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Browsing ELibrary by Title
Now showing items 5560-5579 of 21934
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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 ...
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(2006)Based on results of studying the geochemistry and gold distribution of groundwaters in the Egor'evskoe gold-bearing area, a mechanism of gold mobilization, migration, and accumulation in mountain-forest landscape is proposed. ...
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(1989)The geotechnology of metals is a method of extracting them that involves solution of the useful ore components on site, either at the surface or underground, with subsequent industrial processing of the enriched solution. ...
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(2004)The results of a geochemical study of groundwater in the area of dawsonite mineralization are reported. Sodic bicarbonate groundwater with pH 7.3-9.2 and a salinity of 0.4-7.2 g/l occurs in this area. The equilibrium of ...
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(1989)We studied the fluorine distribution in hydrogeochemical dispersion halos of a cryolite-bearing rare-metal deposit of quartz-albite-microcline metasomatite association near a fault. We have established for the first time ...
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(2001)The Kamchatka peninsula, located in the far East of Russia, is characterised by frequent and strong seismic activity (magnitudes up to 8.6). For many years, samples for hydrogeochemical analyses have been collected with a ...
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(2003)The hydrogeochemical characteristics and zonation of the permafrost zone in the central part of the Yakutian diamond-bearing province formed mainly under the influence of cryogenic processes that occurred in the late ...
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(2002)Gas content in coal is not fixed but changes when equilibrium conditions within the reservoir are disrupted. Therefore, gas content distribution in coal varies laterally within individual coal beds, vertically among coal ...
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HYDROGEOLOGIC MODELING OF SUBMARINE GROUNDWATER DISCHARGE: COMPARISON TO OTHER QUANTITATIVE METHODS (2003)Submarine groundwater discharge (SGD) is approached differently by terrestrial hydrogeologists and marine scientists, including whether to incorporate recirculated seawater with freshwater in the definition. This paper ...
Now showing items 5560-5579 of 21934