below that depth.
DS201805-0964
2018
Hebert, C.Nabiel, F., Badro, J., Dennenwaldt, T., Oveisi, E., Cantoni, M., Hebert, C., El Goresy, A., Barrat, J-A., Gillet, P.A large planetary body inferred from diamond inclusions in a urelite metorite.Nature Communications, doe:10.1038/ s41467-018- 030808-6 6p. PdfTechnologyureilite

Abstract: Planetary formation models show that terrestrial planets are formed by the accretion of tens of Moon- to Mars-sized planetary embryos through energetic giant impacts. However, relics of these large proto-planets are yet to be found. Ureilites are one of the main families of achondritic meteorites and their parent body is believed to have been catastrophically disrupted by an impact during the first 10 million years of the solar system. Here we studied a section of the Almahata Sitta ureilite using transmission electron microscopy, where large diamonds were formed at high pressure inside the parent body. We discovered chromite, phosphate, and (Fe,Ni)-sulfide inclusions embedded in diamond. The composition and morphology of the inclusions can only be explained if the formation pressure was higher than 20?GPa. Such pressures suggest that the ureilite parent body was a Mercury- to Mars-sized planetary embryo.
DS200912-0291
2009
Hebert, L.B.Hebert, L.B., Antoshechkina, P., Asimow, P., Gurnis, M.Emergence of low viscosity channel in subduction zones through the coupling of mantle flow and thermodynamics.Earth and Planetary Interiors, Vol. 278, 3-4, pp. 243-256.MantleSubduction
DS1997-0402
1997
Hebert, R.Giguere, E., Hebert, R., Sharma, K.N.M., Cimon, J.Les peridotites grenvilliennes de l'Ouest du Quebec et leur potentiel diamantifere.Quebec Department of Mines, DV 97-03, p. 39.QuebecExploration - assessment
DS1998-0507
1998
Hebert, R.Giguere, E., Hebert, R., Sharma, K.N.M., Cimon, J.Les roches ultramafiques de la region de Temiscamingue et Fort CoulongeQuebec Department of Mines, DV 98-05, p. 41.QuebecExploration - assessment
DS1998-1038
1998
Hebert, R.Morin, D., Corriveau, L., Hebert, R.Magmatic suites underplating the southern Grenville Province: ultramafic xenoliths of 1.07 Ga Rivard dyke.Geological Association of Canada (GAC)/Mineralogical Association of Canada (MAC) Abstract Volume, p. A127. abstract.QuebecMinette, Xenolith - petrography
DS1980-0169
1980
Hebert, S.Hebert, S.Diamonds 1980East Sussex: Wayland World Resources Series, 72P.South Africa, GlobalKimberley, Mineral Resources
DS201801-0022
2017
Hecht, H.Hecht, H., Oguchi, T.Global evalusation of erosion rates in relation to tectonics. Progress in Earth and Planetary Science, 7p. PdfGlobaltectonics

Abstract: Understanding the mechanisms and controlling factors of erosion rates is essential in order to sufficiently comprehend bigger processes such as landscape evolution. For decades, scientists have been researching erosion rates where one of the main objectives was to find the controlling factors. A variety of parameters have been suggested ranging from climate-related, basin morphometry and the tectonic setting of an area. This study focuses on the latter. We use previously published erosion rate data obtained mainly using 10Be and sediment yield and sediment yield data published by the United States Geological Survey. We correlate these data to tectonic-related factors, i.e., distance to tectonic plate boundary, peak ground acceleration (PGA), and fault distribution. We also examine the relationship between erosion rate and mean basin slope and find significant correlations of erosion rates with distance to tectonic plate boundary, PGA, and slope. The data are binned into high, medium, and low values of each of these parameters and grouped in all combinations. We find that groups with a combination of high PGA (>?0.2.86 g) and long distance (>?1118.69 km) or low PGA (
DS1986-0354
1986
Hecht, J.Hecht, J.The chemical vapor that grows diamonds. (Editorial)New Scientist, Vol. 112, No. 1529, October 9, p. 28. (abstract.)GlobalDiamond morphology
DS1994-0751
1994
Hecht, J.Hecht, J.Buckyballs add polish to diamond filmsNew Scientist, July 30, p. 20.GlobalCVD diamond filM.
DS201212-0364
2012
Hecht, L.Koeberl, C., Claeys, P., Hecht, L., McDonald, I.Geochemistry of impactites.Elements, Vol. 8, 1, Feb. pp. 37-42.TechnologyPGM, isotopes
DS1989-0611
1989
Heck, F.R.Heck, F.R.Mesozoic extension in the southern AppalachiansGeology, Vol. 17, No. 8, August pp. 711-714AppalachiaTectonics, Rifts
DS1991-0319
1991
Hecker, B.Crane, K., Hecker, B., Golubev, V.Heat flow and hydrothermal vents in Lake Baikal, U.S.S.REos Transactions, Vol. 72, No. 52, December 24, pp. 585, 588RussiaTectonics, Rifting
DS202007-1145
2020
Hecker, J.G.Hecker, J.G., Marks, M.A.W., Wenzel, T., Markl, G.Halogens in amphibole and mica from mantle xenoliths: implications for the halogen distribution and halogen budget of the metasomatized continental lithosphere.American Mineralogist, Vol. 105, pp. 781-794.Mantlemetasomatism

Abstract: This study reports halogen contents (F and Cl) of amphibole and phlogopite derived from mantle xenoliths and one peridotite massif, for amphibole and phlogopite megacrysts and ultramafic magmatic cumulates (hornblendites) found in alkaline volcanic rocks from 12 localities in Europe and Africa. Amphibole and phlogopite contain more F than Cl with F/Cl ratios reaching about 160 in phlogopites and 50 in amphiboles. Phlogopites are higher in F (median of 3400 µg/g) than amphibole (median of 1000 µg/g), while median Cl contents are higher in amphibole (290 µg/g) compared to phlogopite (180 µg/g). The Cl contents and the F/Cl ratios in amphibole and phlogopite from mantle xenoliths exhibit large differences between samples of the same region, recording very large variations of halogen contents in the continental lithosphere. We suggest that the halogen content in such samples largely depends on the initial composition of percolating melts and fluids in the continental lithosphere. During reaction of these agents with peridotitic wall-rocks, Cl is preferentially retained in the fluid as it is much more incompatible compared to water and F. This desiccation effect continuously increases salinity (Cl content) and decreases the F/Cl ratio in the agent with time, causing variable Cl contents and F/Cl ratios in amphibole and phlogopite at a specific locality. Subsequent partial melting processes may then sequester and re-distribute, especially Cl among amphibole, phlogopite and melts/fluids as a result of its strong incompatibility, whereas F is much less affected as it behaves slightly compatible. The impact of even small amounts of amphibole and mica on the total halogen budget in the continental lithosphere is significant and both minerals can effectively contribute to the high halogen contents typical of alkaline melts.
DS1992-0692
1992
Hedenquist, J.W.Hedenquist, J.W.Magmatic contributions to hydrothermal systems and the behavior of volatiles in magmaJapan Geological Survey, Report No. 279, 200pMantleMagmatism, Volatiles
DS1999-0488
1999
Hedenquist, J.W.Molnar, F., Lexa, J., Hedenquist, J.W.Eoithermal mineralization of the Western CarpathiansSociety of Economic Geologists Guidebook, Vol. 31, 260p.Hungary, SlovakiaBook - table of contents, Gold, metallogeny
DS201712-2674
2017
Hedenquist, J.W.Arndt, N.T., Fontbote, L., Hedenquist, J.W., Kesler, S.E., Thompson, J. F.H., Wood, D.G.Future Global and Mineral Resources.geochemicalperspectives.org, Vol. 6, 1, April, 187p. Pdf 28 MBGlobalgeochemistry

Abstract: Some scientists and journalists, and many members of the general public, have been led to believe that the world is rapidly running out of the metals on which our modern society is based. Advocates of the peak metal concept have predicted for many decades that increasing consumption will soon lead to exhaustion of mineral resources. Yet, despite ever-increasing production and consumption, supplies of minerals have continued to meet the needs of industry and society, and lifetimes of reserves remain similar to what they were 30-40 years ago. In this volume, we discuss the reasons for this apparent paradox using our broad experience and expertise on both academic and industrial sides of the minerals sector. Many misconceptions arise from flawed estimates of the size of global mineral resources which stem from a lack of understanding of the critical difference between reserves and resources. Some authors use quoted reserves – the amount of metal proven to exist and to be economic for mining at present – when predicting imminent shortages. Resources – the amount that may be accessible in the upper few kilometres of the crust – are far larger.Over the last 150 years, improved technologies, economies of scale and increased efficiency have combined to reduce costs hence allowing lower-grade ore to be mined economically. The net result is that the long-term inflation-adjusted price of most metals has decreased more or less in parallel with increasing production, a second apparent paradox that frequently is not well understood. Using copper as the principal example and other metals as appropriate, we summarise the latest research on ore deposits and the activities of the minerals industry. Following a description of the numerous geological processes that form ore deposits, we outline the scientific methods used by the minerals industry to explore for new deposits. We also discuss how resources are mined and how minerals are processed, as well as recent efforts to reduce related environmental impacts. Economic and societal factors influence supply, and these are as important as the actual presence of a resource. Finally, we discuss the critical roles that geoscientists will play in assuring continued supplies of minerals. These include the development of new concepts and techniques that will assist the discovery, mining, processing, remediation, and management of mineral resources. It is essential that researchers help to educate the general public about the need for continued exploration to find new resources to meet growth in world living standards. We demonstrate that global resources of copper, and probably of most other metals, are much larger than most currently available estimates, especially if increasing efficiencies and higher prices allow lower-grade ores to be mined. These observations indicate that supplies of important mineral commodities will remain adequate for the foreseeable future.
DS1960-0669
1966
Hedge, C.E.Goldich, S.S., Lidiak, E.G., Hedge, C.E., Wathall, F.G.Geochronology of the Midcontinent Region, United States. Pt. 2. Northern Area.Journal of GEOPHYSICAL RESEARCH, Vol. 71, No. 22, PP. 5389-5408.GlobalMid-continent
DS1960-0670
1966
Hedge, C.E.Goldich, S.S., Muehlberger, W.R., Kidiak, E.G., Hedge, C.E.Geochronology of the Midcontinent Region, United States. Pt. 4: Eastern Area.Journal of GEOPHYSICAL RESEARCH, Vol. 71, No. 22, PP. 5375-5388.GlobalMid-continent
DS1960-0713
1966
Hedge, C.E.Muehlberger, W.R., Hedge, C.E., Denison, R.E., Marvin, R.F.Geochronology of the Midcontinent Region, United States. Pt. 3, Southern Area.Journal of GEOPHYSICAL RESEARCH, Vol. 71, PP. 5409-5426.GlobalMid-continent
DS1960-1008
1968
Hedge, C.E.Peterman, Z.E., Hedge, C.E., Braddock, W.A.Age of Precambrian Events in the Northeast Front Range, Colorado.Journal of Geophysical Research, Vol. 73, PP. 2277-2296.United States, Colorado, State Line, Rocky MountainsDiatreme
DS1975-0336
1976
Hedge, C.E.Mccallum, M.E., Hedge, C.E.Rubidium-strontium Ages of Granitic Rocks in the Rawah Batholith, medicine Bow Mountains, Northern Colorado.Isochron West., No. 17, PP. 33-37.United States, State Line, Colorado, WyomingGeochronology, Batholites
DS1982-0072
1982
Hedge, C.E.Armbrustmacher, T.J., Hedge, C.E.Genetic implications of minor element and Strontium isotope geochemistry of alkaline rocks complexes...Contributions to Mineralogy and Petrology, Vol. 79, pp. 424-35.ColoradoAlkaline Rocks, Wet Mountains Area
DS1982-0570
1982
Hedge, C.E.Smith, C.B., Mccallum, M.E., Hedge, C.E.Rubidium-strontium Isotopic Ratios in Selected Lower Crust Upper Mantle nodules from Colorado-Wyoming Kimberlites.United States Geological Survey (USGS) OPEN FILE Report, No. 82-0178, 22P.Colorado, WyomingKimberlite, State Line, Rocky Mountains
DS201805-0963
2018
Hedge, V.S.McKenzie, N.R., Smyre, A.J., Hedge, V.S., Stockli, D.F.Continental growth histories revealed by detrital zircon trace elements: a case study from India. Geology, Vol. 46, 3, pp. 275-278.Indiacraton

Abstract: Simultaneous acquisition of detrital zircon Pb-Pb ages and trace element abundances from grains collected across the Indian craton, spanning ~3 b.y., reveals prominent shifts in Eu/Eu* and light and middle to heavy rare earth element ratios. These shifts correspond to a ca. 3.0-2.2 Ga interval of crustal thickening during Indian craton formation, followed by a period wherein arc magmatism occurred along thinner craton margins from ca. 1.9 to 1.0 Ga, with arc magmatism concentrated along attenuated continental margins after ca. 1.0 Ga. Similar temporal shifts in trace element concentrations are recognized in global whole-rock compilations. We propose that the post-1.0 Ga increase in juvenile magmatism reflects a switch to lateral arc terrane accretion as the primary style of continental growth over the past billion years.
DS2002-0694
2002
Hedlin, M.A.Hedlin, M.A., Shearer, P.M.Probing mid-mantle heterogeneity using PKP coda wavesPhysics of the Earth and Planetary Interiors, Vol. 130, No. 3-4, pp. 195-208.MantleGeophysics - seismics, Core-mantle boundary
DS1999-0659
1999
Hedlin, M.A.H.Shearer, P.M., Flanagan, M.P., Hedlin, M.A.H.Experiments of migration processing of SS precursor dat a to image Upper mantle discontinuity structure.Journal of Geophysical Research, Vol. 104, No. 4, Apr. 10, pp. 7229-42.MantleDiscontinuity
DS1970-0527
1972
Heeley, G.P.Heeley, G.P.Meeting New Demands for Mine "dust"Johannesburg: International Diamond Annual, Vol. 2, PP. 277-278.South AfricaDiamond Mining Recovery, Kimberlite Pipes
DS200512-0414
2005
Heemskerk, M.Heemskerk, M.Collecting dat a in artisanal and small scale mining communities: measuring progress towards more sustainable livelihoods.Natural Resources Forum, Vol.29, 1, pp. 82-87.Not specific to diamonds
DS201212-0290
2012
Heenan BlaikieHeenan BlaikieCSA provides guidance to clarify use and disclosure od preliminary economic assessments.Heenan Blaikie, Aug. 16, 3p. SummaryCanadaLegal - PEA
DS1998-1510
1998
Heeremans, M.Van Balen, R.T., Heeremans, M.Middle Proterozoic early Paleozoic evolution of central Baltoscandi nan intracratonic basins: evidence diapirs..Tectonophysics, Vol. 300, No. 1-4, Dec. 31, pp. 131-42.Norway, Sweden, ScandinaviaTectonic, Craton - Baltoscandia
DS2000-0461
2000
Heeremans, M.Kaikkonen, P., Moisio, K., Heeremans, M.Thermomechanical lithospheric structure of the Central Fennoscandian ShieldPhysical Earth and Planetary Interiors, Vol. 119, No.3-4, May. pp.209-35.Finland, Baltic Shield, FennoscandiaGeothermometry, Tectonics, seismicity
DS1930-0217
1936
Heertje, H.Heertje, H.Die Diamantbewerkers Van AmsterdamAmsterdam: D.b. Centens Uitgevers Maatschappy, 317P.GlobalAmsterdam Diamond Trade, Kimberley
DS1989-1338
1989
Hefferan, K.Saquaque, A., Admou, H., Karson, J., Hefferan, K., Reuber, I.Precambrian accretionary tectonics in the Bou-Azzer-El Graara region, Anti-Atlas, MoroccoGeology, Vol. 17, No. 12, December pp. 1107-1110MoroccoOphiolite, Late Proterozoic
DS2000-0401
2000
Hefferan, K.P.Hefferan, K.P., Admou, H., Saquaque, A.Anti-Atlas (Morocco) role in Neoproterozoic western GondwanaPrecambrian Research, Vol. 103, No. 1-2, Sept. pp.89-96.MoroccoTectonics, Gondwana
DS1992-0693
1992
Hefferman, V.Hefferman, V.Canada - exploration overview of diamond play in CanadaSeg Newsletter, No. 9, April p. 16Northwest TerritoriesNews item, Dia Met, BHP, Monopros
DS200412-0814
2004
Hefferman, V.Hefferman, V.Mineral property valuation. International movement to standardize property valuation gains momentum.Engineering and Mining Journal, August pp. 21-22,24,26.AustraliaEconomics - not specific to diamonds
DS200812-0460
2007
Hefferman, V.Hefferman, V.Renard pre-feasibility hinges on access, diamond value.Diamonds in Canada Magazine, Northern Miner, November pp. 26-27.Canada, QuebecNews item - Renard
DS200812-0461
2007
Hefferman, V.Hefferman, V.It's the homestretch for De Beers at Victor.Diamonds in Canada Magazine, Northern Miner, November pp. 23-25.Canada, Ontario, AttawapiskatNews item - Victor
DS201112-0426
2011
Hefferman, V.Hefferman, V.The Point Lake 'epiphany' how a single discovery spawned an entire industry.Diamonds in Canada Magazine, Northern Miner, November pp. 12-19.Canada, Northwest TerritoriesHistory of companies
DS201712-2692
2017
Hefferman, V.Hiyate, A., Hefferman, V.Dominion's latest transformation .. Next chapter Washington Companies takeover is just the latest twist in the company's history.Diamonds In Canada Magazine, Northern Miner, Nov. pp. 4-5.Canada, Northwest Territoriesdeposit - Ekati
DS200512-0415
2005
Heffernan, V.Heffernan, V.Canada's diamond potential sparkles. The north remains the focus of exploration but Saskatchewan, Ontario and Quebec are also in the spotlight.Investment Research, August pp. 33-36.CanadaNews item - projects and overview
DS200712-0424
2007
Heffernan, V.Heffernan, V.Victor mine. Ontario's first diamond mine approaches production. Provinical avarice taints Victor mine on eve of opening.Diamonds in Canada Magazine, Northern Miner, June p. 10-13.Canada, Ontario, AttawapiskatVictor mine
DS200812-0462
2008
Heffernan, V.Heffernan, V.Is Amaruk the real deal? Buoyed by early results, Diamonds North seeks size in Nunavut's most promising diamond camp.Northern Miner, Diamonds in Canada, June pp. 2-5.Canada, NunavutHistory, overview
DS200812-0463
2008
Heffernan, V.Heffernan, V.Taher-ible.... little room for error reality and then things get rough.Northern Miner, Mining Markets, Vol. 1, 1, pp. 32-36.Canada, NunavutJericho mine
DS201112-0427
2010
Heffernan, V.Heffernan, V.A major gamble .. for metal miners dabbling in diamonds can mean a big payoff or dashed hopes. History of BHP, Rio, Teck, Newmont, Kinross.Diamonds in Canada Magazine, Northern Miner, Nov. pp. 18-20.CanadaNews item - history
DS201312-0374
2013
Heffernan, V.Heffernan, V.Airborne EM methods: be wary of relying on the tried and true. Brief mention of EkatiEarthExplorer @geosoft.com, 1p. PrecisTechnologyGeophysics
DS201412-0350
2014
Heffernan, V.Heffernan, V.Rediscovering its swagger. A look at how Canada's minerals industry can adapt in the face of uncertainty. Core Magazine , Fall, pp. 4,5,6,8,9.CanadaDiscoveries - costs, mine-life trends, reglatories
DS201212-0060
2012
Hefffrich, G.R.Bastow, I.D., Kendall, J.M., Brisbourne, A.M., Snyder, D.B., Thompson, D., Hawthorne, D., Hefffrich, G.R., Wookey, J., Horleston, A., Eaton, D.The Hudson Bay lithospheric experiment.Astronomy and Geophysics, pp. 6.21-6.24.Canada, Ontario, QuebecGeophysics - seismics
DS2003-0572
2003
Heffrich, G.Heffrich, G., Ascencio, E., Knapp, J., Owens, T.Transition zone structure in a tectonically inactive area: 410 and 660 km discontinuityGeophysical Journal International, Vol. 155, 1, pp. 193-199.North Sea, EuropeGeophysics - seismics, mantle
DS200412-0815
2003
Heffrich, G.Heffrich, G., Ascencio, E., Knapp, J., Owens, T.Transition zone structure in a tectonically inactive area: 410 and 660 km discontinuity properties under the northern North Sea.Geophysical Journal International, Vol. 155, 1, pp. 193-199.EuropeGeophysics - seismics, mantle
DS1992-0694
1992
Heflin, J.R.Heflin, J.R., Garito, A.F.Buckministerfullerene: optics beyond the limitsNature, Vol. 356, No. 6366, March 19, p. 192GlobalFullerenes, Optics
DS2000-0402
2000
Hegardt, E.Hegardt, E., Cornell, D.H.A 1.0 Ga crustal subduction and exhumation model for BalticaJournal of African Earth Sciences, p. 38. abstract.Baltic States, Norway, Sweden, KolaSubduction, Tectonics
DS1989-0540
1989
Hegarty, K.A.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
DS200612-0629
2005
Hegarty, K.A.Jackson, M.P.A., Hudec, M.R., Hegarty, K.A.The great West African Tertiary coastal uplift: fact or fiction? A perspective from the Angola Rift.Tectonics, Vol. 24, 6, TC6013. 10.1029/2005 TC1836Africa, West Africa, AngolaGeomorphology
DS2000-0151
2000
Hegde, G.V.Chadwick, B., Vasudev, V.N., Hegde, G.V.The Dharwar Craton, southern India, interpreted as the result of Late Archean oblique convergence.Precambrian Research, Vol. 99, No. 1-2, pp. 91-111.India, south IndiaTectonics, Craton - Dharwar
DS200812-0464
2008
Hegde, V.S.Hegde, V.S., Chavadi, V.C.Geochemistry of dykes around Arabali, western Dharwar Craton and petrogenetic inferences.Journal of the Geological Society of India, Vol. 71, 5, pp. 651-660.IndiaDykes
DS202007-1135
2020
Hegde, V.S.Corfu, F., Hegde, V.S.U-Pb systematics of the western Dharwar craton - glimpse of a billion year history of crustal evolution and relations to ancient supercratons.Journal of South American Earth Sciences, Vol. 102, 102659, 12p. PdfIndiageochronology

Abstract: The Dharwar Craton developed progressively over a billion years, through two main stages of crustal growth separated by a few-hundred million year long period of relative quiescence. The first stage between 3.4 and 3.0 Ga developed a proto-craton, which was considerably amplified during the second main stage between 2.7 and 2.4 Ga, through extensive magmatism, tectonism, and crustal consolidation. This paper reports U-Pb dating results obtained in four specific areas of the craton, with the data encompassing key moments in this long development. Rocks formed during the proto-craton stage include a 3089 Ma augen gneiss and a 2973 Ma evolved granite, the latter of which marks the final cratonization event of the proto-craton. The beginning of the second main stage is recorded in this study by 2650 Ma tonalite and trondhjemite, a 2623 Ma granite dyke cutting augen gneiss, and 2614, 2602 and 2588 Ma volcanic rocks. Titanite responded differently to the long evolution, as a function of location and type of overprint. It preserved an original 2973 Ma magmatic age in the west, but was reset and/or crystallized during secondary events in central domains of the craton, yielding ages between 2590 and 2360 Ma. A diorite stock intruded at 2207 Ma in the consolidated crust. It is correlated with the Anantapur-Kunigal mafic dyke swarm, one of a series of such events in the Dharwar Craton between 2.35 and 1.79 Ma. In terms of its overall evolution the Dharwar Craton has an affinity with the Slave clan, which includes the Wyoming and Zimbabwe cratons. It also matches many features in the evolution of the São Francisco Craton, a probable other member of Sclavia. This is in contrast to the Amazonian Craton, which has more affinity with the Superior clan.
DS1997-0498
1997
Hegenberg, F.E.N.Hegenberg, F.E.N.Brazilian mining industry in the age of liberalisation privitising CVRDJournal of Mineral Policy, Vol. 12, No. 3, pp. 2-10BrazilEconomics, Privitization, legal
DS1985-0043
1985
Hegenberger, W.Balfour, D.J., Hegenberger, W., Medlycott, A.S., Wilson, K.J.Kimberlites Near Sikereti, North Eastern Southwest Africa/namibia.Communs. Geological Survey Swa/namibia., Vol. 1, PP. 69-77.Southwest Africa, NamibiaHistory, Pipe, Lithology, Petrography, Xenoliths, Age Of Emplacement
DS200812-0192
2008
Hegger, E.Chakhmouradian, A.H., Bohm, C.O., Demeny, A., Reguir, E.P., Hegger, E., Halden, N.M., Yang, P.Kimberlite from Wekusko Lake, Manitoba: a diamond indicator bearing beforsite and not a kimberlite, after all.9IKC.com, 3p. extended abstractCanada, manitobaCarbonatite
DS2000-0539
2000
HegnerKroner, A., Willner, A.P., Collins, A., Hegner, MuhongoThe Mozambique Belt of East Africa and Madagascar: a new zircon and neodymium ages - implications Rodinia, GondwanaJournal of African Earth Sciences, p. 49. abstract.GlobalSupercontinent - Gondwana
DS1989-0612
1989
Hegner, E.Hegner, E., Kyser, T.K., Hulbert, L.neodymium, Strontium and Oxygen isotopic constraints on the petrogenesis of mafic intrusions in the Proterozoic Trans-Hudson orogen of central CanadaCanadian Journal of Earth Sciences, Vol. 26, No. 5, May pp. 1027-1035OntarioGeochronology, Mafic intrusions
DS1989-0613
1989
Hegner, E.Hegner, E., Kyserm T.K., Hulbert, L.neodymium, Strontium, and Oxygen isotopic constraints on the petrogenesis of mafic intrusions in the Proterozoic Trans Hudson OrogenCanadian Journal of Earth Sciences, Vol. 26, pp. 1027-35.Saskatchewan, ManitobaGeochronology
DS1994-0752
1994
Hegner, E.Hegner, E., Kroner, A., Hunt, P.A precise uranium-lead (U-Pb) (U-Pb) zircon age for the Archean Pongola Supergroup volcanics inSwazilandJournal of African Earth Sciences, Vol. 18, No. 4, May pp. 339-342GlobalGeochronology, Archean
DS1995-0780
1995
Hegner, E.Hegner, E., Ruddick, J.C., Fortier, S.M., Hulbert, L.neodymium, Strontium, Phosphorus, Argon, and Oxygen isotopic systematics of Sturgeon Lake kimberlite-emplacement age, alteration, source..Contributions to Mineralogy and Petrology, Vol. 120, No. 2, Jun. pp. 212-222.SaskatchewanGeochronology, Deposit -Sturgeon Lake
DS1995-0781
1995
Hegner, E.Hegner, E., Walter, H.J., Satir, M.lead, Strontium, neodymium isotope compositions and trace element geochemistry of megacrysts and melilitites from UrachContributions to Mineralogy and Petrology, Vol. 122, pp. 322-335.GermanyTertiary Urach field, isotopes, European Volcanic Province
DS1997-0569
1997
Hegner, E.Kalt, A., Hegner, E., Satir, M.neodymium, Strontium, and lead isotopic evidence for diverse lithospheric mantle sources of East African carbonatiteTectonophysics, Vol. 278, No. 1-4, Sept. 15, pp. 31-46.Africa, east Africa, Tanzania, KenyaTectonics, Rifting, Carbonatite
DS1998-0093
1998
Hegner, E.Beard, A.D., Downes, H., Hegner, E., Sablukov, S.M.Mineralogy and geochemistry of Devonian ultramafic minor intrusions of southern Kola Peninsula.Contributions to Mineralogy and Petrology, Vol. 130, pp. 288-303.Russia, Arkangelsk, Kola PeninsulaKimberlites, mellilites, Petrogenesis
DS2000-0538
2000
Hegner, E.Kroner, A., Hegner, E., Pidgeon, R.T.Age and magmatic history of the Antananrivo Block, central Madagascar: derived from zircon geochronologyAmerican Journal of Science, Vol. 300, No. 4, Apr. pp. 251-88.MadagascarMagmatism, Geochronology - age determinations, isotopic
DS2002-0174
2002
Hegner, E.Blusztajn, J., Hegner, E.Osmium isotope systematics of melilitites from the Tertiary Central European Volcanic province in SW Germany.Chemical geology, Vol. 189, 1-2, pp. 91-103.GermanyMelilitites, Geochronology
DS2003-0863
2003
Hegner, E.Mahotkin, I.L., Downes, H., Hegner, E., Beard, A.D.Devonian dike swarms of alkaline, carbonatitic and primitiv magma type rocks from the8ikc, Www.venuewest.com/8ikc/program.htm, Session 4, POSTER abstractRussia, Kola PeninsulaMantle geochemistry
DS200412-0439
2004
Hegner, E.Demeny, A., Vennemann, T.W., Hegner, E., Nagy, G., Milton, J.A., Embey-Isztin, A., Homonnay, Z., Dobosi, G.Trace element and C O Sr Nd isotope evidence for subduction related carbonate silicate melts in mantle xenoliths ( Pannonian BasLithos, Vol. 75, 1-2, July pp. 89-113.Europe, HungarySubduction, trace element fingerprinting, petrogenetic
DS200812-0194
2008
Hegner, E.Chakhmouradian, A.R., Demeny, A., Reguir, E.P., Hegner, E., Halden, N.M., Yang, P.'Kimberlite' from Wekusko Lake, Manitoba: re-assessment and implications for further exploration. Beforsite ( primary dolomite carbonatite)... 'notion' could beManitoba Geological Survey, Nov. 21, 1p. abstract.Canada, ManitobaPetrology - potentially diamondiferous
DS200812-0296
2007
Hegner, E.Downes, H., Mahotkin, I.I., Beard, A.D., Hegner, E.Petrogenesis of alkali silicate, carbonatitic and kimberlitic magmas of the Kola alkaline carbonatite province.Vladykin Volume 2007, pp. 45-56.Russia, Kola PeninsulaCarbonatite
DS201012-0094
2009
Hegner, E.Chakhmouradian, A.R., Bohm, C.O., Demeny, A., Reguir, E.P., Hegner, E., Creaser, R.A., Halden, N.M., Yang, P.'Kimberlite' from Wekusko Lake Manitoba: actually a diamond indicator bearing dolomite carbonatite.Lithos, Vol. 112 S pp. 347-357.Canada, ManitobaCarbonatite
DS201212-0617
2012
Hegner, E.Sajeev, K., Windley, B.F., Hegner, E., Komiya, T.High temperature, high pressure granulites ( retrogressed eclogites) in the central region of the Lewisian NW Scotland: crustal scale subduction in the Neoarchean.Gondwana Research, in pressEurope, ScotlandEclogite
DS201811-2586
2018
Hegner, E.Kroner, A., Nagel, T.J., Hoffmann, J.E., Liu, X., Wong, J., Hegner, E., Xie, H., Kasper, U., Hofmann, A., Liu, D.High temperature metamorphism and crustal melting at ca. 3.2 Ga in the eastern Kaapvaal craton.Precambrian Research, Vol. 317, pp. 101-116.Africa, South Africacraton

Abstract: The question of whether high-grade metamorphism and crustal melting in the early Archaean were associated with modern-style plate tectonics is a major issue in unravelling early Earth crustal evolution, and the eastern Kaapvaal craton has featured prominently in this debate. We discuss a major ca. 3.2?Ga tectono-magmatic-metamorphic event in the Ancient Gneiss Complex (AGC) of Swaziland, a multiply deformed medium- to high-grade terrane in the eastern Kaapvaal craton consisting of 3.66-3.20?Ga granitoid gneisses and infolded greenstone remnants, metasedimentary assemblages and mafic dykes. We report on a 3.2?Ga granulite-facies assemblage in a metagabbro of the AGC of central Swaziland and relate this to a major thermo-magmatic event that not only affected the AGC but also the neighbouring Barberton granitoid-greenstone terrane. Some previous models have related the 3.2?Ga event in the eastern Kaapvaal craton to subduction processes, but we see no evidence for long, narrow belts and metamorphic facies changes reflecting lithospheric suture zones, and there is no unidirectional asymmetry in the thermal structure across the entire region from Swaziland to the southern Barberton granite-greenstone terrane as is typical of Phanerozoic and Proterozoic belts. Instead, we consider an underplating event at ca. 3.2?Ga, giving rise to melting in the lower crust and mixing with mantle-derived under- and intraplated mafic magma to generate the voluminous granitoid assemblages now observed in the AGC and the southern Barberton terrane. This is compatible with large-scale crustal reworking during a major thermo-magmatic event and the apparent lack of a mafic lower crust in the Kaapvaal craton as shown by seismic data.
DS202009-1630
2020
Hegner, E.Hegner, E., Rajesh, S., Willbold, M., Muller, D., Joachimiski, M., Hofmann, M., Linnemann, U., Zieger, J., Pradeepkumar, A.P.Sediment derived origin of the putatative Munnar carbonatite, South India.Journal of Asian Earth Science, Vol. 200, 104432, 18p. PdfIndiadeposit - Munnar

Abstract: Metacarbonate assemblages in high-grade metamorphic terranes often pose challenges when trying to distinguish between mantle-derived carbonatite and sedimentary carbonate protoliths. We present a study of granulite-facies metacarbonate samples of the putative Munnar carbonatite described as decimeter-thick dikes and veins, and layers of a meter-thick metacarbonate and calc-silicate assemblage, respectively. Thin sections of the metacarbonate dike samples show absence of pyrochlore and ubiquitous scapolite, titanite, wollastonite, and detrital zircons are compatible with impure limestone protoliths. Nd and Sr isotope compositions indicate protoliths with Paleoproterozoic crustal residence times which contrast the mantle sources of Indian and global carbonatites. Trace-element patterns display the characteristics of upper crust, and Ce- and Y-anomalies in a number of samples suggest protolith formation under marine conditions. Carbon and oxygen isotope compositions of the metacarbonate samples interlayered with calc-silicate rocks are similar to those in marine limestone. The metacarbonate dikes, however, show mantle-like compositions which are interpreted as reflecting equilibration with mantle-derived CO2 during granulite-facies metamorphism. The dikes yielded a U-Pb zircon crystallization age of 1020 ± 70 Ma and a cross-cutting quartz syenite, thought to be cogenetic, a magmatic age of 620 ± 35 Ma; the hosting gneiss provided a magmatic age of 2452 ± 14 Ma. We conclude that the layered metacarbonate and calc-silicate rocks represent a former marine limestone and marl sequence and the metacarbonate dikes and veins small-volume melts of crust-derived carbonate-rich sediment.
DS1992-0210
1992
Hei, K.J.Canil, D., Hei, K.J.Constraints on the origin of mantle-derived low Calcium garnetsContributions to Mineralogy and Petrology, Vol. 109, No. 4, February pp. 421-430MantleGarnets -low calcium.
DS201504-0204
2015
Heidari, H.Kaminsky, F.V., Ryabchikov, I.D., McCammon, C.A., Longo, M., Abakumov, A.M., Turner, S., Heidari, H.Oxidation potential in the Earth's lower mantle as recorded by ferropericlase inclusions in diamond.Earth and Planetary Science Letters, Vol. 417, pp. 49-56.South America, BrazilDeposit - Juina
DS1970-0558
1972
Heidari, M.Mcginnis, L.D., Heigold, P.C., Heidari, M., Carlson, D.R.Second Generation Gravity Studies in the MidcontinentGeological Society of America (GSA), Vol. 4, No. 5, P. 337. (abstract.).GlobalMid-continent
DS2003-0597
2003
Heidelbach, F.Holtzman, B.K., Kohlstedt, D.L., Zimmerman, M.E., Heidelbach, F., Hiraga, T.Melt segregation and strain partitioning: implications for seismic anisotropy and mantleScience, No. 5637, August 29,p. 1227-29.MantleGeophysics - seismic
DS200412-0845
2003
Heidelbach, F.Holtzman, B.K., Kohlstedt, D.L., Zimmerman, M.E., Heidelbach, F., Hiraga, T., Hustoft, J.Melt segregation and strain partitioning: implications for seismic anisotropy and mantle flow.Science, No. 5637, August 29,p. 1227-29.MantleGeophysics - seismic
DS200612-1420
2005
Heidelbach, F.Terry, M.P., Heidelbach, F.Deformation enhanced metamorphic reactions and the rheology of high pressure shear zones, Western Gneiss region, Norway.Journal of Metamorphic Geology, Vol. 24, 1, pp. 3-18.Europe, NorwayUHP
DS1950-0216
1955
Heidgen, H.Heidgen, H.The Diamond Seeker in Tanganyika. the Story of John Williamson.Austria: Verlag Styria., 139P.Tanzania, East AfricaKimberlite
DS1995-0782
1995
Heidi, F.Heidi, F., Wlotzha, F.MeteoritesSpringer, 242p. approx. $ 30.00GlobalBook -ad, Meteorites
DS1950-0475
1959
Heidigen, H.Heidigen, H.The Diamond Seeker. (biography of Williamson)London: Blackie., Tanzania, East AfricaKimberlite, Kimberley, Janlib, Biography
DS1960-0152
1961
Heier, K.S.Heier, K.S.Layered Gabbro, Hornblendite, Carbonatite and Nepheline Syenite on Stjernoy.Norsk Geol. Tidsskr., Vol. 41, PP. 109-155.Norway, ScandinaviaPetrography
DS1960-0249
1962
Heier, K.S.Heier, K.S.A Note on the Uranium, Thorium, and Potassium Contents in the Nepheline syenite and Carbonatite on Stjernoy.Norske Geol. Tidsskr., Vol. 42, PP. 287-292.Norway, ScandinaviaUltramafic And Related Rocks, Uranium, Thorium
DS1960-0460
1964
Heier, K.S.Heier, K.S.Geochemistry of the Nepheline Syenite on StjernoyNorske Geol. Tidsskr., Vol. 44, PP. 205-215.Norway, ScandinaviaUltramafic And Related Rocks
DS1970-0155
1970
Heier, K.S.Mysen, B.O. , Heier, K.S.A Note on the Field Occurrence of a Large Eclogite on Hareid,sunmore, Western Norway.Norske Geol. Tidsskr., Vol. 50, No. 1, PP. 93-96.Norway, ScandinaviaBlank
DS1970-0572
1972
Heier, K.S.Mysen, B.O., Heier, K.S.Petrogenesis of Eclogites in High Grade Metamorphic Terrains As Exemplified by the Hereidland Eclogite, Western Norway.Contributions to Mineralogy and Petrology, Vol. 36, PP. 73-94.Norway, ScandinaviaPetrography
DS1992-0695
1992
Heier, K.S.Heier, K.S.Lands cape geochemistry: retrospect and prospect -1990. critical comments #1Applied Geochemistry, Vol. 7, No. 1, January pp. 57-59GlobalGeomorphology, geochemistry, Environmental geochemistry -review
DS1997-0202
1997
Heiffrich, G.R.Collier, J.D., Heiffrich, G.R.Topography of the 410 and 660 km seismic discontinuties in the Izu - Bonin subduction zone.Geophys. Research Letters, Vol. 24, No. 12, June 15, pp. 1535-38.GlobalSubduction zone, Geophysics - seismics
DS1970-0558
1972
Heigold, P.C.Mcginnis, L.D., Heigold, P.C., Heidari, M., Carlson, D.R.Second Generation Gravity Studies in the MidcontinentGeological Society of America (GSA), Vol. 4, No. 5, P. 337. (abstract.).GlobalMid-continent
DS1991-0698
1991
Heigold, P.C.Heigold, P.C.Seismic reflection and seismic refraction surveying in northeasternIllinoisIllinois State Geological Survey, Environmental Geology Report No. 36, 52p. (Ontario Geological Survey (OGS))GlobalGeophysics -seismics, Refraction
DS1991-0910
1991
Heigold, P.C.Kolata, D.R., Heigold, P.C.Proterozoic crustal domain boundary in the southern part of the IllinoisBasinGeological Society of America, Abstract Volume, Vol. 23, No. 3, March p. 22GlobalGeophysics, Cocorp
DS1993-0647
1993
Heigold, P.C.Heigold, P.C., Kolata, D.R.Proterozoic crustal boundary in the southern part of the Illinois BasinTectonophysics, Vol. 217, pp. 307-319GlobalCocorp, Geophysics -seismics
DS1995-1513
1995
Heigold, P.C.Potter, C.J., Goldhaber, M.B., Heigold, P.C., Drahovzal, J.Structure of the Reelfoot Rough Creek Rift System, Fluorspar area fault complex and Hicks Dome...United States Geological Survey (USGS) Prof. paper, No. 1538- Q, 20p.Midcontinent, Illinois, KentuckyGeophysics - seismics
DS2002-1651
2002
Heijboer, T.C.Van Roermund, H.L.M., Carswell, D.A., Drury, M.R., Heijboer, T.C.Microdiamonds in a megacrystic garnet websterite pod from Bardane on the island ofGeology, Vol. 30, 11, Nov. pp. 959-62.NorwaySubduction - deep continental, diamond genesis
DS1994-0460
1994
Heikamp, S.Duba, A., Heikamp, S., Meurer, W., NOver, G., Will, G.Evidence from borehole samples for the role of accessory minerals in lower crustal conductivity.Nature, Vol. 367, No. 6458, January 6, pp. 59-61.MantleSubduction
DS2000-0702
2000
Heikkinen, P.Neprochov, Y.P., Semenov, G.A., Heikkinen, P.Comparison of the crustal structure of the Barents Sea and the Baltic Shield from seismic data.Tectonophysics, Vol.321, No.4, June 30, pp.429-48.Baltic States, Norway, Sweden, Kola, RussiaTectonics, Geophysics - seismics
DS2001-0626
2001
Heikkinen, P.Korje, A., Heikkinen, P., Aaro, S.Crustal structure of the northern Baltic Sea paleoriftTectonophysics, Vol. 331, No. 4, Feb. 28, pp. 341-58.Baltic SeaTectonics - rifting
DS200612-0755
2006
Heikkinen, P.Kuusisto, M., Kukkonen, L.T., Heikkinen, P., Pesonen, L.J.Lithological interpretation of crustal composition in the Fennoscandian Shield with seismic velocity data.Tectonophysics, in pressEurope, Finland, FennoscandiaGeophysics - seismics, wide-angle reflection
DS1995-1003
1995
Heikkinen, P.J.Korja, A., Heikkinen, P.J.Proterozoic extensional tectonics of the central Fennoscandian Shield:results from Baltic and BothnianTectonics, Vol. 14, No. 2, April pp. 504-517.Fennoscandia, Finland, SwedenTectonics, BABEL, Geophysics -seismics, lithosphere
DS200812-0592
2008
Heikkinen, P.J.Korja, A., Heikkinen, P.J.Seismic images of Paleoproterozoic microplate boundaries in the Fennoscandian Shield.Geological Society of America Special Paper, 440, pp. 229-248.Europe, Finland, FennoscandiaGeophysics - seismic
DS1960-0850
1967
Heilammer, R.Kaplan, G., Faure, D., Ellroy, R., Heilammer, R.Contribution a L'etude de L'origine des LamproitesCentr. Rech. ( Pau-snpa ) Bulletin., Vol. 1, No. 1, PP. 153-159.Australia, Western AustraliaLeucite, Lamproite, Mt. North, Geochronology, K Ar, Rb Sr
DS1920-0448
1929
Heiland, C.A.Heiland, C.A.Geophysical Methods of Prospecting: Principles and Recent Successes.Col. Sch. Mines Quarterly, Vol. 24, MARCH, PP. 1-163. (P. 45.).United States, Gulf Coast, Arkansas, PennsylvaniaGeophysics, Prospecting Methods, Kimberlite
DS1930-0162
1934
Heiland, C.A.Heiland, C.A.Precious Stones (1934)American Institute Mining Engineering Transactions, Vol. 110, P. 571.United States, Gulf Coast, ArkansasDiamond Occurrence
DS2000-0403
2000
Heilbron, M.Heilbron, M., Brito Neves, B.B., Pimentel, M.M., et al.Neoproterozoic orogenic systems in eastern, central and northeastern Brasil,and evolution of Gondwana.Igc 30th. Brasil, Aug. abstract only 1p.Brazil, West AfricaTectonics - Craton, orogeny
DS201312-0375
2013
Heilbronner, R.Heilbronner, R., Barrett, S.Image analysis in Earth Sciences…. Micro structures and textures.Springer, $ 99. 00 520p.TechnologyBook - textures
DS201905-1061
2019
Heilimo, E.Nandy, J., Dey, S., Heilimo, E.Neoarchean magmatism through arc and lithosphere melting: evidence from eastern Dharwar craton.Geological Journal, doi.10.1002/gj.3498Indiacraton

Abstract: The Neoarchaean era is characterized by rapid crustal growth corresponding to some fundamental global changes in geodynamic processes. However, the nature of crustal growth including the mechanism and tectonic setting of the Neoarchaean are controversial issues. The eastern Dharwar Craton (EDC) exposes widespread Neoarchaean granite-greenstone belts, which provide an opportunity to evaluate the various models proposed for Neoarchaean crustal growth. In this study, we present field, petrographic, and geochemical data and discuss the petrogenesis and significance for crustal evolution for a suite of previously undescribed banded gneisses, TTG (tonalite-trondhjemite-granodiorite), biotite granites, alkali feldspar granite and gabbro. These rocks are associated with Neoarchaean metavolcanic and metapelites rocks of the Tsundupalle greenstone belt, in the eastern fringe of the EDC. Whole-rock major and trace element geochemical data are consistent with diverse sources, including both crust and enriched mantle in an evolving subduction zone. A convergent orogenic setting is proposed for interpreting the association of various granitoids in the Tsundupalle area. Finally, intrusion of crustally derived, highly silicic, alkali-rich granite, and mantle-derived gabbro emplaced in a post-subduction regime is proposed. Lithospheric delamination and attendant mantle melting are suggested as possible mechanisms for generation of these rocks. The understanding of generation of the different granitoid types along with gabbro provides significant insights into the mechanism of Neoarchaean crustal growth.
DS1995-0087
1995
Heimann, A.Baer, G., Heimann, A.Physics and chemistry of dykesBalkema, 350pGlobalDykes, geochemistry, Table of contents
DS200612-0558
2005
Heimbach, J.Heimbach, J.Ekati Diamond Mine - Panda, Koala and Fox, are these animals related? A comparison of ore body geology at the Ekati Diamond Mine.32ndYellowknife Geoscience Forum, p. 29 abstractCanada, Northwest TerritoriesGeology
DS200812-0248
2007
Heimbach, J.Coutts, B., Heimbach, J., Dyck, D.Panda, from pyrope to production ( now you've found a kimberlite, the work is just starting). BHP Billiton35th. Yellowknife Geoscience Forum, Abstracts only p. 11-12.Canada, Northwest TerritoriesMine planning - Panda
DS1988-0224
1988
Heimlich, R.A.Freeman, M.J., Palmer, D.F, Heimlich, R.A.Magnetic survey of the western serpentinite belt,northern HartfordCounty, MarylandSoutheastern Geology, Vol. 29, No. 2, December pp. 103-128GlobalUltramafic, laterite, Geophysics
DS1989-0614
1989
Hein, F.J.Hein, F.J.Evaluation of petrographic and mineralogic analysis of marine placersedimentsGeological Survey of Canada Open File, No. 2141, 73p. $ 43.00 Precision Microfilming, HalifaxGlobalAlluvial placers -general, Petrography
DS1999-0263
1999
Hein, F.J.Greggs, D.H., Hein, F.J.Lineaments and basement tectonics in the Western Canada sedimentary basin8th. Calgary Mining forum, 1p. abstractSaskatchewan, AlbertaCraton, Tectonics - lineaments
DS1995-0783
1995
Hein, J.Hein, J.The regulator's view of the valuation of mineral assets in expert reportsAustralian Institute of Mining and Metallurgy (AusIMM) Bulletin, No. 1, Feb, pp. 24-29AustraliaEconomics, Ore reserve valuation
DS201510-1784
2015
Hein, K.A.A.Markwitz, V., Hein, K.A.A., Miller, J.Compilation of West African mineral deposits: spatial distribution and mineral endowment. ( mentions diamonds)Precambrian Research, in press available, 21p.Africa, Mali, Mauritania, Senegal, Burkina Faso, Ghana, Ivory CoastMetallogeny

Abstract: The West African Craton is highly endowed in minerals, and their spatial and temporal distribution varies from single to multi-phase mineralization events. They are broadly related to three major tectono-metallogenic elements and formed during distinct mineral epochs: (1) In both Archean Shields (Kénéma-Man and Reguibat) and Paleoproterozoic domains (Baoulé-Mossi, Eglab). These are characterized by giant iron ore deposits that formed between ca. 2.5-2.3 Ga, nearly all gold, porphyry copper, lead-zinc and sedimentary manganese ore that developed between 2.2 and 2.1 Ga, and primary diamonds that formed between two intervals at ca. 2.2-2.0 Ga and in the Mesozoic. (2) Across Pan-African and Variscan belts. These are distinguished by major Precambrian IOCG's, copper-gold that formed at ca. 2.1 Ga and approximately 680 Ma, and Neoproterozoic sedimentary iron ore and phosphate deposits. (3) Within intracratonic and coastal basins. These include the development of Cenozoic lateritic bauxites over Mesozoic dolerites, Tertiary/Quaternary mineral sands deposits, oolitic iron ore and sedimentary phosphate deposits. Geological, spatial and temporal correlations using the multi-commodity West African Mineral Deposit Database highlight that gold and non-gold commodities formed in multiple phases. This commenced in the Liberian Orogeny (2.9-2.8 Ga) with the enrichment of iron ore, nickel sulphides, diamonds and gold in the earth's crust. The pre-Eburnean or Tangaean-EoEburnean-Eburnean I Event yielded gold, and the major Eburnean Orogeny yielded gold, iron ore, manganese, diamonds, magmatic nickel sulphides, copper-gold, lead-zinc, and REE minerals. Throughout the Pan-African event sedimentary manganese deposits, lead-zinc, REE minerals, sedimentary phosphates, and again gold were formed. Primary diamonds and magmatic nickel sulphides are related to the break-up of Gondwana, followed by an intense lateritic weathering period that formed bauxite deposits along the craton margin.
DS201512-1940
2015
Hein, K.A.A.Markwitz, V., Hein, K.A.A., Jessell, M.W., Miller, J.Metallogenic portfolio of the West African Craton. ( mentions kimberlites)Ore Geology Reviews, Oct 28 10.024Africa, West AfricaReguibat shield, Kenema-Man shield

Abstract: The West African Craton hosts major resources of gold, iron ore, aluminium ore, diamonds, phosphates and manganese. This portfolio of ore deposits is linked to the formation of Archean -Paleoproterozoic greenstone belts, Jurassic rifting and extended periods of Mesozoic to Cenozoic weathering and erosion. We give a brief overview of the temporal and spatial distribution patterns of West African ore deposits with emphasis on the main commodity types. The oldest ore forming processes generated major resources in iron ore and gold in the Kénéma -Man and Reguibat Shields during the Neo-Archean. The majority of gold, porphyry copper, lead -zinc and sedimentary manganese deposits formed during the Paleoproterozoic, dominantly within the Baoulé-Mossi domain. At the same time diamond-bearing kimberlites developed in Ghana. Another distinct diamond event has been recognized in the Mesozoic of the Kénéma -Man shield. Isolated occurrences of IOCG's as well as copper -gold and gold formed in Pan-African/Variscan belts. During the Neoproterozoic, the majority of mineralization consists of sedimentary iron ore and phosphate deposits located within intracratonic basins. During the Phanerozoic aluminium ore, phosphates and mineral sands concentrated along the margins of the coastal and intracratonic basins.
DS201604-0618
2016
Hein, K.A.A.Markwitz, V., Hein, K.A.A., Jessell, M.W., Miller, J.Metallogenic portfolio of the West African craton. Mentions diamonds in S.L.Ore Geology Reviews, in press available 6p.Africa, Sierra LeoneMetallogeny
DS201605-0845
2016
Hein, K.A.A.Hein, K.A.A.West African mineral atlas monograph.Ore Geology Reviews, in press available outline 5p.Africa, West AfricaBook - Atlas
DS201608-1422
2016
Hein, K.A.A.Markwitz, V., Hein, K.A.A., Jessell, M.W., Miller, J.Metallogenic portfolio of the West Africa craton. Mentions diamonds in Ghana, Mali and GuineaOre Geology Reviews, Vol. 78, pp. 558-563.Africa, Ghana, Mali, GuineaAlluvials
DS1989-0615
1989
Hein, U.F.Hein, U.F.The genesis of the Gakara bastnaesite monazitedeposits: evidence from fluid inclusions79th. Annual Meeting Of The Geologische Vereinigung, Mineral, p. 34. (abstract.)GlobalBastnaesite, Alkaline
DS201312-0116
2013
Heine, C.Butterworth, N.P., Talsman, A.S., Muller, R.D., Seton, M., Bunge, H-P., Schuberth, B.S.A., Shephard, G.E., Heine, C.Geological, tomographic, kinematic and geodynamic constraints on the dynamics of sinking slabs.Earth Science Reviews, Vol. 126, pp. 235-249.MantleSubduction
DS201412-0087
2014
Heine, C.Butterworth, N.P., Talsma, A.S., Muller, R.D., Seton, M., Bunge, H-P., Schuberth, B.S.A., Shephard, G.E., Heine, C.Geological, tomographic, kinematic and geodynamic constraints on the dynamics of sinking slabs.Journal of Geodynamics, Vol. 73, pp. 1-13.MantleSubduction
DS201412-0351
2014
Heine, C.Heine, C., Brune, S.Oblique rifting of the Equatorial Atlantic: why there is no Saharan Atlantic Ocean.Geology, Vol. 42, 3, pp. 211-214.AfricaRift zone
DS201906-1327
2019
Heine, C.Muller, R.D., Zahirovic, S., Williams, S.E., Cannon, J., Seton, M., Bower, D.J., Tetley, M., Heine, C., Le Breton, E., Liu, S., Russell, S.H.J., Yang, T., Leonard, J., Gurnis, M.A global plate model including lithospheric deformation along major rifts and orogens since the Triassic.Tectonics, May 5, 36p. Mantleplate tectonics

Abstract: Global deep-time plate motion models have traditionally followed a classical rigid plate approach, even though plate deformation is known to be significant. Here we present a global Mesozoic-Cenozoic deforming plate motion model that captures the progressive extension of all continental margins since the initiation of rifting within Pangea at ~240 Ma. The model also includes major failed continental rifts and compressional deformation along collision zones. The outlines and timing of regional deformation episodes are reconstructed from a wealth of published regional tectonic models and associated geological and geophysical data. We reconstruct absolute plate motions in a mantle reference frame with a joint global inversion using hotspot tracks for the last 80 million years and minimizing global trench migration velocities and net lithospheric rotation. In our optimized model net rotation is consistently below 0.2°/Myr, and trench migration scatter is substantially reduced. Distributed plate deformation reaches a Mesozoic peak of 30 million km2 in the Late Jurassic (~160-155 Ma), driven by a vast network of rift systems. After a mid-Cretaceous drop in deformation it reaches a high of 48 million km2 in the Late Eocene (~35 Ma), driven by the progressive growth of plate collisions and the formation of new rift systems. About a third of the continental crustal area has been deformed since 240 Ma, partitioned roughly into 65% extension and 35% compression. This community plate model provides a framework for building detailed regional deforming plate networks and form a constraint for models of basin evolution and the plate-mantle system.
DS201907-1562
2019
Heine, C.Muller, D., Zahirovic, S., Williams, S.E., Cannon, J., Seton, M., Bower, D.J., Tetley, M., Heine, C., Le Breton, E., Liu, S., Russell, S.H.J., Yang, T., Leonard, J., Gurnis, M.A global plate model including lithospheric deformation along major rifts and orogens since the Triassic.Tectonics, in press available, 37p.Africa, globalplate tectonics, rotation

Abstract: Global deep-time plate motion models have traditionally followed a classical rigid plate approach, even though plate deformation is known to be significant. Here we present a global Mesozoic-Cenozoic deforming plate motion model that captures the progressive extension of all continental margins since the initiation of rifting within Pangea at ~240 Ma. The model also includes major failed continental rifts and compressional deformation along collision zones. The outlines and timing of regional deformation episodes are reconstructed from a wealth of published regional tectonic models and associated geological and geophysical data. We reconstruct absolute plate motions in a mantle reference frame with a joint global inversion using hot spot tracks for the last 80 million years and minimizing global trench migration velocities and net lithospheric rotation. In our optimized model, net rotation is consistently below 0.2°/Myr, and trench migration scatter is substantially reduced. Distributed plate deformation reaches a Mesozoic peak of 30 × 106 km2 in the Late Jurassic (~160-155 Ma), driven by a vast network of rift systems. After a mid-Cretaceous drop in deformation, it reaches a high of 48 x 106 km2 in the Late Eocene (~35 Ma), driven by the progressive growth of plate collisions and the formation of new rift systems. About a third of the continental crustal area has been deformed since 240 Ma, partitioned roughly into 65% extension and 35% compression. This community plate model provides a framework for building detailed regional deforming plate networks and form a constraint for models of basin evolution and the plate-mantle system.
DS201809-2109
2018
Heinen, B.Walter, M.J., Drewitt, J.W.E., Thomson, A.R., Zhang, H., Lord, O.T., Heinen, B.The fate of carbonate in oceanic crust subducted into Earth's mantle.Goldschmidt Conference, 1p. AbstractMantlesubduction

Abstract: The H/C ratio in earth’s exosphere is higher than it is in the source region of primitive basalts, suggesting an enriched carbon reservoir in the mantle[1]. A plausible explanation is that subduction of carbon may have enriched the mantle in recycled carbon over time. Average basaltic crust contains ~ 2 wt.% CO2 [2], and modeling of slab devolatilisation suggests that subducted carbonate may survive to be transported deeper into the mantle [3]. Carbonated oceanic crust should melt in the transition zone along most subduction geotherms due to a deep trough in the carbonated basalt solidus, and mineral inclusions in superdeep diamonds testify to carbonate melt in their formation [4]. Along cool subduction geotherms carbonate may subduct into the lower mantle, potentially enriching the deep mantle in carbon. Here we report on laser-heated diamond anvil cell experiments in the CaO-MgO-SiO2-CO2 and FeO-MgO-SiO2-CO2 systems at lower mantle pressures where we investigate the stability of carbonate in oceanic crust, and test for decarbonation and diamond forming reactions involving carbonate and coexisiting free silica. We find that carbonate reacts with silica to form bridgmanite ± Ca-perovskite + CO2 at pressures in the range of ~50 to 70 GPa. These decarbonation reactions form an impenetrable barrier to subduction of carbonate into the deeper lower mantle, however, slabs may carry solid CO2 (Phase V) into the deeper lower mantle. We also identify reactions where carbonate or CO2 dissociate to form diamond plus oxygen. We suggest that the deep lower mantle may become enriched in carbon in the form of diamond over time due to subduction of carbonate and solid CO2 and its eventual dissociation to form diamond plus oxygen. Release of oxygen during diamond formation may also provide a mechanism for locally oxidizing the deep mantle.
DS201903-0503
2019
Heinen, B.J.Drewitt, J.W.E., Walter, M.J., Zhang, H., McMahon, S.C., Edwards, D., Heinen, B.J., Lord, O.T., Anzellini, S., Kleppe, A.K.The fate of carbonate in oceanic crust subducted into Earth's lower mantle.Earth and Planetary Science Letters, Vol. 511, pp. 213-222.MantleBridgemanite

Abstract: We report on laser-heated diamond anvil cell (LHDAC) experiments in the FeO-MgO-SiO2-CO2 (FMSC) and CaO-MgO-SiO2-CO2 (CMSC) systems at lower mantle pressures designed to test for decarbonation and diamond forming reactions. Sub-solidus phase relations based on synthesis experiments are reported in the pressure range of ~35 to 90 GPa at temperatures of ~1600 to 2200 K. Ternary bulk compositions comprised of mixtures of carbonate and silica are constructed such that decarbonation reactions produce non-ternary phases (e.g. bridgmanite, Ca-perovskite, diamond, CO2-V), and synchrotron X-ray diffraction and micro-Raman spectroscopy are used to identify the appearance of reaction products. We find that carbonate phases in these two systems react with silica to form bridgmanite ±Ca-perovskite + CO2 at pressures in the range of ~40 to 70 GPa and 1600 to 1900 K in decarbonation reactions with negative Clapeyron slopes. Our results show that decarbonation reactions form an impenetrable barrier to subduction of carbonate in oceanic crust to depths in the mantle greater than ~1500 km. We also identify carbonate and CO2-V dissociation reactions that form diamond plus oxygen. On the basis of the observed decarbonation reactions we predict that the ultimate fate of carbonate in oceanic crust subducted into the deep lower mantle is in the form of refractory diamond in the deepest lower mantle along a slab geotherm and throughout the lower mantle along a mantle geotherm. Diamond produced in oceanic crust by subsolidus decarbonation is refractory and immobile and can be stored at the base of the mantle over long timescales, potentially returning to the surface in OIB magmas associated with deep mantle plumes.
DS1992-0633
1992
Heiner, T.Guocheng Pan, Moss, K., Heiner, T., Carr, J.R.A fortran program for three-dimensional cokriging with case demonstrationComputers and Geosciences, Vol. 18, No. 5, pp. 557-578GlobalGeostatistics, Program -cokriging
DS202009-1671
2020
Heinonen, A.Tiira, T., Janik, T., Skrzynik, T., Komminaho, K., Heinonen, A., Veikkolainen, T., Vakeva, S., Korja, A.Full scale crustal interpretation of Kokkola-Kymi ( KOKKY) seismic profile, Fennoscandian shield.Pure and Applied Geophysics, Vol. 177, 8, pp. 3775-3795. pdfEurope, Finlandgeophysics - seismics

Abstract: The Kokkola-Kymi Deep Seismic Sounding profile crosses the Fennoscandian Shield in northwest-southeast (NW-SE) direction from Bothnian belt to Wiborg rapakivi batholith through Central Finland granitoid complex (CFGC). The 490-km refraction seismic line is perpendicular to the orogenic strike in Central Finland and entirely based on data from quarry blasts and road construction sites in years 2012 and 2013. The campaign resulted in 63 usable seismic record sections. The average perpendicular distance between these and the profile was 14 km. Tomographic velocity models were computed with JIVE3D program. The velocity fields of the tomographic models were used as starting points in the ray tracing modelling. Based on collected seismic sections a layer-cake model was prepared with the ray tracing package SEIS83. Along the profile, upper crust has an average thickness of 22 km average, and P-wave velocities (Vp) of 5.9-6.2 km/s near the surface, increasing downward to 6.25-6.40 km/s. The thickness of middle crust is 14 km below CFGC, 20 km in SE and 25 km in NW, but Vp ranges from 6.6 to 6.9 km/s in all parts. Lower crust has Vp values of 7.35-7.4 km/s and lithospheric mantle 8.2-8.25 km/s. Moho depth is 54 km in NW part, 63 km in the middle and 43 km in SW, yet a 55-km long section in the middle does not reveal an obvious Moho reflection. S-wave velocities vary from 3.4 km/s near the surface to 4.85 km/s in upper mantle, consistently with P-wave velocity variations. Results confirm the previously assumed high-velocity lower crust and depression of Moho in central Finland.
DS201610-1875
2016
Heinonen, J.S.Jennings, E.S., Gibson, S.A., Maclennan, J., Heinonen, J.S.Deep mixing of mantle melts beneath continental flood basalt provinces: constraints from olivine hosted melt inclusions in primitive magmas. Etendeka and KarooGeochimica et Cosmochimica Acta, in press availableAfrica, NamibiaPicrite, ferroPicrite

Abstract: We present major and trace element compositions of 154 re-homogenised olivine-hosted melt inclusions found in primitive rocks (picrites and ferropicrites) from the Mesozoic Paraná-Etendeka and Karoo Continental Flood Basalt (CFB) provinces. The major element compositions of the melt inclusions, especially their Fe/Mg ratios, are variable and erratic, and attributed to the re-homogenisation process during sample preparation. In contrast, the trace element compositions of both the picrite and ferropicrite olivine-hosted melt inclusions are remarkably uniform and closely reflect those of the host whole-rocks, except in a small subset affected by hydrothermal alteration. The Paraná-Etendeka picrites and ferropicrites are petrogenetically related to the more evolved and voluminous flood basalts, and so we propose that compositional homogeneity at the melt inclusion scale implies that the CFB parental mantle melts were well mixed prior to extensive crystallisation. The incompatible trace element homogeneity of olivine-hosted melt inclusions in Paraná-Etendeka and Karoo near primitive magmatic rocks has also been identified in other CFB provinces and contrasts with findings from studies of basalts from mid-ocean ridges (e.g. Iceland and FAMOUS on the Mid Atlantic Ridge), where heterogeneity of incompatible trace elements in olivine-hosted melt inclusions is much more pronounced. We suggest that the low variability in incompatible trace element contents of olivine-hosted melt inclusions in near-primitive CFB rocks, and also ocean island basalts associated with moderately thick lithosphere (e.g. Hawaii, Galápagos, Samoa) may reflect mixing along their longer transport pathways during ascent and/or a temperature contrast between the liquidus and the liquid when it arrives in the crust. These thermal paths promote mixing of mantle melts prior to their entrapment by growing olivine crystals in crustal magma chambers. Olivine-hosted melt inclusions of ferropicrites from the Paraná-Etendeka and Karoo CFB have the least variable compositions of all global melt inclusion suites, which may be a function of their unusually deep origin and low viscosity.
DS201611-2115
2016
Heinonen, J.S.Jennings, E.S., Gibson, S.A., Maclennan, J., Heinonen, J.S.Deep mantle melts beneath continental flood basalt provinces: constraints from olivine hosted melt inclusions in primitive magmas.Geochimica et Cosmochimica Acta, Vol. 196, pp. 36-57.Africa, Namibia, AngolaParan-Etendeka, Karoo

Abstract: We present major and trace element compositions of 154 re-homogenised olivine-hosted melt inclusions found in primitive rocks (picrites and ferropicrites) from the Mesozoic Parana ´-Etendeka and Karoo Continental Flood Basalt (CFB) provinces. The major element compositions of the melt inclusions, especially their Fe/Mg ratios, are variable and erratic, and attributed to the re-homogenisation process during sample preparation. In contrast, the trace element compositions of both the picrite and ferropicrite olivine-hosted melt inclusions are remarkably uniform and closely re?ect those of the host whole-rocks, except in a small subset a?ected by hydrothermal alteration. The Parana ´-Etendeka picrites and ferropicrites are petrogenet- ically related to the more evolved and voluminous ?ood basalts, and so we propose that compositional homogeneity at the melt inclusion scale implies that the CFB parental mantle melts were well mixed prior to extensive crystallisation. The incompatible trace element homogeneity of olivine-hosted melt inclusions in Parana ´-Etendeka and Karoo primitive magmatic rocks has also been identi?ed in other CFB provinces and contrasts with ?ndings from studies of basalts from mid- ocean ridges (e.g. Iceland and FAMOUS on the Mid Atlantic Ridge), where heterogeneity of incompatible trace elements in olivine-hosted melt inclusions is more pronounced. We suggest that the low variability in incompatible trace element contents of olivine-hosted melt inclusions in near-primitive CFB rocks, and also ocean island basalts associated with moderately thick lithosphere (e.g. Hawaii, Gala ´pagos, Samoa), may re?ect mixing along their longer transport pathways during ascent and/or a temperature contrast between the liquidus and the liquid when it arrives in the crust. These thermal paths promote mixing of mantle melts prior to their entrapment by growing olivine crystals in crustal magma chambers. Olivine-hosted melt inclusions of ferropicrites from the Parana ´-Etendeka and Karoo CFB have the least variable compositions of all global melt inclusion suites, which may be a function of their unusually deep origin and low viscosity.
DS201909-2099
2019
Heinonen, J.S.Turunen, S.T., Luttinen, A.V., Heinonen, J.S., Jamal, D.L.Luenha picrites, central Mozambique - messengers from a mantle plume source of Karoo continental flood basalts?Lithos, Vol. 346-347, 16p. PdfAfrica, Mozambiquepicrites

Abstract: We present geochemical and isotopic (Nd, Sr) data for a picrite lava suite from the Luenha River and adjacent areas in Mozambique. The Luenha picrites represent a previously unknown type of picrites related to the Karoo large igneous province (LIP) and are distinguished by their notably low TiO2 contents (0.3-1.0?wt%) and coupling of high Nb/Y with low Zr/Y and Sm/Yb. Relatively high CaO and low Zn/Fe point to a peridotitic mantle source. Contamination-sensitive incompatible element ratios show that one lava flow is likely to be uncontaminated by the crust and its composition suggests a mantle source with primitive mantle-like incompatible element ratios and mildly depleted isotopic ratios (initial 87Sr/86Sr?=?0.7041 and eNd?=?+1.4 at 180?Ma). The primary melts of the Luenha picrites had MgO contents in the range of 13-21?wt%. Our preferred estimate for a primary melt composition (MgO?=?18?wt%) resembles experimental melts of fertile mantle peridotite at 3-4?GPa and indicates liquidus temperature of 1445-1582?°C. Geochemical similarities suggest the Luenha picrites were generated from the same overall primitive mantle-like reservoir that produced the main volume of Karoo flood basalts in the Karoo, Kalahari, and Zambezi basins, whereas the previously identified enriched and depleted (upper) mantle sources of Karoo picrite suites (Mwenezi, Antarctica) were subordinate sources for flood basalts. We propose that the Luenha picrites record melting of a hot, chemically primitive mantle plume source that may have been rooted in the sub-African large low shear velocity province boundary and that such a source might have been the most significant magma source in the Karoo LIP.
DS202008-1405
2020
Heinonen, J.S.Kara, J., Vaisanen, M., Heinonen, J.S., Lahaye, Y., O'Brien, H., Huhma, H.Tracing arcologites in the Paleoproteroic era - a shift from 1.88 Ga calc-alkaline to 1.86 Ga high-Nb and adakite-like magmatism in central Fennoscandian shield.Lithos, in press available, 68p. PdfEurope, Fennoscandiaalkaline
DS2002-0639
2002
HeinrichHalter, W.E., Pettke, T., Heinrich, RothenRutishauserMajor to trace element analysis of melt inclusions by laser ablation ICP MS methods of quantification.Chemical Geology, Vol.183, 1-4, pp.63-86.MantleMelt, Geochemistry - techniques, Inductively Coupled Plasma- Mass
DS1960-0679
1966
Heinrich, .W.Heinrich, .W., Dahlem, D.H.Carbonatites and Alkalic Rocks of the Arkansaw River Area, Fremont county, Colorado.Mineralogical Society of India 4TH. VOLUME., PP. 37-44.United States, Colorado PlateauBlank
DS2002-0695
2002
Heinrich, C.A.Heinrich, C.A., Neubauer, F.Cu au Pb Zn Ag metallogeny of the Alpine Balkan Carpathian Dinaride geodynamic Province.Mineralium deposita, EuropeCopper, gold, lead, zinc, silver, Deposit - Dinaride area
DS200612-0559
2006
Heinrich, C.A.Heinrich, C.A.From fluid inclusion microanalysis to large scale hydrothermal mass transfer in the Earth's interior.International Mineralogical Association 19th. General Meeting, held Kobe, Japan July 23-28 2006, Abstract p.MantleMelt inclusions
DS1960-0680
1966
Heinrich, E.W.Heinrich, E.W.The Geology of CarbonatitesChicago: Rand Mcnally, 555P. INDIA PP. 553-570.United States, Canada, South Africa, Russia, Greenland, India, Brazil, EuropeBlank
DS1960-0731
1966
Heinrich, E.W.Quon, S.H., Heinrich, E.W.Abundance and Significance of Some Minor Elements in Carbonatites Calcites and Dolomites.India Mineralogical Society Volume, Edited By P.r.j. Naidu, Proceedings 4TH. GENERAL MEETING, PP. 29-36.IndiaRelated Rocks
DS1960-0840
1967
Heinrich, E.W.Heinrich, E.W., Dahlem, D.H.Carbonatites and Alkalic Rocks of the Arkansaw River Area, Fremont county, Colorado. Part 4. the Pinon Peak Breccia Pipes.American Mineralogist., Vol. 52, No. 5-6, PP. 817-831.United States, Colorado, Rocky MountainsDiatreme
DS1975-0659
1978
Heinrich, E.W.Alexander, D.H., Heinrich, E.W.Geology and Petrogenesis of the Mcclure Mountains Mafic Alkalic Carbonatitic Complex, Fremont County, Colorado.Geological Society of America (GSA), Vol. 10, No. 6, P. 245. (abstract.).United States, Colorado, Rocky MountainsCarbonatite
DS1975-0660
1978
Heinrich, E.W.Alexander, D.H., Heinrich, E.W.Geology and Petrogenesis of the Mcclure Mountain Mafic Alkalic Carbonatitic Complex, Fremont County, Colorado.Geological Society of America (GSA), Vol. 10, No. 6, P. 245. (abstract.).United States, Colorado, Rocky MountainsBlank
DS1981-0214
1981
Heinrich, E.W.Heinrich, E.W.Mineral Deposits of Alkalic RocksGeological Society of America (GSA), Vol. 13, No. 6, MARCH P. 281. (abstract.).GlobalBlank
DS1994-1534
1994
Heinrich, W.Schaaf, P., Heinrich, W.Geochemical, Strontium-neodymium isotopic and P T dat a on a central Mexican xenolith suite: crustal compositions.Mineralogical Magazine, Vol. 58A, pp. 803-804. AbstractMexicoXenboliths, San Luis Potosi field
DS200912-0808
2009
Heinrich, W.Watenphu, A., Wunder, B., Heinrich, W.High pressure ammonium bearing silicates: implications for nitrogen and hydrogen storage in Earth's mantle.American Mineralogist, Vol. 94, 2-3, pp. 283-292.MantleUHP
DS201504-0184
2015
Heinrich, W.Berryman, E.J., Wunder, B., Wirth, R., Rhede, D., Schettler, G., Franz, G., Heinrich, W.An experimental study on K and Na in corporation in dravitic tourmaline and insight into the origin of Diamondiferous tourmaline from the Kokchetav Massif, Kazakhstan.Contributions to Mineralogy and Petrology, Vol. 169, 19p.Russia, KazakhstanDiamondiferous tourmaline

Abstract: Tourmaline was synthesized in the system MgO-Al2O3-B2O3-SiO2-KCl-NaCl-H2O from an oxide mixture and excess fluid at 500-700 °C and 0.2-4.0 GPa to investigate the effect of pressure, temperature, and fluid composition on the relative incorporation of Na and K in dravitic tourmaline. Incorporation of K at the X-site increases with pressure, temperature, and KCl concentration; a maximum of 0.71 K pfu (leaving 0.29 X-vacant sites pfu) was incorporated into K-dravite synthesized at 4.0 GPa, 700 °C from a 4.78 m KCl, Na-free fluid. In contrast, Na incorporation depends predominately on fluid composition, rather than pressure or temperature; dravite with the highest Na content of 1.00 Na pfu was synthesized at 0.4 GPa and 700 °C from a 3.87 m NaCl and 1.08 m KCl fluid. All synthesized crystals are zoned, and the dominant solid solution in the Na- and K-bearing system is between magnesio-foitite [?(Mg2Al)Al6Si6O18(BO3)3(OH)3OH] and dravite [NaMg3Al6Si6O18(BO3)3(OH)3(OH)], with the dravitic component increasing with the concentration of Na in the fluid. In the K-bearing, Na-free system, the dominant solid solution is between magnesio-foitite and K-dravite [KMg3Al6Si6O18(BO3)3(OH)3(OH)], with the K-dravitic component increasing with pressure, temperature, and the concentration of K in the fluid. The unit-cell volume of tourmaline increases with K incorporation from 1555.1(3) to 1588.1(2) Å3, reflecting the incorporation of the relatively large K+ ion. Comparison of our results to the compositional data for maruyamaite (K-dominant tourmaline) from the ultrahigh-pressure rocks of the Kokchetav Massif in Kazakhstan suggests that the latter was formed in a K-rich, Na-poor environment at ultrahigh-pressure conditions near the diamond-stability field.
DS1991-0348
1991
Heinrichs, W.E.Davis, R.W., Heinrichs, W.E.Cross borehole seismic tomography applications to mineral developmentMining Engineering, Vol. 43, No. 8, August pp. 1051-1056GlobalGeophysics -seismic tomography, Overview
DS1989-0616
1989
Heinritzi, F.Heinritzi, F., Williams-Jones, A.E., Wood, S.A.Fluid inclusions in calcite and dolomite of the rare earth elements (REE)zone in the St. Honore carbonatite complex, QuebecGeological Association of Canada (GAC) Annual Meeting Program Abstracts, Vol. 14, p. A20. (abstract.)QuebecCarbonatite
DS1997-1004
1997
Heinsohn, W.D.Schmitz, M., Heinsohn, W.D., Schilling, F.R.Seismic gravity and petrological evidence for partial melt beneath the thickened Central Andean crustTectonophysics, Vol. 270, No. 3-4, March 15, pp. 313-South America, Bolivia, Chile, Brazil, AndesGeophysics - seismic, Mantle melt
DS2003-0862
2003
Heinson, G.Mahoney, S., James, P., Mauger, A., Heinson, G.Geologic and regolith mapping for mineral exploration in the Gawler Craton of SouthInternational Geoscience and Remote Sensing Symposium, Vol. 3, pp. III 1779-81. Ingenta 1034976078AustraliaRemote sensing
DS200412-1202
2003
Heinson, G.Mahoney, S., James, P., Mauger, A., Heinson, G.Geologic and regolith mapping for mineral exploration in the Gawler Craton of South Australia using Hyperion and other remote seInternational Geoscience and Remote Sensing Symposium, Vol. 3, pp. III 1779-81. Ingenta 1034976078AustraliaRemote sensing
DS200512-0416
2005
Heinson, G.Heinson, G., White, A.Electrical resistivity of the northern Australian lithosphere: crustal anisotropy or mantle heterogeneity?Earth and Planetary Science Letters, Vol. 232, 1-2, pp. 157-170.MantleGeophysics - seismics
DS200712-0668
2007
Heinson, G.Maier, R., Heinson, G., Thiel, S., Selway, K., Gill, R., Scroggs, M.A 3D lithospheric resistivity model of the Gawler Craton: southern Australia.Transactions of the Institution of Mining and Metallurgy, Vol. 116, 1, pp. 13-21.AustraliaGeophysics - resistivity
DS201312-0909
2013
Heinson, G.Thiel, S., Heinson, G.Electrical conductors in Archean mantle-result of plume interaction?Geophysical Research Letters, Vol. 40, 12, pp. 2947-2952.MantleHotspots
DS201612-2330
2016
Heinson, G.Robertson, K., Heinson, G., Thiel, S.Lithospheric reworking at the Proterozoic-Phanerozoic transition of Australia imaged using AuLAMP magnetotelluric data.Earth and Planetary Science Letters, Vol. 452, pp. 27-35.AustraliaGeophysics - magnetoctelluric
DS2002-0949
2002
Heintz, D.C.Linn, J.F., Heintz, D.C., Campbell, A.J., Devine, J.M., Mao, W.L., Shen, G.Iron nickel alloy in the Earth's coreGeophysical Research Letters, Vol. 29,10,May15,pp.108-MantleCore-mantle boundary
DS2002-0696
2002
Heintz, J.H.Heintz, J.H.Valuation of mineral interests in comdemnation casesSme Preprint, No. 02-074, 3p.United StatesLegal - brief overview, Economics - mineral interests, resources, reserves
DS2003-0573
2003
Heintz, M.Heintz, M., Vauchez, A., Assumpcao, M., Barruol, G., EgydioSilva, M.Shear wave splitting in SE Brazil: an effect of active or fossil upper mantle flow, orEarth and Planetary Science Letters, Vol. 211, 1-2, June 15, pp. 79-95.Brazil, south EastGeophysics - seismic anisotropy, crust mantle coupling
DS200412-0816
2003
Heintz, M.Heintz, M., Vauchez, A., Assumpcao, M., Barruol, G., EgydioSilva, M.Shear wave splitting in SE Brazil: an effect of active or fossil upper mantle flow, or both?Earth and Planetary Science Letters, Vol. 211, 1-2, June 15, pp. 79-95.South America, BrazilGeophysics - seismic anisotropy, crust mantle coupling
DS200512-0417
2005
Heintz, M.Heintz, M., De Bayle, E., Vauchez, A.Upper mantle structure of the South American continent and neighbouring oceans from surface wave tomography.Tectonophysics, Vol. 406, 1-2, pp. 115-139.South AmericaTomography
DS200512-0418
2005
Heintz, M.Heintz, M., Kennett, B.L.N.Continental scale shear wave splitting analysis: investigation of seismic anisotropy underneath the Australian continent.Earth and Planetary Science Letters, Advanced in press,AustraliaGeophysics - seismics, flow, coupling
DS200612-0049
2006
Heintz, M.Assumpcao, M., Heintz, M., Vauchez, A., Egydio Silva, M.Upper mantle anisotropy in SE and Central Brazil from SKS splitting: evidence of asthenospheric flow around a cratonic keel.Earth and Planetary Science Letters, Vol. 250, 1-2, pp. 224-240.South America, BrazilGeophysics - seismic, fast polarization
DS200612-0050
2006
Heintz, M.Assumpcao, M., Heintz, M., Vauchez, A., Silva, M.E.Upper mantle anisotropy in SE and Central Brazil from SKS splitting: evidence of asthenospheric flow around a cratonic keel.Earth and Planetary Science Letters, Vol.250, 1-2, pp. 224-240.South America, BrazilGeophysics - seismics
DS200612-0560
2006
Heintz, M.Heintz, M., Kennett, B.L.N.The apparently isotopic Australian upper mantle.Geophysical Research Letters, Vol. 33, 15, August 16, L15319AustraliaGeochronology
DS200812-0354
2008
Heintz, M.Fishwick, S., Heintz, M., Kennett, B.L.N., Reading, A.M., Yoshizawa, K.Steps in lithospheric thickness within eastern Australia, evidence from surface wave tomography.Tectonics, Vol. 27, TC 4009AustraliaTomography
DS200912-0292
2009
Heintz, M.Heintz, M., Kumar, V.P., Gaur, V.K., Priestly, K., Rai, S.S., Prakasam, K.S.Anisotropy of the Indian continental lithospheric mantle.Geophysical Journal International, Vol. 179, 3, pp. 1341-1360.IndiaGeodynamics
DS201012-0442
2010
Heintzman, R.Liaugaudas, G., Collins, A.T., Suhling, K., Davies, G., Heintzman, R.Luminescence - life time mapping in diamond.Journal of Physics Condensed Matter, Vol. 21, 36, pp. 364210-216.TechnologyDiamond crystallography
DS1990-0263
1990
Heinz, D.L.Campbell, A.J., Heinz, D.L., Davis, A.M.Melt partioning behaviour in high pressurehases of natural olivineEos, Vol. 71, No. 17, April 24, p. 527 Abstract onlyArizonaSan Carlos, Olivine
DS1991-0699
1991
Heinz, D.L.Heinz, D.L.Split decision on the mantleNature, Vol. 351, May 30, pp. 346-347GlobalGeophysics, Mantle
DS1991-0700
1991
Heinz, D.L.Heinz, D.L.Geophysics - split decision on the mantleNature, Vol. 351, No. 6325, May 30, p. 346GlobalMantle, Geophysics
DS1993-1562
1993
Heinz, D.L.Sweeney, J.S., Heinz, D.L.Melting of iron magnesium silicate perovskiteGeophysical Research Letters, Vol. 20, No. 9, May 7, pp. 855-858.GlobalMineralogy
DS1994-0753
1994
Heinz, D.L.Heinz, D.L., et al.high pressure melting of (Mg, Fe) SiO3 perovskiteScience, Vol. 264, April 8, pp. 279-281.GlobalPerovskite, magnesium, iron
DS1995-0784
1995
Heinz, D.L.Heinz, D.L.New phase for mantle researchNature, Vol. 374, No. 6519, March 16, p. 216.MantleGeophysics
DS1998-1332
1998
Heinz, D.L.Shen, G., Heinz, D.L.high pressure melting of deep mantle and core materialsReviews in Mineralogy, Vol. 37, pp. 369-96.MantleMineralogy, Geodynamics - boundary
DS2003-0819
2003
Heinz, D.L.Lin, J.F., Heinz, D.L., Mao, H., Hemley, R.J., Devine, J.M., Shen, G.Stability of magnesiowurstite in Earth's lower mantleProceedings of the National Academy of Sciences, USA, Vol. 100, 8, pp. 4405-8.MantlePetrology
DS200412-1138
2003
Heinz, D.L.Lin, J.F., Heinz, D.L., Mao, H., Hemley, R.J., Devine, J.M., Shen, G.Stability of magnesiowurstite in Earth's lower mantle.Proceedings of National Academy of Science USA, Vol. 100, 8, pp. 4405-8.MantlePetrology
DS1970-0092
1970
Heinz, L.A.Heinz, L.A.Afrique du SudUsine Nouv. Fr., Vol. 12, No. 50, PP. 101-105.South AfricaGeology
DS2003-0574
2003
Heinz, M.Heinz, M., Vauchez, A., Asuumpcao, M., Barruol, G., Egydio Silva, M.Shear wave splitting in SE Brazil: an effect of active or fossil upper mantle flow or both?Earth and Planetary Science Letters, Vol. 211, 1-2, pp. 79-95.BrazilBlank
DS1930-0109
1932
Heinz, R.Heinz, R.Ein Vorzeitlicher Traenkplatz Auf Den Diamant feldern Bei Luederitzbucht in Deutsch Suedwest Afrika und Seine Bedeutung Fuer die Geschnichte der Namibwueste.Geol. Deutsch. Fur Gesell., Vol. 84, P. 569. (abstract.).Southwest Africa, NamibiaDiamond Deposits
DS1930-0139
1933
Heinz, R.Heinz, R.Ein Vorzeitlicher Tranekplatz in der Namibwueste Bei Luderitzbucht ( Deutsch Suedwest Afrika). Mit Bemerkungen Zum Problem des Atlantis chen ozeans.Mitt. Geogr. Ges. Hamb., Vol. 43, PP. 267-302.Southwest Africa, NamibiaLittoral Diamond Placers
DS200612-0561
2006
Heir Majumder, C.A.Heir Majumder, C.A., Travis, B.J., Belanger, E., Richard, G., Vincent, A.P., Yuen, D.A.Efficient sensitivity analysis for flow and transport in the Earth's crust and mantle.Geophysical Journal International, Vol. 166, 2, pp. 907-922.MantleGeophysics - seismics
DS201112-0428
2011
Heir-Majumber, S.Heir-Majumber, S.Development of anisotropic mobility during two phase flow.Geophysical Journal International, In press availableMantleMagmatism - shapes
DS1994-0754
1994
Heirtzler, J.R.Heirtzler, J.R., Frawley, J.J.New gravity model for earth science studiesGsa Today, Vol. 4, No. 11, November pp. 269, 270.GlobalGeophysics -gravity
DS1989-0617
1989
Heise, H.Heise, H.Diamonds? take a look next doorCalgary Herald, Sat. April 1, 1 pgSaskatchewanNews item
DS1989-0618
1989
Heise, H.Heise, H.High tech helps diamond searchCalgary Herald, Sun. April 2, 1 pgSaskatchewanNews item
DS1991-1252
1991
Heiskanen, K.I.Ojakangas, R.W., Heiskanen, K.I.Early Proterozoic glaciogenic deposits: a North America -balticconnection?Minnesota Geological Survey, Information Circular No. 34, pp. 83-91Minnesota, RussiaGeomorphology, Glacial deposits
DS1998-0603
1998
Heisler, S.I.Heisler, S.I.Wiley's engineer's desk referenceWiley-Interscience, $ 75.00 second editionGlobalBook - ad, Mining engineering - manual
DS200512-0419
2005
Heister, L.E.Heister, L.E., Lesher, C.E.Mantle redox conditions in LIPs: constraints from the North Atlantic igneous province.Chapman Conference held in Scotland August 28-Sept. 1 2005, 1p. abstractMantleMantle plume, tectonics, rifting
DS200512-0620
2005
Heister, L.E.Lesher, C.E., Brown, E.L., Heister, L.E.Paleogene North Atlantic Igneous Province and the Iapetus connection.Chapman Conference held in Scotland August 28-Sept. 1 2005, 1p. abstractMantle, Europe, Iceland, GreenlandMantle plume
DS201212-0382
2012
Heister, T.Kronbichler, M., Heister, T., Bangeth, W.High accuracy mantle convection simulation through numerical methods.Geophysical Journal International, in press availableMantleConvection
DS201412-0149
2014
Heister, T.Cottaar, S., Heister, T., Rose, I., Unterborn, C.BurnMan: a lower mantle mineral physics toolkit.Geochemistry, Geophysics, Geosystems: G3, Vol. 15, 4, pp. 1164-1179.MantleTechnology
DS1994-1253
1994
Heithersay, P.S.Muller, D., Heithersay, P.S., Groves, D.I.The shoshonite porphyry copper _ gold association in the Goonumbia district. New South WalesMineralogy and Petrology, Vol. 51, No. 2-4, pp. 299-322AustraliaCopper, gold, porphyry, Deposit -Goonumbia
DS200512-1153
2004
Heithersay, P.S.Vos, I.M.A., Bierlein, F.P., Heithersay, P.S., Lister, G.S.The 440 Ma event: a continental scale, mantle driven thermal phenomenon?Geological Society of America Abstracts, Vol. 74, pp. 141-145.MantleGeothermometry
DS1992-0626
1992
Heizler, M.T.Grunow, A.M., Dalziel, I.W.D., Harrison, T.M., Heizler, M.T.Structural geology and geochronology of subduction complexes along the margin of Gondwanaland: new dat a from the Antarctic Peninsula and southernmostAndesGeological Society of America (GSA) Bulletin, Vol. 104, No. 11, November pp. 1497-1514Andes, AntarcticaStructure, Geochronology
DS2000-1004
2000
Heizler, M.T.Wannamker, P.E., Hulen, J.B., Heizler, M.T.Early Miocene lamproite from the Colorado Plateau tectonic province, southeastern Utah, USAJournal of Volc. Geotherm. Res., Vol. 96, No. 3-4, Mar. pp. 175-90.Utah, Colorado PlateauLamproite
DS200712-0955
2007
Heizler, M.T.Schneider, D.A., Heizler, M.T., Bickford, M.E., Wortman, G.L., Condie, K.C., Perilli, S.Timing constraints of orogeny to cratonization: thermochronology of the Paleoproterozoic Trans-Hudson orogen, Manitoba and Saskatchewan, Canada.Precambrian Research, Vol. 153, 1-2, pp. 65-95.Canada, Manitoba, SaskatchewanGeothermometry
DS1985-0737
1985
Hejna, C.I.Wong, J., Koch, E.F., Hejna, C.I., Garbauskas, M.F.Atomic and microstructural characterization of metal impurities in synthetic diamondsJournal of Applied Physics, Vol. 58, No. 9, Nov. 1, pp. 3388-3393GlobalDiamond Morphology
DS1985-0738
1985
Hejna, C.L.Wong, J., Koch, E.F., Hejna, C.L., Garbausk, M.F.Atomic and Microstructural Characterization of Metal Impurities in Synthetic Diamonds.Journal of APPLIED PHYSICS, Vol. 58, No. 9, Nov. 1, PP. 3388-3393.GlobalSynthetic Diamond
DS201912-2824
2019
Hekinian, R.Shimizu, K., Saal, A.E., Hauri, E.H., Perfit, M.R., Hekinian, R.Evaluating the roles of melt rock interaction and partial degassing on the CO2/Ba ratios of MORB: implications of the CO2 budget in the Earth's depleted upper mantle.Geocimica et Cosmochimica Acta , Vol. 260, pp. 29-48.Mantlemelting

Abstract: Carbon content in the Earth's depleted upper mantle has been estimated in previous studies using CO2/Ba ratios of CO2 undersaturated depleted mid-ocean ridge basalt (D-MORB) glasses and melt inclusions. However, CO2/Ba ratios in CO2 undersaturated MORB may not necessarily record those of the mantle source, as they may be affected by (1) assimilation of Ba-rich plagioclase-bearing rocks in the oceanic crust and (2) CO2 degassing through partial degassing and mixing. In this study, we evaluate these effects on the CO2/Ba ratios as well as other volatile to refractory trace element ratios (H2O/Ce, F/Nd, Cl/K, and S/Dy) in D-MORBs using the compositions of olivine-hosted melt inclusions and glasses from the Siqueiros and Garrett transform faults. The Siqueiros and Garrett melt inclusions are CO2 undersaturated and highly depleted in incompatible trace elements, and their average CO2/Ba ratios show relatively large ranges of 90?±?34 and 144?±?53 respectively. A subset of melt inclusions in lavas from both transform faults show potential signatures of contamination by plagioclase-rich rocks, such as correlations between major elements contents (e.g., FeO, Al2O3, and MgO), and trace element ratios (e.g., Sr/Nd). We find that (1) assimilation fractional crystallization (AFC) of gabbro into D-MORB and (2) mixing between partial melts of gabbro and D-MORB can reproduce the observed range in Sr/Nd ratios as well as the general trends between major elements. However, we find that these processes had limited effects on the CO2/Ba ratio of the melt inclusions and it is unlikely that they can account for the observed range in the CO2/Ba ratio. On the other hand, while a partial degassing and mixing model can generate melts with large range of CO2/Ba ratios (as proposed by Matthews et al. (2017)), it cannot reproduce the Pearson correlation coefficients between CO2/trace element and 1/trace element ratios observed in the Siqueiros and Garrett melt inclusions. Instead, when analytical uncertainties on the elemental concentrations are considered, a model without partial degassing can adequately reproduce the majority of the observed range in CO2/Ba ratio and Pearson correlation coefficients. Hence, we postulate that the Siqueiros and Garrett melt inclusions are undegassed and use their average CO2/Ba ratios to estimate the Siqueiros and Garrett mantle source CO2 contents (21?±?2?ppm and 33?±?6?ppm respectively). We also evaluate the effects of shallow level crustal processes on H2O/Ce, F/Nd, Cl/K, and S/Dy ratios, and after which we filter those effects, we estimate the H2O, F, Cl and S contents in the mantle sources of the Siqueiros (40?±?8?ppm, 8?±?1?ppm, 0.22?±?0.04?ppm, and 113?±?3?ppm) and Garrett (51?±?9?ppm, 6?±?1?ppm, 0.27?±?0.07?ppm, and 128?±?7?ppm) melt inclusions.
DS200712-1017
2007
Helberger, D.V.Song, T-R.A., Helberger, D.V.A depleted destabilized continental lithosphere near the Rio Grande Rift.Earth and Planetary Science Letters, Vol. 262, 1-2, pp. 175-184.United States, Colorado PlateauTectonics
DS1993-0648
1993
Helden, G. vonHelden, G. von, Gotts, N.G., Bowers, M.T.Experimental evidence for the formation of fullerenes by collisional heating of carbon rings in the gas phaseNature, Vol. 363, No. 6424, May 6, pp. 60-63GlobalCVD.
DS201012-0786
2010
Helffich, G.Thompson, D.A., Bastow, I.D., Helffich, G., Kendall, J.M., Wookey, J., Snyder, D.B., Eaton, D.W.Precambrian crustal evolution: seismic constraints from the Canadian Shield.Earth and Planetary Science Letters, Vol. 297, 3-4, pp. 655-666.CanadaGeophysics - seismics
DS201112-1039
2011
Helffich, G.Thompson, D.A., Helffich, G., Bastow, L.D., Kendall, J-M., Wookey, J., Eaton, D.W., Snyder, D.B.Implications of a simple mantle transition zone beneath cratonic North America.Earth and Planetary Science Letters, Vol. 312, pp. 28-36.Canada, United StatesCraton, convective flow
DS1990-1576
1990
Helffrich, G.Wood, B., Helffrich, G.Earth sciences: internal structure of the earthNature, Vol. 344, No. 6262, March 8, p. 106GlobalMantle, Tectonics
DS1998-0604
1998
Helffrich, G.Helffrich, G., Kaneshima, S.Small scale lower mantle heteorgeneites as geochemical reservoirsMineralogical Magazine, Goldschmidt abstract, Vol. 62A, p. 597.MantleGeochemistry, Subduction
DS2002-0697
2002
Helffrich, G.Helffrich, G.Chemical and seismological constraints on mantle heterogeneityPhilosophical Transactions, Royal Society of London Series A Mathematical, Vol.1800, pp. 2493-2506.MantleGeophysics - seismic, geochemistry
DS2002-0698
2002
Helffrich, G.Helffrich, G., Wiens, Vera, Barrientos, Shore ..A teleseismic shear wave splitting study to investigate mantle flow around South AfricaGeophysical Journal International, Vol.149,1,pp.F1-7., Vol.149,1,pp.F1-7.MantleGeophysics - seismics
DS2002-0699
2002
Helffrich, G.Helffrich, G., Wiens, Vera, Barrientos, Shore ..A teleseismic shear wave splitting study to investigate mantle flow around South AfricaGeophysical Journal International, Vol.149,1,pp.F1-7., Vol.149,1,pp.F1-7.MantleGeophysics - seismics
DS2003-0042
2003
Helffrich, G.Asencio, E., Knapp, J.H., Owens, T.J., Helffrich, G.Mapping fine scale heterogeneities within the continental mantle lithosphere beneathGeology, Vol. 31, 6, pp. 477-80.ScotlandTectonics
DS2003-0688
2003
Helffrich, G.Kaneshima, S., Helffrich, G.Subparallel dipping heterogeneities in the mid lower mantleJournal of Geophysical Research, Vol. 108, 5, ETG3 DOI 10.1029/2002JB001596MantleGeophysics - seismics
DS200412-0062
2003
Helffrich, G.Asencio, E., Knapp, J.H., Owens, T.J., Helffrich, G.Mapping fine scale heterogeneities within the continental mantle lithosphere beneath Scotland: combining active and passive sourGeology, Vol. 31, 6, pp. 477-80.Europe, ScotlandGeophysics - seismics Tectonics
DS200412-0951
2003
Helffrich, G.Kaneshima, S., Helffrich, G.Subparallel dipping heterogeneities in the mid lower mantle.Journal of Geophysical Research, Vol. 108, 5, ETG3 DOI 10.1029/2002 JB001596MantleGeophysics - seismics
DS200612-0562
2006
Helffrich, G.Helffrich, G.Heterogeneity in the mantle - its creation, evolution and destruction.Tectonophysics, Vol. 416, 1-4, April 5, pp. 23-31.MantleGeophysics - seismics
DS200612-1196
2006
Helffrich, G.Saalmann, Helffrich, G.Small scale seismic heterogeneity and mantle structure.Astronomy and Geophysics, Vol. 47, 1., pp.1.20-1.26.MantleGeophysics - seismics
DS200712-0110
2007
Helffrich, G.Brodholt, J.P., Helffrich, G., Trampert, J.Chemical versus heterogeneity in the lower mantle: the most likely role of anelasticity.Earth and Planetary Science Letters, Vol. 262, 3-4, Oct. 30, pp. 429-437.MantleGeochemistry
DS201112-0066
2011
Helffrich, G.Bastow, I.D., Thompson, D.A., Wookey, J., Kendall, J-M., Helffrich, G., Snyder, D.B., Eaton, D.W., Darbyshire, F.A.Precambrian plate tectonics: seismic evidence from northern Hudson Bay, Canada.Geology, Vol. 39, 1, pp. 91-94.Canada, Ontario, Quebec, Manitoba, Northwest TerritoriesGeophysics - seismics
DS201112-0772
2010
Helffrich, G.Pawlak, A., Eaton, D.W., Bastow, I.D., Kendall, J-M., Helffrich, G., Wookey, J., Snyder, D.Crustal structure beneath Hudson Bay from ambient noise tomography: implications for basin formation.Geophysical Journal International, Vol. 184, 1, pp. 65-82.Canada, Ontario, Quebec, James Bay LowlandsGeophysics -
DS201212-0291
2012
Helffrich, G.Helffrich, G.How light element addition can lower core liquid wave speed.Geophysical Journal International, in press availableMantleChemistry
DS201503-0136
2015
Helffrich, G.Bastow, I.D., Eaton, D.W., Kendall, J-M., Helffrich, G., Snyder, D.B., Thompson, D.A., Wookey, J., Darbyshire, F.A., Pawlak, A.E.The Hudson Bay lithospheric experiment ( HuBLE): insights into Precambrian plate tectonics and the development of mantle keels.Geological Society of London Special Publication: Continent formation through time., No. 389, pp. 41-67.Canada, Ontario, QuebecGeotectonics

Abstract: Hudson Bay Lithospheric Experiment (HuBLE) was designed to understand the processes that formed Laurentia and the Hudson Bay basin within it. Receiver function analysis shows that Archaean terranes display structurally simple, uniform thickness, felsic crust. Beneath the Palaeoproterozoic Trans-Hudson Orogen (THO), thicker, more complex crust is interpreted as evidence for a secular evolution in crustal formation from non-plate-tectonic in the Palaeoarchaean to fully developed plate tectonics by the Palaeoproterozoic. Corroborating this hypothesis, anisotropy studies reveal 1.8 Ga plate-scale THO-age fabrics. Seismic tomography shows that the Proterozoic mantle has lower wavespeeds than surrounding Archaean blocks; the Laurentian keel thus formed partly in post-Archaean times. A mantle transition zone study indicates ‘normal’ temperatures beneath the Laurentian keel, so any cold mantle down-welling associated with the regional free-air gravity anomaly is probably confined to the upper mantle. Focal mechanisms from earthquakes indicate that present-day crustal stresses are influenced by glacial rebound and pre-existing faults. Ambient-noise tomography reveals a low-velocity anomaly, coincident with a previously inferred zone of crustal stretching, eliminating eclogitization of lower crustal rocks as a basin formation mechanism. Hudson Bay is an ephemeral feature, caused principally by incomplete glacial rebound. Plate stretching is the primary mechanism responsible for the formation of the basin itself.
DS201603-0379
2015
Helffrich, G.Goncharov, A.F., Lobanov, S.S., Tan, X., Hohensee, G.T., Cahill, D.G., Lin, J-F., Thomas, S-M., Okuchi, T., Tomioka, N., Helffrich, G.Experimental study of thermal conductvity at high pressures: implication for the deep Earth's interior.Physics of the Earth and Planetary Interiors, Vol. 247, pp. 11-16.MantleExperimental Petrology

Abstract: Lattice thermal conductivity of ferropericlase and radiative thermal conductivity of iron bearing magnesium silicate perovskite (bridgmanite) - the major mineral of Earth’s lower mantle- have been measured at room temperature up to 30 and 46 GPa, respectively, using time-domain thermoreflectance and optical spectroscopy techniques in diamond anvil cells. The results provide new constraints for the pressure dependencies of the thermal conductivities of Fe bearing minerals. The lattice thermal conductivity of ferropericlase Mg0.9Fe0.1O is 5.7(6) W/(m * K) at ambient conditions, which is almost 10 times smaller than that of pure MgO; however, it increases with pressure much faster (6.1(7)%/GPa vs 3.6(1)%/GPa). The radiative conductivity of a Mg0.94Fe0.06SiO3 bridgmanite single crystal agrees with previously determined values for powder samples at ambient pressure; it is almost pressure-independent in the investigated pressure range. Our results confirm the reduced radiative conductivity scenario for the Earth’s lower mantle, while the assessment of the heat flow through the core-mantle boundary still requires in situ measurements at the relevant pressure-temperature conditions.
DS2001-0201
2001
Helffrich, G.R.Collier, J.D., Helffrich, G.R., Woodm B.J.Seismic discontinuities and subduction zonesPhysics of the Earth and Planetary Interiors, Vol. 127, No. 1-4, Dec. 1, pp. 35-49.MantleGeophysics - seismics, Subduction
DS2001-0466
2001
Helffrich, G.R.Helffrich, G.R., Wood, B.J.The Earth's mantleNature, No. 8636, Aug. 2, pp. 501-7.MantlePetrology
DS200612-0198
2006
Helg, U.Burkhard, M., Caritag, S., Helg, U., Robert Charrue, C., Soulaimani, A.Tectonics of the Anti-Atlas of Morocco.Comptes Rendus Geoscience, Vol. 338, 1-2, pp. 11-24.Africa, MoroccoTectonics
DS200612-0199
2006
Helg, U.Burkhard, M., Caritg, S., Helg, U., Robert-Charrue, C., Soulainmani, A.Tectonics of the Anti-Atlas of Morocco.Comptes Rendus Geoscience, Vol. 338, 1-2, pp. 11-24.Africa, MoroccoTectonics
DS1970-0926
1974
Helgren, D.M.Helgren, D.M., Butzer, K.W.Alluvial Terraces of the Lower Vaal River, South Africa: a Reappraisal and Reinvestigation: a Reply.Journal of Geology, Vol. 82, PP. 665-667.South AfricaGeomorphology
DS1975-0759
1978
Helgren, D.M.Helgren, D.M.Environmental Stratigraphy of the Relict Alluvia and Terraces Along the Lower Vaal River, South Africa.Palaeoecology of Africa And The Surrounding Islands, Vol. 10, PP. 163-170.South AfricaGeomorphology
DS1975-1071
1979
Helgren, D.M.Helgren, D.M.River of Diamonds 1979Chicago: University Chicago Department Geography Res. Paper., No. 185, 389P.South AfricaKimberley, Janlib, Kimberlite, Fluvial, Geomorphology
DS200912-0334
2009
Helikkinen, P.Janik, T., Kozlovskaya, E., Helikkinen, P., Tliniemi, J.Evidence for preservation of crustal root beneath the Proterozoic Lapland-Kola orogen ( northern Fennoscandian shield) derived from P and S wave models.Journal of Geophysical Research, Vol. 114. B 6, B06308.Europe, Finland, Kola PeninsulaGeophysics - seismics
DS200412-1618
2003
Hell, A.Ramsay, W.R.H., Hell, A., Reinberger, G., Pooley, S.The geology, age, near surface features and mineralogy of the Merlin kimberlite field, Northern Territory, Australia.Geological Society of Australia Abstracts, Vol. 70, p. 54. 1p.Australia, Northern TerritoryDeposit overview - Merlin
DS2002-0700
2002
Hell, A.J.Hell, A.J.The stratigraphy and structural framework of the Merlin diamond field, Northern Territory, Australia.Geological Society of Australia Abstracts, Vol. 67, p. 332. abstract.Australia, Northern TerritoryStratigraphy, structure, Deposit - Merlin
DS2003-0575
2003
Hell, A.J.Hell, A.J., Ramsay, W.R.H., Rheinberger, G., Pooley, S.The geology, age, mineralogy and near surface features of the Merlin kimberlites8ikc, Www.venuewest.com/8ikc/program.htm, Session 1 POSTER abstractAustraliaKimberlite geology and economics, Deposit - Merlin
DS2003-1146
2003
Hell, A.J.Reddicliffe, T.H., Jakimowicz, J., Hell, A.J., Robins, J.A.The geology, mineralogy and near surface chacteristics of the Ashmore and Seppelt8ikc, Www.venuewest.com/8ikc/program.htm, Session 1 POSTER abstractAustraliaKimberlite geology and economics, Deposit - Ashmore, Seppelt
DS201810-2336
2018
Hell, J.V.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.
DS1997-0499
1997
Hellam, A.Hellam, A., Wignall, P.Mass extinctions and their aftermathOxford University of Press, 320p. $ 85.00GlobalBook - ad, Extinctions - review of evidence
DS1920-0338
1927
Hellawell, A.Hellawell, A.The Story of the Diamond (1927)Min. Ind. Magazine (johannesburg), Vol. 5, SEPT. 21ST. P. 63; Oct. 10TH. PP. 135-136; Nov. 2ND.South AfricaHistory, Geology
DS200712-0220
2007
HellebrandDavies, G.R., Wasch, L., Van der Zwan, F., Morel, M.L.A., Nebel, Van Westrenen, Pearson, HellebrandThe origin of silica rich Kaapvaal lithospheric mantle.Plates, Plumes, and Paradigms, 1p. abstract p. A205.Africa, South AfricaDeposit - Kimberley
DS2002-0701
2002
Hellebrand, E.Hellebrand, E., Snow, J.E., Muhe, R.Mantle melting beneath Gakkel Ridge ( Arctic Ocean): abyssal peridotite spinel compositions.Chemical Geology, Vol.182, 2-4, Feb.15, pp.227-55.Arctic OceanPeridotites
DS200612-0623
2006
Hellebrand, E.Ionov, D.A., Hofmann, A.W., Merlet, C., Gurenko, A.A., Hellebrand, E., Montagnac, G., Gillet, P., PrikhodkoDiscovery of whitlockite in mantle xenoliths: inferences for water and halogen poor fluid and trace element residence in the terrestrial upper mantle.Earth and Planetary Science Letters, Vol. 244, 1-2, Apr. 15, pp. 201-207.MantleXenolith - mineralogy
DS200612-0650
2006
Hellebrand, E.Jung, S., Hellebrand, E.Trace element fractionation during high grade metamorphism and crustal melting - constraints from ion microprobe dat a of metapelitic, migmatitic and igneous garnets and implications for Sn Nd garnet chronologyLithos, Vol. 87, 1-4, April pp. 193-213.AfricaDamara Orogeny, geochronology Sm-Nd garnet chronology
DS200612-0938
2006
Hellebrand, E.Mocek, B., Hellebrand, E.REE concentrations of cpx and grt of mantle peridotites: new distribution coefficients from South Africa lherzolites.Geochimica et Cosmochimica Acta, Vol. 70, 18, p. 424. abstract only.Africa, South AfricaGeochemistry - REE
DS200612-1523
2006
Hellebrand, E.Weyer, S., Ionov, D.A., Hellebrand, E., Woodland, A.B., Brey, G.P.Iron isotope fractionation as indicator of mantle processes.Geochimica et Cosmochimica Acta, Vol. 70, 18, p. 16 abstract only.MantleGeochemistry - iron
DS200712-0737
2007
Hellebrand, E.Mocek, B., Hellebrand, E., Ionov, D.In situ measurements vs. lattice strain model calculations: distribution of REE between Grt and Cpx in garnet peridotites from Vitim ( Siberia).Plates, Plumes, and Paradigms, 1p. abstract p. A677.Russia, SiberiaVitim
DS201112-1009
2011
Hellebrand, E.Stracke, A., Snow, J.E., Hellebrand, E., Von der Handt, A., Bourdon, B., Birbaum, K., Gunther, D.Abyssal peridotite Hf isotopes identify extreme mantle depletion.Earth and Planetary Science Letters, Vol. 308, 3-4, pp. 359-368.Mantle, Europe, GreenlandGeochronology
DS201112-1010
2011
Hellebrand, E.Stracke, A., Snow, J.E., Hellebrand, E., Von der Handt, A., Bourdon, B., Birbaum, K., Guther, D.Abyssal peridotite Hf isotopes identify extreme mantle depletion.Earth and Planetary Science Letters, Vol. 308, 3-4, pp. 359-368.OceanGakkel Ridge
DS200912-0807
2009
Hellebrand, E.W.G.Wasch, L.J., Van der Zwan, F.M., Nebel, O., Morel, M.L.A., Hellebrand, E.W.G., Pearson, D.G., Davies, G.R.An alternative model for silica enrichment in the Kaapvaal subcontinental lithospheric mantle.Geochimica et Cosmochimica Acta, Vol. 73, 22, pp. 6894-6917.MantleMelting
DS1999-0465
1999
Heller, P.L.McMillan, M.E., Heller, P.L., Hoffower, BlackstoneIs there a northern boundary of the Colorado Plateau?Geological Society of America (GSA), Vol. 31, No. 7, p. 187. abstract.Alberta, WyomingTectonics
DS2003-0833
2003
Heller, P.L.Liu, S., Heller, P.L., Zhang, G.Mesozoic basin development and tectonic evolution of the Dabie Shan orogenic beltTectonics, Vol. 22, 4, August, 10.1029/2002TC001390ChinaTectonics, UHP
DS200412-1160
2003
Heller, P.L.Liu, S., Heller, P.L., Zhang, G.Mesozoic basin development and tectonic evolution of the Dabie Shan orogenic belt, central China.Tectonics, Vol. 22, 4, August, 10.1029/2002 TC001390ChinaTectonics UHP
DS1991-0701
1991
Hellfrich, G.Hellfrich, G., Brodholt, J.Relationship of deep seismicity to the thermal structure of subductedlithosphere.Nature, Vol. 353, Sept. 19, pp. 252-5.MantleSubduction, mantle structure, Geophysics - seismics
DS2002-0702
2002
Hellman, R.Hellman, R., Wood, S.A.Water rock interactions, ore deposits and environmental geochemistry: a tribute to David A. Crerar.http://gs.wustl.edu/publications/#SPS, SP #7, $80.GlobalBook - ore deposits, environment
DS200812-0805
2008
Helman, C.Nowicki, T., Helman, C., Gurney, J., Van Coller, B., Galloway, M., Smith, C., Mukodzani, B.Optimizing kimberlite evaluation programs by integrating geological, mineralogical and geophysical data.GSSA-SEG Meeting Held July, Johannesburg, 19 Power point slidesTechnologyEvaluation
DS2000-0404
2000
Helmberger, D.Helmberger, D., NI, S., Ritsema, J.Seismic evidence for ultralow velocity zones beneath Africa and eastern Atlantic.Journal of Geophysical Research, Vol. 105, No.B 10, Oct.10, pp.23865-78.AfricaGeophysics - seismics
DS2001-0769
2001
Helmberger, D.Melbourne, T., Helmberger, D.Mantle control of plate boundary deformationGeophysical Research Letters, Vol. 28, No. 20, Oct. 15, pp. 4003-6.MantleTectonics, Core mantle boundary
DS2002-0973
2002
Helmberger, D.Luo, S.N., Ni, S., Helmberger, D.Relationship of D structure with the velocity variations near the inner core boundaryGeophysical Research Letters, Vol. 29, 11, pp. 22- DOI 10.1029/2001GLO13907MantleGeophysics - seismics, Core-mantle boundary
DS200512-0778
2005
Helmberger, D.Ni, S., Helmberger, D., Tromp, J.Three dimensional structure of the African superplume from waveform modelling.Geophysical Journal International, Vol. 161, 2, pp. 283-294.AfricaGeophysics - seismics
DS200612-0563
2005
Helmberger, D.Helmberger, D., Lay, T., Ni, S., Gurnis, M.Deep mantle structure and the postperovskite phase transition.Proceedings of National Academy of Science USA, Vol. 102, no. 48, pp. 17257-283,MantleTectonics
DS200712-1051
2007
Helmberger, D.Sun, D., Tan, E., Helmberger, D., Gurnis, M.Seismological support for the metastable superplume model, sharp features, and phase changes within the lower mantle.Proceedings of National Academy of Sciences USA, Vol. 104, 22, pp. 9151-9155. IngentaMantleGeophysics - seismics
DS200812-1140
2008
Helmberger, D.Sun, D., Helmberger, D.Lower mantle tomography and phase mapping.Journal of Geophysical Research, Vol. 113, B10305.MantleGeophysics - seismics
DS200812-1141
2008
Helmberger, D.Sun, D., Helmberger, D.Lower mantle superdomes and plumes.Goldschmidt Conference 2008, Abstract p.A914.MantlePlume
DS200912-0293
2009
Helmberger, D.Helmberger, D., Sun, D., Lui, L., Tan, E., Gurnis, M.Review of large low shear veolocity provinces in the lower mantle.Goldschmidt Conference 2009, p. A520 Abstract.MantleCMB
DS200912-0741
2008
Helmberger, D.Sun, D., Helmberger, D.Lower mantle tomography and phase change mapping.Journal of Geophysical Research, Vol. 113, B10, B10305MantleGeophysics - seismics
DS201312-0376
2013
Helmberger, D.Helmberger, D., Chu, R., Leng, W., Gurnis, M.Hidden hotspot track beneath eastern United States.Goldschmidt 2013, AbstractUnited States, KentuckyKimberlite
DS201412-0128
2014
Helmberger, D.Chu, R., Helmberger, D.Lithospheric waveguide beneath the Midwestern United States; massive low-velocity zone in the lower crust.Geochemistry, Geophysics, Geosystems: G3, Vol. 15, 4, pp. 1348-1362.United StatesGeophysics - seismics
DS1989-0874
1989
Helmberger, D.V.LeFevre, L.V., Helmberger, D.V.Upper mantle P velocity structure of the Canadian shieldJournal of Geophysical Research, Vol. 94, No. B 12, December 10, pp. 17, 749-17, 765CanadaMantle, Structure
DS1998-0605
1998
Helmberger, D.V.Helmberger, D.V., Wen, L., Ding, X.Seismic evidence that the source of the Iceland hotpsot lies at the core-mantle boundary.Nature, Vol. 396, No. 6709, Nov. 26, pp. 251-4.GlobalHot spots
DS1998-1345
1998
Helmberger, D.V.Sidorin, I., Gurnis, M., Helmberger, D.V., Ding, X.Interpreting D seismic structure using synthetic waveforms computed from dynamic models.Earth and Planetary Science Letters, Vol. 163, No. 1-4, Nov. pp. 31-41.MantleGeophysics - seismic, Slab
DS2001-0708
2001
Helmberger, D.V.Luo, S.N., NI, S., Helmberger, D.V.Evidence for a sharp lateral variation of velocity at the core mantle boundary from multipathed PKPab.Earth and Planetary Science Letters, Vol. 189, No. 3-4, July 15, pp. 155-64.MantleBoundary - inner core, outer core
DS2003-1010
2003
Helmberger, D.V.Ni, S., Helmberger, D.V.Seismological constraints on the South African superplume; could be the oldest distinctEarth and Planetary Science Letters, Vol. 206, 1-2, pp. 119-131.South AfricaGeophysics - seismics, Hot spots, plumes
DS2003-1011
2003
Helmberger, D.V.Ni, S., Helmberger, D.V.Ridge like lower mantle structure beneath South AfricaJournal of Geophysical Research, Vol. 108, 2, ESE 12.South AfricaTectonics - craton
DS200412-1431
2003
Helmberger, D.V.Ni, S., Helmberger, D.V.Ridge like lower mantle structure beneath South Africa.Journal of Geophysical Research, Vol. 108, 2, ESE 12.Africa, South AfricaTectonics - craton
DS200612-0564
2005
Helmberger, D.V.Helmberger, D.V., Sidao, Ni.Seismic modeling constraints on the South African super plume.American Geophysical Union, Geophysical Monograph, ed. Van der Hilst, Earth's Deep mantle, structure ...., No. 160, pp. 63-82.Africa, South AfricaGeophysics - seismics
DS201312-0895
2013
Helmberger, D.V.Sun, D., Helmberger, D.V., Jackson, J.M., Clayton, R.W.Rolling hills on the core-mantle boundary.Earth and Planetary Science Letters, Vol. 361, pp. 333-342.MantleCMB - structure
DS1998-0990
1998
Helmburger, D.Melbourne, T., Helmburger, D.Fine structure of the 410 Km discontinuityJournal of Geophysical Research, Vol. 103, No. 5, May 10, pp. 10091-103.MantleTectonics, Boundary - discontinuity
DS1970-0927
1974
Helme, N.Helme, N.Thomas Major CullinanJohannesburg: Mcgraw-hill, 271P., ILLLUS.South AfricaKimberley, Janlib, Biography
DS201212-0611
2012
Helmens, K.Rutter, N., Coronato, A.,Helmens, K., Rabassa, J., Zarate, M.Glaciations in North and South America from the Miocene to the last glacial maximum.Springer, Book adUnited States, Canada, South AmericaGeomorphology
DS200912-0294
2009
Helmer, J.Helmer, J.Russia's diamonds up for grabs. Outline of diamond mines and their potential ownerships.Waldman, March 14, 2p.RussiaEconomics
DS1860-1032
1898
Helmracker, R.Helmracker, R.On the Russian Diamond OccurrencesEngineering and Mining Journal, OCTOBER 28TH.RussiaHistory
DS1859-0085
1846
HelmreichenHelmreichen, Zu Brunfeld, V.Von.Uber das Geognostiche Vorkommen der Diamanten und Ihre Gewinnungsmethoden Auf der Serra Do Grao-mogol in der Provinz Minas-geraes in Brasilien.Wien: Bei Braumuller And Seidel, 74P.BrazilDiamond notable
DS1990-0682
1990
Helms, W.Helms, W.The diamond mining industry in northern Cape Province. (in German)Gluckauf, (in German), Vol. 126, No. 1-2, pp. 47-51South AfricaMining industry, Diamond
DS1986-0332
1986
Helmsaedt, H.Hall, D.C., Helmsaedt, H., Schulze, D.J.The Cross diatreme: a kimberlite in a young orogenic beltProceedings of the Fourth International Kimberlite Conference, Held Perth, Australia, No. 16, pp. 30-32British ColumbiaPetrography
DS1999-0524
1999
HelmstaedtOlsen, H.K., Jensen, S.M., Schonwandt, H.K., HelmstaedtReview of diamond exploration in GreenlandNorth Atlantic Mineral Symposium, Sept., abstracts pp. 166-8.Greenland, Labrador, Ungava, QuebecExploration - brief review, History
DS1960-1108
1969
Helmstaedt, H.Gavasci, A.T., Helmstaedt, H.A Pyroxene Rich Garnet Peridotite Inclusion in an Ultramafic Breccia Dike at Moses Rock, Southeastern Utah.Journal of Geophysical Research, Vol. 74, PP. 6691-6695.United States, Utah, Colorado PlateauBlank
DS1960-1127
1969
Helmstaedt, H.Helmstaedt, H.Petrofabrics of Mafic and Ultramafic Inclusions from Kimberlite Pipes in Southeastern Utah and Northeastern Arizona.Eos, Vol. 50, No. 4, P. 345, (abstract.).United States, Arizona, Utah, Colorado PlateauBlank
DS1970-0528
1972
Helmstaedt, H.Helmstaedt, H., Anderson, O.L., Gavasci, A.T.Petrofabric Studies of Eclogite, Spinel-websterite, and SpinJournal of Geophysical Research, Vol. 77, PP. 4350-4365.United States, Utah, Arizona, Colorado PlateauBlank
DS1970-0713
1973
Helmstaedt, H.Helmstaedt, H., Doig, R.Eclogite Nodules from Kimberlite Pipes of the Colorado Plateau Samples of Subducted Franciscan Type Oceanic Lithosphere. #1International Kimberlite Conference FIRST EXTENDED ABSTRACT VOLUME., PP. 171-172.United States, Colorado Plateau, Colorado, Arizona, Utah, New MexicoDiatreme
DS1970-0928
1974
Helmstaedt, H.Helmstaedt, H.Overplating: a Major Factor in the Tectonics Evolution of The Colorado Plateau.Eos, Vol. 55, No. 4, P. 448, (abstract.).United States, Colorado PlateauBlank
DS1975-0103
1975
Helmstaedt, H.Helmstaedt, H., Doig, R.Eclogite Nodules from Kimberlite Pipes of the Colorado Plateau-samples of Subducted Franciscan Type Oceanic Lithosphere. #2Physics and Chemistry of the Earth, Vol. 9, PP. 95-111.United States, Colorado PlateauBlank
DS1975-0526
1977
Helmstaedt, H.Helmstaedt, H., Schulze, D.J.Type A- Type C Eclogite Transition in a Xenolith from the Moses Rock Diatreme Further Evidence for the Presence of Metamorphosed Ophiolites Beneath the Colorado Plateau.International Kimberlite Conference SECOND EXTENDED ABSTRACT VOLUME., United States, Colorado PlateauBlank
DS1975-0862
1978
Helmstaedt, H.Schulze, D.J., Helmstaedt, H., Cassie, R.M.Pyroxene Ilmenite Intergrowths in Garnet Pyroxenite Xenoliths from a New York Kimberlite and Arizona Latite.American Mineralogist., Vol. 63, PP. 258-265.United States, Appalachia, New York, Arizona, Colorado Plateau, Rocky MountainsPetrography
DS1975-1072
1979
Helmstaedt, H.Helmstaedt, H., Schulze, D.J.Garnet Clinopyroxene-chlorite Eclogite Transition in a Xenolith from Moses Rock: Further Evidence for Metamorphosed Ophiolites Under the Colorado Plateau.International Kimberlite Conference SECOND Proceedings, Vol. 2, PP. 357-365.United States, Colorado PlateauBlank
DS1975-1211
1979
Helmstaedt, H.Schulze, D.J., Helmstaedt, H.Garnet Pyroxenite and Eclogite Xenoliths from the Sullivan Buttes Latite, Chino Valley, Arizona.International Kimberlite Conference SECOND Proceedings, Vol. 2, PP. 318-329.GlobalKimberlite, Colorado Plateau, Rocky Mountains
DS1982-0269
1982
Helmstaedt, H.Helmstaedt, H.Possible Pre-kimberlite Serpentinization in Ultrabasic Xenoliths from Bultfontein and Jagersfontein Mines, South Africa.Proceedings of Third International Kimberlite Conference, TERRA COGNITA, ABSTRACT VOLUME., Vol. 2, No. 3, P. 210, (abstract.).South AfricaKimberlite, Texture, Mineralogy, Alteration
DS1982-0270
1982
Helmstaedt, H.Helmstaedt, H., Gurney, J.J.Kimberlites of Southern Africa- are they Related to Subduction Processes? #1Proceedings of Third International Kimberlite Conference, TERRA, Vol. 2, No. 3, PP. 272-273, (abstract.).South AfricaKimberlite, Genesis
DS1982-0513
1982
Helmstaedt, H.Raeside, R.P., Helmstaedt, H.The Ile Bizard Intrusion, Montreal, Quebec- Kimberlite or Lamprophyre?Canadian Journal of Earth Sciences, Vol. 19, No. 10, PP. 1996-2011.Canada, QuebecKimberlite, Xenolith, Breccia, Diatreme, Alnoite
DS1983-0215
1983
Helmstaedt, H.Erdmer, P., Helmstaedt, H.Eclogite from central Yukon: a record of subduction at the western Margin of ancient North America.Canadian Journal of Earth Sciences, Vol. 20, pp. 1389-1408.YukonEclogite, Subduction
DS1983-0528
1983
Helmstaedt, H.Raeside, R.P., Helmstaedt, H.The Ile Bizard Intrusion, Montreal, Quebec- Kimberlite or Lamprophyre? Discussion.Canadian Journal of Earth Sciences, Vol. 20, No. 9, PP. 1496-1498.Canada, QuebecGenesis, Kimberlite, Alnoite
DS1984-0336
1984
Helmstaedt, H.Hanish, M.B., Helmstaedt, H.Prekimberlitic Serpentinization of Peridotite Xenoliths, Bultfontein and Jagersfonetin Mines, R.s.a.- Implications for Upper Mantle Models.Geological Society of America (GSA), Vol. 16, No. 6, P. 529. (abstract.).South AfricaPetrography
DS1986-0355
1986
Helmstaedt, H.Helmstaedt, H., Schulze, D.J.Kimberlites and the mantle sample- can we decode theirgeotectonicmessage?Proceedings of the Fourth International Kimberlite Conference, Held Perth, Australia, No. 16, pp. 118-120South AfricaEclogites
DS1986-0356
1986
Helmstaedt, H.Helmstaedt, H., Schulze, D.J.Petrologic and geotectonic significance of eclogite xenoliths from Navajodiatremes, Colorado PlateauGeological Society of America, Vol. 18, No. 2, p. 116. AbstractUnited States, Colorado PlateauEclogite
DS1987-0270
1987
Helmstaedt, H.Hall, D.C., Helmstaedt, H., Schulze, D.J.The Cross diatreme, British Columbia, Canada: a kimberlite in a young orogenic belt #2Fourth International Kimberlite Conference, 26p. 7 figsBritish ColumbiaCanada, Diatreme
DS1988-0297
1988
Helmstaedt, H.Helmstaedt, H., Schulze, D.J.Eclogite facies ultramafic xenoliths from Colorado plateau diatremebreccias: comparison with eclogites in crustal environments, evaluation of thesubductionEclogites and eclogite-facies rocks, D.C. Smith ed., Elsevier, Dev. in, Chapter 7, pp. 387-450Colorado PlateauEclogite, *hypothesis impl. for ecl
DS1988-0616
1988
Helmstaedt, H.Schulze, D.J., Helmstaedt, H.Coesite-sanidine eclogites from kimberlite: products of mantle fractionation or subduction?Journal of Geology, Vol. 96, No. 4, pp. 435-443South AfricaEclogite, Coesite
DS1989-0572
1989
Helmstaedt, H.Hall, D.C., Helmstaedt, H., Schulze, D.J.The Cross diatreme, British Columbia, Canada: akimberlite in a young orogenic belt #1Geological Society of Australia Inc. Blackwell Scientific Publishing, No. 14, Vol. 1, pp. 97-108British ColumbiaDiatreme, Cross
DS1989-0619
1989
Helmstaedt, H.Helmstaedt, H., Schulze, D.J.Southern African kimberlites and their mantle sample:implications for Archean tectonics and lithosphereevolutionGeological Society of Australia Inc. Blackwell Scientific Publishing, Special, No. 14, Vol. 1, pp. 358-368Southern AfricaTectonics
DS1989-0779
1989
Helmstaedt, H.King, J.E., Helmstaedt, H.Deformational history of an Archean fold belt, eastern Point Lake area, Slave Structural province, N.W.T.Canadian Journal of Earth Sciences, Vol. 26, No. 1, January pp. 106-118Northwest TerritoriesStructure, Archean
DS1990-1320
1990
Helmstaedt, H.Schulze, D.J., Helmstaedt, H.Garnet pyroxenites and eclogites from Chino Valley,Arizona, Lower crust or Upper mantle?Geological Society of America (GSA) Abstracts with programs, Cordilleran, Vol. 22, No. 3, p. 81Colorado Plateau, ArizonaEclogites, Mantle genesis
DS1991-0876
1991
Helmstaedt, H.Kirkley, M.B., Gurney, J.J., Harte, J.J., Helmstaedt, H.Geochemical correlations in Roberts Victor eclogitesProceedings of Fifth International Kimberlite Conference held Araxa June 1991, Servico Geologico do Brasil (CPRM) Special, p. 224South AfricaGeochemistry, Eclogite xenoliths
DS1991-1197
1991
Helmstaedt, H.Moser, D.E., Krogh, T.E., Heaman, L.M., Hanes, J.A., Helmstaedt, H.The age and significance of Archean mid-crustal extension in the Kapuskasing uplift, Superior Province, CanadaGeological Society of America Annual Meeting Abstract Volume, Vol. 23, No. 5, San Diego, p. A 134OntarioTectonics, Kapuskasing uplift
DS1993-0598
1993
Helmstaedt, H.Gurney, J.J., Helmstaedt, H., Moore, R.O.A review of the use and application of mantle mineral geochemistry in diamond exploration.Pure and Applied Chemistry, Vol. 65, No. 12, December pp. 2423-2442.GlobalGeochemistry, Diamond exploration
DS1993-0701
1993
Helmstaedt, H.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
DS1994-0755
1994
Helmstaedt, H.Helmstaedt, H.The tectonic setting of diamond formation in diamond bearing kimberlitesThe Canadian Institute of Mining, Metallurgy and Petroleum (CIM) Section Meeting Oct. 12, Vancouver, List of speakersGlobalTectonics
DS1994-0756
1994
Helmstaedt, H.Helmstaedt, H.Cadre geotectonique des depots -primaires de diamants....(in French)Seventh Colloque Annuel en Ressources Minerales, Universite du Quebec a, p. 2. abstract in FrenchGlobalTectonics
DS1994-1444
1994
Helmstaedt, H.Reif, C., Villeneuve, M., Helmstaedt, H.Discovery of an Archean carbonatite bearing alkaline complex in northern Slave Province: tectonic economicsNorthwest Territories 1994 Open House Abstracts, p. 53-54. abstractNorthwest TerritoriesCarbonatite
DS1995-0785
1995
Helmstaedt, H.Helmstaedt, H., Gurney, J.J.Geotectonic controls of primary diamond deposits: implications for areaselection.Journal of Geochemical Exploration, Vol. 52, pp. 125-144.Northwest TerritoriesDiamond exploration, Area selection
DS1998-1576
1998
Helmstaedt, H.White, D., Helmstaedt, H., Harrap, R., Thurston, P.The origin of our continent: LITHOPROBE seismic investigations in The western Superior TransectThe Canadian Mining and Metallurgical Bulletin (CIM Bulletin), Vol. 90, No. 1017, Feb. pp. 78-82OntarioLithoprobe, Plate tectonics
DS2001-0467
2001
Helmstaedt, H.Helmstaedt, H., Gurney, J.J.Formation of the Archean Kaapvaal Province revisited: implications for birth and growth Diamondiferous rootSlave-Kaapvaal Workshop, Sept. Ottawa, 4p. abstractSouth AfricaCraton - Kaapvaal, Genesis
DS2002-0703
2002
Helmstaedt, H.Helmstaedt, H., Gurney, J.J.Hidden diamond deposits - role of tectonic and structural Craton analysis in integrated expl.approach.Society of Economic Geologists, Abstracts, pp. 27-28.Northwest TerritoriesTectonics - Slave Craton, Geodynamics
DS2002-1488
2002
Helmstaedt, H.Simmons, A., Helmstaedt, H.Petrography and geochemistry of the Nicholas Bay kimberlite, Lac de Gras kimberlite project, NWT.30th. Yellowknife Geoscience Forum, Abstracts Of Talks And Posters, Nov. 20-22, p. 61. abstractNorthwest TerritoriesGeochemistry
DS2003-0576
2003
Helmstaedt, H.Helmstaedt, H.Craton analysis in diamond exploration: why the Slave Province was a good place toGeological Association of Canada Annual Meeting, Abstract onlyNorthwest TerritoriesTectonics, tomography
DS2003-0882
2003
Helmstaedt, H.Maruyama, S., Helmstaedt, H.Fate of the subducted Farallon plate referred from eclogite xenoliths in the ColoradoGeology, Vol. 31, 7, July pp. 589-92.Colorado PlateauCoesite, zircon, geochronology
DS2003-1021
2003
Helmstaedt, H.Nowicki, T.E., Crawford, B., Dyck, D., Carlson, J., McElroy, R., Helmstaedt, H.A review of the geology of kimberlite pipes of the Ekati property, Northwest8 Ikc Www.venuewest.com/8ikc/program.htm, Session 1, AbstractNorthwest TerritoriesGeology, Deposit - Ekati
DS2003-1108
2003
Helmstaedt, H.Pretorius, W., Chipley, D., Keyser, K., Helmstaedt, H.Direct determination of Os Ir Ru Pt and Re in kimberlites and other geologicalJournal of Analytical Atomic Spectrometry, Vol. 18, 4, pp. 302-9.GlobalGeochemistry
DS2003-1109
2003
Helmstaedt, H.Pretorius, W., Chipley, D., Kyser, K., Helmstaedt, H.Direct determination of trace levels of Os Ir Ru Pt and Re in kimberlite and otherJournal of Analytical Atomic Spectrometry, Vol. 18, 4, pp. 302-9.GlobalSpectrometry - trace elements
DS2003-1401
2003
Helmstaedt, H.Usui, T., Nakamura, E., Kobayashi, K., Maruyama, S., Helmstaedt, H.Fate of the subducted Farallon plate inferred from eclogite xenoliths in the ColoradoGeology, Vol. 31, 7, July, pp. 589-592.Colorado Plateau, New Mexico, WyomingSubduction
DS200412-0817
2003
Helmstaedt, H.Helmstaedt, H.Craton analysis in diamond exploration: why the Slave Province was a good place to go.Geological Association of Canada Annual Meeting, Abstract onlyCanada, Northwest TerritoriesTectonics, tomography
DS200412-1237
2003
Helmstaedt, H.Maruyama, S., Helmstaedt, H.Fate of the subducted Farallon plate referred from eclogite xenoliths in the Colorado Plateau.Geology, Vol. 31, 7, July pp. 589-92.United States, ColoradoCoesite, zircon, geochronology
DS200412-1450
2003
Helmstaedt, H.Nowicki, T.E., Crawford, B., Dyck, D., Carlson, J., McElroy, R., Helmstaedt, H., Oshust, P.A review of the geology of kimberlite pipes of the Ekati property, Northwest Territories, Canada8 IKC Program, Session 1, AbstractCanada, Northwest TerritoriesGeology Deposit - Ekati
DS200412-1587
2003
Helmstaedt, H.Pretorius, W., Chipley, D., Kyser, K., Helmstaedt, H.Direct determination of trace levels of Os Ir Ru Pt and Re in kimberlite and other geological materials using HR ICP Ms.Journal of Analytical Atomic Spectrometry, Vol. 18, 4, pp. 302-9.TechnologySpectrometry - trace elements
DS200412-2028
2003
Helmstaedt, H.Usui, T., Nakamura, E., Kobayashi, K., Maruyama, S., Helmstaedt, H.Fate of the subducted Farallon plate inferred from eclogite xenoliths in the Colorado Plateau.Geology, Vol. 31, 7, July, pp. 589-592.United States, ColoradoSubduction
DS200612-0565
2006
Helmstaedt, H.Helmstaedt, H.Cratons and structures, Canada's potential.Prospectors and Developers Association of Canada, March 1p. abstractCanadaTectonics
DS200612-1455
2006
Helmstaedt, H.Usui, T., Kobayashi, K., Nakamura, E., Helmstaedt, H.Trace element fractionation in deep subduction zones inferred from a lawsonite eclogite xenolith from the Colorado Plateau.Chemical Geology, in press available,United States, Colorado PlateauEclogite, subduction, Farallon plate, coesite
DS200612-1456
2006
Helmstaedt, H.Usui, T., Nakamura, E., Helmstaedt, H.Petrology and geochemistry of eclogite xenoliths from the Colorado Plateau: implications for the evolution of subducted oceanic crust.Journal of Petrology, Vol. 47, 5, pp. 929-964.United States, Colorado PlateauSubduction
DS200712-1103
2007
Helmstaedt, H.Usui, T., Kobayahsi, K., Nakamura, E., Helmstaedt, H.Trace element fractionation in deep subduction zones inferred from a lawsonite eclogite xenolith from the Colorado Plateau.Chemical Geology, Vol. 239, 3-4, April 30, pp. 336-351.United States, Colorado PlateauSubduction
DS200912-0013
2009
Helmstaedt, H.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
DS200912-0295
2009
Helmstaedt, H.Helmstaedt, H.Crust mantle revisited: the Archean Slave Craton, N.W.T., Canada.Lithos, In press available, 33p.Canada, Northwest TerritoriesSlave Craton, structure
DS201412-0352
2012
Helmstaedt, H.Helmstaedt, H., Pehrsson, S.J.Geology and tectonic evolution of the Slave Province, Canada: a post lithoprobe perspective.Tectonics, Geological Survey of Canada, Special Paper, 49, pp. 381-468.Canada, Northwest TerritoriesTectonics - lithoprobe
DS201412-0784
2014
Helmstaedt, H.Schulze, D.J., Flemming, R.L., Shepherd, P.M., Helmstaedt, H.Mantle derived guyanaite in a Cr-omphacite xenolith from Moses Rock diatreme, Utah.American Mineralogist, Vol. 99, pp. 1277-1283.United States, UtahMoses Rock diatreme
DS201508-0376
2015
Helmstaedt, H.Schulze, D.J., Davis, D.W., Helmstaedt, H., Joy, B.Timing of the Cenozoic " Great Hydration" event beneath the Colorado Plateau: Th-Pb dating of monazite in Navajo volcanic field metamorphic eclogite xenoliths.Geology, Vol. 43, pp. 727-730.United States, Colorado PlateauDiatremes - Moses Rock, Mule's Ear, Garnet Ridge, Cane Valley, Red Mesa, Buell Park, Green Knobs
DS201607-1352
2016
Helmstaedt, H.Helmstaedt, H.Diamond tectonics and geotectonics - how do they intersect in the Archean.IGC 35th., Session A Dynamic Earth 1p. AbstractGlobalTectonics
DS201708-1668
2017
Helmstaedt, H.Helmstaedt, H.The life cycle of Diamondiferous cratons - a leitmotif with infinite variations.11th. International Kimberlite Conference, OralMantlediamond genesis
DS201812-2799
2018
Helmstaedt, H.Davy, A.T., Smith, C.B., Helmstaedt, H., Jaques, A.L.PrefaceSociety of Economic Geology Geoscience and Exploration of the Argyle, Bunder, Diavik, and Murowa Diamond Deposits, Special Publication no. 20, p. ixAustralia, India, Canada, Northwest Territories, Africa, Zimbabwedeposits - Argyle, Bunder, Diavik, Murowa
DS201812-2816
2018
Helmstaedt, H.Helmstaedt, H.Tectonic and structural controls on diamondiferous kimberlite and lamproite and their bearing on area selection for diamond exploration.Society of Economic Geology Geoscience and Exploration of the Argyle, Bunder, Diavik, and Murowa Diamond Deposits, Special Publication no. 20, pp. 1-48.Globaltechnology - diamond exploration
DS1988-0298
1988
Helmstaedt, H.H.Helmstaedt, H.H., Mott, J.A., Hall, D.C., Schulze, D.J., DixonStratigraphic and structural setting of intrusive breccia diatremes In the White River-Bulletin River area, southeastern British ColumbiaBritish Columbia Department of Mines, Geological Fieldwork 1987, Paper 1988-1, pp. 363-368British ColumbiaBlank
DS1989-0620
1989
Helmstaedt, H.H.Helmstaedt, H.H., Schulze, D.J.Evidence for subduction and spreading in the Archean rock record:implications for Archean tectonic style and the evolution of the subcontinental lithosphereLpi Technical Report, No. 89-05, pp. 42-44South AfricaTectonics, Age
DS1990-0683
1990
Helmstaedt, H.H.Helmstaedt, H.H., Schulze, D.J.Low temperature eclogites under the Colorado Plateau:fragments of Proterozoic or Mesozoic oceanic crust?Geological Society of America (GSA) Abstracts with programs, Cordilleran, Vol. 22, No. 3, p. 29Colorado PlateauEclogites, Mineralogy
DS1991-0702
1991
Helmstaedt, H.H.Helmstaedt, H.H.Early to mid-Tertiary inverted metamorphic gradient under the ColoradoPlateau: evidence from eclogite xenoliths in ultramafic microbreccias, Navajo volcanic fieldJournal of Geophysical Research, Vol. Paper # 91JB00284Colorado PlateauXenoliths, Subduction, eclogites
DS1991-0703
1991
Helmstaedt, H.H.Helmstaedt, H.H.Geotectonic considerations in diamond explorationnorthwest Territories Geology Division, Exploration overview 1991, November 1991, p. 24, 25. abstract onlyNorthwest TerritoriesTectonics, Diamonds
DS1991-0704
1991
Helmstaedt, H.H.Helmstaedt, H.H.Geotectonic controls of diamonds and kimberlites and their application To diamond explorationProceedings of Fifth International Kimberlite Conference held Araxa June 1991, Servico Geologico do Brasil (CPRM) Special, pp. 173-176United States, Colorado Plateau, South Africa, AustraliaCraton, mantle, Tectonics
DS1992-0696
1992
Helmstaedt, H.H.Helmstaedt, H.H.Primary diamond deposits: what controls their size, grade and locationGiant Ore Deposits, symposium held May 1992 at Queen's University, pp. 15-120GlobalDiamond deposits, Overview
DS1992-1702
1992
Helmstaedt, H.H.Wynne, P.J., Irving, E., Schulz, D.J., Hall, D.C., Helmstaedt, H.H.Paleomagnetism and age of three Canadian Rocky Mountain diatremesCanadian Journal of Earth Sciences, Vol. 29, No. 1, January pp. 35-47British ColumbiaDiatremes -Cross, Blackfoot, HP pipe, Paleomagnetics
DS1993-0649
1993
Helmstaedt, H.H.Helmstaedt, H.H.Natural diamond occurrences and tectonic setting of "primary" diamonddepositsProspectors and Developers Diamond Workshop, held March 27th, Toronto, 70pCanada, GlobalDiamond occurrences, Tectonic setting
DS1993-0650
1993
Helmstaedt, H.H.Helmstaedt, H.H.Natural diamond occurences and tectonic setting of primary diamonddepositsThe Canadian Institute of Mining, Metallurgy and Petroleum (CIM) Professional Development Program, Techniques in exploration for, pp. 3-72GlobalDiamond exploration, Techniques
DS1993-0651
1993
Helmstaedt, H.H.Helmstaedt, H.H.Preservation and destruction of ancient Diamondiferous mantle roots:consequences for area selection in exploration for primary diamond depositsThe Canadian Mining and Metallurgical Bulletin (CIM Bulletin) , Annual Meeting Abstracts approximately 10 lines, Vol. 86, No. 968, March ABSTRACT p. 71Northwest Territories, GlobalTectonics, Mantle source rocks
DS1993-0652
1993
Helmstaedt, H.H.Helmstaedt, H.H.Geotectonic controls of primary diamond deposits: implications for diamond exploration models and Archean tectonicsMid-continent diamonds Geological Association of Canada (GAC)-Mineralogical Association of Canada (MAC) Symposium ABSTRACT volume, held Edmonton May, pp. 7-10Northwest Territories, Wyoming, OntarioTectonics, Structure
DS1993-0653
1993
Helmstaedt, H.H.Helmstaedt, H.H., Gurney, J.J.Geotectonic controls on the formation of diamonds and their kimberlitic and lamproitic host rocks: applications to diamond exploration.Proceedings of the Fifth Kimberlite Conference held in Araxam Brasil, Vol. 2, pp. 236-250. 15p.Africa, North AmericaTectonics, diamond genesis, Craton
DS1994-0757
1994
Helmstaedt, H.H.Helmstaedt, H.H.Geotectonic controls of primary diamond deposits. Implication for area selection in diamond exploration.The Professional Association of Geologists and Geophysicists of QuTbec (APGGQ) 1994, held Val'D'Or Aprl 13-15., 1p. abstractGlobalGeotectonics, Tectonics
DS1995-0059
1995
Helmstaedt, H.H.Armstrong, K.A., Roeder, P.L., Helmstaedt, H.H.The spinel mineralogy of the C14 kimberlite, Kirkland Lake, OntarioProceedings of the Sixth International Kimberlite Conference Extended Abstracts, p. 14-16.OntarioMineralogy -spinel, Deposit - C14 Kirkland Lake
DS1995-0786
1995
Helmstaedt, H.H.Helmstaedt, H.H., Gurney, J.J.Kimberlites -why when and where? a heirarchy of geotectonic controlsProceedings of the Sixth International Kimberlite Conference Abstracts, pp. 233-235.South Africa, Northwest TerritoriesGeotectonics, Craton
DS1997-0040
1997
Helmstaedt, H.H.Armstrong, K.A., Roeder, P.L., Helmstaedt, H.H.Composition of spinels in the Carbon 14 kimberlite, Kirkland Lake Ontario.Russian Geology and Geophysics, Vol. 38, No. 2, pp. 454-466.OntarioGeochemistry, Deposit -C 14
DS1997-0500
1997
Helmstaedt, H.H.Helmstaedt, H.H., Gurney, J.J.Geodynamic controls of kimberlites - what are the roles of hotspot and plate tectonics?Russian Geology and Geophysics, Vol. 38, No. 2, pp. 492-508.MantleHotspots, Plate tectonics
DS1998-0067
1998
Helmstaedt, H.H.Bailey, L.M., Helmstaedt, H.H., Peterson, R., MandarinoMicrodiamonds and indicator minerals from a talc schist rock, FrenchGuiana.7th International Kimberlite Conference Abstract, pp. 37-39.GlobalMetakimberlites, Paramaca series
DS1998-0585
1998
helmstaedt, H.H.Harrap. R.M., helmstaedt, H.H.Reasoning across deep time: formal reasoning examination of Archeantectonics.Geological Society of America (GSA) Annual Meeting, abstract. only, p.A396.GlobalTectonics, Crustal assembly
DS1998-0606
1998
Helmstaedt, H.H.Helmstaedt, H.H.The Archean Slave province: regional tectonic framework for Canada's first economic primary diamond deposits.Geological Society of America (GSA) Annual Meeting, abstract. only, p.A245.Northwest TerritoriesTectonics - overview, Slave Province setting
DS1998-0607
1998
Helmstaedt, H.H.Helmstaedt, H.H., Harrap, R.M.Tectonic aspects of the kimberlite diamond upper mantle sample connection:does a coherent model evolve?7th International Kimberlite Conference Abstract, pp. 331-5.Ontario, Manitoba, Northwest TerritoriesCraton, subduction, Petrology, Lithoprobe, geophysics - seismics, SNORCLE.
DS1998-1267
1998
Helmstaedt, H.H.Ruiz, J., McCandless, T.E., Helmstaedt, H.H.Eclogites from the Colorado Plateau: a Phanerozoic record of subduction beneath North America.7th. Kimberlite Conference abstract, pp. 757-9.Colorado PlateauSubduction, Eclogites
DS1999-0303
1999
Helmstaedt, H.H.Helmstaedt, H.H., Olesen, H.K., Jensen, S., SchonwandtThe diamond potential of the northern margin of the North Atlantic Cratonin West Greenland.North Atlantic Mineral Symposium, Sept., abstracts pp. 169-70.Greenland, Labrador, Ungava, QuebecExploration - brief review, Craton
DS1999-0615
1999
Helmstaedt, H.H.Ruiz, J., McCandless, T.E., Helmstaedt, H.H.Re Os model ages for eclogite xenoliths from the Colorado Plateau, USA7th International Kimberlite Conference Nixon, Vol. 2, pp. 736-40.Colorado Plateau, New MexicoGeochronology, subduction, diatreme, Moses Rock, Garnet Ridge, Mule Ear
DS2003-0299
2003
Helmstaedt, H.H.Crawford, J., Helmstaedt, H.H.Comparative study of hypabyssal kimberlite from four locations within the Slave8 Ikc Www.venuewest.com/8ikc/program.htm, Session 7, POSTER abstractNorthwest TerritoriesDeposit - Finlay, Muskox, Rich, Jean
DS2003-1105
2003
Helmstaedt, H.H.Pretorius, W., Helmstaedt, H.H., Kyser, K.Platinum group element geochemistry of kimberlitic rocks - a window into the nature of8 Ikc Www.venuewest.com/8ikc/program.htm, Session 7, POSTER abstractUnited States, Canada, Greenland, Somerset Island, ChinaBlank
DS2003-1473
2003
Helmstaedt, H.H.White, D.J., Musacchio, G., Helmstaedt, H.H., Harrap, R.M., Thurston, P.C.Images of lower crustal oceanic slab: direct evidence for tectonic accretion in theGeology, Vol. 31, 11, pp. 997-1000.OntarioSubduction - not specific to diamonds
DS200412-0386
2003
Helmstaedt, H.H.Crawford, J., Helmstaedt, H.H.Comparative study of hypabyssal kimberlite from four locations within the Slave Craton.8 IKC Program, Session 7, POSTER abstractCanada, Northwest TerritoriesKimberlite petrogenesis, Finlay, Muskox, Rich, Jean
DS200412-1584
2003
Helmstaedt, H.H.Pretorius, W.,Helmstaedt, H.H., Kyser, K.Platinum group element geochemistry of kimberlitic rocks - a window into the nature of the Diamondiferous mantle.8 IKC Program, Session 7, POSTER abstractUnited States, Canada, Nunavut, Somerset IslandKimberlite petrogenesis
DS200412-2109
2003
Helmstaedt, H.H.White, D.J., Musacchio, G., Helmstaedt, H.H., Harrap, R.M., Thurston, P.C., Van der Velden, A., Hall, K.Images of lower crustal oceanic slab: direct evidence for tectonic accretion in the Archean western Superior Province.Geology, Vol. 31, 11, pp. 997-1000.Canada, OntarioSubduction - not specific to diamonds
DS201012-0254
2010
Helmstaedt, H.H.Gurney, J.J., Helmstaedt, H.H., Richardson, S.H., Shirey, S.B.Diamonds through time.Economic Geology, Vol. 105, 3, pp. 689-712.GlobalHistory of diamond genesis
DS201012-0729
2010
Helmstaedt, H.H.Smith, E.M., Helmstaedt, H.H., Flemming, R.I.Survival of the brown colour in diamond during storage in the subcontinental lithospheric mantle.The Canadian Mineralogist, Vol. 48, 3, pp. 571-582.Canada, Northwest TerritoriesDiamond morphology - Ekati
DS201012-0730
2010
Helmstaedt, H.H.Smith, E.M., Helmstaedt, H.H., Flemming, R.I.Survival of the brown colour in diamond during storage in the subcontinental lithospheric mantle.The Canadian Mineralogist, Vol. 48, 3, pp. 571-582.Canada, Northwest TerritoriesDiamond morphology - Ekati
DS201112-0429
2010
Helmstaedt, H.H.Helmstaedt, H.H., Gurney, J.J., Richardson, S.H.Ages of cratonic diamond and lithosphere evolution: constraints on Precambrian tectonics and diamond exploration.The Canadian Mineralogist, Vol. 48, 6, pp. 1385-1408.Canada, GlobalGeochronology, craton roots, UHP
DS201212-0274
2012
Helmstaedt, H.H.Gurney, J.J., Helmstaedt, H.H.Type Iia diamonds and their enhanced ecnomic significance.10th. International Kimberlite Conference Feb. 6-11, Bangalore India, AbstractGlobalDiamond - Iia
DS201212-0292
2012
Helmstaedt, H.H.Helmstaedt, H.H.Tectonic relationships between cratonic and ultra high pressure (UHP) diamond implications for craton formation and stabilization.10th. International Kimberlite Conference Feb. 6-11, Bangalore India, AbstractGlobalUHP
DS201312-0377
2013
Helmstaedt, H.H.Helmstaedt, H.H.Tectonic relationships between E-type cratonic and ultra-high-pressure (UHP) diamonds: implications for craton formation and stabilization.Proceedings of the 10th. International Kimberlite Conference, Vol. 1, Special Issue of the Journal of the Geological Society of India,, Vol. 1, pp. 45-58.MantleUHP
DS1993-0599
1993
Helmstaedt, J.Gurney, J.J., Helmstaedt, J., Moore, R.O.A review of the use and application of mantle geochemistry in diamondexploration.Pure and Applied Geochemistry, Vol. 65, No. 12, pp. 2423-2442.MantleRoots, Geochemistry
DS1987-0655
1987
Helmsteadt, H.Schultz, D.J., Helmsteadt, H., Carmichael, D.M.Hydrated pyroxenite xenoliths from Navajo diatremes, ColoradoPlateau:pressure temperature estimates and metasomatic reactions in the mantle wedge above tGeological Society of America, Vol. 19, No. 7 annual meeting abstracts, p.835. abstracColorado PlateauDiatreme
DS1992-0697
1992
Helmsteadt, H.Helmsteadt, H.Cratons and diamondsNorthwest Territories Geoscience Forum held November 25, 26th. 1992, AbstractNorthwest TerritoriesTectonics, Diamonds
DS1995-1136
1995
Helmsteadt, H.MacLachlan, K., Helmsteadt, H.Geology and geochemistry of an Archean mafic dike complex in the Chan Formation -revised plate tectonicsCanadian Journal of Earth Sciences, Vol. 32, No. 5, May pp. 614-630Northwest TerritoriesYellowknife greenstone belt, Tectonics
DS200712-0425
2007
Helmsteadt, H.H.Helmsteadt, H.H.Geotectonic setting of Slave Province diamond deposits.Geological Association of Canada, Gac-Mac Yellowknife 2007, May 23-25, Volume 32, 1 pg. abstract p.39.Canada, Northwest TerritoriesType 3 province
DS200912-0296
2009
Helmsteadt, H.H.Helmsteadt, H.H., Gurney, J.J., Richardson, S.H.Diamond ages and lithosphere evolution: applications to diamond exploration.GAC/MAC/AGU Meeting held May 23-27 Toronto, Abstract onlyTechnologyDiamond genesis and craton evolution
DS201112-0053
2011
HelmyBallhaus, C., Laurenz, V., Fonseca, R., Munker, C., Albarede, Rohrbach, Schmidt, Jochum, Stoll, Weis, HelmyLate volatile addition to Earth.Goldschmidt Conference 2011, abstract p.475.MantleW and Cr elements
DS202005-0717
2020
Helmy, H.H.Abdel Halim, A.H., Helmy, H.H., Elhaddad, M.A., El-Mahallawi, M., Mogessie, A.Petrology of a Neoproteroxoic mantle peridotite-chromitite association from Abu Dahr area, eastern Egypt Desert, Egypt: infiltration of boninitic melt in highly depleted harzburgite.Journal of African Earth Sciences, Vol. 165, 18p. PdfAfrica, EgyptBoninite

Abstract: Peridotites of Abu Dahr represent the main litho-unit of a Neoproterozoic dismembered ophiolite sequence and are among the best-preserved and well-exposed mantle rocks in South Eastern Desert of Egypt. Here, we present new geochemical and mineral chemical data for peridotites and associated pyroxenites and for chromitites and their platinum-group minerals to constrain their petrogenesis and geotectonic setting. The Abu Dahr ophiolite mantle section consists mainly of harzburgites, cut by pyroxenite dykes and containing dunite-chromitite lenses. The harzburgites are composed of olivine, orthopyroxene, spinel and minor clinopyroxene (?1.0 vol %) and amphibole. Olivine from harzburgites is highly magnesian (Fo 91-93) and Cr-spinel shows a wide-range of Cr2O3 and Al2O3 contents. The enstatite component of orthopyroxene decreases from harzburgite (En = 90-91) to orthopyroxenite (En = 84-87). Amphiboles are represented by magnesiohornblende and tschermakite. The chromitites are massive to disseminated and composed of magnesiochromite with high Cr# (83-93) and Mg# (66-79), and low TiO2 (<0.1 wt%) content. Solid inclusions in chromite include olivine, orthopyroxene and hornblende. Laurite (RuS2) is the most common PGM detected in the investigated chromitite samples and forms micrometer-size inclusions in fresh chromite. Various Ni-sulfides are found both in fresh chromite and along serpentine veinlets. Harzburgites have a refractory composition with a very low Al2O3 (0.4-0.8 wt%) and CaO (0.2-1.6 wt%) contents and high bulk-rock Mg# (89-92). Geochemical data suggest that the Abu Dahr peridotites are highly depleted SSZ peridotites formed in a forearc mantle wedge setting by high degrees of hydrous partial melting and emplaced as a result of the collision of the intra-oceanic arc with the Beitan gneisses. The podiform chromitites and orthopyroxenites were formed due to impregnation of mantle wedge harzburgites by boninitic melt. The highly depleted nature of the harzburgite is responsible for the small reserves of chromite ore at Abu Dahr and in the South Eastern Desert in general.
DS201312-0053
2013
Helmy, H.M.Ballhaus, C., Laurenz, V., Munker, C., Fonseca, R.O.C., Albarede, F., Rohrbach, A., Lagos, M., Schmidt, M.W., Jochum, K-P., Stoll, B., Weis, U., Helmy, H.M.The U /Pb ratio of the Earth's mantle - a signature of late volatile addition.Earth and Planetary Interiors, Vol. 362, pp. 237-245.MantleMelting
DS1930-0163
1934
Helsberger, H.Helsberger, H.Kann der Diamant Kosmogenetischer Ursprung Sein?Zeits. Prakt. Geol., Vol. 42, PP. 124-125.Southwest Africa, NamibiaDiamond, Genesis, Meteoritic, Brukkaros
DS1984-0352
1984
Helstaedt, H.Helstaedt, H., Gurney, J.J.Kimberlites of Southern Africa- are they Related to Subduction Processes? #2Proceedings of Third International Kimberlite Conference., Vol. 1, PP. 425-434.South Africa, Botswana, LesothoDistribution, Kimberlite, Genesis, Xenolith
DS200812-0046
2008
Helstaedt, H.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
DS1994-0758
1994
Helterbrand, J.D.Helterbrand, J.D., Cressie, N.Universal cokriging under intrinsic coregionalizationMathematical Geology, Vol. 26, No. 2, pp. 205-236GlobalGeostatistics, Cokriging
DS200512-0420
2005
Hemant, K.Hemant, K., Maus, S.Why no anomaly is visible over most of the continent ocean boundary in the global crustal magnetic field.Physics of the Earth and Planetary Interiors, Vol. 149, 3-4, April 15, pp. 321-333.MantleGeophysics - magnetics
DS200612-1090
2006
Hemant, K.Pilkington, M., Snyder, D.B., Hemant, K.Weakly magnetic crust in the Canadian Cordillera.Earth and Planetary Science Letters, Vol. 248, 1-2, Aug. 15, pp. 461-470.Canada, British ColumbiaGeophysics - magnetics
DS200712-0426
2007
Hemant, K.Hemant, K., Thebault, E., Mandea, M., Ravat, D., Maus, S.Magnetic anomaly map of the world: merging satellite, airborne, marine and ground based magnetic dat a sets.Earth and Planetary Science Letters, Vol. 260, 1-2, pp. 56-71.GlobalMap - magnetics
DS200712-0427
2007
Hemant, K.Hemant, K., Thebault, E., Mandea, M., Ravat, D., Maus, S.Magnetic anomaly map of the world: merging satellite, airborne, marine and ground based magnetic dat a sets.Earth and Planetary Science Letters, Vol. 260, 1-2, pp. 56-71.GlobalMap - magnetics
DS201312-0539
2013
Hemawan, K.Liang, Q., Meng, Y., Yan, C., Krasnicki, S., Lai, J., Hemawan, K., Shu,H., Popov, D., Yu,T., Yang, W., Mao, H., Hemley, R.Developments in synthesis, characterization, and application of large high-quality CVD single crystal diamond.Journal of Superhard Materials, Vol. 35, 4, pp. 195-213.TechnologyDiamond synthetics
DS1990-1226
1990
Hemingway, B.S.Richet, P., Robie, R.A., Hemingway, B.S., Beuville, D., Richard, G.Thermodynamic and melting properties of pyrope (Mg3Al2Si3O12)Terra, Abstracts of Experimental mineralogy, petrology and, Vol. 2, December abstracts p. 93AlpsMantle, Pyrope
DS1991-1708
1991
Hemingway, B.S.Tequil, C., Robie, R.A., Hemingway, B.S., Neuville, D.R., Richet, P.Melting and thermodynamic properties of pyrope (MgsAl2Si3O12)Geochim. et Cosmochimica Acta, Vol. 55, pp. 1005-1010GlobalMineralogy -experimental, Pyrope
DS2001-0036
2001
Hemley, R.Angel, R.J., Frost, D.J., Ross, N.L., Hemley, R.Stabilities and equations of state of dense hydrous magesium silicatesPhysics of the Earth and Planetary Interiors, Vol. 127, No. 1-4, Dec. 1, pp. 181-96.MantleMineralogy - silicates, Subduction - geodynamics, rheology
DS2003-0026
2003
Hemley, R.Araujo, D.P., Gaspar, J.C., Fei, Y., Hauri, E.H., Hemley, R., Bulanova, G.P.Mineralogy of diamonds from the Juin a Province, Brazil8ikc, Www.venuewest.com/8ikc/program.htm, Session 3, POSTER abstractBrazilDiamonds
DS201312-0539
2013
Hemley, R.Liang, Q., Meng, Y., Yan, C., Krasnicki, S., Lai, J., Hemawan, K., Shu,H., Popov, D., Yu,T., Yang, W., Mao, H., Hemley, R.Developments in synthesis, characterization, and application of large high-quality CVD single crystal diamond.Journal of Superhard Materials, Vol. 35, 4, pp. 195-213.TechnologyDiamond synthetics
DS1989-0425
1989
Hemley, R.J.Finger, L.W., Ko, J., Hazen, R.M., Gasparik, T., Hemley, R.J.Crystal chemistry of phase B and an anhydrous analogue:implications for water storage in the upper mantleNature, Vol. 341, No. 6238, Sept. 14, pp. 40-142GlobalMantle, Geochemistry
DS1990-1199
1990
Hemley, R.J.Prewitt, C.T., Carlson, R., Hemley, R.J.Chemical evolution of the mantleAmerican Geophysical Union (AGU)/MSA Meeting to be held May 29-June 1, Session MO2-GlobalMantle, Tectonics
DS1991-0705
1991
Hemley, R.J.Hemley, R.J., Kubicki, J.D.Mineral physics: deep mantle meltingNature, Vol. 349. No. 6307, January 24, p. 283GlobalMantle, Physics
DS1991-1047
1991
Hemley, R.J.Mao, H.K., Hemley, R.J.Optical transitions in diamond at ultrahigh pressuresNature, Vol. 351, No. 6329, June 27, pp. 721-724GlobalDiamond morphology, Spectroscopy
DS1992-1478
1992
Hemley, R.J.Stixrude, L., Hemley, R.J., Fei, Y., Mao, H.K.Thermoeleasticity of silicate perovskite and magnesiowustite and stratification of the earth's mantleScience, Vol. 257, August 21, pp. 1099-1101MantleStratification, Perovskite
DS1995-0787
1995
Hemley, R.J.Hemley, R.J.Chemistry of the deep mantle and coreGeological Society of America (GSA) Abstracts, Vol. 27, No. 6, abstract p. A 94.MantleGeochemistry
DS1995-0957
1995
Hemley, R.J.Kingma, K.J., Cohen, R.E., Hemley, R.J., Mao, H.K.Transformation of stishovite to a denser phase at lower mantle pressuresNature, Vol. 374, No. 6519, March 16, p. 243-245.MantleCoesite association
DS1996-0938
1996
Hemley, R.J.McMillan, P.F., Hemley, R.J., Gillet, P.Vibrational spectroscopy of mantle mineralsIn: Mineral spectroscopy edited by Dyar, pp. 175-214.MantleMineral spectroscopy
DS1998-0511
1998
Hemley, R.J.Gillet, P., Hemley, R.J., McMillan, P.F.Vibrational properties at high pressures and temperaturesReviews in Mineralogy, Vol. 37, pp. 525-90.MantleMineralogy, Petrology - experimental
DS1998-0608
1998
Hemley, R.J.Hemley, R.J., Mao, H.K., Cohen, R.E.high pressure electronic and magnetic propertiesReviews in Mineralogy, Vol. 37, pp. 591-638.MantleMineralogy, Petrology - experimental
DS1998-0609
1998
Hemley, R.J.Hemley, R.J., Mao., H.K.X rays on deep mantle and core dynamicsIma 17th. Abstract Vol., p. A 36, abstractMantleGeodynamics
DS1998-0936
1998
Hemley, R.J.Mao, H-K., Hemley, R.J.New windows on the Earth's deep interiorReviews in Mineralogy, Vol. 37, pp. 1-32.GlobalLithosphere, Geophysics - gravity
DS1998-1415
1998
Hemley, R.J.Stixrude, L., Cohen, R.E., Hemley, R.J.Theory of minerals at high pressureReviews in Mineralogy, Vol. 37, pp. 639-MantleMineralogy, Petrology - experimental
DS2000-0460
2000
Hemley, R.J.Kagi, H., Lu, R., Hemley, R.J.Evidence for ice VI as an inclusion in cuboid diamonds from high pressure -temperature near infrared spectroscopy.Mineralogical Magazine, Vol. 64, No. 6, Dec. 1, pp. 1089-98.GlobalDiamond - inclusions, Diamond - morphology
DS2001-0468
2001
Hemley, R.J.Hemley, R.J., Mao, H.K.In situ studies of iron under pressure: new windows on the Earth's coreInternational Geology Review, Vol. 43, No. 1, Jan. pp. 1-30.MantleCore - mineralogy
DS2002-0704
2002
Hemley, R.J.Hemley, R.J., Mao, H.K.New windows on earth and planetary interiorsMineralogical magazine, Vol. 66,5, pp. 791-811.GlobalPetrology - mineralogy - not specific to diamonds
DS2002-0705
2002
Hemley, R.J.Hemley, R.J., Mao, H.K.New windows on earth and planetary interiorsMineralogical Magazine, Vol.66, 6, pp. 791-812.MantleCore
DS2003-0819
2003
Hemley, R.J.Lin, J.F., Heinz, D.L., Mao, H., Hemley, R.J., Devine, J.M., Shen, G.Stability of magnesiowurstite in Earth's lower mantleProceedings of the National Academy of Sciences, USA, Vol. 100, 8, pp. 4405-8.MantlePetrology
DS200412-1138
2003
Hemley, R.J.Lin, J.F., Heinz, D.L., Mao, H., Hemley, R.J., Devine, J.M., Shen, G.Stability of magnesiowurstite in Earth's lower mantle.Proceedings of National Academy of Science USA, Vol. 100, 8, pp. 4405-8.MantlePetrology
DS200512-0421
2005
Hemley, R.J.Hemley, R.J.,Chun Chen, Y., Yan, C-S.Growing diamond crystals by chemical vapor deposition.Elements, Vol. 1, 2, March pp. 105-108.CVD, HP
DS200512-0638
2005
Hemley, R.J.Lin, J.F., Struzhkin, V.V., Jacobsen, S.D., Hu, M.Y., Chow, P., Kung, J., Liu, H., Mao, H., Hemley, R.J.Spin transition of iron in magnesiowustite in the Earth's lower mantle.Nature, No. 7049, July 21, pp. 377-380.MantleMineralogy
DS200612-0338
2006
Hemley, R.J.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
DS200612-0863
2006
Hemley, R.J.Mao, W.L., Mao, H-K., Sturhahn, W., Zhao, J., Prakapenka, V.B., Meng, Y., Shu, J., Hemley, R.J.Iron rich post perovskite and the origin of ultralow-velocity zones.Science, Vol. 312, April 28, pp. 564-565.MantleGeophysics - seismics, silicate
DS201312-0373
2012
Hemley, R.J.Hazen, R.M., Hemley, R.J., Mangolin, A.J.Carbon in Earth's Interior: storage, cycling and life.EOS Transaction of AGU, Vol. 93, 2, Jan 10, 3p.MantleReservoir - diamond mentioned
DS201701-0015
2016
Hemming, G.Hulett, S.R.W., Simonetti, A., Rasbury, E.T., Hemming, G.Recycling of subducted crustal components into carbonatite melts revealed by boron isotopes.Nature Geoscience, Vol. 9, pp. 904-908.MantleMagmatism

Abstract: The global boron geochemical cycle is closely linked to recycling of geologic material via subduction processes that have occurred over billions of years of Earth’s history. The origin of carbonatites, unique melts derived from carbon-rich and carbonate-rich regions of the upper mantle, has been linked to a variety of mantle-related processes, including subduction and plume-lithosphere interaction. Here we present boron isotope (d11B) compositions for carbonatites from locations worldwide that span a wide range of emplacement ages (between ~40 and ~2,600?Ma). Hence, they provide insight into the temporal evolution of their mantle sources for ~2.6 billion years of Earth’s history. Boron isotope values are highly variable and range between -8.6‰ and +5.5‰, with all of the young (<300?Ma) carbonatites characterized by more positive d11B values (>-4.0‰), whereas most of the older carbonatite samples record lower B isotope values. Given the d11B value for asthenospheric mantle of -7 ± 1‰, the B isotope compositions for young carbonatites require the involvement of an enriched (crustal) component. Recycled crustal components may be sampled by carbonatite melts associated with mantle plume activity coincident with major tectonic events, and linked to past episodes of significant subduction associated with supercontinent formation.
DS201612-2303
2016
Hemming, N.G.Hulett, S.R.W., Simonetti, A., Rasbury, E.T., Hemming, N.G.Recyclying of subducted crustal components into carbonatite melts revealed by boron isotopes.Nature Geoscience, Nov. 7, on line 6p.GlobalCarbonatite

Abstract: The global boron geochemical cycle is closely linked to recycling of geologic material via subduction processes that have occurred over billions of years of Earth’s history. The origin of carbonatites, unique melts derived from carbon-rich and carbonate-rich regions of the upper mantle, has been linked to a variety of mantle-related processes, including subduction and plume-lithosphere interaction. Here we present boron isotope (d11B) compositions for carbonatites from locations worldwide that span a wide range of emplacement ages (between ~40 and ~2,600?Ma). Hence, they provide insight into the temporal evolution of their mantle sources for ~2.6 billion years of Earth’s history. Boron isotope values are highly variable and range between -8.6 and +5.5, with all of the young (<300?Ma) carbonatites characterized by more positive d11B values (>-4.0‰ whereas most of the older carbonatite samples record lower B isotope values. Given the d11B value for asthenospheric mantle of -7 ± 1‰ the B isotope compositions for young carbonatites require the involvement of an enriched (crustal) component. Recycled crustal components may be sampled by carbonatite melts associated with mantle plume activity coincident with major tectonic events, and linked to past episodes of significant subduction associated with supercontinent formation.
DS200612-0889
2006
Hemming, S.R.McClennan, S.M., Taylor, S.R., Hemming, S.R.Composition, differentiation, and evolution of continental crust: constraints from sedimentary rocks and heat flow.Evolution and differentiation of Continental Crust, ed. Brown, M., Rushmer, T., Cambridge Univ. Press, Chapter 2, pp. 92-134.MantleMineral chemistry
DS200612-0896
2006
Hemming, S.R.McLennan, S.M., Taylor, S.R., Hemming, S.R.Composition, differentiation and evolution of continental crust: constraints from sedimentary rocks and heat flow.Brown, M., Rushmer, T., Evolution and differentiation of the continental crust, Cambridge Publ., Chapter 4,MantleGeothermometry
DS1960-1128
1969
Hemmings, C.D.Hemmings, C.D.Upper Mantle Structure in Western CanadaPh.d. Thesis, University of Alberta, 93p. Geological Society of Canada (GSC) TN269 H34Cordillera, Alberta, British ColumbiaMantle, Tectonics, Structure
DS2000-0853
2000
HemmingwaySandeman, H., Cousens, B., Peterson, Hemmingway, davisPetrochemistry and neodymium isotopic evolution of Proterozoic mafic rocks of Western Churchill Province... mantleGeological Association of Canada (GAC)/Mineralogical Association of Canada (MAC) 2000, 4p. abstract.Northwest TerritoriesPetrology, dykes, Kaminak, MacQuid, Tulemalu
DS2003-1211
2003
Hemmingway, C.J.Sandeman, H.A., Cousens, B.L., Hemmingway, C.J.Continental tholeitic mafic rocks of the Paleoproterozoic Hurwitz Group, centralCanadian Journal of Earth Sciences, Vol. 40, 9,Sept. 1219-37.NunavutMagmatism
DS200412-1726
2003
Hemmingway, C.J.Sandeman, H.A., Cousens, B.L., Hemmingway, C.J.Continental tholeitic mafic rocks of the Paleoproterozoic Hurwitz Group, central Hearne sub-domain, Nunavut: insight into the evCanadian Journal of Earth Sciences, Vol. 40, 9,Sept. 1219-37.Canada, NunavutMagmatism
DS2001-0129
2001
Hemond, C.Bourdon, E., Hemond, C.Looking for the missing endmember in South Atlantic Ocean mantle around Ascension Island.Mineralogy and Petrology., Vol. 71, No. 1-2, pp. 127-38.MantleGondwana
DS201412-0310
2014
Hemond, C.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
DS201608-1419
2016
Hemond, C.Maia, M., Sichel, S., Briais, A., Brunelli, D., Ligi, M., Ferreira, N., Campos, T., Mougel, B., Brehme, I., Hemond, C., Motoki, A., Moura, D., Scalabrin, C., Pessanha, I., Alves, E., Ayres, A., Oliveira, P.Extreme mantle uplift and exhumation along a transpressive transform fault.Nature Geoscience, Vol. 9, 8, pp. 619-623.MantleRidges

Abstract: Mantle exhumation at slow-spreading ridges is favoured by extensional tectonics through low-angle detachment faults1, 2, 3, 4, and, along transforms, by transtension due to changes in ridge/transform geometry5, 6. Less common, exhumation by compressive stresses has been proposed for the large-offset transforms of the equatorial Atlantic7, 8. Here we show, using high-resolution bathymetry, seismic and gravity data, that the northern transform fault of the St Paul system has been controlled by compressive deformation since ~10?million years ago. The long-lived transpression resulted from ridge overlap due to the propagation of the northern Mid-Atlantic Ridge segment into the transform domain, which induced the migration and segmentation of the transform fault creating restraining stepovers. An anticlockwise change in plate motion at ~11?million years ago5 initially favoured extension in the left-stepping transform, triggering the formation of a transverse ridge, later uplifted through transpression, forming the St Peter and St Paul islets. Enhanced melt supply at the ridge axis due to the nearby Sierra Leone thermo chemical anomaly9 is responsible for the robust response of the northern Mid-Atlantic Ridge segment to the kinematic change. The long-lived process at the origin of the compressive stresses is directly linked to the nature of the underlying mantle and not to a change in the far-field stress regime.
DS201704-0632
2017
Hemond, C.Kendrick, M.A., Hemond, C., Kamenetsky, V.S., Danyushevsky, L., Devey, C.W.Seawater cycled throughout Earth's mantle in partially serpentinized lithosphere.Nature Geoscience, Vol. 10, 3, pp. 222-228.MantleGeochemistry - water

Abstract: The extent to which water and halogens in Earth’s mantle have primordial origins, or are dominated by seawater-derived components introduced by subduction is debated. About 90% of non-radiogenic xenon in the Earth’s mantle has a subducted atmospheric origin, but the degree to which atmospheric gases and other seawater components are coupled during subduction is unclear. Here we present the concentrations of water and halogens in samples of magmatic glasses collected from mid-ocean ridges and ocean islands globally. We show that water and halogen enrichment is unexpectedly associated with trace element signatures characteristic of dehydrated oceanic crust, and that the most incompatible halogens have relatively uniform abundance ratios that are different from primitive mantle values. Taken together, these results imply that Earth’s mantle is highly processed and that most of its water and halogens were introduced by the subduction of serpentinized lithospheric mantle associated with dehydrated oceanic crust.
DS200512-0751
2004
hemphillMoses, 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
DS2001-0970
2001
Hemphill, Gilbertson et. al.Reinitz, I.M., Johnson, Hemphill, Gilbertson et. al.Modeling the appearance of the round brilliant cut diamond: an analysis of fire and more about brilliance.Gems and Gemology, Vol. 37, Fall, pp. 174-97.GlobalDiamond - cutting, Brilliance
DS1998-0610
1998
Hemphill, T.S.Hemphill, T.S., Reinitz, I.M., Johnson, M.L., ShigleyModeling the appearance of the round brilliant cut diamond: an analysis ofbrilliance.Gems and Gemology, Fall pp. 158-183.GlobalDiamond cutting
DS1984-0746
1984
Hemphill, W.R.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
DS1986-0297
1986
Hempton, M.R.Gordon, M.B., Hempton, M.R.Collision induced rifting: the Grenville orogeny and The keweenawan rift of North AmericaTectonophysics, Vol. 127, No. 1-2, July 1, pp. 1-26MidcontinentTectonics
DS1999-0019
1999
HemstockArden, K.M., DePaoli, Johnson, Hemstock, AbercrombieMetallic and industrial mineral assessment report on the Athabasca permitsin northeastern Alberta.Alberta Geological Survey, MIN 19990004AlbertaExploration - assessment, Birch Mountain Resources Ltd.
DS1970-0529
1972
Henage, L.F.Henage, L.F.A Definitive Study of the Origin of LamproitesMsc. Thesis University of Oregon., United States, AustraliaLamproite, Review
DS1997-1223
1997
Hendel, R.Walzer, U., Hendel, R.Tectonic episodicity and convective feed back mechanismPhysics of the Earth and Planetary Interiors, Vol. 100, No. 1-3, pp.MantleTectonics, Plumes
DS200412-2077
2004
Hendel, R.Walzer, U., Hendel, R., Baumgardner, J.The effects of a variation of the radial viscosity profile on mantle evolution.Tectonophysics, Vol. 384, 1-4, pp. 55-90.MantleGeophysics - seismics
DS200812-1230
2008
Hendel, R.Waltzer, U., Hendel, R.Mantle convection and evolution with growing continents.Journal of Geophysical Research, Vol. 113, B09405.MantleConvection
DS200812-1231
2008
Hendel, R.Walzer, U., Hendel, R.Mantle convection and evolution with growing continents.Journal of Geophysical Research, Vol. 113, B9, B09405.MantleConvection
DS200612-0483
2006
Hendel, R.F.Gottschaldt, K.D., Walzer, U., Hendel, R.F., Stegman, D.R., Baumgartner, J.R., Muhlhaus, H.B.Stirring in 3 d spherical models of convection in the Earth's mantle.Philosophical Magazine, Vol. 86, no. 21-22, pp. 3175-3204.MantleConvection
DS1996-1541
1996
HendersonWilkinson, 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
DS202011-2041
2013
Henderson, B.Henderson, B., Collins, A.S., Payne, J., Forbes, C., Saha, D.Geological and geochemistry constraining India in Columbia: the age, isotopic provenance and geochemistry of the protoliths of the Ongole Domain, southern eastern Ghats, India. *** NOTE DATEGondwana Research, in press available. 19p. PdfIndiaNuna

Abstract: The Ongole Domain in the southern Eastern Ghats Belt of India formed during the final stages of Columbia amalgamation at ca. 1600 Ma. Yet very little is known about the protolith ages, tectonic evolution or geographic affinity of the region. We present new detrital and igneous U-Pb-Hf zircon data and in-situ monazite data to further understand the tectonic evolution of this Columbia-forming orogen. Detrital zircon patterns from the metasedimentary rocks are dominated by major populations of Palaeoproterozoic grains (ca. 2460, 2320, 2260, 2200-2100, 2080-2010, 1980-1920, 1850 and 1750 Ma), and minor Archaean grains (ca. 2850, 2740, 2600 and 2550 Ma). Combined U-Pb ages and Lu-Hf zircon isotopic data suggest that the sedimentary protoliths were not sourced from the adjacent Dharwar Craton. Instead they were likely derived from East Antarctica, possibly the same source as parts of Proterozoic Australia. Magmatism occurred episodically between 1.64 and 1.57 Ga in the Ongole Domain, forming felsic orthopyroxene-bearing granitoids. Isotopically, the granitoids are evolved, producing eHf values between - 2 and - 12. The magmatism is interpreted to have been derived from the reworking of Archaean crust with only a minor juvenile input. Metamorphism between 1.68 and 1.60 Ga resulted in the partial to complete resetting of detrital zircon grains, as well as the growth of new metamorphic zircon at 1.67 and 1.63 Ga. In-situ monazite geochronology indicates metamorphism occurred between 1.68 and 1.59 Ga. The Ongole Domain is interpreted to represent part of an exotic terrane, which was transferred to proto-India in the late Palaeoproterozoic as part of a linear accretionary orogenic belt that may also have included south-west Baltica and south-eastern Laurentia. Given the isotopic, geological and geochemical similarities, the proposed exotic terrane is interpreted to be an extension of the Napier Complex, Antarctica, and may also have been connected to Proterozoic Australia (North Australian Craton and Gawler Craton).
DS1986-0247
1986
Henderson, C.M.B.Foland, K.A., Henderson, C.M.B.Crustal contamination during genesis of the Mont. St. Hilairealkaline igneous complex, QuebecEos, Vol. 67, No. 16, April 22, p. 389. (abstract.)QuebecNepheline syenite, Alkaline rocks
DS1989-0435
1989
Henderson, C.M.B.Foland, K.A., Chen, J.-F, Linder, J.S., Henderson, C.M.B., WhillansHigh resolution 40Ar/39Ar chronology of multiple intrusion igneouscomplexes, . Application to the Cretaceous Mount Brome complex, Quebec, CanadaContributions to Mineralogy and Petrology, Vol. 102, No. 2, pp. 127-137QuebecMount Brome, Igneous complex
DS1989-0621
1989
Henderson, C.M.B.Henderson, C.M.B., Ezepue, M.J.Petrogenesis of the dyke suite from the Marangudzialkaline igneous ringcomplex, ZimbabweGeological Society of India, Memoir, Editor C. LeelanandaM., No. 15, pp. 83-116ZimbabweAlkaline rocks, Basanite-pseudoleucite ri
DS1991-0898
1991
Henderson, C.M.B.Kogarko, L.N., Plant, D.A., Henderson, C.M.B., Kjarsgaard, B.A.Sodium rich carbonate inclusions in perovskite and calzirtite from the Guli intrusive Ca-carbonatite, Polar SiberiaContributions to Mineralogy and Petrology, Vol. 109, No. 1, pp. 124-129Russia, SiberiaCarbonatite, Carbonate inclusions
DS1991-0899
1991
Henderson, C.M.B.Kohn, S.C., Dupree, R., Mortuza, M.G., Henderson, C.M.B.An NMR study of structure and ordering in synthetic K2gSi5O12, a leuciteanaloguePhys. Chem. Minerals, Vol. 18, pp. 144-152GlobalMineral chemistry, Leucite
DS1994-0291
1994
Henderson, C.M.B.Chen, J., Henderson, C.M.B., Foland, K.A.Open system, subvolcanic magmatic evolution: constraints on the petrogenesis Mount Brome alkaline C.Journal of Petrology, Vol. 35, No. 4, pp. 1127-1153.QuebecAlkaline complex, Deposit -Mount Brome
DS1994-0529
1994
Henderson, C.M.B.Foland, K.A., Landoll, .J.D., Henderson, C.M.B.Some consequences of interaction between mantle magmas and crust in the formation of epizonal alkaline complexes.Geological Association of Canada (GAC) Abstract Volume, Vol. 19, p.MantleAlkaline rocks
DS1994-0976
1994
Henderson, C.M.B.Landoll, J.D., Foland, K.A., Chen, J-F., Henderson, C.M.B.The role of crustal contamination in the formation of silica oversaturated rocks in the Montregian Hills province, Quebec.Geological Association of Canada (GAC) Abstract Volume, Vol. 19, p. posterQuebecAlkaline rocks, Montregian Hills
DS1995-0986
1995
Henderson, C.M.B.Kogarko, L.N., Pacheco, H., Henderson, C.M.B.Primary Calcium rich carbonatite magma, carbonate -silicate -sulphide liquid immiscibility in the upper mantle.Contributions to Mineralogy and Petrology, Vol. 121, No. 3, pp. 267-274.GlobalCarbonatite
DS1995-0989
1995
Henderson, C.M.B.Kohn, S.C., Henderson, C.M.B., Dupree, R.Si-Al order in leucite revisited: new information from an analcite derivedanalogue.American Mineralogist, Vol. 80, July-Aug. No. 7-8, pp. 705-714.GlobalMineralogy, Leucite
DS1996-0521
1996
Henderson, C.M.B.Gibb, F.G.F., Henderson, C.M.B.Magmatic processes - introductionMineralogical Magazine, Vol. 60, No. 1, Feb pp. 1-4GlobalMagmatic processes
DS1996-0622
1996
Henderson, C.M.B.Henderson, C.M.B., Foland, K.A.Barium and Titanium rich primary biotite from the Brome alkaline igneous complex, Montregian Hills: substitution ...Canadian Mineralogist, Vol. 34, pt. 6, pp. 1241-52.QuebecSpectroscopy, Mechanisms -substitution
DS1999-0304
1999
Henderson, C.M.B.Henderson, C.M.B., Kogarko, L.N., Plant, D.A.Extreme closed system fractionation of volatile rich ultrabasic peralkaline melt inclusions .. djerfisheriteMineralogical Magazine, Vol. 63, No. 3, June, pp. 433-GlobalKugda alkaline complex
DS201212-0293
2012
Henderson, C.M.B.Henderson, C.M.B., Richardson, F.R., Charnock, J.M.The Highwood Mountains potassic igneous province, Montana: mineral fractionation trends and magmatic processes revisited.Mineralogical Magazine, Vol. 76, 4, pp. 1005-1051.United States, MontanaHighwood Mountains
DS1989-0622
1989
Henderson, C.M.R.Henderson, C.M.R., Pendlebury, K., Foland, K.A.Mineralogy and petrology of the Red Hill alkaline igneous complex, NewHampshire, United States (US)Journal of Petrology, Vol. 30, No. 3, June pp. 627-666GlobalAlkaline rocks, Red Hill complex
DS2001-0469
2001
Henderson, D.M.Henderson, D.M.New visualization of global tectonic plate motions and plate boundary interactionsTerra Nova, Vol. 13, pp. 70-8.MantleTectonics, Plate - boundary
DS1930-0305
1939
Henderson, E.P.Ksanda, C.J., Henderson, E.P.Identification of Diamond in the Canon Diablo IronAmerican MINERALOGIST., Vol. 24, PP. 677-680.United States, Arizona, Colorado PlateauMeteorite
DS201412-0353
2014
Henderson, G.A.Henderson, G.A., Neuville, D.R.Spectroscopic methods in mineralogy and materials sciences. Mineralogical Society of America, Vol. 78, 763p. $ 50.00TechnologyBook - spectroscopy
DS200612-0566
2005
Henderson, G.S.Henderson, G.S.The structure of silicate melts: a glass perspective.The Canadian Mineralogist, Vol. 43, 6, Dec. pp. 1921-1958.TechnologySilicate melts
DS200712-0428
2006
Henderson, G.S.Henderson, G.S., Calas, G., Stebbins, J.F.The structure of silicate glasses and melts.Elements, Vol. 2, 5, October pp. 269-274.TechnologyGeochemistry
DS201112-0863
2010
Henderson, G.S.Richet, P., Henderson, G.S., Neuville, D.R.Thermodynamics: the oldest branch of earth sciences?Elements, Vol. 6, pp. 287-292.MantleGeothermometry
DS201712-2710
2017
Henderson, G.S.Nesbitt, H.W., Cormack, A.N., Henderson, G.S.Defect contributions to the heat capacities and stabilities of some chain, ring, and sheet silicates, with implications for mantle minerals.American Mineralogist, Vol. 102, pp. 2220-2229.Mantlemineralogy

Abstract: At temperatures less than ~1500 K, previously published CP data demonstrate that the heat capacities of orthoenstatite, proto-enstatite, diopside, and pseudowollastonite include primarily Debye type vibrational and anharmonic contributions, whereas the alkali chain, sheet, and ring silicates, Na2SiO3, Li2SiO3, K2SiO3, and Na2Si2O5 include a third contribution. The third contribution to CP arises from defect formation due to the mobility Na, K, Li, and O2-. The contribution becomes apparent at temperatures above 700-800 K for Na and K silicates, and above 900-1000 K for Li metasilicate. With strong thermal agitation, alkali-non-bridging oxygen (NBO) bonds are ruptured with the cations exiting their structural sites to occupy interstitial sites, thereby producing intrinsic Frenkel defects, which contribute to the CP of the alkali silicates. The magnitudes of the CP defect contributions correlate inversely with cation-oxygen bond strengths, as measured by bond dissociation energies. K-O and Na-O bond strengths are weak (239 and 257 kJ/mol) and defect contributions are large for these alkali chain, ring, and sheet silicates. The greater bond strength of Li-O (341 kJ/mol) correlates with a weaker defect contribution to the CP of Li2SiO3. Mg-O and Ca-O bonds are stronger still (394 and 464 kJ/mol) and no CP defect contributions are observed for the pyroxenes and pseudowollastonite up to ~1500 K. Above ~800 K a polymerization reaction occurs in Na2SiO3, which produces some Q3 species and free oxygen (O2- or oxide ion). The polymerization reaction annihilates an oxygen structural site so that the O2- produced must reside on non-structural sites thus producing intrinsic anionic defects. The same reactions likely occur in Na2Si2O5 and K2SiO3. Raman spectra of Na2SiO3 indicate >10% of Na+ and ~1.7% of O2- on interstitial sites at 1348 K. Ca- and Mg-bearing mantle minerals subjected to temperature greater than ~1500 K experience the destabilizing effects of disordering (Frenkel defect formation). The minerals may respond either by changing their composition or by changing phase. An abundance of Ca and Na defects in pyroxenes, for example, likely promotes production of new components (e.g., CaAl2SiO6, NaAlSi2O6) in pyroxenes. By their production, Ca and Na defect concentrations are reduced thereby stabilizing the phases. Mg-O bond dissociation and production of intrinsic Mg2+ and O2- point defects within olivine likely destabilize it and promote the phase transition to wadsleyite at the base of the upper mantle.
DS1930-0064
1931
Henderson, H.Henderson, H.Diamonds and de BeersChamber's Journal, Vol. 7, AUGUST, No. 21, PP. 504-506.South AfricaMining Economics
DS200612-1358
2006
Henderson, I.St.Onge, M.R., Jackson, G.D., Henderson, I.Geology, Baffin Island south of 70 N and east of 80 W.Geological Survey of Canada, No. 4931, 1 CD $ 9.10Canada, NunavutBedrock data
DS200812-1213
2008
Henderson, I.H.C.Viola, G., Henderson, I.H.C., Bingen, B., Thomas, R.J., Smethurst, M.A., De Azavedo, S.Growth and collapse of a deeply eroded orogen: insights from structural, geophysical, and geochronological constraints on Pan-African evolution of NE Mozambique.Tectonics, Vol. 27, TC5009Africa, MozambiqueGeochronology
DS1970-0559
1972
Henderson, J.Mcglynn, J., Henderson, J.The Slave ProvinceGeological Association of Canada (GAC) Special paper, No. 11, pp. 506-26.Northwest TerritoriesGeology - Overview
DS201812-2862
2018
Henderson, J.Peters, M.H., Henderson, J.Bridging the gap through care and collaboration: before closure and after production. Snap Lake2018 Yellowknife Geoscience Forum , pp. 60-61. abstractCanada, Northwest territoriesdeposit - Snap Lake

Abstract: Wikipedia defines “Care and Maintenance” as a term used in the mining industry to describe processes and conditions on a closed mine site where there is potential to recommence operations at a later date. During a care and maintenance phase, production is stopped but the site is managed to ensure it remains in a safe and stable condition. De Beers Canada Inc. - Snap Lake Mine entered the Care and Maintenance phase after production ceased in December 2015. The partnership with Det'on Cho Corporation provides for a sustainable execution of care and maintenance activities, taking into consideration approved work plans, mine health and safety considerations and emergency response plans. The mine is currently in its third year of care and maintenance. After exploring the potential sale of the asset and assessing the possibility of reopening the mine, the decision to proceed toward closure was taken in December 2017, ushering Snap Lake into a period of extended care and maintenance (ECM) while a closure plan is developed and finalized. Activities during ECM include monitoring of water quality and other environmental parameters, collecting/treating effluent and making sure that water leaving the site meets water license compliance. Physical infrastructure such as the airstrip, roads, buildings, processed kimberlite containment facilities and associated surface water infrastructure such as sumps, pumps and channels need to be kept in a safe and operable condition. Camp infrastructure such as generators and machinery and equipment are also part of the Care and Maintenance program. Collaboration between the De Beers Canada owner's team and Det'on Cho Corporation resulted in the safe execution of the 2018 work plan which included freshet operations, continued progressive reclamation work, monitoring and maintenance activities. After a trial-run of reduced camp occupancy in the winter of 2017, the site was fully winterized and demobilized in September 2018 to allow for monthly site visits for the duration of the winter and planning for a spring 2019 start-up.
DS1860-0990
1897
Henderson, J.A.Henderson, J.A.On a New Occurrence of Apophyllite in South AfricaMineralogical Magazine., Vol. 11, DECEMBER PP. 318-322. ALSO: Neues Jahrbuch fnr Mineralogie BD. 1Africa, South AfricaCrystallography, Mineralogy
DS1900-0761
1909
Henderson, J.M.Henderson, J.M.Discussion on Paper by Harger "the Occurrence of Diamonds In the Dwyka Congomerate".Geological Society of South Africa Proceedings, Vol. 12, P. XLIX.Africa, South AfricaDiamond Genesis
DS1900-0762
1909
Henderson, J.M.Henderson, J.M.Discussion on Paper by Merensky " the Diamond Deposits of Luderitzland".Geological Society of South Africa Proceedings, Vol. 12, P. XXXIX.Africa, NamibiaMarine Diamond Placers
DS1910-0191
1911
Henderson, J.M.Henderson, J.M.Anniversary Address by the PresidentGeological Society of South Africa Proceedings, Vol. 13, PP. XXI-XXXIV.South AfricaGenesis
DS1960-0359
1963
Henderson, J.R.Keller, F.JR., Henderson, J.R., et al.Aeromagnetic Map of the Magnet Cove Area, Hot Spring County, Arkansaw.United States Geological Survey (USGS) MAP, No. GP 409, 1: 24, 000.United States, Gulf Coast, Arkansas, Hot Spring CountyGeophysics
DS1990-0684
1990
Henderson, J.R.Henderson, J.R., Broome, J.Geometry and kinematics of Wager shear zone interpreted from structural fabrics and magnetic data.Canadian Journal of Earth Sciences, Vol. 27, pp. 590-604.GlobalTectonics, Geophysics - magnetics
DS1997-0501
1997
Henderson, J.R.Henderson, J.R., henderson, M.N., Kerswill, J.A., DehlsGeology of High Lake greenstone belt, District of MackenzieGeological Society of Canada (GSC) Open File, OF. 3401, approx. $ 20.00Northwest TerritoriesBook - ad, Greenstone belt
DS1997-1211
1997
Henderson, J.R.Villeneuve, M.E., Henderson, J.R., Hrabi, R.B., Jackson2.80-2.58 Ga plutonism and volcanism in the Slave ProvinceGeological Survey of Canada (GSC) Paper, No. 1997-F, pp. 37-60.Northwest TerritoriesGeochronology, Craton - Slave
DS1997-1212
1997
Henderson, J.R.Villeneuve, M.E., Henderson, J.R., Hrabi, R.B., Jackson2.70 - 2.58 Ga plutonism and volcanism in the Slave Province, District ofMackenzie, Northwest Territories.Geological Society of Canada (GSC) Paper, No. 1997-F, p. 37-60.Northwest TerritoriesGeochronology, Magma activity
DS1995-0983
1995
Henderson, M.Kogarko, L.N., Henderson, M., Pacheco, A.H.Primary Ca-rich carbonatite magma and carbonate silicate sulphide liquidimmiscibility in upper mantle.Geological Society Africa 10th. Conference Oct. Nairobi, p. 113-4. Abstract.GlobalCarbonatite, Deposit -Montana Clara
DS1997-0501
1997
henderson, M.N.Henderson, J.R., henderson, M.N., Kerswill, J.A., DehlsGeology of High Lake greenstone belt, District of MackenzieGeological Society of Canada (GSC) Open File, OF. 3401, approx. $ 20.00Northwest TerritoriesBook - ad, Greenstone belt
DS1986-0357
1986
Henderson, P.Henderson, P., Selo, M., Storzer, D.An investigation of olivine crystal growth in a picrite dike using the fission track methodMineralogical Magazine, Vol. 50, No. 1, No. 355, March pp. 27-33GlobalPicrite
DS1997-0155
1997
Henderson, P.Campbell, L.S., Henderson, P.Apatite paragenesis in the Bayan Obo rare earth elements (REE) niobium iron ore deposit, Inner China.Lithos, Vol. 42, No. 1-2, Dec. 1, pp. 89-104.China, MongoliaCarbonatite, Deposit - Bayan Obo
DS1999-0684
1999
Henderson, P.Smith, M.P., Henderson, P., Zhang, P.Reacyion relationships in the Bayan Obo rare earth elements (REE) niobium deposit, Inner Mongolia: implications for stability rare earth elements (REE)Contributions to Mineralogy and Petrology, Vol. 134, No. 2-3, pp. 294-310.China, MongoliaCarbonates, phosphates, rare earths, Deposit - Bayan Obo
DS200712-0133
2007
Henderson, P.Campbell, L.S., Wall, F., Henderson, P., Zhang, P., Tao, K., Yang, Z.The character and context of zircons from the Bayan Obo Fe Nb REE deposit, Inner Mongolia.Frontiers in Mineral Sciences 2007, Joint Meeting of Mineralogical societies Held June 26-28, Cambridge, Abstract Volume p. 97-98.Asia, MongoliaCarbonatite
DS200712-0134
2007
Henderson, P.Campbell, L.S., Wall, F., Henderson, P., Zhang, P., Tao, K., Yang, Z.The character and context of zircons from the Bayan Obo Fe Nb REE deposit, Inner Mongolia.Frontiers in Mineral Sciences 2007, Joint Meeting of Mineralogical societies Held June 26-28, Cambridge, Abstract Volume p. 97-98.Asia, MongoliaCarbonatite
DS1999-0685
1999
Henderson, P.H.Smith, M.P., Henderson, P.H.Fluid inclusion constraints on the genesis of the Bayan Obo iron rare earth elements (REE) niobium deposit .Stanley, SGA Fifth Biennial Symposium, pp. 103-6.ChinaCarbonatite, Geochronology
DS1996-0623
1996
Henderson, P.J.Henderson, P.J.Kimberlite indicator mineral dat a from Bissett-English -Brook-Wallace Lake area 62P, 1, 52L1, 52M3, 4 Rice Lake gsGeological Survey of Canada Open File, No. 3367, 23p. $ 9.00ManitobaGeochemistry, Kimberlite indicator minerals
DS2002-1034
2002
Henderson, P.J.McMartin, I., Henderson, P.J.Re-interpretation of the ice flow history within the Keewatin sector of the Laurentide ice sheet: results from the western Churchill Natmap project.30th. Yellowknife Geoscience Forum, Abstracts Of Talks And Posters, Nov. 20-22, p. 46. abstractNorthwest TerritoriesGeomorphology
DS2003-0918
2003
Henderson, P.J.McMartin, I., Henderson, P.J., Kjarsgaard, B.K., Venance, K.Regional distribution and chemistry of kimberlite indicator minerals, Rankin In let andGeological Survey of Canada Open File, No. 1575, 1 CD Rom 110p. report 60p. of appendices $40.NunavutMineral chemistry
DS201602-0211
2015
Henderson, R.Henderson, R.The first gravity meter designed, built and used in Australia in the late 1890's and very possibly the first in the world.Preview ( Geophysics), December pp. 53-61.AustraliaHistory - gravity meter
DS1940-0086
1944
Henderson, R.H.Henderson, R.H.An Ulsterman in AfricaCape Town: Union Volkspers Ltd., South AfricaHistory, Kimberley
DS1992-0698
1992
Henderson, W.A.Henderson, W.A.Hercynite crystals from the Kimzey calcite Quarry Magnet Cove, Arkansaw...and theri distinction from perovskiteRocks and Minerals, Vol. 67, No. 6, November-December pp. 402-404ArkansasPerovskite, Carbonatite
DS1997-0524
1997
Henderson-Sellers, A.Howe, W., Henderson-Sellers, A.Assessing climate changeGordon and Breach Publ, 430p. approx. $ 150.00GlobalBook - ad, Climate change
DS1984-0236
1984
Hendey, Q.Dingle, R.V., Hendey, Q.Late Mesozoic and Tertiary Sediment Supply to the Eastern Cape Basin southeast Atlantic and Palaeo-drainage Systems in South We Sout Africa.Marine Geology, Vol. 56, No. 1-4, PP. 13-26.South Africa, Orange River, Namaqualand, Southwest AfricaGeomorphology, Submarine Diamond Placers, Sedimentology
DS1992-0699
1992
Hendrick, K.C.Hendrick, K.C.The environmental challenge of growthMinerals Industry International, No. 1006, May pp. 17-21GlobalEconomics, Mineral industries -environmental issues
DS1992-0700
1992
Hendricks, C.Hendricks, C., Scoble, M.J., Boudreault, F., Szymanski, J.Blasthole stoping: drilling accuracy and measurementTransactions of the Institute of Mining and Metallurgy (IMM), Vol. 101, Sept-Dec, pp. A 173-186GlobalDrilling -blasthole stoping, Overview of advances
DS1994-0759
1994
Hendricks, C.Hendricks, C., Scobie, M., Boudreault, F.A study of blasthole drilling accuracy: monitoring instrumentation andpracticeThe Canadian Mining and Metallurgical Bulletin (CIM Bulletin), Vol. 87, No. 977, February pp. 60-66ManitobaDrilling, Mining -dilution
DS1980-0174
1980
Hendricks, J.D.Hildenbrand, T.G., Kucks, R.P., Kane, M.F., Hendricks, J.D.Aeromagnetic Map and Associated Depth Map of the Upper Mississippi Embayment Region.United States Geological Survey (USGS) miscellaneous FIELD MAP, No. MF-1158, 1: 1, 000, 000.GlobalMid-continent
DS1981-0232
1981
Hendricks, J.D.Kane, M.F., Hildenbrand, T.G., Hendricks, J.D.A Model for the Tectonic Evolution of the Mississippi Embayment and its Contempory Seismicity.Geology, Vol. 9, No. 12, PP. 563-568.GlobalMid-continent
DS1982-0277
1982
Hendricks, J.D.Hildenbrand, T.G., Kane, M.F., Hendricks, J.D.Magnetic Basement in the Upper Mississippi Embayment Region-a Preliminary Report.United States Geological Survey (USGS) PROF. PAPER., No. 1236-E.GlobalMid-continent
DS1989-0623
1989
Hendricks, J.D.Hendricks, J.D.Map showing bouguer gravity and generalized geology of Arkansaw. Kimberlite mentioned p. 21United States Geological Survey (USGS) Prof. Paper, No. 1474, and map 1: 1, 1000, 000 $ 4.00ArkansasGeophysics -gravity, Geology map
DS1992-0379
1992
Hendricks, J.D.Donovan-Ealy, P.F., Hendricks, J.D.Gravity and magnetic anomalies associated with Tertiary volcanism and a Proterozoic crustal boundary, Hopi Buttes volcanic field, Navajo Nation, ArizonaGeological Society of America (GSA) Abstracts with programs, 1992 Annual, Vol. 24, No. 7, abstract p. A82ArizonaGeophysics -magnetics, volcanism.
DS1995-0798
1995
Hendricks, J.D.Hildenbrand, T.G., Hendricks, J.D.Geophysical setting of the Reelfoot Rift and relations between rift structures and the New Madrid seismic zoneUnited States Geological Survey (USGS) Paper, No. 1538-E, 30p. $ 3.50Arkansas, Missouri, Midcontinent, MississippiGeophysics -seismics, Tectonics, Mid continent Rift
DS1995-0799
1995
Hendricks, J.D.Hildenbrand, T.G., Hendricks, J.D.Geophysical setting of the Reelfoot Rift and relations bewteen rift structures and the New Madrid seismic zoneUnited States Geological Survey (USGS) Paper, No. 1538-E, 30p. $ 3.50Missouri, Arkansas, Tennessee, KentuckyTectonics, Mid continent rifting
DS201312-0199
2013
Hendriks, B.De Min, A., Hendriks, B., Siejko, F., Comin-Chiaramonti, P., Girardi, V., Ruberti, E., Gomes, C.B., Neder, R.D., Pinho, F.C.Age of ultramafic high K rocks from Planalto da Serra ( Mato Grosso, Brazil).Journal of South American Earth Sciences, Vol. 41, pp. 57-64.South America, BrazilGeochronology
DS201112-0280
2011
Hendriks, B.W.HDominguez, A.R., Van der Voo, R., Torsvik, T.H., Hendriks, B.W.H, Abrajevitch, A., Domeier, M., Larsen, B.T., Rousse, S.The ~270 Ma paleolatitude of Baltica and its significance for Pangea models.Geophysical Journal International, In press availableEurope, Baltic ShieldGeochronology
DS200512-0898
2005
Hendriks, B.W.H.Redfield, T.F., Osmundsen, P.T., Hendriks, B.W.H.The role of fault reactivation and growth in the uplift of western Fennoscandia.Journal of the Geological Society, Vol. 162, 6, pp. 1013-1030.Europe, FinlandTectonics
DS1993-0258
1993
Hendriks, M.Clark, J.A., Hendriks, M., Timmermans, T.J., Struck, C., Hilverda, K.J.Glacial isostatic deformation of the Great Lakes regionGeological Society of America Bulletin, Vol. 106, No. 1, January pp. 19-31.OntarioGeomorphology, Sea level changes, isostasy
DS2001-0470
2001
Hendrix, M.S.Hendrix, M.S., Davis, G.A.Paleozoic and Mesozoic tectonic evolution of central and eastern Asia: continental assembly /deformationGeological Society of America, Publication, MWR No. 194, 454p. $ 160.00AsiaBook - ad, Tectonics
DS2001-0471
2001
Hendrix, M.S.Hendrix, M.S., Davis, G.A.Paleozoic and Mesozoic tectonic evolution of central Asia: from continental assembly to intracontinental...Geological Society of America Memoir, No. 194, 440p.AsiaBook - table of contents
DS1990-1459
1990
HendryThompson, R.N., Leat, P.T., Dickin, A.P., Morrison, M.A., HendryStrongly potassic mafic magmas from lithospheric mantle sources duringEarth and Planetary Science Letters, Vol. 98, pp. 139-153ColoradoMinettes, Chemistry
DS1991-0572
1991
HendryGibson, S.A., Thompson, R.N., Leat, P.T., Morrison, M.A., HendryUltrapotassic magmas along the flanks of the oligo-miocene Rio Grande @Proceedings of Fifth International Kimberlite Conference held Araxa June, pp. 133-135Colorado PlateauTectonics, Kimberlites, minettes
DS1993-0541
1993
HendryGibson, S.A., Thompson, R.N., Leat, P.T., Morrison, M.A., HendryUltrapotassic magmas along the flanks of the Oligo-Miocene Rio GrandeJournal of Petrology, Vol. 34, No. 1, February pp. 187-228Mantle, Colorado PlateauUltrapotassic, Tectonics
DS1987-0492
1987
Hendry, G.L.Morrison, M.A., Hendry, G.L., Leat, P.T.Regional and tectonic implications of parallel Caledonian and Permo Carboniferous lamprophyre dyke swarms from Lismore, ArdgourTransactions Royal Society. Edinburgh, Vol. 77, pp. 279-288ScotlandDyke, Shoshonite
DS1988-0412
1988
Hendry, G.L.Leat, P.T., Thompson, R.N., Morrison, M.A., Hendry, G.L., DickinSilicic magmas derived by fractional crystallizationfromMioceneminette, Elkhead Mountains, ColoradoMineralogical Magazine, Vol. 52, No. 368, pt. 5, December pp. 577-586ColoradoMinette
DS1988-0413
1988
Hendry, G.L.Leat, P.T., Thompson, R.N., Morrison, M.A., Hendry, G.L., DickinCompositionally -diverse Miocene -Recent rift related magmatism inJournal of Petrology, Special Volume 1988- Oceanic and Continental, pp. 351-377ColoradoTectonics, Rift
DS1989-0864
1989
Hendry, G.L.Leat, P.T., Thompson, R.N., Morrison, M.A., Hendry, G.L., DickinIdentification of magma sources in continental maficmagmatism: the Rio Grande RiftNew Mexico Bureau of Mines Bulletin., Continental Magmatism Abstract Volume, Held, Bulletin. No. 131, p. 160. AbstractColorado PlateauTectonics
DS1991-0967
1991
Hendry, G.L.Leat, P.T., Thompson, R.N., Morrison, M.A., Hendry, G.L., DickinAlkaline hybrid mafic magmas of the Yampa area, northwest Colorado, and their relationship to the Yellowstone mantle plume and lithospheric mantle domainsContributions to Mineralogy and Petrology, Vol. 107, No. 3, pp. 310-327ColoradoAlkaline rocks, Mantle plumes
DS1900-0194
1903
Heneage, E.F.Heneage, E.F.The Phenomena of the Diamondiferous Deposits in South Africa #2Institute of Mining and Metallurgy. Transactions, Vol. 12, PP. 115-139. ALSO: MIN. Journal of, Vol. 72, P.Africa, South AfricaGeology
DS1900-0117
1902
Heneage, E.J.Heneage, E.J.Sopra I Depositi Diamantiferi Dell' Africa Meridionale. Riassunto Da Communicazione Di Heneage.Rass. Mineraria Torino, Vol. 17, PP. 292-295.Africa, South AfricaDiamonds, Geology
DS201112-0430
2011
Heneyi, G.Heneyi, G., Godard, V., Cattin, R., Connolly, J.A.D.Incorporating metamorphism in geodynamic models: the mass conservation problem.Geophysical Journal International, In press available,MantleTectonics
DS201809-2036
2018
Henger, F.E.Hoover, D.B., Karfunkel, J., Walde, D., Moraes, R.A.V., Michelfelder, G., Henger, F.E., Ribeira, L.C., Krambock, K.The Alto Paranaiba region, Brazil: a continuing source for pink diamonds?The Australian Gemmologist, Vol. 26, 9-10, pp. 196-204.South America, Brazildeposit - Alto Paranaiba
DS200512-0685
2003
Hengweng, Z.Marakushev, A.A., Lonkan, S., Bobrov, A.V., Hengweng, Z., Fu, L.Evolution of the SuLu eclogite ultramafic foldbelt in East China.Moscow University Geology Bulletin, Vol. 58, 6, pp. 33-46.ChinaUHP
DS1994-0760
1994
Henharen, P.Henharen, P., Stephenson, M.Russian vs western recovery plantsThe Canadian Institute of Mining, Metallurgy and Petroleum (CIM) Section Meeting Oct. 12, Vancouver, List of speakersGlobalUpdate, Mineral processing
DS1994-0761
1994
Henharen, P.A.Henharen, P.A., Popplewell, G., Shirley, J.M., Stephenson, M.Diamond processing - design considerations for the Northwest TerritoriesBateman Preprint paper handout at The Canadian Institute of Mining, 40p.Northwest TerritoriesDiamond recovery, Mineral processing
DS1992-0701
1992
Henheron, P.Henheron, P.Diamond processingInternational Roundtable Conference on Diamond Exploration and Mining, held, pp. 150-173GlobalMining, Mineral processing
DS2003-0641
2003
Henin, O.Jahn, B., Fan, Q., Yang, J.J., Henin, O.Petrogenesis of the Maowu pyroxenite eclogite body from the UHP metamorphicLithos, Vol. 70, 3-4, pp. 243-67.ChinaUHP, geochronology
DS200412-0898
2003
Henin, O.Jahn, B., Fan, Q., Yang, J.J., Henin, O.Petrogenesis of the Maowu pyroxenite eclogite body from the UHP metamorphic terrane of Dabie Shan: chemical and isotopic constraLithos, Vol. 70, 3-4, pp. 243-67.ChinaUHP, geochronology
DS1992-0702
1992
Henjeskunst, F.Henjeskunst, F., Altherr, R.Metamorphic petrology of xenoliths from Kenya and northern Tanzania And implications for geotherms and lithospheric structuresJournal of Petrology, Vol. 33, No. 5, October pp. 1125-1156Tanzania, KenyaXenoliths, GeotherM.
DS1998-0611
1998
Henjes-Kunst, F.Henjes-Kunst, F., Markl, G.Charnockitic intrusive rocks and related lamprophyres in central DronningMaud Land, East Antarctica...Journal of African Earth Sciences, Vol. 27, 1A, p. 110. AbstractAntarcticaMagmqatisM., Pan-African Orogeny
DS1999-0330
1999
Henjes-Kunst, F.Jacobs, J., Thomas, R.J., Henjes-Kunst, F.Age and thermal evolution of the Mesoproterozoic Cape Meredith Complex, West Falkland.Journal of Geological Society of London, Vol. 156, No. 3, May pp. 917-28.GlobalGeochronology
DS201112-0271
2011
Henjes-Kunst, F.Do Cabo, V., Sitnikova, M.A., Ellmies, R., Wall, F., Henjes-Kunst, F., Gerdes, A.Geological and geochemical characteristics of carbonatites of Lofdal, Namibia.Peralk-Carb 2011, workshop held Tubingen Germany June 16-18, PosterAfrica, NamibiaCarbonatite
DS201112-0272
2011
Henjes-Kunst, F.Do Cabo, V., Sitnikova, M.A., Elmies, R., Wall, F., Henjes-Kunst, F., Gerdes, A.Geological and geochemical characteristics of carbonatites of Lofdal, NamibiaPeralk-Carb 2011... workshop June 16-18, Tubingen, Germany, Abstract p.140-143.Africa, NamibiaLofdal
DS201112-0273
2011
Henjes-Kunst, F.Do Cabo, V., Sitnikova, M.A., Elmies, R., Wall, F., Henjes-Kunst, F., Gerdes, A.Geological and geochemical characteristics of carbonatites of Lofdal, NamibiaPeralk-Carb 2011... workshop June 16-18, Tubingen, Germany, Abstract p.140-143.Africa, NamibiaLofdal
DS201112-0274
2011
Henjes-Kunst, F.Do Cabo, V.N., Wall, F., Sitnikova, M.A., Ellmies, R., Henjes-Kunst, F., Gerdes, A., Downes, H.Mid and heavy REE in carbonatites at Lofdal, Namibia.Goldschmidt Conference 2011, abstract p.770.Africa, NamibiaCarbonatite, dykes
DS201312-0923
2013
Henjes-Kunst, F.Tribuzio, R., Henjes-Kunst, F., Braga, R., Tiepolo, M.Boninite derived mafic ultramafic intrusives from northern Victoria Land ( Antarctica): implications for mantle source metasomatism.Goldschmidt 2013, 1p. AbstractAntarcticaBoninites
DS1988-0299
1988
Henk, A.Henk, A., Lorenz, V.Experimental modelling of Maar-diatreme formationTerra Cognita, Vol. 8, No. 1, Winter 1988 p. 65. Abstract onlyGlobalBlank
DS1984-0754
1984
Henk, F.H.JR.Walper, J.L., Henk, F.H.JR.Double Indentation Tectonic Model for Suturing of North And south America and Formation of the Ouachita Orogenic Belt.Geological Society of America (GSA), Vol. 16, No. 2, FEBRUARY P. 116. (abstract.).GlobalMid-continent
DS1991-0706
1991
Henkel, H.Henkel, H.Magnetic crustal structures in northern FennoscandiaTectonophysics, Vol. 192, No. 1-2, June 10, pp. 57-80Norway, SwedenGeophysics -magnetics, Structure
DS1994-0762
1994
Henkel, H.Henkel, H.Standard diagrams of magnetic properties and density - a tool for understanding magnetic petrologyJournal of Applied Geophysics, Vol. 32, pp. 43-53Norway, Finland, SwedenPetrology, Geophysics -magnetics
DS1998-0612
1998
Henkel, H.Henkel, H., Reimold, W.U.Integrated geophysical modeling of a giant, complex impact structure:anatomy of the Vredefort structureTectonophysics, Vol. 287, No. 1-4, Mar. 20, pp. 1-20South AfricaStructure, Vredefort
DS1988-0327
1988
Henkel, J.Jaskolla, F., Henkel, J.Evaluation and digital processing of multispectral SPOT dataInternational Journal of Remote Sensing, Vol. 9, No. 10-11, Oct-Nov. pp. 1629-1638GlobalRemote Sensing, Computer -SPOT.
DS200712-0169
2007
Henkel, T.Chatzitheodoridis, E., Kostopoulos, D., Lyon, I., Henkel, T., Cornelius, N., Baltatzis, E., Reischmann, T.Elemental distributions in zircons from Diamondiferous UHPM rocks from the Greek Rhodope: a TOF-SIMS study.Plates, Plumes, and Paradigms, 1p. abstract p. A163.Europe, GreeceUHP
DS1859-0010
1744
Henkels, J.F.Henkels, J.F.Views on the Formation of Mineral Materials, Including Gemstones and Coral.Dressden And Leipzig:, 619P.GlobalKimberley
DS1995-1581
1995
Henley, R.Rix, S., Henley, R.Thinking discovery - is your mind trained for successful explorationAustralian Institute of Mining and Metallurgy (AusIMM) Bulletin, No. 1, Feb, pp. 76-80AustraliaEconomics, Exploration philosophy -brain power
DS1992-0703
1992
Henley, S.Henley, S., Aucott, J.W.Some alternatives to geostatistics for mining and explorationInstitute of Mining and Metallurgy (IMM)Transactions, Vol. 101, pp. A 36-A40GlobalGeostatistics, Soft-kriging
DS200612-0567
2006
Henley, S.Henley, S.The problem of missing dat a in geoscience dat abases.Computers & Geosciences, in pressTechnologyFuzzy logic
DS201312-0378
2013
Henn, S.Henn, S.Transnational entrepreneurs and the emergence of clusters in peripheral regions, The case of the diamond cutting cluster in Gujarat, India.European Planning Studies, Vol. 21, 11, pp. 1779-1795.IndiaDiamond cutting
DS1950-0027
1950
Hennessey, M.N.Hennessey, M.N.Diamond Mining by Gold Coast AfricansCrown Colonist., Vol. 20, No. 224, JULY PP. 422-423.West Africa, Gold Coast, BonsahGeology, Alluvial Diamond Placers
DS201803-0432
2018
Hennet, L.Andrault, D., Pesce, G., Manthilake, G., Monteux, J., Volfan-Casanova, N., Chantel, J. , Novella, D., Guignot, N., King, A., Itie, J-P., Hennet, L.An archean mushy mantle.Nature Geoscience, Vol. 11, 2, pp. 85-86.Mantlegeodynamics

Abstract: Experimental data reveal that Earth’s mantle melts more readily than previously thought, and may have remained mushy until two to three billion years ago.
DS1988-0578
1988
Henney, P.J.Rock, N.M.S., Gaskarth, J.W., Henney, P.J., Shand, P.Late Caledonian dyke swarms of northern Britain: some preliminary petrogeneic and tectonic implications of their province wide distribution andchemicCanadian Mineralogist, Vol. 26, No. 1, March pp. 3-22GlobalBlank
DS1996-0465
1996
Henney, P.J.Fowler, M.B., Henney, P.J.Mixed Caledonian appinite magmas: implications for lamprophyre fractionation and high BaSr granite genesisContributions to Mineralogy and Petrology, Vol. 126, pp. 199-215.ScotlandLamprophyres
DS2003-0577
2003
Henning, A.Henning, A., Kiviets, G., Kurszlaukis, S., Barton, E., Mayaga-Mikolo, F.Early Proterozoic metamorphosed kimberlites from Gabon8 Ikc Www.venuewest.com/8ikc/program.htm, Session 7, AbstractGabonKimberlite petrogenesis
DS200412-0818
2003
Henning, A.Henning, A., Kiviets, G., Kurszlaukis, S., Barton, E., Mayaga-Mikolo, F.Early Proterozoic metamorphosed kimberlites from Gabon.8 IKC Program, Session 7, AbstractAfrica, GabonKimberlite petrogenesis
DS201212-0339
2012
Henning, A.Jelsma, H.,Krishnan, S.U., Perritt, S.,Kumar, M., Preston, R., Winter, F., Lemotlo, L., Costa, J., Van der Linde, G., Facatino, M., Posser, A., Wallace, C., Henning, A., Joy, S., Chinn, I., Armstrong, R., Phillips, D.Kimberlites from central Angola: a case stidy of exploration findings.10th. International Kimberlite Conference Feb. 6-11, Bangalore India, AbstractAfrica, AngolaOverview of kimberlites
DS201412-0427
2013
Henning, A.Jelsma, H., Krishnan, U., Perritt, S., Preston, R., Winter, F., Lemotlo, L., van der Linde, G., Armstrong, R., Phillips, D., Joy, S., Costa, J., Facatino, M., Posser, A., Kumar, M., Wallace, C., Chinn, I., Henning, A.Kimberlites from central Angola: a case study of exploration findings.Proceedings of the 10th. International Kimberlite Conference, Vol. 2, pp. 173-190.Africa, AngolaExploration - kimberlites
DS201212-0294
2012
Henning, O.Henning, O.,Sorensen, S.S., Hakin, S., Pedersen, B.oC., Christiansen, Z.I.Non destructive identification of micrometer scale minerals and their position within a bulk sample.Canadian Mineralogist, Vol. 50, 2, pp. 501-509.TechnologyMicrotomography
DS1998-0613
1998
Henning, Th.Henning, Th., Salawa, F.Carbon in the universeScience, Vol. 282, No. 5397, Dec. 18, pp. 2204-10.MantleCarbon
DS2002-1726
2002
HennionWinkler, B., Knorr, Kahle, Vontobel, Lehmann, HennionNeutron imaging and neutron tomography as non-destructive tools to study bulk rock samples.European Journal of Mineralogy, Vol.14,2,pp.349-54.GlobalTechnology
DS2002-1727
2002
HennionWinkler, B., Knorr, Kahle, Vontobel, Lehmann, HennionNeutron imaging and neutron tomography as non-destructive tools to study bulk rock samples.European Journal of Mineralogy, Vol. 14,pp.349-54., Vol. 14,pp.349-54.GlobalTomography - neutron imaging - not specific to diamonds
DS2002-1728
2002
HennionWinkler, B., Knorr, Kahle, Vontobel, Lehmann, HennionNeutron imaging and neutron tomography as non-destructive tools to study bulk rock samples.European Journal of Mineralogy, Vol. 14,pp.349-54., Vol. 14,pp.349-54.GlobalTomography - neutron imaging - not specific to diamonds
DS201412-0010
2014
Henot, J-M.Andrault,D., Pesce, G., Ali Bouhifd, M., Bolfan-Casanova, N., Henot, J-M., Mezouar, M.Melting of basalt at the core-mantle boundary.Science, Vol. 344, no. 6186, pp. 892-895.MantleSubduction
DS1984-0389
1984
Henriksen, N.Kalsbeek, F., Taylor, P.N., Henriksen, N.Age of rocks, structures and metamorphism in the Nagssugtoqidian Mobile belt - fold and lead isotope evidence.Canadian Journal of Earth Sciences, Vol. 21, pp. 1126-31.Greenland, WesternGeochronology
DS1970-0530
1972
Henriques, R.C.Henriques, R.C.Crystallographic Studies of Kimberlite Minerals of Varying Chemical composition.Ph.d. Thesis University London., 325P.GlobalCrystallography, Mineralogy
DS1997-0113
1997
Henry, B.Borradaile, G.J., Henry, B.Tectonic applications of magnetic susceptibilty and its anisotropyEarth Science Reviews, Vol. 42, pp. 49-93GlobalMagnetic susceptibility - AMS, Tectonics
DS2001-0246
2001
Henry, B.Derder, M.E.M., Henry, B., Merabet, N., Amenna, BouroisUpper Carboniferous paleomagnetic pole from the stable Saharan Craton and Gondwana reconstructions.Journal of African Earth Science, Vol. 32, No. 3, Apr. pp. 491-502.South AfricaGeophysics - paleomagnetism, Gondwanaland
DS2002-0123
2002
Henry, B.Bayou, B., Derder, M.E., Henry, B., Djellit, H.,AmennaPremier pole paleomagnetique d'age Mosvien constraint par un test du pli, obtenu dans le bassin d'Illizi.Comptes Rendus Geosciences, Vol.334,2,pp. 81-7.AlgeriaCraton - Sahara, Paleomagnetism
DS1986-0358
1986
Henry, C.D.Henry, C.D., McDowell, F.W., Price, J.G., Smyth, R.C.Compilation of potassium argon ages of Tertiary igneous rocks,Trans PecosTexasTexas Bur. Econ. Geol, Geol. Circular, No. 86-2, 20pGlobalGeochronology
DS1986-0653
1986
Henry, C.D.Price, J.G., Henry, C.D., Parker, D.F., Barker, D.S.Igneous geology of Trans Pecos TexasTexas Bur. of Economic Geology, Guidebook, No. 23, 100pGlobalBlank
DS1987-0595
1987
Henry, C.D.Price, J.G., Henry, C.D., Barker, D.S., Parker, D.F.Alkalic rocks of contrasting tectonic settings in Trans Pecos TexasMantle metasomatism and alkaline magmatism, edited E. Mullen Morris and, No. 215, pp. 335-346GlobalAnalyses p. 340
DS1993-0736
1993
Henry, C.D.James, E.W., Henry, C.D.Southeastern extent of the North American craton in Texas and northern Chihuahua as revealed by lead isotopesGeological Society of America (GSA) Bulletin, Vol. 105, No. 1, January pp. 116-126Texas, MexicoCraton, tectonics
DS1993-1341
1993
Henry, C.D.Rubin, J.N., Henry, C.D., Price, J.G.The mobility of zirconium and other immobile elements during hydrothermalalterationChemical Geology, Vol. 110, No. 1/3, November 25, pp. 29-48GlobalAlteration -hydrothermal, Zircon
DS2003-1294
2003
Henry, C.D.Sloan, J., Henry, C.D., Hopkins, M., Ludington, S.National geochronological database. Original databse by Zartman, Bush and AbstonU.s.g.s. Open File, Http://geopubs.wr.usgs.gov/open-file/of3-236, United StatesGeochronology - database ( not specific to diamonds)
DS200412-1854
2003
Henry, C.D.Sloan, J., Henry, C.D., Hopkins, M., Ludington, S.National geochronological database. Original databse by Zartman, Bush and Abston.U.S. Geological Survey, United StatesGeochronology - database ( not specific to diamonds)
DS1994-0475
1994
Henry, D.Dutrow, B., Cash, T., Henry, D.Crystal chemistry of charoite: a product of intense metasomatic processesGeological Society of America (GSA) Abstract Volume, Vol. 26, No. 7, ABSTRACT only p. A481.RussiaCharoite, Little Murun alkaline
DS1950-0104
1952
Henry, D.J.Henry, D.J.Gem Trail JournalCalifornia: Long Beach, Second Edition., 93P.United States, California, West CoastBlank
DS201412-0601
2013
Henry, D.J.Mueller, P.A., Mogk, D.W., Henry, D.J., Wooden, J.L., Foster, D.A.The plume to plate transition: Hadean and Archean crustal evolution in the northern Wyoming province, USA.Dilek & Furnes eds. Evolution of Archean crust and early life. Springer Publication, pp. 23-54.United StatesMantle plume
DS1983-0218
1983
Henry, F.Eupene Exploration Enterprises, Geopeko Ltd., Henry, F.El 2885 Final Report on Exploration 1982-1983Northern Territory Geological Survey Open File Report, No. CR 83/269, 16P.Australia, Northern TerritoryProspecting, Sampling, Geochemistry
DS1990-0685
1990
Henry, G.Henry, G., Clendenin, C.W., Stainstreet, I.G., Maiden, K.J.Multiple detachment model for the early rifting stAge of Late Proterozoic Damara orogen in NamibiaGeology, Vol. 18, No. 1, January pp. 67-71Southwest Africa, NamibiaTectonics, Damara orogen
DS1991-1654
1991
Henry, G.Stanistreet, I.G., Kukla, P.A., Henry, G.Sedimentary basinal responses to a Late Precambrian Wilson Cycle: the Damara Orogen and Nama Foreland, NamibiaJournal of African Earth Sciences, Vol. 13, No. 1, pp. 141-156Namibia, Southwest AfricaOrogeny, Wilson Cycle
DS200712-1163
2006
Henry, G.Wilson, M.G.C., Henry, G.A review of the alluvial diamond industry and the gravels of the North West province, South Africa.South African Journal of Geology, Vol. 109, 3, Sept. pp. 301-314.Africa, South AfricaReview - Schweizer-Reneke, Lichtenburg, Ventersdorp
DS201709-1998
2017
Henry, H.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.
DS201906-1293
2019
Henry, H.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.
DS202008-1398
2020
Henry, H.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.
DS1996-1127
1996
Henry, J.J.Pollock, S.H., Henry, J.J.Mineral extraction and United Kingdom policies for sustainabledevelopmentMinerals Industry International, January pp. 13-16GlobalEconomics, Sustainability
DS1989-0624
1989
Henry, M.E.Henry, M.E.Review of the geology of the southern Oklahoma foldbelt province as abasis for estimates of undiscovered hydrocarbon resourcesUnited States Geological Survey (USGS) Open File, No. 87-045, 21p. $ 3.25GlobalTectonics
DS1993-0895
1993
Henry, P.Le Pichon, X., Henry, P., Lallemant, S.Accretion and erosion in subduction zones: the role of fluidsAnnual Review of Earth and Planetary Sciences, Vol. 21, pp. 307-332MantleTectonics
DS1996-1373
1996
Henry, P.Stevenson, R., Henry, P., Gariepy, C.Micro-continents and cratons: crustal evolution in the western SuperiorProvince.Geological Association of Canada (GAC) Annual Abstracts, Vol. 21, abstract only p.A91.OntarioCraton, Crustal evolution
DS1998-0614
1998
Henry, P.Henry, P., Stevenson, R.K., Gariepy, C.Late Archean mantle composition and crustal growth in the Western Superior Province of Canada: Neodynium and lead ...Geochimica et Cosmochimica Acta, Vol. 62, No. 1, pp. 143-157OntarioGeochronology, Wawa, Wabigoon subprovinces
DS1998-1411
1998
Henry, P.Stevenson, R., Henry, P., Gariepy, C.Late Archean cratonic evolutionGeological Association of Canada (GAC)/Mineralogical Association of Canada (MAC) Abstract Volume, p. A180. abstract.Ontario, ManitobaSuperior Province, Craton
DS1998-1470
1998
Henry, P.Tomlinson, K.Y., Stevenson, R.K., Henry, P.The Red Lake GS: evidence of plume related magmatism at 3 Ga and evidence of an older enriched sourcePrecambrian Research, Vol. 89, No. 1-2, May pp. 59-76Ontario, Superior ProvinceGreenstone Belt, Plumes, magmas
DS1999-0714
1999
Henry, P.Stevenson, R.K., Henry, P., et al.Archean crustal growth and tectonics in the western Superior ProvinceGeological Association of Canada (GAC) Geological Association of Canada (GAC)/Mineralogical Association of Canada (MAC)., Vol. 24, p. 122. abstractOntarioTectonics, Superior Craton
DS2000-0405
2000
Henry, P.Henry, P., Stevenson, R.K., Gariepy, C.neodymium isotopic evidence for Early to late Archean (3.4-2.7 Ga) crustal grow thin Western Superior Province OntarioTectonophysics, Vol.322, No.1-2, July10, pp.135-52.OntarioGeochronology, Superior Province
DS2000-0406
2000
Henry, P.Henry, P., Stevenson, R.K., Larbi, Y., Gariepy, C.neodymium isotopic evidence for Early to Late Archean (3.4-2.7Ga) crustal growth in Western Superior ProvinceTectonophysics, Vol. 322, No. 1-2, pp.135-51.OntarioGeochronology, Tectonics
DS2001-0264
2001
Henry, P.Doin, M.P., Henry, P.Subduction initiation and continental crust recycling: the roles of rheology and eclogitization.Tectonophysics, Vol. 342, No. 2, pp. 163-91.MantleEclogites, Subduction
DS2001-0472
2001
Henry Birks and Sons Inc.Henry Birks and Sons Inc.Birks leads the way with Canadian mined diamond jewellery ProgramBirks and Sons Jewellers, Jan. 8, 2p.CanadaNews item, Diamond - sales
DS1994-1917
1994
Hensel, H.D.Wilkinson, J.F.G., Hensel, H.D.Nephelines and analcines in some alkaline igneous rocksContributions to Mineralogy and Petrology, Vol. 118, No. 1, Oct. pp. 79-91.AustraliaAlkaline rocks
DS1990-1070
1990
Hensen, B.J.Motoyoshi, Y., Hensen, B.J.Metastable growth of corundum adjacent to quartz in aspinel-bearingquartzite from the Archaean NapierComplex, AntarcticaJournal of Metamorphic Geology, Vol. 8, pp. 125-130AntarcticaNapier Complex
DS2000-0159
2000
Hensen, B.J.Clark, D.J., Hensen, B.J., Kinny, P.D.Geochronological constraints for a two stage history of the Albany Fraser Orogen, Western Australia.Precambrian Research, Vol. 102, No. 3-4, Aug.pp. 155-83.Australia, Western AustraliaGeochronology, Orogeny
DS2002-0237
2002
Hensen, B.J.Camacho, A., Hensen, B.J., Armstrong, R.Isotopic test of a thermally driven intraplate orogenic model, AustraliaGeology, Vol. 30, 10, Oct. pp. 887-90.AustraliaOrogenesis, basins, geothermometry
DS1950-0217
1955
Henshaw, D.E.Henshaw, D.E.The Structure of WadeiteMineralogical Magazine., Vol. 30, PP. 585-595.AustraliaLeucite, Lamproite
DS1950-0355
1957
Hensley, F.S.JRShoemaker, E.M., Hensley, F.S.JR, Hallagan, R.W.Diatremes on the Navajo and Hopi Reservation, Arizona. #2United States Geological Survey (USGS) SPECIAL Publishing, No. TEI-690, PP. 389-398.United States, Arizona, Colorado Plateau, Rocky MountainsDiatreme
DS1991-1546
1991
Henson, H.Sexton, J., Henson, H.Lake Superior bedrock topography and rift structuresGeological Society of America Annual Meeting Abstract Volume, Vol. 23, No. 5, San Diego, p. A 138OntarioTectonics, Rifting
DS1994-1570
1994
Henson, H.Jr.Sexton, J.L., Henson, H.Jr.Interpretation of seismic reflection and gravity profile dat a in western Lake Superior.Canadian Journal of Earth Sciences, Vol. 31, No. 4, April pp. 652-660.Ontario, MichiganGeophysics -seismics, gravity, Tectonics -Midcontinent rift
DS1940-0007
1940
Henson, P.Henson, P.Arkansaw Diamond FieldGems And Gemology, Vol. 3, No. 7, PP. 109-112.United States, Gulf Coast, Arkansas, PennsylvaniaDiamond Occurrence, Geology
DS200512-0350
2004
Henson, P.Goleby, B.R., Blewett, R.S., Korsch, R.J., Champion, D.C., Cassidy, K.F., Jones, L.E., Groenewald, P.B., Henson, P.Deep seismic reflection profiling in the Archean northeastern Yilgarn Craton: implications for crustal architecture and mineral potential.Tectonophysics, Vol. 388, 1-4, pp. 119-133.AustraliaGeophysics - seismics, not specific to diamonds
DS2002-0596
2002
HenstockGorman, D., Clowes, Ellis, Henstock, Spence, KellerDeep probe: imaging the roots of western North AmericaCanadian Journal of Earth Science, Vol.39,3,Mar.pp.375-98., Vol.39,3,Mar.pp.375-98.Alberta, Montana, Colorado, CordilleraGeophysics - seismics, Tectonics
DS2002-0597
2002
HenstockGorman, D., Clowes, Ellis, Henstock, Spence, KellerDeep probe: imaging the roots of western North AmericaCanadian Journal of Earth Science, Vol.39,3,Mar.pp.375-98., Vol.39,3,Mar.pp.375-98.Alberta, Montana, Colorado, CordilleraGeophysics - seismics, Tectonics
DS1993-0654
1993
Henstock, T.J.Henstock, T.J., Woods, A.W., White, R.S.The accretion of oceanic crust by episodic sill intrusionJournal of Geophysical Research, Vol. 98, No. B 3, March 10, pp. 4143-4161MantleCrust, Seismic refraction data
DS1997-0650
1997
Henstock, T.J.Larkin, S.P., Levander, A. , Henstock, T.J.Is the MOHO flat? Seismic evidence for a rough crust-mantle interface beneath the north Basin -RangeGeology, Vol. 25, No. 5, May pp. 451-454United States, Basin and RangeGeophysics - seismics, Crust - mantle
DS1998-0865
1998
Henstock, T.J.Levander, A., Henstock, T.J., Snelson, C.M., KellerThe Deep Probe experiment; what is the role of inherited structure in the continents?Geological Society AmericanAnn.Meet., Vol. 30, No. 7, p. 161. abstract.Alberta, Western CanadaLithoprobe
DS1998-0866
1998
Henstock, T.J.Levander, A., Henstock, T.J., Snelson, Keller, GormanThe deep probe experiment: what is the role of inherited structure in thecontinents?Geological Society of America (GSA) Annual Meeting, abstract. only, p.A161.Northwest TerritoriesTectonics, Lithoprobe
DS1998-1364
1998
Henstock, T.J.Snelson, C.M., Henstock, T.J., Keller, Miller, LevanderCrustal and uppermost mantle structure along the Deep Probe seismic profileRocky Mountain Geol., Vol. 33, No. 2, pp. 181-98.Alberta, Western CanadaGeophysics - seismics, Lithoprobe
DS2002-1021
2002
HentonMazzotti, S., Dragert, Hyndman, Miller, HentonGPS deformation in a region of high crustal seismicity: N. Cascadia forearcEarth and Planetary Science Letters, Vol.198,1-2,pp.41-8., Vol.198,1-2,pp.41-8.CordilleraGeophysics - seismics not specific to diamonds
DS2002-1022
2002
HentonMazzotti, S., Dragert, Hyndman, Miller, HentonGPS deformation in a region of high crustal seismicity: N. Cascadia forearcEarth and Planetary Science Letters, Vol.198,1-2,pp.41-8., Vol.198,1-2,pp.41-8.CordilleraGeophysics - seismics not specific to diamonds
DS1991-1382
1991
Hentschel, T.Priester, M., Hentschel, T.Technology and problems of small scale mining in South AmericaRaw Materials Alert, Vol. 8, No. 1, pp. 40-49Bolivia, ColumbiaMining -general, Economics
DS1995-0788
1995
Hepton, P.Hepton, P.Deep rotary cored boreholes in soils using wireline drillingGeoDrilling International, Vol. 3, No. 2, April pp. 5, 7, 9.GlobalDrilling, Alluvials -not specific to diamonds
DS1970-0531
1972
Hepworth, J.V.Hepworth, J.V.Can Mineral Grains Be Used to Recognize the Basement in Thekalahari?Botswana Geological Survey, JVH/1/72, 3P. (UNPUBL.)BotswanaProspecting, Geochemistry
DS1970-0714
1973
Hepworth, J.V.Hepworth, J.V.Report on a Visit to Orapa Mine, February 1973Botswana Geological Survey, JVH/5/73, 7P. (UNPUBL.)BotswanaProspecting, Mining Engineering
DS1975-0237
1976
Hepworth, J.V.Baldock, J.W., Hepworth, J.V., Marenga, B.S.I.Gold, Base Metals and Diamonds in BotswanaEconomic Geology, Vol. 71, No. 1, PP. 139-152;BotswanaKimberlite, Orapa
DS1975-0455
1977
Hepworth, J.V.Baldock, J.W., Hepworth, J.V., Marengwa, B.S.I.Resource Inventory of BotswanaBotswana Geological Survey, Vol. 4, 69P. PP. 49-57. (DIAMONDS).BotswanaKimberlite, Diamond Prospecting
DS201112-0431
2011
Hera, R.Hera, R.Understanding resource company lifecycles. Here are the basics.Resource World Magazine, August pp. 48-49.GlobalNews item - research
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Herail, G.Domergue, C., Fontan, F., Herail, G.Les techniques artisanales d'exploitation des gites alluviaux: analogies dans le temps et dans l'espaceChron. Rech. Min., (in French), No. 497, pp. 131-138GlobalPlacers, Mining technology -alluvials
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Herail, G.Domergue, C., Fontan, F., Herail, G.Les techiques artisanales d'exploitation des gitesalluviaux: analogies dans le temps et dans l'espace. (in French)Chron. Rech. Min., (in French), No. 497, pp. 131-138GlobalAlluvials, Placer mining
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Herail, G.Herail, G., Oller, J., Soler, P.Strike slip faulting, thrusting and related basins in the Cenozoic evolution of the southern branch OroclineTectonophysics, Vol. 259, No. 1-3, June 30, pp. 201-212BoliviaTectonics, Faulting, thrusting
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Herail, G.Baby, P., Rochat, P., Mascle, G., Herail, G.Neogene shortening contribution to crustal thickening in the back arc Of the Central AndesGeology, Vol. 25, No. 10, Oct., pp. 883-886Bolivia, AndesThrust systems, Tectonics, geophysics
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Herail, G.Jaillard, E., Herail, G., Monfret, T., Worner, G.Andean geodynamics: main issues and contr