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SDLRC - Scientific Articles all years by Author - Z


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 - Z
Posted/
Published
AuthorTitleSourceRegionKeywords
DS201902-0332
2018
ZWang, Z, Kusky, T.M., Capitanio, F.A.Water transportation ability of flat lying slabs in the mantle transition zone and implications for craton destruction.Tectonophysics, Vol. 723, pp. 95-106.Mantlecraton

Abstract: Water transported by deep subduction to the mantle transition zone (MTZ) that is eventually released and migrates upwards is invoked as a likely cause for hydroweakening and cratonic lithosphere destruction. The destruction of the North China Craton (NCC) during the Mesozoic has been proposed to be related to hydroweakening. However, the source of water related to large-scale craton destruction in the NCC is poorly constrained. Some suggest that the water was mainly released from a flat-lying (or stagnating) slab in the MTZ, whereas others posit that most water was released from a previously existing strongly hydrous MTZ then perturbed by the stagnating subduction in the MTZ layer. In this study, we use numerical modeling to evaluate the water carrying ability of flat-lying slabs in the MTZ with different slab ages and water contents to simulate its maximum value and discuss its potential role on large-scale hydroweakening and craton destruction. Our results reveal that a single flat-lying slab in the MTZ cannot provide enough water for large-scale cratonic lithosphere hydroweakening and thinning. Water estimates invoked for craton destruction as experienced by the NCC can only be the result of long-term piling of multiple slabs in the MTZ or penetrating deeper into the lower mantle.
DS200812-1304
2008
Zaamwani, I.Zaamwani, I.The economics of rough diamond mining and marketing Feb. 11-12.Israel Diamond Industry Conference, 11:00 PMGlobalDiamond markets
DS1991-1917
1991
Zabo, C.Zabo, C., Taylor, L.A.Mantle xenoliths from alkali basalts in the Nograd-Gomor region of Hungary and CzechoslovakiaProceedings of Fifth International Kimberlite Conference held Araxa June 1991, Servico Geologico do Brasil (CPRM) Special, pp. 401-404Hungary, CzechoslovakiaBasalts, xenoliths, petrography, mineral chemistry, Metasomatism, diapirism, deformation
DS1988-0197
1988
Zaborovskii, V.V.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
DS1989-1668
1989
Zaborovskiy, V.V.Yegorov, K.N., Vladimirov, B.M., Zaborovskiy, V.V., et al.Find of a potassic trachyte dike near the Udachnaya kimberlite pipe, Yakutia #1Doklady Academy of Science USSR, Earth Science Section, Vol. 298, No. 1-6, pp. 116-119RussiaDeposit -Udachnaya, Trachyte dike
DS1989-1669
1989
Zaborovskiy, V.V.Yegorov, K.N., Vladimirov, B.M., Zaborovskiy, V.V., NasurdinovFind of a potassic trachyte dike near the Udachnaya kimberlite pipe, Yakutia #2Doklady Academy of Science USSR, Earth Science Section, Vol. 298, No. 1-6, April pp. 116-118RussiaPetrography, Trachyte
DS1975-0215
1975
Zabrodin, V.YU.Zabrodin, V.YU., Malyshev, A.A.New Alkalic Ultramafic and Carbonatite Complex on the Yenisei Ridge.Doklady Academy of Science USSR, Earth Science Section., Vol. 223, No. 1-6, PP. 195-198.RussiaKimberlite
DS1992-1730
1992
Zaburunov, S.A.Zaburunov, S.A.Monitoring our global environmentEarth, Vol. 1, No. 4, July pp. 46-53GlobalEnvironment, Satellites
DS201112-0623
2011
Zaccaria, B.Lucci, F., Cozzupoli, D., Zaccaria, B., White,J., Traversa, G.Mt. Isadalu complex, (Sardinia, Italy): an example of post Hercynian transition from high K calc alkaline to shoshonitic/low K alkaline magmatism.Peralk-Carb 2011, workshop held Tubingen Germany June 16-18, PosterEurope, Italy, SardiniaAlkalic
DS200512-1228
2004
Zaccarini, F.Zaccarini, F., Stumpfl, E.F., Garuti, G.Zirconolite and Zr Th U minerals in chromities of the Finero complex, western Alps, Italy: evidence for carbonatite type metasomatism in a subcontinental ... mantle plume.Canadian Mineralogist, Vol. 42, 6, pp. 1825-1858.Europe, ItalyMantle plume, carbonatite
DS200712-1212
2007
Zaccarini, F.Zaccarini, F., Thalhammer, O.A.R., Princivalle, F., Lenaz, D., Stanley, C.J., Garuti, G.Djerfisherite in the Guli dunite complex, Polar Siberia: a primary or metasomatic phase?Canadian Mineralogist, Vol. 45, 5, Oct. pp. 1201-1211.RussiaMetasomatism
DS2002-0499
2002
Zachary, J.Gao, S.S., Liu, K.H., Chen, C., Hubbard, M., Zachary, J., Zhang, Y.Old rifts never die: crustal thickening across the Midcontinent rift and its possible role in post rifting tectonics.Geological Society of America Annual Meeting Oct. 27-30, Abstract p. 79.AppalachiaTectonics - rifts
DS1920-0299
1926
Zache, H.Scholz, L. , Zache, H.Pomona DiamantenDas Deutsche Kolonialbuch., BERLIN: ANDERMANN VERLAG, PP. 324-330.Southwest Africa, NamibiaDiamonds, Occurrences, Littoral Diamond Placers
DS1998-1620
1998
Zack, T.Zack, T., Brumm, R.Ilmenite/liquid partition coefficients of 26 trace elements determined through ilmenite/clinopyroxene...7th International Kimberlite Conference Abstract, pp. 986-8.GlobalGarnet pyroxenites, Magmatic processes
DS1998-1621
1998
Zack, T.Zack, T., Foley, S., Rivers, T.Trace element partitioning between hydrous minerals ( phengite, zoisite, amphibole) and omphacite: hydrationMineralogical Magazine, Goldschmidt abstract, Vol. 62A, p. 1679-80.GlobalSubduction, Eclogites
DS2002-1765
2002
Zack, T.Zack, T., Foley, S.F., Rivers, T.Equilibrium and disequilibrium trace element partitioning in hydrous eclogites, Trescolmen, Central Alps.Journal of Petrology, Vol. 43, No. 10, Oct.pp. 1947-74.EuropeEclogites - not specific to diamonds
DS2002-1766
2002
Zack, T.Zack, T., Kronz, A., Foley, S.F., Rivers, T.Trace element abundances in rutiles from eclogites and associated garnet mica schistsChemical Geology, Vol. 184, 1-2, pp. 97-122.AlpsSubduction, Heavy minerals - not specific to diamonds
DS2003-1195
2003
Zack, T.Rudnick, R.L., McDonough, W.F.,Tomascak, P.B., Zack, T.Lithium isotopic composition of eclogites - implications for subduction zone processes8 Ikc Www.venuewest.com/8ikc/program.htm, Session 4, AbstractSierra LeoneMantle geochemistry, Deposit - Koidu
DS2003-1539
2003
Zack, T.Zack, T., Tomascak, P.B., Rudnick, R.L., Dalpe, C., McDonough, W.F.Extremely light Li in orogenic eclogites: the role of isotope fractionation duringEarth and Planetary Science Letters, Vol. 208, 3-4, pp. 279-90.MantleEclogites
DS2003-1540
2003
Zack, T.Zack, T., Tomascek, P.R., Rudnick, R.L., Dalpe, C., McDonough, W.F.Extremely light Li in orogenic eclogites: the role of isotope fractionation duringEarth and Planetary Science Letters, Vol. 208, 3-4, March 30, pp.279-90.SwitzerlandSubduction - not specific to diamonds
DS200412-1702
2003
Zack, T.Rudnick, R.L., McDonough, W.F.,Tomascak, P.B., Zack, T.Lithium isotopic composition of eclogites - implications for subduction zone processes.8 IKC Program, Session 4, AbstractAfrica, Sierra LeoneMantle geochemistry Deposit - Koidu
DS200412-2194
2003
Zack, T.Zack, T., Tomascak, P.B., Rudnick, R.L., Dalpe, C., McDonough, W.F.Extremely light Li in orogenic eclogites: the role of isotope fractionation during dehydration in subducted oceanic crust.Earth and Planetary Science Letters, Vol. 208, 3-4, pp. 279-90.MantleEclogite
DS200412-2195
2003
Zack, T.Zack, T., Tomascek, P.R., Rudnick, R.L., Dalpe, C., McDonough, W.F.Extremely light Li in orogenic eclogites: the role of isotope fractionation during dehydration in subducted oceanic crust.Earth and Planetary Science Letters, Vol. 208, 3-4, March 30, pp.279-90.Europe, SwitzerlandSubduction - not specific to diamonds
DS200512-1229
2004
Zack, T.Zack, T., Moraes, R., Kronz, A.Temperature dependence of Zr in rutile: empirical calibration of a rutile thermometer.Contributions to Mineralogy and Petrology, Vol. 148, 4, pp. 471-488.Thermometry
DS200712-0567
2007
Zack, T.Konrad-Schmolke, M., Zack, T., O'Brien, P.J.Trace element partitioning in subducted slabs: constraints from garnet inclusions and thermodynamic modelling.Plates, Plumes, and Paradigms, 1p. abstract p. A510.Mantle, NorwaySubduction, UHP
DS200712-1213
2007
Zack, T.Zack, T., John, T.An evaluation of reactive fluid flow and trace element mobility in subducting slabs.Chemical Geology, Vol. 239, 3-4, April 30, pp. 199-216MantleSubduction
DS200712-1214
2007
Zack, T.Zack, T., Luvizotto, G.L.Application of rutile thermometry to eclogites.Mineralogy and Petrology, Vol. 89, 3-4, pp.TechnologyEclogite
DS200712-1215
2007
Zack, T.Zack, T., Timm, J.An evaluation of reactive fluid flow and trace element mobility in subducting slabs.Chemical Geology, Vol. 237, 1-2, Feb. 15, pp. 5-22.MantleSubduction
DS201112-0433
2011
Zack, T.Hettmann, K., Marks, M., Kressing, K., Zack, T., Wenzel, T., Rehkamper, M., Jacob, D., Markl, G.The geochemistry of thallium and its isotopes in a peralkaline magmatic system.Peralk-Carb 2011, workshop held Tubingen Germany June 16-18, PosterTechnologyMagmatism
DS201810-2307
2018
Zack, T.Cruz-Uribe, A.M., Feineman, M.D., Zack, T., Jacob, D.E.Asssessing trace element (dis) equilibrium and the application of single element thermometers in metamorphic rocks.Lithos, Vol. 314-315, pp. 1-15.Globalthermobarometry

Abstract: Empirical and experimental calibration of single element solubility thermometers, such as Zr-in-rutile, Zr-in-titanite, Ti-in-zircon, and Ti-in-quartz, within the past 13 years has greatly expanded our ability to assess the pressure and temperature conditions of individual minerals associated with specific textures in metamorphic rocks. Combined with advances in in situ techniques for analyzing trace concentrations, this has led to an increase in the combined use of single element thermometers, geochronometers, and isotope ratios, often simultaneously, in metamorphic minerals. Here we review the calibration and application of single element thermometers at the pressure and temperature conditions of interest in metamorphic rocks. We discuss to what extent accessory phase equilibrium and trace element equilibrium are attained in metamorphic systems, and the thermodynamic and kinetic framework within which trace element equilibrium is assessed. As an example, we present a comprehensive study of trace element distribution during rutile replacement by titanite in rocks that experienced high-temperature amphibolite-facies overprinting and those that underwent low-temperature blueschist-facies overprinting from a variety of subduction-related terranes worldwide. We find that trace element distributions approach equilibrium partition coefficients in rocks from amphibolite-facies overprinted terranes, whereas trace element distributions do not approach equilibrium in rocks that experienced blueschist-facies overprinting. We caution that single element thermometers that rely upon slow-diffusing high field strength elements should not be applied to rocks equilibrated at <600 °C unless attainment of trace element equilibrium can be demonstrated.
DS201911-2559
2019
Zack, T.Schmitt, A.K., Zack, T., Kooijman, E., Logvinova, A.M., Sobolev, N.V.U-Pb ages of rare rutile inclusions in diamond indicate entrapment synchronous with kimberlite formation. MirLithos, in press available, 47p. PdfRussiadeposit - Mir
DS202009-1661
2020
Zack, T.Sjoqvist, A.S.L., Zack, T., Honn, D.K., Baxter, E.F.Modification of a rare-earth element deposit by low temperature partial melting during metamorphic overprinting: Norra Karr alkaline complex, southern Sweden.Chemical Geology, Vol. 545, 13p. PdfEurope, SwedenREE

Abstract: Rare-earth elements play a crucial role in modern technologies and are necessary for a transition to a green economy. Potentially economic deposits of these elements are typically hosted in minerals such as monazite, bastnäsite, and eudialyte (a complex Na-Ca-Fe-Zr silicate mineral with Cl), making these prime targets for geological research. Globally, rare-earth mineral deposits commonly show evidence of polyphase development and mineralisation processes, which need to be better understood to improve exploration strategies. The Norra Kärr alkaline complex (Sweden) contains a globally significant deposit of rare-earth elements, hosted in the mineral eudialyte. In this study, we focussed on eudialyte crystals in undeformed, cross-cutting pegmatoid veins from Norra Kärr. In order to determine their age, we refined an established micromilling method to enable sampling of minerals rich in rare-earth elements for precise analysis of major and trace elements, Nd isotope ratios, and Sm-Nd geochronology down to a scale of <200?µm. Mineral samples were subjected to detailed textural and chemical characterisation by backscattered electron imaging and laser ablation inductively coupled plasma mass spectrometry, by which precise and accurate Sm/Nd ratios were determined to steer subsequent micromill sampling for small-aliquot Sm-Nd isotope analysis by isotope dilution thermal ionisation mass spectrometry. Given enough internal spread in Sm/Nd ratios, reliable Sm-Nd isochrons can be derived from discrete textural domains within a single crystal. This provided an age of 1.144?±?0.053?Ga (95% confidence); approximately 350?million?years younger than the magmatic intrusion of the alkaline complex (ca. 1.49?Ga). Primary compositional sector and oscillatory zoning in these eudialyte crystals shows core-to-rim enrichment in rare-earth elements and significant fractionation of K/Rb, Y/Ho, Zr/Hf, and Nb/Ta, which we attribute to crystallisation under influence of complexing ligands in a confined volume. We argue that these mineralised pegmatoid veins formed by low-temperature (<550?°C) partial melting of the agpaitic host rock during an early Sveconorwegian (Grenvillian) metamorphic overprinting event. Given the challenge of directly dating rare-earth ore minerals by conventional methods, modification of rare-earth mineral deposits may be more widespread than already assumed, which shows the importance of investigations that date the rare-earth minerals themselves.
DS1985-0419
1985
Zadnerprovskiy, B.I.Martovitskiy, V.P., Zadnerprovskiy, B.I., Bulenko, N.A.The internal structure of synthetic diamonds with thread likeinclusions.(Russian)Kristallografiya, (Russian), Vol. 30, No. 6, pp. 1203-1206RussiaSynthetic Diamonds, Diamond Morphology
DS1987-0826
1987
Zadnik, M.G.Zadnik, M.G., Smith, C.B., Ott, U., Begemann, F.3HE/4HE in diamonds: higher than solarTerra Cognita, Vol. 7, No. 2, 1p. abstractSouth AfricaFinsch, helium
DS201811-2594
2018
Zaffiro, G.Nestola, F., Prencipe, M., Nimis, P., Zaffiro, G.Toward a robust elastic geobarometry of kyanite inclusions in eclogitic diamonds. VoorspoedJournal of Geophysical Research: Solid Earth, doi: 10.1029/2018JB016012Africa, South Africadiamond inclusions

Abstract: Here we report the first results from elastic geobarometry applied to a kyanite inclusion entrapped within an eclogitic diamond (from Voorspoed mine, South Africa) using micro-Raman and Fourier transform infrared spectroscopy, electron microprobe analysis, ab initio calculations, and finite element modeling. Application of elastic geobarometry to very elastically anisotropic kyanite inclusions is challenging, as current models do not allow for elastic anisotropy. In order to minimize the effects of anisotropy, we have explored the effects of deviatoric stress on Raman modes via ab initio density functional theory. The results allowed us to select the Raman mode (at ca. 638 cm-1) that is the least sensitive to deviatoric stress. The shift of this band in the inclusion while still trapped within the diamond relative to the inclusion in air (once liberated) was used under hydrostatic approximation to determine a residual pressure on the inclusion of 0.184 ± 0.045 GPa and an entrapment pressure of 5.2 ± 0.3 GPa (~160 km depth) for an FTIR N-aggregation residence temperature of 1119 ± 50 °C. This is the first geothermobarometric determination for a diamond from the Voorspoed kimberlite. It overlaps with P-T estimates obtained by traditional chemical geobarometry for diamonds from other kimberlites from the Kaapvaal craton, suggesting that the hydrostatic approximation does not introduce significant errors in the geobarometric evaluation. Our protocol of Raman peak selection can be used for geobarometry of further kyanite-bearing diamonds and may provide a guide for more robust geobarometry of other types of mineral inclusions in diamonds, both eclogitic and peridotitic.
DS201910-2288
2019
Zaffiro, G.Nestola, F., Zaffiro, G., Mazzucchelli, M.L., Nimis, P., Andreozzi, G.B., Periotto, B., Princivalle, F., Lenaz, D., Secco, L., Pasqualetto, L., Logvinova, A.M., Sobolev, N.V., Lorenzetti, A., Harris, J.W.Diamond inclusion system recording old deep lithosphere conditions at Udachnaya ( Siberia).Nature Research, Vol. 9, 12586 8p. PdfRussia, Siberiadeposit - Udachnaya

Abstract: Diamonds and their inclusions are unique fragments of deep Earth, which provide rare samples from inaccessible portions of our planet. Inclusion-free diamonds cannot provide information on depth of formation, which could be crucial to understand how the carbon cycle operated in the past. Inclusions in diamonds, which remain uncorrupted over geological times, may instead provide direct records of deep Earth’s evolution. Here, we applied elastic geothermobarometry to a diamond-magnesiochromite (mchr) host-inclusion pair from the Udachnaya kimberlite (Siberia, Russia), one of the most important sources of natural diamonds. By combining X-ray diffraction and Fourier-transform infrared spectroscopy data with a new elastic model, we obtained entrapment conditions, Ptrap?=?6.5(2) GPa and Ttrap?=?1125(32)-1140(33) °C, for the mchr inclusion. These conditions fall on a ca. 35?mW/m2 geotherm and are colder than the great majority of mantle xenoliths from similar depth in the same kimberlite. Our results indicate that cold cratonic conditions persisted for billions of years to at least 200?km in the local lithosphere. The composition of the mchr also indicates that at this depth the lithosphere was, at least locally, ultra-depleted at the time of diamond formation, as opposed to the melt-metasomatized, enriched composition of most xenoliths.
DS1950-0162
1953
Zafranovskii, I.I.Zafranovskii, I.I.Almazy. #3Moscow: Izdet Akad. Nauk, 154P.RussiaKimberlite, Diamond, Textbook, Biography, Kimberley
DS201802-0274
2017
Zagainy, A.K.Ustinov, V.N., Golubev, Yu.K., Zagainy, A.K., Kukui, I.M., Mikoev, I.L., Lobkova, L.P., Antonov, S.A., Konkin, V.D.Analysis of the African province diamond prospects in relation to the Russia mineral base development abroad. *** IN RUSOtechestvennaya Geologiya ***IN RUS, No. 6, pp. 52-66. pdfAfricadiamond - arenas
DS201802-0275
2017
Zagainy, A.K.Ustinov, V.N., Golubev, Yu.K., Zagainy, A.K., Stegnitsky, Yu.B.The diamond bearing territories of Africa and their importance for expansion of the raw material base of the Russian diamond mining industry. ***IN RUSMineral Resources of Russia: economics and Management *** IN RUS, No. 6, pp. 66-72. pdfAfricadiamond - arenas
DS201802-0283
2017
Zagainy, A.K.Zagainy, A.K., Mikoev, I.L., Ustinov, V.N., Feijo, A., Antonov, S.A.Structural tectonic and geophysical premises of kimberlites localization on the territory of Angola. ***IN RUSOres and Metals ***IN RUS, no. 4, pp. 42-49. pdfAfrica, Angolakimberlite - pipes
DS201805-0985
2018
Zagainy, A.K.Ustinov, V.N., Antaschuk, M.G., Zagainy, A.K., Kukui, I.M., Lobkova, L.P., Antonov, S.A.Prospects of diamond deposits discovery in the North of the East European platform. Karelian - KolaOres and Metals ***RUS, Vol. 1, pp. 11-26. ***RusRussiakimberlite, lamproite, dispersion haloes
DS201810-2386
2018
Zagainy, A.K.Ustinov, V.N., Bartolomeu, A.M.F., Zagainy, A.K., Felix, J.T., Mikoev, I.I., Stegnitskiy, Y.B., Lobkova, L.P., Kukui, I.M., Nikolaeva, E.V., Antonov. S.A.Kimberlites distribution in Angola and prospective areas for new discoveries.Mineralogy and Petrology, doi.org/10.1007/ s00710-018-0628-1 14p.Africa, Angolakimberlites

Abstract: Based on a comprehensive analysis of kimberlite pipes of Angola, including the near surface structural setting, deep lithospheric structure, pipe morphology and emplacement, mineralogical and petrographic features, diamond characteristics and locations of secondary deposits four geographical regions have been outlined within Angola representing four types of diamond bearing potential. These areas include high diamond bearing potential pipes, possible potential, no potential, and unclear potential areas. It was found that the depth of magmatism and diamond potential of kimberlites increases from the Atlantic coast in southwestern Angola into the continent in the north-easterly direction. Areas prospective for the discovery of new primary diamond deposits have been identified.
DS200912-0781
2009
Zagainyi, A.K.Ustinov, V.N., Zagainyi, A.K., Smith, C.B., Ushkov, Lazko, Lukyanova, LobkovaEarly Proterozoic diamond bearing kimberlites of Karelia and their formation pecularities.Russian Geology and Geophysics, Vol. 50, 9, pp. 739-750.RussiaPetrology, Kimozero
DS200512-1230
2003
Zagnitko, V.Zagnitko, V., Krydik, S., Donskiy, M.Isotopic geochemistry of carbonatites of Ukraine.Periodico di Mineralogia, (in english), Vol. LXX11, 1. April, pp. 153-159.Europe, UkraineGeochronology, Chernigovka Complex
DS2000-1045
2000
Zagnitko, V.N.Zagnitko, V.N., Kryvdik, S.G., Parfenova, A.Y.Geochemistry, mineralogy and petrology of carbonatites of UkraineIgc 30th. Brasil, Aug. abstract only 1p.UKraineCarbonatite, Magmatism
DS202002-0202
2020
Zagorevski, A.Lawley, C.J.M., Pearson, G., Waterton, P., Zagorevski, A., Bedard, J.H., Jackson, S.E., Petts, D.C., Kjarsgaard, B.A., Zhang, S., Wright, D.Element and isotopic signature of re-fertilized mantle peridotite as determined by nanopower and olivine LA-ICPMS analyses.Chemical Geology, DOI:101016/ j.chemgeo.2020.119464Mantleperidotite

Abstract: The lithospheric mantle should be depleted in base- and precious-metals as these elements are transferred to the crust during partial melting. However, some melt-depleted mantle peridotites are enriched in these ore-forming elements. This may reflect re-fertilization of the mantle lithosphere and/or sequestering of these elements by residual mantle phase(s). Both processes remain poorly understood because of the low abundances of incompatible elements in peridotite and the nugget-like distribution of digestion-resistant mantle phases that pose analytical challenges for conventional geochemical methods. Herein we report new major and trace element concentrations for a suite of mantle peridotite and pyroxenite samples from the Late Permian to Middle Triassic Nahlin ophiolite (Cache Creek terrane, British Columbia, Canada) using Laser Ablation Inductively Coupled Plasma Mass Spectrometry (LA-ICPMS) analysis of nanoparticulate powders and olivine. Compatible to moderately incompatible element concentrations suggest that Nahlin ophiolite peridotites represent residues after =20% melt extraction. Pyroxenite dykes and replacive dunite bands are folded and closely intercalated with residual harzburgite. These field relationships, coupled with the presence of intergranular base metal sulphide, clinopyroxene and Cr-spinel at the microscale, point to percolating melts that variably re-fertilized melt-depleted mantle peridotite. Radiogenic Pb (206Pb/204Pb?=?15.402-19.050; 207Pb/204Pb?=?15.127-15.633; 208Pb/204Pb?=?34.980-38.434; n?=?45) and Os (187Os/188Os 0.1143-0.5745; n?=?58) isotope compositions for a subset of melt-depleted peridotite samples further support metasomatic re-fertilization of these elements. Other ore-forming elements are also implicated in these metasomatic reactions because some melt-depleted peridotite samples are enriched relative to the primitive mantle, opposite to their expected behaviour during partial melting. New LA-ICPMS analysis of fresh olivine further demonstrates that a significant proportion of the highly incompatible element budget for the most melt-depleted rocks is either hosted by, and/or occurs as trapped inclusions within, the olivine-rich residues. Trapped phases from past melting and/or re-fertilization events are the preferred explanation for unradiogenic Pb isotope compositions and Paleozoic to Paleoproterozoic Re-depletion model ages, which predate the Nahlin ophiolite by over one billion years.
DS201709-1962
2017
Zagrtdenov, N.R.Borisova, A.Y., Zagrtdenov, N.R., Toplis, M.J., Bohrson, W.A., Nedelec, A., Safonov, O.G., Pokrovski, G.S., Ceileneer, G., Melnik, O.E., Bychkov, A.Y., Gurenko, A.A., Shscheka, S., Terehin, A., Polukeev, V.M., Varlamov, D.A., Gouy, S., De Parseval, P.Making Earth's continental crust from serpentinite and basalt. Goldschmidt Conference, abstract 1p.Mantleperidotites

Abstract: How the Earth's continental crust was formed in the Hadean eon is a subject of considerable debates [1-4]. For example, shallow hydrous peridotites [2,5], in particular the Hadean Earth's serpentinites [6], are potentially important ingredients in the creation of the continental ptoto-crust, but the mechanisms of this formation remain elusive. In this work, experiments to explore serpentinite-basalt interaction under conditions of the Hadean Earth were conducted. Kinetic runs lasting 0.5 to 48 hours at 0.2 to 1.0 GPa and 1250 to 1300°C reveal dehydration of serpentinite and release of a Si-Al-Na-K-rich aqueous fluid. For the first time, generation of heterogeneous hydrous silicic melts (56 to 67 wt% SiO2) in response to the fluid-assisted fertilisation and the subsequent partial melting of the dehydrated serpentinite has been discovered. The melts produced at 0.2 GPa have compositions similar to those of the bulk continental crust [2,3]. These new findings imply that the Earth's sialic proto-crust may be generated via fluid-assisted melting of serpentinized peridotite at shallow depths (=7 km) that do not require plate subduction during the Hadean eon. Shallow serpentinite dehydration and melting may be the principal physico-chemical processes affecting the earliest lithosphere. Making Earth's continental crust from serpentinite and basalt.
DS202012-2206
2020
Zagrtdenov, N.R.Borisova, A.Y., Bindeman, I.N., Toplis, M.J., Zagrtdenov, N.R., Guignard, J., Safonov, O.G., Bychkov, A.Y., Shcheka, S., Melnik, O.E., Marcelli, M., Fehrenbach, J.Zircon survival in shallow asthenosphere and deep lithosphere.American Mineralogist, Vol. 105, pp. 1662-1671. pdfMantlemelting

Abstract: Zircon is the most frequently used mineral for dating terrestrial and extraterrestrial rocks. However, the system of zircon in mafic/ultramafic melts has been rarely explored experimentally and most existing models based on the felsic, intermediate and/or synthetic systems are probably not applicable for prediction of zircon survival in terrestrial shallow asthenosphere. In order to determine the zircon stability in such natural systems, we have performed high-temperature experiments of zircon dissolution in natural mid-ocean ridge basaltic and synthetic haplobasaltic melts coupled with in situ electron probe microanalyses of the experimental products at high current. Taking into account the secondary fluorescence effect in zircon glass pairs during electron microprobe analysis, we have calculated zirconium diffusion coefficient necessary to predict zircon survival in asthenospheric melts of tholeiitic basalt composition. The data imply that typical 100 micron zircons dissolve rapidly (in 10 hours) and congruently upon the reaction with basaltic melt at mantle pressures. We observed incongruent (to crystal ZrO2 and SiO2 in melt) dissolution of zircon in natural mid-ocean ridge basaltic melt at low pressures and in haplobasaltic melt at elevated pressure. Our experimental data raise questions about the origin of zircons in mafic and ultramafic rocks, in particular, in shallow oceanic asthenosphere and deep lithosphere, as well as the meaning of the zircon-based ages estimated from the composition of these minerals. Large size zircon megacrysts in kimberlites, peridotites, alkali basalts and other magmas suggest the fast transport and short interaction between zircon and melt.The origin of zircon megacrysts is likely related to metasomatic addition of Zr into mantle as any mantle melting episode should obliterate them.
DS1990-0453
1990
Zagruzina, I.A.Erich, E.I., Sutherland, W.M., Hausel, W.D., Zagruzina, I.A.Temporal distribution of the ultramafic-alkalic and alkalic rocks withIn the Russian, Siberian and North American ancient platforms and theirsurroundingsGeological Survey of Wyoming Open File Report, No. 89-9, 33pWyoming, RussiaAlkaline rocks, Craton
DS201505-0239
2015
Zahirovic, S.Zahirovic, S., Muller, R.D., Seton, M., Flament, N.Tectonic speed limits from plate kinematic reconstructions.Earth and Planetary Science Letters, Vol. 418, pp. 40-52.GlobalPlate Tectonics
DS201906-1327
2019
Zahirovic, S.Muller, R.D., Zahirovic, S., Williams, S.E., Cannon, J., Seton, M., Bower, D.J., Tetley, M., Heine, C., Le Breton, E., Liu, S., Russell, S.H.J., Yang, T., Leonard, J., Gurnis, M.A global plate model including lithospheric deformation along major rifts and orogens since the Triassic.Tectonics, May 5, 36p. Mantleplate tectonics

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

Abstract: Global deep-time plate motion models have traditionally followed a classical rigid plate approach, even though plate deformation is known to be significant. Here we present a global Mesozoic-Cenozoic deforming plate motion model that captures the progressive extension of all continental margins since the initiation of rifting within Pangea at ~240 Ma. The model also includes major failed continental rifts and compressional deformation along collision zones. The outlines and timing of regional deformation episodes are reconstructed from a wealth of published regional tectonic models and associated geological and geophysical data. We reconstruct absolute plate motions in a mantle reference frame with a joint global inversion using hot spot tracks for the last 80 million years and minimizing global trench migration velocities and net lithospheric rotation. In our optimized model, net rotation is consistently below 0.2°/Myr, and trench migration scatter is substantially reduced. Distributed plate deformation reaches a Mesozoic peak of 30 × 106 km2 in the Late Jurassic (~160-155 Ma), driven by a vast network of rift systems. After a mid-Cretaceous drop in deformation, it reaches a high of 48 x 106 km2 in the Late Eocene (~35 Ma), driven by the progressive growth of plate collisions and the formation of new rift systems. About a third of the continental crustal area has been deformed since 240 Ma, partitioned roughly into 65% extension and 35% compression. This community plate model provides a framework for building detailed regional deforming plate networks and form a constraint for models of basin evolution and the plate-mantle system.
DS1994-1974
1994
Zahn, R.Zahn, R.Core correlations... revolution in our thinking on climate variabilityNature, Vol. 371, Sept. 22, pp. 289-290GlobalCore correlations, Ice cores
DS201012-0240
2010
Zahnie, K.Goldblatt, C., Zahnie, K.The subduction origin of mantle nitrogen.Goldschmidt 2010 abstracts, abstractMantleNitrogen
DS1993-1175
1993
Zahnle, K.Ozima, M., Zahnle, K.Mantle degassing and atmospheric evolution: noble gas viewGeochemical Journal, Vol. 27, No. 4/5, pp. 185-200MantleAtmospheric evolution, Geochronology - noble gases
DS1995-1918
1995
Zahnle, K.Toon, O., Zahnle, K.All impacts great and smallGeotimes, Vol. 40, No. 3, March pp. 21-23GlobalImpacts
DS2002-1767
2002
Zahnle, K.Zahnle, K., Sleep, N.H.Carbon dioxide cycling through the mantle and implications for the climate of ancient Earth.Geological Society of London Special Publication, No. 199, pp. 231-58.MantleGeochemistry
DS200512-0715
2005
Zahnle, K.Meibom, A., Sleep, N.H., Zahnle, K., Anderson, D.L.Models for noble gases in mantle geochemistry: some observations and alternatives.Plates, Plumes, and Paradigms, pp. 347-364. ( total book 861p. $ 144.00)MantleGeochemistry
DS201808-1724
2018
Zahnle, K.Avice, G., Marty, B., Burgess, R., Hofmann, A., Philippot, P., Zahnle, K., Zakharov, D.Evolution of atmospheric xenon and other noble gases inferred from Archean to Paleoproterozoic rocks.Geochimica et Cosmochimica Acta, Vol. 232, pp. 82-100.Mantlegeochemistry

Abstract: We have analyzed ancient atmospheric gases trapped in fluid inclusions contained in minerals of Archean (3.3?Ga) to Paleozoic (404?Ma) rocks in an attempt to document the evolution of the elemental composition and isotopic signature of the atmosphere with time. Doing so, we aimed at understanding how physical and chemical processes acted over geological time to shape the modern atmosphere. Modern atmospheric xenon is enriched in heavy isotopes by 30-40‰ u-1 relative to Solar or Chondritic xenon. Previous studies demonstrated that, 3.3?Ga ago, atmospheric xenon was isotopically fractionated (enriched in the light isotopes) relative to the modern atmosphere, by 12.9?±?1.2 (1s) ‰ u-1, whereas krypton was isotopically identical to modern atmospheric Kr. Details about the specific and progressive isotopic fractionation of Xe during the Archean, originally proposed by Pujol et al. (2011), are now well established by this work. Xe isotope fractionation has evolved from 21‰ u-1 at 3.5?Ga to 12.9‰ u-1 at 3.3?Ga. The current dataset provides some evidence for stabilization of the Xe fractionation between 3.3 and 2.7?Ga. However, further studies will be needed to confirm this observation. After 2.7?Ga, the composition kept evolving and reach the modern-like atmospheric Xe composition at around 2.1?Ga ago. Xenon may be the second atmospheric element, after sulfur, to show a secular isotope evolution during the Archean that ended shortly after the Archean-Proterozoic transition. Fractionation of xenon indicates that xenon escaped from Earth, probably as an ion, and that Xe escape stopped when the atmosphere became oxygen-rich. We speculate that the Xe escape was enabled by a vigorous hydrogen escape on the early anoxic Earth. Organic hazes, scavenging isotopically heavy Xe, could also have played a role in the evolution of atmospheric Xe. For 3.3?Ga-old samples, Ar-N2 correlations are consistent with a partial pressure of nitrogen (pN2) in the Archean atmosphere similar to, or lower than, the modern one, thus requiring other processes than a high pN2 to keep the Earth's surface warm despite a fainter Sun. The nitrogen isotope composition of the atmosphere at 3.3?Ga was already modern-like, attesting to inefficient nitrogen escape to space since that time.
DS200612-1582
2006
Zahnle, K.J.Zahnle, K.J.Earth's earliest atmosphere.Elements, Vol. 3, no. 4, August pp. 217-222.MantleEvolution, zircon, impacts
DS201912-2837
2019
Zahnle, K.J.Zahnle, K.J., Gacesa, M., Catling, D.C.Strange messenger: a new history of hydrogen on Earth, as told by xenon.Geochimica et Cosmochimica Acta, Vol. 244, pp. 56-85.Mantleconvection

Abstract: Atmospheric xenon is strongly mass fractionated, the result of a process that apparently continued through the Archean and perhaps beyond. Previous models that explain Xe fractionation by hydrodynamic hydrogen escape cannot gracefully explain how Xe escaped when Ar and Kr did not, nor allow Xe to escape in the Archean. Here we show that Xe is the only noble gas that can escape as an ion in a photo-ionized hydrogen wind, possible in the absence of a geomagnetic field or along polar magnetic field lines that open into interplanetary space. To quantify the hypothesis we construct new 1-D models of hydrodynamic diffusion-limited hydrogen escape from highly-irradiated CO2-H2-H atmospheres. The models reveal three minimum requirements for Xe escape: solar EUV irradiation needs to exceed that of the modern Sun; the total hydrogen mixing ratio in the atmosphere needs to exceed 1% (equiv. to CH4); and transport amongst the ions in the lower ionosphere needs to lift the Xe ions to the base of the outflowing hydrogen corona. The long duration of Xe escape implies that, if a constant process, Earth lost the hydrogen from at least one ocean of water, roughly evenly split between the Hadean and the Archean. However, to account for both Xe’s fractionation and also its depletion with respect to Kr and primordial 244Pu, Xe escape must have been limited to small apertures or short episodes, which suggests that Xe escape was restricted to polar windows by a geomagnetic field, or dominated by outbursts of high solar activity, or limited to transient episodes of abundant hydrogen, or a combination of these. Xenon escape stopped when the hydrogen (or methane) mixing ratio became too small, or EUV radiation from the aging Sun became too weak, or charge exchange between Xe+ and O2 rendered Xe neutral. In our model, Xe fractionation attests to an extended history of hydrogen escape and Earth oxidation preceding and ending with the Great Oxidation Event (GOE).
DS2003-0699
2003
Zahynacz, R.Kellett, R.L., Zahynacz, R., Steensma, G.The role of borehole geophysics in improving the geophysical imaging of kimberlites in a8 Ikc Www.venuewest.com/8ikc/program.htm, Session 8, POSTER abstractAlbertaStratigraphy
DS200412-0970
2003
Zahynacz, R.Kellett, R.L., Zahynacz, R., Steensma, G.The role of borehole geophysics in improving the geophysical imaging of kimberlites in a sedimentary setting: Alberta, Canada.8 IKC Program, Session 8, POSTER abstractCanada, AlbertaDiamond exploration Stratigraphy
DS1988-0609
1988
Zaichenko, M.V.Sandomirskii, S.A., Zaichenko, M.V.Seperation of multicomponent geochemical anomalies related tokimberlitepipes.(Russian)Geokhim. Krit. Kolichestv. Otsenki Skryt. Orud., (Russian), pp. 13-18RussiaBlank
DS202008-1449
2020
Zaikin, P.A.Sokol, I.A., Sokol, A.G., Zaikin, P.A., Tomilenko, A.A., Bulbak, T.A.Hydrogenation of graphite, diamond, carbonates and iron carbides as the source of hydrocarbons in the upper mantle.Goldschmidt 2020, 1p. AbstractMantlehydrogen

Abstract: Formation of hydrocarbons by reactions of hydrogenbearing fluids with carbon [1] (13C soot, graphite, or diamond), carbonate-bearing pelites [2] and iron carbides (Fe3C and Fe7C3) [3] was simulated at 5.5-7.8 GPa and 1100- 1400°C, fH2 in Pt and Au capsules being controlled at the Mo+MoO2+H2O or Fe+FeO+H2O equilibria. For the first time, formation of hydrocarbons from inorganic compounds was proved by the reaction of 13C with hydrogen, which yielded isotopically pure alkanes. The greatest amounts of HCs (CH4/C2H6 < 1, CH4/C3H8 and CH4/C4H10 = 10) formed at 1400°C in the 10-hr run. The amount of HCs synthesized at 1200°C was twice smaller. The rate of HCs formation was slowest in runs with diamond. At 1200 °C, light alkanes (C1˜C2>C3>C4) formed either by direct hydrogenation of Fe3C or Fe7C3, or by hydrogenation of graphite/diamond in the presence of Fe3C, Fe7C3. The CH4/C2H6 ratio in the fluids decreased from 5 to 0.5 with decreasing iron activity and the C fraction increased in the series: Fe-Fe3C?Fe3C- Fe7C3?Fe7C3-graphite?graphite-Fe3C-magnesite and Fe3C-H2O-CO2 systems at 1200 °C yielded magnesiowüstite and wüstite, respectively, and both produced C-rich Fe7C3 and mainly light alkanes (C1˜C2>C3>C4). In the experiments containing pelites methaneimine (CH3N) was found to be the main N-bearing compound. The experiments have provided the first unambiguous evidence that volatile-rich and reduced mantles of terrestrial planets (at fO2 near or below IW) provided favorable conditions for abiotic generation of complex hydrocarbon systems that predominantly contain light alkanes. The conditions favorable for HC formation exist in earth mantle, where slab-derived H2O-, CO2- and carbonate-bearing fluids interact with metal-saturated mantle.
DS1987-0827
1987
Zaikov, V.V.Zaikov, V.V., Zaikova, E.V., Kashintsev, G.L.Petrochemical heterogeneity of basaltic rocks of the ophiolitic association in the southern Mugodzhary (USSR).(Russian)Geochemistry International (Geokhimiya) Vulkan. I Osad. Porod. Yuzh. Urala, Sverdlovsk, (Russian), pp. 5-12RussiaOphiolite
DS1987-0827
1987
Zaikova, E.V.Zaikov, V.V., Zaikova, E.V., Kashintsev, G.L.Petrochemical heterogeneity of basaltic rocks of the ophiolitic association in the southern Mugodzhary (USSR).(Russian)Geochemistry International (Geokhimiya) Vulkan. I Osad. Porod. Yuzh. Urala, Sverdlovsk, (Russian), pp. 5-12RussiaOphiolite
DS1991-1485
1991
Zairsev, A.I.Safronov, A.F., Suvorov, V.D., Zairsev, A.I., Nenashev, N.I.Kimberlite controlling zones in the crust and uppermost mantle of the westYakutia: their composition and evolutionProceedings of Fifth International Kimberlite Conference held Araxa June 1991, Servico Geologico do Brasil (CPRM) Special, pp. 541-542RussiaGeophysics -seismics, Kimberlite controlling zone KCZ
DS1995-2113
1995
Zairsev, A.I.Zairsev, A.I., Safronov, A.F.Main epochs of upper mantle activization in the Siberian PlatformProceedings of the Sixth International Kimberlite Conference Abstracts, pp. 675-677.Russia, SiberiaGeochronology, Deposit -Mir, Udachnaya, Komosomolskaya, Jubilee
DS1996-1053
1996
ZaitsevOleinikov, O.B., Safronov, A.F., Kornilova, V.P., ZaitsevA first find of melanephelinite xenolith in kimberlite rocksRussian Geology and Geophysics, Vol. 37, No. 6, pp. 54-58.Russia, YakutiaXenolith, Deposit - Obnazhennaya
DS2001-1084
2001
ZaitsevSitnikova, M.A., Zaitsev, Wall, Chakmouradian, SubbotinEvolution of chemical composition of rock forming carbonates in Sallanlatvi carbonatites, Kola PeninsulaJournal of South African Earth Sciences, Vol. 32, No. 1, p. A 34.(abs)Russia, Kola PeninsulaCarbonatite, Sallanlatvi Complex
DS200812-0786
2008
ZaitsevNasdala, L., Gigler, Wildner, Grambole, Zaitsev, Harris, Hofmeister, Milledge, SatitkuneAlpha radiation damage in diamond.Goldschmidt Conference 2008, Abstract p.A672.TechnologyDiamond morphology
DS201112-0812
2011
ZaitsevPolyakova, E.A., Chakhmouradian, A.R., Siidra ,Britvin, Petrov, Spratt, Williams, Stanley, ZaitsevFluorine, yttrium and lanthanide rich cerianite from carbonatitic rocks of the Kerimasi volcano and surrounding explosion craters, Gregory Rift.Peralk-Carb 2011, workshop held Tubingen Germany June 16-18, PosterAfrica, TanzaniaCarbonatite
DS1994-1975
1994
Zaitsev, A.Zaitsev, A., Polzhaeva, L.Dolomite calcite textures in carbonatites of the Kovdor ore deposit, KolaPeninsula: their genesis and application for calcite-dolomite geotherm.Contr. Mineralogy and Petrology, Vol. 116, No. 3, pp. 339-344.Russia, Kola PeninsulaCarbonatite, Deposit -Kovdor
DS1995-2114
1995
Zaitsev, A.Zaitsev, A., Bell, K.Strontium and neodymium isotopic dat a of apatite, calcite and dolomite as indicators of source and the relationsihipsContributions to Mineralogy and Petrology, Vol. 121, No. 3, pp. 324-335.Russia, Kola PeninsulaKovdor massif, Phoscorites, Carbonatite
DS1997-0088
1997
Zaitsev, A.Bell, K., Zaitsev, A.Chemistry and lead isotopic composition of galena from rare earth elements (REE) carbonatitesKola, Russia.Geological Association of Canada (GAC) Abstracts, POSTER.Russia, Kola PeninsulaCarbonatite
DS1997-1287
1997
Zaitsev, A.Zaitsev, A., Wall, F., Bell, K., Le Bas, M.Minerals from the Khibin a carbonatites, Kola Peninsula, their paragenesis and evolution.Geological Association of Canada (GAC) Abstracts, POSTER.Russia, Kola PeninsulaCarbonatite, Deposit - Khibina
DS200712-0522
2007
Zaitsev, A.Keller, J., Zaitsev, A., Klaudius, D.J.Geochemistry and petrogenetic significance of natrocarbonatites at Oidoinyo Lengai, Tanzania.Plates, Plumes, and Paradigms, 1p. abstract p. A475.Africa, TanzaniaOidoinyo Lengai
DS200712-0986
2007
Zaitsev, A.Shokodzinskii, V., Zaitsev, A.Constraints on diamond genesis from the study of the dependence of diamond properties on the composition of kimberlites and lamproites.Russian Journal of Pacific Geology, Vol. 1, no. 4, pp. 390-399.MantleDiamond genesis
DS200812-0279
2008
Zaitsev, A.Deijanin, B., Simic, D., Zaitsev, A., Chapman, J., Dobrinets, I., Widemann, A., Del Re, N., Middleton, T., Dijanin, E., Se Stefano, A.Characterization of pink diamonds of different origin: natural ( Argyle, non-Argyle), irradiated and annealed, treated with multi-process, coated and synthetic.Diamond and Related Materials, Vol. 17, 7-10, pp. 1169-1178.AustraliaPink diamonds
DS201112-0513
2011
Zaitsev, A.Keller, J., Zaitsev, A.Natrocarbonatite petrogenesis: compositional variation and relationships to peralkaline silicate magmas.Peralk-Carb 2011... workshop June 16-18, Tubingen, Germany, Abstract p. 66-68.Africa, TanzaniaOldoinyo Lengai
DS201112-0514
2011
Zaitsev, A.Keller, J., Zaitsev, A.Natrocarbonatite petrogenesis: compositional variation and relationships to peralkaline silicate magmas.Peralk-Carb 2011... workshop June 16-18, Tubingen, Germany, Abstract p. 66-68.Africa, TanzaniaOldoinyo Lengai
DS201112-1147
2011
Zaitsev, A.Zaitsev, A.Natrocarbonatites at Sadiman and Tinderent volcanoes, East African Rift - myth or reality?Peralk-Carb 2011, workshop held Tubingen Germany June 16-18, AbstractAfrica, TanzaniaCarbonatite
DS201212-0671
2012
Zaitsev, A.Smelov, A.P., Zaitsev, A.The age and localization of kimberlite magmatism in the Yakutian kimberlite province - constraints from isotope geochronology.10th. International Kimberlite Conference Held Bangalore India Feb. 6-11, Poster abstractRussia, YakutiaGeochronology
DS202004-0548
2020
Zaitsev, A.Zaitsev, A., Kazuchits, N.M., Kazuchits, V.N., Wang, W.Nitrogen doped CVD diamond: nitrogen concentration, color and internal stress.Diamond and Related Materials, March Globalsynthetics

Abstract: Single crystal CVD diamond has been grown on (100)-oriented CVD diamond seed in six layers to a total thickness of 4.3 mm, each layer being grown in gas with increasing concentration of nitrogen. The nitrogen doping efficiency, distribution of color and internal stress have been studied by SIMS, optical absorption, Raman spectroscopy and birefringence imaging. It is shown that nitrogen doping is very non-uniform. This non-uniformity is explained by the terraced growth of CVD diamond. The color of the nitrogen-doped diamond is grayish-brown with color intensity gradually increasing with nitrogen concentration. The absorption spectra are analyzed in terms of two continua representing brown and gray color components. The brown absorption continuum exponentially rises towards short wavelength. Its intensity correlates with the concentration of nitrogen C-defects. Small vacancy clusters are discussed as the defects responsible for the brown absorption continuum. The gray absorption continuum has weak and almost linear spectral dependence through the near infrared and visible spectral range. It is ascribed to carbon nanoclusters which may form in plasma and get trapped into growing diamond. It is suggested that Mie light scattering on the carbon nanoclusters substantially contributes to the gray absorption continuum and determines its weak spectral dependence. A Raman line at a wavenumber of 1550 cm-1 is described as a characteristic feature of the carbon nanoclusters. The striation pattern of brown/gray color follows the pattern of anomalous birefringence suggesting that the vacancy clusters and carbon inclusions are the main cause of internal stress in CVD diamond. A conclusion is made that high perfection of seed surface at microscale is not a required condition for growth of low-stress, low-inclusion single crystal CVD diamond. Crystallographic order at macroscale is more important requirement for the seed surface.
DS200912-0846
2009
Zaitsev, A.A.N.A.Zaitsev, A.A.N.A., Keller, J.A., Billstram, K.A.Isotopic composition of Sr, Nd and Pb in pissonite, shortite and calcite carbonatites from Oldoinyo Lengai volcano, Tanzania.Doklady Earth Sciences, Vol. 425, 2, pp. 302-306.Africa, TanzaniaCarbonatite
DS1983-0645
1983
Zaitsev, A.I.Zaitsev, A.I., Nenashev, N.I., Nikishov, K.N.Rubidium-strontium Isotope Geochemistry of Serpentinites from Kimberlite rocks of Yakutia.Soviet Geology And Geophysics, Vol. 24, No. 1, PP. 80-84.Russia, YakutiaGeochemistry, Geochronology, Rubidium-strontium
DS1987-0185
1987
Zaitsev, A.I.Entin, A.R., Zaitsev, A.I., Nenahev, N.I., Olshtynskii, S.P.Mineralogical geochemical indicators of the formation conditions of apatiteDoklady Academy of Sciences Akademy Nauk SSSR (Russian), Vol. 294, No. 5, pp. 1217-1220RussiaApatite, Carbonatite
DS1990-0452
1990
Zaitsev, A.I.Entin, A.R., Zaitsev, A.I., Nenshev, N.I., Vasilenko, V.B., OrlovSequence of geological events related to the intrusion of the Tomtor massifSoviet Geology and Geophysics, Vol. 31, no, 12, pp. 39-47RussiaCarbonatite, Tomtor
DS1990-1291
1990
Zaitsev, A.I.Safronov, A.F., Suvorov, V.D., Zaitsev, A.I.Indications of kimberlite magmatism in the crust and the upper mantle ofYakutia.(Russian)Doklady Academy of Sciences Nauk USSR*(in Russian), Vol. 312, No. 5, pp. 1204-1206RussiaMantle, Kimberlite magma
DS1991-0444
1991
Zaitsev, A.I.Entin, A.R., Biryukov, V.M., Zaitsev, A.I., Nenashev, N.I., et al.Age of ultrabasic alkaline rocks and carbonatites of the Gornoozyorskii and Povorotny massifsSoviet Geology and Geophysics, Vol. 32, No. 7, pp. 47-55RussiaCarbonatite, Geochronology
DS1994-1514
1994
Zaitsev, A.I.Safrinov, A.F., Suvonov, V.D., Zaitsev, A.I., Nenashev, N.I.The kimberlite controlling zones in the uppermost mantle of west YakutiaProceedings of Fifth International Kimberlite Conference, Vol. 1, pp. 172-176.Russia, YakutiaStructure, Kimberlite
DS1995-0199
1995
Zaitsev, A.I.Brakhfogel, F.F., Zaitsev, A.I., Nenashev, N.I.Isotopic dating of kimberlite and related rocks in the N-E the SiberianPlatformProceedings of the Sixth International Kimberlite Conference Extended Abstracts, p. 63-65.Russia, YakutiaGeochronology
DS1995-2115
1995
Zaitsev, A.I.Zaitsev, A.I., Safronov, A.F., Brakfogel, F.F.Rubidium strontium isotope geochemistry of kimberlites and deep seated xenoliths of the Kharamai field.Proceedings of the Sixth International Kimberlite Conference Abstracts, pp. 678-679.Russia, Siberia, AnabarGeochemistry, Deposit -Kharamai region
DS1998-1320
1998
Zaitsev, A.I.Shamshina, E.A., Zaitsev, A.I.New age of Yakutian kimberlites7th. Kimberlite Conference abstract, pp. 783-4.Russia, YakutiaGeochronology
DS2003-1295
2003
Zaitsev, A.I.Smelov, A.P., Timofeev, V.F., Zaitsev, A.I.A geodynamic model for the formation of the north Asian craton in the Early8 Ikc Www.venuewest.com/8ikc/program.htm, Session 9, POSTER abstractChina, AsiaTectonics
DS200412-1855
2003
Zaitsev, A.I.Smelov, A.P., Timofeev, V.F., Zaitsev, A.I.A geodynamic model for the formation of the north Asian craton in the Early Precambrian.8 IKC Program, Session 9, POSTER abstractChina, AsiaCraton studies Tectonics
DS201312-0835
2013
Zaitsev, A.I.Smelov, A.P., Zaitsev, A.I.The age and localization of kimberlite magmatism in the Yakutian kimberlite Province: constraints from isotope geochronology - an overview.Proceedings of the 10th. International Kimberlite Conference, Vol. 1, Special Issue of the Journal of the Geological Society of India,, Vol. 1, pp. 225-234.Russia, YakutiaGeochronology
DS1985-0674
1985
Zaitsev, A.M.Tkachev, V.D., Zaitsev, A.M., Tkachev, V.V.The Matrix Pressure Effect and Optical Activity of Inert Gases in Diamond.Doklady Academy of Sciences Nauk BSSR., Vol. 29, No. 5, PP. 412-414.RussiaCrystallography
DS2001-1288
2001
Zaitsev, A.M.Zaitsev, A.M.Optical properties of diamond. A dat a HandbookSpringer Verlag, ISBN 3-540-66582-x, 480p.GlobalRefraction, reflection, absorption, scattering, color, Classification - physical, luminescence
DS200712-0234
2006
Zaitsev, A.M.Deljanin, B., Simic, D., Epeloym, M., Zaitsev, A.M.Study of fancy color and near colorless HPHT grown synthetic diamonds from advanced optical technology Co. Canada.Gems & Gemology, 4th International Symposium abstracts, Fall 2006, p.154-5. abstract onlyTechnologySynthetic diamonds
DS200912-0847
2008
Zaitsev, A.M.Zaitsev, A.M.On the way to mass scale production of perfect bulk diamonds.Proceedings of National Academy of Sciences USA, Vol. 105, 46, 17591-2.TechnologyDiamond production
DS201012-0214
2010
Zaitsev, A.M.Gaillou, E., Post, J.E., Bassim, N.D., Zaitsev, A.M., Rose, T., Fries, M.D., Stroud, R.M., Steele, A., Butler, J.E.Spectroscopic and microscopic characterizations of color laminae in natural pink diamonds.Diamond and Related Materials, Vol. 19, 10, pp. 1207-1220.TechnologySpectroscopy
DS201312-0637
2013
Zaitsev, A.M.Nasdala, L., Grambole, D., Wildner, M., Gigler, A.M., Hainschwang, T., Zaitsev, A.M., Harris, J.W., Milledge, J., Schulze, D.J., Hofmeister, W., Balmer, W.A.Radio-colouration of diamond: a spectroscopic study.Contributions to Mineralogy and Petrology, Vol. 165, pp. 843-861.Africa, South Africa, Democratic Republic of Congo, South America, Brazil, VenezuelaDiamond - colour
DS201412-0196
2013
Zaitsev, A.M.Dobrinets, I.A., Vins, V.G., Zaitsev, A.M.HPHT-treated diamonds: diamonds forever.Springer, 257p. Approx $ 140.TechnologyBook
DS201608-1414
2016
Zaitsev, A.M.Johnson, P., Moe, K.S., Zaitsev, A.M.Treated hydrogen rich diamonds.GSA Annual Meeting, Abstract, Poster 1p.TechnologyBlack diamond

Abstract: Black diamonds with poor transparency due to an intensity of mineral inclusions and fractures are routinely traded in the gem market today. Although the inclusions and fractures are of natural origin this type of diamond is often heated to create a more uniform black color by further graphitizing these inclusions and fractures. Graphitization is often prominent at these fractures resulting in poor quality heavily fractured material. After nitrogen hydrogen is the most common impurity in natural diamond and is often responsible for a gem quality diamonds color. Color in diamond related or attributed to the hydrogen impurity can range from brown to green and gray. These colors are often undesirable to the gem trade and consumers. Recently GIA laboratories have seen a lot of faceted “Black” diamonds (graded as Fancy Black on GIA’s color scale) for identification. These diamonds are hydrogen rich and it is suspected that this material is treated (heated). Probably unattractive grayish green brown material that is virtually worthless in the gem trade before treatment. With such large quantities of this treated material available a serious threat and identification problem is posed to the Gem Diamond industry. Three faceted round cut hydrogen rich diamonds (0.30, 0.52 and 0.58 carats) colored by dense hydrogen clouds giving them a murky grayish appearance have been documented and systematically heated. A black color identical to that of the suspected treated black diamonds has been achieved, thus confirming this coloration treatment and new identification techniques to detect it. These treated black diamonds have a uniform color and lack the heavy fracturing and surface graphitization of typical treated black diamonds. Heating conditions and techniques will be discussed and we report on this new type of material and gem stone treatment.
DS201610-1876
2016
Zaitsev, A.M.Johnson, P., Kyaw, S., Zaitsev, A.M.Treated hydrogen rich diamonds.GSA Annual Meeting, 1/2p. abstractTechnologyBlack diamond
DS201702-0212
2017
Zaitsev, A.M.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
Zaitsev, A.M.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.
DS201809-2118
2018
Zaitsev, A.M.Zaitsev, A.M., Moe, K., Wang, W.Defect transformations in nitrogen doped CVD diamond during irradiation and annealing.Diamond and Related Materials, doi:101016/j.diamond.2018.07.017Russiasynthetics

Abstract: Nitrogen-doped CVD diamond treated with electron irradiation and subsequent annealing at temperatures from 860 to 1900?°C was studied using fluorescence imaging, optical absorption and photoluminescence. It was found that nitrogen impurity produces many optical centers active throughout the infrared and visible spectral ranges. The most prominent of them active in IR spectral range are the centers related to nitrogen-hydrogen complexes. They produce absorption lines at 2827, 2874, 2906, 2949, 2990, 3031, 3107, 3123 and 3310?cm-1. Two characteristic absorptions at wavenumbers 1293?cm-1 and 1341?cm-1 were tentatively ascribed to a modified form of nitrogen A-aggregates. In the visible and near IR spectral ranges, characteristic nitrogen-related centers have zero-phonon lines (ZPLs) at 457, 462, 489, 498, 722.5, 852.5, 865.5, 868.5, 908, 921.5 and 924.5?nm. Some of them, e.g. 457, 462 and 498?nm centers, are unique of CVD diamond. It has been confirmed that the brightest pink color of electron-irradiated nitrogen-doped CVD diamond is produced by annealing at temperatures about 1000?°C. Annealing at temperatures over 1600?°C destroys the irradiation-induced pink color. It was found that the center 489?nm is a major absorption feature in the visible spectral range of electron-irradiated, nitrogen-doped CVD diamond. Green color of electron-irradiated, nitrogen-doped CVD diamond is caused by combined absorption of GR1 center and 489?nm center. It has been confirmed that NV defects produced in CVD diamond during growth are very temperature stable. They survive heating at temperatures at least 2000?°C. In contrast, NV defects produced by irradiation may anneal out at temperatures as low as 1600?°C. This much lower thermal stability of the radiation-induced NV defects is the result of their interaction with other radiation defects produced in their vicinity. A conclusion has been made that in nitrogen-doped CVD diamonds nitrogen atoms may form clusters. These clusters are probably the origin of the broad band luminescence at wavelengths 360, 390, 535 and 720?nm and a strong broadening of ZPLs of many optical centers.
DS201812-2829
2018
Zaitsev, A.M.Kazuchits, N.M., Rusetsky, M.S., Kazuchits, V.N., Korolovic, O.V., Kumar, V., Moe, K.S., Wang, W., Zaitsev, A.M. Comparison of HPHT and LPHT annealing of Ib synthetic diamond.Diamond & Related Materials, doi.1016/j.diamond.2018.11.018 30p. Russiasynthetics

Abstract: Defect transformations in type Ib synthetic diamond annealed at a temperature of 1870?°C under stabilizing pressure (HPHT annealing) and in hydrogen atmosphere at normal pressure (LPHT annealing) are compared. Spectroscopic data obtained on the samples before and after annealing prove that the processes of nitrogen aggregation and formation of nitrogen-nickel complexes are similar in both cases. Essential differences between HPHT and LPHT annealing are stronger graphitization at macroscopic imperfections and enhanced lattice distortions around point defects in the latter case. The lattice distortion around point defects is revealed as a considerable broadening of zero-phonon lines of “soft” (vacancy-related) optical centers. It was found that LPHT annealing may enhance overall intensity of luminescence of HPHT-grown synthetic diamonds.
DS201901-0094
2018
Zaitsev, A.M.Zaitsev, A.M., Moe, K.S., Wang, W.Nitrogen in CVD-grown diamond.Gems & Gemology, Sixth International Gemological Symposium Vol. 54, 3, 1p. Abstract p. 304-5.Globalsynthetics

Abstract: In diamond grown by the CVD method, nitrogen behaves differently than it does in natural and HPHT-grown diamond. The most striking peculiarities are low efficiency of doping, formation of unique optical centers over a wide spectral range from the ultraviolet (UV) to the IR regions, and formation of unusual defects related to aggregated nitrogen. In order to gain a better insight into this problem, several nitrogen-doped specimens grown in GIA’s CVD diamond lab and a few commercial yellow CVD-grown diamonds have been studied in their as-grown (asreceived) state and after electron irradiation and annealing at temperatures up to 1900°C (low-pressure, high-temperature treatment). We found that the brightest pink color of electron-irradiated nitrogen-doped CVD-grown diamond is produced by the NV– center after annealing at temperatures of about 1000°C. Annealing at temperatures over 1600°C destroys the irradiation-induced pink color (figure 1). The most prominent optical centers in the IR spectral region (figure 2, left) produced absorptions at 2828, 2874, 2906, 2949, 3031, 3107, 3123, and 3310 cm–1 (latter two not shown). These are ascribed to nitrogen-hydrogen complexes. Two characteristic absorption features at 1293 and 1341 cm–1 (figure 2, right) are unique to CVD diamond. They are tentatively ascribed to a modified form of nitrogen A-aggregates. In the visible and NIR spectral ranges, characteristic nitrogenrelated centers have zero-phonon lines (ZPLs) at 457, 462, 489, 498, 647, 722.5, 852.5, 865.5, 868.5, 908, 921.5, and 924.5 nm. The 489 nm feature is a major color center of electron-irradiated, nitrogen-doped CVD-grown diamond. This center, together with the GR1 center, is responsible for the green color in this material. An assumption is made that N atoms may form clusters in highly nitrogen-doped CVD-grown diamonds. These clusters may result in broad-band luminescence at wavelengths of 360, 390, 535, and 720 nm and a strong broadening of the ZPLs of many optical centers
DS202006-0961
2020
Zaitsev, A.M.Zaitsev, A.M., Kazuchits, N.M., Kazuchits, V.N., Moe, K.S., Rusetsky, M.S., Korolik, O.V., Kitajima, K., Butler, J.E., Wang, W.Nitrogen-doped CVD diamond: nitrogen concentration, color and internal stress.Diamonds & Related Materials, Vol. 105, 13p. pdfMantlenitrogen

Abstract: Single crystal CVD diamond has been grown on (100)-oriented CVD diamond seed in six layers to a total thickness of 4.3 mm, each layer being grown in gas with increasing concentration of nitrogen. The nitrogen doping efficiency, distribution of color and internal stress have been studied by SIMS, optical absorption, Raman spectroscopy and birefringence imaging. It is shown that nitrogen doping is very non-uniform. This non-uniformity is explained by the terraced growth of CVD diamond. The color of the nitrogen-doped diamond is grayish-brown with color intensity gradually increasing with nitrogen concentration. The absorption spectra are analyzed in terms of two continua representing brown and gray color components. The brown absorption continuum exponentially rises towards short wavelength. Its intensity correlates with the concentration of nitrogen C-defects. Small vacancy clusters are discussed as the defects responsible for the brown absorption continuum. The gray absorption continuum has weak and almost linear spectral dependence through the near infrared and visible spectral range. It is ascribed to carbon nanoclusters which may form in plasma and get trapped into growing diamond. It is suggested that Mie light scattering on the carbon nanoclusters substantially contributes to the gray absorption continuum and determines its weak spectral dependence. A Raman line at a wavenumber of 1550 cm-1 is described as a characteristic feature of the carbon nanoclusters. The striation pattern of brown/gray color follows the pattern of anomalous birefringence suggesting that the vacancy clusters and carbon inclusions are the main cause of internal stress in CVD diamond. A conclusion is made that high perfection of seed surface at microscale is not a required condition for growth of low-stress, low-inclusion single crystal CVD diamond. Crystallographic order at macroscale is more important requirement for the seed surface.
DS1996-1583
1996
Zaitsev, A.N.Zaitsev, A.N.Strontium, neodymium isotopic systematics of the alkaline rare earth elements (REE) carbonates, Khbina, Russia.International Geological Congress 30th Session Beijing, Abstracts, Vol. 2, p. 382.RussiaCarbonatite, Deposit -Khbina
DS1996-1584
1996
Zaitsev, A.N.Zaitsev, A.N.Rhombohedral carbonates from carbonatites of the Khibin a Massif, KolaPeninsula, Russia.Canadian Mineralogist, Vol. 34, pt. 2, April pp. 453-468.Russia, Kola PeninsulaCarbonatite, Deposit -Khibina
DS1997-0141
1997
Zaitsev, A.N.Bulakh, A.G., Zaitsev, A.N., Le Bas, M.J., Wall, F.Ancylite bearing carbonatites of the Sevlyavr Massif, Kola PeninsulaGeological Association of Canada (GAC) Abstracts, POSTER.Russia, Kola PeninsulaCarbonatite, Deposit - Sevlyavr
DS1997-1288
1997
Zaitsev, A.N.Zaitsev, A.N., Bell, K., Wall, F., Le Bas, M.J.Alkaline rare earth element carbonates from carbonatites of the KhibinyMassif: mineralogy, genesisDoklady Academy of Sciences, Vol. 355, No. 5, Jun-July pp. 786-90.RussiaCarbonatite
DS1998-1622
1998
Zaitsev, A.N.Zaitsev, A.N., Wall, F., Le Bas, M.J.rare earth elements (REE) Strontium, Barium minerals from the Khibin a carbonatites, Kola Pen. Russia: their mineralogy, paragenesis, evolution.Mineralogical Magazine, Vol. 62, No. 2, Apr. pp. 225-250.Russia, Kola PeninsulaMineralogy, rare earths, Carbonatite
DS1999-0121
1999
Zaitsev, A.N.Chakhmouradian, A.R., Zaitsev, A.N.Calcite amphibole clinopyroxene rock from AfrikAnd a Complex: mineralogy and possible link - carbonatites 1.Canadian Mineralogist, Vol. 37, No. 1, Feb. pp. 177-98.Russia, Kola PeninsulaCarbonatite, oxide minerals
DS1999-0822
1999
Zaitsev, A.N.Zaitsev, A.N., Subbotin, V.V., et al.Niobium and Zirconium mineralization in the Sallanlatvi carbonatites, Kola Peninsula, Russia.Stanley, SGA Fifth Biennial Symposium, pp. 691-6.Russia, Kola PeninsulaCarbonatite
DS2001-1215
2001
Zaitsev, A.N.Wall, F., Zaitsev, A.N., Mariano, A.N.Rare earth pegmatites in carbonatitesJournal of South African Earth Sciences, Vol. 32, No. 1, p. A 35-6.(abs)GlobalCarbonatite, Pegmatites - rare earth elements (REE).
DS2002-0268
2002
Zaitsev, A.N.Chakhmouradian, A.R., Zaitsev, A.N.A mineralogical inquiry into the past of unique multistage carbonatites from the AfrikAnd a alkali ultramafic complex, northwestern Russia.18th. International Mineralogical Association Sept. 1-6, Edinburgh, abstract p.245.RussiaCarbonatite
DS2002-0269
2002
Zaitsev, A.N.Chakhmouradian, A.R., Zaitsev, A.N.Calcite amphibole clinopyroxene rock from th Afrikande Complex, Kola Peninsula: mineralogy and a possible link to carbonatites. III silicate minerals.Canadian Mineralogist, Vol. 40,5,Oct. pp. 1347-74.Russia, Kola PeninsulaCarbonatite - mineralogy, Afrikande Complex
DS2002-0372
2002
Zaitsev, A.N.Demeny, A., Zaitsev, A.N., Wall, F., Sindem, S., Sitnikova, M.A., KarchevskyCarbon and isotope compositions of carbonatite complexes from the Kola Peninsula, Russia.18th. International Mineralogical Association Sept. 1-6, Edinburgh, abstract p.252.Russia, Kola PeninsulaCarbonatite - mineralogy
DS2002-1499
2002
Zaitsev, A.N.Sitnikova, M.A., Wall, F., Jeffries, T., Zaitsev, A.N.Ancylite group minerals in the Sallaniatvi carbonatites, Kola Peninsula, Russia18th. International Mineralogical Association Sept. 1-6, Edinburgh, abstract p.251-2.Russia, Kola PeninsulaCarbonatite - mineralogy
DS2002-1768
2002
Zaitsev, A.N.Zaitsev, A.N., Chakhmouradian, A.B.Calcite amphibole clinopyroxene rock from AfrikAnd a complex: mineralogy and link carbonatitesCanadian Mineralogist, Vol.40,1,Feb.pp. 103-20.Russia, Kola PeninsulaCarbonatite - II. oxysalt minerals
DS2002-1769
2002
Zaitsev, A.N.Zaitsev, A.N., Demeny, A., Sindern, S., Wall, F.Burbankite group minerals and their alteration in rare earth carbonatites - source of elements and fluids....Lithos, Vol.62,1-2,pp.15-33., Vol.62,1-2,pp.15-33.Russia, Kola PeninsulaGeochronology, Deposit - Khibina, Vuoriyarvi complex
DS2002-1770
2002
Zaitsev, A.N.Zaitsev, A.N., Demeny, A., Sindern, S., Wall, F.Burbankite group minerals and their alteration in rare earth carbonatites - source of elements and fluids....Lithos, Vol.62,1-2,pp.15-33., Vol.62,1-2,pp.15-33.Russia, Kola PeninsulaGeochronology, Deposit - Khibina, Vuoriyarvi complex
DS200412-1840
2004
Zaitsev, A.N.Sindern, S., Zaitsev, A.N., Demeny, A., et al.Mineralogy and geochemistry of silicate dyke rocks associated with carbonatites from the Khibin a complex, Kola Russia - isotopeMineralogy and Petrology, Vol. 80, 3-4, March pp. 215-239.Russia, Kola PeninsulaCarbonatite
DS200512-0504
2003
Zaitsev, A.N.Keller, J., Zaitsev, A.N.Natrocarbonatite dykes transformed at Oldoinyo Lengai.Periodico di Mineralogia, Vol. LXX11, 1. April, pp. 125-126.Africa, TanzaniaCalcite carbonatite
DS200512-1162
2004
Zaitsev, A.N.Wall, F., Zaitsev, A.N.Phoscorites and carbonatites from mantle to mine: the key example of the Kola Alkaline Province.Mineralogical Society of Great Britain, approx $ 160.Carbonatite
DS200612-0234
2006
Zaitsev, A.N.Chakhmouradian, A.R., Zaitsev, A.N.Afrikanda: an association of ultramafic, alkaline and alkali-silica rich carbonatitic rocks from mantle derived melts.Mineralogical Society Series, Vol. 10, pp. 247-292. ingenta 1063174150MantleCarbonatite
DS200612-0676
2006
Zaitsev, A.N.Keller, J., Zaitsev, A.N.Calciocarbonatite dykes at Oldoinyo Lengai, Tanzania: the fate of natrocarbonatite.Canadian Mineralogist, Vol. 44, 4, August pp. 857-876.Africa, TanzaniaCarbonatite
DS200612-0677
2006
Zaitsev, A.N.Keller, J., Zaitsev, A.N., Wiedenmann, D.Primary magmas at Oldoinyo Lengai: the role of olivine melilitites.Lithos, in press availableAfrica, TanzaniaCarbonatite, magmatism, geochronology
DS200612-0678
2006
Zaitsev, A.N.Keller, J., Zaitsev, A.N., Wiedenmann, D.Primary magmas at Oldoinyo Lengai: the role of olivine melilites.Lithos, In press available,Africa, TanzaniaCarbonatite, natrocarbonatite, mineralogy
DS200612-1503
2004
Zaitsev, A.N.Wall, 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
DS200612-1583
2006
Zaitsev, A.N.Zaitsev, A.N., Keller, J.Mineralogical and chemical transformation of Oldoinyo Lengai natrocarbonatites, Tanzania.Lithos, in press availableAfrica, TanzaniaCarbonatite, alteration, geothermometry
DS200712-0882
2007
Zaitsev, A.N.Reguir, E., Halden, N., Chakmouradian, A., Yang, P., Zaitsev, A.N.Contrasting evolutionary trends in magnetite from carbonatites and alkaline silicate rocks.Plates, Plumes, and Paradigms, 1p. abstract p. A826.Africa, TanzaniaCarbonatite
DS200712-1216
2007
Zaitsev, A.N.Zaitsev, A.N., Jones, G.C.Mineralogical and geochemical changes in natrocarbonatites due to fumarolic activity at Oldoinyo volcano, Tanzania.Frontiers in Mineral Sciences 2007, Joint Meeting of Mineralogical societies Held June 26-28, Cambridge, Abstract Volume p. 240.Africa, TanzaniaCarbonatite
DS200712-1217
2007
Zaitsev, A.N.Zaitsev, A.N., Jones, G.C.Mineralogical and geochemical changes in natrocarbonatites due to fumarolic activity at Oldoinyo volcano, Tanzania.Frontiers in Mineral Sciences 2007, Joint Meeting of Mineralogical societies Held June 26-28, Cambridge, Abstract Volume p. 240.Africa, TanzaniaCarbonatite
DS200812-0947
2008
Zaitsev, A.N.Reguir, E.P., Chakhmouradian, A.R., Halden, N.M., Yang, P., Zaitsev, A.N.Early magmatic and reaction induced trends in magnetite from the carbonatites of Kerimasi, Tanzania.Canadian Mineralogist, Vol. 46, 4, August pp.Africa, TanzaniaCarbonatite
DS200812-1305
2008
Zaitsev, A.N.Zaitsev, A.N., Keller, J., Spratt, J., Perova, E.N., Kearlsey, A.Nyereite pissonite calcite shortite relationships in altered natrocarbonatites, Oldoinyo Lengai, Tanzania.Canadian Mineralogist, Vol. 46, 4, August pp.Africa, TanzaniaCarbonatite
DS200912-0813
2009
Zaitsev, A.N.Wiedenmann, D., Keller, J., Zaitsev, A.N.Occurrence and compositional variation of high Na Al melilites at Oldoinyo Lengai, Tanzania.alkaline09.narod.ru ENGLISH, May 10, 2p. abstractAfrica, TanzaniaCarbonatite
DS200912-0848
2009
Zaitsev, A.N.Zaitsev, A.N., Keller, J., Jones, G., Grassineau, N.Mineralogical and geochemical changes of natrocarbonatites due to fumarolic activity at Oldoinyo Lengai volcano, Tanzania.alkaline09.narod.ru ENGLISH, May 10, 2p. abstractAfrica, TanzaniaCarbonatite
DS201012-0847
2010
Zaitsev, A.N.Wiedenmann, D., Keller, J., Zaitsev, A.N.Melilite group minerals at Oldoinyo Lengai, Tanzania.Lithos, in press available not formatted 23p.Africa, TanzaniaCarbonatite
DS201112-0112
2011
Zaitsev, A.N.Britvin, S.N., Zaitsev, A.N.Layered sodium manganese phosphate from carbonatite lavas of Oldoinyo Lengai, Gregory Rift, Tanzania.Peralk-Carb 2011, workshop held Tubingen Germany June 16-18, PosterAfrica, TanzaniaCarbonatite
DS201112-0781
2011
Zaitsev, A.N.Perova, E.N., Zaitsev, A.N.Thermodynamic analysis of the stability of secondary minerals in altered carbonatites from Oldoinyo Lengai, northern Tanzania.Peralk-Carb 2011, workshop held Tubingen Germany June 16-18, PosterAfrica, TanzaniaCarbonatite
DS201112-0782
2011
Zaitsev, A.N.Perova, E.N., Zaitsev, A.N.Thermodynamic analysis of the stability of secondary minerals in altered carbonatites from Oldoinyo Lengai, northern Tanzania.Peralk-Carb 2011... workshop June 16-18, Tubingen, Germany, Abstract p.109-110.Africa, TanzaniaOldoinyo Lengai
DS201112-0783
2011
Zaitsev, A.N.Perova, E.N., Zaitsev, A.N.Thermodynamic analysis of the stability of secondary minerals in altered carbonatites from Oldoinyo Lengai, northern Tanzania.Peralk-Carb 2011... workshop June 16-18, Tubingen, Germany, Abstract p.109-110.Africa, TanzaniaOldoinyo Lengai
DS201112-0789
2011
Zaitsev, A.N.Petrov, S.V., Antonov, A.V., Golovina, T.A., Zaitsev, A.N.Mineralogy of heavy minerals concentrates from the unconsolidated deposits of Eledoi and Pello Hill volcanic cones ( Gelai volcano): first preliminary dataPeralk-Carb 2011, workshop held Tubingen Germany June 16-18, PosterAfrica, TanzaniaAlkalic
DS201112-0790
2011
Zaitsev, A.N.Petrov, S.V., Antonov, A.V., Golovina, T.A., Zaitsev, A.N.Mineralogy of heavy minerals concentrates from the unconsolidated deposits of Eeldoi and Pello Hill volcanic cones (Gelai volcano, northern Tanzania) prel.Peralk-Carb 2011... workshop June 16-18, Tubingen, Germany, Abstract p.111-112.Africa, TanzaniaDiamond, pyrope
DS201112-0791
2011
Zaitsev, A.N.Petrov, S.V., Antonov, A.V., Golovina, T.A., Zaitsev, A.N.Mineralogy of heavy minerals concentrates from the unconsolidated deposits of Eeldoi and Pello Hill volcanic cones (Gelai volcano, northern Tanzania) prel.Peralk-Carb 2011... workshop June 16-18, Tubingen, Germany, Abstract p.111-112.Africa, TanzaniaDiamond, pyrope
DS201112-0958
2011
Zaitsev, A.N.Siidra, O.I., Spratt, J., Demeny, A., Homonnay, Z., Markl, G., Zaitsev, A.N.Cation distribution in the crystal structure of a new amphibole group mineral from the Deeti volcanic cone, northern Tanzania.Peralk-Carb 2011, workshop held Tubingen Germany June 16-18, PosterAfrica, TanzaniaAlkalic
DS201112-1148
2011
Zaitsev, A.N.Zaitsev, A.N., Sharygin, V.V., Kamenetsky, V.S., Kamenetsky, M.B.Silicate-carbonate liquid immiscibility in 1917 eruption nephelinite lavas, Oldoinyo Lengai volcano, Tanzania: melt inclusion study.Peralk-Carb 2011... workshop June 16-18, Tubingen, Germany, Abstract p.164-166.Africa, TanzaniaOldoinyo Lengai
DS201112-1149
2011
Zaitsev, A.N.Zaitsev, A.N., Sharygin, V.V., Kamenetsky, V.S., Kamenetsky, M.B.Silicate-carbonate liquid immiscibility in 1917 eruption nephelinite lavas, Oldoinyo Lengai volcano, Tanzania: melt inclusion study.Peralk-Carb 2011... workshop June 16-18, Tubingen, Germany, Abstract p.164-166.Africa, TanzaniaOldoinyo Lengai
DS201112-1150
2011
Zaitsev, A.N.Zaitsev, A.N., Sharygin, V.V., Sobolev, V.S., Kamenetsky, V.S., Kamenetsky, M.B.Silicate carbonate liquid immiscibility in 1917 eruption nephelinite lavas, Oldoinyo Lengai volcano, Tanzania: melt inclusion study.Peralk-Carb 2011, workshop held Tubingen Germany June 16-18, PosterAfrica, TanzaniaCarbonatite
DS201112-1151
2011
Zaitsev, A.N.Zaitsev, A.N., Wenzel, T., Markl, G.Natrocarbonatites at Sadiman and Tinderent volcanoes, East African Rift - myth or reality?Peralk-Carb 2011... workshop June 16-18, Tubingen, Germany, Abstract p.161-163.Africa, KenyaCarbonatite
DS201112-1152
2011
Zaitsev, A.N.Zaitsev, A.N., Wenzel, T., Markl, G.Natrocarbonatites at Sadiman and Tinderent volcanoes, East African Rift - myth or reality?Peralk-Carb 2011... workshop June 16-18, Tubingen, Germany, Abstract p.161-163.Africa, KenyaCarbonatite
DS201201-0861
2011
Zaitsev, A.N.Zaitsev, A.N., Chakmouradian, A.R., Sidra, O.I., Spratt, J., Williams, Stanley, Petrov, Britvin, PolyakaFlourine , yttrium and lanthaide rich cerianite (Ce) from carbonatitic rocks of the Kerimasi volcano and surrounding explosive craters Gregory Rift Tanzania.Mineralogical Magazine, Vol. 75, 6, pp. 2813-2822.Africa, TanzaniaCarbonatite
DS201212-0117
2012
Zaitsev, A.N.Chakhmouradian, A.R., Zaitsev, A.N.Rare earth mineralization in igneous rocks: sources and processes.Elements, Vol. 8, 5, Oct. pp. 347-353.Global, RussiaMineralogy, REE, deposits, carbonatites
DS201212-0351
2012
Zaitsev, A.N.Keller, J., Zaitsev, A.N.Geochemistry and petrogenetic significance of natrocarbonatites at Oldoinyo Lengai, Tanzania: composition of lavas from 1988-2007.Lithos, Vol. 148, pp. 45-53.Africa, TanzaniaCarbonatite
DS201212-0352
2012
Zaitsev, A.N.Keller, J., Zaitsev, A.N.Reprint of Geochemistry and petrogenetic significance of natrocarbonattes at Oldoinyo-Lengai, Tanzania: composition of lavas from 1988-2007.Lithos, Vol. 152, pp. 47-55.Africa, TanzaniaDeposit - Oldoinyo-Lengai
DS201212-0639
2012
Zaitsev, A.N.Sharygin, V.V., Kamenetsky, V.S., Zaitsev, A.N., Kamenetsky, M.B.Silicate-natrocarbonatite liquid immiscibility in 1917 eruption combeite-wollastonite nephelinite, Oldoinyo Lengai volcano, Tanzania: melt inclusion study.Lithos, Vol. 152, pp. 23-39.Africa, TanzaniaDeposit - Oldoinyo-Lengai
DS201212-0810
2012
Zaitsev, A.N.Zaitsev, A.N., Marks, M.A.W., Wenzel, T., Spratt, W.J., Sharygin, V.V., Strekoptov, G.M.Mineralogy, geochemistry and petrology of the phonolitic to nephelinitic Sadiman volcano, Crater Highlands, Tanzania.Lithos, Vol. 152, pp. 66-83.Africa, TanzaniaNephelinite
DS201312-0799
2013
Zaitsev, A.N.Sekisova, V.S., Sharygin, V.V., Zaitsev, A.N.Silicate natrocarbonate immisicibility in ijolites at Oldoinyo Lengai Tanzania: melt inclusion study.Goldschmidt 2013, 1p. AbstractAfrica, TanzaniaIjolite
DS201312-1003
2013
Zaitsev, A.N.Zaitsev, A.N., Kamenetsky, V.S.Magnetite hosted melt inclusions from phoscorites and carbonatites ( Kovdor, Kola): a hydrous analog of Oldoinyo Lengai natrocarbonatites?Goldschmidt 2013, 1p. AbstractRussia, Kola Peninsula, Africa, TanzaniaCarbonatite
DS201312-1004
2013
Zaitsev, A.N.Zaitsev, A.N., Wenzel, T., Vennemann, T., Markl, G.Tinderet volcano, Kenya: an altered natrocarbonatite locality?Mineralogical Magazine, Vol. 77, 3, pp. 213-226.Africa, KenyaCarbonatite
DS201412-0545
2014
Zaitsev, A.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
DS201412-1015
2014
Zaitsev, A.N.Zaitsev, A.N., Williams, C.T., Jeffreis, T.E., Strekopytov, S., Moutte, J., Ivashchenkova, O.V., Spratt, J., Petrov, S.V., Wall, F., Seltmann, R., Borozdin, A.P.Rare earth elements in phoscorites and carbonatites of the Devonian Kola alkaline province, Russia: examples from Kovdor, Khibina, Vuoriyarvi and Turiy Mys complexes.Ore Geology Reviews, Vol. 64, pp. 204-225.Russia, Kola PeninsulaCarbonatite
DS201412-1017
2014
Zaitsev, A.N.Zaitsev, A.N., Williams, C.T., Jeffries, T.E., Strekopytov, S., Moutte, J., Ivashchenkova, O.V., Spratt, J., Petrov, S.V., Wall, F., Seltmann, R., Borozdin, A.P.Rare earth elements in phoscorites and carbonatites of the Devonian Kola alkaline province, Russia: examples from Kovdor, Khibina, Vuoriyarvi and Turiy Mys complexes.Ore Geology Reviews, Vol. 61, pp. 204-225.Russia, Kola PeninsulaCarbonatite
DS201412-1019
2014
Zaitsev, A.N.Zaitsev, A.N., Williams, C.T., Jeffries, T.E., Strekopytov, S., Moutte, J., Ivashchenkova, O.V., Spratt, J., Petrov, S.V., Wall, F., Seltmann, R., Borozdin, A.P.Rare earth elements in phoscorites and carbonatites of the Devonian Kola alkaline province, Russia: examples from Kovdor, Khibina, Vuoriyarvi and Turiy Mys complexes.Ore Geology Reviews, in press availableRussia, Kola PeninsulaCarbonatite
DS201506-0256
2015
Zaitsev, A.N.Bell, K., Zaitsev, A.N., Spratt, J., Frojdo, S., Rukhlov, A.S.Elemental, lead and sulfur isotopic compositions of galena from Kola carbonatites, Russia - implications for melt and mantle evolution.Mineralogical Magazine, Vol. 79, 2, pp. 219-241.RussiaCarbonatite, Kola

Abstract: Galena from four REE-rich (Khibina, Sallanlatvi, Seblyavr, Vuoriyarvi) and REE-poor (Kovdor) carbonatites, as well as hydrothermal veins (Khibina) all from the Devonian Kola Alkaline Province of northwestern Russia was analysed for trace elements and Pb and S isotope compositions. Microprobe analyses show that the only detectable elements in galena are Bi and Ag and these vary from not detectable to 2.23 and not detectable to 0.43 wt.% respectively. Three distinct galena groups can be recognized using Bi and Ag contents, which differ from groupings based on Pb isotope data. The Pb isotope ratios show significant spread with 206Pb/204Pb ratios (16.79 to 18.99), 207Pb/204Pb (15.22 to 15.58) and 208Pb/204Pb ratios (36.75 to 38.62). A near-linear array in a 207Pb/204Pb vs. 206Pb/204Pb ratio diagram is consistent with mixing between distinct mantle sources, one of which formed during a major differentiation event in the late Archaean or earlier. The S isotopic composition (d34S) of galena from carbonatites is significantly lighter (–-6.7 to -–10.3% Canyon Diablo Troilite (CDT) from REE-rich Khibina, Seblyavr and Vuoriyarvi carbonatites, and - 3.2% CDT from REE-poor Kovdor carbonatites) than the mantle value of 0%. Although there is no correlation between S and any of the Pb isotope ratios, Bi and Ag abundances correlate negatively with d34S values. The variations in the isotopic composition of Pb are attributed to partial melting of an isotopically heterogeneous mantle source, while those of d34S (together with Bi and Ag abundances) are considered to be process driven. Although variation in Pb isotope values between complexes might reflect different degrees of interaction between carbonatitic melts and continental crust or metasomatized lithosphere, the published noble gas and C, O, Sr, Nd and Hf isotopic data suggest that the variable Pb isotope ratios are best attributed to isotopic differences preserved within a sub-lithospheric mantle source. Different Pb isotopic compositions of galena from the same complex are consistent with a model of magma replenishment by carbonatitic melts/fluids each marked by quite different Pb isotopic compositions.
DS201508-0345
2015
Zaitsev, A.N.Chakhmouradian, A.R., Reguir, E.P., Zaitsev, A.N.Calcite and dolomite in intrusive carbonatites. I Textural variastions.Mineralogy and Petrology, in press available 28p.GlobalCarbonatite

Abstract: Carbonatites are nominally igneous rocks, whose evolution commonly involves also a variety of postmagmatic processes, including exsolution, subsolidus re-equilibration of igneous mineral assemblages with fluids of different provenance, hydrothermal crystallization, recrystallization and tectonic mobilization. Petrogenetic interpretation of carbonatites and assessment of their mineral potential are impossible without understanding the textural and compositional effects of both magmatic and postmagmatic processes on the principal constituents of these rocks. In the present work, we describe the major (micro)textural characteristics of carbonatitic calcite and dolomite in the context of magma evolution, fluid-rock interaction, or deformation, and provide information on the compositional variation of these minerals and its relation to specific evolutionary processes.
DS201602-0236
2015
Zaitsev, A.N.Sekisova, V.S., Sharygin, V.V., Zaitsev, A.N., Strekopytov, S.Liquid immiscibility during crystallization of forsterite-phlogopite ijolites at Oldoinyo Lengai volcano, Tanzania: study of melt inclusions.Russian Geology and Geophysics, Vol. 56, pp. 1717-1737.Africa, TanzaniaDeposit - Oldoinyo Lengai

Abstract: The paper is concerned with study of melt inclusions in minerals of ijolite xenoliths at Oldoinyo Lengai Volcano. Melt inclusions with different phase compositions occur in forsterite macrocrysts and in diopside, nepheline, fluorapatite, Ti-andradite, and Ti-magnetite crystals. Nepheline contains primary melt inclusions (silicate glass + gas-carbonate globule ± submicron globules ± sulfide globule ± daughter/trapped phases, represented by diopside, fluorapatite, Ti-andradite, and alumoakermanite). The gas-carbonate globule consists of a gas bubble surrounded by a fine-grained aggregate of Na-Ca-carbonates (nyerereite and gregoryite). Fluorapatite contains primary carbonate-rich melt inclusions in the core, which consist of nyerereite, gregoryite, thenardite, witherite, fluorite, villiaumite, and other phases. Their mineral composition is similar to natrocarbonatites. Primary melt inclusions (glass + gas bubble ± daughter phases) are rare in diopside and Ti-andradite. Diopside and forsterite have trails of secondary carbonate-rich inclusions. Besides the above minerals, these inclusions contain halite, sylvite, neighborite, Na-Ca-phosphate, alkali sulfates, and other rare phases. In addition, diopside contains sulfide inclusions (pyrrhotite ± chalcopy- rite ± djerfisherite ± galena ± pentlandite). The chemical compositions of silicate glasses in the melt inclusions vary widely. The glasses are characterized by high Na, K, and Fe contents and low Al contents. They have high total alkali contents (16-23 wt.% Na2O + K2O) and peralkalinity index [(Na + K)/Al] ranging from 1.1 to 7.6. The carbonate-rich inclusions in the ijolite minerals are enriched in Na, P, S, and Cl. The data obtained indicate that the parental melt in the intermediate chamber was heterogeneous and contained silicate, natrocarbonate, and sulfide components during the ijolite crystallization. According to heating experiments with melt inclusions, silicate-carbonate liquid immiscibility occurred at temperature over 580 °C.
DS201702-0201
2017
Zaitsev, A.N.Chakhmouradian, A.R., Rehuir, E.P., Zaitsev, A.N., Coueslan, C., Xu, C., Kynicky, J., Hamid Mumin, A., Yang, P.Apatite in carbonatitic rocks: compositional variation, zoning, element partitioning and petrogeneitic significance.Lithos, in press available, 138p.TechnologyCarbonatite

Abstract: The Late Cretaceous (ca. 100 Ma) diamondiferous Fort à la Corne (FALC) kimberlite field in the Saskatchewan (Sask) craton, Canada, is one of the largest known kimberlite fields on Earth comprising essentially pyroclastic kimberlites. Despite its discovery more than two decades ago, petrological, geochemical and petrogenetic aspects of the kimberlites in this field are largely unknown. We present here the first detailed petrological and geochemical data combined with reconnaissance Nd isotope data on drill-hole samples of five major kimberlite bodies. Petrography of the studied samples reveals that they are loosely packed, clast-supported and variably sorted, and characterised by the presence of juvenile lapilli, crystals of olivine, xenocrystal garnet (peridotitic as well as eclogitic paragenesis) and Mg-ilmenite. Interclast material is made of serpentine, phlogopite, spinel, carbonate, perovskite and rutile. The mineral compositions, whole-rock geochemistry and Nd isotopic composition (Nd: + 0.62 to - 0.37) are indistinguishable from those known from archetypal hypabyssal kimberlites. Appreciably lower bulk-rock CaO (mostly < 5 wt%) and higher La/Sm ratios (12-15; resembling those of orangeites) are a characteristic feature of these rocks. Their geochemical composition excludes any effects of significant crustal and mantle contamination/assimilation. The fractionation trends displayed suggest a primary kimberlite melt composition indistinguishable from global estimates of primary kimberlite melt, and highlight the dominance of a kimberlite magma component in the pyroclastic variants. The lack of Nb-Ta-Ti anomalies precludes any significant role of subduction-related melts/fluids in the metasomatism of the FALC kimberlite mantle source region. Their incompatible trace elements (e.g., Nb/U) have OIB-type affinities whereas the Nd isotope composition indicates a near-chondritic to slightly depleted Nd isotope composition. The Neoproterozoic (~ 0.6-0.7 Ga) depleted mantle (TDM) Nd model ages coincide with the emplacement age (ca. 673 Ma) of the Amon kimberlite sills (Baffin Island, Rae craton, Canada) and have been related to upwelling protokimberlite melts during the break-up of the Rodinia supercontinent and its separation from Laurentia (North American cratonic shield). REE inversion modelling for the FALC kimberlites as well as for the Jericho (ca. 173 Ma) and Snap Lake (ca. 537 Ma) kimberlites from the neighbouring Slave craton, Canada, indicate all of their source regions to have been extensively depleted (~ 24%) before being subjected to metasomatic enrichment (1.3-2.2%) and subsequent small-degree partial melting. These findings are similar to those previously obtained on Mesozoic kimberlites (Kaapvaal craton, southern Africa) and Mesoproterozoic kimberlites (Dharwar craton, southern India). The striking similarity in the genesis of kimberlites emplaced over broad geological time and across different supercontinents of Laurentia, Gondwanaland and Rodinia, highlights the dominant petrogenetic role of the sub-continental lithosphere. The emplacement of the FALC kimberlites can be explained both by the extensive subduction system in western North America that was established at ca. 150 Ma as well as by far-field effects of the opening of the North Atlantic ocean during the Late Cretaceous.
DS201706-1112
2017
Zaitsev, A.N.Zaitsev, A.N., Britvin, S.N., Kearsley, A., Wenzel, T., Kirk, C.Jorgkellerite, a new layered phosphate-carbonate mineral from Oldoinyo Lengai volcano, Gregory rift, northern Tanzania.Mineralogy and Petrology, Vol. 111, 3, pp. 373-381.Africa, Tanzaniamineralogy

Abstract: Jörgkellerite, ideally Na3Mn3+ 3(PO4)2(CO3)O2•5H2O, is a new layered phosphate-carbonate from the Oldoinyo Lengai volcano in the Gregory Rift (northern Tanzania). The mineral occurs as spherulites, up to 200 µm in diameter, consisting of plates up to 10 µm in thickness in shortite-calcite and calcite carbonatites. Jörgkellerite is brown with a vitreous lustre and has a perfect micaceous cleavage on {001}, Mohs hardness is 3. The calculated density is 2.56 g/cm3. Jörgkellerite is uniaxial (-), ? = 1.700(2), ? = 1.625(2) (Na light, 589 nm) with distinct pleochroism: O = dark brown, E = light brown. The empirical formula of the mineral (average of 10 electron microprobe analyses) is (Na2.46K0.28Ca0.08Sr0.04Ba0.02)S2.88(Mn3+ 2.39Fe3+ 0.56)S2.95((PO4)1.95(SiO4)0.05))S2.00(CO3)(O1.84(OH)0.16)S2.00•5H2O. The oxidation state of Mn has been determined by XANES. Jörgkellerite is trigonal, space group P-3, a = 11.201(2) Å, c = 10.969(2) Å, V = 1191.9(7) Å3 and Z = 3. The five strongest powder-diffraction lines [d in Å, (I/I o), (hkl)] are: 10.970 (100) (001), 5.597 (15) (002), 4.993 (8) (111), 2.796 (14) (220) and 2.724 (20) (004). The crystal structure is built up of the layers composed of disordered edge-sharing [MnO6] octahedra. Each fourth Mn site in octahedral layer is vacant that results in appearance of ordered system of hexagonal "holes" occupied by (CO3) groups. The overall composition of the layer can be expressed as [Mn3O8(CO3)]. These manganese-carbonate layers are linked in the third dimension by (PO4) tetrahedra and Na-polyhedra. The origin of jörgkellerite is related to low-temperature oxidative alteration of gregoryite-nyerereite carbonatites.
DS201706-1113
2017
Zaitsev, A.N.Zaitsev, A.N., Zhitova, E.S., Spratt, J., Zolotarev, A.A., Krivovichev, S.V.Isolueshite, NaNb03, from the Kovdor carbonatite, Kola Peninsula, Russia: composition, crystal structure and possible formation scenarios.Neues Jahrbuch fur Mineralogie, Vol. 194, 2, pp. 165-173.Russia, Kola Peninsuladeposit - Kovdor

Abstract: Isolueshite, a cubic complex oxide with the formula NaNbO3, occurs as euhedral crystals 0.4 - 0.7 mm in size in calcite carbonatite, Kovdor ultrabasic-alkaline complex (Kola, Russia). Average composition of isolueshite, based on 40 analyses by wavelength-dispersive electron microprobe is (Na0.84Ca0.07Sr0.01La0.01Ce0.01)S0.95(Nb0.90Ti0.11)S1.01O3. Minor and trace elements are Ti (4.1- 6.8 wt.% TiO2), REEs (1.8 - 4.0 wt.% REE2O3), Ca (1.7- 3.3 wt.% CaO), Zr (0.1- 0.8 wt.% ZrO2), Sr (0.3 - 0.4 wt.% SrO), Th (0.1- 0.5 wt.% ThO2), Fe (0.1- 0.2 wt.% Fe2O3) and Ta (0.1 wt.% Ta2O5). The crystal structure of isolueshite was refined to an agreement index (R1) of 0.028 for 82 unique reflections with |F0| = 4 s(F). The mineral is cubic, Pm3-m, a = 3.9045(5) Å and V = 59.525(13) Å3. The diffraction pattern of the crystal contains only regular and strong Bragg reflections with no signs of diffuse scattering. There are two sites in the crystal structure: A is 12-coordinated (A-O = 2.556(3) Å) and located at the corners of the cubic primitive cell and B is situated in the center of the unit-cell and has an octahedral coordination. The crystal-chemical formula based on the structure refinement is (Na0.84(1)Ca0.16(1))(Nb0.88(1)Ti0.12(1))O3. We suggest that isolueshite is a quenched (kinetically favored) polymorph of lueshite that formed as a result of rapid crystallization due to the sudden drop in temperature and/or pressure.
DS201801-0053
2017
Zaitsev, A.N.Reguir, E.P., Chakhmouradian, A.R., Zaitsev, A.N., Yang, P.Trace element variations and zoning in phlogopite from carbonatites and phoscorites.Carbonatite-alkaline rocks and associated mineral deposits , Dec. 8-11, abstract p. 8-9.carbonatites

Abstract: Phlogopite from carbonatites and phoscorites worldwide shows three major types of core-to-rim trends of compositional variation: Ba+Al-, Fe and Fe+Al enrichment. These major-element trends are accompanied by largely consistent changes in traceelement abundances. Uptake of Rb, Sr, Ba, Sc, V, Mn and HFSE by phlogopite is susceptible to changes in the availability of these elements due to precipitation of other early silicate and oxide phases (especially, magnetite, apatite and niobates). In rare cases, more complex oscillatory and sector patterns are juxtaposed over the principal evolutionary trend, indicating kinetic and crystal-chemical controls over element uptake. Phlogopite is a common accessory to major constituent of carbonatites and genetically related rocks (including phoscorites). Major-element variations of phlogopite from these rocks have been addressed in much detail in the literature (for references, see Reguir et al. 2009), whereas its trace-element characteristics and zoning patterns have so far received little attention. In this work, we examined the compositional variation of phlogopite from 23 carbonatite and phoscorite localities worldwide. The major-element compositions were determined using wavelength-dispersive X-ray spectrometry (WDS) and trace-element abundances by laser-ablation inductively-coupled-plasma mass-spectrometry (LA-ICPMS). Previously, two major core-to-rim zoning trends have been identified in micas from calcite carbonatites (Reguir et al. 2009, 2010). Phlogopite from Oka (Canada) and Iron Hill (USA), for example, involves an increase in kinoshitalite component rim-ward, accompanied by enrichment in high-field-strength elements (HFSE = Zr, Nb, Ta), Sr and Sc. At most other carbonatite localities (e.g., Kovdor in Russia, or Prairie Lake in Canada), phlogopite crystals exhibit rim-ward enrichment in Fe. In the present work, we confirmed these two common types of zoning, and identified new patterns that have not been reported in the previous literature. In addition to the common Fe-enrichment trend, which occurs in both carbonatites (e.g., Guli in Russia and Sokli in Finland) and phoscorites (e.g., Aley in Canada), we identified a Fe-Al-enrichment subtype of this zoning pattern observed, for example, in samples from the Shiaxiondong calcite carbonatite (China). Overall, the Fe-enrichment pattern is accompanied by rim-ward depletion in Ba, Rb and HFSE, coupled with enrichment in Mn. Other trace elements exhibit no consistent variation among the studied samples. The Shiaxiondong material is characterized by the highest recorded Rb values, ranging from 1120 to 660 ppm. Phlogopite from the Kovdor calcite-forsterite-magnetite phoscorite contains the highest recorded levels of Nb and Ta, ranging from 320 ppm and 40 ppm, respectively, in the core to 85 ppm and 4 ppm in the rim. The maximum levels of Zr (up to 50 ppm) were observed in the core of Prairie Lake phlogopite, whereas its rim contains the highest measured Mn content (up to 4100 ppm). The levels of Sc are typically below 100 ppm in samples from calcite and dolomite carbonatites, but may reach 280 ppm in phoscorites. Interestingly, phlogopite from phoscorites shows rim-ward enrichment in Sc, whereas the opposite trend is observed in carbonatitic micas. Phlogopite from calcite carbonatites at Zibo (China) and Valentine Township (Canada), and from phoscorites at Aley (Canada) shows an unusual zoning pattern involving depletion in Fe, which is accompanied by a decrease in Al, Ba, Sr, Zr, Hf, Y, Sc and V abundances. The concentrations of other trace elements, including Nb and Ta show inconsistent variations. In the Aley phoscorite, phlogopite is enriched in Ba (up to 15000 ppm in the core and < 7500 ppm in the rim), but poor in Sr (80 and 35 ppm in the core and rim, respectively) relative to those from the Zibo and Valentine carbonatites. Zirconium levels reach 200 and 170 ppm in the core, and drop to < 40 and 60 ppm in the rim of the Valentine and Zibo samples, respectively. In the Aley sample, the content of Zr does not exceed 55 ppm. The Zibo sample is also enriched in V (up to 230 and 160 ppm in the core and rim, respectively) relative to the two other samples (< 100 ppm V). The Sc and Hf levels are consistently low (less than 30 and 4 ppm, respectively). In addition to simple core-rim patterns, phlogopite from carbonatites and phoscorites may exhibit oscillatory zoning, which involves periodic variations in Fe/Mg ratio. Iron-rich zones are relatively depleted in Mn, but enriched in Nb. One sample of phoscoritic phlogopite (Aley) exhibits striking sector zoning juxtaposed over the overall Feenrichment trend and Fe-Mg oscillations. In terms of major elements, basal sectors perpendicular to [001] are enriched in Fe and Al, but depleted in Mg and K relative to the flank sectors. This enrichment is accompanied by higher Ba, Sr and HFSE levels in the basal sector. Our data confirm that there is no universal pattern of zoning in carbonatitic or phoscoritic phlogopite, and variations in the content of most trace elements are strongly coupled to major-element patterns. Three major core-to-rim variation trends, as well as juxtaposed oscillatory and sector patterns, can be recognized. The observed compositional variations indicate that, in the majority of cases, the trace-element composition of phlogopite is controlled by partitioning of Rb, Sr, Ba, Sc, V, Mn and HFSE between this mineral, its parental magma, and co-precipitating early phases. Among the latter, magnetite, apatite and niobates appear to exert the greatest influence on element distributions. More complex oscillatory and sector patterns imply the presence of kinetic and crystal-chemical controls over element uptake in certain carbonatitic systems
DS201610-1914
2004
Zaitsev, A.N. .Wall, F., Zaitsev, A.N. .Phoscorites and carbonatites from mantle to mine: the key example of the Kola alkaline province.Mineralogical Society Series, isbn 0-903056-22-4 on sale approx 20lbsRussia, Kola PeninsulaBook - volcanology

Abstract: The first response to the title of this book is often 'What is a phoscorite?'. The exact definition and characteristics of phoscorite are discussed in some detail in Chapter 2 and were the subject of varying opinions amongst the authors of this and other chapters. We nicknamed the book 'the dark side of carbonatites', which covers it nicely. Phoscorites are dark, often very handsome, sometimes economically valuable, magnetite-apatite-silicate rocks, almost always associated with carbonatite. They are key to understanding the longstanding question of how carbonate and carbonate-bearing magmas rise to the crust and the Earth's surface. Despite this, they have been given little attention; a search on geological literature databases will produce thousands of references to carbonatite (up to 4125 on Georef) but not more than thirty references to phoscorite. This book goes some way to redress this balance. Over the last ten years many European and North American scientists have studied Kola rocks in collaboration with Russian colleagues. The idea for this book came from one such project funded by the European organisation, INTAS (Grant No 97-0722). The Kola Peninsula, Russia, is one of the outstanding areas in the World for the concentration and economic importance of alkaline rocks. However, Russian work on the Kola complexes is still relatively Show Less
DS201012-0883
2010
Zaitsev, N.Zaitsev, N., Williams, C.T., Britvin,S.N., Kuznetsova, I.V., Spratt, J., Petrov, S.V., Keller, J.Kerimasite Ca3ZR2(Si)O12, a new garnet from carbonatites of Kerimasi volcano and surrounding explosion craters, northern Tanzania.Mineralogical Magazine, Vol. 74, pp. 803-820.Africa, TanzaniaCarbonatite
DS201012-0884
2010
Zaitsev, V.Zaitsev, V.Graphite bearing carbonatite of Dolbykha Massif, Polar Siberia, Russia.International Mineralogical Association meeting August Budapest, AbstractRussiaCarbonatite
DS201012-0885
2010
Zaitsev, V.Zaitsev, V.Sadiman volcano, Crater Highlands, Tanzania: does it really contain melilitites and carbonatites or is it just a phonolite nephellinite volcano?International Mineralogical Association meeting August Budapest, AbstractAfrica, TanzaniaMineralogy
DS2002-1771
2002
Zaitsev, V.A.Zaitsev, V.A., Kogarko, L.N.Composition of minerals in the lamprophyllite Group from alkaline massifs worldwideGeochemistry International, Vol.40,4,pp.313-22.GlobalAlkaline rocks, Lamprophyres
DS201112-1153
2011
Zaitsev, V.A.Zaitsev, V.A.Experiments on titanosilicates ( lamprophyllite group minerals and lomonosvite) melting: phase relations and petrological significance for Lovozero massif.Peralk-Carb 2011, workshop held Tubingen Germany June 16-18, PosterRussiaMelting
DS201801-0082
2017
Zaitsev, V.A.Zaitsev, V.A.Preservation model for Kola alkaline province for Paleozoic and Paleoproterozoic alkaline magmatism volume comparing.Carbonatite-alkaline rocks and associated mineral deposits , Dec. 8-11, abstract p. 13.Russia, Kola Peninsulacarbonatites

Abstract: Northern part of the Fennoscandian Shield in Kola Peninsula and Northern Karelia was intruded by alkaline magmatic complexes during the two main episodes. Paleoproterozoic alkaline province consisting from five alkaline massifs and Paleozoic alkaline province, consisting from twenty alkaline-ultramafic rock complexes, together with two giant nepheline syenite complexes are practically overlap. Based on the data about morphology and internal structure of the Paleozoic alkaline and ultramaficcarbonatite intrusions and their average denudation rates, the model of alkaline province destruction was developed. This model allows forecasting, how many intrusions of Kola Paleozoic alkaline province will remain and calculate preservation ratio for any moment of future. The dependence of preservation ratio on the age of province allow to compare the initial numbers of massifs in alkaline provinces and conclude that Paleoproterozoic event of alkaline magmatism in Kola peninsula was even more powerful than Paleozoic one.
DS202001-0041
2019
Zaitsev, V.A.Sorokhtina, N.V., Kogarko, L.N., Zaitsev, V.A., Kononkova, N.N., Asavin, A.M.Sulfide mineralization in the carbonatites and phoscorites of the Guli Massif, Polar Siberia, and their noble metal potential.Geochemistry International, Vol. 57, 11, pp. 1125-1146.Russia, Siberiacarbonatite

Abstract: We report the first combined investigation (neutron activation, X-ray fluorescence, and electron microprobe analysis) of mineral forms of Au and Ag and noble metal distribution in the sulfide-bearing phoscorites and carbonatites of the Guli alkaline ultrabasic massif (Polar Siberia) and magnetite and sulfide separates from these rocks. The highest noble metal contents were observed in the sulfide separates from the carbonatites: up to 2.93 Pt, 61.6 Au, and 3.61 ppm Ag. Pyrrhotite, djerfisherite, chalcopyrite, and pyrite are the most abundant sulfides and the main hosts for Au and Ag. The latest assemblage of chalcopyrite, Ag-rich djerfisherite, lenaite, sternbergite, and native silver shows significant Ag concentrations. The wide occurrence of K sulfides and presence of multiphase inclusions in pyrrhotite consisting of rasvumite, K?Na–Ca carbonate, carbocernaite, strontianite, galena, chalcopyrite, sternbergite, lenaite, and native silver suggest that the sulfides were formed at high activities of K, Na, Sr, LREE, F, Cl, and S. Chlorine shows high complex-forming capacity to Ag and could be an agent of noble metal transport in the carbonatites. Crystallization of the early djerfisherite–pyrrhotite assemblages of the phoscorites and carbonatites began at a temperature not lower than 500°C and continued up to the formation of late Ag-bearing sulfides at temperatures not higher than 150°C. The carbonatite-series rocks could be enriched in Au and Ag during late low-temperature stages and serve as a source for Au placers.
DS1986-0889
1986
ZaitsevaZaitseva, GurkinaCause of color of grey and brown, probably due to crystal defects.(Russian)Mineral. Zhurn., (Russian), Vol. 8, No. 3, pp. 48-52Russiaref. Fleischer United States Geological Survey (USGS) OF 88-689.Mineralogical refs. 198, Diamond morphology
DS1986-0890
1986
Zaitseva, T.M.Zaitseva, T.M., Gurkina, G.A.Nature of grayish smoky and brownish coloration of diamondcrystals.(Russian)Mineral. Zhurn., (Russian), Vol. 8, No. 3, pp. 48-52RussiaDiamond morphology
DS2001-1289
2001
Zaitseva, T.S.Zaitseva, T.S., Goncharov, G.N., Gittsovich, SemenovCrystal chemistry of chromium spinel from Imandra Layered pluton, Kola PeninsulaGeochemistry International, Vol. 39, No. 5, pp. 479-81.Russia, Kola PeninsulaSpinels
DS201012-0886
2010
Zaitssev, A.N.Zaitssev, A.N., Wenzel, T., Markl, G., Spratt, J., Petrov, S.V., Williams, C.T.Sadiman volcano, Crater Highlands, Tanzania: does it really contain melilitites and carbonatites or is it just a phonolite nephelinite volcano?International Mineralogical Association meeting August Budapest, abstract p. 559.Africa, TanzaniaPetrology
DS201701-0039
2015
Zajac, I.S.Zajac, I.S.John Jambor's contributions to the mineralogy of the Strange Lake peralkaline complex, Quebec-Labrador, Canada.The Canadian Mineralogist, Vol. 53, pp. 885-894.Canada, LabradorRare earths

Abstract: The Strange Lake peralkaline complex is one of the world's largest deposits of yttrium, heavy rare-earth elements, and zirconium. The Precambrian intrusive body of peralkaline granitic rocks in central Labrador is extensively mineralized but mineralogically complex. It is a pleasure to acknowledge John Jambor's important contributions to the understanding of the unusual and varied mineralization. He was first to identify and characterize the potentially economic minerals: gittinsite, widespread at Strange Lake but otherwise an uncommon zirconosilicate, and the unusual acid-soluble zircon, which are the main sources of Strange Lake zirconium. He also identified the previously unknown mineral gerenite-(Y), and provided better characterization of kainosite-(Y) and of the complex gadolinite-datolite species which, collectively, account for most of the yttrium and heavy rare-earths. In all, his identification and characterization of these minerals were invaluable to understanding of the peralkaline complex, particularly the late-stage alteration that affected it and generated its economically important minerals, making them amenable to effective metallurgical processes.
DS200812-0438
2008
Zajacz, Z.Guzmics, T., Zajacz, Z., Kodoenyi, J., Halter, W., Szabo, C.LA ICP MS study of apatite and K feldspar hosted primary carbonatite melt inclusions in clinopyroxenite xenoliths from lamprophyres, Hungary: implicationsGeochimica et Cosmochimica Acta, Vol. 72, 7, pp. 1864-1886.Mantle, Europe, HungaryCarbonatite, melts
DS201503-0146
2015
Zajacz, Z.Guzmics, T., Zajacz, Z., Mitchell, R.H., Szabo, C., Walle, M.The role of liquid-liquid immiscibility and crystal fractionation in the genesis of carbonatite magmas: insights from Kerimasi melt inclusions.Contributions to Mineralogy and Petrology, Vol. 169, 18p.Africa, TanzaniaCarbonatite

Abstract: We have reconstructed the compositional evolution of the silicate and carbonate melt, and various crystalline phases in the subvolcanic reservoir of Kerimasi Volcano in the East African Rift. Trace element concentrations of silicate and carbonate melt inclusions trapped in nepheline, apatite and magnetite from plutonic afrikandite (clinopyroxene-nepheline-perovskite-magnetite-melilite rock) and calciocarbonatite (calcite-apatite-magnetite-perovskite-monticellite-phlogopite rock) show that liquid immiscibility occurred during the generation of carbonatite magmas from a CO2-rich melilite-nephelinite magma formed at relatively high temperatures (1,100 °C). This carbonatite magma is notably more calcic and less alkaline than that occurring at Oldoinyo Lengai. The CaO-rich (32-41 wt%) nature and alkali-"poor" (at least 7-10 wt% Na2O + K2O) nature of these high-temperature (>1,000 °C) carbonate melts result from strong partitioning of Ca (relative to Mg, Fe and Mn) in the immiscible carbonate and the CaO-rich nature (12-17 wt%) of its silicate parent (e.g., melilite-nephelinite). Evolution of the Kerimasi carbonate magma can result in the formation of natrocarbonatite melts with similar composition to those of Oldoinyo Lengai, but with pronounced depletion in REE and HFSE elements. We suggest that this compositional difference results from the different initial parental magmas, e.g., melilite-nephelinite at Kerimasi and a nephelinite at Oldoinyo Lengai. The difference in parental magma composition led to a significant difference in the fractionating mineral phase assemblage and the element partitioning systematics upon silicate-carbonate melt immiscibility. LA-ICP-MS analysis of coeval silicate and carbonate melt inclusions provides an opportunity to infer carbonate melt/silicate melt partition coefficients for a wide range of elements. These data show that Li, Na, Pb, Ca, Sr, Ba, B, all REE (except Sc), U, V, Nb, Ta, P, Mo, W and S are partitioned into the carbonate melt, whereas Mg, Mn, Fe, Co, Cu, Zn, Al, Sc, Ti, Hf and Zr are partitioned into the silicate melt. Potassium and Rb show no preferential partitioning. Kerimasi melt inclusions show that the immiscible calcic carbonate melt is strongly enriched in Sr, Ba, Pb, LREE, P, W, Mo and S relative to other trace elements. Comparison of our data with experimental results indicates that preferential partitioning of oxidized sulfur (as SO4 2-), Ca and P (as PO4 3-) into the carbonate melt may promote the partitioning of Nb, Ta, Pb and all REE, excluding Sc, into this phase. Therefore, it is suggested that P and S enrichment in calcic carbonate magmas promotes the genesis of REE-rich carbonatites by liquid immiscibility. Our study shows that changes in the partition coefficients of elements between minerals and the coexisting melts along the liquid line of descent are rather significant at Kerimasi. This is why, in addition to the REE, Nb, Ta and Zr are also enriched in Kerimasi calciocarbonatites. We consider significant amounts of apatite and perovskite precipitated from melilite-nephelinite-derived carbonate melt as igneous minerals can have high LREE, Nb and Zr contents relative to other carbonatite minerals.
DS201702-0244
2017
Zajacz, Z.Tsay, A., Zajacz, Z., Ulmer, P., Sanchez-Valle, C.Mobility of major and trace elements in the eclogite-fluid system and element fluxes upon slab dehydration.Geochimica et Cosmochimica Acta, Vol. 198, pp. 70-91.MantleSubduction

Abstract: The equilibrium between aqueous fluids and allanite-bearing eclogite has been investigated to constrain the effect of temperature (T) and fluid composition on the stability of allanite and on the mobility of major and trace elements during the dehydration of eclogites. The experiments were performed at 590-800 °C and 2.4-2.6 GPa, and fluids were sampled as synthetic fluid inclusions in quartz using an improved entrapment technique. The concentrations and bulk partition coefficients were determined for a range of major (Mg, Ca, Na, Fe, Al, Ti) and 16 trace elements as a function of T and fluid composition. The results reveal a significant effect of T on element partitioning between the fluids and the solid mineral assemblage. The partition coefficients increase by more than an order of magnitude for most of the major and trace elements, and several orders of magnitude for light rare-earth elements (LREE) from 590 to 800 °C. The addition of various ligand species into the fluid at 700 °C results in distinctive trends on element partitioning. The concentrations and corresponding partition coefficients of most of the elements are enhanced upon addition of NaF to the fluid. In contrast, NaCl displays a nearly opposite effect by suppressing the solubilities of major elements and consequently affecting the mobility of trace elements that form stable complexes with alkali-(alumino)-silicate clusters in the fluid, e.g. high field strength elements (HFSE). The results further suggest that fluids in equilibrium with orthopyroxene and/or diopsidic clinopyroxene are peralkaline (ASI ~0.1-0.7), whereas fluids in equilibrium with omphacitic pyroxene are more peraluminous (ASI ~1.15). Therefore, natural aqueous fluids in equilibrium with eclogite at about 90 km depth will be slightly peraluminous in composition. Another important finding of this study is the relatively high capacity of aqueous fluids to mobilize LREE, which may be even higher than that of hydrous melts.
DS1982-0616
1982
Zajeev, A.M.Vavilov, V.S., Gippius, A.A., Dravin, V.A., Zajeev, A.M., Zakup.Cathodluminescence of Natural Diamond Associated with Implanted Impurities.Soviet Physics of Semi-conductors, Vol. 16, No. 11, PP. 1288-1290.RussiaBlank
DS1993-1626
1993
Zak, K.Ulrych, J., Pivec, E., Zak, K., Bendl, J., Bosak, P.Alkaline and ultramafic carbonate lamprophyres in Central Bohemian carboniferous basins, Czech republic.Mineralogy and Petrology, Vol. 48, No. 1, pp. 65-83.GlobalAlkaline rocks, Lamprophyres
DS1995-1443
1995
Zak, K.Pasava, J., Kribek, B., Zak, K.Mineral deposits: from their origin to their environmental impactsProceedings Third Biennial SGA Meeting, Balkema Publ, 1100p. approx. 250.00GlobalGranitoid related deposits, Gold, Metamorphism and mineralizations, Industrial minerals, Metallogeny evolution of orogenic belts, Sedex -
DS1991-1918
1991
Zakarchenko, O.D.Zakarchenko, O.D., Kharkiv, A.D., Botova, M.M., Makhin, A.I.Inclusions of deep seated minerals in diamonds from kimberlite rocks From the northern Russian Platform*(in Russian)Mineral. Zhurn., (Russian), Vol. 13, No. 5, pp. 42-52RussiaPetrology, Diamond inclusions
DS1998-0513
1998
ZakariaGiorgobiani, T.V., Basheleishvili, ZakariaThe northward drift of the Gondwanian lithospheric plates and geodynamics of formation of Caucasian OrogenJournal of African Earth Sciences, Vol. 27, 1A, p. 88. AbstractGondwana, Europe, RussiaTectonics, Geodynamics
DS1993-0830
1993
Zakarov, A.A.Kljunin, S.F., Zakarov, A.A.Clastogene pyrope and diamonds of northern Karelia.(Russian)Russian Mineralogical Society Proceedings, No. 6, pp. 43-47.Russia, KareliaMineralogy, Diamonds, pyrope, garnets
DS1994-0563
1994
Zakharch, O.D.Galimov, E.M., Zakharch, O.D., Maltsev, K.A., Makhin, A.I.The isotopic composition of carbon in diamonds from the kimberlitic pipe sat Archangelsk.(Russian)Geochemistry International (Geokhimiya), (Russian), No. 1, pp. 67-74.Russia, Yakutia, ArkangelskGeochronology, Diamond inclusions -carbon
DS1995-1794
1995
ZakharchenkoSobolev, N.V., Yefimova, E., Reimers, Zakharchenko, MakhinArkhangelsk diamond inclusionsProceedings of the Sixth International Kimberlite Conference Abstracts, pp. 558-560.Russia, ArkangelskDiamond inclusions, Deposit -Lomonosov, Pionerskaya, Karpinski, Pomorskaya
DS1997-1074
1997
ZakharchenkoSobolev, N.V., Yefimova, Reimers, Zakharchenko, MakhinMineral inclusions in diamonds of the Arkangelsk kimberlite provinceRussian Geology and Geophysics, Vol. 38, No. 2, pp. 379-393.RussiaDiamond inclusions, Deposit - Zolotitsky, Lomonosov, Karpinsky, Pionerskaya
DS2000-0465
2000
ZakharchenkoKaminsky, F.V., Zakharchenko, Griffin, Channer BlinovaDiamond from the Guaniamo area, VenezuelaCanadian Mineralogist, Vol. 38, no, 6, Dec. pp. 1347-70.VenezuelaDiamond morphology, Mineral inclusions
DS201910-2302
2019
Zakharchenko, E.S.Spivak, A.V., Litvin, Yu.A., Zakharchenko, E.S., Simonova, D.A., Dubrovinsky, L.S.Evolution of diamond forming systems of the mantle transition zone: ringwoodite peritectic reaction ( Mg, Fe)2SiO4 ( experiment at 20GPa)Geochemistry International, Vol. 57, 9, pp. 1000-1007.Mantlediamond genesis

Abstract: The peritectic reaction of ringwoodite (Mg,Fe)2SiO4 and silicate-carbonate melt with formation of magnesiowustite (Fe,Mg)O, stishovite SiO2, and Mg, Na, Ca, K-carbonates is revealed by experimental study at 20 GPa of phase relations in the multicomponent diamond-forming MgO-FeO-SiO2-Na2CO3-CaCO3-K2CO3 system of the Earth mantle transition zone. An interaction of CaCO3 and SiO2 with a formation of Ca-perovskite CaSiO3 is also detected. It is shown that the peritectic reaction of ringwoodite and melt with the formation of stishovite controls physicochemically the fractional ultrabasic-basic evolution of both magmatic and diamond-forming systems of deep horizons of the transition zone up to its boundary with the Earth lower mantle.
DS1994-0564
1994
Zakharchenko, K.A.Galimov, E.M., Zakharchenko, K.A., et al.Carbon isotope composition of diamonds from Arkangel region kimberlitepipes.Geochemistry International, Vol. 31, No. 8, pp. 71-78.Russia, ArkangelskDiamond geochronology, Deposit -Arkangel
DS1989-0127
1989
Zakharchenko, O.D.Blinova, G.K., Verzhak, V.V., Zakharchenko, O.D., Medvedeva, M.S.Impurity centers in diamonds from two kimberlite pipes in the Arkhangel diamond provinceSoviet Geology and Geophysics, Vol. 30, No. 8, pp. 122-125RussiaDiamond inclusions, Arkhangel
DS1989-0393
1989
Zakharchenko, O.D.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
DS1989-0753
1989
Zakharchenko, O.D.Kavasnitsa, V.N., Zakharchenko, O.D., Vladimirova, M.V., Taran, M.N.The features of skeletal cubes of natural diamond.(Russian)Mineralogischeskiy Sbornik, (L'vov), (Russian), Vol. 43, No. 2, pp. 86-90Russia, YakutiaDiamond morphology, Mineralogy
DS1990-0897
1990
Zakharchenko, O.D.Kvasnitsa, V. N., Zakharchenko, O.D.Simple crystal forms of diamond from the kimberlites of one of the regions in the USSR.(Russian)Mineral. Zhurnal, (Russian), Vol. 12, No. 1, pp. 83-86RussiaDiamond crystallography, Diamond morphology
DS1994-1976
1994
Zakharchenko, O.D.Zakharchenko, O.D.Internal structure of diamonds from the Arkhangelsk Province.(Russian)Doklady Academy of Sciences Nauk SSR, (Russian), Vol. 338, No. 1, Sept. pp. 69-73.Russia, YakutiaDiamond morphology
DS1994-1977
1994
Zakharchenko, O.D.Zakharchenko, O.D., Kaminsky, F.V., Milledge, H.J.Internal structure of diamonds from the Arkangelsk province.(Russian)Doklady Academy of Sciences Nauk, (Russian), Vol. 338, No. 1, Sept. pp. 69-73.Russia, ArkangelskDiamond morphology
DS1996-1585
1996
Zakharchenko, O.D.Zakharchenko, O.D., Kaminsky, F.V., Milledge, H.J.Internal structure of Arkangel province diamondsDoklady Academy of Sciences, Vol. 341A, No. 3, April, pp. 62-68.Russia, ArkangelskDiamond morphology, Diamond genesis
DS1998-0717
1998
Zakharchenko, O.D.Kaminsky, F.V., Zakharchenko, O.D., Channer, D.M., et al.Diamonds from the Guaniamo area, Venezuela7th International Kimberlite Conference Abstract, pp. 395-7.VenezuelaDiamond morphology, placers, alluvials, Deposit - Guaniamo
DS2001-0567
2001
Zakharchenko, O.D.Kaminsky, F.V., Zakharchenko, O.D., Davies, R., GriffinSuperdeep diamonds from the Juin a area, Mato Grosso State, BrasilContributions to Mineralogy and Petrology, Vol. 140, pp. 734-53.GlobalDiamond - morphology, alluvial, ultra high pressure (UHP), Mineral chemistry
DS200412-2000
2004
Zakharchenko, O.D.Titkov, S.V., Gorshkov, A.I., Magazina, L.O., Sivtsov, A.V., Zakharchenko, O.D.Shapeless dark diamonds ( Yakutites) from placers of the Siberian platform and criteria of their impact origin.Geology of Ore Deposits, Vol. 46, 3, pp. 191-201.Russia, SiberiaDiamond morphology
DS200612-0662
2006
Zakharchenko, O.D.Kaminsky, F.V., Zakharchenko, O.D., Khachatryan, G.K., Griffin, W.L., Der, D.M.Diamond from the Los Coquitos area, Bolivar State, Venezuela.Canadian Mineralogist, Vol. 44, 2, April pp. 323-340.South America, VenezuelaDiamond mineralogy
DS200612-1286
2005
Zakharchenko, O.D.Shiryaev, A.A., Izraeli, E.S., Hauri, E.H., Zakharchenko, O.D., Navon, O.Chemical optical and isotopic investigation of fibrous diamonds from Brazil.Russian Geology and Geophysics, Vol. 46, 12, pp. 1185-1201.South America, BrazilDiamond morphology
DS200912-0358
2009
Zakharchenko, O.D.Kaminsky, F.V., Sablukov, S.M., Sablukova, L.I., Zakharchenko, O.D.The Fazenda Largo off-craton kimberlites of Piaui State Brazil.Journal of South American Earth Sciences, Vol. 28, 3, pp. 288-303.South America, Brazil, PiauiDeposit - Fazenda
DS1995-2116
1995
Zakharchnko, O.Zakharchnko, O., Botova, M., Khachatryan, G.Diamonds from Lomonosov mine of Arkangelsk regionProceedings of the Sixth International Kimberlite Conference Abstracts, pp. 680.Russia, ArkangelskDiamond morphology, Deposit -Lomonosov
DS201808-1724
2018
Zakharov, D.Avice, G., Marty, B., Burgess, R., Hofmann, A., Philippot, P., Zahnle, K., Zakharov, D.Evolution of atmospheric xenon and other noble gases inferred from Archean to Paleoproterozoic rocks.Geochimica et Cosmochimica Acta, Vol. 232, pp. 82-100.Mantlegeochemistry

Abstract: We have analyzed ancient atmospheric gases trapped in fluid inclusions contained in minerals of Archean (3.3?Ga) to Paleozoic (404?Ma) rocks in an attempt to document the evolution of the elemental composition and isotopic signature of the atmosphere with time. Doing so, we aimed at understanding how physical and chemical processes acted over geological time to shape the modern atmosphere. Modern atmospheric xenon is enriched in heavy isotopes by 30-40‰ u-1 relative to Solar or Chondritic xenon. Previous studies demonstrated that, 3.3?Ga ago, atmospheric xenon was isotopically fractionated (enriched in the light isotopes) relative to the modern atmosphere, by 12.9?±?1.2 (1s) ‰ u-1, whereas krypton was isotopically identical to modern atmospheric Kr. Details about the specific and progressive isotopic fractionation of Xe during the Archean, originally proposed by Pujol et al. (2011), are now well established by this work. Xe isotope fractionation has evolved from 21‰ u-1 at 3.5?Ga to 12.9‰ u-1 at 3.3?Ga. The current dataset provides some evidence for stabilization of the Xe fractionation between 3.3 and 2.7?Ga. However, further studies will be needed to confirm this observation. After 2.7?Ga, the composition kept evolving and reach the modern-like atmospheric Xe composition at around 2.1?Ga ago. Xenon may be the second atmospheric element, after sulfur, to show a secular isotope evolution during the Archean that ended shortly after the Archean-Proterozoic transition. Fractionation of xenon indicates that xenon escaped from Earth, probably as an ion, and that Xe escape stopped when the atmosphere became oxygen-rich. We speculate that the Xe escape was enabled by a vigorous hydrogen escape on the early anoxic Earth. Organic hazes, scavenging isotopically heavy Xe, could also have played a role in the evolution of atmospheric Xe. For 3.3?Ga-old samples, Ar-N2 correlations are consistent with a partial pressure of nitrogen (pN2) in the Archean atmosphere similar to, or lower than, the modern one, thus requiring other processes than a high pN2 to keep the Earth's surface warm despite a fainter Sun. The nitrogen isotope composition of the atmosphere at 3.3?Ga was already modern-like, attesting to inefficient nitrogen escape to space since that time.
DS1986-0187
1986
Zakharov, E.P.Dobryanskii, L.A., Kurilov, M.V., Boreiko, L.G., Zakharov, E.P.Characteristics of the distribution of trace elements in Rocks of the diamond bearing suite of the Chistyakovo Snezhnaya trough of the DonetsBasin.(Russian)Dopov. Akad. Nauk UKR. RSR Ser. B., Geokl. Khim. Biol., (Russian), No. 3, pp. 5-8RussiaBlank
DS201412-1020
2014
Zakharov, E.V.Zakharov, E.V., Kurilko, A.S.Local minimum of energy consumption in hard rock failure in negative temperature range.Journal of Mining Science, Vol. 50, 2, pp. 284-287.RussiaDeposit - Udachnaya, Internationalskaya
DS1991-1919
1991
Zakharov, M.N.Zakharov, M.N., Bobrov, Yu.D.First find of potassic basalt in volcanic rocks in the Magadan region Of the Okhotsk-Chukotka volcanic beltDoklady Academy of Science USSR, Earth Science Section, Vol. 308, No. 5, pp. 216-219RussiaPotassic basalt, Alkaline rocks
DS1994-0933
1994
Zakharov, M.V.Kogarko, L.N., Rudchenko, N.A., Zakharov, M.V.Geochemistry of alkali magmatism along the Clarion FractureGeochemistry International, Vol. 31, No. 3, pp. 12-36.Russia, Kola PeninsulaGeodynamics, Tectonics
DS1996-1586
1996
Zakharov, V.S.Zakharov, V.S., Selivanov, V.A.Identification of zones of tectonic and geomorphic activation in SouthAmericaDoklady Academy of Sciences, Vol. 345A, No. 9, Oct. pp. 232-237South AmericaTectonics
DS2001-1290
2001
Zakharov, V.S.Zakharov, V.S.A model for the deformation of rheologically layered crust during continental collisionMoscow University Geology Bulletin, Vol. 55, No. 6, pp. 9-16.RussiaTectonics
DS201901-0055
2018
Zakharov, V.S.Perchuk, A.L., Safonov, O.G., Smit, C.A., van Reenen, D.D., Zakharov, V.S., Gerya, T.V.Precambrian ultra-hot orogenic factory: making and reworking of continental crust.Tectonophysics, Vol. 746, pp. 572-586.Mantlesubduction

Abstract: Mechanisms of Precambrian orogeny and their contribution to the origin of ultrahigh temperature granulites, granite-greenstone terranes and net crustal growth remain debatable. Here, we use 2D numerical models with 150 °C higher mantle temperatures compared to present day conditions to investigate physical and petrological controls of Precambrian orogeny during forced continental plates convergence. Numerical experiments show that convergence between two relatively thin blocks of continental lithosphere with fertile mantle creates a short-lived cold collisional belt that later becomes absorbed by a long-lived thick and flat ultra-hot accretionary orogen with Moho temperatures of 700-1100 °C. The orogen underlain by hot partially molten depleted asthenospheric mantle spreads with plate tectonic rates towards the incoming lithospheric block. The accretionary orogeny is driven by delamination of incoming lithospheric mantle with attached mafic lower crust and invasion of the hot partially molten asthenospheric wedge under the accreted crust. A very fast convective cell forms atop the subducting slab, in which hot asthenospheric mantle rises against the motion of the slab and transports heat towards the moving orogenic front. Juvenile crustal growth during the orogeny is accompanied by net crustal loss due to the lower crust subduction. Stability of an ultra-hot orogeny is critically dependent on the presence of relatively thin and warm continental lithosphere with thin crust and dense fertile mantle roots subjected to plate convergence. Increased thickness of the continental crust and subcontinental lithospheric mantle, pronounced buoyancy of the lithospheric roots, and decreased mantle and continental Moho temperature favor colder and more collision-like orogenic styles with thick crust, reduced magmatic activity, lowered metamorphic temperatures, and decreased degree of crustal modification. Our numerical modeling results thus indicate that different types of orogens (cold, mixed-hot and ultra-hot) could be created at the same time in the Early Earth, depending on compositional and thermal structures of interacting continental blocks.
DS201906-1333
2019
Zakharov, V.S.Perchuk, A.L., Zakharov, V.S., Gerya, T.V., Brown, M.Hotter mantle but colder subduction in the Precambrian: what are the implications?Precambrian Research, Vol. 330, pp. 20-34.Mantlesubduction

Abstract: On contemporary Earth, subduction recycles mafic oceanic crust and associated volatile elements, creating new silicic continental crust in volcanic arcs. However, if the mantle was hotter in the Precambrian, the style of subduction, the depth of devolatilization and the formation of silicic continental crust may have been different. Consequently, the generation of the tonalite-trondhjemite-granodiorite (TTG) suite, which is characteristic of Archean crust, may not have been related to subduction. Here, we use a two-dimensional numerical magmatic-thermomechanical model to investigate intraoceanic subduction for contemporary mantle conditions and at higher mantle temperatures, as appropriate to the Precambrian. In each case, we characterize the thermal structure of the subducting plate and investigate magma compositions and production rates. We use these results to assess the potential growth of silicic continental crust associated with intraoceanic subduction at different mantle temperatures. For the Precambrian, in a set of experiments with ?T?=?150?K and decreasing subducting plate velocity, we find that the contemporary style of subduction was preceded by an arc-free regime dominated by rapid trench rollback and vigorous upwelling of asthenospheric mantle into the space created above the retreating slab. In this regime, formation of magmas by fluid-fluxed melting of the mantle is suppressed. Instead, decompression melting of upwelling asthenospheric mantle results in the widespread development of voluminous plateau-like basaltic magmas. In addition, retreating subduction at higher mantle temperature causes faster descent of the downgoing slab, leads to colder thermal gradients, similar to those associated with active subduction in the western Pacific today, and suppresses melting of the basaltic crust, limiting production of silicic (adakite-like) magmas. With increasing maturity of the subduction system, retreat of the subducting plate ceases, the role of decompression melting strongly decreases and fluid-fluxed melting of the mantle coupled with melting of the hydrated slab begins to produce basaltic and felsic arc volcanic rocks similar to those formed during contemporary subduction. In an additional series of individual experiments at various ?T, an increase of the mantle temperature above ?T?=?150?K leads to episodic and short-lived subduction accompanied by limited production of silicic continental crust. The results of our experimental study demonstrate that a hotter mantle in the Precambrian changes dramatically both the slab dynamics and the processes of magma generation and crustal growth associated with intraoceanic subduction zones. These changes may preclude growth of the early Precambrian silicic continental crust by processes that were dominantly similar to those associated with contemporary subduction.
DS1983-0646
1983
Zakharova, E.M.Zakharova, E.M.New Developments in the Mineral Concentrate MethodMoscow University Geol. Bulletin., Vol. 38, No. 4, PP. 51-56.RussiaSampling, Non-kimberlitic
DS1997-0615
1997
Zakharova, O.N.Konstantinovskii, A.A., Zakharova, O.N.Platformal diamond paleoplacers and their formation conditions: evidence from the Botuoba Saddle, SiberiaLithology and Mineral resources, Vol. 32, No. 4, July-Aug. pp. 330-335.Russia, SiberiaPlatform, Alluvials
DS1993-1625
1993
Zakharova, T.L.Tychkov, S.A., Zakharova, T.L., Kulakov, I.Yu.Dynamics of the mantle in subduction zonesRussian Geology and Geophysics, Vol. 34, No. 8, pp. 1-8.MantleGeodynamics
DS201706-1084
2017
Zakhvataev, V.E.Khlebopros, R.G., Zakhvataev, V.E., Gabuda, S.P., Kozlova, S.G., Slepkov, V.A.Possible mantle phase transitions by the formation of Si02 peroxides: implications for mantle convection.Doklady Earth Sciences, Vol. 473, 2, pp. 416-418.Mantleconvection

Abstract: On the basis of quantum-chemical calculations of the linear to isomeric bent transition of the SiO2 molecule, it is suggested that the bent to linear transition of SiO2 forms can occur in melted mantle minerals of the lower mantle. This may be important for the formation of the peculiarities of mantle convection and origination of plumes.
DS200612-1381
2006
Zakosarenko, V.Stoltz, R., Chweala, A., Zakosarenko, V., Schulz, M., Fritzsch, L., Meyer, H-G.SQUID technology for geophysical exploration. ( not specific to diamonds)Society of Exploration Geophysics, abstract 5p.GlobalGeophysics - magnetic airborne gradiometer
DS1989-1674
1989
Zakreski, D.Zakreski, D.Rumors of glory..are there diamonds in the North Saskatchewan River? That depends on who you talk toCanadian Business, April pp. 83-86, 88SaskatchewanOverview of prospecting activities
DS1982-0616
1982
Zakup.Vavilov, V.S., Gippius, A.A., Dravin, V.A., Zajeev, A.M., Zakup.Cathodluminescence of Natural Diamond Associated with Implanted Impurities.Soviet Physics of Semi-conductors, Vol. 16, No. 11, PP. 1288-1290.RussiaBlank
DS1995-0115
1995
Zakuzennyi, V.I.Baryshev, A.S., Zakuzennyi, V.I., Urumov, J.D.Technique of a prognosis and prospecting of diamond S host rocks on The south of Siberian PlatformProceedings of the Sixth International Kimberlite Conference Extended Abstracts, p. 38-39.Russia, YakutiaPGM - Physico-geological model
DS201809-2100
2018
Zal, H.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.
DS1988-0140
1988
Zalan, P.V.Conceicao, J.C.J., Zalan, P.V., Wolff, S.The South Atlantic rifting. (in Portugese)Revista Brasileira de Geociencias, (in Portugese)., Vol. 18, No. 3, September p. 314. (abstract.)Brazil, Southern AfricaTectonics
DS2000-0210
2000
ZaleskiDavis, W.J., Hanmer, Aspler, Sandeman, Tella, ZaleskiRegional differences in the Neoarchean crustal evolution of the Western Churchill Province: sense??Geological Association of Canada (GAC)/Mineralogical Association of Canada (MAC) 2000 Conference, 4p. abstract.Manitoba, Western CanadaGeochronology - Hearne domain
DS1990-0823
1990
Zaleski, E.Kerr, A., Zaleski, E., Weber, W.Report on field meeting on the Archean Proterozoic transition in ZimbabweGeoscience Canada, Vol. 17, No. 1, March pp. 33-37ZimbabwePlatinuM., Archean Proterozoic
DS1997-1289
1997
Zaleski, E.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
DS1988-0781
1988
Zalinshchak, B.L.Zimin, S.S., Zalinshchak, B.L.New model of the formation of carbonatite and associated oresDoklady Academy of Science USSR, Earth Science Section, Vol. 289, No. 1-6, January pp. 140-143RussiaBlank
DS1985-0647
1985
Zalishchak, B.L.Strizhkova, A.A., Vasilenko, G.P., Zalishchak, B.L.Discovery of Picrite Basalts in the Verkhne Ussuri Ore Region. (russian)Magmat. Rudn. Raionov Dalnego Vostoka, (Russian), pp. 168-170RussiaBlank
DS1995-2117
1995
Zalishchak, B.L.Zalishchak, B.L., Solyanik, V.A.The far eastern provinces of kimberlites, lamproites, nephelinites.alkaline basaltoids, Hyperbasites ...Proceedings of the Sixth International Kimberlite Conference Abstracts, pp. 681.Russia, Primoye, Khabarovsk, Amur, Sakhalin IslandLamproites, Khanka, Sikhote- Alin, Anjui
DS200812-0646
2008
Zalisjchak, B.L.Lennikov, A.M., Zalisjchak, B.L., Oktyabrsky, R.A., Ivanov, V.V.Variations of chemical composition in platinum group minerals and gold of the Konder alkali ultrabasic massif, Aldan Shield, Russia.Deep Seated Magmatism, its sources and plumes, Ed. Vladykin, N.V., 2008 pp. 181-208.RussiaKonder alkaline massif
DS200712-1195
2007
Zalkind, O.A.Yakovenchuk, V.N., Pakhomovsky,Y.A., Menshikov, Y.P., Mikhailova, J.A., Ivanyuk, G.Y., Zalkind, O.A.Krivovichevite a new mineral species from the Lovozero alkaline massif, Kola Peninsula, Russia.The Canadian Mineralogist, Vol. 45, 3, pp. 451-456.Russia, Kola PeninsulaAlkaline rocks, mineralogy
DS200712-1196
2007
Zalkind, O.A.Yakovenchuk, V.N., Pakhomovsky,Y.A., Menshikov, Y.P., Mikhailova, J.A., Ivanyuk, G.Y., Zalkind, O.A.Krivovichevite a new mineral species from the Lovozero alkaline massif, Kola Peninsula, Russia.The Canadian Mineralogist, Vol. 45, 3, pp. 451-456.Russia, Kola PeninsulaAlkaline rocks, mineralogy
DS1985-0760
1985
Zamarayev, S.M.Zamarayev, S.M.Geology and Mineral Resources of Eastern Siberia.(russian)Izd. Nauka Sib. Otd.Novosibirsk, (Russian), 200pRussiaBlank
DS1982-0224
1982
Zamareyev, S.M.Grabkin, O.V., Zamareyev, S.M., Melnikov, A.I.The Correlation of Endogene Processes of the Siberian Platform and its Framework.Izd. Nauka Sib. Otd. Novosibirsk, Sssr., 129P.Russia, SiberiaKimberlite, Zoning, Diamonds, Genesis
DS1989-1675
1989
Zambezi, P.Zambezi, P.Rare earth elements occurrence at the Nkombwa Hill carbonatiteZimco, MINEX seminar on Carbonatites and other igneous phosphate bearing, Held Feb. 1, 1989, 1pZambiaCarbonatite
DS1989-1676
1989
Zambezi, P.Zambezi, P.An occurrence of rare earth elements at Nkombwa Hillcarbonatite, ZambiaZambian Journal of Applied Earth Sciences, Vol. 3, No. 1, August pp. 36-38ZambiaCarbonatite -rare earths, Nkombwa Hill
DS1997-1290
1997
Zambezi, P.Zambezi, P., Voncken, J.H.L., Touret, J.L.R.Bastnasite (Ce) at the Nkomba Hill carbonatite complex, Isoka District, northeast Zambia.Mineralogy and Petrology, Vol. 59, No. 3/4, pp. 239-250.ZambiaCarbonatite
DS200412-1328
2004
Zamozhnyana, N.G.Mints, M.V., Berzin, R.G., Suleimanov,A.K., Zamozhnyana, N.G., Stupak, Konilov, Zlobin, KaulinaThe deep structure of Early Precambrian Crust of the Karelian Craton, southeastern Fennoscandian shield: results of investigatioGeotectonics, Vol. 38, 2, pp. 87-102.Europe, Fennoscandia, Kola PeninsulaGeophysics - seismics
DS200512-0728
2004
Zamozhnyaya, N.G.Mints, M.V., Berzin, R.G., Andryushchenko, Y.N., Zamozhnyaya, N.G., Zlobin, Konilov, Stupak, SuleimanovThe deep structure of the Karelian Craton along Geotraverse 1-EB.Geotectonics, Vol. 38, 5, pp. 329-342.RussiaGeophysics - seismics
DS2002-1057
2002
Zamozhnyaya, R.G.Mints, M.V., Berzin, R.G., Zamozhnyaya, R.G., Zlobin, V.L., Kaulina, T.V.Paleoproterozoic collision structures in the deep crustal section of the Karelian Craton:Doklady Earth Sciences, Vol. 385, 6, pp. 635-40.RussiaGeodynamics, tectonics, Craton - Karelia
DS202008-1438
2019
Zamyatin, D.A.Rezvukhina, O.V., Korsakov, A.V., Rezvukin, D.I., Zamyatin, D.A., Zelenovskiy, P.S., Greshnyakov, E.D., Shur, V.Y.A combined Raman spectroscopy, cathodoluminescence, and electron backscatter diffraction study of kyanite porphyroblasts from diamondiferous and diamond-free metamorphic rocks ( Kokchetav Massif).Journal of Raman Spectroscopy, 13p. PdfRussialuminescence

Abstract: A series of precise nondestructive analytical methods (Raman spectroscopy, cathodoluminescence, and EBSD—electron backscatter diffraction) has been employed to investigate the internal textures of kyanite porphyroblasts from diamondiferous and diamond-free ultrahigh-pressure metamorphic rocks (Kokchetav massif, Northern Kazakhstan). Such internal kyanite characteristics as twinning, radial fibrous pattern, and spotty zoning were identified by means of Raman and cathodoluminescence imaging, whereas an intergrowth of two kyanite crystals was distinguished only by Raman imaging. The EBSD analysis recorded an ~10-25° changing of orientations along the elongation in the investigated kyanite porphyroblasts. The absence of a radial fibrous pattern and a spotty zoning on the EBSD maps indicates that these textures are not related to variations in crystallographic orientation. The absence of clear zoning patterns (cores, mantles, and rims) on the Raman, cathodoluminescence, or EBSD maps of the kyanite porphyroblasts indicates the rapid single-stage formation of these porphyroblasts near the peak metamorphic conditions and the lack of recrystallization processes. The obtained results provide important implications for deciphering of mineral internal textures, showing that the data obtained by cathodoluminescence mapping can be clearly reproduced by Raman imaging, with the latter method occasionally being even more informative. This observation is of significant importance for the study of minerals that are unexposed on a thin section surface or Fe- and Ni-rich minerals that do not show luminescence emission. The combination of the Raman spectroscopic, cathodoluminescence, and EBSD techniques may provide better spatial resolution for distinguishing different domains and textural peculiarities of mineral than the selective application of individual approaches.
DS202101-0031
2020
Zamyatin, D.A.Rezvukhina, O.V., Korsakov, A.V., Rezvukin, D.I., Mikhailenko, D.S., Zamyatin, D.A., Greshnyakov, E.D., Shur, V.Y.Zircon from diamondiferous kyanite gneisses of the Kokchetav massif: revealing growth stages using an integrated cathodluminescence- Raman spectroscopy- electron microprobe approach.Mineralogical Magazine, in press 28p. https://doi.org /10.1180/mgm.2020.95RussiaKokchetav
DS201604-0590
2015
Zamyatin, N.I.Alexakhin, V.Yu., Bystritsky, V.M., Zamyatin, N.I., Zubarev, E.V., Krasnoperov, A.V., Rapatsky, V.L., Rogov, Yu.N., Sadovsky, A.B., Salamatin, A.V., Salmin, R.A., Sapozhnikov, M.G., Slepnev, V.M., Khabarov, S.V., Razinkov,E.A., Tarasov, O.G., Nikitin,G.M.Detection of diamonds in kimberlite by the tagged neutron method.Nuclear Instruments and Methods in Physics Research Section A., A785, pp. 9-13.TechnologyMethodology

Abstract: A new technology for diamond detection in kimberlite based on the tagged neutron method is proposed. The results of experimental researches on irradiation of kimberlite samples with 14.1-MeV tagged neutrons are discussed. The source of the tagged neutron flux is a portable neutron generator with a built-in 64-pixel silicon alpha-detector with double-sided stripped readout. Characteristic gamma rays resulting from inelastic neutron scattering on nuclei of elements included in the composition of kimberlite are registered by six gamma-detectors based on BGO crystals. The criterion for diamond presence in kimberlite is an increased carbon concentration within a certain volume of the kimberlite sample.
DS201812-2856
2019
Zanatta, M.Nazzarini, S., Nestola, F., Zanon, V., Bindi, L., Scricciolo, E., Petrelli, M., Zanatta, M., Mariotto, G., Giuli, G.Discovery of moissanite in a peralkaline syenite from the Azores Islands.Lithos, Vol. 324-325, pp. 68-73.Europe, Portugal, Azoresmoissanite

Abstract: Our discovery of moissanite grains in a peralkaline syenite from the Água de Pau Volcano (São Miguel, Azores Islands, Portugal) represents the first report of this mineral in present day oceanic geodynamic settings. Raman spectroscopy and single-crystal X-ray diffraction show the presence of both the 6H and 4H polytypes with the predominance of the first one. The distribution of trace elements is homogeneous, except for Al and V. Azorean moissanite often hosts rounded inclusions of metallic Si and other not yet identified metallic alloys. A process involving a flushing of CH4-H2 ultra-reducing fluids in the alkaline melts might be considered as a possible mechanism leading to the formation of natural SiC, thus calling for strongly reducing conditions that were locally met in the crust-mantle beneath the São Miguel Island.
DS200912-0236
2009
Zanchetta, S.Fumagalli, P., Zanchetta, S., Pell, S.Alkali in phlogopite and amphibole and their effects on phase relations in metasomatized peridotites: a high pressure study.Contributions to Mineralogy and Petrology, Vol. 158, pp. 723-737.MantleMetasomatism. subduction
DS200412-2196
2004
Zanda, B.Zanda, B.Chondrules.Earth and Planetary Science Letters, Vol. 224, 1-2, July, 30, pp. 1-17.TechnologyMeteorite, solar nebula, early chemical fractionations
DS200912-0495
2009
ZandtMercier, J.P., Bostock, M.G., Cassidy, J.F., Dueker, K., Gaherty, J.B., Garnero, E.J., Revenaugh, ZandtBody wave tomography of western Canada.Tectonophysics, Vol. 475, 2, pp. 480-492.Canada, Alberta, British Columbia, Northwest TerritoriesGeophysics - seismics
DS1984-0571
1984
Zandt, G.Owens, T.J., Zandt, G., Taylor, S.R.Seismic Evidence for an Ancient Rift Beneath the Cumberlandplateau, Tennessee: a Detailed Analysis of Broadband Teleseismic P Waveforms.Journal of Geophysical Research, Vol. 89, No. B9, SEPT. 10TH. PP. 7783-7795.GlobalMid Continent
DS1994-1978
1994
Zandt, G.Zandt, G., Velasco, A.A., Beck, S.L.Composition and thickness of the southern Altiplano crust, BoliviaGeology, Vol. 221, No. 11, November pp. 1003-1006BoliviaTectonics, Cordilleran -Andes
DS1995-2118
1995
Zandt, G.Zandt, G., Ammon, C.J.Continental crust composition constrained by measurements of crustalPoisson's ratio.Nature, Vol. 374, No. 6518, March 9, pp. 152-153.MantleCrust composition
DS1996-0105
1996
Zandt, G.Beck, S.L., Zandt, G., et al.Crustal thickness variations in the central AndesGeology, Vol. 24, No. 5, May, pp. 407-410Bolivia, ArgentinaTectonics
DS1998-1269
1998
Zandt, G.Ruppert, S., Fliedner, M.M., Zandt, G.Thin crust and active upper mantle beneath the southern Sierra Nevada In the western United States.Tectonophysics, Vol. 286, No. 1-4, Mar. 10, pp. 237-252.Nevada, CaliforniaGeophysics - seismic
DS2002-0132
2002
Zandt, G.Beck, S.L., Zandt, G.The nature of orogenic crust in central AndesJournal of Geophysical Research, Oct. 29, 10.1029/2001JB000124.AndesOrogeny
DS200512-0814
2005
Zandt, G.Ozacar, A.A., Zandt, G.Crustal seismic anisotropy in central Tibet: implications for deformational style and flow in the crust.Geophysical Research Letters, Vol. 31, 23, Dec. 16, DOI 10.1029/2004 GLO21096Asia, TibetGeophysics - seismics
DS200712-0361
2007
Zandt, G.Gilbert, H., Velasco, A.A., Zandt, G.Preservation of Proterozoic terrane boundaries within the Colorado Plateau and implications for its tectonic evolution.Earth and Planetary Science Letters, Vol. 256, 1-2, June 15, pp. 237-248.United States, Colorado PlateauTectonics
DS200812-1306
2008
Zandt, G.Zandt, G., Humphreys, E.Toroidal mantle flow through the western U.S. slab window.Geology, Vol. 36, 4, pp. 295-298.MantleSubduction
DS200912-0802
2008
Zandt, G.Wagner, L.B., Anderson, M.L., Jackson, J.M., Beck, S.L., Zandt,G.Seismic evidence for orthopyroxene enrichment in the continental lithosphere.Geology, Vol. 36, 12, Dec. pp. 936=938.MantleGeophysics - seismics
DS201601-0015
2015
Zandt, G.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
DS202007-1171
2020
Zandt, G.Portner, D.E., Rodriguez, E.E., Beck, S., Zandt, G., Scire, A., Rocha, M.P.Detailed structure of the subducted Nazca slab into the lower mantle derived from continent scale teleseismic P wave tomography.Journal of Geophysical Research: Solid Earth, Vol. 125, e2019JB017884.Mantle, South Americasubduction

Abstract: Nazca subduction beneath South America is one of our best modern examples of long-lived ocean-continent subduction on the planet, serving as a foundation for our understanding of subduction processes. Within that framework, persistent heterogeneities at a range of scales in both the South America and Nazca plates is difficult to reconcile without detailed knowledge of the subducted Nazca slab structure. Here we use teleseismic travel time residuals from >1,000 broadband and short-period seismic stations across South America in a single tomographic inversion to produce the highest-resolution contiguous P wave tomography model of the subducting slab and surrounding mantle beneath South America to date. Our model reveals a continuous trench-parallel fast seismic velocity anomaly across the majority of South America that is consistent with the subducting Nazca slab. The imaged anomaly indicates a number of robust features of the subducted slab, including variable slab dip, extensive lower mantle penetration, slab stagnation in the lower mantle, and variable slab amplitude, that are incorporated into a new, comprehensive model of the geometry of the Nazca slab surface to ~1,100 km depth. Lower mantle slab penetration along the entire margin suggests that lower mantle slab anchoring is insufficient to explain along strike upper plate variability while slab stagnation in the lower mantle indicates that the 1,000 km discontinuity is dominant beneath South America.
DS1999-0823
1999
Zanetti, A.Zanetti, A., Mazzucchelli, M., Vanucci, R.The Finero phlogopite peridotite massif: an example of subduction relatedMetasomatismContributions to Mineralogy and Petrology, Vol. 134, No. 2-3, pp. 107-122.ItalyMetasomatism, perioditite
DS2001-1291
2001
Zanetti, A.Zanetti, A., Vanucci, R., Piccardo, G.B.The lithospheric mantle beneath the Assab region: a LAM ICP Ms study of peridotite and pyroxenite xenoliths.Plinius, No. 24, pp. 223-4. abstractGlobalXenoliths, Afur region - eastern African Rift
DS2003-0330
2003
Zanetti, A.Dencker, I., Nimis, P., Zanetti, A., Sobolev, N.V.Major and trace elements composition of Cr diopsides from the Zagadochnaya8ikc, Www.venuewest.com/8ikc/program.htm, Session 4, POSTER abstractRussia, YakutiaMantle geochemistry, Deposit - Zagadochnaya
DS2003-1380
2003
Zanetti, A.Tiepolo, M., Zanetti, A., Oberti, R., Brumm, R., Foley, S., Vannucci, R.Trace element partitioning between synthetic potassic richterites and silicate melts, andEuropean Journal of Mineralogy, Vol. 15, 2, pp. 329-40.GlobalMineralogy
DS200412-1674
2004
Zanetti, A.Rivalenti, G., Zanetti, A., Mazzucchelli, M., Vanucci, R., Congolani, C.A.Equivocal carbonatite markers in the mantle xenoliths of the Patagonia backarc: the Gobernador Gregores case ( Santa Cruz ProvinContributions to Mineralogy and Petrology, Vol. 147, 6, pp. 647-670.South America, ArgentinaCarbonatite
DS200412-1992
2003
Zanetti, A.Tiepolo, M., Zanetti, A., Oberti, R., Brumm, R., Foley, S., Vannucci, R.Trace element partitioning between synthetic potassic richterites and silicate melts, and contrasts with the partitioning behaviEuropean Journal of Mineralogy, Vol. 15, 2, pp. 329-40.TechnologyMineralogy
DS200412-2197
2004
Zanetti, A.Zanetti, A., Tiepolo, M., Oberti, R., Vannucci, R.Trace element partitioning in olivine: modelling of a complete dat a set from a synthetic hydrous basanite melt.Lithos, Vol. 75, 1-2, July, pp. 39-54.TechnologyGeochemistry - petrogenetic processes, fingerprinting
DS200512-0907
2004
Zanetti, A.Rivalenti, G., Mazzucchelli, M., Laurora, A., Ciuffi, S.I.A., Zanetti, A., Vannucci, R., Cingolani, C.A.The backarc mantle lithosphere in Patagonia, South America.Journal of South American Earth Sciences, Vol. 17, 2, Oct. 30, pp. 121-152.South America, PatagoniaXenoliths, geothermometry, melting, slab, subduction
DS200612-1164
2006
Zanetti, A.Rivalenti, G., Zanetti, A., Giradri, V.A.V., Mazzucchelli, M., Tassinari, C.G., Bertotto, G.W.The effect of the Fernando de Noronha plume on the mantle lithosphere in north eastern Brazil.Lithos, in press available,South America, BrazilXenoliths, alkali basalts, geochemistry
DS200712-0897
2006
Zanetti, A.Rivalenti, G., Zanetti, A., Girardi, V.A.V., Mazzucchelli, M., Colombo, C.G., Bertotto, G.W.The effect of the Fernando de Noronha plume on the mantle lithosphere in north eastern Brazil.Geochimica et Cosmochimica Acta, In press availableSouth America, BrazilXenolith - alkali basalt
DS200912-0607
2009
Zanetti, A.Raffone, N., Chazot, G., Pin, C., Vannucci, R., Zanetti, A.Metasomatism in the lithospheric mantle beneath Middle Atlas ( Morocco) and the origin of Fe- and Mg- rich wehrlites.Journal of Petrology, Vol. 50, 2, pp. 197-249.Africa, MoroccoMetasomatism
DS201012-0493
2010
Zanetti, A.Melluso, L., Srivastava, R.K., Guarino, V., Zanetti, A., Sinha, A.K.Mineral compositions and petrogenetic evolution of the ultramafic alkaline carbonatitic complex of Sung Valley, northeastern India.The Canadian Mineralogist, Vol. 48, 2, pp. 205-229.IndiaCarbonatite
DS201112-0616
2011
Zanetti, A.Longo, M., Nimis, P., Ziberna, L., Marzoli, A., Zanetti, A., Franz, L.Geochemistry of xenoliths from the Gibeon kimberlite province, Namibia.Goldschmidt Conference 2011, abstract p.1354.Africa, NamibiaOff-craton
DS201112-1173
2011
Zanetti, A.Ziberna, L., Nimis, P., Zanetti, A., Sobolev, N.V., Marzoli, A.Geochemistry of mantle microxenoliths from Zagadochnaya kimberlite, Yakutia, Russia.Goldschmidt Conference 2011, abstract p.2283.Russia, YakutiaNarren Type II kimberlite
DS201212-0592
2012
Zanetti, A.Rocco, I., Lustrino, M., Zanetti, A., Morra, V., Melluso, L.Petrology of ultramafic xenoliths in Cenozoic alkaline rocks of northern Madagascar ( Nosy Be Archipelago)Journal of South American Earth Sciences, in press availableAfrica, MadagascarBasanites, Foidites
DS201312-0748
2013
Zanetti, A.Rocco, I., Lustino, M., Zanetti, A., Morra, V., Melluso, L.Petrology of ultramafic xenoliths in Cenozoic alkaline rocks of northern Madagascar. Nosy Be Journal of South American Earth Sciences, Vol. 41, pp. 122-139.Africa, MadagascarBasanites, Foidites
DS201312-1022
2013
Zanetti, A.Ziberna, L., Nimis, P., Zanetti, A., Marzoli, A., Sobolev, N.V.Metasomatic processes in the central Siberian cratonic mantle: evidence from garnet xenocrysts from the Zagadochnaya kimberlite.Journal of Petrology, Vol. 54, pp. 2379-2409.Russia, SiberiaDeposit - Zagadochnaya
DS201708-1580
2017
Zanetti, A.Rocco, I., Zanetti, A., Melluso, L., Morra, V.Ancient depleted and enriched mantle lithosphere domains in northern Madagascar: geochemical and isotopic evidence from spinel-to-plagioclase-bearing ultramafic xenoliths. Massif d'Ambre and BobaombyChemical Geology, in press available, 16p.Africa, Madagascarmelting

Abstract: Mantle xenoliths hosted in Cenozoic alkaline rocks of northern Madagascar (Massif d'Ambre and Bobaomby volcanic fields) are spinel lherzolites, harzburgites and rare websterites. Petrography, electron microprobe, LA-ICP-MS and thermal ionization mass spectrometry techniques allowed to recognize domains characterized by variable degree of partial melting and extent of re-enrichment processes: 1) refractory spinel-to-spinel + plagioclase-lherzolites, with clinopyroxenes having marked LREE (Light Rare Earth Elements) depletion ((La/Yb)N ~ 0.2) and very high 143Nd/144Nd (0.513594), which represent a limited and shallow portion of old mantle that suffered low degree partial melting (2–3%) and was later accreted to the lithosphere. These lherzolites acted as a low-porosity region, being, in places, percolated by small volumes of melts shortly before eruption; 2) lherzolites and harzburgites that suffered variable degrees of partial melt extraction (up to 15%), assisted and/or followed by pervasive, porous flow infiltration of alkaline melts in a relatively large porosity region, leading to the creation of a wide area rich in secondary mineral phases (i.e. olivine, clinopyroxene and pargasitic amphibole), enriched in incompatible elements (e.g., LaN/YbN in clinopyroxene up to 15) and having radiogenic Sr and unradiogenic Nd; 3) websterites and wehrlite-bearing samples that record differentiation processes of alkaline melts highly enriched in Th, U and LREE, not yet documented in the erupted volcanics of northern Madagascar. The mantle xenoliths of northern Madagascar show a regional decrease of the equilibration temperature from to SW (up to 1180 °C, Nosy Be Archipelago) to the NE (up to 900 °C, Bobaomby district). A significant lithologic and geochemical variation of the shallow lithospheric mantle beneath northern Madagascar is noted, in contrast with the relatively uniform geochemical and isotopic composition of the host alkali basalt and basanite lavas.
DS201711-2531
2017
Zanetti, M.R.Timms, N.E., Erickson, T.M., Zanetti, M.R., Pearce, M.A., Cayron, C., Cavosie, A.J., Reddy, S.M., Wittman, A., Carpenter, P.K.Cubic zirconia in >2370 C impact melt records Earth's hottest crust.Earth and Planetary Science Letters, Vol. 478, pp. 52-58.Canada, QuebecMistastin crater

Abstract: Bolide impacts influence primordial evolution of planetary bodies because they can cause instantaneous melting and vaporization of both crust and impactors. Temperatures reached by impact-generated silicate melts are unknown because meteorite impacts are ephemeral, and established mineral and rock thermometers have limited temperature ranges. Consequently, impact melt temperatures in global bombardment models of the early Earth and Moon are poorly constrained, and may not accurately predict the survival, stabilization, geochemical evolution and cooling of early crustal materials. Here we show geological evidence for the transformation of zircon to cubic zirconia plus silica in impact melt from the 28 km diameter Mistastin Lake crater, Canada, which requires super-heating in excess of 2370?°C. This new temperature determination is the highest recorded from any crustal rock. Our phase heritage approach extends the thermometry range for impact melts by several hundred degrees, more closely bridging the gap between nature and theory. Profusion of >2370?°C superheated impact melt during high intensity bombardment of Hadean Earth likely facilitated consumption of early-formed crustal rocks and minerals, widespread volatilization of various species, including hydrates, and formation of dry, rigid, refractory crust.
DS1990-0409
1990
ZangDobbs, P.N., Guo Yaping, Hu Siyi, Lin Jianrong, Luo Lianquan, ZangA sedimentological study of Diamondiferous Quaternary sediments in southern Shandong ChinaGeol. Journal, Vol. 25, pp. 47-59ChinaSedimentology, Diamond sediments
DS200912-0864
2009
Zang, C.Zhou, S., Zang, C., Ma, H., Li, X., Zhang, H., Jia, X.Study on growth of coarse grains of diamond with high quality under HPHT.Chinese Science Bulletin, Vol. 54, 1, pp. 163-167.TechnologyUHP
DS200512-1231
2005
Zang, C.Y.Zang, C.Y., Jia, X.P., Ma, H.A., Tian, Y., Xiao, H.Y.Effect of regrown graphite on the growth of large gem diamonds by temperature gradient method.Chinese Physics Letters , Vol. 22, 9, pp. 2415-2417.TechnologyDiamond morphology
DS201902-0325
2018
Zang, J-H.Su, L-X., Zhao, C-X., Lou, Q., Chun-Yao, F., Li, Z., Shen, C-L., Zang, J-H., Jia, X-P., Shan, C-X.Efficient phosphorescence from synthetic diamonds.Carbon, Vol. 130, 1, pp. 384-389.Globalsynthetics

Abstract: Synthetic diamonds have inspired much interest for their unique photophysical properties and versatile potential applications, but their phosphorescent phenomenon and mechanism have been paid much less attention. Here, phosphorescent diamonds with a lifetime of 5.4?s were synthesized by high-pressure and high-temperature method, and the diamonds exhibit an emission band at around 468?nm under the excitation wavelength of 230?nm. The quantum yield of the phosphorescent diamonds is about 4.7% at ambient temperature and atmosphere, which is the first report on the quantum yield of diamonds. The unique phosphorescence emission can be attributed to the radiative recombination from iron related donors and boron related acceptors.
DS201712-2683
2017
Zang, Q.Deng, M., Xu, C., Song, W., Tang, H., Liu, Y., Zang, Q., Zhou, Y., Feng, M., Wei, C.REE mineralization in the Bayan Obo deposit, China: evidence from mineral paragenesis.Ore Geology Reviews, in press available, 10p.Chinadeposit - Bayan Obo

Abstract: Preliminary mineralogical and geochemical studies have been carried out on dolomite marble drill cores from the Bayan Obo REE deposit in China. Three types of apatites and four types of monazites have been identified based on textural features: Type 1 apatite occurs as grains with minor monazite (Type 1 monazite) on its border; Type 2 apatite veinlet shows clusters of assemblages with abundant bastnäsite and parisite at the rim; Type 3 apatite has a linear array associated with fluorite and bastnäsite veinlets. Type 2 monazite occurs as clusters intergrowing with parisite and fluorite. Type 3 and 4 monazites occur as polymineralic (fluorite and bastnäsite) and monomineralic veinlets, respectively. These four types of monazites have similar LREE composition but variable Y content (Y2O3 ranging from below determination limits to 0.7?wt%). The three types of apatites also show different REE content and distribution patterns, ranging from high REE abundance (?REE?+?Y: 27243-251789?ppm) and strong LREE enrichment [(La/Yb)CN ~101] in Type 1, less LREE enrichment [(La/Yb)CN ~8] in Type 2 to relatively low REE abundance (?REE?+?Y: 4323-11175?ppm) but high REE fractionation [(La/Yb)CN ~58] in Type 3. The primary apatite has high Sr (5461-6892?ppm) and REE content, implying a carbonatite origin. The late-stage apatites (Types 2 and 3) show different Sr and REE abundances. Significant differences in their Sr composition (6189?±?573, 6041?±?549 and 3492?±?802 for Types 1-3 samples, respectively) and Y/Ho ratio (20.9?±?0.11, 19.5?±?0.17 and 17.4?±?0.37, respectively) indicate that the three types of apatites may have crystallized from different metasomatic fluids. Multi-stage metasomatism resulted in remobilization and redeposition of primary REE minerals to form the Bayan Obo REE deposit.
DS2003-0658
2003
Zang, S.X.Jing, Z.C., Ning, J.Y., Wang, S.G., Zang, S.X.Dynamic phase boundaries of olivine wadsleyite in subduction zones in the westernGeophysical Research Letters, Vol. 29, 22, Nov. 15, DOI 10.1029/2001GLO13810GlobalSubduction
DS1992-1701
1992
Zang AndiWu Jianshan, Geng Yuansheng, Tang Lianjiang, Zang AndiRelationship of Diamondiferous kimberlites with tectonic setting of basement in Sino-Korean PlatformRussian Geology and Geophysics, Vol. 33, No. 10, 5p.ChinaStructure, Sino-Korean Platform
DS1999-0824
1999
Zangana, N.A.Zangana, N.A., Downes, H., Bea, F.Geochemical variation in peridotite xenoliths and their constituent clinopyroxenes from Ray Pic: implicationsChemical Geology, Vol. 153, No. 1-4, Jan. pp. 11-36.Europe, French Massif CentralMantle - shallow lithosphere
DS1995-2119
1995
Zank, N.S.Zank, N.S.Privatizing the minerals sectorNatural Resources forum, Vol. 19, No. 3, Aug. 1, pp. 215-222GlobalEconomics, Legal -privatization
DS1995-0548
1995
Zankovich, N.S.Fomin, A.S., Serenko, V.P., Zankovich, N.S.Two phase pipes of the Yakutian Diamondiferous provinceProceedings of the Sixth International Kimberlite Conference Almazy Rossii Sakha abstract, p. 6.Russia, YakutiaAutoliths, Deposit -Daldyn Alakit, Malo Botuobiya, Malokuonamka
DS1995-2120
1995
Zankovich, N.S.Zankovich, N.S.One criterion for the determination of the phases of kimberlite rocks from Yakutian pipes: autolithProceedings of the Sixth International Kimberlite Conference Almazy Rossii Sakha abstract, p. 5.Russia, YakutiaAutoliths, Deposit -Daldyn Alakit
DS201812-2856
2019
Zanon, V.Nazzarini, S., Nestola, F., Zanon, V., Bindi, L., Scricciolo, E., Petrelli, M., Zanatta, M., Mariotto, G., Giuli, G.Discovery of moissanite in a peralkaline syenite from the Azores Islands.Lithos, Vol. 324-325, pp. 68-73.Europe, Portugal, Azoresmoissanite

Abstract: Our discovery of moissanite grains in a peralkaline syenite from the Água de Pau Volcano (São Miguel, Azores Islands, Portugal) represents the first report of this mineral in present day oceanic geodynamic settings. Raman spectroscopy and single-crystal X-ray diffraction show the presence of both the 6H and 4H polytypes with the predominance of the first one. The distribution of trace elements is homogeneous, except for Al and V. Azorean moissanite often hosts rounded inclusions of metallic Si and other not yet identified metallic alloys. A process involving a flushing of CH4-H2 ultra-reducing fluids in the alkaline melts might be considered as a possible mechanism leading to the formation of natural SiC, thus calling for strongly reducing conditions that were locally met in the crust-mantle beneath the São Miguel Island.
DS201902-0302
2019
Zanon, V.Nazzarini, S., Nestola, F.,Zanon, V., Bindi, L., Giuli, G.Discovery of moissanite in a peralkaline syenite from the Azores Islands.Lithos, Vol. 324, pp. 68-73.Europe, Portugal, Azoresmoissanite

Abstract: Our discovery of moissanite grains in a peralkaline syenite from the Água de Pau Volcano (São Miguel, Azores Islands, Portugal) represents the first report of this mineral in present day oceanic geodynamic settings. Raman spectroscopy and single-crystal X-ray diffraction show the presence of both the 6H and 4H polytypes with the predominance of the first one. The distribution of trace elements is homogeneous, except for Al and V. Azorean moissanite often hosts rounded inclusions of metallic Si and other not yet identified metallic alloys. A process involving a flushing of CH4-H2 ultra-reducing fluids in the alkaline melts might be considered as a possible mechanism leading to the formation of natural SiC, thus calling for strongly reducing conditions that were locally met in the crust-mantle beneath the São Miguel Island.
DS1970-0457
1971
Zanone, L.Zanone, L.Bibliography of the Geology and Mining Research in the Ivory Coast, 1855-1970.Abidjan: Soc. Pour Le Developpement Minier De la Cote D'ivoi, West Africa, Ivory CoastBibliography, Kimberley
DS201810-2391
2018
Zaporozan, T.Zaporozan, T., Fredericksen, A.W., Bryksin, A., Darbyshire, F.Surface wave images of western Canada: lithographic variations across the Cordillera craton boundary.Canadian Journal of Earth Sciences, Vol. 55, pp. 887-896.Canada, Northwest Territories, Alberta, Saskatchewangeophysics - seismic

Abstract: Two-station surface-wave analysis was used to measure Rayleigh-wave phase velocities between 105 station pairs in western Canada, straddling the boundary between the tectonically active Cordillera and the adjacent stable craton. Major variations in phase velocity are seen across the boundary at periods from 15 to 200 s, periods primarily sensitive to upper mantle structure. Tomographic inversion of these phase velocities was used to generate phase velocity maps at these periods, indicating a sharp contrast between low-velocity Cordilleran upper mantle and high-velocity cratonic lithosphere. Depth inversion along selected transects indicates that the Cordillera-craton upper mantle contact varies in dip along the deformation front, with cratonic lithosphere of the Taltson province overthrusting Cordilleran asthenosphere in the northern Cordillera, and Cordilleran asthenosphere overthrusting Wopmay lithosphere further south. Localized high-velocity features at sub-lithospheric depths beneath the Cordillera are interpreted as Farallon slab fragments, with the gap between these features indicating a slab window. A high-velocity feature in the lower lithosphere of the Slave province may be related to Proterozic or Archean subduction.
DS2000-0843
2000
Zappettini, E.O.Rubiolo, D.G., Zappettini, E.O.Mesozoic alkaline plutonism in the Central Andes of Northwestern ArgentinaIgc 30th. Brasil, Aug. abstract only 1p.ArgentinaTectonics, rifting, Carbonatite
DS1975-0216
1975
Zara, L.Zara, L.Rhodes. the Colossus of AfricaMiner. Digest (usa), Vol. 7, PP. 64-73.South AfricaHistory, Biography
DS201212-0611
2012
Zarate, M.Rutter, N., Coronato, A.,Helmens, K., Rabassa, J., Zarate, M.Glaciations in North and South America from the Miocene to the last glacial maximum.Springer, Book adUnited States, Canada, South AmericaGeomorphology
DS2001-1292
2001
Zarcan International Resources IncZarcan International Resources IncParauna diamond and gold property, environmental permit for mining receivedZarcan International, May 15, 2p.Brazil, Minas GeraisNews item, Diamantina Diamond Field
DS1960-0393
1963
Zaretskii, L.M.Rozhkov, I.S., Mikhalev, G.P., Zaretskii, L.M.Diamond Deposits of the Malo-botuobiya Region of Southern Yakutia.Moscow: Izdat Nauka., 138P.Russia, YakutiaKimberlite, Diamond, Kimberley
DS1991-1920
1991
Zarharchenko, O.D.Zarharchenko, O.D., Kharkiv, A.D., Botova, M.M., Makhin, A.I.Inclusions of plutonic minerals in diamonds from kimberlite rocks of the northern east European PlatformProceedings of Fifth International Kimberlite Conference held Araxa June 1991, Servico Geologico do Brasil (CPRM) Special, pp. 579-580RussiaDiamond inclusions, Olivine, coesite, chrome-spinellid
DS201809-2040
2018
Zaripov, N.R.Ignatov, P.A., Novikov, K.V., Shmonov, A.M., Zaripov, N.R., Khodnya, M.S., Razumov, A.N., Kilishekov, O.K., Kryazhev, S.G., Kovalchuk, O.E.Zoning of faults and secondary mineralization of host rocks of kimberlites of the Maiscoe diamond deposit, Nakyn field, Yakutia.Geology of Ore Deposits, Vol. 60, 3, pp. 201-209.Russiadeposit - Maiscoe
DS1995-0292
1995
Zaritski, A.I.Chaska, A.I., Bobrievich, A.P., Zaritski, A.I., et al.Kimberlite magmatism of the UkraineProceedings of the Sixth International Kimberlite Conference Extended Abstracts, p. 104-105.UKrainePriazovski Near Azov, North Volyn, Petrovskoe, Nadiya, Yuzhnaya, Novolaspinskaya
DS1982-0435
1982
Zaritskiy, A.I.Metalidi, S.V., Zaritskiy, A.I., Tsymbal, S.N., et al.First Discovery of Diamonds in Upper Proterozoic Conglomerates of East European PlatformMineral. Zhurnal, Vol. 4, No. 3, PP. 20-29.RussiaMineralogy, Spectra, Luminescence
DS1995-0163
1995
Zarr, A.Boehler, R., Chopelas, A., Zarr, A.Temperature and chemistry of the core-mantle boundaryChemical Geology, Vol. 120, No. 3-4, March 1, pp. 199-206.MantleBoundary, Geochemistry
DS202008-1451
2020
Zartmam, R.Sun, W-D., Zhang, L-p., Xie, G-z., Hawkesworth. C., Zartmam, R.Carbonatite formed through diamond oxidation.Goldschmidt 2020, 1p. AbstractMantlecarbonatite

Abstract: Carbonatite is a magmatic rock with high carbonate and low silicate contents, which mostly originate in the mantle. It is therefore of critical importance to understand the behavior of carbon in the mantle, and consequently deep carbon recycling. However, the formation of carbonatite is largely unresolved. In particular, the source of carbonatite the carbonate remains obscure. Previous studies showed that the solidus of carbonated mantle peridotite was lower than the Earth’s geotherm in the Archean and the Early Proterozoic era, before ~1.4 Ga ago. Therefore, the mantle should have been severely decarbonated early in Earth’s history. This is consistent with the low carbon abundance in the asthenospheric mantle (~100 ppm), as indicated by low carbonate concentrations in mid-ocean ridge basalts. Consequently, carbonate in young mantle must have been mostly obtained in the post-Archean era by two processes. These are either oxidation of diamond in the mantle or recycling of sedimentary carbonates through plate subduction. Here we show that the Sr and Nd isotope variations in carbonatite may be plausibly explained by mixing of three endmembers, (1) recycled sedimentary carbonates, (2) depleted mantle, and (3) a low Sr and Nd isotopes endmember. The low Sr, Nd carbonate reservoirs for carbonatites of different ages plot roughly on the evolution line of the primitive mantle, suggesting that they were successively released from a well-preserved, non-carbonate mantle source. The preferred candidate for this endmember is carbonate formed through oxidation of diamond by ferric ion released through decomposition of bridgmanite, which is carried up from the lower mantle via background upwelling, compensational to the volume of oceanic slabs penetrating into the lower mantle1.
DS2001-0586
2001
ZartmanKempton, P.D., Downes, Neymark, Wartho, Zartman, SharkovGarnet granulite xenoliths from the northern Baltic Shield - the underplated lower crust of a paleoprot...Journal of Petrology, Vol. 42, No. 4, Apr. pp. 731-64.Baltic Shield, Kola PeninsulaIgneous Province, Geochronology
DS200712-0559
2007
Zartman, R.Kogarko, N.L., Zartman, R.Isotopic signatures of the Siberian flood basalts and alkaline magmatism of Polar Siberia ( age, genetic link, heterogeneity of mantle sources).Plates, Plumes, and Paradigms, 1p. abstract p. A503.Russia, SiberiaGeochronology
DS1960-0899
1967
Zartman, R.E.Zartman, R.E., Brock, M.E., Heyl, A.V., Thomas, H.H.Potassium-argon and Rubidium-strontium Ages of Some Alkaline Intrusive rocks from Central and Eastern United States.American Journal of Science, VOL 265, PP. 838-870.United States, Appalachia, New York, Central StatesGeology, Related Rocks, Kimberlite, Geochronology
DS1975-0657
1977
Zartman, R.E.Zartman, R.E.Geochronology of Some Alkalic Rock Provinces in Eastern And central United States.Annual Review of Earth and Planetary Science, Vol. 5, PP. 257-386.United States, Gulf Coast, Arkansas, Appalachia, KentuckyGeochronology, Related Rocks, Kimberlite
DS1983-0529
1983
Zartman, R.E.Rankin, D.W., Stern, T.W., Mclelland, J., Zartman, R.E., Odom, A.Correlation Chart for Precambrian Rocks of the Eastern United States.United States Geological Survey (USGS) PROF. PAPER., No. 1241-E, 18P.GlobalMid-continent
DS1985-0524
1985
Zartman, R.E.Peterman, Z.E., Zartman, R.E.The Early Proterozoic Trans-hudson Orogen in the Northern Great Plains of the United States.6th. International Conference Basement Tectonics, Held Sante Fe, Septem, P. 30. (abstract.).United States, Rocky Mountains, North Dakota, South Dakota, Montana, WillisGeotectonics
DS1985-0761
1985
Zartman, R.E.Zartman, R.E., Howard, J.M.Uranium-thorium-lead AGES of LARGE ZIRCON CRYSTALS from the POTASH SULFUR SPRINGS IGNEOUS COMPLEX, GARLAND COUNTY, Arkansaw.Geological Society of America (GSA), Vol. 17, P. 198. (abstract.).United States, Gulf Coast, Arkansas, Garland CountyGeochronology
DS1987-0154
1987
Zartman, R.E.Dewitt, E., Kwak, L.M., Zartman, R.E.Uranium-thorium-lead (U-Th-Pb) and 40Ar/39Ar dating of the Mountain Pass carbonatite and alkalic igneous rocks, southeast CaliforniaGeological Society of America, Vol. 19, No. 7 annual meeting abstracts, p.642. abstracCaliforniaShonkinite, Rare earths
DS1987-0828
1987
Zartman, R.E.Zartman, R.E., Howard, M.Uranium lead age of large zircon crystals from the Potash Sulfur Springs igneous complex, Garland County, ArkansawMantle metasomatism and alkaline magmatism, edited E. Mullen Morris and, No. 215, pp. 235-240ArkansasBlank
DS1988-0204
1988
Zartman, R.E.Evans, K.V., Zartman, R.E.Early Paleozoic alkalic plutonism in east central IdahoGeological Society of America (GSA) Bulletin, Vol. 100, No. 12, December pp. 1981-1987IdahoAlkaline rocks
DS1990-1150
1990
Zartman, R.E.Paces, J.B., Zartman, R.E., Taylor, L.A., Futa, K., Kwak, L.M.lead isotopic evidence for multiple episodes of lower crustal growth and modification in granulite nodules from the Superior Province, MichiganGeological Society of America (GSA) Annual Meeting, Abstracts, Vol. 22, No. 7, p. A119Michigan, MidcontinentGeochronology, Granulite nodules
DS1991-1921
1991
Zartman, R.E.Zartman, R.E., Futa, K., Peng, Z.C.A comparison of Sr-Neodymium-Palladium isotopes in young and old continental lithosphericmantle: Patagonia and eastern ChinaAustralian Journal of Earth Science, Vol. 38, pp. 545-557China, South AmericaMantle, Geochronology
DS1992-0704
1992
Zartman, R.E.Hermes, O.D., Zartman, R.E.Late Proterozoic and Silurian alkaline plutons within the southeastern New England Avalon ZoneJournal of Geology, Vol. 100, pp. 477-486GlobalAlkaline rocks
DS1997-1291
1997
Zartman, R.E.Zartman, R.E., Nicholson, S.W., Cannon, W.F., Morey, G.B.Uranium-thorium-lead-zircon ages of some Keweenawan Supergroup rocks from the south shore of Lake SuperiorCanadian Journal of Earth Sciences, Vol. 34, No. 4, April, pp. 549-561Michigan, WisconsinGeochronology
DS1998-0504
1998
Zartman, R.E.Ghosh, J.G., Zartman, R.E., De Wit, M.J.Re-evaluation of tectonic framework of southern most India: new uranium-lead (U-Pb)geochronological and structural data.Journal of African Earth Sciences, Vol. 27, 1A, p. 86. AbstractIndia, southTectonics - not specific to diamonds, Geochronology
DS1998-1623
1998
Zartman, R.E.Zartman, R.E., Richardson, S., Gurney, J.J., Moore, R.Uranium-thorium-lead ages of megacrystic zircon from the Monastery kimberlite, FreeState, South Africa.7th International Kimberlite Conference Abstract, pp. 989-91.South AfricaGeochronology, tectonics, Deposit - Monastery
DS2001-0338
2001
Zartman, R.E.Frimmel, H.E., Zartman, R.E., Spath, A.The Richtersveld igneous complex: uranium-lead (U-Pb) zircon and geochemical evidence for beginning Neoproterozoic...Journal of Geology, Vol. 109, pp. 493-508.South AfricaContinental breakup, Geotectonics
DS2001-0664
2001
Zartman, R.E.Le Roex, A.P., Spath, A., Zartman, R.E.Lithospheric thickness beneath the southern Kenya Rift: implications from basalt geochemistry.Contributions to Mineralogy and Petrology, Vol. 142, No. 1, Oct. pp.89-106.Kenya, southern AfricaGeochemistry - basalt
DS200512-1232
2005
Zartman, R.E.Zartman, R.E., Richardson, S.H.Evidence from kimberlitic zircon for a decreasing mantle Th/U since the Archean.Chemical Geology, Vol. 220, 3-4, pp. 263-283.MantleGeochronology
DS201112-0532
2011
Zartman, R.E.Kogarko, L.N., Zartman, R.E.A Pb isotope investigation of the Guli Massif, Maymecha Kotuy alkaline ultramafic complex, Siberian flood basalt province, Polar Siberia.Deep Seated Magmatism, its sources and plumes, Ed. Vladykin, N.V., pp. 76-95.Russia, SiberiaMetasomatism, geochronology
DS201312-1005
2013
Zartman, R.E.Zartman, R.E., Kempton, P.D., Kempton, J.B., Paces, H.D., Williams, I.S., Dobosi, G.,Futa, K.Lower crustal xenoliths from Jurassic kimberlite diatremes, Upper Michigan USA: evidence for Proterozoic orogenesis and plume magmatism in the lower crust of the southern Superior Province.Journal of Petrology, Vol. 54, 3, pp. 575-608.United States, MichiganDeposit - Lake Ellen, S69, S10
DS201412-1021
2014
Zartman, R.E.Zartman, R.E., Kogarko, L.N.A Pb isotope investigation of the Lovozero agpaitic nepheline syenite, Kola Peninsul, Russia.Doklady Earth Sciences, Vol. 453, 1, pp. 25-28.Russia, Kola PeninsulaGeochronology
DS201705-0891
2017
Zartman, R.E.Zartman, R.E., Kogarko, L.N.Lead isotopic evidence for interaction between plume and lower crust during emplacement of peralkine Lovozero rocks and related rare-metal deposits, East Fennoscandia, Kola Peninsula, Russia.Contributions to Mineralogy and Petrology, Vol. 172, 32p.Russia, Kola PeninsulaCarbonatite

Abstract: The Lovozero alkaline massif—an agpaitic nepheline syenite layered intrusion—is located in the central part of the Kola Peninsula, Russia, and belongs to the Kola ultramafic alkaline and carbonatitic province (KACP) of Devonian age. Associated loparite and eudialyte deposits, which contain immense resources of REE, Nb, Ta, and Zr, constitute a world class mineral district. Previous Sr, Nd, and Hf isotope investigations demonstrated that these rocks and mineral deposits were derived from a depleted mantle source. However, because the Sr, Nd, and Hf abundances in the Kola alkaline rocks are significantly elevated, their isotopic compositions were relatively insensitive to contamination by the underlying crustal rocks through which the intruding magmas passed. Pb occurring in relatively lower abundance in the KACP rocks, by contrast, would have been a more sensitive indicator of an acquired crustal component. Here, we investigate the lead isotopic signature of representative types of Lovozero rocks in order to further characterize their sources. The measured Pb isotopic composition was corrected using the determined U and Th concentrations to the age of the crystallization of the intrusion (376?±?28 Ma, based on a 206Pb/204Pb versus 238U/204Pb isochron and 373?±?9 Ma, from a 208Pb/204Pb versus 232Th/204Pb isochron). Unlike the previously investigated Sr, Nd, and Hf isotopes, the lead isotopic composition plot was well outside the FOZO field. The 206Pb/204Pb values fall within the depleted MORB field, with some rocks having lower 207Pb/204Pb but higher 208Pb/204Pb values. Together with other related carbonatites having both lower and higher 206Pb/204Pb values, the combined KACP rocks form an extended linear array defining either a?~2.5-Ga secondary isochron or a mixing line. The projection of this isotopic array toward the very unradiogenic composition of underlying 2.4-2.5-Ga basaltic rocks of the Matachewan superplume and associated Archean granulite facies country rock provides strong evidence that this old lower crust was the contaminant responsible for the deviation of the Lovozero rocks from a presumed original FOZO lead isotopic composition. Evaluating the presence of such a lower crustal component in the Lovozero rock samples suggests a 5-10% contamination by such rocks. Contamination by upper crustal rock is limited to only a negligible amount.
DS2001-0585
2001
Zartman SharkovKempton, P.D., Downes, Neymark, Wartho, Zartman SharkovGarnet granulite xenoliths from the Northern Baltic Shield - underplated lower crust of paleoproterozoic ..Journal of Petrology, Vol. 42, No. 4, pp. 731-63.Russia, Kola Peninsula, Baltic ShieldLarge igneous province, Metasomatism, geochronology
DS200612-0421
2006
Zarubin, B.Galimov, E., Kudin, A., Skorobogatskii, V., Plotnichenko, V., Bondarev, O., Zarubin, B., Strazdovskii, V., Aronin, A., Fisenko, A., Bykov, I., Barinov, A.Experimental corrobation of the synthesis of diamond in the cavitation process.Doklady Physical Chemistry, Vol. 49, 3, pp. 150-153.TechnologyDiamond synthesis
DS201012-0824
2010
Zarubina, N.V.Vovna, G.M., Mishkin, M.A., Sakhno, V.G., Zarubina, N.V.Early Archean sialic crust of the Siberian craton: the composition and origin of magmatic protoliths.Doklady Earth Sciences, Vol. 429, 2, pp. 1439-1442.RussiaMagmatism
DS1991-0473
1991
Zarudnev, N.V.Fefelov, N.N., Kostrovlisky, S.I., Zarudnev, N.V.lead isotope composition and lead-lead age of kimberlites of Siberia.(Russian)Doklady Academy of Sciences Akademy Nauk SSSR, (Russian), Vol. 320, No. 6, pp. 1466-1469. # HB276Russia, SiberiaGeochronology, Kimberlites
DS1992-0451
1992
Zarudneva, N.V.Fefelov, N.N., Kostrovitskii, S.I., Zarudneva, N.V.Lead isotope composition in Russian kimberlitesSoviet Geology and Geophysics, Vol. 33, No. 11, pp. 85-90.RussiaGeochronology
DS1994-0509
1994
Zarudneva, N.V.Fefelov, N.N., Kostrovitskiy, S.I., Zarudneva, N.V.Isotopic composition of lead and its use to date Siberian kimberlitesDoklady Academy of Sciences USSR, Earth Science Section, Vol. 321A, No. 9, January pp. 186-189.Russia, SiberiaGeochronology, Kimberlites
DS201702-0234
2016
Zarza-Lima, P.R.Presser, J.L.B., Farina-Dolsa, S., Larroza-Cristaldo, F.A., Rocca, M., Alonso, R.N., Acededo, R.D., Cabral-Antunez, N.D., Baller, L., Zarza-Lima, P.R., Sekatcheff, J.M.Modeled mega impact structures in Paraguay: II the eastern region. **PortBoletin del Museo Nacional de Historia Narural del Paraguay, Vol. 20, 2, pp. 205-213. pdf available in * PortSouth America, ParaguayImpact Crater

Abstract: We report here the discovery and study of several new modeled large impact craters in Eastern Paraguay, South America. They were studied by geophysical information (gravimetry, magnetism), field geology and also by microscopic petrography. Clear evidences of shock metamorphic effects were found (e.g., diaplectic glasses, PF, PDF in quartz and feldspar) at 4 of the modeled craters: 1) Negla: diameter:~80-81 km., 2) Yasuka Renda D:~96 km., 3) Tapyta, D: ~80 km. and 4) San Miguel, D: 130-136 km. 5) Curuguaty, D: ~110 km. was detected and studied only by geophysical information. Target-rocks range goes from the crystalline Archaic basement to Permian sediments. The modeled craters were in some cases cut by tholeiitic/alkaline rocks of Mesozoic age and partially covered by lavas of the basaltic Mesozoic flows (Negla, Yasuka Renda, Tapyta and Curuguaty). One of them was covered in part by sediments of Grupo Caacupé (age: Silurian/Devonian). Some of these modeled craters show gold, diamonds, uranium and REE mineral deposits associated. All new modeled large impact craters are partially to markedly eroded.
DS1990-1146
1990
Zashu, M.Ozima, M., Zashu, M., Tomura, K.Crustal origin of carbonado (diamond) noble gas evidenceEos, Vol. 71, No. 43, October 23, p. 1708 AbstractGlobalCarbonado, Diamond -noble gas
DS1983-0498
1983
Zashu, S.Ozima, M., Zashu, S., Nitoh, O.3 He 4he Ratio, Noble Gas Abundance and Potassium-argon Dating of Diamonds - an Attempt to Search for the Records of Early Terrestrial History.Geochimica et Cosmochimica Acta ., Vol. 47, No. 12, DECEMBER PP. 2217-2224.GlobalGeochronology, Diamonds, Genesis, Helium
DS1984-0572
1984
Zashu, S.Ozima, M., Takaoka, M., Nito, O., Zashu, S.Argon isotopic ratios and Potassium, Sodium and other trace element contents in Premier and Finsch mine diamonds contents in Premier and Finsch mine diamondsIn: Material Science of the Earth's interiors, Terra Science Publishing, pp. 375-386South AfricaDiamond Morphology, Geochronology, Isotope
DS1984-0573
1984
Zashu, S.Ozima, M., Zashu, S.Primitive 3He/4He ratio in terrestrial diamonds and its implication on the origin of noble gases in terrestrial planetsIn: Proceedings of the 27th. International Geological Congress held Moscow, August, Vol. 11, Geochemistry and Cosmochemistry pp. 219-232GlobalDiamond Morphology, Helium
DS1984-0790
1984
Zashu, S.Zashu, S., Ozina, M.An Attempt to Date Some of the Diamonds by K-ar Isochron Methods.Journal of Geography (japan), Vol. 93, No. 7, (866) PP. 116-121.Central Africa, ZaireDiamonds, Geochronology, Inclusions
DS1985-0509
1985
Zashu, S.Ozima, M., Zashu, S., Mattey, D.P., Pillinger, C.T.Helium, argon and carbon isotopic compositions in diamonds and theirapplications in mantle evolution.*JAPGeochem. Journal, *JAP, Vol. 19, No. 3, pp. 127-134GlobalDiamond Morphology
DS1985-0510
1985
Zashu, S.Ozima, M., Zashu, S., Mattey, D.P., Pillinger, C.T.Helium, Argon and Carbon Isotopic Compositions in Diamonds And Their Implications in Mantle Evolution.Geochemical Journal, Vol. 19, No. 3, PP. 127-134.GlobalGeochronology, Diamond Morphology
DS1986-0891
1986
Zashu, S.Zashu, S., Ozima, M., Hitoh, O.K-Ar isochron dating of Zaire cubic diamondsNature, Vol. 323, No. 6090 October 23, pp. 710-712Democratic Republic of CongoGeochronology
DS1986-0892
1986
Zashu, S.Zashu, S., Ozima, M., Nitoh, O.Potassium argon isochron dating of Zaire cubic diamondsNature, Vol. 323, No. 6090, pp. 71-712Democratic Republic of CongoDiamond, Geochronology
DS1989-1162
1989
Zashu, S.Ozima, M., Zashu, S., Boyd, S.R.Noble gas isotopic composition in coated diamonds:representative of The upper and lower mantle?Diamond Workshop, International Geological Congress, July 15-16th. editors, pp. 80-82. AbstractDemocratic Republic of CongoMantle, Geochronology
DS1989-1163
1989
Zashu, S.Ozima, M., Zashu, S., Takigami, Y., Turner, G.Origin of the anomalous Ar 40-Ar 39 age of Zaire cubic diamonds- excess Ar 40 in pristine mantle fluidsNature, Vol. 337, No. 6204, Jan. 19, pp. 226-229Democratic Republic of CongoMantle, Argon, Geochronology
DS1990-1147
1990
Zashu, S.Ozima, M., Azuma, S., Zashu, S., Hiyagon, H.224 Pu Fissiogenic Xe in mantle21st. Lunar And Planetary Science Conference, March 12-16, Houston, March 16 presentationGlobalMantle, Xenon
DS1990-1472
1990
Zashu, S.Tomeoka, K., Ozima, M., Zashu, S., Sato, S., Yazu, S.X-ray micro-analysis of micro-inclusions in a Zaire coated diamond21st. Lunar And Planetary Science Conference, March 12-16, Houston, March 16 presentationDemocratic Republic of CongoDiamond morphology, X-ray microscopy
DS1991-1279
1991
Zashu, S.Ozima, M., Zashu, S.Noble gas state of the ancient mantle as deduced from noble gases in coateddiamondsEarth and Planetary Science Letters, Vol. 105, pp. 13-27GlobalDiamond morphology, Diamond inclusions
DS1991-1280
1991
Zashu, S.Ozima, M., Zashu, S.Radiation induced diamond (carbonado)- a possible mechanism for the origin of diamond in primitive meteoritesMeteoritics, Vol. 26, No. 4, December p. 389-390GlobalMeteorites, Carbonado
DS1991-1281
1991
Zashu, S.Ozima, M., Zashu, S., Tomura, K., Matushi, Y.Constraints from mobile gas contents on the origin of carbonado diamondsNature, Vol. 351, No. 6326, June 6, pp. 472-474GlobalDiamond inclusions, Carbonado -gas
DS1995-2121
1995
Zashu, S.Zashu, S., Hiyagon, H.Degassing mechanisms of noble gases from carbonado diamondsGeochimica et Cosmochimica Acta ., Vol. 59, No. 7, pp. 1321-1328.Central AfricaUbangi area, Carbonados
DS1982-0653
1982
Zatkhey, R.A.Zatkhey, R.A., Khmelevskiy, V.A.Ekaterinite of Yakutia KimberlitesMineral. Zhurn., No. 4, PT. 5, PP. 70-75.RussiaMineralogy
DS1984-0781
1984
Zatkhey, R.A.Yagnyshev, B.S., Yagnysheva, T.A., Khmelevskiy, V.A., Zatkhey, R.A.Mineral composition pecularities of the lower Paleozoic rocks around kimberlite bodies, west Yakutia.(Russian)Mineral. Zhurn., (Russian), Vol. 38, No. 1, pp. 49-55RussiaBlank
DS1997-1292
1997
Zatman, S.Zatman, S., Bloxham, J.Torsional oscillations and the magnetic field within the Earth's coreNature, Vol. 388, Aug. 21, pp. 760-763.MantleGeophysics - magnetics
DS2001-1293
2001
Zatman, S.Zatman, S.Phase relations for high frequency core-mantle coupling and Earth's axial angular momentum budget.Physics of the Earth and Planetary Interiors, Vol. 128, No. 1-4, Dec. 10, pp. 163-78.MantleCore-mantle
DS2001-1294
2001
Zatman, S.Zatman, S.Phase relations for high frequency core mantle coupling and the Earth's axial angular momentum budget.Physics of the Earth and Planetary Interiors, Vol. 128, No. 1-4, pp. 163-78.MantleTectonics, Core mantle boundary
DS1998-0648
1998
Zatsev, A.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
DS1993-1808
1993
Zaug, J.M.Zaug, J.M., Abramson, E.H., Brown, J.M., Slutsky, L.J.Second velocites in olivine at earth mantle pressuresScience, Vol. 260, No. 5113, June 4, pp. 1487-1488.MantleOlivine
DS1985-0765
1985
Zaulichn, J.V.Zhurakovskii, E.A., Trefilov, V.I., Zaulichn, J.V., Savvakin, G.I.Electron energy spectrum pecularities in ultradispersive diamonds obtained from extremely nonequilibrium carbon plasma.(in Russian)Doklady Academy of Sciences Nauk USSR, (Russian), Vol. 284, No. 6, pp. 1360-1365RussiaGenesis, Diamond Morphology
DS1985-0766
1985
Zaulichnyi, YA.V.Zhurakovskii, E.A., Zaulichnyi, YA.V.X-ray Quantum Yield Spectra in the Region of the Carbon absorption K Edge and Carbon Emission K Spectra of Graphite,lonsdaleite and Diamond.(russian)Fiz. Tverd. Tela, (Russian), Vol. 27, No. 11, pp. 3452-3455RussiaDiamond Morphology
DS1994-1021
1994
ZaunscherbLee, ZaunscherbDiamond exploration and production..Lee, Zaunscherb Mineral Resource INdustry Research, 3p.Colorado, Northwest Territories, Botswana, ZimbabweNews item -research report, Redaurum
DS201112-1154
2011
Zavada, P.Zavada, P., Dedecek, P., Mach, K., Lexa, O., Potuzak, M.Emplacement dynamics of phonolite magma into maar-diatreme structures - correlation of field, thermal modeling and AMS analogue modeling data.Journal of Volcanology and Geothermal Research, Vol. 201, 1-4, pp. 210-226.EuropeGeodynamics - not specific to diamonds
DS1984-0699
1984
Zavialova, L.L.Solovieva, L.V., Vladimirov, B.M., Zavialova, L.L., Barankevich.Deep Seated Inclusions of the Complex Type from the Udachnaia Kimberlite Pipe.Doklady Academy of Sciences AKAD. NAUK SSSR., Vol. 277, No. 2, PP. 461-466.RussiaBlank
DS1991-1632
1991
Zavjalova, L.L.Solovjeva, L.V., Zavjalova, L.L.Layered structure of the upper mantle beneath the Siberian platform:petrological and geophysical dataProceedings of Fifth International Kimberlite Conference held Araxa June 1991, Servico Geologico do Brasil (CPRM) Special, pp. 562-563RussiaXenoliths, Geophysics
DS1990-0993
1990
Zavodni, Z.M.Martin, D.C., Zavodni, Z.M.Use of percussion drilling information for pit slope designAmerican Institute of Mining, Metallurgical, and Petroleum Engineers (AIME) Preprint, No. 90-128, 9pGlobalMining, Drilling -pit slope design
DS1991-1909
1991
Zavyalov, L.L.Yegorov, K.N., Bogdanov, G.V., Zavyalov, L.L.New dat a on the kimberlite composition of the Zagadochnaya pipe(Yakut).(Russian)Izvest. Akad. Nauk SSS, Geol., (Russian), No. 11, November pp. 98-108Russia, YakutiaKimberlite, Zagadochnaya mineralogy
DS1986-0773
1986
Zavyalova, L.L.Solovyeva, L.V., Vladimirov, B.M., Zavyalova, L.L., Barankevich, V.V.Complex deep seated inclusions from the Udachnaya kimberlite pipeDoklady Academy of Science USSR, Earth Science Section, Vol. 277, March pp. 77-82RussiaYakutia, Analyses
DS1988-0654
1988
Zavyalova, L.L.Solovyeva, L.V., Barankevich, V.G., Zavyalova, L.L., Lipskaya, V.I.Metasomatic alterations in ferromagnesian eclogite from the UdachnayapipeDokl. Acad. Sciences USSR Earth Science Section, Vol. 303, No. 6, pp. 107-110RussiaEclogite, Alteration
DS201603-0390
2016
Zaw, K.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.
DS1991-1560
1991
Zayachkov, A.A.Shatskiy, V.S., Sobolev, N.V., Zayachkov, A.A., Zorin, Y.M.A new manifestation of micro-diamonds in metamorphic rocks as an evidence of the regional character of high-pressure metamorphism in KokchetavMassif.(in Russian)Doklady Academy of Sciences Akademy Nauk SSSR, (Russian), Vol. 321, No. 1, pp. 189-193. # HB124RussiaMicrodiamonds, Metamorphic rocks
DS200512-0622
2004
Zayachkovski, A.A.Letnikov, F.A., Kostitsyn, Yu.A., Vladykin, N.V., Zayachkovski, A.A., Mishina, E.I.Isotopic characteristics of the Krasnyi Mai ultramafic alkaline rock complex.Doklady Earth Sciences, Vol. 399A, 9, Nov-Dec. pp. 1315-1319.RussiaAlkalic
DS1981-0393
1981
Zayachkovskiy, A.A.Spetsius, Z.V., Zayachkovskiy, A.A., Gorokhov, S.S.Discovery of a Diamond Dniester Type in Eclogite Xenoliths with Some placers.Mineral. Sbornik L'vov, Vol. 35, No. 1, PP. 71-73.RussiaBlank
DS200412-1871
2003
ZayachkovskySobolev, N.V., Shatsky, V.S., Liou, J.G., Zhang, R.Y., Hwang, Shen, Chu, Yui, Zayachkovsky, KasymovAn origin of microdiamonds in metamorphic rocks of the Kokchetav Massif, northern Kazakhstan. US Russian civilian research andEpisodes, December, pp. 290-294.Russia, KazakhstanGenesis - microdiamonds
DS200512-0455
2004
ZayachkovskyHwang, S.L., Shen, P., Chu, H-T., Yui, T-F, Liou, J.G., Sobolev, N.V., Zhang, R-Y., Shatsky, V.S., ZayachkovskyKokchetavite: a new potassium feldspar polymorph from the Kokchetav ultrahigh pressure terrane.Contributions to Mineralogy and Petrology, Vol. 148, 3, pp. 380-RussiaUHP
DS1991-1561
1991
Zayachkovsky, A.A.Shatsky, V.S., Sobolev, N.V., Zayachkovsky, A.A., Zorin, Y.M., Vavtlov, M.A.New occurrence of microdiamonds in metamorphic rocks as a proof forDoklady Academy of Sciences Akademy Nauk SSSR, (Russian), Vol. 321, pp. 189-193.Russia, Commonwealth of Independent States (CIS)Microdiamonds, Metamorphic rocks
DS200612-0336
2006
Zayachkovsky, A.A.Dobretsov, N.I., Buslov, M.M., Zhimulev, F.I., Travin, A.V., Zayachkovsky, A.A.Vendian Early Ordovician geodynamic evolution and model for exhumation of ultrahigh and high pressure rocks from the Kokchetav subduction collision zone.Russian Geology and Geophysics, Vol. 47, 4, pp. 424-440.Russia, KazakhstanUHP
DS200612-1273
2006
Zayachkowsky, A.A.Shatsky, V.S., Sitnikova, E.S., Kozmenko, O.A., Palessky, S.V., Nikolaeva, I.V., Zayachkowsky, A.A.Behaviour of incompatible elements during ultrahigh pressure metamorphism. Kokchetav MassifRussian Geology and Geophysics, Vol. 47, 4, pp. 482-496.Russia, KazakhstanUHP - geochemistry
DS2002-0891
2002
Zayachokovosky, A.A.Korsakov, A.V., Shatsky, V.S., Sobolev, N.V., Zayachokovosky, A.A.Garnet biotite clinozoisite gneiss: a new type of Diamondiferous metamorphic rock from the Kokchetav Massif.European Journal of Mineralogy, Vol. 14, 5, pp. 915-28.RussiaDiamond genesis
DS1983-0434
1983
Zayakina, N.V.Marshintsev, V.K., Zayakina, N.V., Leskova, N.V.New Find of Cubic Silicon Carbide, As Inclusions in Moissanite from Kimberlitic Rocks.Doklady Academy of Science USSR, Earth Science Section., Vol. 262, No. 1-6, PP. 163-166.RussiaMineralogy
DS1993-0187
1993
Zayakina, N.V.Bulanova, G.P., Zayakina, N.V.A graphite cohenite iron mineral association in the core of a diamond From the Twenty Third Soviet Communist Party Congress PipeDoklady Academy of Sciences USSR, Earth Science Section, Vol. 317 A February Publishing date pp. 126-130Russia, YakutiaMineral inclusion, Deposit -Twenty Third
DS1995-1071
1995
Zayakina, N.V.Lazebik, K.A., Zayakina, N.V., Makhotko, V.F.A new thorium silicate from carbonatites at the Sirenevyy Kaman charoititedeposit.Doklady Academy of Sciences, Vol. 336, No. 4, Nov., pp. 97-101.Russia, YakutiaAlkaline rocks, Carbonatite -charoite
DS201602-0249
2015
Zayakina, N.V.Zayakina, N.V., Oleinikov, O.B., Vasileva, T.I., Oparin, N.A.Coalingite from kimberlite breccia of the Manchary pipe, central Yakutia.Geology of Ore Deposits, Vol. 57, 8, pp. 732-736.Russia, YakutiaDeposit - Manchary

Abstract: Coalingite, Mg10Fe2(CO3)(OH)24 • 2H2O, rare Mg -Fe hydrous carbonate, has been found in the course of the mineralogical study of a disintegrated kimberlite breccia from the Manchary pipe of the Khompu -May field located in the Tamma Basin, Central Yakutia, 100 km south of Yakutsk. Coalingite occurs as small reddish brown platelets, up to 0.2 mm in size. It is associated with lizardite, chrysotile and brucite, which are typical kimberlitic assemblage. Coalingite is a supergene mineral, but in this case, it is produced by the interaction of brucite-bearing kimberlite and underground water circulating through a vertical or oblique fault zone.
DS1988-0240
1988
Zayhowski, J.J.Geis, M.W., Rathman, D.D., Zayhowski, J.J., Smythe, D.L., SmithHomoepitaxial semiconducting diamondNational Technical Information Service AD-A202 349/7, 5p. $ A02 $ 10.95GlobalElectrical characteristics, Diamond
DS1991-0194
1991
Zayskina, N.V.Bulanova, G.P., Zayskina, N.V.The graphite cohenite native iron association in the central part of adiamond from the '23 Party Congress Pipe.(Russian)Doklady Academy of Sciences Akademy Nauk SSSR, (Russian), Vol. 317, No. 3, pp. 706-710RussiaMineralogy, Diamond inclusion
DS1981-0440
1981
Zaytsev, A.I.Zaytsev, A.I., Nikishov, K.N., et al.Isotopic Composition of Rubidium and Strontium in Xenoliths of Ultrabasic Rocks of Udachnaya Kimberlite Pipes.Izvest. Akad. Nauk Sssr, Geol. Ser., No. 4, PP. 28-36.RussiaGeochronology
DS1982-0654
1982
Zaytsev, A.I.Zaytsev, A.I., Nikishov, K.N., et al.Rubidium and Strontium Isotope Composition of Xenoliths of Ultrabasic Rocks from the Udachnaya Kimberlite Pipe.International Geology Review, Vol. 24, No. 5, PP. 559-566.RussiaBlank
DS1985-0762
1985
Zaytsev, A.I.Zaytsev, A.I., Nenashev, N.I., Nikishov, K.N.Evolution of the isotope composition of strontium in the kimberlite Rocks of Yakutia.(Russian)In: Petrologic and Geochemical Features of the Plutonic Evolution of, pp. 13-37.(Russian)RussiaBlank
DS1986-0893
1986
Zaytseva, T.M.Zaytseva, T.M., Gurkina, G.A.The nature of grey smoky and brown colour of diamond crystals.(Russian)Mineral. Zhurn., (Russian), Vol. 8, No. 3, pp. 48-52RussiaDiamond, Morphology
DS1989-1677
1989
Zaytseva, T.M.Zaytseva, T.M., Konstantinova, A.F.Anisotropy of optical properties of natural diamonds. (Russian)Mineral. Zhurnal., (Russian), Vol. 11, No. 5, pp. 68-73RussiaDiamond morphology, Luminescence
DS1985-0549
1985
Zazhardova, V.R.Prokopchuk, B.I., Argunov, K.P., Boris, Y.I., Zazhardova, V.R.Seperation of Diamonds in Placer Deposits. (russian)Soviet Geology, (Russian), No. 3, pp. 43-57RussiaPlacers
DS201112-1155
2011
Zbrozek, M.C.Zbrozek, M.C., Gonzales, D.A.Insight into the volatile histories of magmas of the Navajo volcanic field using oxygen and carbon isotopes.Geological Society of America, Annual Meeting, Minneapolis, Oct. 9-12, abstractUnited States, New Mexico, Colorado PlateauCarbonatite, Katungites, minettes
DS2001-1295
2001
Zdanowicz, C.Zdanowicz, C., Fisher, D., Clark, I., Lacelle, D.Ice marginal studies on Barnes Ice Cap, Baffin Island: clues to the history of the Laurentide ice sheet.29th. Yellowknife Geoscience Forum, Nov. 21-23, abstract p. 97.Northwest Territories, Baffin IslandGeomorphology
DS201708-1795
2017
Zdislav, S.Zdislav, S.Petrogenetic evidence and FTIR dat a constraints on the origin of diamonds in xenoliths from Yubileynaya and Komsomolskaya pipes, Yakutia.11th. International Kimberlite Conference, PosterRussiadeposit - Jubileynaya, Komsomolskaya
DS201708-1796
2017
Zdislav, S.Zdislav, S.Oxygen isotopes of garnets in Diamondiferous eclogites from the Udachnaya pipe, Yakutia: evidence for their origin.11th. International Kimberlite Conference, PosterRussiadeposit - Udachnaya
DS201806-1212
2018
Zdrokov, E.V.Bataleva, Yu.V., Palyanov, Yu.N., Borzdov, Yu.N., Zdrokov, E.V., Novoselov, I.D., Sobolev, N.V.Formation of the Fe, Mg-silicates, FeO, and graphite ( diamond) assemblage as a result of cohenite oxidation under lithospheric mantle conditions.Doklady Earth Sciences, Vol. 479, 1, pp. 335-338.Mantlegraphite

Abstract: Experimental studies in the Fe3C-SiO2-MgO system (P = 6.3 GPa, T = 1100-1500°C, t = 20-40 h) have been carried out. It has been established that carbide-oxide interaction resulted in the formation of Fe-orthopyroxene, graphite, wustite, and cohenite (1100 and 1200°C), as well as a Fe-C-O melt (1300-1500°C). The main processes occurring in the system at 1100 and 1200°C are the oxidation of cohenite, the extraction of carbon from carbide, and the crystallization of metastable graphite, as well as the formation of ferrosilicates. At T = 1300°C, graphite crystallization and diamond growth occur as a result of the redox interaction of a predominantly metallic melt (Fe-C-O) with oxides and silicates. The carbide-oxide interaction studied can be considered as the basis for modeling a number of carbon-producing processes in the lithospheric mantle at fO2 values near the iron-wustite buffer.
DS201412-0492
2014
Ze, L.Kusky, T.M., Li, X., Wang, Z., Fu, J., Ze, L., Zhu, P.Are Wilson cycles preserved in Archean cratons? A comparison of the North Chin and Slave cratons.Canadian Journal of Earth Sciences, Vol. 51, 3, pp. 297-311.China, Canada, Northwest TerritoriesWilson cycle
DS1910-0230
1911
Zealley, A.E.V.Zealley, A.E.V.The Somabula GravelsGeological Survey Southern Rhodesia., Report, P. 51.ZimbabweAlluvial Diamond Placers
DS1910-0548
1917
Zealley, A.E.V.Zealley, A.E.V.Notes on the Kimberlite Pipes of RhodesiaGeological Survey Southern Rhodesia., UNPUBL.ZimbabwePetrology, Kimberlite Mines And Deposits
DS1992-0448
1992
Zebker, H.A.Evans, D.L., Farr, T.G., Zebker, H.A., et al.Radar interferometry studies of the earth's topographyEos, Vol. 73, No. 52, December 29, pp. 553, 557, 558GlobalRadar imaging, Interferometry
DS1997-1293
1997
Zebrowski, E.Zebrowski, E.Perils of a restless planetCambridge University of Press, 320p. $ 25.00GlobalBook - ad, Natural disasters
DS1983-0402
1983
Zecchini, P.Leung, C.S., Merigoux, H., Poirot, J.P., Zecchini, P.Identification of precious stones and synthesis by infraredspectroscopy.(in French)Revue de Gemmologie, (in French), Vol. 75, pp. 14-15GlobalSpectroscopy
DS1989-0950
1989
Zecchini, P.Martin, F., Merigoux, H., Zecchini, P.Reflectance infrared spectroscopy in gemologyGems and Gemology, Vol. 25, No. 4, Winter pp. 226-231GlobalSpectroscopy, Mineral species -general
DS1997-1294
1997
Zeck, H.P.Zeck, H.P.Mantle peridotite outlining the Gibralter Arc - centrifugal extensionalallochthons derived from AlpineTectonophysics, Vol. 281, No. 3-4, Nov. 30, pp. 195-208.EuropeSubduction, Nappe pile
DS200812-1122
2008
Zedgenisov, D.A.A.A.Stepanov, A.A.S.A., Shatsky, V.A.S.A., Zedgenisov, D.A.A.A., Ragozin, A.A.L.A.Chemical heterogeneity in the Diamondiferous eclogite xenolith from the Udachanya pipe.Doklady Earth Sciences, Vol. 419, 2, pp. 308-311.RussiaPetrology - Udachnaya
DS1998-1329
1998
ZedgenizovShatsky, V.S., Zedgenizov, Yefimova, Rylov, De CorteA comparison of morphology and physical properties of microdiamonds From the mantle and crustal environments7th International Kimberlite Conference Abstract, pp. 797-9.Russia, YakutiaDiamond morphology - microdiamonds, Deposit - Udachanya, Sytykanskaya
DS1999-0656
1999
ZedgenizovShatsky, V.S., Zedgenizov, Yefimova, Rylov, De CorteA comparison of morphology and physical properties of microdiamonds from the mantle and crustal environments.7th International Kimberlite Conference Nixon, Vol. 2, pp. 757-63.Russia, Kokchatav Massif, Australia, WesternMicro diamonds, metamorphic rocks, Deposit - Udachnaya, Sytykanskaya
DS201112-0640
2011
ZedgenizovMalkovets, V.G., Zedgenizov, Sobolev, Kuzmin, Gibsher, Shchukina, Golovin, Verichev, PokhilenkoContents of trace elements in olivines from diamonds and peridotite xenoliths of the V.Grib kimberlite pipe ( Arkhangel'sk Diamondiferous province, Russia).Doklady Earth Sciences, Vol. 436, 2, pp. 301-307.RussiaDeposit - Grib
DS200612-0501
2006
Zedgenizov, D.Griffin, W.L., Rege, S., O'Reilly, S.Y., Jackson, S.E., Pearson, N.J., Zedgenizov, D., Kurat, G.Trace element patterns of diamond: toward a unified genetic model.Geochimica et Cosmochimica Acta, Vol. 70, 18, p. 218. abstract only.TechnologyDiamond genesis geochemistry
DS200812-1048
2008
Zedgenizov, D.Shatsky, V., Ragozin, A., Zedgenizov, D., Mityukhin, S.Evidence for multistage evolution in a xenolith of diamond bearing eclogite from the Udachnaya kimberlite pipe.Lithos, Vol. 105, 3-4, pp. 289-300.Russia, YakutiaDeposit - Udachnaya - distribution of diamonds
DS200912-0349
2008
Zedgenizov, D.Kagi, H., Odake, S., Zedgenizov, D.Depth of diamonds formation: a novel spectroscopic approach to the 3-D mapping of stress patterns.American Geological Union, Fall meeting Dec. 15-19, Eos Trans. Vol. 89, no. 53, meeting supplement, 1p. abstractMantleUHP
DS201012-0617
2010
Zedgenizov, D.Rege, S., Griffin, W.L., Pearson, A.J., Araujo, D., Zedgenizov, D., O'Reilly, S.Y.Trace element patterns of fibrous and monocrystalline diamonds: insights into mantle fluids.Lithos, Vol. 118, pp. 313-337.TechnologyDiamond genesis, morphology
DS201412-0436
2014
Zedgenizov, D.Kagi, H., Ishibashi, H., Zedgenizov, D., Shatsky, V., Ragozin, A.Growth condition of super-deep diamonds inferred from carbon isotopic compositions and chemical compositions of nano-inclusions.Goldschmidt Conference 2014, 1p. AbstractMantleMineral chemistry
DS201412-0469
2014
Zedgenizov, D.Kolesnichenko, M., Zedgenizov, D., Ragozin, A., Litasov, K.Water content in olivines of mantle xenoliths from Udachnaya kimberlite pipe, Yakutia.V.S. Sobolev Institute of Geology and Mineralogy Siberian Branch Russian Academy of Sciences International Symposium Advances in high pressure research: breaking scales and horizons ( Courtesy of N. Poikilenko), Held Sept. 22-26, 2p. AbstractRussia, YakutiaDeposit - Udachnaya
DS201412-1022
2014
Zedgenizov, D.Zedgenizov, D., Kagi, H., Shatsky, V.The deep carbon cycle: new evidence from superdeep diamonds.V.S. Sobolev Institute of Geology and Mineralogy Siberian Branch Russian Academy of Sciences International Symposium Advances in high pressure research: breaking scales and horizons ( Courtesy of N. Poikilenko), Held Sept. 22-26, 2p. AbstractSouth America, BrazilDeposit - Sao-Luis alluvials
DS201603-0435
2016
Zedgenizov, D.Zedgenizov, D., Rubatto, D., Shatsky, V., Ragozin, A., Kalinina, V.Eclogitic diamonds from variable crustal protoliths in the northeastern Siberian Craton: trace elements and coupled Delta13C-delta 180 signatures in diamonds and garnet inclusions.Chemical Geology, Vol. 422, pp. 46-59.RussiaGeochronology
DS201612-2338
2016
Zedgenizov, D.Skuzovatov, S., Zedgenizov, D., Howell, D., Griffin, W.L.Various growth environments of cloudy diamonds from Malobotuobia kimberlite field ( Siberian craton).Lithos, Vol. 265, pp. 96-107.Russia, SiberiaDeposit - Malobotuobia

Abstract: Microinclusions of high-density fluids (HDF's) occur in cloudy diamonds from the Mir and Internatsionalnaya kimberlite pipes (Malobotuobia kimberlite field, Siberian platform). These HDFs are of typical high-Mg carbonatitic composition; a few diamonds contain microinclusions that define a low-Mg carbonatitic to silicic trend. The observed variations are interpreted as resulted from mixing of two contrasting fluids derived from the partial melting mainly of carbonated peridotite (the high-Mg carbonatitic HDFs) and eclogite (silica-rich HDFs and HDFs with high Ca/(Ca + Mg + Fe)). Immiscibility of carbonatitic and silica-rich fluids provides a possible mechanism for the co-existence of the observed HDFs but needs further proof. The uniform carbon isotope composition of cloudy diamonds with high-Mg carbonatitic microinclusions from both kimberlite pipes implies a single peridotitic source.
DS201808-1781
2017
Zedgenizov, D.Ragozin, A., Zedgenizov, D., Kuper, K., Palyanov, Y.Specific internal structure of diamonds from Zarnitsa kimberlite pipe.Crystals, Vol. 7, 5, pp. 133-Russiadeposit - Zarnitsa

Abstract: The Zarnitsa kimberlite pipe is one of the largest pipes of the Yakutian diamondiferous province. Currently, some limited published data exists on the diamonds from this deposit. Among the diamond population of this pipe there is a specific series of dark gray to black diamonds with transition morphologies between octahedron and rounded rhombic dodecahedron. These diamonds have specific zonal and sectorial mosaic-block internal structures. The inner parts of these crystals have polycrystalline structure with significant misorientations between sub-individuals. The high consistency of the mechanical admixtures (inclusions) in the diamonds cores can cause a high grid stress of the crystal structure and promote the block (polycrystalline) structure of the core components. These diamond crystals have subsequently been formed due to crystallization of bigger sub-individuals on the polycrystalline cores according to the geometric selection law.
DS201901-0059
2017
Zedgenizov, D.Ragozin, A., Zedgenizov, D., Kuper, K., Kalimina, V., Zemnukhov, A.The internal structure of yellow cuboid diamonds from alluvial placers of the northeastern Siberian platform.Crystals MDPI, Vol. 7, 8, 13p. Doi.org/10. 3390/cryst7080238Russiadiamond morphology

Abstract: Yellow cuboid diamonds are commonly found in diamondiferous alluvial placers of the Northeastern Siberian platform. The internal structure of these diamonds have been studied by optical microscopy, X-Ray topography (XRT) and electron backscatter diffraction (EBSD) techniques. Most of these crystals have typical resorption features and do not preserve primary growth morphology. The resorption leads to an evolution from an originally cubic shape to a rounded tetrahexahedroid. Specific fibrous or columnar internal structure of yellow cuboid diamonds has been revealed. Most of them are strongly deformed. Misorientations of the crystal lattice, found in the samples, may be caused by strains from their fibrous growth or/and post-growth plastic deformation.
DS201904-0802
2017
Zedgenizov, D.Zedgenizov, D., Reutsky, V., Wiedenbeck, M.The carbon and nitrogen isotope characteristics of Type Ib-IaA cuboid diamonds from alluvial placers in the northeastern Siberian platform. MDPI Minerals, 14p. PdfRussiadiamond morphology

Abstract: Cuboid diamonds are particularly common in the placers of the northeastern Siberian platform, but their origin remains unclear. These crystals usually range in color from dark yellow to orange and, more interestingly, are characterized by unusual low aggregated nitrogen impurities (non-aggregated C-center), suggesting a short residence time and/or low temperatures at which they have been stored in the mantle. In order to track possible isotopic signature that could help deciphering cuboid diamond’s crystallization processes, d¹³C values, d¹5N values, and nitrogen concentrations have been determined in situ in three samples using secondary ion mass spectrometry (SIMS), whereas nitrogen aggregation states have been determined by FTIR spectroscopy. The samples fall out of the d¹³C vs. d¹5N field of canonical mantle composition. Different scales of carbon and nitrogen fractionation may produce the observed variations. Alternatively, mixing mantle and crustal material would obscure initial co-variations of d¹³C values with d¹5N or nitrogen content.
DS201908-1789
2019
Zedgenizov, D.Logvinova, A., Zedgenizov, D., Wirth, R.Specific multiphase assemblages of carbonatitic and Al rich silicic diamond forming fluid/melts: TEM observation of microinclusions in cuboid diamonds from the placers of northeastern Siberian craton.Minerals, Vol. 9, 11p.Russia, Siberiadeposit - Ebelyakh

Abstract: The microinclusions in cuboid diamonds from Ebelyakh River deposits (northeastern Siberian craton) have been investigated by FIB/TEM techniques. It was found that these microinclusions have multiphase associations, containing silicates, oxides, carbonates, halides, sulfides, graphite, and fluid phases. The bulk chemical composition of the microinclusions indicates two contrasting growth media: Mg-rich carbonatitic and Al-rich silicic. Each media has their own specific set of daughter phases. Carbonatitic microinclusions are characterized by the presence of dolomite, phlogopite, apatite, Mg, Fe-oxide, KCl, rutile, magnetite, Fe-sulfides, and hydrous fluid phases. Silicic microinclusions are composed mainly of free SiO2 phase (quartz), high-Si mica (phengite), Al-silicate (paragonite), F-apatite, Ca-carbonates enriched with Sr and Ba, Fe-sulfides, and hydrous fluid phases. These associations resulted from the cooling of diamond-forming carbonatitic and silicic fluids/melts preserved in microinclusions in cuboid diamonds during their ascent to the surface. The observed compositional variations indicate different origins and evolutions of these fluids/melts.
DS201908-1813
2019
Zedgenizov, D.Shatsky, V., Zedgenizov, D., Ragozin, A., Kalinina, V.Silicate melt inclusions in diamonds of eclogite paragenesis from placers on the northeastern Siberian craton.Minerals, Vol. 9, 7, pp. 412 ( 11p)Russia, Siberiadeposit - Kholomolokh

Abstract: New findings of silicate-melt inclusions in two alluvial diamonds (from the Kholomolokh placer, northeastern Siberian Platform) are reported. Both diamonds exhibit a high degree of N aggregation state (60-70% B) suggesting their long residence in the mantle. Raman spectral analysis revealed that the composite inclusions consist of clinopyroxene and silicate glass. Hopper crystals of clinopyroxene were observed using scanning electron microscopy and energy-dispersive spectroscopic analyses; these are different in composition from the omphacite inclusions that co-exist in the same diamonds. The glasses in these inclusions contain relatively high SiO2, Al2O3, Na2O and, K2O. These composite inclusions are primary melt that partially crystallised at the cooling stage. Hopper crystals of clinopyroxene imply rapid cooling rates, likely related to the uplift of crystals in the kimberlite melt. The reconstructed composition of such primary melts suggests that they were formed as the product of metasomatised mantle. One of the most likely source of melts/fluids metasomatising the mantle could be a subducted slab.
DS201910-2311
2019
Zedgenizov, D.Zedgenizov, D., Kagi, H., Ohtani, E., Tsujimori, T., Komatsu, K.Inclusions of (Mg,Fe)Si03 in superdeep diamonds - former bridgmanite?Goldschmidt2019, 1p. AbstractMantlediamond inclusions

Abstract: Bridgmanite (Mg,Fe)SiO3, a high pressure silicate with a perovskite structure, is dominant material in the Lower Mantle and therefore is probably the most abundant mineral in the Earth. One single-phase and two composite inclusions of (Mg,Fe)SiO3 coexisting with jeffbenite ((Mg,Fe)3Al2Si3O12), and with jeffbenite and olivine ((Mg,Fe)2SiO4) have been analyzed to identify retrograde phases of former bridgmanite in diamonds from Juina (Brazil). XRD and Raman spectroscopy have revealed that (Mg,Fe)SiO3 inclusions are orthopyroxene at ambient conditions. XRD patterns of these inclusions indicate that they consist of polycrystals. This polycrystalline textures together with high lattice strain of host diamond around these inclusions observed from EBSD may be an evidence for the retrograde phase transition of former bridgmanite. Single-phase inclusions of (Mg,Fe)SiO3 in superdeep diamonds are suggested to represent a retrograde phase of bridgmanite and fully inherit its initial chemical composition, including a high Al and low Ni contents [1,2]. The composite inclusions of (Mg,Fe)SiO3 with jeffbenite and other silicate and oxide phases may be interpreted as exsolution products from originally homogeneous bridgmanite [3]. The bulk compositions of these inclusions are rich in Al, Ti, and Fe which are similar to bridgmanite produced in experiments on the MORB composition. However, the retrograde origin of composite inclusions due to decomposition of Al-rich bridgmanite may be doubtful because each of observed phases may represent single-phase inclusions, i.e. bridgmanite and high pressure garnet (majoritic garnet), with similar compositional features.
DS201911-2556
2019
Zedgenizov, D.Ragozin, A., Zedgenizov, D., Kagi, H., Kuper, K.E., Shatsky, V.Deformation features of superdeep diamonds.Goldschmidt2019, 1p. AbstractSouth America, Brazil, Russia, Siberiadeposit - Juina

Abstract: Much of our knowledge of the Earth’s deep interior comes from theoretical models, which are based on the results of experimental petrology and seismology. Diamonds in such models are the unique natural samples because they contain and preserve inclusions of mantle materials that have been entrapped during diamond growth and remained unchanged for long geologic time. In the present study for superdeep sublithospheric diamonds from Saõ-Luiz (Juina, Brazil) and northeastern Siberian Platform with mineral inclusions of the Transition Zone and Lower Mantle (majorite garnet, coesite (stishovite), ferropericlase and Mg-Si-, Ca-Si-, Ca-Ti, Ca-Si- Ti-perovskite), the diffraction of backscattered electrons technique (EBSD) revealed features of the internal structure. Superdeep diamonds are characterized by a defective and imperfect internal structure, which is associated with the processes of growth and post-growth plastic deformation. The deformation is manifested both in the form of stripes parallel to the (111) direction, and in the form of an unordered disorientation of crystal blocks up to 2°. In addition, for many crystals, a block structure was established with a greater disorientation of the sub-individuals, as well as the presence of “diamond-in-diamond” inclusions and microtwins. Additional stresses are often observed around inclusions associated with the high remaining internal pressure. It has previously been shown that the crystal structure of superdeep diamonds is significantly deformed around inclusions of perovskites, SiO2 (stishovite?), and Mg2SiO4 (ringwoodite?). The significant plastic deformations detected by the EBSD around inclusions testify to phase transitions in superdeep minerals (perovskites, stishovite, and ringwoodite) [1].
DS202004-0549
2020
Zedgenizov, D.Zedgenizov, D., Bogush, I., Shatsky, V., Kovalchuk, O., Ragozin, A., Kalinina, V.Mixed habit type Ib-IaA diamond from an Udachnaya eclogite.Minerals MDPI, Vol. 9, 9120741, 12p. PdfRussiadeposit - Udachnaya

Abstract: The variety of morphology and properties of natural diamonds reflects variations in the conditions of their formation in different mantle environments. This study presents new data on the distribution of impurity centers in diamond type Ib-IaA from xenolith of bimineral eclogite from the Udachnaya kimberlite pipe. The high content of non-aggregated nitrogen C defects in the studied diamonds indicates their formation shortly before the stage of transportation to the surface by the kimberlite melt. The observed sectorial heterogeneity of the distribution of C- and A-defects indicates that aggregation of nitrogen in the octahedral sectors occurs faster than in the cuboid sectors.
DS202007-1187
2020
Zedgenizov, D.Zedgenizov, D., Kagi, H., Ohtani, E., Tsujimori, T., Komatsu, K.Retrograde phases of former bridgemanite inclusions in superdeep diamonds.Lithos, in press available, 25p. PdfSouth America, Brazil, Africa, South Africa, Guinea, Canada, Northwest Territoriesdeposit - Sao Luis, Juina

Abstract: Bridgmanite (Mg,Fe)SiO3, a high pressure silicate with a perovskite structure, is dominant material in the lower mantle at the depths from 660 to 2700 km and therefore is probably the most abundant mineral in the Earth. Although synthetic analogues of this mineral have been well studied, no naturally occurring samples had ever been found in a rock on the planet’s surface except in some shocked meteorites. Due to its unstable nature under ambient conditions, this phase undergoes retrograde transformation to a pyroxene-type structure. The identification of the retrograde phase as ‘bridgmanite’ in so-called superdeep diamonds was based on the association with ferropericlase (Mg,Fe)O and other high-pressure (supposedly lower-mantle) minerals predicted from theoretical models and HP-HT experiments. In this study pyroxene inclusions in diamond grains from Juina (Brazil), one single-phase (Sample SL-14) and two composite inclusions of (Mg,Fe)SiO3 coexisting with (Mg,Fe)3Al2Si3O12 (Sample SL-13), and with (Mg,Fe)3Al2Si3O12 and (Mg,Fe)2SiO4 (Sample SL-80) have been analyzed to identify retrograde phases of former bridgmanite. XRD and Raman spectroscopy have revealed that these are orthopyroxene (Opx). (Mg,Fe)2SiO4 and (Mg,Fe)3Al2Si3O12 in these inclusions are identified as olivine and jeffbenite (TAPP). These inclusions are associated with inclusions of (Mg,Fe)O (SL-14), CaSiO3 (SL-80) and composite inclusion of CaSiO3+CaTiO3 (SL-13). XRD patterns of (Mg,Fe)SiO3 inclusions indicate that they consist of polycrystals. This polycrystalline textures together with high lattice strain of host diamond around these inclusions observed from EBSD may be an evidence for the retrograde phase transition of former bridgmanite. Single-phase inclusions of (Mg,Fe)SiO3 in superdeep diamonds are suggested to represent a retrograde phase of bridgmanite and fully inherit its initial chemical composition, including a high Al and low Ni contents [Harte, Hudson, 2013; Kaminsky, 2017]. The composite inclusions of (Mg,Fe)SiO3 with jeffbenite and other silicate and oxide phases may be interpreted as exolusion products from originally homogeneous bridgmanite [Walter et al., 2011]. The bulk compositions of these composite inclusions are rich in Al, Ti, and Fe which are similar to Al-rich bridgmanite produced in experiments on the MORB composition. However, the retrograde origin of composite inclusions due to decomposition of Al-rich bridgmanite may be doubtful because each of observed phases may represent single-phase inclusions, i.e. bridgmanite and high pressure garnet (majoritic garnet), with similar compositional features.
DS202008-1460
2020
Zedgenizov, D.Zedgenizov, D., Kagi, H., Ohtaini, E., Tsujimori, T., Komatsu, K.Retrograde phases of former bridgemanite inclusions in superdeep diamonds.Lithos, Vol. 370-371, 105659 7p. PdfAfrica, South Africa, Guinea, Australia,South America, Brazil, Canada, Northwest Territoriesdeposit - Koffiefontein, Kankan, Lac de Gras, Juina, Machado, Orroroo

Abstract: (Mg,Fe)SiO3 bridgmanite is the dominant phase in the lower mantle; however no naturally occurring samples had ever been found in terrestrial samples as it undergoes retrograde transformation to a pyroxene-type structure. To identify retrograde phases of former bridgmanite single-phase and composite inclusions of (Mg,Fe)SiO3 in a series of superdeep diamonds have been examined with electron microscopy, electron microprobe, Raman spectroscopy and X-ray diffraction techniques. Our study revealed that (Mg,Fe)SiO3 inclusions are represented by orthopyroxene. Orthopyroxenes in single-phase and composite inclusions inherit initial chemical composition of bridgmanites, including a high Al and low Ni contents. In composite inclusions they coexist with jeffbenite (ex-TAPP) and olivine. The bulk compositions of these composite inclusions are rich in Al, Ti, and Fe, which are similar but not fully resembling Al-rich bridgmanite produced in experiments on the MORB composition. The retrograde origin of composite inclusions due to decomposition of Al-rich bridgmanite may be doubtful because each of observed minerals may represent coexisting HP phases, i.e. bridgmanite or ringwoodite.
DS1998-1624
1998
Zedgenizov, D.A.Zedgenizov, D.A., Logvinova, Shatskii, SobolevInclusions in microdiamonds from some kimberlite diatremes of YakutiaDoklady Academy of Sciences, Vol. 359, No. 2, pp. 204-8.Russia, YakutiaDiamond inclusions, Microdiamonds
DS1999-0825
1999
Zedgenizov, D.A.Zedgenizov, D.A., Fedorova, E.N., Shatsky, V.S.Microdiamonds from the Udachnaya kimberlite pipeRussian Geology and Geophysics, Vol. 39, No. 6, pp. 756-764.Russia, Siberia, YakutiaMicrodiamonds - mineral chemistry, Deposit - Udachnaya
DS2001-0698
2001
Zedgenizov, D.A.Logvinova, A.M., Zedgenizov, D.A., Sobolov, N.V.Pyroxenite paragenesis of abundant mineral and probable fluid inclusions in microdiamonds from Mir kimberliteDoklady Academy of Sciences, Vol. 380, No. 7, Sept-Oct. pp.795-800.Russia, SiberiaMineralogy - micro diamonds, Deposit - Mir
DS2001-1296
2001
Zedgenizov, D.A.Zedgenizov, D.A., Yefimova, E.S.Ferropericlase inclusions in a diamond microcrystal from the Udachnaya kimberlite pipe Yakutia.Doklady Academy of Sciences, Vol. 3771, March/April pp. 319-21.Russia, YakutiaMicrodiamonds, Deposit - Udachnaya
DS2002-1772
2002
Zedgenizov, D.A.Zedgenizov, D.A., Pokhilenko, N.P., Rylov, G.M., Milledge, J.H., Jones, A.P.Assorted diamond population from Snap lake mine ( Canada)18th. International Mineralogical Association Sept. 1-6, Edinburgh, abstract p.116Northwest TerritoriesDiamond - morphology
DS2003-1083
2003
Zedgenizov, D.A.Pkhilenko, N.P., Zedgenizov, D.A., Afanasiev, V.P., Rylov, G.M., Milledge, H.J.Morphology and internal structure of diamonds from Snap Lake, King Lake kimberlite8ikc, Www.venuewest.com/8ikc/program.htm, Session 3, POSTER abstractNorthwest TerritoriesDiamonds - morphology, Deposit - Snap Lake, King Lake
DS2003-1305
2003
Zedgenizov, D.A.Sobolev, N.V., Loginova, A.M., Yefimova, E.S., Zedgenizov, D.A., Channer, D.Polymineralic eclogite inclusions in Guaniamo diamonds, Venezuela: evidence for8ikc, Www.venuewest.com/8ikc/program.htm, Session 2, POSTER abstractVenezuelaEclogites and Diamonds, Deposit - Guaniamo
DS2003-1306
2003
Zedgenizov, D.A.Sobolev, N.V., Loginova, A.M., Zedgenizov, D.A., Yefimova, E.S., Taylor,L.A.Mineral inclusions in diamonds from the Komsomolskaya and Krasnopresnenskaya8ikc, Www.venuewest.com/8ikc/program.htm, Session 3, POSTER abstractRussia, SiberiaDiamonds - inclusions, Deposit - Komosomolskaya, Krasnopresnenskaya
DS2003-1307
2003
Zedgenizov, D.A.Sobolev, N.V., Logvinova, A.M., Zedgenizov, D.A., Yefimova, E.S.Mineral inclusions in microdiamonds and macrodiamonds from kimberlites of Yakutia: a8 Ikc Www.venuewest.com/8ikc/program.htm, Session 3, AbstractRussia, Yakutia, SiberiaDiamonds - inclusions
DS2003-1529
2003
Zedgenizov, D.A.Yeliseev, A.P., Pkhilenko, N.P., Zedgenizov, D.A., Steeds, J.Features of coated diamonds from the Snap Lake King Lake kimberlite dyke system8ikc, Www.venuewest.com/8ikc/program.htm, Session 3, POSTER abstractNorthwest TerritoriesDiamonds - inclusions, Deposit - Snap Lake, King Lake
DS2003-1541
2003
Zedgenizov, D.A.Zedgenizov, D.A., et al.Impurities and carbon isotope compositions of microdiamonds with extra faces from theRussian Geology and Geophysics, Vol. 44, No. 9, pp. 872-878RussiaUdachnaya pipe, carbon isotopes, microdiamonds
DS200412-1869
2004
Zedgenizov, D.A.Sobolev, N.V., Logvinova, A.M., Zedgenizov, D.A., Seryotkin, Y.V., Tefimova, E.S., Floss, C., Taylor, L.A.Mineral inclusions in microdiamonds and macrodiamonds from kimberlites of Yakutia: a comparative study.Lithos, Vol. 77, 1-4, Sept. pp. 225-242.Russia, Yakutia, SiberiaDiamond inclusions, craton, eclogite, peridotite
DS200412-1870
2003
Zedgenizov, D.A.Sobolev, N.V., Logvinova, A.M., Zedgenizov, D.A., Yefimova, E.S.Mineral inclusions in microdiamonds and macrodiamonds from kimberlites of Yakutia: a comparative study.8 IKC Program, Session 3, AbstractRussia, Yakutia, SiberiaDiamonds - inclusions
DS200412-2181
2004
Zedgenizov, D.A.Yelisseyev, A.P., Pokhilenko, N.P., Steeds, J.W., Zedgenizov, D.A., Afanasiev, V.P.Features of coated diamonds from the Snap Lake/King Lake kimberlite dyke, Slave Craton, Canada, as revealed by optical topographLithos, Vol. 77, 1-4, Sept. pp. 83-97.Canada, Northwest TerritoriesCoated diamonds, absorption, luminescence, nickel, nitr
DS200412-2198
2004
Zedgenizov, D.A.Zedgenizov, D.A., Harte, B.Microscale variations of d13C and N content within a natural diamond with mixed habit growth.Chemical Geology, Vol. 205, 1-2, pp. 169-175.TechnologyDiamond morphology
DS200412-2199
2004
Zedgenizov, D.A.Zedgenizov, D.A., Kagi, H., Shatsky, V.S., Sobolev, N.V.Carbonatitic melts in cuboid diamonds from the Udachnaya kimberlite pipe ( Yukatia): evidence from vibrational spectroscopy.Mineralogical Magazine, Vol. 6, 1, pp. 61-73.Russia, YakutiaDiamond morphology
DS200512-0968
2005
Zedgenizov, D.A.Shatsky, V.S., Zedgenizov, D.A., Ragozin, A.L., Mityukhin, S.I., Sobolev, N.V.Evidence for metasomatic formation of diamond in eclogite xenolith from the Udachnaya kimberlite pipe.Doklady Earth Sciences, Vol. 402, 4, pp. 587-90.Russia, YakutiaMetasomatism
DS200512-1233
2003
Zedgenizov, D.A.Zedgenizov, D.A., Reutsky, V.N., Shatsky, V.S., Fedorova, E.N.Impurities and carbon isotope compositions of microdiamonds with extra faces from the Udachnaya kimberlite pipe.Russian Geology and Geophysics, Vol. 44, 9, pp. 834-41.Russia, YakutiaDiamond inclusions - Udachnaya
DS200612-1274
2006
Zedgenizov, D.A.Shatsky, V.S., Stepanov, A.S., Zedgenizov, D.A., Ragozin, A.L.Mineral inclusions in diamonds from chemically heterogeneous eclogite xenolith.Geochimica et Cosmochimica Acta, Vol. 70, 18, p. 25. abstract only.RussiaDiamond inclusions
DS200612-1275
2006
Zedgenizov, D.A.Shatsky, V.S., Zedgenizov, D.A., Ragozin, A.L.Evidence of mantle modification in Diamondiferous eclogite xenolith from Udachnaya kimberlite pipe, Yakutia.Geochimica et Cosmochimica Acta, Vol. 70, 18, p. 25. abstract only.Russia, YakutiaDeposit - Udachnaya, metasomatism
DS200612-1330
2006
Zedgenizov, D.A.Sobolev, N.V., Logvinova, A.M., Zedgenizov, D.A., Kuzmin, D.V., Sobolev, A.V.Olivine inclusions in Siberian diamonds: high precision approach to trace elements.International Mineralogical Association 19th. General Meeting, held Kobe, Japan July 23-28 2006, Abstract p. 137.Russia, SiberiaGeochemistry - mineral inclusiosn
DS200612-1584
2006
Zedgenizov, D.A.Zedgenizov, D.A., Shiryaev, A.A., Shatsky, V.S., Kagi, H.Water related IR characteristics in natural fibrous diamonds.Mineralogical Magazine, Vol. 70, 2, April pp. 219-229.Russia, Africa, Democratic Republic of Congo, Canada, Northwest TerritoriesSpectroscopy, microinclusions
DS200712-0585
2007
Zedgenizov, D.A.Kuper, K.E., Zedgenizov, D.A., Ragozin, A.L., Shatsky, V.S., Porosev, V.V., Zolotarev, K.V., Baibchev, IvanovThree dimensional distribution of minerals in Diamondiferous eclogites, obtained by the method of high resolution X-ray computed tomography.Nuclear Instruments and Methods in Physics Research Section A., Vol. 575, 1-2, pp. 255-258.TechnologyDiamond genesis
DS200712-0891
2007
Zedgenizov, D.A.Reutsky, V.N., Zedgenizov, D.A.Some specific features of genesis of microdiamonds of octahedral and cubic habit from kimberlites of the Udachanaya pipe inferred from carbon isotopes - defectRussian Geology and Geophysics, Vol. 48, pp. 299-304.Russia, YakutiaMicrodiamonds
DS200712-1042
2007
Zedgenizov, D.A.Stepanov, A.S., Shatsky, V.S., Zedgenizov, D.A., Sobolev, N.V.Causes of variations in morphology and impurities of diamonds from the Udachnaya pipe eclogite.Russian Geology and Geophysics, Vol. 48, no. 9, pp. 758-769.Russia, YakutiaDiamond morphology
DS200712-1043
2007
Zedgenizov, D.A.Stepanov, A.S., Zedgenizov, D.A., Shatsky, V.S.FTIR water observation in minerals from diamond inclusions and matrix of Diamondiferous eclogite.Plates, Plumes, and Paradigms, 1p. abstract p. A973.RussiaUdachnaya
DS200712-1218
2007
Zedgenizov, D.A.Zedgenizov, D.A., Ragozin, A.L., Shatsky, V.S.Chloride carbonate fluid in diamonds from the eclogite xenolith.Doklady Earth Sciences, Vol. 445, 6, pp. DOI:10.1134/S1028334 X07060293Russia, YakutiaGeochemistry
DS200812-1092
2008
Zedgenizov, D.A.Sobolev, N.V., Logvinova, A.M., Zedgenizov, D.A., Pokhilenko, N.P., Kuzmin, D.V., Sobolev, A.V.Olivine inclusions in Siberian diamonds: high precision approach to minor elements.European Journal of Mineralogy, Vol. 20, no. 3, pp. 305-315.Russia, SiberiaDiamond inclusions
DS200912-0708
2009
Zedgenizov, D.A.Sobolev, N.V., Logvinova, A.M., Zedgenizov, D.A., Pokhilenko, N.P., Malygina, E.V., Kuzmin, D.V., Sobolev, A.V.Petrogenetic significance of minor elements in olivines from diamonds and peridotite xenoliths from kimberlites of Yakutia.Lithos, In press - available 38p.Russia, YakutiaDiamond inclusions
DS200912-0849
2009
Zedgenizov, D.A.Zedgenizov, D.A., Ragozin, A.L., Shjatsky, V.S., Araujo, D., Griffin, W.L., Kagi, H.Mg and Fe rich carbonate silicate high density fluids in cuboid diamonds from the Internationalnaya kimberlite pipe. Yakutia.Lithos, In press availableRussia, YakutiaDeposit - International
DS201012-0332
2009
Zedgenizov, D.A.Kagi, H., Odake, S., Fukura, S., Zedgenizov, D.A.Raman spectroscopic estimation of depth of diamond origin: technical developments and the application.Russian Geology and Geophysics, Vol. 50, 12, pp. 1183-1187.TechnologyDiamond genesis
DS201012-0406
2010
Zedgenizov, D.A.Korsakov, A.V., Perraki, M., Zedgenizov, D.A., Bindi, L.Diamond graphite relationships in ultrahigh pressure metamorphic rocks from the Kochetav Massif, northern Kazakhstan.Journal of Petrology, Vol. 51, 3, pp. 763-783.RussiaUHP
DS201012-0607
2009
Zedgenizov, D.A.Ragozin, A.L., Shatskii, V.S., Zedgenizov, D.A.New dat a on the growth environment of diamonds of the variety V from placers of the northeastern Siberian platform.Doklady Earth Sciences, Vol. 425, 2, April pp. 436-440.Russia, SiberiaAlluvials
DS201012-0691
2010
Zedgenizov, D.A.Shatskii, V.S., Zedgenizov, D.A., Ragozin, A.L.Majoritic garnets in diamonds from placers of the northeastern Siberian Platform.Doklady Earth Sciences, Vol. 432, 2, pp. 839-845.RussiaAlluvials
DS201112-0944
2011
Zedgenizov, D.A.Shatski, V.S., Zedgenizov, D.A., Ragozin, A.L., Kalinina, V.V., Reutskii, V.N.Local variations in carbon isotopes and nitrogen contents in diamonds from placers of the northeastern portion of the Siberian Platform.Doklady Earth Sciences, Vol. 440, 1, pp.Russia, SiberiaGeochronology
DS201112-0973
2011
Zedgenizov, D.A.Skuzovatov, S.Yu., Zedgenizov, D.A., Shatsky, V.S., Ragozin, A.L., Kuper, K.E.Composition of cloudy Micro inclusions in octahedral diamonds from the Internatsional'naya kimberlite pipe ( Yakutia).Russian Geology and Geophysics, Vol. 52, pp. 85-96.Russia, YakutiaDiamond morphology, inclusions
DS201112-1156
2011
Zedgenizov, D.A.Zedgenizov, D.A., Ragozin, Shatsky, Kagi, Odake, Griffin, Araujo, YuryevaEvidence for evolution of growth media in superdeep diamonds from Sao-Luis Brazil.Goldschmidt Conference 2011, abstract p.2244.South America, BrazilCl imaging
DS201212-0507
2012
Zedgenizov, D.A.Nadolinny, V.A., Yuryeva,O.P., Rakhmanova, M.I., Shatsky, V.S., Palyanov, Y.N., Kupriyanov, I.N., Zedgenizov, D.A., Ragozin, A.L.Distribution of OK1, N3 and NU1 defects in diamond crystals of different habits.European Journal of Mineralogy, Vol. 24, 4, pp. 645-650.TechnologyDiamond morphology
DS201312-0729
2013
Zedgenizov, D.A.Ragozin, A.L., Shatsky, V.S., Zedgenizov, D.A., Griffin, W.L.Growth medium and carbon source of unusual rounded diamonds from alluvial placers of the north-east of Siberian platform.Goldschmidt 2013, AbstractRussia, SiberiaPlacers, alluvials
DS201312-0805
2013
Zedgenizov, D.A.Shatsky, V.S., Zedgenizov, D.A., Ragozin, A.L.Evidence for formation of alluvial diamonds from north-east of Siberian platform in subduction environment.Goldschmidt 2013, 1p. AbstractRussiaAlluvials
DS201312-0831
2012
Zedgenizov, D.A.Skuzovatov, S.Yu., Zedgenizov, D.A., Ragozin, A.L., Shatsky, V.S.Growth medium composition of coated diamonds from the Sytykanskaya kimberlite pipe ( Yakutia).Russian Geology and Geophysics, Vol. 53, 11, pp. 1197-1208.RussiaDeposit - Sytykanskaya
DS201312-1006
2014
Zedgenizov, D.A.Zedgenizov, D.A., Kagi, H., Shatsky, V.S., Ragozin, A.Local variations of carbon isotope composition in diamonds from Sao-Luis ( Brazil): evidence for heterogenous carbon reservoir in sublithospheric mantle.Chemical Geology, Vol. 363, pp. 114-124.South America, BrazilDeposit - Sao Luis area
DS201312-1007
2013
Zedgenizov, D.A.Zedgenizov, D.A., Ragozin, A.L., Shatsky, V.S., Griffin, W.L.Parental growth media of Siberian diamonds - relation to kimberlites.Goldschmidt 2013, 1p. AbstractRussiaDiamond morphology
DS201412-0718
2014
Zedgenizov, D.A.Ragozin, A.L., Zedgenizov, D.A., Shatskii, V.S., Orihashi, Y., Agashev, A.M., Kagi, H.U Pb age of rutile from the eclogite xenolith of the Udachnaya kimberlite pipe.Doklady Earth Sciences, Vol. 457, 1, pp. 861-864.Russia, YakutiaDeposit - Udachnaya
DS201412-0801
2014
Zedgenizov, D.A.Shatsky, V.S., Zedgenizov, D.A., Ragozin, A.L., Kalinina, V.V.Carbon isotopes and nitrogen contents in placer diamonds from the NE Siberian craton: implications for diamond origins.European Journal of Mineralogy, Vol. 26, 1, pp. 41-52.RussiaAlluvials
DS201412-0802
2015
Zedgenizov, D.A.Shatsky, V.S., Zedgenizov, D.A., Ragozin, A.L., Kalinina, V.V.Diamondiferous subcontinental lithospheric mantle of the northeastern Siberian craton: evidence from mineral inclusions in alluvial diamonds.Gondwana Research, Vol. 28, 1, pp. 106-120.Russia, SiberiaMineral inclusions
DS201412-1023
2014
Zedgenizov, D.A.Zedgenizov, D.A., Shatskiy, A., Ragozin, A.L., Kagi, H., Shatsky, V.S.Merwinite in diamond from Sao Luiz, Brazil: a new mineral of the Ca-rich mantle environment.American Mineralogist, Vol. 99, pp. 547-550.South America, BrazilMineralogy
DS201502-0102
2015
Zedgenizov, D.A.Skuzovatov, S.Yu., Zedgenizov, D.A., Rakevich, A.L., Shatsky, V.S., Martynovich, E.F.Multiple growth events in diamonds with cloudy Micro inclusions from the Mir kimberlite pipe: evidence from the systematics of optically active defects.Russian Geology and Geophysics, Vol. 56, 1, pp. 330-343.RussiaDeposit - Mir
DS201502-0128
2015
Zedgenizov, D.A.Zedgenizov, D.A., Shatsky, V.S., Panin, A.V., Evtushenko, O.V., Ragozin, A.L., Kagi, H.Evidence for phase transitions in mineral inclusions in superdeep diamonds of the Sao Luiz deposit, Brazil.Russian Geology and Geophysics, Vol. 56, 1, pp. 296-305.South America, BrazilDeposit - Sao Luiz
DS201506-0301
2015
Zedgenizov, D.A.Zedgenizov, D.A., Pokhilenko, N.P., Griffin, W.L.Carbonate- silicate composition of diamond forming media of fibrous diamonds from Snap Lake area, Canada.Doklady Earth Sciences, Vol. 461, 1, pp. 297-300.Canada, Northwest TerritoriesMicro-inclusions
DS201507-0309
2015
Zedgenizov, D.A.Dobretsov, N.L., Zedgenizov, D.A., Litasov, K.D.Evidence for and consequences of the "hot" subduction model.Doklady Earth Sciences, Vol. 461, 1, pp. 517-521.MantleSubduction
DS201507-0328
2015
Zedgenizov, D.A.Mironov, V.P., Rakevich, A.L., Stepanov, F.A., Emelyanova, A.S., Zedgenizov, D.A., Shatsky, V.S., Kagi, H., Martynovich, E.F.Luminescence in diamonds of the Sao Luiz placer ( Brazil).Russian Geology and Geophysics, Vol. 56, pp. 729-736.South America, BrazilDiamond luminesence
DS201507-0335
2015
Zedgenizov, D.A.Shatsky, V.S., Zedgenizov, D.A., Ragozin, A.L., Kalinina, V.V.Diamondiferous subcontinental lithospheric mantle of the northeastern Siberian Craton: evidence from mineral inclusions in alluvial diamonds. Kapchan Fold Belt Olenek ProvinceGondwana Research, Vol. 28, 1, pp. 106-120.RussiaDiamond - inclusions
DS201509-0440
2015
Zedgenizov, D.A.Yuryeva, O.P., Rakhmanova, M.I., Nadolinny, V.A., Zedgenizov, D.A., Shatsky, V.S., Kagi, H., Komarovskikh, A.Yu.The characteristic photoluminescence and EPR features of superdeep diamonds ( Sao Luis, Brazil).Physics and Chemistry of Minerals, In press available 16p.South America, Brazil, Mato GrossoDeposit - Juina area

Abstract: Photoluminescence (PL) spectroscopy and electron paramagnetic resonance (EPR) were used for the first time to characterize properties of superdeep diamonds from the São-Luis alluvial deposits (Brazil). The infrared measurements showed the low nitrogen content (>50 of 87 diamonds from this locality were nitrogen free and belonged to type IIa) and simultaneously the extremely high level of nitrogen aggregation (pure type IaB being predominant), which indicates that diamonds under study might have formed under high pressure and temperature conditions. In most cases, PL features excited at various wavelengths (313, 473, and 532 nm) were indicative of different growth and post-growth processes during which PL centers could be formed via interaction between vacancies and nitrogen atoms. The overall presence of the 490.7 nm, H3, and H4 centers in the luminescence spectra attests to strong plastic deformations in these diamonds. The neutral vacancy known as the GR1 center has probably occurred in a number of crystals due to radiation damage in the post-growth period. The 558.5 nm PL center is found to be one of the most common defects in type IIa samples which is accompanied by the EPR center with g-factor of 2.00285. The 536 and 576 nm vibronic systems totally dominated the PL spectra of superdeep diamonds, while none of "normal" diamonds from the Mir pipe (Yakutia) with similar nitrogen characteristics showed the latter three PL centers.
DS201511-1892
2015
Zedgenizov, D.A.Yuryeva, O.P., Rakhmanova, M.I., Nadolinny, V.A., Zedgenizov, D.A., Shatsky, V.S., Kagi, H., Komarovskikh, A.Yu.The characteristic photoluminescence and EPR features of superdeep diamonds ( Sao-Luis, Brazil).Physics and chemistry of Minerals, Vol. 42, 9, pp. 707-722.South America, BrazilSao-Luis alluvials

Abstract: Photoluminescence (PL) spectroscopy and electron paramagnetic resonance (EPR) were used for the first time to characterize properties of superdeep diamonds from the São-Luis alluvial deposits (Brazil). The infrared measurements showed the low nitrogen content (>50 of 87 diamonds from this locality were nitrogen free and belonged to type IIa) and simultaneously the extremely high level of nitrogen aggregation (pure type IaB being predominant), which indicates that diamonds under study might have formed under high pressure and temperature conditions. In most cases, PL features excited at various wavelengths (313, 473, and 532 nm) were indicative of different growth and post-growth processes during which PL centers could be formed via interaction between vacancies and nitrogen atoms. The overall presence of the 490.7 nm, H3, and H4 centers in the luminescence spectra attests to strong plastic deformations in these diamonds. The neutral vacancy known as the GR1 center has probably occurred in a number of crystals due to radiation damage in the post-growth period. The 558.5 nm PL center is found to be one of the most common defects in type IIa samples which is accompanied by the EPR center with g-factor of 2.00285. The 536 and 576 nm vibronic systems totally dominated the PL spectra of superdeep diamonds, while none of "normal" diamonds from the Mir pipe (Yakutia) with similar nitrogen characteristics showed the latter three PL centers.
DS201603-0423
2016
Zedgenizov, D.A.Stepanov, F.A., Mironov, V.P., Rakevich, A.L., Shatsky, V.S., Zedgenizov, D.A., Martynovich, E.F.Red luminescence decay kinetics in Brazilian diamonds. ( Juina)Bulletin of the Russian Academy of Sciences. Physics ** IN ENG, Vol. 80, 1, pp. 74-77.South America, BrazilDiamond formation

Abstract: Luminescence kinetics in the temperature range of 80 480 K and the red region of the spectrum is studied for Brazilian diamonds. Components with decay time constants of 23 and 83 ns are observed at room temperature after being excited by laser radiation with wavelengths of 375 and 532 nm, which differs considerably from the data published earlier for the luminescence kinetics of NV 0- and NV -centers.
DS201603-0434
2015
Zedgenizov, D.A.Yureva, O.P., Rakhmanova, M.I., Nadolinny, V.A., Zedgenizov, D.A., Shatsjy, V.S., Kagi, H., Komarovskikh, A.Y.The characteristic photoluminesence and EPR features of super deep diamonds ( Sao-Luis, Brazil).Physics and Chemistry of Minerals, Vol. 42, 9, pp. 707-722.South America, BrazilDeposit - Sao-Luis

Abstract: Photoluminescence (PL) spectroscopy and electron paramagnetic resonance (EPR) were used for the first time to characterize properties of superdeep diamonds from the São-Luis alluvial deposits (Brazil). The infrared measurements showed the low nitrogen content (>50 of 87 diamonds from this locality were nitrogen free and belonged to type IIa) and simultaneously the extremely high level of nitrogen aggregation (pure type IaB being predominant), which indicates that diamonds under study might have formed under high pressure and temperature conditions. In most cases, PL features excited at various wavelengths (313, 473, and 532 nm) were indicative of different growth and post-growth processes during which PL centers could be formed via interaction between vacancies and nitrogen atoms. The overall presence of the 490.7 nm, H3, and H4 centers in the luminescence spectra attests to strong plastic deformations in these diamonds. The neutral vacancy known as the GR1 center has probably occurred in a number of crystals due to radiation damage in the post-growth period. The 558.5 nm PL center is found to be one of the most common defects in type IIa samples which is accompanied by the EPR center with g-factor of 2.00285. The 536 and 576 nm vibronic systems totally dominated the PL spectra of superdeep diamonds, while none of “normal” diamonds from the Mir pipe (Yakutia) with similar nitrogen characteristics showed the latter three PL centers.
DS201610-1902
2016
Zedgenizov, D.A.Ragozin, A.L., Zedgenizov, D.A., Kuper, K.E., Shatsky, V.S.Radial mosaic internal structure of rounded diamond crystals from alluvial placers of Siberian platform. EbayakMineralogy and Petrology, in press available 15p.RussiaX-ray topography

Abstract: The specific gray to almost black diamonds of rounded morphology are especially typical in alluvial placers of the northeastern part of the Siberian platform. The results of study of internal structure of these diamonds are presented. X-ray topography and birefringence patterns of polished plates of studied diamonds show their radial mosaic structure. Diamonds consists of slightly misorientated (up to 20') subindividuals which are combined to mosaic wedge-shaped sectors. Electron back-scatter diffraction technique has demonstrated that subindividuals are often combined in the single large blocks (subgrains). The whole crystals commonly consist of several large subgrains misoriented up to 5° to one another. The total nitrogen content of these diamonds vary in the range 900-3300 ppm and nitrogen aggregation state (NB/(NB + NA)*100) from 25 to 64 %. Rounded diamond crystals of variety V are suggested to have been formed at the high growth rate caused by the high oversaturation of carbon in the crystallization medium. It may result in the splitting of growing crystal and their radial mosaic structure as a sequence. High content of structural nitrogen defects and the great number of mechanical impurities - various mineral and fluid inclusions may also favor to generation of this structure.
DS201610-1909
2016
Zedgenizov, D.A.Sobolev, N.V., Shatsky, V.S., Zedgenizov, D.A., Ragozin, A.L., Reutsky, V.N.Polycrystalline diamond aggregates from the Mir kimberlite pipe, Yakutia: evidence for mantle metasomatism.Lithos, in press available 10p.RussiaDeposit - Mir

Abstract: Polycrystalline diamond aggregates (boart, framesites, diamondites) have been widely studied but their origin is poorly understood. We report the results of a study in situ of two polished fragments of fine-grained (40-400 µm size of individual diamond grains) dense polycrystalline diamond aggregates from the Mir pipe containing visible multiple interstitial garnet inclusions. They were analyzed for major and trace elements of inclusions and one of them — for d13C and N abundance and isotopic composition of host diamonds. These aggregates are classified as variety IX by Orlov (1977). No cavities were observed in these samples. Sixty two irregular garnet grains and one clinopyroxene inclusion were detected and analyzed in sample Mr 832. Garnets are homogeneous within single grains but variable in Mg# [100Mg/(Mg + Fe)] from 60 up to 87 and CaO contents (3.3-5.3 wt.%) among grains with a trend to negative correlation. Low Cr (550-640 ppm) confirms eclogitic (E-type) paragenesis. High Na2O contents (5.2 wt.%) of a single pyroxene inclusion are additional evidence of eclogitic nature of this sample. Wide variations in trace elements (ppm) are characteristic for garnet grains: Sr (2.7-25.6), Y (9.7-14.1), Zr (15.6-38.7) and positive Eu anomaly is present. The d13C of diamonds within studied sample is variable (- 6.4 ÷- 9.8 ‰) as well as N abundance (75-1150 ppm) and d15N - 27, - 38, - 58 ‰. The second peridotitic (U/P-type) sample Mr 838 contains eight inclusions of Mg-rich Cr-pyropes (Mg# ~ 85, Cr2O3 3.2-3.4 wt.%) and magnesite inclusion with 4.35 wt.% FeO and 1.73 wt.% CaO. Trace element content in pyropes is relatively uniform (ppm): Sr (0.4-1.6), Y (13.2-13.4) and Zr (13.0). We conclude that heterogeneous distribution of the trace elements among garnet grains in Mr 832 and magnesite presence in Mr 838 are indicative of the effects of mantle metasomatism and rapid crystallization shortly before the eruption of the kimberlite.
DS201611-2117
2016
Zedgenizov, D.A.Kagi, H., Zedgenizov, D.A., Ohfuji, H., Ishibashi, H.Micro- and nano-inclusions in a superdeep diamond from Sao Luiz, Brazil.Geochemistry International, Vol. 54, 10, pp. 834-838.South America, BrazilDeposit - Sao Luiz

Abstract: We report cloudy micro- and nano-inclusions in a superdeep diamond from São-Luiz, Brazil which contains inclusions of ferropericlase (Mg, Fe)O and former bridgmanite (Mg, Fe)SiO3 and ringwoodite (Mg, Fe)2SiO4. Field emission-SEM and TEM observations showed that the cloudy inclusions were composed of euhedral micro-inclusions with grain sizes ranging from tens nanometers to submicrometers. Infrared absorption spectra of the cloudy inclusions showed that water, carbonate, and silicates were not major components of these micro- and nano-inclusions and suggested that the main constituent of the inclusions was infrared-inactive. Some inclusions were suggested to contain material with lower atomic numbers than that of carbon. Mineral phase of nano- and micro-inclusions is unclear at present. Microbeam X-ray fluorescence analysis clarified that the micro-inclusions contained transition metals (Cr, Mn, Fe, Co, Ni, Cu, Zn) possibly as metallic or sulfide phases. The cloudy inclusions provide an important information on the growth environment of superdeep diamonds in the transition zone or the lower mantle.
DS201612-2327
2016
Zedgenizov, D.A.Ragozin, A.L., Palyanov, Yu.N., Zedgenizov, D.A., Kalinin, A.A., Shatsky, V.S.Homogenization of carbonate bearing Micro inclusions in diamond at P-T parameters of the upper mantle.Doklady Earth Sciences, Vol. 470, 2, pp. 1059-1062.RussiaDeposit - Internationalskaya

Abstract: The staged high-pressure annealing of natural cubic diamonds with numerous melt microinclusions from the Internatsional’naya kimberlite pipe was studied experimentally. The results mainly show that the carbonate phases, the daughter phases in partially crystallized microinclusions in diamonds, may undergo phase transformations under the mantle P-T conditions. Most likely, partial melting and further dissolution of dolomite in the carbonate-silicate melt (homogenization of inclusions) occur in inclusions. The experimental data on the staged high-pressure annealing of diamonds with melt microinclusions allow us to estimate the temperature of their homogenization as 1400-1500°C. Thus, cubic diamonds from the Internatsional’naya pipe could have been formed under quite high temperatures corresponding to the lithosphere/asthenosphere boundary. However, it should be noted that the effect of selective capture of inclusions with partial loss of volatiles in relation to the composition of the crystallization medium is not excluded during the growth. This may increase the temperature of their homogenization significantly between 1400 and 1500°C.
DS201612-2351
2016
Zedgenizov, D.A.Zedgenizov, D.A., Kalinina, V.V., Reutsky, V.N., Yuryeva, O.P., Rakhmanova, M.I.Regular cuboid diamonds from placers on the northeastern Siberian platform.Lithos, Vol. 265, pp. 125-137.Russia, SiberiaDiamond morphology

Abstract: Alluvial placers of the northeastern Siberian Platform are characterized by a specific diamond population: regular cuboids, forming a continuous color series from yellowish-green to yellow and dark orange. This is the first comprehensive study of a large number of cuboid diamonds focusing on their morphology, N content and aggregation state, photoluminescence, C isotopic composition and inclusions. The cuboids are cubic (i.e. nearly flat faced) to subrounded crystals; most of them are resorbed. The cathodolominescence images and the birefringence patterns show that many cuboid diamonds record deformation. The cuboid diamonds are characterized by unusual FTIR spectra with the presence of C- (single nitrogen atom) and A- (pair of neighbour nitrogen atoms) centers, and two centers of unknown origin, termed X and Y. The presence of single substitutional nitrogen defects (C centers) in all cuboid diamonds testifies either storage in the mantle at relatively cool conditions or formation just prior to eruption of their host kimberlites. The studied diamonds are also characterized by the presence of specific set of luminescence centers: N3, H3, S1, NVo and NV-, some of which are suggested to have formed during deformation subsequent to diamond growth. The cuboid diamonds show a wide range of carbon isotope compositions from mantle-like values towards strongly 13C depleted compositions (- 6.1 to - 20.2‰ d13C). Combined with the finding of an eclogitic sulfide inclusion, the light carbon isotope compositions link the formation of the studied cuboids to deeply subducted basic protoliths, i.e. former oceanic crust.
DS201702-0222
2017
Zedgenizov, D.A.Kolesnichenko, M.V., Zedgenizov, D.A., Litasov, K.D., Safonova, I.Y., Ragozin, A.L.Heterogenesous distribution of water in the mantle beneath the central Siberian Craton: implications for Udachnaya kimberlite pipe.Gondwana Research, in press available 18p.RussiaDeposit - Udachnaya

Abstract: The paper presents new petrographic, major element and Fourier transform infrared (FTIR) spectroscopy data and PT-estimates of whole-rock samples and minerals of a collection of 19 relatively fresh peridotite xenoliths from the Udachnaya kimberlite pipe, which were recovered from its deeper levels. The xenoliths are non-deformed (granular), medium-deformed and highly deformed (porphyroclastic, mosaic-porphyroclastic, mylonitic) lherzolites, harzburgite and dunite. The lherzolites yielded equilibration temperatures (T) and pressures (P) ranging from 913 to 1324 °C and from 4.6 to 6.3 GPa, respectively. The non-deformed and medium-deformed peridotites match the 35 mW/m2 conductive continental geotherm, whereas the highly deformed varieties match the 45 mW/m2 geotherm. The content of water spans 2 ± 1-95 ± 52 ppm in olivine, 1 ± 0.5-61 ± 9 ppm in orthopyroxene, and 7 ± 2-71 ± 30 ppm in clinopyroxene. The amount of water in garnets is negligible. Based on the modal proportions of mineral phases in the xenoliths, the water contents in peridotites were estimated to vary over a wide range from < 1 to 64 ppm. The amount of water in the mantle xenoliths is well correlated with the deformation degree: highly deformed peridotites show highest water contents (64 ppm) and those medium-deformed and non-deformed contain ca. 1 ppm of H2O. The high water contents in the deformed peridotites could be linked to metasomatism of relatively dry diamondiferous cratonic roots by hydrous and carbonatitic agents (fluids/melts), which may cause hydration and carbonation of peridotite and oxidation and dissolution of diamonds. The heterogeneous distribution of water in the cratonic mantle beneath the Udachnaya pipe is consistent with the models of mantle plume or veined mantle structures proposed based on a trace element study of similar xenolithic suits. Mantle metasomatism beneath the Siberian Craton and its triggered kimberlite magmatism could be induced by mantle enrichment in volatiles (H2O, CO2) supplied by numerous subduction zones which surrounded the Siberian continent in Neoproterozoic-Cambrian time.
DS201706-1086
2017
Zedgenizov, D.A.Kolesnichenko, M.V., Zedgenizov, D.A., Litasov, K.D., Safonova, I.Y., Ragozin, A.L.Heterogeneous distribution of water in the mantle beneath the central Siberian craton: implications from the Udachachnaya kimberlite pipe.Gondwana Research, Vol. 47, pp. 249-266.Russiadeposit - Udachnaya

Abstract: The paper presents new petrographic, major element and Fourier transform infrared (FTIR) spectroscopy data and PT-estimates of whole-rock samples and minerals of a collection of 19 relatively fresh peridotite xenoliths from the Udachnaya kimberlite pipe, which were recovered from its deeper levels. The xenoliths are non-deformed (granular), medium-deformed and highly deformed (porphyroclastic, mosaic-porphyroclastic, mylonitic) lherzolites, harzburgite and dunite. The lherzolites yielded equilibration temperatures (T) and pressures (P) ranging from 913 to 1324 °C and from 4.6 to 6.3 GPa, respectively. The non-deformed and medium-deformed peridotites match the 35 mW/m2 conductive continental geotherm, whereas the highly deformed varieties match the 45 mW/m2 geotherm. The content of water spans 2 ± 1-95 ± 52 ppm in olivine, 1 ± 0.5-61 ± 9 ppm in orthopyroxene, and 7 ± 2-71 ± 30 ppm in clinopyroxene. The amount of water in garnets is negligible. Based on the modal proportions of mineral phases in the xenoliths, the water contents in peridotites were estimated to vary over a wide range from < 1 to 64 ppm. The amount of water in the mantle xenoliths is well correlated with the deformation degree: highly deformed peridotites show highest water contents (64 ppm) and those medium-deformed and non-deformed contain ca. 1 ppm of H2O. The high water contents in the deformed peridotites could be linked to metasomatism of relatively dry diamondiferous cratonic roots by hydrous and carbonatitic agents (fluids/melts), which may cause hydration and carbonation of peridotite and oxidation and dissolution of diamonds. The heterogeneous distribution of water in the cratonic mantle beneath the Udachnaya pipe is consistent with the models of mantle plume or veined mantle structures proposed based on a trace element study of similar xenolithic suits. Mantle metasomatism beneath the Siberian Craton and its triggered kimberlite magmatism could be induced by mantle enrichment in volatiles (H2O, CO2) supplied by numerous subduction zones which surrounded the Siberian continent in Neoproterozoic-Cambrian time.
DS201706-1111
2017
Zedgenizov, D.A.Yuryeva, O.P., Rakhmanova, M.I., Zedgenizov, D.A.Nature of type 1aB diamonds from the Mir kimberlite pipe (Yakutia): evidence from spectroscopic observation.Physics and Chemistry of Minerals, in press available 13p.Russia, Yakutiadeposit - Mir
DS201707-1366
2017
Zedgenizov, D.A.Shuzovatov, S.Y., Zedgenizov, D.A., Rakevich, A.L.Spectroscopic constraints on growth of Siberian mixed habit diamonds.Contributions to Mineralogy and Petrology, Vol. 172, pp. 46-64.Russiadeposit -Mir, Internationalnaya, Udachnaya, Nyurbinskaya

Abstract: Notable within-crystal variability of mineralogical and geochemical properties of single natural diamonds are commonly attributed to changing chemistry of parental fluids, sources of carbon and redox conditions of diamond precipitation. A distinct type of compositional heterogeneity (mixed-habit structure) is well-known to occur in diamonds as well as in many other minerals due to purely “structural” reasons that are unequal crystal chemistry of crystallographically different faces and selective absorption and fractionation of impurities between adjacent growth pyramids. Based on the combined cathodoluminescence, Fourier-transformed infrared spectroscopy and photoluminescence spectroscopy, study of nine diamond crystals with different growth histories and external morphology, but all showing mixed-habit patterns at different growth stages, we show that mixed-diamonds may grow in closed system conditions or with a slowly decreasing growth rate from a media with a much lower impurity content than previously thought. Intracrystal nitrogen distribution seems to be a function of growth rate even in the cases of unusual impurity partitioning between growth sectors. Generally poor with IR-active hydrogen at moderate nitrogen aggregation parameters, studied diamonds likely resemble the low hydrogen content from the growth medium that, for cubic diamonds, was typically suggested hydrogen-rich and a crucial factor for growth of cubic and mixed-habit diamonds. We also show that mixed-habit diamond growth may occur not only in peridotitic suite but also in an extended field of geochemical affinities from high-Ni to low-Ni or maybe even Ni-free environments, such as pyroxenitic or eclogitic.
DS201711-2536
2017
Zedgenizov, D.A.Yuryeva, O.P., Rakhmanova, M.I., Zedgenizov, D.A.Nature of type IaB diamonds from the Mir kimberlite pipe ( Yakutia): evidence from spectroscopic observation.Physics and Chemistry of Minerals, Vol. 44, 9, pp. 655-667.Russia, Yakutiadeposit - Mir

Abstract: In this study, the specific features of structural defects of type IaB diamonds from the Mir kimberlite pipe (Yakutian diamondiferous province) have been characterized using FTIR and photoluminescence spectroscopy. Mineral inclusions in these diamonds [olivine (Ol), orthopyroxene (OPx), chromite (Chr), sulphide (Sf)] correspond to associations of peridotite rocks at the base of the lithosphere. Nitrogen content in type IaB diamonds shows significant variations, suggesting different growth media and/or several growth stages. A specific feature of these diamonds is the absence or very small amount of platelets, which may be related to annealing during their long-term residence at the temperatures of the base of the lithosphere. All studied diamonds show the presence of hydrogen defects that are active in IR spectra with an intense line at 3107 cm-1, and additional weaker lines at 3085 and 3237 cm-1, which correlated with high nitrogen content. Type IaB diamonds are also characterized by the presence of nitrogen-nickel luminescence centres S2, S3 and 523.2 nm. This feature distinguishes them from superdeep diamonds with extreme nitrogen aggregation states, which clearly attest to different growth conditions and crystallization media of type IaB diamonds from the Mir kimberlite pipe.
DS201802-0257
2017
Zedgenizov, D.A.Pavlushin, A.D., Zedgenizov, D.A., Pirogovskaya, K.L.Crystal morphological evolution of growth and dissolution of curve faced cubic diamonds from placers of the Anabar Diamondiferous region.Geochemistry International, Vol. 55, 12, pp. 1193-1203.Russiadiamond - crystallography

Abstract: In this paper, we consider an ontogenic model for the formation of morphological types of growth and dissolution of cubic diamonds of variety II by Yu.L. Orlov from placers of the Anabar diamondiferous region. The following ontogenic domains of crystals and corresponding evolutionary stages of growth accompanying a general decrease in supersaturation in the crystallization medium were distinguished: microblock mosaic cuboids with defects produced by the mechanism of rotational plastic deformation-cuboids with linear translation deformations-cuboids and antiskeletal growth forms of cuboids composed of octahedral growth layers-pseudocubic growth forms of a flat-faced octahedron. The crystal morphological evolution of cuboids during the bulk dissolution of individuals in fluid-bearing melt transporting them to the surface was traced. The investigation of transitional forms of cuboid diamond dissolution showed that the final form of diamond dissolution is a rounded tetrahexahedroid independent of the combination of cuboid faces with subordinate faces of octahedron, rhombododecahedron, and tetrahexahedron observed on resorbed crystals of cubic habit. It was found that the final stages of cuboid dissolution produced disk-shaped microrelief features on the diamond surface in the form of randomly distributed ideal rounded etch pits resulting from interaction with microscopic cavitation gas bubbles released during the decompression of ascending kimberlite melt.
DS201805-0953
2018
Zedgenizov, D.A.Ivanov, A.V., Mukasa, S.B., Kamenetsky, V.S., Ackerman, M., Demonterova, E.I., Pokrovsky, B.G., Vladykin, N.V., Kolesnichenko, M.V., Litasov, K.D., Zedgenizov, D.A.Origin of high-Mg melts by volatile fluxing without significant excess of temperature.Chemical Geology, https://doi.org/ 10.1016/j .chemgeo. 2018.03.11Russiameimechites
DS201806-1241
2018
Zedgenizov, D.A.Ragozin, A.L., Zedgenizov, D.A., Shatsky, V.S., Kuper, K.E.Formation of mosaic diamonds from the Zarnitsa kimberlite.Russian Geology and Geophysics, Vol. 59, pp. 486-498.Russiadeposit - Zarnitsa

Abstract: Mosaic diamonds from the Zarnitsa kimberlite (Daldyn field, Yakutian diamondiferous province) are morphologicaly and structurally similar to dark gray mosaic diamonds of varieties V and VII found frequently in placers of the northeastern Siberian craton. However, although being similar in microstructure, the two groups of diamonds differ in formation mechanism: splitting of crystals in the case of placer diamonds (V and VII) and growth by geometric selection in the Zarnitsa kimberlite diamonds. Selective growth on originally polycrystalline substrates in the latter has produced radial micro structures with grains coarsening rimward from distinctly polycrystalline cores. Besides the formation mechanisms, diamonds of the two groups differ in origin of mineral inclusions, distribution of defects and nitrogen impurity, and carbon isotope composition. Unlike the placer diamonds of varieties V and VII, the analyzed crystals from the Zarnitsa kimberlite enclose peridotitic minerals (olivines and subcalcic Cr-bearing pyropes) and have total nitrogen contents common to natural kimberlitic diamonds (0 to 1761 ppm) and typical mantle carbon isotope compositions (-1.9 to -6.2%c 513C; -4.2%c on average). The distribution of defect centers in the Zarnitsa diamond samples fits the annealing model implying that nitrogen aggregation decreases from core to rim.
DS201809-2041
2018
Zedgenizov, D.A.Iskrina, A.V., Bobrov, A.V., Kriulina, G.Y., Zedgenizov, D.A., Garanin, V.K.Melt/fluid inclusions in diamonds from the Lomonosov deposit ( Arkangelsk kimberlite province).Goldschmidt Conference, 1p. AbstractRussia, Kola Peninsuladeposit - Lomonosov

Abstract: Melt/fluid inclusions in diamonds provide important evidence for mantle diamond-forming fluids or melts. By now, the major characteristics of the composition of microinclusions have been analyzed in diamonds from several kimberlite provinces and pipes worldwide [1-4]. Here we report the first data on the composition of parent diamondforming melts for diamonds from the Arkhangelsk kimberlite province. After the study of morphology, specialty of the internal structure, and distribution of microinclusions in diamonds, 10 single crystals were selected from the 31 diamonds of the representative collection. The studied crystals may be divided into two groups: cuboids and coated diamonds. The crystals have grayish yellow or dark gray colors and are almost nontransparent due to the high content of microinclusions. Polished slices of these diamonds were studied by IR-spectroscopy, which allowed us to calculate the content of nitrogen defects, as well as the content of water and carbonates in microinclusions. X-ray spectral analyses allowed to study the composition of fluid/melt microinclusions and showed that they were essentially carbonate-silicate with significant variations between these two end-members. All inclusions contain water, with the highest H2O/CO2 in highly siliceous inclusions. Unlike diamonds from Canada and South Africa [1, 2], the studied inclusions in diamionds from the Arkhangelsk province are almost free of chlorides. Comparison of the data obtained with the database on fliud/melt inclusions in diamonds worldwide shows similar of Arkhangelsk diamonds to some diamonds from Yakutia [3, 4], and the data obtained are the most similar to the composition of microinclusions in diamonds from the Internatsionalnaya pipe (Yakutia).
DS201810-2339
2018
Zedgenizov, D.A.Kolesnichenko, M.V., Zedgenizov, D.A., Ragozin, A.L., Litasov, K.D., Shatsky, V.S.The role of eclogites in the redistribution of water in the subcontinental mantle of the Siberian craton: results of determination of the water content in minerals from the Udachnaya pipe eclogites.Russian Geology and Geophysics, Vol. 59, 7, pp. 763-779.Russia, Siberiadeposit - Udachnaya

Abstract: A comprehensive study of 26 mafic mantle xenoliths from the Udachnaya kimberlite pipe was carried out. The contents of major and trace elements, equilibrium temperature parameters, and water content in the rock-forming minerals were determined. The temperatures of formation of the studied rocks are estimated at 800-1300 °C. According to IR spectroscopy data, the water content in clinopyroxenes from the studied eclogites varies from values below the detection limit to 99 ppm. The IR spectra of garnets lack bands of water. The water content in clinopyroxene and orthopyroxene from garnet websterite is 72 and 8 ppm, respectively. The water content in the average rock, calculated from the ratio of the rock-forming minerals, varies from a few to 55 ppm. No relationship among the water content, equilibrium temperatures, and rock composition is established. The low water contents in the eclogites are close to the earlier determined water contents in peridotites from the same pipe and are, most likely, due to the re-equilibration of the eclogites with the rocks of the peridotitic lithospheric mantle. The dehydration of the protolith during its subduction and the partial melting of eclogites before their removal by kimberlitic magma to the surface might be an additional cause of the low water contents in the mantle eclogite xenoliths.
DS201811-2622
2018
Zedgenizov, D.A.Zedgenizov, D.A., Ragozin, A.L., Shatsky, V.S., Griffin, W.L.Diamond formation during metasomatism of mantle eclogite by chloride-carbonate melt.Contributions to Mineralogy and Petrology, Vol. 173, 16p. Doi.org/10.1007/s00410-018-1513-yRussiadeposit - Udachnaya

Abstract: A xenolith of bimineralic eclogite from the Udachnaya kimberlite pipe provides a snapshot of interaction between mantle rocks and diamond-forming fluids/melts. The major-element composition of the eclogite is similar to that of N-MORB and/or oceanic gabbros, but its trace-element pattern shows the effects of mantle metasomatism, which resulted in diamond formation. The diamonds are clustered in alteration veins that crosscut primary garnet and clinopyroxene. The diamonds contain microinclusions of a fluid/melt dominated by carbonate and KCl. Compared to the worldwide dataset, the microinclusions in these diamonds fall in middle of the range between saline fluids and low-Mg carbonatitic melts. The fluid/melt acted as a metasomatic agent that percolated through ancient eclogitic rocks stored in the mantle. This interaction is consistent with calculated partition coefficients between the rock-forming minerals and diamond-forming fluid/melt, which are similar to experimentally-determined values. Some differences between the calculated and experimental values may be due to the low contents of water and silicates in the chloride-carbonate melt observed in this study, and in particular its high contents of K and LILE. The lack of nitrogen aggregation in the diamonds implies that the diamond-forming metasomatism took place shortly before the eruption of the kimberlite, and that the microinclusions thus represent saline carbonate-rich fluids circulating in the basement of lithospheric mantle (150-170 km depth).
DS201905-1045
2019
Zedgenizov, D.A.Ivanov, A.V., Mukasa, S.B., Kamenetsky, V.S., Ackerson, M., Zedgenizov, D.A.Volatile concentrations in olivine hosted melt inclusions from meimechite and melanephenelinite lavas of the Siberian Trap Large Igneous Province: evidence for flux related high Ti, high Mg magmatism.Chemical Geology, Vol. 483, pp. 442-462.Russiameimechite
DS201905-1076
2019
Zedgenizov, D.A.Skuzovatov, S.Yu., Zedgenizov, D.A.Protracted fluid-metasomatism of the Siberian diamondiferous subcontinental lithospheric mantle as recorded in coated, cloudy and monocrystalline diamonds.Mineralogy and Petrology, 10.1007/s0710-019-00661-3 Russiadiamond morphology

Abstract: Five typical coated diamonds (from Udachnaya, Yubileynaya, and Aikhal kimberlite pipes) with untypically low microinclusion abundances and four monocrystalline diamonds (Udachnaya, Mir, Nyurbinskaya pipes) that exhibit thin intermediate microinclusion-bearing zones were examined in details for growth structures, characteristic infrared absorption and photoluminescence, and composition of microinclusions. The internal structures of diamonds of both types imply that fluid inclusions entrapment in diamonds does not necessarily relate to the terminal stage of rapid fibrous growth. Instead, nitrogen aggregation state in some diamonds showed that both fibrous coats and inclusion-bearing layers might experience an annealing during mantle residence long enough to pre-date the ultimate kimberlite eruption, whereas the diamonds with internal inclusion-bearing zones also experienced later protracted history of monocrystalline growth. The presence of chloride-carbonate-silicate fluids/melts in monocrystalline diamonds indicate their generation from media generally similar to that observed in some fibrous diamonds. However, the composition of these metasomatizing fluids is different for the mantle beneath Udachnaya (mostly carbonatitic) and other pipes (Aikhal, Yubileynaya, Mir; variable abundance of silicic high-density fluids). The abundance of silica-rich fluids record either a heterogeneous distribution of eclogites in the subcontinental lithospheric mantle, or the operation of silica-rich slab-derived fluids. The inclusion abundance as well as the type of growth (fibrous or monocrystalline) is considered to be controlled by the volume of fluid fluxes; in this case, fluid consumption leads to decreasing growth rates, diminishing inclusion entrainment and stability of layered octahedrons. The detected minor compositional variations of high-density fluids in these diamonds may be due to local scale thermal perturbation in the host source and/or limited chemical heterogeneity of the parental fluid. The high amount of chlorides in high-density fluids from monocrystalline diamonds provide a new evidence for compositions of fluids/melts acting as primary metasomatic agent in the deep mantle of Siberian craton.
DS201906-1349
2019
Zedgenizov, D.A.Skuzovatov, S.Y., Zedgenizov, D.A.Protracted fluid metasomatism of the Siberian diamondiferous subcontinental lithospheric mantle as recorded in coated, cloudy and monocrystalline diamonds.Mineralogy and Petrology, Vol. 113, pp. 285-306.Russia, Siberiadeposit - Udachnaya, Yubileynaya, Aikhal, Mir, Nyurbinskaya

Abstract: Five typical coated diamonds (from Udachnaya, Yubileynaya, and Aikhal kimberlite pipes) with untypically low microinclusion abundances and four monocrystalline diamonds (Udachnaya, Mir, Nyurbinskaya pipes) that exhibit thin intermediate microinclusion-bearing zones were examined in details for growth structures, characteristic infrared absorption and photoluminescence, and composition of microinclusions. The internal structures of diamonds of both types imply that fluid inclusions entrapment in diamonds does not necessarily relate to the terminal stage of rapid fibrous growth. Instead, nitrogen aggregation state in some diamonds showed that both fibrous coats and inclusion-bearing layers might experience an annealing during mantle residence long enough to pre-date the ultimate kimberlite eruption, whereas the diamonds with internal inclusion-bearing zones also experienced later protracted history of monocrystalline growth. The presence of chloride-carbonate-silicate fluids/melts in monocrystalline diamonds indicate their generation from media generally similar to that observed in some fibrous diamonds. However, the composition of these metasomatizing fluids is different for the mantle beneath Udachnaya (mostly carbonatitic) and other pipes (Aikhal, Yubileynaya, Mir; variable abundance of silicic high-density fluids). The abundance of silica-rich fluids record either a heterogeneous distribution of eclogites in the subcontinental lithospheric mantle, or the operation of silica-rich slab-derived fluids. The inclusion abundance as well as the type of growth (fibrous or monocrystalline) is considered to be controlled by the volume of fluid fluxes; in this case, fluid consumption leads to decreasing growth rates, diminishing inclusion entrainment and stability of layered octahedrons. The detected minor compositional variations of high-density fluids in these diamonds may be due to local scale thermal perturbation in the host source and/or limited chemical heterogeneity of the parental fluid. The high amount of chlorides in high-density fluids from monocrystalline diamonds provide a new evidence for compositions of fluids/melts acting as primary metasomatic agent in the deep mantle of Siberian craton.
DS201910-2275
2019
Zedgenizov, D.A.Kriulina, G.Yu., Iskrina, A.V., Zedgenizov, D.A., Bobrov, A.V., Garanin, V.K.The compositional pecularities of microinclusions in diamonds from the Lomonosov deposit ( Arkangelsk Province).Geochemistry International, Vol. 57, 9, pp. 963-980.Russiadeposit - Lomonosov

Abstract: The data on the composition of microinclusions in diamonds from the Lomonosov deposits are reported for the first time. The studied diamonds include “coated” (n = 5) and cubic (n = 5) crystals. The estimated range of the degree of nitrogen aggregation in diamonds (4-39% B1) does not support their direct links with kimberlite magmatism; however, their short occurrence in the mantle at higher temperatures is probable as well. The composition of melt/fluid microinclusions in these samples varies from essentially carbonatitic to significantly silicate. It is shown that the contents of MgO, CaO, Na2O, Cl, and P2O5 decrease with increasing content of silicates and water. Different mechanisms of the generation and evolution of diamond-forming media are discussed to explain the observed variations.
DS201910-2312
2019
Zedgenizov, D.A.Zedgenizov, D.A., Ragozin, A.L., Kagi, H., Yurimoto, H., Shatsky, V. S.SiO2 inclusions in sublithospheric diamonds.Geochemistry International, Vol. 57, 9, pp. 964-972.Mantlediamond inclusions

Abstract: The paper describes mineralogical characteristics of SiO2 inclusions in sublithospheric diamonds, which typically have complicated growth histories showing alternating episodes of growth, dissolution, and postgrowth deformation and crushing processes. Nitrogen contents in all of the crystals do not exceed 71 ppm, and nitrogen is detected exclusively as B-defects. The carbon isotope composition of the diamonds varies from d13? = -26.5 to -6.7‰. The SiO2 inclusions occur in association with omphacitic clinopyroxenes, majoritic garnets, CaSiO3, jeffbenite, and ferropericlase. All SiO2 inclusions are coesite, which is often associated with micro-blocks of kyanite in the same inclusions. It was suggested that these phases have been produced by the retrograde dissolution of primary Al-stishovite, which is also evidenced by the significant internal stresses in the inclusions and by deformations around them. The oxygen isotope composition of SiO2 inclusions in sublithospheric diamonds (d18O up to 12.9‰) indicates a crustal origin of the protoliths. The negative correlation between the d18O of the SiO2 inclusions and the d13C of their host diamonds reflects interaction processes between slab-derived melts and reduced mantle rocks at depths greater than 270 km.
DS201911-2544
2019
Zedgenizov, D.A.Malkovets, V.G., Rezvukhin, D.I., Griffin, W.L., Tretiakova, I.G., Pearson, N.J., Gibsher, A.A., Belousova, E.A., Zedgenizov, D.A., O'Reilly, S.Y.Re-Os dating of sulfide inclusions in Cr-pyropes from the Upper Muna kimberlites.Goldschmidt2019, 1p. AbstractRussiadeposit - Upper Muna

Abstract: Archean cratons are underlain by highly depleted subcontinental lithospheric mantle (SCLM). However, there are extensive evidences that Archean SCLM has been extensively refertilized by metasomatic processes, with the addition of Fe, Ca, and Al to depleted protoliths. The distribution of sub-calcic Cr-rich garnets in the SCLM beneath the Siberian craton suggests (1) sub-calcic garnets and diamonds are metasomatic phases in the cratonic SCLM; (2) the distribution of both phases is laterally heterogeneous on relatively small scales and related to ancient structural controls [1]. Re-Os isotopic compositions of twenty six sulfide inclusions in lherzolitic Cr-pyropes from Upper Muna kimberlites have been determined by laser ablation MCICPMS. Most analysed sulfides (~92%) have very low Re/Os ratios (<0.07), and their Re-depletion ages (TRD) form three major peaks: 3.4-2.8, 2.2-1.8 and 1.4-1.2 Ga (±0.03 Ga, mean 2s analytical uncertainty). One sulfide give the oldest TRD age at 4 Ga. Our data suggest that refertilization of the highly depleted SCLM and the introduction of Cr-pyrope garnet occurred in several episodes. The oldest age of ca 4 Ga indicate on the beginning of the formation of the depleted SCLM of the Siberian Craton in Hadean time [2].
DS202005-0774
2020
Zedgenizov, D.A.Yuryeva, O.P., Rakhmanova, M.I., Zedgenizov, D.A., Kalinina, V.V.Spectroscopic evidence of the origin of brown and pink diamonds family from Internatsionalnaya kimberlite pipe ( Siberian craton).Physics and Chemistry of Minerals, Vol. 47, 20 doi.org/10/1007/ s00269-020-01088-5 19p. PdfRussiadeposit - International

Abstract: New spectroscopic data were obtained to distinguish the specific features of brown and pink diamonds from Internatsionalnaya kimberlite pipe (Siberian craton). It is shown that pink and brown samples differ markedly in the content and degree of aggregation of nitrogen defects. Pink diamonds generally have higher nitrogen content and a lower aggregation state compared to brown samples, which often show significant variations in nitrogen content and aggregation state between different growth zones. The 491 and 576 nm luminescent centres, which are signs of deformed brown diamonds, are absent or of low intensity in pink diamonds implying that high nitrogen content predominantly in A form in the pink diamonds had stiffened the diamonds against natural plastic deformation. The GR1 centre, formed by a neutrally charged vacancy, was observed only in pink diamonds, which may be due to their formation and storage in the mantle at lower-temperature conditions. Mineral inclusions indicate peridotitic and eclogitic paragenesis for studied brown and pink diamonds, respectively. It is suggested that brown diamonds have been formed in a primitive mantle at higher temperatures and/or stored there much longer.
DS202011-2070
2020
Zedgenizov, D.A.Zemnukhov, A.L., Reutsky, V.N., Zedgenizov, D.A., Ragozin, A.L., Zhelonkin, R.Y., Kalinina, V.V.Subduction related population of diamonds in Yakutian placers, northeastern Siberian platform.Contributions to Mineralogy and Petrology, Vol. 175, 98 10.1007/s00410-020-01741-w 11p. PdfRussia, Yakutiadiamond crystallography

Abstract: The 35 paired diamond intergrowths of rounded colorless transparent and gray opaque crystals from the placers of northeastern Siberian Platform were investigated. Mineral inclusions (KFsp, Coe, E-Grt, Po) detected in studied samples belong to eclogitic paragenesis. The majority of studied samples have uniform ranges of nitrogen content (1126-1982 at. ppm) and carbon isotope composition (-?16.8 to -?23.2 ‰). These characteristics pointing towards subducted material are possible sources for their genesis. Two samples consist of a gray opaque crystal with the subduction-related characteristics (d13C ca. -?21‰ and N ca. 1300 at. ppm) and a transparent crystal with low nitrogen content (412 and 29 at. ppm) and a heavy carbon isotopic composition (d13C -?4.2 and -?4.6‰) common for primary mantle range. The higher degree of nitrogen aggregation in the crystals with mantle-like characteristics testifies their longer storage in the mantle conditions. These samples reflect multistage diamond growth history and directly indicate the mixing of mantle and subduction carbon sources at the basement of subcontinental lithospheric mantle of northeastern Siberian Platform.
DS202012-2256
2020
Zedgenizov, D.A.Zedgenizov, D.A., Skuzovatov, S.Y., Griffin, W.L., Pomazansky, B.S., Ragozin, A.:., Kalinina, V.V.Diamond forming HDFs tracking episodic mantle metasomatism beneath Nyurbinskaya kimberlite pipe (Siberian craton).Contributions to Mineralogy and Petrology, Vol. 175, 106, 21p. PdfRussiadeposit - Nyurbinskaya

Abstract: We present a new dataset on the composition of high-density fluids (HDFs) in cloudy (n?=?25), coated (n?=?10) and cuboid (n?=?10) diamonds from the Nyurbinskaya kimberlite pipe. These diamonds represent different populations each showing distinct growth histories. The cores of coated diamonds display multiple growth stages and contrasting sources of carbon. Fibrous coats and cuboid diamonds have similar carbon isotopes and nitrogen systematics, suggesting their formation in the last metasomatic events related to kimberlite magmatism, as is common for most such diamonds worldwide. The HDFs in most of these diamonds span a wide range from low-Mg carbonatitic to hydrous silicic compositions. The major- and trace-element variations suggest that the sources for such HDFs range in composition between the depleted mantle and more fertile mantle reservoirs. Hydrous-silicic HDFs could originate from a 13C-enriched source, which originates through subduction of crustal metasedimentary material. Percolation of such HDFs through carbonated eclogites and peridotites facilitates the formation of cuboid diamonds and fibrous coats in the mantle section beneath the corresponding area of the Siberian craton. Cloudy diamonds represent an apparently older population, reflecting continuous diamond formation predominantly from high-Mg carbonatitic HDFs that caused discrete episodes of diamond precipitation. Their high Mg# and enrichment in incompatible elements support a metasomatized peridotitic source for these HDFs.
DS202101-0019
2020
Zedgenizov, D.A.Kalugina, A.D., Zedgenizov, D.A.Micro-Raman spectroscopy assessment of chemical compounds of mantle clinopyroxenes. ( diamond)Minerals MDPI, Vol. 10, 1084, doi:10.3390/ min10121084 10p. PdfMantlespectroscopy

Abstract: The composition of clinopyroxenes is indicative for chemical and physical properties of mantle substrates. In this study, we present the results of Raman spectroscopy examination of clinopyroxene inclusions in natural diamonds (n = 51) and clinopyroxenes from mantle xenoliths of peridotites and eclogites from kimberlites (n = 28). The chemical composition of studied clinopyroxenes shows wide variations indicating their origin in different mantle lithologies. All clinopyroxenes have intense Raman modes corresponding to metal-oxygen translation (~300-500 cm-1), stretching vibrations of bridging O-Si-Obr (?11~670 cm-1), and nonbridging atoms O-Si-Onbr (?16~1000 cm-1). The peak position of the stretching vibration mode (?11) for the studied clinopyroxenes varies in a wide range (23 cm-1) and generally correlates with their chemical composition and reflects the diopside-jadeite heterovalent isomorphism. These correlations may be used for rough estimation of these compounds using the non-destructive Raman spectroscopy technique.
DS200812-1123
2008
Zedgenizov, D.A.A.A.Stepanov, A.A.S.A., Shatsky, V.A.S.A., Zedgenizov, D.A.A.A., Ragozin, A.A.L.A.Chemical heterogenity in the Diamondiferous eclogite xenolith from the Udachnaya kimberlite pipe.Doklady Earth Sciences, Vol. 419, 1, pp. 308-311.RussiaGeochemistry - Udachnaya
DS201012-0701
2010
Zedhenizov, D.A.Shiryaev, A.A., Johner, N., Zedhenizov, D.A.Infra red mapping of defects in diamonds using a focal plane array ( FPA) detector.International Mineralogical Association meeting August Budapest, abstract p. 693.TechnologyDiamond inclusion - nitrogen
DS1988-0714
1988
Zee, R.Tzeng, Y., Kung, P.J., Zee, R., Legg, K., Solnick-Legg, H., BurnsSpiral hollow cathode plasma assisted diamond depositionAppl. Phys. Letters, Vol. 53, No. 23, pp. 2326-2327GlobalDiamond coatings, Diamond applications
DS1992-0198
1992
Zeegers, H.Butt, C.R.M., Zeegers, H.Regolith exploration geochemistry in tropical and subtropical terrainsElsevier, 600pAustralia, Africa, Algeria, Burkina Faso, Sudan, MaliGeochemistry -laterites, Book -table of contents
DS1994-0549
1994
Zeegers, H.Freyssinet, Ph., Zeegers, H.A quantitative approach to gold signal evolution in terms of lateriticcontextsFrench Geological Survey (BRGM) Principal Scient. Technology Research 1992-3, pp. 119-120GlobalGold, weathering, laterites, Deposit -Kangaba, Posse, Mborguene, Ity, Dondo Mobi
DS1994-1979
1994
Zeese, R.Zeese, R., Scwertmann, U., Tietz, G.F., Jux, U.Mineralogy and stratigraphy of three deep lateritic profiles of the Josplateau (Central Nigeria)Catena, Laterization and Supergene Ore, Vol. 21, No. 2-3, pp. 195-214NigeriaMIneralogy, Laterization
DS2001-1297
2001
Zegers, T.Zegers, T., Van Keken, P.E.Middle Archean continent formation by crustal delaminationGeology, Vol. 29, No. 12, Dec. pp. 1083-6.AustraliaPilbara Craton, eclogite
DS1999-0826
1999
Zegers, T.E.Zegers, T.E., De Wit, M.J., White, S.H.Vaalbara, Earth's oldest assembled continent? a combined structural, geochronological, paleomagnetic..Terra Nova, Vol. 10, No. 5, p. 250-259.Paleomagnetics, tectonics
DS2003-1342
2003
Zegers, T.E.Strik, G., Blake, T.S., Zegers, T.E., White, S.H., Langereis, C.G.Paleomagnetism of flood basalts in the Pilbara Craton, Western Australia: Late ArcheanJournal of Geophysical Research, Vol. 108, No. B 12, Dec. 3, 10.1029/2003JB002475AustraliaGeophysics - paleomagnetics, tectonics
DS200412-1937
2003
Zegers, T.E.Strik, G., Blake, T.S., Zegers, T.E., White, S.H., Langereis, C.G.Paleomagnetism of flood basalts in the Pilbara Craton, Western Australia: Late Archean continental drift and the oldest known reJournal of Geophysical Research, Vol. 108, No. B 12, Dec. 3, 10.1029/2003 JB002475AustraliaGeophysics - paleomagnetics, tectonics
DS200612-1585
2006
Zegrenizov, D.A.Zegrenizov, D.A., Harte, B., Shatsky, V.S., Politov, A.A., Rylov, G.M., Sobolev, N.V.Directional chemical variations in diamonds showing octahedral following cuboid growth.Contributions to Mineralogy and Petrology, Vol. 151, 1, Jan. pp. 45-57.Russia, YakutiaMineral chemistry, subduction
DS200712-1219
2007
Zeh, A.Zeh, A., Gerdes, A., Klemd, R., Barton, J.M.Jr.Archean to Proterzooic crustal evolution in the Central Zone of the Limpopo belt ( South Africa - Botswana ): constraints from combined U Pb and Lu Hf isotope analyses of zircon.Journal of Petrology, Vol. 48, 8, pp.1605-1639.Africa, South Africa, BotswanaGeochronology
DS200712-1220
2007
Zeh, A.Zeh, A., Gerdes, A., Klemd, R., Barton, J.M.Jr.Archean to Proterzooic crustal evolution in the Central Zone of the Limpopo belt ( South Africa - Botswana ): constraints from combined U Pb and Lu Hf isotope analyses of zircon.Journal of Petrology, Vol. 48, 8, pp.1605-1639.Africa, South Africa, BotswanaGeochronology
DS200812-0570
2008
Zeh, A.Kirchenbauer, M., Zeh, A., Klemd, R.Multiple crustal growth and recycling processes inferred from U-Pb and Lu-Hf zircons - evidence from the Limpopo Belt, South Africa.Goldschmidt Conference 2008, Abstract p.A475.Africa, South AfricaGeochronology
DS200812-1307
2008
Zeh, A.Zeh, A., Gerdes, A., Klemd, R., Barton, J.M.U Pb and Lu Hf isotope record of detrital zircon grains from the Limpopo Belt - evidence for crustal recycling at the Hadean to Early Archean transition.Geochimica et Cosmochimica Acta, Vol. 72, 21, Nov. 1, pp. 5304-5329.Africa, ZimbabweGeochronology
DS201112-1157
2011
Zeh, A.Zeh, A., Gerdes, A., Millonig, L.Hafnium isotope record of the Ancient Gneiss Complex, Swaziland, southern Africa: evidence for Archean crust-mantle formation and crust reworking between 3.66 and 2.73 Ga.Journal of the Geological Society, Vol. 168, pp. 953-964.Africa, SwazilandGeochronology
DS201412-0321
2014
Zeh, 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
DS201512-1971
2015
Zeh, A.Solgadi, F., Groulier, P.A, Moukhsil, A., Ohnenstetter, D., Andre-Mayer, A.S., Zeh, A.Nb-Ta-REE mineralization associated with the Crevier alkaline intrusion.Symposium on critical and strategic materials, British Columbia Geological Survey Paper 2015-3, held Nov. 13-14, pp. 69-74.Canada, QuebecAlkalic

Abstract: The Crevier alkaline intrusion is in the Grenville Province, north of the Lac Saint-Jean region of Québec (Fig. 1). It covers ~25 km2 (Bergeron, 1980) and intrudes charnockitic suites in the allochthon belt defi ned by Rivers et al. (1989). This intrusion has a U-Pb zircon age of 957.5 ± 2.9 Ma (Groulier et al., 2014) and is oriented N320°, along the axis of crustal weakness known as the Waswanipi-Saguenay corridor (Bernier and Moorhead, 2000). This corridor is related to the Saguenay graben, which hosts the Saint-Honoré (Niobec) Nb-Ta-REE deposit and Montviel REE deposit. The age of the Saint-Honoré carbonatite was estimated at 584 to 650 Ma (K-Ar whole rock; Vallée and Dubuc, 1970; Boily and Gosselin, 2004). The Montviel intrusion has a U-Pb zircon age of 1894 ± 3.5 Ma (David et al., 2006; Goutier, 2006). These crystallization ages are very different and cannot be related to a single event for the injection of alkaline intrusions. As mapped by Bergeron (1980), the Crevier alkaline intrusion is broadly composed of syenite and carbonatite rocks (Fig. 2). The Nb- Ta mineralization consists of pyrochlore hosted by a nepheline syenite dike swarm in the centre of the intrusion. The highest REE concentrations, up to 729 ppm La and 1465 ppm Ce, are at the edge of the Crevier alkaline intrusion (Niotaz sud showing; Fig. 2).
DS201711-2500
2017
Zehra, F.Asthana, D., Kumar, S., Kumar Vind, A., Zehra, F., Kumar, H., Pophare, A.M.Geochemical fingerprinting of ~ 2.5 Ga forearc-arc-backarc related magmatic suites in the Bastar Craton, central India.Journal of Asian Earth Sciences, in press available, 17p.Indiageodynamics

Abstract: The Pitepani volcanic suite of the Dongargarh Supergroup, central India comprises of a calc-alkaline suite and a tholeiitic suite, respectively. The rare earth element (REE) patterns, mantle normalized plots and relict clinopyroxene chemistry of the Pitepani calc-alkaline suite are akin to high-Mg andesites (HMA) and reveal remarkable similarity to the Cenozoic Setouchi HMA from Japan. The Pitepani HMAs are geochemically correlated with similar rocks in the Kotri-Dongargarh mobile belt (KDMB) and in the mafic dykes of the Bastar Craton. The rationale behind lithogeochemical correlations are that sanukitic HMAs represent fore-arc volcanism over a very limited period of time, under abnormally high temperature conditions and are excellent regional and tectonic time markers. Furthermore, the tholeiitic suites that are temporally and spatially associated with the HMAs in the KDMB and in the mafic dykes of the Bastar Craton are classified into: (a) a continental back-arc suite that are depleted in incompatible elements, and (b) a continental arc suite that are more depleted in incompatible elements, respectively. The HMA suite, the continental back-arc and continental arc suites are lithogeochemically correlated in the KDMB and in the mafic dykes of the Bastar Craton. The three geochemically distinct Neoarchaean magmatic suites are temporally and spatially related to each other and to an active continental margin. The identification of three active continental margin magmatic suites for the first time, provides a robust conceptual framework to unravel the Neoarchaean geodynamic evolution of the Bastar Craton. We propose an active continental margin along the Neoarchaen KDMB with eastward subduction coupled with slab roll back or preferably, ridge-subduction along the Central Indian Tectonic Zone (CITZ) to account for the three distinct magmatic suites and the Neoarchean geodynamic evolution of the Bastar Craton.
DS201805-0933
2018
Zehra, F.Asthana, D., Kumar, S., Vind, A.K., Zehra, F., Kumar, H., Pophare, A.M.Geochemical fingerprinting of ~2.5 Ga forearc-arc-backarc related magmatic suites in the Bastar Craton, central India.Journal of Asian Earth Sciences, Vol. 157, pp. 218-234.IndiaCraton

Abstract: The Pitepani volcanic suite of the Dongargarh Supergroup, central India comprises of a calc-alkaline suite and a tholeiitic suite, respectively. The rare earth element (REE) patterns, mantle normalized plots and relict clinopyroxene chemistry of the Pitepani calc-alkaline suite are akin to high-Mg andesites (HMA) and reveal remarkable similarity to the Cenozoic Setouchi HMA from Japan. The Pitepani HMAs are geochemically correlated with similar rocks in the Kotri-Dongargarh mobile belt (KDMB) and in the mafic dykes of the Bastar Craton. The rationale behind lithogeochemical correlations are that sanukitic HMAs represent fore-arc volcanism over a very limited period of time, under abnormally high temperature conditions and are excellent regional and tectonic time markers. Furthermore, the tholeiitic suites that are temporally and spatially associated with the HMAs in the KDMB and in the mafic dykes of the Bastar Craton are classified into: (a) a continental back-arc suite that are depleted in incompatible elements, and (b) a continental arc suite that are more depleted in incompatible elements, respectively. The HMA suite, the continental back-arc and continental arc suites are lithogeochemically correlated in the KDMB and in the mafic dykes of the Bastar Craton. The three geochemically distinct Neoarchaean magmatic suites are temporally and spatially related to each other and to an active continental margin. The identification of three active continental margin magmatic suites for the first time, provides a robust conceptual framework to unravel the Neoarchaean geodynamic evolution of the Bastar Craton. We propose an active continental margin along the Neoarchaen KDMB with eastward subduction coupled with slab roll back or preferably, ridge-subduction along the Central Indian Tectonic Zone (CITZ) to account for the three distinct magmatic suites and the Neoarchean geodynamic evolution of the Bastar Craton.
DS1991-1922
1991
Zeil, P.Zeil, P., Volk, P., Saradeth, S.Geophysical methods for lineament studies in groundwater exploration: acase history from southeast BotswanaGeoexploration, Vol. 27, No. 1-2, February pp. 165-178BotswanaGeophysics, Lineaments
DS1995-2122
1995
Zeilik, B.S.Zeilik, B.S.Probability of existance of rich gem quality diamonds depositsProceedings of the Sixth International Kimberlite Conference Abstracts, pp. 682-683.Russia, KazakhstanDiamond, Metamorphic
DS1991-1923
1991
Zeilinga de Boer, J.Zeilinga de Boer, J., Defant, M.J., Stewart, R.H., Bellon, H.Evidence for active subduction below western PanamaGeology, Vol. 19, No. 6, June pp. 649-652GlobalGeochronology, Geophysics
DS2002-1414
2002
Zeilinger, G.Schaltegger, U., Zeilinger, G., Frank, M., Burg, J.P.Multiple mantle sources during island arc magmatism. U Pb and Hf isotopic evidence from the Kohistan arc complex, Pakistan.Terra Nova, Vol. 14, 6, pp. 46-8.PakistanMagmatism - not specific to diamonds. Geochronology
DS1992-1731
1992
Zeintek, M.L.Zeintek, M.L., Pardiarto, B., Simandjuntak, H.R.W., Wikrama, A.Placer and lode platinum group minerals in South Kalimantan, Indonesia:Australian Journal of Earth Sciences, Vol. 39, No. 3, Part 2, July pp. 405-418Indonesia, KalimantanAlluvials -not specific to diamonds, Ultramafics
DS1975-0899
1978
Zeissink, H.E.Zeissink, H.E.Yambarra Diamond ProspectIn: Prospectus of Ashton Mining N.l., P. 19; P. 21.Australia, Northern TerritoryStuart Block, Fitzmaurice Belt, Prospecting
DS1990-1619
1990
Zeitler, K.M.Zeitler, K.M.The globalization of the mining and exploration businessPreprint from PDA, March 1990 (Pres. and CEO of Metall Mining Corporation, 13pGlobalEconomics, Exploration overview -Falconbridge
DS1997-0429
1997
Zeitler, P.K.Gorring, M.L., Kay, S.M., Zeitler, P.K., et al.Neogene Patagonian plateau lavas: continental magmas associated with ridge collision Chile Triple junctionTectonics, Vol. 16, No. 1, Feb. pp. 1-17ChileTectonics, Subduction
DS201805-0962
2018
Zeitler, P.K.McDannell, K.T., Zeitler, P.K., Schneider, D.A.Instability of the southern Canadian Shield during the late Proterozoic.Earth Planetary Science Letters, Vol. 490, pp. 100-109.Canadacraton

Abstract: Cratons are generally considered to comprise lithosphere that has remained tectonically quiescent for billions of years. Direct evidence for stability is mainly founded in the Phanerozoic sedimentary record and low-temperature thermochronology, but for extensive parts of Canada, earlier stability has been inferred due to the lack of an extensive rock record in both time and space. We used 40Ar/39Ar multi-diffusion domain (MDD) analysis of K-feldspar to constrain cratonic thermal histories across an intermediate (~150-350°C) temperature range in an attempt to link published high-temperature geochronology that resolves the timing of orogenesis and metamorphism with lower-temperature data suited for upper-crustal burial and unroofing histories. This work is focused on understanding the transition from Archean-Paleoproterozoic crustal growth to later intervals of stability, and how uninterrupted that record is throughout Earth’s Proterozoic "Middle Age." Intermediate-temperature thermal histories of cratonic rocks at well-constrained localities within the southern Canadian Shield of North America challenge the stability worldview because our data indicate that these rocks were at elevated temperatures in the Proterozoic. Feldspars from granitic rocks collected at the surface cooled at rates of <0.5°C/Ma subsequent to orogenesis, seemingly characteristic of cratonic lithosphere, but modeled thermal histories suggest that at ca. 1.1-1.0 Ga these rocks were still near ~200°C - signaling either reheating, or prolonged residence at mid-crustal depths assuming a normal cratonic geothermal gradient. After 1.0 Ga, the regions we sampled then underwent further cooling such that they were at or near the surface (<< 60°C) in the early Paleozoic. Explaining mid-crustal residence at 1.0 Ga is challenging. A widespread, prolonged reheating history via burial is not supported by stratigraphic information, however assuming a purely monotonic cooling history requires at the very least 5 km of exhumation beginning at ca. 1.0 Ga. A possible explanation may be found in evidence of magmatic underplating that thickened the crust, driving uplift and erosion. The timing of this underplating coincides with Mid-Continent extension, Grenville orogenesis, and assembly of the supercontinent Rodinia. 40Ar/39Ar MDD data demonstrate that this technique can be successfully applied to older rocks and fill in a large observational gap. These data also raise questions about the evolution of cratons during the Proterozoic and the nature of cratonic stability across deep time.
DS201810-2354
2018
Zeitler, P.K.McDannell, K.T., Zeitler, P.K., Schneider, D.A.Instability of the southern Canadian shield during the Late Proterozoic.researchgate.com, 29p. PdfCanadacraton

Abstract: Cratons are generally considered to comprise lithosphere that has remained tectonically quiescent for billions of years. Direct evidence for stability is mainly founded in the Phanerozoic sedimentary record and low-temperature thermochronology, but for extensive parts of Canada, earlier stability has been inferred due to the lack of an extensive rock record in both time and space. We used 40Ar/39Ar multi-diffusion domain (MDD) analysis of K-feldspar to constrain cratonic thermal histories across an intermediate (~150-350?°C) temperature range in an attempt to link published high-temperature geochronology that resolves the timing of orogenesis and metamorphism with lower-temperature data suited for upper-crustal burial and unroofing histories. This work is focused on understanding the transition from Archean-Paleoproterozoic crustal growth to later intervals of stability, and how uninterrupted that record is throughout Earth's Proterozoic “Middle Age.” Intermediate-temperature thermal histories of cratonic rocks at well-constrained localities within the southern Canadian Shield of North America challenge the stability worldview because our data indicate that these rocks were at elevated temperatures in the Proterozoic. Feldspars from granitic rocks collected at the surface cooled at rates of <0.5?°C/Ma subsequent to orogenesis, seemingly characteristic of cratonic lithosphere, but modeled thermal histories suggest that at ca. 1.1-1.0 Ga these rocks were still near ~200?°C - signaling either reheating, or prolonged residence at mid-crustal depths assuming a normal cratonic geothermal gradient. After 1.0 Ga, the regions we sampled then underwent further cooling such that they were at or near the surface («60?°C) in the early Paleozoic. Explaining mid-crustal residence at 1.0 Ga is challenging. A widespread, prolonged reheating history via burial is not supported by stratigraphic information, however assuming a purely monotonic cooling history requires at the very least 5 km of exhumation beginning at ca. 1.0 Ga. A possible explanation may be found in evidence of magmatic underplating that thickened the crust, driving uplift and erosion. The timing of this underplating coincides with Mid-Continent extension, Grenville orogenesis, and assembly of the supercontinent Rodinia. 40Ar/39Ar MDD data demonstrate that this technique can be successfully applied to older rocks and fill in a large observational gap. These data also raise questions about the evolution of cratons during the Proterozoic and the nature of cratonic stability across deep time.
DS202012-2215
2020
Zeitler, P.K.Gautheron, C., Zeitler, P.K.Noble gases deliver cool dates from hot rocks. Elements, Vol. 16, pp. 303-309.MantleThermochronology

Abstract: Heat transfer in the solid Earth drives processes that modify temperatures, leaving behind a clear signature that we can measure using noble gas thermochronology. This allows us to record the thermal histories of rocks and obtain the timing, rate, and magnitude of phenomena such as erosion, deformation, and fluid flow. This is done by measuring the net balance between the accumulation of noble gas atoms from radioactive decay and their loss by temperature-activated diffusion in mineral grains. Together with knowledge about noble gas diffusion in common minerals, we can then use inverse models of this accumulation-diffusion balance to recover thermal histories. This approach is now a mainstream method by which to study geodynamics and Earth evolution.
DS1995-1974
1995
Zeitler. P.K.Vandervoot, D.S., Jordan, R.E., Zeitler. P.K., Alonso, R.N.Chronology of internal drainage and uplift southern Puna plateau, Argentine central AndesGeology, Vol. 23, No. 2, Feb. pp. 145-148Andes, ArgentinaGeochronology, Tectonics
DS1975-1267
1979
Zeitner, J.C.Zeitner, J.C.Diamonds Are UniversalLapidary Journal, Vol. 33, No. 1, P. 284.GlobalHistory, Diamonds Notable
DS1984-0791
1984
Zeitner, J.C.Zeitner, J.C.Some Record Setting Gems of the World. DiamondsLapidary Journal, Vol. 3, No. 11, P. 1580.GlobalDiamonds Notable, Size, Names
DS1984-0792
1984
Zeitner, J.C.Zeitner, J.C.Collect Emeralds, Diamonds, Rubies and More for a FeeLapidary Journal, Vol. 38, No. 1, PP. 62-77.United States, New YorkProspecting, Herkimer
DS1988-0778
1988
Zeitner, J.C.Zeitner, J.C.U.S. diamond prospectsLapidary Journal, Vol. 41, No. 12, March pp. 21, 22, 24, 26, 27ArkansasOverview, Diamond prospecting activ
DS1991-1924
1991
Zeitner, J.C.Zeitner, J.C.The Lewis and Clark diamondLapidary Journal, Vol. 45, No. 5, August pp. 79-88MontanaDiamond notable, Lewis and Clark
DS1860-1051
1898
Zeitschr. F. Prakt. GeolZeitschr. F. Prakt. GeolDie Diamanten AustraliensZeitschr. F. Prakt. Geol., P. 405.Australia, New South WalesDiamond Occurrence
DS1900-0007
1900
Zeitschrift fur Prakt. GeologisheZeitschrift fur Prakt. GeologisheDiamant Production #3Zeitschr. F. Prakt. Geol., Vol. 8, P. 335.Africa, South AfricaDiamond Production
DS1900-0157
1903
Zeitschrift fur Prakt. GeologisheZeitschrift fur Prakt. GeologisheDiamanten ProduktionZeitschr. F. Prakt. Geol., Vol. 11, P. 188.Africa, South AfricaMining Economics, Statistics
DS1900-0230
1904
Zeitschrift fur Prakt. GeologisheZeitschrift fur Prakt. GeologisheDiamant Production #2Zeitschr. F. Prakt. Geol., Vol. 12, P. 67; P. 110; P. 188.Africa, South AfricaDiamond Production
DS1900-0296
1905
Zeitschrift fur Prakt. GeologisheZeitschrift fur Prakt. GeologisheDiamant Production #5Zeitschr. F. Prakt. Geol., Vol. 13, PP. 382-383.Africa, South AfricaDiamond Production
DS1900-0299
1905
Zeitschrift fur Prakt. GeologisheZeitschrift fur Prakt. GeologisheDiamanten ProduktionZeitschr. F. Prakt. Geol., Vol. 13, PP. 382-383.Africa, South AfricaMining Economics
DS1900-0639
1908
Zeitschrift fur Prakt. GeologisheZeitschrift fur Prakt. GeologisheDiamant Funde in ArkansasZeitschrift Min., Vol. 2, JULY 31ST. PP. 188-191.United States, Gulf Coast, Arkansas, PennsylvaniaDiamond Occurrence
DS1960-0770
1966
Zeitz, I.Zeitz, I.Crustal Study of a Continental Strip from the Atlantic Ocean to the Rocky Mountains.Geological Society of America (GSA) Bulletin., Vol. 77, PP. 1427-1448.GlobalMid-continent
DS1970-0326
1971
Zeitz, I.King, E.R., Zeitz, I.Aeromagnetic Study of the Midcontinent Gravity High of Central United States.Geological Society of America (GSA) Bulletin., Vol. 82, No. 8, PP. 2187-2207.GlobalGeophysics, Mid-continent
DS1975-0632
1977
Zeitz, I.Stewart, J.H., Moore, W.J., Zeitz, I.East-west Patterns of Cenozoic Igneous Rocks, Aeromagnetic Anomalies and Mineral Deposits, Nevada and Utah.Geological Society of America (GSA) Bulletin., Vol. 88, PP. 67-77.GlobalMid-continent, Geophysics
DS1986-0074
1986
Zeitz, I.Bickford, M.E., Van Schmus, W.R., Zeitz, I.Proterozoic history of the mid-continent region of North AmericaGeology, Vol. 14, No. 6, June pp. 492-496MidcontinentTectonics
DS1994-0849
1994
Zeitz, I.Johnson, P.R., Zeitz, I., Thomas, W.A.Possible Neoproterozoic-early Paleozoic grabens in Mississippi, Alabama, and Tennessee.Geology, Vol. 22, No. 1, January pp. 11-14.Mississippi, Alabama, TennesseeTectonics, Grabens
DS2002-0676
2002
Zeitz, I.Hatcher, R.D., Zeitz, I.Crustal structure of the U.S. east of the Rockies from gravity and magnetic dat a and correlations..intraplate16th. International Conference On Basement Tectonics '02, Abstracts, 2p., 2p.AppalachiaGeophysics - seismics, Tectonics
DS1989-1370
1989
ZekaiSen, ZekaiCumulative semivariogram models of regionalized variablesMathematical Geology, Vol. 21, No. 8, November pp. 891-904GlobalGeostatistics, SemivariograM.
DS1992-1368
1992
ZekaiSen, ZekaiStandard cumulative semivariograms of stationary stochastic processes and regional correlationMathematical Geology, Vol. 24, No. 4, pp. 417-435GlobalComputers -semivariograms, Geostatistics
DS1987-0829
1987
Zekulin, A.Zekulin, A.Crustal and upper mantle velocity structure along the Appalachian foredeep in southern Ohio, Eastern Kentucky and Eastern TennesseeEos, abstractKentuckyTennessee, Appalachia
DS1990-1620
1990
Zelek, J.S.Zelek, J.S.Computer aided linear planimetric feature extractionIeee Transactions Of Geoscience And Remote Sensing, Vol. 28, No. 4, July pp. 567-572GlobalRemote sensing, Computer aided
DS201905-1075
2019
Zelemovskiy, P.S.Shchepetova, O.V., Korsakov, A.V., Zelemovskiy, P.S., Mikhailenko, D.S.The mechanism of disordered graphite formation in UHP diamond bearing complexes.Doklady Earth Sciences, Vol. 484, 1, pp. 84-88.RussiaUHP

Abstract: Kyanite gneiss from the “New Barchinsky” locality (Kokchetav Massif) was studied in detail. This rock is characterized by zonal distribution of the C and SiO2 polymorphs in kyanite porphyroblasts: (1) cores with graphite and quartz inclusions; (2) clean overgrowth zone with inclusions of cuboctahedral diamond crystals. The Raman mapping of SiO2 polymorphs originally showed the presence of an association of disordered graphite + coesite “prohibited” in HT diamond-bearing rocks. Graphitization of diamond is the only likely mechanism of the disordered graphite formation in HT diamond-bearing rocks. However, the absence of disordered graphite in association with diamond in kyanite porphyroblasts from kyanite gneiss from the “New Barchinsky” locality eliminates the process of diamond graphitization at the retrograde stage. Most likely, crystallization of disordered graphite occurred at the retrograde stage from the UHP C-O-H fluid.
DS201610-1888
2016
Zelenovskiy, P.S.Mikhailenko, D.S., Korsakov, A.V., Golovin, A.V., Zelenovskiy, P.S., Pohilenko, N.P.The first finding of graphite inclusion in diamond from mantle rocks: the result of the study of eclogite xenolith from Udachnaya pipe ( Siberian craton).Doklady Earth Sciences, Vol. 469, 2, pp. 870-873.RussiaDeposit - Udachnaya

Abstract: A xenolith of eclogite from the kimberlite pipe Udachnaya-East, Yakutia Grt+Cpx+Ky + S + Coe/Qtz + Dia + Gr has been studied. Graphite inclusions in diamond have been studied in detail by Confocal Raman (CR) mapping. The graphite inclusion in diamond has a highly ordered structure and is characterized by a substantial shift in the band (about 1580 cm-1) by 7 cm-1, indicating a significant residual strain in the inclusion. According to the results of FTIR spectroscopic studies of diamond crystals, a high degree of nitrogen aggregation has been detected: it is present mainly in form A, which means an "ancient" age of the diamonds. In the xenolith studied, the diamond formation occurred about 1 Byr, long before their transport by the kimberlite melt, and the conditions of the final equilibrium were temperatures of 1020 ± 40°C at 4.7 GPa. Thus, these graphite inclusions found in a diamond are the first evidence of crystallization of metastable graphite in a diamond stability field. They were formed in rocks of the upper mantle significantly below (=20 km) the graphite-diamond equilibrium line.
DS201611-2124
2016
Zelenovskiy, P.S.Mikhailenko, D.S., Korsakov, A.V., Zelenovskiy, P.S., Golovin, A.V.Graphite diamond relations in mantle rocks: evidence from an eclogitic xenolith from the Udachnaya kimberlite, ( Siberian craton).American Mineralogist, Vol. 101, pp. 2155-2167.RussiaDeposit - Udachnaya

Abstract: Relations of graphite and diamond have been studied in a garnet-kyanite-clinopyroxene+sulfide+coesite/quartz+diamond+graphite eclogite xenolith from the Udachnaya-East kimberlite pipe in the Yakutian diamond province. Euhedral crystals of diamond and graphite occur in the intra- and intergranular space. The equilibrium conditions of diamond formation reconstructed by geothermobarometry for the Grt-Cpx-Ky-Coe mineral assemblage are 1020 ± 40 °C and 4.7 GPa. Raman imaging of graphite enclosed in diamond shows high ordering and a 9 cm-1 shift of the ~1580 cm-1 band. This Raman shift of graphite, as well as a 5 cm-1 shift of the 1332 cm-1 band of diamond, indicate large residual stress in graphite and in diamond around the inclusion, respectively. According to FTIR spectroscopy, nitrogen in diamond is highly aggregated and exists mainly as the A centers, while no other phases occur near graphite inclusions. Therefore, diamond in the analyzed eclogite sample must be quite old: it likely had crystallized long (~1 Byr) before it became entrained with kimberlite melt. New data show that graphite can stay in the upper mantle for billions of years without converting to diamond. Crystallization of various carbon polymorphs, both in laboratory and natural systems, remains poorly constrained. Graphite present in mantle and UHP rocks may be a metastable phase crystallized in the diamond stability field. This fact should be taken into consideration when deducing petrological constrains and distinguishing diamond and graphite subfacies in upper mantle.
DS202008-1438
2019
Zelenovskiy, P.S.Rezvukhina, O.V., Korsakov, A.V., Rezvukin, D.I., Zamyatin, D.A., Zelenovskiy, P.S., Greshnyakov, E.D., Shur, V.Y.A combined Raman spectroscopy, cathodoluminescence, and electron backscatter diffraction study of kyanite porphyroblasts from diamondiferous and diamond-free metamorphic rocks ( Kokchetav Massif).Journal of Raman Spectroscopy, 13p. PdfRussialuminescence

Abstract: A series of precise nondestructive analytical methods (Raman spectroscopy, cathodoluminescence, and EBSD—electron backscatter diffraction) has been employed to investigate the internal textures of kyanite porphyroblasts from diamondiferous and diamond-free ultrahigh-pressure metamorphic rocks (Kokchetav massif, Northern Kazakhstan). Such internal kyanite characteristics as twinning, radial fibrous pattern, and spotty zoning were identified by means of Raman and cathodoluminescence imaging, whereas an intergrowth of two kyanite crystals was distinguished only by Raman imaging. The EBSD analysis recorded an ~10-25° changing of orientations along the elongation in the investigated kyanite porphyroblasts. The absence of a radial fibrous pattern and a spotty zoning on the EBSD maps indicates that these textures are not related to variations in crystallographic orientation. The absence of clear zoning patterns (cores, mantles, and rims) on the Raman, cathodoluminescence, or EBSD maps of the kyanite porphyroblasts indicates the rapid single-stage formation of these porphyroblasts near the peak metamorphic conditions and the lack of recrystallization processes. The obtained results provide important implications for deciphering of mineral internal textures, showing that the data obtained by cathodoluminescence mapping can be clearly reproduced by Raman imaging, with the latter method occasionally being even more informative. This observation is of significant importance for the study of minerals that are unexposed on a thin section surface or Fe- and Ni-rich minerals that do not show luminescence emission. The combination of the Raman spectroscopic, cathodoluminescence, and EBSD techniques may provide better spatial resolution for distinguishing different domains and textural peculiarities of mineral than the selective application of individual approaches.
DS202008-1411
2020
Zelenski, M.E.Korneeva, A.A., Nikolai, N.A., Kamenetsky, V.S., Portnyagin, M.V., Savelyev, D.P., Krasheninnikov, S.P., Abersteiner, A., Kamenetsky, M.B., Zelenski, M.E., Shcherbakov, V.D., Botcharnikov, R.E.Composition, crystallization conditions and genesis of sulfide saturated parental melts of olivine-phyric rocks from Kamchatsky Mys ( Kamchatka, Russia).Lithos, 10.1016/j.lithos.2020.105657Russia, Kamchatkapicrites

Abstract: Sulfide liquids that immiscibly separate from silicate melts in different magmatic processes accumulate chalcophile metals and may represent important sources of the metals in Earth's crust for the formation of ore deposits. Sulfide phases commonly found in some primitive mid-ocean ridge basalts (MORB) may support the occurrence of sulfide immiscibility in the crust without requiring magma contamination and/or extensive fractionation. However, the records of incipient sulfide melts in equilibrium with primitive high-Mg olivine and Cr-spinel are scarce. Sulfide globules in olivine phenocrysts in picritic rocks of MORB-affinity at Kamchatsky Mys (Eastern Kamchatka, Russia) represent a well-documented example of natural immiscibility in primitive oceanic magmas. Our study examines the conditions of silicate-sulfide immiscibility in these magmas by reporting high precision data on the compositions of Cr-spinel and silicate melt inclusions, hosted in Mg-rich olivine (86.9-90 mol% Fo), which also contain globules of magmatic sulfide melt. Major and trace element contents of reconstructed parental silicate melts, redox conditions (?QFM = +0.1 ± 0.16 (1s) log. units) and crystallization temperature (1200-1285 °C), as well as mantle potential temperatures (~1350 °C), correspond to typical MORB values. We show that nearly 50% of sulfur could be captured in daughter sulfide globules even in reheated melt inclusions, which could lead to a significant underestimation of sulfur content in reconstructed silicate melts. The saturation of these melts in sulfur appears to be unrelated to the effects of melt crystallization and crustal assimilation, so we discuss the reasons for the S variations in reconstructed melts and the influence of pressure and other parameters on the SCSS (Sulfur Content at Sulfide Saturation).
DS1900-0722
1908
Zelizko, .V.Zelizko, .V.Kimberlite a Puvod Kapskych Diamantu Ziva Casopis Prirodovedecky.Ig (prague), Vol. 18, PP. 218-219.Africa, South AfricaGeology, Diamond, Kimberlite
DS1987-0771
1987
Zeller, E.J.Voveney, R.M.Jr., Goebel, E.D., Zeller, E.J., Dreschhoff, G.A.M.Serpentinization and the origin of hydrogen gas in KansasAmerican Association of Petroleum Geologists (AAPG) Bulletin, Vol. 71, No. 1 Jan. pp. 39-48KansasMidcontinent, Tectonics
DS1993-0370
1993
Zeller, E.J.Dort, W.Jr., Zeller, E.J.Extensive late-Quaternary faulting in the Mid-continent Great PlainsGeological Society of America Annual Abstract Volume, Vol. 25, No. 6, p. A70 abstract onlyNebraskaTectonics, Structure -faults
DS201212-0709
2012
Zellmer, G.F.Straub, S.M., Zellmer, G.F.Volcanic arcs as archives of plate tectonic change.Gondwana Research, Vol 21, 2-3, pp. 495-516.GlobalSubduction
DS201610-1877
2016
Zellmer, G.F.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
Zellmer, G.F.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.
DS1998-0435
1998
Zelt, C.Flueh, E.R., Vidal, N., Zelt, C.Seismic investigation of the continental margin off and on shore ValparaisoChileTectonophysics, Vol. 288, No. 1-4, Mar. pp. 251-264ChileTectonics, Geophysics - seismic
DS200512-0624
2005
Zelt, C.Levander, A., Zelt, C., Magnani, M.B.Crust and upper mantle velocity structure of the Southern Rocky Mountains from the Jemez Lineament to the Cheyenne Belt.American Geophysical Union, Geophysical Monograph, No. 154, pp. 293-308.United States,Wyoming, Colorado PlateauGeophysics - seismics, tectonics
DS202002-0205
2019
Zelt, C.Mazuera, F., Schmitz, M., Escalona, A., Zelt, C., Levander, A.Lithospheric structure of northwestern Venezuela from wide angle seismic data: implications for the understanding of continental margin evolution.Journal of Geophysical Research: Solid Earth, Vol. 124, 12, pp. 13124-131249. ( open access)South America, Venezuelageophysics - seismic

Abstract: Northwestern Venezuela is located in the complex deformation zone between the Caribbean and South American plates. Several models regarding the lithospheric structure of the Mérida Andes have been proposed. Nevertheless, they lack relevant structural information in order to support the interpretation of deeper structures. Therefore, a 560-km-long refraction profile across the northern part of Mérida Andes, oriented in a NNW direction, covering areas from the Proterozoic basement in the south, to both Paleozoic and Meso-Cenozoic terranes of northwestern Venezuela to the north, is analyzed in this contribution. Thirteen land shots were recorded by 545 short-deployment seismometers, constraining P wave velocity models from first-arrival seismic tomography and layer-based inversion covering the whole crust in detail, with some hints to upper mantle structures. The most prominent features imaged are absence of a crustal root associated to the Mérida Andes, as the Northern Andes profile is located marginal to the Andean crustal domain, and low-angle subduction of the Caribbean oceanic slab (~10-20°) beneath northwestern South America. Further crustal structures identified in the profile are (a) crustal thinning beneath the Falcón Basin along the western extension of the Oca-Ancón fault system interpreted as a back-arc basin; (b) suture zones between both the Proterozoic and Paleozoic provinces (Ouachita-Marathon-related suture?), and Paleozoic and Meso-Cenozoic terranes (peri-Caribbean suture) interpreted from lateral changes in seismic velocity; and (c) evidence of a deep Paleozoic(?) extensional basin, underlying thick Mesozoic and Cenozoic sequences (beneath the Guárico area).
DS1989-1453
1989
Zelt, C.A.Stephenson, R.A., Zelt, C.A., et al.Crust and upper mantle structure and the origin of the Peace River archBulletin. Can. Petroleum Geol, Vol. 37, No. 2, June ppp. 224-235AlbertaTectonics, Structure/mantle
DS1990-1621
1990
Zelt, C.A.Zelt, C.A., Ellis, R.M.Crust and mantle Q from seismic refraction data: Peace River regionCanadian Journal of Earth Sciences, Vol. 27, pp. 1040-7.AlbertaGeophysics - seismics, Peace River area
DS1994-1980
1994
Zelt, C.A.Zelt, C.A., Forsyth, D.A.Modeling wide angle seismic dat a for crustal structure: southeastern Grenville ProvinceJournal of Geophy. Res, Vol. 99, B6, June 10, pp. 11, 687-704OntarioGeophysics - seismics, Grenville
DS1994-1981
1994
Zelt, C.A.Zelt, C.A., Forsyth, D.A., et al.Seismic structure of the Central Metasedimentary Belt, southern GrenvilleProvince.Canadian Journal of Earth Sciences, Vol. 31, No. 2, Feb. pp. 243-254.OntarioLithoprobe -Grenville, Geophysics -seismics
DS1995-2123
1995
Zelt, C.A.Zelt, C.A., White, D.J.Crustal structure and tectonics of the southeastern Canadian CordilleraJournal of Geophysical Research, Vol. 100, No. B12, Dec. 10, pp. 24, 255-273.British ColumbiaProterozoic rifting, Tectonics
DS1995-2124
1995
Zelt, C.A.Zelt, C.A., White, D.J.Crustal structure and tectonics of the southeastern Canadian CordilleraJournal of Geophysical Research, Vol. 100, No. B12, Dec. 10, pp. 24, 255-73British ColumbiaTectonics, Crustal structure
DS2001-1074
2001
ZemingShutian, S., Zengqui, Z., Zhendong, ZemingPost collisional ductile extensional tectonic framework in the ultra high pressure (UHP) and HP metamorphic belts in Dabie Sulu areaActa Geol. Sinica, Vol. 75, No. 2, pp. 151-60.Chinaultra high pressure (UHP), Tectonics
DS200512-1234
2005
Zeming, Z.Zeming, Z., Kun, S., Van den Kerkhof, A.M., Hoefs, J., Liou, J.G.Fluid composition and evolution attending UHP metamorphism: study of fluid inclusions from drill cores, southern Sulu Belt, eastern China.International Geology Review, Vol. 47, 3, pp. 297-309.ChinaUHP
DS1998-1191
1998
Zemlyanukhin, V.N.Prikhodko, V.S., Zemlyanukhin, V.N.Petrology of spinel peridotite xenoliths from Cenozoic basaltoids in the Khanka Craton terrain.7th. Kimberlite Conference abstract, pp. 716.Russia, Central AsiaGeochemistry, Craton - Khankaisk. Bureinsk
DS201804-0740
2018
Zemnuhov, A.L.Sonin, V.M., Zhimulev, E.I., Pomazanskiy, B.S., Zemnuhov, A.L., Chepurov, A.A., Afanasiev, V.P., Chepurov, A.I.Morphological features of diamond crystals dissolved in Fe0.7 S0.3 melt at 4GPa and 1400.Geology of Ore Deposits, Vol. 60, pp. 82-92.Technologydiamond morphology

Abstract: An experimental study of the dissolution of natural and synthetic diamonds in a sulfur-bearing iron melt (Fe0.7S0.3) with high P-T parameters (4 GPa, 1400°?) was performed. The results demonstrated that under these conditions, octahedral crystals with flat faces and rounded tetrahexahedral diamond crystals are transformed into rounded octahedroids, which have morphological characteristics similar to those of natural diamonds from kimberlite. It was suggested that, taking into account the complex history of individual natural diamond crystals, including the dissolution stages, sulfur-bearing metal melts up to sulfide melts were not only diamond-forming media during the early evolution of the Earth, but also natural solvents of diamond in the mantle environment before the formation of kimberlitic melts.
DS201901-0059
2017
Zemnukhov, A.Ragozin, A., Zedgenizov, D., Kuper, K., Kalimina, V., Zemnukhov, A.The internal structure of yellow cuboid diamonds from alluvial placers of the northeastern Siberian platform.Crystals MDPI, Vol. 7, 8, 13p. Doi.org/10. 3390/cryst7080238Russiadiamond morphology

Abstract: Yellow cuboid diamonds are commonly found in diamondiferous alluvial placers of the Northeastern Siberian platform. The internal structure of these diamonds have been studied by optical microscopy, X-Ray topography (XRT) and electron backscatter diffraction (EBSD) techniques. Most of these crystals have typical resorption features and do not preserve primary growth morphology. The resorption leads to an evolution from an originally cubic shape to a rounded tetrahexahedroid. Specific fibrous or columnar internal structure of yellow cuboid diamonds has been revealed. Most of them are strongly deformed. Misorientations of the crystal lattice, found in the samples, may be caused by strains from their fibrous growth or/and post-growth plastic deformation.
DS201412-0683
2014
Zemnukhov, A.L.Petrovsky, V.A., Silaev, V.I., Sukharev, A.E., Vasilyev, E.A., Pomazansky, B.S., Zemnukhov, A.L.Yakutites: mineralogical geochemical properties and new version of the genesis. Part 1.Izvestiya VUZ'ov Geologia I Razvedka ** in Russia Courtesy of Felix, No. 3, pp. 24-33.Russia, YakutiaCarbonado, with lonsdaleite
DS201412-0825
2014
Zemnukhov, A.L.Silaev, V.I., Petrovsky, V.A., Sukharev, A.E., Smoleva, I.V., Pomazansky, B.S., Zemnukhov, A.L.Yakutites: mineralogical geochemical properties and new version of the genesis. Part 2.Izvestiya VUZ'ov Geologia I Razvedka ** in Russia Courtesy of Felix, No. 4, pp. 12-22.TechnologyYakutites
DS202011-2070
2020
Zemnukhov, A.L.Zemnukhov, A.L., Reutsky, V.N., Zedgenizov, D.A., Ragozin, A.L., Zhelonkin, R.Y., Kalinina, V.V.Subduction related population of diamonds in Yakutian placers, northeastern Siberian platform.Contributions to Mineralogy and Petrology, Vol. 175, 98 10.1007/s00410-020-01741-w 11p. PdfRussia, Yakutiadiamond crystallography

Abstract: The 35 paired diamond intergrowths of rounded colorless transparent and gray opaque crystals from the placers of northeastern Siberian Platform were investigated. Mineral inclusions (KFsp, Coe, E-Grt, Po) detected in studied samples belong to eclogitic paragenesis. The majority of studied samples have uniform ranges of nitrogen content (1126-1982 at. ppm) and carbon isotope composition (-?16.8 to -?23.2 ‰). These characteristics pointing towards subducted material are possible sources for their genesis. Two samples consist of a gray opaque crystal with the subduction-related characteristics (d13C ca. -?21‰ and N ca. 1300 at. ppm) and a transparent crystal with low nitrogen content (412 and 29 at. ppm) and a heavy carbon isotopic composition (d13C -?4.2 and -?4.6‰) common for primary mantle range. The higher degree of nitrogen aggregation in the crystals with mantle-like characteristics testifies their longer storage in the mantle conditions. These samples reflect multistage diamond growth history and directly indicate the mixing of mantle and subduction carbon sources at the basement of subcontinental lithospheric mantle of northeastern Siberian Platform.
DS1989-1678
1989
ZenZen, E-AnPlumbing the depth of batholithsAmerican Journal of Science, Vol. 289, No. 10, December pp. 1137-1157GlobalBatholiths, Genesis
DS1995-2125
1995
ZenZen, 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
DS200612-1560
2006
ZengXu, Z., Wang, Q., Ji, S., Chen, J., Zeng, Yang, Chen, Liang, WenkPetrofabrics and seismic properties of garnet peridotite from the UHP Sulu terrane: implications for olivine deformation mechanism in subducting slab.Tectonophysics, Vol. 421, 1-2, pp. 111-127.MantleSubduction - cold, dry continental slab
DS200712-0005
2007
Zeng, F.Ai,Y., Chen, Q-F., Zeng, F., Hong, X., Ye, W.The crust and upper mantle structure beneath southeastern China.Earth and Planetary Science Letters, Vol. 260, 3-4, pp. 549-563.ChinaTectonics
DS1999-0827
1999
Zeng, H.Zeng, H., Wan, T.Gross differences between two isostatic gravity anomaly maps of ChinaTectonophysics, Vol. 306, No. 2, June 15, pp. 253-ChinaGeophysics - Gravity
DS200512-1214
2005
Zeng, L.Yang, T.N., Zeng, L., Liou, J.G.Mineral evolution of a garnet pyroxenite nodule within eclogite, eastern Sulu ultrahigh-pressure metamorphic terrane, east China.Journal of Metamorphic Geology, Vol. 23, 8, pp. 667-680.ChinaUHP
DS200612-1561
2006
Zeng, L.Xu, Z., Zeng, L., Liu, F., Yang, J., Zhang, Z., McWilliams, M., Liou, J.G.Polyphase subduction and exhumation of the Sulu high pressure ultrahigh pressure metamorphic terrane.Geological Society of America, Special Paper, No. 403, pp. 93-114.ChinaSubduction UHP
DS200712-1221
2007
Zeng, L.Zeng, L., Liu, F.Geochemical effects of deep subduction on the continental crustal materials.Plates, Plumes, and Paradigms, 1p. abstract p. A1154.MantleSubduction
DS200812-1293
2008
Zeng, L.Yang, T.N., Zeng, L., Zhao, Z.R., Liou, J.G.Retrograde reaction of an ultrahigh pressure metamorphic spinel pyroxenite lens, northeast Sulu UHP terrane, eastern China.International Geology Review, Vol. 50, 1, pp. 32-47.ChinaUHP
DS201808-1745
2018
Zeng, L.Garber, J.M., Maurya, S., Hernandez, J-A., Duncan, M.S., Zeng, L., Zhang, H.L., Faul, U., McCammon, C., Montagner, J-P., Moresi, L., Romanowicz, B.A., Rudnick, R.L., Stixrude, L.Multidisciplinary constraints on the abundance of diamond and eclogite in the cratonic lithosphere.G3 Geochemistry, Geophysics, Geosystems, http:/orchid.org/0000-0001-5313-0982Mantleeclogite
DS201809-2024
2018
Zeng, L.Garber, J.M., Maurya, S., Hernandez, J.A., Duncan, M.S., Zeng, L., Zhang, H.L.Multidisciplanary constraints on the abundance of diamond and eclogite in the cratonic lithosphere.Geochemistry, Geophysics, Geosystems, Vol. 19, 7, pp. 2062-2086. doi.org/10/1029/ 2018GC007534Mantlegeophysics - seismics

Abstract: Some seismic models derived from tomographic studies indicate elevated shear-wave velocities (=4.7 km/s) around 120-150 km depth in cratonic lithospheric mantle. These velocities are higher than those of cratonic peridotites, even assuming a cold cratonic geotherm (i.e., 35 mW/m2 surface heat flux) and accounting for compositional heterogeneity in cratonic peridotite xenoliths and the effects of anelasticity. We reviewed various geophysical and petrologic constraints on the nature of cratonic roots (seismic velocities, lithology/mineralogy, electrical conductivity, and gravity) and explored a range of permissible rock and mineral assemblages that can explain the high seismic velocities. These constraints suggest that diamond and eclogite are the most likely high-Vs candidates to explain the observed velocities, but matching the high shear-wave velocities requires either a large proportion of eclogite (>50 vol.%) or the presence of up to 3 vol.% diamond, with the exact values depending on peridotite and eclogite compositions and the geotherm. Both of these estimates are higher than predicted by observations made on natural samples from kimberlites. However, a combination of =20 vol.% eclogite and ~2 vol.% diamond may account for high shear-wave velocities, in proportions consistent with multiple geophysical observables, data from natural samples, and within mass balance constraints for global carbon. Our results further show that cratonic thermal structure need not be significantly cooler than determined from xenolith thermobarometry.
DS202009-1628
2018
Zeng, L.Garber, J.M., Maurya, S., Hernandez, J.A., Duncan, M.S., Zeng, L., Zhang, H.L.Multidisciplenary constraints on the abundance of diamond and eclogite in the cratonic lithosphere.Geochemistry, Geophysics, Geosystems, Vol. 19: https://doi.org/10.1029/2018GC007534Mantleeclogite

Abstract: Some seismic models derived from tomographic studies indicate elevated shear-wave velocities (=4.7 km/s) around 120-150 km depth in cratonic lithospheric mantle. These velocities are higher than those of cratonic peridotites, even assuming a cold cratonic geotherm (i.e., 35 mW/m2 surface heat flux) and accounting for compositional heterogeneity in cratonic peridotite xenoliths and the effects of anelasticity. We reviewed various geophysical and petrologic constraints on the nature of cratonic roots (seismic velocities, lithology/mineralogy, electrical conductivity, and gravity) and explored a range of permissible rock and mineral assemblages that can explain the high seismic velocities. These constraints suggest that diamond and eclogite are the most likely high-Vs candidates to explain the observed velocities, but matching the high shear-wave velocities requires either a large proportion of eclogite (>50 vol.%) or the presence of up to 3 vol.% diamond, with the exact values depending on peridotite and eclogite compositions and the geotherm. Both of these estimates are higher than predicted by observations made on natural samples from kimberlites. However, a combination of =20 vol.% eclogite and ~2 vol.% diamond may account for high shear-wave velocities, in proportions consistent with multiple geophysical observables, data from natural samples, and within mass balance constraints for global carbon. Our results further show that cratonic thermal structure need not be significantly cooler than determined from xenolith thermobarometry.
DS201807-1491
2018
Zeng, Li.Garber, J.M., Maurya, S., Hernandez, J-A., Duncan, M.S., Zeng, Li., Zhang, H.L., Faul, U., McCammon, C., Montagner, J-P., Moresi, L., Romanowicz, B.A., Rudnick, R.L., Stixrude, L.Multidisciplinary constraints on the abundance of diamond and eclogite in the cratonic lithosphere. Mentions Jericho and Roberts VictorGeochemistry, Geophysics, Geosystems, https://doi.org/10.1029/2018GCC007534Globalthermobarometry

Abstract: Some seismic models derived from tomographic studies indicate elevated shear-wave velocities (=4.7 km/s) around 120-150 km depth in cratonic lithospheric mantle. These velocities are higher than those of cratonic peridotites, even assuming a cold cratonic geotherm (i.e., 35 mW/m2 surface heat flux) and accounting for compositional heterogeneity in cratonic peridotite xenoliths and the effects of anelasticity. We reviewed various geophysical and petrologic constraints on the nature of cratonic roots (seismic velocities, lithology/mineralogy, electrical conductivity, and gravity) and explored a range of permissible rock and mineral assemblages that can explain the high seismic velocities. These constraints suggest that diamond and eclogite are the most likely high-Vs candidates to explain the observed velocities, but matching the high shear-wave velocities requires either a large proportion of eclogite (>50 vol.%) or the presence of up to 3 vol.% diamond, with the exact values depending on peridotite and eclogite compositions and the geotherm. Both of these estimates are higher than predicted by observations made on natural samples from kimberlites. However, a combination of =20 vol.% eclogite and ~2 vol.% diamond may account for high shear-wave velocities, in proportions consistent with multiple geophysical observables, data from natural samples, and within mass balance constraints for global carbon. Our results further show that cratonic thermal structure need not be significantly cooler than determined from xenolith thermobarometry.
DS200912-0446
2009
Zeng, Q.Liu, Q., Yang, T., Zeng, Q., Zheng, J., Luo, Y., Qui, N., Xu, H., Jin, Z.Magnetic study of the UHP eclogites from the Chinese Continental Scientific drilling project.Journal of Geophysical Research, Vol. 114, B02106.ChinaUHP
DS201012-0454
2010
Zeng, Q.Liu, Q., Zeng, Q., Zheng, J., Yang, T., Qui, N., Liu, Z., Lou, Y., Jin, Z.Magnetic properties of serpentinized garnet peridotites from the CCSD main hole in the Sulu ultrahigh pressure metamorphic belt, eastern China.Journal of Geophysical Research, Vol. 115, B6, B06104ChinaUHP
DS201412-1024
2014
Zeng, Q-S.Zhang, L., Meng, Y., Yang, W.,Wang, L., Mao, W.L., Zeng, Q-S., Jeong, J.S., Wagner, A.J., Mkhoyan, K.A., Liu, W., Xu, R., Mao, H-K.Disproportionation of (Mg,Fe) SiO3 perovskite in Earth's deep lower mantle.Science, Vol. 344, no. 6186, pp. 877-882.MantlePerovskite
DS1995-2126
1995
Zeng, R.Zeng, R., et al.A review of lithospheric structures in the Tibetan Plateau and constraints on dynamics.Pure and Applied Geophysics, Vol. 145, No. 3-4, Dec. 1, pp. 425-444.China, MongoliaGeodynamics, Mantle
DS2003-1369
2003
Zeng, R.Teng, J., Zeng, R., Yan, Y.Depth distribution of Moho and tectonic framework in eastern Asian continent and itsScience in China Series d Earth Sciences, Vol. 46, 5, pp. 428-46.Asia, ChinaTectonics
DS200412-1978
2003
Zeng, R.Teng, J., Zeng, R., Yan, Y.Depth distribution of Moho and tectonic framework in eastern Asian continent and its adjacent ocean areas.Science China Earth Sciences, Vol. 46, 5, pp. 428-46.Asia, ChinaTectonics
DS200812-1290
2008
Zeng, X.Yang, F., Liu, B., Ni, S., Zeng, X., Dai, Z., Li, Y.Lowermost mantle shear velocity anisotropy beneath Siberia.Acta Seismologica Sinica, Vol. 21, 3, pp. 213-216.RussiaGeophysics - seismics
DS201312-0992
2013
Zeng, X-q.Yang, Z-j., Liang, R., Zeng, X-q., Ge, T-y., Al Qun, Zhenh, Y-l., Peng, M-s.Study on the micro-infrared spectra and origin of polycrystalline diamonds from Mengyin kimberlite pipes.Spectroscopy and Spectral Analysis, Vol. 32, 8, pp. 1512-1518.ChinaDeposit - Mengyin
DS201312-1008
2013
Zeng, X-Q.Zeng, X-Q., Zheng, Y-L., Yang, Z-J., Ai, Hu, Q.Study on the micro-FTIR and raman spectra of the alluvial diamonds from Yangtze craton and their geological significance.Spectroscopy and Spectral Analysis, Vol. 33, no. 10.pp. 2694-2699.ChinaAlluvials
DS201511-1826
2015
Zeng, Y.Boyd, O.S., Smalley, R., Zeng, Y.Crustal deformation in the New Madrid seismic zone and the role of postseismic processes.Journal of Geophysical Research, Vol. 120, 8, pp. 5782-5803.United States, ArkansasGeophysics - seismics

Abstract: Global Navigation Satellite System data across the New Madrid seismic zone (NMSZ) in the central United States over the period from 2000 through 2014 are analyzed and modeled with several deformation mechanisms including the following: (1) creep on subsurface dislocations, (2) postseismic frictional afterslip and viscoelastic relaxation from the 1811–1812 and 1450 earthquakes in the NMSZ, and (3) regional strain. In agreement with previous studies, a dislocation creeping at about 4 mm/yr between 12 and 20 km depth along the downdip extension of the Reelfoot fault reproduces the observations well. We find that a dynamic model of postseismic frictional afterslip from the 1450 and February 1812 Reelfoot fault events can explain this creep. Kinematic and dynamic models involving the Cottonwood Grove fault provide minimal predictive power. This is likely due to the smaller size of the December 1811 event on the Cottonwood Grove fault and a distribution of stations better suited to constrain localized strain across the Reelfoot fault. Regional compressive strain across the NMSZ is found to be less than 3?×?10-9/yr. If much of the present-day surface deformation results from afterslip, it is likely that many of the earthquakes we see today in the NMSZ are aftershocks from the 1811–1812 New Madrid earthquakes. Despite this conclusion, our results are consistent with observations and models of intraplate earthquake clustering. Given this and the recent paleoseismic history of the region, we suggest that seismic hazard is likely to remain significant.
DS201906-1364
2019
Zeng, Z.Zeng, Z., Li, X., Liu, Y., Huang, F., Yu, H-M.High precision barium isotope measurements of carbonates by MC-ICP-MS.Geostandards and Geoanalytical Research, Vol. 43, 2, pp. 291-300.Globalcarbonatites

Abstract: This study presents a high-precision method to measure barium (Ba) isotope compositions of international carbonate reference materials and natural carbonates. Barium was purified using chromatographic columns filled with cation exchange resin (AG50W-X12, 200-400 mesh). Barium isotopes were measured by MC-ICP-MS, using a 135Ba-136Ba double-spike to correct mass-dependent fractionation during purification and instrumental measurement. The precision and accuracy were monitored by measuring Ba isotope compositions of the reference material JCp-1 (coral) and a synthetic solution obtained by mixing NIST SRM 3104a with other matrix elements. The mean d137/134Ba values of JCp-1 and the synthetic solution relative to NIST SRM 3104a were 0.21 ± 0.03‰ (2s, n = 16) and 0.02 ± 0.03‰ (2s, n = 6), respectively. Replicate measurements of NIST SRM 915b, COQ-1, natural coral and stalagmite samples gave average d137/134Ba values of 0.10 ± 0.04‰ (2s, n = 18), 0.08 ± 0.04‰ (2s, n = 20), 0.27 ± 0.04‰ (2s, n = 16) and 0.04 ± 0.03‰ (2s, n = 20), respectively. Barium mass fractions and Ba isotopes of subsamples drilled from one stalagmite profile were also measured. Although Ba mass fractions varied significantly along the profile, Ba isotope signatures were homogeneous, indicating that Ba isotope compositions of stalagmites could be a potential tool (in addition to Ba mass fractions) to constrain the source of Ba in carbonate rocks and minerals.
DS201312-0989
2013
Zeng, Z-j.Yang, A.Q., Zeng, Z-j., Zheng, X-q., Hu, Y-l.Emplacement age and Sr-Nd isotopic compositions of the AfrikAnd a alkaline ultramafic complex, Kola Peninsula, Russia.Spectroscopy and Spectral Analysis, Vol. 33, 9, pp. 2374-2378.ChinaDeposit - Mengyin
DS1990-1622
1990
Zeng RongshuZeng Rongshu, Mackenzie, W.S.Variation of the primary field of leucite under water deficient conditions in the system northeast-Ks-Q-H2O at PH2O =kbInternational Mineralogical Association Meeting Held June, 1990 Beijing China, Vol. 1, extended abstract p. 129-130ChinaExperimental petrology, Leucite
DS1982-0197
1982
Zengdu, QI.Evans, T., Zengdu, QI.Aggregation of Nitrogen in DiamondProceedings high pressure AND RESEARCH INDUSTRY 8TH. AIRAPT Conference, Vol. 2, PP. 694-696.GlobalResearch
DS1982-0196
1982
Zengdu qi.Evans, T., Zengdu qi.The Kinetics of the Aggregation of Nitrogen Atoms in DiamondProceedings of the Royal SOC. LONDON., Vol. A381, PP. 159-178.GlobalDiamond, Natural, Morphology, Research, Inclusions
DS201012-0245
2010
Zengeni, T.G.Gore, J., James, D.E., Zengeni, T.G., Gwavava, O.Crustal structure of the Zimbabwe craton and the Limpopo belt of southern Africa: new constraints from seismic dat a and implications for its evolution.South African Journal of Geology, Vol. 112, pp. 213-228.Africa, Zimbabwe, South Africa, BotswanaGeophysics - seismics
DS200412-0470
2003
Zenglein, R.Doorgapershad, A., Barnett, M., Twiggs, C., Martin, J., Millonig, L., Zenglein, R.Procedures used to produce a digitized geological mapping database of the area around the Venetia kimberlite pipes, Limpopo BeltSouth African Journal of Geology, Vol. 106, 2-3, pp. 103-108.Africa, South AfricaDeposit - Venetia, mapping
DS200412-1817
2003
Zengqian, H.Shuyin, N., Quanlin, H., Zengqian, H., Aiqun, S., Baode, W., Hongyang, L., Chuanshi, X.Cascaded evolution of mantle plumes and metallogenesis of core and mantle derived elements.Acta Geologica Sinica, Vol. 77, 4, pp. 522-536.MantleMetallogeny
DS200712-1222
2006
Zengqian, H.Zengqian, H., Lu, Jiren, Lin, ShengzhingHeterogeneity of a plume axis: bulk rock geochemical evidence from picrites and basalts in the Emei large Igneous Province, southwest China.International Geology Review, Vol. 48, 12, pp. 1087-1112.ChinaPicrite
DS2001-1074
2001
Zengqui, Z.Shutian, S., Zengqui, Z., Zhendong, ZemingPost collisional ductile extensional tectonic framework in the ultra high pressure (UHP) and HP metamorphic belts in Dabie Sulu areaActa Geol. Sinica, Vol. 75, No. 2, pp. 151-60.Chinaultra high pressure (UHP), Tectonics
DS1998-1489
1998
Zenteno Yelpi, L.Tulcanaza Navarro, E., Zenteno Yelpi, L.Options for hedging.. mine planning scenarios to meet contingencies.PartII.see July Scanning p.278Engineering and Mining Journal, Vol. 199, No. 6, June pp. 36-8GlobalEconomics, mining, reserves, cost/price, Discoveries
DS1992-1732
1992
Zentille, M.Zentille, M., Reynolds, P.H.Low temperature thermochronologyMineralogical Association of Canada short course Handbook, 225p. approx. $ 30.00GlobalGeochronology, thermochronology, case studies, Table of contents
DS1998-0048
1998
Zentilli, M.Arne, D.C., Zentilli, M., Grist, A.M., Collins, M.Constraints on the timing of thrusting during the Eurekan Orogeny, Canadian Arctic Archipelago...Canadian Journal of Earth Sciences, Vol. 35, No. 1, Jan. pp. 30-38.Northwest Territories, Ellesmere Island, Sverdrup BasinGeochronology, geothermometry, Tectonics - thrust fault movements
DS201612-2309
2016
Zepeda-Alarcon, E.Kaercher, P., Miyagi, L., Kanitpanyacharoen, W., Zepeda-Alarcon, E., Wang, Y., Parkinson, D., Lebensohn, R.A., De Carlo, F., Wenk, H.R.Two phase deformation of lower mantle mineral analogs.Earth and Planetary Science Letters, Vol. 456, pp. 134-145.MantleBridgemanite

Abstract: The lower mantle is estimated to be composed of mostly bridgmanite and a smaller percentage of ferropericlase, yet very little information exists for two-phase deformation of these minerals. To better understand the rheology and active deformation mechanisms of these lower mantle minerals, especially dislocation slip and the development of crystallographic preferred orientation (CPO), we deformed mineral analogs neighborite (NaMgF3, iso-structural with bridgmanite) and halite (NaCl, iso-structural with ferropericlase) together in the deformation-DIA at the Advanced Photon Source up to 51% axial shortening. Development of CPO was recorded in situ with X-ray diffraction, and information on microstructural evolution was collected using X-ray microtomography. Results show that when present in as little as 15% volume, the weak phase (NaCl) controls the deformation. Compared to single phase NaMgF3 samples, samples with just 15% volume NaCl show a reduction of CPO in NaMgF3 and weakening of the aggregate. Microtomography shows both NaMgF3 and NaCl form highly interconnected networks of grains. Polycrystal plasticity simulations were carried out to gain insight into slip activity, CPO evolution, and strain and stress partitioning between phases for different synthetic two-phase microstructures. The results suggest that ferropericlase may control deformation in the lower mantle and reduce CPO in bridgmanite, which implies a less viscous lower mantle and helps to explain why the lower mantle is fairly isotropic.
DS1997-1295
1997
Zerb, W.Zerb, W.The Alberta diamond playPacific International Securities, 8p.AlbertaNews item - promotion
DS1993-1809
1993
Zerr, A.Zerr, A., Boehler, R.Melting of (MgFe)SiO2 perovskite to 625 kilobars: indication of a high melting temperature in the lower mantle.Science, Vol. 262, No. 5133, October 22, pp. 553-554.MantleMelting, Perovskite
DS1998-0135
1998
Zerr, A.Boehler, R., Zerr, A., Serghiou, Tschauner, HilgrenNew experimental constraints on the nature of DMineralogical Magazine, Goldschmidt abstract, Vol. 62A, p. 182-3.MantleCore mantle boundary layer, Perovskite
DS1859-0106
1851
Zerrenner, C.Zerrenner, C.Anleitung Zum Gold-,platin-,und Diamant-waschen Aus Seifengebirge .....Leipzig: Engelman., 28P.Europe, GermanyDiamond Occurrence
DS1990-0936
1990
Zervas, C.Lin, J., Purdy, G.M., Schouten, H., Semopere, J.C., Zervas, C.Evidence from gravity dat a for focused magmatic accretion along the mid-Atlantic RidgeNature, Vol. 344, No. 6267, April 12, pp. 627-632Mid-Atlantic RidgeGeophysics -gravity, Magma
DS1989-1679
1989
Zerzan, J.M.Zerzan, J.M.OVERLAP: a FORTRAN program for rapidly evaluating the area of overlap between two polygonsComputers and Geosciences, Vol. 15, No. 7, pp. 1109-1114GlobalComputer, Program -OVERLAP
DS200612-1121
2006
Zetgenizov, D.A.Ragozin, A.L., Shatsky, V.S., Zetgenizov, D.A., Mityukhin, S.I.Evidence for evolution of diamond crystallization medium in eclogite xenolith from the Udachnaya kimberlite pipe, Yakutia.Doklady Earth Sciences, Vol. 407A, 3, pp. 465-468.Russia, YakutiaDiamond morphology - Udachnaya
DS2002-0901
2002
Zetsche, F.Kruger, F., Scherbaum, F., Rosa, J.W.C., Kind, R., Zetsche, F., Hohne, J.Crustal and upper mantle structure in the Amazon region ( Brasil) determined with broadband mobile stations.Journal of Geophysical Research, Oct. 29, 10.1029/2001JB000598.BrazilGeophysics - seismics, Tectonics
DS2002-0902
2002
Zetsche, F.Kruger, F., Scherbaum, F., Rosa, J.W.C., Kind, R., Zetsche, F., Hohne, J.Crustal and upper mantle structure in the Amazon region ( Brazil) determined with broadband mobile stations.Journal of Geophysical Research, Vol. 107, 10, ETE 17 DOI 10.1029/2001JB000598BrazilGeophysics - seismics, Tectonics
DS201412-0614
2014
Zeug, M.Nasdala, L., Kostrovitsky, S., Kennedy, A.K., Zeug, M., Esenkulova, S.A.Retention of radiation damage in zircon xenocrysts from kimberlites, northern Yakutia.Lithos, Vol. 206-207, pp. 252-261.Russia, YakutiaKuoika, Ary-Mastakh fields
DS201412-0957
2014
Zevenbergen, M.Waal, A., Orij, Rosman, R., Jantien, Zevenbergen, M.Applicabaility of the high performance organization framework in the diamond industry value chain.Journal of Strategy and Management , Vol. 7, 1, pp. 30-48.GlobalDiamond financial - economics
DS1990-0779
1990
Zevenhuizen, J.Josenhans, H.W., Zevenhuizen, J.Dynamics of the Laurentide ice sheet in Hudson Bay, CanadaMarine Geology, Vol. 92, No. 1-2, pp. 1-26OntarioGeomorphology, Laurentide Ice Sheet
DS1996-1342
1996
Zeyen, H.Sobolev, S.V., Zeyen, H., et al.Upper mantle temperatures from teleseismic tomography of French massif central - composition, reactions, meltEarth and Planetary Science Letters, Vol. 140, pp. 147-163GlobalMantle tomography, Geophysics -seismics
DS1997-1296
1997
Zeyen, H.Zeyen, H., Volker, F., Altherr, R.Styles of continental rifting: crust mantle detachment and mantle plumesTectonophysics, Vol. 278, No. 1-4, Sept. 15, pp. 329-AfricaTectonics, Rifting, mantle
DS200512-1077
2005
Zeyen, H.Teixell, A., Ayarza, F., Zeyen, H., Fernandez, M., Arboleya, M-L.Effects of mantle upwelling in a compressional setting: the Atlas Mountains of Morocco.Terra Nova, Vol. 17, 5. pp. 456-461.Africa, MoroccoPlume
DS201412-0488
2014
Zeyen, H.Kumar, N., Zeyen, H., Singh, A.P.3D lithosphere density structure of Southern Indian shield from joint inversion of gravity, geoid and topography data.Journal of Asian Earth Sciences, Vol. 89, pp. 98-107.IndiaGeophysics - seismics
DS201511-1880
2015
Zeyen, H.Singh, A.P., Kumar, N., Zeyen, H.Three dimensional lithospheric mapping of the eastern Indian Shield: a multi-parametric inversion approach.Tectonophysics, Vol. 665, pp. 164-176.IndiaGeophysics - seismics

Abstract: We analyzed satellite gravity and geoid anomaly and topography data to determine the 3D lithospheric density structure of the Singhbhum Protocontinent. Our density model shows that distinct vertical density heterogeneities exist throughout the lithosphere beneath the Singhbhum Protocontinent. The crustal structure identified includes a lateral average crustal density variation from 2800 to 2890 kg/m3 as well as a relatively flat Moho at 35-40 km depth in Singhbhum Protocontinent and Bastar Craton. A similar Moho depth range is found for the Mahanadi, Damodar, and Bengal basins. In the northern part of the area, Moho undulates between more than 40 km under the confluence of Mahanadi-Damodar Gondwana basins and the Ganga foreland basin, and 36-32 km under the Eastern Ghats Mobile belt and finally reaches 24 km in the Bay of Bengal. The lithosphere-asthenosphere boundary (LAB) across the Singhbhum Protocontinent is at a depth of about 130-140 km. In the regions of Bastar Craton and Bengal Basin, the LAB dips to about 155 ± 5 km depth. The confluence of Mahanadi and Damodar Gondwana basins toward the north-west and the foreland Ganga Basin toward the north are characterized by a deeper LAB lying at a depth of over 170 and 200 km, respectively. In the Bay of Bengal, the LAB is at a shallower depth of about 100-130 km except over the 85 0E ridge (150 km), and off the Kolkata coast (155 km). Significant density variation as well as an almost flat crust-mantle boundary indicates the effect of significant crustal reworking. The thin (135-140 km) lithosphere provides compelling evidence of lithospheric modification in the Singhbhum Protocontinent. Similarities between the lithospheric structures of the Singhbhum Craton, Chhotanagpur Gneiss Complex, and Northern Singhbhum Mobile Belt confirm that the repeated thermal perturbation controlled continental lithospheric modification in the Singhbhum Protocontinent.
DS202008-1461
2020
Zeyen, N.Zeyen, N., Wang, B., Wilson, S.A., von Gunten, K., Alessi, D.S., Paulo, C., Stubbs, A.R., Power, I.M.Cation exchange: a new strategy for mineral carbonation of smectite-rich kimberlites.Goldschmidt 2020, 1p. AbstractAfrica, South Africadeposit - Venetia

Abstract: Mineral carbonation is a form of carbon capture, utilization and storage (CCUS) that aims to transform excess CO2 into environmentally benign carbonate minerals which are geologically stable. Here, we investigated the reactivity of processed kimberlite and kimberlite ore from the Venetia Diamond Mine (South Africa). Highly reactive phases, such as brucite [Mg(OH)2], are uncommon in the samples collected from Venetia necessitating the development of new strategies for mineral carbonation. Kimberlite ore and tailings from this mine consist of a clay-rich mineral assemblage that is dominated by lizardite (a serpentine mineral) and smectites. Smectites are swelling clays that can act as a source of Mg and Ca for carbonation reactions via cation exchange, dissolution and/or direct replacement of smectites to form carbonate phases. Although carbonation of serpentine and brucite has long been a focus of CCUS in mine wastes [1], smectite carbonation has not been explored in this setting. Quantitative X-ray diffraction using Rietveld refinements coupled with Fourier-transform infrared spectroscopy indicate that smectites of stevensite-saponite composition are abundant in the Venetia samples (1.3-15.4 wt.%). Synchrotron-based X-ray fluorescence mapping correlated with scanning and transmission electron microscopy show that smectites are distributed as altered, smooth regions measuring from 1 to 20 µm in breadth. These phases are rich in Mg and Ca and Al-poor. To better understand the behaviour/reactivity of smectites during the cation exchange process, we have used batch experiments with pure endmembers of Ca-, Mg- and Na-montmorillonite under different treatment conditions (NH4-citrate, NH4-O-acetate, NH4-Cl and Na3-citrate). After 24 hours of reaction, ICP-MS analyses reveal that the four treatments have the same efficiency for Ca and Mg exchange, while NH4-Cl and NH4- O-acetate treatments minimize calcite dissolution. Our end goals are to optimize settling time and to maximize extraction of Ca and Mg for carbonation reactions during ore processing.
DS200812-1104
2008
Zezekalo, M.Spetsius, Z.V., Zezekalo, M., Yu, Tarskhix, O.Y.Pecularities of mineralogy and petrography of the upper Muna field kimberlites: application to the lithospheric mantle composition.Deep Seated Magmatism, its sources and plumes, Ed. Vladykin, N.V., 2008 pp. 137-146.Russia, SiberiaDeposit - Muna field
DS1990-0164
1990
Zezin, R.B.Bareanov, G.P., Zezin, R.B., Kuznetsova, V.P.Inclusions of 'diamond within diamond' type and pecularities of crystallography and morphology of a host diamond.(Russian)Izvest. Akad, Nauk SSSR, (Russian), Vol. 1990, No. 10, October, pp. 70-77RussiaDiamond morphology, Diamond inclusions
DS1990-0170
1990
Zezin, R.B.Barsanov, G.P., Zezin, R.B., Kuznetsova, V.P.Influence of diamond in diamond -type inclusions on crystallographical morphological pecularities of diamond host. (Russian)Izvest. Akad. Nauk SSSR, (Russian), No. 10, pp. 70-78RussiaDiamond inclusions, Diamond morphology
DS1990-0896
1990
Zezin, R.B.Kuznetsova, V.P., Maltsev, K.A., Gorbachev, V.V., Zezin, R.B.Isotopic composition of diamonds bearing inlclusions of diamonds.(Russian)Geochemistry International (Geokhimiya), (Russian), No. 7, July pp. 1033-1039RussiaDiamond inclusions, Diamonds
DS1990-1623
1990
Zezin, R.B.Zezin, R.B., Saparin, G.V., Smirnova, E.P., Obyden, S.K., ChukichevCathodluminescence of natural diamonds from Jakutian depositsScanning, Vol. 12, No.6, Nov-Dec. pp. 326-333RussiaDiamond morphology, Cathodluminescence
DS1991-0070
1991
Zezin, R.B.Barasanov, G.P., Zezin, R.B., Kuznetsova, V.P.Influence of diamond in diamond inclusions on the crystal morphology of the host diamondInternational Geology Review, Vol. 32, No. 10, October pp. 981-987RussiaDiamond morphology, Diamond inclusions
DS1992-1733
1992
Zezin, R.B.Zezin, R.B., Smirnova, E.P., Saparin, G.V., Obyden, S.K.New growth features of natural diamonds, revealed by colour cathodluminescence scanning electron microscope (CCL SEM) techniqueScanning, Vol. 14, No. 1, Jan-Feb. pp. 3-10.# HC 517GlobalNatural diamond morphology, Cathodluminescence
DS1983-0647
1983
Zezulka, J.Zezulka, J.Precious Stones of the United Republic of TanzaniaGeol. Pruzkum., No. 4, PP. 113-116.East Africa, TanzaniaGemstones, Diamond
DS1985-0763
1985
Zezulkova, I.Zezulkova, I.Petrology of dike rocks near Techlovice in the Ceske Stretdohori Bohemia.*CZE.Cas. Mineral. Geol. *CZE., Vol. 30, No. 3, pp. 303-313GlobalCamptonite
DS202005-0775
2020
Zgonnik, V.Zgonnik, V.The occurrence and geoscience of natural hydrogen: a comprehensive review.Earth Science Reviews, Vol. 203, 103140, 51p. PdfGlobalhydrogen

Abstract: Using an interdisciplinary approach, this paper reviews current knowledge in the field of natural hydrogen. For the first time, it combines perspectives on hydrogen from the literature of the former Eastern bloc with that of the West, including rare hardcopies and recent studies. Data are summarized and classified in three main sections: hydrogen as a free gas in different environments, as inclusions in various rock types, and as dissolved gas in ground water. This review conclusively demonstrates that molecular hydrogen is much more widespread in nature than was previously thought. Hydrogen has been detected at high concentrations, often as the major gas, in all types of geologic environment. A critical evaluation of all the proposed mechanisms regarding the origin of natural hydrogen shows that a deep-seated origin is potentially the most likely explanation for its abundance in nature. By combining available data, an estimate of 23 Tg/year for the total annual flow of hydrogen from geologic sources is proposed. This value is an order of magnitude greater than previous estimate but most likely still not large enough to account for recently discovered worldwide diffusive seepages. Hydrogen could play a critical role in mechanisms taking place in both the shallow and deep geospheres and it can influence a very wide range of natural phenomena. Hydrogen is an essential energy source for many microorganisms. Sampling for hydrogen can be a useful tool in studying natural environments, geologic mapping, monitoring of earthquakes, plotting fault traces and resource exploration. Hydrogen of geologic origin has the potential to become the renewable energy source of the future, with exploratory projects ongoing at the present time. The topic of natural hydrogen is therefore relevant from many different perspectives.
DS200512-0306
2005
Zha, X.Fu, R., Wang, J., Chang, X., Huang, J., Dai, Z., Zha, X.Upper mantle convection driving by density anomaly and a test model.Acta Seismologica Sinica, Vol. 18, 1, pp. 27-33.MantleGeophysics - seismics
DS201607-1306
2016
Zha, X-P.Li, W-Y., Teng, F-Z., Xiao, Y., Gu, H-O., Zha, X-P.Empirical calibration of the clinopyroene-garnet magnesium isotope geothermometer and implications. DabieContributions to Mineralogy and Petrology, Vol. 171, 7, 14p.ChinaGeothermometry

Abstract: The large equilibrium Mg isotope fractionation between clinopyroxene and garnet observed in eclogites makes it a potential high-precision geothermometer, but calibration of this thermometer by natural samples is still limited. Here, we report Mg isotopic compositions of eclogite whole rocks as well as Mg and O isotopic compositions of clinopyroxene and garnet separates from 16 eclogites that formed at different temperatures from the Dabie orogen, China. The whole-rock d26Mg values vary from -1.20 to +0.10 ‰. Among them, 11 samples display limited d26Mg variations from -0.36 to -0.17 ‰, similar to those of their protoliths. The mineral separates exhibit very different d26Mg values, from -0.39 to +0.39 ‰ for clinopyroxenes and from -1.94 to -0.81 ‰ for garnets. The clinopyroxene -garnet Mg isotope fractionation (?26Mgclinopyroxene -garnet = d26Mgclinopyroxene -d26Mggarnet) varies from 1.05 to 2.15 ‰. The clinopyroxene -garnet O isotope fractionation (?18Oclinopyroxene -garnet = d18Oclinopyroxene -d18Ogarnet) varies from -1.01 to +0.98 ‰. Equilibrium Mg isotope fractionation between clinopyroxene and garnet in the investigated samples is selected based on both the d26Mgclinopyroxene versus d26Mggarnet plot and the state of O isotope equilibrium between clinopyroxene and garnet. The equilibrium ?26Mgclinopyroxene -garnet and corresponding temperature data obtained in this study, together with those available so far in literatures for natural eclogites, are used to calibrate the clinopyroxene -garnet Mg isotope thermometer. This yields a function of ?26Mgclinopyroxene -garnet = (0.99 ± 0.06) × 106/T 2, where T is temperature in Kelvin. The refined function not only provides the best empirically calibrated clinopyroxene -garnet Mg isotope thermometer for precise constraints of temperatures of clinopyroxene- and garnet-bearing rocks, but also has potential applications in high-temperature Mg isotope geochemistry.
DS1960-0900
1967
Zhabin, A.G.Zhabin, A.G.Carbonatite-kimberlite from Arbarastakh Yakutia SssrDoklady Academy of Sciences Nauk SSSR., Vol. 177, PP. 167-170.RussiaBlank
DS1970-0217
1970
Zhabin, A.G.Zhabin, A.G., Surina, N.P.Petrology of Dikes, Sills and DiatremesMoscow: Nauka., RussiaKimberlite, Kimberley, Janlib
DS1992-1734
1992
Zhabin, A.G.Zhabin, A.G., Gladkikh, V.C.The equilibrium structures of mineral aggregates in deep seated lherzolitenodulesDoklady Academy of Science USSR, Earth Science Section, Vol. 313, No. 106, June pp. 204-207RussiaLherzolite
DS1995-2127
1995
Zhabin, A.G.Zhabin, A.G.Structure of a fourth generation prospecting model of an ore depositDoklady Academy of Sciences, Vol. 330, No. 4, May pp. 125-129RussiaOre modeling
DS2000-0062
2000
ZhaiBarry, T.L., Kampunzu, Rasskazov, Ivanov, Zhaivolcanism and rifting: contrast between East African and Central East Asian rifts.Igc 30th. Brasil, Aug. abstract only 1p.East Africa, AsiaTectonics - rifting
DS200712-0802
2007
Zhai, F.Park, C-Y., Zhai, F.Asia's imprint on global commodity markets.Minerals & Energy - Raw Materials Report, Vol. 22, 1-2, pp. 18-47.AsiaEconomics - markets
DS1996-0855
1996
Zhai, L.Liu, G., Zhai, L., Qing, M., Wang. X., Che, F.Magma melt inclusions in diamondsInternational Geological Congress 30th Session Beijing, Abstracts, Vol. 2, p. 397.ChinaDiamond inclusions, Deposit -Fuxian, Mengyin, Dingiagang
DS1995-0344
1995
Zhai, M.Cong, B., Zhai, M., Carswell, D.A., Wilson, R.N., et al.Petrogenesis of ultrahigh pressure rocks and their country rocks at Shuanghe in Dabie Shan central China.Eur. Journal of Mineralogy, No. 1, pp. 119-138.ChinaPetrology, Dabie Shan
DS1996-0247
1996
Zhai, M.Carswell, D.A., Wilson, R.N., Zhai, M.Ultra high pressure aluminous titanites in carbonate bearing eclogites at Shuanghe in Dabie Shan, China.Mineralogical Magazine, Vol. 60, pp. 461-71.ChinaEclogites, Deposit -Shuanghe, Dabie Shan
DS1997-0169
1997
Zhai, M.Carswell, D.A., O'Brien, P.J., Zhai, M.Thermobarometry of phengite bearing eclogites in the Dabie Mountains of central China.Journal of Met. Geology, Vol. 15, No. 2, Mar. 1, pp. 239-252.ChinaEclogites, Dabie Mountains
DS1997-0572
1997
Zhai, M.Kato, T., Enami, M., Zhai, M.Ultra high pressure (ultra high pressure (UHP)) marble and eclogite in the SuLu ultra high pressure (UHP) terrane eastern China.Journal of Met. Geology, Vol. 15, No. 2, Mar. 1, pp. 169-182.ChinaEclogites
DS2002-0621
2002
Zhai, M.Guan, H., Sun, M., Wilde, S.A., Zhou, X., Zhai, M.SHRIMP Uranium-Lead- zircon geochronology of the Fuping Complex: implications for formation and assembly Craton.Precambrian Research, Vol. 113, No. 1-2, Jan. pp. 1-18.ChinaCraton - North China, Geochronology
DS2002-1789
2002
Zhai, M.Zhao, T.P., Zhou, M.F., Zhai, M., Xia, B.Paleoproterozoic rift related volcanism of the Xiong'er group, north Chin a Craton: implications for the breakup of Columbia.International Geology Review, Vol. 44, 4, pp. 336-51.ChinaTectonics - rifting
DS2003-0244
2003
Zhai, M.Chen, B., Zhai, M.Geochemistry of late Mesozoic lamprophyre dykes from the Taihang Mountains, northGeological Magazine, Vol. 140, 1, pp. 87-93.ChinaLamprophyres
DS2003-0687
2003
Zhai, M.Kampunzu, A.B., Tombale, A.R., Zhai, M., Bagai, Z., Majaule, T., Modisi, M.P.Major and trace element geochemistry of plutonic rocks from Francistown, NELithos, Vol. 71, 2-4, pp. 431-460.ZimbabweTectonics
DS2003-1542
2003
Zhai, M.Zhai, M., Guo, J., Li, Y., Peng, P., Shi, X.Two linear granite belts in the central western North Chin a Craton and their implicationPrecambrian Research, Vol. 127, 1-2, Nov. pp.267-283.ChinaTectonics
DS2003-1543
2003
Zhai, M.Zhai, M., Liu, W.Paleoproterozoic tectonic history of the North Chin a craton: a reviewPrecambrian Research, Vol. 122, 1-4, pp.183-199.ChinaTectonics
DS200412-0949
2003
Zhai, M.Kampunzu, A.B., Tombale, A.R., Zhai, M., Bagai, Z., Majaule, T., Modisi, M.P.Major and trace element geochemistry of plutonic rocks from Francistown, NE Botswana: evidence for a Neoarchean continental actiLithos, Vol. 71, 2-4, pp. 431-460.Africa, ZimbabweTectonics
DS200412-1432
2004
Zhai, M.Ni, Z., Zhai, M., Wang, R., Tong, Y., Shu, G., Hai, X.Discovery of Late Paleozoic retrograded eclogites from the middle part of the northern margin of North Chin a Craton.Chinese Science Bulletin, Vol. 49, 6, pp. 600-606. Ingenta 1042070211ChinaEclogite
DS200412-2200
2003
Zhai, M.Zhai, M., Guo, J., Li, Y., Peng, P., Shi, X.Two linear granite belts in the central western North Chin a Craton and their implication for Late Neoarchean Paleoproterozoic coPrecambrian Research, Vol. 127, 1-2, Nov. pp.267-283.ChinaTectonics
DS200412-2201
2003
Zhai, M.Zhai, M., Liu, W.Paleoproterozoic tectonic history of the North Chin a craton: a review.Precambrian Research, Vol. 122, 1-4, pp.183-199.ChinaTectonics
DS200512-0836
2005
Zhai, M.Peng, P., Zhai, M., Zhang, H., Guo, J.Geochronological constraints on the Paleoproterozoic evolution of the North Chin a Craton: SHRIMP zircon ages of different types of mafic dikes.International Geology Review, Vol. 47, 5, May, pp. 492-508.ChinaGeochronology
DS200512-1235
2004
Zhai, M.Zhai, M.Precambrian tectonic evolution of the North Chin a craton.Geological Society of London Special Paper, No. 226, pp. 57-62.ChinaTectonics
DS200512-1236
2005
Zhai, M.Zhai, M., Guo, J., Liu, W.Neoarchean to Paleoproterozoic continental evolution and tectonic history of the North Chin a Craton: a review.Journal of Asian Earth Sciences, Vol. 24, 5, pp. 547-561.ChinaTectonics
DS200512-1237
2004
Zhai, M.Zhai, M., Meng, Q., Liu, J.Geological features of Mesozoic tectonic regime inversion in eastern North Chin a and implication for geodynamics.Earth Science Frontiers, Vol. 11, 4, pp. 285-298. Ingenta 1045384779ChinaTectonics
DS200612-1586
2006
Zhai, M.Zhai, M., Kampunzu, A.B., Modisi, M.P., Bagai, Z.Sr and Nd isotope systematics of Francistown plutonic rocks, Botswana: implications for Neoarchean crustal evolution of the Zimbabwe craton.International Journal of Earth Sciences, Vol. 95. 3. pp. 355-369.Africa, Botswana, ZimbabweGeochronology
DS200612-1587
2006
Zhai, M.Zhai, M., Kampunzu, A.B., Modisi, M.P., Bagai, Z.Sr and Nd isotope systematics of Francistown plutonic rocks, Botswana: implications for Neoarchean crustal evolution of the Zimbabwe craton.International Journal of Earth Sciences, Vol. 95, 3, June pp. 355-369.Africa, Botswana, ZimbabweGeochronology - craton
DS200612-1588
2005
Zhai, M.Zhai, M., Liu, W.Tectonic division of the Sulu ultrahigh pressure region and the nature of its boundary with the North Chin a block.International Geology Review, Vol. 47, 11, pp. 1074-1089.Asia, ChinaTectonics
DS200712-1223
2007
Zhai, M.Zhai, M., et al.Linking the Sulu UHP belt to the Korean Peninsula: evidence from eclogite, Precambrian basement and Paleozoic basin.Gondwana Research, Vol. 12, 4, pp. 388-403.ChinaUHP
DS200812-0879
2008
Zhai, M.Peng, P., Zhai, M., Ernst, R.E., Guo, J., Liu, F., Hu, B.A 1.78 Ga large igneous province in the North Chin a Craton: the Xionger volcanic province and the North Chin a dyke swarm.Lithos, Vol. 101, 3-4, pp. 260-280.ChinaGeochemistry
DS201312-1014
2013
Zhai, M.Zhao, G.,Zhai, M.Lithotectonic elements of Precambrian basement in the North Chin a craton: review and tectonic implications.Gondwana Research, Vol. 23, 4, pp. 1207-1240.ChinaGeochronology
DS202004-0546
2020
Zhai, M.Xiang, L., Zheng, J., Zhai, M., Siebel, W.Geochemical and Sr-Nd-Pb isotopic constraints on the origin and petrogenesis of Paleozoic lamproites in the southern Yangtze Block, south China.Contributions to Mineralogy and Petrology, Vol. 175, 18p. PdfChinalamproites

Abstract: Lamproites and kimberlites are natural probes of the subcontinental lithospheric mantle providing insights into the Earth’s continental lithosphere. Whole-rock major-, trace-element and Sr-Nd-Pb isotopic compositions of the Paleozoic (~?253 Ma) lamproite dikes from the Baifen zone of the Zhenyuan area in southeastern Guizhou Province (in the southern Yangtze Block, South China) are presented. The Baifen lamproites are characterized by high MgO (7.84-14.1 wt%), K2O (3.94-5.07 wt%) and TiO2 (2.69-3.23 wt%) contents, low SiO2 (41.3-45.7 wt%), Na2O (0.21-0.28 wt%) and Al2O3 (6.10-7.20 wt%) contents. All lamproites have elevated Cr (452-599 ppm) and Ni (485-549 ppm) abundances, as well as high Ba (1884-3589 ppm), La (160-186 ppm), Sr (898-1152 ppm) and Zr (532-632 ppm) concentrations. They show uniform REE distribution patterns that are strongly enriched in light REEs relative to heavy REEs [(La/Yb)N?=?71.1-87.6], and exhibit OIB-like geochemical features with obvious enrichment of both LILEs and HFSEs in the primitive mantle-normalized multi-element distribution diagram. Moderately radiogenic Sr (87Sr/86Sri?=?0.706336-0.707439), unradiogenic Nd (143Nd/144Ndi?=?0.511687-0.511704 and eNd(t)?=??-?12.2 to?-?11.9), and low initial Pb (206Pb/204Pbi?=?16.80-16.90, 207Pb/204Pbi?=?15.34-15.35 and 208Pb/204Pbi?=?37.43-37.70) isotopic compositions are obtained from the rocks. They yield old model ages of TDM(Nd)?=?1.48-1.54 Ga. These signatures suggest that the Baifen lamproite magmas are alkaline, ultrapotassic and ultramafic in character and mainly represent mantle-derived primary melts, which have undergone insignificant crustal contamination and negligible fractional crystallization. The Baifen lamproites originated from a veined metasomatized lithospheric mantle source. We envisage that they were derived by partial melting of old, mineralogically complex metasomatic vein assemblages in the subcontinental lithospheric mantle beneath the southern Yangtze Block. The source region experienced ancient mantle metasomatism with complex modification by enriched fluids and melts. The metasomatic agents are most likely to originate from pre-existing slab subduction beneath the southeastern margin of the Yangtze Block. Tectonically, the Baifen lamproites were emplaced at the southern margin of the Yangtze Block, and they formed in an intraplate extensional setting, showing an anorogenic affinity. In terms of time and space, the genesis of Baifen lamproites is presumably related to the Emeishan large igneous province. The Emeishan mantle plume is suggested as an effective mechanism for rapid extension and thinning of the lithosphere, followed by decompression melting of the subcontinental lithospheric mantle. Combined with the thermal perturbation from asthenospheric upwelling induced by the Emeishan mantle plume, the lamproite magmas, representing small volume and limited partial melts of ancient enriched mantle lithosphere, arose. We propose that the generation of the Baifen lamproite dikes probably was a consequence of the far-field effects of the Emeishan mantle plume.
DS2001-1298
2001
Zhai, M.G.Zhai, M.G., Guo, J.H., Liu, W.J.An exposed cross section of early Precambrian continental lower crust in North Chin a Craton.Physics and Chemistry of the Earth, Vol. 26, pt. A. No. 9-10, pp. 781-92.ChinaMantle, Geology
DS2001-1299
2001
Zhai, M.G.Zhai, M.G., Guo, J.H., Liu, W.J.An exposed cross section of early Precambrian continental lower crust in North Chin a craton.Physics and Chemistry of the Earth Pt. A. Solid Earth, Vol. 26, No. 9-10, pp. 781-92.ChinaTectonics
DS2002-1775
2002
Zhai, M-G.Zhang, H.F., Sun, M., Zhou, X-H., Fan, W-M., Zhai, M-G.Mesozoic lithosphere destruction beneath the North Chin a Craton:Contribution to Mineralogy and Petrology, Vol. 143, 5, pp.ChinaTectonics - subduction
DS200712-0826
2007
Zhai, M-G.Peng, P., Zhai, M-G., Guo, J-H, Kusky, T.,Ping, T.Nature of mantle source contributions and crystal differentiation in the petrogenesis of the 1.78 Ga mafic dykes in the central North Chin a Craton.Gondwana Research, Vol. 12, 1-2, August pp. 29-46.ChinaDyke chemistry
DS200712-0827
2007
Zhai, M-G.Peng, P., Zhai, M-G., Guo, J-H, Kusky, T.,Ping, T.Nature of mantle source contributions and crystal differentiation in the petrogenesis of the 1.78 Ga mafic dykes in the central North Chin a Craton.Gondwana Research, Vol. 12, 1-2, August pp. 29-46.ChinaDyke chemistry
DS200812-1308
2007
Zhai, M-G.Zhai, M-G., Windley, B.F., Kusky, T.M., Meng, Q.R.Mesozoic sub-continental lithospheric thinning under eastern Asia.New books, Tables of contents and costsAsiaNorth China Craton
DS201112-1158
2011
Zhai, M-G.Zhai, M-G., Santosh, M.Tectonic models for the North Chin a craton. The early Precambrian odyssey of the North Chin a craton: a synoptic overview.Gondwana Research, Vol. 20, 1, pp. 6-25.ChinaTectonics
DS200812-1309
2008
Zhai, S.Zhai, S., Ito, E.Phase relations of CaAl4Si2O11 at high pressure and high temperature with implications for subducted continental crust into the deep mantle.Physics of the Earth and Planetary Interiors, Vol. 167, 161-167.MantleUHP
DS2003-1549
2003
Zhai, S.M.Zhang, R.Y., Zhai, S.M., Fei, Y.W.., Liou, J.G.Titanium solubility in coexisting garnet and clinopyroxene at very high pressure: theEarth and Planetary Science Letters, Vol. 216, 4, Dec. 10, pp. 591-601.GlobalBlank
DS200412-2210
2003
Zhai, S.M.Zhang, R.Y., Zhai, S.M., Fei, Y.W., Liou, J.G.Titanium solubility in coexisting garnet and clinopyroxene at very high pressure: the significance of exsolved rutile in garnet.Earth and Planetary Science Letters, Vol. 216, 4, Dec. 10, pp. 591-601.TechnologyUHP, solubility
DS1996-1587
1996
Zhai, X.Zhai, X., Coe, R.S., Gilder, S.A., Frost, G.M.Paleomagnetic constraints on the paleogeography of China: implications forGondwanaland.Australian Journal of Earth Sciences, Vol. 43, pp. 643-672.ChinaPaleomagnetism, Tectonics
DS1996-1588
1996
Zhai, Y.Zhai, Y., Deng, J.Outline of the mineral resources of Chin a and their tectonic settingAustralian Journal of Earth Sciences, Vol. 43, pp. 673-685ChinaTectonics, Metallogeny
DS1996-1589
1996
Zhai, Y.Zhai, Y., Deng, J.Outline of the mineral resources of Chin a and their tectonic settingAustralian Journal of Earth Sciences, Vol. 43, pp. 673-685.ChinaTectonics, Metallogeny
DS1992-1735
1992
Zhai, Y.J.Zhai, Y.J., Halls, H.C.Paleomagnetism of the Molson Dykes and Pikwitonei granulites, NorthernManitobaEos Transactions, Vol. 73, No. 14, April 7, supplement abstracts p. 92ManitobaPaleomagnetics, Dykes
DS200512-1238
2004
Zhamaletdinov, A.A.Zhamaletdinov, A.A., Shetsov, A.N., Tokarev, A.D.Normal model of electric conductivity of the Baltic Shield lithosphere and its geodynamic interpretation.Doklady Earth Sciences, Vol. 399, 8,pp. 1098-1102.Russia, Baltic ShieldGeophysics - seismics, tectonics
DS200912-0850
2009
Zhamaletdinov, A.A.Zhamaletdinov, A.A., Shevtsov, Kortkova et al.International FENICS experiment on the tensor frequency electromagnetic sounding of the lithosphere in the eastern Baltic ( Fennoscandian) Shield.Doklady Earth Sciences, Vol. 427, 2, pp. 979-984.Europe, Finland, NorwayGeophysics
DS201112-1159
2011
Zhamaletdinov, A.A.Zhamaletdinov, A.A.The new dat a on the structure of the continental crust based on results of electromagnetic sounding with the use of powerful controlled sources.Doklady Earth Sciences, Vol. 438, 2, pp. 798-802.MantleGeophysics - EM
DS1996-1590
1996
Zhan, M.Zhan, M., Li, B.The confirmation and study on Cenozoic kimberlites, Anyuan, southernChina.International Geological Congress 30th Session Beijing, Abstracts, Vol. 2, p. 396.ChinaKimberlites, Deposit -Anyuan
DS200612-1589
2006
Zhan, X.Zhan, X., Zhu, R., Liao, X.On thermal interaction between the Earth's core and mantle: an annular channel Model.Physics of the Earth and Planetary Interiors, Vol. 159, 1-2, pp. 96-108.MantleGeothermometry, core convection, geodynamics
DS1987-0830
1987
Zhanatauov, S.U.Zhanatauov, S.U.Stages of processing geochemical dat a coming from kimberlite ductsMathematical Methods in Geology, Abstracts, Mining Pribram, p. 6. (abstract.) Citation states English summaryRussiaGeochemistry
DS1992-0025
1992
ZhangAnderson, D.L., Tanimoto, T., Zhang, Yu-ShenPlate tectonics and hotspots: the third dimensionScience, Vol. 256, June 19, pp. 1645-1651MantleHot spots, Shear velocity
DS1994-1986
1994
ZhangZhang, Ru-Yuan, Liou, J.G.Coesite bearing eclogite in Henan Province, central China: detailedpetrography, glaucophane stability and PT path.European Journal of Mineralogy, Vol. 6, pp. 217-233.ChinaEclogite, Mineralogy, Coesite
DS1995-2130
1995
ZhangZhang, Peishan, et al.Occurrences of RE minerals and geology of rare earth elements (REE) ore depositsIn: Mineralogy and geology of rare earths in China, pp. 171-190ChinaRare earths, Carbonatite
DS2000-1043
2000
ZhangYongbei, Zhang, Zhao, C., Xu, C.The characteristics of apatitic carbonatite of Proterozoic Kunyang Rift, Yunnan China.Igc 30th. Brasil, Aug. abstract only 1p.ChinaCarbonatititic tuff
DS2000-1047
2000
ZhangZhang, Min, Suddaby, P., O'Reilly, S.Y., Norman, M., QiuNature of lithospheric mantle beneath the eastern part of Central Asian fold belt: mantle xenolith evidence.Tectonophysics, Vol. 328, no, 1-2 Dec.20, pp.131-56.GlobalXenoliths, Geochemistry
DS2001-0072
2001
ZhangBai, W. Yang, Robinson, Febg, Zhang, Yan, HuStudy of diamonds from chromitites in the Luobusa ophiolite, TibetActa Geologica Sinica, Vol. 75, No. 3, pp. 409-17.China, TibetChromitites - diamond
DS2001-0073
2001
ZhangBai, W., Yang, J., Fang, Yan, ZhangExplosion of ultrahigh pressure minerals in the mantleActa Geologica Sinica, Vol. 22, No. 5, pp. 385-90.MantleUHP
DS2001-0181
2001
ZhangChen, S., O'Reilly, S., Zhou, Griffin, Zhang, Sun, FengThermal and petrological structure of the lithosphere beneath Hannuoba, Sino Korean Craton, evidence xenolithLithos, Vol. 56, pp. 267-301.ChinaXenoliths, trace elements, structure
DS2001-0355
2001
ZhangGao, S., Kern, H., Jin, Popp, Jin, Zhang, ZhangPoisson's ratio of eclogite: the role of retrogressionEarth and Planetary Science Letters, Vol. 192, No. 4, pp. 523-31.GlobalEclogite - geochemistry, Poisson ratio
DS2001-0355
2001
ZhangGao, S., Kern, H., Jin, Popp, Jin, Zhang, ZhangPoisson's ratio of eclogite: the role of retrogressionEarth and Planetary Science Letters, Vol. 192, No. 4, pp. 523-31.GlobalEclogite - geochemistry, Poisson ratio
DS2001-1302
2001
ZhangZhang, H.F., Sun, M., Lu, Zhou, Zhou, Liu, ZhangGeochemical significance of a garnet lherzolite from the Dahongshan kimberlite Yangtze Craton.Geochemical Journal, Vol. 35, No. 5, pp. 315-32.China, SouthernGeochemistry, Deposit - Dahongshan
DS2003-0248
2003
ZhangChen, J.F., Xie, Z., Li, H.M., Zhang, X.D., Zhou, T.X., Park, Ahn, Chen, ZhangU Pb zircon ages for a collision related K rich complex at Shidao in the Sulu ultrahighGeochemical Journal, Vol. 37, pp. 35-46.ChinaBlank
DS200412-0319
2003
ZhangChen, J.F., Xie, Z., Li, H.M., Zhang, X.D., Zhou, T.X., Park, Ahn, Chen, ZhangU Pb zircon ages for a collision related K rich complex at Shidao in the Sulu ultrahigh pressure terrane, China.Geochemical Journal, Vol. 37, pp. 35-46.ChinaUHP, shoshonites
DS200612-0838
2006
ZhangLu, X.P., Wu, F.Y., Guo, J.H., Wilde, S.A., Yang, J.H., Liu, X.M., Zhang, XoZircon U Pb geochronological constraints on the Paleoproterozoic crustal evolution of the Eastern Block in the North Chin a Craton.Precambrian Research, Vol. 146, 3-4, pp. 138-164.ChinaGeochronology
DS200812-0959
2008
ZhangRicolleau, A., Fei, Cottrell, Watson, Zhang, Fiquet, Auzende, Roskosz, Morard, PrakapenkaNew constraints on the pyrolitic model under lower mantle conditions.Goldschmidt Conference 2008, Abstract p.A795.MantleX-ray diffraction
DS200812-1321
2008
ZhangZheng, J.P., Griffin, W.L., O'Reilly, S.Y., Hu, Zhang, Tang, Su, Zhang, Pearson, Wamg, Lu.Continental collision and accretion recorded in the deep lithosphere of central China.Earth and Planetary Science Letters, Vol. 269, 3-4 May 30, pp. 496-506.ChinaBasaltic diatremes, geochronology, craton, tectonics
DS200812-1321
2008
ZhangZheng, J.P., Griffin, W.L., O'Reilly, S.Y., Hu, Zhang, Tang, Su, Zhang, Pearson, Wamg, Lu.Continental collision and accretion recorded in the deep lithosphere of central China.Earth and Planetary Science Letters, Vol. 269, 3-4 May 30, pp. 496-506.ChinaBasaltic diatremes, geochronology, craton, tectonics
DS200912-0861
2009
ZhangZheng, J.P., Griffin, W.L., O'Reilly, S.Y., Zhao, J.H., Wu, Liu, Pearson, Zhang, Ma, Zhang, Yu, Su, TangNeoarchean ( 2.7-2.8 Ga) accretion beneath the North Chin a Craton: U Pb age, trace elements and Hf isotopes of zircons in Diamondiferous kimberlites.Lithos, Vol. 117, pp. 188-202.ChinaGeochronology
DS200912-0861
2009
ZhangZheng, J.P., Griffin, W.L., O'Reilly, S.Y., Zhao, J.H., Wu, Liu, Pearson, Zhang, Ma, Zhang, Yu, Su, TangNeoarchean ( 2.7-2.8 Ga) accretion beneath the North Chin a Craton: U Pb age, trace elements and Hf isotopes of zircons in Diamondiferous kimberlites.Lithos, Vol. 117, pp. 188-202.ChinaGeochronology
DS201112-1169
2011
ZhangZhao, Z., Niu, Y., Christensen, N.I., Zhou, Hou, Zhang, Xie, Zhang, LiuDelamination and ultra deep subduction of continental crust: constraints from elastic wave velocity and density measurement in ultra high pressure metamorphic rocksJournal of Metamorphic Geology, Vol. 29, 7, pp. 781-801.ChinaUHP - Dabie
DS201112-1169
2011
ZhangZhao, Z., Niu, Y., Christensen, N.I., Zhou, Hou, Zhang, Xie, Zhang, LiuDelamination and ultra deep subduction of continental crust: constraints from elastic wave velocity and density measurement in ultra high pressure metamorphic rocksJournal of Metamorphic Geology, Vol. 29, 7, pp. 781-801.ChinaUHP - Dabie
DS201412-0092
2014
ZhangCampbell, I., Stepanov, A., Liang, H-Y., Allen, C., Norman, M., Zhang, Y-Q, Xie, Y-W.The origin of shoshonites: new insights from the Tertiary high-potassium intrusions of eastern Tibet.Contributions to Mineralogy and Petrology, Vol. 167, 3, pp. 1-22.Asia, TibetShoshonite
DS202001-0017
2019
ZhangHuang, C., Zhang, N, Li, Z.X., Dang, Z.Modeling the inception of supercontinent breakup: stress state and the importance of orogens.Geochemistry, Geophysics, Geosystems, in press available pdf 20p.Globalgeodynamics

Abstract: The relative significance of various geodynamic mechanisms that drive supercontinent breakup is unclear. A previous analysis of extensional stress during supercontinent breakup demonstrated the importance of the plume-push force relative to the dragging force of subduction retreat. Here, we extend the analysis to basal traction (shear stress) and cross-lithosphere integrations of both extensional and shear stresses, aiming to understand more clearly the relevant importance of these mechanisms in supercontinent breakup. More importantly, we evaluate the effect of preexisting orogens (mobile belts) in the lithosphere on supercontinent breakup process. Our analysis suggests that a homogeneous supercontinent has extensional stress of 20-50 MPa in its interior (<40° from the central point). When orogens are introduced, the extensional stress in the continents focuses on the top 80-km of the lithosphere with an average magnitude of ~160 MPa, whereas at the margin of the supercontinent the extensional stress is 5-50 MPa. In both homogeneous and orogeny-embedded cases, the subsupercontinent mantle upwellings act as the controlling factor on the normal stress field in the supercontinent interior. Compared with the extensional stress, shear stress at the bottom of the supercontinent is 1-2 order of magnitude smaller (0-5 MPa). In our two end-member models, the breakup of a supercontinent with orogens can be achieved after the first extensional stress surge, whereas for a hypothetical supercontinent without orogens it starts with more diffused local thinning of the continental lithospheric before the breakup, suggesting that weak orogens play a critical role in the dispersal of supercontinents.
DS1994-1753
1994
Zhang, A.Taylor, W.R., Zhang, A., Janse, A.J.A.Leucitites and other potassic igneous rocks of the Yangtze Craton, southChin a and their diamond bearing potential.Geological Association of Canada (GAC) Abstract Volume, Vol. 19, p. PosterChinaAlkaline rocks, Yangtze Craton
DS1996-1593
1996
Zhang, A.Zhang, A., Griffin, W.L., Win, T.T., Xu, D.Lithosphere mapping in eastern Chin a garnets and spinels from kimberlitic and lamproitic rocks.International Geological Congress 30th Session Beijing, Abstracts, Vol. 2, p. 398.ChinaGeothermometry, Kimberlites, lamproites
DS1998-1625
1998
Zhang, A.Zhang, A., Griffin, W.L., Ryan, C.G., Andrew, A.Conditions of diamond formation beneath the Sino-Korean Craton:paragenesis, temperatures and isotopic cond.7th International Kimberlite Conference Abstract, pp. 992-4.China, LiaoningMineral inclusions, Deposit - Pipe # 50, Shengli #1, Hongqi # 6
DS1999-0828
1999
Zhang, A.Zhang, A., Griffin, W.L., Ryan, C.G., Andrew, A.S.Conditions of diamond formation beneath Liaoning and Shandong Provinces: parageneses, temperatures... carbon7th International Kimberlite Conference Nixon, Vol. 2, pp. 940-47.China, Shandong, LiaoningGeochronology, diamond inclusions, major element analys, Deposit - Mengyin
DS1992-1736
1992
Zhang, B.Zhang, B., Halls, H.C.Does another thrust sheet lie above the Kapuskasing Zone?Eos Transactions, Vol. 73, No. 14, April 7, supplement abstracts p. 92OntarioTectonics, Kapuskasing Zone
DS1998-0564
1998
Zhang, B.Halls, H.C., Zhang, B.Uplift structure of the southern Kapuskasing zone from 2.45 Ga dike swarmdisplacement.Geology, Vol. 26, No. 1, Jan. pp. 67-70.OntarioDike swarm, Kapuskasing tectonic zone
DS2002-1773
2002
Zhang, B.Zhang, H., Gao, S., Zhong, Z., Zhang, B., Zhang, L., Hu, S.Geochemical and Sr Nd Pb isotopic compositions of Cretaceous granitoids: constraintsChemical Geology, Vol. 186, 2-4, pp. 281-99.China, easternUHP, Dabie Shan area
DS2003-0537
2003
Zhang, B.Halls, H.C., Zhang, B.Crustal uplift in the southern Superior Province, Canada revealed by paleomagnetismTectonophysics, Vol. 362, 1-4, pp. 123-46.Ontario, ManitobaTectonics
DS2003-0754
2003
Zhang, B.Kuang, S., Zhang, B.Crust mantle interaction in Dabie Orogenic belt, central China: geochemical evidenceChinese Journal of Geochemistry, Vol. 22, 3, pp. 231-43.ChinaUHP
DS2003-0820
2003
Zhang, B.Ling, W., Gao, S., Zhang, B., Li, H., Liu, Y., Cheng, J.Neoproterozoic tectonic evolution of the northwestern Yangtze Craton, South China:Precambrian Research, Vol. 122, 1-4, pp.111-140.China, RodiniaTectonics
DS200412-1060
2003
Zhang, B.Kuang, S., Zhang, B.Crust mantle interaction in Dabie Orogenic belt, central China: geochemical evidence from late Cretaceous basalts.Chinese Journal of Geochemistry, Vol. 22, 3, pp. 231-43.ChinaUHP
DS200412-1139
2003
Zhang, B.Ling, W., Gao, S., Zhang, B., Li, H., Liu, Y., Cheng, J.Neoproterozoic tectonic evolution of the northwestern Yangtze Craton, South China: implications for amalgamation and break up ofPrecambrian Research, Vol. 122, 1-4, pp.111-140.China, RodiniaTectonics
DS200512-1239
2005
Zhang, B.Zhang, B., Guo, W.L., Dai, Y.T.Touch graphite and turn it into diamond? Physical mechanics of carbon matters under ultrahigh pressure.Physics Review Letters, Vol. 34, 7, pp. 498-502.TechnologyCarbon
DS201212-0811
2012
Zhang, B.Zhang, B., Yoshino, T., Wu, X., Matsuzaki, T., Shan, S., Katsura, T.Electrical conductivity of enstatite as a function of water content: implications for the electrical structure in the upper mantle.Earth and Planetary Science Letters, Vol. 357-358, pp. 11-20.MantleHT Hp hydrous conditions
DS1995-0580
1995
Zhang, B.R.Gao, S., Zhang, B.R., Guo, X-M.Silurian Devonian provenance changes of South Qinling Basins: implicationfor accretion of Yangtze craton.Tectonophysics, Vol. 250, No. 1/3, Nov. 15, pp. 183-ChinaCraton, North China
DS1998-0465
1998
Zhang, B.R.Gao, S., Zhang, B.R., Zhao, Z.D.How mafic is the lower continental crust?Earth and Planetary Science Letters, Vol. 161, No. 1-4, Sept. 1, pp. 101-118.MantleMagmatism
DS2002-1720
2002
Zhang, C.Windley, B.F., Kroner, A., Guo, J., Qu, G., Li, Y., Zhang, C.Neoproterozoic to Paleozoic geology of the Altai Orogen NW China: new zircon age dat a and tectonic evolution.Journal of Geology, Vol. 110, 6, pp. 719-738.ChinaGeochronology
DS200512-1240
2005
Zhang, C.Zhang, C., Manheim, F.T., Hinde, J., Grossman, J.N.Statistical characteristics of a large geochemical database and effect of sample size.Applied Geochemistry, Vol.20, 10, Oct. pp. 1857-1874.TechnologyGeochemistry - not specific to diamonds
DS200912-0851
2009
Zhang, C.Zhang, C., Duan, Z.A model for C O H fluid in the Earth's mantle.Geochimica et Cosmochimica Acta, Vol. 73, 7, pp. 2089-2102.MantleWater
DS201112-0180
2011
Zhang, C.Cheng, H., Vervoort, J.D., Li, X., Zhang, C., Li, Q., Zheng, S.The growth interval of garnet in the UHP eclogites from the Dabie orogen, China.American Mineralogist, Vol. 96, 8-9, pp. 1300-1307.ChinaUHP
DS201112-0181
2011
Zhang, C.Cheng, H., Zhang, C., Vervoot, J.D., Wu, Y., Zheng, Y., Zheng, S., Zhou, Z.New Lu-Hf geochronology constrains the onset of continental subduction in the Dabie Orogen.Lithos, Vol. 121, 1-4, pp. 41-54.ChinaSubduction
DS201112-1160
2011
Zhang, C.Zhang, C., Zhang, L., Van Roermund, H., Song, S., Zhang, G.Petrology and SHRIMP U-Pb dating of Xitieshan eclogite, North Quidam, UHP metamorphic belt, NW China.Journal of Asian Earth Sciences, Vol. 32, 4, pp. 752-767.ChinaUHP
DS201412-0871
2014
Zhang, C.Song, S., Niu, Y., Zhang, C., Zhang, L.Continental orogenesis from ocean subduction, continent collision/subduction, to orogen collapse, and orogen recycling: the example of the North Qaidam UHPM belt, NW China.Earth Science Reviews, Vol. 129, pp. 59-84.ChinaUHP
DS201607-1387
2016
Zhang, C.Yang, J., Dilek, Y., Pearce, J., Schertl, H-P., Zhang, C.Diamonds and crustal recycling into deep mantle.IGC 35th., Session The Deep Earth 1 p. abstractMantleSubduction
DS201703-0440
2017
Zhang, C.Wu, F-Y.,Mitchell, R.H., Li, Q-L., Zhang, C., Yang, Y-H.Emplacement age and isotopic composition of the Prairie Lake carbonatite complex, northwestern Ontario, Canada.Geological Magazine, Vol. 154, 2, pp. 217-236.Canada, OntarioCarbonatite

Abstract: Alkaline rock and carbonatite complexes, including the Prairie Lake complex (NW Ontario), are widely distributed in the Canadian region of the Midcontinent Rift in North America. It has been suggested that these complexes were emplaced during the main stage of rifting magmatism and are related to a mantle plume. The Prairie Lake complex is composed of carbonatite, ijolite and potassic nepheline syenite. Two samples of baddeleyite from the carbonatite yield U-Pb ages of 1157.2±2.3 and 1158.2±3.8 Ma, identical to the age of 1163.6±3.6 Ma obtained for baddeleyite from the ijolite. Apatite from the carbonatite yields the same U-Pb age of ~1160 Ma using TIMS, SIMS and laser ablation techniques. These ages indicate that the various rocks within the complex were synchronously emplaced at about 1160 Ma. The carbonatite, ijolite and syenite have identical Sr, Nd and Hf isotopic compositions with a 87Sr/86Sr ratio of ~0.70254, and positive eNd