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Browsing ELibrary by Title
Now showing items 9660-9679 of 21934
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(2002)Combined structural, compositional and osmium-isotope data on selected Pt–Fe nuggets from economically important placer deposits closely linked to clinopyroxenite–dunite massifs of the Siberian Platform (Kondyor, Inagli, ...
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(2003)The endogenic activation of the Russian Platform governed by pulsating mantle processes of different degrees of intensity along the lateral direction were accompanied by block movements of the Earth's crust and magmatism.
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(2001)Self-diffusion coefficients of water molecules (H2O) in Na-montmorillonite gel were measured as a function of water fraction (54.8 to 100 wt%) and temperature (30.4 to 60.0 °C) using proton nuclear magnetic resonance (NMR). ...
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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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(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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(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 ...
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(2004)The crystal structure of triclinic pyrophyllite and its dehydroxylate derivative was studied with quantum mechanical calculations. The standard Kohn-Sham self-consistent density functional theory (DFT) was used through a ...
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(1983)TheP-T location of the reaction diopside + magnesiteaienstatite + dolomite has been determined by experimental reversals from 800 to 1300°C, 20–50 kbar. Up to ∼ 1150°C this reaction has a slope of ∼ 52 bar/deg, and above ...
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(1998)The composition of pyroxene phenocrysts was examined in the volcanics (ranging from basalt to rhyodacite) of the Uzon-Geizernaya volcano-tectonic depression. Variations in the contents of certain components and in their ...
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PYROXENITE XENOLITHS IN PICRITE BASALTS (VITIM PLATEAU): ORIGIN AND DIFFERENTIATION OF MANTLE MELTS (2002)The petrography and major- and trace-element chemistry of pyroxenite xenoliths from Miocene picrite basalts of the Vitim plateau suggest an origin by polybaric fractional crystallization of mantle melts. High-temperature ...
Now showing items 9660-9679 of 21934