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Browsing Геология России by Title
Now showing items 14070-14089 of 39124
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(1996)A number of experiments have been carried out using Cl-, Na-, K-, As-, Sn-, Bi-, Pb-, Te-bearing solutions at temperatures between 240 and 500°C in order to synthesize platinum-group minerals (PGM) and to study their ...
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(1995)The synthesis of polycyclic aromatic hydrocarbons (PAHs) from benzene by shock waves was studied in order to search for a novel possibility of PAH formation under cosmochemical conditions. Shock waves generated by projectile ...
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(1996)Some recent investigations of black shales reveal platinum-group element (PGE) concentrations in the ppm range. The low temperature nature of these mineralized sediments and their composition stimulated this first attempt ...
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(2003)In order to evaluate the stability of Mg-Ca garnets at P = 2.5 GPa/T = 800-1500 °C, some experiments were performed using both natural and synthetic starting materials. Particular attention was paid to the investigation ...
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(2004)Diamond was synthesized at high temperature and pressure in a Walker-style multianvil apparatus from various supercritical C-O-H rich fluid compositional systems. Depending on the type and amount of impurities added to the ...
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(2003)We document experiments on a natural metapelite in the range 650–775°C, 6–14 kbar, 10 wt?% of added water, and 700–850°C, 4–10 kbar, no added water. Staurolite systematically formed in the fluid-present melting experiments ...
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(1999)Thallium leucite, TlAlSi2O6, has been synthesized at 450°C for 7 days, under ambient conditions, by the transformation of dehydrated analcime NaAlSi2O6 in the presence of excess TlCl. This substitution of Tl for Na leads ...
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(2001)Tourmaline has been synthesized hydrothermally at 200 MPa between 300 and 700 °C from oxide mixtures with Mg–Al ratios for the end members dravite NaMg3Al6(Si6O18)(BO3)3(OH)3(OH) and Mg-foitite ❏(Mg2Al)Al6 (Si6O18)(BO3)3(OH)3(OH). ...
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(1996)Solid solutions along the magnesite-siderite join have been synthesized from mechanical mixtures of iron oxalate and basic magnesium carbonate using hydrothermal synthesis techniques at 500oC and about 2 kilobars. The ...
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(2003)The thermochemistry of well-characterized synthetic K-H3O, Na-H3O and K-Na-H3O jarosites was investigated. These phases are solid solutions that obey Vegard's law. Electron probe microanalyses indicated lower alkali and ...
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(2004)This work reports the synthesis of ferri-clinoholmquistite, nominally □Li2(Mg3Fe3+2)Si8O22(OH)2, at varying f O 2 conditions. Amphibole compositions were characterized by X-ray (powder and single-crystal) diffraction, ...
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(2002)End member boromuscovite, with nearly the ideal composition, was synthesized as a single phase from mixtures of its own composition, or with excess boron and water, at high pressures of between 15 and 30 kbar at 700 °C. ...
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(2000)Results of experimental investigations in the dry system PtS-PdS-NiS at 1100°C, 1000°C, and 900°C are presented. The phases observed at 1100°C are "cooperite" and a melt, at 1000°C "cooperite", "braggite", and a melt and ...
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(2000)Fe-Mg bearing chloritoids were synthesized at 18-35 kbar and 590-720 degrees C in a piston cylinder apparatus under the f(O2) defined by the Fe/FeO buffer (IW). We investigated the synthetic crystals by electron microprobe, ...
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(1996)Armalcolite and pseudobrookite have been crystallized from synthetic melts of basaltic composition with variable amounts of added TiO 2. It was found that the composition of the armalcolite and pseudobrookite are dependent ...
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(1999)Coeval silicate melt and aqueous synthetic fluid inclusions were formed at 800 degrees C and 2000 bars in the quartz-saturated haplo-granite-H2O-NaCl-KCl system. The equilibrium assemblage consisted of Ab(19.2)Or(31.1)Qtz(49.1) ...
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(2000)The nature and abundance of dislocations in quartz surrounding fluid inclusions were studied to obtain a better understanding of processes associated with fluid inclusion reequilibration. Synthetic fluid inclusions containing ...
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(1995)The location of the liquid + vapor -> liquid phase boundary and the P-T slopes of iso-Th lines were determined for a constant composition of 40 +/- 0.1 wt% NaCl and 5 +/- 0.15 mol% CO2 (both relative to H2O) at high density. ...
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(2000)The ternary system H2O-NaCl-CO2 is one of the most important fluid systems in geochemistry and petrology. However, there is little information on the phase equilibrium and PVT properties in this system at salinities above ...
Now showing items 14070-14089 of 39124