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SDLRC - Scientific Articles all years by Author - E


The Sheahan Diamond Literature Reference Compilation
The Sheahan Diamond Literature Reference Compilation is compiled by Patricia Sheahan who publishes on a monthly basis a list of new scientific articles related to diamonds as well as media coverage and corporate announcementscalled the Sheahan Diamond Literature Service that is distributed as a free pdf to a list of followers. Pat has kindly agreed to allow her work to be made available as an online digital resource at Kaiser Research Online so that a broader community interested in diamonds and related geology can benefit. The references are for personal use information purposes only; when available a link is provided to an online location where the full article can be accessed or purchased directly. Reproduction of this compilation in part or in whole without permission from the Sheahan Diamond Literature Service is strictly prohibited. Return to Diamond Resource Center
Sheahan Diamond Literature Reference Compilation - Scientific Articles by Author for all years
A-An Ao+ B-Bd Be-Bk Bl-Bq Br+ C-Cg Ch-Ck Cl+ D-Dd De-Dn Do+ E F-Fn Fo+ G-Gh Gi-Gq Gr+ H-Hd He-Hn Ho+ I J K-Kg Kh-Kn Ko-Kq Kr+ L-Lh
Li+ M-Maq Mar-Mc Md-Mn Mo+ N O P-Pd Pe-Pn Po+ Q R-Rh Ri-Rn Ro+ S-Sd Se-Sh Si-Sm Sn-Ss St+ T-Th Ti+ U V W-Wg Wh+ X Y Z
Sheahan Diamond Literature Reference Compilation - Media/Corporate References by Name for all years
A B C D-Diam Diamonds Diamr+ E F G H I J K L M N O P Q R S T U V W X Y Z
Tips for Users
Posted/Published Reference CodesThe SDLRC provides 3 types of references identified in the reference code. DS for scientific article, DM for a media article, and DC for a corporate announcement. Consider DS0512-0001. The DS stands for "diamond scientific". 05 stands for 2005, the year the reference was posted. 12 represents the month the reference was posted. For all years prior to 2015 the default month is 12. -0001 is the reference's identifier and it does not mean anything. The number below the refence code, ie 2015, is the year the article was published. Note that the posted year may sometimes be later than the published year.
Sort OrderReferences are sorted by the "author" name and when the reference was posted to the compilation.
Most RecentIf the reference code is highlighted yellow, the reference was made available through the most recent monthly compilation of new literature. Use this to check out new references. When new references are posted, we make it our priority to track down an online link and obtain an abstract. With regard to older references, tracking down an abstract and an online link is a work in progress.
Link to external location of article: If the title has a link, it means we have found a location online where you can either retrieve the full article free, or purchase access to it. The Sheahan Diamond Literature Service is not a technical article procurement service; if you want a restricted article, you must deal directly with the vendor who controls the copyright to the article.
Searching this page for a specific term or authorIn your Firefox browser click Edit in the menu bar and then Find. In the Find box that shows up at the bottom of the web page enter your search term. Firefox will highlight all occurrences. This is particularly helpful when the author you are seeking was not the lead author by whom the compilation is sorted.
Sending or sharing a referenceThe left column (Posted/Published) has an embedded hyperlink for each reference. In Firefox, if you right click on it, you can obtain the link url for that reference's location within the page, which you can copy and paste into an email or any other document. You can also use the "share this link" option to tweet, facebook etc the link.
Author Index
A-An Ao+ B-Bd Be-Bk Bl-Bq Br+ C-Cg Ch-Ck Cl+ D-Dd De-Dn Do+ E F-Fn Fo+ G-Gh Gi-Gq Gr+ H-Hd He-Hn Ho+ I J K-Kg Kh-Kn Ko-Kq Kr+ L-Lh
Li+ M-Maq Mar-Mc Md-Mn Mo+ N O P-Pd Pe-Pn Po+ Q R-Rh Ri-Rn Ro+ S-Sd Se-Sh Si-Sm Sn-Ss St+ T-Th Ti+ U V W-Wg Wh+ X Y Z
Sheahan Diamond Literature Reference Compilation - Scientific Articles by Author for all years - E
Posted/
Published
AuthorTitleSourceRegionKeywords
DS201112-0294
2011
E&MJE&MJSouth Africa: Africa's superpower. Overview of all minerals ( 1/2 p on diamonds).E & MJ, June pp. 82-85.Africa, South AfricaNews item - history
DS202003-0330
2019
E.V.Badukhinov, L.D., Spetius, Z.V.. Kislov, E.V., Ivanov, A.S., Monkhorov, R.V.Parageneses of garnet inclusions in diamonds from Yakutia kimberlites based on Raman and IR spectroscopy data. Udachnaya, Zapolyarnaya, Komolskaya, Yuibeyana, Aikhal, Mir, Mayskaya.Geology of Ore Deposits, Vol. 61, 7, pp. 606-612. pdfRussia, Yakutiadiamond inclusions
DS201904-0753
2019
E.W.F.Kroonenberg, S., Mason, P.R.D., Kriegsman, L. de Roever, E.W.F., Wong, T.E.Geology and mineral deposits of the Guiana Shield.SAXI-XI Inter Guiana Geological Conferene 2019: Paramaribo, Suriname, 6p. PdfSouth America, Brazil, VenezuelaGuiana shield

Abstract: The Guiana Shield records a long history that starts in the Archean, but culminates in the Trans-Amazonian Orogeny between 2.26-2.09 Ga as a result of an Amazonian-West-Africa collision. This event is responsible for the emplacement of a major part of its mineralisations, especially gold, iron and manganese. The diamondiferous Roraima Supergroup represents its molasse. Between 1.86 and 1.72 Ga the Rio Negro Block accreted in the west. The Grenvillian Orogeny caused shearing and mineral resetting between 1.3 and 1.1 Ga when Amazonia collided with Laurentia. Younger platform covers contain placer gold mineralisation. Several suits of dolerite dykes record short-lived periods of crustal extension. Bauxite plateaus cover various rock units.
DS1960-0656
1966
Eade, K.E.Eade, K.E.Fort George River and Caniapiscau River Map Area, New QuebecGeological Survey of Canada (GSC) Memoir, No. 339, 84p.Quebec, Ungava, LabradorGeology
DS1860-0548
1887
Eady, W.T.Eady, W.T.I.d.b. or the Adventures of Solomon Davis on the Diamond Fields and Elsewhere.London: Chapman And Hall, 344P.Africa, South AfricaTravelogue
DS1992-0406
1992
Eager, M.A.Eager, M.A.Keynote address to underground operators conference: an economic overview with productivity, safety, mining costsAustralian Institute of Mining and Metallurgy (AusIMM) Bulletin, No. 6, October pp. 29-33AustraliaMining, Underground mining -history and future
DS200812-0307
2008
Eagles, G.Eagles, G., Konig, M.A model of plate kinematics in Gondwana breakup.Geophysical Journal International, Vol. 173, 2, pp. 703-717.MantleTectonics
DS201810-2385
2018
Eagles, G.Tuck-Martin, A., Adam, J., Eagles, G.New plate kinematic model and tectono-stratigraphic history of the East African and West Madagascar margins.Basin Research, doi:10.1111/bre.12294 23p.Africa, Madagascartectonics

Abstract: The continental margins of East Africa and West Madagascar are a frontier for hydrocarbon exploration. However, the links between the regional tectonic history of sedimentary basins and margin evolution are relatively poorly understood. We use a plate kinematic model built by joint inversion of seafloor spreading data as a starting point to analyse the evolution of conjugate margin segments and corresponding sedimentary basins. By correlating megasequences in the basins to the plate model we produce a margin-scale tectono-stratigraphic framework comprising four phases of tectonic development. During Phase 1 (183-133 Ma) Madagascar/India/Antarctica separated from Africa, first by rifting and later, after breakup (at ca. 170-165 Ma), by seafloor spreading in the West Somali and Mozambique basins and dextral strike-slip movement on the Davie Fracture Zone. Mixed continental/marine syn-rift megasequences were deposited in rift basins followed by shallow-marine early postrift sequences. In Phase 2 (133-89 Ma) spreading ceased in the West Somali basin and Madagascar became fixed to the African plate. However, spreading continued between the African and Antarctic plates and deposition of the early postrift megasequence continued. The onset of spreading on the Mascarene Ridge separated India from Madagascar in Phase 3 (89-60 Ma). Phase 3 was characterized by the onset of deposition of the late postrift megasequence with continued deep marine sedimentation. At the onset of Phase 4 (60 Ma onward) spreading on the Mascarene ridge ceased and the Carlsberg Ridge propagated south to form the Central Indian Ridge, separating India from the Seychelles and the Mascarene Plateau. Late postrift deposition continued until a major unconformity linked to the development of the East African Rift System marked the change to deposition of the modern margin megasequence.
DS1993-0193
1993
Eagleson, R.Butt, P., Eagleson, R.MABO: what the High Court saidFederation Press, AustraliaBook -review, Legal -native
DS1986-0203
1986
Eahy, S.Eahy, S., Louie, S.G., Cohen, M.L.Pseudopotential total energy study of the transition from rhombohedral graphite to diamondPhys. Rev. B., Vol. 34, No. 2, July 15, pp. 1191-1199GlobalDiamond morphology
DS201601-0015
2015
Eakin, C.M.Eakin, C.M., Long, M.D., Scire, A., Beck, S.L., Wagner, L.S., Zandt, G., Tavera, H.Internal deformation of the subducted Nazca slab inferred from seismic anisotropy. ..new study suggests that the Earth's rigid tectonic plates stay strong when they slide under another plate, known as subduction, may not be universal.Nature Geoscience, 10.1038/ngeo2592MantleSubduction
DS201911-2517
2019
Eakin, C.M.Davies, D.R., Valentine, A.P., Kramer, S.C., Rawlinson, N., Hoggard, M.J., Eakin, C.M., Wilson, C.R.Earth's multi-scale topographic response to global mantle flow.Nature Geosciences, Vol. 12, pp. 845-850.Mantlegeodynamics

Abstract: Earth’s surface topography is a direct physical expression of our planet’s dynamics. Most is isostatic, controlled by thickness and density variations within the crust and lithosphere, but a substantial proportion arises from forces exerted by underlying mantle convection. This dynamic topography directly connects the evolution of surface environments to Earth’s deep interior, but predictions from mantle flow simulations are often inconsistent with inferences from the geological record, with little consensus about its spatial pattern, wavelength and amplitude. Here, we demonstrate that previous comparisons between predictive models and observational constraints have been biased by subjective choices. Using measurements of residual topography beneath the oceans, and a hierarchical Bayesian approach to performing spherical harmonic analyses, we generate a robust estimate of Earth’s oceanic residual topography power spectrum. This indicates water-loaded power of 0.5?±?0.35?km2 and peak amplitudes of up to ~0.8?±?0.1?km at long wavelengths (~104?km), decreasing by roughly one order of magnitude at shorter wavelengths (~103?km). We show that geodynamical simulations can be reconciled with observational constraints only if they incorporate lithospheric structure and its impact on mantle flow. This demonstrates that both deep (long-wavelength) and shallow (shorter-wavelength) processes are crucial, and implies that dynamic topography is intimately connected to the structure and evolution of Earth’s lithosphere.
DS1985-0163
1985
Eakins, G.R.Eakins, G.R., Bundtzen, T.K., et al.Crooked Creek Diamond DiscoveryAlaska's Mineral Industry 1984, Special Report, No. 38, pp.10-11AlaskaDiamond Occurrences
DS1860-0799
1893
Eakle, A.S.Eakle, A.S.On Some Dikes Occurring Near Lyon Mountains, Clinton County, New York.American Geologist., Vol. 12, PP. 31-36.United States, New YorkGeology
DS1910-0410
1914
Eakle, A.S.Eakle, A.S.Minerals of California (1914)California Mining Bureau Bulletin., No. 67, 226P.United States, California, West CoastBlank
DS1920-0152
1923
Eakle, A.S.Eakle, A.S.Minerals of Californiaá(1923)California State Mining Bureau Report Bulletin., No. 91, 328P.United States, California, West Coast, Nevada, Siskiyou, Trinity, FresnoBlank
DS1975-1001
1979
Eales, E.V.Eales, E.V., Snowden, D.V.Chromiferous Spinels of the Elephant's Head DikeMineralium Deposita., Vol. 14, No. 2, PP. 227-242.Tanzania, East AfricaRelated Rocks
DS1983-0208
1983
Eales, H.V.Eales, H.V., Reynolds, I.M.Factors Influencing the Composition of Chromite and Magnetite in Some Southern African Rocks.Icam 81 Geological Society of South Africa Spec. Publishing, No. 7, PP. 5-20.South AfricaGeochemistry, Mineralogy
DS1994-1088
1994
Eales, H.V.Maier, W.D., Eales, H.V.Plagioclase inclusions in orthopyroxene and olivine of the UG2 Merensky Reef interval: regional trends.South Africa Journal of Geology, Vol. 97, No. 4, pp. 408-414South AfricaInclusions -texture, Deposit -Bushveld Complex
DS2002-0412
2002
Eales, H.V.Eales, H.V.Caveats in defining the magmas parental to the mafic rocks of the Bushveld Complex, and the manner of their emplacement: review and commentary.Mineralogical Magazine, Vol.66, 6, pp. 815-32.South AfricaMagma - not specific to diamonds
DS1989-1678
1989
E-AnZen, E-AnPlumbing the depth of batholithsAmerican Journal of Science, Vol. 289, No. 10, December pp. 1137-1157GlobalBatholiths, Genesis
DS1995-2125
1995
E-AnZen, E-AnCrustal magma generation and low pressure high temp regional metamorphism in extensional environ Lachlan B.American Journal of Science, Vol. 295, Summer pp. 851-874AustraliaThermal modelling, Lachlan Belt
DS1859-0056
1837
Earl, G.W.Earl, G.W.Sketch of the Island of BorneoAsiatic Soc. Bengal Journal, Vol. 4, PP. 174-186.Southeast Asia, BorneoGeology
DS1859-0057
1837
Earl, G.W.Earl, G.W.The Eastern Seas; or Voyages and Adventures in the Indian Archipelago, in 1832-33-34, Comprising a Tour of the Island of Java- Visits to Borneo, the malay Peninsula, Siam....Londonl W.h. Allen And Co., 461P.Southeast Asia, Borneo, Java, MalaysiaTravelogue
DS1983-0209
1983
Earl, P.I.Earl, P.I.Tonopah's Great Diamond RushCalif. Min. Journal, Vol. 52, No. 5, PP. 36-37.GlobalHistory
DS1997-0303
1997
Earle, P.R.Earle, P.R., Shearer, P.M.Observations of PKKP precursors used to estimate small scale topography on the core mantle boundary.Science, Vol. 277, No. 5326, Aug. 1, pp. 667-669.MantleCore-mantle boundary
DS2001-1202
2001
Earle, P.S.Vidale, J.E., SAchubert, G., Earle, P.S.Unsuccessful initial search for a midmantle chemical boundary with seismicarrays.Geophysical Research Letters, Vol. 28, No. 5, Mar. 1, pp. 859-62.MantleGeophysics - gravity, Geochemistry
DS2003-1509
2003
Earle, P.S.Xu, F., Vidale, J.E., Earle, P.S.Survey of precursors to P'P': fine structure of mantle discontinuitiesJournal of Geophysical Research, Vol. 08, 2, 10.1029/2001JB000817.MantleGeophysics - seismics, Discontinuity
DS200412-2158
2003
Earle, P.S.Xu, F., Vidale, J.E., Earle, P.S.Survey of precursors to P'P': fine structure of mantle discontinuities.Journal of Geophysical Research, Vol. 08, 2, 10.1029/2001 JB000817.MantleGeophysics - seismics Discontinuity
DS1991-0177
1991
Earley, D.IIIBrink, S., Saini-Eidukat, B., Earley, D.III, Blake, R.Application of petrographic techniques to assess in situ leaching miningpotentialUnited States Bureau of Mines I.C., No. IC 9295, 14pUnited StatesMining -in-situ, Petrography
DS1970-0285
1971
Early, T.O.Early, T.O.Rare Earths in the Eclogite Inclusions from the Roberts Victor Kimberlite, South Africa.Ph.d. Thesis, Washington University St. Louis, Missouri, South AfricaRare Earth Elements (ree), Geochemistry
DS1993-0386
1993
Earnshow, R.A.Earnshow, R.A., Gigante, M.A., Jones, H.Virtual reality systemsAcademic Press, 327p. approx. $ 50.00GlobalBook -ad, Virtual reality systems
DS1995-0469
1995
EarthEarthDiamond surprise..... microscopic green diamonds..Earth, December p. 11.NorwayMicroscopic diamonds
DS201412-0217
2014
Earth Chem NewsEarth Chem NewsDatasets available to download - mentions xenoliths ( not specific to diamonds)Earthchem.org, listingTechnologyDatasets - xenoliths
DS201701-0009
2016
Earth ExplorerEarth ExplorerMagnetic inversion results for Ngami land availabe for download.http://geoscienceportal.geosoft.com/Botswana/search, Dec. 22, 1p. OverviewAfrica, BotswanaGeophysics - Geosoft

Abstract: A regional-scale geophysical inversion of magnetic field data in the Ngamiland region of northwestern Botswana is now available for download from the Botswana Geoscience Portal, a partnership initiative of the Botswana Geoscience Institute (BGI), industry sponsors and Geosoft. The earth modelling results represent Botswana’s latest push to provide geoscience data free of charge to mineral explorers, researchers and other stakeholders from around the world. They were generated by the Geosoft Professional Services Group using VOXI Earth Modelling, the company’s high performance inversion software. "The VOXI inversion results are outstanding, even more so because the area of interest is vast, comprising more than 35 million cells," said Motsamai Tarzan Kwadiba, Principal Geophysicist for the BGI. "The outcome provides a springboard for a variety of research opportunities such as seismotectonic studies for seismic hazard assessment and earthquake risk mitigation, area selection for earth resources exploration and management, and investigations of the anatomy and evolution of the Okavango rift zone." Since its launch in April 2016, over 1000 multi-disciplinary datasets have been downloaded from the Botswana Geoscience Portal. Stakeholders from more than 35 countries have visited the repository to access the 10 gigabytes of pre-competitive geoscience data. The new inversion results add clear 3D images of the shallow crust beneath the Okavango delta region, one of the world’s largest inland deltas. Often referred to as the ‘jewel’ of the Kalahari and Africa's last Eden, the 22000 square-kilometer Okavango delta itself is an alluvial fan contained within a seismically active graben structure at the south-western extremity of the East African Rift system.
DS201412-0218
2014
Earth NewsEarth NewsEarth sized diamond in space is coolest white dwarf star.Earth News, June 25, 2p.SpaceStar
DS1995-0470
1995
Earth Observation MagazineEarth Observation MagazineA few questions and answers about GPS receiversEarth Observation Magazine, October pp. 54-55GlobalGPS
DS1996-0401
1996
Earth Observation MagazineEarth Observation MagazineGPS Q and A.. what is a datum?How can I map place/object that isinaccessible... brief answersEom., March pp. 38-39GlobalComputers, GIS
DS1997-0304
1997
Earth Observation MagazineEarth Observation MagazineMap accuracy specifications... pt. 1 of 2Eom., October pp. 33-36GlobalMaps, GIS
DS1993-0387
1993
Earth -overviewEarth -overviewSources of information for everyone to use and defend miningCalifornia Mining Journal, September issue, 4pUnited States, CanadaStatistics, Mining operations
DS1981-0145
1981
Earth Science ReviewsEarth Science ReviewsThe Geology of BrasilSpecial Issue, Vol. 17, No. 1-3, pp. 1-230BrazilStructure, Archean, Mantle, Resources, Book - Table Of Contents
DS201312-0235
2013
Earth Sky NewsEarth Sky NewsHow the Earth formed. Based on Stanford scientist report.Earth Sky News, Oct. 14, 3p.Core, mantle
DS201312-0236
2013
Earth Sky NewsEarth Sky NewsGiant fragment of Chelyabinsk meteorite lifted from Russian Lake. ( also on CNN video)Earth Sky News, Oct. 17, 1/2p.RussiaMeteorite
DS200412-0496
2003
Earth Star Diamonds Ltd.Earth Star Diamonds Ltd.Jubilee exploration results - update. Coronation district.Earth Star Diamonds ltd., April 30, 1p.Canada, NunavutNews item - press release Stornoway, Northern Empire, Wind River Resources
DS1982-0182
1982
Eash, D.M.Eash, D.M.International Gemological Symposium : Proceedings 1982Gemological Institute of America, Santa Monica, CA, 568P.GlobalDiamonds, Genesis, Sources, Synthetics, Coloured Stones, Production
DS200812-0917
2007
Eassaifi, A.Precigout, J., Gueydan, F., Gapais, D., Garrido, C.J., Eassaifi, A.Strain localization in the subcontinental mantle ?? a ductile alternative to the brittle mantle.Tectonophysics, Vol. 445, 3-4, pp. 318-336.MantleSubduction
DS1997-0305
1997
East, J.East, J., Lambert, I., Wood, P., Veitch, S.Recent trends in access to Australian mineral resourcesAustralian Institute of Mining and Metallurgy (AusIMM) Bulletin, No. 4, June pp. 84-88AustraliaBrief overview, Resources, discoveries, economics
DS1992-1119
1992
Easterfield, M.Newell, R.G., Theriault, D., Easterfield, M.Temporal GIS -modelling the evolution of spatial dat a in timeComputers and Geosciences, Vol. 18, No. 4, pp. 427-433GlobalComputer, Program -Geographic information systems, temporal
DS1998-0863
1998
Eastoe, C.J.Letendre, J., McCandless, T.E., Eastoe, C.J.Morphology and carbon isotope composition of microdiamonds from Dachine, French Guiana.7th International Kimberlite Conference Abstract, pp. 500-2.French GuianaDiamond morphology, resorption, Deposit - Dachine
DS1999-0453
1999
Eastoe, C.J.McCandless, T.E., Letendre, J., Eastoe, C.J.Morphology and carbon isotope composition of microdiamonds from Dachine, French Guiana.7th International Kimberlite Conference Nixon, Vol. 2, pp. 550-56.French GuianaMicro diamonds, diamond morphology, eclogite, Deposit - Dachine
DS201512-1943
1999
Eastoe, C.J.McCandless, T.E., Letendre, J., Eastoe, C.J.The morphology and carbon isotope chemistry of microdiamonds from the Dachine Diamondiferous body, French Guiana.Proceedings of rhe 7th International Kimberlite Conference, Vol. 2, pp. 550-556.South America, French GuianaMicrodiamonds
DS1996-0402
1996
Easton, D.W.Easton, D.W., Cassiy, J.F.A relic Proterozoic subduction zone in western Canada: new evidence from seismic reflection and receivers dataGeophysical Research Letters, Vol. 23, No. 25, Dec. 15, pp. 3791-94.Saskatchewan, AlbertaGeophysics -seismics
DS200412-0497
2004
Easton, R.G.Easton, R.G., Berman, J.Tectonometamorphic map of Ontario.Geological Survey of Canada Open File, No. 1810, 1: 1,500,000 $ 19.50Canada, OntarioMap - metamorphism
DS1989-0385
1989
Easton, R.M.Easton, R.M.Report on the Conference: Continental Magmatism held June 25-July 1, 1989in Santa Fe, New MexicoGeoscience Canada, Vol. 16, No. 4, December pp. 243-245GlobalConference report, Continental magmatism
DS1994-0477
1994
Easton, R.M.Easton, R.M., Carter, T.R.Basement geology and the Precambrian Paleozoic unconformity in southernOntarioGeological Association of Canada (GAC) Guidebook, No. B1, May 65pOntarioPrecambrian, Guidebook
DS1994-0478
1994
Easton, R.M.Easton, R.M., Davidson, A.Terrane boundaries and lithotectonic assemblages within the GrenvilleProvince, eastern OntarioGeological Association of Canada (GAC)/Mineralogical Association of Canada (MAC) Annual Meeting Guidebook, No. A1, 85p. $ 20.00OntarioBook -table of contents, Terranes, lithotectonic stratigraphy, Grenville
DS1994-1903
1994
Easton, R.M.White, D.J., Easton, R.M., et al.Seismic images of the Grenville Orogen in OntarioCanadian Journal of Earth Sciences, Vol. 31, No. 2, Feb. pp. 293-307.OntarioLithoprobe -Grenville, Geophysics -seismics
DS1995-0471
1995
Easton, R.M.Easton, R.M.Lichens and rocks: a reviewGeoscience Canada, Vol. 21, No. 2, June pp.59-76GlobalLichen biology, Mineral exploration
DS1997-0220
1997
Easton, R.M.Corfu, F., Easton, R.M.Sharbot Lake terrane and its relationships to Frontenac terrane, Central Metasedimentary beltCanadian Journal of Earth Sciences, Vol. 34, No. 9, Sept. pp. 1239-57OntarioGeochronology, uranium-lead (U-Pb) (U-Pb), Grenville Province
DS2000-0082
2000
Easton, R.M.Berman, R.G., Easton, R.M., Nadeau, L.A new tectonometamorphic map of the Canadian Shield: introductionCan. Mineralog., Vol. 38, No. 2, Apr. pp. 277-286.Ontario, Manitoba, Alberta, Northwest TerritoriesMap, Tectonics, metamorphism
DS2000-0253
2000
Easton, R.M.Easton, R.M.Metamorphism of the Canadian Shield, II. Proterozoic metamorphic historyCan. Mineralog., Vol. 38, No. 2, Apr. pp. 319-44.OntarioMetamorphism - Proterozoic, Superior Province
DS2000-0254
2000
Easton, R.M.Easton, R.M.Metamorphism of the Canadian Shield, I. The Superior ProvinceCan. Mineralog., Vol. 38, No. 2, Apr. pp. 287-318.Ontariometamorphism, Superior Province
DS200712-0281
2007
Easton, R.M.Easton, R.M.Geology and mineral potential of the western Grimsthorpe domain, Grenville Province, insights from examination of archived diamond drill core.Ontario Geological Survey, Open File Report 6192, 15-1-15-21.Canada, OntarioGeology - Lydia Diamond
DS1960-0540
1965
Eastwood, P.L.Eastwood, P.L.A Spectrochemical Investigation of Some Peridotite Plugs In riley County, Kansas.Msc. Thesis, Kansas State University, United States, Kansas, Central StatesGeochemistry, Kimberlite
DS1960-0640
1966
Eastwood, R.L.Brookins, D.G., Eastwood, R.L.A Spectrochemical Investigation of the Bala and Stockdale Intrusion, Riley County, Kansas.Kansas Academy of Science Transactions, Vol. 68, PP. 72-87.KansasKimberlite, Central States, Geochemistry
DS2002-1367
2002
Eatom. D.W.Ross, G.M., Eatom. D.W.Proterozoic tectonic accretion and growth of western Laurentia: results from lithoprobe studies in northern Alberta.Canadian Journal of Earth Sciences, Vol. 39, No. 3, pp.313-29.AlbertaGeophysics - seismics, Tectonics
DS1995-1612
1995
EatonRoss, G., Milkereit, Eaton, White, Kanasewich, BurianykPaleoproterozoic collisional orogen beneath Western Canada sedimentary basin imaged by lithoprobe crustal..#2Geology, Vol 25, No. 3, Mar. pp. 195-9.Alberta, Western CanadaTectonics - orogeny
DS2000-0455
2000
EatonJones, A.G., Snyder, D., Asudeh, I., White, D., EatonLithospheric architecture at the Rae Hearne boundary revealed through magnetotelluric and seismic experimentGeological Association of Canada (GAC)/Mineralogical Association of Canada (MAC) 2000 Conference, 6p. abstract.Northwest Territories, Churchill, AlbertaGeophysics - seismics, magnetotellurics, Crustal - boundary
DS1995-1613
1995
Eaton, D.Ross, G.M., Milkereit, B., Eaton, D., White, D., et al.Paleoproterozoic collisional orogen beneath the western Canada sedimentary basin imaged by Lithoprobe seismics.Geology, Vol. 23, No. 3, March pp. 195-199.Alberta, Saskatchewan, OntarioSuperior Province, Geophysics -seismics
DS1998-0375
1998
Eaton, D.Eaton, D., Ross, G., Cook, F., Van der VeldenLithoprobes vault survey: pushing the depth limit of vibroseis profilingGeological Association of Canada (GAC)/Mineralogical Association of Canada (MAC) Abstract Volume, p. A50. abstract.AlbertaGeophysics - seismics, VAULT.
DS1998-1004
1998
Eaton, D.Milkereit, B., Eaton, D.Imaging and interpreting the shallow crystalline crustTectonophysics, Vol. 286, No. 1-4, Mar. 10, pp. 5-18.MantleGeophysics - seismic
DS2001-0286
2001
Eaton, D.Eaton, D., Ferguson, Jones, Hope, WuA geophysical shear sense indicator and the role of mantle lithosphere in transcurrent faulting.Slave-Kaapvaal Workshop, Sept. Ottawa, 3p. abstractNorthwest TerritoriesGeophysics, Great Slave Lake Shear Zone
DS2002-0736
2002
Eaton, D.Hope, J., Eaton, D.Crustal structure beneath the Western Canada Sedimentary Basin: constraints form gravity - magneticCanadian Journal of Earth Science, Vol.39,3,Mar.pp.291-312., Vol.39,3,Mar.pp.291-312.AlbertaGeophysics - gravity, Kimiwan High, Thorsby Low, Red Deer High, Eyehill Low
DS2002-0737
2002
Eaton, D.Hope, J., Eaton, D.Crustal structure beneath the Western Canada Sedimentary Basin: constraints form gravity - magneticCanadian Journal of Earth Science, Vol.39,3,Mar.pp.291-312., Vol.39,3,Mar.pp.291-312.AlbertaGeophysics - gravity, Kimiwan High, Thorsby Low, Red Deer High, Eyehill Low
DS2002-0788
2002
Eaton, D.Jones, A.G., Snyder, D., Hanmer, S., Asudeh, I., White, D., Eaton, D., Clarke, G.Magnetotelluric and teleseismic study across the Snowbird Tectonics Zone of theGeophysical Research Letters, Vol. 29, 17, 10.1029/2002GL015359Manitoba, Saskatchewan, AlbertaGeophysics - MT, seismics
DS200412-0498
2004
Eaton, D.Eaton, D., Vasudevan, K.Skeletonization of aeromagnetic data.Geophysics, Vol. 69, 2, pp. 478-488.Canada, Northwest Territories, QuebecLineaments, pattern recognition methodology, Great Slav
DS200612-0413
2006
Eaton, D.Fredericksen, A.W., Ferguson, I.J., Eaton, D., Miong, S-K., Gowan, E.Mantle fabric at multiple scales across an Archean Proterozoic boundary, Grenville Front, Canada.Physics of the Earth and Planetary Interiors, Vol. 158, 2-4, pp. 240-263.Canada, Ontario, QuebecGeophysics - seismics, SKS, tomography
DS200712-0328
2006
Eaton, D.Frederiksen, A.W., Ferguson, I.J., Eaton, D., Miong, S.K., Gowan, E.Mantle fabric at multiple scales across an Archean Proterozoic boundary front, Canada.Physics of the Earth and Planetary Interiors, Vol. 158, 2-4, Oct. 16, pp. 240-263.CanadaTectonics
DS200912-0196
2009
Eaton, D.Eaton, D.Lithosphere architecture of the Hudson bay region.GAC/MAC/AGU Meeting held May 23-27 Toronto, Abstract onlyCanada, Ontario, ManitobaGeophysics
DS201212-0060
2012
Eaton, D.Bastow, I.D., Kendall, J.M., Brisbourne, A.M., Snyder, D.B., Thompson, D., Hawthorne, D., Hefffrich, G.R., Wookey, J., Horleston, A., Eaton, D.The Hudson Bay lithospheric experiment.Astronomy and Geophysics, pp. 6.21-6.24.Canada, Ontario, QuebecGeophysics - seismics
DS1994-0479
1994
Eaton, D.W.Eaton, D.W., Milkereit, Kanasewich, Geis, Edwards eta l.Seismic expression of basment cover interaction in central AlbertaLithoprobe Report, No. 37, pp. 142-63.AlbertaGeophysics - seismics
DS1995-0472
1995
Eaton, D.W.Eaton, D.W., Hynes, A., Indares, A., Rivers, T.Seismic images of eclogites, crustal scale extension and MOHO relief in the eastern Grenville Province.Geology, Vol. 23, No. 9, Sept. pp. 855-858.OntarioEclogites, Geophysics -seismics
DS1995-0473
1995
Eaton, D.W.Eaton, D.W., Milkereit, B., et al.Lithoprobe basin scale seismic profiling in central Alberta: influence of basement on sedimentary cover.Canadian Petroleum Geologists Bulletin., Vol. 43, No. 1, March pp. 66-77.AlbertaBasin, Lithoprobe
DS1996-0403
1996
Eaton, D.W.Eaton, D.W., Cassidy, J.F.Proterozoic subduction beneath the Rimbey Domain? New evidence from joint interpretation of teleseismic -Ross, G.M. Lithoprobe Alberta, No. 51, pp. 19-26.AlbertaGeophysics - seismics, Teleseismics, reflection data
DS1996-0695
1996
Eaton, D.W.Jones, A.G., Eaton, D.W., White, D., Bostock, M., MareschalGeophysical measurements for lithospheric parametersGeological Survey of Canada, LeCheminant ed, OF 3228, pp. 243-250.Canada, mantleGeophysics -seismics, Lithosphere
DS1996-0961
1996
Eaton, D.W.Milkereit, B., Eaton, D.W.Towards 3-D seismic exploration technologyProspectors and Developers Association of Canada (PDAC) Short Course, pp. 17-36CanadaGeophysics -Seismic, Short course -Exploration technology
DS1997-0974
1997
Eaton, D.W.Ross, G.M., Eaton, D.W.Winagami reflection sequence: seismic evidence for post collisional magmatism in the Proterozoic of westernGeology, Vol. 25, No. 3, March pp. 197-202/AlbertaGeophysics - seismics, Magmatism
DS1997-0975
1997
Eaton, D.W.Ross, G.M., Eaton, D.W.Wingami reflection sequence: seismic evidence for Post collisional magmatism in Proterozoic Western Can.Geology, Vol 25, No. 3, Mar. pp. 199-202.Alberta, Western CanadaBasin - sedimentary
DS1997-0976
1997
Eaton, D.W.Ross, G.M., Eaton, D.W., Boerner, D.E., Clowes, R.M.Geologists probe buried craton in western CanadaEos, Vol. 78, No. 44, Nov. 4, pp. 493, 4, 7.AlbertaCraton, Geophysics - seismics
DS1997-1289
1997
Eaton, D.W.Zaleski, E., Eaton, D.W., Milkereit, B., Roberts, N..Seismic reflections from subvertical diabase dikes in an Archean terraneGeology, Vol. 25, No. 8, August pp. 707-710OntarioSuperior Province, Manitouwadge greenstone belt, Geophysics - seismics
DS1998-0376
1998
Eaton, D.W.Eaton, D.W.Intrusion of eclogites in the eastern Grenville Province: seismic and potential field test of model...Geological Society of America (GSA) Annual Meeting, abstract. only, p.A353.OntarioEclogites, Lateral-ramp model
DS1998-1257
1998
Eaton, D.W.Ross, G.M., Eaton, D.W., Boerner, D.E.Reflections on assembly of western LaurentiaGeological Society of America (GSA) Annual Meeting, abstract. only, p.A46.Northwest TerritoriesTectonic, Lithoprobe
DS1999-0186
1999
Eaton, D.W.Eaton, D.W., Ross, G.M., Clowes, R.M.Seismic reflection and potential field studies of the Vulcan structure, a Paleoproterozoic Pyrenees?Journal of Geophysical Research, Vol. 104, No. 10, pp. 23, 255-69.AlbertaGeophysics - seismics, Proterozoic basement
DS1999-0187
1999
Eaton, D.W.Eaton, D.W., Ross, G.M., Hope, J.The rise and fall of a cratonic arch; a regional seismic perspective on the Peace River Arch, Alberta.Lithoprobe, No. 47, pp. 346-61.Alberta, Western Canada Sedimentary basinGeophysics - seismics not specific to diamonds, Craton
DS1999-0188
1999
Eaton, D.W.Eaton, D.W., Ross, G.R., Clowes, R.M.Seismic reflection and potential field studies of the Vulcan structure: a paleoproterozoic Pyrenees?Journal of Geophysical Research, Vol. 104, pp.23, 255-69.Alberta, Western CanadaGeophysics - seismics, Tectonics
DS1999-0316
1999
Eaton, D.W.Hope, J., Eaton, D.W., Ross, G.M.Lithoprobe seismic transect of the Alberta Basin, compilation and reviewLithoprobe, No. 47, pp. 331-45.Alberta, Western Canada Sedimentary basinGeophysics - seismics not specific to diamonds, Basin
DS1999-0611
1999
Eaton, D.W.Ross, G.M., Eaton, D.W.Basement reactivation in the Alberta basin: observations constraints and mechanical rationale.Lithoprobe, No. 47, pp. 391-411.AlbertaGeophysics - seismics not specific to diamonds
DS2000-0255
2000
Eaton, D.W.Eaton, D.W., Asudeh, I., Jones, A.G.Constraints on mantle strain from seismic and electrical anisotropy: Great Slave Lake shear zone northwest Territories.Geological Association of Canada (GAC)/Mineralogical Association of Canada (MAC) 2000 Conference, 7p. abstract.Northwest TerritoriesGeophysics - seismics, Mantle deformation
DS2000-0256
2000
Eaton, D.W.Eaton, D.W., Atkinson, Ferguson, Adams, Asudeh, JonesPOLARIS: an in depth look at Canada's subcontinental mantle and earthquakehazards.Geological Association of Canada (GAC)/Mineralogical Association of Canada (MAC) 2000 Conference, 4p. abstract.Ontario, Northwest TerritoriesGeophysics - seismics, lithospheric, Structure - Phanerozoic
DS2000-0257
2000
Eaton, D.W.Eaton, D.W., Hynes, A.The 3 D crustal structure in the Manicouagan region: new seismic and gravity constraints.Canadian Journal of Earth Sciences, Vol.37, No.2-3, Feb.Mar, pp.307-24.QuebecGeophysics - seismics, Tectonics - Manicouagan
DS2000-0258
2000
Eaton, D.W.Eaton, D.W., Ross, G.M., Cook, F.A., VanderVelden, A.Seismic imaging of the upper mantle beneath the Rocky Mountain foreland, southwestern Alberta.Canadian Journal of Earth Sciences, Vol.37, No.11, Nov.pp.1493-07.Alberta, southwesternTectonics, Geophysics - seismics
DS2000-0834
2000
Eaton, D.W.Ross, G.M., Eaton, D.W.Evolution of Precambrian lithosphere in western Canada: continental growth and implications for Phanerozoic..Geological Association of Canada (GAC)/Mineralogical Association of Canada (MAC) 2000, 4p. abstract.Alberta, Saskatchewan, Western CanadaCraton - cratonic basins, Laurentia - Alberta basement transects, Peace River Arc
DS2000-0835
2000
Eaton, D.W.Ross, G.M., Eaton, D.W., Boerner, D., Miles, W.Tectonic entrapment and its role in the evolution of continental lithosphere: an example from Precambrian...Tectonics, in pressAlberta, Western CanadaTectonics - lithopshere
DS2002-1368
2002
Eaton, D.W.Ross, G.M., Eaton, D.W.Proterozoic tectonic accretion and growth of western Laurentia: results from lithoprobe studies in N. Alta.Canadian Journal of Earth Science, Vol.39,3,Mar.pp.313-29., Vol.39,3,Mar.pp.313-29.AlbertaGeophysics - seismics, gravity, Great Slave Lake Shear, Buffalo Head, Chinchaga domains
DS2002-1369
2002
Eaton, D.W.Ross, G.M., Eaton, D.W.Proterozoic tectonic accretion and growth of western Laurentia: results from lithoprobe studies in N. Alta.Canadian Journal of Earth Science, Vol.39,3,Mar.pp.313-29., Vol.39,3,Mar.pp.313-29.AlbertaGeophysics - seismics, gravity, Great Slave Lake Shear, Buffalo Head, Chinchaga domains
DS2003-0362
2003
Eaton, D.W.Eaton, D.W., Hope, J.Structure of the crust and upper mantle of the Great Slave Lake shear zoneCanadian Journal of Earth Sciences, Vol. 40, 9,Sept. 1203-1218.Northwest TerritoriesGeophysics - seismics, tectonics
DS200412-0499
2003
Eaton, D.W.Eaton, D.W., Hope, J.Structure of the crust and upper mantle of the Great Slave Lake shear zone, northwestern Canada, from teleseismic analysis and gCanadian Journal of Earth Sciences, Vol. 40, 9,Sept. 1203-1218.Canada, Northwest TerritoriesGeophysics - seismics, tectonics
DS200612-0007
2006
Eaton, D.W.Aktas, K., Eaton, D.W.Upper mantle velocity structure of the lower Great Lakes region.Tectonophysics, Vol. 420, 1-2, pp. 267-281.Canada, OntarioGeophysics - seismics
DS200612-0361
2006
Eaton, D.W.Eaton, D.W.Multi-genetic origin of the continental MOHO: insights from lithoprobe.Terra Nova, Vol. 18, 1, Feb. pp. 34-43.MantleGeophysics - seismic anisotropy
DS200612-0362
2006
Eaton, D.W.Eaton, D.W., Jones, A.Tectonic fabric of the subcontinental lithosphere: evidence from seismic magnetotelluric and mechanical anisotropy.Physics of the Earth and Planetary Interiors, Vol. 158, 2-4, pp. 85-91.MantleGeophysics - seismics
DS200712-0282
2006
Eaton, D.W.Eaton, D.W., Jones, A.Tectonic fabric of the subcontinental lithosphere: evidence from seismic magnetotelluric and mechanical anistropy.Physics of the Earth and Planetary Interiors, Vol. 158, 2-4, Oct. 16, pp. 85-91.MantleGeophysics - seismics
DS200712-0327
2007
Eaton, D.W.Frederickson, A.W., Miong, S.K., Darbyshire, F.A., Eaton, D.W., Rondenay, S., Sol, S.Lithospheric variations across the Superior Province, Ontario Canada: evidence from tomographic wave splitting.Journal of Geophysical Research, Vol. 112, B7, B07318.Canada, OntarioGeophysics - seismics
DS200712-0661
2007
Eaton, D.W.Ma, S., Eaton, D.W.Western Quebec seismic zone ( Canada): clustered, midcrustal seismicity along a Mesozoic hot spot track.Journal of Geophysical Research, Vol. 112, B6, B06305.Canada, QuebecGeophysics - seismics
DS200812-0527
2008
Eaton, D.W.Jones, A.G., Evans, R.L., Eaton, D.W.Velocity conductivity relationships for mantle mineral assemblages in Archean cratonic lithosphere based on a review of laboratory dat a and Hashin-Shtrikman extremal bonds.Lithos, In press available 59p.MantleUHP
DS200912-0197
2009
Eaton, D.W.Eaton, D.W., Darbyshire, F., Evans, R.L., Grutter, H., Jones, A.G., Yuan, X.The elusive lithosphere asthenosphere boundary ( LAB) beneath cratons.Lithos, Vol. 109, 1-2, pp. 1-22.MantleBoundary
DS200912-0342
2009
Eaton, D.W.Jones, A.G., Evans, R.L., Eaton, D.W.Velocity conductivity relationships for mantle mineral assemblages in Archean cratonic lithosphere based on a review of laboratory dat a and Hashin Strikman boundsLithos, Vol. 109, 1-2, pp. 131-143.MantleMineral chemistry
DS201012-0066
2010
Eaton, D.W.Bostock, M.G., Eaton, D.W., Snyder, D.B.Teleseismic studies of the Canadian landmass: lithoprobe and its legacy.Canadian Journal of Earth Sciences, Vol. 47, 4, pp. 445-461.CanadaGeophysics - seismic
DS201012-0136
2010
Eaton, D.W.Darbyshire, F.A., Eaton, D.W.The lithospheric root beneath Hudson Bay, Canada from Rayleigh wave dispersion: no clear seismological distinction between Archean and Proterozoic mantle.Lithos, Vol. 120, 1-2, Nov. pp. 144-159.Canada, Ontario, Manitoba, QuebecGeophysics - seismics
DS201012-0177
2010
Eaton, D.W.Eaton, D.W., Darbyshire, F.Lithospheric architecture and tectonic evolution of the Hudson Bay region.Tectonophysics, Vol. 480, 1-4, pp. 1-22.Canada, OntarioOrogen
DS201012-0786
2010
Eaton, D.W.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
DS201112-0066
2011
Eaton, D.W.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
Eaton, D.W.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 -
DS201112-1039
2011
Eaton, D.W.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
DS201212-0543
2012
Eaton, D.w.Pawlak, A., Eaton, D.w.,Darbyshire, F., Lebedev, S., Bastow, I.D.Crustal anisotropy beneath Hudson Bay from ambient noise tomography: evidence for post-orogenic lower crustal flow?Journal of Geophysical Research, in preparationCanada, Ontario, QuebecGeophysics - seismics
DS201212-0544
2012
Eaton, D.W.Pawlak, A., Eaton, D.W., Darbyshire, F., Lebedev, S., Bastow, I.D.Crustal anisotropy beneath Hudson Bay from ambient noise tomography: evidence for post-orogenic lower crustal flow?Journal of Geophysical Research, Vol. 117, B8 B08301Canada, Ontario, QuebecTomography
DS201503-0136
2015
Eaton, D.W.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.
DS200412-1531
2004
Eaton, D.W.S.Perry, H.K.C., Forte, A.M., Eaton, D.W.S.Upper mantle thermochemical structure below North America from seismic geodynamic flow models.Geophysical Journal International, Vol. 154, 2, pp. 279-299.Canada, Northwest TerritoriesGeothermometry, geophysics - seismics, discontinuity
DS201012-0118
2010
Eaton, D.W.S.Cook, F.A., White, D.J., Jones, A.G., Eaton, D.W.S., Hall, J., Clowes, R.M.How the crust meets the mantle: lithoprobe perspectives on the Mohorovicic.Canadian Journal of Earth Sciences, Vol. 47, 4, pp. 315-351.Mantle, CanadaGeophysics - seismic
DS2003-1068
2003
Eaton, F.W.S.Perry, H.K.C., Forte, A.M., Eaton, F.W.S.Upper mantle thermochemical structure below North America from seismicGeophysical Journal International, Vol. 154, 2, pp. 279-99.MantleGeophysics - seismics, Discontinuity
DS1996-0404
1996
Eaton, G.P.Eaton, G.P.Industrial Diamond... Annual Review for 1995U.s. Department Of Interior, 6p. Publishing June 1996United StatesIndustrial diamonds, Production, consumption
DS1997-0306
1997
Eaton, G.P.Eaton, G.P.Gemstones; USBM Annual Review, 1997Usbm Annual Review, 12p.United StatesEconomics - mentions diamonds, Production, Consumption
DS1995-0474
1995
Eaton, P.Eaton, P.Northern Ontario exploration project thwarted by native objectionsProspectors and Developers Association of Canada (PDAC) Preprint, 6pOntarioLegal, Native
DS1994-1487
1994
Eaton, White et al.Ross, G.M., Milkereit, Eaton, White et al.Paleoproterozoic collisional orogen beneath western Canada sedimentary basin imaged by lithoprobe crustal #1Lithoprobe Report, No. 37, pp. 40-58.Alberta, Western CanadaGeophysics - seismics
DS200612-0363
2006
Eaton-Magana, S.Eaton-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
DS200712-0283
2006
Eaton-Magana, S.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
DS200812-0308
2008
Eaton-Magana, S.Eaton-Magana, S.Hope diamond meets its match. Aurora Butterfly of Peace... coloured diamonds.The Loupe, Vol. 17, 3, summer, p. 1.United StatesTechnology - coloured diamonds
DS200812-0309
2008
Eaton-Magana, S.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
Eaton-Magana, S.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
DS201012-0833
2010
Eaton-Magana, S.Wang, W., Doering, P., Tower, J., Lu, R., Eaton-Magana, S., Johnson, P., Emerson, E., Moses, T.M.Strongly coloured pink CVD lab grown diamonds. A new generation of CVD lab-grown diamonds from Apollo Diamond Inc.Gems & Gemology, Vol. 46, 1, Spring pp. 4-17.TechnologyCVD Pink synthetics
DS201112-0295
2011
Eaton-Magana, S.Eaton-Magana, S., Lu, R.Phosphoresence in type IIb diamonds.Diamond and Related Materials, Vol. 20, 7, pp. 983-989.TechnologyType llb diamonds
DS201212-0179
2012
Eaton-Magana, S.Eaton-Magana, S., D'Haenens-Johansson, U.F.S.Recent advances in CVD synthetic diamond quality.Gems & Gemology, Vol. 48, 2, summer pp. 124-127.TechnologySynthetics
DS201212-0180
2012
Eaton-Magana, S.Eaton-Magana, S., D'Haenens-Johansson, U.F.S.Recent advances in CVD synthetic diamond quality.Gems & Gemology, Vol. 48, 2, Summer pp. 124-127.TechnologySynthetic diamonds
DS201212-0648
2012
Eaton-Magana, S.Shigley, J.E., Gilbertson, A., Eaton-Magana, S.Characteristics of colorless coated cubic zirconia ( Diamantine).Gems & Gemology, Vol. 48, 1, pp.TechnologyDiamantine
DS201508-0352
2015
Eaton-Magana, S.Eaton-Magana, S.Comparison of luminescence life times from natural and laboratory irradiated diamonds.Diamond and Related Materials, Vol 58, pp. 94-102.TechnologyDiamond - luminescence
DS201510-1766
2015
Eaton-Magana, S.Eaton-Magana, S., Ardon, T.Effect of LPHT treatment on natural Type 1A diamonds.GSA Annual Meeting, Paper 300-10, 1p. Abstract only BoothTechnologyLPHT
DS201606-1082
2016
Eaton-Magana, S.Eaton-Magana, S., Breeding, C.M.An introduction to photoluminescence spectroscopy for diamond and its application in gemology.Gems & Gemology, Vol. 52, 1, pp. 2-17.TechnologyIdentification of treated and synthetic diamonds.

Abstract: Photoluminescence (PL) spectroscopy is frequently mentioned in the gemological literature, but its relevance to the wider trade audience is rarely discussed. Due to the possibility of an undisclosed treatment or a synthetic origin, all type II diamonds (both colorless and fancy-color) and colorless type IaB diamonds submitted to gemological laboratories should ideally be tested using PL spectroscopy. Although the proportion of samples that require this testing is small, the failure to properly identify treated and synthetic diamonds could destabilize the diamond industry. This article seeks to clarify the underlying physics and methodology of this important tool for gemologists.
DS201608-1389
2016
Eaton-Magana, S.Ardon, T., Eaton-Magana, S.High temperature annealing of hydrogen rich diamonds.GSA Annual Meeting, Abstract, Poster 1p.TechnologyType IIb diamonds

Abstract: This study gives an analysis of the effect of high temperature annealing on the infrared and photoluminescence (PL) features as well as the inclusions of two hydrogen-rich diamond plates from Zimbabwe that were cut from the same rough. The samples showed strong inclusion-related zoning known as hydrogen clouds which consist of micron-sized particles of as yet undetermined structure. This allowed hydrogen-rich and hydrogen-poor areas to be compared throughout the annealing study. The diamond plates were annealed to temperatures of 300oC, 600oC, 800oC, 1000oC, 1400oC, and 1700oC. The infrared and PL, and Raman maps were collected after every temperature step to study the effects of heat on the defects, and photomicrographs were collected to study the inclusions. Several photoluminescence features were seen to decrease in size including the 637 nm peak, which is the negatively charged nitrogen-vacancy center [NV-] and the 503.2 nm peak, known as the H3 and consists of two nitrogen atoms and vacancy in the neutral charge state and normally has a high thermal stability. The H2 defect at 986.2 nm, which is the negative form of the H3, was shown to increase after annealing. The hydrogen clouds underwent dramatic changes in apparent color and particle size, going from a light translucent gray appearance to an opaque black. The particle size grew from less than one micron to an average of fourteen microns, and the hexagonal outline of the particles became noticeable. Spatial raman spectroscopy was used to show that the color change and size change were due to graphitization of the included particles.
DS201608-1401
2016
Eaton-Magana, S.Eaton-Magana, S., Ardon, T.Temperature effects on luminescence centers in natural type.Diamond and Related Materials, Vol. 69, pp. 86-95India, Africa, South AfricaType IIb diamonds

Abstract: Blue diamonds are among the rarest and most valuable of naturally occurring gemstones. In this study, 12 rough naturally-sourced type IIb diamonds were subjected to HPHT annealing, three different irradiation energies, and then all were stepwise annealed from 200 °C to 1100 °C and the optical defects were documented by changes in phosphorescence and photoluminescence spectroscopy. Several optical features that are removed from natural type IIb diamonds by HPHT processing, such as 3H, 648.2 nm peak, 776.4 nm peak, and 660 nm band (red) phosphorescence, can be reintroduced into these diamonds with subsequent electron irradiation and annealing at low-to-moderate temperatures. The thermal stability of these centers along with their spatial distribution provided additional insights into their configuration and distinguished them from nitrogen-bearing diamonds.
DS201610-1841
2016
Eaton-Magana, S.Ardon, T., Eaton-Magana, S.High temperature annealing of hydrogen-rich diamonds.GSA Annual Meeting, 1/2p. AbstractAfrica, ZimbabwePhotoluminescence

Abstract: This study gives an analysis of the effect of high temperature annealing on the infrared and photoluminescence (PL) features as well as the inclusions of two hydrogen-rich diamond plates from Zimbabwe that were cut from the same rough. The samples showed strong inclusion-related zoning known as hydrogen clouds which consist of micron-sized particles of as yet undetermined structure. This allowed hydrogen-rich and hydrogen-poor areas to be compared throughout the annealing study. The diamond plates were annealed to temperatures of 300oC, 600oC, 800oC, 1000oC, 1400oC, and 1700oC. The infrared and PL, and Raman maps were collected after every temperature step to study the effects of heat on the defects, and photomicrographs were collected to study the inclusions. Several photoluminescence features were seen to decrease in size including the 637 nm peak, which is the negatively charged nitrogen-vacancy center [NV-] and the 503.2 nm peak, known as the H3 and consists of two nitrogen atoms and vacancy in the neutral charge state and normally has a high thermal stability. The H2 defect at 986.2 nm, which is the negative form of the H3, was shown to increase after annealing. The hydrogen clouds underwent dramatic changes in apparent color and particle size, going from a light translucent gray appearance to an opaque black. The particle size grew from less than one micron to an average of fourteen microns, and the hexagonal outline of the particles became noticeable. Spatial raman spectroscopy was used to show that the color change and size change were due to graphitization of the included particles.
DS201612-2296
2016
Eaton-Magana, S.Eaton-Magana, S., Shigley, J.E.Observations on CVD-grown synthetic diamonds: a review.Gems & Gemology, Vol. 52, 3, pp. 222-245.TechnologySynthetics

Abstract: This article presents statistical data and distinctive features from several hundred faceted CVD-grown synthetic diamonds examined by GIA researchers from 2003 through June 2016. This study, the first comprehensive summary published on such a large number of gem-quality CVD synthetics, describes the reliable means of identifying them, with a focus on material currently marketed for jewelry use. Most CVD synthetic diamonds analyzed by GIA have been in the near-colorless or pink color ranges, with clarity grades comparable to those of their natural counterparts. Faceted CVD samples are generally 2 ct or less, though the sizes are increasing. They can be identified by their distinctive fluorescence pattern using the DiamondView imaging instrument, and by the detection of the silicon-vacancy defect using photoluminescence (PL) spectroscopy. Some visual gemological characteristics provide indicators, but not definitive proof, of CVD origin.
DS201702-0212
2017
Eaton-Magana, S.Eaton-Magana, S., Ardon, T., Zaitsev, A.M.Inclusion and point defect characteristics of Marange graphite bearing diamonds after high temperature annealing.Diamond and Related Materials, Vol. 71, pp. 20-29,Africa, ZimbabweDeposit - Marange

Abstract: This study gives an analysis of the effect of low-pressure, high-temperature annealing on the infrared, Raman, and photoluminescence (PL) features, as well as the inclusion characteristics, of cubo-octahedral diamond plates from the Marange deposits in Zimbabwe. The samples showed strong inclusion-related zoning which consists of micron-sized particles identified as graphite and these grew noticeably larger with annealing at temperatures of 300 °C to 1700 °C. Within the natural diamonds, the graphite inclusions (detected by Raman spectroscopy) had a grain size of approximately 1 µm, which increased to 3 µm after 1200 °C and 14 µm after 1700 °C annealing and their hexagonal morphology was discernible. From the geometry of these grains, we determined that they were oriented within the {111} family of planes. The infrared absorption and PL spatial maps were collected after every temperature step to study the effects of annealing on the defects, and photomicrographs and Raman spectra were collected to study the graphite inclusions. The graphitic inclusions grew much larger as the stressed diamond surrounding them converted to graphite. Many nitrogen-related optical centers, including NV- and H3 are no longer detected after high temperature annealing within the cuboid regions as these may have been transformed to hydrogen-bearing complexes such as NVH and N2VH. The presence of CH4 is detected in the unannealed Marange diamonds, but was no longer observed in Raman spectra after 1200 °C annealing. This CH4 disappearance along with changes in inclusion morphology could provide a method to detect heat treatment if these mixed-habit samples are sourced to create treated black gem diamond.
DS201708-1569
2017
Eaton-Magana, S.Eaton-Magana, S., Ardon, T., Zaitsev, A.M.LPHT annealing of brown to yellow type 1a diamonds.Diamond and Related Materials, Vol. 77, pp. 159-170.Technologydiamond morphology

Abstract: Low-pressure, high-temperature (LPHT) annealing of yellow-to-brown type Ia natural diamonds was performed to monitor its effects on optical centers within diamond, changes in the observed color, and to assess the process's viability as a commercial gem treatment. With LPHT annealing only, the mostly brown diamonds showed a shift towards yellow coloration; Vis-NIR absorption spectra showed this change was due to a modest increase in H3 intensity. Even at long annealing times (24 h at 1800 °C) or annealing at high temperatures (2000 °C for five minutes), the diamonds did not significantly lose brown coloration. LPHT annealing showed itself as an ineffective means to break apart the vacancy clusters causing the brown color or causing nitrogen disaggregation, which resulted in only a small H3 generation. With LPHT annealing, “amber centers”—a group of several independent bands in the IR between 4200 and 4000 cm- 1 that disappear with HPHT annealing—were seen to anneal out gradually at various temperatures from 1700 to 2000 °C. In contrast, high-pressure, high-temperature (HPHT) annealing effectively removes brown color at similar time/temperature conditions. Without the high stabilizing pressure provided by HPHT annealing techniques, the LPHT annealing showed pronounced damage on inclusions and dramatic surface etching. In subsequent experiments, LPHT annealing was used as a follow-up to laboratory irradiation. The irradiation-related vacancies created greater concentrations of H3 and the vacancy-assisted disaggregation of nitrogen created donors which led to a high concentration of H2 centers. This combination of defects resulted in a pronounced and favorable shift towards saleable yellow colors due to an increase in H3 and a dramatic increase in the H2 center, which led to the suppression of the remaining brownish component. The annealing characteristics for many centers detected by Vis-NIR absorption spectroscopy, FTIR absorption spectroscopy, and photoluminescence spectroscopy were chronicled throughout the study and compared with other LPHT annealing studies and HPHT annealing experiments.
DS201712-2684
2017
Eaton-Magana, S.Eaton-Magana, S., Shigley, J.E., Breeding, C.M.Observations on HPHT-grown synthetic diamonds: a review.Gems & Gemology, Vol. 53, 3, pp. 262-285.Technologysynthetics

Abstract: his article presents statistical data and distinctive features for several thousand HPHT-grown synthetic diamonds examined by GIA from 2007 through 2016. This study, the first comprehensive summary published on such a large number and wide variety of samples, describes the reliable means of identifying them, with a focus on material currently marketed for jewelry use. The color of HPHT synthetic diamonds analyzed by GIA has shifted noticeably during this time—in the early years, orange-yellow, yellow, and yellow-orange samples comprised the overwhelming majority, while colorless and blue samples are much more prevalent today. HPHT synthetics are making inroads into the large diamond market, with cut stones larger than 10 carats, as well as the colorless melee market, where small HPHT synthetics are being mass-produced in China. HPHT synthetics can be identified by their distinctive fluorescence patterns using the DiamondView luminescence imaging instrument, the lack of “strain” (anomalous birefringence) when viewed through crossed polarizers, and to a lesser extent by the detection of various features in photoluminescence (PL) spectroscopy. This material may also display magnetism and a short-wave fluorescence and phosphorescence reaction that are inconsistent with similarly colored natural diamonds.
DS201806-1214
2018
Eaton-Magana, S.Breeding, C.M., Eaton-Magana, S., Shigley, J.E.Natural color green diamonds: a beautiful conundrum.Gems& Gemology, Vol. 54, 1, spring pp. 2-27.South America, Brazil, Venezuela, Guyanadiamonds - green review

Abstract: Among fancy-color diamonds, natural-color green stones with saturated hues are some of the rarest and most sought after. These diamonds are colored either by simple structural defects produced by radiation exposure or by more complex defects involving nitrogen, hydrogen, or nickel impurities. Most of the world’s current production of fine natural green diamonds comes from South America or Africa. Laboratory irradiation treatments have been used commercially since the late 1940s to create green color in diamond and closely mimic the effects of natural radiation exposure, causing tremendous difficulty in gemological identification. Compounding that problem is a distinct paucity of published information on these diamonds due to their rarity. Four different coloring mechanisms—absorption by GR1 defects due to radiation damage, green luminescence from H3 defects, and absorptions caused by hydrogen- and nickel-related defects—can be identified in green diamonds. Careful microscopic observation, gemological testing, and spectroscopy performed at GIA over the last decade allows an unprecedented characterization of these beautiful natural stones. By leveraging GIA’s vast database of diamond information, we have compiled data representative of tens of thousands of samples to offer a look at natural green diamonds that has never before been possible.
DS201806-1221
2018
Eaton-Magana, S.Eaton-Magana, S.Five CVD synthetics greater than three carats: quality factorsGems & Gemology, Vol. 54, 1, p. 63.Technologysynthetics
DS201809-2017
2018
Eaton-Magana, S.Eaton-Magana, S., Breeding, C.M., Shigley, J.E.Natural color blue, gray, and violet diamonds: allure of the deep.Gems & Gemology, Vol. 54, 2, pp. 112-131.Africa, South Africa, Australiadiamond - colour

Abstract: Natural-color blue diamonds are among the rarest and most valuable gemstones. Gray and violet diamonds are also included here, as these diamonds can coexist on a color continuum with blue diamonds. More so than most other fancy colors, many diamonds in this color range are sourced from specific locations-the Cullinan mine in South Africa and the Argyle mine in Australia. Although blue color is often associated with boron impurities, the color of diamonds in this range (including gray and violet) also originates from simple structural defects produced by radiation exposure or from more complex defects involving hydrogen. These different mechanisms can be characterized by absorption and luminescence spectroscopy. A fourth mechanism-micro-inclusions of grayish clouds or tiny graphite particles in gray diamonds-can be distinguished through microscopy. In this article, we summarize prior research as well as collected data such as color and carat weight on more than 15,000 naturally colored blue/gray/violet diamonds from the GIA database (along with an analysis of spectroscopic data on a subset of 500 randomly selected samples) to provide an unprecedented description of these beautiful gemstones.
DS201901-0030
2018
Eaton-Magana, S.Eaton-Magana, S.Summary of CVD lab-grown diamonds seen at the GIA laboratory.Gems & Gemology, Sixth International Gemological Symposium Vol. 54, 3, 1p. Abstract p. 269-270..United Statessynthetics

Abstract: While chemical vapor deposition (CVD) diamond growth technology has progressed significantly in recent years, with improvements in crystal size and quality, the use of these goods in the jewelry trade is still limited. Not all CVD-grown gem diamonds are submitted to GIA for grading reports, and they only account for about 0.01% of GIA’s annual diamond intake (both D–Z equivalents and fancy color; Eaton-Magaña and Shigley, 2016). The CVD process involves diamond growth at moderate temperatures (700–1300°C) but very low pressures of less than 1 atmosphere in a vacuum chamber (e.g., Angus and Hayman, 1988; Nad et al., 2015). This presentation summarizes the quality factors and other characteristics of the CVD-grown material submitted to GIA (e.g., figure 1) and discusses new research and products. Today the CVD process is used to produce high-color (as well as fancy-color) and high-clarity type II diamonds up to several carats in size. The majority of the CVD material seen at GIA consists of near-colorless (G–N equivalent) with colorless (D–F equivalent) and various “pink” hues. Additionally, CVD material is constantly setting new size milestones, with the announcement of an approximately 6 ct round brilliant earlier this year (Davis, 2018). However, the attainable sizes among CVD products are dwarfed by those from the HPHT process, with 15.32 ct as the current record for a faceted gem (Ardon and Eaton-Magaña, 2018). One particular challenge for gemologists (albeit very rarely encountered) comes from the lab-grown/natural hybrids (figure 2) that have been submitted to and documented by gemological laboratories (e.g., Moe et al., 2017; Tang et al., 2018). In these specimens, the grower places a natural diamond into the CVD reactor as the seed plate, with both components retained in the faceted gem. If the manufacturer is using a colorless natural type Ia diamond as a seed plate for near-colorless CVD growth, the hybrid cannot undergo any post-growth HPHT treatment, as this would radically alter the natural seed by turning the natural diamond yellow. If the manufacturer is creating a CVD overgrowth layer on a faceted natural diamond, the intent is to either add weight to a diamond that may be near a weight boundary or to achieve a color change, typically to blue. These hybrid products also make it more difficult to infer a diamond’s history based solely on its diamond type. The CVD process has also created some unique gems that have not been duplicated among natural, treated, or HPHT-grown diamonds. These include CVD-grown diamonds with a high concentration of silicon impurities, which create a pink to blue color shift. In those samples, a temporary effect was activated by UV exposure, which precipitated a charge transfer between negative and neutral silicon-vacancy centers (D’Haenens-Johansson et al., 2015). Also recently seen are type IIb CVD goods. Some that were submitted by clients had a low boron concentration (3 ppb, with G-equivalent color and 1.05 carat weight). Meanwhile, some research samples produced by a manufacturer in China and fashioned as flat plates had dark bluish coloration and very high boron concentration (2500 ppb and higher). Also among that suite of flat-plate CVD samples was one with a black color caused by extremely high amounts of nitrogen-vacancy centers. Although new CVD products are continually being manufactured and introduced to the trade, the laboratory-grown diamonds examined to date by GIA can be readily identified.
DS201903-0505
2018
Eaton-Magana, S.Eaton-Magana, S., Ardon, T., Smit, K.V., Breeding, C.M., Shigley, J.E.Natural color pink, purple, red and brown diamonds: band of many colors.Gems & Gemology, Vol. 54, 4, pp. 352-377.Global, Australiadiamond colour

Abstract: Diamond is one of Earth’s most extraordinary materials. It represents the pinnacle for several material and physical properties. As a gem, however, it is the near-perfect examples—diamonds attaining the D-Flawless distinction—and those with imperfections resulting in a vibrant or surprising color that create the most enduring impressions. Fancy-color natural diamonds are among the most highly valued gemstones due to their attractiveness and great rarity. The 18.96 ct Winston Pink Legacy, with a color grade of Fancy Vivid pink, recently made history by selling at over $50 million, its $2.6 million per carat price an all-time high for a pink diamond (Christie’s, 2018).
DS202001-0009
2019
Eaton-Magana, S.Eaton-Magana, S., Ardon, T., Breeding, C.M., Shigley, J.E.Natural color fancy white and fancy black diamonds: where color and clarity converge.Gems & Gemology, Vol. 55, 3, pp. 320-336.Globalreview

Abstract: Natural Fancy white and Fancy black diamonds are not routinely submitted to GIA for grading (fewer than 2,000 since 2008). These fancy-color diamonds are distinctive since the causes of color generally are not atomic-scale defects, but nanometer- to micrometer-sized inclusions that reduce the diamond’s transparency by scattering or absorbing light (some exceptions exist among Fancy black diamonds). To clarify, Fancy white diamonds are those rare stones colored by inclusions that give a “whitish” appearance, and are distinct from “colorless” diamonds on the D-to-Z scale. These two colors, often thought of as opposites in the color world, are grouped here as outliers within the colored diamond world. Both can be colored by inclusions so numerous the stone would fall below the I3 grade on the clarity scale, demonstrating that inclusions, often perceived as a negative quality factor, can create a distinctive appearance. Among the Fancy white diamonds examined for this study, the vast majority (82%) were type IaB, making them a rare subset of a rare diamond type. Based on prior geological research, these are surmised to be mostly sublithospheric in origin (i.e., forming more than 250 km below the earth’s surface). The Fancy white diamonds generally have a different chemistry from D-to-Z type IaB diamonds, with greater quantities of several hydrogen- and nickel-related defects. Among Fancy black diamonds, the major causes of color are either micrometer-sized dark crystal inclusions, nanometer-sized inclusions clustered into clouds, or a combination of the two. For these two colors of diamond, we summarize their gemological properties along with the absorption and luminescence spectra of a representative subset of diamonds from each color, examining how they deviate from the standard grading methodology. Because of their rarity, there has been very little systematic study of either of these color categories, and never a sample set of this quantity, which includes data for ~500 Fancy white and ~1,200 Fancy black diamonds.
DS202012-2208
2020
Eaton-Magana, S.Breeding, C.M., Eaton-Magana, S., Shigley, J.E.Naturallly colored yellow and orange gem diamonds: the nitrogen factor.Gems & Gemology, Vol. 56. 2. summer pp. 194-219. pdfGlobalnitrogen

Abstract: Natural yellow gem diamonds are the most common of the fancy-color diamonds, while orange diamonds are among the rarest when they have unmodified hues. Both categories owe their coloration to atomic-level lattice defects associated with nitrogen impurities in the diamond structure. Four major groups of defects are responsible for the color in nearly all yellow and orange diamonds: cape defects (N3 and associated absorptions), isolated nitrogen defects, the 480 nm visible absorption band, and H3 defects. Nitrogen-bearing diamonds are thought to incorporate isolated nitrogen during growth by substitution for carbon, meaning that natural diamonds start out with yellow to orange color. However, only the very rare type Ib diamonds maintain that original color. With time at high temperatures deep in the earth, the nitrogen atoms in most diamonds aggregate, resulting in either near-colorless stones or yellow diamonds colored by cape defects. Yellow and orange diamonds can be grown in a laboratory or created by color treatments, so a thorough understanding of the defects responsible for color in the natural stones is critical for identification. Yellow diamonds serve as the best ambassador to the colored diamond world due to their abundance and may be the only colored diamond many people will ever see in a jewelry store.
DS201112-0296
2011
Eaton-Magana, S.C.Eaton-Magana, S.C.Observation of strain through photoluminescence peaks in diamonds.Gems & Gemology, Summer issue ... abstracts from GIA p. 132.TechnologyType IIa brown
DS201603-0374
2016
Eaton-Magana, S.C.Eaton-Magana, S.C., Moe, K.S.Temperature effects on radiation stains in natural diamonds.Diamond and Related Materials, in press available 29p.TechnologyGreen diamonds

Abstract: The green coloration of natural diamonds typically results from exposure to natural irradiation. This creates the GR1 optical center and in many diamonds, surficial damage, principally due to alpha radiation, which helps verify natural origin. In this study, 13 naturally irradiated diamonds with pronounced radiation stains were stepwise annealed from 200 °C to 1400 °C and the changes in color and defects were documented by photomicrography and spectroscopy. Additionally 3 diamonds were subjected to isothermal annealing at 550 °C. The radiation stains correlated with radiation-damage Raman peaks — a broad and shifted diamond Raman peak and radiation-related peaks at 1500 and 1640 cm- 1. The color transitioned from green to brown after heating to 550-600 °C and the stains were essentially decolorized at 1400 °C. Confocal Raman depth profiling showed that the depth penetration of the radiation stain was about 10-15 µm into the diamond and this depth profile was distinctly different from depth profiles of ion-irradiation stains generated in a laboratory.
DS202006-0918
2020
Eaton-Magana. S.Eaton-Magana. S., McElhenny, G., Breeding, C.M., Ardon, T.Comparison of gemological and spectroscopic features in type IIa and Ia natural pink diamonds.Diamonds & Related Materials, Vol. 105, 13p. PdfMantlenitrogen

Abstract: The majority of natural pink diamonds have a color origin due to absorption from a broad 550?nm band that has been associated with plastic deformation. One consistent feature in the photoluminescence spectra of these pink diamonds is a wide emission band extending from ~600 to 750?nm, with a series of smaller oscillations overlaid on the larger emission band. This "pink emission band" is seen in diamonds colored by the 550?nm absorption band; the absorption band often, but not always, shows similar oscillations at ~600?nm (called the 609?nm system by previous researchers). This emission band served as a proxy for the 550?nm absorption band as we performed spatial mapping to chronicle the differences between the uniform coloration in type IIa pink diamonds and the pronounced banding in type Ia pink diamonds. We also used Raman spectroscopy to identify the internal crystal inclusions present in type IIa pink diamonds and determined that the majority have a sub-lithospheric origin.
DS2003-0227
2003
Eaves, L.Catherall, A.T., Eaves, L., King, P.J., Booth, S.R.Magnetic levitation: floating gold in cryogenic oxygenNature, Vol. 6932, April 10, pp. 579.MantleGeophysics - magnetics
DS200412-0296
2003
Eaves, L.Catherall, A.T., Eaves, L., King, P.J., Booth, S.R.Magnetic levitation: floating gold in cryogenic oxygen.Nature, Vol. 6932, April 10, pp. 579.MantleGeophysics - magnetics
DS1993-0388
1993
Ebbesen, T.W.Ebbesen, T.W.How to profit from fullerenes: winning strategies for emerging marketsNature, Vol. 361, No. 6409, January 21, p. 218GlobalFullerenes, Carbon
DS1995-0475
1995
Ebbesen, T.W.Ebbesen, T.W., et al.Origins of fullerenes in rocksScience, Vol. 268, June 16, pp. 1634-5.GlobalFullerenes
DS1975-0532
1977
Ebbett, B.E.Houston, R.S., Ebbett, B.E.Geologic Map of the Sierra Madre and Western Medicine Bow Mountains, Southeastern Wyoming.United States Geological Survey (USGS) FIELD STUDIES MAP, MF-827, L: 125, 000.United States, Wyoming, Rocky Mountains, Medicine Bow MountainsBlank
DS201412-0782
2014
Ebbing, J.Schrieber-Enslin, S., Ebbing, J., Webb, S.J.An integrated geophysical study of the Beattie Magnetic Anomaly.Tectonophysics, in press available 16p.Africa, South AfricaGeophysics - magnetics
DS201510-1767
2015
Ebbing, J.Eyike, A., Ebbing, J.Lithospheric structure of the West and Central African Rift system from regional three dimensional gravity modelling. South African Journal of Geology, Vol, 118, no. 3, pp. 285-298.Africa, East AfricaGeophysics - gravity

Abstract: A three-dimensional interpretation of the central part of the West and Central African Rift System (WCARS) is presented using the Earth Gravity Model 2008 (EGM2008). The 3-D model presented here provides new insights into the regional lithospheric structure of the central sector of the WCARS. The 3-D model reveals a possible crustal thickness and density distribution beneath the rift system, and the depth extent of magmatic activity in the Benue Trough is revealed for the first time. Because of asthenospheric uplift, the crust under the Benue Trough is thinned. The zone of crustal thinning (<30 km) coincides with the trace of an intrusion beneath the trough, and the maximum of which is attained in the Yola Basin. The Adamawa and Kapsiki Plateaus, on the other hand, show by far the largest crustal thickness in the region (34 to 36 km). The inferred zone of intrusion coincides with the maximum gravity anomaly of the rift zone. The great depth (ca. 14 km) to the top of the intrusion along the rift may explain the absence of magmatism in the Benue Trough compared to the Cameroon Volcanic Line (CVL) or the East African Rift System (EARS). The relatively small nature of the intrusion leads to the conclusion that small-scale asthenospheric upwelling might be responsible for the thinning of the crust and subsequent rifting of the Benue Trough.
DS201510-1802
2015
Ebbing, J.Scheiber-Enslin, S.E., Ebbing, J., Webb, S.J.New depth maps of the main Karoo basin, used to explore the Cape isostatic anomaly, South Africa.South African Journal of Geology, Vol. 118, 3, pp. 225-248.Africa, South AfricaGeophysics - seismics

Abstract: Here we present a comprehensive depth and thickness map of the main Karoo and Cape Basins using borehole and reflection seismic data. The depth to the Whitehill Formation, which is the focus of current shale gas interest within the Karoo, is also mapped. Change: The deepest part of the basin is in the south, along the northern boundary of the Cape Fold Belt (~4000 m in the southwest Karoo and ~5000 m in the southeast; ~5500 to 6000 m sediment thickness). The Whitehill Formation along this boundary reaches a depth of ~3000 m in the southwest and ~4000 m in the southeast. Limited borehole data in the southeastern Karoo show a broad deepening of the basin here compared to the southwestern Karoo. In the southeast near East London faulting has resulted in deepening of the basin close to the coast, with the Whitehill Formation deepening to over ~5000 km. Seismic and borehole data show that the Cape Supergroup pinches out below the Karoo Basin around Beaufort West and Graaff-Reinet in the southern Karoo (32.6°S for the Bokkeveld and 32.4°S for the Table Mountain Group). The Cape Supergroup reaches thicknesses of around 4 km in the south. The gravity effect of these sediments does not account for the Cape Isostatic Anomaly (CIA) in the southern part of the Karoo Basin near Willowmore and Steytlerville, i.e., an ~45 mGal Bouguer gravity low. A refraction seismic profile over the anomaly shows this region is associated with a large volume of low velocity/density shallow sediments (4.5 m/s2, 2500 kg/m3), as well as a low velocity/density anomaly associated with a normal fault and the Klein Winterhoek Thrust Fault (5.5 m/s2, 2650 kg/m3). These low density shallow sediments are explained by uplift of Karoo and Cape sediments of ~2 km or greater that is evident on Soekor reflection seismic data. This deformation has brought lower density shales (1800 to 2650 kg/m3) of the Ecca Group closer to the surface. These shallower features along with a deeper lower crust in this region (6.5 m/s2, 2900 kg/m3) are interpreted to account for the CIA.
DS1992-0407
1992
Ebdon, D.Ebdon, D.SPANS- a Quadtree-based GISComputers and Geosciences, Vol. 18, No. 4, pp. 471-475GlobalComputer, Programs -Geographic information systems -SPANS
DS201012-0075
2010
Ebel, D.Brusentsova, T.N., Peale, R.E., Maukonen, D., Harlow, G.E., Boesenberg, J.S., Ebel, D.Far infrared spectroscopy of carbonate minerals.American Mineralogist, Vol. 95, pp. 1515-1522.TechnologyIR - not specific to diamonds
DS201112-0297
2010
Eberhardt, D.B.Eberhardt, D.B.Prospeccao geoquimica preliminar da Folha Paranantinga - Mato Grosso.5th Brasilian Symposium on Diamond Geology, Nov. 6-12, abstract p. 56-57.South America, Brazil, Mato GrossoGeochemical sampling
DS1995-0476
1995
Eberhardt-Phillips, D.Eberhardt-Phillips, D., Stanley, W.D., et al.Surface seismic and electrical methods to detect fluids related tofaultingJournal of Geophysical Research, Vol. 100, No. B 7, July 10, pp. 12, 919-12, 936GlobalGeophysics -seismics, Fluids -faulting
DS1970-0507
1972
Eberhart, P.Eberhart, P.Treasure tales of the Rockies...The Great Diamond Fields....Sage Books, pp. 148-153.ColoradoHistory, Diamond Hoax
DS1996-0405
1996
Eberle, D.Eberle, D., Hutchins, D.G., Rebbeck, R.J., Somerton, I.Compilation of the Namibian airborne magnetic surveys: procedures, problem sand results.Journal of African Earth Sciences, Vol. 22, No. 2, Feb. pp. 191-206.NamibiaGeophysics -magnetics, Compilation
DS2002-0413
2002
Eberle, D.G.Eberle, D.G., Andritzkym G., Hutchins, D.G., Wackerle, R.The regional magnetic data set of Namibia: compilation, contributions to crustal studies and support to natural resource management.South African Journal of Geology, Vol. 105, No. 4, pp. 361-80.NamibiaGeophysics - magnetics, Structure
DS2002-0414
2002
Eberle, M.A.Eberle, M.A., Grasset, O., Sotin, C.A numerical study of the interaction between the mantle wedge, subducting slab and overriding plate.Physics of the Earth and Planetary Interiors, Vol. 134, 3-4, Dec. 22, pp. 191-202.MantleSubduction, Tomography
DS201512-1915
2015
Ebert, K.Ebert, K., Brodaric, B.GIS analyses of ice-sheet erosional impacts on the exposed shield of Baffin Island, eastern Canadian Arctic.Canadian Journal of Earth Sciences, Vol. 52, 11, pp. 966-979.Canada, Nunavut, Baffin IslandGeomorphology

Abstract: The erosional impacts of former ice sheets on the low-relief bedrock surfaces of Northern Hemisphere shields are not well understood. This paper assesses the variable impacts of glacial erosion on a portion of Baffin Island, eastern Canadian Arctic, between 68° and 72°N and 66° and 80°W. This tilted shield block was covered repeatedly by the Laurentide Ice Sheet during the late Cenozoic. The impact of ice-sheet erosion is examined with GIS analyses using two geomorphic parameters: lake density and terrain ruggedness. The resulting patterns generally conform to published data from other remote sensing studies, geological observations, cosmogenic exposure ages, and the distribution of the chemical index of alteration for tills. Lake density and terrain ruggedness are thereby demonstrated to be useful quantitative indicators of variable ice-sheet erosional impacts across Baffin Island. Ice-sheet erosion was most effective in the lower western parts of the lowlands, in a west-east-oriented band at around 350-400 m a.s.l., and in fjord-onset zones in the uplifted eastern region. Above the 350-400 m a.s.l. band and between the fjord-onset zones, ice-sheet erosion was not sufficient to create extensive ice-roughened or streamlined bedrock surfaces. The exception — where lake density and terrain ruggedness indicate that ice-sheet erosion had a scouring effect all across the study area — was in an area from Foxe Basin to Home Bay with elevations <400 m a.s.l. These morphological contrasts link to former ice-sheet basal thermal regimes during the Pleistocene. The zone of low glacial erosion surrounding the cold-based Barnes Ice Cap probably represents the ice cap’s greater extent during successive Pleistocene cold stages. Inter-fjord plateaus with few ice-sheet bedforms remained cold-based throughout multiple Pleistocene glaciations. In contrast, zones of high lake density and high terrain ruggedness are a result of the repeated development of fast-flowing, erosive ice in warm-based zones beneath the Laurentide Ice Sheet. These zones are linked to greater ice thickness over western lowland Baffin Island. However, adjacent lowland surfaces with similar elevations of non-eroded, weakly eroded, and ice-scoured shield bedrock indicate that—even in areas of high lake density and terrain ruggedness—the total depth of ice sheet erosion did not exceed 50 m.
DS2002-1371
2002
Ebihara, M.Roy, A., Sarkar, A., Jeyakumar, S., Aggrawal, S.K., Ebihara, M.Sm Nd age and mantle source characteristics of the Dhanjori volcanic rocks, eastern India.Geochemical Journal, Vol. 36, 5, pp. 503-18.IndiaGeochronology, magmatism
DS2003-0814
2003
Ebihara, M.Li, X.L., Ebihara, M.Determination of all platinum group elements in mantle derived xenoliths by neutronJournal of Radioanalytical and Nuclear Chemistry, Vol. 255, 1, pp. 131-35.GlobalXenoliths - not specific to diamonds
DS200512-0915
2004
Ebihara, M.Roy, A., Sarkar, A., Jeyakumar, S., Aggrawal, S.K., Ebihara, M., Satoh, H.Late Archean mantle metasomatism below eastern Indian Craton: evidence from trace elements, REE geochemistry and Sr Nd O isotope systematics of ultramafic dykes.Proceedings National Academy of Sciences India , Vol. 113, 4, pp. 649-666. Ingenta 1045680437IndiaMetasomatism, geochemistry
DS200512-0916
2004
Ebihara, M.Roy, A., Sarkar, A., Jeyakumar, S., Aggrawal, S.K., Ebihara, M., Satoh, H.Late Archean mantle metasomatism below eastern Indian craton: evidence from trace elements, REE geochemistry and Sr Nd O isotope systematics of ultramafic dykes.Proceedings National Academy of Sciences India , Vol. 113, 4, pp. 649-665.India, AsiaPeridotite, harzburgite, geochronology
DS1997-0307
1997
Ebinger, C.Ebinger, C., Djomani, Y.P., Mbede, E., Foster, DawsonRifting Archean lithosphere: the Eyasi Manyara Natron Rifts, East AfricaJournal of the Geological Society of London, Vol. 154, pp. 947-960.Tanzania, East AfricaTectonics, Geophysics - gravity anomalies
DS1997-0357
1997
Ebinger, C.Foster, A., Ebinger, C., Rex, D.Tectonic development of the northern Tanzanian sector of the East African rift systemJournal of Geological Society, Vol. 154, No. 4, July pp. 689-699.TanzaniaTectonics, Rifting
DS2000-0653
2000
Ebinger, C.Menzies, M.A., Ebinger, C.Volcanic rifted margins. Penrose conference reportGsa Today, Aug, pp. 8-11.MantleMagmatism, plumes, rifting
DS2000-0761
2000
Ebinger, C.Petit, C., Ebinger, C.Flexure and mechanical behaviour cratonic lithosphere: gravity models of East African and Baikal riftsJournal of Geophysical Research, Vol. 105, No.8, Aug. 10, pp.19151-62.Russia, East Africa, Tanzania, KenyaGeophysics - gravity, Craton
DS2002-0474
2002
Ebinger, C.Fowler, C.M.R., Ebinger, C., Hawkesworth, C.J.The Early Earth: physical, chemical and biological developmentGeological Society of London (U.K.), 352p.$ 142.00 http://bookshop.geolsoc.org.ukMantleBook - tectonics, deformation, lithosphere, Geophysics, models, plumes
DS201905-1056
2019
Ebinger, C.Lavayssiere, A., Drooff, C., Ebinger, C., Gallacher, R., Illsley-Kemp, F., Finnigan, Oliva, S.J., Keir, D.Deep extent and kinematics of faulting in the southern Tanganyika Rift, Africa.Tectonics, Vol. 38, 3, pp. 842-862.Africarifting

Abstract: Unusually deep earthquakes occur beneath rift segments with and without surface expressions of magmatism in the East African Rift system. The Tanganyika rift is part of the Western rift and has no surface evidence of magmatism. The TANG14 array was deployed in the southern Tanganyika rift, where earthquakes of magnitude up to 7.4 have occurred, to probe crust and upper mantle structure and evaluate fault kinematics. Four hundred seventy-four earthquakes detected between June 2014 and September 2015 are located using a new regional velocity model. The precise locations, magnitudes, and source mechanisms of local and teleseismic earthquakes are used to determine seismogenic layer thickness, delineate active faults, evaluate regional extension direction, and evaluate kinematics of border faults. The active faults span more than 350 km with deep normal faults transecting the thick Bangweulu craton, indicating a wide plate boundary zone. The seismogenic layer thickness is 42 km, spanning the entire crust beneath the rift basins and their uplifted flanks. Earthquakes in the upper mantle are also detected. Deep earthquakes with steep nodal planes occur along subsurface projections of Tanganyika and Rukwa border faults, indicating that large offset (=5 km) faults penetrate to the base of the crust, and are the current locus of strain. The focal mechanisms, continuous depth distribution, and correlation with mapped structures indicate that steep, deep border faults maintain a half-graben morphology over at least 12 Myr of basin evolution. Fault scaling based on our results suggests that M > 7 earthquakes along Tanganyika border faults are possible.
DS1989-0386
1989
Ebinger, C.J.Ebinger, C.J.Tectonic development of the western branch of the East African riftsystemGeological Society of America (GSA) Bulletin, Vol. 101, No. 7, July pp. 885-903Kenya, East AfricaTectonics, Rifts
DS1989-0387
1989
Ebinger, C.J.Ebinger, C.J., Karner, G.D., Weissell, J.K.Mechanism of rift flank uplift: examples from East AfricaEos, Vol. 70, No. 43, October 24, p. 1336. AbstractEast AfricaTectonics, Rift
DS1991-0417
1991
Ebinger, C.J.Ebinger, C.J., Karner, G.D., Weissel, J.M.Mechanical strength of extended continental lithosphere -constraints From the western Rift system, East AfricaTectonics, Vol. 10, No. 6, Decemberpp. 1239-1258East AfricaTectonics, western Rift system
DS1992-1533
1992
Ebinger, C.J.Tesha, A.L., Ebinger, C.J., Nyamweru, C.Rift related volcanic hazards in Tanzania and their mitigationTectonophysics, Vol. 209, pp. 277-279TanzaniaTectonics, Rift Zones
DS1998-0377
1998
Ebinger, C.J.Ebinger, C.J., Sleep, N.H.Cenozoic magmatism throughout East Africa resulting from impact of a singleplume.Nature, Vol. 395, Oct. 22, pp. 788-91.East Africa, Madagascar, EthiopiaLithosphere - plume, Tectonics
DS1998-1543
1998
Ebinger, C.J.Vidotti, R.M., Ebinger, C.J., Fairhead, J.D.Gravity signature of the western Parana basin, BrasilEarth and Plan. Sci. Lett, Vol. 159, pp. 117-32BrazilGeophysics - gravity, Bouguer, Flood basalts
DS2000-0711
2000
Ebinger, C.J.Nnange, J.M., Ngako, V., Fairhead, J.D., Ebinger, C.J.Depths to density discontinuities beneath the Adamawa Plateau region, from spectral analyses of gravity data.Journal of African Earth Sciences, Vol. 30, No. 4, May pp. 887-901.Central AfricaGeophysics - gravity, Remte sensing
DS2000-0712
2000
Ebinger, C.J.Nnange, J.M., Ngako, V., Fairhead, J.D., Ebinger, C.J.Depths to density discontinuities beneath the Adamawa Plateau region: from spectral analysis - gravity data.Journal of African Earth Sciences, Vol. 30, No. 4, May pp. 887-901.Central AfricaGeophysics - seismics, gravity, Discontinuity
DS2002-0475
2002
Ebinger, C.J.Fowler, C.M.R., Ebinger, C.J., Hawkesworth, C.J.The early Earth: physical, chemical and biological developmentsGeological Society of London Special Publication, No. 199, 352p. $ 142. http://bookshop.geolsoc.org.ukBookArchean lithosphere, petrology, geophysics, structure, craton - evolution, models, environment
DS2002-1047
2002
Ebinger, C.J.Menzies, M.A., Klemperer, S.L., Ebinger, C.J., Baker, J.Volcanic rifted marginsGeological Society of America Special Paper, 362, 230p.GlobalBook - volcanism, tectonics
DS2002-1048
2002
Ebinger, C.J.Menzies, M.A., Klemperer, S.L., Ebinger, C.J., Baker, J.Characteristics of volcanic rifted marginsGeological Society of America Special Paper, No, 362, pp. 1-14.GlobalOverview
DS2002-1507
2002
Ebinger, C.J.Sleep, N.H., Ebinger, C.J., Kendall, J.M.Deflection of mantle plume material by cratonic keelsGeological Society of London Special Publication, No. 199, pp. 135-50.MantleGeophysics - seismics, Magmatism
DS2003-0941
2003
Ebinger, C.J.Menzies, M.A., Klemperer, S.L., Ebinger, C.J., Baker, J.Volcanic rifted marginsGeological Society of America Special Paper, No. 362, 470p. $ 80. www.geosociety.org/bookstoreEast Africa, Colorado, Madagascar, Greenland, NamibiaDike swarms, volcanology, Book
DS2003-0942
2003
Ebinger, C.J.Menzies, M.A., Klemperer, S.L., Ebinger, C.J., Baker, J.Characteristics of volcanic rifted marginsGeological Society of America Special Paper, No. 362, chapter 1.GlobalOverview
DS200412-1302
2002
Ebinger, C.J.Menzies, M.A., Klemperer, S.L., Ebinger, C.J., Baker, J.Volcanic rifted margins.Geological Society of America Special Paper, 362, 230p.GlobalBook - volcanism, tectonics
DS200412-1303
2002
Ebinger, C.J.Menzies, M.A., Klemperer, S.L., Ebinger, C.J., Baker, J.Characteristics of volcanic rifted margins.Geological Society of America Special Paper, No, 362, pp. 1-14.TechnologyOverview
DS200612-1571
2006
Ebinger, C.J.Yirgu, G., Ebinger, C.J., Maguire, P.K.H.The Afar volcanic province within the East African Rift sytem.Geological Society of London, Special Publication, No. 259, 336p. $ 200.00Africa, East AfricaMantle plume, paleomagnetism
DS200812-0934
2008
Ebinger, C.J.Ranganai, R.T., Ebinger, C.J.Aeromagnetic and Land sat TM structural interpretation for identifying regional groundwater exploration targets, south central Zimbabwean Craton.Journal of Applied Geophysics, Vol. 65, 2, pp. 73-83.Africa, ZimbabweGeophysics
DS200812-0935
2008
Ebinger, C.J.Ranganai, R.T., Whaler, K.A., Ebinger, C.J.Gravity anomaly patterns in the south central Zimbabwe Archean Craton and their geological interpretation.Journal of African Earth Sciences, Vol. 51, 5, pp. 257-276.Africa, ZimbabweGeophysics - gravity
DS201602-0233
2016
Ebinger, C.J.Ranganai, R.T., Whaler, K.A., Ebinger, C.J.Aeromagnetic interpretation in the south-central Zimbabwe craton: (reappraisal of) crustal structure and tectonic implications.International Journal of Earth Sciences, in press available, 27p.Africa, ZimbabweGeophysics - magnetics

Abstract: Regional aeromagnetic data from the south-central Zimbabwe Craton have been digitally processed and enhanced for geological and structural mapping and tectonic interpretation integrated with gravity data, to constrain previous interpretations based on tentative geologic maps and provide new information to link these structural features to known tectonic events. The derived maps show excellent correlation between magnetic anomalies and the known geology, and extend lithological and structural mapping to the shallow/near subsurface. In particular, they reveal the presence of discrete crustal domains and several previously unrecognised dykes, faults, and ultramafic intrusions, as well as extensions to others. Five regional structural directions (ENE, NNE, NNW, NW, and WNW) are identified and associated with trends of geological units and cross-cutting structures. The magnetic lineament patterns cut across the >2.7 Ga greenstone belts, which are shown by gravity data to be restricted to the uppermost 10 km of the crust. Therefore, the greenstone belts were an integral part of the lithosphere before much of the upper crustal (brittle) deformation occurred. Significantly, the observed magnetic trends have representatives craton-wide, implying that our interpretation and inferences can be applied to the rest of the craton with confidence. Geological-tectonic correlation suggests that the interpreted regional trends are mainly 2.5 Ga (Great Dyke age) and younger, and relate to tectonic events including the reactivation of the Limpopo Belt at 2.0 Ga and the major regional igneous/dyking events at 1.8-2.0 Ga (Mashonaland), 1.1 Ga (Umkondo), and 180 Ma (Karoo). Thus, their origin is here inferred to be inter- and intra-cratonic collisions and block movements involving the Zimbabwe and Kaapvaal Cratons and the Limpopo Belt, and later lithospheric heating and extension associated with the break-up of Gondwana. The movements produced structures, or reactivated older fractures, that were exploited by Late Archaean and Proterozoic mafic intrusions. There was interplay between vertical and horizontal tectonics as seen in similar terrains worldwide.
DS201603-0394
2016
Ebinger, C.J.Lee, H., Muirjead, J.D., Fischer, T.P., Ebinger, C.J., Kattenhorn, S.A., Sharp, Z.D., Kianji, G.Massive and prolonged deep carbon emissions associated with continental rifting.Nature Geoscience, Vol. 9, pp. 145-149.MantleCarbon

Abstract: Carbon from Earth’s interior is thought to be released to the atmosphere mostly via degassing of CO2 from active volcanoes1, 2, 3, 4. CO2 can also escape along faults away from active volcanic centres, but such tectonic degassing is poorly constrained1. Here we use measurements of diffuse soil CO2, combined with carbon isotopic analyses to quantify the flux of CO2 through fault systems away from active volcanoes in the East African Rift system. We find that about 4?Mt?yr-1 of mantle-derived CO2 is released in the Magadi-Natron Basin, at the border between Kenya and Tanzania. Seismicity at depths of 15-30?km implies that extensional faults in this region may penetrate the lower crust. We therefore suggest that CO2 is transferred from upper-mantle or lower-crustal magma bodies along these deep faults. Extrapolation of our measurements to the entire Eastern rift of the rift system implies a CO2 flux on the order of tens of megatonnes per year, comparable to emissions from the entire mid-ocean ridge system2, 3 of 53-97?Mt?yr-1. We conclude that widespread continental rifting and super-continent breakup could produce massive, long-term CO2 emissions and contribute to prolonged greenhouse conditions like those of the Cretaceous.
DS201611-2134
2016
Ebinger, C.J.Ranganai, R.T., Whaler, K.A., Ebinger, C.J.Aeromagnetic interpretation in the south central Zimbabwe Craton: ( reappraisal of) crustal structure and tectonic implications.International Journal of Earth Sciences, Vol. 105, 8, pp. 2175-2201.Africa, ZimbabweGeophysics - gravity

Abstract: Regional aeromagnetic data from the south-central Zimbabwe Craton have been digitally processed and enhanced for geological and structural mapping and tectonic interpretation integrated with gravity data, to constrain previous interpretations based on tentative geologic maps and provide new information to link these structural features to known tectonic events. The derived maps show excellent correlation between magnetic anomalies and the known geology, and extend lithological and structural mapping to the shallow/near subsurface. In particular, they reveal the presence of discrete crustal domains and several previously unrecognised dykes, faults, and ultramafic intrusions, as well as extensions to others. Five regional structural directions (ENE, NNE, NNW, NW, and WNW) are identified and associated with trends of geological units and cross-cutting structures. The magnetic lineament patterns cut across the >2.7 Ga greenstone belts, which are shown by gravity data to be restricted to the uppermost 10 km of the crust. Therefore, the greenstone belts were an integral part of the lithosphere before much of the upper crustal (brittle) deformation occurred. Significantly, the observed magnetic trends have representatives craton-wide, implying that our interpretation and inferences can be applied to the rest of the craton with confidence. Geological-tectonic correlation suggests that the interpreted regional trends are mainly 2.5 Ga (Great Dyke age) and younger, and relate to tectonic events including the reactivation of the Limpopo Belt at 2.0 Ga and the major regional igneous/dyking events at 1.8-2.0 Ga (Mashonaland), 1.1 Ga (Umkondo), and 180 Ma (Karoo). Thus, their origin is here inferred to be inter- and intra-cratonic collisions and block movements involving the Zimbabwe and Kaapvaal Cratons and the Limpopo Belt, and later lithospheric heating and extension associated with the break-up of Gondwana. The movements produced structures, or reactivated older fractures, that were exploited by Late Archaean and Proterozoic mafic intrusions. There was interplay between vertical and horizontal tectonics as seen in similar terrains worldwide.
DS201612-2328
2016
Ebinger, C.J.Ranganai, R.T., Whaler, K.A., Ebinger, C.J.Aeromagnetic interpretation in the south central Zimbabwean Craton: (reappraisal of) crustal structure and tectonic implications.International Journal of Earth Sciences, Vol. 105, 8, pp. 2175-2201.Africa, ZimbabweGeophysics - magnetics

Abstract: Regional aeromagnetic data from the south-central Zimbabwe Craton have been digitally processed and enhanced for geological and structural mapping and tectonic interpretation integrated with gravity data, to constrain previous interpretations based on tentative geologic maps and provide new information to link these structural features to known tectonic events. The derived maps show excellent correlation between magnetic anomalies and the known geology, and extend lithological and structural mapping to the shallow/near subsurface. In particular, they reveal the presence of discrete crustal domains and several previously unrecognised dykes, faults, and ultramafic intrusions, as well as extensions to others. Five regional structural directions (ENE, NNE, NNW, NW, and WNW) are identified and associated with trends of geological units and cross-cutting structures. The magnetic lineament patterns cut across the >2.7 Ga greenstone belts, which are shown by gravity data to be restricted to the uppermost 10 km of the crust. Therefore, the greenstone belts were an integral part of the lithosphere before much of the upper crustal (brittle) deformation occurred. Significantly, the observed magnetic trends have representatives craton-wide, implying that our interpretation and inferences can be applied to the rest of the craton with confidence. Geological-tectonic correlation suggests that the interpreted regional trends are mainly 2.5 Ga (Great Dyke age) and younger, and relate to tectonic events including the reactivation of the Limpopo Belt at 2.0 Ga and the major regional igneous/dyking events at 1.8-2.0 Ga (Mashonaland), 1.1 Ga (Umkondo), and 180 Ma (Karoo). Thus, their origin is here inferred to be inter- and intra-cratonic collisions and block movements involving the Zimbabwe and Kaapvaal Cratons and the Limpopo Belt, and later lithospheric heating and extension associated with the break-up of Gondwana. The movements produced structures, or reactivated older fractures, that were exploited by Late Archaean and Proterozoic mafic intrusions. There was interplay between vertical and horizontal tectonics as seen in similar terrains worldwide.
DS201802-0232
2017
Ebinger, C.J.Ebinger, C.J., Keir, D., Bastow, I.D., Whaler, K., Hammond, J.O.S., Miller, A.A., Tiberi, M.S., Hautot, S.Crustal structure of active deformation zones in Africa: implications for global crustal processes.Tectonics, Vol. 36, 10.1002/2017TC004526Africatectonics

Abstract: The Cenozoic East African rift (EAR), Cameroon Volcanic Line (CVL), and Atlas Mountains formed on the slow-moving African continent, which last experienced orogeny during the Pan-African. We synthesize primarily geophysical data to evaluate the role of magmatism in shaping Africa's crust. In young magmatic rift zones, melt and volatiles migrate from the asthenosphere to gas-rich magma reservoirs at the Moho, altering crustal composition and reducing strength. Within the southernmost Eastern rift, the crust comprises ~20% new magmatic material ponded in the lower crust and intruded as sills and dikes at shallower depths. In the Main Ethiopian Rift, intrusions comprise 30% of the crust below axial zones of dike-dominated extension. In the incipient rupture zones of the Afar rift, magma intrusions fed from crustal magma chambers beneath segment centers create new columns of mafic crust, as along slow-spreading ridges. Our comparisons suggest that transitional crust, including seaward dipping sequences, is created as progressively smaller screens of continental crust are heated and weakened by magma intrusion into 15-20 km thick crust. In the 30 Ma Recent CVL, which lacks a hot spot age progression, extensional forces are small, inhibiting the creation and rise of magma into the crust. In the Atlas orogen, localized magmatism follows the strike of the Atlas Mountains from the Canary Islands hot spot toward the Alboran Sea. CVL and Atlas magmatism has had minimal impact on crustal structure. Our syntheses show that magma and volatiles are migrating from the asthenosphere through the plates, modifying rheology, and contributing significantly to global carbon and water fluxes.
DS201809-2100
2018
Ebinger, C.J.Tepp, G., Ebinger, C.J., Zal, H., Gallacher, R., Accardo, N., Shillington, D.J., Gaherty, J., Keir, D., Nyblade, A.A., Mbogoni, G.J., Chindandali, P.R.N., Ferdinand-Wambura, R., Mulibo, G.D., Kamihanda, G.Seismic anistrotropy of the Upper mantle below the western rfit, East Africa.Journal of Geophysical Research, Vol. 123, 7, pp. 5644-5660.Africa, east Africageophysics - seismic

Abstract: Although the East African rift system formed in cratonic lithosphere above a large-scale mantle upwelling, some sectors have voluminous magmatism, while others have isolated, small-volume eruptive centers. We conduct teleseismic shear wave splitting analyses on data from 5 lake-bottom seismometers and 67 land stations in the Tanganyika-Rukwa-Malawi rift zone, including the Rungwe Volcanic Province (RVP), and from 5 seismometers in the Kivu rift and Virunga Volcanic Province, to evaluate rift-perpendicular strain, rift-parallel melt intrusion, and regional flow models for seismic anisotropy patterns beneath the largely amagmatic Western rift. Observations from 684 SKS and 305 SKKS phases reveal consistent patterns. Within the Malawi rift south of the RVP, fast splitting directions are oriented northeast with average delays of ~1 s. Directions rotate to N-S and NNW north of the volcanic province within the reactivated Mesozoic Rukwa and southern Tanganyika rifts. Delay times are largest (~1.25 s) within the Virunga Volcanic Province. Our work combined with earlier studies shows that SKS-splitting is rift parallel within Western rift magmatic provinces, with a larger percentage of null measurements than in amagmatic areas. The spatial variations in direction and amount of splitting from our results and those of earlier Western rift studies suggest that mantle flow is deflected by the deeply rooted cratons. The resulting flow complexity, and likely stagnation beneath the Rungwe province, may explain the ca. 17 Myr of localized magmatism in the weakly stretched RVP, and it argues against interpretations of a uniform anisotropic layer caused by large-scale asthenospheric flow or passive rifting.
DS201807-1510
2018
Ebmeier, S.K.Magee, C., Stevenson, C.T.E., Ebmeier, S.K., Keir, D., Hammond, J.O.S., Gottsmann, J.H., Whaler, K.A., Schofield, N., Jackson, C.A-L., Petronis, M.S., O'Driscoll, B., Morgan, J., Cruden, A., Vollgger, S.A., Dering, G., Micklethwaite, S., Jackson, M.D.Magma plumbing systems: a geophysical perspective. InSAR, GPS, GNSS, FWI, UAVsJournal of Petrology, in press available, 99p.Mantlemagmatism - geophysics

Abstract: Over the last few decades, significant advances in using geophysical techniques to image the structure of magma plumbing systems have enabled the identification of zones of melt accumulation, crystal mush development, and magma migration. Combining advanced geophysical observations with petrological and geochemical data has arguably revolutionised our understanding of, and afforded exciting new insights into, the development of entire magma plumbing systems. However, divisions between the scales and physical settings over which these geophysical, petrological, and geochemical methods are applied still remain. To characterise some of these differences and promote the benefits of further integration between these methodologies, we provide a review of geophysical techniques and discuss how they can be utilised to provide a structural context for and place physical limits on the chemical evolution of magma plumbing systems. For example, we examine how Interferometric Synthetic Aperture Radar (InSAR), coupled with Global Positioning System (GPS) and Global Navigation Satellite System (GNSS) data, and seismicity may be used to track magma migration in near real-time. We also discuss how seismic imaging, gravimetry, and electromagnetic data can identify contemporary melt zones, magma reservoirs, and, or, crystal mushes. These techniques complement seismic reflection data and rock magnetic analyses that delimit the structure and emplacement of ancient magma plumbing systems. For each of these techniques, with the addition of full-waveform inversion (FWI), the use of Unmanned Aerial Vehicles (UAVs), and the integration of geophysics with numerical modelling, we discuss potential future directions. We show that approaching problems concerning magma plumbing systems from an integrated petrological, geochemical, and geophysical perspective will undoubtedly yield important scientific advances, providing exciting future opportunities for the volcanological community.
DS1989-1367
1989
ebova, A.A.Sekerin, A.P., Menshagin, Yu.V., Lashchenov, V.A., Tverdokh, ebova, A.A.New occurrence of carbonatites and the structural control of alkaline Rocks in the eastern Sayan Province, USSR. (Russian)Izk. Iruktsk. USSR. Izv. Akad. Nauk SSSR, No. 8, pp. 34-41RussiaAlkaline rocks, Carbonatite
DS1985-0623
1985
Ebrahim, N.Smith, C.B., Gurney, J.J., Skinner, E.M.W., Clement, C.R., Ebrahim, N.Geochemical character of Southern African kimberlites: a new approach based on isotopic constraintsTransactions Geological Society of South Africa, Vol. 88, pt. 2, May-August pp. 267-280South AfricaGeochemistry, Geochronology
DS1970-0700
1973
Ebrahim, S.Gurney, J.J., Ebrahim, S.Chemical Composition of Lesotho KimberlitesMaseru: Lesotho Nat. Dev. Corp. Lesotho Kimberlites Editor N, PP. 280-284.Lesotho, South Africa, RussiaGeochemistry
DS201312-0237
2013
E-BriefsE-BriefsCVD synthetic diamond with aggregated nitrogen impurities.G & G Brief, 1/2p.TechnologySynthetic diamonds
DS1986-0294
1986
Eby, G.M.Gold, D.P., Eby, G.M., Vallee, M.Carbonatites, diatremes and ultra alakaline rocks in the Okaarea, QuebecGeological Association of Canada (GAC) Field trip Guidebook, No. 21, 51pQuebecMonteregian, Aillikite, alnoite, okaite, carbonatite, ijolit, Melilite, glimmerite, Ile C.
DS1975-1002
1979
Eby, G.N.Eby, G.N.Trace Element Geochemistry and Petrogenesis of Mount Saint Bruno.Geological Society of America (GSA), Vol. 11, No. 1, P. 11. (abstract.).Canada, QuebecRelated Rocks
DS1983-0210
1983
Eby, G.N.Eby, G.N.Geology, Geochemistry and Petrogenesis of the Montregian Hills, Alkaline Province, Quebec.Geological Society of America (GSA), Vol. 15, No. 6, P. 565. (abstract.).Canada, QuebecRelated Rocks, Genesis
DS1984-0251
1984
Eby, G.N.Eby, G.N.Age, Geochemistry and Petrogenesis of Lamprophyre Dikes From the Montregian Hills and Younger White Mountain Igneous Provinces.Geological Society of America (GSA), Vol. 16, No. 1, P. 14. (abstract.).Canada, QuebecGeochronology, Alnoite, Kimberlite, Fourchite, Monchiquite, Camp
DS1984-0252
1984
Eby, G.N.Eby, G.N.Montregian Hills I. Petrography, Major and Trace Element Chemistry, and Strontium Isotopic Chemistry of the Western Intrusions, Mounts Royal, St. Bruno and Johnson.Journal of PETROLOGY, IN PRESSCanada, QuebecBlank
DS1984-0253
1984
Eby, G.N.Eby, G.N.Geochronology of the Montregian Hills Alkaline Igneous Province, Quebec.Geology, Vol. 12, No. 8, PP. 468-470.Canada, QuebecBlank
DS1985-0164
1985
Eby, G.N.Eby, G.N.Mafic Alkaline Rocks of the Montregian Hills, QuebecGeological Association of Canada (GAC)., Vol. 10, P. A 15, (abstract.).Canada, QuebecRare Earth Elements (ree), Geochemistry
DS1985-0165
1985
Eby, G.N.Eby, G.N.Strontium and Lead Isotopes, Uranium and Thorium Chemistry of the alkaline Montregian and White Mountain Igneous Provinces Eastern North America.Geochimica et Cosmochimica Acta ., Vol. 49, No. 5, MAY PP. 1143-1154.Canada, United States, Quebec, Appalachia, Vermont, New YorkGeochronology
DS1985-0166
1985
Eby, G.N.Eby, G.N.Age relations, chemistry and petrogenesis of mafic alkaline dikes from Montregian Hills and White Mtn.Canadian Journal of Earth Sciences, Vol. 22, pp. 1103-11.QuebecCamptonites, Monchiquites, Basanites, Montregian Hills, White Mountain
DS1985-0167
1985
Eby, G.N.Eby, G.N.The Montregian Hills and White Mountain Alkaline Igneous Provinces, Eastern North America.Conference Report of The Meeting of The Volcanic Studies Gro, 1P. ABSTRACT.United States, Appalachia, Canada, QuebecGeochronology, Petrogenesis
DS1986-0161
1986
Eby, G.N.Currie, K.L., Eby, G.N., Gittins, J.The petrology of the Mont Saint Hilaire complex, southernQuebec: an alkaline gabbro peralkaline syenite associationLithos, Vol. 19, No. 1, pp. 65-81QuebecAlkaline rocks
DS1986-0204
1986
Eby, G.N.Eby, G.N., Mariano, A.N.Geology and geochronology of carbonatites peripheral to the Parana Brasil-ParaguayGeological Association of Canada (GAC) Annual Meeting, Vol. 11, p. 66, (abstract.)Brazil, Paraguay, South AmericaCarbonatite
DS1987-0175
1987
Eby, G.N.Eby, G.N.The Monteregian Hills and White Mountain alkaline igneousprovinces, eastern North Americain: Fitton and Upton, Alkaline igneous rocks, Blackwell publ, pp. 433-448GlobalBlank
DS1988-0186
1988
Eby, G.N.Eby, G.N.Petrology, geochemistry and isotope geology of Mount Yamaska, Montregergian Hills, petrographic province, QuebecGeological Society of America abstract Volume, Vol. 20, No. 1, January p. 16-17. Portland MaineQuebecCarbonatite
DS1989-0388
1989
Eby, G.N.Eby, G.N.Petrology and geochemistry of Mount Yamaska, Quebec,Canada: a mafic representative of the Montregian Hills igneous provinceGeological Society of India, Memoir, Editor C. LeelanandaM., No. 15, pp. 63-82QuebecLherzolite/basanite, Mantle
DS1990-0438
1990
Eby, G.N.Eby, G.N.The A-type granitoids: a review of their occurrence and chemical characteristics and speculations on their petrogenesisLithos, Special Issue, Vol. 25, No. 4, pp. 115-134GlobalGranitoids, Geochemistry
DS1992-0408
1992
Eby, G.N.Eby, G.N., Mariano, A.N.Geology and geochronology of carbonatites and associated alkaline rocks peripheral to the Parana Basin, Brasil-ParaguayJournal of South American Earth Sciences, Vol. 6, No. 3, October pp. 207-216Brazil, ParaguayCarbonatite, Geochronology
DS1994-0480
1994
Eby, G.N.Eby, G.N., Maher, S.G., Poland, L.J.Petrology and geochemistry of the Beemerville nepheline syenite complex, northern New Jersey, USAGeological Association of Canada (GAC) Abstract Volume, Vol. 19, p. posterGlobalAlkaline rocks, Beemerville
DS1994-1217
1994
Eby, G.N.Mitchell, R.H., Eby, G.N.Alkaline rock symposiuMGeological Association of Canada (GAC)/Mineralogical Association of Canada (MAC) Meeting Waterloo Ontario, May 12-14, 1994OntarioField excursion 1994, Coldwell Complex, carbonatite
DS1994-1952
1994
Eby, G.N.Woolley, A.R., Eby, G.N., Platt, R.G.The North Nyasas alkaline province, MalawiGeological Association of Canada (GAC) Abstract Volume, Vol. 19, p.MalawiAlkaline rocks, North Nyasas
DS1995-0477
1995
Eby, G.N.Eby, G.N., Roden-Tice, M., et al.Geochronology and cooling history of the northern part of the Chilwaalkaline Province Malawi.Journal of African Earth Sciences, Vol. 20, No. 3-4, pp. 275-288.MalawiAlkaline rocks, Chilwa Alkaline Province
DS1996-1560
1996
Eby, G.N.Woolley, A.R., Platt, R.G., Eby, G.N.Relatively aluminous alkali pyroxene in nepheline syenites from Malawi:mineralogical response...Canadian Mineralogist, Vol. 34, pt. 2, April pp. 423-434.MalawiAlkaline rocks, metamorphism
DS1998-1558
1998
Eby, G.N.Waight, T.E., Weaver, S.D., Maas, R., Eby, G.N.French Creek granite and Hohanu Dyke swarm: Late Cretaceous alkaline magmatism and opening of Tasman SeaAustralian Journal of Earth Sciences, Vol. 45, No. 6, Dec. pp. 823-36.GlobalAlkaline rocks
DS2002-0963
2002
Eby, G.N.Lloyd, F.E., Woolley, F., Stoppa, G., Eby, G.N.Phlogopite biotite parageneses from K mafic carbonatite effusive magmatic association of Katwe Kikorongo.Mineralogy and Petrology, Vol. 74, 2-4, pp. 299-322.UgandaCarbonatite, Deposit - Katwe Kikorongo
DS200912-0191
2008
Eby, G.N.Duke, G.I., Carlson, R.W., Eby, G.N.Two distinct sets of magma sources in Cretaceous rocks from Magnet Cove, Prairie Creek, and other igneous centres of the Arkansas Alkaline Province, USA.American Geological Union, Fall meeting Dec. 15-19, Eos Trans. Vol. 89, no. 53, meeting supplement, 1p. abstractUnited States, ArkansasLamproite
DS200912-0198
2009
Eby, G.N.Eby, G.N., Vasconcelos, P.Geochronology of the Arkansas alkaline province of southeastern United States.Journal of Geology, Vol. 117, Sept. pp. 615-626.United States, ArkansasCarbonatite, lamproites
DS201012-0178
2009
Eby, G.N.Eby, G.N., Llyod, F.E., Woolley, A.R.Geochemistry and petrogenesis of the Fort Portal, Uganda, extrusive carbonatite.Lithos, Vol. 113, pp. 785-800.Africa, UgandaCarbonatite
DS201412-0213
2014
Eby, G.N.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
DS201412-0545
2014
Eby, G.N.Mangler, M.F., Marks, M.A.W., Zaitsev, A.N., Eby, G.N., Markl, G.Halogens (F, Cl and Br) at Oldoinyo Lengai volcano ( Tanzania): effects of magmatic differentiation, silicate, natrocarbonatite melt seperation and surface alteration of natrocarbonatite.Chemical Geology, Vol. 365, pp. 43-53.Africa, TanzaniaCarbonatite
DS2000-0934
2000
Eby, N.Stoppa, F., Woolley, A.R., Lloyd, F.E., Eby, N.Carbonatite lapilli bearing tuff and a dolomite carbonatite bomb from Murumuli crater, Katwe volcanic.Mineralogical Magazine, Vol. 64, No. 4, Aug. pp. 641-50.UgandaCarbonatite
DS200512-0055
2005
Eby, N.Bailey, K., Lloyd, F., Kearns, S., Stoppa, F., Eby, N., Woolley, A.Melilitite at Fort Portal, Uganda: another dimension to the carbonate volcanism.Lithos, Advanced in press,Africa, UgandaCalciocarbonatite lavas
DS200612-0075
2005
Eby, N.Bailey, K., Lloyd, F., Kearns, S., Stoppa, F., Eby, N., Woolley, A.Melilitite at Fort Portal, Uganda: another dimension to the carbonate volcanism.Lithos, Vol. 85, 1-4, Nov-Dec. pp. 15-25.Africa, UgandaCarbonatite, volcanism
DS1998-0378
1998
Eccles, D.Eccles, D., Lywood, P., Dufresne, M.B.Diamond and metallic mineral potential of the Kakwa Wapiti areaCalgary Mining Forum, Apr. 8-9, p. 59. poster abstractAlbertaGeochemistry - Heavy minerals
DS1998-0371
1998
Eccles, D.R.Dufresne, M.B., Olsen, R.A., Eccles, D.R., Fenton, et al.Alberta diamonds - an update on the newly emerging diamondiferous kimberlite field in western Canada. #2Calgary Mining Forum, Apr. 8-9, p. 21-3. abstractAlbertaRegional geology, History
DS1998-0379
1998
Eccles, D.R.Eccles, D.R.Enzyme leach based soil geochemistry of the Mountain Lake diatreme, Alberta.Alberta Open file, 1998-01, Feb. 16AlbertaGeochemistry, Deposit - Mountain Lake diatreme
DS1998-1132
1998
Eccles, D.R.Pawlowicz, J.G., Eccles, D.R., Fenton, Andriashek, ChowOverview of the Kakwa/Wapiti Study (Map Sheet 83L): implications for diamond exploration.Calgary Mining Forum, Apr. 8-9, p. 43. abstractAlbertaGeology - sampling
DS1999-0189
1999
Eccles, D.R.Eccles, D.R.Enzyme leach based soil geochemistry and biogeochemistry survey over the Mountain Lake diatreme8th. Calgary Mining forum, 2p. abstractAlbertaBiogeochemistry, Deposit - Mountain Lake
DS2000-0248
2000
Eccles, D.R.Dufresne, M.B., Eccles, D.R.Diamond indicator minerals and trends in northern AlbertaGeological Association of Canada (GAC)/Mineralogical Association of Canada (MAC) Calgary May 2000, 1p.AlbertaSampling - indicator minerals, brief - history
DS2000-0259
2000
Eccles, D.R.Eccles, D.R., Grunsky, E.C., Grobe, M., Weiss, J.Structural emplacement model for kimberlitic diatremes in northern AlbertaAlberta Energy and Utilities Board and Alberta Geological Survey, Report, 116p.AlbertaStructure - model
DS2000-0260
2000
Eccles, D.R.Eccles, D.R., Grunsky, E.C., Grobe, M., Weiss, J.Structural emplacement model for kimberlitic diatremes in AlbertaGeological Association of Canada (GAC)/Mineralogical Association of Canada (MAC) Calgary May 2000, 1p.AlbertaStructure -, Deposit - Buffalo Hills area
DS2000-0261
2000
Eccles, D.R.Eccles, D.R., Grunsky, E.G., Grobe, M., Weiss, J.Structural emplacement model for kimberlitic diatremes in northern Alberta28th. Yellowknife Geoscience Forum, p. 22-24.abstractAlbertaStructure, Buffalo Hills area
DS2001-0287
2001
Eccles, D.R.Eccles, D.R., Dufresne, M., Copeland, D., Csanyi, W., Creighton, S.Alberta kimberlite indicator mineral geochemical compilationAlberta Geological Survey, www.ags.gov.ab.ca, ESR 01-20, $ 20.AlbertaGeochemistry - database
DS2001-0288
2001
Eccles, D.R.Eccles, D.R., Haynes, M., Csanyi, W.Diamond and metallic mineral potential of Peerless Lake map areaAlberta Geological Survey, www.ags.gov.ab.ca, ESR 00-08, 12.8 MB $ 20.AlbertaGeology - Peerless Lake
DS2002-0415
2002
Eccles, D.R.Eccles, D.R.Enzyme leach based soil geochemistry of the Mountain Lake diatreme, AlbertaCanadian Institute of Mining and Metallurgy, Vol. 53, Industrial Minerals of Canada, pp. 355-60.AlbertaHistory - exploration geochemistry
DS2002-0416
2002
Eccles, D.R.Eccles, D.R.Alberta kimberlite: a comparison to kimberlite and ultramafic occurrences worldwideGac/mac Annual Meeting, Saskatoon, Abstract Volume, P.32., p.32.AlbertaMountain Lake, Buffalo Head Hills, Birch Mountains, Geochemistry
DS2002-0417
2002
Eccles, D.R.Eccles, D.R.Alberta kimberlite: a comparison to kimberlite and ultramafic occurrences worldwideGac/mac Annual Meeting, Saskatoon, Abstract Volume, P.32., p.32.AlbertaMountain Lake, Buffalo Head Hills, Birch Mountains, Geochemistry
DS2003-0301
2003
Eccles, D.R.Creighton, S.D., Eccles, D.R.A preliminary study of the mineral chemistry of selected Alberta kimberlites8 Ikc Www.venuewest.com/8ikc/program.htm, Session 7, POSTER abstractAlbertaBlank
DS2003-0363
2003
Eccles, D.R.Eccles, D.R.The northern Alberta kimberlite province: Geological overview and exploration updateQuebec Exploration 2003, diamond session, extended abstract, 1 pageAlbertaMountain Lake, Buffalo Head Hills, Birch Mountains kimberlite clusters
DS2003-0364
2003
Eccles, D.R.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
DS2003-0365
2003
Eccles, D.R.Eccles, D.R., Pana, D.I., Paulen, R.C., Olson, R.A., Magee, D.Discovery and geological setting of the northern Alberta kimberlite provinceIn: 8th. International Kimberlite Conference Slave Province And Northern Alberta, pp. 1-10.AlbertaGeology
DS200412-0388
2003
Eccles, D.R.Creighton, S.D., Eccles, D.R.A preliminary study of the mineral chemistry of selected Alberta kimberlites.8 IKC Program, Session 7, POSTER abstractCanada, AlbertaKimberlite petrogenesis
DS200412-0500
2003
Eccles, D.R.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
DS200412-0501
2003
Eccles, D.R.Eccles, D.R., Pana, D.I., Paulen, R.C., Olson, R.A., Magee, D.Discovery and geological setting of the northern Alberta kimberlite province.8th. International Kimberlite Conference Slave Province and Northern Alberta Field Trip Guidebook, pp. 1-10.Canada, AlbertaGeology
DS200612-1010
2006
Eccles, D.R.Olson, R., Eccles, D.R., Pana, D., Edwards, D., Beaton,A., Maslowski, A.Summary of mineral exploration during 2005, Diamondiferous kimberlites ( 2p.)Alberta Geological Survey, Jan. 20, 2p.Canada, AlbertaNews item - exploration activity
DS200712-0284
2006
Eccles, D.R.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
DS200812-0311
2008
Eccles, D.R.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
Eccles, D.R.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
DS200912-0199
2008
Eccles, D.R.Eccles, D.R.Alberta: driven by diamonds, propelled by potash.Canadian Institute of Mining and Metallurgy Magazine, Vol. 3, no. 8, pp. 68-69.Canada, AlbertaBrief overview
DS200912-0414
2009
Eccles, D.R.Kravchinsky, V.A., Eccles, D.R., Zhang, R., Cannon, M.Paleomagnetic dating of the northern Alberta kimberlites. K5, K6Canadian Journal of Earth Sciences, Vol. 46, pp. 231-245.Canada, AlbertaDeposit - Buffalo Head Hills - geochronology
DS201012-0179
2010
Eccles, D.R.Eccles, D.R., Read, G.Kimberlites and related rocks in the Western Canadian Sedimentary Basin. SHORT COURSE GAC MAY 14.GAC Short Course, Registration geocanada2010.caCanada, AlbertaShort Course
DS201012-0180
2010
Eccles, D.R.Eccles, D.R., Simonetti, S.S., Cox, R.Garnet pyroxenite and granulite xenoliths from northeastern Alberta: evidence of not vertical similarity 1.5 Ga lower crust and mantle w. LaurentiaPrecambrian Research, Vol. 177, 3-4, pp. 339-354.Canada, AlbertaXenoliths
DS201212-0181
2011
Eccles, D.R.Eccles, D.R.Northern Alberta kimberlite province: the first 20 years.Alberta Geological Survey, Bull. 65, 119p.Canada, AlbertaHistory - diamond exploration
DS200712-0167
2007
Eccles, J.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
DS2001-0289
2001
Eccles, R.Eccles, R., Grunsky, E.Alteration mineralogy of Alberta kimberlites. PIMA infrared spectroscopic analysisAlberta Geological Survey, www.ags.gov.ab.ca, SPE 12, $ 20.AlbertaMineralogy, Spectroscopy
DS2002-1185
2002
Eccles, R.Olson, R.A., Eccles, R., Berezniuk, T.Diamonds claim lion's share of exploration dollarsProspectors and Developers Association of Canada (PDAC) Exploration and Development Highlights, p.25-6.AlbertaNews item - brief review
DS2003-0366
2003
Eccles, R.Eccles, R.The northern Alberta kimberlite province: geological overview and exploration updateQuebec Exploration Conference, Nov. 25-27, 1p. abstractAlbertaOverview - Mountain Lake, Ashton, Kennecott, Montello
DS2003-0367
2003
Eccles, R.Eccles, R., Olson, R., Magee, D.Mineral trains, but no gravy train as diamond hunt continuesPdac Exploration And Development Highlights, March, pp. 24-5.AlbertaNews item, Overview
DS2003-0368
2003
Eccles, R.Eccles, R., Olson, R.A., Magee, D.Mineral trains, but no gravy train as diamond hunt continuesExploration and Development Highlights, March 2003, p. 24-25Albertaexploration activity
DS200412-0502
2003
Eccles, R.Eccles, R.The northern Alberta kimberlite province: geological overview and exploration update.Quebec Exploration Conference, Nov. 25-27, 1p. abstractCanada, AlbertaOverview - Mountain Lake, Ashton, Kennecott, Montello
DS201907-1531
2019
Ecclestone, C.Ecclestone, C.Rare Earths .. Sunset for China's REE dominance.Hallgartenco.com, June 5, 21p. PdfChinaREE
DS2003-1368
2003
EchevestsTeixeira, W., Pinese, J.P.P., Iacumin, V.V., Girardi, Piccirillo, Echevests, RibotCalc alkaline and tholeiitic dyke swarms of Tandilia, Rio de la Plat a Craton, Argentina:Precambrian Research, Vol. 119, 1-4, Dec. 20, pp. 329-353.ArgentinaTrans Amazonian Orogeny
DS1998-0710
1998
Echtler, et al.Juhlin, C., Friberg, M., Echtler, et al.Crustal structure of the Middle Urals: results from the ESRU Europrobe seismic reflection profiling in Urals...Tectonics, Vol. 17, No. 5, Oct. pp. 710-725.Russia, UralsGeophysics - seismics, East European Craton, tectonics
DS1996-0406
1996
Echtler, H.P.Echtler, H.P., et al.Preserved collisional crustal structure of the southern Urals revealed by vibroseis profiling.Science, Vol. 274, No. 5285, Oct. 11, pp. 224-225.Russia, UralsGeodynamics, Geophysics -seismics
DS200612-0745
2006
Eckardt, V.Krienitz, M.S., Haase, K.M., Mezger, K., Eckardt, V., Shaikh Mashail, M.A.Magma genesis and crustal contamination of continental intraplate lavas in northwestern Syria.Contributions to Mineralogy and Petrology, Vol. 151, 6, pp. 698-716.Africa, SyriaMagmatism - not specific to diamonds
DS201412-0367
2014
Eckelmann, K.Hofmann, M., Linnemann, U., Hoffmann, K-H., Gerdes, A., Eckelmann, K., Gartner, A.The Namuskluft and Dreigratberg sections in southern Namibia ( Kalahari Craton, Gariep Belt): a geological history of Neoproterozoic rifting and recycling of cratonic crust during the dispersal of Rodinia until the amalgamation of Gondwana.International Journal of Earth Sciences, Vol. 103, pp. 1187-1202.Africa, NamibiaGeochronology
DS1950-0100
1952
Eckermann, H. VonEckermann, H. Von, Ubisch, Wickman, F.E.A Preliminary Investigation Into the Isotopic Composition Of Carbon from Some Alkaline Intrusions.Geochimica Et Cosmochimica Acta, Vol. 2, PP. 207-210.Sweden, ScandinaviaAlnoite, Isotope Chemistry
DS1950-0270
1956
Eckermann, H. VonEckermann, H. Von , Wickman, F.E.A Priliminary Determination of the Maximum Age of the Alno Rocks.Geol. Foren. Forhandl., Vol. 78, PP. 122-124.Norway, ScandinaviaUltramafic And Related Rocks, Geochronology
DS1920-0380
1928
Eckermann, H. Von.Eckermann, H. Von.Dikes Belonging to the Alno Formation in the Cuttings of The East Coast Railway.Geol. Foren. Forhandl., Vol. 50, PP. 381-412.Norway, ScandinaviaAlnoite
DS1920-0381
1928
Eckermann, H. Von.Eckermann, H. Von.A Preliminary Examination of the Profile of the Country Rocks Along the Southern Norrland, Sweden, As Observed in the Cuttings of the East Coast Railway.Medd. Stockholms Hogsk. Min. Institute, No. 58, PP. 309-367.Sweden, ScandinaviaRelated Rocks
DS1930-0296
1939
Eckermann, H. Von.Eckermann, H. Von.De Alaklin a Bergarternas Genesis I Belysning Av Nya Forskningsron Fran Alnon.Geol. Foren. Forhandl., Vol. 61, PP. 142-151.Norway, ScandinaviaUltramafic And Related Rocks
DS1940-0045
1942
Eckermann, H. Von.Eckermann, H. Von.Ett Prelimin art Meddelande Om Mye Forskminsron Irom Alno Alakalin a Omrade.Geol. Foren. Forhandl., Vol. 64, PP. 399-455.Sweden, ScandinaviaAlnoite, Carbonatite, Mineralogy, Petrology
DS1940-0094
1945
Eckermann, H. Von.Eckermann, H. Von.Contributions to the Knowledge of the Jotnian Rocks of the Nordingrarodo Region. Iv-x.Geol. Foren. Forhandl., Vol. 67.Scandinavia, SwedenAlnoite
DS1940-0112
1946
Eckermann, H. Von.Eckermann, H. Von.Alno Alkalin a Intrusions teknik Och Genesis I Belysning Av Dess Gangbergarter.Geol. Foren. Forhandl., Vol. 68, PP. 115-119.Norway, ScandinaviaUltramafic And Related Rocks
DS1940-0171
1948
Eckermann, H. Von.Eckermann, H. Von.The Process of NephelinizationInternational Geological Congress 18TH., SESSION., PT. 3, PP. 90-93.ScandinaviaUltramafic And Related Rocks
DS1940-0172
1948
Eckermann, H. Von.Eckermann, H. Von.The Genesis of Alno Alkaline RocksInternational Geological Congress 18TH. SESSION., PT. 3, PP. 94-101.Scandinavia, NorwayUltramafic And Related Rocks
DS1940-0173
1948
Eckermann, H. Von.Eckermann, H. Von.The Alkaline District of Alno IslandSveriges Geol. Undersokn, Arsbok, SER. C, AVHANDL. UPPSAT., No. 36, 176P.Sweden, ScandinaviaAlnoite, Kimberlite, Mineralogy, Petrology, Carbonatite
DS1950-0022
1950
Eckermann, H. Von.Eckermann, H. Von.A Comparison of Fennoscandian Limestone Contact Minerals And Those of the Alno Alkaline Rocks, Associated with Carbonates.Mineralogical Magazine., Vol. 29, PP. No. 211, DECEMBER PP. 304-312.Norway, ScandinaviaAlnoite, Ultramafic And Related Rocks
DS1950-0063
1951
Eckermann, H. Von.Eckermann, H. Von.The Distribution of Barium and Strontium in the Rocks and Minerals of the Syenitic and Alkaline Rocks of Alno Island.Arkiv f÷r Mineralogi och Geologi, Vol. 1, No. 13, PP. 367-375.Norway, ScandinaviaUltramafic And Related Rocks
DS1950-0384
1958
Eckermann, H. Von.Eckermann, H. Von.The Alkaline and Carbonatitic Dikes of the Alno Formation On the MaIn land Northwest of Alno Island.Kungl. Svenska Vetenskap. Akad. Handl., 4TH. SER. Vol. 7, No. 2, 61P.Sweden, ScandinaviaAlnoite, Carbonatite, Petrology
DS1960-0037
1960
Eckermann, H. Von.Eckermann, H. Von.The Alno Alkaline RegionInternational Geological Congress 21ST. SESSION., EXCURSION C27, PP. 18-25.Norway, ScandinaviaUltramafic And Related Rocks
DS1960-0038
1960
Eckermann, H. Von.Eckermann, H. Von.Borengite. a New Ultra Potassic Rock from Alno IslandArkiv f÷r Mineralogi och Geologi, Vol. 2, PP. 519-528.Norway, ScandinaviaUltramafic And Related Rocks
DS1960-0039
1960
Eckermann, H. Von.Eckermann, H. Von.Boulders of Volcanic Breccia at the Salskar Shoals North Ofalno Island.Arkiv f÷r Mineralogi och Geologi, Vol. 2, PP. 529-537.Norway, ScandinaviaUltramafic And Related Rocks
DS1960-0040
1960
Eckermann, H. Von.Eckermann, H. Von.Contributions to the Knowledge of the Alkaline Dikes of Thealno Region, Pt. I-iii.Arkiv f÷r Mineralogi och Geologi, Vol. 2, PP. 539-550.Norway, ScandinaviaUltramafic And Related Rocks
DS1960-0140
1961
Eckermann, H. Von.Eckermann, H. Von.The Composition of the Alno Alkaline Dikes by Percolating Water.Comptes Rendus Geol. De la Soc. De Finlande., Vol. 33, PP. 244-254.GlobalAlnoite
DS1960-0141
1961
Eckermann, H. Von.Eckermann, H. Von.Contributions to the Knowledge of the Alkaline Dikes of Thealno Region. #1Arkiv f÷r Mineralogi och Geologi, Vol. 3, PP. 65-68.Norway, ScandinaviaUltramafic And Related Rocks
DS1960-0142
1961
Eckermann, H. Von.Eckermann, H. Von.The Petrogenesis of the Alno Alkaline RocksGeol. Ins. Uppsala Bulletin., Vol. 40, PP. 25-36.Sweden, ScandinaviaPetrography, Alnoite
DS1960-0335
1963
Eckermann, H. Von.Eckermann, H. Von.Contributions to the Knowledge of the Alkaline Dikes of Thealno Region, V-viii.Arkiv f÷r Mineralogi och Geologi, Vol. 3, No. 12, PP. 259-275.Sweden, ScandinaviaAlnoite
DS1960-0336
1963
Eckermann, H. Von.Eckermann, H. Von.Contributions to the Knowledge of the Alkaline Dikes of Thealno Region Ix.Arkiv f÷r Mineralogi och Geologi, Vol. 3, No. 19, PP. 397-402.Sweden, ScandinaviaAlnoite
DS1960-0443
1964
Eckermann, H. Von.Eckermann, H. Von.The Swedish Kimberlites and a Comparison with South Africanand Russian Rocks #1Indian Geophysical Union (hyderabadm), Advancing Frontiers In G, PP. 269-278.South Africa, Russia, Sweden, ScandinaviaKimberlite, Geophysics
DS1960-0444
1964
Eckermann, H. Von.Eckermann, H. Von.Distribution of Radioactivity in Minerals and Rocks of the Alno Alkaline Area.Arkiv f÷r Mineralogi och Geologi, Vol. 3, No. 27Sweden, ScandinaviaAlnoite
DS1960-0445
1964
Eckermann, H. Von.Eckermann, H. Von.Contribution to the Knowledge of the Alkaline Dikes of the Alno Region Xi-xii.Arkiv f÷r Mineralogi och Geologi, Vol. 3, No. 29Sweden, ScandinaviaAlnoite
DS1960-0446
1964
Eckermann, H. Von.Eckermann, H. Von.The Swedish Kimberlites and a Comparison with South Africanand Russian Rocks #2Geologii i Geofiziki, No. 6Sweden, South Africa, Russia, ScandinaviaClassification
DS1960-0657
1966
Eckermann, H. Von.Eckermann, H. Von.The Pyroxenes of the Alno Carbonatite (sovite) and of the Surrounding Fenites.Mineralogical Society of India Ima Volume., Norway, ScandinaviaAlnoite
DS1960-0658
1966
Eckermann, H. Von.Eckermann, H. Von.The Age Relationships between the Alnoite Dikes at Alno And the Sovite Pegmatites, and the Possibility of Occurrence Of inflammable Gas Beneath the Alkaline Diatremes.Arkiv f÷r Mineralogi och Geologi, Vol. 4, No. 12, PP. 369-375.Sweden, ScandinaviaAlnoite
DS1960-0659
1966
Eckermann, H. Von.Eckermann, H. Von.Progress of Research on the Alno CarbonatiteWiley Interscience., PP. 3-31.Scandinavia, SwedenCarbonatite, Mineralogy, Petrology
DS1960-0822
1967
Eckermann, H. Von.Eckermann, H. Von.A Comparison of Swedish, African and Russian KimberlitesWiley Interscience., PP. 302-312.South Africa, Sweden, Russia, ScandinaviaKimberlite, Alnoite
DS1970-0902
1974
Eckermann, H. Von.Eckermann, H. Von.The Chemistry and Optical Properties of Some Minerals of The Alno Alkaline Rocks.Arkiv f÷r Mineralogi och Geologi, Vol. 5, No. 8, PP. 93-210.Sweden, ScandinaviaAlnoite, Kimberlite, Mineral Chemistry
DS1991-1697
1991
Eckert, J.O.Taylor, L.A., Eckert, J.O., Neal, C.R., Crozaz, G.Crustal signatures in mantle eclogites: rare earth elements (REE) patterns of clinopyroxene and garnet by SIMS and INAA.Proceedings of Fifth International Kimberlite Conference held Araxa June 1991, Servico Geologico do Brasil (CPRM) Special, pp. 410-413South AfricaBellsbank, geochemistry, Eu anomaly, rare earth elements (REE).
DS201112-0022
2011
Eckert, J.O.Jr.Andrews, A.L., Wang, Z.R., Bolton, E.W., Eckert, J.O.Jr.The effect of diffusion on P-T conditions inferred by cation-exchange thermobarometry.Goldschmidt Conference 2011, abstract p.441.Africa, South AfricaKappvaal Craton, Kimberley
DS1990-0439
1990
Eckert Jr. J.C.Eckert Jr. J.C., Taylor, L.A., Neal, C.R.Major and trace element chemistry of exsolved garnet and host clinopyroxene in mantle eclogiteEos, Vol. 71, No. 43, October 23, p. 1708 AbstractSouth AfricaEclogite, Geochemistry
DS2003-1497
2003
Eckhardt, F.D.Wormald, R.J., Eckhardt, F.D., Vearncombe, J., Vearncombe, S.Spatial distribution analysis of pans in Botswana: the importance of structural controlSouth Africa Jnournal of Geology, BotswanaBlank
DS200412-2144
2003
Eckhardt, F.D.Wormald, R.J., Eckhardt, F.D., Vearncombe, J., Vearncombe, S.Spatial distribution analysis of pans in Botswana: the importance of structural control.South African Journal of Geology, Vol. 106, 4, 287-290.Africa, BotswanaStructure, geomorphology
DS1995-0478
1995
Eckstrand, O.R.Eckstrand, O.R., Sinclair, W.D., Thorpe, R.I.Geology of Canadian mineral deposit typesGeological Survey of Canada Geology of Canada, No. 8, 650p. $ 70.00 or $ 91.00. plus postageCanadaMineral deposits, Table of contents
DS1993-0358
1993
Eckstrom, G.Dmowska, R., Eckstrom, G.Shallow subduction zonesSpringer Verlag, Reprint from Pure and Applied Geophysics, 220p. approx. $ 60.00GlobalBook -ad, Tectonics, subductions zones
DS1991-0418
1991
Economic GeologyEconomic GeologyA special issue on applications of hydrothermal alteration studies to mineral explorationEconomic Geology, Vol. 86, No. 3, May 1991, pp. 461-689United States, CanadaMineral deposits, Economic Geology, Hydrothermal alteration
DS1994-0481
1994
Economic GeologyEconomic GeologyVolcanic centers as targets for mineral exploration. Special IssueEconomic Geology, Vol. 89, No. 8Iran, Mexico, New Mexico, Colorado, Montana, IdahoMetallogeny, gold, silver, Volcanic centers
DS1995-0479
1995
Economic GeologyEconomic GeologyApplication of microanalytical techniques to economic geologyEconomic Geology, Vol. 90, No. 2, March-April, pp. 227-307GlobalMicroanalytical techniques, SHRIMP studies
DS200712-0285
2007
Economic GeologyEconomic GeologyCompilation series volume 1: diamonds and kimberlites 1905-2007. CD Rom of articles and Anniversary volumes, guidebook 26 (Field trip to Cripple Creek, Kelsey Lakestore.agiweb.org, List $ 70 and $ 56.00 membersTechnologyCD compilation reference
DS1989-0389
1989
Economic TimesEconomic TimesMove to rope in French firm for diamond huntIndiaqua, No. 52, 1989/I. p. 43IndiaNews item, France
DS201808-1742
2018
Edahbi, M.Edahbi, M., Plante, B., Benzaazoua, M., Kormos, L., Pelletier, M.Rare earth elements ( La, Ce, Pr, Nd, and Sm) from a carbonatite deposit: mineralogical characterization and geochemical behavior. MontvielMinerals, Vol. 8, pp. 55-74.Canada, Quebeccarbonatite

Abstract: Geochemical characterization including mineralogical measurements and kinetic testing was completed on samples from the Montviel carbonatite deposit, located in Quebec (Canada). Three main lithological units representing both waste and ore grades were sampled from drill core. A rare earth element (REE) concentrate was produced through a combination of gravity and magnetic separation. All samples were characterized using different mineralogical techniques (i.e., quantitative evaluation of minerals by scanning electron microscopy (QEMSCAN), X-ray diffraction (XRD), and scanning electron microscopy with X-ray microanalysis (SEM-EDS)) in order to quantify modal mineralogy, liberation, REE deportment and composition of REE-bearing phases. The REE concentrate was then submitted for kinetic testing (weathering cell) in order to investigate the REE leaching potential. The mineralogical results indicate that: (i) the main REE-bearing minerals in all samples are burbankite, kukharenkoite-Ce, monazite, and apatite; (ii) the samples are dominated by REE-free carbonates (i.e., calcite, ankerite, and siderite); and (iii) LREE is more abundant than HREE. Grades of REE minerals, sulfides and oxides are richer in the concentrate than in the host lithologies. The geochemical test results show that low concentrations of light REE are leached under kinetic testing conditions (8.8-139.6 µg/L total light REE). These results are explained by a low reactivity of the REE-bearing carbonates in the kinetic testing conditions, low amounts of REE in solids, and by precipitation of secondary REE minerals.
DS2002-1238
2002
Eddleman, J.L.Pederson, J.L., Mackley, R.D., Eddleman, J.L.Colorado Plateau uplift and erosion evaluated using GISGsa Today, Vol. 12, No. 8, August pp. 4-10.Colorado, Arizona, Utah, New MexicoStratigraphic - geomorphology, epeirogeny
DS1999-0458
1999
Eddy, B.McCurdy, M.W., Anglin, C.D., Spirito, W.A., Eddy, B.Geochemical surveys and interpretation. Briefly mentions diamondGeological Survey of Canada (GSC) Open File, No. 3714, pp. D1-34.. $ 50.00Northwest Territories, Nunavut, Bathurst IslandGeochemistry
DS2001-0450
2001
Eddy, B.Harris, J.R., Eddy, B., Rencz, A., De Kemp, et al.Remote sensing as a geological mapping took in the Arctic: preliminary results from Baffin Island.Can. Geological Survey Current Research, No. 2001-E12, 22p.Northwest Territories, Nunavut, Baffin IslandRemote sensing
DS200812-1027
2008
EdelSchulmann, K., Lexa, O., Stipska, P., Racek, M., Tajcmanova, L., Konpasek, Edel, Peschler, LehmannVertical extension and horizontal channel flow of orogenic lower crust: key exhumation mechanisms in large hot orogens?Journal of Metamorphic Geology, In press availableEurope, MantleGeophysics - bouguer
DS1975-0272
1976
Edel, YU. U. K.Edel, YU. U. K.The Role of Cavitation in Diamond FormationAkad. Nauk. Sssr Izv. Ser. Geol. Vol. 1976, No. 11, PP. 147-148.RussiaKimberlite
DS1988-0187
1988
Edelman, S.H.Edelman, S.H.Ophiolite generation and emplacement by rapid subduction hinge retreat ona continent -bearing plateGeology, Vol. 16, No. 4, April pp. 311-313GlobalTectonics, Ophiolite
DS1991-0419
1991
Edelman, S.H.Edelman, S.H.Relationships between kinematics of arc continent collision and kinematics of thrust faults, folds, shear zones, and foliations in the Nevadan Orogen, CaliforniaTectonophysics, Vol. 191, No. 3-4, June 1, pp. 223-236CaliforniaStructure, Nevadan Orogeny
DS1991-0420
1991
Edelman, S.H.Edelman, S.H.A critical review of tectonic processes at continental margin orogensTectonophysics, Vol. 191, No. 3-4, June 1, pp. 199-213GlobalTectonics, Margins
DS1996-0407
1996
Edey, G.Edey, G.Financial analysis and decision making for mineral deposits #1Prospectors and Developers Association of Canada (PDAC) Short Course for Developing Country, pp. 121-130GlobalMining economics, Developing countries, Short course notes
DS1992-0409
1992
Edgar, A.Edgar, A.Role of fluids in mafic-ultramafic alkaline magmatism and the formation ofdiamondsProceedings of the 29th International Geological Congress. Held Japan August 1992, Vol. 2, abstract p. 570GlobalLamproites, Alkaline magma
DS1980-0039
1980
Edgar, A.D.Arima, M., Edgar, A.D.Stability of Wadeite ( Zr2 K4 Si6 O18) Under Upper Mantle Conditions: petrological Implications.Contributions to Mineralogy and Petrology, Vol. 72, No. 2, PP. 191-196.AustraliaLeucite, Lamproite, Petrochemistry
DS1980-0040
1980
Edgar, A.D.Arima, M., Edgar, A.D.Stability of Wadeite (zr2 K4si6o18) Under Upper Mantle Conditions: Petrological Implications.Contributions to Mineralogy and Petrology, Vol. 72, PP. 191-195.United States, Wyoming, AustraliaLeucite
DS1980-0115
1980
Edgar, A.D.Edgar, A.D.Role of Subduction in the Genesis of Leucite Bearing Rocks:facts or Fashion.Contributions to Mineralogy and Petrology, Vol. 73, No. 4, PP. 429-431.United States, Wyoming, Italy, Indonesia, Rocky Mountains, Leucite HillsBlank
DS1980-0116
1980
Edgar, A.D.Edgar, A.D., Condliffe, E., Barnett, R.L., Shirran, R.J.An Experimental Study of an Olivine Ugandite Magma and Mechanisms for the Formation of its K Enriched Derivatives.Journal of Petrology, Vol. 21, No. 3, PP. 475-497.GlobalLeucitite, Leucite, Genesis
DS1980-0203
1980
Edgar, A.D.Kuehner, S.M., Edgar, A.D., Arima, M.Origin of the Ultrapotassic Rocks from the Leucite Hills, Wyoming.Geological Society of America (GSA), Vol. 12, No. 7, P. 467. (abstract.).United States, Wyoming, Rocky Mountains, Leucite HillsLeucite Hills, Leucite, Rocky Mountains
DS1981-0067
1981
Edgar, A.D.Arima, M., Edgar, A.D.Substitution Mechanisms and Solubility of Titanium in Phlogopites from Rocks of Probable Mantle Origin.Contributions to Mineralogy and Petrology, Vol. 77, PP. 288-295.Australia, United States, WyomingLeucite
DS1981-0255
1981
Edgar, A.D.Kuehner, S.M., Edgar, A.D., Arima, M.Petrogenesis of the Ultrapotassic Rocks from the Leucite Hills, Wyoming.American Mineralogist., Vol. 66, No. 7-8, PP. 663-677.United States, Wyoming, Rocky Mountains, Leucite HillsBlank
DS1983-0108
1983
Edgar, A.D.Arima, M., Edgar, A.D.A High Pressure Experimental Study on a Magnesian Rich Leucite Lamproite from the West Kimberley Area, Australia: Petrogenetic Implications.Contributions to Mineralogy and Petrology, Vol. 84, No. 2-3, PP. 228-234.Australia, Western AustraliaRelated Rocks, Petrography, Petrology, Wolgidite, Mineral Chemitry
DS1983-0109
1983
Edgar, A.D.Arima, M., Edgar, A.D.high pressure EXPERIMENTAL STUDIES ONA KATUNGITE and THEIR BEARING on the GENESIS of SOME POTASSIUM RICH MAGMAS of the WEST BRANCH of the AFRICAN RIFT.Journal of PETROLOGY, Vol. 24, PT. 2, PP. 166-187.Central Africa, UgandaMineral Chemistry, Mafurite
DS1983-0211
1983
Edgar, A.D.Edgar, A.D., Arima, M.Conditions of Phlogopite Crystallization in Ultrapotassic Volcanic Rocks.Mineralogical Magazine., Vol. 47, MARCH PP. 11-19.United States, Wyoming, Germany, California, West Coast, Australia, Spain, UgandaLeucite
DS1984-0254
1984
Edgar, A.D.Edgar, A.D., Arima, M.Experimental Studies on K Metasomatism of a Model Pyrolite Mantle and Their Bearing on the Genesis of Ultrapotassic Magmas.Petrology (igneous And Metamorphic Rocks), 27th. International Geol., Vol. 9, PP. 509-541.GlobalKimberlite Nodules
DS1984-0255
1984
Edgar, A.D.Edgar, A.D., Arima, M.Experimental studies on K metasomatism of a model pyrolite mantle and their bearing on the genesis of ultrapotassic magmasIn: Proceedings of the 27th. International Geological Congress held Moscow, August, pp. 509-542GlobalMantle
DS1985-0158
1985
Edgar, A.D.Dubeau, M.I., Edgar, A.D.The Stability of Priderite Up to 30 Kb: Inferences on its Potential As a Reservoir for K, Ba and Ti in Mantle Sources For Lamproitic Magmas.Geological Association of Canada (GAC)., Vol. 10, P. A15, (abstract.).GlobalExperimental Petrology
DS1985-0159
1985
Edgar, A.D.Dubeau, M.L., Edgar, A.D.Priderite Stability in the System K2mgti7o16 - Ba Mg7o16Mineralogical Magazine, Vol. 49, pp. 603-606AustraliaLamproite, Priderite
DS1985-0168
1985
Edgar, A.D.Edgar, A.D.Experimental Studies Pertinent to Alkaline Rocks: an Overview of the Last Decade.Conference Report of The Meeting of The Volcanic Studies Gro, 1P. ABSTRACT.GlobalExperimental Research
DS1985-0169
1985
Edgar, A.D.Edgar, A.D., Arima, M.Fluorine and Chlorine Contents of Phlogopites Crystallized from ultrapotassic Rock Compositions in High Pressure Experiments- Implications for halogen Reservoirs in Source Regions.American MINERALOGIST., Vol. 70, No. 5-6, PP. 529-536.Canada, Ontario, United States, State Line, Wyoming, Leucite Hills, UgandaPetrology Wolgidite
DS1985-0170
1985
Edgar, A.D.Edgar, A.D., Arima, M.Fluorine and Chlorine Contents of Phlogopites in High Pressure Melting experiments on Ultrapotassic Rocks: Implications for Fluorine and Chlorine rservoirs in Mantle Source Regions.Geological Association of Canada, Vol. 10, P. A 16, (abstract.).GlobalExperimental Petrology
DS1985-0398
1985
Edgar, A.D.Lloyd, F.E., Arima, A.M., Edgar, A.D.Partial Melting of a Phlogopite Clinopyroxenite Nodule: an Experimental Study on the Origin of High Pressureotassic Rocks.Geological Association of Canada (GAC)., Vol. 10, P. A35, (abstract.).GlobalExperimental Petrology
DS1985-0680
1985
Edgar, A.D.Trones, R.G., Edgar, A.D., Arima. m.Titanium Solubility in Phlogopite: an Experimental Study On its Potential As a P-t Indicator for Upper Mantle- Lower Crustal Rocks.Geological Association of Canada (GAC)., Vol. 10, P. A 63, (abstract.).GlobalExperimental Petrology
DS1986-0205
1986
Edgar, A.D.Edgar, A.D., Arima, M., Baldwin, D.K., Bell, D.R., Shee, S.R., Skinner, E.M.high pressure melting experiments on an aphanitic kimberlite from the Wesselton mine, Kimberley South AfricaProceedings of the Fourth International Kimberlite Conference, Held Perth, Australia, No. 16, pp. 170-172South AfricaBlank
DS1987-0176
1987
Edgar, A.D.Edgar, A.D.Halogens in lamproites, lamprophyres and ultrapotassic rocks: abundances and significance in mantle source regionsGeological Association of Canada (GAC), Vol.12, p.40. abstractGlobalHalogens, Geochemistry
DS1987-0177
1987
Edgar, A.D.Edgar, A.D.Mantle heterogeneity in source regions for lamproites and related magmas-inferences from experimental petrologyTerra Cognita, Conference abstracts Oceanic and Continental Lithosphere:, Vol. 7, No. 4, Autumn, abstract only p. 611GlobalBlank
DS1988-0188
1988
Edgar, A.D.Edgar, A.D., Arima, M., Baldwin, D.K., Bell, D.R., Shee, S.R.High-pressure-high temperature melting experiments on a SiO2poor aphanitic kimberlite from the Wesselton mine, Kimberley,South AfricaAmerican Mineralogist, Vol. 73, No. 5-6 May June pp. 524-533South AfricaBlank
DS1989-0390
1989
Edgar, A.D.Edgar, A.D.Barium enriched apatites from lamproites of west Kimberley,WesternAustraliaGeological Association of Canada (GAC) Annual Meeting Program Abstracts, Vol. 14, p. A98. (abstract.)AustraliaLamproite
DS1989-0391
1989
Edgar, A.D.Edgar, A.D.Barium and strontium enriched apatites in lamproites from West Western AustraliaAmerican Mineralogist, Vol. 74, No. 7 and 8, July-August pp. 889-895AustraliaLamproites, Chemical analyses
DS1989-0392
1989
Edgar, A.D.Edgar, A.D.Significance of F-distribution in minerals and glass in lamproites And related ultrapotassic magmasGeological Association of Canada (GAC) Annual Meeting Program Abstracts, Vol. 14, p. A71. (abstract.)GlobalGaussberg, Leucite Hills, Smoky Butte, Prairie Creek
DS1989-1494
1989
Edgar, A.D.Thibault, Y., Edgar, A.D.Modelling of Ca-metasomatism in a model pyrolite up to 30KBAR: implication son the importance of Ca relativeto K and Na MetasomatismGeological Association of Canada (GAC) Annual Meeting Program Abstracts, Vol. 14, p. A50. (abstract.)GlobalExperimental Petrology, Metasomatism
DS1989-1573
1989
Edgar, A.D.Walker, E.C., Edgar, A.D.high pressure- high-temperature melting: experiments on a diamondiferous olivine lamproite from Prairie Creek ArkansawGeological Association of Canada (GAC) Annual Meeting Program Abstracts, Vol. 14, p. A23. (abstract.)ArkansasExperimental petrology, Lamproite
DS1991-0421
1991
Edgar, A.D.Edgar, A.D.Source regions for ultrapotassic mafic-ultramafic magmatism in southwest Uganda:implications for experimental studies.Magmatism in Extensional structural settings, Springer pp. 73-84.UgandaAlkaline rocks, Ultrapotassic magmatism
DS1991-0422
1991
Edgar, A.D.Edgar, A.D., Charbonnel, H.E.Fluorine bearing phases in lamproitesMineral. Petrol, Vol. 44, No. 1-2, pp. 125-149GlobalLamproites, Mineral chemistry
DS1991-0423
1991
Edgar, A.D.Edgar, A.D., Vukadinovic, D., Lloyd, F.E.Distribution of fluorine between minerals and glass in lamproites, lamprophyres and kamafugites: implications for the role of F in deep mantle derived magmasProceedings of Fifth International Kimberlite Conference held Araxa June 1991, Servico Geologico do Brasil (CPRM) Special, pp. 79-81Uganda, Germany, Australia, Wyoming, ColoradoLamproites, Petrology
DS1991-1478
1991
Edgar, A.D.Ryabchikov, I.D., Edgar, A.D., Wyllie, P.J.Partial melting in a carbonate-phosphate-peridotite system at 30 KbarGeochemistry International, Vol. 28, No. 9, pp. 1-6MantleMelting, Peridotite
DS1991-1479
1991
Edgar, A.D.Ryabchikov, I.D., Edgar, A.D., Wyllie, P.J.Partial melting in the system carbonate phosphate peridotite at 30 kbar.(Russian)Geochemistry International (Geokhimiya), (Russian), No. 2, February pp. 163-168RussiaExperimental petrology, Peridotite
DS1991-1822
1991
Edgar, A.D.Walker, E.C., Edgar, A.D.Changing phase relations -mineral chemistry during ascent the Prairie Creek olivine lamproite, demons. by high pressure- high temp. suprasolidusexperiments.Geological Association of Canada (GAC)/Mineralogical Association of Canada/Society Economic, Vol. 16, Abstract program p. A130ArkansasMineral chemistry, Lamproite
DS1992-0410
1992
Edgar, A.D.Edgar, A.D., Charbonneau, H.E., Mitchell, R.H.Phase relations of an armalcolite-phlogopite lamproite from Smoky Butte, Montana: applications to lamproite genesisJournal of Petrology, Vol. 33, No. 3, pp. 505-520MontanaLamproite, Phase relations
DS1992-0411
1992
Edgar, A.D.Edgar, A.D., Vukadinovic, D.Implications of experimental petrology to the evolution of ultrapotassicrocksLithos, Vol. 28, No. 3-6. November pp. 205-220GlobalPetrology, Ultrapotassic
DS1992-1285
1992
Edgar, A.D.Rock, N.M.S., Griffin, B.J., Edgar, A.D., Paul, D.K., Hergt, J.M.A spectrum of potentially Diamondiferous lamproites and minettes from the Jharia coalfield eastern IndiaJournal of Volcanology and Geothermal Research, Vol. 50, No. 1/2, April 15, pp. 55-84IndiaLamproites, Jharia coalfield
DS1992-1538
1992
Edgar, A.D.Thibault, Y., Edgar, A.D., Lloyd, F.E.Experimental investigation of melts from a carbonated phlogopitelherzolite: implications for metasomatism in the continental lithosphericmantleAmerican Mineralogist, Vol. 77, No. 7, 8 July-August pp. 784-794MantleExperimental petrology, Lherzolite
DS1993-0389
1993
Edgar, A.D.Edgar, A.D.Small degrees of partial melting in the mantle and mantle metasomatism: an experimental viewMineralogical Association of Canada, Experiments at high pressure and, Short Course Volume 21, May 1993 pp. 385-414MantleModels of Metasomatism
DS1993-0390
1993
Edgar, A.D.Edgar, A.D., Charbonneau, H.E.Melting experiments on a SiO2 poor, CaO rich aphanitic kimberlite from 5-10GPa and their bearing on sources of kimberlite magmasAmerican Mineralogist, Vol. 78, No. 1, 2, January-February pp. 132-142South AfricaWesselton mine, Magmas-source
DS1993-0391
1993
Edgar, A.D.Edgar, A.D., Vukadinovic, D.Potassium rich clinopyroxene in the mantle - an experimental investigation of a potassium-rich lamproite up to 60 KBAR.Geochimica et Cosmochimica Acta, Vol. 57, No. 23-2, December pp. 5063-5072.MantleLamproite, Experimental petrology
DS1993-0392
1993
Edgar, A.D.Edgar, A.D., Vukadinovic, D.Additional mantle reservoirs for Potassium, Barium and other elements characteristics of ultrapotassic and related magmas, implications from high pressure and temperature experiGeological Association of Canada (GAC), Geological Association of Canada, Abstract Vol. p. A26MantleExperimental petrology, ultra potassic magma, Ultrapotassic rocks
DS1993-0921
1993
Edgar, A.D.Lloyd, F.E., Edgar, A.D.light rare earth element (LREE) distribution in accessory minerals from southwest Ugand an xenoliths and their kamafugite hosts: an electron microprobe studyRare earth Minerals: chemistry, origin and ore deposits, International Geological Correlation Programme (IGCP) Project, pp. 73-75. abstractUgandaXenoliths, Rare earths
DS1993-1449
1993
Edgar, A.D.Sheen, J.D., Edgar, A.D.Partial melting experiments on a phlogopite harzburgite at 3.0 GPa in relation to lamproite mantle source regions.Geological Association of Canada (GAC), Geological Association of Canada (GAC)/Mineralogical Association of Canada (MAC) Annual Meeting, Abstract, Abstract Vol. p. A95.MantleExperimental petrology, Lamproite
DS1993-1685
1993
Edgar, A.D.Vukadinonovic, D., Edgar, A.D.Phase relations in the phlogopite-apatite system at 20 kbar; Implications for the role of fluorine in mantle melting.Contribution to Mineralogy and Petrology, Vol. 114, pp. 247-254.MantleMelt, Experimental petrology
DS1994-0273
1994
Edgar, A.D.Carrier, S., Edgar, A.D.Melting experiments on kimberlites: a delicate approach in determining the magma source.Geological Association of Canada (GAC) Abstract Volume, Vol. 19, p.GlobalPetrology -experimental, Magma
DS1994-0482
1994
Edgar, A.D.Edgar, A.D., Lloyd, F.E., Vukadinov, D.The role of fluorine in the evolution of ultrapotassic magmasMineralogy and Petrology, Vol. 51, No. 2-4, pp. 173-193.GlobalUltrapotassic, Alkaline rocks
DS1994-0483
1994
Edgar, A.D.Edgar, A.D., Mitchell, R.H., Gulliver, C.B.New mineral species found in experiments at continental mantle pressures(2-8 GPa) in kimberlite and lamproiteInternational Symposium Upper Mantle, Aug. 14-19, 1994, Extended abstracts pp. 19-20.MontanaMineralogy, Deposit -Smoky Butte
DS1994-0484
1994
Edgar, A.D.Edgar, A.D., Pizzolato, L.A.What is the role of fluorine in the genesis of lamproites and the associated K enriched magmas?Geological Association of Canada (GAC) Abstract Volume, Vol. 19, p.GlobalLamproites, Magmas
DS1994-0485
1994
Edgar, A.D.Edgar, A.D., Pizzolato, L.A., Butler, G.M.Petrology of the ultramafic lamprophyre and associated rocks at CoralRapids, Abitibi River, Ontario.Canadian Journal of Earth Sciences, Vol. 31, No. 8, August, pp. 1325-1334.OntarioLamprophyres, alkaline, Deposit -Coral Rapids district
DS1994-0673
1994
Edgar, A.D.Gulliver, C.G., Edgar, A.D.Alternate reservoirs for Potassium, Barium, Titanium, Flourine and Phosphorus in the enriched continental mantle.Geological Association of Canada (GAC) Abstract Volume, Vol. 19, p.MantleAlkaline rocks
DS1994-1585
1994
Edgar, A.D.Sheen, J.D., Edgar, A.D.Experimental investigation of melts from phlogopite harzburgite:implications for mantle low degree melt sources of lamproite magmas.Geological Association of Canada (GAC) Abstract Volume, Vol. 19, p.GlobalLamproite, Petrology - experimental
DS1994-1951
1994
Edgar, A.D.Woolley, A.R., Bergman, S., Edgar, A.D., Le Bas, M.J., MitchellClassification of the lamprophyres, lamproites, kimberlites and thekalsilite, melilite and leucite bearing rocks.Submitted to Journal of Petrology, 32p.GlobalSystematics of Igneous rocks, Classification
DS1995-0480
1995
Edgar, A.D.Edgar, A.D., Carrier, S.Towards a petrogenetic grid for kimberlitesGeological Society Africa 10th. Conference Oct. Nairobi, p. 115. Abstract.South Africa, Northwest Territories, Somerset IslandKimberlites, classification, Deposit -Wesselton, Tunraq
DS1995-0698
1995
Edgar, A.D.Gulliver, C.E., Edgar, A.D.New potential mantle reservoirs for incompatible and volatiles and role genesis of ultrapotassioc magmas.Geological Society Africa 10th. Conference Oct. Nairobi, p. 116. Abstract.GlobalUltrapotassic magmas, Lamproites, lamprophyres, kamafugites, kimberlites
DS1995-1722
1995
Edgar, A.D.Shaw, C.S., Edgar, A.D., Thibault, Y.Is there a single metasomatizing fluid in the mantle? Implications from glass compositions - mantle xenolithsGeological Society Africa 10th. Conference Oct. Nairobi, p. 119-20. Abstract.Uganda, Germany, AustraliaMantle Metasomatism, Xenoliths
DS1996-0233
1996
Edgar, A.D.Carpenter, R.L., Edgar, A.D.Mantle xenoliths hosted in Tertiary magmas of the Hessian depression: acomparison Quat. West EifelGeological Association of Canada (GAC) Annual Abstracts, Vol. 21, abstract only p.A16.GermanyXenoliths, West Eifel
DS1996-0408
1996
Edgar, A.D.Edgar, A.D.Kasilite bearing volcanics (kamafugites)Mineralogical Association of Canada Short Course, Vol. 24, pp. 153-174.GlobalKasilite, Kamafugites
DS1996-0409
1996
Edgar, A.D.Edgar, A.D., Pizzolato, L.A., Sheen, J.Fluorine in igneous rocks and minerals emphasis on ultrapotassic mafic and ultramafic magma mantle source.Mineralogical Magazine, Vol. 60, No. 2, April 1, pp. 243-258.MantleMagma -ultrapotassic
DS1996-0858
1996
Edgar, A.D.Lloyd, F.E., Edgar, A.D., Ragnarsdottir, K.V.light rare earth element (LREE) distribution in perovskite, apatite and titanite from southwestUgand an xenoliths and kamafugite lavas.Mineralogy and Petrology, Vol. 57, No. 3-4, pp. 205-228.UgandaPerovskite, Rare earths, xenoliths
DS1996-1048
1996
Edgar, A.D.O'Connor, T.K., Edgar, A.D., Lloyd, F.E.Origin of glass in Quaternary mantle xenoliths from Meerfeldmaar West EifelGermany: implications mantleCanadian Mineralogist, Vol. 34, pt. 2, April pp. 187-200.GermanyLithospher -mantle, Xenoliths
DS1996-1537
1996
Edgar, A.D.Wiese, R.G., Edgar, A.D., Barnett, R.L.Textural and compositional variations in phlogopite and biotite In kimberlite from Fayette County, Kimb. magmaNeues Jahrb. fur Mineralogie, Abhandl., Vol. 170, No. 2, pp. 111-126.United States, PennsylvaniaKimberlite magma, Petrology
DS1996-1559
1996
Edgar, A.D.Woolley, A.R., Bergman, S.C., Edgar, A.D., Le Bas, M. et.Classification of lamprophyres, lamproites, kimberlites and the melilitic and leucitic rocks.Canadian Mineralogist, Vol. 34, pt. 2, April pp. 175-186.GlobalClassification, Kimberlites, lamproites
DS1997-0308
1997
Edgar, A.D.Edgar, A.D., Mitchell, R.H.Ultra high pressure - temperature melting experiments on an SIO2 rich lamproite from Smoky Butte, Montana....Journal of Petrology, Vol. 38, No. 4, April 1, pp. 457-478.MontanaMagmas - siliceous lamproite magmas, Mantle enrichment - deep
DS2000-0736
2000
Edgar, A.D.Orlando, A., Thibault, Y., Edgar, A.D.Experimental study of the K2ZrSi309 (wadeite) K2TiSi309 and K2(ZrTi) phlopite systems at 2-3 GPa.Contributions to Mineralogy and Petrology, Vol. 139, No. 2, pp. 136-45.GlobalPetrology - experimental, Wadeite
DS2002-0258
2002
Edgar, A.D.Carpenter, R.L., Edgar, A.D., Thibault, Y.Origin of spongy textures in clinopyroxene and spinel from mantle xenoliths Hessian Depression, Germany.Mineralogy and Petrology, Vol. 74,2-4, pp. 149-62.GermanyXenoliths
DS2002-1063
2002
Edgar, A.D.Mitchell, R.H., Edgar, A.D.Melting experiments on SiO 2 rich lamproites to 6.4 GPa and their bearing on the sources of lamproitic magmas.Mineralogy and Petrology, Vol. 74, 2-4, pp. 115-28.GlobalLamproites - petrology, silica rich lamproites
DS1987-0460
1987
Edgard, A.D.McNeil, A.M., Edgard, A.D.Sodium rich metasomatism in the upper mantle- implications of experimentson the pyrolite NA2) rich fluid system at950 degrees C and 20 MBAR.Geochimica et Cosmochimica Acta, Vol. 51, No. 9, September pp. 2285-2294GlobalExperimental Petrology
DS1998-0949
1998
Edgley, G.J.Martin, J., Edgley, G.J.Environmental management systems: a guide for planning, development andimplementationGovernment Institutes, $ 75.00GlobalBook - ad, Environment
DS1981-0146
1981
Edick, M.J.Edick, M.J., Byerly, G.R.Post Paleozoic Igneous Activity in the Southeastern United States.Geological Society of America (GSA), Vol. 13, No. 5, P. 236. (abstract.).United States, Gulf Coast, ArkansasPetrology
DS201812-2887
2018
Edinburgh Ion Micro-Probe facilityStachel, T., Harris, J.W., Hunt, L., Muehlenbachs, K., Kobussen, A.F., Edinburgh Ion Micro-Probe facilityArgyle deposit: Argyle diamonds: how subduction along the Kimberley craton edge generated the world's biggest diamond deposit.Society of Economic Geology Geoscience and Exploration of the Argyle, Bunder, Diavik, and Murowa Diamond Deposits, Special Publication no. 20, pp. 145-168.Australia, western Australiadeposit - Argyle
DS1860-0130
1871
Edinburgh Review JournalEdinburgh Review JournalCorrespondence Between the Governor of the Cape Colony ( Orange and Vaal rivers)Edinburgh Review Journal, Vol. 134, Oct., PP. 410-448.Afrca, South Africa, Cape ProvinceHistory
DS1860-1061
1899
Edinburgh Review JournalEdinburgh Review JournalOrigin of Diamonds (1899)Edinburgh Review Journal, Vol. 189, APRIL PP. 316-334.Africa, South Africa, GlobalDiamond Genesis
DS201012-0289
2010
editorHowarth, R.J., editorVarious papers on the history and development of geochemistry - prospecting, analytical methodology, gas geochemistry, John Webb's legacy....Geochemistry: Exploration, Environment, Analysis, Vol. 10, 3, whole issueTechnologyImperial College contributions to geochemistry
DS200612-1151
2006
editorsReimold, W.U., Gibson, R.L., editorsProcesses on the Early Earth.Geological Society of America, Processes on the Earth, Special Paper 405,Africa, AustraliaPapers of interest identified by authors
DS200612-1152
2006
editorsReiners, P.W., Ehlers, T.A., editorsLow temperature thermochronology: techniques, interpretations and applications.Mineralogical Society of America, Review in Mineralogy and Geochemistry, Vol. 58, 620p. approx. $ 40. business @minsocam.orgGlobalBook - thermochronology
DS200612-1503
2004
editorsWall, F., Zaitsev, A.N., editorsPhoscorites and carbonatites from mantle to mine: the key example of the Kola alkaline province.Mineralogical Society Series, Vol. 10, 498p. approx $160.USRussia, Kola PeninsulaBook - carbonatites, phoscorites
DS200712-0529
2007
editorsKeppler, H., Smythe, J.R., editorsWater in nominally anhydrous minerals.Reviews in Mineralogy & Geochemistry, Vol. 62, 478p.MantleBook - mantle mineralogy
DS201112-0198
2010
editorsColtori, M., Downes, H., Gregoirue, M., O'Reilly, S.Y.,editorsPetrological evolution of the European lithospheric mantle.Geological Society of London, Special Publ., 337, 246p.MantleBook - review
DS1998-0380
1998
Edler, E.Edler, E., Winter, F., Edwards, R.The Rosario do Sul kimberlitic province, Rio Grande do Sul State, SouthernBrasil.7th International Kimberlite Conference Abstract, pp. 202-204.Brazil, Grande do SulPetrography, Deposit - Rosario
DS1995-0481
1995
Edmond, J.M.Edmond, J.M., et al.The fluvial geochemistry and denudation rate of the Guayana Shield, inVenezuela, Colombia and Brasil.Geochimica et Cosmochimica Acta, Vol. 16, pp. 3301-25.Venezuela, Colombia, BrazilGeochemistry, Geomorphology
DS1998-0648
1998
Edmond, J.M.Huh, Y., Tsoi, M.Y., Zatsev, A., Edmond, J.M.The fluvial geochemistry of the rivers of eastern Siberia: Tributaries of Lena River draining Sed....Geochimica et Cosmochimica Acta, Vol. 62, No. 10, May pp. 1657-76.Russia, SiberiaSiberian Craton - sedimentary Platform, Geochemistry - Lena River
DS1999-0319
1999
Edmond, J.M.Huh, Y., Edmond, J.M.The fluvial geochemistry of the rivers of Eastern Siberia: III Tributaries of the Lena and Anabar ...Geochimica et Cosmochimica Acta, Vol. 63, No. 7-8, Apr. 1, pp. 967=88.Russia, SiberiaGeochemistry, geomorphology, Basement terrain - drainage
DS2001-0944
2001
Edmond, J.M.Potter, P.E., Huh, Y., Edmond, J.M.Deep freze petrology of Lena River sand, SiberiaGeology, Vol. 29, No. 11, Nov. pp. 999-1002.Russia, SiberiaGeomorphology - modern sand not specific to diamonds
DS1995-0482
1995
Edmond. J.M.Edmond. J.M., Palmer, M.R., Staillard, R.F.The fluvial geochemistry and denudation rate of the Guyana shield inVenezuela, Colombia and Brasil.Geochimica et Cosmochimica Acta, Vol. 59, No. 16, August 1, pp. 3301-3326.Venezuela, Colombia, BrazilGeochemistry, Geomorphology
DS201012-0196
2010
Edmonds, A.M.Felton, S., Cann, B.J., Edmonds, A.M., Liggins, S., Cruddace, R.J., Newton, M.E., Fisher, D., Baker, J.M.Electron paramagnetic resonance studies of nitrogen interstital defects in diamond.Journal of Physics Condensed Matter, Vol. 21, 36, pp. 364212-219.TechnologyDiamond crystallography
DS201808-1785
2018
Edmonds, A.M.Rose, B.C. ,Huang, D., Zhang, Z-H., Stevenson, P., Tyryshkin, A.M., Sangtawesin, S., Srinivasan, S., Loudin, L., Markham, M.L., Edmonds, A.M., Twitchen, D.J., Lyon, S.A., de Leon, N.P.Observation of an environmentally insensitive solid-state spin defect in diamond.Science , Vol. 361, July 6, p. 60-63.Technologysynthetic

Abstract: Engineering coherent systems is a central goal of quantum science. Color centers in diamond are a promising approach, with the potential to combine the coherence of atoms with the scalability of a solid-state platform. We report a color center that shows insensitivity to environmental decoherence caused by phonons and electric field noise: the neutral charge state of silicon vacancy (SiV0). Through careful materials engineering, we achieved >80% conversion of implanted silicon to SiV0. SiV0 exhibits spin-lattice relaxation times approaching 1 minute and coherence times approaching 1 second. Its optical properties are very favorable, with ~90% of its emission into the zero-phonon line and near -transform-limited optical linewidths. These combined properties make SiV0 a promising defect for quantum network applications.
DS201703-0400
2017
Edmonds, M.Edmonds, M., Manning, C.Synthesizing our understanding of Earth's deep carbon. Udachnaya pipe used as an example.EOS Transaction of AGU, https://doi.org/10.1029/2017EO67913RussiaCarbon
DS201704-0623
2017
Edmonds, M.Edmonds, M., Wallace, P.J.Volatiles and exsolved vapor in volcanic systems.Elements, Vol. 13, 1, pp. 29-34.MantleMagmatism

Abstract: The role of volatiles in magma dynamics and eruption style is fundamental. Magmatic volatiles partition between melt, crystal, and vapor phases and, in so doing, change magma properties. This has consequences for magma buoyancy and phase equilibria. An exsolved vapor phase, which may be distributed unevenly through reservoirs, contains sulfur and metals that are either transported into the atmosphere or into ore deposits. This article reviews the controls on volatile solubility and the methods to reconstruct the volatile budget of magmas, focusing particularly on the exsolved vapor phase to explore the role of volatiles on magma dynamics and on eruption style.
DS201911-2568
2019
Edmonds, M.Suarez, C.A., Edmonds, M., Jones, A.P.Earth catastrophes and their impact on the carbon cycle.Elements, Vol. 15, pp. 301-306.Mantlecarbon

Abstract: Carbon is one of the most important elements on Earth. It is the basis of life, it is stored and mobilized throughout the Earth from core to crust and it is the basis of the energy sources that are vital to human civilization. This issue will focus on the origins of carbon on Earth, the roles played by large-scale catastrophic carbon perturbations in mass extinctions, the movement and distribution of carbon in large igneous provinces, and the role carbon plays in icehouse-greenhouse climate transitions in deep time. Present-day carbon fluxes on Earth are changing rapidly, and it is of utmost importance that scientists understand Earth's carbon cycle to secure a sustainable future.
DS201012-0181
2009
Edmonton JournalEdmonton JournalDe Beers polishes up Snap Lake site.Edmonton Journal, Dec. 5, 1p.Canada, Northwest TerritoriesNews item - De Beers
DS2000-0262
2000
Ednie, H.Ednie, H.Logistics in mining... hauling, maintenace Ekati mineThe Canadian Mining and Metallurgical Bulletin (CIM Bulletin) ., Vol. 93, No. 1043, Sept. pp. 28-31.Northwest TerritoriesMining - winter roads, transporation, Deposit - Ekati
DS2002-0418
2002
Ednie, H.Ednie, H.Diamond fever... Canadians leap to the forefront on the world sceneCanadian Institute of Mining Bulletin, Vol. 95, No. 1057, Jan. pp. 19-28.Canada, Northwest Territories, Nunavut, Alberta, OntarioNews item, Deposit - Ekati, Snap Lake, Jericho
DS2002-0419
2002
Ednie, H.Ednie, H., Mottola, L.Knowledge management: proven strategies for managing corporate intellectual capitalCanadian Institute Mining Bulletin, Vol. 95, No. 1066, Nov. pp. 11-17.GlobalTime and financial management - global
DS2003-0369
2003
Ednie, H.Ednie, H.Mining the Canadian north. Overview... mentions diamond miningCanadian Mining and Metallurgical Bulletin, July issue, pp. 35-45.Northwest TerritoriesNews item
DS2003-0370
2003
Ednie, H.Ednie, H.Diavik diamond mines. Gems spill forth from Lac de GrasResources World, Feb. pp. 13-24.Northwest TerritoriesNews item, Diavik
DS200412-0503
2003
Ednie, H.Ednie, H.Consultants and contractors.. current trends in consulting and contracting for the mining industry.Canadian Institute of Mining and Metallurgy Bulletin, Vol. 96, 1075, Nov-Dec. pp. 9-14.CanadaLegal - mining
DS200412-0504
2003
Ednie, H.Ednie, H.Mining the Canadian north. Overview... mentions diamond mining.Canadian Institute of Mining and Metallurgical Bulletin, July issue, pp. 35-45.Canada, Northwest TerritoriesNews item
DS200512-0257
2005
Ednie, H.Ednie, H.Water be damned... new dyke under construction at Diavik.Canadian Institute of Mining and Metallurgy Bulletin, Vol. 98, 1087, May p. 8-9.Canada, Northwest TerritoriesMining - Diavik
DS200612-0364
2005
Ednie, H.Ednie, H., Nichiporuk, A.De Beers constructs two new mines. Snap Lake and Victor.Canadian Institute of Mining and Metallurgy Bulletin, November p. 54,56,58.Canada, Northwest Territories, OntarioMining - De Beers
DS1998-0090
1998
Edson, J.D.Bauer, R.L., Gresham, D.A., Edson, J.D.Early Proterozoic ductile reworking of Archean basement in the Central Laramie Range: a complex response...Basement Tectonics, Vol. 12, pp. 219-222.WyomingCheyenne Belt, Trans Hudson Orogen, Central Plains
DS1998-0053
1998
EdwardsAsmeron, Y., Cheng, Edwards, Thomas, Hirschmann231 Pa 235 U constraints on mantle meltingMineralogical Magazine, Goldschmidt abstract, Vol. 62A, p. 81-2.MantleGeodynamics, Alkali basalts
DS1970-0072
1970
Edwards, A.C.Edwards, A.C.Report on TanzaniaMwadui Eng. Association Journal, MARCH, PP. 3-17.Tanzania, East AfricaDiamonds, Mining, Geology
DS1975-0749
1978
Edwards, A.C.Gleadow, A.J.W., Edwards, A.C.Mineralogical Note: Fission Track Age of a Basic Inclusion from the kayrunnera Kimberlitic Breccia Pipe.Geological Society AUST. Journal, Vol. 25, PP. 323-340; P. 359.Australia, New South WalesKimberlite
DS1975-1003
1979
Edwards, A.C.Edwards, A.C., Hughes, T.C., Lovering, J.F.iron RICH GARNET CLINOPYROXENES from the KAYRUNNERA KIMBERLITIC DIATREME.B.m.r. Rec. Min. Res. Geol. Geophys., 1979/2, P. 26, (abstract.).Australia, New South WalesKimberlite, Xenoliths
DS1975-1004
1979
Edwards, A.C.Edwards, A.C., Lovering, J.F., Ferguson, J.high pressure BASIC INCLUSIONS from the KAYRUNNERA KIMBERLITIC DIATREME in NEW SOUTH WALES, AUSTRALIA.Contributions to Mineralogy and Petrology, Vol. 69, PP. 185-192.Australia, New South WalesKimberlite, Xenoliths
DS1986-0316
1986
Edwards, A.C.Gunn, M.J., Edwards, A.C., Paterson, D.A., Ringenbergs, W.H.Origin of the Casurain a alluvial diamonds, western AustraliaProceedings of the Fourth International Kimberlite Conference, Held Perth, Australia, No. 16, pp. 463-465AustraliaDiamond exploration
DS1860-0103
1870
Edwards, A.M.Edwards, A.M.Note on ItacolumiteLyc. Nat. Hist. Proceedings, Vol. 1, PP. 33-36.United StatesGeology
DS1991-0683
1991
Edwards, B.R.Hausel, W.D., Edwards, B.R., Graff, P.J.Geology and mineralization of the Wyoming ProvinceAmerican Institute of Mining, Metallurgical, and Petroleum Engineers (AIME) Preprint, No. 91-72, 12pWyomingBreif mention -diamonds, Overview geology
DS1996-0410
1996
Edwards, B.R.Edwards, B.R., Russell, J.K.Influence of magmatic assimilation on mineral growth and zoningCanadian Mineralogist, Vol. 34, pt. 6, Dec. pp. 1149-62GlobalMagma, Petrology - experimental
DS1997-0309
1997
Edwards, B.R.Edwards, B.R., Kopylova, M.G., Russell, J.K.Petrology of the lithosphere beneath the northern CordilleraLithoprobe Slave/SNORCLE., pp. 129-142.British ColumbiaXenoliths
DS1998-0381
1998
Edwards, B.R.Edwards, B.R., Russell, J.K.Time scales of magmatic processes: new insights from dynamic models for magmatic assimilation.Geology, Vol. 26, No. 12, Dec. pp. 1103-6.MantleMagmatism, Forward model for dynamic AFC.
DS1999-0190
1999
Edwards, B.R.Edwards, B.R., Russell, J.K.Northern Cordilleran volcanic province: a northern Basin and Range?Geology, Vol. 27, 3, Mar. pp. 243-6.British ColumbiaVolcanics, magmatism, mantle plume, rifting, Alkaline rocks, East African Rift
DS2000-0263
2000
Edwards, B.R.Edwards, B.R., Russell, J.K.Distribution, nature and origin of Neogene Quaternary magmatism in the Northern Cordilleran volcanic ProvinceGeological Society of America (GSA) Bulletin., Vol. 112, No., Aug., pp. 1280-95.British Columbia, CordilleranAlkaline basalt, Magmatism
DS2000-0837
2000
Edwards, B.R.Roughley, C.E., Edwards, B.R., Russell, J.K.Crustal derived xenoliths from Prindle volcano, Alaska: implications for the lithospheric stratigraphy....Geological Association of Canada (GAC)/Mineralogical Association of Canada (MAC) 2000, 2p. abstract.AlaskaTerrane - Yukon-Tanana, Xenoliths
DS2000-0846
2000
Edwards, B.R.Russell, J.K., Edwards, B.R.Petrological imaging of the mantle lithosphere beneath the Northern Canadian Cordillera.Geological Society of America (GSA) Abstracts, Vol. 32, No. 7, p.A-387.British Columbia, CordilleraPetrology - xenoliths
DS200912-0200
2009
Edwards, B.R.Edwards, B.R., Russell, J.K.Xenoliths as magmatic 'menthos'.GAC/MAC/AGU Meeting held May 23-27 Toronto, Abstract onlyTechnologyTransportation - magma
DS202002-0188
2019
Edwards, B.R.Ghent, E.D., Edwards, B.R., Russell, J.K.Pargasite bearing vein in spinel lherzolite from the mantle lithosphere of the North American Cordillera. Canadian Journal of Earth Sciences, Vol. 56, pp. 870-885.Canada, British Columbialherzolite

Abstract: Basanite lavas near Craven Lake, British Columbia, host a spinel lherzolite xenolith containing cross-cutting veins with pargasitic amphibole (plus minor apatite). The occurrence of vein amphibole in spinel lherzolite is singular for the Canadian Cordillera. The vein crosscuts foliated peridotite and is itself cut by the basanite host. The amphibole is pargasite, which is the most common amphibole composition in mantle peridotite. Rare earth element concentrations in the pargasite are similar to those for mafic alkaline rocks across the northern Cordilleran volcanic province (light rare earth elements ~50× chondrite and heavy rare earth elements ~5× chondrite). Two-pyroxene geothermometry suggests that the vein and host peridotite were thermally equilibrated prior to sampling by the basanite magma. Calculated temperature conditions for the sample, assuming equilibration along a model steady-state geotherm, are between 990 and 1050 °C and correspond to a pressure of 0.15 GPa (~52 ± 2 km depth). These conditions are consistent with the stability limits of mantle pargasite in the presence of a fluid having XH2O < ~0.1. The pargasite vein and associated apatite provide direct evidence for postaccretion fracture infiltration of CO2-F-H2O-bearing silicate fluids into the Cordilleran mantle lithosphere. Pargasite with low aH2O is in equilibrium with parts per million concentrations of H2O in mantle olivine, potentially lowering the mechanical strength of the lithospheric mantle underlying the Cordillera and making it more susceptible to processes such as lithospheric delamination. Remelting of Cordilleran mantle lithosphere containing amphibole veins may be involved in the formation of sporadic nephelinite found in the Canadian Cordillera.
DS1960-0337
1963
Edwards, C.B.Edwards, C.B., Dribble, C.D., Mcbride, B., Roger, T.H.Prospecting for Diamonds in Tanganyika 1959-1961United Nations Report, UNPUBL.Tanzania, East AfricaGeology
DS1960-0660
1966
Edwards, C.B.Edwards, C.B., Howkins, J.B.Kimberlites in Tanganyika with Special Reference to the Mwadui Occurrence.Economic Geology, Vol. 61, PP. 537-554.Tanzania, East AfricaGeology
DS1970-0508
1972
Edwards, C.B.Edwards, C.B.The Systematic Sampling of the Kimberlite Body 2125 A/k 1 At Orapa, Botswana.Anglo American South Africa Ltd. Final Report, Vol. 1, 4P. (UNPUBL.)BotswanaKimberlite, Diamond Prospecting
DS1993-0393
1993
Edwards, C.M.H.Edwards, C.M.H., Morris, J.D., Thirlwall, M.F.Separating mantle from slab signatures in arc lavas usig Boron/Berylium and radiogenic isotope systematicsNature, Vol. 362, April 8, pp. 530-533MantleSubduction, Magma chemistry
DS1991-0424
1991
Edwards, D.Edwards, D., Rock, N.M.S., Taylor, W.R., Griffin, B.J., Sun, S-S.The Aries Diamondiferous kimberlite pipe, central Kimberley block, westernAustralia: mineralogy, petrology and geochem. of the pipe rock and indicatorsProceedings of Fifth International Kimberlite Conference held Araxa June 1991, Servico Geologico do Brasil (CPRM) Special, pp. 82-84AustraliaMicaceous kimberlite, Group II, Geochemistry
DS1992-0412
1992
Edwards, D.Edwards, D., Rock, N.M.S., Taylor, W.R., Griffin, B.J.Mineralogy and petrology of the Aries Diamondiferous kimberlite pipe, central Kimberley block, western AustraliaJournal of Petrology, Vol. 33, No. 5, October pp. 1157-1191AustraliaKimberlite, Deposit -Aries
DS1994-1437
1994
Edwards, D.Ramsay, R.R., Edwards, D., Taylor, W.R., Rock, N.M.S., Griffin, B.J.Compositions of garnet, spinel Aries Diamondiferous kimberlite pipe, Kimberley Block, implications for explJournal of Geochem. Exploration, Vol. 51, No. 1, Apr. pp. 59-78.AustraliaGeochemistry, Deposit -Aries
DS2001-0852
2001
Edwards, D.Olson, R., Edwards, D., Berezniuk, T.The search continues for Diamondiferous kimberlites in AlbertaProspectors and Developers Association of Canada (PDAC) Exploration and development Highlights, pp. 19, 22.AlbertaKimberlites, Exploration - discoveries
DS200612-1010
2006
Edwards, D.Olson, R., Eccles, D.R., Pana, D., Edwards, D., Beaton,A., Maslowski, A.Summary of mineral exploration during 2005, Diamondiferous kimberlites ( 2p.)Alberta Geological Survey, Jan. 20, 2p.Canada, AlbertaNews item - exploration activity
DS201903-0503
2019
Edwards, D.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.
DS1990-0566
1990
Edwards, D.E.Gibson, D.W., Edwards, D.E.An overview of Triassic stratigraphy and depositional environments in the Rocky Mountain foothills and western interior plains, Peace River Arch regionGeology of the Peace River Arch, ed. Sc.C. O'Connell, J.S. Bell, Bulletin. Can., Vol. 38A, Special Volume, December pp. 146-158AlbertaPeace River area, Tectonics, structure
DS1999-0191
1999
Edwards, D.J.Edwards, D.J., Brown, J.R.Understanding the influence of Precambrian crystalline basement on Upper Devonian carbonates central AlbertaLithoprobe, No. 47, pp. 412-38.AlbertaGeophysics - magnetics not specific to diamonds
DS1860-0985
1897
Edwards, E.Edwards, E.A Journey through South AfricaLiverpool: C. Tingley And Co., 122P.Africa, South AfricaTravelogue
DS1920-0091
1921
Edwards, E.C.Twenhofel, W.H., Edwards, E.C.The Metamorphic Rocks of Woodson County, KansasAmerican Association of Petroleum Geologists, Vol. 5, No. 1, PP. 64-74.KansasKimberlite, Central States, Wilson, Woodson
DS1992-0269
1992
Edwards, G.Collins, D., Hutchinson, R., Edwards, G.Can the mining industry successfully show that it is environmentallyaware?Australian Institute of Mining and Metallurgy (AusIMM) Bulletin, No. 7, December pp. 73-75AustraliaMining, Environmental
DS1991-0425
1991
Edwards, G.R.Edwards, G.R., Hodder, R.W.A semi-quantitative model for fractionation of rhyolite from rhyodacite in a compositionally altered Archean volcanic complex, Superior Province, CanadaPrecambrian Research, Vol. 50, No. 1-2. April pp. 49-67OntarioGeochronology, Geochemistry, petrography
DS1990-1558
1990
Edwards, H.E.Williams, E.A., Ford, M., Edwards, H.E.Discussion of a model for the development of the Irish VariscadesJournal of the Geological Society of London, Vol. 147, pt. 3, May pp. 566-571IrelandTectonics
DS2000-0264
2000
Edwards, J.D.Edwards, J.D.Exploration success in North America.... Star Resources activities at American Mine.World Diamond Conference Toronto June 19-20, 13p. slidesArkansasNews item, Star Resources - promotional literature
DS1981-0147
1981
Edwards, J.S.Edwards, J.S.The Petrology and Contact Relationships of the Southwestern portion of the Precambrian Mullen Creek Mafic Complex Medicine Bow Mountains, wyoming.Geological Society of America (GSA), Vol. 13, No. 4, P. 195, (abstract.).United States, Wyoming, Rocky Mountains, Medicine Bow MountainsBlank
DS1998-0073
1998
Edwards, K.J.Banfield, J.F., Welch, S.A., Edwards, K.J.Microbes as geochemical agentsThe Geochemical News, No. 96, July pp. 11-17GlobalWeathering, Geochemistry - Microbial roles
DS201112-1119
2011
Edwards, L.Woodhead, J., Hergt, J., Greig, A., Edwards, L.Subduction zone Hf anomalies: mantle messenger, melting artefact or crustal process?Earth and Planetary Science Letters, Vol. 304, 1-2, pp. 231-239.MantleSubduction
DS1960-1097
1969
Edwards, N.Edwards, N., Gratton-Bellew, P.Report on the Coral Rapids Investigation for Selection Trust Exploration Limited, Section Diamonds.Ontario Department of Mines, ASSESSMENT WORK FILE., No. 2.133, 15P. DECEMBER.Canada, OntarioGeochemistry, Sampling, Prospecting
DS1970-0073
1970
Edwards, N.Edwards, N.The Orange River Past and PresentSelection Trust Exploration Files, South AfricaBlank
DS201412-0219
2014
Edwards, P.Edwards, P., Lee, M.Cathodluminescence hyper spectral imaging in geoscience.GAC/MAC short Course, MayTechnologyCathodluminescence
DS1970-0074
1970
Edwards, R.Edwards, R.Geology and Sampling of the Mwadui MineMwadui Eng. Association Journal, P. 1.Tanzania, East AfricaEvaluation, Sampling, Geology
DS1986-0206
1986
Edwards, R.Edwards, R., Atkinson, K.Ore deposit geology-textChapman Hall, pp. 54-62 kimberlites, pp. 175-213 placers and paleoplaGlobalOverview
DS1998-0380
1998
Edwards, R.Edler, E., Winter, F., Edwards, R.The Rosario do Sul kimberlitic province, Rio Grande do Sul State, SouthernBrasil.7th International Kimberlite Conference Abstract, pp. 202-204.Brazil, Grande do SulPetrography, Deposit - Rosario
DS1995-0483
1995
Edwards, S.J.Edwards, S.J., Malpas, J.Multiple origins for mantle harzburgites: examples from the Lewis Hills, Bay of Islands ophiolite.Canadian Journal of Earth Sciences, Vol. 32, No. 7, July pp. 1046-1057.NewfoundlandHarzburgites
DS200412-0355
2004
Edwards, S.J.Coogan, L.A., Thompson, G.M., MacLeod, C.J., Dick, H.J., Edwards, S.J., Hosford Scierer, A., Barry, T.L.A combined basalt and peridotite perspective on 14 million years of melt generation at the Atlantis Bank segment of the southwesChemical Geology, Vol. 207, 1-2, pp. 13-30.IndiaMantle dynamics, tectonics
DS201507-0310
2015
Edwards, S.J.Edwards, S.J., Schellart, W.P., Duarte, J.C.Geodynamic models of continental subduction and obduction of overriding plate forearc oceanic lithosphere on top of continental crust.Tectonics, Vol. 34, 7, pp. 1494-1515.New ZealandSubduction
DS1990-1046
1990
Edwards, W.A.D.Millard, M.J., Simpson, M.A., Schreiner, B.T., Edwards, W.A.D.Near surface mineral potential of the plains of Western Canada, with special reference to SaskatchewanModern Exploration Techniques, editors L.S. Beck, C.T. Harper, Saskatchewan, pp. 168-178SaskatchewanIndustrial minerals, Database
DS1993-0394
1993
Edwards, W.A.D.Edwards, W.A.D., Boisvert, D.R.Tertiary (preglacial) gravel formations -an aggregate and placer gold resource of heavy mineral indicator dataThe Canadian Mining and Metallurgical Bulletin (CIM Bulletin) , Annual Meeting Abstracts approximately 10 lines, Vol. 86, No. 968, March POSTER ABSTRACT p. 68AlbertaGeomorphology, Mineral chemistry
DS1996-0411
1996
Edwards, W.A.D.Edwards, W.A.D., Scafe, D.W.The stratigraphy and occurrence of preglacial gravels in AlbertaCalgary Mining Forum Fifth Held April 11, 12., p. 10. abstractAlbertaGeomorphology, Diamond overview
DS1993-0395
1993
Edwards. C.M.H.Edwards. C.M.H., Morris, J.D., Thirlwall, M.F.Seperating mantle from slab signatures in arc lavas using Boron-Berylium and radiogenic isotope systematicsNature, Vol. 362, No. 6420, April 8, pp. 530-534MantleGeochronology, Subduction
DS1984-0268
1984
EeadeFahrig, W.F., Christie, Eeade, TellaPaleomagnetism of the Tulemalu Dikes, Northwest TerritoriesCanadian Journal of Earth Sciences, Vol. 21, pp. 544-53.Northwest TerritoriesGeophysics - Magnetics
DS200612-0996
2006
Eeckhout, S.G.Oberti, R., Quartieri, S., Dalconi, M.C., Boscherini, F., Iezzi, G., Boiocchi, M., Eeckhout, S.G.Site preference and local geometry of Sc in garnets: part 1. multifarious mechanisms in the pyrope-grossular join.American Mineralogist, Vol. 91, 9, pp. 1230-1239.TechnologyMineral chemistry - garnets
DS201805-0944
2018
Eeken, T.Eeken, T., Goes, S., Pedersen, H.A., Arndt, N.T., Bouilhol, P.Seismic evidence for depth dependent metasomatism in cratons.Earth Planetary Science Letters, Vol. 491, pp. 148-159.Africa, Australia, Canada, Europegeothermometry

Abstract: The long-term stability of cratons has been attributed to low temperatures and depletion in iron and water, which decrease density and increase viscosity. However, steady-state thermal models based on heat flow and xenolith constraints systematically overpredict the seismic velocity-depth gradients in cratonic lithospheric mantle. Here we invert for the 1-D thermal structure and a depth distribution of metasomatic minerals that fit average Rayleigh-wave dispersion curves for the Archean Kaapvaal, Yilgarn and Slave cratons and the Proterozoic Baltic Shield below Finland. To match the seismic profiles, we need a significant amount of hydrous and/or carbonate minerals in the shallow lithospheric mantle, starting between the Moho and 70 km depth and extending down to at least 100-150 km. The metasomatic component can consist of 0.5-1 wt% water bound in amphibole, antigorite and chlorite, ~0.2 wt% water plus potassium to form phlogopite, or ~5 wt% CO2 plus Ca for carbonate, or a combination of these. Lithospheric temperatures that fit the seismic data are consistent with heat flow constraints, but most are lower than those inferred from xenolith geothermobarometry. The dispersion data require differences in Moho heat flux between individual cratons, and sublithospheric mantle temperatures that are 100-200?°C less beneath Yilgarn, Slave and Finland than beneath Kaapvaal. Significant upward-increasing metasomatism by water and CO2-rich fluids is not only a plausible mechanism to explain the average seismic structure of cratonic lithosphere but such metasomatism may also lead to the formation of mid-lithospheric discontinuities and would contribute to the positive chemical buoyancy of cratonic roots.
DS201904-0761
2019
EeroNicklas, R.W., Puchtel, I.S., Ash, R.D., Piccoli, P.M., Hanski, M., Eero, Nisbet, E.G., Waterton, P., Pearson, D.G., Anbar, A.D.Secular mantle oxidation across the Archean - Proterozoic boundary: evidence from V partitioning in komatiites and picrites.Geochimica et Cosmochimica Acta, Vol. 250, 1, pp. 49-75.Mantlepicrites

Abstract: The oxygen fugacities of nine mantle-derived komatiitic and picritic systems ranging in age from 3.55?Ga to modern day were determined using the redox-sensitive partitioning of V between liquidus olivine and komatiitic/picritic melt. The combined set of the oxygen fugacity data for seven systems from this study and the six komatiite systems studied by Nicklas et al. (2018), all of which likely represent large regions of the mantle, defines a well-constrained trend indicating an increase in oxygen fugacity of the lavas of ~1.3 ?FMQ log units from 3.48 to 1.87?Ga, and a nearly constant oxygen fugacity from 1.87?Ga to the present. The oxygen fugacity data for the 3.55?Ga Schapenburg komatiite system, the mantle source region of which was previously argued to have been isolated from mantle convection within the first 30?Ma of the Solar System history, plot well above the trend and were not included in the regression. These komatiite’s anomalously high oxygen fugacity data likely reflect preservation of early-formed magma ocean redox heterogeneities until at least the Paleoarchean. The observed increase in the oxygen fugacity of the studied komatiite and picrite systems of ~1.3 ?FMQ log units is shown to be a feature of their mantle source regions and is interpreted to indicate secular oxidation of the mantle between 3.48 and 1.87?Ga. Three mechanisms are considered to account for the observed change in the redox state of the mantle: (1) recycling of altered oceanic crust, (2) venting of oxygen from the core due to inner core crystallization, and (3) convection-driven homogenization of an initially redox-heterogeneous primordial mantle. It is demonstrated that none of the three mechanisms alone can fully explain the observed trend, although mechanism (3) is best supported by the available geochemical data. These new data provide further evidence for mantle involvement in the dramatic increase in the oxygen concentration of the atmosphere leading up to the Great Oxidation Event at ~2.4?Ga.
DS1997-0320
1997
Efimov, A.V.Erinchek, Yu.M., Milshtein, E.D., Efimov, A.V., ParsotkaExploration for primary diamond deposits by geophysical methodsPapunen: 4th. Biennial SGA Meeting, pp. 759-761.RussiaDiamond exploration, Geophysics
DS2000-0006
2000
EfimovaAfanasev, V.P., Pokhilenko, Loginova, Zinchuk, EfimovaProblem of false kimberlite indicators: a new morphogenetic type Cr spinellide Diamondiferous areas.Russian Geology and Geophysics, Vol.41,12,pp.1676-89., Vol.41,12,pp.1676-89.RussiaGeochemistry - indicators, Chrome spinellide
DS2000-0007
2000
EfimovaAfanasev, V.P., Pokhilenko, Loginova, Zinchuk, EfimovaProblem of false kimberlite indicators: a new morphogenetic type Cr spinellide Diamondiferous areas.Russian Geology and Geophysics, Vol.41,12,pp.1676-89., Vol.41,12,pp.1676-89.RussiaGeochemistry - indicators, Chrome spinellide
DS1980-0052
1980
Efimova, E.S.Bartoshininskii, A.V., Efimova, E.S., ZhikharevaThe Crystal Morphology of Garnet Inclusions in Natural DiamondsRussian Geology and Geophysics, Vol. 21, No. 3, pp. 9-17.RussiaDiamond Inclusions - Garnet
DS1981-0387
1981
Efimova, E.S.Sobolev, N.V., Efimova, E.S., Pospelova, L.N.Native Iron in Diamonds of Yakutiya and Its ParagenesisSoviet Geology And Geophysics, Vol. 22, No. 12, PP. 18-21.RussiaKimberlite, Inclusion, Crystallography
DS1982-0500
1982
Efimova, E.S.Pokhilenko, N.P., Sobolev, N.V., Efimova, E.S.Xenolith of Cataclazed Diamond Bearing Disthenic Eclogite from the Pipe 'udachnaia' Yakutia.Doklady Academy of Sciences AKAD. NAUK SSSR., Vol. 266, No. 1, PP. 212-216.RussiaBlank
DS1984-0692
1984
Efimova, E.S.Sobolev, N.V., Efimova, E.S., Lavrentiev, I.G., Sobolev, V.S.Predominating Calc-silicate Association of Crystalline Inclusions in Diamonds from the South Australia Placers.Doklady Academy of Sciences AKAD. NAUK SSSR., Vol. 274, No. 1, PP. 172-179.Australia, South AustraliaAlluvial Diamond Deposits, Mineralogy
DS1984-0693
1984
Efimova, E.S.Sobolev, N.V., Pokhilenko, N.P., Efimova, E.S.Diamond Bearing Peridotite Xenoliths in Kimberlites and The problem of the Origin of Diamonds.Soviet Geology And Geophysics, Vol. 25, No. 12, PP. 62-76.RussiaGenesis
DS1984-0694
1984
Efimova, E.S.Sobolev, N.V., Pokhilenko, N.P., Efimova, E.S.Xenoliths of Diamond Bearing Peridotites in Kimberlites And the Problem of Diamonds Origin.Geologii i Geofiziki, No. 12, (300) DECEMBER PP. 63-RussiaGenesis, Petrography
DS1989-0393
1989
Efimova, E.S.Efimova, E.S., Zakharchenko, O.D., Sobolev, N.V., Makhin, A.I.Inclusions in diamonds from a kimberlite pipe.(Russian)Zap. Vses. Mineral. O-Va, (Russian), Vol. 118, No. 2, pp. 74-76RussiaDiamond morphology, Diamond inclusions
DS1993-0767
1993
Efimova, E.S.Kadik, A.A., Zharkova, E.V., Efimova, E.S., Sobolev, N.V.Electrochemical determination of intrinsic oxygen fugacity of diamondcrystals. (Russian)Doklady Academy of Sciences Akademy Nauk SSSR, (Russian), Vol. 328, No. 3, January pp. 386-389Russia, Commonwealth of Independent States (CIS), YakutiaDiamond morphology
DS1993-1498
1993
Efimova, E.S.Sobolev, N.V., Galimov, E.M., Efimova, E.S., Sobolev, E.V.Crystalline inclusions, isotopes carbon, nitrogen centers in diamonds, features of garnet from Madjgawan.Russian Geology and Geophysics, Vol. 34, No. 12, pp. 77-83.IndiaDiamond inclusions, Deposit -Madjgawan
DS1997-0568
1997
Efimova, E.S.Kadik, A.A., Zharkova, E.V., Efimova, E.S., Sobolev, N.Redox conditions of the formation of diamond crystals: electrochemicalinvestigations.Doklady Academy of Sciences, Vol. 355A, No. 6, July-Aug. pp. 1370-74.GlobalDiamond morphology, Crystallography
DS1998-1370
1998
Efimova, E.S.Sobolev, N.V., Efimova, E.S.Compositional variations of chromite inclusions as an indicator of the zonation of diamond crystals.Doklady Academy of Sciences, Vol. 359, No. 2, pp. 163-166.GlobalDiamond inclusions, Chromite
DS2000-0816
2000
Efimova, E.S.Reutskii, V.N., Efimova, E.S., Sobolev, N.V.Isotopic composition of carbon in polycrystalline aggregates of diamond with inclusions of garnet/rutileRussian Geology and Geophysics, Vol.41,12,pp.1690-6., Vol.41,12,pp.1690-6.Russia, YakutiaDiamond inclusions, Deposit - Mir
DS2000-0817
2000
Efimova, E.S.Reutskii, V.N., Efimova, E.S., Sobolev, N.V.Isotopic composition of carbon in polycrystalline aggregates of diamond with inclusions of garnet/rutileRussian Geology and Geophysics, Vol.41,12,pp.1690-6., Vol.41,12,pp.1690-6.Russia, YakutiaDiamond inclusions, Deposit - Mir
DS2001-1096
2001
Efimova, E.S.Sobolev, N.V., Efimova, E.S., Loginova, SukhodolskayaAbundance and composition of mineral inclusions in large diamonds from Yakutia.Doklady Academy of Sciences, Vol. 376, No. 1, Jan-Feb. pp. 34-8.Russia, YakutiaDiamond - inclusions
DS201012-0735
2009
Efimova, E.S.Sobolev, N.V., Logvinova, A.M., Efimova, E.S.Syngenetic phlogopite inclusions in kimberlite hosted diamonds: implications for role of volatiles in diamond formation.Russian Geology and Geophysics, Vol. 50, 12, pp. 1234-1248.MantleDiamond genesis
DS201412-0862
2013
Efimova, E.S.Sobolev, N.V., Logvinova, A.M., Efimova, E.S.Inclusions of Mn-rich eclogitic garnets in diamonds: evidence for recycling of the Earth's crust.Doklady Earth Sciences, Vol. 451, 1, pp. 1165-1167.TechnologyDiamond morphology
DS201911-2565
2019
Efimova, E.S.Soboelev, N.V., Logvinova, A.M., Tomilenko, A.A., Wirth, R., Bulbak, T.A., Lukyanova, L.I., Fedorova, E.N., Reutsky, V.N., Efimova, E.S.Mineral and fluid inclusions in diamonds from the Urals placers, Russia: evidence for solid molecular N2 and hydrocarbons in fluid inclusions.Geochimica et Cosmochimica Acta, Vol. 266, pp. 197-212.Russia, Uralsdiamond inclusions

Abstract: The compositions of mineral inclusions from a representative collection (more than 140 samples) of diamonds from the placer deposits in the Ural Mountains were studied to examine their compositional diversity. The overwhelming majority of rounded octahedral and dodecahedral stones typical of placers contain eclogitic (E-type) mineral inclusions (up to 80%) represented by garnets with Mg# 40-75 and Ca# 10-56, including the unique high calcic “grospydite” composition, omphacitic pyroxenes containing up to 65% of jadeite, as well as kyanite, coesite, sulfides, and rutile. Peridotitic (P-type) inclusions are represented by olivine, subcalcic Cr-pyrope, chrome diopside, enstatite and magnesiochromite that are typical for diamonds worldwide. Comparing the chemical composition of olivine, pyrope and magnesiochromite in diamonds of the Urals, north-east of the Siberian platform placers and Arkhangelsk province kimberlites show striking similarity. There are significant differences only in the variations of carbon isotopic composition of the diamonds from the placers of the Urals and north-east of the Siberian platform. One typical rounded dodecahedral diamond was found to contain abundant primary oriented submicrometer-sized (<3.0?µm) octahedral fluid inclusions identified by transmission electron microscopy, which caused the milky color of the entire diamond crystal. The electron energy-loss spectrum of a singular inclusion has a peak at ~405?eV, indicating that nitrogen is present. The Raman spectra with peaks at 2346-2350?cm-1 confirmed that nitrogen exists in the solid state at room temperature. This means that fossilized pressure inside fluid inclusions may be over 6.0 GPa at room temperature, so the diamond may be considered sublithospheric in origin. However, identification of unique fluid inclusions in one typical placer diamond allows one to expand the pressure limit to at least more than 8.0 GPa. The volatile components of four diamonds from the Urals placers were analyzed by gas chromatography-mass spectrometry (GC-MS). They are represented (rel. %) by hydrocarbons and their derivatives (14.8-78.4), nitrogen and nitrogenated compounds (6.2-81.7), water (2.5-5.5), carbon dioxide (2.8-12.1), and sulfonated compounds (0.01-0.96). It is shown that high-molecular-weight hydrocarbons and their derivatives, including chlorinated, nitrogenated and sulfonated compounds, appear to be stable under upper mantle P-T conditions. A conclusion is drawn that Urals placer diamonds are of kimberlitic origin and are comparable in their high E-type/P-type inclusion ratios to those from the northeastern Siberian platform and in part to diamonds of the Arkhangelsk kimberlite province.
DS1994-0954
1994
Efremov, V.H.Kropotkin, P.N., Efremov, V.H.New proofs of plate tectonic theoryGeotectonics, Vol. 28, No. 1, August pp. 13-19RussiaTectonics
DS1995-1250
1995
Egal, E.Milesi, J-P, Egal, E., Ledru, P., Vernhet, Y et al.Les mineralisations du Nord de la Guyana francaise dans leur cadregeologique.Chron. Recherche Min., No. 518, pp. 5-58.French GuianaGeology -3 p. english summary general geology, Metallogeny - mainly gold related
DS1992-0413
1992
Egan, M.J.Egan, M.J., Ashley, P.M.The Devils Chimney breccia pipe, Dyamberin area, northeastern New SouthWalesAustralian Journal of Earth Sciences, Vol. 39, pp. 239-247Australia, New South WalesNephelinite, Geochemistry
DS1993-0396
1993
Egan, S.S.Egan, S.S., Urquhart, J.M.Numerical modelling of lithosphere shortening: application to the Laramide orogenic province, western USATectonophysics, Vol. 221, pp. 385-411WyomingTectonics, Orogeny
DS1998-0625
1998
Egan, S.S.Hodgetts, D., Egan, S.S., Williams, G.D.Flexural modelling of continental lithosphere deformation: a comparison of2D and 3D techniques.Tectonophysics, Vol. 294, No. 1-2, Aug. 30, pp. 1-20.MantleLithosphere - model
DS201412-0572
2014
Egbert, G.D.Meqbel, N.M., Egbert, G.D., Wannamaker, P.E., Kelbert, A., Schultz, A.Deep electrical resistivity structure of the northwestern US derived from 3-D inversion of USArray magnetotelluric data.Earth and Planetary Science Letters, Vol. 402, pp. 290-304.United StatesGeophysics - magnetotellurics
DS1997-0310
1997
Egenhofer, M.I.Egenhofer, M.I., Golledge, R.G.Spatial and temporal reasoning in geographic information systemsOxford, 320p. approx. $ 60.00GlobalBook - ad, GIS systems
DS1981-0105
1981
Egerton, R.F.Bursill, L.A., Egerton, R.F., Thomas, J.M., Pennycook, S.High Resolution Imaging and Electron Energy Loss Studies Of platelet Defects in Diamond.Faraday Transactions, 2ND. SERIES, Vol. 77, No. 8, PP. 1367-1373.GlobalDiamond, Natural
DS1997-0311
1997
Eggenkamp, H.G.M.Eggenkamp, H.G.M., Van Groos, A.F.K.Chlorine stable isotopes in carbonatites: evidence for isotopic heterogeneity in the mantle. #1Chemical Geology, Vol. 140, No. 1-2, July 15, pp. 137-144.MantleCarbonatite, Geochronology
DS1998-0382
1998
Eggenkamp, H.G.M.Eggenkamp, H.G.M., Koster van Groos, A.F.Chlorine stable isotopes in carbonatites: evidence for isotopic heterogeneity in the mantle. #2Chemical Geology, Vol. 140, pp. 137-143.MantleCarbonatite, Geochronology
DS1993-0397
1993
Eggert, R.G.Eggert, R.G.Managing for successful mineral exploration: a reviewResources Policy, Vol. 19, No. 3, September pp. 173-176GlobalEconomics, Mineral exploration -management
DS1994-0486
1994
Eggert, R.G.Eggert, R.G.The next twenty yearsResources Policy, Vol. 20, No. 1, March pp. 3-4Global, United StatesEconomics, Forecast
DS1996-1501
1996
Eggert, R.G.Walls, M.R., Eggert, R.G.Managerial risk taking: a study of mining CEOsMining Engineering, Vol. 48, No. 3, March pp. 61-67Australia, GlobalEconomics, Risk taking, strategic investments
DS1994-0575
1994
Eggins, S.Garda, G., Eggins, S.Trace element characteristics of the lamprophyric dykes from the north coast of Sao Paulo State, Brasil.International Symposium Upper Mantle, Aug. 14-19, 1994, pp. 106-107.BrazilDike, Geochemistry
DS1995-1873
1995
Eggins, S.Tatsumi, Y., Eggins, S.Subduction zone magmatismBlackwell Scientific, 210p. approx. $ 60.00GlobalBook - table of contents, Magma -subduction
DS2001-0242
2001
Eggins, S.Degeling, H., Eggins, S., Ellis, D.J.Zirconium budgets for metamorphic reactions and the formation of zircon from garnet breakdown.Mineralogical Magazine, Vol. 65, No. 6, pp. 749-58.GlobalMineralogy - garnet
DS2001-1251
2001
Eggins, S.Woodhead, J.D., Hergt, J.M., Davidson, J.P., Eggins, S.Hafnium isotope evidence for conservative element mobility during subduction zone processes.Earth and Planetary Science Letters, Vol. 192, No. 3, pp. 331-46.MantleGeochronology, Subduction
DS1995-1054
1995
Eggins, S.M.Lanyon, R., Crawford, A.J., Eggins, S.M.Westward migration of Pacific Ocean upper mantle into Southern Ocean region between Australia and AntarcticaGeology, Vol. 23, No. 6, June pp. 511-514.Australia, AntarcticaTectonics, discordance, mantle, Geochronology
DS2001-0407
2001
Eggins, S.M.Green, D.H., Falloon, T.J., Eggins, S.M., Yaxley, G.M.Primary magmas and mantle temperaturesEuropean Journal of Mineralogy, Vol. 13, No. 3, pp. 437-51.MantleMagmatism, Melting, subduction, slabs, hotspots
DS2002-0805
2002
Eggins, S.M.Kamenetsky, V.S., Sobolev, A.V., Eggins, S.M., CrawfordOlivine enriched melt inclusions in chromites from low Ca boninites, Cape Vogel: ultramafic primary magmaChemical Geology, Vol.183, 1-4, pp.287-303.Papua New GuineaMagma - refractory mantle source and enriched component, sub calcic, Geochemistry
DS2003-1348
2003
Eggins, S.M.Sun, W., Bennett, V.C., Eggins, S.M., Kamenetsky, V.S., Arculus, R.J.Enhanced mantle to crust rhenium transfer in under gassed arc magmasNature, No. 6929, March 20, pp. 294-6.MantleGeochemistry
DS2003-1492
2003
Eggins, S.M.Witt Eickschen, G., Seck, H.A., Mezger, K., Eggins, S.M., Altherr, R.Lithospheric mantle evolution beneath the Eifel ( Germany): constraints from Sr Nd PbJournal of Petrology, Vol. 44, 6, pp. 1077-96.GermanyMineral chemistry
DS200412-2138
2003
Eggins, S.M.Witt Eickschen, G., Seck, H.A., Mezger, K., Eggins, S.M., Altherr, R.Lithospheric mantle evolution beneath the Eifel ( Germany): constraints from Sr Nd Pb isotopes and trace element abundances in sJournal of Petrology, Vol. 44, 6, pp. 1077-96.Europe, GermanyGeochronology Mineral chemistry
DS200812-1142
2008
Eggins, S.M.Sun, W., Kamentesky, V.S., Eggins, S.M., Chen, M., Arculus, R.J.Constancy of NB/U in the mantle revisited.Geochimica et Cosmochimica Acta, Vol. 72, 14, pp. 3542-3549.MantleMorb chemistry
DS1986-0710
1986
Eggler, D.E.Schneider, M.E., Eggler, D.E.Fluids in equilibrium with peridotite minerals: implications for mantleMetasomatismGeochimica et Cosmochimica Acta, Vol. 50, pp. 711-724GlobalMantle, Metasomatism
DS1960-0823
1967
Eggler, D.H.Eggler, D.H.Structure and Petrology of the Virginia Dale Ring Dike Complex Colorado-Wyoming Front Range.Ph.d. Thesis, University Colorado, 153P.United States, Colorado, Wyoming, State Line, Rocky MountainsBlank
DS1960-0945
1968
Eggler, D.H.Eggler, D.H.Virginia Dale Precambrian Ring Dike Complex, Colorado-wyominGeological Society of America (GSA) Bulletin., Vol. 79, PP. 1545-1564.United States, Colorado, Wyoming, State Line, Rocky MountainsBlank
DS1960-0989
1968
Eggler, D.H.Mccallum, M.E., Eggler, D.H.Preliminary Report on Mineralogy of Kimberlite Diatremes In the Northern Front Range, Colorado-wyoming.Geological Society of America (GSA) SPECIAL PAPER., No. 121, P. 192, (abstract.).United States, Colorado, Wyoming, State Line, Rocky MountainsBlank
DS1960-1090
1969
Eggler, D.H.Chronic, J., Mccallum, M.E., Ferris, C.S.Jr., Eggler, D.H.Lower Paleozoic Rocks in Diatremes, Southern Wyoming and Northern Colorado.Geological Society of America (GSA) Bulletin., Vol. 80, PP. 149-155.United States, Colorado, Wyoming, Rocky Mountains, State LineDiatreme
DS1960-1098
1969
Eggler, D.H.Eggler, D.H., Larson, E., Bradley, W.E.Granites, Grusses and the Sherman Erosion Surface Southern Laramie Range, Colorado-wyoming.American Journal of Science, Vol. 267, No. 4, PP. 510-522.United States, Colorado, Wyoming, State Line, Rocky MountainsBlank
DS1970-0350
1971
Eggler, D.H.Mccallum, M.E., Eggler, D.H.Mineralogy of the Sloan Diatreme a Kimberlite Pipe in Northern Larimer County, Colorado.American Mineralogist., Vol. 56, SEPT.-Oct. No. 9-10, PP. 1735-1749.United States, Colorado, State Line, Rocky MountainsChemical Analyses, Petrography, Xenoliths, Microprobe
DS1970-0671
1973
Eggler, D.H.Eggler, D.H.Role of Co2 in Melting Processes in the MantleCarnegie Institute Yearbook, FOR 1972, PP. 457-467.GlobalResearch, Genesis, Carbonatite, Related Rocks
DS1970-0672
1973
Eggler, D.H.Eggler, D.H., Mccallum, M.E.Ultramafic Nodules from Colorado Wyoming Kimberlite PipesCarnegie Institute Yearbook, FOR 1972, PP. 446-449.United States, Colorado, Wyoming, State Line, Rocky MountainsPetrography, Mineral Chemistry, Diatreme, Front Range
DS1970-0761
1973
Eggler, D.H.Mccallum, M.E., Eggler, D.H., Burns, L.K.Kimberlitic Diatremes in Northern Colorado and Southern Wyoming #1International Kimberlite Conference FIRST EXTENDED ABSTRACT VOLUME., PP. 217-220.United States, Colorado, Wyoming, State Line, Rocky MountainsBlank
DS1970-0903
1974
Eggler, D.H.Eggler, D.H., Mccallum, M.E.Preliminary Upper Mantle Lower Crust Model of the Colorado Wyoming Front range.Carnegie Institute Yearbook, FOR 1973, PP. 295-300.United States, Colorado, Wyoming, State Line, Rocky MountainsBlank
DS1970-0904
1974
Eggler, D.H.Eggler, D.H., Mccallum, M.E.Colorado Wyoming Kimberlitic Diatremes ,pt. Ii, a View of The Upper Mantle from Nodules.Geological Society of America (GSA), Vol. 6, No. 5, P. 440, (abstract.).United States, Colorado, Wyoming, State Line, Rocky MountainsBlank
DS1970-0958
1974
Eggler, D.H.Mccallum, M.E., Eggler, D.H., Burns, L.K.Colorado Wyoming Kimberlitic Diatremes: Pt. I, General Geology and Petrography.Geological Society of America (GSA), Vol. 6, No. 5, P. 457, (abstract.).United States, Colorado, Wyoming, State Line, Rocky MountainsBlank
DS1975-0071
1975
Eggler, D.H.Eggler, D.H., Mccallum, M.E.A Field Test of Geothermometers and BarometersInternational Conference ON GEOTHERMOMETRY, EXTENDED ABSTRACTS, BOETTCH, 3P.United States, Colorado, Wyoming, Rocky MountainsBlank
DS1975-0072
1975
Eggler, D.H.Eggler, D.H., Mccallum, M.E.Diamond Bearing Peridotite Nodule in Wyoming Kimberlite PipeGeological Society of America (GSA), Vol. 7, No. 7, P. 1065, (abstract.).United States, Wyoming, State Line, Rocky MountainsBlank
DS1975-0131
1975
Eggler, D.H.Mccallum, M.E., Eggler, D.H., Burns, L.K.Kimberlitic Diatremes in Northern Colorado and Southern Wyoming #2Physics and Chemistry of the Earth, Vol. 9, PP. 149-161.United States, Colorado, Wyoming, State Line, Rocky MountainsBlank
DS1975-0132
1975
Eggler, D.H.Mccallum, M.E., Smith, C.B., Burns, L.K., Eggler, D.H., Braddoc.Kimberlite Diatremes and Others Iron Mountain Area, Laramierange, Wyoming.Geological Society of America (GSA), Vol. 7, No. 5, P. 628 (abstract.).United States, Wyoming, State Line, Rocky MountainsBlank
DS1975-0273
1976
Eggler, D.H.Eggler, D.H., Mccallum, M.E.A Geotherm from Megacrysts in the Sloan Kimberlite Pipes, ColoradoCarnegie Institute Yearbook, FOR 1975 PP. 538-541.United States, Colorado, State Line, Rocky MountainsBlank
DS1975-0274
1976
Eggler, D.H.Eggler, D.H., Mccallum, M.E., Smith, C.B.A Geotherm from Megacrysts in Colorado-Wyoming Kimberlite Pipes.Geological Society of America (GSA), Vol. 8, No. 6, P. 851, (abstract.).United States, Colorado, Wyoming, State Line, Rocky MountainsBlank
DS1975-0335
1976
Eggler, D.H.Mccallum, M.E., Eggler, D.H.Diamonds in an An Upper Mantle Peridotite Nodule from Kimberlite in Southern Wyoming.Science., Vol. 192, No. 4236, PP. 253-256.United States, Wyoming, State Line, Rocky MountainsBlank
DS1975-0414
1976
Eggler, D.H.Smith, C.B., Mccallum, M.E., Eggler, D.H.Clinopyroxene Ilmenite Intergrowths from the Iron Mountain kimberlite District, Wyoming.Carnegie Institute Yearbook, FOR 1975 PP. 542-544.United States, Colorado, Wyoming, State Line, Rocky MountainsBlank
DS1975-0415
1976
Eggler, D.H.Smith, C.B., Mccallum, M.E., Eggler, D.H.Peridotite and Clinopyroxene Ilmenite Nodules from a Pipe In the Iron Mountain, Wyoming Kimberlite District.Geological Society of America (GSA), Vol. 8, No. 5, P. 631. (abstract.).United States, Wyoming, State Line, Rocky MountainsBlank
DS1975-0502
1977
Eggler, D.H.Eggler, D.H., Mccallum, M.E., Smith, C.B.Discrete Nodule Assemblages in Kimberlites from the Northern Colorado and Southern Wyoming Evidence for a Diapiric Origin of Kimberlite.International Kimberlite Conference SECOND, EXTENDED ABSTRACT VOLUME., United States, Colorado, Wyoming, State Line, Rocky MountainsBlank
DS1975-0561
1977
Eggler, D.H.Mccallum, M.E., Eggler, D.H.Field Guide for the Sloan and Nix Kimberlites in the Southern Portion of the Colorado-Wyoming State Line Kimberlite District #2International Kimberlite Conference SECOND, FIELD GUIDE TRIP No. 4, PP. 182-209.United States, State Line, Colorado, Wyoming, Rocky MountainsKimberley, Distribution
DS1975-0562
1977
Eggler, D.H.Mccallum, M.E., Eggler, D.H., Coopersmith, H.G., Smith, C.B.M.Colorado-Wyoming State Line DistrictInternational Kimberlite Conference SECOND FIELD EXCURSION SEPT. 25-27TH., 25P.United States, Colorado, Wyoming, State Line, Rocky MountainsKimberley, Guidebook
DS1975-0563
1977
Eggler, D.H.Mccallum, M.E., Eggler, D.H., Smith, C.B.Discrete Nodule Assemblages in Kimberlites from Northern Colorado and Southern Wyoming.International Kimberlite Conference SECOND EXTENDED ABSTRACT VOLUME., United States, Colorado, Wyoming, State Line, Rocky MountainsBlank
DS1975-0564
1977
Eggler, D.H.Mccallum, M.E., Kirkley, M.B., Padgett, J.P., Eggler, D.H.Textural and Mineral Compositional Ranges of Ultramafic Nodules from Kimberlites of Northern Colorado and Southern Wyoming #1International Kimberlite Conference SECOND EXTENDED ABSTRACT VOLUME., United States, Colorado, Wyoming, State Line, Rocky MountainsBlank
DS1975-0624
1977
Eggler, D.H.Smith, C.B., Mccallum, M.E., Coopersmith, H.G., Eggler, D.H.Petrography, Petrology and Chemistry of Kimberlite from The colorado-wyoming State Line and Iron Mountain Wyoming Districts.International Kimberlite Conference SECOND, EXTENDED ABSTRACT VOLUME., United States, Wyoming, State Line, Rocky MountainsBlank
DS1975-1005
1979
Eggler, D.H.Eggler, D.H., Mccallum, M.E., Smith, C.B.Megacryst Assemblages in Kimberlite from Northern Colorado And Southern Wyoming: Petrology Geothermometry-barometry And areal Distribution.International Kimberlite Conference SECOND Proceedings, Vol. 2, PP. 213-226.United States, Colorado, Wyoming, State Line, Rocky MountainsBlank
DS1975-1006
1979
Eggler, D.H.Eggler, D.H., Wendlandt, R.F.Experimental Studies on the Relationship between Kimberlite magmas and Partial Melting of Peridotite.Proceedings of Second International Kimberlite Conference, Proceedings Vol. 1, PP. 330-338.LesothoPetrology
DS1975-1134
1979
Eggler, D.H.Mccallum, M.E., Eggler, D.H.Field Guide for the Sloan and Nix Kimberlites in the Southern Portion of the Colorado-Wyoming State Line Kimberlite District #1Unknown, PP. 181-209.United States, Colorado, Wyoming, State Line, Rocky MountainsBlank
DS1975-1135
1979
Eggler, D.H.Mccallum, M.E., Kirkley, M.B., Padgett, J.L., Eggler, D.H.Textural and Mineral Compositional Ranges of Ultramafic Nodules from Kimberlites of Northern Colorado and Southern Wyoming #2Kimberlite Symposium Ii, Cambridge, England., PP. 1-5.United States, Colorado, Wyoming, State Line, Rocky MountainsBlank
DS1975-1223
1979
Eggler, D.H.Smith, C.B., Mccallum, M.E., Coopersmith, H.G., Eggler, D.H.Petrochemistry and Structure of Kimberlites in the Front Range and Laramie Range Colorado-wyoming.International Kimberlite Conference SECOND Proceedings, Vol. 1, PP. 178-189.United States, Colorado, Wyoming, State Line, Rocky MountainsBlank
DS1980-0191
1980
Eggler, D.H.Kirkley, M.B., Mccallum, M.E., Eggler, D.H.Mineral Chemistry and Textural Correlations in Peridotite Nodules from Northern Colorado-southern Wyoming Kimberlites.Geological Society of America (GSA), Vol. 12, No. 6, P. 276, (abstract.).United States, Colorado, Wyoming, State Line, Rocky MountainsBlank
DS1980-0227
1980
Eggler, D.H.Mccallum, M.E., Ater, P.C., Eggler, D.H., Smith, C.B., Shannon.Mantle Eclogite Nodules from Northern Colorado and Southernwyoming.Geological Society of America (GSA), Vol. 12, No. 3, P. 280, (abstract.).United States, Colorado, Wyoming, State Line, Rocky MountainsBlank
DS1982-0076
1982
Eggler, D.H.Ater, P.C., Mccallum, M.E., Eggler, D.H.Petrology and Geochemistry of Mantle Eclogite Xenoliths From Colorado-Wyoming Kimberlites.Proceedings of Third International Kimberlite Conference, TERRA COGNITA, ABSTRACT VOLUME., Vol. 2, No. 3, PP. 221-222, (abstract.).United States, Colorado, Wyoming, State Line, Rocky MountainsBlank
DS1982-0331
1982
Eggler, D.H.Kirkley, M.B., Mccallum, M.E., Eggler, D.H.Mantle Garnet-spinel Transition Zone Demonstrated by Xenoliths from Colorado-Wyoming Kimberlites.Proceedings of Third International Kimberlite Conference, TERRA COGNITA, ABSTRACT VOLUME., Vol. 2, No. 3, PP. 218-219, (abstract.).United States, Colorado, Wyoming, State Line, Rocky MountainsBlank
DS1983-0212
1983
Eggler, D.H.Eggler, D.H.Metasomatism and the Genesis of Ultrapotassic and Related Igneous Rocks: Experimental Constraints.Mantle Metasomatism And The Origin of Ultrapotassic And Rela, 2P.GlobalBlank
DS1983-0355
1983
Eggler, D.H.Kirkley, M.B., Mccallum, M.E., Eggler, D.H.Coexisting Garnet and Spinel in Upper Mantle Xenoliths From colorado Wyoming Kimberlites: Appendix.Annales Scientifiques De L' Universite De Clermont-ferrand Ii, No. 74, PP. 149-156.United States, State Line, Colorado, Wyoming, Rocky MountainsAnalyses
DS1984-0119
1984
Eggler, D.H.Ater, P.C., Eggler, D.H., Mccallum, M.E.Petrology and Geochemistry of Mantle Eclogite Xenoliths From Colorado Wyoming Kimberlites: Recycled Ocean Crust?Proceedings of Third International Kimberlite Conference, Vol. 2, PP. 309-318.United States, Colorado, Wyoming, State LinePetrography, Mineral Chemistry, Garnets, Analyses, Whole Rock Composition
DS1984-0411
1984
Eggler, D.H.Kirkley, M.B., Mccallum, M.E., Eggler, D.H.Coexisting Garnet and Spinel in Upper Mantle Xenoliths From colorado Wyoming Kimberlites.Proceedings of Third International Kimberlite Conference, Vol. 2, PP. 84-96.United States, State Line, Colorado, Wyoming, California, Rocky MountainsWebsterite, Lherzolite, Petrography, Mineral Chemistry, Analyses
DS1984-0635
1984
Eggler, D.H.Schneider, M.E., Eggler, D.H.Compositions of Fluids in Equilibrium with Peridotite: Implications for Alkaline Magmatism-metasomatismProceedings of Third International Kimberlite Conference, Vol. 1, PP. 383-394.GlobalMineral Chemistry, Analyses, Fluids
DS1985-0171
1985
Eggler, D.H.Eggler, D.H., Mccallum, M.E., Kirkley, M.B.Kimberlite-transported Nodules from Colorado Wyoming Enrichment of Shallow Lithosphere by MetasomatismGeological Society of America (GSA), Vol. 17, No. 3, P. 157. (abstract.).United States, Colorado, Wyoming, State LineAriiegite, Griquaite, Websterite
DS1986-0207
1986
Eggler, D.H.Eggler, D.H.Kimberlites: how do they form? (1986)Proceedings of the Fourth International Kimberlite Conference, Held, No. 16, pp. 145-159GlobalReview
DS1986-0208
1986
Eggler, D.H.Eggler, D.H.Peridotite solidi and carbonatite melts: a new analysisGeological Association of Canada (GAC) Annual Meeting, Vol. 11, p. 66. (abstract.)GlobalCarbonatite
DS1986-0558
1986
Eggler, D.H.Meen, J.K., Eggler, D.H., McCallum, M.E.Proterozoic granulite xenoliths from Ming bar diatremeGeological Society of America (GSA) Abstract Volume, Vol. 18, No. 6, p. 692. (abstract.)MontanaBlank
DS1986-0711
1986
Eggler, D.H.Schneider, M.E., Eggler, D.H.Fluids in equilibrium with peridotite minerals-implications for mantleMetasomatismGeochem. et Cosmochem. Acta, Vol. 50, No. 5, May pp. 711-724GlobalMantle, Inclusions
DS1987-0165
1987
Eggler, D.H.Dudas, F.O., Carlson R.W., Eggler, D.H.Regional middle Proterozoic enrichment of the subcontinental mantle source of igneous rocks from central MontanaGeology, Vol. 15, No. 1, pp.22-25MontanaUSA, Carbonatite
DS1987-0166
1987
Eggler, D.H.Dudas, F.O., Eggler, D.H.neodymium anomalies and speculations on the role of garnet in the sources of alkalic igneous rocksGeological Society of America, Vol. 19, No. 7 annual meeting abstracts, p.648. abstracMontanaCrazy Mountains, Lamproites
DS1987-0178
1987
Eggler, D.H.Eggler, D.H.Geochemistry of upper mantle and lower crust beneath Colorado and WyomingGeological Society of America, Vol. 19, No. 5, pp. 272-273. abstractColoradoUSA, Wyoming
DS1987-0179
1987
Eggler, D.H.Eggler, D.H.Solubility of major and trace elements in mantle metasomaticfluids:experimental constraintsIn: Mantle Metasomatism, edited M.A. Menzies, C.J. Hawkesworth, Academic, pp. 21-44GlobalBlank
DS1987-0180
1987
Eggler, D.H.Eggler, D.H.On craton and off craton kimberlites and associated magmas:relation to lithospheric thicknessGeological Society of America, Vol. 19, No. 7 annual meeting abstracts, p.652. abstracSouth AfricaPetrology
DS1987-0181
1987
Eggler, D.H.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
DS1987-0182
1987
Eggler, D.H.Eggler, D.H., McCallum, M.E., Kirkley, M.B.Kimberlite transported nodules from Colorado-Wyoming: a recordof enrichment of shallow portions of an infertile lithosphereMantle metasomatism and alkaline magmatism, edited E. Mullen Morris and, No. 215, pp. 77-90Colorado, WyomingState Line
DS1987-0816
1987
Eggler, D.H.Wyllie, P.J., Eggler, D.H.Discussion of recent papers on carbonated peridotite, bearing on mantle metasomatism and magmatismEarth Planet. Sci. Letters, Vol. 82, No. 3-4, pp. 391-406GlobalMantle genesis, Metasomatism
DS1988-0189
1988
Eggler, D.H.Eggler, D.H.Influence of H2O and CO2 on melt and fluid chemistry in subduction zonesCrust Mantle recycling at convergence zones, Editors, Hart, S.R., pp. 97-104GlobalMantle, Chemistry
DS1988-0190
1988
Eggler, D.H.Eggler, D.H., Meen, J.K., Welt, F., Dudas, F.O., Furlong, K.P.Tectonomagmatism of the Wyoming ProvinceColorado School of Mines Quarterly, Vol. 83, No. 2, Summer pp. 25-40Wyoming, MontanaMetasomatism, xenoliths, lithosphere, Missouri Breaks, kimberlites
DS1989-0166
1989
Eggler, D.H.Braddock, W.A., Cole, J.C., Eggler, D.H.Geologic map of the Diamond Peak Quadrangle, LarimerCounty, Colorado and Albany County, WyomingUnited States Geological Survey (USGS) Map, GQ No. 1614, 1: 24, 000 $ 3.60Colorado, WyomingMap
DS1989-0394
1989
Eggler, D.H.Eggler, D.H.Carbonatites, primary melts, and mantle dynamicsCarbonatites -Genesis and Evolution, Ed. K. Bell Unwin Hyman Publ, pp. 561-579GlobalCarbonatite, Chemistry
DS1989-0395
1989
Eggler, D.H.Eggler, D.H.Kimberlites: how do they form? (1989)Geological Society of Australia Inc. Blackwell Scientific Publishing, No. 14, Vol. 1, pp. 489-504GlobalKimberlite formation, Chemistry Review paper -p
DS1989-0396
1989
Eggler, D.H.Eggler, D.H., Furlong, K.P.Destruction of Wyoming province lithosphere: thermal modeling with kimberlite xenolithsEos, Vol. 70, No. 15, April 11, p. 511. (abstract.)WyomingHeat flow
DS1989-0609
1989
Eggler, D.H.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
DS1989-1001
1989
Eggler, D.H.Meen, J.K., Eggler, D.H.Chemical and isotopic compositions of Absaroka granitoids southwesternMontana. Evidence for Deep seated Archean amphibolite basement BeartoothRegionContributions to Mineralogy and Petrology, Vol. 102, No. 4, pp. 462-477MontanaGeochronology
DS1989-1002
1989
Eggler, D.H.Meen, J.K., Eggler, D.H., Ayers, A.H.C.Experimental evidence for very low solubility of rareearth elements inCO2 rich fluids at mantle conditions #1Nature, Vol. 340, No. 6231, July 27, pp. 301-302GlobalMantle
DS1991-0426
1991
Eggler, D.H.Eggler, D.H., Furlong, K.P.Petrochemical and geophysical evidence for old mantle lithosphere beneathMontanaGuidebook of the Central Montana Alkalic Province, ed. Baker, D.W., Berg. R., No. 100, pp. 87-92MontanaMantle, Mineral chemistry, geophysics
DS1991-0427
1991
Eggler, D.H.Eggler, D.H., Furlong, K.P.Destruction of subcratonic mantle keel: the Wyoming provinceProceedings of Fifth International Kimberlite Conference held Araxa June 1991, Servico Geologico do Brasil (CPRM) Special, pp. 85-87Wyoming, ColoradoMantle, Heat-flow, tectonics, Geophysics -seismics
DS1991-0428
1991
Eggler, D.H.Eggler, D.H., Lorand, J.P.Peridotitic sulfides: a new mantle oxybarometerGeological Society of America Annual Meeting Abstract Volume, Vol. 23, No. 5, San Diego, p. A 272RussiaGeothermometry, Diamonds
DS1991-0429
1991
Eggler, D.H.Eggler, D.H., Lorand, J.P., Meyer, H.O.A.Sulfides, diamonds, mantle fO2 and recyclingProceedings of Fifth International Kimberlite Conference held Araxa June 1991, Servico Geologico do Brasil (CPRM) Special, pp. 88-91GlobalDiamond inclusions, Geothermometry
DS1991-1550
1991
Eggler, D.H.Shank, S.G., Eggler, D.H.Petrology and geochemistry of the Rocky Boy stock, Bearpaw Mountains, Montana: evolution of shonkinite and monzonite magmasGuidebook of the Central Montana Alkalic Province, ed. Baker, D.W., Berg. R., No. 100, pp. 137-139. extended abstractMontanaPetrology, geochemistry, Shonkinites
DS1992-1371
1992
Eggler, D.H.Shank, S.G., Eggler, D.H.Source of potassic and carbonatite magmas in the Rocky Bay stock, BearpawMountains, MontanaEos Transactions, Vol. 73, No. 14, April 7, supplement abstracts p.339MontanaCarbonatite, Geochronology
DS1993-0398
1993
Eggler, D.H.Eggler, D.H., Harris, J.W., Sobolev, N.V.Oxidation state of eclogitic diamond sulfide inclusionsGeological Society of America Annual Abstract Volume, Vol. 25, No. 6, p. A99 abstract onlySouthern AfricaEclogite, Diamond inclusions
DS1993-0790
1993
Eggler, D.H.Kasting, J.F., Eggler, D.H., Raeburn, S.P.Mantle redox evolution and the oxidation state of the Archean atmosphereJournal of Petrology, Vol. 101, No. 2, March pp. 245-258MantleXenoliths, Geochemistry
DS1994-0487
1994
Eggler, D.H.Eggler, D.H., Lorand, J.P.Sulfides, diamonds and mantle fO2Proceedings of Fifth International Kimberlite Conference, Vol. 2, pp. 160-169.MantleDiamond genesis, Oxygen fugacity
DS1995-0085
1995
Eggler, D.H.Ayers, J.C., Eggler, D.H.Partitioning of elements between silicate melt and H2O-NaCl fluids at 1.5and 2.0 Ga pressure: implicationGeochimica et Cosmochimica Acta, Vol. 59, No. 20, Oct. 1, pp. 4237-4246.GlobalMantle, Metasomatism
DS201212-0798
2012
Eggler, D.H.Yakob, J.L., Feineman, M.D., Deane, J.A., Eggler, D.H., Penniston-Dorland, S.C.Lithium partitioning between olivine and diopside at upper mantle conditions: as experimental study.Earth and Planetary Science Letters, Vol. 329-330, pp. 11-21.MantleTechnology
DS1860-0141
1871
Eggleston, T.Eggleston, T.Diamonds from South AfricaLyc. Nat. Hist. City New York Proceedings, Vol. 1, Nov. 20TH. P. 289.Africa, South AfricaDiamond Crystallography
DS1900-0021
1900
Egglestone, W.M.Egglestone, W.M.The South African Collection: Pt. 3, Diamond Bearing Rocks from kimberley.Wensdale Naturalists Field Club, PP. 21-36.Africa, South AfricaPetrology
DS1989-0069
1989
Eggleton, R.A.Banfield, J.F., Eggleton, R.A.Apatite replacement and rare earth mobilization, fractionation and fixation during weatheringClays and Clay Minerals, Vol. 37, No. 2, April pp. 113-127. Database # 17754GlobalRare earths, Weathering
DS1992-1522
1992
Eggleton, R.A.Taylor, G., Eggleton, R.A., et al.Cool climate lateritic and bauxitic weatheringJournal of Geology, Vol. 100, November No. 6, pp. 669-678Australia, New South WalesLaterites, Weathering
DS1998-0383
1998
Eggleton, R.A.Eggleton, R.A.The state of the regolithGeological Society Aust, Spec. Pub., No. 20. $ 70.00AustraliaBook - ad, Regolith, geomorphology
DS1998-0384
1998
Eggleton, R.A.Eggleton, R.A.The state of the regolithGeological Society of Australia, Spec. Publishing No. 20, 240p.AustraliaLaterites, geochemistry, weathering, geomorphology, Drainage patterns
DS201412-0437
2014
Eglal, A.Kamel, O.A., Eglal, A.New contribution to the diamond bearing REE gold silver mineralization at Kasr El-Bassel area, south El-Fayoum, Upper Egypt.30th. International Conference on Ore Potential of alkaline, kimberlite and carbonatite magmatism. Sept. 29-, Africa, EgyptDiamonds
DS1993-0399
1993
Eglington, B.M.Eglington, B.M., Harmer, R.E.A review of the statistical principles of geochronology: II. additional concepts pertinent to radiogenic uranium-lead (U-Pb) (U-Pb) studies.South Africa Journal of Geology, Vol. 96, No. 1-2, pp. 9-21.GlobalGeochronology, Review of uranium-lead (U-Pb) (U-Pb) studies
DS200412-0505
2004
Eglington, B.M.Eglington, B.M., Armstrong, R.A.The Kaapvaal Craton and adjacent orogens, southern Africa: a geochronological database and overview of the geological developmenSouth African Journal of Geology, Vol. 107, 1/2, pp. 13-32.Africa, South AfricaGeochronology - craton
DS200412-0711
2003
Eglington, B.M.Grantham, G.H., Maboko, M., Eglington, B.M.A review of the evolution of the Mozambique belt and implications for the amalgamation and dispersal of Rodinia and Gondwana.Proterozoic East Gondwana: Supercontinent assembly and Breakup. Ed. Yoshida , Geological Society of London Spe, No. 206, pp. 401-426.Gondwana, RodiniaPlume, tectonics
DS201312-0694
2013
Eglinton, B.Pehrsson, S.J., Berman, R.G., Eglinton, B., Rainbird, R.Two Neoarchean supercontinents revisited: the case for a Rae family of cratons.Precambrian Research, Vol. 232, pp. 27-43.Canada, SaskatchewanKenoraland revised, Nunavutia
DS201901-0037
2018
Eglinton, B.Grantham, G., Eglinton, B., Macey, P.H., Ingram,B., Radeneyer, M., Kaiden, H., Manhica, V.The chemistry of Karoo age andesitic lavas along the northern Mozambique coast, southern Africa and possible implications for Gondwana breakup.South African Journal of Geology, Vol. 121, pp. 271-286.Africa, Mozambiquegeodynamics

Abstract: Major, trace, radiogenic isotope and stable isotope data from lavas along the northeastern coast of Mozambique are described. The whole rock composition data demonstrate that the rocks are dominantly andesitic with compositions typical of calc-alkaline volcanic rocks from arc environments. SHRIMP U/Pb data from zircons indicate that the zircons are xenocrystic, having ages of between 500 Ma and 660 Ma, with the age of the lava constrained by Rb/Sr data at ~184 Ma. Strontium, Nd and Pb radiogenic isotope data support an interpretation of extensive mixing between a Karoo age basaltic magma (dolerite) from Antarctica and continental crust similar in composition to the Mozambique basement. Oxygen isotope data also imply a significant crustal contribution to the lavas. Possible tectonic settings for the lavas are at the margin of a plume or from a locally restricted compressional setting during Gondwana breakup processes.
DS1998-0582
1998
Eglinton, B.M.Harmer, R.E., Eglinton, B.M.A deep mantle source for carbonatite magmatism: evidence from the nephelinites and carbonatites...Earth and Planetary Science Letters, Vol. 158, No. 3-4, May 30, pp. 131-142.ZimbabweBuhera District, Carbonatite, magmatism
DS2000-0270
2000
Eglinton, B.M.Elworthy, T., Eglinton, B.M., Armstrong, R.A., Moyes, A.Rubidium-Strontium isotope constraints on timing of late to post-Archean tectonometamorphism- Kaapvaal Craton.Journal of African Earth Sciences, Vol. 30, No.3, pp. 641-50.South Africa, BotswanaGeochronology - metamorphism, Craton - Kaapvaal
DS2003-0371
2003
Eglinton, B.M.Eglinton, B.M., Armstrong, R.A.Geochronological and isotopic constraints on the Mesoproterozoic Namaqa Natal beltPrecambrian Research, Vol. 125, No. 3-4, pp. 179-189.South AfricaGeochronology
DS200412-0506
2003
Eglinton, B.M.Eglinton, B.M., Armstrong, R.A.Geochronological and isotopic constraints on the Mesoproterozoic Namaqa Natal belt, evidence from deep borehole intersections inPrecambrian Research, Vol. 125, no. 3-4, pp. 179-189.Africa, South AfricaGeochronology
DS201606-1104
2016
Eglinton, B.M.Pehrsson, S.J., Eglinton, B.M., Evans, D.A.A., Huston, D.Metallogeny and its link to orogenic style during the Nuna supercontinent.Geological Society of London Special Publication Supercontinent Cycles through Earth History., Vol. 424, pp. 83-94.United States, CanadaSupercontinents

Abstract: The link between observed episodicity in ore deposit formation and preservation and the supercontinent cycle is well established, but this general framework has not, however, been able to explain a lack of deposits associated with some accretionary orogens during specific periods of Earth history. Here we show that there are intriguing correlations between styles of orogenesis and specific mineral deposit types, in the context of the Nuna supercontinent cycle. Using animated global reconstructions of Nuna's assembly and initial breakup, and integrating extensive databases of mineral deposits, stratigraphy, geochronology and palaeomagnetism we are able to assess spatial patterns of deposit formation and preservation. We find that lode gold, volcanic-hosted-massive-sulphide and nickel-copper deposits peak during closure of Nuna's interior ocean but decline during subsequent peripheral orogenesis, suggesting that accretionary style is also important. Deposits such as intrusion-related gold, carbonate-hosted lead-zinc and unconformity uranium deposits are associated with the post-assembly, peripheral orogenic phase. These observations imply that the use of plate reconstructions to assess orogenic style, although challenging for the Precambrian, can be a powerful tool for mineral exploration targeting.
DS1996-0412
1996
Ego, F.Ego, F., Sebrier, M., Beate, B.Do the Billecocha normal faults reveal extension due to lithospheric body forces in the northern AndesTectonophysics, Vol. 265, No. 3/4, Nov. 30, pp. 255-274EcuadorTectonics, Faults
DS1998-1010
1998
EgorkinMilshtein, E.D., Erinchek, Yu.M., Egorkin, ParsotkaThe structure of the lithosphere in diamond bearing kimberlite areas - the Siberian Platform7th International Kimberlite Conference Abstract, pp. 594-6.Russia, SiberiaTectonics, Miny Udachney Craton
DS200712-0576
2006
Egorkin, A.Kostyuchenko, S., Sapozhnikov, R., Egorkin, A., Gee, D.G., Berzin, R., Solodilov, L.Crustal structure and tectonic model of northeastern Baltica, based on deep seismic and potential field data.Geological Society of London Memoir, No. 32, pp. 521-540.Europe, Baltic ShieldTectonics, geophysics
DS1994-0234
1994
Egorkin, A.V.Bulin, N.K., Egorkin, A.V.Usage of multiwave DSS for small scale forecasting of mineralization and presence of diamonds.Russian Geology and Geophysics, Vol. 34, No. 9, pp. 83-95.RussiaGeophysics, Diamond morphology
DS1998-0385
1998
Egorkin, A.V.Egorkin, A.V.Velocity structure, composition and discrimination of crustal provinces In the former Soviet Union.Tectonophysics, Vol. 298, No. 4, Dec. 10, pp. 395-RussiaGeophysics - seismics, Craton
DS2001-0290
2001
Egorkin, A.V.Egorkin, A.V.Upper mantle structure below the Daldyn Alakitsk kimberlite fieldGeol. Ore Dep., Vol. 43, No. 1, pp. 19-32.RussiaTectonics, Geophysics - seismics
DS2001-0291
2001
Egorkin, A.V.Egorkin, A.V.Upper mantle structure below the Daldyn - Alakitsk kimberlite field by nuclear explosion seismograms.Geology Ore Deposits, Vol. 43, No. 1, pp. 19-22.Russia, YakutiaGeophysics - seismics, Deposit - Daldyn - Alakitsk
DS2003-0372
2003
Egorkin, A.V.Egorkin, A.V.Structure of the Earth's crust and upper mantle within kimberlite and oil and gas fieldsGeology of Ore Deposits, Vol. 45, No. 3, pp. 213-21.MantleTectonics
DS2003-0373
2003
Egorkin, A.V.Egorkin, A.V.Structure of Earth's crust and upper mantle within kimberlite and oil and gas fieldsGeology of Ore Deposits, Vol. 45, 3, pp. 213-221.RussiaTectonics
DS2003-0374
2003
Egorkin, A.V.Egorkin, A.V.Upper mantle structure below Siberian kimberlite fieldGlobal Tectonics and Metallogeny, Vol. 8, Nos. 1-4, pp. 159-162Siberia, mantleBlank
DS2003-1378
2003
Egorkin, A.V.Thybo, H., Ross, A.R., Egorkin, A.V.Explosion seismic reflections from the Earth's coreEarth and Planetary Science Letters, Vol. 216, 4, pp. 693-702.MantleGeophysics - seismics
DS2003-1379
2003
Egorkin, A.V.Thybo, H., Ross, A.R., Egorkin, A.V.Explosion seismic reflections from the Earth's coreEarth and Planetary Science Letters, Vol. 216, 4, Dec. 10, pp. 693-702.MantleBlank
DS200412-0507
2003
Egorkin, A.V.Egorkin, A.V.Structure of the Earth's crust and upper mantle within kimberlite and oil and gas fields.Geology of Ore Deposits, Vol. 45, No. 3, pp. 213-21.MantleTectonics
DS200412-1991
2003
Egorkin, A.V.Thybo, H., Ross, A.R., Egorkin, A.V.Explosion seismic reflections from the Earth's core.Earth and Planetary Science Letters, Vol. 216, 4, Dec. 10, pp. 693-702.MantleCore, mantle boundary, geophysics
DS2001-0767
2001
EgorovMedvedev, V.Ya., Ivanova, Egorov, Lashkevich, UshchapovKelyphitic rims around garnet in kimberlites: an experimental studyDoklady, Vol.381A, No.9, Nov-Dec. pp. 1096-98.RussiaKimberlite - garnet mineralogy
DS200812-0416
2007
EgorovGlebovitsky, V.A., Nikitin, L.P., Salitykova, A.K., Ovchinnikov, N.O., Babushkina, M.S., Egorov, AshchepkovCompositional heterogeneity of the continental lithospheric mantle beneath the Early Precambrian and Phanerozoic structures: evidence from mantle xenoliths.Geochemistry International, Vol. 45, 11, pp. 1077-1102.MantleKimberlites and basalts
DS2003-0236
2003
Egorov, A.Channer, D.M. De R., Egorov, A., Kaminsky, F.V.Geological and tectonic setting of the Guaniamo kimberlite sheets, south west8ikc, Www.venuewest.com/8ikc/program.htm, Session 5, POSTER abstractVenezuelaTarget area selection
DS1988-0193
1988
Egorov, A.N.Egorov, K.N., Egorov, A.N., Sandomirskaya, S.M.Megacrystals of orthopyroxene from the Udachnaya kimberlite pipe.(Russian)Zap. Vses. Mineral. O-Va, (Russian), Vol. 117, No. 6, pp. 681-685RussiaMineralogy
DS1981-0148
1981
Egorov, E.N.Egorov, E.N.Morphological Genetic Interpretation of Some Textural and Structural Features of Kimberlites.Soviet Geology Geophysics, Vol. 22, No. 12, PP. 53-58.RussiaKimberlite, Geomorphology, Tectonic
DS1986-0138
1986
Egorov, I.I.Chernysheva, E.A., Egorov, I.I.The intrusive nature of melilitic rocks in the East Sayan.(Russian)Doklady Academy of Sciences Akademy Nauk SSSR, (Russian), Vol. 290, No. 2, pp. 445-448RussiaMelilite
DS1983-0213
1983
Egorov, K.N.Egorov, K.N.The Sequence of Olivine Crystallization at the Mantle StAge of Kimberlite Formation.Doklady Academy of Sciences AKAD. NAUK SSSR., Vol. 271, No. 1, PP. 174-177.RussiaKimberlite Genesis
DS1983-0367
1983
Egorov, K.N.Kostrovitskii, S.I., Egorov, K.N.The Multistage Filling of Kimberlites and Its MechanismSoviet Geology and GEOPHYS., Vol. 24, No. 5, PP. 39-45.RussiaGenesis
DS1983-0368
1983
Egorov, K.N.Kostrovitskii, S.I., Egorov, K.N.The Multistage Filling of Kimberlites and Its MechanismsSoviet Geology And Geophysics, Vol. 24, No. 5, PP. 39-45.RussiaKimberlite, Genesis
DS1983-0551
1983
Egorov, K.N.Safronov, A.F., Egorov, K.N., Makhotko, V.F.Pecularities of the Temperature Regime of Kimberlite Melt CrystallizationDoklady Academy of Sciences AKAD. NAUK SSSR., Vol. 269, No. 2, PP. 454-457.RussiaGenesis
DS1985-0172
1985
Egorov, K.N.Egorov, K.N.Contact relations between kimberlites of different phases of extrusion incomplexly formed pipes.(Russian)Izv. Akad. Nauk SSSR, (Russian), No. 9, pp. 23-35RussiaBreccias, Kimberlite
DS1986-0209
1986
Egorov, K.N.Egorov, K.N.Variation of the isotopic composition of carbon and oxygen during the metasomatic transformation of kimberlites.(Russian)Doklady Academy of Sciences Akademy Nauk SSSR, (Russian), Vol. 286, No. 2, pp. 429-433RussiaGeochronology
DS1986-0210
1986
Egorov, K.N.Egorov, K.N., Bogdanov, G.V., Medvedeva, T.I.Zonal garnets from kinberlite pipe.(Russian)Doklady Academy of Sciences Akademy Nauk SSSR (Russian), Vol. 290, No. 6, pp. 1463-1467GlobalBlank
DS1986-0211
1986
Egorov, K.N.Egorov, K.N., Kornilova, V.P., Safronov, A.F., Fillippov, N.D.Micaceous kimberlite from the Udachnia Vostochnaia pipe.(Russian)Doklady Academy of Sciences Akademy Nauk SSSR (Russian), Vol. 291, No. 1, pp. 199-201RussiaMineralogy, Mica
DS1987-0183
1987
Egorov, K.N.Egorov, K.N., Ushchapovskaya, Z.F., Shy*vyrev, G.G., et al.Hexahydrite in kimberlites of Yakutia (USSR).(Russian)Zap.Vses Mineral. O. Va, (Russian), Vol. 116, No. 6, pp. 718-721RussiaBlank
DS1988-0191
1988
Egorov, K.N.Egorov, K.N., et al.On the find of potassium trachyte in the region of UdachnaiaKimberlite pipe (Yakutia).(Russian)Doklady Academy of Sciences Akademy Nauk SSSR, (Russian), Vol. 298, No. 1, pp. 186-190RussiaBlank
DS1988-0192
1988
Egorov, K.N.Egorov, K.N., Bogdanov, G.V., Medvedeva, T.I.Zonal garnets with mineral inclusions from kimberlitic pipes of Malobotuobinskii region. (Russian)Izvest. Akad. Nauk Ser. Geol., (Russian), No. 1, January pp. 112-119RussiaBlank
DS1988-0193
1988
Egorov, K.N.Egorov, K.N., Egorov, A.N., Sandomirskaya, S.M.Megacrystals of orthopyroxene from the Udachnaya kimberlite pipe.(Russian)Zap. Vses. Mineral. O-Va, (Russian), Vol. 117, No. 6, pp. 681-685RussiaMineralogy
DS1988-0194
1988
Egorov, K.N.Egorov, K.N., Klopotov, V.I.Internal structure and formation characteristics of the Taigakimberlitepipes.(Russian)Geologii i Geofiziki, (Russian), No. 7, July, pp. 121-125RussiaPetrology, Taiga
DS1988-0195
1988
Egorov, K.N.Egorov, K.N., Klopotov, V.I.Internal structure and features of the formation of the Taezhnyi kimberlitepipeSoviet Geology and Geophysics, Vol. 29, No. 7, pp. 116-119RussiaStructure, Taezhnyi
DS1988-0196
1988
Egorov, K.N.Egorov, K.N., Ushchapovskaya, Z.F., Kashaev, A.A., Bogdanov, G.V.Zemkorite- new carbonate from kimberlites of Yakutia.(Russian)Doklady Academy of Sciences Akademy Nauk SSSR, (Russian), Vol. 301, No. 1, pp. 188-193RussiaUdachanaya
DS1988-0197
1988
Egorov, K.N.Egorov, K.N., Vladimirov, B.M., Zaborovskii, V.V., et al.Potassium trachyte vein in the region of the Udachnaya kimberlite pipe(yakutia). (Russian)Doklady Academy of Sciences Akademy Nauk SSSR, (Russian), Vol. 298, No. 1, pp. 186-189RussiaBlank
DS1991-0430
1991
Egorov, K.N.Egorov, K.N., Bogdanov, V.Mineralogical isotopic dynamics, physico-chemical conditions and stages of serpentinization process of kimberlites from YakutiaProceedings of Fifth International Kimberlite Conference held Araxa June 1991, Servico Geologico do Brasil (CPRM) Special, pp. 492-494RussiaPetrology, Serpentinization, kimberlites
DS1991-0431
1991
Egorov, K.N.Egorov, K.N., Bogdanov, V., Solovjeva, L.V., Barankevich, V.G.Evidence of magmatism, metasomatism and deformation processes obtained From the study of the unique compositionally complex nodule from the Udachanya pipeProceedings of Fifth International Kimberlite Conference held Araxa June 1991, Servico Geologico do Brasil (CPRM) Special, pp. 495-497RussiaNodule, Deposit -Udachnaya
DS1991-0432
1991
Egorov, K.N.Egorov, K.N., Vladimirov, B.M., Bogdanov, G.V.Geology, petrology and mineral composition of the Udachnaya kimberlite ore complex (Yakutia)Proceedings of Fifth International Kimberlite Conference held Araxa June 1991, Servico Geologico do Brasil (CPRM) Special, pp. 498-500RussiaPetrology, Deposit -Udachnaya
DS1991-1808
1991
Egorov, K.N.Vladimirov, B.M., Egorov, K.N., Maslovskaya, M.N., DneprovskayaBasaltic and mica kimberlites of the Siberian platform and their time space and genetic relationshipsProceedings of Fifth International Kimberlite Conference held Araxa June 1991, Servico Geologico do Brasil (CPRM) Special, pp. 573-575RussiaGeochronology, Deposit -Udachnya
DS1993-0400
1993
Egorov, K.N.Egorov, K.N., Bezborodov, S.M., Mazilov, V.N.Occurrence of xenoliths of volcanogenic sedimentary rocks from the Udachnaya kimberlite pipe. (Russian)Doklady Academy of Sciences Akademy Nauk SSSR, (Russian), Vol. 328, No. 3, January pp. 376-378Russia, Commonwealth of Independent States (CIS), YakutiaVolcanics, Xenoliths
DS1995-0484
1995
Egorov, K.N.Egorov, K.N., Semenova, V.G., Bogdanov, G.V.Common patterns of the process of early serpentinization of dunites andkimberlites.. UralsRussian Geology and Geophysics, Vol. 36, No. 9, pp. 79-84.Russia, Yakutia, UralsKosva, ultrabasites, lizardite, brucite, Mineralogy -serpentization, kimberlites
DS1995-0532
1995
Egorov, K.N.Feoktistov, G.D., Vladimirov, B.M., Egorov, K.N., KonevKimberlite and lamproite comparative petrogeochemistryProceedings of the Sixth International Kimberlite Conference Extended Abstracts, p. 152-54.Russia, SiberiaLamproite, Petrology
DS1995-1803
1995
Egorov, K.N.Solovjeva, L.V., Egorov, K.N., Dneprovskaya, L.R., et al.The role of fO2 regime in evolution of mantle metasomatism and diamondformation.Proceedings of the Sixth International Kimberlite Conference Abstracts, pp. 566-568.MantleOxygen fugacity, Metasomatism
DS1996-0454
1996
Egorov, K.N.Feoktistov, G.D., Vladimirov, B.M., Egorov, K.N., Konev, A.Petrochemical comparison of kimberlites and some lamproites of the Siberian Platform and Australia.Russian Geology and Geophysics, Vol. 37, No. 10, pp. 26-33.Russia, Siberia, AustraliaLamproites, Petrology
DS1997-1017
1997
Egorov, K.N.Sekerin, A.P., Egorov, K.N., Menshagin, Yu.V.Structural control and diamond potential of mantle magmatic rocks of The southwestern Siberian PlatformDoklady Academy of Sciences, Vol. 355A, No. 6, July-Aug. pp. 1324-26.Russia, SiberiaStructure, tectonics, Diamond genesis
DS1998-0421
1998
Egorov, K.N.Feokistov, G.D., Egorov, K.N.Titanium distribution in lamproites and the depth of generation of theirmelts.Doklady Academy of Sciences, Vol. 361, No. 5, pp. 732-4.RussiaLamproites, Genesis - melt
DS2000-0879
2000
Egorov, K.N.Sekerin, A.P., Menshagin, Y.U., Egorov, K.N.Mantle magmatism and diamond potential of the Tumanshet Graben, northeastern Sayany Region.Doklady Academy of Sciences, Vol. 371, No. 2, pp. 247-50.RussiaMagmatism, Tumanshet region
DS2001-0766
2001
Egorov, K.N.Medvedev, V.Ya., Egorov, K.N., Ivanova, L.A.Experimental modeling of the regressive transformation of picroilmenites from kimberlite rocks.Doklady Academy of Sciences, Vol. 376, No. 1, Jan-Feb. pp. 54-6.RussiaPetrology - experimental
DS2002-0420
2002
Egorov, K.N.Egorov, K.N.New dat a on mineralogy of sedimentary reservoirs of diamonds in the southwesternDoklady Earth Sciences, Vol.382,1,pp.109-111.RussiaAlluvials, placers, mineralogy, Deposit -
DS2002-0421
2002
Egorov, K.N.Egorov, K.N., Menshagin, Sekerin, Koshkarev, UshchapovNew dat a on mineralogy of sedimentary reservoirs of diamonds in the southwestern Siberian platform.Doklady, Vol.382, 1, Jan-Feb.pp. 109-11.Russia, SiberiaAlluvials, placers
DS2003-0375
2003
Egorov, K.N.Egorov, K.N., Denisnko, E.P., Menshagin, Yu.V., Sekerin, A.P., Koshkarev, D.A.New occurrence of alkaline ultramafic rocks in the southern Siberian platformDoklady Earth Sciences, Vol. 390, 4, May-June pp. 478-82.RussiaAlkaline rocks
DS200412-0508
2003
Egorov, K.N.Egorov, K.N., Denisnko, E.P., Menshagin, Yu.V., Sekerin, A.P., Koshkarev, D.A.New occurrence of alkaline ultramafic rocks in the southern Siberian platform.Doklady Earth Sciences, Vol. 390, 4, May-June pp. 478-82.RussiaAlkalic
DS200412-0509
2004
Egorov, K.N.Egorov, K.N., Mishenin, S.G., Menshagin, Yu.V., Serov, V.P., Sekerin, A.P., Koshkarev, D.A.Kimberlite minerals from the lower Carboniferous deposits of the Mura-Kovinsky diamond bearing area.*** IN RUSSIAN LANGUAGEProceedings of the Russian Mineralogical Society ***in RUSSIAN, Vol. 133, 1,pp. 32-40 ***RUSSIANRussiaMineralogy
DS200412-0510
2004
Egorov, K.N.Egorov, K.N., Soloveva, L.V., Simakin, S.G.Megacrystalline cataclastic lherzolite from the Udachnaya pipe: mineralogy, geochemistry and genesis.Doklady Earth Sciences, Vol. 397, 5, June, pp. 698-702.Russia, YakutiaMineralogy - Udachnaya
DS200412-1086
2004
Egorov, K.N.Lashkevich, V.V., Medvedev, V.Y., Egorov, K.N., Ivanova, L.A.Experimental and numerical modeling of the metasomatic replacement of picroilmenites from kimberlites.Geochemistry International, Vol. 42, 1, pp. 49-56.RussiaMetasomatism, Deposit - Jubileinaya
DS200412-1875
2004
Egorov, K.N.Soloveva, L.V., Gornova, M.A., Egorov, K.N., Smironov, E.V.REE and HFSE distribution in rocks and minerals from granular peridotite xenoliths in the Udachnaya kimberlite pipe.Doklady Earth Sciences, Vol. 395, 4, March-April, pp. 456-460.Russia, YakutiaGeochemistry
DS200512-0714
2005
Egorov, K.N.Medvedev, V.Y., Ivanova, L.A., Egorov, K.N., Laskevich, V.V.Formation of kelphytic rims around garnet in kimberlites: experimental and physicochemical modeling.Geochemistry International, Vol. 43, 8, pp. 769-775.RussiaMineral chemistry
DS200512-1025
2005
Egorov, K.N.Solovjeva, L.V., Egorov, K.N., Kostrovitsky, S.I., Gornova, M.A.The effect of different metasomatic processes on geochemical heterogeneity of upper mantle of the Siberian craton.GAC Annual Meeting Halifax May 15-19, Abstract 1p.Russia, Yakutia, SakhaUdachnaya, geochemistry
DS200612-0365
2005
Egorov, K.N.Egorov, K.N., Rotman, A.Y., Zinchuk, N.N., Nosyko, S.F.Petrochemical composition of kimberlites in northeastern Angola.Doklady Earth Sciences, Vol. 403A, 6, pp. 891-895.Africa, AngolaGeochemistry
DS200612-0366
2006
Egorov, K.N.Egorov, K.N., Soloveva, Kovach, Menshagin, Maslovskaya, Sekerin, BankovskayaPetrological features of olivine phlogopite lamproites of the Sayan region: evidence from the Sr Nd isotope and ICP MS trace element data.Geochemistry International, Vol. 44, 7. pp. 729-735.RussiaLamproite
DS200612-0367
2005
Egorov, K.N.Egorov, K.N., Soloveva, L.V., Kovach, V.P., Menshagin, Y.V., Maslovskaya, Sekerin, A.P., Bankovskaya, E.V.Mineralogical and isotope geochemical characteristics of Diamondiferous lamproites of the Sayan region.Doklady Earth Sciences, Vol. 403A, 6, pp. 861-865.RussiaGeochronology
DS200612-1333
2006
Egorov, K.N.Solovjeva, L.V., Egorov, K.N.Effects of the Yakutian plume on processes within the upper mantle of the Siberian Craton: geochemical data.Vladykin: VI International Workshop, held Mirny, Deep seated magmatism, its sources and plumes, pp. 104-124.Russia, SiberiaHotspots, metamorphism
DS200712-0286
2007
Egorov, K.N.Egorov, K.N., Ramnko, E.F., Podvysotsky, V.T., Sabulukov, S.M., Garanin, V.K., Dyakonov, D.B.New dat a on kimberlite magmatism in southwestern Angola.Russian Geology and Geophysics, Vol. 48, 4, pp. 323-336.Africa, AngolaMagmatism - kimberlites
DS200812-0313
2008
Egorov, K.N.Egorov, K.N., Koshkarev, D.A., Karpenko, M.A.Mineralogical geochemical criteria of diamond potential of kimberlites in the Yubileinaya multiphase pipe ( Yakutia).Doklady Earth Sciences, Vol. 422, 1, October pp. 1137-1141.Russia, YakutiaDeposit - Yubileinaya
DS200812-1095
2008
Egorov, K.N.Soloveva, L.V., lavrentew, Y.G., Egorov, K.N., Kostrovitskii, S.I., Korolyuk, V.N., Suvorova, L.F.The genetic relationship of the deformed peridotites and garnet megacrysts from kimberlites with asthenospheric melts.Russian Geology and Geophysics, Vol. 49, 4, pp. 207-224.RussiaPetrology - Udachnaya
DS200912-0383
2009
Egorov, K.N.Kislelev, A.I., Yarmolyuk, V.V., Egorov, K.N.Potassium basalts and picrobasalts from the Devonian kimberlite fields of western Yakutia, Russia: and their relation to kimberlite magmatism.Geology of Ore Deposits, Vol. 51, 1, pp. 33-50.Russia, YakutiaDeposit - Vilyui-Markha
DS201012-0498
2009
Egorov, K.N.Minaeva, Yu.A., Egorov, K.N.Mineralogy and petrology of a kimberlite picrite dike in the northwestern Urik Iya graben, the eastern Sayan region.Geology of Ore Deposits, Vol. 51, 7, pp. 565-576.Russia, SayanDeposit - Bunder
DS201012-0737
2010
Egorov, K.N.Soloveva, L.V., Yasnygina, T.A., Korolyuk, V.N., Egorov, K.N.Geochemical evolution of deep fluids in the mantle lithosphere of the Siberian Craton during the Middle Paleozoic kimberlite cycle.Doklady Earth Sciences, Vol. 434, 2, pp.1330-1336.RussiaGeochemistry - melting
DS201112-0298
2010
Egorov, K.N.Egorov, K.N., Kiselev, A.I., Menshagin, Yu.V., Minaeva, Yu.A.Lamproite and kimberlite of the Sayany area: composition, sources and diamond potenial.Doklady Earth Sciences, Vol. 435, 2, pp. 1670-1675.RussiaDiamond exploration
DS201112-0299
2011
Egorov, K.N.Egorov, K.N., Kiselev, A.I., Yarmolyuk, V.V., Nikiforov, A.V.Composition and sources of magmatism of the middle Paleozoic Vilyui rift area and the problem of combination of its basic and kimberlitic derivatives.Doklady Earth Sciences, Vol. 436, 1, pp. 76-82.RussiaMagmatism
DS201212-0182
2012
Egorov, K.N.Egorov, K.N., Soloveva, L.V., Koshkarev, D.A.Rare element composition of pyropes and lamproites and ancient dispersion haloes of the southwestern Siberian platform.Doklady Earth Sciences, Vol. 443, 2, pp. 496-501.Russia, SiberiaLamproites - Ingashin, Prisayan region
DS201212-0183
2012
Egorov, K.N.Egorov, K.N., Soloveva, L.V., Koshkarev, D.A.Rare element composition of pyropes and lamproites and ancient dispersion haloes of the southwestern Siberian platform.Doklady Earth Sciences, Vol. 443, 2, pp. 496-501.Russia, SiberiaIngashin field
DS201212-0359
2012
Egorov, K.N.Kiselev, A.I., Ernst, R.E., Yarmoluk, V.V., Egorov, K.N.Radiating rifts and dyke swrms of the middle Paleozoic Yakutsk plume of eastern Siberian craton.Journal of Asian Earth Sciences, Vol. 45, 2, pp. 1-16.Russia, YakutiaDeposit - Mirmyi, Nakyn, Dladyn-Alakit
DS201212-0377
2012
Egorov, K.N.Kostrovitsky, S.I., Kopylova, M.G., Egorov, K.N., Yakolev, D.A., Kalashnikova, T.V., Sandmirova, G.P.The exceptionally fresh Udachnaya -East kimberlite: evidence for brine and evaporite contamination.10th. International Kimberlite Conference Feb. 6-11, Bangalore India, AbstractRussia, YakutiaDeposit - Udachnaya -east
DS201312-0501
2013
Egorov, K.N.Kopylova, M.G., Kostrovitsky, S.I., Egorov, K.N.Salts in southern Yakutian kimberlites and the problem of primary alkali kimberlite melts.Earth Science Reviews, Vol. 119, pp. 1-16.Russia, YakutiaDeposit - Udachnaya
DS201312-0502
2013
Egorov, K.N.Kopylova, M.G., Kostrovitsky, S.I., Egorov, K.N.Primary alkali kimberlite melt: the myth dispelled.Goldschmidt 2013, AbstractMantleMelt - genesis
DS201312-0867
2012
Egorov, K.N.Soloveva, L.V., Yasnygina, T.A., Egorov, K.N.Metasomatic parageneses in deep seated xenoliths from pipes Udachnaya and Komosomolskaya Magnitinaya as indicators of fluid transfer through the manyle lithosphere of the Siberian Craton.Russian Geology and Geophysics, Vol. 53, 12, pp. 1291-1303.RussiaDeposit - Udachnaya, Komosomolskaya
DS1960-0223
1962
Egorov, L.S.Butakova, E.L., Egorov, L.S.The Kimberlitic Bodies and the Structure of the Chadobets Uplift.Report KRASNOYARSK STATE University, No. 3, PP. LL7-L30.RussiaBlank
DS1982-0183
1982
Egorov, L.S.Egorov, L.S.On the Relative Age of Melilitic Rocks in Ijolite-carbonatite Massifs of the Karelia-kola Region.Doklady Academy of Sciences AKAD. NAUK. SSSR., Vol. 265, No. 4, PP. 935-937.RussiaBlank
DS1984-0304
1984
Egorov, L.S.Gilinskaya, L.G., Egorov, L.S.Esr Spectra of Apatites of the Maimecha Kotuj Ijolite Carbonatite Complex.Geochemistry International (Geokhimiya)., No. 12, DECEMBER PP. 1858-1866.RussiaCarbonatite
DS1992-0414
1992
Egorov, L.S.Egorov, L.S.Proscorites and origin of non-carbonate (including rare metal)mineralization in carbonatitesProceedings of the 29th International Geological Congress. Held Japan August 1992, Vol. 2, abstract p. 577RussiaCarbonatite, Proscorites
DS1993-0034
1993
Egorov, L.S.Andronikov, A.V., Egorov, L.S., et al.Mesozoic alkaline ultrabasic magmatism of Jetty PeninsulaInternational Gondwana Symposium, III, Editors Findlay, Vol. 8, pp. 547-557.GlobalMelilitites, picrite, nephelinite, Xenoliths
DS1993-0401
1993
Egorov, L.S.Egorov, L.S., Melnik, A.Y., Ukhanov, A.V.On 1st discovered kimberlite with syngenetic shliren of calcitic carbonatite from a dike in Antarktida.(Russian)Doklady Academy of Sciences Akademy Nauk SSSR, (Russian), Vol. 328, No. 2, January pp. 230-233GlobalCarbonatite, Calcite
DS1993-0402
1993
Egorov, L.S.Egorov, L.S., Yegorov, L.S., et al.Prospects of mineral detection associated with alkaline-ultrabasic rocks(Prince Charles Mountains).International Gondwana Symposium, III, Editors Findlay, Vol. 8, pp. 559-562.GlobalLamproite, Kimberlite, diamonds
DS201704-0624
1969
Egorov, L.S.Egorov, L.S.Melilitic rocks of the Meimecha Kotui Province, Northern Siberia. ***IN RUSNedra Publishing House, Leningrad., 249p. *** in RUSRussiaMelilites
DS200612-1173
2005
Egorov, N.N.Romanko, E.F., Egorov, N.N., Podvysotskii, V.T., Sablukov, S.M., Dyakonov, D.B.A new Diamondiferous kimberlite region in southwestern Angola.Doklady Earth Sciences, Vol. 403A, 6, pp. 817-821.Africa, AngolaDiamond exploration
DS1960-1147
1969
Egorov, O.S.Kovalskii, V.V., Nikishov, K.N., Egorov, O.S.Kimberlitic and Carbonatitic Deposits of the Eastern and Southeastern Flank of the Anabar Anteclise.Moscow: Nauka., 288P.RussiaBlank
DS201709-1981
2017
Egorova, E.Egorova, E., Afanasev, V.Mineralogical features for determining age of kimberlites from Siberian craton by kimberlitic indicator minerals from placers. Mayat, Muna, Tychan, KenkemeGoldschmidt Conference, abstract 1p.Russia, Siberiageochemistry

Abstract: The history of kimberlite magmatism in the Siberian craton comprised the Middle Paleozoic (Late Devonian), Triassic, and Jurassic-Cretaceouse events. The Middle Paleozoic event produced greatest amounts of diamond-bearing kimberlites; diamond contents in the Triassic rocks are much lower, while the Jurassic-Cretaceous kimberlites are actually barren [1]. Minerals derived from kimberlites of different ages often coexist in placers and dispersion trains, which poses problems to the use of mineralogical methods for diamond exploration. The problem can be solved by knowing the morphological features of kimberlite indicator minerals typical of each magmatic event [2]. Garnets from Middle Paleozoic kimberlites have the following features: a) chemistry corresponding to diverse parageneses, including those of diamond assemblage; b) weak to strong wear; predominant medium and high wear degrees; c)signatures of dissolution in Late Devonian laterite weathering profiles. Garnets from Triassic kimberlites differ in a) lower paragenetic diversity; few or absent garnets of diamond assemblage; b) only low wear degree; strong wear restricted to garnets from Triassic kimberlites hosted by coastal sediments; c) no dissolution signatures. Jurassic-Cretaceous ages of kimberlites can be inferred from a) changes in paragenetic diversity as a result of deep metasomatism and predominance of shallow lherzolite varieties; no diamond assemblage garnets; b) weak wear; c) no dissolution signatures. The approach was used to estimate the ages of kimberlites in some kimberlite provinces. As a result, we inferred the existence of Middle Paleozoic kimberlites in the Kyutyungde graben, in the catchments of the Mayat, Billakh (Anabar area), and Muna rivers, in the MarkhaMorkoka interfluve, and in the Tychan diamond province (Krasnoyarsk region); Triassic kimberlites in the northern slope of the Olenek uplift and within the Bulkur uplift; and Late Jurassic-Early Cretaceous kimberlites in the Kenkeme catchment north of Yakutsk city.
DS201612-2297
2016
Egorova, E.O.Egorova, E.O., Afanasev, V.P., Pokhilenko, N.P.Middle Paleozoic kimberlite magmatism in the northeastern Siberia.Doklady Earth Sciences, Vol. 470, 2, pp. 1023-1026.Russia, SiberiaDeposit - Billyakh River placers

Abstract: The mineral chemistry and crystal morphology of kimberlite pyropes from the Billyakh River placer in the northeastern Siberian craton are characterised in terms of the placer history. The pyropes bear signatures of chemical weathering (dissolution), presumably in a Middle Paleozoic laterite profile, and therefore were originally hosted by Middle Paleozoic kimberlites. The broad occurrence of placer pyropes with lateritic dissolution signatures points to the presence of Middle Paleozoic diamond-bearing kimberlites in the study area.
DS202005-0718
2020
Egorova, E.O.Afanasiev, V.P., Pokhilenko, N.P., Egorova, E.O., Lindenblot, E.S.The most ancient diamond crystals of the Siberian platform. Lamproites Morgogor Creek .. Ebelyakh River.Doklady Earth Sciences, Vol. 489, 2, pp. 1409-1412. pdf Russia, Siberiadiamond alluvials

Abstract: Based on a study of diamond grains from placers of the northeastern Siberian Platform, it is shown that certain types of diamonds (rounded dodecahedroids, diamonds of the II and V?VII varieties, according to the classification by Yu.L. Orlov) could have originated from Precambrian sources. “Ancient” diamonds also differ in terms of their sedimentological history: those of varieties V?VII, despite the maximum abrasion resistance, have the maximum degree of rounding, reflecting their more long-term sedimentological history, and, therefore, their ore bodies were likely the most ancient.
DS1987-0391
1987
Egorova, L.N.Kvasnitsa, V.N., Krochuk, V.M., Egorova, L.N., Kharkiv, A.D.Crystal morphology of zircon from kimberlites.(Russian)Mineral Zhurn., (Russian), Vol. 9, No. 2, pp. 37-45RussiaBlank
DS1992-1011
1992
Egorova, L.N.Matsyuk, S.S., Vishnevskii, A.A., Cherenkova, A.F., Egorova, L.N.K-richterite bearing ilmenite clinohumite dunites: a new variety of Deep seated peridotites in kimberlites.Soviet Geology and Geophysics, Vol. 32, No. 12, pp. 64-70.Russia, SayanGeochemistry, mineral chemistry, Peridotite xenoliths
DS202007-1177
2020
Egorova, S.V.Salnikova, E.B., Samsonov, A.V., Stepanova, A.V., Veselovskiy, R.V., Egorova, S.V., Arzamastsev, A.A., Erofeeva, K.G.Fragments of Paleoproterozoic large igneous provinces in northern Fennoscandia: baddeleyite U-Pb age data for mafic dykes and sills.Doklady Earth Sciences, Vol. 491, pp. 227-230.Europe, Russia, Kola Peninsulageochronology

Abstract: New data on the age of dolerite dikes in the NE part of the Kola province of the Fennoscandinavian shield and the picrodolerite sills that cut the dikes are presented. The results of U-Pb ID-TIMS baddeleyite dating indicate that dolerites were formed between 2508 ± 6 and 2513 ± 16 Ma ago, simultaneously with the intrusions of the Monchegorsk group. A comparison of the composition of the dolerites studied with dykes of the same age found in other Archean cratons shows their significant similarity and suggests their formation at the same large magmatic province. The age of baddeleyite from the picrodolerites sills at 2403 ± 12 Ma ago indicates an event of basic magmatism that was not previously established in this part of the Fennoscandinavian shield. It is possible that, along with dolerite dykes with an age of 2405 Ma and komatiites of the Vetreny belt of the Karelian craton, sills of the Kola province are a component of a unified large magmatic event.
DS202010-1843
2020
Egorova, S.V.Erofeeva, K.G., Samsonov, A.V., Stepanova, A.V., Larionova, Yu.O., Dubinina, E.O., Egorova, S.V., Arzamastesev, A.A., Kovalchuk, E.V., Abramova, V.D.Olivine and clinopyroxene phenocrysts as a proxy for the origin and crustal evolution of primary mantle melts: a case study of 2.40 Ga mafic sills in the Kola-Norwegian Terrane, northern Fennoscandia.Petrology, Vol. 28, 4, pp. 338-356. pdfEurope, Norway, Kola Peninsulamelting

Abstract: New petrographic, geochemical, and isotopic (Sr, Nd, and d18?) data on olivine and pyroxene phenocrysts provide constraints on the composition and crustal evolution of primary melts of Paleoproterozoic (2.40 Ga) picrodoleritic sills in the northwest Kola province, Fennoscandian Shield. The picrodolerites form differentiated sills with S-shaped compositional profiles. Their chilled margins comprise porphyritic picrodolerite (upper margin) and olivine gabbronorite (bottom) with olivine and clinopyroxene phenocrysts. Analysis of the available data allows us to recognize three main stages in the crystallization of mineral assemblages. The central parts of large (up to 2 mm) olivine phenocrysts (Ol-1-C) crystallized at the early stage. This olivine (Mg# 85-92) is enriched in Ni (from 2845 to 3419 ppm), has stable Ni/Mg ratio, low Ti, Mn and Co concentrations, and contains tiny (up to 10 µm) diopside-spinel dendritic lamella that probably originated due to the exsolution from high Ca- and Cr- primary magmatic olivine. All these features of Ol-1-C are typical of olivine from primitive picritic and komatiitic magmas (De Hoog et al., 2010; Asafov et al., 2018). Ol-1-C contains large (up to 0.25 mm) crystalline inclusions of high-Al enstatite (Mg# 80-88) and clinopyroxene (Mg# 82-90), occasionally in association with Ti-pargasite and chromian spinel (60.4 wt.% Al2O3). These inclusions are regarded as microxenoliths of wall rock that were captured by primary melt at depths more than 30 km and preserved due to the conservation in magmatic olivine. The second stage was responsible for the crystallization of Ol-1 rim (Ol-1-R), small (up to 0.3 mm) olivine (Ol-2, Mg# 76-85) grains, and central parts of large (up to 1.5 mm) clinopyroxene (Cpx-C) phenocrysts in the mid-crustal transitional magma chamber (at a depth of 15-20 km) at 1160-1350°C. At the third stage, Cpx-C phenocrysts were overgrown by low-Mg rims (Mg# 70-72) similar in composition to the groundmass clinopyroxene from chilled picrodolerite and gabbro-dolerite in the central parts of the sills. This stage likely completed the evolution of picrodoleritic magma and occurred in the upper crust at a depth of about 5 km. All stages of picrodoleritic magma crystallization were accompanied by contamination. Primary melts were contaminated by upper mantle and/or lower crust as recognized from xenocrystic inclusions in Ol-1-C. The second contamination stage is supported by the negative values of eNd(2.40) = -1.1 in clinopyroxene phenocrysts. At the third stage, contamination likely occurred in the upper crust when ascending melts filled gentle fractures. This caused vertical whole-rock Nd heterogeneity in the sills (Erofeeva et al., 2019), and difference in Nd isotopic composition of clinopyroxene phenocrysts and doleritic groundmass. It was also recognized that residual evolved melts are enriched in radiogenic strontium but have neodymium isotopic composition similar to other samples. It could be explained by the interaction of the melts with fluid formed via decomposition of biotite from surrounding gneisses under the effect of high-temperature melts.
DS200712-0287
2006
Egorova, V.V.Egorova, V.V., Volkova, N.I., Shelepaev, R.A., Izokh, A.E.The lithosphere beneath the Sangilen Plateau, Siberia: evidence from peridotite, pyroxenite and gabbro xenoliths from alkaline basalts.Mineralogy and Petrology, Vol. 88, 3-4, pp. 419-441.RussiaAlkalic
DS200712-0288
2006
Egorova, V.V.Egorova, V.V., Volkova, N.l., Shelepaev, R.A., Izokh, A.E.The lithosphere beneath the Sangilen Plateau, Siberia: evidence from peridotite, pyroxenite and gabbro xenoliths from alkaline basalts.Mineralogy and Petrology, Vol. 88, 3-4, pp. 419-441.RussiaXenoliths
DS200712-0975
2006
Egorova, V.V.Shelepaev, R.A., Egorova, V.V., Izokh, A.E., Volkova, N.I.The lithosphere beneath the Sangilen Plateau, Siberia: evidence from peridotite, pyroxenite and gabbro xenoliths from alkaline basalts.Mineralogy and Petrology, Vol. 88, 3-4, pp. 419-441.RussiaAlkalic
DS201312-0572
2013
Eguchi, J.Manning, C., Li, Y., Eguchi, J.Fluids, subduction, and deep carbon.Goldschmidt 2013, AbstractMantleCarbon cycle
DS201811-2568
2018
Eguchi, J.Eguchi, J., Dasgupta, R.A CO2 solubility model for silicate melts from fluid saturation to graphite or diamond saturation.Chemical Geology, Vol. 487, 1, pp. 23-38.Mantlediamond genesis

Abstract: A model based on a thermodynamic framework for CO2 concentrations and speciation in natural silicate melts at graphite/diamond-saturated to fluid-saturated conditions is presented. The model is simultaneously calibrated with graphite-saturated and fluid-saturated conditions allowing for consistent model predictions across the CCO buffer. The model was calibrated using water-poor (=1?wt% H2O) silicate melts from graphite- to CO2-fluid-saturation over a range of pressure (P?=?0.05-3?GPa), temperature (T?=?950-1600?°C), composition (foidite-rhyolite; NBO?=?0.02-0.92; wt% SiO2?~?39-77, TiO2?~?0.1-5.8, Al2O3?~?7.5-18, FeO?~?0.2-24 MgO?~?0.1-24, CaO?~?0.3-14, Na2O~1-5, K2O?~?0-6), and fO2 (~QFM +1.5 to ~QFM -6). The model can predict CO2 concentrations for a wide range of silicate melt compositions from ultramafic to rhyolitic compositions, i.e., melts that dissolve carbon only as carbonate anions CO32- and those that dissolve carbon both as CO32- and as molecular CO2mol as a function of pressure, temperature, and oxygen fugacity. The model also does a reasonable job in capturing CO2 solubility in hydrous silicate melts with =2-3?wt% H2O. New CO2 solubility experiments at pressures >3?GPa suggest that the newly developed CO2 solubility model can be satisfactorily extrapolated to ~4-5?GPa. Above 5?GPa the model poorly reproduces experimental data, likely owing to structural change in silicate melt at pressures above 5?GPa. An Excel spreadsheet and a Matlab function are provided as online supplementary materials for implementing the new CO2 solubility model presented here.
DS202002-0180
2020
Eguchi, J.Eguchi, J., Seales, J., Dagupta, R.Great oxidation and Lomagundi events linked by deep cycling and enhanced degassing of carbon.Nature Geoscience, Vol. 13, pp. 71-76. Mantlecarbon

Abstract: For approximately the first 2?billion years of the Earth’s history, atmospheric oxygen levels were extremely low. It was not until at least half a billion years after the evolution of oxygenic photosynthesis, perhaps as early as 3?billion years ago, that oxygen rose to appreciable levels during the Great Oxidation Event. Shortly after, marine carbonates underwent a large positive spike in carbon isotope ratios known as the Lomagundi event. The mechanisms responsible for the Great Oxidation and Lomagundi events remain debated. Using a carbon-oxygen box model that tracks the Earth’s surface and interior carbon fluxes and reservoirs, while also tracking carbon isotopes and atmospheric oxygen levels, we demonstrate that about 2.5?billion years ago a tectonic transition that resulted in increased volcanic CO2 emissions could have led to increased deposition of both carbonates and organic carbon (organic?C)?via enhanced weathering and nutrient delivery to oceans. Increased burial of carbonates and organic?C would have allowed the accumulation of atmospheric oxygen while also increasing the delivery of carbon to subduction zones. Coupled with preferential release of carbonates at arc volcanoes and deep recycling of organic?C to ocean island volcanoes, we find that such a tectonic transition can simultaneously explain the Great Oxidation and Lomagundi events without any change in the fraction of carbon buried as organic?C relative to carbonate, which is often invoked to explain carbon isotope excursions.
DS2002-1117
2002
Eguiiluz, L.Murphy, J.B., Eguiiluz, L., Zulauf, G.Cadomen Orogens, peri-Gondwanan correlatives and Laurentia Baltica connectionsTectonophysics, Vol.352,1-2,July, pp. 1-9.Europe, BalticaTectonics
DS1989-1251
1989
Eguiluz, L.Ramon-Lluch, R., Martinez-Torres, L.M., Eguiluz, L.RAFOLD: a BASIC program for the geometric classification of foldsComputers and Geosciences, Vol. 15, No. 6, pp. 989-996GlobalComputer, Program -RAFOLD.
DS1992-1599
1992
Egydio da Silva, M.Vauchez, A., Egydio da Silva, M.Termination of a continental scale strike slip fault in partially meltedcrust: the West Pernambuco shear zone, northeast BrasilGeology, Vol. 20, No. 11, November pp. 1007-1010BrazilTectonics, Shear zone
DS2003-0574
2003
Egydio Silva, 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
DS200612-0049
2006
Egydio Silva, 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
DS2001-0091
2001
EgydiosilvaBascou, J., Barruol, Vauchez, Mainprice, EgydiosilvaEBSD measured lattice preferred orientations and seismic properties of eclogitesTectonophysics, Vol. 342, No. 2, pp. 61-80.GlobalGeophysics - seismics, Eclogites
DS2003-0573
2003
EgydioSilva, 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
EgydioSilva, 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
DS201810-2376
2018
Egydio-Silva, M.Salazar-Mora, C.A., Huismans, R.S., Fossen, H., Egydio-Silva, M.The Wilson cycle and effects of tectonic structural inheritance on rifted passive margin formations.Tectonics, doi.org/10.1029/ 2018TC004962Oceanstectonics

Abstract: The parallelism between older collisional belts and younger rift systems is widely known and particularly well portrayed along the Atlantic Ocean. How tectonic inherited and new-formed shear zones control rift nucleation and the final architecture of rifted conjugate passive margins is still poorly understood. Here we present lithospheric-scale thermo-mechanical numerical models that self-consistently create extensional and contractional tectonic inheritance, where prior extension and contraction are systematically varied. Our results show that (1) initial reactivation occurs along the former lithospheric suture zones; (2) upper crustal thick-skinned basement thrusts are partially or fully reactivated depending on the amount of prior contraction and size of the orogen; (3) with a small amount of contraction, thick-skinned thrusts are efficiently reactivated in extension and provide the template for rifted margin formation; (4) with larger amounts of contraction, thick-skinned thrusts distal to the lithospheric suture zone do not reactivate in extension; and (5) reactivation of prior contractional shear zones dominates during the early stages of rifting, while during the final stage of margin formation new-formed extensional shear zones dominate. Force balance analysis predicts an inverse relation between midcrustal viscosity and the maximum offset for reactivation of weak upper crustal structures. Force balance also predicts that the degree of weakening or healing of the weak suture and the thermal thinning of the necking area control at which stage suture reactivation is deactivated and extension proceeds by mantle lithosphere thermal necking. Two rifted conjugate margins with orogenic inheritance in the North and South Atlantic are used for comparison.
DS1988-0198
1988
Ehlen, J.Ehlen, J., Gerrard, A.J.Bibliography on the chemical weathering of granitic rocksNational Technical Information Service AD A 200, 157/6, 29p. approx. $ 13.95USGlobalBibliography -granitic weathering
DS2000-0601
2000
Ehlers, C.Ma, C., Ehlers, C., et al.The roots of the Dabie Shan ultrahigh pressure metamorphic terrane: constraints from geochemistry NdSrPrec. Research, Vol. 102, No. 3-4, Aug. pp. 303-Chinaultra high pressure (UHP), Dabie Shan
DS2000-0602
2000
Ehlers, C.Ma, C., Ehlers, C., Xu, C., Li, Z., Yang, K.The roots of the Dabie Shan ultrahigh pressure metamorphic terrane: constraints from geochemistry ...Precambrian Research, Vol. 102, No. 3-4, Aug.pp. 279-301.Chinaultra high pressure (UHP), geochronology, Dabie Shan region
DS2002-0422
2002
Ehlers, C.Ehlers, C., Farley, K.A.Apatite ( U-Th) He thermochronometry: methods and applications to problems in tectonic and surface processes.Earth and Planetary Science Letters, Vol. 206, 1-2, pp. 1-14.GlobalTectonics, Geothermometry
DS200612-0204
2006
Ehlers, C.Cagnard, F., Durrieu, N., Gapais, D., Brun, J-P, Ehlers, C.Crustal thickening and lateral flow during compression of hot lithospheres, with particular reference to Precambrian times.Terra Nova, Vol. 18, Feb. pp. 72-78.MantleGeothermometry
DS200612-0205
2006
Ehlers, C.Cagnard, F., Durrieu, N., Gapais, D., Brun, J-P., Ehlers, C.Crustal thickening and lateral flow during compression of hot lithospheres, with particular reference to Precambrian times.Terra Nova, Vol. 18, 1, Feb. pp. 72-78.MantleGeophysics - seismics
DS200612-0206
2006
Ehlers, C.Cagnard, F., Durrieu, N., Gapais, D., Brun, J-P., Ehlers, C.Crustal thickening and lateral flow during compression of hot lithospheres, with particular reference to Precambrian times.Terra Nova, Vol. 18, 1, pp. 72-78.MantleMelting
DS1982-0184
1982
Ehlers, E.G.Ehlers, E.G., Blatt, H.Carbonatites, Kimberlites and Related RocksSan Francisco: W.h. Freeman, Petrology -igneous, Sedimentary, PP. 240-244.GlobalGenesis
DS1996-1385
1996
Ehlers, K.Stuwe, K., Ehlers, K.The qualitative zoning record of minerals. a method for determining the duration of metamorphic events?Mineralogy and Petrology, Vol. 56, pp. 171-184GlobalNatural garnets, Petrology -ion exchange
DS1998-0440
1998
Ehlers, K.Foster, D.A., Ehlers, K.40Ar 39Ar thermochronology of the southern Gawler Craton - implications for East Gondwana and Rondinia.Journal of Geophysical Research, Vol. 103, No. 5, May 10, pp. 10177-94.AustraliaMesoproterozoic, Neoproterozoic, Geochronology, Gondwana
DS2003-1155
2003
Ehlers, T.A.Reiners, P.W., Zhou, Z., Ehlers, T.A., Xu, C., Brandon, M.T., Donelick, R.A.Post orogenic evolution of the Dabie Shan, eastern Chin a ( U Th) He and fission trackAmerican Journal of Science, Vol. 303, 6, pp. 489-518.ChinaGeothermometry, UHP
DS200412-1652
2003
Ehlers, T.A.Reiners, P.W., Zhou, Z., Ehlers, T.A., Xu, C., Brandon, M.T., Donelick, R.A., Nicolescu, S.Post orogenic evolution of the Dabie Shan, eastern Chin a ( U Th) He and fission track thermochronology.American Journal of Science, Vol. 303, 6, pp. 489-518.ChinaGeothermometry UHP
DS200612-1152
2006
Ehlers, T.A.Reiners, P.W., Ehlers, T.A., editorsLow temperature thermochronology: techniques, interpretations and applications.Mineralogical Society of America, Review in Mineralogy and Geochemistry, Vol. 58, 620p. approx. $ 40. business @minsocam.orgGlobalBook - thermochronology
DS201905-1051
2019
Ehlers, T.A.Koptev, A., Beniest, A., Gerya, T., Ehlers, T.A., Jolivet, L., Leroy, S.Plume induced breakup of a subducting plate: microcontinent formation without cessation of the subduction process.Geophysical Research Letters, Vol. 46, 7, pp. 3663-3675.Mantlesubduction

Abstract: Separation of microcontinental blocks from their parent continent is usually attributed to abrupt relocation of concentrated extension from the mid-oceanic ridge to the adjacent continental margin. In the context of extensional passive margin evolution, previous extensive numerical and analog studies have revealed that hot upwelling mantle flow plays a key role in the mechanical weakening of the passive margin lithosphere needed to initiate a ridge jump. This, in turn, results in continental breakup and subsequent microcontinent isolation. However, the consequences of mantle plume impingement on the base of a moving lithospheric plate that is already involved into subduction are still unexplored quantitatively. Here we present the results of 3-D thermo-mechanical models showing that even in the context of induced plate motion (contractional boundary conditions), which are necessary to sustain continuous convergence, thermal and buoyancy effects of the mantle plume emplaced at the bottom of the continental part of the subducting plate are sufficient to initiate continental breakup and the subsequent opening of a new oceanic basin that separates the microcontinental block from the main body of the continent. With these models, we show that it is physically possible to form microcontinents in a convergent setting without the cessation of subduction.
DS201212-0711
2012
Ehrardt, A.Suckro, S.K., Gohl, K., Funck, T., Heyde, I., Ehrardt, A., Schreckenberger, B., Gerlings, J., Damm, V., Jokat, W.The crustal structure of southern Baffin Bay: implications from a seismic refraction experiment.Geophysical Journal International, Vol. 190, 1, pp. 37-58.Canada, Nunavut, Baffin Island, Europe, GreenlandGeophysics - seismics
DS1975-0018
1975
Ehrenberg, S.N.Baldridge, W.S., Ehrenberg, S.N., Mcgetchin, T.R.Ultramafic Xenolith Suite from Ship Rock, New MexicoEos, Vol. 56, PP. 464-465, (abstract.).GlobalColorado Plateau, Kimberlite, Rocky Mountains
DS1975-0275
1976
Ehrenberg, S.N.Ehrenberg, S.N.Colorado Plateau Garnet Peridotite Xenoliths Strontium Analyses of Diopsides.Eos, Vol. 57, P. 1026, (abstract.).United States, Colorado PlateauBlank
DS1975-0569
1977
Ehrenberg, S.N.Mcgetchin, T.R., Smith, D., Ehrenberg, S.N., Roden, M. WILSHIRE.Navajo Kimberlites and Minettes GuideInternational Kimberlite Conference SECOND EXTENDED ABSTRACT VOLUME., Colorado PlateauKimberlite
DS1975-0734
1978
Ehrenberg, S.N.Ehrenberg, S.N.Petrology of Potassic Volcanic Rocks and Ultramafic Xenoliths from the Navajo Volcanic Field, New Mexico and Arizona.Ph.d. Thesis, University California, Los Angeles, 259P.United States, Arizona, New Mexico, Colorado PlateauMinettes
DS1975-1007
1979
Ehrenberg, S.N.Ehrenberg, S.N.Garnetiferous Ultramafic Inclusions in Minette from the Navajo Volcanic Field.International Kimberlite Conference SECOND Proceedings, Vol. 2, PP. 330-344.United States, Arizona, Colorado PlateauBlank
DS1975-1008
1979
Ehrenberg, S.N.Ehrenberg, S.N., Griffin, W.L.Garnet Granulite and Associated Xenoliths in Minette and Serpentinite Diatremes of the Colorado Plateau.Geology, Vol. 7, OCTOBER PP. 483-487.United States, Colorado PlateauBlank
DS1980-0117
1980
Ehrenberg, S.N.Ehrenberg, S.N., Ahmad, S.N., Perry, E.C.JR.Oxygen Isotopic Compositions of Garnet Granulites from Colorado Plateau Diatremes.Eos, Vol. 61, No. 17, APRIL 22ND. P. 387.United States, Colorado PlateauBlank
DS1982-0185
1982
Ehrenberg, S.N.Ehrenberg, S.N.Rare Earth Element Geochemistry of Garnet Lherzolite and Megacrystalline Nodules from Minette of the Colorado Plateau Province.Earth Planetary Sci. Letters, Vol. 57, No. 1, PP. 191-210.United States, Arizona, New Mexico, Colorado PlateauBlank
DS1982-0186
1982
Ehrenberg, S.N.Ehrenberg, S.N.Petrogenesis of Garnet Lherzolite and Megacrystalline Nodules from the Thumb, Navajo Volcanic Field.Journal of PETROLOGY, Vol. 23, No. 4, PP. 507-547.United States, Colorado Plateau, New Mexico, Arizona, UtahDiatreme, Potassic, Lamprophyre, Rare Earth Elements (ree), Geochemistry, Petrology
DS1984-0679
1984
Ehrenberg, S.N.Smith, D., Ehrenberg, S.N.Zoned Minerals in Garnet Peridotite Nodules from the Colorado Plateau: Implications for Mantle Metasomatism and Kinetics.Contributions to Mineralogy and Petrology, Vol. 86, PP. 274-285.United States, Colorado Plateau, Arizona, New Mexico, Colorado, UtahThumb, Minette, Genesis, Kimberlite, Diamonds
DS1980-0118
1980
Ehrenburg, S.N.Ehrenburg, S.N.rare earth elements (REE) GEOCHEMISTRY of GARNET PERIDOTITE XENOLITHS from the COLORADO PLATEAU.Eos, Vol. 61, No. 48, P. 1192. (abstract.).United States, Colorado PlateauBlank
DS1982-0187
1982
Ehrenwald, J.Ehrenwald, J.The Art of Laser Sawing DiamondsIn: International Gemological Symposium Proceedings Volume, PP. 237-242.GlobalDiamond Cutting
DS1994-1896
1994
Ehrhardt, H.Weiller, M., Sattel, S., Jung, K., Ehrhardt, H.Is C(60) fullerite harder than diamondPhys. Lett. A., Vol. 188, No. 3, May 23, pp. 281-286.GlobalFullerite, Carbon
DS201610-1877
2016
Ehrig, K.Kamenetsky, V.S., Maas, R., Kamenetsky, M.B., Yaxley, G.M., Ehrig, K., Zellmer, G.F., Bindeman, I.N., Sobolev, A.V., Kuzmin, D.V., Ivanov, A.V., Woodhead, J., Schilling, J-G.Multiple mantle sources of continental magmatism: insights from "high-Ti" picrites of Karoo and other large igneous provinces.Chemical Geology, in press available 10p.Africa, South AfricaLIP magmatism

Abstract: Magmas forming large igneous provinces (LIP) on continents are generated by extensive melting in the deep crust and underlying mantle and associated with break-up of ancient supercontinents, followed by formation of a new basaltic crust in the mid-oceanic rifts. A lack of the unifying model in understanding the sources of LIP magmatism is justified by lithological and geochemical complexity of erupted magmas on local (e.g. a cross-section) and regional (a single and different LIP) scales. Moreover, the majority of LIP rocks do not fit general criteria for recognizing primary/primitive melts (i.e. < 8 wt% MgO and absence of high-Fo olivine phenocrysts). This study presents the mineralogical (olivine, Cr-spinel, orthopyroxene), geochemical (trace elements and Sr-Nd-Hf-Pb isotopes) and olivine-hosted melt inclusion compositional characteristics of a single primitive (16 wt% MgO), high-Ti (2.5 wt% TiO2) picrite with high-Mg olivine (up to 91 mol% Fo) from the Letaba Formation in the ~ 180 Ma Karoo LIP (south Africa). The olivine compositions (unusually high d18O (6.17‰), high NiO (0.36-0.56 wt%) and low MnO and CaO (0.12-0.20 and 0.12-0.22 wt%, respectively)) are used to argue for a non-peridotitic mantle source. This is supported by the enrichment of the rock and melts in most incompatible trace elements and depletion in heavy rare earth elements (e.g. high Gd/Yb) that reflects residual garnet in the source of melting. The radiogenic isotopes resemble those of the model enriched mantle (EM-1) and further argue for a long-term enrichment of the source in incompatible trace elements. The enriched high-Ti compositions, strongly fractionated incompatible trace elements, presence of primitive olivine and high-Cr spinel in the Letaba picrites are closely matched by olivine-phyric rocks from the ~ 260 Ma Emeishan (Yongsheng area, SW China) and ~ 250 Ma Siberian (Maimecha-Kotuy region, N Siberia) LIPs. However, many other compositional parameters (e.g. trace element and d18O compositions of olivine phenocrysts, Fe2 +/Fe3 + in Cr-spinel, Sr-Nd-Hf isotope ratios) only partially overlap or even diverge. We thus imply that parental melts of enriched picritic rocks with forsteritic olivine from three major continental igneous provinces - Karoo, Emeishan and Siberia cannot be assigned to a common mantle source and similar melting conditions. The Karoo picrites also exhibit some mineralogical and geochemical similarities with rocks and glasses in the south Atlantic Ridge and adjacent fracture zones. The geodynamic reconstructions of the continental plate motions since break-up of the Gondwanaland in the Jurassic support the current position of the source of the Karoo magmatism in the southernmost Atlantic. Co-occurrence of modern and recent anomalous rocks with normal mid-ocean ridge basalts in this region can be related to blocks/rafts of the ancient lithosphere, stranded in the ambient upper mantle and occasionally sampled by rifting-related decompressional melting.
DS201707-1337
2017
Ehrig, K.Kamenetsky, V.S., Maas, R., Kamenetsky, M.B., Yaxley, G.M., Ehrig, K., Zellmer, G.F., Bindeman, I.N., Sobolev, A.V., Kuzmin, D.V., Ivanov, A.V., Woodhead, J., Schilling, J-G.Multiple mantle sources of continental magmatism: insights from high Ti picrites of Karoo and other large igneous provinces.Chemical Geology, Vol. 455, pp. 22-31.Africa, South Africamagmatism

Abstract: Magmas forming large igneous provinces (LIP) on continents are generated by extensive melting in the deep crust and underlying mantle and associated with break-up of ancient supercontinents, followed by formation of a new basaltic crust in the mid-oceanic rifts. A lack of the unifying model in understanding the sources of LIP magmatism is justified by lithological and geochemical complexity of erupted magmas on local (e.g. a cross-section) and regional (a single and different LIP) scales. Moreover, the majority of LIP rocks do not fit general criteria for recognizing primary/primitive melts (i.e. < 8 wt% MgO and absence of high-Fo olivine phenocrysts). This study presents the mineralogical (olivine, Cr-spinel, orthopyroxene), geochemical (trace elements and Sr-Nd-Hf-Pb isotopes) and olivine-hosted melt inclusion compositional characteristics of a single primitive (16 wt% MgO), high-Ti (2.5 wt% TiO2) picrite with high-Mg olivine (up to 91 mol% Fo) from the Letaba Formation in the ~ 180 Ma Karoo LIP (south Africa). The olivine compositions (unusually high d18O (6.17‰), high NiO (0.36–0.56 wt%) and low MnO and CaO (0.12–0.20 and 0.12–0.22 wt%, respectively)) are used to argue for a non-peridotitic mantle source. This is supported by the enrichment of the rock and melts in most incompatible trace elements and depletion in heavy rare earth elements (e.g. high Gd/Yb) that reflects residual garnet in the source of melting. The radiogenic isotopes resemble those of the model enriched mantle (EM-1) and further argue for a long-term enrichment of the source in incompatible trace elements. The enriched high-Ti compositions, strongly fractionated incompatible trace elements, presence of primitive olivine and high-Cr spinel in the Letaba picrites are closely matched by olivine-phyric rocks from the ~ 260 Ma Emeishan (Yongsheng area, SW China) and ~ 250 Ma Siberian (Maimecha-Kotuy region, N Siberia) LIPs. However, many other compositional parameters (e.g. trace element and d18O compositions of olivine phenocrysts, Fe2 +/Fe3 + in Cr-spinel, Sr-Nd-Hf isotope ratios) only partially overlap or even diverge. We thus imply that parental melts of enriched picritic rocks with forsteritic olivine from three major continental igneous provinces – Karoo, Emeishan and Siberia cannot be assigned to a common mantle source and similar melting conditions. The Karoo picrites also exhibit some mineralogical and geochemical similarities with rocks and glasses in the south Atlantic Ridge and adjacent fracture zones. The geodynamic reconstructions of the continental plate motions since break-up of the Gondwanaland in the Jurassic support the current position of the source of the Karoo magmatism in the southernmost Atlantic. Co-occurrence of modern and recent anomalous rocks with normal mid-ocean ridge basalts in this region can be related to blocks/rafts of the ancient lithosphere, stranded in the ambient upper mantle and occasionally sampled by rifting-related decompressional melting.
DS201708-1563
2017
Ehrig, K.Abersteiner, A., Kamanetsky, V.S., Kamenetsky, M., Goemann, K., Ehrig, K., Rodemann, T.Significance of halogens ( F, Cl) in kimberlite melts: insights from mineralogy and melt inclusions in the Roger pipe ( Ekati, Canada).Chemical Geology, in press available, 16p.Canada, Northwest Territoriesdeposit, Roger, Ekati

Abstract: The abundance and distribution of halogens (F, Cl) are rarely recorded in kimberlites and therefore their petrogenetic significance is poorly constrained. Halogens are usually present in kimberlite rocks in the structure of phlogopite and apatite, but their original concentrations are never fully retained due to the effects of alteration. To provide new constraints on the origin and evolution of halogens in kimberlites and their melts, we present a detailed study of the petrography and geochemistry of the late-Cretaceous Group-I (or archetypal) Roger kimberlite (Ekati cluster, Canada). The studied samples contain abundant anhedral-to-euhedral olivine which is set in a crystalline groundmass of monticellite, phlogopite, apatite, spinel (i.e. magnesian ulvöspinel-magnetite (MUM), Mg-magnetite, pleonaste, Cr-spinel), and perovskite along with abundant secondary alteration phases (i.e. serpentine, garnet (andradite-schlorlomite), amakinite ((Fe2 +, Mg, Mn)(OH)2), calcite). The Roger kimberlite is characterised by the highest recorded F-content (up to 2688 ppm) of the Ekati cluster kimberlites, which is reflected by the preservation of F-rich phases, where bultfonteinite (Ca4(Si2O7)(F, OH)2) and fluorite commonly replace olivine. In order to examine the composition and evolution of the kimberlite melt prior to post-magmatic processes, we studied melt inclusions in olivine, Cr-spinel, monticellite and apatite. Primary multiphase melt inclusions in Cr-spinel, monticellite and apatite and secondary inclusions in olivine are shown to contain a diversity of daughter phases and compositions that are dominated by alkali/alkali-earth (Na, K, Ba, Sr)-enriched Ca-Mg-carbonates ± F, Na-K-chlorides and sulphates, phosphates ± REE, spinel, silicates (e.g. olivine, phlogopite, (clino)humite), and sulphides. Although alkali/alkali-earth- and halogen-bearing phases are abundant in melt inclusions, they are generally absent from the kimberlite groundmass, most likely due to ubiquitous effects of syn- and/or post-magmatic alteration (i.e. serpentinisation). Comparisons between halogens and other trace elements of similar compatibility (i.e. F/Nd and Cl/U) in the Roger kimberlite and their respective estimated primitive mantle abundances show that halogens should be a more significant component in kimberlites than typically measured. We propose that fluorine in the Roger kimberlite was magmatic and was redistributed during hydrothermal alteration by Ca-bearing serpentinising fluids to produce the observed bultfonteinite/fluorite assemblages. Based the compositions and daughter mineral assemblages in primary melt inclusions and reconstructed halogen abundances, we suggest that Cr-spinel, monticellite and apatite crystallised from a variably differentiated Si-P-Cl-F-bearing carbonate melt that was enriched in alkalis/alkali-earths and highly incompatible trace elements
DS201708-1564
2017
Ehrig, K.Abersteiner, A., Kamanetsky, V.S., Pearson, D.G., Kamenetsky, M., Ehrig, K., Goemann, K., Rodemann, T.Monticellite in group I kimberlites: implications for evolution of parallel melts and post emplacement CO2 degassing. Leslie, Pipe 1Chemical Geology, in press available, 54p.Canada, Northwest Territories, Europe, Finlanddeposit, Leslie

Abstract: Monticellite is a magmatic and/or deuteric mineral that is often present, but widely varying in concentrations in Group-I (or archetypal) kimberlites. To provide new constraints on the petrogenesis of monticellite and its potential significance to kimberlite melt evolution, we examine the petrography and geochemistry of the minimally altered hypabyssal monticellite-rich Leslie (Canada) and Pipe 1 (Finland) kimberlites. In these kimberlites, monticellite (Mtc) is abundant (25–45 vol%) and can be classified into two distinct morphological types: discrete and intergrown groundmass grains (Mtc-I), and replacement of olivine (Mtc-II). Monticellite in group-I kimberlites: Implications for evolution of parental melts and post-emplacement CO 2 degassing (PDF Download Available).
DS201802-0216
2018
Ehrig, K.Abersteiner, A., Kamenetsky, V.S., Kamenetsky, M., Goemann, K., Ehrig, K., Rodemann, T.Significance of halogens ( F, Cl) in kimberlite melts: insights from mineralogy and melt inclusions in the Roger pipe ( Ekati, Canada).Chemical Geology, Vol. 478, pp. 148-163.Canada, Northwest Territoriesdeposit - Roger

Abstract: The abundance and distribution of halogens (F, Cl) are rarely recorded in kimberlites and therefore their petrogenetic significance is poorly constrained. Halogens are usually present in kimberlite rocks in the structure of phlogopite and apatite, but their original concentrations are never fully retained due to the effects of alteration. To provide new constraints on the origin and evolution of halogens in kimberlites and their melts, we present a detailed study of the petrography and geochemistry of the late-Cretaceous Group-I (or archetypal) Roger kimberlite (Ekati cluster, Canada). The studied samples contain abundant anhedral-to-euhedral olivine which is set in a crystalline groundmass of monticellite, phlogopite, apatite, spinel (i.e. magnesian ulvöspinel-magnetite (MUM), Mg-magnetite, pleonaste, Cr-spinel), and perovskite along with abundant secondary alteration phases (i.e. serpentine, garnet (andradite-schlorlomite), amakinite ((Fe2 +, Mg, Mn)(OH)2), calcite). The Roger kimberlite is characterised by the highest recorded F-content (up to 2688 ppm) of the Ekati cluster kimberlites, which is reflected by the preservation of F-rich phases, where bultfonteinite (Ca4(Si2O7)(F, OH)2) and fluorite commonly replace olivine. In order to examine the composition and evolution of the kimberlite melt prior to post-magmatic processes, we studied melt inclusions in olivine, Cr-spinel, monticellite and apatite. Primary multiphase melt inclusions in Cr-spinel, monticellite and apatite and secondary inclusions in olivine are shown to contain a diversity of daughter phases and compositions that are dominated by alkali/alkali-earth (Na, K, Ba, Sr)-enriched Ca-Mg-carbonates ± F, Na-K-chlorides and sulphates, phosphates ± REE, spinel, silicates (e.g. olivine, phlogopite, (clino)humite), and sulphides. Although alkali/alkali-earth- and halogen-bearing phases are abundant in melt inclusions, they are generally absent from the kimberlite groundmass, most likely due to ubiquitous effects of syn- and/or post-magmatic alteration (i.e. serpentinisation). Comparisons between halogens and other trace elements of similar compatibility (i.e. F/Nd and Cl/U) in the Roger kimberlite and their respective estimated primitive mantle abundances show that halogens should be a more significant component in kimberlites than typically measured. We propose that fluorine in the Roger kimberlite was magmatic and was redistributed during hydrothermal alteration by Ca-bearing serpentinising fluids to produce the observed bultfonteinite/fluorite assemblages. Based the compositions and daughter mineral assemblages in primary melt inclusions and reconstructed halogen abundances, we suggest that Cr-spinel, monticellite and apatite crystallised from a variably differentiated Si-P-Cl-F-bearing carbonate melt that was enriched in alkalis/alkali-earths and highly incompatible trace elements.
DS201802-0217
2018
Ehrig, K.Abersteiner, A., Kamenetsky, V.S., Pearson, D.G., Kamenetsky, M., Goemann, K., Ehrig, K., Rodemann, T.Monticellite in group I kimberlites: implications for evolution of parental melts and post emplacement CO2 degassing.Chemical Geology, Vol. 478, pp. 76-88.Canada, Northwest Territories, Europe, Finlanddeposit - Leslie, Pipe 1

Abstract: Monticellite is a magmatic and/or deuteric mineral that is often present, but widely varying in concentrations in Group-I (or archetypal) kimberlites. To provide new constraints on the petrogenesis of monticellite and its potential significance to kimberlite melt evolution, we examine the petrography and geochemistry of the minimally altered hypabyssal monticellite-rich Leslie (Canada) and Pipe 1 (Finland) kimberlites. In these kimberlites, monticellite (Mtc) is abundant (25-45 vol%) and can be classified into two distinct morphological types: discrete and intergrown groundmass grains (Mtc-I), and replacement of olivine (Mtc-II). Primary multiphase melt inclusions in monticellite, perovskite and Mg-magnetite contain assemblages dominated by alkali (Na, K, Ba, Sr)-enriched Ca-Mg-carbonates, chlorides, phosphates, spinel, silicates (e.g. olivine, phlogopite) and sulphides. These melt inclusions probably represent snapshots of a variably differentiated kimberlite melt that evolved in-situ towards carbonatitic and silica-poor compositions. Although unconstrained in their concentration, the presence of alkali-carbonates and chlorides in melt inclusions suggests they are a more significant component of the kimberlite melt than commonly recorded by whole-rock analyses. We present petrographic and textural evidence showing that pseudomorphic Mtc-II resulted from an in-situ reaction between olivine and the carbonate component of the kimberlite melt in the decarbonation reactio. This reaction is supported by the preservation of abundant primary inclusions of periclase and to a lesser extent Fe-Mg-oxides in monticellite, perovskite and Mg-magnetite. Based on the preservation of primary periclase inclusions, we infer that periclase also existed in the groundmass, but was subsequently altered to brucite. We suggest that CO2 degassing in the latter stages of kimberlite emplacement into the crust is largely driven by the observed reaction between olivine and the carbonate melt. For this reaction to proceed, CO2 should be removed (i.e. degassed), which will cause further reaction and additional degassing in response to this chemical system change (Le Chatelier's principle). Our study demonstrates that these proposed decarbonation reactions may be a commonly overlooked process in the crystallisation of monticellite and exsolution of CO2, which may in turn contribute to the explosive eruption and brecciation processes that occur during kimberlite magma emplacement and pipe formation.
DS202008-1365
2020
Ehrig, K.Abersteiner, A., Kamenetsky, V.S., Goemann, K., Kjarsgaard, B.A., Fedortchouk, Y., Ehrig, K., Kamenetsky, M.Evolution of kimberlite magmas in the crust: a case study of groundmass and mineral hosted inclusions in the Mark kimberlite ( Lac de Gras, Canada).Lithos, in press available, 55p. PdfCanada, Northwest Territoriesdeposit - Mark

Abstract: Kimberlites are the surface manifestation of deeply-derived (>150 km) and rapidly ascended magmas. Fresh kimberlite rocks are exceptionally rare, as most of them are invariably modified by pervasive deuteric and/or post-magmatic fluids that overprint the original mineralogy. In this study, we examined fresh archetypal kimberlite from the Mark pipe (Lac de Gras, Canada), which is characterised by well-preserved olivine and groundmass minerals. The sequence of crystallisation of the parental melt and its major compositional features, including oxygen fugacity, were reconstructed using textural relationships between magmatic minerals, their zoning patterns and crystal/melt/fluid inclusions. Crystal and multiphase primary, pseudosecondary and secondary melt/fluid inclusions in olivine, Cr-diopside, spinel, perovskite, phlogopite/kinoshitalite, apatite and calcite preserve a record of different stages of kimberlite melt evolution. Melt/fluid inclusions are generally more depleted in silica and more enriched in alkalis (K, Na), alkali-earth (Ba, Sr) and halogens (Cl, F) relative to the whole-rock composition of the Mark kimberlite. These melt/fluid inclusion compositions, in combination with presence of elevated CaO (up to 1.73 wt%), in Mg-rich olivine rinds, crystallisation of groundmass kinoshitalite, carbonates (calcite, Sr-Ba-bearing) and alkali-enriched rims around apatite suggest that there was progressive enrichment in CO2, alkalis and halogens in the evolving parental melt. The Mark kimberlite groundmass is characterised by the following stages of in-situ crystallisation: (1) olivine rims around xenocrystic cores + Cr-spinel/TIMAC. (2) Mg-rich olivine rinds around olivine rims/cores + MUM-spinel (followed by pleonaste and Mg-magnetite) + monticellite (+ partial resorption of olivine, along with the formation of ferropericlase and CO2 as a result of decarbonation reactions) + perovskite + apatite. (3) Olivine outmost rinds, which are coeval with phlogopite/kinoshitalite + apatite + sulphides + carbonate (calcite, Ba-Sr-Na-bearing varieties). In addition, oxygen fugacity of the Mark kimberlite was constrained by olivine-chromite, perovskite and monticellite oxygen barometry and showed that the parental melt became progressively more oxidised in response to fractional crystallisation. (4) Deuteric (i.e. late-stage magmatic) and/or post-magmatic (i.e. external fluids) alteration of magmatic minerals (e.g., olivine, monticellite, ferropericlase) and crystallisation of mesostasis serpentine, K-bearing chlorite and brucite (i.e. replacement of ferropericlase). The absence of any alkali (Na, K) and halogen (F, Cl) rich groundmass minerals in the Mark kimberlite may be attributed to these elements becoming concentrated in the late-stage melt where they potentially formed unstable, water-soluble carbonates (such as those observed in melt inclusions). Consequently, these minerals were most likely removed from the groundmass by deuteric and/or post-magmatic alteration.
DS200812-0836
2008
Ehrlich, D.Pagot, E., Pesaresi, M., Buda, D., Ehrlich, D.Development of an object oriented classification model using very high resolution satellite imagery for monitoring diamond mining activity.International Journal of Remote Sensing, Vol. 29, 2, Jan. pp. 499-512.AfricaRemote sensing - mine
DS2003-0376
2003
Ehrlich, E.I.Ehrlich, E.I., Hausel, W.D.Timing of kimberlite magmatism and different types of diamond bearing complexes8ikc, Www.venuewest.com/8ikc/program.htm, Session 1 POSTER abstractGlobalKimberlite geology and economics
DS1960-0379
1963
Ehrlich, E.N.Milashev, V.A., Krutoyarski, M.A., Rabhkin, M.I., Ehrlich, E.N.Kimberlitic Rocks and Picritic Porphyries of the North Eastern Part of the Siberian PlatformNiiga., Gosgeoltekizdat., Vol. 126, PP. 1-10.5.RussiaMineral Chemistry
DS201212-0063
2012
Ehrman, S.Bedini, A., Ehrman, S., Nunziante Cesaro, S., Pasini, M., Rapinesi, I.A., Sali, D.The Vallerano diamond from ancient Rome: a scientific study.Gems & Gemology, Vol. 48, 1, pp.TechnologyDiamond - notable
DS201212-0064
2012
Ehrman, S.Bedini, A., Ehrman, S., Nunziante Cesaro, S., Pasini, M., Rapinesi, I.A., Sali, D.The Vallerano diamond from ancient Rome: a scientific study.Gems & Gemology, Vol. 48, 1, Spring pp. 39-41.GlobalHistory - diamond notable
DS1994-1844
1994
Ehydio-Silva, M.Vauchez, A., Tommasi, A., Ehydio-Silva, M.Self indentation of a heterogeneous continental lithosphereGeology, Vol. 22, No. 11, November pp. 967-970.BrazilCraton, Sao Francisco
DS201212-0569
2012
Eicheberg, D.Porritt, L.A., Russell, J.K., McLean, H., Fomrades, G., Eicheberg,D.Geology and volcanology of the A418 kimberlite pipe, NWT, Canada10th. International Kimberlite Conference Feb. 6-11, Bangalore India, AbstractCanada, Northwest TerritoriesDeposit - A418
DS201012-0182
2010
Eichelberger, J.Eichelberger, J.Messy magma mixtures. ( Andesite magmas but process of interest).Nature Geoscience, Vol. 3, pp. 593-594.MantleMagmatism
DS1990-0284
1990
Eichelberger, J.C.Carrigan, C.R., Eichelberger, J.C.Zoning of magmas by viscosity in volcanic conduitsNature, Vol. 343, No. 6255, Jan. 18, pp. 248-251GlobalMagmas, Layered intrusions-zoning
DS1990-0285
1990
Eichelberger, J.C.Carrigan, C.R., Eichelberger, J.C.Zoning of magmas by viscosity in volcanic conduitsNature, Vol. 343, Jan. 18, pp; 248-9.MantleVolcanics - eruptions, Core
DS1992-0222
1992
Eichelberger, J.C.Carrigan, C.R., Schubert, G., Eichelberger, J.C.Thermal and dynamical regimes of single and two phase magmatic flow indikesJournal of Geophysical Research, Vol. 97, No. B12, November 10, pp. 17, 377-17, 392GlobalDikes, Theoretical petrology
DS1995-0485
1995
Eichelberger, J.C.Eichelberger, J.C.Silicic volcanism: ascent of viscous magmas from crustal reservoirsAnnual Review of Earth Planetary Sciences, Vol. 23, pp. 41-64GlobalMagmas, volcanism.
DS2000-0265
2000
Eichelberger, J.C.Eichelberger, J.C., Chertkoff, D.G., Dreher, NyeMagmas in collision: rethinking chemical zonation in silicic magmasGeology, Vol. 28, No. 7, July, pp. 603-6.GlobalMagmatism - differentiation, calderas
DS200812-0517
2008
Eichenber, D.Janson, G.F., Muehlenbachs, K., Stachel, T., Eichenber, D.Microscale variations in D13 C evidence for growth of coated Diavik diamonds from kimberlite derived fluid.Northwest Territories Geoscience Office, p. 38. abstractCanada, Northwest TerritoriesDeposit - Diavik
DS200712-0207
2007
Eichenberg, D.Creighton, S., Luth, R.W., Stachel, T., Eichenberg, D., Whiteford, S.Oxidation states of the lithospheric mantle beneath the Central Slave Craton.Geological Association of Canada, Gac-Mac Yellowknife 2007, May 23-25, Volume 32, 1 pg. abstract p.18,19.Canada, Northwest TerritoriesDeposit - Diavik
DS200812-0250
2007
Eichenberg, D.Creighton, S., Stachel, T., McLean, H., Muehlenbachs, K., Simonett, A., Eichenberg, D., Luth, R.Diamondiferous peridotitic microxenoliths from the Diavik diamond mine, NT.Contributions to Mineralogy and Petrology, Vol.155, 5, pp. 541-554.Canada, Northwest TerritoriesDeposit - Diavik, mineral inclusions, chemistry
DS200812-0314
2008
Eichenberg, D.Eichenberg, D.The Diavik A154 open pit - geology and mining from start to finish.Northwest Territories Geoscience Office, p. 24. abstractCanada, Northwest TerritoriesBrief overview - Rio Tinto
DS200812-0516
2007
Eichenberg, D.Janson, G., Muehlenbachs, K., Stachel, T., Eichenberg, D.Cyclic growth conditions for Diavik diamonds? Insights from carbon isotopes.35th. Yellowknife Geoscience Forum, Abstracts only p. 28.Canada, Northwest TerritoriesDiamond morphology - Diavik
DS200812-1332
2008
Eichenberg, D.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
DS200912-0137
2009
Eichenberg, D.Creighton, S., Stachel, T., Eichenberg, D., Luth, R.W.Oxidation state of the lithospheric mantle beneath Diavik diamond mine, central Slave craton, NWT, Canada.Contributions to Mineralogy and Petrology, in press available 13p.Canada, Northwest TerritoriesDeposit - Diavik
DS200912-0138
2009
Eichenberg, D.Creighton, S., Stachel, T., Eichenberg, D., Luth, R.W.Oxidation state of the lithospheric mantle beneath Diavik diamond mine, central Slave craton, NWT, Canada.Mineralogy and Petrology, in press available format 13p.Canada, Northwest TerritoriesDeposit - Diavik
DS200912-0472
2009
Eichenberg, D.Marcheggiani-Croden, V., Hunt, L., Stachel, T., Muehlenbachs, K., Eichenberg, D.Diavik boart - unrelated to gem diamond and fibrous coats?37th. Annual Yellowknife Geoscience Forum, Abstracts p. 81-2.Canada, Northwest TerritoriesBoart diamond
DS201012-0024
2009
Eichenberg, D.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
DS201012-0130
2010
Eichenberg, D.Creighton, S., Stachel, T., Eichenberg, D., Luth, R.W.Oxidation state of the lithospheric mantle beneath Diavik diamond mine, central Slave Craton, NWT, Canada.Contributions to Mineralogy and Petrology, Vol. 159, 5, pp. 645-659.Canada, Northwest TerritoriesDeposit - Diavik
DS201212-0319
2012
Eichenberg, D.Hunt, L., Marcheggliani-Croden, V., Stachel, T., Muehlenbachs, K., Eichenberg, D.Polycrystalline and fibrous diamonds from the Diavik mine, Canada.10th. International Kimberlite Conference Held Bangalore India Feb. 6-11, Poster abstractCanada, Northwest TerritoriesDeposit - Diavik
DS201412-0704
2013
Eichenberg, D.Porrit, L-A., Russell, J.K., McLean, H., Fomradas, G., Eichenberg, D.A phreatomagmatic kimberlite: the 418A kimberlite pipe, Northwest Territories, Canada.Proceedings of the 10th. International Kimberlite Conference, Vol. 2, pp. 97-108.Canada, Northwest TerritoriesDeposit - 418A
DS201708-1657
2017
Eichenberg, D.Campebll, D., Puumala, M., Eichenberg, D., Riemer, W., Wahl, R.Diamond field trip Marathon-White Ricer area. Guidebook, 15p. Pdf availableCanada, Ontarioguidebook
DS201812-2852
2018
Eichenberg, D.Moss, S., Porritt, L., Pollock, K., Fomradas, G., Stubley, M., Eichenberg, D., Cutts, J.Diavik deposit: Geology, mineral chemistry, and structure of the kimberlites at Diavik diamond mine: indicators of cluster-scale cross-fertilization, mantle provenance, and pipe morphology.Society of Economic Geology Geoscience and Exploration of the Argyle, Bunder, Diavik, and Murowa Diamond Deposits, Special Publication no. 20, pp. 287-318.Canada, Northwest Territoriesdeposit - Diavik
DS1860-0432
1884
Eichstadt, F.Eichstadt, F.Anomit Fran Alno, Vesternorrlands LanGeol. Foren. Forhandl., Vol. 7, PP. 194-196.Europe, Norway, ScandinaviaAlkaline rocks
DS1998-1204
1998
EideRakotosolofo, N.A., Torsvik, Ashwal, De Wit, EideMadagascar during the Late Paleozoic and MesozoicJournal of African Earth Sciences, Vol. 27, 1A, p. 148. AbstractMadagascarTectonics
DS1998-1477
1998
EideTorsvik, T., Tucker, Ashwal, Eide, Rakotosolofo, De WitMadagascar: Cretaceous volcanism and the Marian hot spotJournal of African Earth Sciences, Vol. 27, 1A, p. 197. AbstractMadagascarvolcanism., Plume
DS200512-0089
2005
Eide, E.Bingen, B., Eide, E., Stein, H.Geochronology of orogenic processes: crystal-chemical to continental scale interpretations.Lithos, In press,MantleGeochemistry, geochronology
DS1991-1930
1991
Eide, E.A.Zhiou Gaozhi, Liou, J.G., Eide, E.A., Zhang, R.Y.X., Wang, W.G.Mineral parageneses of eclogites in both ultrahigh pressure and high pressure metamorphic belts from central Chin a #2Eos Transactions, Vol. 72, No. 44, October 29, abstract p. 558ChinaEclogites, Petrology
DS1994-0488
1994
Eide, E.A.Eide, E.A., McWilliams, M.O., Liou, J.G.40 Ar-39 Ar geochronology and exhumation of high pressure to ultrahigh pressure metamorphic rocks.Geology, Vol. 22, No. 7, July pp. 601-604.ChinaGeochronology, Argon, Dabie Mountains
DS1995-0429
1995
Eide, E.A.Dobrzhinetskaya, L.F., Eide, E.A., et al.Microdiamond in high grade metamorphic rocks of the western gneiss Norway.Geology, Vol. 23, No. 7, July pp. 597-600.NorwayMicrodiamonds, Spectrometry
DS1995-0486
1995
Eide, E.A.Eide, E.A.A model for the tectonic history of HP and ultra high pressure metamorphic regions in east centralChina.Cambridge University of Press, pp. 391-426.ChinaMetamorphic rocks, Tectonics
DS1995-0487
1995
Eide, E.A.Eide, E.A., Torsvik, T.H.Paleozoic continental collision and mantle flushing: coupled surface-mantle processes and Klaman interval.Eos, Vol. 76, No. 46, Nov. 7. p.F172. Abstract.MantleRodinia, Gondwana, Pangea
DS1998-0830
1998
Eide, E.A.Larsen, R.B., Eide, E.A., Burke, E.A.J.Evolution of metamorphic volatiles during exhumation of microDiamond bearing granulites Western Gneiss Region.Contributions to Mineralogy and Petrology, Vol. 133, No. 1-2, pp. 106-27.NorwayMicrodiamond, metamorphism
DS1999-0468
1999
Eide, E.A.Meert, J.G., Torsvik, T.H., Eide, E.A., Dahlgren, S.Tectonic significance of the Fen Province: constraints from geochronology and PaleomagnetismJournal of Geology, Vol. 106, No. 5, Sept. pp. 553-64.NorwayTectonics, Dikes
DS2001-1164
2001
Eide, E.A.Torsvik, T.H., Ashwal, L.D., Tucker, R.D., Eide, E.A.Neoproterozoic geochronology and paleogeochronology of the Seyschelles microcontinent: the India link.Precambrian Research, Vol. 110, pp. 47-60.IndiaPaleomagetisM., Geochronology
DS1996-0940
1996
Eide, E.E.Meert, J.G., Torsvik, T.H., Eide, E.E.Paleomagnetic investigation of the NeoProterozoic Fen Carbonatite Complex:contraints on rifting...Geological Society of America, Abstracts, Vol. 28, No. 7, p. A-494.NorwayTectonics - Neoproterozoic, Laurentia, Baltica
DS200512-0910
2005
Eide, J.L.Root, D.B., Hacker, B.R., Gans, P.B., Ducea, E.A., Eide, J.L.Discrete ultrahigh prssure domains in the Western Gneiss region, Norway: implications for formation and exhumation.Journal of Metamorphic Geology, Vol. 23, 1, pp. 45-61.Europe, NorwayUHP
DS1986-0212
1986
Eidel, I.J.Eidel, I.J., Frost, J.K., Goodwin, J.H.Hole into basement to explore earth's crustGeotimes, Vol. 31, No. 9, pp. 11-13GlobalTectonics
DS1989-0397
1989
Eidel, J.J.Eidel, J.J., Baxter, J.W.Spatial and geochemical relationship of Illinois-Kentucky fluorspar district to Reelfoot Rift and Rough CreekGrabenGeological Society of America (GSA) Annual Meeting Abstracts, Vol. 21, No. 6, p. A7. AbstractGlobalTectonics, Geochemistry
DS1989-0820
1989
Eidel, J.J.Kolata, D.R., Nelson, W.J., Eidel, J.J.Tectonic history of the Illinois Basin- an overviewUnited States Geological Survey (USGS) Open file, United States Geological Survey (USGS)-Missouri G.S. Symp: Mineral resource potential of, p. 19-20. (abstract.)GlobalMidcontinent, Tectonics
DS1990-0440
1990
Eidel, J.J.Eidel, J.J.Interior cratonic basinsAmerican Association of Petroleum Geologists Memoir, No. 51, 819p. approx. $ 199.00 United StatesGlobalCraton, Basins
DS1992-0583
1992
Eidel, J.J.Goldhaber, M.B., Eidel, J.J.Mineral resources of the Illinois Basin in the context of basin evolutionUnited States Geological Survey (USGS) Open File, No. 92-0001, 68p. $ 11.25Kentucky, IllinoisMineral resources, Tectonics
DS201312-0238
2013
Eidsvik, J.Eidsvik, J., Ellefmo, S.L.The value of information in mineral exploration within a multi-gaussian framework.Mathematical Geosciences, Vol. 45, 7, pp. 777-798.TechnologyNot specific to diamonds
DS2002-1099
2002
Eigendorf, G.Mossman, D.J., Eigendorf, G., Tokarvk, D., Gauthier-Lafave, Guckert, MelezhikThe search for fullerenes in carbonaceous substances associated with the natural11th. Quadrennial Iagod Symposium And Geocongress 2002 Held Windhoek, Abstract p. 38.GabonFullerenes
DS200412-0511
2004
Eiler, J.Eiler, J.Inside the subduction factory.American Geophysical Monograph Series, , Vol. 128, 324p. $ 73. agu.org/pubs.Africa, Central African RepublicSubduction, slabs, thermal structure, rheology
DS200512-0511
2004
Eiler, J.Kent, A.J.R., Stolper, E.M., Francis, D., Woodhead, J., Frei, R., Eiler, J.Mantle heterogeneity during the formation of the North Atlantic igneous province: constraints from trace element and Sr Nd Os O isotope - Baffin Island picritesGeochemistry, Geophysics, Geosystems: G3, Vol. 5, pp. Q11004 10.1029/2004GC000743Canada, Nunavut, Baffin IslandGeochemistry
DS200612-0368
2006
Eiler, J.Eiler, J.Messages from the past - the signature of ancient subduction.Goldschmidt Conference 16th. Annual, S4-02 theme abstract 1/8p. goldschmidt2006.orgMantleSubduction
DS201112-1103
2011
Eiler, J.Wang, Z., Bucholz, C., Skinner, B., Shimizu, N., Eiler, J.Oxygen isotope constraints on the origin of high Cr garnets from kimberlites.Earth and Planetary Science Letters, Vol. 312, 3-4, pp. 337-347.TechnologyGeochronology
DS1998-0386
1998
Eiler, J.M.Eiler, J.M., McInnes, B., Stolper, E.M.Oxygen isotope evidence for slab derived fluids in sub-arc mantleNature, Vol. 393, No. 6687, June 25, pp. 777-781.MantleSubduction, Arc - slab
DS2001-0292
2001
Eiler, J.M.Eiler, J.M.Oxygen isotope variations of basaltic lavas and upper mantle rocksReviews in Mineralogy and Geochemistry, Vol. 43, pp. 319-64.MantleGeochemistry, Geochronology
DS2003-0025
2003
Eiler, J.M.Appora, I., Eiler, J.M., Matthews, A., Stolper, E.M.Experimental determination of oxygen isotope fractionation between CO2 vapor andGeochimica et Cosmochimica Acta, Vol. 67, 3, pp. 459-71.GlobalMelilite, Melting
DS2003-0718
2003
Eiler, J.M.King, R.L., Kohn, M.J., Eiler, J.M.Constraints on the petrologic structure of the subduction zone slab mantle interface fromGeological Society of America Bulletin, Vol. 115, 9, pp. 1097-1109.CaliforniaSubduction zone
DS200412-1006
2003
Eiler, J.M.King, R.L., Kohn, M.J., Eiler, J.M.Constraints on the petrologic structure of the subduction zone slab mantle interface from Franciscan Complex exotic ultramafic bGeological Society of America Bulletin, Vol. 115, 9, pp. 1097-1109.United States, CaliforniaSubduction zone
DS200512-0088
2005
Eiler, J.M.Bindeman, I.N., Eiler, J.M., Yogodzinski, Y., Stern, C.R., Grove, T.L., Portnyagin, Hoernle, DanyushevskyOxygen isotope evidence for slab melting in modern and ancient subduction zones.Earth and Planetary Science Letters, Vol. 235, 3-4, July 15, pp. 480-496.MantleSubduction
DS201412-0220
2014
Eiler, J.M.Eiler, J.M., Berquist, B., Bourg, I., Cartigny, P., Farquhar, J., Gagnon, A., Guo, W., Halevy, I., Hofman, A., larson, T.E., Levin, N., Schauble, E.A., Stolper, D.Frontiers of stable isotope geoscience.Chemical Geology, Vol. 372, pp. 119-143.TechnologyReview of isotopes
DS2003-0377
2003
Eilieff, S.Eilieff, S.Use of airborne graviometry for mineral explorationOntario Exploration and Geoscience Symposium, Dec. 8,9,10th., Abstracts p. 21.(1/8p.)OntarioGeophysics - gravity AIRGrav
DS200412-0512
2003
Eilieff, S.Eilieff, S.Use of airborne graviometry for mineral exploration.Ontario Exploration and Geoscience Symposium, Dec. 8,9,10th., Abstracts p. 21.(1/8p.)Canada, OntarioGeophysics - gravity AIRGrav
DS2002-0899
2002
Eilts, F.Krawczyk, C.M., Eilts, F., Lassen, A., Thybo, H.Seismic evidence of Caledonian deformed crust and uppermost mantle structures in the northern part of the Trans European Suture Zone, SW Baltic Sea.Tectonophysics, Vol. 360, 1-4, pp. 215-44.Europe, Baltic SeaTectonics
DS200612-1517
2005
Eilu, P.Weihed, P., Arndt, N., Billstrom, K., Duschesne, J-C., Eilu, P., Martinsson, O., Papunen, H., Lahtinen, R.Precambrian geodynamics and ore formation: the Fennoscandian shield.Ore Geology Reviews, Vol. 27, pp. 273-322.Europe, FennoscandiaMetallogeny - tectonics
DS200812-0952
2008
EIMFReutsky, V.N., Harte, B., EIMF, Borzdov, Y.M., Palyanov, Y.N.Monitoring diamond crystal growth, a combined experimental and SIMS study.European Journal of Mineralogy, Vol. 20, no. 3, pp. 365-374.TechnologyDiamond morphology
DS200912-0767
2009
EIMFTomlinson, E.L., Muller, W., EIMFA snapshot of mantle metasomatism: trace element analysis of coexisting fluid (LA ICP-MS) and silicate (SIMS) inclusions in fibrous diamonds.Earth and Planetary Science Letters, Vol. 279, 3-4, pp. 361-372.MantleGeochronology, metasomatism
DS201112-1042
2011
EIMFTichomirowa, M., EIMF, Whitehouse, M.Formation and transformation of zircon grains from the Archean carbonatite Siilinjarvi - evidence from cathodluminescence, rare earth elements and U/Pb geochrPeralk-Carb 2011, workshop held Tubingen Germany June 16-18, PosterEurope, FinlandCarbonatite
DS201212-0340
2012
EIMFJohnson, C.N., Stachel, T., Muehlenbachs, K., Stern, R.A., Armstrong, J.P., EIMFThe micro/macro diamond relationship: a case study from the Artemisia kimberlite ( northern Slave Craton), Canada.Lithos, Vol. 148, pp. 86-97.Canada, Northwest TerritoriesDeposit - Artemisia
DS201709-2058
2017
EIMFStachel, T., Harris, J.W., Hunt, L., Muehlenbachs, K., Kobussen, A., EIMFArgyle diamonds - how subduction along the Kimberley Craton edge generated the World's biggest diamond deposit.Economic Geology, 50p. By permission of authorAustraliadeposit - Argyle

Abstract: Based on the mineral inclusion content, diamonds from the Argyle Mine, Western Australia, derive primarily (~90%) from eclogitic sources with a minor peridotitic contribution from both harzburgitic and lherzolitic lithologies. The eclogitic inclusions cover a large compositional range and show in part unusually high concentrations of mantle incompatible elements (P, Ti, Na and K). Coherent trends in major elements (e.g., of Ti or Na versus Mg-number) suggest that the eclogitic diamond source was created by a single process, namely igneous fractionation. Calculated bulk rock REEN patterns match a section of oceanic crust reaching from lavas and sheeted dykes to upper gabbros. Positive Eu anomalies for garnet and clinopyroxene, with calculated bulk rock REEN patterns similar to upper (non-layered) gabbros, are strong evidence for plagioclase accumulation, which is characteristic for the gabbroic portions of oceanic crust. Linking previously published oxygen isotope analyses of eclogitic garnet inclusions with their major element composition reveals a correlation between d18O (mean of +7.2‰) and Na content, consistent with coupled 18O and Na enrichment during low temperature alteration of oceanic crust. The carbon isotopic composition of Argyle eclogitic diamonds forms a normal distribution around a d13C value of -11‰, indicative of mixing and homogenization of mantle and crustal (organic matter) derived carbon prior to diamond precipitation. Previously published noble gas data on Argyle diamonds support this two component model. Inclusion and nitrogen-in-diamond based thermometry indicate an unusually hot origin of the eclogitic diamond suite, indicative of derivation from the lowermost 25 km (about 180-205 km depth) of the local lithospheric mantle. This is consistent with emplacement of an oceanic protolith during subduction along the Kimberley Craton margin, likely during the Halls Creek Orogeny (about 1.85 Ga). For Argyle eclogitic diamonds the relationship between the rate of platelet degradation and mantle residence temperature indicates that both temperature and strain play an important role in this process. Therefore, ubiquitous platelet degradation and plastic deformation of Argyle diamonds are consistent with derivation from a high temperature environment (softening the diamond lattice) close to the lithosphere-asthenosphere boundary (inducing strain). In combination, the Argyle data set represents a uniquely strong case for a subduction origin of an eclogitic diamond source followed by mixing of mantle and crustal components during diamond formation. Some lherzolitic inclusions show a similarity in incompatible element enrichments (elevated P, Na and K) to the eclogitic suite. The presence of a mildly majoritic lherzolitic garnet further supports a link to eclogitic diamond formation, as very similar majoritic components were found in two eclogitic garnet inclusions. The carbon isotopic composition of peridotitic diamonds shows a mode between -5 to -4 ‰ and a tail extending towards the eclogitic mode (-11 ‰). This suggests the presence of multiple generations of peridotitic diamonds, with indications for an origin linked to the eclogitic suite being restricted to diamonds of lherzolitic paragenesis. Argyle diamonds – how subduction along the Kimberley Craton edge generated the world's biggest diamond deposit.
DS201901-0069
2017
EIMFReutsky, V.N., Kowalski, P.M., Palyanov, Y.N., EIMF, Weidenbeck, M.Experimental and theoretical evidence for surface induced carbon and nitrogen fractionation during diamond crystallization at high temperatures and high pressures.Crystals MDPI, Vol. 7, 7, 14p. Doi.org/ 10.3390/cryst7070190Russiadiamond morphology

Abstract: Isotopic and trace element variations within single diamond crystals are widely known from both natural stones and synthetic crystals. A number of processes can produce variations in carbon isotope composition and nitrogen abundance in the course of diamond crystallization. Here, we present evidence of carbon and nitrogen fractionation related to the growing surfaces of a diamond. We document that difference in the carbon isotope composition between cubic and octahedral growth sectors is solvent-dependent and varies from 0.7‰ in a carbonate system to 0.4‰ in a metal-carbon system. Ab initio calculations suggest up to 4‰ instantaneous 13C depletion of cubic faces in comparison to octahedral faces when grown simultaneously. Cubic growth sectors always have lower nitrogen abundance in comparison to octahedral sectors within synthetic diamond crystals in both carbonate and metal-carbon systems. The stability of any particular growth faces of a diamond crystal depends upon the degree of carbon association in the solution. Octahedron is the dominant form in a high-associated solution while the cube is the dominant form in a low-associated solution. Fine-scale data from natural crystals potentially can provide information on the form of carbon, which was present in the growth media.
DS1992-0415
1992
Ein, D.A.Ein, D.A.Sunsets and diamonds. A trip to Cape MayLapidary Journal, May pp. 41-46GlobalQuartz diamonds, Layman -Mineral collecting
DS2000-0235
2000
EinaudiDilles, J.H., Barton, Johnson, Profet, EinaudiContrasting styles of intrusion associated hydrothermal systemsSociety of Economic Geologists Guidebook, Vol. 32, 160p.NevadaBook - table of contents, Deposit - Tin Creeks, Getchell, Pinson
DS201511-1847
2015
Einbeck, J.Julian, B.R., Foulger, G.R., Hatfield, O., Jackson, S.E., Simpson, E., Einbeck, J., Moore, A.Hotspots in hindsight. Mentions kimberlitesGeological Society of America Special Paper, No. 514, pp. SPE514-08.MantleHotspots

Abstract: Thorne et al. (2004), Torsvik et al. (2010; 2006) and Burke et al. (2008) have suggested that the locations of melting anomalies ("hot spots") and the original locations of large igneous provinces ("LIPs") and kimberlite pipes, lie preferentially above the margins of two "large lower-mantle shear velocity provinces", or LLSVPs, near the bottom of the mantle, and that the geographical correlations have high confidence levels (> 99.9999%) (Burke et al., 2008, Fig. 5). They conclude that the LLSVP margins are "Plume-Generation Zones", and that deep-mantle plumes cause hot spots, LIPs, and kimberlites. This conclusion raises questions about what physical processes could be responsible, because, for example, the LLSVPs are apparently dense and not abnormally hot (Trampert et al., 2004). The supposed LIP-hot spot-LLSVP correlations probably are examples of the "Hindsight Heresy" (Acton, 1959), of performing a statistical test using the same data sample that led to the initial formulation of a hypothesis. In this process, an analyst will consider and reject many competing hypotheses, but will not adjust statistical assessments correspondingly. Furthermore, an analyst will test extreme deviations of the data, , but not take this fact into account. "Hindsight heresy" errors are particularly problematical in Earth science, where it often is impossible to conduct controlled experiments. For random locations on the globe, the number of points within a specified distance of a given curve follows a cumulative binomial distribution. We use this fact to test the statistical significance of the observed hot spot-LLSVP correlation using several hot-spot catalogs and mantle models. The results indicate that the actual confidence levels of the correlations are two or three orders of magnitude smaller than claimed. The tests also show that hot spots correlate well with presumably shallowly rooted features such as spreading plate boundaries. Nevertheless, the correlations are significant at confidence levels in excess of 99%. But this is confidence that the null hypothesis of random coincidence is wrong. It is not confidence about what hypothesis is correct. The correlations probably are symptoms of as-yet-unidentified processes.
DS1991-0433
1991
Einsele, G.Einsele, G.Sedimentary basins: evolution, facies and sediment budgetSpringer-Verlag, 550p. approx. $ 60.00 United StatesGlobalBasin model, Book-ad
DS1992-0416
1992
Einsele, G.Einsele, G., Ricken, W., Seilacher, A.Cycles and events in stratigraphySpringer-Verlag, 1040pGlobalStratigraphy, Ad -outline
DS202001-0044
2019
Einsle, J.F.Tang, F., Taylor, R.J.M., Einsle, J.F., Borlina, C.S., Fu, R.R., Weiss, B.P., Williams, H.M., Williams, W., Nagy, L., Midgley, P.A., Lima, E.A., Bell, E.A., Harrison, T.M., Alexander, E.W., Harrison, R.J.Secondary magnetite in ancient zircon precludes analysis of a Hadean geodynamo. Jack HillsProceedings National Academy of Science, Vol. 116, pp. 407-412.Australiapaleomagnetism

Abstract: Zircon crystals from the Jack Hills, Western Australia, are one of the few surviving mineralogical records of Earth’s first 500 million years and have been proposed to contain a paleomagnetic record of the Hadean geodynamo. A prerequisite for the preservation of Hadean magnetization is the presence of primary magnetic inclusions within pristine igneous zircon. To date no images of the magnetic recorders within ancient zircon have been presented. Here we use high-resolution transmission electron microscopy to demonstrate that all observed inclusions are secondary features formed via two distinct mechanisms. Magnetite is produced via a pipe-diffusion mechanism whereby iron diffuses into radiation-damaged zircon along the cores of dislocations and is precipitated inside nanopores and also during low-temperature recrystallization of radiation-damaged zircon in the presence of an aqueous fluid. Although these magnetites can be recognized as secondary using transmission electron microscopy, they otherwise occur in regions that are indistinguishable from pristine igneous zircon and carry remanent magnetization that postdates the crystallization age by at least several hundred million years. Without microscopic evidence ruling out secondary magnetite, the paleomagnetic case for a Hadean-Eoarchean geodynamo cannot yet been made.
DS1990-1425
1990
Eisbacher, G.H.Strecker, M.R., Blisniuk, P.M., Eisbacher, G.H.Rotation of extension direction in the central Kenya rift (Lat 120 s to 020 n)Geology, Vol. 18, No. 4, April pp. 299-302KenyaTectonics, Rifting
DS1983-0214
1983
Eisenburger, D.Eisenburger, D., Hannak, W., Haut, R., Knabe, W., Levin, P., MullCircular Magnetic Structures in Upper Volta and Their Geological Significance for Prospecting.Journal of AFRICAN EARTH SCI., Vol. 1, No. 3-4, P. 358. (abstract.).West Africa, Upper VoltaGeotectonics
DS1984-0348
1984
Eisenburger, D.Haut, F.R., Levin, P., Eisenburger, D.Diamantfuehrende Ultrabasite in ObervoltaGeol. Jahrb., Upper Volta, West AfricaKimberlite, Geophysics, Geology, Diamonds
DS1996-0330
1996
Eisenhour, D.D.Daulton, T.L., Eisenhour, D.D., Buseck, P.R.Genesis of presolar diamonds; comparative high-resolution transmission electron microscopy studyGeochimica et Cosmochimica Acta, Vol. 60, No. 23, Dec. 1, pp. 4853-72.GlobalMicroscopy, Meteorites, Nano-diamonds
DS1998-0805
1998
Eisenlohr, B.Krapez, B., Eisenlohr, B.Tectonic settings of Archean ( 3325-2775 Ma) crustal supracrustal belts inwest Pilbara BlockPrec. Research, Vol. 88, No. 1-4, Mar. pp. 173-207AustraliaPilbara Craton, Tectonics
DS2000-0373
2000
Eissen, J-P.Gutscher, M-A., Maury, R., Eissen, J-P., Bourdon, E.Can slab melting be caused by flat subduction?Geology, Vol. 28, No. 6, June pp. 535-8.Chile, Ecuador, Costa RicaThermometry - thermal structure, Adakites
DS1989-0980
1989
Ejeckam, R.B.McCrank, G.F.D., Kamineni, D.C., Ejeckam, R.B., Sikorsky, R.Geology of the East Bulletin Lake gabbro- anorthosite pluton, Algoma OntarioCanadian Journal of Earth Sciences, Vol. 26, No. 2, February pp. 357-375OntarioAnorthosite
DS201512-1935
2015
Ejima, T.Kon, Y., Araoka, D., Ejima, T., Hirata, T.Rapid and precise determination of major and trace elements in CCRMP and USGS geochemical reference samples using femtosecond laser ablation ICP-MS.Symposium on critical and strategic materials, British Columbia Geological Survey Paper 2015-3, held Nov. 13-14, pp. 245-250.TechnologyCarbonatite

Abstract: We measured 10 major (SiO2, TiO2, Al2O3, total Fe2O3, MnO, MgO, CaO, Na2O, K2O, and P2O5) and 32 trace (Sc, V, Cr, Co, Ni, Cu, Zn, Rb, Sr, Y, Zr, Nb, Cs, Ba, La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, Hf, Pb, Th, and U) elements in 16 geochemical reference samples (AGV-1, AGV-2, BCR-1, BCR- 2, BHVO-2, BIR-1a, DNC-1a, G-2, GSP-1, GSP-2, MAG-1, QLO-1, RGM-1, RGM-2, SGR-1b, and STM-1) distributed by United States Geological Survey (USGS) and three reference rock samples (SY-2, SY-3, and MRG-1) provided by Canadian Certifi ed Reference Materials Project (CCRMP) using inductively coupled plasma -mass spectrometry coupled with the femtosecond laser ablation sample introduction technique (fsLA-ICP-MS). Before the elemental analysis, fused glassbeads were prepared from the mixture of sample powder and high-purity alkali fl ux with a mixing ratio of 1:10. The abundances of the major and trace elements were externally calibrated by using glass beads containing the major and trace elements prepared from 17 Geological Survey of Japan (GSJ) geochemical reference samples (JB-1, JB-1a, JB-2, JB-3, JA-1, JA-2, JA-3, JR-1, JR-2, JR-3, JP-1, JGb-1, JGb-2, JG-1a, JG- 2, JG-3, and JSy-1). Typical analysis repeatabilities for these geochemical reference samples were better than 3% for Al2O3 and Na2O; <5% for SiO2, TiO2, total Fe2O3, MnO, MgO, CaO, K2O, P2O5, Zn, Rb, Sr, Zr, Nb, Ba, Nd, and U; <8% for Sc, V, Cr, Co, Y, Cs, La, Ce, Pr, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, Hf, Pb, and Th; <11% for Ni and Cu. These data clearly demonstrate that high analytical repeatability can be achieved by the fsLA-ICP-MS technique with glass beads made from 0.5 g larger samples.
DS1985-0311
1985
Ekambaram, V.Jones, A.P., Ekambaram, V.New Ina a Analysis of a Mantle Derived Titanate Mineral of The Crichtonite Series, with Particular Reference to the Rareearth Elements.American Mineralogist., Vol. 70, PP. 414-418.South AfricaBultfontein, Rare Earth Elements (ree), Mineral Chemistry
DS1999-0420
1999
Ekanayake, S.Long, D., Sawatsky, L., Ekanayake, S.Potential oversights and common errors in analyzing northern hydrology: acommended approach ....Mining in the Arctic, Udd and Keen editors, Balkema, pp. 85-89.Northwest TerritoriesMining - hydrology, Deposit - Diavik
DS1989-0315
1989
Ekart, D.Cullers, R.L., Berendsen, P., Stone, J., Ekart, D.The composition and petrogenesis of newly discovered lamproites in WoodsonCounty, KansasGeological Society of America (GSA) Annual Meeting Abstracts, Vol. 21, No. 6, p. A201. AbstractKansasLamproites, Petrology
DS200712-0289
2007
Ekasit, S.Ekasit, S., Thongnopkun, P.Transflectance spectra of faceted diamonds acquired by infrared microscopy.Applied Spectroscopy, Vol. 59, 9, pp. 1160-1165.TechnologyDiamond morphology
DS1995-0505
1995
Ekhov, V.A.Erinchek, Y.M., Ekhov, V.A., Parasotka, V.S.Prospecting for primary diamond deposits by geophysical methodsMineral Resources of Russia, abstract, Oct. 1994, pp. 24-31.Russia, YakutiaProspecting, Geophysics
DS200712-0290
2006
Ekimov, E.Ekimov, E., Sidorov, V., Rakhmaninia, A., Melnik, N., Timofeev, M., Sadykov, R.Synthesis, structure and physical properties of boron doped diamond.Inorganic Materials, Vol. 42, 11, Nov. pp. 1198-1204.TechnologyDiamond mineralogy
DS200412-0513
2004
Ekimov, E.A.Ekimov, E.A., Sidorov, V.A., Bauer, E.D., Melnik, N.N., Curro, N.J., Thompson,J.D., Stishov, S.M.Superconductivity in diamond.Nature, No. 6982,April 1, pp. 542-44.TechnologyDiamond - morphology
DS200412-0514
2004
Ekimov, E.A.Ekimov, E.A., Sidorov, V.A., Melnik, N.N., Gierlotka, S., Presz, A.Synthesis of polycrystalline diamond in the boron carbide graphite and boron graphite systems under high pressure and temperaturJournal of Materials Research, Vol. 39, 15, pp. 4957-4960.TechnologyDiamond synthesis
DS201811-2569
2018
Ekimov, E.A.Ekimov, E.A., Sidorov, V.A., Maslakov, K.I., Sirotinkin, B.P., Krotova, M.D., Pleskov, Yu.V.Influence of growth medium composition on the incorporation of boron in HPHT diamond.Diamond & Related Materials, Vol. 89, pp. 101-107.Mantleboron

Abstract: Influence of growth medium composition on the efficiency of boron doping of carbonado-like diamond at 8-9 GPa was studied by diluting the C-B growth system with metallic solvents of carbon, Co and Ni. Addition of these metals to the original system leads to a decrease in the synthesis temperature, degree of doping with boron and suppression of superconductivity in diamond. According to XPS analysis, content of substitutional boron is equal to 0.07, 0.16 and 0.39 at.% in diamonds obtained in Co-C-B, Ni-C-B and C-B growth systems, respectively. Metallic behavior at normal temperatures and superconductivity below 5 K in diamond, synthesized in C-B system, change to semiconducting character of conductivity down to 2 K in diamonds obtained in the diluted systems; a faint hint of superconducting transition at 2 K was detected in the case of diamond grown in Ni-C-B system. By comparing phase composition of the inclusions and the doping efficiency of the diamonds, we are able to suggest that high chemical affinity of boron to boride-forming metals hinders the boron doping of diamond. The heavily boron-doped carbonado-like diamond compacts demonstrate high electrochemical activity in aqueous solutions and can be used as miniature electrodes in electrosynthesis and electroanalysis.
DS201812-2805
2018
Ekimov, E.A.Ekimov, E.A., Sidorov, V.A., Maslakov, K.I., Sirotinkin, B.P., Krotova, M.D., Pleskov, Yu.V.Influence of growth medium composition on the incorporation of boron in HPHT diamond.Diamond & Related Materials, Vol. 89, pp. 101-107.Mantlecarbonado
DS201905-1027
2019
Ekimov, E.A.Ekimov, E.A., Kondrin, M.V., Krivobok, V.S., Khomich, A.A., Vlasov, I.I., Khmelnitskiy, R.A.Effect of Si, Ge and Sn dopant elements on structure and photoluminescence of nano- and microdiamonds synthesized from organic compounds.Diamond & Related Materials, Vol. 93, pp. 75-83.Globalluminescence

Abstract: HPHT synthesis of diamonds from hydrocarbons attracts great attention due to the opportunity to obtain luminescent nano- and microcrystals of high structure perfection. Systematic investigation of diamond synthesized from the mixture of hetero-hydrocarbons containing dopant elements Si or Ge (C24H20Si and C24H20Ge) with a pure hydrocarbon - adamantane (C10H16) at 8?GPa was performed. The photoluminescence of SiV- and GeV- centers in produced diamonds was found to be saturated when Si and Ge contents in precursors exceed some threshold values. The presence of SiC or Ge as second phases in diamond samples with saturated luminescence indicates that ultimate concentrations of the dopants were reached in diamond. It is shown that SiC inclusions can be captured by growing crystals and be a source of local stresses up to 2?GPa in diamond matrix. No formation of Ge-related inclusions in diamonds was detected, which makes Ge more promising as a dopant in the synthesis method. Surprisingly, the synthesis of diamonds from the C24H20Sn hetero-hydrocarbon was ineffective for SnV- formation: only fluorescence of N-and Si-related color centers was detected at room temperature. As an example of great potential for the synthesis method, mass synthesis of 50-nm diamonds with GeV- centers was realized at 9.4?GPa. Single GeV- production in individual nanodiamond was demonstrated.
DS1995-1066
1995
EkimovaLavrova, L.D., Petchnikov, V.A., Petrova, M.A., EkimovaNew genetic type of diamond deposits: geological pecularities and originProceedings of the Sixth International Kimberlite Conference Abstracts, pp. 311-313.Russia, KazakhstanMetamorphic, Deposit -Kumdykolskoye
DS201811-2553
2018
Ekimova, N.I.Badredinov, Z.G., Markovsky, B.A., Tararin, I.A., Ekimova, N.I., Chubarov, V.M.Fluid silicate seperation of an ultrabasic melt into high potassium and low potassium fractions: evidence from picrites of the Late Cretaceous ultrabasic volcanic complex, eastern Kamchatka.Russian Journal of Pacific Geology, Vol. 12, 5, pp. 408-418.Russia, Kamchatkapicrites

Abstract: The mineral and chemical compositions of the layered subvolcanic ultrabasic rocks formed through fluid-silicate (liquid) separation of the ultrabasic magma into high-potassium and low-potassium fractions are characterized by the example of the layered picritic sill from the Late Cretaceous ultrabasic volcanic complex of Eastern Kamchatka. It is determined that the main potassium concentrator in the picrites from the high-potassium layers is a residual volcanic glass containing up to 8-9 wt % K2O, which is unique for ultrabasic melts.
DS1987-0439
1987
Ekimova, T.E.Martovitskii, V.P., Nadezhdina, E.D., Ekimova, T.E.Internal structure and morphology of small nonkimberliticdiamonds.(Russian)Mineral Zhurn., (Russian), Vol. 9, No. 2, pp. 26-37GlobalBlank
DS1994-0489
1994
Ekimova, T.E.Ekimova, T.E., Lavrova, L.D., Nadezhdina, E.D., Petrova, M.Conditions of the formation of the Kumdykol diamond deposit, NorthernKazakhstan.Geology of Ore Deposits, Vol. 36, No. 5, pp. 410-419.Russia, KazakhstanDiamond genesis, Deposit -Kumdykol
DS1995-1065
1995
Ekimova, T.E.Lavrova, L.D., Pechniko, V.A., Petrova, M.A., Ekimova, T.E.Minerals - indicators of diamond in the metamorphic rocks. (Russian)Doklady Academy of Sciences Nauk, (Russian), Vol. 343, No. 2, July pp. 220-224.Russiametamorphism
DS1995-1467
1995
Ekimova, T.E.Pechnikov, V.A., Ekimova, T.E.The origin of microdiamond deposits in metamorphic complexesSga Third Biennial Meeting, Aug. 1995, pp. 621-624.RussiaKotchetkav Massif, Metamorphic complexes
DS2003-0378
2003
Ekkerd, J.Ekkerd, J., Stiefenhofer, J., Field, M.The geology of the Finsch mine, northern Cape Province, South Africa8ikc, Www.venuewest.com/8ikc/program.htm, Session 1 POSTER abstractSouth AfricaKimberlite geology and economics, Deposit - Finsch
DS200512-1193
2005
Ekkerd, J.Wolmarans, A., Cloete, J.H., Ekkerd, J., Mason, I.M., Simmat, C.M.Borehole radar application to kimberlite delineation at Finsch diamond mine.Exploration Geophysics, Vol. 36, 3, pp. 310-317.Africa, South AfricaFinsch mine
DS200612-0369
2006
Ekkerd, J.Ekkerd, J., Stiefenhofer, J., Field, M., Lawless, P.The geology of Finsch mine, northern Cape Province, South Africa.Emplacement Workshop held September, 5p. extended abstractAfrica, South AfricaDeposit - Finsch geology
DS201612-2280
2016
Ekkerd, J.Basson, I.J., Creus, P.K., Anthonissen, C.J., Stoch, B., Ekkerd, J.Structural analysis and implicit 3D modelling of high grade host rocks to the Venetia kimberlite diatremes, central zone, Limpopo belt, South Africa.Journal of Structural Geology, Vol. 86, pp. 47-61.Africa, South AfricaDeposit - Venetia

Abstract: The Beit Bridge Complex of the Central Zone (CZ) of the Limpopo Belt hosts the 519 ± 6 Ma Venetia kimberlite diatremes. Deformed shelf- or platform-type supracrustal sequences include the Mount Dowe, Malala Drift and Gumbu Groups, comprising quartzofeldspathic units, biotite-bearing gneiss, quartzite, metapelite, metacalcsilicate and ortho- and para-amphibolite. Previous studies define tectonometamorphic events at 3.3-3.1 Ga, 2.7-2.5 Ga and 2.04 Ga. Detailed structural mapping over 10 years highlights four deformation events at Venetia. Rules-based implicit 3D modelling in Leapfrog Geo provides an unprecedented insight into CZ ductile deformation and sheath folding. D1 juxtaposed gneisses against metasediments. D2 produced a pervasive axial planar foliation (S2) to isoclinal F2 folds. Sheared lithological contacts and S2 were refolded into regional, open, predominantly southward-verging, E-W trending F3 folds. Intrusion of a hornblendite protolith occurred at high angles to incipient S2. Constrictional-prolate D4 shows moderately NE-plunging azimuths defined by elongated hornblendite lenses, andalusite crystals in metapelite, crenulations in fuchsitic quartzite and sheath folding. D4 overlaps with a: 1) 2.03-2.01 Ga regional M3 metamorphic overprint; b) transpressional deformation at 2.2-1.9 Ga and c) 2.03 Ga transpressional, dextral shearing and thrusting around the CZ and d) formation of the Avoca, Bellavue and Baklykraal sheath folds and parallel lineations.
DS201709-1959
2016
Ekkerd, J.Basson, I.J., Creus, P.K., Anthonissen, C.J., Stoch, B., Ekkerd, J.Structural analysis and implicit 3D modelling of high grade host rocks to the Venetia kimberlite diatremes, central Zone, Limpopo belt, South AfricaJournal of Structural Geology, Vol. 86, pp. 47-61.Africa, South Africadeposit - Venetia

Abstract: The Beit Bridge Complex of the Central Zone (CZ) of the Limpopo Belt hosts the 519 ± 6 Ma Venetia kimberlite diatremes. Deformed shelf- or platform-type supracrustal sequences include the Mount Dowe, Malala Drift and Gumbu Groups, comprising quartzofeldspathic units, biotite-bearing gneiss, quartzite, metapelite, metacalcsilicate and ortho- and para-amphibolite. Previous studies define tectonometamorphic events at 3.3-3.1 Ga, 2.7-2.5 Ga and 2.04 Ga. Detailed structural mapping over 10 years highlights four deformation events at Venetia. Rules-based implicit 3D modelling in Leapfrog Geo™ provides an unprecedented insight into CZ ductile deformation and sheath folding. D1 juxtaposed gneisses against metasediments. D2 produced a pervasive axial planar foliation (S2) to isoclinal F2 folds. Sheared lithological contacts and S2 were refolded into regional, open, predominantly southward-verging, E-W trending F3 folds. Intrusion of a hornblendite protolith occurred at high angles to incipient S2. Constrictional-prolate D4 shows moderately NE-plunging azimuths defined by elongated hornblendite lenses, andalusite crystals in metapelite, crenulations in fuchsitic quartzite and sheath folding. D4 overlaps with a: 1) 2.03-2.01 Ga regional M3 metamorphic overprint; b) transpressional deformation at 2.2-1.9 Ga and c) 2.03 Ga transpressional, dextral shearing and thrusting around the CZ and d) formation of the Avoca, Bellavue and Baklykraal sheath folds and parallel lineations.
DS1998-0387
1998
Eklund, O.Eklund, O., Konopelko, D., Shebanov, A.D.1.8 Ga Sevcofennian post-collisional shoshonitic magmatism in the Fennoscandian shield.Lithos, Vol. 45, Dec. pp. 87-108.Finland, Norway, Sweden, ScandinaviaGeochronology, Magmatism
DS2003-0738
2003
Eklund, O.Konopelko, D., Eklund, O.Timing and geochemistry of potassic magmatism in the eastern part of the SvecofennianPrecambrian Research, Vol. 120, 1-2, pp.37-53.Russia, KareliaGeochronology
DS200412-1031
2003
Eklund, O.Konopelko, D., Eklund, O.Timing and geochemistry of potassic magmatism in the eastern part of the Svecofennian domain , NW Ladoga Lake region, Russiam KaPrecambrian Research, Vol. 120, 1-2, pp.37-53.Russia, KareliaGeochronology
DS200512-0258
2005
Eklund, O.Eklund, O., Shebanov, A.Prolonged Post collisional shoshonitic magmatism in the southern Svecofennian domain - a case study of the Ava granite lamprophyre ring complex.Lithos, Vol. 80, 1-4, March pp. 229-247.Europe, FinlandRing dykes, geothermometry
DS200612-0023
2006
Eklund, O.Anderson, U.B., Eklund, O., Frjd, S., Konopelko, D.1.8 Ga magmatism in the Fennoscandian Shield; lateral variations in subcontinental mantle enrichment.Lithos, Vol. 86, 1-2, pp. 110-136.Europe, Finland, Sweden, Kola PeninsulaMagmatism
DS200712-1176
2007
Eklund, O.Woodward, J., Eklund, O.Storage of crustal forming events in lamprophyres: examples from the Fennoscandian Shield.Plates, Plumes, and Paradigms, 1p. abstract p. A1127.Europe, Fennoscandia, Finland, Kola PeninsulaLamprophyre
DS200812-0315
2008
Eklund, O.Eklund, O.Generation, transportation and emplacement of post and anorogenic magmas in the Fennoscandian Shield.Geotectonic Research, Vol. 95, suppl. 1 pp. 41-42.Europe, Finland, NorwayMagmatism
DS200812-0567
2008
Eklund, O.Kietavainen, R., Woodard, J., Eklund, O., Hetherington, C.J., BoettcherApatite as a petrogenetic indicator for lamprophyres and carbonatites.Goldschmidt Conference 2008, Abstract p.A469.Europe, FennoscandiaChemistry - trace elements
DS201012-0360
2010
Eklund, O.Kietavainen, R., Woodard, J., Eklund, O., Boettcher, I.Apatite composition in post-collisional lamprophyres and carbonatites in the Fennoscandinavian Shield: insight into their petrogenesis.International Dyke Conference Held Feb. 6, India, 1p. AbstractEurope, FinlandCarbonatite
DS201412-0992
2014
Eklund, O.Woodard, J., Kietavainen, R., Eklund, O.Svecofennian post-collisional shoshonitic lamprophyres at the margin of the Karelia Craton: implications for mantle metasomatism.Lithos, Vol. 205, pp. 379-393.Europe, FinlandShoshonite
DS1990-0199
1990
Eklund, P.C.Bi, Xiang Xin, Eklund, P.C., et al.Optical properties of chemical vapour deposited diamond filmsJournal of Material Research, Vol. 5, No. 4, pp. 811-817GlobalDiamond synthesis, CVD.
DS1960-0946
1968
Ekman, A.Ekman, A., Parker, I.H., Storms, W.H., Penniman, H.W., DittmarOld Mines and Ghost Camps of CaliforniaFrontier Book Co. Fort Davis Texas, P. 26; P. 67.United States, California, West CoastBlank
DS201212-0534
2012
Ekodeck, G.E.Owona, S., Tichomirowa, M., Ratschbacher, L., Ondoa, J.M., Youmen, D., Pfander, J., Tchoua, F.M., Affaton, P., Ekodeck, G.E.New igneous zircon Pb/Pb and metamorphic Rb/Sr ages in the Yaounde Group, Cameroon, Central Africa): implications for the Central African fold belt evolution close to the Congo Craton.International Journal of Earth Sciences, Vol. 101, 7, pp. 1689-1703.Africa, CameroonGeochronology
DS201212-0535
2012
Ekodeck, G.E.Owona, S., Tichomirowa, M., Ratschbacher, L., Ondoa, W.J., Youmen, D., Pfander, J., Tchoua, F.M., Affaton, P., Ekodeck, G.E.New igneous zircon Pb/Pb and metamorphic Rb/Sr ages in the Yaounde Group ( Cameron, Central Africa): implications for the Central African fold belt evolution close to the Congo Craton.International Journal of Earth Sciences, Vol. 101, pp. 1689-1703.Africa, CameroonGeochronology
DS201705-0832
2017
Ekodeck, G.E.Goussi Ngalamo, J.F., Bisso, D., Abdelsalam, M.G., Atekwana, E.A., Katumwehe, A.B., Ekodeck, G.E.Geophysical imaging of metacratonization in the northern edge of the Congo craton in Cameroon.Journal of African Earth Sciences, Vol. 129, pp. 94-107.Africa, CameroonCraton, Congo

Abstract: We used the World Gravity Map (WGM 2012) data to investigate the Archean Congo craton and the Oubanguides orogenic belt in Cameroon. The Oubanguides orogenic belt constitutes, from northwest to southeast, the Neoproterozoic West Cameroon domain, the Paleoproterozoic-Neoproterozoic Adamawa-Yade domain, and the dominantly Neoproterozoic Yaoundé domain (the crustal expression of the suture zone between the Congo craton and the orogenic terranes). We analyzed the WGM 2012 data to identify different gravity anomalies. We also applied the two-dimensional (2D) radially-averaged power spectral analysis to the WGM 2012 data to estimate the Moho depth. Additionally, we developed a 2D forward gravity model along a Nsbnd S profile to image the lithospheric structure of the Precambrian entities. We found that: (1) the Congo craton, the Yaoundé domain, the southeastern part of the West Cameroon domain, and the northern part of the Adamawa-Yade domain are characterized by low gravity anomaly. (2) the southern part of the Adamawa-Yade domain is marked by a pronounced E-W trending high gravity anomaly. (3) the crust is thicker beneath the Congo craton, the Yaoundé domain and the southern part of the Adamawa-Yade domain. (4) the presence of a denser lower crust material beneath the southern part of the Adamawa-Yade domain. We propose that this denser crustal material is an under-thrusted portion of the Congo craton that has been densified through metacratonization processes that accompanied collision between the craton and the orogenic terranes. This is in good agreement with geological and geochemical observations indicating that the northern edge of the Congo craton and the Adamawa-Yade domain had undergone metacratonization during the Neoproterozoic. Our suggestion is also in good agreement with observations which show that the margins of many cratons worldwide have been decratonized due to subduction processes. Our work highlights the importance of potential field geophysical data in mapping the metacratonized margins of cratons.
DS201811-2595
2018
Ekodeck, G.E.Ngalamo, J.F.G., Sobh, M., Bisso, D., Abdelsalam, M.G., Atekwana, E., Ekodeck, G.E.Lithospheric structure beneath the Central Africa Orogenic Belt in Cameroon from the analysis of satellite gravity and passive seismic data.Tectonophysics, Vol. 745, pp. 326-337.Africa, Cameroongeophysics - seismic

Abstract: We present original results that contribute to the understanding of lithospheric structures modification of regions that have witnessed superimposition of multiple tectonic events throughout their geological history. We analyze satellite gravity data through two-dimensional radially-averaged power spectral analysis as well as passive seismic data through thermal modeling to image the depth to the Moho and the lithosphere - asthenosphere boundary (LAB beneath the Central Africa Orogenic Belt (CAOB). The CAOB is an ENE-trending deformation belt extending from Cameroon in the west to Sudan in the east. In Cameroon, it is found on the northern edge of the Congo craton represented by the Oubanguides orogenic belt (the Western Cameroon, the Adamawa - Yade, and the Yaoundé domains). It coincides with the Adamawa plateau and the Benue Trough, and it is spotted by the Cenozoic Cameroon Volcanic Line (CVL). The CAOB was formed during the Precambrian Greater Gondwana assembly but was reactivated during the Mesozoic as a result of Gondwana breakup. We find deeper Moho and LAB) beneath Congo craton and the Yaoundé domain reaching ~50?km and ~200?km, respectively. We map shallower Moho and LAB beneath the CAOB (together with the Adamawa plateau and the Benue trough) reaching ~25?km and ~70?km, respectively. We interpret the shallower LAB beneath the CAOB as due to zonal sub-continental lithospheric mantle (SCLM) delamination along the northern edge of the Congo craton that occurred in association with collisional assembly of Greater Gondwana. This allowed for channelization of mantle flow during the Cenozoic resulting in the formation of the CVL and the uplift of the Adamawa plateau. Our approach can be used to understand the modification of lithospheric structures beneath other terrains that have long tectonic history.
DS201812-2812
2018
Ekodeck, G.E.Goussi Ngalamo, J.F., Sobh, M., Bisso, D., Abdelsalam, M.G., Atekwana, E., Ekodeck, G.E.Lithospheric structure beneath the central Africa orogenic belt in Cameroon from the analysis of satellite gravity and passive seismic data.Tectonophysics, Vol. 745, pp. 326-337.Africa, Cameroongeophysics - seismics

Abstract: We present original results that contribute to the understanding of lithospheric structures modification of regions that have witnessed superimposition of multiple tectonic events throughout their geological history. We analyze satellite gravity data through two-dimensional radially-averaged power spectral analysis as well as passive seismic data through thermal modeling to image the depth to the Moho and the lithosphere - asthenosphere boundary (LAB beneath the Central Africa Orogenic Belt (CAOB). The CAOB is an ENE-trending deformation belt extending from Cameroon in the west to Sudan in the east. In Cameroon, it is found on the northern edge of the Congo craton represented by the Oubanguides orogenic belt (the Western Cameroon, the Adamawa - Yade, and the Yaoundé domains). It coincides with the Adamawa plateau and the Benue Trough, and it is spotted by the Cenozoic Cameroon Volcanic Line (CVL). The CAOB was formed during the Precambrian Greater Gondwana assembly but was reactivated during the Mesozoic as a result of Gondwana breakup. We find deeper Moho and LAB) beneath Congo craton and the Yaoundé domain reaching ~50?km and ~200?km, respectively. We map shallower Moho and LAB beneath the CAOB (together with the Adamawa plateau and the Benue trough) reaching ~25?km and ~70?km, respectively. We interpret the shallower LAB beneath the CAOB as due to zonal sub-continental lithospheric mantle (SCLM) delamination along the northern edge of the Congo craton that occurred in association with collisional assembly of Greater Gondwana. This allowed for channelization of mantle flow during the Cenozoic resulting in the formation of the CVL and the uplift of the Adamawa plateau. Our approach can be used to understand the modification of lithospheric structures beneath other terrains that have long tectonic history.
DS201603-0390
2016
Ekomane, E.Kanouo, N.S., Ekomane, E., Yongue, R.F., Njonfang, E., Zaw, K., Changian, M., Ghogomu, T.R., Lentz, D.R., Venkatesh, A.S.Trace elements in corundum, chrysoberyl, and zircon: application to mineral exploration and provenance study of the western Mamfe gem clastic deposits ( SW Cameroon, Central Africa).Journal of African Earth Sciences, Vol. 113, pp. 35-50.Africa, CameroonGeochemistry

Abstract: Trace element abundances in three indicator minerals (corundum, chrysoberyl, and zircon grains) from the western Mamfe gem placers, as determined by LA-ICP-MS analytical techniques, are shown to be sensitive to their crystallization conditions and source rock types. Corundum is dominantly composed of Al (standardized at 529,300 ppm), Fe (2496-12,899 ppm), and Ti (46-7070 ppm). Among element ratios, Fe/Mg (73-1107), Fe/Ti (0.5-245.0), Ti/Mg (1-175), and Ga/Mg (4-90) are generally higher whereas, Cr/Ga (<0.072) is low. The Fe (=12,899), Ga (=398), Mg (2-62), Cr (1.1-33.0), and V (3.0-93.0) contents (in ppm) mostly typify corundum grains formed in magmatic rocks, although some are metamorphic affiliated. A very higher Ti and significantly low Ga, Ta and Nb contents in some blue grains, suggest interesting concentrations of those high-tech metals in their source rocks. Chrysoberyl is dominantly composed of Al (standardized at 425,000 ppm) and Be (62701-64371 ppm). Iron (7605-9225 ppm), Sn (502-3394 ppm), and Ti (33-2251 ppm) contents are high, whereas Ga (333-608 ppm), Ta (<456.0 ppm), and Nb (<3.0 ppm) are significantly low. The high (Be and Sn) and significantly low Ga-Rb abundances, and Ta > Nb in the western Mamfe chrysoberyls show that they were crystallized in granitic pegmatites, with some of those source rocks being enriched in Ta and Sn. Zirconium oxide (ZrO2: standardized at 66.1 wt.%)) is the only major oxide in analysed coarse-grained zircons. Within the minor elementary suites: Hf (4576-12,565 ppm) and Y (48-2805 ppm) contents are significantly high. The trace element suites include: Th (7-1565 ppm), U (13-687 ppm), and ?REE (50-2161 ppm), whose values are significantly low. The (Yb/Sm)N, Ce/Ce*, and Eu/Eu* anomalies range from 1.0 to 227.0, 0 to 308, and 0.08 to 1.7 respectively. They are Hf-Y-HREE enriched and depleted zircons mainly crystallized in magmatic oxidized environments. They were mainly sorted from granitoids, syenites and kimberlites.
DS200712-0962
2007
Eksteen, J.J.Scott, G., Bradshaw, S.M., Eksteen, J.J.The effect of microwave pretreatment on the liberation of a copper carbonatite ore after milling.International Journal of Mineral Processing, In press, availableTechnologyCarbonatite
DS2001-0420
2001
Ekstrom, C.Gu, Y., Dziewonski, A.M., Ekstrom, C.Preferential detection of the Lehmann discontinuity beneath continentsGeophysical Research Letters., Vol. 28, No. 24, Dec. 15, pp. 4655-58.MantleGeophysics - seismics, Discontinuity, boundary
DS1995-0488
1995
Ekstrom, G.Ekstrom, G.Improved models of upper mantle and velocity structureEos, Vol. 76, No. 46, Nov. 7. p.F421. Abstract.MantleGeophysics -seismic, Veolocity structure
DS2002-0191
2002
Ekstrom, G.Boschi, L., Ekstrom, G.New images of the Earth's upper mantle from measurements of surface wave phase velocity anomalies.Journal of Geophysical Research, Vol. 107, 4, ESE-1 ( approx. 15 p.)MantleGeophysics - seismics
DS2003-0516
2003
Ekstrom, G.Gu, Y.J., Dziewonski, A.M., Ekstrom, G.Simultaneous inversion for mantle shear velocity and topography of transition zoneGeophysical Journal International, Vol. 154, 2, pp. 559-83.MantleGeophysics - seismics, Discontinuity
DS200412-0738
2004
Ekstrom, G.Gu, Yu.J., Dziewonski, A.M., Ekstrom, G.Simultaneous inversion for mantle shear velocity and topography of transition zone discontinuities.Geophysical Journal International, Vol. 154, 2, pp. 559-583.MantleGeophysics - seismics, boundary
DS200812-0095
2008
Ekstrom, G.Becker, T., Kustowski, B., Ekstrom, G.Radial seismic anisotropy as a constraint for upper mantle rheology.Earth and Planetary Science Letters, Vol. 267, 1-2, pp.213-227.MantleGeophysics - seismics
DS200812-0256
2008
Ekstrom, G.Dalton, C.A., Ekstrom, G., Dziewonski, A.M.The global attenuation structure of the upper mantle.Journal of Geophysical Research, Vol. 113, B09303.MantleGeodynamics
DS200812-0257
2008
Ekstrom, G.Dalton, C.A., Ekstrom, G., Dziewonski, A.M.The global attenuation structure of the upper mantle.Journal of Geophysical Research, Vol. 113, B9, B09303.MantleTectonics
DS200812-0619
2008
Ekstrom, G.Kustowski, B., Ekstrom, G., Dziewonski, A.M.Anisotropic shear wave velocity structure of the Earth's mantle: a global model.Journal of Geophysical Research, Vol. 113, B6306.MantleModel
DS200812-0620
2008
Ekstrom, G.Kustowski, B., Ekstrom, G., Dziewonski, A.M.Anisotropic shear wave velocity structure of the Earth's mantle: a global model.Journal of Geophysical Research, Vol. 113, B06306MantleTomography
DS201805-0952
2017
El Aouli, EH.Ikenne, M., Lahna, A.A., Soderlund, U., Tassinar, C.C.G., Ernst, R.E., Pin, Ch., Youbi, N., El Aouli, EH., Hafid, A., Admou, H., Mata, J., Bouougri, EH., Boumehdi, M.A.New Mesoproterozoic age constraints for the Taghdout Group, Anti-Atlas ( Morocco): toward a new lithostratigra[hic framework for the Precambrian in the NW margin of the West African Craton.The First West African Craton and Margins International Workshop WACMA, Held Apr. 24-29. 1p. AbstractAfrica, Moroccogeochronology
DS2002-0005
2002
El Araby, H.M.Abdelrahman, E.S.M., El Araby, H.M., El Araby, T.M., Essa, K.S.A new approach to depth determination from magnetic anomaliesGeophysics, Vol. 67, 5, pp. 1524-31.GlobalGeophysics - magnetics not specific to diamonds
DS2002-0005
2002
El Araby, T.M.Abdelrahman, E.S.M., El Araby, H.M., El Araby, T.M., Essa, K.S.A new approach to depth determination from magnetic anomaliesGeophysics, Vol. 67, 5, pp. 1524-31.GlobalGeophysics - magnetics not specific to diamonds
DS200412-0001
2003
El Araby, T.M.Abdelrahman, E.M., El Araby, T.M., Essa, K.S.A least squares minimisation approach to depth, index parameter, and amplitude coefficient determination from magnetic anomaliesExploration Geophysics, Vol. 34, pp. 241-248.TechnologyGeophysics - magnetics, dykes, ( not specific to diamon
DS201312-0061
2012
El Archi, A.Bea, F., Montero, P., Haissen, F., El Archi, A.2.46 Ga kasilite and nepheline syenites from the Awsard plution, Reguibat Rise of the West African Craton, Morocco. Generation of extremely K-rich magmas at the Archean-Proterozoic transition.Precambrian Research, Vol. 224, pp. 242-254.Africa, MoroccoUltrapotassic rocks
DS201312-0239
2013
El Atrassi, F.El Atrassi, F., Brunet, F., Chazot, G., Bouybaouene, M., Chopin, C.Metamorphic and magmatic overprint of garnet pyroxenites from the Beni Bousera massif ( northern Morocco): petrography, mineral chemistry and thermobarometry.Lithos, Vol. 179, pp. 231-248.Africa, MoroccoBeniBoussera
DS201312-0240
2013
El Atrassi, F.El Atrassi, F., Brunet, F., Chazot, G., Chopin, C.Metamorphic and magmatic overprint of garnet pyroxenites from the Beni Bousera Massif ( northern Morocco): mineralogical, chemical and textural records.Goldschmidt 2013, AbstractAfrica, MoroccoPyroxenite
DS201412-0221
2014
El Atrassi, F.El Atrassi, F., Chazot, G., Brunet, F., Chopin, C., Bouybaouene, M.Amphibole genesis in pyroxenites from the Beni Bousera peridotite massif ( Rif, Morocco): evidence for two different metasomatic episodes.Lithos, Vol. 208-209, pp. 67-80.Africa, MoroccoMetasomatism
DS200512-0337
2004
El Azzouzi, M.Gill, R.C., Aparicio, A., El Azzouzi, M., Hernandez, J., Thirlwall, M.F., Bourgois, J., Marriner, G.F.Depleted arc volcanism in the Alboran Sea and shoshonitic volcanism in Morocco: geochemical and isotopic constraints on Neogene tectonic processes.Lithos, Vol. 78, 4, pp. 363-388.Africa, MoroccoShoshonite
DS201312-0241
2013
El Bahat, A.El Bahat, A., Ikenne, M., Soderlund, U., Cousens, B., Youbi, N., Ernst, R., Soulaimani, A., El Janati, M., Hafid, A.U PB baddeleyite ages and geochemistry of dolerite dykes in the Bas Draa In lier of the Anti-Atlas of Morocco: newly identified Ma event in the West African craton.Lithos, Vol. 174, pp. 85-98.Africa, MoroccoGeochronology
DS201312-0999
2013
El Bahat, A.Youbi, N., Kouyate, D., Soderlund, U., Ernst, R.E., Soulaimani, A., Hafid, A., Ikenne, M., El Bahat, A., Betrand, H., Chaham, K.R., Ben Abbou, M., Mortaji, A., El Ghorfi, M., Zouhair, M., El Janati, M.The 1750 Ma magmatic event of the West African Craton ( Anti-Atlas) Morocco.Precambrian Research, Vol. 236, pp. 106-123.Africa, MoroccoDike swarms
DS201412-0321
2014
El Basbas, A.Groulier, P.A., Andre-Mayer, A.S., Ohnenstetter, D., Zeh, A., Moukhsil, A., Solgadi, F., El Basbas, A.Petrology, geochemistry and age of the Crevier alkaline intrusion.GAC-MAC Annual Meeting May, abstract 1p.Canada, QuebecAlkalic
DS1991-0250
1991
El Boukhari, A.Chabane, A., El Boukhari, A., Rocci, G., Tane, J.L.Discovery of Island Arc magmatics of boninitic affinity related to Pan-African ophiolite of Khzama(Siroua, Anti-Atlas, Morocco).(in French)Comptes Rendus de l'Academie des Sciences series II, (in French), Vol. 313, No. 11 November 21, pp. 1301-1304MoroccoOphiolites, Magma
DS202001-0007
2019
El Dien, H.G.Doucet, L-S., Li, Z-X., Kirscher, U., El Dien, H.G.Coupled supercontinent -mantle plume events evidenced by oceanic plume record.Geology, Vol. 48, 5p. Mantleplumes, hotspots
DS202001-0010
2019
El Dien, H.G.El Dien, H.G., Doucet, L.S., Li, Z-X.Global geochemical fingerprinting of plume intensity suggests coupling with the supercontinent cycle.Nature Communications, Vol 10, 1, doi.org/10.1038 /s41467-019-13300 8p. PdfMantleplumes, hotspots

Abstract: Plate tectonics and mantle plumes are two of the most fundamental solid-Earth processes that have operated through much of Earth history. For the past 300 million years, mantle plumes are known to derive mostly from two large low shear velocity provinces (LLSVPs) above the core-mantle boundary, referred to as the African and Pacific superplumes, but their possible connection with plate tectonics is debated. Here, we demonstrate that transition elements (Ni, Cr, and Fe/Mn) in basaltic rocks can be used to trace plume-related magmatism through Earth history. Our analysis indicates the presence of a direct relationship between the intensity of plume magmatism and the supercontinent cycle, suggesting a possible dynamic coupling between supercontinent and superplume events. In addition, our analysis shows a consistent sudden drop in MgO, Ni and Cr at ~3.2-3.0 billion years ago, possibly indicating an abrupt change in mantle temperature at the start of global plate tectonics.
DS202007-1138
2020
El Dien, H.G.El Dien, H.G., Doucet, L.S., Murphy, J.B., Li, Z-X.Geochemical evidence for a widespread mantle re-enrichment 3.2 billion years ago: implications for global-scale plate tectonics.Scientific Reports, Vol. 10, 9461 8 pdfMantlemelting

Abstract: Progressive mantle melting during the Earth’s earliest evolution led to the formation of a depleted mantle and a continental crust enriched in highly incompatible elements. Re-enrichment of Earth’s mantle can occur when continental crustal materials begin to founder into the mantle by either subduction or, to a lesser degree, by delamination processes, profoundly affecting the mantle’s trace element and volatile compositions. Deciphering when mantle re-enrichment/refertilization became a global-scale process would reveal the onset of efficient mass transfer of crust to the mantle and potentially when plate tectonic processes became operative on a global-scale. Here we document the onset of mantle re-enrichment/refertilization by comparing the abundances of petrogenetically significant isotopic values and key ratios of highly incompatible elements compared to lithophile elements in Archean to Early-Proterozoic mantle-derived melts (i.e., basalts and komatiites). Basalts and komatiites both record a rapid-change in mantle chemistry around 3.2 billion years ago (Ga) signifying a fundamental change in Earth geodynamics. This rapid-change is recorded in Nd isotopes and in key trace element ratios that reflect a fundamental shift in the balance between fluid-mobile and incompatible elements (i.e., Ba/La, Ba/Nb, U/Nb, Pb/Nd and Pb/Ce) in basaltic and komatiitic rocks. These geochemical proxies display a significant increase in magnitude and variability after ~3.2 Ga. We hypothesize that rapid increases in mantle heterogeneity indicate the recycling of supracrustal materials back into Earth’s mantle via subduction. Our new observations thus point to a?=?3.2 Ga onset of global subduction processes via plate tectonics.
DS2001-0293
2001
El Din, A.El Din, A., El Shazly, K.Are pressures for blueschists and eclogites overestimated? the case from northeast Oman.Lithos, Vol. 56, No. 2-3, Mar. pp. 231-64.OmanThermobarometry, geothermometry, Eclogites
DS1998-0339
1998
El Fadili, S.Demaiffe, D., El Fadili, S., Andre, L.Geochemical and isotopic (Strontium, neodymium) study of eclogite nodules from the Mbuji Mayi kimberlites, Kasai, Congo.7th International Kimberlite Conference Abstract, pp. 190-192.GlobalGeochemistry, Deposit - Mbuji Mayi
DS1998-0388
1998
El Fadili, S.El Fadili, S., Demaiffe, D.Petrology, mineral chemistry and thermobarometry of eclogite nodules From the Mbuji Mayi kimberlite, Kasai7th International Kimberlite Conference Abstract, pp. 205-7.GlobalPetrology, Deposit - Mbuji Mayi
DS201312-0999
2013
El Ghorfi, M.Youbi, N., Kouyate, D., Soderlund, U., Ernst, R.E., Soulaimani, A., Hafid, A., Ikenne, M., El Bahat, A., Betrand, H., Chaham, K.R., Ben Abbou, M., Mortaji, A., El Ghorfi, M., Zouhair, M., El Janati, M.The 1750 Ma magmatic event of the West African Craton ( Anti-Atlas) Morocco.Precambrian Research, Vol. 236, pp. 106-123.Africa, MoroccoDike swarms
DS2002-1100
2002
El Goresy, A.Mostefaoui, S., El Goresy, A., Hopper, P., Gillet, P., Ott, U.Mode of occurrence , textural settings and nitrogen isotopic compositions of in situEarth and Planetary Science Letters, Vol. 204, No. 1-2, pp. 89-100.GlobalMeteorites - diamonds, geochronology
DS2003-0379
2003
El Goresy, A.El Goresy, A., Dubrovinsky, L.S., Gillet, P., Mostefaoul, S., Graup, G.A new natural super hard transparent polymorph of carbon from the Popigai impactComptes Rendus Geosciences, IN FRENCH, Vol. 335, 12, Oct. pp. 889-898.RussiaBlank
DS200412-0515
2003
El Goresy, A.El Goresy, A., Dubrovinsky, L.S., Gillet, P., Mostefaoul, S., Graup, G., Drakopoulos, M., Simionovici, A.S.A new natural super hard transparent polymorph of carbon from the Popigai impact crater, Russia.Comptes Rendus Geoscience, Vol. 335, 12, Oct. pp. 889-898.RussiaLonsdaleite, graphite, mineralogy
DS201412-0222
2003
El Goresy, A.El Goresy, A., Dubrovinsky, L.S., Gillet, P., Mostefaoui, S., Graup, G., Drakopoulos, M., Simionovici, A.S., Swamy, V., Masaitis, V.L.A new natural, super-hard, transparent polymorph of carbon from the Popigai impact crater, Russia.Comptes Rendus Geoscience, Vol. 335, pp. 889-898.Russia, YakutiaMeteorite
DS201506-0284
2015
El Goresy, A.Miyahara, M., Ohtani, E., El Goresy, A., Lin, Y., Feng, L.,Zhang, J-C., Gillet, P., Nagase, T., Muto, J., Nishijima, M.Unique large diamonds in a urelilite from Almahat a Sitta TC3, asteroid.Geochimica et Cosmochimica Acta, Vol. 163, pp. 14-26.TechnologyUrelilite
DS201805-0964
2018
El Goresy, A.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.
DS201312-0471
2013
El Gout, R.Khattach, D., Houan, M.R., Corchete, V., Chourak, M., El Gout, R., Ghazala, H.Main crustal discontinuities of Morocco derived from gravity data.Journal of Geodynamics, Vol. 68, pp. 37-48.Africa, MoroccoTectonics
DS1984-0256
1984
El haddad, M.A.El haddad, M.A., Hashad, M.H.The major and minor elements chemistry of Gebel Tarbtie carbonatites southEgyptBulletin. Faculty of Science Sect. C. Assiut Univ, Vol. 13, No. 1, pp. 205-217EgyptSovite
DS200912-0680
2009
El Haimer, F.Z.Sebti, S., Saddiqi, O., El Haimer, F.Z., Michard, A., Ruiz, G., Bousquet, R., Baidder, L., Frizonde Lamotte, D.Vertical movements at the fringe of the West African Craton: first zircon fission track datings from the Anti Atlas Precambrian basement, Morocco.Comptes Rendus Geoscience, Vol. 341, no. 1, pp. 71-77.Africa, MoroccoTectonics
DS201909-2022
2019
El Haloui, R.Benaouda, R., Kraemer, D., Sitnikova, M., Goldmann, S., Freitag, R., Bouali, A., Mouttaqi, A., El Haloui, R., Essaadaoui, M., Bau, M.Thorium-poor monazite and columbite-(Fe) mineralization in the Gleibat Lafhouda carbonatite and its associated iron-oxide-apatite deposit of the Ouled Dlim Massif, South Morocco.Gondwana Research, Vol. 77, pp. 19-39.Africa, MoroccoREE

Abstract: Recent exploration work in South Morocco revealed the occurrence of several carbonatite bodies, including the Paleoproterozoic Gleibat Lafhouda magnesiocarbonatite and its associated iron oxide mineralization, recognized here as iron-oxide-apatite (IOA) deposit type. The Gleibat Lafhouda intrusion is hosted by Archean gneiss and schist and not visibly associated with alkaline rocks. Metasomatized micaceous rocks occur locally at the margins of the carbonatite outcrop and were identified as glimmerite fenite type. Rare earth element (REE) and Nb mineralization is mainly linked to the associated IOA mineralization and is represented by monazite-(Ce) and columbite-(Fe) as major ore minerals. The IOA mineralization mainly consists of magnetite and hematite that usually contain large apatite crystals, quartz and some dolomite. Monazite-(Ce) is closely associated with fluorapatite and occurs as inclusions within the altered parts of apatite and along cracks or as separate phases near apatite. Monazite shows no zonation patterns and very low Th contents (<0.4?wt%), which would be beneficial for commercial extraction of the REE and which indicates monazite formation from apatite as a result of hydrothermal volatile-rich fluids. Similar monazite-apatite mineralization and chemistry also occurs at depth within the carbonatite, although the outcropping carbonatite is barren, suggesting an irregular REE ore distribution within the carbonatite body. The barren carbonatite contains some tiny unidentified secondary Nb-Ta-U phases, synchysite and monazite. Niobium mineralization is commonly represented by anhedral minerals of columbite-(Fe) which occur closely associated with magnetite-hematite and host up to 78?wt% Nb2O5, 7?wt% Ta2O5 and 1.6?wt% Sc2O3. This association may suggest that columbite-(Fe) precipitated by an interaction of Nb-rich fluids with pre-existing Fe-rich minerals or as pseudomorphs after pre-existing Nb minerals like pyrochlore. Our results most strongly suggest that the studied mineralization is economically important and warrants both, further research and exploration with the ultimate goal of mineral extraction.
DS201312-0241
2013
El Janati, M.El Bahat, A., Ikenne, M., Soderlund, U., Cousens, B., Youbi, N., Ernst, R., Soulaimani, A., El Janati, M., Hafid, A.U PB baddeleyite ages and geochemistry of dolerite dykes in the Bas Draa In lier of the Anti-Atlas of Morocco: newly identified Ma event in the West African craton.Lithos, Vol. 174, pp. 85-98.Africa, MoroccoGeochronology
DS201312-0511
2013
El Janati, M.Kouyate, D., Soderlund, U., Youbi, N., Ernst, R., Hafid, A., Ikeene, M., Soulaimani, A., Betrand, H., El Janati, M., Rkha, C.U Pb baddeleyite and zircon ages of 2040 Ma, 1650 Ma and 885 Ma on dolerites in the West African Craton ( Anti-Atlas inliers) : possible links to break up of Precambrian supercontinents.Lithos, Vol. 174, pp. 71-84.AfricaGeochronology
DS201312-0999
2013
El Janati, M.Youbi, N., Kouyate, D., Soderlund, U., Ernst, R.E., Soulaimani, A., Hafid, A., Ikenne, M., El Bahat, A., Betrand, H., Chaham, K.R., Ben Abbou, M., Mortaji, A., El Ghorfi, M., Zouhair, M., El Janati, M.The 1750 Ma magmatic event of the West African Craton ( Anti-Atlas) Morocco.Precambrian Research, Vol. 236, pp. 106-123.Africa, MoroccoDike swarms
DS1992-1497
1992
El Kaliouby, B.Sultan, M., Bickford, M.E., El Kaliouby, B., Arvidson, R.E.Common lead systematics of Precambrian granitic rocks of the Nubian Egypt and tectonic implicationsGeological Society of America (GSA) Bulletin, Vol 104, No. 4, April pp. 456-470EgyptOphiolite, Tectonics
DS2001-0293
2001
El Shazly, K.El Din, A., El Shazly, K.Are pressures for blueschists and eclogites overestimated? the case from northeast Oman.Lithos, Vol. 56, No. 2-3, Mar. pp. 231-64.OmanThermobarometry, geothermometry, Eclogites
DS2003-0001
2003
El-Araby, T.Abdelrahman, E., El-Araby, T., Essa, K.A least square minimisation approach to depth, index parameter and amplitudeExploration Geophysics, (Australian Bulletin), Vol. 34, No. 4, Dec. pp. 241-248.GlobalBlank
DS200712-0001
2007
El-Araby, T.M.Abdelrahman, E.M., Abo-Ezz, E.R., Soliman, K.S., El-Araby, T.M., Essa, K.S.A least squares window curve method for interpretation of magnetic anomalies caused by dipping dikes.Pure and Applied Geophysics, Vol. 164, 5, May pp. 1027-1044.CanadaGeophysics - airborne magnetics
DS201505-0241
2015
Elazar, O.Elazar, O., Kessel, R., Navon, O.Fluids and melts in equlibrium with carbonated hydrous eclogite system at 4-6 Gpa and 900-1200 C.Israel Geological Society, Abstracts 1p.TechnologyEclogite
DS201708-1630
2017
Elazar, O.Elazar, O.Melting of hydrous carbonated eclogite at 4-6 Gpa and 900-1200 C: implications for the generation of diamond forming fluids.11th. International Kimberlite Conference, OralMantlediamond genesis
DS201809-2018
2018
Elazar, O.Elazar, O., Kessel, R., Huang, J-X., Navon, O.Silicic fluid Micro inclusions in a metasomatised eclogite from Roberts Victor.Goldschmidt Conference, 1p. AbstractAfrica, South AfricaDeposit - Roberts Victor

Abstract: We report preliminary results of a systematic search for fluid/melt microinclusions in mantle minerals. “Dusty” garnets from xenolith XRV6 [1], a heavily metasomatised Type I eclogite from Roberts Victor mine, SA, carry many microinclusions (<1 µm). FTIR analyses of "dusty" zones indicate the presence of molecular water in the inclusions and hydroxyl groups in the garnet. EPMA analysis of 136 microinclusions constrains the bulk composition of the microinclusions. Compared to the host garnet, they are enriched in TiO2, FeO, CaO, Na2O and K2O and depleted in Al2O3 and MgO. The silica contents seem to be similar to that of the host garnet. Figure 1: a. Backscatter image of the microinclusions in XRV6 garnet. b. K2O vs. MgO of the clear garnet (red) and the microinclusions (+ their surrounding garnet, blue). Most of the elements form compositional mixing arrays of microinclusion+garnet (Fig. 1b). The arrays trend away from the compositions of large melt pools or secondary minerals found in the xenolith. They point towards the array of silicic to low-Mg carbonatitic high density fluids (HDFs) trapped in diamonds, indicating the role of such fluids in mantle metasomatism.
DS201809-2074
2018
Elazar, O.Navon, O., Elazar, O., Kessel, R.Mantle metasomatism and diamond bearing fluids. BultfonteinGoldschmidt Conference, 1p. AbstractMantlecarbon

Abstract: Diamonds and the fluids that form them are important players in the deep carbon cycle that transforms carbon between mantle and surface reservoirs. However, the role of the high-density fluids (HDFs) that are found in microinclusions in diamonds is not limited to diamond formation. Examination of literature data on metasomatized rocks suggests that some may have formed by interaction of peridotites and eclogites with HDF-like melts. For example, silicic HDFs can explain the evoltion of an orthopyroxenerich vein in a garnet hartzburgite from Bulfontein,SA [1]. The composition that was added to the harzburgite and turned it into an orthopyroxene+olivine+phlogopite+garnet+carbonate +sulfide vein (green ellipse in the figure) lies at the extention of the array of silicic to low-Mg carbonatitic HDFs found in fibrous diamonds (pink diamonds). A silicic HDF (blue diamond) that contributed the added component would evolve into more carbonatitic compositions (arrow). Saline melts found in diamonds carry chloride, carbonate and silicate components, similar to saline hydrous fluids found in harzburgites xenoliths from Pinatubo, Phillipeens [2]. The higher water content in Pinatubo is, most probably, the result of lower temperatures and shallower level, but it attests for the role of saline fluids in metasomatism at the arc environment. In a companion abstract (Elazar et al., this volume) we report the finding of potassium-rich microinclusions in garnets in an eclogite xenolith from Robert Victor, SA. Their composition falls close to that of silicic to low-Mg carbonatitic HDFs in diamonds. Their lower potassium and higher aluminum content suggests derivation by higher degree of partial melting compared with the diamond forming fluids. All of the above observations support the important role of HDF-like melts and fluids in mantle processes.
DS201904-0731
2019
Elazar, O.Elazar, O., Frost, D., Navon, O., Kessel, R.Melting H2O and CO2 bearing eclogite at 4-6 GPa and 900-1200 C: implications for the generation of diamond forming fluids.Geochimica et Cosmochimica Acta, in press available 47p.Mantlemelting, subduction
DS201906-1290
2019
Elazar, O.Elazar, O., Frost, D., Navon, O., Kessel, R.Melting H2O and CO2 bearing eclogite at 4-6 Gpa and 900-1200C: implications for the generation of diamond forming fluids.Geochimica et Cosmochimica Acta, Vol. 255, pp. 69-87.Mantlediamond genesis

Abstract: Eclogites play a significant role in geodynamic processes, transferring large amounts of basaltic material and volatiles (chiefly CO2 and H2O species) into the earth's mantle via subduction. Previous studies of eclogite melting focused on two end member systems: either carbonated or hydrous eclogites. Here we focus on the hydrous carbonated eclogitic system in order to define the position of its solidus and determine the near solidus fluid and melt compositions at 4-6?GPa and 900-1200?°C. Experiments were performed on a rocking multi-anvil press. The total dissolved solids in the equilibrated fluids were analyzed following the cryogenic technique using a LA-ICP-MS. H2O and CO2 content were determined by mass balance calculations. Solid phases were chemically characterized using an EPMA. Garnet and clinopyroxene are present in all experiments, assembling the eclogitic rock. A carbonate phase was detected at all temperatures at 4?GPa and at temperatures below 1200?°C at 5 and 6?GPa. Coesite was observed at all pressures below 1200?°C. The solidus was crossed between 1000 and 1100?°C at 4 and 5?GPa. At 6?GPa we observed a relatively smooth decrease in the H2O and CO2 content of the fluid phase with rising temperature, suggesting the presence of a supercritical fluid. The second critical endpoint is thus defined in this system at ~5.5?GPa and 1050?°C. The composition of fluids and melts reported in this study indicates that the hydrous carbonated eclogite system is a plausible source-rock for high density fluids (HDFs) found in microinclusions in diamonds, specifically for the intermediate compositions along the array spanned between low-Mg carbonatitic HDFs and hydrous-silicic ones. Our results suggest that the whole array reflects melting in a heterogeneous mantle. Melting of water-rich eclogite produces silicic HDFs, carbonate-rich zones will produce carbonatitc