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Browsing Геология России by Title
Now showing items 6945-6964 of 39195
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(2003)Hydrogen isotope exchange between water and orthosilicic acid (H4SiO4) was modeled using B3LYP calculations and classical transition-state theory. Configurations of 1, 2, 3 and 7 water molecules and H4SiO4 were used to ...
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(1997)Hydrogen isotope exchange between tourmaline and water has been studied experimentally over the temperature range of 800-350°C. The hydrogen isotope equilibrium fractionation factor between tourmaline and water may be ...
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(1989)A series of experiments was performed to determine the hydrogen isotope fractionation factors between water vapor and “water” dissolved as hydroxyl groups in rhyolitic and feldspathic glasses and melts. Experiments were ...
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(1996)The equilibrium hydrogen isotope fractionation factor (α) between kaolinite and water in the temperature range 330 to 0°C is 1000 ln αkaol-water = ?2.2 ? 106 T?2 ? 7.7. This monotonic expression is based on a combination ...
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HYDROGEN ISOTOPE FRACTIONATION IN LIPIDS OF THE METHANE-OXIDIZING BACTERIUM METHYLOCOCCUS CAPSULATUS (2002)Hydrogen isotopic compositions of individual lipids from Methylococcus capsulatus, an aerobic, methane-oxidizing bacterium, were analyzed by hydrogen isotope-ratio-monitoring gas chromatography–mass spectrometry (GC-MS). ...
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(2001)We determined the stable hydrogen isotope fractionation during progressive vaporization of three n-alkanes (heptane or C7, octane or C8, nonane or C9) at 24+/-1<space>°C, in an effort to understand the environmental isotopic ...
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(2003)The temperature and hydrogen isotope composition of the fumarolic gases have been studied at Kudriavy volcano, Kurile Islands, which is unique for investigating the processes of magma degassing because of the occurrence ...
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(2004)The source of water responsible for serpentinite formation is one of the oldest problems in geology. Some data on the isotopic composition of such metamorphic water can be obtained from the isotopic composition of the ...
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(2003)Distribution of hydrogen and carbon isotopes (D/H and 13C/12C) in the microbial systems CH4–H2O and CH4–CO2 was studied in differentworld’s regions. According to the distribution of these isotopes in the above systems, two ...
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HYDROGEN ISOTOPE RATIOS OF RECENT LACUSTRINE SEDIMENTARY N-ALKANES RECORD MODERN CLIMATE VARIABILITY (2004)Hydrogen isotope ratios were measured on n-alkanes (n-C12 to n-C31) extracted from recent lake surface sediments along a N-S European transect to test if modern climate variability is recorded in these biomarkers. δD values ...
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(1996)Hydrogen isotope fractionation factors were measured for coexisting brines and vapors formed by phase separation of NaCl/H2O fluids at temperatures ranging from 399-450oC and pressures from 277-397 bars. It was found that ...
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(1995)In order to discern the δDwater-δDCH4 relationship betweenCO22 reduction and acetate fermentation in freshwater environments where CH4 is produced from both CO22 and acetate, incubation experiments of a paddy soil were ...
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(2003)Hydrogen isotopic composition was studied for amphiboles and biotites from ore-bearing porphyries and host granitoids in the Mesozoic magmatic centers with Mo-porphyry mineralization of Shakhtama and Zhireken (eastern ...
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(2004)A new technique for performing long duration (up to 300 hours) high-pressure annealing experiments under water-saturated conditions has been developed. This technique has been used to investigate water-solubility and ...
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HYDROGEN SOLUBILITY AT CONSTANT TEMPERATURE (1300°C) IN ALBITE (NA2ALSI3O8) MELT AT HIGH PRESSURES (1988)The paper presents the first data on hydrogen solubility in albite melt at 1300° C and hydrogen partial pressures as high as 5 kb. The corresponding tests were run in a high-gas-pressure unit with internal heating and a ...
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(2002)We report major element, boron, lithium, and water (present as structurally bound hydroxyl) contents for a suite of ten mantle-derived olivine crystals, measured by electron microprobe, secondary ion mass spectrometry, and ...
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(2003)The response of the laumontite crystal structure to hydration/dehydration was evaluated using Rietveld refinements with XRD data collected under controlled PH2O conditions at ~28.5 °C. Refined water contents per unit cell ...
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(2003)Isothermal vapor sorption experiments under controlled partial pressures of H2O (between 0.1 and 30 mbar, at 23.4, 30.1, 49.5, 64.5, and 79.3 °C) and liquid water immersion calorimetry experiments at 25.0 °C were conducted ...
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(2001)We describe a technique for on-line reduction of water vapor carried in a He stream followed by continuous-flow mass spectrometry of evolved H2 gas. This technique is appropriate for analysis of D/H ratios of ~10-9 to ~5 ...
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(2001)Use of a simple, disposable apparatus allows the measurement of 2H/1H ratios in small quantities of potentially toxic organic materials without the release of hazardous compounds. The apparatus consists of welded nickel ...
Now showing items 6945-6964 of 39195