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Now showing items 12097-12116 of 39126
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(1998)`Old' (Vendian–Early Cambrian) phosphorites of the World demonstrate `seawater-like' patterns in their rare-earth element (REE) distributions but are depleted in heavy REE. They also show a broad range of variation in total ...
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(1990)On the basis of new data we have confirmed our previous conclusion as to the extremely high level of biological activity in the Precambrian. On the other hand, linking this new fact with our previously established fact of ...
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(2001)We show that the Gibbs Sampler in the Gaussian case is closely linked to linear fixed point iterations. In fact stochastic linear iterations converge toward a stationary distribution under the same conditions as the classical ...
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(2003)A kinetic model for the rate of iron-hydrogen redox exchange in silicate glasses and melts has been derived from time-series experiments performed on natural rhyolitic obsidians. Cylinders of the starting glasses were ...
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(1997)Substitution of an oxalate molecule for two inner-coordination-sphere waters of Al(H2O)3+6 (aq) enhances, by a factor of ~ 102, the rate of exchange of water molecules from the inner-coordination sphere to the bulk solution. ...
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(2004)Calcium isotopic variations in carbonates, both marine organisms and inorganic systems, have recently been interpreted as a possible seawater temperature recorder [1,2]. In order to understand the behavior of calcium ...
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(2001)The structure and composition of hot particles from soils of the Chernobyl exclusion zone were studied. Regularities that govern the generation of water-soluble Cs-137 and Sr-90 species in soils contaminated by fuel particles ...
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(2000)Rate coefficients for steady exchange of oxygens between sites in the AlO4Al12(OH)24(H2O)127+(aq) (Al13) complex and bulk solution were determined over the temperature range of 9-19°C and 4.6 < pH < 5.4 using 17O-NMR. The ...
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(1996)The rates and stoichiometry of hornblende dissolution were studied in batch reactors in 0.01 M HOAc-LiOAc buffers at pH 3.6-4.0 and 25oC for three consecutive weathering cycles of 36, 45, and 34 days (total 115 days). The ...
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(1999)Aragonite was converted to calcite in dilute CaCl2 fluid at temperatures ranging from 50 to 100°C. Surface areas of aragonite and calcite seed crystals were varied by over an order of magnitude to permit independent ...
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RATES OF BACTERIA-PROMOTED SOLUBILIZATION OF FE FROM MINERALS: A REVIEW OF PROBLEMS AND APPROACHES (2000)Understanding the effects of bacteria on mineral weathering will require careful, controlled experiments in chemical reactors. Unfortunately, many of the details of protocol for such experiments have not yet been addressed. ...
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(1996)Feldspar dissolution rates were measured in flow-through reactors, over a pH range of 3-7, oxalic acid concentration of 0-8 m M, and feldspar compositional range of An0-An76. Dissolution rates in 0 and 1 m M concentrations ...
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(2003)Rates of steady exchange of oxygens between bulk solution and the largest known aluminum polyoxocation: Al2O8Al28(OH)56(H2O)26^18+(aq) (Al30) are reported at pH~4.7 and 32-40°C. The Al30 molecule is a useful model for ...
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(2004)Bulk dissolution rates for sediment from ODP Site 984A in the North Atlantic are determined using the 234U/238U activity ratios of pore water, bulk sediment, and leachates. Site 984A is one of only several sites where ...
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(2001)Singularities often cause trouble in tracing rays in inhomogeneous anisotropic media. The ray-tracing algorithms can break down in the vicinity of the singularities because the medium becomes nearly degenerate and the ...
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(2001)Analyses of travel times and amplitudes of crosshole georadar data provide estimates of the electromagnetic velocity and attenuation of the probed media. Whereas inversions of travel times are well established and robust, ...
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RAYLEIGH - TAYLOR INSTABILITIES FROM HYDRATION AND MELTING PROPEL 'COLD PLUMES' AT SUBDUCTION ZONES (2003)It is commonly thought that hot diapiric flows prevail in the mantle wedge above the subducting slab. However, hydration and partial melting along the slab can create a situation in which a Rayleigh–Taylor instability can ...
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RAYLEIGH SCATTERING BY AQUEOUS COLLOIDAL SILICA AS A CAUSE FOR THE BLUE COLOR OF HYDROTHERMAL WATER (2002)Thermal waters in hydrothermal ponds, bathing pools and the brines of geothermal electric power plants commonly have a characteristic blue color. Although many researchers have assumed that the blue color is due to a ...
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(1995)In the upper mantle and crust, common Earth models derived from seismic observations have density gradients greater than the adiabatic one, and the Brunt-Vaisala frequency indicates the gravitational instability of these ...
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(PANGAEA, 2010-06-14)
Now showing items 12097-12116 of 39126