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Browsing Геология России by Title
Now showing items 5306-5325 of 40116
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(2003)We determined activity-composition relationships in Pt-Cr and Pt-Fe-Cr alloys at 1300°C experimentally and used the results to constrain the thermodynamic properties of chromite-picrochromite spinels. The Pt-Cr binary is ...
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(2004)An understanding of the activity-composition (a-X) relations and phase equilibria of halite-bearing, mixed-species supercritical fluids is critically important in many geological and industrial applications. We have performed ...
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(2001)Radionuclides are present in contaminated surfacial waters, but their behavior in the presence of natural organic acids is poorly known. Dissociation constants for the strontium acetate (SrCH3COO+) and cesium acetate ...
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(2005)Experiments have been carried out to determine the temperature, oxygen fugacity (fO2) and compositional dependence of the tracer diffusion coefficient (D) of calcium in olivine. These data constrain the diffusion coefficient ...
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(2002)The P-T conditions of both equilibria were determined precisely by reversal experiments in a piston-cylinder apparatus. On the basis of 8 experiments. brackets for the rutile-magnesite-geikielite equilibrium are 7.0-7.1 ...
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(2000)The primary goal of this investigation was to derive a set of expressions that can be used to calculate the amphibole-melt partitioning behavior of the rare earth elements (REE) and the high field strength elements (HFSE) ...
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(2001)Martinez et al. bracketed the decomposition reaction of dolomite to aragonite + magnesite between 5.0 and 5.5 GPa at 600 C using in-situ XRD in a multi-anvil apparatus. They then extrapolated their results using the available ...
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(1996)The carbonation reaction CaMg(CO3)2 (dolomite)+2SiO2 (coesite)=CaMgSi2O6 (diopside)+2 CO2 (vapor) has been determined experimentally between 3.5 and 6 GPa in a multiple-anvil, solid-media apparatus. This reaction, a candidate ...
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(1998)The P-T equilibrium curve of the reaction of magnesite + enstatite = forsterite and CO2 was determined in the ranges 6-25 kbar and 700-1100 degrees C by 53 reversed experiments carried out in 1.91 cm diameter piston-cylinder ...
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(1996)We report here new data on the solubility of Au in silicate melts of anorthite-diopside eutectic composition at a wide range of oxygen fugacities, from pure oxygen to 10−8 atm, and at a temperature range of 1300 °C to 1480 ...
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(1999)The dominant oxidation state of rhenium in high-temperature, chloride-bearing hydrothermal solutions at geologically reasonable oxygen fugacities has been experimentally determined to be +4, although a small percentage of ...
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(2006)The solubility of (i) Au(cr), (ii) mixtures of crystalline Ag2S-Ag3AuS2, and (iii) Ag3AuS2 (uytenbogaardtite)-AgAuS (petrovskaite) was measured at 25 °C, 1 bar, whereas the solubility of AgAuS(cr) was measured at 91-250 ...
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(2003)The solubility of silver sulphide (acanthite/argentite) has been measured in aqueous sulphide solutions between 25 and 400°C at saturated water vapour pressure and 500 bar to determine the stability and stoichiometry of ...
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(1995)A new sodium-selective glass electrode was used to measure the association constants of the sodium-sulfate (NaSO4−) and sodium-borate (NaB(OH)40) ion pairs at temperatures from 50° to 200°C. These data were used to generate, ...
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(1989)The thermal equilibrium for the reaction Fe-staurolite+quartz=almandine+sillimanite+H
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EXPERIMENTAL DETERMINATION OF TRACE ELEMENT PARTITION COEFFICIENTS IN CULTURED BENTHIC FORAMINIFERA (2001)We present the first trace metal partition coefficients obtained from reproducing cultures of deep-sea benthic foraminifera. Paleoceanographically important species, including juvenile Bulimina marginata, Cibicidoides ...
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(1995)In order to more fully establish a basis for quantifying the role of amphibole in trace-element fractionation processes, we have measured pargasite/silicate melt partitioning of a variety of trace elements (Rb, Ba, Nb, Ta, ...
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(2005)This study performed equilibrium experiments in order to evaluate previously proposed formulations of the garnet (Grt)-clinopyroxene (Cpx) thermometer as applied to eclogites. The starting material is fine-grained powder ...
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(1996)Partition coefficients of H2O between β and γ phases of olivine stoichiometry and coexisting ultra mafic melt have been estimated to be > 0.1 +/- 0.04 (1σ) and 0.04, respectively; based on experiments at 15-16.5 GPa, ...
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(2005)Montmorillonite was equilibrated with high normality Cl - solutions to assess the possible presence of MeCl + ion pairs in smectite interlayers which is suggested by chemical modeling of cation exchange experimental studies. ...
Now showing items 5306-5325 of 40116