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Now showing items 81-100 of 185
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(2003)Comparison of initial Pb-isotope signatures of several early Archaean (3.65–3.82 Ga) lithologies (orthogneisses and metasediments) and minerals (feldspar and galena) documents the existence of substantial isotopic heterogeneity ...
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(1988)The authors determined the concentrations not only of iridium and palladium, but also of nickel in basalt and komatiite samples from Late Archean greenstone belts of the Baltic shield. Most information on iridium was ...
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(2003)The He isotopic composition was studied in Archean enderbites, aluminous gneisses, and alkaline granites of the Kola Peninsula. It was shown that enderbites formed after intrusive protoliths during their granalite metamorphism ...
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(2004)Geological mapping showed that the northeastern part of the Belomorian mobile belt consists of metamorphic rocks (amphibolites and schists) and plagiogneisses resting on a granite basement. The close spatial association ...
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(2004)Late Archean rocks of the North Karelian system of greenstone belts and overlying Early Proterozoic sequence of the Kukasozero structure provide insights into the entire evolution of Early Precambrian tectonogenesis and ...
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(2004)This paper presents new data on the age and composition of granitoids from the Charnokitovyǐ and Drevnestanovoy complexes of the Dambukinskiǐ block in the eastern Dzhugdzhur-Stanovoy fold belt. Based on the results of U-Pb ...
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(2004)The presented geochronologic and geochemical data provide full evidence for the following conclusions. 1) The obtained age estimate (2719±14 ma) corresponds to crystallization period for the rocks of the layered series of ...
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(1989)The idea of a concentrically zoned earth, consisting of a number of concentric shells, has long been established in science. But we are only beginning to realize that each shell constitutes a self-contained dynamic system. ...
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(2004)Based on traditional petrochemical and nontraditional mineralogical methods (accessory zircon generation analysis), specific features of the primary composition of strongly metamorphosed rocks from some Early Precambrian ...
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(2004)The southern segment of the seismic profile EUROBRIDGE—EUROBRIDGE-97 (EB'97)—located in Belarus and Ukraine, crosses the suture zone between two main segments of the East European Craton—Fennoscandia and Sarmatia—as well ...
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(2002)Deep seismic reflection profiles collected across Proterozoic-Archean margins are now sufficiently numerous to formulate a consistent hypothesis of how continental nuclei grow laterally to form cratonic shields. This picture ...
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(1995)MacFlinCor was developed to process laboratory data gathered on fluid inclusions and to calculate isochores for geologically important fluids composed of H2O, CO2, CH4, NaCl, and N2. Within the program, interactive diagrams ...
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(2002)Variations in the bulk-rock compositions of primary high-Mg melts provide important constraints on the thermal and chemical structure of their mantle source regions. Picrites and komatiites of Archean to Recent age exhibit ...
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(1983)Linear extensional rift and rift-like structures have been generated many times during various periods of the Earth's history since early times. These structures have varied with time, however, in scale, morphology, ...
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(1988)Metallogenesis of manganese in space and time is reviewed here in the light of the progressive development of the atmosphere, the hydrosphere and the lithosphere attendant with the varied styles of tectonism. Economic ...
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(2000)The major-element composition of a grain of peridotitic Cr-pyrope garnet, coupled with a temperature estimate (TNi) derived from its Ni content, can be used to calculate the forsterite (Fo) content (100Mg/(Mg+Fe)) of the ...
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(2006)Sulfur isotope studies of post-Archean terrestrial materials have focused on the ratio 34S/32S because additional isotopes, 33S and 36S, were thought to carry little information beyond the well-known mass-dependent ...
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(1998)Melting experiments on fertile peridotite KR4003, a ‘pyrolitic’ composition, were made from 3 to 7 GPa in piston-cylinder and multi-anvil apparatus. Temperature gradients across the sample were minimized (<25°C), and the ...
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(2001)The processes that created the first large cratonic areas such as the Pilbara and the Kaapvaal remain poorly understood. Models based on the uniformitarian extrapolation of present-day arc volcanic processes to a hotter ...
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(2001)Monazite grains from nine different Precambrian rock samples and having concordant isotope dilution U-Pb and Th-Pb ages were used to develop and evaluate techniques for U-Pb, Th-Pb, and Pb-Pb isotopic dating using an ion ...
Now showing items 81-100 of 185