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Browsing ELibrary by Title
Now showing items 5252-5271 of 21934
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(2004)With uranium rich skeletons and density bands similar to their surface coral counterparts, deep-sea scleractinia are a promising archive of past climate. To improve the utility of fossil samples as monitors of deep ocean ...
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(1998)Ion microprobe analyses of as-grown{1014} faces of B-doped calcite single crystals show that boron oxyanions are incorporated differentially between nonequivalent vicinal faces that compose spiral growth hillocks. The ...
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(2002)Grus is an ill-defined product of deep weathering of coarse-grained rocks whose relationships to other weathering changes remain unclear. This paper attempts to address this issue by reviewing a number of examples of coarse ...
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(2002)A new genus of the family Ideliidae, Tshekardelia media gen. et sp. nov., is described from the locality of Tshekarda, the Lower Permian of the Ural Mountains. The species Sylvidelia latipennis Martynov, 1940, is redescribed.
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(2003)The great bulk of massive sulfide deposits in the Urals are related to Paleozoic basalt-rhyolite and basalt-andesite-dacite-rhyolite volcanic rock associations of ensimatic island arcs. According to Ivanov and Loginov [1], ...
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(2003)Assessing the impacts of climatic and, in particular, land use changes on rates of soil erosion by water is the objective of many national and international research projects. However, over the last decades, most research ...
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(2001)In the middle Miocene Badenian gypsum basin of the Carpathian Foredeep, west Ukraine, three main zones of gypsum development occur in the peripheral parts of the basin. Zone I consists entirely of stromatolitic gypsum ...
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(1996)The growth inhibiting and habit modifying effect of phosphonic acid derivatives (HEDP, ENTMP) and carboxylates (tartrate, citrate) on gypsum was investigated by in-situ Scanning Force Microscopy (SFM). Kinetic and morphological ...
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(2001)The engineering properties of gypsum/anhydrite change as a consequence of groundwater, pressure and heat. Gypsum and anhydrite may experience dissolution in the near-surface zone and along the discontinuities, creating ...
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(2000)Gyrotropic properties of clayey sands and sandy clays have been investigated by acoustic measurements at frequencies of about 400 Hz in up to 18 m deep boreholes, using a special contact sonde with piezoelectric transducers. ...
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(2000)The mechanism of origin of gyrotropy in a geologic medium has been simulated by models for grainy and thin-layered media having a dis symmetric microstructure. Calculation of displacements and stresses caused by a seismic ...
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(1995)After conversion of water to H2 gas with zinc for DH ratio determination, hydrogen gas can be absorbed by the zinc during cooling, resulting in H isotope fractionation. Thermal release and subsequent DH ratio determination ...
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(1996)Активность H2O в концентрированных NaCl р-рах измерялась при 600-900°C и 2-15 кбар и при концентрациях NaCl до насыщения по галиту при снижении равновесной дегидратации в бинарной системе синтетических брусит-периклаз. ...
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(2002)We present experimental results constraining water activity in H2O-N2 fluids containing 40–90 mol% water at pressures of 6–13 kbar and temperatures of 680–840 °C. In the experiments, the displacement of the brucite dehydration ...
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(1996)A total of 145 inclusions, trapped and isolated in Mg-rich olivine phenocrysts (Fo0.87–0.94) from basalts and ultramafic lavas, and representing the most primitive mantle melts known, have been analysed by ion microprobe ...
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(2004)The diffusion of water in dacitic and andesitic melts was investigated at temperatures of 1458 to 1858 K and pressures between 0.5 and 1.5 GPa using the diffusion couple technique. Pairs of nominally dry glasses and hydrous ...
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(2000)H2O diffusion plays a major role in bubble growth and volcanic eruption. We report a comprehensive study of H2O diffusion in rhyolitic melts and glasses. This new study and previous investigations together cover a wide ...
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(1997)Coral skeletons contain relatively little organic material and inorganically precipitated carbonate cement, although these quantities are enough to bias geochemical measurements. Preliminary treatment is therefore often ...
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(1987)On a cryogenic investigation solid H2S was successively observed after freezing CO2 in water-poor fluid inclusions in halite of Cambrian Siberian salts. Melting of a H2S solid phase occurs at nearly eutectic temperatures ...
Now showing items 5252-5271 of 21934