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Browsing ELibrary by Title
Now showing items 9605-9624 of 21821
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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 ...
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(2002)Experimental results of a study of electromagnetic fields due to detonation of high explosive charges with mass of a few kilograms are presented in this paper. Data show that in the initial stage of explosion the fields ...
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(2003)The mineral, triclinic astrophyllite, was investigated using the Mossbauer effect. The Mossbauer spectra of triclinic astrophyllite at 298 K, 180 K and 90 K were measured, and the quadrupole splitting distributions (QSDs) ...
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(2001)Traditional ichnofabric-descriptive (semiquantitative:l schemes rely upon subjective estimates of the degree to which original sedimentary fabrics have been disrupted. This paper presents an objective method of quantifying ...
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(2001)The total organic carbon (TOC) of many recultivated mine soils is composed of a fraction that is lignite-derived as well as a fraction that is derived from recent plant litter. In these soils, precise quantification of the ...
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(2006)Diagenesis of bone during fossilization is pervasive, however, the extent of this process varies with depositional environment. This study quantifies diagenesis of shark vertebral centra through analysis of a suite of ...
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(2002)Determination of Fe3+/ΣFe in minerals at submicrometre scale has been a long-standing objective in analytical mineralogy. Detailed analysis of energy-loss near-edge structures (ELNES) of the Fe L23 core-loss edges recorded ...
Now showing items 9605-9624 of 21821