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Browsing ELibrary by Title
Now showing items 12591-12610 of 21768
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(1995)The ratio of dibenzothiophene to phenanthrene and the ratio of pristane to phytane, when coupled together, provide a novel and convenient way to infer crude oil source rock depositional environments and lithologies. Such ...
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(2003)The ratios of coexisting marine phyla (p), classes (c), orders (o), families (f), and genera (g) through the Phanerozoic can be described as an exponential trend. The number of genera can be calculated as an interval between ...
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(2004)Thus, Rb-Sr isotopic-geochemical investigations indicate the Paleoproterozoic (1.7 Ga) age of wall-rock metasomatites, beresite aureoles, and, presumably, mesothermal gold mineralization of the Taloveis deposit. The formation ...
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(1998)The Re-Os isotope sytem, based on the long-lived β − transition of 187 Re to 187 Os, has matured to wide use in cosmochemistry and high-temperature geochemistry. The siderophilic/chalcophilic behavior of Re and Os is ...
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(1991)The isothermal (750°C) experiments of Lagache and Dujon (1987) reveal that the partitioning of Sr between plagioclase feldspar and hydrothermal solutions is a funtion of the anorthite (An) content of the plagioclase, ...
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(2001)Specimens of tobermorite 11Å from Wessels mine, South Africa, an 'anomalous' tobermorite, and from BaÏ scenov, Urals, Russia, a 'normal' tobermorite, have been studied through X-ray diffraction. Their structural disorder, ...
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(1992)This chapter discusses the recognition of the soft-sediment deformations as early-diagenetic features. The early-diagenetic stage— that is, the period between sedimentation and lithification, includes some important changes ...
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(2001)The recovery and radiation of the Early Jurassic ammonoid morphospace, as represented by nine morphologic groups identified in an earlier study, are traced through the first 36 subzones of the Hettangian to Domerian time ...
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THE RED LUMINESCENCE EMISSION OF FELDSPAR AND ITS WAVELENGTH DEPENDENCE ON K, NA, CA - COMPOSITION (2002)Feldspar specimens covering the whole Or-Ab-An ternary have been investigated by cathodoluminescence (CL), photoluminescence (PL), radioluminescence (RL) and radiophosphorescence (RP) spectrometry. A red luminescence ...
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(2004)The redox state variation of orogenic granitoids along convergent plate margins is examined in the Phanerozoic Circum-Pacific Belt and in some Cryptozoic terranes. The Phanerozoic granitoids of the NW and NE Pacific Rims ...
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(1999)Spinel peridotites from a variety of island arcs have been utilised to calculate the redox state of the mantle wedge above subduction zones. Oxygen fugacities (fO2 values) calculated from the ferric iron content of spinels, ...
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(2003)The reactions of Au3+ with green rust, stibnite, pyrite, and chalcopyrite were investigated in the laboratory and the size of the gold clusters formed was measured using extended X-ray absorption fine structure (EXAFS) ...
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(1998)The rates of the reduction of Cr(VI) with Fe(II) were measured in NaCl, NaClO4, and natural seawater as a function of pH (1.5–8.7), temperature (5–40°C) and ionic strength (I = 0.01–2 M). The pseudo first-order rate constant ...
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(1998)The rates of the reduction of Cr(VI) with Fe(II) were measured in NaCl, NaClO4, and natural seawater as a function of pH (1.5-8.7), temperature (5-40°C) and ionic strength (I = 0.01-2 M). The pseudo first-order rate constant ...
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(2004)Geochemical composition of sedimentary assemblages is determined by the interaction of specifics of provenances, weathering conditions, mass transfer, sedimentation, metamorphism, and other factors. The role of geodynamic ...
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THE REFERENCE SECTION OF SILURIAN-LOWER DEVONIAN BOUNDARY DEPOSITS IN THE EASTERN SLOPE OF THE URALS (2000)Carbonate and volcanogenic-sedimentary deposits composing the upper Pridolian Substage and Lochkovian stages in the area between Boksity Station in the south to the Sos'va River in the north (eastern slope of the northern ...
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(2001)The following Lower-Upper Permian brachiopod zonation is established in the Baraiy River basin (the western Verkhoyansk region): (1) the Megousia kuliki Zone bearing the associated Neouddenites-Tumaroceras yakutorum goniatite ...
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(1996)The 40 years of activity of the Interdepartmental Stratigraphic Committee (ISC) of Russia for the benefit of the regional stratigraphy in the country are briefly reviewed; the most significant results of the work of the ...
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(1988)The results of relevellings made in 1948 and 1969-1975 along the Obi-Hingou profile, which is a part of the Garm test area, are analysed. Different characteristics of slow movements in the separate parts of the levelling ...
Now showing items 12591-12610 of 21768