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Now showing items 11851-11870 of 39069
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(2004)The formation mechanisms of tremolite in a time series of hydrothermal experiments at 850 °C and 6.1 kbar were studied using transmission electron microscopy (TEM), analytical TEM, and X- ray diffraction. The starting ...
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(2004)Oxidation of pyrite in aqueous solutions in contact with air (oxygen 20%) was studied at 25°C using short-term batch experiments. Fe2+ and SO42− were the only dissolved Fe and S species detected in these solutions. After ...
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(1996)Pyrite formation has been investigated at 70°C and pH 6-8 by aging precipitated, disordered mackinawite, Fe9S8, and greigite, Fe3S4, in solutions containing aqueous H2S, HS-, S2-x, S2O2-3, SO2-3, colloidal elemental sulfur, ...
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(1999)Trace element composition and morphology of pyrite were analyzed in the metosomatic rocks of the modern Baransky (Iturup I.) and Pauzhetka (South Kamchatka) high-temperature hydrothermal systems. Pyrite occurs as disseminated ...
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(2004)The rate of pyrite oxidation in moist air was determined by measuring, over time, the pressure difference between a sealed chamber containing pyrite plus oxygen and a control. The experiments carried out at 25°C, 96.7% ...
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(2003)The oxidation of pyrite to release ferrous iron and sulfate ions to solution involves the transfer of seven electrons from each sulfur atom in the mineral to an aqueous oxidant. Because only one or, at most, two electrons ...
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(IOP Publishing, 2016)Authigenic sulfide mineralization in hydrocarbon-saturated reservoirs distorts the electrical and density properties of rocks. The correlation between volumetric density, electro-conductive minerals and open porosity in ...
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(2004)Pyritization in late Pleistocene sediments of the Black Sea is driven by sulfide formed during anaerobic methane oxidation. A sulfidization front is formed by the opposing gradients of sulfide and dissolved iron. The ...
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(2000)Lahars are often produced as pyroclastic flows move over snow. This phenomenon involves a complicated interplay of mechanical and thermal processes that need to be separated to get at the fundamental physics. The thermal ...
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(2000)Erosion of snow by pyroclastic flows and surges presumably involves mechanical scour, but there may be thermally driven phenomena involved as well. To investigate this possibility, layers of hot (up to 400 °C), uniformly ...
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(1997)The 1956 and 1984-1986 eruptions of Bezymyannyi were accompanied by the formation of ground and ash cloud surges. The mega- and microscopic structural and textural features of the resulting deposits are described, as well ...
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(2002)The 8–10 May 1997 eruption of Bezymiannyvolcano began with extrusion of a crystallized plug fromthe vent in the upper part of the dome. Progressive gravi-tational collapses of the plug caused decompression ...
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(1999)Oxidation of Co(II)EDTA2- to Co(III)EDTA- by manganese and iron hydrous oxide minerals enhances the transport of 60Co in subsurface environments. Until now, reduction of the oxidant MnO2 has not been identified in hydrodynamic ...
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(2004)Chrome spinels are common accessory minerals in a wide range of ultramafic rocks (dunites, harzburgites, lherzolites, websterites, and wehrlites) from different geological settings and depth facies. Macrocrysts and microcrysts ...
Now showing items 11851-11870 of 39069