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Browsing ELibrary by Title
Now showing items 8022-8041 of 26297
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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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(2006)We have measured the Hf and Nd isotopic compositions of 38 basalts from the Ko'olau drill hole, Hawai'i. The basalts show limited variations in both 176Hf/177Hf and 143 Nd/144Nd (εNd varies from +4.2 to +7.3 and εHf from ...
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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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ISOTOPE CALIBRATED GREENLAND TEMPERATURE RECORD OVER MARINE ISOTOPE STAGE 3 AND ITS RELATION TO CH4 (2006)Large temperature variations on millennial time scales in Greenland characterised the last ice age. Abrupt warmings, known as Dansgaard–Oeschger (DO) events, can be traced in the δ18Oice record of Greenland ice cores. ...
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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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(2006)We report Sr, Nd, and Pb isotope compositions for 17 bulk-rock samples from the submarine Hana Ridge, Haleakala volcano, Hawaii, collected by three dives by ROV Kaiko during a joint Japan - US Hawaiian cruise in 2001. The ...
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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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(2006)The Rb-Sr isochron age of igneous ankerite-calcite and siderite carbonatites in central Tuva is estimated at 118 ± 9 Ma. The following ranges of initial values of O, C, Sr, and sulfide and S isotopic compositions were ...
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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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(2006)The present-day state as well as the history of isotope organic geochemistry is reviewed. Theoretical aspects of isotope fractionation in a system of complex organic molecules, fractionation of carbon isotopes in the ...
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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 ...
Now showing items 8022-8041 of 26297