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Browsing ELibrary by Title
Now showing items 6056-6075 of 21253
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(1997)Celadonite, glauconite and Fe-illite samples were studied by XRD, EXAFS, IR and Mössbauer spectroscopy. The samples were monomineralic and corresponded to 1M polytype. In the OH-stretching region of the IR spectra the ...
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(2003)The geometrical features and electronic structure of molecular cluster models of two edge-sharing octahedrally coordinated cations, with and without a ring of six silica tetrahedra coupled to the two octahedra, were studied ...
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(2000)The geometrical features and electronic structure of molecular clusters models of two octahedrally coordinated cations in edge-sharing octahedra were studied by means of Hartree-Fock ab initio molecular orbital calculations ...
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(2003)By using a specially designed and constructed isopiestic apparatus, we measured the osmotic coefficients at 313.2 K for the NaOH-NaAl(OH)4-H2O system with the total alkali molality, mNaOHT (mNaOH + mNaAl[OH]4), from 0.05 ...
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(1992)
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(1996)The equivalent elastic thickness (EET) is used to estimate lithospheric strength expressed in response to loading by topography and subsurface loads. The data on EET allow comparisons between different plates and detection ...
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(1991)At present, there are two concepts of the term isostasy. According to the first one, isotasy means hydrostatic pressure conditions at the depth of compensation existing due to mass distributions above that depth. The second ...
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(2004)Decompression of deep, hot continental crust is the primary mechanism of crustal melting, with major consequences for the geodynamics of orogens. Decompression within thickened continental crust may be initiated by processes ...
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(2004)The high-pressure (HP) structural evolution of a natural tetragonal edingtonite from Ice River, Canada, was investigated up to 5.1 GPa using in situ single-crystal X-ray diffraction and a diamondanvil cell. The isothermal ...
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(2000)Carbon-isotope compositions of n-alkanes, pristane and phytane, and total organic carbon were measured and compared against isotopic trends of coeval alkadienones from Miocene sediments containing very low organic-carbon ...
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(1988)The authors studied ten peridotite inclusions from basalts of the central Vitim Plateau namely eight granite-containing and one spinel-containing 1herzolite from recently discovered alkalic picrite tuff, thought to be of ...
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(1989)Isotope data should help to clarify the problem of the origin of water participating in hydrothermal activity. Thus, isotope data suggest that water participating in calcalkalic magma generation is of crustal (oceanic) ...
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(1989)Hydrogen is a common impurity in diamonds, where its average concentration is 0.01 percent; but it may reach levels as high as 0.5 percent in carbonadoes and bort. Determining the isotopic composition of this hydrogen is ...
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(2003)Experimental diffusion couples were used to study chemical diffusion between molten rhyolite and basalt with special emphasis on the associated fractionation of calcium and lithium isotopes. Diffusion couples were made by ...
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(1999)Laboratory diffusion experiments specifically designed to resolve small differences in the relative mobility of isotopes were used to measure the mobility of 76Ge vs. 70Ge in molten GeO2 (1400°C, 0.5 GPa) and 48Ca vs. 40Ca ...
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(2001)Isotope fractionation during sulfate reduction was explored for natural populations of sulfate-reducing bacteria. High fractionations of 30%% to 40%% were produced when the natural population metabolized with indigenous ...
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(1991)This paper deals with a model of carbon isotope fractionation presumed to accompany the movement of mantle fluids. In the first part of the article, the experimental data and the relationships revealed are generalized and ...
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(2001)This study is based on the isotope-geochemical characteristics of oils from 53 fields in the South Caspian Basin - from Upper Cretaceous, Eocene, Oligocene-Lower Miocene (Maykop), middle and the Upper Miocene (Diatom) and ...
Now showing items 6056-6075 of 21253