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Now showing items 121-140 of 185
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(2003)This paper presents the results of investigations of the geochemical and isotopic compositions of komatiites from various Late Archean greenstone belts and structures of the Baltic shield. The analysis of major, trace, and ...
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(2001)The paper discusses the current ideas of regional magnetic anomaly sources and experimental evidence for the formation and behavior of various magnetic minerals within a wide range of pressure, temperature and oxygen ...
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(2000)We report precise PGE (Os, Ir, Ru, Pt, and Pd) concentrations for komatiite-basalt lava sequences of the Kostomuksha greenstone belt, and for the komatiite standards KAL-1 (Abitibi) and WITS-1 (Barberton). The flowtop ...
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(2001)Prominent maxima in black shale abundance and in black shale/total shale ratio occur at 2.0-1.7 Ga, with less prominent peaks in the Late Neoproterozoic (800-600 Ma) and in the Late Archean (2.7-2.5 Ga). Peaks in chemical ...
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(2001)P-wave velocities (VP) and S-wave velocities (VS) and their directional dependence (velocity anisotropy, shear wave splitting) were measured on eight cores samples from the Kola superdeep well and on eight samples collected ...
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(1988)In aluminous gneiss of the Loukhi formation near the top of a small hill, a bed of garnet-zoisite gneiss was detected similar to rocks earlier reported in the same upper formation by N.G. Sudovikov. This garnet-zoisite ...
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(1989)The results of our thermobarogeochemical study of rocks of the anorthosite complex discussed here allow us not only to estimate the parameters of the fluid directly in inclusions from different minerals, but also to trace ...
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(1999)We have measured the Re-Os isotopic compositions of individual syngenetic sulfide inclusions from three different growth zones within a central cross section plate cut from a single Siberian diamond. Individual sulfides ...
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(1998)A combined Re-Os, Sm-Nd, U-Pb, and stepwise Pb leaching (PbSL) isotope study of hydrothermal (Mo-W)-bearing minerals and base metal sulfides from two adjacent shear zone hosted gold deposits (RAN, Kimberley) in the ...
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(1993)The oxidation state of lithospheric upper mantle is heterogeneous on a scale of at least four log units. Oxygen fugacities ( fO2 f_{O_2 } ) relative to the FMQ buffer using the olivine-orthopyroxene-spinel equilibrium range ...
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(1995)A suite of peridotite xenoliths from kimberlites intruding the Siberian craton indicate the presence of lithospheric mantle over 150 km thick at 350 Ma. We report Sr-Nd isotope data for minerals from the peridotite xenoliths ...
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(1985)At the same Mg-number, a decrease is observed in the average content of Ni, Co, and Cr in basalts between 2.5 and 2.0 b.y. Such decreases can be accounted for by smaller degrees of melting in the mantle in response to ...
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(2003)An extension of the seawater secular-variation model that successfully predicted the observed timing of Phanerozoic MgSO4 vs. KCl marine evaporites and aragonite seas vs. calcite seas has been applied to the prediction of ...
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(2002)The sialic (volcanogenic) material of the terranes in 3the Siberian fragment of a Paleoproterozoic supercontinent separated from the mantle 3.5, 3.3, 3.0, and 2.5 billion years ago. The collision zones (sutures) between ...
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(1995)A mantle value of # 17.5 for NbTa appears well established; less well established are crustal values of # 11-12, although it appears that NbTa for crustal-derived melts is less than mantle NbTa, demonstrating fractionation ...
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(1998)Mantle peridotite xenoliths from Archean cratons generally have high molar Mg/(Mg + Fe), or Mg#. The best known suites, from the Kapvaal and Siberian cratons, have high modal orthopyroxene (Opx). These high Opx compositions ...
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(2000)Two models of silicic magma formation have been experimentally tested: (1) generation of A-type granite magma by partial melting of crustal source rocks at depths >50 km; (2) production of syenite magma by partial melting ...
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(2000)The paper presents first data on the Sm-Nd isotopic systematics of metabasites from the supracrustal Sutam granulite complex (South Aldan Shield). It is established that the formation time of protoliths of mafic and ...
Now showing items 121-140 of 185