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Browsing Геология России by Title
Now showing items 7625-7644 of 39126
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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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(PANGAEA, 2013-06-13)Zircons from the oldest magmatic and metasedimentary rocks in the Podolia domain of the Ukrainian shield were studied and dated by the U-Pb method on a NORDSIM secondary-ion mass spectrometer. Age of zircon cores in enderbite ...
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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; ...
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(1996)Pristine conodonts (CAI =< 1.5), inarticulate brachiopods, and conulariids, all from a single hand sample of Ordovician limestone, define a co-varying trend of 87Sr/86Sr and Sr concentration. Most of the apatitic fossils ...
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(1987)The Dauletabad-Donmez gas field is in the southern part of the Amu Dar'ya oil and gas province. The identification of the origin and sources of H2S in gases of the Dauletabad-Donmez field is very important, particularly ...
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(2019-01)The Kamchatka Peninsula of eastern Russia is currently one of the most volcanically active areas on Earth where a combination of > 8 cm/yr subduction convergence rate and thick continental crust generates large silicic ...
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(1993)We present a tightly controlled and comprehensive set of analytical data for the 250-Ma Siberian flood-basalt province. Consideration of major- and trace-element compositions, along with strontium, lead and neodymium ...
Now showing items 7625-7644 of 39126