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Browsing ELibrary by Title
Now showing items 1545-1564 of 26297
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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 ...
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(2006)To date the formation of ruby deposits and link it to the regional metamorphism associated with Tertiary Himalayan orogenesis, 40Ar-39Ar stepwise heating experiments were performed on single grains of phlogopite syngenetic ...
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(2004)It is known that artificial impact on oil-and-gas reservoirs frequently induces low-magnitude earthquakes. The problems of induced seismicity are very interesting due to their fundamental importance in the theory of ...
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(2001)The principal new feature in the Cenozoic evolution of the Northwest Pacific is based on the fact that two arc terranes of Upper Cretaceous–Paleogene age were incorporated in the Kamchatka orogen during the early Tertiary ...
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(2006)The Southern Urals of Russia contain what is arguably one of the best-preserved examples of an arc-continent collision in any Paleozoic orogen. The arc-continent collision history recorded in the rocks of the Southern Urals ...
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(2004)Tectonically active remnants of Neo-Tethys represented by Mediterranean and western Pacific marginal seas are characterized by rapidly propagating backarc extension episodes. These appear to be triggered by random subduction ...
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(2003)We evaluate anaerobic oxidation of methane (AOM) in the Black Sea water column by determining distributions of archaea-specific glyceryl dialkyl glyceryl tetraethers (GDGTs) and 13C isotopic compositions of their constituent ...
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(2006)We investigated the distributions and δ13C values of lipid biomarkers in authigenic methane-related carbonate crusts formed on eastern Mediterranean mud volcanoes. A highly diverse suite of microbial membrane lipids was ...
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(2004)The Black Sea and the Cariaco Basin are both large, euxinic marine basins in which methane concentrations are high and where anaerobic oxidation of methane (AOM) is an important part of the carbon cycle. AOM can be recognized ...
Now showing items 1545-1564 of 26297