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Browsing ELibrary by Title
Now showing items 5115-5134 of 21768
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(1998)The solubility of gold was measured in aqueous KCl (0.5 m) solutions under oxygen, sulfur, and slightly acidic pH buffered conditions between 350 and 450°C at a constant pressure of 500 bars. Two buffer assemblages were ...
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(2003)Many gold and polymettalic deposits are disposed within epidote propylites forming external zones of alteration. Preliminary experimental study of epidote stability in chloride solutions defined neutralization of both acid ...
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(2001)Gold solubility was studied by the ampoule-autoclave method in relation to the NaCl concentration in fluid on isopleths of 0, 1, 3, 5m at oxygen and sulfur fugacities buffered by HMP and PPM mineral mixtures. Gold ...
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(1999)A method is proposed for determining gold solubility in the common gold-bearing minerals (sulfides, etc.) using so-called 'gold-assisting elements' (GAE). These elements increase gold solubility in the fluid phase, enabling ...
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(2002)A vapor-undersaturated synthetic brine was equilibrated with metallic gold and a haplogranitic melt at 800°C and 100 MPa to examine the solubility, speciation and partitioning of gold in the silicate melt-brine-metallic ...
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(1990)Solubility measurements of Au in dilute to concentrated aqueous NaOH solutions at 25°C have been carried out. The data were fitted to the general half reaction Au ( c ) + 2 H 2 O AuO 2 H 4- n 1- n + nH + + e - in order to ...
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(2004)The solubility of gold has been measured in aqueous sulphide solutions from 100 to 500°C at 500 bar in order to determine the stability and stoichiometry of sulphide complexes of gold(I) in hydrothermal solutions. The ...
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(2003)The purpose of this investigation is to study the relationship of Au, Pt, and Pd distribution in ores of the deposit with contents of coaly substance (CS) and sulfide minerals. This problem is urgent, because no ...
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(2002)Possible reasons of a difference in modes of invisible gold occurrences in arsenopyrite at the Olympiada and Veduga deposits that are closely spatially situated and occur in a similar geological setting were considered. ...
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(2002)As part of the "Drosophila of igneous petrology" (Barker 1983), alkaline rocks have gained much attention among petrologists worldwide, mainly due to their distinct geochemistry, and many geoscientists still consider them ...
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(2002)A new genus and species of the family Trirachodontidae, Neotrirachodon expectatus gen. et sp. nov., is described on the basis of the lower jaw previously referred to as the gomphodont cynodont Antecosuchus ochevi. The new ...
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GONDWANA ALIVE CORRIDORS: EXTENDING GONDWANA RESEARCH TO INCORPORATE STEMMING THE SIXTH EXTINCTION (2003)In this volume in honour of John Rogers we propose a new way of looking at Gondwana and we urge our colleagues everywhere to join us in this venture. The Gondwana Alive Corridors provide a way of celebrating the unique ...
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(1999)Gonnardite is a fibrous zeolite. Its chemical variability and the frequent close association with thomsonite and other zeolites have made the chemical and crystal structural definition of the mineral difficult. Only recently ...
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(1999)Gorelovsky volcanic center is localized in the area of a high negative gravity anomaly. Its volcanic history included the growth of a pre-caldera dacite-andesite cone, the formation of a large caldera as a result of the ...
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(2001)Topographic data sets are often composed of terrain samples arranged in irregular meshes. Many gradient estimation methods require the data to be arranged in a regular mesh; irregular meshes present a difficulty for them. ...
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(2005)Kaolinite was intercalated with n-hexylamine, n-octadecylamine and n-docosanamine, using methanol-kaolinite as the precursor. The intercalation compound with n-docosanamine presented the largest basal spacing for a kaolinite ...
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(2001)Diffusion-controlled growth rates of polycrystalline enstatite reaction rims between forsterite and quartz were determined at 1,000 °C and 1 GPa in presence of traces of water. Iron-free, pure synthetic forsterite with ...
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(2001)An absolute value for the interfacial free energy of high-angle grain boundaries in olivine/fo90s been derived from a microstructurally equilibrated coarse-grained natural peridotite. The three-dimensional configuration ...
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(2002)To learn more about the kinetics and mechanisms of coarsening and melt inclusion formation, we investigated the effects of melt content, viscosity, and topology on the microstructural evolution of partially molten and ...
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(1988)Evolution of grain size in synthetic marbles was traced from compaction of unconsolidated powder, through primary recrystallization and normal grain growth, to a size stabilized by second phases. To form the marbles, reagent ...
Now showing items 5115-5134 of 21768