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Browsing ELibrary by Title
Now showing items 9862-9881 of 21934
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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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(2002)A new technique is presented where mass fractionation during Rb isotope dilution analyses by multi-collector inductively coupled plasma mass spectrometry is corrected for by measuring the amount of fractionation on admixed ...
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(1996)Rb-Sr ages of melt inclusions in quartz have the potential to provide a unique and illuminating record of the differentiation and accumulation history of silicic magmas. Here we report the first Sr and Nd isotopic measurements ...
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(2006)Biotite is widely used for Rb-Sr and K-Ar isotopic dating and influences Sr isotope geochemistry of hydrological regimes. The isotopic system of biotite behaves diversely in response to surface weathering; i.e. the complete ...
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(2001)Rb-Sr and Sm-Nd isotope compositions of seven garnet pyroxenite xenoliths from Udachnaya and Mir kimberlites, Siberia, are presented. Five of them are websterites, and the other two are clinopyroxenites. The websterite ...
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(1995)Various diffusion models can be applied to Rb-Sr systems in cooling rocks. It is argued that a closed-system diffusion-controlled model, involving local equilibrium along grain boundaries, is most appropriate for describing ...
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(2004)As was determined by the Rb-Sr method, the barren biotite granite of the Oldanda and Khangilai plutons, the rare-metal granites at the Spokoinoe, Orlovka, and Etyka deposits and the Ary-Bulak ongonite in eastern Transbaikalia ...
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(2001)Isotopic dates for upper horizons in one of the Riphean reference sections of northern Eurasia are calculated on the basis of the Rb-Sr systematics of fine size-variable subfractions (SF) of clay minerals. The SFs with ...
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(1995)Analysis of Rb-Sr isotopic and elemental signatures of fluid inclusions is technically demanding, but it offers enormous potential in elucidating the timing, sources, and geochemical reaction paths of fluids in the Crust. ...
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(2001)
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(1994)A combined mineralogical, chemical, morphological and Rb-Sr isotopic study of “blue clays” from the Lower Cambrian Lontova unit shows that these minerals contain three generations of illite. The oldest detrital 2M illite ...
Now showing items 9862-9881 of 21934