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Browsing ELibrary by Title
Now showing items 14029-14048 of 21934
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(1998)The solubility of zincite in mildly to strongly acidic aqueous solutions, according to the reaction ZnO + 2H+ # Zn2+ + H2O, has been measured at ionic strengths of 0.03-1.0 (stoichiometric molal basis) from 50 to 290°C at ...
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(2001)Our detailed petrographic study of the Early Proterozoic metapelites of the Tim-Yastrebovskaya structure resulted in distinguishing the following four metamorphic zones: garnet-chlorite, staurolite-andalusite. staurolite ...
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(2001)A scheme of small mammal (vole) zones is proposed for the Quaternary of Eastern Europe. The zonation is based on the evolutionary appearance of new forms in the Borsodia-Prolagurus-Lagurus, Mimomys-Arvicola, and ...
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(2001)The article highlights the mineral zonality at the Grachevskoe, Kosachinskoe, and Shokpak-Kamyshovskoe uranium ore fields (Northern Kazakhstan) localized in low-temperature sodic metasomatites. The setting of these fields ...
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(1993)The Upper Cretaceous oceanic and island-arc terranes of Northeastern Kamchatka (Russia) are intruded by numerous ultramafic and mafic to intermediate plutons. Ultramafic plutons north of Epilchik Lake show a concentric ...
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(1992)The accumulation of information about the stratigraphic ranges and areal distribution of various groups of fauna and flora has made it possible to pass onto the zonal differentiation of all the systems of the Phanerozoic ...
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(2003)In the mid-Middle Miocene (Konkian Phase), the Eastern Paratethys reestablished a wide connection with the World Ocean. This resulted in the migration of the marine polyhaline molluskan fauna from the Mediterranean. The ...
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(2000)The presence of Zr isotope anomalies in the early solar system is demonstrated with the identification of 92Zr excesses and 96Zr deficits in several chondrites and the CAI Allende inclusions. The isotopic composition of ...
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(2000)A survey of global ocean island basalt geochemistry shows a remarkably strong linear correlation (average rmr/rm2 = 0·95) between Zr and Nb concentrations. Fractional crystallization explains neither the range in Zr and ...
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(2000)A survey of global ocean island basalt geochemistry shows a remarkably strong linear correlation (average r2 = 0·95) between Zr and Nb concentrations. Fractional crystallization explains neither the range in Zr and Nb ...
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(2003)The Palaeoproterozoic Kuetsjarvi Sedimentary Formation from the Pechenga Greenstone Belt, NW Russia, has been studied with the purpose of determining δ13Ccarb and δ18Ocarb values in various carbonate phases from genetically ...
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(1998)Analyses of the organic compounds in the Murchison meteorite have led to a greater understanding of the nature of extraterrestrial organic materials. However, the relationship between low and high molecular weight material ...
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(1998)Analyses of the organic compounds in the Murchison meteorite have led to a greater understanding of the nature of extraterrestrial organic materials. However, the relationship between low and high molecular weight material ...
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(2002)Low-molecular-weight (LMW) aqueous organic acids were generated from six oil-prone source rocks under hydrous-pyrolysis conditions. Differences in total organic carbon-normalized acid generation are a function of the initial ...
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(2001)Soil organic carbon can be labelled at natural abundance by the cultivation of C4 plants, e.g. maize, on soils which have been previously cropped with isotopically distinct C3 plants, e.g. wheat. Particle-size fractions ...
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(2004)We examined δ13C values of shallow and deep-water scallop shells as well as δ13C of dissolved inorganic carbon (DIC) from the Bay of Brest in western Brittany. Time series of shell calcite δ13C do not reflect seasonal ...
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(1998)δ18O values of both carbonate (18.7-25.1%%) and phosphate (15.1-16.7%%) components of the francolite from the fossil brachiopod shells are interpreted as the result of a partial resetting of pristine isotopic compositions. ...
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(2002)Belemnite guards of Cretaceous and Jurassic age were found to contain varying amounts of quartz deposited both on the external surface and inside the rostrum. The oxygen isotopic composition of coexisting carbonate, quartz ...
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(1996)The whole-rock δ18O of mudrocks, as well as the δ18O of the clay-sized silicate fraction, does not change in any systematic manner over Paleozoic and late Proterozoic time. Therefore, the δ18O of the ocean has not changed ...
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(1987)The present paper studies the effect of the pH2 on the solubility of minerals in terms of phase diagrams of μ$-H$(2)$/ (pH2) versus X (by analogy with the μH+ (pH)-X) diagrams discussed previously. As an example, the authors ...
Now showing items 14029-14048 of 21934