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Now showing items 1-20 of 185
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(2001)The Re–Os data on Archean komatiites from the Kostomuksha greenstone belt in the Baltic Shield are presented. This greenstone belt has been previously interpreted to represent a former oceanic plateau formed by the emplacement ...
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(2003)Geologic samples containing highly radiogenic Os (molybdenites and low-level, highly radiogenic (LLHR) samples) have no internal means by which to correct for mass fractionation during isotopic measurement by mass spectrometry. ...
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(1988)Peridotitic komatiites of Late Archean greenstone belts of the Kursk Magnetic Anomaly, first identified by Krestin, are recognizable by their present mineral composition and petrography, as well as by relict textural and ...
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(2000)The discrepancy between the impact records on the Earth and Moon in the time period, 4.0-3.5 Ga calls for a re-evaluation of the cause and localization of the late lunar bombardment. As one possible explanation, we propose ...
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(1986)Archaean gneisses in the Vestfold Block, Antarctica are cut by abundant tholeiite and rare alkaline dykes. At least five generations of dykes have been recognized on the basis of intrusive relationships, petrography and ...
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(1999)First investigation results on Sm-Nd isotope systems in clastic metasedimentary and metavolcanic rocks from the high-grade metamorphic supracrustal complexes of central Aldan Shield are used to approximately evaluate their ...
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(1988)The southeast margin of the Baltic shield is a typical Archean granite-greenstone region and, in many respects, resembles analogous Precambrian structures in other regions. We have obtained new data on age relationships, ...
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(1995)All large continental igneous provinces and most high-temperature magmas (picrites, komatiites) are found on the margins of cratonic lithosphere. The standard plume model of flood basalt formation offers no explanation for ...
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(1988)Archean anorthositic complexes occur in essentially all Archean cratons and contain large equidimensional plagioclase crystals (up to 30 cm. diam.) with highly calcic compositions (An 80 to An 90 ) but are not readily ...
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(1989)In the Vochelamba test area (Kola Peninsula) the author has found unusual small tongue-shaped folds in Archaean leucocratic plagiogneisses. The folds were carefully removed from the rock, making it possible to examine them ...
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(1995)Precise analysis of all REE's and HFSE's in mantle-derived rocks is critical to understanding the chemical compositions of different mantle reservoirs and the development of mantle lithosphere. An isotope dilution inductively ...
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(2004)Eclogites of Archean (2720± 8 Ma) and Proterozoic (2416.1± 1.3 Ma) age were found in the Belomorian Mobile Belt of the Baltic Shield near the village of Gridino in Karelia. The unique Archean eclogites described in this ...
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(2002)Detailed geological, geochemical, and petrological data were obtained on Archean magmatic rocks sampled in the area of Lake Oster, which is the northwestern margin of the ancient Vodlozero domain with tectonically combined ...
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(2002)We used an ion microprobe (SHRIMP-RG) for U-Pb dating of individual zircons in high-grade metamorphic basements of the felsic Sredinny and mafic Ganal Massifs in Kamchatka. Thirty percent of zircons from paragneisses of ...
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(2002)Zircon megacrysts from the Mir kimberlite, Yakutia, contain inclusions of chromite, chrome diopside, magnesian olivine, Ni-rich monosulfide solid solution and phlogopite. The mineral chemistry of the inclusion suite suggests ...
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(2003)The Jormua ophiolite represents seafloor from an Early Proterozoic ocean to continent transition zone that mainly consisted of Archean subcontinental lithospheric mantle. These mantle rocks were exhumed as a result of ...
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(2001)The peneplaned Archean craton of the Fennoscandian Shield served as a platform upon which a continental margin assemblage, the Karelian Supergroup, was deposited between ~2.45 and ~1.9Ga. Major subaerial unconformities ...
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(1999)A comprehensive analysis of taxonomic composition of pre-Riphean silicified and organic-walled microfossils described in publications is performed and dynamics of stromatolite abundance during the Archean and Paleoproterozoic ...
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(2000)The composition of solid precipitated from cooling magma is calculated from chemical differentiation profiles and an incompatible element monitor of fractionation. In a period of cooling, magma evolves to a derivative ...
Now showing items 1-20 of 185