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Now showing items 6082-6101 of 42285
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(2003)The behavior of Na and K during evaporation from chondrule composition melts was studied using a vacuum furnace. Though Na is the less volatile of the two as an element, it is lost more rapidly than K from silicate melts. ...
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(1986)Partitioning of Mg and Fe between coexisting biotite and orthopyroxene has been experimentally determined at temperatures 700, 750 and 800° C and 490 MPa total pressure in the system KAlO2-MgO-FeO-SiO2-H2O. Oxygen fugacity ...
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(2002)The exchange of Fe2+ and Mg2+ between orthopyroxene and sapphirine has been investigated at pressures 7-16 kbar and temperatures 850-1300°C using a piston cylinder apparatus for the synthetic and natural systems. This ...
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(1982)The Fe-Mg-Ca-distribution was investigated in synthesis experiments and with the mineral assemblage orthopyroxene+clinopyroxene+quartz. The phase compositions were identified by X-ray diffraction and, where possible, by ...
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(2006)Adsorption of germanium on goethite was studied at 25 °C in batch reactors as a function of pH (1-12), germanium concentration in solution (10-7 to 0.002 M) and solid/solution ratio (1.8-17 g/L). The maximal surface site ...
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(2004)The behavior and distribution of gold in shock-metamorphosed rocks were studied experimentally. A gold-bearing pyrite-quartz (Py-Qtz) mixture was affected by shock waves by the method of impulse-shock loading of powdered ...
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(1999)Humic acid adsorption onto bacterial and mineral surfaces was measured as a function of pH and humic:surface ratio. The bacterial species used was the aerobic gram-positive species Bacillus subtilis, and Al mineral surface ...
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(2003)Apatite dissolution experiments were conducted using both a fluidized bed and stirred tank reactor over a range of pH, temperature, solution saturation state, and on non-carbonated and carbonated apatite compositions: ...
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(2002)Variations in bulk Mg/Si ratios in the various groups of chondritic meteorites indicate that Mg/Si fractionation occurred in the primitive solar nebula. Enstatite (MgSiO3) evaporates incongruently forming forsterite (Mg2SiO4) ...
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(2001)Interaction between plagioclase amphibolite and synthetic glass of haplogranitic composition in the presence of aqueous fluid was studied experimentally at 800-950°C and 7 kbar. Amphibolite is replaced by granite with the ...
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(1999)Kyanite steady state dissolution rates were measured in mixed flow reactors as a function of aqueous aluminum and silica concentration at pH 1.6 to 2.2 and at temperatures from 108 to 194°C. Aqueous silica and aluminum ...
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(1998)The solubilities of pure synthetic La and Gd hydroxides were measured in aqueous solutions over a wide range of pH (5-9.5) and temperature (40-150°C). The regression of these data is used to determine the first dissociation ...
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(2001)Silicate-carbonate liquid immiscibility was experimentally studied with application to the modeling of carbonatite melt separation from foid silicate magmas. Main attention was paid to modeling silicate-carbonate liquid ...
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(2004)Evaluation of the effects of small repetitive earthquakes on the strength parameters of rock joints in active seismic zones is of interest of the designers of underground constructions. In order to evaluate these effects, ...
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(1998)The thermodynamic stabilities of the aqueous and surface Al-aniline and Al-2-chloroaniline complexes were investigated using solubility and adsorption experiments. Aqueous complexation was studied by measuring the solubility ...
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(1995)The following reactions have been reinvestigated in order to resolve conflicting evidence regarding tetrahedral AlSi disorder in muscovite, KAl2(AlSi3)O10(OH)2:muscovite + quartz = andalusite + sanidine + H2O ;muscovite = ...
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(2005)The subsurface mobility of Np is difficult to predict in part due to uncertainties associated with its sorption behavior in geologic systems. In this study, we measured Np adsorption onto a common gram-positive soil ...
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(1996)Melting temperatures of biotite-orthopyroxene-quartz assemblages were determined experimentally using biotites with various Fe-contents in the system KAlO2-MgO-FeO-SiCO2-H2O, in the pressure range 100-500 MPa and under the ...
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(2006)We determined the solubility limit of Pt in molten haplo-basalt (1 atm anorthite-diopside eutectic composition) in piston-cylinder and multi-anvil experiments at pressures between 0.5 and 14 GPa and temperatures from 1698 ...
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(1998)The solubility of sulfur in gaseous hydrogen sulfide has been studied in the H2S-S system. Experiments were carried out at temperatures between 50 and 290°C and pressures up to 200 bars. The experimentally determined ...
Now showing items 6082-6101 of 42285