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SDLRC - Scientific Articles all years by Author - U


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 - U
Posted/
Published
AuthorTitleSourceRegionKeywords
DS1992-1578
1992
U.S. Department of InteriorU.S. Department of InteriorSolid Minerals Reclamation HandbookU.s. Department Of The Interior, GlobalBook -ad
DS1988-0715
1988
U.S. Geological SurveyU.S. Geological SurveyGeologic map of Kentucky , sesuicentennial editionU.s. Geological Survey, 1: 500, 000 1 sheet in colour $ 5.25KentuckyMap -geology
DS1860-0688
1891
U.S.G.S. Mineral Resources YearbookU.S.G.S. Mineral Resources YearbookDiamonds in Meteorite, Canon DiableU.S.G. Mineral Resources for the Year 1890-1891, PP. 541-2.United States, Arizona, Colorado PlateauMeteorite
DS1860-0735
1892
U.S.G.S. Mineral Resources YearbookU.S.G.S. Mineral Resources YearbookElliott County, Kentucky PeridotiteU.S.G.S. Mineral Resources of The United States For 1891, P. 542.United States, KentuckyDiamond Occurrence
DS1860-0736
1892
U.S.G.S. Mineral Resources YearbookU.S.G.S. Mineral Resources YearbookPrecious Stones 1891U.S.G.S.Mineral Resources of The United States For 1891, PP. 540-541.United States, Minnesota, Wisconsin, Great LakesDiamond Occurrence
DS1860-0779
1893
U.S.G.S. Mineral Resources YearbookU.S.G.S. Mineral Resources YearbookDiamonds in Meteorite, Canon DiabloU.S.G.S. Mineral Resources Yearbook, PP. 683-685.United States, Arizona, Colorado PlateauMeteorite
DS1860-0790
1893
U.S.G.S. Mineral Resources YearbookU.S.G.S. Mineral Resources YearbookDiamonds in Kentucky, 1892Mineral Resources of The United States For 1892, PP. 756-760.United States, Kentucky, Appalachia, Virginia, Georgia, Great Lakes, WisconsinDiamond occurrence
DS201804-0746
2018
Uang, Y.Su, S-H., Uang, Y., Qu, S., Liu, R., Li, L.Microdiamond/PLA ( Polylactic acid) composites with enhanced thermal conductivity through improving filler/matrix interface compatibility.Diamond & Related Materials, Vol. 81, pp. 161-167.Technologymicrodiamonds

Abstract: Polylactic acid (PLA)-based composites filled with 20 or 50 µm-diameter microdiamond are synthesized by hot pressing. Through improving the interface compatibility between the filler and the matrix enabled by octadecylamine (ODA) coating on the microdiamond particles, the maximum thermal conductivity of the composites is 2.22 Wm- 1 K- 1, which is a ~ 10-fold increase in comparison with that of pure PLA. According to the analysis on the glass transmission of the composites and the surface chemistry of the fillers using DSC, FI-IR, and Raman microscopy, it is found out that ODA is connected with the -OH group on the microdiamond surface through hydrogen bonding and an interfacial structure of PLA/ODA/microdiamond is formed. Thus, the interfacial thermal transport between PLA and microdiamond is significantly improved, leading to the enhancement of the thermal conductivity of the composites. Our work presents a simple method to modify the surface chemistry of microdiamond and to improve the interface compatibility between microdiamond and PLA. The microdiamond/PLA composites with large thermal conductivity are promising thermal management materials used for modern electronic products.
DS1994-1807
1994
Uarov, V.F.Uarov, V.F.The upper mantle structure of the Yakutian kimberlite province, easternRussia.Pure And Applied Geophysics, Vol. 142, No. 2, pp. 311-318.Russia, YakutiaMantle, Structure, kimberlite
DS201904-0790
2019
Ubide, T.Ubide, T., Mollo, S., Zhao, J-x., Nazzari, M., Scarlato, P.Sector zoned clinopyroxene as a recorder of magma history, eruption triggers, and ascent rates.Geochimica et Cosmochimica Acta, dor:10.1016/j.gca.2019.02.021Mantlemagmatism

Abstract: Sector-zoned clinopyroxene is common in igneous rocks, but has been overlooked in the study of magmatic processes. Whilst concentric zoning is commonly used as a record of physicochemical changes in the melt feeding crystal growth, clinopyroxene is also highly sensitive to crystallisation kinetics. In sector-zoned crystals, the fidelity of compositional changes as recorders of magma history is dubious and the interplay between thermodynamic and kinetic controls remains poorly understood. Here we combine electron probe and laser ablation micro-chemical maps of titanaugite crystals from Mt. Etna (Sicily, Italy) to explore the origin of sector zoning at the major and trace element levels, and its implications for the interpretation of magmatic histories. Elemental maps afford the possibility to revisit sector zoning from a spatially controlled perspective. The most striking observation is a clear decoupling of elements into sectors vs. concentric zones within single crystals. Most notably, Al-Ti enrichments and Si-Mg depletions in the prism sectors {1?0?0}, {1?1?0} and {0?1?0} relative to the hourglass (or basal) sectors {-1?1?1} correlate with enrichments in rare earth elements and highly charged high field strength elements due to cation exchanges driven by kinetic effects. In contrast, transition metals (Cr, Ni, Sc) show little partitioning into sectors and strong enrichments in concentric zones following resorbed surfaces, interpreted as evidence of mafic recharge and magma mixing. Our results document that kinetic partitioning has minor effects on the compositional variations of cations with low charge relative to the ideal charge/radius of the structural site they occupy in the clinopyroxene lattice. We suggest that this may be due to a lower efficiency in charge balance mechanisms compared to highly charged cations. It follows that compatible metals such as Cr can be considered trustworthy recorders of mafic intrusions and eruption triggers even in sector-zoned crystals. We also observe that in alkaline systems where clinopyroxene crystallisation takes place at near-equilibrium conditions, sector zoning should have little effect on Na-Ca partitioning and in turn, on the application of experimentally calibrated thermobarometers. Our data show that whilst non-sector-zoned crystals form under relatively stagnant conditions, sector zoning develops in response to low degrees of undercooling, such as during slow magma ascent. Thus, we propose that the chemistry of sector-zoned crystals can provide information on magma history, eruption triggers, and possibly ascent rates.
DS200812-1191
2008
Ubilius, M.J.Ubilius, M.J., Wong, M.Building partnerships with indigenous people. ( not specific to diamonds).Engineering and Mining Journal, May, p. 52,54-55.GlobalSocial responsibility
DS1950-0100
1952
UbischEckermann, H. Von, Ubisch, Wickman, F.E.A Preliminary Investigation Into the Isotopic Composition Of Carbon from Some Alkaline Intrusions.Geochimica Et Cosmochimica Acta, Vol. 2, PP. 207-210.Sweden, ScandinaviaAlnoite, Isotope Chemistry
DS1984-0238
1984
Uchanov, A.V.Dmitriev, L.V., Sobolev, A.V., Uchanov, A.V., Malaysheva, T.V.Primary Differences in Oxygen Fugacity and Depth of Melting in the Mantle Source Regions for Oceanic Basalts.Earth Plan. Sci. Letters, Vol. 70, PP. 303-310.GlobalMineral Chemistry, Mid Ocean Ridge Basalt (morb)
DS2002-1776
2002
Uchida, T.Zhang, J., Wang, L., Weidner, D.J., Uchida, T., Xu, J-A.The strength of moissaniteAmerican Mineralogist, Vol. 87, pp. 1005-8.GlobalMoissanite, Petrology - experimental
DS200512-0819
2005
Uchida, T.Pantea, C., Voronin, G.A., Waldek Zerda, T., Zhang, J., Wang, Y., Uchida, T., Zhao, Y.Kinetics of SIC formation during high P T reaction between diamond and silicon.Diamond and Related Materials, Vol. 14, 10, pp. 1611-1615.TechnologySIC
DS1995-1869
1995
Uchimura, H.Tanaka, H., Kono, M., Uchimura, H.Some global features of palaeointensity in geological timeGeophys. Journal of International, Vol. 120, pp. 97-102GlobalVolcanics, Paleointensity database
DS202007-1182
2020
Uchiyama, H.Tanaka, R., Sakamaki, T., Ohtani, E., Fukui, H., Kamada, S., Suzuki, A., Tsutsui, S., Uchiyama, H., Baron, A.Q.R.The sound velocity of wustite at high pressures: implications for low-velocity anomalies at the base of the lower mantle.Progress in Earth and Planetary Science, Vol. 7, 23, 7p. PdfMantlewustite

Abstract: The longitudinal sound velocity (VP) and the density (?) of wüstite, FeO, were measured at pressures of up to 112.3?GPa and temperatures of up to 1700?K using both inelastic X-ray scattering and X-ray diffraction combined with a laser-heated diamond-anvil cell. The linear relationship between VP and ?, Birch’s law, for wüstite can be expressed as VP = 1.55 (1) × ? [g/cm3] - 2.03 (8) [km/s] at 300?K and VP = 1.61 (1) × ? [kg/m3] - 2.82 (10) [km/s] at 1700?K. The sound velocity of wüstite is significantly lower than that of bridgmanite and ferropericlase under lower mantle conditions. In other words, the existence of wüstite in the lower mantle can efficiently decrease the seismic velocity. Considering its slow velocity and several mechanisms for the formation of FeO-rich regions at the core-mantle boundary, we confirm earlier suggestions indicating that wüstite enrichment at the bottom of the Earth’s mantle may contribute to the formation of denser ultra-low velocity zones.
DS1989-1504
1989
Udagawa, Y.Tohji, K., Udagawa, Y.X-ray Raman scattering as a substitute for softX-rayextended X-ray absorption fine structurePhys. Rev. B., Condensed Matter, Vol. 39, No. 11, pp. 7590-7594GlobalDiamond morphology, Spectroscopy
DS1960-0405
1963
Udas, G.R.Sukheswala, R.N., Udas, G.R.Note on the Carbonatite of Ambadongar and its Economic Potentialities.Science And Culture., Vol. 29, PP. 563-568.India, GujaratCarbonatite
DS1975-1248
1979
UdayakumariUdayakumariRough Diamonds to India. Importance of the D.t.cEconomic Times, Vol. 105, Nov.IndiaDiamond Marketing
DS200612-1448
2006
Udd, J.Udd, J.Arctic mining in Canada.Mining Magazine, Feb. pp. 26-27.Canada, Northwest Territories, NunavutMining - brief outline, Arctic conditions
DS1999-0753
1999
Udd, J.E.Udd, J.E., Betournay, M.C.Some ground control considerations for mining in permafrostMining in the Arctic, Udd and Keen editors, Balkema, pp. 43-51.Northwest Territories, canadaMining - permafrost - not specific to diamonds, Overview
DS202105-0777
2021
Ude, A.Modise, E.G., Zungeru, M.A., Chuma, J.M., Prabaharan, S.R.S., Mtengi, B., Ude, A., Nedev, Z.The new paradox of dual modality x-ray diamond sorting.IEEE Photonics Journal, Researchgate 35102286, April, 28p. PdfGloballuminescence

Abstract: Modern-day diamond sorting is achieved through the application of x-ray luminescence (XRL) and x-ray transmission (XRT) techniques. Sorting with XRL is limited to the class range of 1.25mm to 32mm because of self-absorption associated with larger diamonds, greater than 32mm. The effect of self-absorption is also a high-energy phenomenon in XRL. XRT is limited to sorting large size diamonds as the technique suffers poor contrast for diamonds smaller than 10mm. XRT measurements are immune to self-absorption for all sample sizes, while XRL measurements have good contrast for particles smaller than 32mm. The applications of these techniques have hitherto been used independently of each other and have subsequently progressed mutually exclusively. Here we analytically show a new paradox of a dual-modality X-ray diamond sorting combining XRL and XRT techniques' strengths. Key features of our new paradoxical model performance are contrast mitigation for small particles and self-absorption rejection for a large particle at high energy as well as improved particle detectability and classification.
DS200812-1002
2007
Udell, A.Sandeman, H.A., Udell, A.Whither the kimberlite indicator and diamond database (KIDD) and kimberlite indicator mineral chemistry Database ( KIMC): integration into GOMAP for on-line35th. Yellowknife Geoscience Forum, Abstracts only p. 55.Canada, Northwest TerritoriesDatabase - KIDD and KIMC
DS1997-0146
1997
Udey, N.Burianyk, M.J.A., Kanasewich, E.R., Udey, N.Broadside wide angle seismic studies and three dimensional structure of the crust in the southeast CordilleraCanadian Journal of Earth Sciences, Vol. 34, No. 8, August pp. 1156-66.Cordillera, British Columbia, AlbertaGeophysics - seismics, Structure
DS1975-1249
1979
Udokina, N.G.Udokina, N.G., et al.Eclogites of the Bohemian Massif and Metamorphic Formations of the Ussr, Some Features of Their Geologic Position and Material Composition.In: Afanas'yev, G.d. Editor, Moscow: Izd. Nauka., International Geological Correlation Programme (IGCP) No. 2, PP. 101-117.RussiaBlank
DS1986-0770
1986
Udoyev, A.A.Sobolev, V.V., Slobodskoy, V.Ya., Selyukov, S.N., Udoyev, A.A.Transformation of chaoite into other hydrocarbon phases.(Russian)Zapiski Vsesoy. Mineral. Obshchestva, (Russian), pp. 218-221RussiaBlank
DS201212-0379
2012
Udvardi, B.Kovacs, I., Green, D.H., Rosenthal, A., Hermann, J., St.O'Neill, H., Hibberson, W.O., Udvardi, B.An experimental study of water in nominally anhydrous minerals in the upper mantle near the water saturated solidus.Journal of Petrology, Vol. 53, 10, pp. 2067-2093.MantleWater content
DS2002-0053
2002
Uehara, S-I.Aoya, M., Uehara, S-I., Wallis, S.R.Thermal consequences of a subduction boundary jump: a numerical model for generating subduction related....Tectonics, Vol.21,1, Feb.pp. 17p.MantlePressure temperature paths - clockwise, Subduction - geothermometry
DS1982-0361
1982
Ueng, W.L.Larue, D.K., Ueng, W.L.Early Proterozoic Arc-continent Collision Orogen, Lake Superior Region: Tectono-stratigraphic Terranes.Geological Society of America (GSA), Vol. 14, No. 7, P. 542, (abstract.).GlobalMid-continent
DS201412-0635
2014
Ueno, Y.Nomura, R., Uesugi, K., Ohishi, Y., Tsuchiyama, A., Miyake, A., Ueno, Y.Low core mantle boundary temperature inferred from the solidus of pyrolite.Science, Vol. 343, 6170 pp. 522-525.MantleMelting
DS201701-0011
2016
Uenver-Thiele, I.Fschroeder-Frerkes, F., Woodland, A.B., Uenver-Thiele, I., Klimm, K., Knapp, N.Ca-Eskola in corporation in clinopyroxene: limitations and petrological implications for eclogites and related rocks.Contributions to Mineralogy and Petrology, Vol. 171, pp. 101-TechnologyEclogite

Abstract: Clinopyroxene is an essential mineral in eclogitic rocks. It commonly contains minor amounts of the defect-bearing Ca-Eskola (CaEs, Ca0.5?0.5AlSi2O6) component, with higher concentrations generally considered to indicate a high-pressure origin at least within the coesite stability field. Changes in pressure and temperature conditions can lead to exsolution of this component as a free SiO2 phase, which may have a number of petrological implications. This makes it important to understand the factors that maximize CaEs incorporation in clinopyroxene. We have undertaken a series of experiments at high pressures and temperatures (4-10 GPa and 1000-1350 °C) to further investigate the systematics of CaEs incorporation in eclogite-like clinopyroxene and the factors responsible for maximizing CaEs contents. Two simple chemical systems were chosen that allow unambiguous interpretation of the results: (1) CMAS + H2O and (2) two compositions in the NCMAS system. All experimental products contained clinopyroxene and garnet along with either a free SiO2 phase or a silicate melt. Coexisting garnet is grossular-rich, generally with Xgr = 0.67. Compositional variations are attributable to the presence or absence of melt and changes in modal amounts of garnet at different pressure-temperature conditions. Even small amounts of H2O lower the solidus temperature and the presence of a melt reduces the SiO2 activity, which destabilizes the CaEs component in clinopyroxene. The CaEs and the Ca-Tschermaks (CaTs, CaAl2SiO6) components in clinopyroxene decrease with increasing jadeite mole fraction, which is also a function of pressure and bulk Al content. Modeling X-ray powder diffraction data yields a molar volume for the CaEs endmember of VCaEs = 60.87(63) cm3, which reasonably agrees with a literature value that was estimated from natural samples. In the presence of coexisting coesite, the CaEs and CaTs do not vary independently of each other, being controlled by the internal equilibrium 2CaEs = CaTs + 3SiO2 (coesite). This relation, observed in simple systems (i.e., CMAS ± Na), is also obeyed by clinopyroxene in more complex, natural analog bulk compositions. An assessment of available experimental data reveals a maximum of 15-18 mol% CaEs in eclogitic clinopyroxene at conditions corresponding to 130-180 km depth. CaEs contents are maximized at high temperatures; i.e., at or near the solidus in the presence of coesite. Thus, this study supports the role of CaEs exsolution in contributing to melt generation during upwelling of eclogite bodies in the mantle, albeit with some caveats. Somewhat higher maximum CaEs contents (~20 mol%) are found in Ca and Al-rich bulk compositions, such as grospydite xenoliths. Such bulk compositions also seem to require the coexistence of kyanite. Other Ca and Al-rich rock types, like rodingites, should have the potential of containing CaEs-rich clinopyroxenes, except that they are SiO2-undersaturated. This emphasizes the further role of bulk composition, in addition to high temperatures, in achieving maximum CaEs contents in high-pressure clinopyroxene.
DS200812-0849
2007
Uenzelmann-Neben, G.Parseigla, N., Gohl, K., Uenzelmann-Neben, G.Deep crustal structure of the sheared South African continental margin: first results of the Agulhas-Karoo Geoscience Transect.South African Journal of Geology, Vol. 110, 2-3, Sept. pp. 393-406.Africa, South AfricaGeophysics - seismics
DS200912-0456
2009
Uesugi, H.Lu, T., Odaki, T., Yasunaga, K., Uesugi, H.A fancy reddish brown diamond with new optical absorption features.Journal of Gemmology, Vol. 31, 2-4, pp. 73-76.TechnologyDiamond colour
DS200812-1039
2008
Uesugi, K.Senda, R., Kogiso, T., Suzuki, K., Suzuki, T., Uesugi, K., Takeuchi, A., Sukari, Y.Detection of sub micro scale highly siderophile element nugget in kimberlite by synchrontron radiation X ray fluoresence analysis.Goldschmidt Conference 2008, Abstract p.A847.Europe, GreenlandSpectroscopy
DS201412-0635
2014
Uesugi, K.Nomura, R., Uesugi, K., Ohishi, Y., Tsuchiyama, A., Miyake, A., Ueno, Y.Low core mantle boundary temperature inferred from the solidus of pyrolite.Science, Vol. 343, 6170 pp. 522-525.MantleMelting
DS201312-0384
2013
Uesugi, M.Hezel, D.C., Friedrich, J., Uesugi, M.Looking inside 3D structures of meteorites.Geochimica et Cosmochimica Acta, Vol. 116, pp. 1-4.TechnologyTomography
DS201511-1840
2015
Uetsuka, H.Harada, Y., Hishinuma, R., Terashima, C., Uetsuka, H., Nakata, K., Kondo, T., Yuasa, M., Fujishima, A.Rapid growth of diamond and its morphology by in-liquid plasma CVD.Diamond and Related Materials, in press available, 16p.TechnologySynthetics

Abstract: Diamond synthesis and its morphology by in-liquid plasma chemical vapor deposition (CVD) method are investigated in this study. Diamond films were grown on Si substrates from mixed alcohol solution. Very high growth rate of 170 µm/h was achieved by this method. Microcrystalline and nanocrystalline diamond films were formed in different conditions. In the case of microcrystalline film, the shapes of diamond grains depend on the location in the film. All morphological differences in this study can be explained by the same mechanism of conventional gas phase CVD method. It means diamond morphology by in-liquid plasma CVD method can be controlled by process parameters as well as gas phase CVD method.
DS201712-2733
2017
Ugalde, H.Ugalde, H., Furlan, A., Veglio, E., Milkereit, B., Mirza, A.M., Elliott, B.Airborne MAG/EM dat a integration of Slave Province kimberlites, Northwest Territories.45th. Annual Yellowknife Geoscience Forum, p. 82 abstractCanada, Northwest Territoriesgeophysics

Abstract: As part of the Slave Province Geophysical, Surficial Materials and Permafrost Study, the Northwest Territories Geological Survey (NTGS) commissioned high resolution geophysical surveys in the Slave Geological Province (SGP). The high resolution aeromagnetic survey was flown from February to April 2017 and comprise 87,600 line-km of data flown at 100 m line spacing and nominal aircraft terrain clearance was 60 m with drape flying over the Central Slave craton block. The horizontal gradient magnetic and frequency domain EM (FDEM) survey was flown from February to March 2017 acquired at 75 m line spacing over 6 other blocks with nominal terrain clearance of 60 m to maintain bird height of 25 m, covering 4,580 line-km (Munn Lake, Margaret Lake, Zyena Lake, Lac de Gras West, Big Blue and Mackay Lake). The objective of this work is to develop multi-parameter models to help mineral exploration and mining companies better understand the range of geophysical signatures associated with kimberlites in the SGP. A regular geophysical-based approach for kimberlite exploration usually involves inverting geophysical data with limited geological input. In this contribution we present different ways of looking at the geophysical data and try to obtain a more thorough geological understanding out of it. The workflow starts with a complete GIS compilation of all the ancillary data available in the area: previous industry reports, geology, remote sensing, topographic layers. Secondly, we compute a number of interpretation sub-products from the total magnetic intensity data (tilt derivatives, analytic signal, and other edge detection routines). The next stage involves the computation of a susceptibility distribution from the FDEM data (Tschirhart et al, 2015). With this we are able to generate a magnetic model of the near surface susceptibility distributions, which are then subtracted from the observed data. The resultant map shows anomalous sources that could be associated to either remanent magnetization and/or deeper sources. Following the work of Sterritt (2006), post-emplacement alteration is ubiquitous in kimberlite pipes. Alteration results in production of secondary oxide minerals and alteration of primary oxide minerals to phases with different magnetic susceptibilities (e.g. non-magnetic iron oxides). This can lead to a dramatic increase of magnetic susceptibility due to serpentinization (Clark, 1997). On the other hand, remanent magnetization can change the polarity of the observed magnetic anomalies or even completely remove the expected signature due to an equal but opposite combination of remanent and induced magnetic components. Therefore, a thorough compilation of petrophysical and mineralogical data over kimberlites and altered rocks in the vicinity of known occurrences is critical for the geological understanding of the existing geophysical data. This contribution will show some preliminary processing and compilation work completed over the Slave province kimberlites using the newly acquired geophysical data.
DS201812-2894
2018
Ugalde, H.Ugalde, H., Milkereit, B., Lenauer, I., Morris, W.A., Mirza, A.M., Elliott, B.Airborne Mag/EM data integration of Slave province kimberlites, NWT.2018 Yellowknife Geoscience Forum , p. 84. abstractCanada, Northwest Territoriesgeophysics - Mag, EM

Abstract: As part of the Slave Province Geophysical, Surficial Materials and Permafrost Study, the Northwest Territories Geological Survey (NTGS) commissioned high resolution geophysical surveys in the Slave Geological Province (SGP). This work focuses on the analysis of six horizontal gradient magnetic and frequency domain EM (FDEM) surveys that were flown from February to March 2017 (Munn Lake, Margaret Lake, Zyena Lake, Lac de Gras West, Big Blue and Mackay Lake). All surveys were acquired at 75 m line spacing with nominal terrain clearance of 60 m to maintain bird height of 25 m. They total 4,580 line-km. We use the FDEM data to locate areas of potential remanent magnetization, and thus additional areas that could be related to kimberlite bodies. The area is part of the central Slave Craton, which is dominated by Archean granitoid rocks and Archean metasedimentary rocks. Heaman et al. (2013) identifies several distinct domains based on kimberlite ages in the area. Central Slave is characterized by Tertiary/Cretaceous age kimberlites, whereas the southern part exhibits kimberlites of Cambrian age. This have important implications for the orientation of the remanent magnetization vector. The methodology involves the use of a homogeneous half-space model to invert the data for dielectric permittivity, relative magnetic permeability, apparent resistivity and magnetic susceptibility. Using this model, we calculated Conductivity-Depth-Images (CDIs) for all the EM data. The susceptibility distribution from the EM data (MagEM) is then plotted against an apparent susceptibility derived from the total field data for the main survey via standard FFT calculation (MagTMI). Major differences between both distributions are usually associated to remanence. Once we identify areas of potential remanent magnetization, we use Helbig analysis to estimate the direction of magnetization. The validity of this model is verified by comparison of the computed remanence direction with the appropriate Apparent Polar Wander Path (APWP). We find a good correlation of APWP directions with the estimated remanence, however, a viscous remanence component subparallel to the present's day Earth field is sometimes required. Finally, we show the integration of these results with a structural interpretation of the aeromagnetic data and potential alteration zones derived from Aster imagery for all 6 blocks
DS201705-0884
2017
Ugapeva, S.Ugapeva, S., Goryainov, S., Afanasiev, V., Ponkratov, K.Raman mapping of mechanical stress field in diamond around a chromite inclusion.European Geosciences Union General Assembly 2017, Vienna April 23-28, 1p. 11676 AbstractTechnologyDiamond inclusions
DS202010-1882
2020
Ugapeva, S.Ugapeva, S., Afanasiev, V., Pavlushin, A., Eliseev, A.Main features of Yakutites from Ebelyakh placer.World Multidisciplinary Earth Sciences Symposium ( researchgate), 7p. PdfRussialonsdaleite

Abstract: Yakutites (polycrystalline diamonds with lonsdaleite admixture) from the Ebelyakh placer (Yakutia, Russia) have been studied by optical microscopy, Raman spectroscopy, and neutron diffraction in order to reveal their difference from tagamite-hosted diamonds of the Popigai impact crater. The yakutite aggregates are 2.0 mm to 13.0 mm in size and have a shapeless morphology or sometimes preserve hexagonal contours of primary graphite. Raman spectra are characterized by a broadened line in the region of cubic 3C diamond, which is interpreted as the sum of spectra from cubic 3C diamond and three peaks related to Lonsdaleite: 1338 (E1g), 1280 (A1g) and 1224 (E2g). On the surface of yakutites revealed the presence of a silicate glass film. The main elements are iron, silicon from the surrounding silicate matter. Neutron stress diffractometry showed the content of diamond and Lonsdaleite in the sample of yakutite by 50%, two cases of preferential orientation of two phases were recorded: (110) diamond // (110) Lonsdaleite; (111) diamond // (001) Lonsdaleite. Both yakutites and tagamite-hosted diamonds are of impact origin and share similarity in the phase composition consisting of more abundant diamond and subordinate amounts of lonsdaleite. Differences between them depend on the place of their formation. Yakutites were formed in the epicenter of the explosion and were thrown out of the crater at a distance of more than 550 km in radial directions, and from the vertical ejection - they got back to the crater. In tagamites, impact diamonds were formed simultaneously with the rock melting due to the shock wave that came from the epicenter. The presence of a silicate glass film on the surface of yakutites indicates that they were hardened after ejection from the crater. Yakutites represent distinct mineral fraction outside the crater. They are found as placers along with common diamonds and other detritus. Within the crater they are genetically related to suevites - tuffaceous component of the impactites and enter the crater placers due to the physical weathering of suevites. Tagamite diamonds practically do not occur in the crater placers, because tagamite is a very hard rock and in the absence of chemical weathering these diamonds can't be released. Thus, diamonds from tagamites and yakutites, having a common impact nature, differ in some properties determined by the place of formation and post-impact history.
DS202102-0238
2020
Ugapeva, S.Zayakina, N., Ugapeva, S., Oleinikov, O.Rare hydrated magnesium carbonate minerals of the kimberlite pipe Obnazhennaya, the Yakutian kimberlite province.6th World Multidisciplenary Earth Sciences Symposium IOP Publ., 9p. PdfRussiadeposit - Obnazhennaya

Abstract: The first discovery of hydrated magnesium carbonates, dypingite and nesquehonite, in the kimberlite pipe Obnazhennaya of the Kuoyka field, the Yakutian kimberlite province is described. The pipe is composed of kimberlite breccia with abundant diverse xenoliths of practically intact mantle rocks. Olivine in phenocrysts and mantle rock is generally intact. The main body of the rock is carbonate-serpentine. Nesquehonite and dypingite are rare minerals and have first been observed in relation to kimberlites. The minerals were found in the bedrock outcrop of the Obnazhennaya pipe as white crusts up to 5 mm thick scattered over an area of a few tens of square meters. To identify and study the crusts we used the following methods: powder X-ray diffraction, electron microscopy, and Raman scattering spectroscopy. A comprehensive study suggests that the main minerals of these epigenetic formations are hydrated carbonates: nesquehonite MgCO3squ3H2O and dypingite Mg5(CO3)4(OH)2squ5H2O. Also, Raman scattering spectroscopy revealed a small proportion of hydromagnesite Mg5(CO3)4(OH)2squ4H2O. Hydrated magnesium carbonate minerals we found make a significant contribution to the collection of kimberlites. They are epigenetic in nature, with their origin being related to weathering of silicates, in particular serpentine. Mechanisms of carbonate formation appear to be close to that suggested by Wilson et. al., 2009, with CO2 being trapped from the atmosphere to form nesquehonite. In the case of the Obnazhennaya pipe, mineral solutions form when rainwater filters through the talus at the top of the outcrop. They are enriched in Mg from minerals and trap CO2 from the atmosphere. After filtering, solutions reach the vertical wall of kimberlite breccia where modern precipitation of nesquehonite upon evaporation occurs. Further, dypingite and hydromagnesite form via decomposition of nesquehonite. A lip extending over the rock wall significantly contributes to the development and stability of nesquehonite and dypingite aggregates. Crusts of nesquehonite and dypingite are not found on rock outcrops without lips at the top. Thus, despite the fact that intrusion of the kimberlite pipe occurred during the Jurassic (Zaitsev, Smelov, 2010), formation of nesquehonite and dypingite in association with kimberlite rocks continues in the modern time due to favorable environmental factors, first of all, a unique natural outcrop of kimberlite.
DS201608-1447
2016
Ugapeva, S.S.Ugapeva, S.S., Pavlushin, A.D., Goryainov, S.V., Afanasiev, V.P., Poikilenko, N.P.Comparative characteristics of diamonds with olivine inclusions from the Ebelyakh placer and kimberlite pipes of the Yakutian Diamondiferous province.Doklady Earth Sciences, Vol. 468, 1, pp. 473-477.RussiaDeposit - Mir, Aykhal, Udachnaya, XXII Congress

Abstract: The results of morphological examination and the character of the structural orientation and estimation of residual pressure calculated from spectra of combination dispersion in olivine inclusions within diamonds of the Ebelyakh placer and kimberlite pipes of the Yakutian Diamondiferous Province are presented. The data analysis aimed at revealing indications of similarity and/or differences between diamonds from the pipes and the placer. Differences in the structural orientation and spectra of combination dispersion of the inclusions of olivine in dodecahedroids of placers of the northeastern part of the Siberian Platform support the assumption of their non-kimberlite nature.
DS201907-1559
2019
Ugapeva, S.S.Logvinova, A.M., Shatskiy, A., Wirth, R., Tomilenko, A.A., Ugapeva, S.S., Sobolev, N.V.Carbonatite melt in type Ia gem diamond.Lithos, in press available, 17p.Russiadeposit - Sytykanskaya

Abstract: Monocrystalline type Ia diamonds with octahedral growth morphology prevail among lithospheric diamonds, including precious stones. Unlike less common ‘fibrous’ diamonds that grew from alkali-rich carbonate-bearing melts and fluids, the growth medium of ‘monocrystalline’ type Ia diamonds remains debatable. Here we report the first finding of an optically visible (~30?µm in size) carbonate inclusion in the center of a gem type Ia octahedral diamond from the Sytykanskaya kimberlite pipe, Yakutia. We found that the inclusion consists of submicron size carbonate phases represented by K2Ca(CO3)2 bütschliite (~15?vol%), Na2Mg(CO3)2 eitelite (~5?vol%), and dolomite (~80?vol%). Although neither bütschliite nor eitelite can coexist with dolomite under mantle P-T conditions, these phases readily appear all together in the quenched products of carbonatite melt under mantle pressures. Thus, at the moment of capture, the inclusion material was a carbonatite melt with the following composition 10(K0.75Na0.25)2CO3·90(Ca0.57Mg0.43)CO3. The content of alkali carbonates at the level of 10?mol% indicates that the melt was formed at a temperature of =1300?°C. The high K/Na and Ca/(Ca?+?Mg) ratios in this melt indicate its derivation by partial melting of recycled marine sediments (pelites). Considering an age of the last subduction event beneath the Siberian craton, our new finding implies that subducting slabs drag carbonated material of the continental crust beneath ancient cratons, where it experiences partial melting to form a potassic dolomitic melt responsible for the formation of most diamonds, since the Late Archean.
DS201909-2060
2019
Ugapeva, S.S.Logvinova, A.M., Shatskiy, A., Wirth, R., Tomilenko, A.A., Ugapeva, S.S., Sobolev, N.V.Carbonatite melt in type Ia gem diamond. Lithos, Vol. 342-343, pp. 463-467.Russiadeposit - Sytykanskaya

Abstract: Monocrystalline type Ia diamonds with octahedral growth morphology prevail among lithospheric diamonds, including precious stones. Unlike less common ‘fibrous’ diamonds that grew from alkali-rich carbonate-bearing melts and fluids, the growth medium of ‘monocrystalline’ type Ia diamonds remains debatable. Here we report the first finding of an optically visible (~30?µm in size) carbonate inclusion in the center of a gem type Ia octahedral diamond from the Sytykanskaya kimberlite pipe, Yakutia. We found that the inclusion consists of submicron size carbonate phases represented by K2Ca(CO3)2 bütschliite (~15?vol%), Na2Mg(CO3)2 eitelite (~5?vol%), and dolomite (~80?vol%). Although neither bütschliite nor eitelite can coexist with dolomite under mantle P-T conditions, these phases readily appear all together in the quenched products of carbonatite melt under mantle pressures. Thus, at the moment of capture, the inclusion material was a carbonatite melt with the following composition 10(K0.75Na0.25)2CO3·90(Ca0.57Mg0.43)CO3. The content of alkali carbonates at the level of 10?mol% indicates that the melt was formed at a temperature of =1300?°C. The high K/Na and Ca/(Ca?+?Mg) ratios in this melt indicate its derivation by partial melting of recycled marine sediments (pelites). Considering an age of the last subduction event beneath the Siberian craton, our new finding implies that subducting slabs drag carbonated material of the continental crust beneath ancient cratons, where it experiences partial melting to form a potassic dolomitic melt responsible for the formation of most diamonds, since the Late Archean.
DS201606-1124
2016
Uggerhoj, U.I.Uggerhoj, U.I., Mikkelsen, R.E., Faye, J.Earth's core is two and half years younger than its crust.European Journal of Physics, Vol. 37, 3, 7p.MantleCore
DS1996-0769
1996
Uglov, B.D.Komarova, O.I., Mirlin, Ye. G., Uglov, B.D.Tectonospheric asymmetry of the Mid-Atlantic Ridge within the Angola Brasil geotraverse zone.Doklady Academy of Sciences, Vol. 333, pp. 8-13.Angola, BrazilMorphostructure, Tectonics
DS1920-0050
1920
Uglow, W.L.Uglow, W.L.Possibility for Platinum in Western CanadaThe Canadian Institute of Mining, Metallurgy and Petroleum (CIM) Transactions, Vol. 23, PP. 374-390.Canada, British ColumbiaBlank
DS201806-1210
2018
Ugolkov, V.L.Babushkina, M.S., Ugolkov, V.L., Marin, Yu.B., Nikitina, L.P., Goncharov, A.G.Hydrogen and carbon groups in the structures of rock forming minerals of rocks of the lithospheric mantle: FTIR and STA + QMS data. Lherzolites, peridotitesDoklady Earth Sciences, Vol. 479, 2, pp. 456-459.Russia, Siberiadeposit - Udachnaya

Abstract: Using IR-Fourier spectrometry (FTIR) and simultaneous thermal analysis combined with quadrupole mass spectrometry of thermal decomposition products (STA + QMS), olivines and clinopyroxene from xenolites of spinel and garnet lherzolites contained in kimberlites and alkaline basalts were studied to confirm the occurrence of hydrogen and carbon within the structure of the minerals, as well as to specify the forms of H and C. The presence of hydroxyl ions (OH-) and molecules of crystal hydrate water (H2Ocryst) along with CO2, CH, CH2, and CH3 groups was detected, which remained within the structures of mantle minerals up to 1300°C (by the data of both techniques). The total water (OH-and H2Ocryst) was the prevailing component of the C-O-H system.
DS202101-0022
2020
Uher, P.Kropac, K., Dolnicek, Z., Uher, P., Burianek, D., Safai, A., Urubek, T.Zirconian-niobian titanite and associated Zr-, Nb-, REE-rich accessory minerals: products of hydrothermal overprint of leucocratic teschenites ( Sileasian Unit, outer western Carpathians, Czech Republic).Geologica Carpathica ** Eng, Vol. 71, 4, pp. 343-360. pdfEurope, Czech Republicalkaline rocks

Abstract: Sills of hydrothermally altered alkaline magmatic rock (teschenite) of Lower Cretaceous age at the Certák and Repište sites in the Silesian Unit (Flysch Belt of the Outer Western Carpathians, Czech Republic) host leucocratic dykes and nests which contain accessory minerals enriched in Zr, Nb and REE: Zr-, Nb-rich titanite, zircon, gittinsite, pyrochlore, monazite, REE-rich apatite, epidote, and vesuvianite. Titanite forms wedge-shaped crystals or irregular aggregates enclosed in the analcime groundmass or overgrowths on Zr-rich ferropargasite and taramite or Zr-rich aegirine-augite to aegirine. Titanite crystals show oscillatory or irregular patchy to sector zoning and contain up to 17.7 wt. % ZrO2 and 19.6 wt. % Nb2O5, and =1.1 wt. % REE2O3. High-field-strength elements (HFSE) are incorporated into the structure of the studied titanite predominantly by substitutions: (i) [6]Ti4+???[6]Zr4+; (ii) [6]Ti4+?+?[6]Al3+???[6]Zr4+?+?[6]Fe3+; and (iii) [6]2Ti4+???[6]Nb5+?+?[6](Al, Fe)3+. Magmatic fractional crystallization, high-temperature hydrothermal autometasomatic overprint and low-temperature hydrothermal alterations resulted in the formation of the HFSE-rich mineral assemblages within the leucocratic teschenites. Autometamorphic processes caused by high-temperature hypersaline aqueous solutions (salinity ~50 wt. %, ~390-510 °C), which were released from the HFSE-enriched residual melt, played a major role in the crystallization of Zr-, Nb-, and REE-rich minerals. The mobilization of HFSE could have occurred either by their sequestration into a fluid phase exsolved from the crystallizing melt or by superimposed alteration processes. The distinctive positive Eu anomaly (EuCN/Eu*?=?1.85) of leucocratic dykes infers possible mixing of Eu2+-bearing magmatic fluids with more oxidized fluids.
DS1910-0220
1911
Uhl, G.Uhl, G.Deutsch Suedwestafrika. Bielefeld:Velhagen Und Klasing, 34P.Southwest Africa, NamibiaDiamonds, Occurrences, Kimberley
DS1992-1569
1992
Uhlein, A.Trompette, R., Uhlein, A., Silva, M.E., Karmann, I.The Brasiliano Sao Francisco Craton revisited (central Brasil)Journal of South American Earth Science, Vol. 6, No. 1-2, pp. 49-57BrazilCraton, Proterozoic fold belt
DS1995-0009
1995
Uhlein, A.Affaton, P., Trompette, R., Uhlein, A., Boudzoumou, F.The Panafrican Brasiliano Aracuai West Congo fold belt in the framework Of western Gondwana aggregation 600MaGeological Society Africa 10th. Conference Oct. Nairobi, p. 20. AbstractWest Africa, BrazilTectonics, Rodinia Supercontinent
DS1999-0754
1999
Uhlein, A.Uhlein, A., Trompette, R.R., Alvarenga, C.J.S.Neoproterozoic glacial and gravitational sedimentation on a continental rifted margin: Jequitaf-Macaubas ...Journal of African Earth Sciences, Vol. 12, No. 5, Sept. pp. 435-51.Brazil, Minas GeraisTectonics, Geomorphology
DS2003-0650
2003
Uhlik, F.Jehlicka, J., Svatos, A., Frank, O., Uhlik, F.Evidence for fullerenes in solid bitumen from pillow lavas of Proterozoic age fromGeochimica et Cosmochimica Acta, Vol. 67, 8, pp. 1495-1506.Czech RepublicFullerenes
DS200412-0909
2003
Uhlik, F.Jehlicka, J., Svatos, A., Frank, O., Uhlik, F.Evidence for fullerenes in solid bitumen from pillow lavas of Proterozoic age from Mikov ( Bohemian Massif, Czech Republic).Geochimica et Cosmochimica Acta, Vol. 67, 8, pp. 1495-1506.Europe, Czech RepublicFullerenes
DS201504-0197
2012
Uhlmann, N.Firsching, M., Muhlbauer, J., Nachtrab, F., Uhlmann, N.Detection of enclosed diamonds using dual energy X-ray imaging.18th. World Conference on Nondestructive Testing held Durban SA, 7p.TechnologyDiamond recovery
DS1998-0236
1998
Uimin, S.G.Chaschukhin, I.S., Votyakov, S.L., Uimin, S.G.Oxygen thermometry and barometry in chromite bearing ultramafic rocks:example of ultramafic Massifs...Geochemistry International, Vol. 36, No. 9, Sept. 1, pp. 783-Russia, UralsUltramafics - oxidation, Mineralizing fluids
DS1993-0675
1993
ujii, T.Hirayama, Y., ujii, T.The melting relation system, iron and carbon at high pressure and its bearing on the early stage of the earth.Geophysical Research Letters, Vol. 20, No. 19, October 8, pp. 2095-2098.MantleCarbon
DS1995-0857
1995
Ujike, O.Ito, E., Morooka, K., Ujike, O., Katsura, T.Reactions between molten iron and silicate melts at high pressure:implications for chemical evolution coreJournal of Geophysical Research, Vol. 100, No. B4, April 10, pp. 5901-10.MantleCore, Geochemistry -earth
DS2003-0617
2003
UKIndependent, London, UKWhy diamonds are a crook's best friend.....Independent News, June 16, 3p.GlobalNews item, Diamond robbery
DS1986-0691
1986
Ukanov, A.V.Ryabchikov, I.D., Ukanov, A.V., Ishii, T.Redox equilibration temperatures in upper mantle ultrabasites in the YakutiakimberliteprovinceGeochemistry International, Vol. 23, No. 2, pp. 38-50RussiaMantle
DS1986-0824
1986
UKanov, A.V.UKanov, A.V., Ustinov, V.I. eta l.Low temperature of Yakutian kimberlite serpentinization from isotope oxygen data.(Russian)Doklady Academy of Sciences Akademy Nauk SSSR, (Russian), Vol. 288, No. 2, pp. 466-469YakutiaGeochronology
DS1997-1179
1997
UKen, R.UKen, R., Watkeys, M.K.Diapirism initiated by the Bushveld Complex, South AfricaGeology, Vol. 25, No. 8, August pp. 723-726South AfricaDiapir, layered intrusion, structure, Deposit - Bushveld
DS1997-1180
1997
UKen, R.UKen, R., Watkeys, M.K.An interpretation of mafic dyke swarms and their relationship with major mafic magmatic events ...South African Journal of Geology, Vol. 100, 4, Dec. pp. 341-348.MantleKaapvaal Craton, Limpopo Belt, Dike swarms
DS1998-0181
1998
Uken, R.Buick, I.S., Uken, R., Gibson, R.L., Wallmach, T.High delta 13 C Paleoproterozoic carbonates from the Transvaal South AfricaGeology, Vol. 26, No. 10, Oct. pp. 875-8South AfricaKaapvaal Craton, Geochronology, Carbon
DS1998-1570
1998
Uken, R.Watkeys, M.K., Uken, R.Diking events in the Kaapvaal Craton from Archean to Gondwana break-upJournal of African Earth Sciences, Vol. 27, 1A, p. 206. AbstractSouth AfricaDykes, Magmatism
DS200412-0653
2003
Uken, R.Gerya, T.V., Uken, R., Reinhardt, J., Watkeys, M.K., Maresch, W.V., Clarke, B.M.Cold fingers in a hot magma: numerical modeling of country rock diapirs in the Bushveld Complex, South Africa.Geology, Vol. 31, 9, pp. 753-6.Africa, South AfricaDiapirism, magmatism, plumes, subduction zones
DS201809-1993
2018
Uken, R.Barnett, W., Stubley, M., Hetman, C., Uken, R., Hrkac, C., McCandless, T.Kelvin and Faraday kimberlite emplacement geometries and implications for subterranean magmatic processes.Mineralogy and Petrology, doi.org/10.1007/ s00710-018-0621-8 16p.Canada, Northwest Territoriesdeposit - Kelvin, Faraday

Abstract: The Kennady North Project kimberlites (Northwest Territories of Canada) comprises multiple shallow dipping dykes and several volcaniclastic bodies that have an unusual shallow plunging geometry and complex "pipe" shapes that are termed chonoliths. The detailed exploration of the entire system provides exceptional evidence for subterranean volcanic conduit growth processes. The possible processes leading to the development of the kimberlite bodies are discussed, with emphasis on the importance of the subsurface intrusive system geometry and the local stress tensor. Emplacement into a locally compressive stress regime (i.e. s1 and s2 inclined at a low angle to surface) could change the kimberlite emplacement geometries to that observed at Kennady North. Models are proposed for the development of the chonoliths, to emphasize aspects of the growth of kimberlite systems that are not well understood. The conclusions challenge or evolve current emplacement models and should influence kimberlite exploration and resource definition assumptions.
DS2001-0597
2001
UkhanovKhisina, N.R., Wirth, R., Langer, K., Andrut, UkhanovMicrostructure of experimentally oxidized olivine from a mantle nodule 1. modes of Fe3 and OH occurrence.Geochemistry International, Vol. 39, No. 4, pp. 327-35.GlobalPetrology - experimental, Nodule
DS1960-0102
1960
Ukhanov, A.V.Ukhanov, A.V.An Occurrence of Unaltered Olivine-monticellite Kimberlite In the Basin of the River Anabar.Niiga, Info. Bulletin., No. 21, PP. 34-36.RussiaBlank
DS1960-1045
1968
Ukhanov, A.V.Ukhanov, A.V.Nickel in Ultrabasic Inclusions from the Kimberlite Pipes Of Northern Yakutia.Geochemistry International, Vol. 5, PP. 1190-1198.RussiaBlank
DS1970-0204
1970
Ukhanov, A.V.Ukhanov, A.V.Geochemistry of Chromium in the Upper Mantle According to The Results of Investigation of Ultramafic Intrusions in a Kimberlite Pipe.Geochemistry International, Vol. 7, PP. 746-757.RussiaBlank
DS1970-0438
1971
Ukhanov, A.V.Ukhanov, A.V., Mochalova, YU.Z.High Temperature Emanation Study of Heat-induced Transformations in Enstatite from a Kimberlite Pipe.Doklady Academy of Science USSR, Earth Science Section., Vol. 198, No. 1-6, PP. 157-158.RussiaBlank
DS1982-0611
1982
Ukhanov, A.V.Ukhanov, A.V., Borodaeva, T.YU., Borodaev, YU.Composition and Zonality of Olivines from the Udachnaya Pipe As a Refl Ection of Path of the Kimberlite Magma Evolution.Geochemistry International (Geokhimiya)., No. 5, MAY PP. 664-676.RussiaKimberlite Genesis
DS1982-0612
1982
Ukhanov, A.V.Ukhanov, A.V., Sobornov, O.P., et al.Thorium and Uranium Contents in Kimberlites of Siberia and Africa Based on the Results of New Gamma Spectrometric Determinations.Geochemistry International (Geokhimiya)., No. 8, AUGUST, PP. 1204-1210.Russia, South AfricaMineral Chemistry
DS1983-0611
1983
Ukhanov, A.V.Ukhanov, A.V., Devirts, A.L.Meteoritic Origin of Water Serpentinizing Yakutian Kimberlites.Doklady Academy of Sciences AKAD. NAUK SSSR., Vol. 283, No. 3, PP. 706-709.RussiaBlank
DS1985-0575
1985
Ukhanov, A.V.Ryabchik, I.D., Ukhanov, A.V., Ishii, T.Redox equilibration temperatures in the Ultramafic Rocks from the Upper Mantle of the Yakutian Kimberlite Province.Geochimiya., No. 8, AUGUST PP. 1110-1123.Russia, YakutiaPetrology
DS1987-0756
1987
UKhanov, A.V.UKhanov, A.V., Ustinov, V.I., Devirts, A.L., Grinenko, V.A.Low serpentinization temperatures of Yakutian kimberlites, as estimated from dat a on oxygen isotopesDoklady Academy of Science USSR, Earth Science Section, Vol. 288, No. 1-6, pp. 163-166YakutiaBlank
DS1987-0757
1987
UKhanov, A.V.UKhanov, A.V., Vlasova, E.V., Devirts, A.L., Ustinov, V.I.IR spectra and isotope composition of hydrogen and oxygen in micas From kimberlites of Yakutia.(Russian)Zap. Vses. Mineral. O. Va, (Russian), Vol. 116, No. 3, pp. 334-341MantleGeochronology, Isotope
DS1987-0759
1987
Ukhanov, A.V.Ustinov, V.I., Ukhanov, A.V., Grinenko, V.A., Gavrilov, E.Y.Isotopic composition of oxygen of eclogites from kimberlite pipes Udachnaya and Obnazhennaya. (Technical note). (in Russian)Geochemistry International (Geokhimiya), (Russian), No. 11, November pp. 1637-1641RussiaBlank
DS1988-0716
1988
UKhanov, A.V.UKhanov, A.V., Ryabchikov, I.D., Kharkiv, A.D.The lithospheric mantle of the Yakutia kimberlite province.(Russian)Izd. Nauka Moscow, (Russian), 286pYakutiaMantle, Yakutia province
DS1989-0466
1989
Ukhanov, A.V.Galimov, E.M., Ukhanov, A.V.Nature of carbonate component of kimberlites.(Russian)Geochemistry International (Geokhimiya), (Russian), No. 3, March pp. 337-348RussiaGeochemistry, Carbonate mineralogy
DS1989-0467
1989
Ukhanov, A.V.Galimov, E.M., Ukhanov, A.V.The carbonate component in kimberlitesGeochemistry International, Vol. 26, No. 10, pp. 14-23RussiaGeochronology, Carbonate-kimberlite
DS1989-1533
1989
Ukhanov, A.V.Ustinov, V.I., Ukhanov, A.V., Grinenko, V.A.Delta 18O in an olivine-chrome spinelid assemblageGeochemistry International, Vol. 26, No. 9, pp. 128-132RussiaHypabasites, Kimberlite magma
DS1991-1760
1991
UKhanov, A.V.UKhanov, A.V., Kharkiv, A.D.Upper mantle composition beneath Yakutian kimberlite provinceProceedings of Fifth International Kimberlite Conference held Araxa June 1991, Servico Geologico do Brasil (CPRM) Special, pp. 567-568YakutiaMineralogy, Geothermometry
DS1993-0401
1993
Ukhanov, A.V.Egorov, L.S., Melnik, A.Y., Ukhanov, A.V.On 1st discovered kimberlite with syngenetic shliren of calcitic carbonatite from a dike in Antarktida.(Russian)Doklady Academy of Sciences Akademy Nauk SSSR, (Russian), Vol. 328, No. 2, January pp. 230-233GlobalCarbonatite, Calcite
DS1993-1270
1993
Ukhanov, A.V.Pustovetsov, A.A., Mitina, Ye.A., Ukhanov, A.V., Nikolskaya, N.Ye.In homogeneity in accessory chrome spinel as a geothermometerGeochemistry International, Vol. 30, No. 5, pp. 31-41.Russia, Urals, RussiaHarzburgite, Kemirsay intrusion
DS1994-1818
1994
Ukhanov, A.V.Ustinov, V.I., Ukhanov, A.V., Gavrilov, E.V.On the oxygen isotopic composition of mineral assemblages at different stages of kimberlite formation. (Russian)Geochemistry International (Geokhimiya), (Russian), No. 1, pp. 144-148.RussiaGeochronology, Kimberlite mineralogy
DS1994-1819
1994
Ukhanov, A.V.Ustinov, V.I., Ukhanov, A.V., Gavrilov, Ye. Ya.Oxygen isotope composition of the mineral assemblages in the stages of emplacement of kimberlites.Geochemistry International, Vol. 31, No. 8, pp. 152-156.RussiaGeochronology, mineralogy, Kimberlites
DS1995-0987
1995
Ukhanov, A.V.Kogarko, L.N., Ukhanov, A.V., Nikolskaya, N.E.New dat a on the content of platinum group elements (PGE) in the ijolite carbonatite association Guli and Kigda intrusions.Geochemistry International, Vol. 32, No. 6, pp. 144-152.Russia, SiberiaIjolite, Carbonatite, Maymecha-Kotuy Province
DS1995-2103
1995
Ukhanov, A.V.Yegorov, L.S., Melnik, A.Yu., Ukhanov, A.V.The first Antarctic occurrence of a dike kimberlite containing syngenetic calcite carbonatite schlieren.Doklady Academy of Sciences, Vol. 329, No. 2, Jan. pp. 104-108.AntarcticaKimberlite, Dike
DS1997-1040
1997
Ukhanov, A.V.Shubina, N.A., Ukhanov, A.V., Genshaft, Yu.S., KolesovTrace and major elements in peridotites beneath northwestern Spitsbergen: acontribution to mantle...Geochemistry International, Vol. 35, No. 1, pp. 17-31.GlobalMantle heterogeneity, Peridotites
DS2002-1526
2002
Ukhanov, A.V.Soloveva, L.V., Kostrovitskii, S.I., Ukhanov, A.V., Suvorova, L.F., AlymovaMegacrystalline orthopyroxenite with graphite from the Udachanaya pipe, YakutiaDoklady, Vol.385,June-July, pp. 589-92.Russia, YakutiaMineralogy, Deposit - Udachnaya
DS200512-0961
2005
Ukhanov, A.V.Serov, V.P., Kharkiv, A.D., Ustinov, V.I., Ukhanov, A.V.The Sobolev kimberlite pipe: structure and composition. YakutiaRussian Geology and Geophysics, Vol. 46, 2, pp. 188-198.Russia, YakutiaMineralogy - Sobolev
DS201212-0740
2012
Ukhanov, A.V.Ukhanov, A.V., Khachatryan, G.K.Diamonds from the Poiskovaya, Zapolyarnaya and Leningrad kimberlite pipes, northern Yakutia: correlation of carbon isotopic composition and nitrogen content as an indicator of fluid diamond formation.Geology of Ore Deposits, Vol. 53, 8, pp. 783-791.Russia, YakutiaDiamond morphology, geochemistry
DS201903-0537
2018
Ukhova, N.N.Pashkova, G.V., Panteeva, S.V., Ukhova, N.N., Chubarov, V.M., Finkelshtein, A.L., Ivanov, A.V., Asavin, A.M.Major and trace elements in meimechites - rare occurring volcanic rocks: developing optimal analytical strategy.Geochemistry: Exploration, Environment, Analysis, 10.1144/geochem2017-099 11p. Canada, Chinameimechites

Abstract: The determination of the chemical composition of meimechites which are unique and rarely occurring ultra-high MgO igneous rocks can be complicated due to their porphyric structure, the presence of acid-insoluble minerals, and wide variation of major and trace element contents. In the present study the optimal analytical strategy based on a combination of X-ray fluorescence (XRF) and inductively coupled plasma mass spectrometry (ICP-MS) methods was suggested for the determination of the elemental composition of meimechites. The preparation of glass beads using a lithium tetraborate and metaborate mixture proved to be suitable for the XRF determination of major oxides. A comparative study of the sample decomposition procedures for the determination of trace elements by ICP-MS clearly showed that fusion with lithium metaborate was the most appropriate sample preparation technique for complete digestion of meimechites. The open beaker HF-HNO3-HClO4 acid digestion was insufficient because the results for Nb, Ta, V, Zr, Cr and Hf were underestimated by 20-80% compared to those determined using the fusion method due to the presence in the rock samples of acid-resistant accessory minerals. It is shown that using analytical data from acid digestion may lead to erroneous interpretation of geochemical data.
DS201908-1801
2019
Ukhova, N.N.Paskova, G.V., Panteeva, S.V., Ukhova, N.N., Chubarov, V.M., Finkelstein, A.L., Ivanov, A.I., Asavin, A.M.Major and trace elements in meimechites - rarely occurring volcanic rocks: developing optimal analytical strategy.Geochemistry: Exploration, Environment, Analysis, Vol. 19, pp. 233-243. pdfMantlemeimechites

Abstract: The determination of the chemical composition of meimechites which are unique and rarely occurring ultra-high MgO igneous rocks can be complicated due to their porphyric structure, the presence of acid-insoluble minerals, and wide variation of major and trace element contents. In the present study the optimal analytical strategy based on a combination of X-ray fluorescence (XRF) and inductively coupled plasma mass spectrometry (ICP-MS) methods was suggested for the determination of the elemental composition of meimechites. The preparation of glass beads using a lithium tetraborate and metaborate mixture proved to be suitable for the XRF determination of major oxides. A comparative study of the sample decomposition procedures for the determination of trace elements by ICP-MS clearly showed that fusion with lithium metaborate was the most appropriate sample preparation technique for complete digestion of meimechites. The open beaker HF-HNO3-HClO4 acid digestion was insufficient because the results for Nb, Ta, V, Zr, Cr and Hf were underestimated by 20-80% compared to those determined using the fusion method due to the presence in the rock samples of acid-resistant accessory minerals. It is shown that using analytical data from acid digestion may lead to erroneous interpretation of geochemical data.
DS201909-2072
2019
Ukhova, N.N.Pashkova, G.V., Panteeva, S., Ukhova, N.N., Chubarov, V.M., Finkelshtein, A.L., Ivanov, A.V., Asavin, A.M.Major and trace elements in meimechites - rarely occurring volcanic rocks: developing optimal analytical strategy.Geochemistry: Exploration, Environment, Analysis, Vol. 19, pp, 233-243.Russia, Canada, Chinameimechites

Abstract: The determination of the chemical composition of meimechites which are unique and rarely occurring ultra-high MgO igneous rocks can be complicated due to their porphyric structure, the presence of acid-insoluble minerals, and wide variation of major and trace element contents. In the present study the optimal analytical strategy based on a combination of X-ray fluorescence (XRF) and inductively coupled plasma mass spectrometry (ICP-MS) methods was suggested for the determination of the elemental composition of meimechites. The preparation of glass beads using a lithium tetraborate and metaborate mixture proved to be suitable for the XRF determination of major oxides. A comparative study of the sample decomposition procedures for the determination of trace elements by ICP-MS clearly showed that fusion with lithium metaborate was the most appropriate sample preparation technique for complete digestion of meimechites. The open beaker HF-HNO3-HClO4 acid digestion was insufficient because the results for Nb, Ta, V, Zr, Cr and Hf were underestimated by 20-80% compared to those determined using the fusion method due to the presence in the rock samples of acid-resistant accessory minerals. It is shown that using analytical data from acid digestion may lead to erroneous interpretation of geochemical data.
DS1986-0692
1986
Ukranov, A.V.Ryabchikov, I.D., Ukranov, A.V., Ishii, T.Redoc equilibration temperatures in upper mantle ultrabasites in the YakutiakimberliteprovinceGeochemistry International, Vol.23, No. 2, pp. 38-50RussiaPetrology, Ultrabasites
DS1992-0220
1992
Ulbrich, H.H.G.J.Carneiro, M.A., Ulbrich, H.H.G.J., Kawashita, K.Proterozoic crustal evolution at the southern margin of the Amazonian craton in the state of Mato Grosso, Brasil: evidence from rubidium-strontium (Rb-Sr) and K-Ar dataPrecambrian Research, Vol. 59, No. 3-4, December pp. 263-282BrazilTectonics, Geochronology
DS1991-0976
1991
Ulbrich, M.N.Leonardos, O.H., Ulbrich, M.N., Gaspar, J.C.The Mat a da Corda volcanic rocksFifth International Kimberlite Conferences Field Excursion Guidebook, Servico Geologico do Brasil (CPRM) Special, pp. 65-74BrazilGeology, Volcanics
DS1987-0405
1987
Ulbrich, M.N.C.Leonardos, O.H., Ulbrich, M.N.C.Lamproitos de Presidente Olegano, Minas Gerais.(in Portugese)39th. Annual Meeting Brazilian Soc. For Advancement Of Science, Abstract (ref. from Mitchell)GlobalBlank
DS1991-1761
1991
Ulbrich, M.N.C.Ulbrich, M.N.C., Leonardos, O.H.The ultrabasic potassic rocks of Presidente Olegario, Serra da Mat a daCorda, Minas Gerais, BrasilProceedings of Fifth International Kimberlite Conference held Araxa June 1991, Servico Geologico do Brasil (CPRM) Special, pp. 437-439BrazilMineral chemistry, analyses, Wadeite, Kamafugite, lamproite
DS1994-1808
1994
Ulbrich, M.N.C.Ulbrich, M.N.C., Maringolo, V., Vlach, S.R.F.Xenocrysts in mafic dikes from the Fernando de Noronha ArchipelagoInternational Symposium Upper Mantle, Aug. 14-19, 1994, Extended abstracts pp. 36-38.BrazilAlkaline rocks
DS1998-0929
1998
Ulfbeck, D.Manatschal, G., Ulfbeck, D., Van Gool. J.Change from thrusting to syncollisional extension at a mid-crustal level:an example from the PaleoproterozoicCanadian Journal of Earth Sciences, Vol. 35, No. 7, July pp. 802-19.GreenlandOrogen - Nagssugtoquidian, Tectonics
DS2003-0117
2003
Ulfbeck, D.Bizzaro, M., Baker, J.A., Haack, H., Ulfbeck, D., Rosing, M.Early history of Earth's crust mantle system inferred from hafnium isotopes inNature, No. 6926, Feb. 27, pp. 931-2.MantleGeochronology
DS2000-0962
2000
Ulianov, A.G.Ulianov, A.G., Putintseva, E.V.Deep seated mineral association from kimberlites of the Kaavi district central Finland.IN RUSSIAN.Proceedings Russ. Min. Soc. *RUSS, Vol. 129, No. 2, pp. 10-28.FinlandKimberlite mineralogy, Deposit - Kaavi district
DS200612-0030
2006
Ulianov, A.G.Antonov, A.V., Ulianov, A.G.Mantle xenoliths from Kostomuksha lamproites/orangeites, NW Russia.Geochimica et Cosmochimica Acta, Vol. 70, 18, p. 18, abstract only.RussiaOangeites
DS200512-0523
2005
Ullah, K.Khattak, N.U., Akram, M., Ullah, K., Qureshi,L.E.Recognition of emplacement time of Jambil carbonatite complex from NW Pakistan: constraints from fission track dating of apatite using age standard approach.GAC Annual Meeting Halifax May 15-19, Abstract 1p.PakistanPeshawar Plain alkaline rocks, geochronology
DS200512-0524
2005
Ullah, K.Khattak, N.U., Qureshi, A.A., Akram, M., Ullah, K., Azhar, M., Asif Khan, M.Unroofing history of the Jambil and Jawar carbonatite complexes from NW Pakistan: constraints from fission track dating of apatite.Journal of Asian Earth Sciences, Vol. 25, 4, July pp. 643-652.Asia, PakistanCarbonatite, geochronology
DS1994-1809
1994
Ullbrich, J.Ullbrich, J.Canadian diamond rush is Klondike of the 1990'sInternational California Mining Journal, March p. 9-12.Northwest TerritoriesNews item, Background layman's story
DS201712-2676
2017
Ullmann, C.V.Broom-Fendley, S., Wall, F., Spiro, B., Ullmann, C.V.Deducing the source and composition of rare earth mineralising fluids in carbonatites: insights from isotopic ( C,O,87Sr/86SR) dat a from Kangankunde, Malawi.Contributions to Mineralogy and Petrology, Vol. 172, 96Africa, Malawicarbonatite

Abstract: Carbonatites host some of the largest and highest grade rare earth element (REE) deposits but the composition and source of their REE-mineralising fluids remains enigmatic. Using C, O and 87Sr/86Sr isotope data together with major and trace element compositions for the REE-rich Kangankunde carbonatite (Malawi), we show that the commonly observed, dark brown, Fe-rich carbonatite that hosts REE minerals in many carbonatites is decoupled from the REE mineral assemblage. REE-rich ferroan dolomite carbonatites, containing 8-15 wt% REE2O3, comprise assemblages of monazite-(Ce), strontianite and baryte forming hexagonal pseudomorphs after probable burbankite. The 87Sr/86Sr values (0.70302-0.70307) affirm a carbonatitic origin for these pseudomorph-forming fluids. Carbon and oxygen isotope ratios of strontianite, representing the REE mineral assemblage, indicate equilibrium between these assemblages and a carbonatite-derived, deuteric fluid between 250 and 400 °C (d18O + 3 to + 5‰VSMOW and d13C - 3.5 to - 3.2‰VPDB). In contrast, dolomite in the same samples has similar d13C values but much higher d18O, corresponding to increasing degrees of exchange with low-temperature fluids (< 125 °C), causing exsolution of Fe oxides resulting in the dark colour of these rocks. REE-rich quartz rocks, which occur outside of the intrusion, have similar d18O and 87Sr/86Sr to those of the main complex, indicating both are carbonatite-derived and, locally, REE mineralisation can extend up to 1.5 km away from the intrusion. Early, REE-poor apatite-bearing dolomite carbonatite (beforsite: d18O + 7.7 to + 10.3‰ and d13C -5.2 to -6.0‰; 87Sr/86Sr 0.70296-0.70298) is not directly linked with the REE mineralisation.
DS1990-1487
1990
Ullom, B.Ullom, B., Palmer, D.K.Crustal structure in east-central KentuckyEos, Vol. 71, No. 43, October 23, p. 1435 AbstractKentuckyGeophysics -magnetics, gravity, Crust
DS1988-0717
1988
Ullom, B.P.Ullom, B.P., Palmer, D.F.Crustal structure beneath the Cincinnati Arch in South Central Kentucky from magnetic, gravity and seismic dataGeological Society of America (GSA) Abstract Volume, Vol. 20, No. 5, March p. 392. abstractKentuckyBlank
DS1994-1810
1994
Ulman, N.Ulman, N.Fipke's folly pays off in diamondsGem., 1994/95 pp. 30-33.Northwest TerritoriesNews item, Profile of Fipke
DS1970-0912
1974
Ulmer, G.C.Friel, J.J., Ulmer, G.C.Oxygen Fugacity Geothermometry of the Oka CarbonatiteAmerican MINERALOGIST., Vol. 59, PP. 314-318.Canada, QuebecRelated Rocks, Mineralogy
DS1981-0432
1981
Ulmer, G.C.Woermann, E., Rosenhauer, M., Ulmer, G.C.A Model for the Stability of Diamond and Graphite in the Earth's Mantle.Geocongress '81 Open Session., ABSTRACT VOLUME, PP. 74-75.South AfricaDiamond Genesis
DS1985-0238
1985
Ulmer, G.C.Gold, D.P., Deines, P., Ulmer, G.C., Moats, M.A., Weiss, D.Types and Tectonic Settings of Diamond Bearing LamprophyresGeological Association of Canada (GAC)., Vol. 10, P. A21, (abstract.).GlobalReview
DS1985-0459
1985
Ulmer, G.C.Moats, M.A., Weiss, D.A., Ulmer, G.C.Evaluating the Redox State of Ilmenite Bearing XenolithsEos, Vol. 66, No. 18, APRIL 30TH. P. 393. (abstract.).GlobalExperimental Petrology
DS1985-0689
1985
Ulmer, G.C.Ulmer, G.C., Moats, M.A., Weiss, D.A.Oxygen Fugacity, Carbon and the Mantle Redox StateEos, Vol. 66, No. 18, APRIL 30TH. P. 393. (abstract.).GlobalExperimental Petrology
DS1985-0718
1985
Ulmer, G.C.Weiss, D.A., Ulmer, G.C., Buntin, T., Moats, M.A.Fluid Inclusions and 10f Data: Group Ii Composite Nodules from San carlos, Arizona.Eos, Vol. 66, No. 18, APRIL 30TH. P. 392. (abstract.).United States, Arizona, Colorado PlateauBlank
DS1987-0758
1987
Ulmer, G.C.Ulmer, G.C., Grandstaff, D.E., Weiss, D., Moats, M.A., et al.The mantle redox state: an unfinished story?Mantle metasomatism and alkaline magmatism, edited E. Mullen Morris and, No. 215, pp. 5-24GlobalModel, IOF.
DS1987-0764
1987
Ulmer, G.C.Virgo, D., Luth, R.W., Moats, M.A., Ulmer, G.C.The redox state of the mantle: evidence from mantle derived ilmenitesGeological Society of America, Vol. 19, No. 7 annual meeting abstracts, p.877. abstracGlobalilmenites
DS1989-1042
1989
Ulmer, G.C.Moats, M.A., Ulmer, G.C.(CCO) and FMQ) oxygen buffer values for upper mantle conditions:Diamond Workshop, International Geological Congress, July 15-16th. editors, pp. 61-64. AbstractGlobalGeothermometry
DS1992-0599
1992
Ulmer, G.C.Grandstaff, D.E., Ulmer, G.C.Fluid inclusions in diamond, equations of state and mantle redoxconditionsEos Transactions, Vol. 73, No. 14, April 7, supplement abstracts p.335MantleDiamond morphology, Mantle redox
DS1998-1496
1998
Ulmer, G.C.Ulmer, G.C., Grandstaff, D., Gobbels, M., Woermann, E.An experimental delineation of the oxygen fugacity of moissanite ( SiC)bearing silicate systems.7th International Kimberlite Conference Abstract, pp. 932-33.GlobalMineral chemistry, Moissanite
DS1998-1588
1998
Ulmer, G.C.Woermann, E., Gobbels, M., Ulmer, G.C., Grandstaff, D.Moissanite and its bearing on the oxygen fugacity of the deeper regimes Of the Earth's upper mantle.7th International Kimberlite Conference Abstract, pp. 958-9.MantleMoissanite, Peridotite xenoliths
DS1999-0755
1999
Ulmer, G.C.Ulmer, G.C., Grandstaff, D.E.Redox stability of moissanite (SIC) and diamond fluid inclusions:implications for the mantle.Geological Association of Canada (GAC) Geological Association of Canada (GAC)/Mineralogical Association of Canada (MAC)., Vol. 24, p. 132. abstractMantleMoissanite
DS200712-1098
2007
Ulmer, G.C.Ulmer, G.C., Woermann, E.Thermodynamic price tags for a wet mantle.Plates, Plumes, and Paradigms, 1p. abstract p. A1046.MantleWadsleyite, redox, water
DS1989-1523
1989
Ulmer, P.Ulmer, P., Trommsdorff, V., Dietrich, V.J.The genesis of Cretaceous basanites from the Calcareous Alps (Austria):experimental, geochemical and fieldconstraintsNew Mexico Bureau of Mines Bulletin., Continental Magmatism Abstract Volume, Held, Bulletin. No. 131, p. 274. AbstractAustriaBasanite
DS1993-1563
1993
Ulmer, P.Sweeney, R.J., Thompson, A.B., Ulmer, P.Phase relations of a natural MARID composition and implications for MARIDgenesis, lithospheric melting and mantle MetasomatismContributions to Mineralogy and Petrology, Vol. 115, No. 2, November pp. 225-241.MantleMetasomatism
DS1998-1057
1998
Ulmer, P.Mysen, B.O., Ulmer, P., Schmidt, M.W.The Upper mantle near convergent plate boundariesReviews in Mineralogy, Vol. 37, pp. 97-138.MantleGeodynamics, Plate tectonics - boundary
DS1998-1497
1998
Ulmer, P.Ulmer, P.Mantle metasomatism: product of material recycling at convergent platemargins.Terra Nova, Abstracts, Vol. 10, suppl. 1, 62. abstractMantleMetasomatism
DS1999-0375
1999
Ulmer, P.Konzett, J., Ulmer, P.The stability of hydrous potassic phases in lherzolitic mantle - an experimental study to 9.5 GPa ...Journal of Petrology, Vol. 40, No. 4, Apr. 1, pp. 629-MantleGeochemistry - bulk composition, Lherzolite
DS2001-1123
2001
Ulmer, P.Stadler, R., Ulmer, P.Phase relations of a serpentine composition between 5 and 14 GPa: significance of clinohumite and phase E.Contributions to Mineralogy and Petrology, Vol. 140, No. 6, pp. 670-79.MantleTransition zone - E as water carriers
DS2001-1124
2001
Ulmer, P.Stalder, R., Ulmer, P., Gunther, D.high pressure fluids in the system MgO SiO2H2 under upper mantle conditionsContributions to Mineralogy and Petrology, Vol. 140, No. 5, pp. 607-18.MantlePressure
DS2001-1171
2001
Ulmer, P.Ulmer, P.Partial melting in the mantle wedge - the role of H2O in the genesis of mantle derived arc related magmas.Physics of the Earth and Planetary Interiors, Vol. 127, No. 1-4, Dec. 1, pp. 215-32.MantleMelting - water, subduction, Subduction - geodynamics, rheology
DS2002-1621
2002
Ulmer, P.Ulmer, P., Sweeney, R.J.Generation and differentiation of group II kimberlites : constraints from a high pressure experimental study to 10 GPa.Geochimica et Cosmochimica Acta, Vol.66,12, June pp. 2139-66.GlobalMineralogy
DS2002-1622
2002
Ulmer, P.Ulmer, P., Sweeney, R.J.Generation and differentiation of Group II kimberlites: constraints from a high pressure experimental study to 10 GPa.Geochimica et Cosmochima Acta, Vol.66, No.12, pp. 2139-53.GlobalPetrology - experimental
DS2003-0333
2003
Ulmer, P.Di Pierro, S., Gnos, E., Grobety, B.H., Armbruster, T., Bernasconi, S.M., Ulmer, P.Rock forming moissanite ( natural a-silicon carbide)American Mineralogist, Vol. 88, pp. 1817-21.Aegean SeaGeochemistry
DS2003-1397
2003
Ulmer, P.Ulmer, P., Sweeney, R.J.Generation and differentiation of Group II kimberlites: constraints from high pressure8 Ikc Www.venuewest.com/8ikc/program.htm, Session 7, POSTER abstractGlobalOrangeites
DS200412-0450
2003
Ulmer, P.Di Pierro, S., Gnos, E., Grobety, B.H., Armbruster, T., Bernasconi, S.M., Ulmer, P.Rock forming moissanite ( natural a-silicon carbide).American Mineralogist, Vol. 88, pp. 1817-21.TechnologyGeochemistry
DS200412-0991
2004
Ulmer, P.Kessel, R., Ulmer, P., Pettke, T., Schmidt, M.W., Thompson, A.B.A novel approach to determine high pressure high temperature fluid and melt compositions using diamond trap experiments.American Mineralogist, Vol. 89, June pp. 1078-1086.TechnologyUHP, freezing approach
DS200412-0992
2004
Ulmer, P.Kessel, R., Ulmer, P., Pettke, T., Schmidt, M.W., Thompson, A.B.Phase relations and second critical endpoint in eclogite H2O at 4-6 GPa and 900-1400C.Lithos, ABSTRACTS only, Vol. 73, p. S56. abstractMantleMineral chemistry
DS200412-0993
2004
Ulmer, P.Kessel, R., Ulmer, P., Pettke, T., Schmidt, M.W., Thompson, A.B.A novel approach to determine high pressure high temperature fluid and melt compositions using diamond trap experiments.American Mineralogist, Vol. 89, 6, pp. 1078-1086.TechnologyPetrology, experimental UHP
DS200412-2021
2003
Ulmer, P.Ulmer, P., Sweeney, R.J.Generation and differentiation of Group II kimberlites: constraints from high pressure experiments 10 GPa.8 IKC Program, Session 7, POSTER abstractTechnologyKimberlite petrogenesis Orangeites
DS200612-0691
2005
Ulmer, P.Kessel, R., Schmidt, M.W., Ulmer,P., Pettke, T.Trace element signature of subduction zone fluids, melts and supercritical liquids at 120-180 km depth.Nature, Vol. 437, pp. 724-MantleSubduction
DS200712-0711
2007
Ulmer, P.Melekhova, E., Schmidt, M.W., Ulmer, P., Pettke, T.The composition of liquids coexisting with Dense Hydrous Magnesium silicates and the second critical endpoint in the MgO SiO2 H2O system.Frontiers in Mineral Sciences 2007, Joint Meeting of Mineralogical societies Held June 26-28, Cambridge, Abstract Volume p.184.TechnologyWater
DS200712-0712
2007
Ulmer, P.Melekhova, E., Schmidt, M.W., Ulmer, P., Pettke, T.The composition of liquids coexisting with Dense Hydrous Magnesium silicates and the second critical endpoint in the MgO SiO2 H2O system.Frontiers in Mineral Sciences 2007, Joint Meeting of Mineralogical societies Held June 26-28, Cambridge, Abstract Volume p.184.TechnologyWater
DS200712-0902
2006
Ulmer, P.Rohrbach, A., Ballhaus, C., Golla-Schindler, U., Ulmer, P.Ferric ferrous iron ratios in upper mantle minerals.Geochimica et Cosmochimica Acta, In press availableMantleChemistry - iron
DS200712-0903
2007
Ulmer, P.Rohrbach, A., Ballhaus, C., Golla-Schindler, U., Ulmer, P., Kamenetsky, V.S., Kuzmin, D.V.Metal saturation in the upper mantle.Nature, Vol. 449, no. 7161, Sept. 27, pp.456-458.MantleOxygen fugacity
DS200712-0904
2007
Ulmer, P.Rohrbach, A., Ballhaus, C., Golla-Schindler, U., Ulmer, P., Schonbohm, D.Metal saturation in the upper mantle.Plates, Plumes, and Paradigms, 1p. abstract p. A848.MantleOxygen fugacities
DS201012-0585
2009
Ulmer, P.Pilet, S., Ulmer, P., Villiger, S.Liquid line of descent of a basanitic liquid at 1.5 Gpa: constraints on the formation of metasomatic veins.Contributions to Mineralogy and Petrology, In press formatted available 23p.TechnologyMetasomatism
DS201112-0719
2011
Ulmer, P.Nandedkar, R.H., Mattsson, H.B., Ulmer, P.Petrology of the Lake Natron Engaruka monogenetic volcanic fields, Gregory Rift (northern Tanzania).Peralk-Carb 2011, workshop held Tubingen Germany June 16-18, PosterAfrica, TanzaniaAlkalic
DS201112-0876
2011
Ulmer, P.Rohrbach, A., Ballhaus, C., Ulmer, P., Golla-Schindler, U., Schnbohm, D.Experimental evidence for a reduced metal saturated upper mantle.Journal of Petrology, Vol. 52, 4, pp. 717-737.MantleRedox
DS201212-0447
2012
Ulmer, P.Martin, L.H.J., Schmidt, M.W., Mattsson, H.B., Ulmer, P., Hametner, K., Gunther, D.Element partitioning between immiscible carbonatite-kamafugite melts with application to the Italian ultrapotassic suite.Chemical Geology, Vol. 320-321 pp. 96-112.Europe, ItalyCarbonatite
DS201312-0589
2013
Ulmer, P.Mattsson, H.B., Nandedkar, R.H., Ulmer, P.Petrogenesis of the melilititic and nephenilinitic rock suites in the Lake Natron-Engaruka monogenetic volcanic fields, northern Tanzania.Lithos, Vol. 179, pp. 175-192.Africa, TanzaniaMetasomatism
DS201702-0244
2017
Ulmer, P.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.
DS1970-0205
1970
Ulrich, G.D.Ulrich, G.D.A Study of the Kimberlites of South Africa and Their Related Ultramafic Nodules.British Columbia University Department Geology Report, No. 11, P. 67.South AfricaPetrology
DS1960-1046
1968
Ulrich, G.E.Ulrich, G.E.Maar Deposits in the San Francisco Volcanic Field, ArizonaGeological Society of America (GSA), PACIFIC COAST SECTION MEETING, P. 126.United States, Arizona, Colorado Plateau, Rocky MountainsDiatreme
DS1860-0008
1861
Ulrich, G.H.R.Ulrich, G.H.R.Vorkommen von Diamant im Ovens GoldfeldeBerg. U. Huettenm. Zeitung, Vol. 20, P. 424.Australia, VictoriaDiamond Occurrence
DS1860-0013
1864
Ulrich, G.H.R.Ulrich, G.H.R.Vorkommen von Diamant im Arena GoldefeldeBerg. U. Huettenm. Zeitung, Vol. 23, P. 347.Australia, VictoriaDiamond Occurrence
DS1860-0055
1867
Ulrich, G.H.R.Ulrich, G.H.R.Mineral Species of Victoria. In: Selwyn, A.r.c.; Ulrich, G.h.r. Notes on the Physical Geography, Geology and Mineralogy Of Victoria.Melbourne: Intercolonial Exhibition Essays, No. 3, PP. 40-83.Australia, VictoriaDiamond Occurrence
DS1970-0765
1973
Ulrich, G.W.Mcgetchin, T.R., Ulrich, G.W.Xenoliths in Maars and Diatremes with Inferences for the Moon, Mars and Venus.Journal of Geophysical Research, Vol. 78, PP. 1832-1852.United States, Colorado PlateauBlank
DS1975-1114
1979
Ulrich, J.Lelann, F., Ulrich, J.The Vibrocoring Technique and Continental Shelf Survey: The french Geological Survey (brgm)'s Experience.Resources Minerales Sous Marines, Scolari, G. Editor., French Geological Survey (BRGM) No. 7, PP. 217-232.South Africa, Southwest Africa, West Africa, NamibiaDiamond Mining Recovery, Alluvials, Marine Placers
DS201803-0458
2018
Ulrich, S.Konopasek, J., Janousek, V., Oyhantcabal, P., Slama, J., Ulrich, S.Did the circum Rodinia subduction trigger the Neoproterozoic rifting along the Congo Kalahari craton margin?International Journal of Earth Sciences, Vol. 106, 8, pp. 1-36.Africa, Namibiacraton

Abstract: Early Neoproterozoic metaigneous rocks occur in the central part of the Kaoko-Dom Feliciano-Gariep orogenic system along the coasts of the southern Atlantic Ocean. In the Coastal Terrane (Kaoko Belt, Namibia), the bimodal character of the ca. 820-785 Ma magmatic suite and associated sedimentation sourced in the neighbouring pre-Neoproterozoic crust are taken as evidence that the Coastal Terrane formed as the shallow part of a developing back arc/rift. The arc-like chemistry of the bimodal magmas is interpreted as inherited from crustal and/or lithospheric mantle sources that have retained geochemical signature acquired during an older (Mesoproterozoic) subduction-related episode. In contrast, the mantle contribution was small in ca. 800-770 Ma plutonic suites in the Punta del Este Terrane (Dom Feliciano Belt, Uruguay) and in southern Brazil; still, the arc-like geochemistry of the prevalent felsic rocks seems inherited from their crustal sources. The within-plate geochemistry of a subsequent, ca. 740-710 Ma syn-sedimentary volcanism reflects the ongoing crustal stretching and sedimentation on top of the Congo and Kalahari cratons. The Punta del Este-Coastal Terrane is interpreted as an axial part of a Neoproterozoic “Adamastor Rift”. Its opening started in a back-arc position of a long-lasting subduction system at the edge of a continent that fragmented into the Nico Pérez-Luís Alves Terrane and the Congo and Kalahari cratons. The continent had to be facing an open ocean and consequently could not be located in the interior of the Rodinia. Nevertheless, the early opening of the Adamastor Rift coincided with the lifetime of the circum-Rodinia subduction system.
DS1970-0999
1974
Ulrich, W.Ulrich, W.Hunting Herkimer DiamondsRockhound., Vol. 3, No. 5, PP. 4-7.United States, Appalachia, New YorkHerkimer Diamonds
DS1989-1524
1989
Ulrich, W.Ulrich, W.The quartz crystals of Herkimer County and its environsRocks and Minerals, Vol. 64, No. 2, April pp. 108-122GlobalSilicates, Mineralogy
DS201112-0965
2011
Ulry, B.Simandl, G.J., Fajber, R., Dunn, C.E., Ulry, B., Dahrouge, J.Biogeochemical exploration vectors in search of carbonatite, Blue River British Columbia.British Columbia Geological Survey, BCGS GeoFile, 2011-05.Canada, British ColumbiaCarbonatite
DS1986-0825
1986
Ulrych, J.Ulrych, J., Pivec, E., Rutsek, J.Spinel zonation in melilitite rocks of the Ploucnice Riverregion, CzechoslovakiaNeues Jahrbuch fnr Mineralogie, Vol. 155, No. 2, pp. 129-146GlobalMelilitite
DS1988-0718
1988
Ulrych, J.Ulrych, J., Pivec, E., Povondra, P., Rutsek, J.Perovskite from melilite rocks, Osecna complex, NorthernBohemia, CzechoslovakiaNeues Jahrbuch fnr Mineralogie Abh, No. 2, February pp. 81-95GlobalBlank
DS1993-1626
1993
Ulrych, J.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
DS1994-1811
1994
Ulrych, J.Ulrych, J., et al.Compositional evolution of metasomatic garnet in melilitic rocks of the Osecna complex, Bohemia.Canadian Mineralogist, Vol. 32, No. 3, Sept. pp. 637-648.GlobalMelilites
DS1998-1167
1998
Ulrych, J.Pivec, E., Ulrych, J., Hohndorf, A., Rutsek, J.Melilitic rocks from northern Bohemia: geochemistry and mineralogyNeues Jahr. Min. Abh., Vol. 173, No. 2, pp. 119-154.GlobalMelilites
DS2000-0963
2000
Ulrych, J.Ulrych, J., Pivec, E., Lang, M., Lloyd, F.E.Ijolite segregations in melilite nephelinite of Podhorni arch volcano, western Bohemia.Neues Jahr. Min. Abh., No. 175, No. 3, pp. 317-48.Europe, BohemiaOlivine nephelinite
DS201312-0927
2013
Ulrych, J.Ulrych, J., Krmiek, L.Recent views on lamprophyric melilitic rocks ( polzenites) of the Bohemian Massif.Goldschmidt 2013, 1p. AbstractEuropeMelilite
DS201609-1727
2016
Ulrych, J.Krmicek, L., Romer, R.L.,Ulrych, J., Glodny, J., Prelevic, D.Petrogenesis of orogenic lamproites of the Bohemian Massif: Sr-Nd-Pb-Li isotope constraints for Variscan enrichment of ultra-depleted mantle domains.Gondwana Research, Vol. 35, pp. 198-216.EuropeLamproite

Abstract: During convergence of Gondwana-derived microplates and Laurussia in the Palaeozoic, subduction of oceanic and continental crusts and their sedimentary cover introduced material of regionally contrasting chemical and isotopic compositions into the mantle. This slab material metasomatised the local mantle, producing a highly heterogeneous lithospheric mantle beneath the European Variscides. The eastern termination of the European Variscides (Moldanubian and Saxo-Thuringian zones of Austria, Czech Republic, Germany and Poland) is unusual in that the mantle was modified by material from several subduction zones within a small area. Orogenic lamproites sampled this lithospheric mantle, which has a chemical signature reflecting extreme depletion (low CaO and Al2O3 contents and high Mg-number) followed by strong metasomatic enrichment, giving rise to crust-like trace element patterns, variable radiogenic 87Sr/86Sr(330) (0.7062-0.7127) and non-radiogenic Nd isotopic compositions (eNd(330) = - 2.8 to - 7.8), crustal Pb isotopic compositions, and a wide range of d7Li values (- 5.1 to + 5.1). This metasomatic signature is variably expressed in the lamproites, depending on the extent of melting and the nature of the source of the metasomatic component. Preferential melting of the metasomatically enriched (veined) lithospheric mantle with K-rich amphibole resulted in lamproitic melts with very negative, crust-like d7Li values, which correlate positively with peralkalinity, HFSE contents and lower eNd. Both the higher degree of melting and progressive consumption of the metasomatic component reduce the chemical and isotopic imprints of the metasomatic end member. The very positive d7Li values of some lamproites indicate that the source of these lamproites may have been modified by subducted oceanic lithosphere. Fresh olivine from the Brloh (Moldanubian) lamproitic dyke shows very high Fo (up to 94%) and very high Li contents (up to 25 ppm), demonstrating that the extremely depleted and later enriched lithospheric mantle may have contributed significantly to the Li budget of the lamproites. The regional distribution of lamproites with contrasting chemical and isotopic fingerprints mimics the distribution of the different Variscan subduction zones.
DS201912-2796
2019
Ulrych, J.Krmickova, S., Krmicek, L., Romer, R.L., Ulrych, J.Lead isotope evolution of the Central European upper mantle: constraints from the Bohemian Massif.Geoscience Frontiers, 10.1016/j.gsf.2019.09.009 Europegeochronology

Abstract: The Pb isotope composition of the upper mantle beneath Central Europe is heterogeneous due to the subduction of regionally contrasting material during the Variscan and Alpine orogenies. Late Variscan to Cenozoic mantle-derived melts allow mapping this heterogeneity on a regional scale for the last ca. 340 Myr. Late Cretaceous and Cenozoic anorogenic magmatic rocks of the Bohemian Massif (lamprophyres, volcanic rocks of basanite/tephrite and trachyte/phonolite series) concentrate mostly in the Eger Rift. Cretaceous ultramafic lamprophyres yielded the most radiogenic Pb isotope signatures reflecting a maximum contribution from metasomatised lithospheric mantle, whereas Tertiary alkaline lamprophyres originated from mantle with less radiogenic 206Pb/204Pb ratios suggesting a more substantial modification of lithospheric source by interaction with asthenospheric-derived melts. Cenozoic volcanic rocks of the basanite/tephrite and trachyte/phonolite series define a linear mixing trend between these components, indicating dilution of the initial lithospheric mantle signature by upwelling asthenosphere during rifting. The Pb isotope composition of Late Cretaceous and Cenozoic magmatic rocks of the Bohemian Massif follows the same Pb growth curve as Variscan orogenic lamprophyres and lamproites that formed during the collision between Laurussia, Gondwana, and associated terranes. This implies that the crustal Pb signature in the post-Variscan mantle is repeatedly sampled by younger anorogenic melts. Most Cenozoic mantle-derived rocks of Central Europe show similar Pb isotope ranges as the Bohemian Massif.
DS202101-0021
2020
Ultych, J.Krmicek, L., Romer, R.L., Timmerman, M.J., Ultych, J., Glodny, J.Long lasting ( 65Ma) regionally contrasting Late-to Post-orogenic variscan mantle-derived potassic magmatism in the Bohemian Massif.Journal of Petrology, Vol. 61, 7, doi.org/10.1093 /petrology/egaa072Europemagmatism

Abstract: The orogenic development after the continental collision between Laurussia and Gondwana, led to two contrasting associations of mantle-derived magmatic rocks on the territory of the Bohemian Massif: (i) a 340-310?Ma lamprophyre-lamproite orogenic association; and (ii) a 300-275?Ma lamprophyre association of anorogenic affinity. Major types of potassic mantle-derived magmatic rocks recognized in the orogenic and anorogenic associations include: (i) calc-alkaline to alkaline lamprophyres; (ii) alkaline ‘orthopyroxene minettes’ and geochemically related rocks grouped here under the new term lampyrite; and (iii) peralkaline lamproites. These three types significantly differ with respect to mineral, whole-rock and Sr-Nd-Pb-Li isotope composition and spatial distribution. The calc-alkaline lamprophyres occur throughout the entire Saxo-Thuringian and Moldanubian zones, whereas the different types of malte-derived potassic rocks are spatially restricted to particular zones. Rocks of the Carboniferous lamprophyre-lamproite orogenic association are characterized by variable negative eNd(i) and variably radiogenic Sr(i), whereas the rocks of the Permian lamprophyre association of anorogenic affinity are characterized by positive eNd(i) and relatively young depleted-mantle Nd-model ages reflecting increasing input from upwelling asthenospheric mantle. The small variation in the Pb isotopic composition of post-collisional potassic mantle-derived magmatic rocks (of both the orogenic and anorogenic series) implies that the Pb budget of the mantle beneath the Bohemian Massif is dominated by the same crust-derived material, which itself may include material derived from several sources. The source rocks of ‘orthopyroxene minettes’ are characterized by isotopically light (‘eclogitic’) Li and strongly radiogenic (crustal) Sr and may have been metasomatized by high-pressure fluids along the edge of a subduction zone. In contrast, the strongly Al2O3 and CaO depleted mantle source of the lamproites is characterized by isotopically heavy Li and high SiO2 and extreme K2O contents. This mantle source may have been metasomatized predominantly by melts. The mantle source of the lamprophyres may have undergone metasomatism by both fluids and melts.
DS201609-1751
2010
Uludag, E.Uludag, E.A directional drilling technique for exploration and mining of deep alluvial diamond deposits.The 4th Colloquium on Diamonds - source to use held Gabarone March 1-3, 2010, 12p.Africa, South AfricaDeposit - Namaqualand mines

Abstract: Alluvial diamond deposits covered with a thick overburden cannot be explored effectively and mined profitably with the available conventional techniques. A novel directional drilling technique has been developed and site trials have been conducted at the e Beers Namaqualand Mines situated at the western coast of South Africa. This paper describes the technique developed as well as the results of the site trials. The main task of the project is to develop a tool and a supporting system to achieve a remote exploration and ore extraction method for inaccessible alluvial diamond deposits. The project involves the acquisition of a system, commissioning on-site and evaluating the information obtained during assessment. The project consists of the design - of certain tools and instrumentation for the system, investigations and desktop studies as well as development of the systems logistics. The operating philosophy of the system is based on the keyhole surgery principle. In this study a pilot hole was drilled first, starting from the surface with an inclination to reach deeply seated diamondiferous gravel layers, followed by drilling into a more or less horizontal gravel layer for a certain length and finally pointing-upwards reaching ground surface at a predetermined exit point. The pilot drill bit was then replaced with a larger diameter reamer/mining tool and an HDPE tail pipe was attached behind the reamer. The drill string was retracted back to enlarge the guide hole and flush the excavated ore to the surface through the tail pipe. The material flow in between the sections of the system was carefully measured to assess and record the gravel recovery rates. Several horizontal holes were drilled at preplanned drill paths to reach and follow the ore layer and the ore extraction was achieved by means of a reamer/mining tool. Principles of the concept have been proven viable in this investigation
DS201703-0398
2017
Ulvrova, M.Coltice, N., Gerault, M., Ulvrova, M.A mantle convection perspective on global tectonics. ReviewEarth Science Reviews, Vol. 165, pp. 120-150.MantleTectonics

Abstract: The concept of interplay between mantle convection and tectonics goes back to about a century ago, with the proposal that convection currents in the Earth’s mantle drive continental drift and deformation (Holmes, 1931). Since this time, plate tectonics theory has established itself as the fundamental framework to study surface deformation, with the remarkable ability to encompass geological and geophysical observations. Mantle convection modeling has progressed to the point that connections with plate tectonics can be made, pushing the idea that tectonics is a surface expression of the global dynamics of one single system: the mantle-lithosphere system. Here, we present our perspective, as modelers, on the dynamics behind global tectonics with a focus on the importance of self-organisation. We first present an overview of the links between mantle convection and tectonics at the present-day, examining observations such as kinematics, stress and deformation. Despite the numerous achievements of geodynamic studies, this section sheds light on the lack of self-organisation of the models used, which precludes investigations on feedbacks and evolution of the mantle-lithosphere system. Therefore, we review the modeling strategies, often focused on rheology, that aim at taking into account self-organisation. The fundamental objective is that plate-like behaviour emerges self-consistently in convection models. We then proceed with the presentation of studies of continental drift, seafloor spreading and plate tectonics in convection models allowing for feedbacks between surface tectonics and mantle dynamics. We discuss the approximation of the rheology of the lithosphere used in these models (pseudo-plastic rheology), for which empirical parameters differ from those obtained in experiments. In this section, we analyse in detail a state-of-the-art 3D spherical convection calculation, which exhibits fundamental tectonic features (continental drift, one-sided subduction, trench and ridge evolution, transform shear zones, small-scale convection, and plume tectonics). This example leads to a discussion where we try to answer the question: can mantle convection models transcend the limitations of plate tectonics theory?
DS201711-2508
2017
Ulvrova, M.Coltice, N., Gerault, M., Ulvrova, M.A mantle convection perspective on global tectonics.Earth Science Reviews, Vol. 165, pp. 120-150.Mantletectonics

Abstract: The concept of interplay between mantle convection and tectonics goes back to about a century ago, with the proposal that convection currents in the Earth's mantle drive continental drift and deformation (Holmes, 1931). Since this time, plate tectonic theory has established itself as the fundamental framework to study surface deformation, with the remarkable ability to encompass geological and geophysical observations. Mantle convection modeling has progressed to the point where connections with plate tectonics can be made, pushing the idea that tectonics is a surface expression of the global dynamics of one single system: the mantle-lithosphere system. Here, we present our perspective, as modelers, on the dynamics behind global tectonics with a focus on the importance of self-organisation. We first present an overview of the links between mantle convection and tectonics at the present-day, examining observations such as kinematics, stress and deformation. Despite the numerous achievements of geodynamic studies, this section sheds light on the lack of self-organisation of the models used, which precludes investigations of the feedbacks and evolution of the mantle-lithosphere system. Therefore, we review the modeling strategies, often focused on rheology, that aim at taking into account self-organisation. The fundamental objective is that plate-like behaviour emerges self-consistently in convection models. We then proceed with the presentation of studies of continental drift, seafloor spreading and plate tectonics in convection models allowing for feedbacks between surface tectonics and mantle dynamics. We discuss the approximation of the rheology of the lithosphere used in these models (pseudo-plastic rheology), for which empirical parameters differ from those obtained in experiments. In this section, we analyse in detail a state-of-the-art 3-D spherical convection calculation, which exhibits fundamental tectonic features (continental drift, one-sided subduction, trench and ridge evolution, transform shear zones, small-scale convection, and plume tectonics). This example leads to a discussion where we try to answer the following question: can mantle convection models transcend the limitations of plate tectonic theory?
DS2001-1172
2001
Ulyanov, A.A.Ulyanov, A.A., Ustinov, V.I., Turchkova, A.G., Pekov, I.V.Oxygen isotope composition of minerals from highly alkalic rocks of the Khibiny Massif ( Kola Peninsula).Moscow University Bulletin, Vol.56,4,pp.56-63.Russia, Kola PeninsulaAlkaline rocks - not specific to diamonds
DS202001-0042
2019
Ulyashev, V.Sumilova, T., Maximentko, N., Zubov, A., Kovalchuk, N., Ulyashev, V., Kis, V.Varieties of impactites and impact diamonds of the Kara meteorite crater ( Pay-Khoy, Russia).Geoscience Frontiers, 10.1016/j.gsf/2019.09.0111 1p. Abstract Conf.Russia, Siberiaimpact diamonds

Abstract: Impact diamonds are technical material with valuable mechanical properties. Despite of a quite long story from their discovery and huge diamond storages at the Popigai astrobleme (Siberia, Russia) they were not involved into industrial production, first of all because of remoteness of objects, complexity of extraction and economically more favourable synthesis of technical diamonds in the seventies of the past century. However, due to the high hardness of impact diamonds and also to the high demand of new carbon materials, including nanomaterials, the interest towards this type of natural diamonds is significantly increased in the recent years. Although the mentioned Popigai astrobleme is situated in a remote part of Russia it has been studied in more details. At the same time, the less known Kara giant meteorite crater (Pay-Khoy, Russia) is situated essentially closer to the industrial infrastructure of the European part of Russia. This astrobleme, similarly to Popigai, is enriched in impact diamonds as well. But, till recent years it was not deeply studied using modern analytical methods. During our studies in 2015 and 2017 at the territory of the Kara meteorite crater we have distinguished and described 5 varieties of impactites - bulk melt impactites which form cover-like and thick dike bodies; melt ultrahigh-pressure vein bodies and at least 3 types of suevites formed after specific sedimentary target rocks. These varieties have typomorphic features regarding the crystallinity and mineral composition. It was found that all of them have high concentration of microdiamonds formed by high-pressure high temperature pyrolysis mechanism from precursor materials like coal and organic relicts. Using a set of modern mineralogical methods we have found two principal types of diamond morphologies within the Kara impactites - sugar-like after coal diamonds and diamond paramorphs after organic relicts. The Kara diamonds have several accompanying carbon substances including newly formed graphite, glass-like carbon and probably carbyne. The studied diamondiferous Kara impactites provide an essentially novel knowledge of impact processes in sedimentary targets.
DS201806-1251
2018
Ulyashev, V.V.Shunilova, T.G., Isaenko, S.I., Ulyashev, V.V., Kazakov, V.A., Makeev, B.A.After coal diamonds: an enigmatic type of impact diamonds. Kara astrobleme ( Pay-Khoy)European Journal of Mineralogy, Vol. 30, 1, pp. 61-76.Russiameteorites

Abstract: Impact diamonds were discovered in the 70s and are usually accepted as being paramorphs after graphite, resulting in grains of extremely high mechanical quality. A diffusion-less mechanism for the graphite-to-diamond transition under huge pressure has been experimentally realized and theoretically explained. Besides, another type of impact product has received much less attention, namely diamonds formed after coal as a result of the impact. Here we describe after-coal impact diamonds from the giant Kara astrobleme (Pay-Khoy, Russia), which resulted from a large asteroid impact about 70?Ma ago. The impact created a large number of unusual impact diamonds, which are described here for the first time using high-resolution techniques including visible and UV Raman spectroscopy, scanning electron microscopy (SEM), atomic force microscopy (AFM) and transmission electron microscopy (TEM). Two main varieties of after-coal diamonds occur: micrograined (sugar-like, subdivided into coherent and friable) and, as a new type, paramorphs after organic relics. After-coal diamonds differ from after-graphite impact diamonds by the texture, the absence of lonsdaleite, a micro- and nanoporous structure. The sugar-like variety consists of tightly aggregated, well-shaped single nanocrystals. The after-organic diamond paramorphs are characterized by a well-preserved relict organic morphology, sub-nanocrystalline-amorphous sp3-carbon (ta-C) nanocomposites and other specific properties (optical transparence, brown color, very high luminescence, spectral features). Based on the description of after-coal diamonds, we propose a new, polystage formation mechanism: high-velocity coal pyrolysis with hetero-elements removal followed by diffusion-limited crystallization of pure carbon. The similarity of the after-coal diamonds features with carbonado is a strong piece of evidence in support of the impact hypothesis for the origin of carbonado.
DS201809-2087
2018
Ulyashev, V.V.Shumilova, T.G., Ulyashev, V.V., Isaenko, S.I.A new type of impact diamonds: diamond paramorphs after wood relics. Kara astrobleme ( Pay-Khoy)81st Annual Meeting of the Meteoritical Society 2018, LPI contribution No. 2067, 1p. AbstractRussiadiamond - impact

Abstract: Impact diamonds are known as high quality technical material [1]. Usually they are formed by graphite-to-diamond solid-phase diffuse-less transition at shock pressures > 30 GPa. The diffuse-less mechanism had been proven by numerous experimental studies [2]. But impact diamond formation is possible from non-graphitic precur-sor too, from amorphous carbons and bitumenes, while the process is rare known and slightly studied. In the nature not only graphite of metamorphic rocks but sedimentary organic matter containing rocks can be treated by impact processes resulting by high pressure phases up to after-coal diamond formation [3]. The only two astroblemes with after-coal diamonds have been found by present - the giant Kara and Ust`-Kara astroblemes with 65 and 25 km in diameters correspondently [1, 3]. The novel data on impact diamonds and impact objects are very actual since the practical interest to impact diamonds last time is rising [4, 5]. Here we present the after-coal diamonds features including a new impact diamond variety (Fig. 1) presented by after-organics diamond paramorphs first time found at the Kara astrobleme (Pay-Khoy, Russia) [6]. The paramorphs are characterized with perfectly preserved micromorphology of the wood relics being composed of pure carbon content with polynanocrystalline structure has been proven with Raman spectroscopy, transmission electron microscopy, atomic force microscopy and other modern methods. The received data on after-coal diamonds point to their formation by low-distance diffuse mechanism described for low ordered carbons by Borimchuk et al. [7]. The received data allow to present a new impact diamond variety widely spread through the Kara astrobleme counting huge concentrations - up to several thousand carat per ton [6]. The proposed novel mechanism of impact diamonds formation is characterized with several stages including high pressure high temperature fast pyrolysis with the precursor carbonization co-followed with diamond crystallization through low-distance diffuse mechanism [6]. The provided study allow suppose possibility of wide distribution of impact diamonds formed after noncrystalline carbons and organics of sedimentary objects at large impact craters around the world.
DS1984-0536
1984
Ulyashin, A.G.Mudryi, A.V., Pushkarc, A.L., Tkachev, V.D., Ulyashin, A.G.Noble Gas Atoms as Interstitials in Silicon and DiamondPhys. St. S-b., Vol. 125, No. 1, SEPTEMBER PP. K75-K78.RussiaMineral Chemistry
DS200812-0001
2008
Ulyych, J.Abrates, M., Viererck-Goette, L., Ulyych, J., Munsel, D.Melilitic rocks of the CECIP examples from Vogtland W. Bohemia.Goldschmidt Conference 2008, Abstract p.A2.Europe, Germany, Czech RepublicMelilitite
DS201312-0678
2013
Uma, V.Pandey, O.P., Vedanti, N., Srivastava, R.P., Uma, V.Was Archean Dharwar craton ever stable? A seismic perspective.Journal of the Geological Society of India, Vol. 81, 6, pp. 774-780.IndiaGeophysics - seismics
DS1988-0719
1988
Umeda, I.Umeda, I.Fading of coloured diamond by thermal neutron irradiationPatent: JPN Kokai Tokkyo Koho 88162600 A2 July 1988, 3pJapanPatent, Diamond irradiation
DS200412-2017
2004
Umemoto, K.Tscuchiya, T., Tsuchiya, J., Umemoto, K., Wentzcovitch, R.M.Elasticity of post perovskite MgSiO3.Geophysical Research Letters, Vol. 31, 14, July 28, 10.1029/2004 GLO20278MantlePerovskite mineralogy
DS200412-2018
2004
Umemoto, K.Tsuchiya, T., Tsuchiya, J., Umemoto, K., Wentzcovitch, R.M.Phase transition in MgSiO3 perovskite in the Earth's lower mantle.Earth and Planetary Science Letters, Vol. 224, 3-4, pp. 241-248.MantleMineralogy
DS1990-1350
1990
Umemoto, N.Shimizu, H., Umemoto, N., Masuda, A., Appel, P.W.U.Sources of iron formations in the Archean Isua and Malene supracrustalsGeochimica et Cosmochimica Acta, Vol. 54, No. 4, April pp. 1147-1154GreenlandIron formations, Geochronology
DS200712-1063
2007
Umezawa, H.Takuda, N., Saito, T., Umezawa, H., Okushi, H., Yamasaki, S.The role of boron atoms in heavily boron doped semiconducting homoepitaxial diamond growth - study of surface morphology.Diamond and Related Materials, Vol. 16, 2, Feb., pp. 409-411.TechnologyDiamond morphology
DS200712-1086
2007
Umezawa, H.Tokuda, N., Saito, T., Umezawa, H., Okushi, H., Yamasaki, S.The role of boron atoms in heavily boron-doped semiconducting homoepitaxial diamond growth. Study of surface morphology.Diamond and Related Materials, Vol. 16, 2, pp. 409-411. Ingenta 1070685096TechnologyDiamond morphology
DS201502-0044
2015
Umili, G.Bonetto, S., Facello, A., Ferrero, A-M., Umili, G.A tool for semi-automatic linear feature detection based on DTM.Computers & Geosciences, Vol. 75, pp. 1-12.TechnologyNot specific to diamonds
DS2002-1010
2002
Umino, S.Matsumoto, T., Pinti, D.L., Matsuda, J-I., Umino, S.Recycled noble gas and nitrogen in the subcontinental lithospheric mantle: implications for N He Ar in fluid inclusions of SE Australian xenoliths.Geochemical Journal, Vol. 36, pp.209-17.AustraliaGeochronology - xenoliths, Newer volcanics
DS201710-2270
2017
Umino, S.Umino, S., Knayama, K., Kitamura, K., Tamura, A., Ishizuka, A., Senda, R., Arai, S.Did boninite originate from the heterogeneous mantle with reycled ancient slab?Island Arc, Sept. 28, 3p.Mantlesubduction

Abstract: Boninites are widely distributed along the western margin of the Pacific Plate extruded during the incipient stage of the subduction zone development in the early Paleogene period. This paper discusses the genetic relationships of boninite and antecedent protoarc basalt magmas and demonstrates their recycled ancient slab origin based on the T-P conditions and Pb-Hf-Nd-Os isotopic modeling. Primitive melt inclusions in chrome spinel from Ogasawara and Guam islands show severely depleted high-SiO2, MgO (high-silica) and less depleted low-SiO2, MgO (low-silica and ultralow-silica) boninitic compositions. The genetic conditions of 1?346?°C at 0.58?GPa and 1?292?°C at 0.69?GPa for the low- and ultralow-silica boninite magmas lie on adiabatic melting paths of depleted mid-ocean ridge basalt mantle with a potential temperature of 1?430?°C in Ogasawara and of 1?370?°C in Guam, respectively. This is consistent with the model that the low- and ultralow-silica boninites were produced by remelting of the residue of the protoarc basalt during the forearc spreading immediately following the subduction initiation. In contrast, the genetic conditions of 1?428?°C and 0.96?GPa for the high-silica boninite magma is reconciled with the ascent of more depleted harzburgitic source which pre-existed below the Izu-Ogasawara-Mariana forearc region before the subduction started. Mixing calculations based on the Pb-Nd-Hf isotopic data for the Mariana protoarc basalt and boninites support the above remelting model for the (ultra)low-silica boninite and the discrete harzburgite source for the high-silica boninite. Yb-Os isotopic modeling of the high-Si boninite source indicates 18-30?wt% melting of the primitive upper mantle at 1.5-1.7?Ga, whereas the source mantle of the protoarc basalt, the residue of which became the source of the (ultra)low-Si boninite, experienced only 3.5-4.0?wt% melt depletion at 3.6-3.1?Ga, much earlier than the average depleted mid-ocean ridge basalt mantle with similar degrees of melt depletion at 2.6-2.2?Ga.
DS1991-1762
1991
Umpherson, D.Umpherson, D., Bennett, D., Webb, J.R., Hart, J.Bush safety in mineral explorationMinistry of Northern Development and Mines Education series, No. 2, 67pOntarioManual for safety, book, Mineral exploration -safety measures
DS201807-1533
2018
Underwood, E.Underwood, E.Linking mantle plumes to volcanoes and hot spot tracks.Journal of Geophysical Research, DOI.org/ 101029/ 2018EO099733Mantlehotspots
DS201908-1819
2019
Underwood, E.Underwood, E.A more accurate global river map.EOS, 100 10.1029/2019 EO128033 July 12Globalgeomorphology

Abstract: Mapping all of the world’s rivers, creeks, and streams is a daunting task, particularly in places like the Arctic, where accurate topographic data are hard to obtain. Scientists now have created a new map of global rivers based on a largely automated computer algorithm that can accurately predict where rivers flow—a tool that could help project future flooding as Earth’s climate changes. Many different factors affect the flow of water over land, including terrain steepness, watershed size, and human-built structures like canals. Scientists have previously used topographic data collected by spacecraft such as NASA’s Shuttle Radar Topography Mission to generate detailed, 3-D models of Earth’s surface, but these maps sometimes distort the slope of local terrain due to observation errors. In the new study, Yamazaki et al. used an updated version of a popular topographic data set called the Multi-Error-Removed Improved-Terrain Digital Elevation Model (MERIT DEM), which was published in 2017 by members of the same team, to develop a computer algorithm that predicts where rivers flow with very little human guidance. The new, publicly available hydrographic data set, called MERIT Hydro, reveals rivers at high resolution in approximately 90- × 90-meter gridded pixels, includes the Arctic region, and is less prone to errors caused by tree canopies or inaccurate elevation than existing global hydrographic maps, the authors write. Compared with existing maps, the synthetic hydrographic maps made remarkably accurate predictions of where rivers, such as China’s Pearl River and the Ob River in Russia, should be, the team reported. To further refine the map, the team also included global Landsat data, as well as data from the crowdsourced mapping database OpenStreetMap, which the researchers searched using tags such as waterway, river, stream, brook, and wadi. On the basis of this combined data set, the algorithm integrated information on small streams not captured by current satellite images. The OpenStreetMap data also allowed the researchers to generate maps of human-made stream networks, like irrigation canals, that could be flood prone. A remaining challenge for more accurate river mapping is in arid regions such as the Danakil Desert in Ethiopia, where streams are often intermittent and ephemeral, the researchers noted. The team writes that it hopes other scientists will build upon and improve the free, open-source MERIT Hydro program, noting that it could be used in predicting flood risks and analyzing ecosystem biodiversity and carbon emissions.
DS200712-1099
2006
Underwood, T.Underwood, T.Digital color communications for gemstones with an exploration of applications within our industry.Gems & Gemology, 4th International Symposium abstracts, Fall 2006, p.143. abstract onlyTechnologyDiamond colour grading
DS1995-1940
1995
UNEP Industry and environmentUNEP Industry and environmentUnited Nations training manual for environmentUnep, $ 160.00 United StatesZambia, AustraliaBook -ad, Environment
DS200412-0367
2004
Ungar, T.Cordier, P., Ungar, T., Zsoldos, L., Tichy, G.Dislocation creep in MgSiO3 perovskite at conditions of the Earth's uppermost lower mantle.Nature, No. 6985, April 22, pp. 837-839.MantleMineralogy
DS1982-0571
1982
Ungararetti, L.Smith, D.C., Domeneghetti, C., Rossi, G., Ungararetti, L.Single Crystal Structure Refinements of Super Silicic Clinopyroxenes from the Zagadochnaya Kimberlite Pipe, Yakutia, Ussr.Proceedings of Third International Kimberlite Conference, TERRA COGNITA, ABSTRACT VOLUME., Vol. 2, No. 3, P. 223, (abstract.).RussiaKimberlite, Microprobe, Chemistry
DS1995-1370
1995
UngarettiOberti, R., Hawthorne, F.C., Ungaretti, CannilloAluminum disorder in amphiboles from mantle peridotitesCanadian Mineralogist, Vol. 33, No. 4, August pp. 867-878.MantlePeridotites
DS1995-1941
1995
Unger, J.Unger, J.Merger and acquisition strategiesMining Tax Strategies, Held Feb. 1995, 27pCanadaTaxation, Economics -acquisitions, mergers
DS202012-2238
2019
Ungson, G.R.Park, S.J., Ungson, G.R.Rough diamonds in emerging markets: legacy, Competitiveness, and sustained high performance.Cross Cultural & Strategic Management, Vol. 26, 3, pp. 363-386.GlobalBlank

Abstract: The purpose of this paper is to uncover the underlying drivers of sustained high performing companies based on a field study of 127 companies in Brazilian, Russian, Indian and Chinese (BRIC) and Association of Southeast Asian Nations (ASEAN) emerging markets. Understanding these companies provides a complementary way of appraising the growth, development and transformation of emerging markets. The authors synthesize the findings in an overarching framework that covers six strategies for building and sustaining legacy that leads to the succession of intergenerational wealth over time: overcoming institutional voids, inclusive markets, deepening localization, nurturing government support, building core competencies and harnessing human capital. The authors relate these strategies to different levels of development using Prahalad and Hart’s BOP framework.
DS1930-0231
1936
Union Of South AfricaUnion Of South AfricaThe Mineral Resources of the Union of South Africa. with a Summary of the Mineral Resources of Southwest Africa.Pretoria: Union of South Africa Department of Mines, 454P.Southwest Africa, NamibiaKimberley, Diamond Occurrences, Mineral Resources
DS200412-2022
2003
United NationsUnited NationsUN panel says Liberia sanctions should be extended. Mentions diamonds.Reuters, Nov. 6, 1p.Africa, LiberiaNews item - conflict diamonds
DS201212-0741
2011
United NationsUnited NationsUN Group of experts' report on the DR Congo.United Nations, un.org, Dec. 30, 295p.Africa, Democratic Republic of CongoHistory, legal
DS1991-1763
1991
United Nations Development ProgrammeUnited Nations Development ProgrammeTanzania -diamondsUnited Nations Dev. Programme, pp. 78-83.TanzaniaDiamonds, Overview of provinces
DS1992-1579
1992
United Nations Development ProgrammeUnited Nations Development ProgrammeMineral investment conditions in ChinaUn Development Programme Economic And Social Commission For Asia And, pp. 35-81ChinaEconomic, Mineral investment -criteria
DS1992-1580
1992
United Nations Development ProgrammeUnited Nations Development ProgrammeA global survey of mineral company investment preferencesUn Development Programme Economic And Social Commission For Asia And, pp. 330-342GlobalEconomics, Mineral investment -ranking
DS1992-1581
1992
United Nations Development ProgrammeUnited Nations Development ProgrammeIndia: a summary of mineral investment conditionsUn Development Programme Economic And Social Commission For Asia And, pp. 82-98IndiaEconomic, Mineral investment -criteria
DS1981-0413
1981
United States Bureau Of MinesUnited States Bureau Of MinesDiamond - IndustrialMineral Facts and Problems, 1980 edition, Bulletin. 671, 14p.United StatesDiamond - Markets, Industry, Economics
DS1984-0747
1984
United States Bureau Of MinesUnited States Bureau Of MinesMineral Commodity Summaries Industrial DiamondUnited States Bureau of Mines MINERAL COMMODITY SUMMARIES, 1984, AN UP TO DATE SU, JANUARY, 1P.United StatesProduction, Figures
DS1986-0826
1986
United States Bureau of MinesUnited States Bureau of MinesDiamond in ZaireUnited States Bureau of Mines Mineral Perspectives, Zaire, pp. 17-18Democratic Republic of CongoMbuji Mai, Tshikapa
DS1989-1031
1989
United States Bureau of MinesMineral Industry Surveys, United States Bureau of MinesIndustrial minerals supply /demand 1975- 1985. one page 'diamonds'United States Bureau of Mines Mineral Industry Surveys, p. 33United StatesDiamond production, Import
DS1989-1525
1989
United States Bureau of MinesUnited States Bureau of MinesState mineral summaries: Arkansaw. One line lists diamond productionvalueUnited States Bureau of Mines State Mineral Summaries, p. 13-14ArkansasDiamond, Production
DS1989-1526
1989
United States Bureau of MinesUnited States Bureau of MinesMineral industries of Latin America: Guyana and VenezuelaMineral Perpectives, July pp. 72-73, 124-129GlobalBrief overview of countries, Diamonds mentioned
DS1989-1527
1989
United States Bureau of MinesUnited States Bureau of MinesMineral commodity summaries. DiamondMineral Commodity Summaries, USBM., pp. 48-49Global, United StatesEconomics, Industrial diamonds
DS1989-1528
1989
United States Bureau of MinesUnited States Bureau of MinesMineral issues -1989 competitiveness and regulationsUnited States Bureau of Mines Mineral Issues, 84pUnited StatesEconomics, Mineral issues reviews
DS1990-1488
1990
United States Bureau of MinesUnited States Bureau of MinesMineral commodity summaries 1990United States Bureau of Mines, Mineral commodity summaries volume, 200pUnited StatesEconomics, Commodity -brief review
DS1990-1489
1990
United States Bureau of MinesUnited States Bureau of MinesDiamond -industrialMineral Commodity Summaries 1990, pp. 54-55United StatesEconomics, Industrial diamond summar
DS1991-1764
1991
United States Bureau of MinesUnited States Bureau of MinesThe New Materials Society, Materials shifts in the new societyU.s. Department Of Interior, Bureau Of Mines, 200pUnited StatesMaterials use, Table of contents
DS1991-1765
1991
United States Bureau of MinesUnited States Bureau of MinesShifting material uses: why they occurThe New Materials Society, Vol. 3, July 1991United States, GlobalEconomics, Materials -patterns of use
DS1991-1766
1991
United States Bureau of MinesUnited States Bureau of MinesDiamond. (Industrial) Brief overviewMineral Commodity Summaries 1991, pp. 48-49United States, GlobalIndustrial diamond, Production, demand
DS1992-1582
1992
United States Bureau of MinesUnited States Bureau of MinesDirectory of principal U.S. gemstone producers in 1991. List includes # 74Crater of Diamonds State ParkUnited States Bureau of Mines Mineral Industry Surveys, April 1, 1992, 49pArkansasList of producers, Gemstones in general - no production figures
DS1992-1583
1992
United States Bureau of MinesUnited States Bureau of MinesIndustrial diamonds 1992 (USBM)Mineral Commodity Summaries for 1992, pp. 58-59GlobalEconomics, Industrial diamond production, supply
DS1992-1584
1992
United States Bureau of MinesUnited States Bureau of MinesMineral commodity summaries 1992Usbm., 200pUnited States, GlobalCommodities, Brief 1 or 2 page overview
DS1993-1627
1993
United States Bureau of MinesUnited States Bureau of MinesMinerals industries of Asia and Pacific 1991U.s. Minerals Yearbook, Publishing Fall 1993, 404p.$ 24.00AsiaMining, Economics
DS1993-1628
1993
United States Bureau of MinesUnited States Bureau of MinesEurope and Central EurasiaUsbm Mineral Industries, 400p. approx. $ 45.00 United StatesEurope, Central EurasiaTable of contents, Mineral industries
DS1993-1629
1993
United States Bureau of MinesUnited States Bureau of MinesMinerals industries of Latin America and CanadaU.s. Minerals Yearbook, Publishing Fall 1993, 429p. $ 26.00Latin America, CanadaMining, Economics
DS1993-1630
1993
United States Bureau of MinesUnited States Bureau of MinesMineral commodity summaries 1993 - industrial diamondUnited States Bureau of Mines Mineral Commodity summaries, pp. 56-57.United StatesEconomics, Diamond -industrial diamond
DS1993-1631
1993
United States Bureau of MinesUnited States Bureau of MinesMetals and Materials for 1991U.s. Minerals Yearbook, Publishing Fall 1993, 1754p.$ 61.00United StatesMining, Economics
DS1994-1812
1994
United States Bureau of MinesUnited States Bureau of MinesInternational minerals informationUnited States Bureau of Mines, Latin AmericaBook -ad, Minerals Yearbook
DS1995-1942
1995
United States Bureau of MinesUnited States Bureau of MinesCD-ROMS on minerals and materialsUnited States Bureau of Mines, AdUnited StatesInformation -advertisement, Mineral commodities, economics
DS1900-0470
1907
United States Daily CircularUnited States Daily CircularGermans Hunt for a Diamond Field Near Ichoufu #2United States Daily Circular, No. 2982, SEPT. 26TH., PP. 13-14.China, Shandong, IchoufuHistory, Politics, Diamond Occurrence
DS1975-0643
1977
United States Gemological ServicesUnited States Gemological ServicesEverything You've Always Wanted to Know about DiamondsU.s. Gemological Service, Santa Ana, California., 92P.GlobalKimberley, Investment
DS1900-0232
1904
United States Geological SurveyUnited States Geological SurveyGems of CaliforniaUnited States Geological Survey (USGS) MINERALS YEARBOOK FOR 1904, P. 961.United States, California, West CoastDiamond Occurrence
DS1900-0380
1906
United States Geological SurveyUnited States Geological SurveyDiamonds in California, 1906United States Geological Survey (USGS) MINERALS YEARBOOK FOR 1906, PP. 1217-1218.United States, California, West CoastDiamond Occurrence
DS1990-1490
1990
United States Geological Survey (USGS)United States Geological Survey (USGS)Dictionary of Mining termsUnited States Geological Survey (USGS) - updated version of 1990 USBM., $ CD ROM 15.00GlobalMining terminology, Dictionary
DS1991-1767
1991
United States Geological Survey (USGS)United States Geological Survey (USGS)Pacific region, southwest quadrantUnited States Geological Survey (USGS), Map No. CP-39 Circum Pacific series, 1: 10 m. $ 6.70GlobalMap, Geology
DS1991-1768
1991
United States Geological Survey (USGS)United States Geological Survey (USGS)Quaternary geologic map of the Blue Ridge 4 X 6 quadrangleUnited States Geological Survey (USGS), Map, Map I-1420, NJ-17, 1: 1, 1000, 000 $ 3.60GlobalTennessee, Geomorphology -map
DS1991-1769
1991
United States Geological Survey (USGS)United States Geological Survey (USGS)Quaternary geologic map of the Erie 4 X 6 quadrangleUnited States Geological Survey (USGS), Map, miscellaneous Map I-1420, NK-17, 1: 1, 1000, 000 $ 3.60Ontario, Pennsylvania, Ohio, Michigan, New York, West VirginiaGeomorphology -map
DS1991-1770
1991
United States Geological Survey (USGS)United States Geological Survey (USGS)1991 United States Industrial outlookUnited States Geological Survey (USGS), $ 28.00United StatesBook -ad, Industrial minerals
DS1993-1632
1993
United States Geological Survey (USGS)United States Geological Survey (USGS)Geology and mineral resource assessment of the Venezuelan Guayana shieldUnited States Geological Survey (USGS) Bulletin, No. B 2062, 121p. $ 20.00Venezuela, GuyanaTable of contents, Mineralization, metallogeny
DS1994-1813
1994
United States Geological Survey (USGS)United States Geological Survey (USGS)Computer technology meeting held New Orleans April 1994United States Geological Survey (USGS) Open file, No. 94-0052, 61pGlobalComputer meeting, Table of contents
DS1994-1814
1994
United States Geological Survey (USGS)United States Geological Survey (USGS)Mineral industries of the Middle EastUnited States Geological Survey (USGS) Minerals Yearbook, 105pGlobalMineral industries, Map -ad
DS1996-1450
1996
United States Geological Survey (USGS)United States Geological Survey (USGS)Circum Pacific map series.United States Geological Survey (USGS), No prices givenGlobalMap - ad, Tectonic, geology, geodynamics
DS1997-1181
1997
United States Geological Survey (USGS)United States Geological Survey (USGS)4th. International Symposium on environmental geochemistryUnknown, United StatesConference Oct 1997, Geochemistry - environmental
DS1998-1498
1998
United States Geological Survey (USGS)United States Geological Survey (USGS)Industrial diamond - annual review 1998United States Geological Survey (USGS) Mineral Industry Surveys, Aug. 8p.United StatesDiamond - industrial, production, costs
DS1998-1499
1998
United States Geological Survey (USGS)United States Geological Survey (USGS)Gemstones ... annual review for 1997.Tables for in ports of diamonds forconsumption.United States Geological Survey (USGS), July, pp. 9-11.United StatesDiamond imports, Production
DS1998-1500
1998
United States Geological Survey (USGS)United States Geological Survey (USGS)Diamond (industrial), 1998Mineral Commodity Summaries 1998, pp. 54-5.United StatesProduction, imports
DS1999-0756
1999
United States Geological Survey (USGS)United States Geological Survey (USGS)Gemstones... includes diamondUnited States Geological Survey (USGS) Mineral Industry Surveys, Aug. 17p.United StatesAnnual review, production, consumption, Economics
DS1999-0757
1999
United States Geological Survey (USGS)United States Geological Survey (USGS)Industrial diamond. 1998 annual reviewUnited States Geological Survey (USGS) Mineral industry surveys, August, 9p.United States, GlobalDiamond - industrial, markets, production
DS2000-0964
2000
United States Geological Survey (USGS)United States Geological Survey (USGS)Diamond ( industrial)United States Geological Survey (USGS) Mineral Commodities Summaries, Feb. p. 58-59.GlobalEconomics, Industrial diamond
DS2000-0965
2000
United States Geological Survey (USGS)United States Geological Survey (USGS)Mineral industry surveys- gemstones. 1999 annual review. includes brief diamonds.United States Geological Survey (USGS) Mineral Surveys, Oct. 16p.United StatesEconomics, Diamond
DS2000-0966
2000
United States Geological Survey (USGS)United States Geological Survey (USGS)Mineral industry surveys- industrial diamond. 1999 annual reviewUnited States Geological Survey (USGS) Mineral Surveys, Oct. 8p.United StatesEconomics, Industrial diamond
DS2001-1173
2001
United States Geological Survey (USGS)United States Geological Survey (USGS)Gemstones. Diamond and other gemstones. 2000 Mining Annual reviewMineral Industry Surveys, 17p.GlobalEconomics, Diamonds
DS2001-1174
2001
United States Geological Survey (USGS)United States Geological Survey (USGS)Industrial diamond. 2000 Annual reviewMineral Industry Surveys, 9p.United StatesEconomics, Industrial diamonds
DS1989-1529
1989
United States Minerals YearbookUnited States Minerals YearbookMinerals Yearbook 1987Vol. II Area reports: Domestic and Vol. IIIInternationalU.s. Minerals Yearbook, 439p, 1164pUnited States, GlobalBook: ad, Minerals Yearbook
DS1900-0472
1907
United States MonthlyUnited States MonthlyGermans Hunt for a Diamond Field Near Ichoufu #1United States Monthly Consular And Trade Report., No. 326, Nov., PP. 196-197.China, Shandong, TsingtauHistory, Diamond Occurrence
DS1997-1182
1997
University of ArizonaUniversity of ArizonaProceedings of the High Resolution Geophysics Workshop available only onCD-ROM.University of Arizona, $ 45.00GlobalBook - ad, Geophysics workshop - high resolution
DS2001-0380
2001
University of LeedsGETECH, University of LeedsSouth American gravity and magnetic dat a packagesGetech Advertisement, South AmericaGravity and magnetic data
DS1995-1943
1995
University of Minnesota DuluthUniversity of Minnesota DuluthPetrology and metallogeny of volcanic and intrusive rocks of The midcontinent rift system #2University of Minnesota, Duluth, Aug. 19-Sept. 1MinnesotaConference -ad, Midcontinent, tectonics, metallogeny
DS1995-1944
1995
University of Western AustraliaUniversity of Western AustraliaGeoconferences workshop on kimberlites, lamproites and diamondsKey Centre, held Feb. 15, 16th., 150p.GlobalWorkshop -see separate authors, Kimberlites, lamproites, diamonds
DS200912-0028
2009
Unnikrishnan, P.Balakrishnan, T.S., Unnikrishnan, P., Murty, A.V.S.The tectonic map of India and contiguous areas.Journal of the Geological Society of India, Vol. 74, August pp. 158-170.IndiaMap - tectonics
DS201811-2615
2015
Unninayar, C.Unninayar, C.In search of Colombia's green dreams.InColor, December pp. 21-31.South America, Colombiaemeralds
DS200712-0036
2007
Uno, H.Audet, P., Jellinek, A.M., Uno, H.Mechanical controls on the deformation of continents at convergent margins.Earth and Planetary Science Letters, Vol. 264, 1-2, pp. 151-166.MantleTectonics
DS202008-1428
2020
Unoki, K.Nishiyama, T., Ohfuji, H., Fukuba, K., Terauchi, M., Nishi, U., Harada, K., Unoki, K., Moribe, Y., Yoshiasa, A., Ishimaru, S., Mori, Y., Shigeno, M., Arai, S.Microdiamond in a low grade metapelite from a Cretaceous subduction complex, western Kyushu, Japan. ( UHP) Nishisonogi unitNature Scientific Reports, Vol. 10, 11645 11p. PdfAsia, Japanmicrodiamond

Abstract: Microdiamonds in metamorphic rocks are a signature of ultrahigh-pressure (UHP) metamorphism that occurs mostly at continental collision zones. Most UHP minerals, except coesite and microdiamond, have been partially or completely retrogressed during exhumation; therefore, the discovery of coesite and microdiamond is crucial to identify UHP metamorphism and to understand the tectonic history of metamorphic rocks. Microdiamonds typically occur as inclusions in minerals such as garnet. Here we report the discovery of microdiamond aggregates in the matrix of a metapelite from the Nishisonogi unit, Nagasaki Metamorphic Complex, western Kyushu, Japan. The Nishisonogi unit represents a Cretaceous subduction complex which has been considered as an epidote-blueschist subfacies metamorphic unit, and the metapelite is a member of a serpentinite mélange in the Nishisonogi unit. The temperature condition for the Nishisonogi unit is 450 °C, based on the Raman micro-spectroscopy of graphite. The coexistence of microdiamond and Mg-carbonates suggests the precipitation of microdiamond from C-O-H fluid under pressures higher than 2.8 GPa. This is the first report of metamorphic microdiamond from Japan, which reveals the hidden UHP history of the Nishisonogi unit. The tectonic evolution of Kyushu in the Japanese Archipelago should be reconsidered based on this finding.
DS1992-1585
1992
Unrug, R.Unrug, R.The supercontinent cycle and Gondwanaland assembly: component cratons And the timing of suturing eventsJournal of Geodynamics, Vol. 16, No. 4, December pp. 215-240GlobalGondwanaland,, Tectonics, World
DS1992-1586
1992
Unrug, R.Unrug, R.Laurentia and Salvador-Congo: keystone cratons in Late Proterozoic break-up of Rodinia and assembly of Gondwana supercontinentGeological Society of America (GSA) Abstracts with programs, 1992 Annual, Vol. 24, No. 7, abstract p. A115GlobalTectonics, Supercontinent
DS1992-1587
1992
Unrug, R.Unrug, R.Contrasting tectonic regions of the Gondwana supercontinent: eastern Gondwana continent, western Gondwana cratons and mobile belts, Pacific marginbeltsEos Transactions, Vol. 73, No. 14, April 7, supplement abstracts p.364GondwanaCraton, Supercontinent
DS1993-1317
1993
Unrug, R.Rogers, J.J.W., Unrug, R., Sultan MohammedReport of workshop on the assembly of GondwanaPreprint from authors, 64pGlobalTectonics, Gondwana, Supercontinent cycle in earth's history
DS1993-1318
1993
Unrug, R.Rogers, J.J.W., Unrug, R., Sultan, M.Report of the workshop on the assembly of GondwanaWorkshop Preprint, 64p.MantleSupercontinent cycle, Earth history
DS1994-1476
1994
Unrug, R.Rogers, J.J.W., Unrug, R., Sultan, M.Tectonic assembly of GondwanaJournal of Geodynamics, Vol. 19, No. 1, pp. 1-34GondwanaTectonics, Supercontinent
DS1994-1815
1994
Unrug, R.Unrug, R.Neoproterozoic contrasting histories of east and west GondwanaGeological Society of Australia Abstracts, No. 37, p. 438-9.GondwanaBrief overview
DS1994-1816
1994
Unrug, R.Unrug, R., Gresse, P., Wolmarana, L.Geodynamic map of Gondwana supercontinent assembly #1Geological Society of Australia Abstracts, No. 37, p. 440-1.GondwanaBrief overview
DS1995-1591
1995
Unrug, R.Rogers, J.J., Unrug, R., Sultan, M.Tectonic assembly of GondwanaJournal of Geodynamics, Vol. 19, No. 1, pp. 1-34.GondwanaTectonics, Pangea assembly
DS1996-1451
1996
Unrug, R.Unrug, R.Geodynamic map of Gondwana Supercontinent assembly #2Geological Society of America, Abstracts, Vol. 28, No. 7, p. A-494.GondwanaGeodynamics
DS1997-1183
1997
Unrug, R.Unrug, R.Geodynamic map of Gondwana supercontinent assemblyFrench Geological Survey (BRGM)., maps - 4 sheets approx. $ 50.00GondwanaMap - ad, Geodynamics
DS1997-1184
1997
Unrug, R.Unrug, R.Rodinia to Gondwana: the geodynamic map of Gondwana supercontinentassembly.Gsa Today, Vol. 7, No. 1, Jan. pp. 1-7.GondwanaSupercontinent, Map - see ad $ 50.00 United States
DS1990-1097
1990
Unruh, D.M.Nealey, D.L., Unruh, D.M., Knight, R.J.Geochemistry of deep crustal xenoliths from the southern Colorado Plateau Northern ArizonaGeological Society of America (GSA) Abstracts with programs, Cordilleran, Vol. 22, No. 3, p. 72Colorado Plateau, ArizonaXenoliths, Geochemistry
DS1993-1130
1993
Unruh, D.M.Nielson, J.E, mBudahn, J.R., Unruh, D.M., Wilshire, H.G.Actualistic models of mantle metasomatism documented in a composite xenolith from Dish Hill, California.Geochemica et Cosmochimica Acta, Vol. 57, No. 1, January pp. 105-121.CaliforniaMantle, Dish Hill
DS200512-1109
2005
Unruh, J.Unruh, J., Cligget, L., Hay, R.Migrant land rights reception and 'clearing to claim' in sub Saharan Africa.Natural Resources Forum, Vol. 29, 3, August pp. 190-198.Africa, southern AfricaNews item - legal, aboriginal
DS1998-0704
1998
Unruh, J.R.Jones, C.H., Sonder, L.J., Unruh, J.R.Lithospheric gravitational potential energy and past orogenesis:implications for conditions - deformation..Geology, Vol. 26, No. 7, July pp. 639-642.Colorado, WyomingLaramide Orogeny, deformation, Mantle
DS1998-1501
1998
Unruh, J.R.Unruh, J.R., Twiss, R.J.Coseismic growth of basement involved anticles: the North ridge Laramideconnection.Geology, Vol. 26, No. 4, Apr. pp. 335-338.Colorado, WyomingGeophysics - seismics, Thrust faults, uplifts, structure, Laramide Orogeny
DS2002-1085
2002
Unruh, J.R.Moores, E.M., Wakabayashi, J., Unruh, J.R.Crustal scale cross section of the U.S. Cordillera, California and beyond, its tectonic significance and speculations on the Andean Orogeny.International Geology Review, Vol. 44, 6, pp. 479-500.United States, CaliforniaTectonics
DS201710-2271
2017
Unsworth, J.Unsworth, J.Diamond aggregate sorting apparatus. ( recognizes boart from a gemstone).Materials World Magazine , Patent but.ly/2ss32Q4 1p.Technologysorting machine
DS200412-2023
2004
Unsworth, M.Unsworth, M., Wenbo, W., Jones, A.G., Li, S., Bedrosian, P., Booker, J., Sheng, J., Ming, D., Handong, T.Crustal and upper mantle structure of northern Tibet imaged with magnetotelluric data.Journal of Geophysical Research, Vol. 109, B2, Feb. 13, 10.1029/2002 JB002305Asia, TibetTectonics, geophysics - seismics
DS200912-0778
2009
Unsworth, M.Tukroglu, E., Unsworth, M., Pana, D.Deep electrical structure of northern Alberta ( Canada): implications for diamond exploration.Canadian Journal of Earth Sciences, Vol. 46, 2, pp. 139-154.Canada, AlbertaGeophysics - magnetotellurics
DS201804-0752
2018
Unsworth, M.Wang, E., Unsworth, M., Chacko, T.Geoelectric structure of the Great Slave Lake shear zone in northwest Alberta: implications for structure and tectonic history.Canadian Journal of Earth Sciences, Vol. 55, pp. 295-307.Canada, Albertageophysics - electromagnetics, magnetotellurics

Abstract: The study of ancient plate boundaries can provide insights into the past and present-day tectonic processes. Here, we describe a magnetotellurics (MT) study of the Precambrian basement of the Hay River Fault (HRF) in northwest Alberta, which is the southwest segment of the Great Slave Lake shear zone. New broadband MT data were collected to give a clearer image of the crustal structure. The Western Canada Sedimentary Basin was imaged as a low-resistivity layer above the resistive crystalline basement. Four basement conductors were defined, and correlate with the terrane boundaries delineated with aeromagnetic data. These are (1) a major conductor in the Kiskatinaw domain, (2) a conductor on the boundary of the Ksituan and Chinchaga domains, (3) a conductor on the boundary of the Chinchaga and Buffalo Head domains, and (4) a conductor near the HRF. Both (1) and (2) correspond to areas of high seismic reflectivity. The low resistivity can be explained by interconnected grain boundary graphite or sulfide phases deposited by metamorphic fluid migration. The HRF was not definitively located in previous studies. The new data show that the HRF could be thin (1 km) or wide (10 km) and located at the boundary of the contrasting aeromagnetic anomalies or further to the north. Various tectonic processes are proposed to interpret the possible locations of the HRF. No electrical anisotropy structure is required to interpret the MT data in this study.
DS200512-1034
2005
Unsworth, M.J.Spratt, J.E., Jones, A.G., Nelson, K.D., Unsworth, M.J., INDEPTH MT TeamCrustal structure of the India - Asia collision zone, southern Tibet, from INDEPTH MT investigations.Physics of the Earth and Planetary Interiors, India, Asia, TibetGeophysics, EM and magnetotelluric
DS201112-0475
2011
Unsworth, M.J.Jamieson, R.A., Unsworth, M.J., Harris, N.B.W., Rosenberg, C.L., Schulmann, K.Crustal melting and the flow of mountains.Elements, Vol. 7, 4, August pp. 253-260.Mantle, AsiaCrustal deformation - weakening
DS201412-0739
2013
Unsworth, M.J.Rippe, D., Unsworth, M.J., Currie, C.A.Magnetotelluric constraints on the fluid content in the upper mantle beneath the southern Canadian Cordillera: implications for rheology.Journal of Geophysical Research, Vol. 118, 10, pp. 5601-5624.Canada, British ColumbiaGeophysics - tellurics
DS201412-0434
2014
Unswrth, M.J.Jones, A.G., Ledo, J., Ferguson, I.J., Craven, J.A., Unswrth, M.J., Chouteau, M., Spratt, J.E., Enkin, R.The electrical resistivity of Canada's lithosphere and correlation with other parameters: contributions from lithoprobe and other programmes.Canadian Journal of Earth Sciences, Vol. 51, 6, pp. 573-617.CanadaGeophysics
DS201212-0496
2010
Untemehr, P.Moulin, M., Aslanian, D., Untemehr, P.A new starting point for the South and Equatorial Atlantic Ocean.Earth Science Reviews, Vol. 98, 1-2, pp. 1-37.South America, AfricaIntraplate deformation
DS201412-0149
2014
Unterborn, C.Cottaar, S., Heister, T., Rose, I., Unterborn, C.BurnMan: a lower mantle mineral physics toolkit.Geochemistry, Geophysics, Geosystems: G3, Vol. 15, 4, pp. 1164-1179.MantleTechnology
DS1988-0720
1988
Unternehr, P.Unternehr, P., Curie, D., Olivet, J.L., Goslin, J., Beuzart, P.South Atlantic fits and intraplate boundaries in Africa andSouthAmericaTectonophysics, Vol. 155, No. 1-4, Dec. 1, pp. 169-180Africa, South AmericaTectonics
DS2002-1288
2002
UnzogPuti, M., Korikovsky, Wallbrecher, Unzog, Olesen, FritzEvolution of an eclogitized continental fragment in the Eastern Alps ( Sieggraben Austria).Journal of Structural Geology, Vol. 24, No. 1, pp. 339-57.AustriaEclogites
DS200612-1449
2006
Upadhyay, D.Upadhyay, D., John-Awe, S., Pin, C., Paquette, J.L., Braun, I.Neoproterozoic alkaline magmatism at Sivamalai, southern India.Gondwana Research, Vol. 10, 1-2, August pp. 156-166.IndiaAlkalic
DS200612-1450
2006
Upadhyay, D.Upadhyay, D., Raith, M.M.Petrogenesis of the Kunavaram alkaline complex and the tectonothermal evolution of the neighbouring Eastern Ghats Belt granulites SE India.Precambrian Research, in press - availableIndiaAlkaline rocks, geochemistry, geochronology
DS200612-1451
2006
Upadhyay, D.Upadhyay, D., Raith, M.M., Mezger, K., Bhattacharya, A., Kinny, P.D.Mesoproterozoic rifting and Pan African continental collision in SE India: evidence from the Khariar alkaline complex.Contributions to Mineralogy and Petrology, Vol. 141, 4, April pp. 434-456.Asia, IndiaTectonics
DS200612-1452
2006
Upadhyay, D.Upadhyay, D., Raith, M.M., Mezger, K., Hammerschmidt, K.Mesoproterozoic rift related alkaline magmatism at Elchuru, Prakasam alkaline province, SE India.Lithos, Vol. 89, 3-4, July pp. 447-477.IndiaBasanites, Tectonics, magmatism, Eastern Gnats Belt
DS200812-1192
2008
Upadhyay, D.Upadhyay, D.Alkaline magmatism along the southeastern margin of the Indian shield: implications for regional geodynamics and constraints on craton-eastern Ghats belt suturing.Precambrian Research, Vol. 162, 1-2, pp. 59-69.IndiaCraton
DS201012-0650
2010
Upadhyay, D.Saha, L., Pant, N.C., Pati, J.K., Upadhyay, D., Berndt, J., Bhattacharya, A., Satynarayanan, M.Neoarchean high pressure margarite phengite muscovite chlorite corona mantle corundum in quartz free high Mg, Al phlogopite chlorite schists from the BundelkhandContributions to Mineralogy and Petrology, in press available, 20p.IndiaCraton, U H metamorphism
DS201507-0338
2015
Upadhyay, D.Upadhyay, D., Kooijman, E., Singh, A.K., Mezger, K., Berndt, J.The basement of the Deccan Traps and its Madagascar connection: constraints from xenoliths.Journal of Geology, Vol. 123, pp. 295-310.Africa, MadagascarXenoliths
DS201707-1300
2017
Upadhyay, D.Ackerman, L., Magna, T., Rapprich, V., Upadhyay, D., Kratky, O., Cejkova, B., Erban, V., Kochergina, Y.V., Hrstka, T.Contrasting petrogenesis of spatially related carbonatites from Samalpatti and Sevattur, Tamil Nadu, India.Lithos, Vol. 284-285, pp. 257-275.Indiacarbonatite - Samalpatti, Sevattur

Abstract: Two Neoproterozoic carbonatite suites of spatially related carbonatites and associated silicate alkaline rocks from Sevattur and Samalpatti, south India, have been investigated in terms of petrography, chemistry and radiogenic–stable isotopic compositions in order to provide further constraints on their genesis. The cumulative evidence indicates that the Sevattur suite is derived from an enriched mantle source without significant post-emplacement modifications through crustal contamination and hydrothermal overprint. The stable (C, O) isotopic compositions confirm mantle origin of Sevattur carbonatites with only a modest difference to Paleoproterozoic Hogenakal carbonatite, emplaced in the same tectonic setting. On the contrary, multiple processes have shaped the petrography, chemistry and isotopic systematics of the Samalpatti suite. These include pre-emplacement interaction with the ambient crustal materials with more pronounced signatures of such a process in silicocarbonatites. Calc-silicate marbles present in the Samalpatti area could represent a possible evolved end member due to the inability of common silicate rocks (pyroxenites, granites, diorites) to comply with radiogenic isotopic constraints. In addition, Samalpatti carbonatites show a range of C–O isotopic compositions, and d13CV-PDB values between + 1.8 and + 4.1‰ found for a sub-suite of Samalpatti carbonatites belong to the highest values ever reported for magmatic carbonates. These heavy C–O isotopic signatures in Samalpatti carbonatites could be indicative of massive hydrothermal interaction with carbonated fluids. Unusual high-Cr silicocarbonatites, discovered at Samalpatti, seek their origin in the reaction of pyroxenites with enriched mantle-derived alkali-CO2-rich melts, as also evidenced by mantle-like O isotopic compositions. Field and petrographic observations as well as isotopic constraints must, however, be combined with the complex chemistry of incompatible trace elements as indicated from their non-uniform systematics in carbonatites and their individual fractions. We emphasise that, beside common carriers of REE like apatite, other phases may be important for incompatible element budgets, such as mckelveyite–(Nd) and kosmochlor, found in these carbonatites. Future targeted studies, including in-situ techniques, could help further constrain temporal and petrologic conditions of formation of Sevattur and Samalpatti carbonatite bodies.
DS201709-2026
2017
Upadhyay, D.Magna, T., Wittke, A., Gussone, N., Rapprich, V., Upadhyay, D.Calcium isotope composition of carbonatites - a case study of Sevattur and Samalpatti, S. India.Goldschmidt Conference, abstract 1p.Indiacarbonatites

Abstract: Calcium isotope compositions are presented for two suites of carbonatites and associated alkaline silicate rocks from Neoproterozoic Sevattur and Samalpatti complexes in Tamil Nadu, South India. Despite their geographic proximity, the mean G44/40Ca values are different for Sevattur (G44/40Ca = 0.69 r 0.10‰, n = 7) and Samalpatti (0.81 r 0.16‰, n = 5). The former suite is derived from an enriched mantle source without significant post-emplacement modifications [1] and its Ca isotope composition falls to the lower end of Ca isotope range reported for mantle-derived rocks [2]. Some carbonatites from Samalpatti show a 44Ca-enriched signature which could reflect large-scale low-temperature modification, recognized also by their 13C–18O-enriched isotope systematics and sizeable loss of REE, when compared to pristine carbonatites from the area [1]. This is also consistent with albite–epidote metasomatic sample and shistose pyroxenite from Samalpatti, both showing a 44Ca-depleted signature. Leaching experiments confirm a systematic G44/40Ca offset with isotopically light carbonate relative to bulk sample [also 3]. Pyroxenites from Samalpatti are isotopically heavier than accompanying unmodified carbonatites and their G44/40Ca values fall into the mantle range. In contrast, pyroxenite and phosphate from Sevattur have a G44/40Ca value identical with associated carbonatites, indicating a homogeneous mantle source for the latter complex. For K-rich syenites and monzonites, 40K-decay corrections need to be considered for the intrinsic mass-dependent isotope fractionations considering the Neoproterozoic age and high K/Ca character of some samples.
DS201709-2067
2017
Upadhyay, D.Upadhyay, D., Ranjan, S., Abhinay, K., Pruseth, K.L., Nanda, J.K.India-Antarica connection: constraints from deformed alkaline rocks and carbonatites.Goldschmidt Conference, abstract 1p.Indiacarbonatites

Abstract: Deformed Alkaline Rocks and Carbonatites (DARCs) are markers of suture zones where continents have rifted apart and later amalgamated [1]. Petrological and geochronological data indicates that parts of India and East Antarctica may have been involved in several episodes of collision and breakup during the assembly of past supercontinents [2]. DARCs at the eastern margin of the Eastern Ghats Province (EGP) in India preserve the record of these amalgamation and breakup events. It is thought that the Napier Complex of East Antarctica collided with the Dharwar Craton of India at ca. 1.60 Ga forming the central and eastern Indian shield [3]. New zircon U-Pb ages from DARCs at the EGP margin show that the alkaline complexes (Kamakhyanagar: 1350±14 Ma Rairakhol: 1379±6 Ma; Khariar: 1478±5 Ma; Koraput: 1387±34 Ma; Kunavaram: 1360±5 Ma; Jojuru: 1352±6 Ma) were emplaced in a narrow time interval. The alkaline magmatism marks an episode of rifting in the Indo-Antarctic continental fragment, correlatable with breakup of the Columbia supercontinent. Metamorphic zircon from the alkaline rocks furnish age populations at 917-950 Ma, 792- 806 Ma and 562-569 Ma. The 917-950 Ma ages are correlated with the closure of an oceanic basin between the Ruker Terrane of East Antarctica and the Indian Shield during the assembly of the Rodinia supercontinent. This led to the collision of the Ruker Terrane with the combined India-Napier Complex producing the Grenville-age EGPRayner Complex orogen [2, 3]. The 792-806 Ma ages record the disintegration of Rodinia when Greater India started to break away from East Antarctica [4]. In the early Paleozoic, India reconverged towards Antarctica and Australia during Gondwanaland assembly. The 562-569 Ma zircon ages date the resulting collisions during Pan-African orogenesis.
DS201710-2209
2017
Upadhyay, D.Ackerman, L., Slama, J., Haluzova, E., Magna, T., Rapprich, V., Kochergin, Y., Upadhyay, D.Hafnium isotope systematics of carbonatites and alkaline silicate rocks from south and west India.Goldschmidt Conference, 1p. AbstractIndiadeposit - Amba Dongar
DS201710-2272
2017
Upadhyay, D.Upadhyay, D., Ranjan, S., Abhinay, K., Pruseth, K.L., Nanda, J.K.India-Antarctica connection: constraints from deformed alkaline rocks and carbonatites.Goldschmidt Conference, 1p. AbstractIndiacarbonatites

Abstract: Re-Os and platinum group element analyses are reported for peridotite xenoliths from the 533 Ma Venetia kimberlite cluster situated in the Limpopo Mobile Belt, the Neoarchaean collision zone between the Kaapvaal and Zimbabwe Cratons. The Venetian xenoliths provide a rare opportunity to examine the state of the cratonic lithosphere prior to major regional metasomatic disturbance of Re-Os systematics throughout the Phanerozoic. The 32 studied xenoliths record Si-enrichment that is characteristic of the Kaapvaal lithospheric mantle and can be subdivided into five groups based on Re-Os analyses. The most pristine group I samples (n = 13) display an approximately isochronous relationship and fall on a 3.28 ± 0.17 Ga (95 % conf. int.) reference line that is based on their mean TMA age. This age overlaps with the formation age of the Limpopo crust at 3.35-3.28 Ga. The group I samples derive from ~50 to ~170 km depth, suggesting coeval melt depletion of the majority of the Venetia lithospheric mantle column. Group II and III samples have elevated Re/Os due to Re addition during kimberlite magmatism. Group II has otherwise undergone a similar evolution as the group I samples with overlapping 187Os/188Os at eruption age: 187Os/188OsEA, while group III samples have low Os concentrations, unradiogenic 187Os/188OsEA and were effectively Re-free prior to kimberlite magmatism. The other sample groups (IV and V) have disturbed Re-Os systematics and provide no reliable age information. A strong positive correlation is recorded between Os and Re concentrations for group I samples, which is extended to groups II and III after correction for kimberlite addition. This positive correlation precludes a single stage melt depletion history and indicates coupled remobilisation of Re and Os. The combination of Re-Os mobility, preservation of the isochronous relationship, correlation of 187Os/188Os with degree of melt depletion and lack of radiogenic Os addition puts tight constraints on the formation and subsequent evolution of Venetia lithosphere. First, melt depletion and remobilisation of Re and Os must have occurred within error of the 3.28 Ga mean TMA age. Second, the refractory peridotites contain significant Re despite recording >40 % melt extraction. Third, assuming that Si-enrichment and Re-Os mobility in the Venetia lithospheric mantle were linked, this process must have occurred within ~100 Myr of initial melt depletion in order to preserve the isochronous relationship. Based on the regional geological evolution, we propose a rapid recycling model with initial melt depletion at ~3.35 Ga to form a tholeiitic mafic crust that is recycled at ~3.28 Ga, resulting in the intrusion of a TTG suite and Si-enrichment of the lithospheric mantle. The non-zero primary Re contents of the Venetia xenoliths imply that TRD model ages significantly underestimate the true depletion age even for highly depleted peridotites. The overlap of the ~2.6 Ga TRD ages with the time of the Kaapvaal-Limpopo collision is purely fortuitous and has no geological significance. Hence, this study underlines the importance of scrutiny if age information is to be derived from whole rock Re-Os analyses.
DS201801-0001
2017
Upadhyay, D.Ackerman, L., Magna, T., Rapprich, V., Upadhyay, D., Kratky, O., Cejkova, B., Erban, V., Kochergina, Y.V., Hrstka, T.Contrasting petrogenesis of spatially related carbonatites from Samalpatti and Sevattur, Tamil Nadu, India: insights from trace element and isotopic geochemistry.Carbonatite-alkaline rocks and associated mineral deposits , Dec. 8-11, abstract p. 31-33.Indiadeposit - Samalpatti, Sevattur

Abstract: The Tamil Nadu region in southern India hosts several carbonatite bodies (e.g., Hogenakal, Samalpatti, Sevattur, Pakkanadu-Mulakkadu) which are closely associated with alkaline silicate rocks such as syenites, pyroxenites or dunites (e.g, Kumar et al., 1998; Schleicher et al., 1998; Srivastava, 1998). This is in contrast to the carbonatite occurrences in north-western India associated with the Deccan Trap basalts (e.g., Amba Dongar) or Proterozoic Newania dolomitic carbonatites. We have studied two, spatially related, Neoproterozoic carbonatite-silico(carbonatite) suites in association with alkaline silicate rocks (e.g., pyroxenite, gabbro) from Sevattur and Samalpatti in terms of petrography, chemistry and radiogenic-stable isotopic compositions in order to provide constraints on their genesis and evolution. In these two bodies, several different carbonatite types have been reported previously with striking differences in their trace element and isotopic compositions (Srivastava, 1998; Viladkar and Subramanian, 1995; Schleicher et al., 1998; Pandit et al., 2002). Collected data for previously poorly studied calcite carbonatites from the Sevattur representing the first carbonatite magmas on this locality, indicate similar geochemical characteristics to those of dolomitic carbonatites, such as high LREE/HREE ratios, very high Sr and Ba contents, large amounts of apatite and magnetite, identical Sr-Nd-C-O isotopic compositions. Thus, they were derived from an enriched mantle source without significant post-emplacement modifications through crustal contamination and hydrothermal overprint, in agreement with previous studies (e.g., Schleicher et al., 1998). Detailed microprobe analyses revealed that high levels of some incompatible elements (e.g., REE, Y, Sr, Ba) cannot be accounted by matrix calcite hosting only significant amounts of SrO (~0.6-1.2 wt.%). On the other hand, abundant micro- to nano-scale exsolution lamellae and/or inclusions of mckelveyite-(Nd) appear to host a significant fraction of LREE in parallel with apatite. Distribution of Sr is most likely influenced also by common but heterogeneously dispersed barite and strontianite. Newly acquired as well as detailed inspection of available geochemical data permits distinguish two different types of carbonatites in Samalpatti: (1) Type I similar to Sevattur carbonatites in terms of mineralogy, trace element and radiogenic-stable isotopic compositions and (2) Type II with remarkably low concentrations of REE and other incompatible trace elements, more radiogenic Sr isotopic compositions and extremely variable C–O isotopic values. The petrogenesis of the Type II seems to be intimately associated with the presence of silicocarbonatites and abundant silicate mineral domains. Instead of liquid immiscible separation from a silicate magma, elevated SiO2 contents observed in silico-carbonatites may have resulted from the interaction of primary carbonatitic melts and crustal rocks prior to and/or during magma emplacement. Arguments for such hypothesis include variable, but radiogenic Sr isotopic compositions correlated with SiO2 and other lithophile elements (e.g., Ti, Y, Zr, REE). Calc-silicate marbles present in the Samalpatti area could represent a possible evolved crustal end member for such process due to the inability of common silicate rocks (pyroxenites, granites, diorites) to comply with radiogenic isotopic constraints. The wide range of C-O isotopic compositions found in Samalpatti carbonatites belong to the highest values ever reported for magmatic carbonates and can be best explained by massive hydrothermal interaction with carbonated fluids. Unusual high-Cr silicocarbonatites were discovered at Samalpatti forming centimetre to decimetre-sized enclaves enclosed in pyroxenites with sharp contacts at hand specimen scale. Detailed microprobe analyses revealed peculiar chemical compositions of the Mgamphibole with predominantly sodic composition embaying and replacing Na-Cr-rich pyroxene (kosmochlor), accompanied by the common presence of Cr-spinel and titanite. Such association have been reported for hydrous metasomatism by Na-rich carbonatitic melts at upper mantle conditions (Ali and Arai, 2013). However, the mineralogy and the mode of occurrence of Samalpatti Mg–-r-rich silicocarbonatites argue against such origin. We explain the petrogenesis of these rocks through the reaction of pyroxenites with enriched mantle-derived alkali-CO2-rich melts, as also evidenced by mantle-like O and Hf isotopic compositions.
DS201801-0035
2017
Upadhyay, D.Magna, T., Rapprich, V., Wittke, A., Gussone, N., Upadhyay, D., Mikova, J., Pecskay, Z.Calcium isotope systematics and K-Ar and U-Pb temporal constraints on the genesis of Sevattur Samalpatti carbonatite silicate alkaline complexes.Carbonatite-alkaline rocks and associated mineral deposits , Dec. 8-11, abstract p. 34-35.Indiadeposit - Samalpatti, Sevattur

Abstract: We present the first systematic survey of Ca isotope compositions in carbonatites and associated silicate rocks from Samalpatti and Sevattur, two Neoproterozoic complexes in Tamil Nadu, south India. Despite their close geographic proximity, their genesis and post-emplacement histories differ (Ackerman et al. 2017). The Sevattur complex appears to have been derived from an enriched mantle source with a limited post-magmatic disturbance. In contrast, carbonatites from Samalpatti show a record of extensive late-stage post-magmatic overprint, also apparent from unusually heavy C-O isotope compositions in a sub-suite of carbonatites (Ackerman et al. 2017). The mean d44/40Ca = 0.69 ± 0.10‰ is slightly lighter than the average of fertile, unmetasomatized peridotites at d44/40Ca = 0.95 ± 0.05‰ (Kang et al. 2017). This difference may attest to the general difference between carbonates and silicates (see Kang et al. 2017). It could also reflect Ca isotope fractionation between isotopically heavy silicate and isotopically light carbonate (e.g., John et al. 2012), though to a somewhat minor extent. This is supported by leaching experiments in this study where the extent of silicate-carbonate fractionation (44/40Casilicate-carbonate) has been investigated. The values at ~0.1-0.2‰ are expectedly lower than those reported earlier (~0.6‰; John et al. 2012) and may reflect high-temperature Ca isotope fractionation. The variability in d44/40Ca values of carbonatites and silico-carbonatites from the Samalpatti complex is larger (0.70- 1.14‰) and appears to be in accord with extensive post-emplacement disturbance. Significant loss of REE and 13C-18O-enriched signature are combined with high ?44/40Ca values, which could reflect massive exchange with metasomatic aqueous fluids. The 40Kdecay correction was applied to K-rich rocks (syenites, monzonites). Given the antiquity of the complex dated at ca. ~800 Ma (Schleicher et al. 1997) and considering high-K/Ca character of some rocks, the resulting d44/40Ca800 Myr correction was up to ~+1.2‰. In this regard, it is crucial to constrain the age history of the entire region. The nearby Hogenakal carbonatite body was dated at ~2.4 Ga which is much older than Rb-Sr and Sm-Nd age of Sevattur (Kumar et al. 1998) from the same fault system. We have acquired K-Ar mineral (K-feldspar, biotite, amphibole) and U-Pb zircon data from Sevattur and Samalpatti. The K-Ar ages span a range between ~800 and ~510 Ma (~800 Ma for amphiboles and biotites from silico-carbonatites and mafic silicate rocks and ~570-510 Ma for K-feldspars and biotites from syenites), dating two high-grade regional tectono-thermal overprint events, documented earlier. The complex nature of this process is indicated by concordant U-Pb zircon age at ~2.5 Ga yielded for a melatonalite, for which K-Ar biotite age of ~802 Ma was measured. This fits into the age bracket of basement of the Eastern Dharwar Craton. The age distribution bimodality at ~2.5 Ga and ~800 Ma has been found for several other samples, suggesting a pulsed thermal history of the area, associated with a significant overprint by fluids likely derived from the local crust. Particularly high U concentrations in zircons (thousands ppm), combined with a range of K-Ar ages, attest to such multi-episodic history.
DS201902-0264
2019
Upadhyay, D.Chakraborty, T., Upadhyay, D., Ranjan, S., Pruseth, K.L., Nanda, J.K.The geological evolution of the Gangpur schist belt, eastern India: constraints on the formation of the greater Indian landmass of the Proterozoic.Journal of Metamorphic Geology, Vol. 37, 1, pp. 113-151.Indiageology

Abstract: The Central Indian Tectonic Zone (CITZ) is a Proterozoic suture along which the Northern and Southern Indian Blocks are inferred to have amalgamated forming the Greater Indian Landmass. In this study, we use the metamorphic and geochronological evolution of the Gangpur Schist Belt (GSB) and neighbouring crustal units to constrain crustal accretion processes associated with the amalgamation of the Northern and Southern Indian Blocks. The GSB sandwiched between the Bonai Granite pluton of the Singhbhum craton and granite gneisses of the Chhotanagpur Gneiss Complex (CGC) links the CITZ and the North Singhbhum Mobile Belt. New zircon age data constrain the emplacement of the Bonai Granite at 3,370 ± 10 Ma, while the magmatic protoliths of the Chhotanagpur gneisses were emplaced at c. 1.65 Ga. The sediments in the southern part of the Gangpur basin were derived from the Singhbhum craton, whereas those in the northern part were derived dominantly from the CGC. Sedimentation is estimated to have taken place between c. 1.65 and c. 1.45 Ga. The Upper Bonai/Darjing Group rocks of the basin underwent major metamorphic episodes at c. 1.56 and c. 1.45 Ga, while the Gangpur Group of rocks were metamorphosed at c. 1.45 and c. 0.97 Ga. Based on thermobarometric studies and zircon-monazite geochronology, we infer that the geological history of the GSB is similar to that of the North Singhbhum Mobile Belt with the Upper Bonai/Darjing and the Gangpur Groups being the westward extensions of the southern and northern domains of the North Singhbhum Mobile Belt respectively. We propose a three-stage model of crustal accretion across the Singhbhum craton - GSB/North Singhbhum Mobile Belt - GC contact. The magmatic protoliths of the Chhotanagpur Gneisses were emplaced at c. 1.65 Ga in an arc setting. The earliest accretion event at c. 1.56 Ga involved northward subduction and amalgamation of the Upper Bonai Group with the Singhbhum craton followed by accretion of the Gangpur Group with the Singhbhum craton-Upper Bonai Group composite at c. 1.45 Ga. Finally, continent-continent collision at c. 0.96 Ga led to the accretion of the CGC with the Singhbhum craton-Upper Bonai Group-Gangpur Group crustal units, synchronous with emplacement of pegmatitic granites. The geological events recorded in the GSB and other units of the CITZ only partially overlap with those in the Trans North China Orogen and the Capricorn Orogen of Western Australia, indicating that these suture zones are not correlatable.
DS201910-2241
2019
Upadhyay, D.Ackerman, L., Polak, L., Magna, T., Rapprich, V., Jana, D., Upadhyay, D.Highly siderophile element geochemistry and Re-Os isotopic systematics of carbonatites: insights from Tamil Nadu, India.Earth and Planetary Science letters, Vol. 520, pp. 175-187.Indiacarbonatites

Abstract: Carbonatite metasomatism has been widely implicated for worldwide mafic mantle suites but so far, no combined data have been available for highly siderophile element systematics (HSE - Os, Ir, Ru, Pt, Pd, Re) and Re-Os isotopic compositions in carbonatites themselves. We present the first systematic survey of the HSE and Re-Os isotopic compositions in a suite of well-characterized Neoproterozoic carbonatites, silicocarbonatites and associated silicate rocks (pyroxenites, monzogabbros, syenites) from south India in order to place constraints on the HSE systematics in carbonatite magmas, anchoring possible mantle sources of carbonatites and relationship to the ambient crustal lithologies as well as preliminary constraints on carbonatite metasomatism in Earth's mantle. The most plausible explanation for generally low HSE contents in calciocarbonatites from Tamil Nadu (?HSE < 1.22 ppb) involves a low-degree (<1%) partial melting of the mantle source producing sulfur-saturated carbonatitic magmas leaving behind sulfide phases retaining HSE. The new data also indicate a strong FeO control on the distribution of Os and Pt during segregation of carbonatite melt from its enriched mantle source and/or melt differentiation. The combined 187Re/188Os values (from 0.10 to 217), 187Os/188Os ratios (0.186-10.4) and initial ?Os values back-calculated to 800 Ma (from +0.1 to +6052) predict that most Tamil Nadu calciocarbonatites were plausibly derived from a carbonated peridotite source with <10% recycled component. This model would thus provide significant constraints on the origin/source of carbonatites, irrespective of their post-emplacement history. The unusual, volumetrically rare, Mg-Cr-rich silicocarbonatites (?HSE = 14-41 ppb) display almost identical HSE patterns with those of host pyroxenites and predominantly high Pt (up to 38 ppb), the origin of which remains unknown. Positive co-variations between Pt, Pd and Re, and the well-developed positive correlation between Pt and MgO in these Mg-Cr-rich silicocarbonatites argue for a source coming predominantly from the upper mantle. The Re-Os isotopic systematics agree with direct incorporation of enriched mantle-derived material into parental melts but variable incorporation of potassium-rich crustal materials is evidenced by highly positive ?Os800 Ma values for a sub-suite of Mg-Cr-rich silicocarbonatites, indicating intense fenitization. The highly radiogenic Os isotopic compositions of monzogabbros and a syenite argue for their derivation from crustal lithologies with no or only negligible contribution of mantle material. Collectively, low Ir, Ru, Pt and Pd contents found in the Tamil Nadu carbonatites appear to indicate the incapability to significantly modify the total budget of these elements in the Earth's mantle during carbonatite metasomatism. In contrast, very high Re/Os ratios found in some of the analyzed carbonatites, paralleled by extremely radiogenic 187Os/188Os signature, can produce large modification of the Re-Os isotopic composition of mantle peridotites during carbonatite melt percolation when high melt/rock ratios are achieved.
DS1992-1588
1992
Upadhyay, O.P.Upadhyay, O.P., Singh, D.P.Effect of discontinuities on the stability of slopes in opencast Mines by equivalent material modelling techniquesInternational Journal of Surface Mining and Reclamation, Vol. 6, pp. 99-102GlobalComputer, Program -open pit
DS1996-1452
1996
Upcott, N.M.Upcott, N.M., Mukasa, R.K., Karner, G.D.Along axis segmentation and isostasy in the western Rift, East AfricaJournal of Geophysics Research, Vol. 101, No. 2, Feb. 10, pp. 3247-68.Tanzania, East AfricaTectonics, Rifting
DS1994-1817
1994
UphereUphereFinding common ground... do diamonds offer solid economic benefits forCanada's north?Uphere, November/December pp. 67-82.Northwest TerritoriesEnvironmental, Economics
DS1995-1945
1995
UphereUphereSorting the diamonds from the roughUpHere, July/August pp. 46-47.Northwest TerritoriesNews item, Kennecott Canada
DS1998-1502
1998
UphereUphereWhen you wish upon a star.... Northerners wonder if that is all thereis.... sorting and valuing too????Uphere, May-June pp. 42-52.Northwest TerritoriesDiamond mining, Diamond evaluation, sorting, cutting
DS1987-0466
1987
UptonMenzies, M.A., Halliday, A.N., Palacz, Z., Hunters, R.H., UptonEvidence from mantle xenoliths for an enriched lithospheric keel under the outer HebridesNature, Vol. 325, January 1, pp. 44-47GlobalMantle xenoliths
DS1989-1008
1989
UptonMenzies, M.A., Halliday, A.N., Hunter, R.H., MacIntyre, R.M., UptonThe age, composition and significance of a xenolith bearing monchiquitedike, Lewis, ScotlandGeological Society of Australia Inc. Blackwell Scientific Publishing, Special, No. 14, Vol. 2, pp. 843-852ScotlandMantle xenoliths
DS2002-1237
2002
UptonPedersen, S. Craig, Upton, TapaniRamo, Jepsen, KalsbeekPaleoproterozoic (1740 Ma) rift related volcanism in the Hekla Sund region, field occurrence, geochemistryPrecambrian Research, Vol. 114, No. 3-4, Mar.15, pp.327-46.Greenland, eastern northTectonics
DS1994-1046
1994
Upton, B.Long, A., Mnzies, M.A., Thirlwall, M., Upton, B., Aspen, P.Carbonatite mantle interaction: a possible origin for megacryst xenolith suite in Scotland.Proceedings of Fifth International Kimberlite Conference, Vol. 1, pp. 467-477.ScotlandCarbonatite
DS200612-0420
2006
Upton, B.Gaffney, A., Upton, B.Ocean Island basalt like source of kimberlite magmas from West Greenland revealed by high 3 He 4He ratios.Geology, Vol.34, 4, April pp. 273-276.Europe, GreenlandGeochronology, Group I
DS200612-1403
2006
Upton, B.Tachibana, Y., Kaneoka, I., Gaffney, A., Upton, B.Ocean Island basalt like source of kimberlite magmas from West Greenland revealed by high 3He 4He ratios.Geology, Vol. 34, 4, pp. 273-276.Europe, GreenlandMagmatism - kimberlite mineral chemistry
DS201012-0398
2009
Upton, B.Kohler, J., Schonenberger, J., Upton, B., Markl, G.Halogen and trace element chemistry in the Gardar Province, South Greenland: subduction related mantle metasomatism and fluid exsolution from alkalic melts.Lithos, Vol. 113, pp. 731-747.Europe, GreenlandMetasomatism
DS201604-0617
2016
Upton, B.Ladenburger, S., Marks, M.A.W., Upton, B., Hill, P., Wenzel, T., Markl, G.Compositional variation of apatite from rift related alkaline igneous rocks of the Gardar Province, South Greenland.American Mineralogist, Vol. 101, pp. 612-626.Europe, GreenlandAlkalic

Abstract: Textural and compositional variations of apatite from four intrusions with different characteristic features of the rift-related alkaline Gardar Province were investigated: dyke rocks that belong to the most primitive rocks of the Province (Isortoq), nepheline-syenites associated with a carbonatite (Grønnedal-Ika), SiO2-saturated and SiO2-oversaturated syenites (Puklen) and nepheline-syenites displaying the transition from miaskitic to agpaitic mineral assemblages (Motzfeldt, Fig.1). Additionally, apatites from these intrusions were compared with other apatites of the Gardar Province. These include apatites from the Older Giant Dyke Complex, the Younger Giant Dyke Complex (both from the Tugtutôq region) and a narsarsukite-bearing trachytic dyke (Igdlutalik), as well as apatites from the Kûngnât, the North Qôroq and the Ilímaussaq intrusive complexes. This results in a complete overview of rift-related magmatites of the Gardar Province, ranging from primitive to highly evolved rocks. Backscattered electron images reveal the presence of various types of apatite textures including (i) growth zonation (concentric and oscillatory) that formed during magmatic differentiation and (ii) overgrowth and secondary textures (rounded cores, patchy zonation and overgrowth rims) due to fluid/melt induced metasomatic overprint and intracrystalline diffusion (Fig.2). Additionally, apatite compositions were analyzed with wavelength-dispersive electron microprobe analyses. During the crystallization history of the different intrusions, as well as within samples (documented by zoning patterns), increasing concentrations are observed for Si, REE, Na and F, whereas Cl shows a decreasing trend. However, for F, Cl and Na these trends are only observed in dyke rocks. Compositional variation of the investigated apatites is mainly due to substitution of Ca and P by variable amounts of Si, Na and REE. This study reveals that variations in the chemical composition of apatite are useful tools to obtain geochemical information about the host magma and its magmatic evolution. Here, Si and REE were found to be reliable petrogenetic indicators, whereas Na, F and Cl are only applicable in fast cooling systems to avoid redistribution of those elements.
DS1988-0136
1988
Upton, B.F.Collerson, K., Hearm, B.C., Macdonald, R.A., Upton, B.F., Park, J.G.Granulite xenoliths from the Bearpaw Mountains,Montana: constraints on the character and evolution of lower continental crustTerra Cognita, Eclogite conference, Vol. 8, No. 3, Summer, p. 270. AbstractMontanaXenoliths, Bearpaw Mountains
DS1998-0951
1998
Upton, B.G.Marty, B., Upton, B.G., Ellam, R.M.Helium isotopes in early Tertiary basalts, northeast Greenland: evidence for 59 Ma plume activity ...Geology, Vol. 26, No. 5, May pp. 407-410.GlobalMagmatism, plumes, Geochronology
DS2001-1175
2001
Upton, B.G.Upton, B.G., Aspen, P., Hinton, R.W.Pyroxenite and granulite xenoliths from beneath: evidence for lower crust/upper mantle....Contribution Mineralogy Petrology, Vol. 142, No. 2, pp. 178-97.ScotlandXenoliths
DS2002-0187
2002
Upton, B.G.Bonadiman, C., Coltorti, M., Upton, B.G.Metasomatised mantle peridotites from beneath the Northern Highlands Terrane, Scotland.18th. International Mineralogical Association Sept. 1-6, Edinburgh, abstract p.150.ScotlandPeridotites
DS2003-1398
2003
Upton, B.G.Upton, B.G., Emeleus, C.H., Heaman, L.M., Goodenough, K.M., Finch, A.A.Magmatism of the mid-Proterozoic Gardar Province, South Greenland: chronologyLithos, Vol. 68, 1-2, pp. 43-65.GreenlandMagmatism
DS200412-2024
2003
Upton, B.G.Upton, B.G., Emeleus, C.H., Heaman, L.M., Goodenough, K.M., Finch, A.A.Magmatism of the mid-Proterozoic Gardar Province, South Greenland: chronology, petrogenesis and geological setting.Lithos, Vol. 68, 1-2, pp. 43-65.Europe, GreenlandMagmatism
DS1984-0748
1984
Upton, B.G.J.Upton, B.G.J., Aspen, P., Hunter, R.H.Xenoliths and Their Implications for the Deep Geology of The Midland Valley of Scotland and Adjacent Regions.Transactions Royal Society. EDINBURGH, EARTH SCIENCES SECTION., Vol. 75, PT. 2, PP. 65-70.ScotlandPetrology, Garnet Pyroxenite
DS1985-0190
1985
Upton, B.G.J.Fitton, J.G., Upton, B.G.J.Alkaline Igneous Rocks: a Review SymposiumGeological Society of London Journal, Vol. 142, PP.GlobalConference Report
DS1985-0191
1985
Upton, B.G.J.Fitton, J.G., Upton, B.G.J.Alkaline Igneous Rocks and Carbonatites of Paraguay.Episodes, Vol.8, No. 1, MARCH PP. 56-57.GlobalConference Report, Lamproite, Large-ion Lithophile Elements (lile), Review
DS1985-0690
1985
Upton, B.G.J.Upton, B.G.J., Emeleus, C.H.The Gardar Alkaline Province, South GreenalndConference Report of The Meeting of The Volcanics Studies Gr, 1P. ABSTRACT.GreenlandGeochemistry, Petrology, Isotope
DS1987-0212
1987
Upton, B.G.J.Fitton, F.G., Upton, B.G.J.Alkaline igneous rocksBlackwell: Geol. Society Special Paper No.28, 900pEast AfricaGreenland, Cameroons
DS1987-0305
1987
Upton, B.G.J.Hunter, R.H., Upton, B.G.J.The British Isles- a Paleozoic mantle samplein: Mantle xenoliths, editor P.H. Nixon, pp. 107-118Globalp. 111 Host rock composition basalt, basanite, monchiquit, p. 113-116 mineral chemis
DS1989-0279
1989
Upton, B.G.J.Collerson, K.D., MacDonald, R.A., Upton, B.G.J., Harmon, R.S.Composition and evolution of lower continental crust:evidence from xenoliths in Eocene lavas from the Bearpaw Mountains, MontanaNew Mexico Bureau of Mines Bulletin., Continental Magmatism Abstract Volume, Held, Bulletin. No. 131, p. 57. AbstractMontanaXenoliths
DS1989-0608
1989
Upton, B.G.J.Hearn, B.C.Jr., Collerson, K.D., MacDonald, R.A., Upton, B.G.J.Mantle crustal lithosphere of north central Montana,USA: evidence fromxenolithsNew Mexico Bureau of Mines Bulletin., Continental Magmatism Abstract Volume, Held, Bulletin. No. 131, p. 125. AbstractMontanaXenoliths
DS1989-1530
1989
Upton, B.G.J.Upton, B.G.J.Magmatic evolution of a mid-Proterozoic continentalrift: Giant dykes, dykes, and ring complexes of the Tugtutoq linament, S. GreenlandNew Mexico Bureau of Mines Bulletin., Continental Magmatism Abstract Volume, Held, Bulletin. No. 131, p. 275. AbstractGreenlandTectonics, Dykes-ring dykes
DS1989-1531
1989
Upton, B.G.J.Upton, B.G.J.Alkali magmatism in Labrador and S. Greenland: Evidence for an originally contiguous alkaline igneous province in the Mid- Proterozoic continentGeological Association of Canada (GAC) Annual Meeting Program Abstracts, Vol. 14, p. A49. (abstract.)Labrador, GreenlandAlkaline rocks
DS1990-1523
1990
Upton, B.G.J.Volker, J.A., Upton, B.G.J.The structure and petrogenesis of the Trallval and Ruinsival areas of the Rhum ultrabasic complex.Transactions Royal Society. Edinburgh Earth Sci., Vol 81, pp. 69-88.GlobalLayered intrusion, Periodite, troctolite
DS1991-0694
1991
Upton, B.G.J.Hearn, B.C.Jr., Collerson, K.D., Upton, B.G.J., Macdonald, R.A.Ancient enriched upper mantle beneath north-central Montana: evidence fromxenolithsGuidebook of the Central Montana Alkalic Province, ed. Baker, D.W., Berg. R., No. 100, pp. 133-135. extended abstractMontanaMantle, xenoliths
DS1991-1009
1991
Upton, B.G.J.Long, A., Thirwall, M.F., Menzies, M.A., Upton, B.G.J., Aspen, P.Geochemical systematics in mantle megacrysts and their host basalts From the Archean craton and post Archean mobile belts of ScotlandProceedings of Fifth International Kimberlite Conference held Araxa June 1991, Servico Geologico do Brasil (CPRM) Special, pp. 241-244ScotlandLoch Raog Lewis, xenolith, mica megacryst, Dunaksin Glen, Kiers Hill, Elie Ness, Colonsay, cpx megacry
DS1991-1771
1991
Upton, B.G.J.Upton, B.G.J.Gardar mantle xenoliths: Igdlutalik, South GreenlandGronlands Geol. Unders. Rapp, No. 150, pp. 37-43GreenlandMantle, Xenoliths
DS1992-0970
1992
Upton, B.G.J.Macdonald, R., Upton, B.G.J., Collerson, K.D., Hearn, B.C.Potassic mafic lavas of the Bearpaw Mountains, Montana-mineralogy, chemistry and origin ( review)Journal of Petrology, Vol. 33, No. 2, April pp. 305-346MontanaPotassic magmatism, Bearpaw Mountains
DS1992-1589
1992
Upton, B.G.J.Upton, B.G.J., Mitchell, R.H., Long, A., Aspen, P.Primitive olivine melanephelinite dykes from the Orkney Islands, SOURCE[ Geology MagazineGeology Magazine, Vol. 129, No. 3, May pp. 319-324ScotlandMelanephelinite, Orkney Islands
DS1993-1195
1993
Upton, B.G.J.Paslick, C.R., Halliday, A.N., Davies, G.R., Mezger, K., Upton, B.G.J.Timing of Proterozoic magmatism in the Gardar Province, southernGreenland.Geological Society of America Bulletin, Vol. 105, No. 2, February pp. 272-278.GreenlandAlkaline rocks, Ilmaussaq Complex
DS1994-1692
1994
Upton, B.G.J.Stevenson, R.K., Upton, B.G.J., Currie, K.samarium-neodymium (Sm-Nd) isotopic evolution of the peralkaline Red Wine and Ilimaussaq intrusive complexes.Geological Association of Canada (GAC) Abstract Volume, Vol. 19, p.LabradorGeochronology, Red Wine, Ilimaussaq
DS1998-0390
1998
Upton, B.G.J.Ellam, R.M., Upton, B.G.J., Fitton, J.G.Petrogenesis of late stage magmatism at Hold with Hope, East GreenlandContributions to Mineralogy and Petrology, Vol. 133, No. 1-2, pp. 51-59.GreenlandMagmatism, Petrology
DS1999-0138
1999
Upton, B.G.J.Coltorti, M., Nonadiman, C., Upton, B.G.J.Carbonatite metasomatism of the Oceanic upper mantle: evidence from clinopy roxenes and glasses... xenolithsJournal of Petrology, Vol. 40, No. 1, Jan. 133-Indian OceanGrande Comore area, Ultramafic xenoliths
DS1999-0758
1999
Upton, B.G.J.Upton, B.G.J., Hinton, R.W., Valley, J.W.Megacrysts and associated xenoliths: evidence for migration of geochemically enriched melts upper mantleJournal of Petrology, Vol. 40, No. 6, June 1, pp. 935-56.MantleGeochemistry, Xenoliths
DS2000-0687
2000
Upton, B.G.J.Morogan, V., Upton, B.G.J., Fitton, J.G.The petrology of the Ditrau alkaline complex, Eastern CarpathiansMineralogy and Petrology., Vol. 69, No. 3-4, pp. 227-66.Europe, UralsAlkaline complex
DS2001-1176
2001
Upton, B.G.J.Upton, B.G.J., Aspen, P., Hinton, R.W.Pyroxenite and granulite xenoliths from beneath the Scottish Northern Highlands Terrane: evidence....Contributions to Mineralogy and Petrology, Vol. 142, No. 2, Nov. pp. 178-97.ScotlandXenoliths, Lower crust upper mantle relationship
DS2002-0593
2002
Upton, B.G.J.Goodeneough, K.M., Upton, B.G.J., Ellam, R.M.Long term memory of subduction processes in the lithospheric mantle: evidence from geochemistry of basic dykes in the Gardar Province of South Greenland.Journal of the Geological Society of London, Vol. 159, 6, pp. 705-714.GreenlandBlank
DS2002-0595
2002
Upton, B.G.J.Goodenough, K.M., Upton, B.G.J., Ellam, R.M.Long tern memory of subduction processes in the lithospheric mantle: evidence from theJournal of the Geological Society of London, Vol. 159, 6, pp. 705-14.GreenlandTectonics - subduction
DS2003-1399
2003
Upton, B.G.J.Upton, B.G.J., Aspen, P., Hinton, R.W.Garnet pyroxenite xenoliths and pyropic megacrysts in Scottish alkali basaltsScottish Journal of Geology, Vol. 39, No. 2, pp. 169-184.ScotlandMineralogy
DS2003-1400
2003
Upton, B.G.J.Upton, B.G.J., Emeleus, C.H., Heaman, L.M., Goodenough, K.M., Finch, A.A.Magmatism of the mid-Proterozoic Gardar Province, south Greenland: chronologyLithos, Vol. 68, May, pp. 43-65.GreenlandDyke swarms, basalts
DS200412-0477
2004
Upton, B.G.J.Downes, H., Macdonald, R., Upton, B.G.J., Cox, K.G., Bodinier, J-L., Mason, P.R.D., James, D., Hill, P.G., HeaUltramafic xenoliths from the Bearpaw Mountains, Montana: USA: evidence for multiple metasomatic events in the lithospheric mantJournal of Petrology, Vol. 45, 8, pp. 1631-1662.United States, MontanaMetasomatism
DS200412-0694
2002
Upton, B.G.J.Goodenough, K.M., Upton, B.G.J., Ellam, R.M.Long tern memory of subduction processes in the lithospheric mantle: evidence from the geochemistry of basic dykes in the Gardar Province of South Greenland.Journal of the Geological Society, Vol. 159, 6, pp. 705-714.Europe, GreenlandSubduction - geochemistry
DS200412-2025
2003
Upton, B.G.J.Upton, B.G.J., Aspen, P., Hinton, R.W.Garnet pyroxenite xenoliths and pyropic megacrysts in Scottish alkali basalts.Scottish Journal of Geology, Vol. 39, no. 2, pp. 169-184.Europe, ScotlandMineralogy
DS200412-2026
2003
Upton, B.G.J.Upton, B.G.J., Emeleus, C.H., Heaman, L.M., Goodenough, K.M., Finch, A.A.Magmatism of the mid-Proterozoic Gardar Province, south Greenland: chronology, petrogenesis and geological setting.Lithos, Vol. 68, May, pp. 43-65.Europe, GreenlandDyke swarms, basalts
DS200512-1110
2005
Upton, B.G.J.Upton, B.G.J., Ramo, O.T., Heaman, L.M., Blichert-Toft, J., Kalsbeek, F., Barry, T.L., Jepsen, H.F.The Mesoproterozoic Zig-Zag Dal basalts and associated intrusions of eastern North Greenland: mantle plume lithosphere interaction.Contributions to Mineralogy and Petrology, Vol. 149, 1, pp. 40-56.Europe, GreenlandTectonics
DS200612-1453
2006
Upton, B.G.J.Upton, B.G.J., Craven, J.A., Kirstein, L.A.Crystallization of mela-aillikites of the Narsaq region, Gardar alkaline province, south Greenland and relationships to other aillikitic carbonatitic assoc.Lithos, in press availableEurope, GreenlandCarbonatite, melilite lamprophyres, metasomatism
DS200712-1100
2006
Upton, B.G.J.Upton, B.G.J., Craven, J.A., Kirstein, L.A.Crystallisation of mela-allikites of the Narsaq region, Gardar alkaline province, south Greenland and relationships to other allikitic carbonatitic associateLithos, Vol. 92, 1-2, Nov, pp. 300-319.Europe, GreenlandCarbonatite
DS201012-0807
2010
Upton, B.G.J.Upton, B.G.J., Finch, A.A., Slaby, E.Megacrysts and salic xenoliths in Scottish alkali basalts: derivatives of deep crustal intrusions and small melt fractions from the upper mantle.Mineralogical Magazine., Vol, 73, 6, Dec. pp. 943-956.Europe, ScotlandXenoliths
DS201312-0928
2013
Upton, B.G.J.Upton, B.G.J., Macdonald, R., Odling, N., Ramo, O.T., Baginski, B.Kungnaat, revisited. A review of five decades of research into an alkaline complex in South Greenland, with new trace element and Nd isotopic data.Mineralogical Magazine, Vol. 77, 4, pp. 523-550.Europe, GreenlandKungnaat
DS201412-0130
2014
Upton, B.G.J.Clay, P.L., O'Driscoll, B., Upton, B.G.J., Busemann, H.Characteristics of djerfisherite from fluid rich metasomatized alkaline intrusive environments and anhydrous enstatite chrondrites and achondrites.American Mineralogist, Vol. 99, pp. 1683-93.MantleDjerfisherites
DS201511-1822
2015
Upton, B.G.J.Bartels, A., Nielsen, T.F.D., Lee, S.R.G.J., Upton, B.G.J.Petrological and geochemical characteristics of Mesoproterozoic dyke swarms in the Gardar Province, south Greenland: evidence for a major sub-continental lithospheric mantle component in the generation of the magmas.Mineralogical Magazine, Vol. 79, 4, pp. 909-939.Europe, GreenlandDike swarms

Abstract: The Mesoproterozoic Gardar Province in South Greenland developed in a continental rift-related environment. Several alkaline intrusions and associated dyke swarms were emplaced in Archaean and Ketilidian basement rocks during two main magmatic periods at 1300-1250 Ma and 1180-1140 Ma. The present investigation focuses on mafic dykes from the early magmatic period (‘Older Gardar’) and the identification of their possible mantle sources. The rocks are typically fine- to coarse-grained dolerites, transitional between tholeiitic and alkaline compositions with a general predominance of Na over K. They crystallized from relatively evolved, mantle-derived melts and commonly show minor degrees of crustal contamination. Selective enrichment of the large ion lithophile elements Cs, Ba and K and the light rare-earth elements when compared to high field-strength elements indicate significant involvement of a sub-continental lithospheric mantle (SCLM) component in the generation of the magmas. This component was affected by fluid-dominated supra-subduction zone metasomatism, possibly related to the Ketilidian orogeny ~500 Ma years prior to the onset of Gardar magmatism. Melt generation in the SCLM is further documented by the inferential presence of amphibole in the source region, negative calculated eNd(i) values (-0.47 to -4.40) and slightly elevated 87Sr/86Sr(i) (0.702987 to 0.706472) ratios when compared to bulk silicate earth as well as relatively flat heavy rare-earth element (HREE) patterns ((Gd/Yb)N = 1.4-1.9) indicating melt generation above the garnet stability field. The dyke rocks investigated show strong geochemical and geochronological similarities to pene-contemporaneous mafic dyke swarms in North America and Central Scandinavia and a petrogenetic link is hypothesized. Considering recent plate reconstructions, it is further suggested that magmatism was formed behind a long-lived orogenic belt in response to back-arc basin formation in the time interval between 1290-1235 Ma.
DS201809-2039
2018
Upton, B.G.J.Hutchison, M.T., Faithfull, J.W., Barfod, D.N., Hughes, J.W., Upton, B.G.J.The mantle of Scotland viewed through the Glen Gollaidh aillikite.Mineralogy and Petrology, doi.org/10.1007/ s00710-018-0610-y 18p.Europe, Scotlandaillikite

Abstract: The Glen Gollaidh aillikite dyke (58.36741°N 4.69751°W), N.W. Scotland, occurs within the Neoproterozoic sedimentary rocks of the Moine Supergroup ~4 km east of the Moine Thrust. Phlogopite 40Ar/36Ar measurements give a late Devonian maximum emplacement age of 360.3?±?4.9 (2s) Ma. This age occurs in a quiet period of Scottish magmatic history c. 30 Ma after the closure of the Iapetus and before the start of intra-plate alkali magmatism which affected southern Scotland for ~60 My from c. 350 Ma. Abundant chromites and Cr-diopsides and a few unaltered olivines, reflecting a mantle provenance, were recovered from heavy mineral concentrates. The North Atlantic Craton, exposed in Lewisian gneisses west of the Moine thrust, is therefore inferred to extend east at depth under Glen Gollaidh, presenting an opportunity to investigate the thickness and composition of the cratonic margin in the Devonian. The aillikite was found to be barren of diamond and no picro-ilmenites or garnets were definitively identified. However, mineral chemistry suggests that a proportion of Glen Gollaidh xenocrysts crystallised in equilibrium with garnet. Most spinels are Mg, Al chromites, with some Mg chromite present. All fall within the garnet peridotite field based on Ti and Cr but with insufficient Cr2O3 (up to 47.2 wt%) to be consistent with the diamond stability field. Amongst Cr-diopsides 30% of grains have Cr and Al contents consistent with derivation from garnet peridotite. The majority of clinopyroxenes also show a marked depletion in heavy compared to light rare-earth elements, again consistent with equilibration with garnet. The opx-cpx solvus thermometer demonstrates that average Cr-diopside compositions require at least 37 kbar to give a temperature (979 °C) lying even on a relatively warm 40 mWm-2 geotherm (Hasterok and Chapman Earth Planet Sc Lett 307:59-70, 2011). Large variations in the chemistry of mantle minerals reflect a complex history of metasomatism akin to constituents of alkali igneous rocks elsewhere in the Hebridean and Northern Highlands Terranes. Fertilised mantle provided the conditions for generation of aillikite melts, probably triggered by break-off of the advancing Avalonia slab. The cratonic root underlying the Glen Gollaidh aillikite during the late Devonian was apparently too thin to lie within the diamond stability field, consistent with xenoliths from alkali basalts further south. Nonetheless, sufficient geophysical and mineral chemical evidence supports Glen Gollaidh aillikite sitting close to the edge of diamond-prospective mantle therefore suggesting diamond potential a short distance to the west within the Lewisian and what is now East Greenland.
DS1987-0213
1987
Upton, B.G.K.Fitton, J.G., Upton, B.G.K.Alkaline igneous rocks. Index -diatremesBlackwell scientific, cont'd. 148, 151, 156, 166-7, 191, 193, 198, 215, 284, 539, 19-25GlobalKimberlite
DS1960-0889
1967
Upton, B.G.L.Upton, B.G.L.Alkaline PyroxenitesJohn Wiley And Sons. Publishing, PP. 281-288.United States, Gulf Coast, Arkansas, Hot Spring CountyMagnet Cove, Petrology
DS1992-1590
1992
Upton, B.J.Upton, B.J., Mitchell, R.H., Long, A., Aspen, P.Primitive olivine melanephelinite dykes from the Orkney Islands, ScotlandGeological Magazine, Vol. 129, No. 3, pp. 319-324.ScotlandNephelinite, Petrology
DS201412-0235
2014
Upton, B.J.G.Faithfull, J.W., Hughes, J., Upton, B.J.G., Ellam, R.M., Ntaflos, T.An aillikite dyke from Sutherland, Scotland.Volcanic and Magmatic Studies Group meeting, Poster Held Jan. 6-8. See minsoc websiteEurope, ScotlandAillikite
DS200812-0120
2008
Upton, BGJ.Boanadiman, C., Coltari, M., Duggen, S., Paludetti, L., Siena,F.,Thirwall, M.F., Upton, BGJ.Paleozoic subduction related and kimberlite or carbonatite metasomatism in the Scottish lithospheric mantle.Geological Society of London, Special Publications no. 293, pp. 303-334.Europe, ScotlandSubduction
DS1995-1946
1995
Urabe, T.Urabe, T., et al.The effect of magmatic activity on hydrothermal venting along the superfast spreading East Pacific RiseScience, Vol. 269, Aug. 25, pp. 1092-1095MantlePlumes, Magmatism
DS200712-1101
2007
Urakaev, F.K.Urakaev, F.K., Shevchenko, V.S., Logvinoa, A.M., Madyukov, I.A., Petrushin, E.I., Yusupov,T.S.Sobolev.Mechano chemical processing of low grade diamond into nanocomposite materials.Doklady Earth Sciences, Vol. 415, 5, pp. 755-758.RussiaMining - mineral processing
DS200412-2027
2004
Urakaev, F.Kh.Urakaev, F.Kh., Palyanov, Yu.N., DShevchenko, V.S., Sobolev, N.V.Abrasive reactive Mechano chemical synthesis of cohenite with the application of diamond.Doklady Earth Sciences, Vol. 394, 2, pp. 214-218.TechnologyPetrology - experimental
DS201012-0651
2009
Urakawa, S.Sakamaki, T., Ohtani, E., Urakawa, S., Suzuki, A., Katayama, Y.Density of dry peridotite magma at high pressure using an x-ray absorption method.American Mineralogist, Vol. 95, pp. 144-147.TechnologyUHP
DS201112-0901
2011
Urakawa, S.Sakamaki, T., Ohtani, E., Urakawa, S., Terasaki, H., Katayama, Y.Density of carbonated peridotite magma at high pressure using an X-ray absorption method.American Mineralogist, Vol. 96, pp. 553-557.MantleHP
DS201412-0771
2013
Urakawa, S.Sakamaki, T., Suzuki, A., Ohtani, E., Terasaki, H., Urakawa, S.Ponded melt at the boundary between the lithosphere and asthenosphere.Nature Geoscience, Vol. 6, no. 12, pp. 1041-1044.MantleMagmatism - ponding
DS201707-1378
2017
Urann, B.M.Urann, B.M.Fluorine and chlorine in mantle minerals and the halogen budget of the Earth's mantle.Contributions to Mineralogy and Petrology, Vol. 172, 51-Mantleperidotite

Abstract: The fluorine (F) and chlorine (Cl) contents of arc magmas have been used to track the composition of subducted components, and the F and Cl contents of MORB have been used to estimate the halogen content of depleted MORB mantle (DMM). Yet, the F and Cl budget of the Earth’s upper mantle and their distribution in peridotite minerals remain to be constrained. Here, we developed a method to measure low concentrations of halogens (=0.4 µg/g F and =0.3 µg/g Cl) in minerals by secondary ion mass spectroscopy. We present a comprehensive study of F and Cl in co-existing natural olivine, orthopyroxene, clinopyroxene, and amphibole in seventeen samples from different tectonic settings. We support the hypothesis that F in olivine is controlled by melt polymerization, and that F in pyroxene is controlled by their Na and Al contents, with some effect of melt polymerization. We infer that Cl compatibility ranks as follows: amphibole > clinopyroxene > olivine ~ orthopyroxene, while F compatibility ranks as follows: amphibole > clinopyroxene > orthopyroxene = olivine, depending on the tectonic context. In addition, we show that F, Cl, Be and B are correlated in pyroxenes and amphibole. F and Cl variations suggest that interaction with slab melts and fluids can significantly alter the halogen content of mantle minerals. In particular, F in oceanic peridotites is mostly hosted in pyroxenes, and proportionally increases in olivine in subduction-related peridotites. The mantle wedge is likely enriched in F compared to un-metasomatized mantle, while Cl is always low (<1 µg/g) in all tectonic settings studied here. The bulk anhydrous peridotite mantle contains 1.4–31 µg/g F and 0.14–0.38 µg/g Cl. The bulk F content of oceanic-like peridotites (2.1–9.4 µg/g) is lower than DMM estimates, consistent with F-rich eclogite in the source of MORB. Furthermore, the bulk Cl budget of all anhydrous peridotites studied here is lower than previous DMM estimates. Our results indicate that nearly all MORB may be somewhat contaminated by seawater-rich material and that the Cl content of DMM could be overestimated. With this study, we demonstrate that the halogen contents of natural peridotite minerals are a unique tool to understand the cycling of halogens, from ridge settings to subduction zones.
DS1940-0103
1945
Urbain, E.Urbain, E.Les Gisements Diamantiferes de L'aefBulletin. ETUD. INF. SECT. CONGOLAND A.I. MONS., No. 11, PP. 59-61.Democratic Republic of Congo, Central AfricaGabon, Brazzaville, Diamond Deposits
DS201312-0929
2012
Urban, L.Urban, L.GIS Bringing geosciences together for enhanced business results.GIS Mining Conference held Perth Australia De Beers presentation by permission, Dec., 23 ppt.TechnologyGIS
DS1996-1453
1996
Uren, C.Uren, C.The Walgundu agreement: paving the wayAustralian Institute of Mining and Metallurgy (AusIMM) Bulletin, No. 8, Dec. pp. 12-13AustraliaLegal - aboriginal, CRA.
DS1980-0332
1980
Uren, D.Uren, D.Negri Wants Report AiredThe Age (melbourne), Dec. 4TH.Australia, Western AustraliaNegri River, Diamonds
DS1981-0414
1981
Uren, D.Uren, D.Endeavour in Open: $ 52m Northern OfferThe Age (melbourne), JULY 8TH. P. 1.Australia, Western AustraliaEndeavour Resources, Investment, Shares
DS1981-0415
1981
Uren, D.Uren, D.Ashton Team Recovers Diamonds Below SurfaceThe Age (melbourne), JULY 10TH.Australia, Western AustraliaSampling, Ak 1, Pipe, Prices
DS201112-1064
2011
Urgulov, V.Urgulov, V., Griffin, W.L., O'Reilly, S.Y.Lithospheric mantle evolution beneath northeast Australia.Lithos, Vol. 125, pp. 405-422.AustraliaMantle lherzolite xenoliths, linkage
DS1995-1947
1995
Uribe-Cifuentes, R.M.Uribe-Cifuentes, R.M., Urrutia Fcugauchi, J.Lower crustal xenoliths from the Valle de Santiago Maar field, crustal structure and tectonic implications.Geological Society of America (GSA) Abstracts, Vol. 27, No. 6, abstract p. A 392.MexicoXenoliths
DS1998-1503
1998
Urosevic, M.Urosevic, M., Evans, B.Seismic methods for the detection of kimberlite pipesAustralian Society of Exploration Geophysicists (ASEG) 13th., Vol. 29, No. 3-4, pp. 632-5.Australia, Northern TerritoryGeophysics - seismics
DS2000-0967
2000
Urosevic, M.Urosevic, M., Evans, B.J.Surface and borehole seismic methods to delineate kimberlite pipes in Australia.The Leading Edge, Vol. 19, No. 7, p. 756.AustraliaGeophysics - seismics
DS1984-0665
1984
Urosov, V.S.Sigalovskaya, YU.I., Sandomirskiy, P.A., Urosov, V.S.Crystallochemistry of MelilititeMineral. Zhur., Vol. 6, No. 2, PP. 3-16.RussiaMelilitite
DS1984-0666
1984
Urosov, V.S.Sigalovskaya, YU.I., Sandomirsky, P.A., Urosov, V.S.The Crystal Chemistry of the MelilitesMineral. Zhurnal., Vol. 6, No. 2, PP. 3-16.RussiaMineral Chemistry
DS1993-0396
1993
Urquhart, J.M.Egan, S.S., Urquhart, J.M.Numerical modelling of lithosphere shortening: application to the Laramide orogenic province, western USATectonophysics, Vol. 221, pp. 385-411WyomingTectonics, Orogeny
DS1990-0127
1990
Urquhart, W.E.S.Arkani-Hamed, J., Urquhart, W.E.S.Reduction to the pole of the North American magnetic anomliesGeophysics, Vol. 55, No. 2, February pp. 218-225MidcontinentGeophysics, Magnetics, gravity
DS1990-0128
1990
Urquhart, W.E.S.Arkani-Hamed, J., Urquhart, W.E.S.Reduction to the pole of the North American magnetic anomaliesGeophysics, Vol. 55, No. 2, February pp. 218-225United States, CanadaGeophysics -magnetics, Crust
DS1993-1633
1993
Urquhart, W.E.S.Urquhart, W.E.S., Hopkins, R.Exploration geophysics and the search for Diamondiferous diatremesProspectors and Developers Diamond Workshop, held March 27th, Toronto, 36p.Canada, GlobalGeophysics, Diatremes, diamond
DS1995-1947
1995
Urrutia Fcugauchi, J.Uribe-Cifuentes, R.M., Urrutia Fcugauchi, J.Lower crustal xenoliths from the Valle de Santiago Maar field, crustal structure and tectonic implications.Geological Society of America (GSA) Abstracts, Vol. 27, No. 6, abstract p. A 392.MexicoXenoliths
DS1993-1064
1993
Urrutia-Fucugauchi, J.Molina-Garza, R., Urrutia-Fucugauchi, J.Deep crustal structure of central Mexico derived from interpretation of Bouguer gravity anomaly dataJournal of Geodynamics, Vol. 17, No. 4, August, pp. 181-203MexicoGeophysics -gravity, Tectonics
DS1996-1454
1996
Urrutia-Fucugauchi, J.Urrutia-Fucugauchi, J., Flores-Ruiz, J.H.Bouguer gravity anomalies and regional crustal structure in centralMexicoInternational Geology Review, Vol. 38, No. 2, Feb. 1, pp. 176-MexicoGeophysics - gravity, Structure
DS201312-0345
2013
Urrutia-Fucugauchi, J.Gulick, S.P.S., Christeson, G.L., Barton, P.J., Grieve, R.A.F., Morgan, J.V., Urrutia-Fucugauchi, J.Geophysical characterization of the Chicxulub impact crater.Reviews of Geophysics, Vol. 51, 1, pp. 31-52.United States, MexicoMeteorite
DS1997-0973
1997
Urrutia-Fugcugauchi, J.Rosas-Elquera, J., Ferrari, L., Urrutia-Fugcugauchi, J.Stratigraphy and tectonics of the Guadalajara region and triple junctionarea, western MexicoInternational Geology Review, Vol. 39 No. 2, Feb. pp. 125-140MexicoTectonics
DS1985-0508
1985
Ursov, A.A.Ostrovskii, E.J., Prokopchuk, B.I., Ursov, A.A.Forecasting by Objectives in Search for KimberlitesDoklady Academy of Sciences AKAD. NAUK SSSR., Vol. 280, No. 3, PP. 705-707.RussiaProspecting
DS1986-0625
1986
Ursov, A.A.Ostrovskiy, E.Ya., Prokopchuk, B.I., Ursov, A.A.Target forecasting in prospecting for kimberlite depositsDokl. Academy of Science Ussr Earth Science Section, Vol. 280, No. 3, pp. 72-73RussiaProspecting
DS201412-0724
2013
Ursule, J-Ph.Rasoamalala, V., Salvi, S., Bexiat, D., Ursule, J-Ph., Cuney, M., De Parseval, Ph., Guillaume, D., Moine, B., Andriamampihantona, J.Geology of bastnaesite and monazite deposits in the Ambatofinandrahana area, central part of Madagascar: an overview.Journal of African Earth Sciences, Vol. 94, 14p.Africa, MadagascarBastanesite
DS202101-0022
2020
Urubek, T.Kropac, K., Dolnicek, Z., Uher, P., Burianek, D., Safai, A., Urubek, T.Zirconian-niobian titanite and associated Zr-, Nb-, REE-rich accessory minerals: products of hydrothermal overprint of leucocratic teschenites ( Sileasian Unit, outer western Carpathians, Czech Republic).Geologica Carpathica ** Eng, Vol. 71, 4, pp. 343-360. pdfEurope, Czech Republicalkaline rocks

Abstract: Sills of hydrothermally altered alkaline magmatic rock (teschenite) of Lower Cretaceous age at the Certák and Repište sites in the Silesian Unit (Flysch Belt of the Outer Western Carpathians, Czech Republic) host leucocratic dykes and nests which contain accessory minerals enriched in Zr, Nb and REE: Zr-, Nb-rich titanite, zircon, gittinsite, pyrochlore, monazite, REE-rich apatite, epidote, and vesuvianite. Titanite forms wedge-shaped crystals or irregular aggregates enclosed in the analcime groundmass or overgrowths on Zr-rich ferropargasite and taramite or Zr-rich aegirine-augite to aegirine. Titanite crystals show oscillatory or irregular patchy to sector zoning and contain up to 17.7 wt. % ZrO2 and 19.6 wt. % Nb2O5, and =1.1 wt. % REE2O3. High-field-strength elements (HFSE) are incorporated into the structure of the studied titanite predominantly by substitutions: (i) [6]Ti4+???[6]Zr4+; (ii) [6]Ti4+?+?[6]Al3+???[6]Zr4+?+?[6]Fe3+; and (iii) [6]2Ti4+???[6]Nb5+?+?[6](Al, Fe)3+. Magmatic fractional crystallization, high-temperature hydrothermal autometasomatic overprint and low-temperature hydrothermal alterations resulted in the formation of the HFSE-rich mineral assemblages within the leucocratic teschenites. Autometamorphic processes caused by high-temperature hypersaline aqueous solutions (salinity ~50 wt. %, ~390-510 °C), which were released from the HFSE-enriched residual melt, played a major role in the crystallization of Zr-, Nb-, and REE-rich minerals. The mobilization of HFSE could have occurred either by their sequestration into a fluid phase exsolved from the crystallizing melt or by superimposed alteration processes. The distinctive positive Eu anomaly (EuCN/Eu*?=?1.85) of leucocratic dykes infers possible mixing of Eu2+-bearing magmatic fluids with more oxidized fluids.
DS202101-0036
2014
Urubek, T.Urubek, T., Dolnicek, Z., Kropac, K.Genesis of syntectonic hydrothermal veins in the igneous rock of teschenite association ( Outer western Carpathians, Czeck Republic): growth mechanisms and origin of fluids. ( REE) ** note dateGeologica Carpathica ** Eng, Vol. 65, 6, pp. 419-431. pdf doi: 10.15 /geoca-2015-0003Europe, Czech Republicalkaline rocks

Abstract: Hydrothermal mineralization hosted by the Lower Cretaceous igneous rock of the teschenite association at Jasenice (Silesian Unit, Flysch Belt, Outer Western Carpathians) occurs in two morphological types - irregular vein filled by granular calcite and regular composite vein formed by both fibrous and granular calcite and minor chlorite, quartz, and pyrite. Crosscutting evidence indicates that the granular veins are younger than the composite vein. The composite vein was formed by two mechanisms at different times. The arrangement of solid inclusions in the marginal fibrous zone suggests an episodic growth by the crack-seal mechanism during syntectonic deformation which was at least partially driven by tectonic suction pump during some stages of the Alpine Orogeny. Both the central part of the composite vein and monomineral veins developed in a brittle regime. In these cases, the textures of vein suggest the flow of fluids along an open fracture. The parent fluids of both types of vein are characterized by low temperatures (Th=66-163 °C), low salinities (0.4 to 3.4 wt. % NaCl eq.), low content of strong REE-complexing ligands, and d18O and d13C ranges of + 0.2/+12.5 %. SMOW and -11.8/-14.1 %. PDB, respectively. The parent fluids are interpreted as the results of mixing of residual seawater and diagenetic waters produced by dewatering of clay minerals in the associ-ated flysch sediments. The flow of fluids was controlled by tectonic deformation of the host rock.
DS1995-0115
1995
Urumov, J.D.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
DS1995-1948
1995
Urumova, G.Urumova, G.Morphogenesis of pyropes, picroilmenites and chromian spinels fromkimberlites, kimberlite like rocks..basaltProceedings of the Sixth International Kimberlite Conference Abstracts, pp. 646-647.Russia, YakutiaMineralogy, Garnet -pyrope
DS1989-1391
1989
Urusov, V.S.Sigalovskaya, Yu. I., Truskinovskiy, L.M., Urusov, V.S.Short range forces in mineral disordering melilite type structuresGeochemistry International, Vol. 26, No. 2, February pp. 16-27RussiaMineral thermometry, Melilite
DS1989-1392
1989
Urusov, V.S.Sigalovskaya, Yu.I., Truskinovskiy, L.M., Urusov, V.S.Short range forces in mineral disordering: mellilite type structuresGeochemistry International, Vol. 26, No. 2, pp. 16-26RussiaMelillite, Mineralogy
DS1991-1583
1991
Urusov, V.S.Sigalovakaya, Yu.I., Truskinovskiy, L.M., Urusov, V.S.Comparison of quasichemical and regular disordering models for minerals with melilite type structuresGeochemistry International, Vol. 28, No. 4, pp. 109-117RussiaMelilite, Geochemistry
DS1993-1634
1993
Urusov, V.S.Urusov, V.S.Crystalline nature of stability of complex minerals, in particular, binary oxides and binary salts.Russian Geology and Geophysics, Vol. 34, No. 12, pp. 84-89.GlobalMineralogy
DS200512-0250
2005
Urusov, V.S.Dudnikova, V.B., Gaister, A.V., Zharikov, E.V., Senin, V.G., Urusov, V.S.Chromium distribution between forsterite and its melt: dependence on chromium content in melt and redox conditions.Geochemistry International, Vol. 43, 5, pp. 471-477.MantleMelting
DS200612-1287
2005
Urusov, V.S.Shiryaev, A.A., Spivak, A.V., Litvin, Yu.A., Urusov, V.S.Formation of nitrogen A defects in diamond during growth in carbonate carbon solutions melts: experiments at 5.5-8.5 GPa.Doklady Earth Sciences, Vol. 403, 6, pp. 908-911.TechnologyExperimental petrology
DS200612-1454
2006
Urusov, V.S.Urusov, V.S., Dudnikova, V.B., Zharikov, E.V.Crystal chemical and energy analysis of partition coefficients of impurities during melt crystallization: the case of olivine.Geochemistry International, Vol. 44, 1, pp. 19-32.MantleMantle melting
DS201412-0866
2013
Urusov, V.S.Solopova, N.A., Litvin, Yu.A., Spivak, A.V., Dubrovinskaia, N.A., Dubrovinsky, L.S., Urusov, V.S.The phase diagram of Na carbonate, an alkaline component of the growth medium of ultradeep diamonds.Doklady Earth Sciences, Vol. 451, 1, pp. 1106-1109.TechnologyUHP
DS200812-1193
2008
US Geological SurveyUS Geological SurveyMineral commodity summaries January 2008 industrial diamond.U.S. Geological Survey, January 2p. pp. 56-57.United StatesIndustrial diamond
DS1993-1635
1993
USBM.USBM.Mineral Commodity SummariesUsbm., 200pUnited StatesTable of contents, Mineral commodity summaries
DS1993-1706
1993
Uschmann, W.Weise, G., Schron, W., Uschmann, W.Trace element contents of rock crystals (Tiefengrubener diamonds) nearBad-Berka(Thuringa). *GER.Neues Jahrbuch fur Mineralogie, (in German), No. 8, August pp. 363-373.GlobalGeochemistry
DS1993-1673
1993
Usenko, A.Yu.Vinnik, L.P., Usenko, A.Yu., akeyeva, L.I., Oreshin, S.I.Strain state of the upper mantle under the USSRDoklady Academy of Sciences USSR, Earth Science Section, Vol. 318, No. 1-6, March 1992 Publishing date pp. 56-61.RussiaMantle, Geophysics
DS201809-2105
2018
Usenko, O.B.Usenko, O.B.Peridoization and specific features of deep processes in Precambrian by example of the Ukrainian shield.Geophysical Journal, Vol. 39, 6, pp. 41-83.Europe, Ukrainegeophysics - cycles

Abstract: Thorough information on geological structure of the Ukrainian shield (USh) allows to verify opinions existing nowadays that plume and plate tectonic activities are possible only after conclusive formation of sublithospheric mantle 2,8—2,55 Ga and plume episodes of Precambrian occurred 2,75—2,7, 2,45—2,4, 1,9, 1.8—1,75, 1,65 Ga ago. It can be proved nowadays that formation of the crust occurred before 4.0 Ga and plume events result in later transformation of not only crust but also of mantle. Isotope dating of the USh allows allocating of plume episodes in close-range time. Nevertheless these limits for the USh in many cases have connection with geological processes, because not detrite zircons are dated but those ones included in rocks. Individual episodes are united into lasting plume events (activizations) up to 3,2, 3,2—2,8, 2,7—2,3, 2,3—1,65 Ga. Special features of the structure of granite-greenstone area of the Middle Dnieper megablock of the USh support the opinion that before 2,7 Ga thick sub-continental lithosphere consisted of refractory peridotite did not exist. Crystallizable layer consists of relatively low-melt minerals and is enriched by basaltoid component. The thickness of crystallized layer reduces up to 100 and 50 km in case of addition of reheated deep matter and increases during crystallization up to 150—200 km. Asthenosphere compulsory contains the melt diluted by silicate-aqueous-carbonate fluide. After 2,7 Ga subdivision of the area into two big blocks occurred. At the mark of the Archean and Proterozoic (2,5 Ga ago) the territory of Ukraine was subdivided into blocks and territories which spatially were drawn towards suture zones. The composition of the terrains allows supposing that at the mark of the Archean and Proterozoic exarticulation of tectonic units where plume processes went in different ways occurred. The following plume event (2,3—2,65 Ga ago) was manifested as a stage of transformation of mantle and crust on all the cratons. In the structure of the USh obvious features of plate tectonic processes have been found. Movements maximal by amplitude occurred 2,0—1,8 Ga ago. During the process of this plume event abrupt change of composition of fluids and melts removed from the mantle occur. Granitization takes place with participation of aqueous chloride-potassium fluids. After granitization active dry carbonate-fluoride-sodium fluids became active. Removal of melts, fluids occurs by small portions and the regime of pulsating plume considerably specifies the composition of magmatic rocks and hydrothermal solutions.
DS1989-1532
1989
Usery, E.L.Usery, E.L., Welch, R.A raster approach to topographic map revisionPhotogrammetric Engineering and Remote Sensing, Vol. LV, No. 1, January pp. 55-60GlobalRemote Sensing, Topography -Raster Format
DS1999-0759
1999
USGSUSGSThe mineral economy of Brasil..Usgs, DD - 53, CD ROMBrazilMineral economy
DS2000-0968
2000
USGSUSGSVenezuelan Guiana ShieldUsgs, DD - CD ROMVenezuelaDigital Data series
DS2000-0969
2000
USGSUSGS, Hearns, P., Hare, Schruber, Sherrill, LaMarGlobal GIS database: digital atlas of Central and South AmericaUsgs, DDS-62-A ( CD ROM)Central America, South AmericaDigital Data series - atlas
DS2001-1177
2001
USGSUSGSGlobal GIS database - digital atlas of South AsiaUsgs, DDS-62-C ( CD ROM)South AsiaDigital Data series - atlas
DS2002-1623
2002
USGSUSGSGemstones,mineral industry surveys... diamonds - production, trade, prices, world review.Usgs Mineral Industry Surveys, 2001 Annual Review, 32p.GlobalEconomics - prices, production, tables, Diamonds
DS2002-1624
2002
USGSUSGSMinerals and materials information.Minerals Yearbook chapters by commodity, country and state 1994-2000.Usgs, CD ROMGlobalMinerals information
DS2002-1625
2002
USGSUSGSUSGS web based newsletter http://minerals.usgs.gov.newsUnknown, GlobalBlank
DS2002-1626
2002
USGSUSGSIndustrial diamond. 2001 annual reviewMineral Industry Surevys, U.S. Geological Survey, 9p.United StatesOverview - industrial diamond, markets
DS200712-1102
2006
USGSUSGS2005 Minerals Yearbook .. diamonds, industrial.U.S. Geological Survey, Sept. 11p.United StatesDiamond - import
DS200512-1219
2004
Ushakov, A.Yiniemi, J., Kozlovskaya, E., Hjelt, S-E., Komminaho, K., Ushakov, A.Structure of the crust and uppermost mantle beneath southern FIn land revealed by analysis of local events registered by the SVEKALAPKO seismic array.Tectonophysics, Vol. 394, 1-2, pp. 41-110.Europe, FinlandGeophysics - seismic, tomography
DS1990-1031
1990
Ushchapo.., Z.F.Menshagin, I.V., Sekerin, A.P., Medvedev, T.I., Ushchapo.., Z.F.Ist find of priderite in kimberlites of the Irutsk Per-Sayan.(Russian)Doklady Academy of Sciences Akademy Nauk SSSR, (Russian), Vol. 312, No. 6, pp. 1440-1442RussiaMineralogy, Priderite
DS2001-0767
2001
UshchapovMedvedev, V.Ya., Ivanova, Egorov, Lashkevich, UshchapovKelyphitic rims around garnet in kimberlites: an experimental studyDoklady, Vol.381A, No.9, Nov-Dec. pp. 1096-98.RussiaKimberlite - garnet mineralogy
DS2002-0421
2002
UshchapovEgorov, K.N., Menshagin, Sekerin, Koshkarev, UshchapovNew dat a on mineralogy of sedimentary reservoirs of diamonds in the southwestern Siberian platform.Doklady, Vol.382, 1, Jan-Feb.pp. 109-11.Russia, SiberiaAlluvials, placers
DS1987-0183
1987
Ushchapovskaya, Z.F.Egorov, K.N., Ushchapovskaya, Z.F., Shy*vyrev, G.G., et al.Hexahydrite in kimberlites of Yakutia (USSR).(Russian)Zap.Vses Mineral. O. Va, (Russian), Vol. 116, No. 6, pp. 718-721RussiaBlank
DS1988-0196
1988
Ushchapovskaya, Z.F.Egorov, K.N., Ushchapovskaya, Z.F., Kashaev, A.A., Bogdanov, G.V.Zemkorite- new carbonate from kimberlites of Yakutia.(Russian)Doklady Academy of Sciences Akademy Nauk SSSR, (Russian), Vol. 301, No. 1, pp. 188-193RussiaUdachanaya
DS1988-0772
1988
Ushchapovskaya, Z.F.Yegorov, N.K., Ushchapovskaya, Z.F., Kashayev, A.A., et al.Zemkorite, a new carbonate from kimberlites of YakutiaDoklady Academy of Science USSR, Earth Science Section, Vol. 301, No. 4, July-Aug. pp. 142-146RussiaMineralogy, Zemkorite
DS1991-0916
1991
Ushchapovskaya, Z.F.Koneva, A.A., Ushchapovskaya, Z.F.Harkerite and buntfolteinite* from the skarns of Tazheran alkaline intrusion (southwestern Baikal region).spelling misinterpreted intranslation?Soviet Geology and Geophysics, Vol. 32, No. 3, pp. 74-77Russia, Lake BaikalAlkaline rocks, Mineralogy
DS200812-1194
2008
Ushikobo, T.Ushikobo, T., Kita, N.T., Cavosie, A.J., Wilde, S.A., Rudnick, R.L., Valley, J.W.Lithium in Jack Hills zircon: evidence for extreme weathering of Earth's crust at 4300 Ma.Goldschmidt Conference 2008, Abstract p.A968.AustraliaWeathering
DS200912-0447
2009
UshikuboLiu, Y., Taylor, L.A., Sarbadhikari, Valley, Ushikubo, Spicuzza, Kita, Ketchum, Carlson, Shatsky, SobolevMetasomatic origin of diamonds in the world's largest Diamondiferous eclogite.Lithos, In press - available 41p.RussiaDeposit - Udachnaya
DS200812-1195
2008
Ushikubo, T.Ushikubo, T., Kita, N.T., Cavosie, A.J., Wilde, S.A., Rudnick, R.L., Valley, J.W.Lithium in Jack Hills zircons: evidence for extensive weathering of Earth's earliest crust.Earth and Planetary Science Letters, Vol. 272, 3-4, pp. 666-676.AustraliaGeochronology, Hadean
DS201412-0938
2014
Ushikubo, T.Valley, J.W., Cavosie, T., Ushikubo, T., Reinhard, D.A., Lawrence, D.F., Larson, D.J., Clifton, P.H., Kelly, T.F., Wilde, S.A., Moser, D.E., Spicuzza, M.J.Hadean age for a post-magma-ocean zircon confirmed by atom-probe tomography.Nature Geoscience, Vol. 7, pp.219-223.MantleGeochronology
DS201509-0434
2015
Ushikubo, T.Valley, J.W., Reinhard, D.A., Cavosie, A.J., Ushikubo, T., Lawrence, D.F., Larson, D.J., Kelly, T.F., Snoeyenbos, D.R., Strickland, A.Nano- and micro-geochronology in Hadean and Archean zircons by atom-probe tomography and SIMS: new tools for old minerals.American Mineralogist, Vol. 100, pp. 1355-1377.AustraliaGeochronology

Abstract: Atom-probe tomography (APT) and secondary ion mass spectrometry (SIMS) provide complementary in situ element and isotope data in minerals such as zircon. SIMS measures isotope ratios and trace elements from 1–20 µm spots with excellent accuracy and precision. APT identifies mass/charge and three-dimensional position of individual atoms (±0.3 nm) in 100 nm-scale samples, volumes up to one million times smaller than SIMS. APT data provide unique information for understanding element and isotope distribution; crystallization and thermal history; and mechanisms of mineral reaction and exchange. This atomistic view enables evaluation of the fidelity of geochemical data for zircon because it provides new understanding of radiation damage, and can test for intracrystalline element mobility. Nano-geochronology is one application of APT in which Pb isotope ratios from sub-micrometer domains of zircon provide model ages of crystallization and identify later magmatic and metamorphic reheating.
DS200912-0781
2009
UshkovUstinov, 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
DS1995-2147
1995
Ushkov, V.V.Zhuravlev, V.A., Shulga, T.F., Ushkov, V.V.Diamond bearing lamproites of the Kostomukshsky region of KareliaMineral Resources of Russia, abstract, Oct. 1994, pp. 37-40.Russia, Karelia, KolaLamproites
DS200812-1196
2008
Ushkov, V.V.Ushkov, V.V., Ustinov, V.N., Smith, C.B., Bulanova, G.P., Lukyanova, L.I., Wiggers de Vries, D., PearsonKimozero, Karelia: a Diamondiferous paleoproterozoic metamorphosed volcaniclastic kimberlite.9IKC.com, 3p. extended abstractRussia, KareliaDeposit - Kimozero
DS1996-1065
1996
Usoltseva, L.M.Panina, L.I., Usoltseva, L.M., Vladykin, N.V.Lamproite rocks of the Yakokut Massif and Upper Yakokut depression (Central Alden).Russian Geology and Geophysics, Vol. 37, No. 6, pp. 13-23.Russia, Aldan shieldLamproite, Yakokut
DS1998-1122
1998
Usoltseva, L.M.Parina, L.I., Usoltseva, L.M.The role of high calcium alkaline sulfate carbonate melts in formation of melilite monticellite rocks..7th. Kimberlite Conference abstract, pp. 655-7.Russia, Aldan shieldAlkaline rocks, Deposit - Malyi Murun Massif
DS2001-0887
2001
Usoltseva, L.M.Panina, L.I., Usoltseva, L.M.The role of liquid immiscibility in the origin of calcite carbonatites from Malyi Murun massif (Aldan)Russian Geology and Geophysics, Vol. 41, No. 5, pp. 633-48.Russia, Aldan shieldCarbonatite, Deposit - Malyi Murun
DS2003-1045
2003
Usoltseva, L.M.Panina, L.I., Stoppa, F., Usoltseva, L.M.Genesis of melilitite rocks of Pian di Celle volcano, Umbrian kamafugite province, Italy:Petrology, Vol. 11, 4, pp. 365-82.ItalyMelilitites
DS200412-1497
2003
Usoltseva, L.M.Panina, L.I., Stoppa, F., Usoltseva, L.M.Genesis of melilitite rocks of Pian di Celle volcano, Umbrian kamafugite province, Italy: evidence from melt inclusions in minerPetrology, Vol. 11, 4, pp. 365-82.Europe, ItalyMelilitite
DS200512-0818
2004
Usoltseva, L.M.Panina, L.I., Usoltseva, L.M.Liquid carbonate carbonate salt immiscibility and origin of calciocarbonatites.Deep seated magmatism, its sources and their relation to plume processes., pp. 209-235.Carbonatite, mineralogy
DS200812-0846
2008
Usoltseva, L.M.Panina, L.I., Usoltseva, L.M.Alkaline ultrabasic mantle derived magmas, their sources, and crystallization features: dat a of melt inclusion studies.Lithos, Vol. 103, 3-4, pp. 431-444.MantleAlkaline rocks, magmatism
DS1975-0306
1976
Usova, L.V.Kepezhinskas, V.V., Lavrentyev, YU.G., Usova, L.V.Eclogites of Subcrustal Zones of Fold SystemsDoklady Academy of Science USSR, Earth Science Section., Vol. 231, No. 1, PP. 131-134.RussiaXenolith, Pyrope, Kimberlite
DS1984-0400
1984
Usova, L.V.Kepezhinskas, V.V., Kepezhinskas, P.K., Usova, L.V.Origin of Camptonites of the Agardag Dike Complex of the Sangilen Highlands of Tuva.Soviet Geology And Geophysics, Vol. 25, No. 4, PP. 51-56.RussiaBlank
DS1987-0399
1987
Usova, L.V.Lavrentev, Yu.G., Usova, L.V., Kuznetsova, A.I., Letov, S.V.Quantiometric x-ray spectral microanalysis of the major minerals ofkimberlites.(Russian)Geologii i Geofiziki, (Russian), No. 5, pp. 75-81RussiaBlank
DS1989-1377
1989
Usova, L.V.Shatskii, V.S., Usova, L.V.Lawsonite inclusions in garnets of eclogites of the Atbashinskii ridge(Kirgiziya)Soviet Geology and Geophysics, Vol. 30, No. 9, pp. 121-125RussiaEclogites, Garnets
DS200512-0601
2005
Usova, L.V.Lavrentev, Y.G., Usova, L.V., Korolyuk, V.N., Logvinova, A.M.Electron probe microanalysis of Cr spinel for zinc and nickel traces as applied to study of the geothermometry of peridotites.Russian Geology and Geophysics, Vol. 46, 7, pp. 725-730.TechnologyPeridotite
DS200612-0772
2006
Usova, L.V.Lavrentev, Yu.G., Korolyuk, V.N., Usova, L.V., Logvinova, A.M.Electron probe microanalysis of pyrope for nickel traces as applied to study of the geothermometry of peridotites.Russian Geology and Geophysics, Vol. 47, 10, pp. 1075-1078.TechnologyPeridotite
DS200612-0773
2005
Usova, L.V.Lavrentev, Yu.G., Usova, L.V., Korolyuk, V.N., Logvinova, A.M.Electron probe microanalysis of Cr spinel for zinc and nickel traces as applied to study of the geothermometry of peridotites.Russian Geology and Geophysics, Vol. 46, 7 pp. 725-730.TechnologyPeridotite - chrome spinel
DS200812-0905
2008
Usova, L.V.Pokhilenko, L.N., Pokhilenko, N.P., Fedorov, L.I., Tomilenko, A.A., Usova, L.V., Fomina, L.N., Sobolev, V.S.Fluid regime pecularities of the lithosphere mantle of the Siberian Platform.Deep Seated Magmatism, its sources and plumes, Ed. Vladykin, N.V., 2008 pp. 122-136.Russia, SiberiaMantle chemistry
DS201510-1782
2015
Usova, L.V.Lavrentev, Yu.G., Karmanov, N.S., Usova, L.V.Electron probe microanalysis of minerals: micranalyzer or scanning electron microscope?Russian Geology and Geophysics, Vol. 56, pp. 1154-1161.TechnologySpectrometry

Abstract: The results of electron probe microanalysis of several rock-forming minerals by wavelength-dispersive spectrometry (WDS) and energy-dispersive spectrometry (EDS) are compared, and the metrological characteristics of both methods are studied. The measurements were made with the use of a JXA-8100 (JEOL) microanalyzer with five wavelength-dispersive spectrometers and a MIRA 3 LMU (Tescan) scanning electron microscope equipped with an INCA Energy 450 XMax 80 (Oxford Instruments) microanalysis system. Specimens with olivine, garnet, pyroxene, ilmenite, and Cr-spinel grains were analyzed. The variation coefficients that characterize the repeatability of a single determination are found to be ~ 0.5% for WDS and ~ 0.9% for EDS in the compositional range of the main components (C > 10%). For minor components (1% < C < 10%), the variation coefficients are 1.4% and 3.0%, respectively, and for impurities (0.3% < C < 1%), 2.7% and 13%, respectively. For lower contents EDS is almost inapplicable. The ratio of the results obtained by the two methods is reproduced with high precision: For major components, the variation coefficient is 0.56%; for minor components, 1.7%; and even for impurities, it is ~ 8%. The magnitude of the bias is between 0.2 and 3.2 rel.%, which is acceptable. The results show that the accuracies of WDS and EDS are similar for measuring major and minor components of rock-forming minerals. Energy-dispersive spectrometry is inferior to wavelength-dispersive spectrometry for impurities and is completely inapplicable for still lower contents. This method is easier to implement, and the results are available soon after switching on the instrument. Wavelength-dispersive spectrometry needs more time for preparation, but it ensures a precise high-efficiency large-scale analysis of samples of similar compositions, even when the element contents are lower than 1%.
DS1990-1513
1990
Usow, K.H.Verhoff, J., Usow, K.H., Roest, W.R.A new method for plate reconstructions: the use of gridded dataComputers and Geosciences, Vol. 16, No. 1, pp. 51-74GlobalComputers, Gridded data sets
DS1990-1514
1990
Usow, K.H.Verhoff, J., Usow, K.H., Roest, W.R.A new method for plate reconstructions: the use of gridded dataComputers and Geosciences, Vol. 16, No. 1, pp. 51-74.GlobalTectonics - plate, Computer - Program
DS1993-0268
1993
Ussami, N.Cogo de Sa, N., Ussami, N., Cassololina, E.Gravity map of Brasil, 1. representation of free air and bougueranomaliesJournal of Geophysical Research, Vol. 98, No. B2, February 10, pp. 2187-2198BrazilGeophysics, Gravity map
DS1993-1116
1993
Ussami, N.Neisi Cogo de Sa, Ussami, N., Cassola, Molina, E.Gravity map of Brasil:. 1. representation of free air and bougueranomalies.Journal of Geophysical Research, Vol. 98, No. B2, February 10, pp. 2187-2198.BrazilGravity, Map
DS1993-1636
1993
Ussami, N.Ussami, N., Cogo de Sa, N., Cassola Molina, E.Gravity map of Brasil 2. regional and residual isostatic anomalies and their correlation with major tectonic provincesJournal of Geophysical Research, Vol. 98, No. B2, February 10, pp. 2199-2208BrazilGeophysics, Tectonics, structure
DS201012-0586
2010
Ussami, N.Pinto, L.G.R.,Banik de Padua, M., Ussami, N., Vitorello, I., Padilha, A.L., Braitenberg, C.Magnetotelluric deep soundings, gravity and geoid in the south Sao Francisco craton: geophysical indicators of cratonic lithosphere rejuvenation and underplating.Earth and Planetary Science Letters, Vol. 297, pp. 423-434.South America, BrazilCarbonatite
DS201012-0633
2010
Ussami, N.Rodrigues Pinto, L.G., Banik de Padua, M., Ussami, N., Vitorello, I., Lopes Padhilha, A., Braitenberg, C.Magnetotelluric deep soundings, gravity and geoid in the south Sao Francisco craton: geophysical indicators of cratonic lithosphere rejuvenation and crustal underplating.Earth and Planetary Science Letters, Vol. 297, 3-4, pp. 423-434.South America, BrazilGeophysics - magnetotellurics
DS201012-0634
2010
Ussami, N.Rodrigues Pinto, L.G., Banik de Padua, M., Ussami, N., Vitorello, I., Lopes Padhilha, A., Braitenberg, C.Magnetotelluric deep soundings, gravity and geoid in the south Sao Francisco craton: geophysical indicators of cratonic lithosphere rejuvenation and crustal underplating.Earth and Planetary Science Letters, Vol. 297, 3-4, pp. 423-434.South America, BrazilGeophysics - magnetotellurics
DS201612-2287
2016
Ussami, N.Chaves, C., Ussami, N., Ritsema, J.Density and P-wave velocity structure beneath the Parana magmatic province: refertilization of an ancient lithospheric mantle.Geochemistry, Geophysics, Geosystems: G3, Vol. 17, 10, 1002/ 2016GC006369.South AmericaMagmatism

Abstract: We estimate density and P-wave velocity perturbations in the mantle beneath the southeastern South America plate from geoid anomalies and P-wave traveltime residuals to constrain the structure of the lithosphere underneath the Paraná Magmatic Province (PMP) and conterminous geological provinces. Our analysis shows a consistent correlation between density and velocity anomalies. The P-wave speed and density are 1% and 15 kg/m3 lower, respectively, in the upper mantle under the Late Cretaceous to Cenozoic alkaline provinces, except beneath the Goiás Alkaline Province (GAP), where density (+20 kg/m3) and velocity (+0.5%) are relatively high. Underneath the PMP, the density is higher by about 50 kg/m3 in the north and 25 kg/m3 in the south, to a depth of 250?-?300 km. These values correlate with high-velocity perturbations of +0.5% and +0.3%, respectively. Profiles of density perturbation versus depth in the upper mantle are different for the PMP and the adjacent Archean São Francisco (SFC) and Amazonian (AC) cratons. The Paleoproterozoic PMP basement has a high-density root. The density is relatively low in the SFC and AC lithospheres. A reduction of density is a typical characteristic of chemically depleted Archean cratons. A more fertile Proterozoic and Phanerozoic subcontinental lithospheric mantle has a higher density, as deduced from density estimates of mantle xenoliths of different ages and composition. In conjunction with Re-Os isotopic studies of the PMP basalts, chemical and isotopic analyses of peridodite xenoliths from the GAP in the northern PMP, and electromagnetic induction experiments of the PMP lithosphere, our density and P-wave speed models suggest that the densification of the PMP lithosphere and flood basalt generation are related to mantle refertilization. Metasomatic refertilization resulted from the introduction of asthenospheric components from the mantle wedge above Proterozoic subduction zones, which surrounded the Paraná lithosphere. The high-density PMP lithosphere is presently gravitationally unstable and prone to delamination.
DS201903-0499
2019
Ussami, N.Bologna, M.S., Dragone, G.N., Muzio, R., Peel, E., Nunez, Demarco, P., Ussami, N.Electrical structure of the lithosphere from Rio de la Plata craton to Parana Basin: amalgamation of cratonic and refertilized lithospheres in SW Gondwanaland.Tectonics, Vol. 38, 1, pp. 77-94.South America, Brazilcraton

Abstract: We conducted a magnetotelluric (MT) study from Paleoproterozoic Rio de la Plata Craton, in Uruguay, toward Paleozoic-Mesozoic Paraná Basin, in Brazil. The 850-km-long MT transect comprises 35 evenly spaced broadband electromagnetic soundings sites. In the Paraná Basin, 11 additional long-period measurements were acquired to extend the maximum depth of investigation. All data were inverted using two- and three-dimensional approaches obtaining the electrical resistivity structure from the surface down to 200 km. The Rio de la Plata Craton is >200-km thick and resistive (~2,000 Om). Its northern limit is electrically defined by a lithosphere scale lateral transition and lower crust conductive anomalies (1-10 Om) interpreted as a Paleoproterozoic suture at the southern edge of Rivera-Taquarembó Block. The latter is characterized by an approximately 100-km thick and moderate resistive (>500 Om) upper mantle. The Ibaré shear zone is another suture where an ocean-ocean subduction generated the 120-km thick and resistive (>1,000 Om) São Gabriel juvenile arc. Proceeding northward, a 70- to 80-km thick, 150-km wide, and inclined resistive zone is imaged. This zone could be remnant of an oceanic lithosphere or island arcs accreted at the southern border of Paraná Basin. The MT transect terminates within the southern Paraná Basin where a 150- to 200-km-thick less resistive lithosphere (<1,000 Om) may indicate refertilization processes during plate subduction and ocean closure in Neoproterozoic-Cambrian time. Our MT data support a tectonic model of NNE-SSW convergence for this segment of SW Gondwanaland.
DS202108-1279
2021
Ussami, N.Dragone, G.N., Bologna, M.S., Ussami, N., Gimenez, M.E., Alvarez, O., Klinger, F.G.L., Correa-Otto, S.Lithosphere of South American intracratonic basins: electromagnetic and potential field data reveal cratons, terranes, and sutures.Tectonophysics, Vol. 811, 13p. PdfSouth America, Argentinacratons

Abstract: A magnetotelluric survey comprising 18 broadband stations disposed along a 450 km-long profile was carried out at the transition between the Chaco-Paraná (CPB) and the Paraná (PB) intracratonic basins in northeastern Argentina. Three-dimensional inversions of the responses show that the CPB and southern PB lithospheres are resistive (~103 O m) down to 120 km, but with distinct crustal and upper mantle electrical properties. Also, Bouguer gravity and density anomalies are positive at CPB, whereas they are negative at PB. We associate the CPB lithosphere with the Paleoproterozoic Rio Tebicuary craton and the southern PB lithosphere with an ancient and buried piece of craton, the Southern Paraná craton. Geochemical data of mantle xenoliths from the Cenozoic alkaline/carbonatitic province within the Rio Tebicuary craton suggest a subcontinental lithospheric mantle affected by metasomatic processes, which explains its lower resistivity (reaching values as low as 300 O m) and higher density (#Mg = 0.87). In contrast, the Southern Paraná craton is more resistive (>103 O m) and less dense, suggesting a de-hydrated, depleted, and thicker craton. These cratons are separated by a crustal conductor (15 to 20 km depth; 1-10 O m) that we interpret as a southward continuation of a linear anomaly (Paraná Axial Anomaly) defined in former induction studies within the PB in Brazil. Hence, we redefined the trace of this conductive lineament: instead of bending towards the Torres Syncline, it continues inside the CPB. We propose the lineament to be an Early Neoproterozoic suture zone that controlled the location of maximum subsidence in the intracratonic basins during the Paleozoic. In the Early Cretaceous, the Paraná Axial Anomaly was the site of maximum extrusion and deposition of Serra Geral basalts. This anomaly separates compositionally distinct cratonic lithospheres along its path. Melting of this heterogeneous and enriched mantle created the Paraná igneous province.
DS200412-1438
2004
Ussoltsev, II.Nitsenko, P., Ussoltsev, II.The Kumdy Kol diamond deposit North Kazakhstan: the geology and the origin of metamorphic diamond.Earth Science Frontiers, Vol. 11, 2, pp. 333-338.Russia, KazakhstanMetamorphic
DS200512-1111
2005
Ustinov, V.Ustinov, V.Diamond exploration of Alrosa in European Russia.PDAC 2005, Abstract 1p.Russia, Karelian-Kola, Volga-Ural, Voronezh-UkraineBrief overview abstract
DS200912-0432
2009
Ustinov, V.Lehtonen, M., O'Brien, H., Peltonen, P., Kukkonen, I., Ustinov, V., Verzhak, V.Mantle xenocrysts from the Arkangelskaya kimberlite (Lomonosov); constraints on the composition and thermal state of the Diamondiferous lithospheric mantle.Lithos, in press availableRussia, Kola Peninsula, ArchangelDeposit - Lomonosov
DS201312-0930
2013
Ustinov, V.Ustinov, V., Serv, V., Mituykhin, S.Diamond exploration of Alrosa in Russia: present and future.PDAC 2013, March 4, 1/2p. AbstractRussiaOverview - Alrosa
DS201702-0246
2017
Ustinov, V.Ustinov, V.Diamond potential of Angola: results of co-operation of Alrosa and Endiama.PDAC 2017, March 6, 1p. AbstractAfrica, AngolaExploration review
DS201708-1782
2017
Ustinov, V.Ustinov, V.Kimberlite field of Angola: structural control and diamond presence.11th. International Kimberlite Conference, PosterAfrica, Angoladeposit - Angola
DS201708-1783
2017
Ustinov, V.Ustinov, V.Models of reflection of kimberlite pipes of north east of Botswana in eolian haloes of dispersion.11th. International Kimberlite Conference, PosterAfrica, Botswanageochemistry
DS1981-0416
1981
Ustinov, V.I.Ustinov, V.I.Oxygen Isotope Compositions of Mantle Xenoliths from the Obnazhennaya Kimberlite Pipe in North Yakutia.Geochemistry International, Vol. 18, No. 3, PP. 170-174.Russia, YakutiaGeochronology
DS1987-0756
1987
Ustinov, V.I.UKhanov, A.V., Ustinov, V.I., Devirts, A.L., Grinenko, V.A.Low serpentinization temperatures of Yakutian kimberlites, as estimated from dat a on oxygen isotopesDoklady Academy of Science USSR, Earth Science Section, Vol. 288, No. 1-6, pp. 163-166YakutiaBlank
DS1987-0757
1987
Ustinov, V.I.UKhanov, A.V., Vlasova, E.V., Devirts, A.L., Ustinov, V.I.IR spectra and isotope composition of hydrogen and oxygen in micas From kimberlites of Yakutia.(Russian)Zap. Vses. Mineral. O. Va, (Russian), Vol. 116, No. 3, pp. 334-341MantleGeochronology, Isotope
DS1987-0759
1987
Ustinov, V.I.Ustinov, V.I., Ukhanov, A.V., Grinenko, V.A., Gavrilov, E.Y.Isotopic composition of oxygen of eclogites from kimberlite pipes Udachnaya and Obnazhennaya. (Technical note). (in Russian)Geochemistry International (Geokhimiya), (Russian), No. 11, November pp. 1637-1641RussiaBlank
DS1989-1533
1989
Ustinov, V.I.Ustinov, V.I., Ukhanov, A.V., Grinenko, V.A.Delta 18O in an olivine-chrome spinelid assemblageGeochemistry International, Vol. 26, No. 9, pp. 128-132RussiaHypabasites, Kimberlite magma
DS1994-0956
1994
Ustinov, V.I.Krylov, D.P., Ustinov, V.I.Condition of the formation of the Archean charnockites and Aker Peaks(Napier Complex) East Antarctica).Geochemistry International, Vol. 31, No. 8, pp. 13-23.AntarcticaGeochronology, Napier Complex
DS1994-1672
1994
Ustinov, V.I.Spetsius, Z.V., Ustinov, V.I., Grinenko, V.A.Variation of oxygen isotope composition during alteration of eclogite To the amorphous state.Doklady Academy of Sciences Acad. Science USSR, Vol. 323, No. 2, June pp. 151-155.RussiaEclogite, Geochronology
DS1994-1818
1994
Ustinov, V.I.Ustinov, V.I., Ukhanov, A.V., Gavrilov, E.V.On the oxygen isotopic composition of mineral assemblages at different stages of kimberlite formation. (Russian)Geochemistry International (Geokhimiya), (Russian), No. 1, pp. 144-148.RussiaGeochronology, Kimberlite mineralogy
DS1994-1819
1994
Ustinov, V.I.Ustinov, V.I., Ukhanov, A.V., Gavrilov, Ye. Ya.Oxygen isotope composition of the mineral assemblages in the stages of emplacement of kimberlites.Geochemistry International, Vol. 31, No. 8, pp. 152-156.RussiaGeochronology, mineralogy, Kimberlites
DS2001-1172
2001
Ustinov, V.I.Ulyanov, A.A., Ustinov, V.I., Turchkova, A.G., Pekov, I.V.Oxygen isotope composition of minerals from highly alkalic rocks of the Khibiny Massif ( Kola Peninsula).Moscow University Bulletin, Vol.56,4,pp.56-63.Russia, Kola PeninsulaAlkaline rocks - not specific to diamonds
DS200512-0961
2005
Ustinov, V.I.Serov, V.P., Kharkiv, A.D., Ustinov, V.I., Ukhanov, A.V.The Sobolev kimberlite pipe: structure and composition. YakutiaRussian Geology and Geophysics, Vol. 46, 2, pp. 188-198.Russia, YakutiaMineralogy - Sobolev
DS1986-0824
1986
Ustinov, V.I. eta l.UKanov, A.V., Ustinov, V.I. eta l.Low temperature of Yakutian kimberlite serpentinization from isotope oxygen data.(Russian)Doklady Academy of Sciences Akademy Nauk SSSR, (Russian), Vol. 288, No. 2, pp. 466-469YakutiaGeochronology
DS200812-1196
2008
Ustinov, V.N.Ushkov, V.V., Ustinov, V.N., Smith, C.B., Bulanova, G.P., Lukyanova, L.I., Wiggers de Vries, D., PearsonKimozero, Karelia: a Diamondiferous paleoproterozoic metamorphosed volcaniclastic kimberlite.9IKC.com, 3p. extended abstractRussia, KareliaDeposit - Kimozero
DS200912-0781
2009
Ustinov, V.N.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
DS201412-0714
2014
Ustinov, V.N.Priyatkina, N., Khudoley, A.K., Ustinov, V.N., Kullerud, K.1.92 Ga kimberlitic rocks from Kimozero, NW Russia: their geochemistry tectonic setting and unusual field occurrence.Precambrian Research, Vol. 249, pp. 162-179.RussiaDeposit - Kimozero
DS201603-0427
2016
Ustinov, V.N.Ustinov, V.N.Terrigenous diamond-bearing rocks of the Siberian, East-European and African platforms.Alrosa publication, 532p. Title, abstract, table of contents in english ( courtesy of Ustinov)Russia, Europe, AfricaDiamondiferous strata - structure, morphology, zones, exploration technology
DS201704-0649
2017
Ustinov, V.N.Ustinov, V.N.Terriginous diamond-bearing rocks of the Siberian, East-European and African platforms. IN RUS***Nauka ***in RUS, 531p. Index of chapters available in english 3p. PdfRussiaBook - 9 chapters * titles descriptions in english
DS201802-0272
2017
Ustinov, V.N.Ustinov, V.N.Conditions of formation of Mesozoic and Cenozoic diamond bearing rocks of north eastern Angola. ***IN RUSOtechestvennaya Geologiya ***IN RUS, No. 6, pp. 40-51. pdfAfrica, Angolakimberlite - pipes, placers, alluvials
DS201802-0273
2017
Ustinov, V.N.Ustinov, V.N.Lithological stratigraphic dissection and mineral composition of Mesozoic and Cenozoic diamond bearing rocks of the north eastern Angola. ***IN RUSOres and Metals ***IN RUS, no. 4, pp. 76-84. pdfAfrica, Angolakimberlite - stratigraphy
DS201802-0274
2017
Ustinov, V.N.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
Ustinov, V.N.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
DS201802-0276
2017
Ustinov, V.N.Ustinov, V.N., Lobkova, L.P., Kukuy, I.M., Antashchuk, G., Nikolaeva, E.V.The Karelian Kola megacraton zoning on types of diamond primary sources. IN RUSGeology and Mineral Resources of Siberia *** IN RUS, No. 7, pp. 51-61.Russia, Kola Peninsulakimberlite - indicator minerals
DS201802-0283
2017
Ustinov, V.N.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
Ustinov, V.N.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
DS201809-2106
2018
Ustinov, V.N.Ustinov, V.N., Mosigi, B., Kukui, I.M., Nikolaeva, E., Campbell, J.A.H., Stegnitskiy, Y.B., Antashchuk, M.G.Eolian indicator mineral dispersion haloes from the Orapa kimberlite cluster, Botswana.Mineralogy and Petrology, doi.org/10.1007/s00710-018-0627-2 9p.Africa, Botswanadeposit - Orapa

Abstract: This paper presents the results of an investigation into the structure of eolian kimberlite indicator minerals (KIMs) haloes present within Quaternary Kalahari Group sediments (up to 20 m thick) overlying the Late Cretaceous kimberlites in the Orapa field in North-East Botswana. A database of more than 8000 samples shows that kimberlites create a general mineralogical blanket of KIMs of various distances of transportation from primary sources in the Orapa area. Models of the reflection and dispersion patterns of KIMs derived from kimberlite pipes including AK10/ AK22/AK23 have been revealed based on 200 selected heavy mineral samples collected during diamond prospecting activities in Botswana from 2014 to 2017. Short distance eolian haloes situated close to kimberlite bodies cover gentle slopes within plains up to 500 × 1000 m in size. They have regularly have oval or conical shapes and are characterized by the presence mainly of unabraded or only slightly abraded KIMs. A sharp reduction of their concentration from hundreds and thousands of grains / 20 l immediately above kimberlites toto 10 grains/20 l at a distance of only 100-200 m from the pipes is a standard feature of these haloes. The variation of concentration, morphology and abrasion of specific KIMs with increasing distance from the primary sources has been investigated and presented herein. Sample volumes recommended for pipes present within a similar setting as those studied, with different depth of sedimentary cover are as follows: up to 10-20 m cover at 20-50 l, 20-30 m cover at 50-100 l and 30-80 m cover at 250 l. It is important to appreciate that the discovery of even single grains of unabraded or slightly abraded KIMs in eolian haloes are of high prospecting significance in this area. The results of the research can be applied to in diamond prospecting programs in various regions with similar environments.
DS201810-2386
2018
Ustinov, V.N.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.
DS201112-1065
2011
Ustinova, G.Ustinova, G.Production of anomalous Xe in nanodiamond in chondrites during the last supernova explosion predating the origin of the Solar System.Geochemistry International, Vol. 49, 6, pp. 555-567.TechnologyNanodiamonds

Abstract: Anomalous Xe enriched in both heavy and light isotopes (Xe-HL) was identified in the high-temperature Xe fraction in relict nanodiamond grains from chondrites, whereas the low-temperature Xe fraction (Xe-P3) typically has the normal isotopic composition. The paper presents a concise review of current models put forth to account for the genesis of nanodiamond with anomalous noble gas components and specifies a real process and major regularities during the generation of the isotopic relations of the anomalous Xe-HL component in relict nanodiamond grains. This component is demonstrated to be formed and captured simultaneously with the synthesis of nanodiamond, when shock waves induced by supernova explosions propagated. It is important that diamond synthesis during the passage of shock waves and the enrichment of this diamond in Xe-HL are also possible in the wave forefront region under extremal P-T conditions, in the pressure drop region behind the wave front (by means of nucleation), and by means of irradiation of carbonic grains with high-energy particles. The isotopic composition of Xe-HL results from an increase in the hardness of the spectrum of nuclear-active particles and its enrichment in heavy ions at acceleration in shock waves. Arguments are presented in support of the hypothesis that the nanodiamond population found in chondrites was produced during the latest supernova explosion before the development of the Solar System, with the supernova likely being a SnIa carbon detonation supernova. This furnishes evidence in support of recently advanced hypotheses that the nanodiamond population of chondrites is not presolar.
DS1990-0296
1990
USTLCentre Geologique et Geophysique, USTLOrogenic lherzolites and mantle processes #1Workshop 90, Centre Geologique et Geophysique/USTL Place Eugene, Sept. 12-15GlobalLherzolites, Mantle heterogeneities
DS2003-1401
2003
Usui, T.Usui, T., Nakamura, E., Kobayashi, K., Maruyama, S., Helmstaedt, H.Fate of the subducted Farallon plate inferred from eclogite xenoliths in the ColoradoGeology, Vol. 31, 7, July, pp. 589-592.Colorado Plateau, New Mexico, WyomingSubduction
DS200412-2028
2003
Usui, T.Usui, T., Nakamura, E., Kobayashi, K., Maruyama, S., Helmstaedt, H.Fate of the subducted Farallon plate inferred from eclogite xenoliths in the Colorado Plateau.Geology, Vol. 31, 7, July, pp. 589-592.United States, ColoradoSubduction
DS200612-1455
2006
Usui, T.Usui, T., Kobayashi, K., Nakamura, E., Helmstaedt, H.Trace element fractionation in deep subduction zones inferred from a lawsonite eclogite xenolith from the Colorado Plateau.Chemical Geology, in press available,United States, Colorado PlateauEclogite, subduction, Farallon plate, coesite
DS200612-1456
2006
Usui, T.Usui, T., Nakamura, E., Helmstaedt, H.Petrology and geochemistry of eclogite xenoliths from the Colorado Plateau: implications for the evolution of subducted oceanic crust.Journal of Petrology, Vol. 47, 5, pp. 929-964.United States, Colorado PlateauSubduction
DS200712-1103
2007
Usui, T.Usui, T., Kobayahsi, K., Nakamura, E., Helmstaedt, H.Trace element fractionation in deep subduction zones inferred from a lawsonite eclogite xenolith from the Colorado Plateau.Chemical Geology, Vol. 239, 3-4, April 30, pp. 336-351.United States, Colorado PlateauSubduction
DS200612-0761
2006
Usuki, T.Lan, C.Y., Izuka,T., Usuki, T., Wang, K.L., Anh, T.T., Van lOng ,T., O'Reilly, S.Y.Petrology and geochemistry of peridotite xenoliths from Vietnam Indochin a block.Geochimica et Cosmochimica Acta, Vol. 70, 18, p. 2. abstract only.ChinaXenolith - geochemistry
DS2001-0499
2001
UtadaIchiki, M., Uyeshima, M., Utada, Guoze, Zi, MingzhiUpper mantle conductivity structure of the back arc region beneath northeastern ChinaGeophysical Research Letters, Vol. 28, No. 19, Oct. 1, pp. 3773-76.China, northeastTectonics
DS2003-1402
2003
Utada, H.Utada, H., Koyama, T., Shimizu, H., Chave, A.A semi global reference model for electrical conductivity in the mid mantle beneath theGeophysical Research Letters, Vol. 30, 4, Feb. 15, DOI 10.1029/2002GLO16092.OceanBlank
DS200412-0591
2004
Utada, H.Fukao, Y., Koyama, T., Obayashi, M., Utada, H.Trans Pacific temperature field in the mantle transition region derived from seismic and electromagnetic tomography.Earth and Planetary Science Letters, Vol. 217, 3-4, Jan. 15, pp.425-434.MantleGeophysics - seismics
DS200412-2029
2003
Utada, H.Utada, H., Koyama, T., Shimizu, H., Chave, A.A semi global reference model for electrical conductivity in the mid mantle beneath the north Pacific region.Geophysical Research Letters, Vol. 30, 4, Feb. 15, DOI 10.1029/2002 GLO16092.OceanGeophysics - seismics
DS200612-0043
2006
Utada, H.Asari, S., Shimizu, H., Utada, H.Variability of the topographic core-mantle torque calculated from core surface flow models.Physics of the Earth and Planetary Interiors, Vol. 154, 1, pp. 85-111.MantleTomography
DS200612-0519
2006
Utada, H.Hae, R., Ohtani, E., Kubo, T., Koyama, T., Utada, H.Hydrogen diffusivity in wadsleyite and water distribution in the mantle transition zone.Earth and Planetary Science Letters, Vol. 243,1-2, Mar. 15, pp. 141-148.MantleIR spectroscopy
DS200612-0617
2006
Utada, H.Ichiki, M., Baba, K., Obayashi, M., Utada, H.Water content and geotherm in the upper mantle above the stagnant slab: interpreation of electrical conductivity and seismic P wave velocity models.Physics of the Earth and Planetary Interiors, Vol. 155, 1-2, April 14, pp. 1-15.MantleGeothermometry, harzburgite, back arc volcanism
DS200912-0782
2009
Utada, H.Utada, H., Koyama, T., Obayashi, M., Fukao, Y.A joint interpretation of electromagnetic and seismic tomography models suggest the mantle transition zone below Europe is dry.Earth and Planetary Science Letters, Vol. 281, 3-4, May 15, pp. 249-257.EuropeGeophysics - seismics
DS200612-1129
2006
Utenkov, V.A.Rass, I.T., Abramov, S.S., Utenkov, V.A., Kozlovskii, V.M., Korpechkov, D.I.Role of fluid in the genesis of carbonatites and alkaline rocks: geochemical evidence.Geochemistry International, Vol. 44, 7. pp. 656-664.RussiaCarbonatite
DS201911-2564
2019
Uthup, S.Snatish, M., Tsunogae, T., Yang, C-X., Han, Y-S., Hari, K.R., Prasanth, M., Uthup, S.The Bastar craton, central India: a window to Archean-paleoproterozoic crustal evolution.Gondwana Research, in press available 69p. PdfIndiacraton

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

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

Abstract: The Bastar craton in central India, surrounded by cratonic blocks and Paleoproterozoic to Neoproterozoic orogenic belts, is a window to investigate the Archean-Paleoproterozoic crustal evolution and tectonic processes. Here we propose a new tectonic classification of the craton into the Western Bastar Craton (WBC), Eastern Bastar Craton (EBC), and the intervening Central Bastar Orogen (CBO). We present petrologic, geochemical and zircon U-Pb, REE and Lu-Hf data from a suite of rocks from the CBO and along the eastern margin of the WBC Including: (1) volcanic successions comprising meta-andesite and fine-grained amphibolite, representing arc-related volcanics along a convergent margin; (2) ferruginous sandstone, in association with rhyolite, representing a volcano-sedimentary succession, deposited in an active trench; and (3) metamorphosed mafic-ultramafic suite including gabbro, pyroxenite and dunite invaded by trondhjemite representing the section of sub-arc mantle and arc root adjacent to a long-lasting subduction system. Petrologic studies indicate that the mafic-ultramafic suite crystallized from an island arc tholeiitic parental magma in a suprasubduction zone environment. The chondrite-normalized and primitive mantle normalized diagrams of the mafic and ultramafic rocks suggest derivation from MORB magma. The mixed characters from N-MORB to E-MORB of the studied samples are consistent with subduction modification of a MORB related magma, involving partial melting of the metasomatized mantle wedge. Our zircon U-Pb age data suggest that the cratonic nuclei was constructed as early as Paleoarchean. We present evidence for active subduction and arc magmatism through Mesoarchean to Neoarchean and early Paleoproterozoic, with the trench remaining open until at least 2.3?Ga. Two major crust building events are recognized in the Bastar craton: during Mesoarchean (recycled Paleoarchean subduction-related as well as juvenile/depleted mantle components) and Neoarchean (accretion of juvenile oceanic crust, arc magmatism including granite batholiths and related porphyry mineralization). The final cratonization occurred during latest Paleoproterozoic, followed by collisional assembly of the craton and its incorporation within the Peninsular Indian mosaic during Mesoproterozoic. In the global supercontinent context, the craton preserves the history of Ur, the earliest supercontinent, followed by the Paleo-Mesoproterozoic Columbia, as well as minor thermal imprints of the Neoproterozoic Rodinia and associated Grenvillian orogeny.
DS1988-0721
1988
Uto, K.Uto, K., Hirai, H., Goto, K., Arai, S.K-Ar ages of carbonate and mantle nodule bearing lamprophyre dikes fromShingu, central Shikoku, southwest JapanGeochemical JOurnal, Vol. 21, No. 6, pp. 283-290JapanBlank
DS2000-0433
2000
Utsumi, W.Irifune, T., Miyashita, M., Utsumi, W.high pressure phase transformation in Ca MgSi2O6 and implications for origin of ultra deep diamond inclusionGeophysical Research Letters, Vol. 27, No. 21, Nov. 1, pp. 3541-44.MantleDiamond inclusions, ultra high pressure (UHP)
DS2002-1179
2002
Utsumi, W.Okada, T., Utsumi, W., Kaneko, H., Yamakata, M., Shimomura, O.In situ observations of the decomposition of brucite diamond conversion in aqueous fluid at high pressure and temperature.Physics and Chemistry of Minerals, Vol. 29, 7, pp. 439-45.GlobalDiamond - UHP, Mineral exploration potential
DS200412-1462
2004
Utsumi, W.Okada, T., Utsumi, W., Kaneko, H., Turkevich, V., Hamaya, N., Shimomura, O.Kinetics of the graphite diamond transformation in aqueous fluid determined by in situ X ray diffractions at high pressures andPhysics and Chemistry of Minerals, Vol. 31, 4, pp. 261-268.TechnologyUHP
DS200512-1112
2005
Utting, D.Utting, D., Little, E., Brown, O., Young, M., Taylor, J.Glacial geology, drift bedrock prospecting and related remote sensing application on northern Baffin Island, Nunavut.Geological Survey of Canada Open File, OF 4736 $ 15.00 1 colour posterCanada, NunavutRemote sensing
DS2002-0952
2002
Utting, D.J.Little, E.C., Ferbey, T., McMartin, I., Ozyer, C.A., Utting, D.J.Overview of Quaternary research for the Committee Bay project, central NunavutGeological Survey of Canada Current Research, 12p.NunavutGeomorphology
DS2003-0919
2003
Utting, D.J.McMartin, I., Utting, D.J., Little, E.C., Ozyer, C.A., Ferbey, T.Complete results from Committee Bay central NunavutGeological Survey of Canada Open File, No. 4493, 1 CD $ 26.00NunavutGeomorphology, geochemistry - not specific to diamonds
DS200412-1149
2002
Utting, D.J.Little, E.C., Ferbey, T., McMartin, I., Ozyer, C.A., Utting, D.J.Overview of Quaternary research for the Committee Bay project, central Nunavut.Geological Survey of Canada Current Research, 12p.Canada, NunavutGeomorphology
DS200412-1278
2003
Utting, D.J.McMartin, I., Utting, D.J., Little, E.C., Ozyer, C.A., Ferbey, T.Complete results from Committee Bay central Nunavut.Geological Survey of Canada Open File, No. 4493, 1 CD $ 26.00Canada, NunavutGeomorphology, geochemistry - not specific to diamonds
DS200512-0117
2005
Utting, D.J.Brown, O.H., Utting, D.J., Little, E.C., Grunsky, E.C., Harris, J., Peter, P.Remote predictive mapping of surficial geology in Nunavut using supervised classification techniques of Land sat and RADARSAT I data.GAC Annual Meeting Halifax May 15-19, Abstract 1p.Canada, NunavutRemote sensing
DS200812-0973
2007
Utting, D.J.Ross, M., Utting, D.J., Hodgson, D.A., James, D.T.Ice flow and dispersal patterns on Southampton Island Nunavut: a preliminary Assessment. ( KIMs)35th. Yellowknife Geoscience Forum, Abstracts only p. 52.Canada, NunavutGeochemistry - samples
DS1992-1237
1992
Uvadyev, L.I.Proskuryakov, V.V., Uvadyev, L.I.Lamproites of the eastern part of the Baltic shield.(Russian)Izvest. Akad. Nauk (Russian), No. 8, August pp. 65-75.Russia, Baltic shieldLamproite, Geochemistry
DS1992-1238
1992
Uvad'yev, L.I.Proskuryakov, V.V., Uvad'yev, L.I., Voinova, O.A.Lamproites of the Karelia-Kola regionDoklady Academy of Sciences USSR, Earth Science Section, Vol. 314, No. 1-6, July 1992, pp. 152-156.Russia, Karelia, KolaLamproites, Petrology
DS1970-0505
1972
Uvarov, V.A.Donova, K.V., Uvarov, V.A., et al.Sokrovishcha Almaznogo Fonda SssrMoscova: Izdatelstvo Izobrazitelnoe Iskusstvo, 136P.RussiaKimberlite, Kimberley, Catalogue, Diamond
DS2002-1627
2002
Uyeda, S.Uyeda, S.Continental drift, sea floor spreading and plate/plume tectonicsInternational Geophysics Series, Vol. 81, A, pp. 51-68.MantleTectonics
DS1999-0104
1999
UyenoCadman, A.C., Noble, J., Turner, Uyeno, Thorsteinssonuranium-lead (U-Pb) ages of syndeformational dikes associated with the Mesoproterozoic Nain plutonic suite, Labrador.Canadian Journal of Earth Sciences, Vol. 36, No. 3, Mar. pp. 339-348.Quebec, Labrador, UngavaGeochronology, Nain Plutonic Suite
DS2001-0499
2001
Uyeshima, M.Ichiki, M., Uyeshima, M., Utada, Guoze, Zi, MingzhiUpper mantle conductivity structure of the back arc region beneath northeastern ChinaGeophysical Research Letters, Vol. 28, No. 19, Oct. 1, pp. 3773-76.China, northeastTectonics
DS201412-0223
2014
Uysal, I.Ersoy, Y.E., Palmer, M.R., Uysal, I., Gundogan, I.Geochemistry and petrology of the Early Miocene lamproites and related volcanic rocks in the Thrace basin, NW Anatolia.Journal of Volcanology and Geothermal Research, Vol. 283, pp. 143-158.Europe, TurkeyLamproite
DS201907-1553
2019
Uysal, I.Jing, J-J., Su, B-X., Xiao, Y., Zhang, H-F., Uysal, I., Chen, C., Lin, W., Chu, Y., Saka, S.Reactive origin of mantle harzburgite: evidence from orthopyroxene-spinel association.Lithos, Vol. 342-343, pp. 175-186.Europe, Turkeymelting

Abstract: Harzburgites with high modal orthopyroxene (generally >23?vol%) in Archean craton, mantle wedge and oceanic lithospheric mantle are considered to be produced by the interaction between Si-rich liquids and rocks. However, the absence of samples from continental margin hinders the recognition whether this process is prevalent. Mantle xenoliths entrained in Miocene basalts from the Thrace Basin, the margin of Eurasian continent, are dominated by harzburgites with anomalously high orthopyroxene modes. These orthopyroxene grains closely associate with spinel and occasionally with clinopyroxene. In these orthopyroxene-spinel associations, orthopyroxene grains can be up to 1?cm in diameter and display high Al2O3 contents (1.41-4.61?wt%) and Mg# values (89.6-92.4), while spinel crystals are anhedral and bud-shaped and are commonly foliated, with a wide variation in Cr# values ranging from 7.8 to 52.7. The Fe2+/Fe3+ vs. TiO2 diagram shows lots of these spinels are “magmatic” (i.e. spinel crystallized from melts). The orthopyroxene grains have LREE diverging from the modelled melting trends, indicating possible metasomatism following partial melting. They are present in elongated shape, cutting across olivine grains and also replacing olivine as surrounding rims. Fine-grained olivine is occasionally enclosed in the orthopyroxene-spinel association. We, therefore, propose that the association of orthopyroxene and spinel developed from the melt/fluid-rock interaction. These features indicate mineral phase transformation from olivine to orthopyroxene, which can be expressed by the equation: ‘Mg2SiO4 (Ol)?+?SiO2?=?Mg2Si2O6 (Opx)’. The observed Al-rich rim of spinel and bud-shaped Al-spinel, suggest sufficient amount of Al in the Si-rich liquids. The mechanism involved here is the consumption of olivine to produce orthopyroxene and spinel as in the equation: ‘Mg2SiO4 (Ol)?+?Al2O3?=?MgSiO3 (Opx)?+?MgAl2O4 (Sp)’. The Si and Al were enriched in the percolating liquids. Both the high-Cr# and low-Cr# spinels with ‘magmatic’ features imply the percolating liquids were multi-staged or inhomogeneous Cr contents in the liquids. This melt/fluid-rock interaction may account for the formation of abundant harzburgites with high orthopyroxene modes in the Eurasian continental margin. Thus, it indicates the reacting harzburgites are prevalent in the lithospheric mantle beneath oceanic crust, Archean craton and mantle wedge, as well as in the continental margin.
DS201909-2051
2019
Uysal, I.Jing, J-J., Su, B-X., Xiao, Y., Zhang, H-F., Uysal, I., Chen, C., Lin, W., Chu, Y., Saka, S.Reactive origin of mantle harzburgite: evidence from orthopyroxene-spinel association.Lithos, Vol. 342-343, pp. 175-186.Mantleharzburgite

Abstract: Harzburgites with high modal orthopyroxene (generally >23?vol%) in Archean craton, mantle wedge and oceanic lithospheric mantle are considered to be produced by the interaction between Si-rich liquids and rocks. However, the absence of samples from continental margin hinders the recognition whether this process is prevalent. Mantle xenoliths entrained in Miocene basalts from the Thrace Basin, the margin of Eurasian continent, are dominated by harzburgites with anomalously high orthopyroxene modes. These orthopyroxene grains closely associate with spinel and occasionally with clinopyroxene. In these orthopyroxene-spinel associations, orthopyroxene grains can be up to 1?cm in diameter and display high Al2O3 contents (1.41-4.61?wt%) and Mg# values (89.6-92.4), while spinel crystals are anhedral and bud-shaped and are commonly foliated, with a wide variation in Cr# values ranging from 7.8 to 52.7. The Fe2+/Fe3+ vs. TiO2 diagram shows lots of these spinels are “magmatic” (i.e. spinel crystallized from melts). The orthopyroxene grains have LREE diverging from the modelled melting trends, indicating possible metasomatism following partial melting. They are present in elongated shape, cutting across olivine grains and also replacing olivine as surrounding rims. Fine-grained olivine is occasionally enclosed in the orthopyroxene-spinel association. We, therefore, propose that the association of orthopyroxene and spinel developed from the melt/fluid-rock interaction. These features indicate mineral phase transformation from olivine to orthopyroxene, which can be expressed by the equation: ‘Mg2SiO4 (Ol)?+?SiO2?=?Mg2Si2O6 (Opx)’. The observed Al-rich rim of spinel and bud-shaped Al-spinel, suggest sufficient amount of Al in the Si-rich liquids. The mechanism involved here is the consumption of olivine to produce orthopyroxene and spinel as in the equation: ‘Mg2SiO4 (Ol)?+?Al2O3?=?MgSiO3 (Opx)?+?MgAl2O4 (Sp)’. The Si and Al were enriched in the percolating liquids. Both the high-Cr# and low-Cr# spinels with ‘magmatic’ features imply the percolating liquids were multi-staged or inhomogeneous Cr contents in the liquids. This melt/fluid-rock interaction may account for the formation of abundant harzburgites with high orthopyroxene modes in the Eurasian continental margin. Thus, it indicates the reacting harzburgites are prevalent in the lithospheric mantle beneath oceanic crust, Archean craton and mantle wedge, as well as in the continental margin.
DS201312-0317
2013
Uysal, I.T.Glikson, A., Uysal, I.T.Geophysical and structural criteria for the identification of buried impact structures, with reference to Australia.Earth Science Reviews, Vol. 125, pp. 114-122.AustraliaTomography
DS1991-0445
1991
Uyutov, V.I.Entin, A.R., Kim, A.AQ., Maksimov, Ye.P., Uyutov, V.I., Tyan, O.A.Apatites from plutonic igneous rocks of the Aldan shieldDoklady Academy of Sciences USSR Earth Sci. Section, Vol. 313, No. 1, pp. 276-279Russia, Aldan shieldCarbonatite
DS200812-1197
2007
Uzunoglu, S.Uzunoglu, S., Aytac, A., Atakisi, A.The future of raw material prices and the world economy.Minerals & Energy - Raw Materials Report, Vol. 22, 3-4, pp. 83-88.GlobalEconomics - general
DS201312-0931
2013
Uzzi, B.Uzzi, B., Mukherjee, S., Stringer, M., Jones, B.Atypical combinations and scientific impact .. ( creative ideas based on strong knowledge and in teamwork).Science, Vol. 342, 6157, pp. 468-472.TechnologyKnowledge base
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
 
 

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