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Browsing ELibrary by Title
Now showing items 1196-1215 of 21934
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(2004)Volgian aptychi from the Russian Platform are described and figured for the first time. The Lower Volgian klimovi Zone and the uppermost Kimmeridgian beds contain Lamellaptychus submortilleti Trauth, 1938. The pseudoscythica ...
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(2004)Evident from the presented results, Riphean sedimentary rocks similar to the experimental ones may generate, in the course of natural OM maturation, approximately 40 kg/t of liquid and 50 kg/t of gaseous hydrocarbons ...
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(1995)The petrological and mineralogical characteristics of the unusual CM2 chondrite, Bells, have been investigated in detail by scanning electron microscopy (SEM), electron microprobe analysis (EPMA), and transmission electron ...
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(2001)ALH 81002 is a CM carbonaceous chondrite that has petrographic characteristics suggesting that it experienced a high degree of aqueous alteration, but has entirely escaped parent body brecciation. In this study, we report ...
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(2003)Uptake of cadmium ions from solution by a natural Mg-containing calcite was investigated in stirred flow-through reactor experiments. Input NaCl solutions were pre-equilibrated with calcite (pH 8.0) or not (pH 6.0), prior ...
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(1997)The subsurface mobility of metals and polychlorinated phenols occurring together in contaminated groundwaters may be significantly affected by the extent of aqueous complexation between them. However, no previous experimental ...
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(2002)The effect of pressure and temperature on the dihedral angles of aqueous fluid in a pyrope matrix was investigated. Experiments were performed on an H2O-pyrope system in a multianvil apparatus over the pressure and temperature ...
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(1997)Aqueous geochemical techniques and analysis of pyrite surfaces have been used to study element partitioning between the aqueous and solid phase and to infer mechanisms that limit the concentrations of elements in porewater ...
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(2001)Organic matter, water, and minerals coexist at elevated temperatures and pressures in sedimentary basins and participate in a wide range of geochemical processes that includes the generation of oil and natural gas. A series ...
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(1993)Hydrothermal systems associated with oceanic spreading centers are now recognized as relatively common phenomena, and the organic chemical alterations occurring there are rapid and efficient. In the marine hydrothermal ...
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(2001)The solubility of boehmite, γ-AlOOH, was measured in a modified hydrogen-electrode concentration cell, which provided continuous in situ measurements of hydrogen ion molality over the range of ionic strengths from 0.1 to ...
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(2001)The solubility of pure synthetic boehmite (γ-AlOOH) has been measured over a wide range of pH (2-10, depending on temperature), and temperature (100-290°C) at 0.03 mol . kg-1 ionic strength (NaCl) in a hydrogen-electrode ...
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(1997)Previous experiments have indicated increased dissolution rates of quartz in the presence of oxalate, although the mechanism responsible is unclear. Possible explanations include a decrease in solution saturation state due ...
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(1998)The solvation environment of aqueous yttrium in chloride bearing solutions was characterised by EXAFS spectroscopy at temperatures from 25 to 340°C. Four solution compositions were considered containing 0.1 M YCl3, 0.1 M ...
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(2002)Groundwater overexploitation and aquifer overexploitation are terms that are becoming common in water-resources management. Hydrologists, managers and journalists use them when talking about stressed aquifers or some ...
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(2002)Use of artificial neural networks (ANNs) is becoming increasingly common in the analysis of groundwater hydrology and water resources problems. In this research, an ANN was developed and used to estimate aquifer parameter ...
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(2001)Several important biogeochemical reactions are known to occur near the interface between aquifer and aquitard sediments. These reactions include O2 reduction; denitrification; and Fe3+, SO42-, and CO2 (methanogenesis) ...
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(2002)The paper presents results of Ar and He isotopic studies in rocks and sulfide ores of the Late Precambrian Dovyren dunite-troctolite layered intrusion (Northern Baikal region). The 3He/4He and 40Ar/36Ar ratios in the ...
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(2002)The relative incompatibility of Ar and K are fundamental parameters in understanding the degassing history of the mantle. Clinopyroxene is the main host for K in most of the upper mantle, playing an important role in ...
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(2001)The effect of dissolved water on the diffusivity of Ar in glasses and melts of rhyolitic and albitic compositions was investigated experimentally at pressures up to 1500 MPa and water contents of 0.1-5 wt%. The data for ...
Now showing items 1196-1215 of 21934