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Browsing ELibrary by Title
Now showing items 6203-6222 of 22185
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(2000)Carbon-isotope compositions of n-alkanes, pristane and phytane, and total organic carbon were measured and compared against isotopic trends of coeval alkadienones from Miocene sediments containing very low organic-carbon ...
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(1988)The authors studied ten peridotite inclusions from basalts of the central Vitim Plateau namely eight granite-containing and one spinel-containing 1herzolite from recently discovered alkalic picrite tuff, thought to be of ...
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(1989)Isotope data should help to clarify the problem of the origin of water participating in hydrothermal activity. Thus, isotope data suggest that water participating in calcalkalic magma generation is of crustal (oceanic) ...
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(1989)Hydrogen is a common impurity in diamonds, where its average concentration is 0.01 percent; but it may reach levels as high as 0.5 percent in carbonadoes and bort. Determining the isotopic composition of this hydrogen is ...
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(2003)Experimental diffusion couples were used to study chemical diffusion between molten rhyolite and basalt with special emphasis on the associated fractionation of calcium and lithium isotopes. Diffusion couples were made by ...
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(1999)Laboratory diffusion experiments specifically designed to resolve small differences in the relative mobility of isotopes were used to measure the mobility of 76Ge vs. 70Ge in molten GeO2 (1400°C, 0.5 GPa) and 48Ca vs. 40Ca ...
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(2001)Isotope fractionation during sulfate reduction was explored for natural populations of sulfate-reducing bacteria. High fractionations of 30%% to 40%% were produced when the natural population metabolized with indigenous ...
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(1991)This paper deals with a model of carbon isotope fractionation presumed to accompany the movement of mantle fluids. In the first part of the article, the experimental data and the relationships revealed are generalized and ...
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(2001)This study is based on the isotope-geochemical characteristics of oils from 53 fields in the South Caspian Basin - from Upper Cretaceous, Eocene, Oligocene-Lower Miocene (Maykop), middle and the Upper Miocene (Diatom) and ...
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(2003)This paper considers applications and limitations of the new branch in isotope geochronology that is concerned with the estimation of the temperature conditions of superimposed postcrystallization processes from the analysis ...
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(2004)The available geological, geochronological and isotopic data on the felsic magmatic and related rocks from South Siberia, Transbaikalia and Mongolia are summarized to improve our understanding of the mechanisms and processes ...
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(1990)The isotopic makeup of carbon in marine carbonates exhibits quasiperiodic variations in time. Since these changes were controlled by the global balance of organic and carbonate carbon in the oceans, reliably dated isotope ...
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(1999)Carboniferous brachiopods from western Europe and the former USSR have been utilized as carriers of isotopic proxy signals for paleoceanography and paleoclimatology during the assemblage of Pangea. This is of particular ...
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(2001)Salinization of water resources is one the most widespread processes that degrades water-quality and endangers future water exploitation. In many areas, particularly in arid and semi-arid zones, ground-water salinization ...
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(1998)Experiments were performed to test the viability of using isotope-ratio-monitoring gas-chromatography mass spectrometry (irm-GCMS) as a means for isotopic analysis of nanomole quantities of O2 released in a vacuum system ...
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(2001)Isotopic dating showed that rhyolites of the Kushmurun graben are divisible into two groups different in age. One group is close to the Induan-Olenekian boundary in its chronostratigraphic position and has K-Ar and Rb-Sr ...
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(2003)A possible source of moisture for the ground ice was determined from the sulfur and carbon isotopic tests of meltwater. The starting material for the investigation was collected in 1998-2000 from four tabular ground ice ...
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(1999)We report elemental and isotopic analyses of Fe, Ni, and Cr in type I deep-sea spherules with masses ranging from 43 to 256 μg. We measured (1) the isotopic compositions of Fe and Cr by thermal ionization mass spectrometry; ...
Now showing items 6203-6222 of 22185