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Browsing ELibrary by Title
Now showing items 13565-13584 of 20247
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(2000)The decay of the short-lived isotope 182Hf to the isotope 182W early in solar system history provides clues to the origin and evolution of the Earth and Moon. Current time-scales for the formation of proto-planets in the ...
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(1997)A new hydrous silicate phase with formula Mg1.71Fe0.177Al0.01Si0.965H0.332O4 has been synthesized at 1400°C and 17.5 GPa from a hydrous iron-rich mantle peridotite composition. The space group is Imma and unit cell parametersa ...
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(2005)The crystal structure of the rare mineral wakabayashilite was solved by direct methods using intensity data collected from a twinned crystal. This study revealed that, in spite of the strong hexagonal pseudosymmetry, the ...
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(2001)Products of the hydrothermal alteration of rocks and vertical zonality at the Kanimansur silver-polymetallic deposit (Tadjikistan) have been studied. On the basis of these studies, physicocochemical conditions of metasomatism ...
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(2002)The problem of the existence of a Tethys circumglobal current (TCC) in the Late Cretaceous continental geometry (Campanian) is addressed. Within an ocean model which is expected to strongly overestimate the wind-driven TCC ...
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(2003)Crystals of natron, Na2CO3·10H2O, were grown by slow evaporation of a saturated sodium carbonate solution at room temperature. A single-crystal fragment was measured on a CCD X-ray four-circle diffractometer at 110, 270 ...
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(2003)Magma degassing may occur either with no significant gas escape from the magma column, which corresponds with typical Plinian type eruptions, or with gas loss, which corresponds with typical effusive (dome-building) ...
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(2000)A review of published and newly measured densities for 40 hydrous silicate glasses indicates that the room-temperature partial molar volume of water is 12.0 ± 0.5 cm3/mol. This value holds for simple or mineral compositions ...
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(2000)To determine the effect of water on the rheology of depolymerized melts, we have measured the viscosity of two series of hydrated synthetic aluminosilicate melts analogous in bulk polymerization to tephritic and basanitic ...
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(2003)The kinetics of hydrogenation of dry synthetic forsterite single crystals was determined by performing experiments under hydrothermal conditions. The experiments were performed at 1.5 GPa, 1000 °C for 3 h in a piston-cylinder ...
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(2004)The dehydration rate of hydrous rhyolitic glasses at 475-875 °C was measured by in situ infrared (IR) spectroscopy in order to determine the diffusion coefficient of water in rhyolitic glasses. The IR spectra of glass thin ...
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(2002)Hartree-Fock and B3LYP NMR calculations were performed at the 6-311+G(2df,p) level on cluster models representing albite glasses using B3LYP/6 to 31G* optimized geometries. Calculation results on several well-known crystalline ...
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(1997)Water film diffusion is one of the mechanisms proposed to explain the deformation of rocks by pressure-solution during geological processes in the upper crust. This mechanism assumes that matter is dissolved inside the ...
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(2001)The impact of the spatial variability of porosity on the solution of the flow equation is investigated using standard first-order perturbation analysis. We use existing theories of flow in heterogeneous media and incorporate ...
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(2002)The solubility of H2O in melts along the join CaSi4O4-Ca(Ca0.5Al)4O9 (0, 3, and 6 mol% Al2O3) has been determined at 0.8 to 2.0 GPa and 1200 to 1400°C and compared with the solubility of H2O in melts along the joins ...
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(2001)Molecular water and hydroxyl groups are stable species in hydrous rhyolitic melts. To quantify the species concentrations we have used in situ IR spectroscopic measurements at 773-1073 K and 100-300 MPa in combination with ...
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(1996)The influence of water on the dynamics of the oceanic upper mantle is re-evaluated based on recent experimental constraints on the solubility of water in mantle minerals and earlier experimental studies of olivine rheology. ...
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(2003)Water-level fluctuations in wells open to artesian aquifers record pressure head disturbances caused by dilatation of the aquifer and reflect tide, barometric, and tectonic effects. Monitoring of atmospheric pressure and ...
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(2000)Multi-anvil experiments have been conducted in the MgO-SiO2-H2O system at pressures of 15-24 GPa and temperatures of 1200-1600°C to investigate the partitioning of water between mantle phases. The water contents were ...
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(2003)New constraints on the thermodynamic equation of state of water and the predicted water fugacity dependence of OH-solubility at elevated P-T conditions along with its influence on dislocation dynamics in olivine are reviewed. ...
Now showing items 13565-13584 of 20247