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Browsing ELibrary by Title
Now showing items 9672-9691 of 21934
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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 ...
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(2004)The paramagnetic clay mineral illite can have important controls on fluid permeability and microporosity in sedimentary rocks. Increases in illite content of a few percent can reduce permeability by several orders of ...
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(2003)In this paper isotope ratio mass spectrometry is used to determine the methane (CH4) oxidation fraction in the rhizosphere of intact rice plant-soil systems. Earlier studies on quantification of the methane oxidation were ...
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(2003)A quantitative physical model is presented which includes the factors that control the presence, or absence, of internally derived excess 40Ar or excess 4He in geological systems. In particular, the model incorporates the ...
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(2006)The determination of total water content (H2OT: 0.1-10 wt%) and water speciation (H2Omolecular/OH) in volcanic products by confocal microRaman spectrometry are discussed for alkaline (phonolite) and calcalkaline (dacite ...
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(2003)This paper deals with the errors introduced in the construction of cross-sections due to the use of apparent dips and thicknesses when projecting data onto the plane of section. These errors are analyzed under the perspective ...
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(2002)Measurements of CO2 fluxes from ground surface of the atmosphere (soil respiration) are needed to quantify biotic and abiotic reaction rates in unsaturated zones and to gain insight into the importance of these processes ...
Now showing items 9672-9691 of 21934