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Browsing Геология России by Title
Now showing items 3215-3234 of 39126
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CONVERTED-WAVE MOVEOUT AND CONVERSION-POINT EQUATIONS IN LAYERED VTI MEDIA: THEORY AND APPLICATIONS (2003)We have developed improved equations for calculating the conversion point of the P-SV converted wave (C-wave) in transversely isotropic media with a vertical symmetry axis (vertical transverse isotropy (VTI)). We have also ...
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(2000)The cooling behaviour of partial thermoremanences (pTRMs) below the acquisition temperature (T2) is reported for the first time for well defined, sized, synthetic multidomain magnetite samples produced by hydrothermal ...
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(2006)We have determined cooling rates of orthopyroxene crystals from two Mg-suite lunar samples (gabbronorite 76255 and troctolite 76535) and one terrestrial sample (orthopyroxenite SC-936 from the Stillwater Complex), on the ...
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(2000)Glass fragments from three different hyaloclastites have been used to evaluate the range of cooling rates experienced by undersea volcanic deposits. We found that the glass fragments retain structures with a range of ...
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(1996)The coordination environment of Ti(IV) in a variety of Ti-bearing crystalline oxide and silicate model compounds has been studied using Ti K-edge x-ray absorption fine structure (XAFS) spectroscopy at ambient temperature ...
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(1996)The coordination environment of Ti(IV) in a number of Ti-silicate and Ti-aluminosilicate glasses has been determined by x-ray absorption fine structure (XAFS) spectroscopy at the Ti K-edge at ambient temperature and pressure. ...
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(1996)The local structural environment of Ti in five Na-, K-, and Ca-titanosilicate glass/melts with TiO2 concentrations ranging from 2.7-30.5 wt% has been determined by in situ Ti K-edge x-ray absorption fine structure (XAFS) ...
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(1997)The coordination environment of Ti(IV) in seven natural and synthetic glasses of basaltic, trachytic, rhyolitic composition as well as four tektites has been studied using high-resolution Ti K-edge x-ray absorption near ...
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(1998)Attenuated total reflectance FTIR spectroscopy was used to characterize Al(III)-acetate complexation at 25°C, in homogeneous aqueous solution and at the water-aluminum hydroxide interface. The data collected in aqueous ...
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(1989)The behavior of copper in magmatic and postmagmatic processes, like that of other ore elements of variable valence, is controlled in many respects by its form, which, in turn, depends to a considerable extent on the redox ...
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(2006)The effect of sulfur on the partitioning of Cu in a melt-vapor-brine ? magnetite ? pyrrhotite assemblage has been quantified at 800 °C, 140 MPa, fO2 = nickel-nickel oxide (NNO), log fS2 = - 3.0 (i.e., on the magnetite-pyrrhotite ...
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(2002)The solubility of copper in a sulfur-saturated basaltic melt has been determined at 1245°C as a function of fO2 and fS2. Copper solubilities at log fO2 values between -8 and -11 fall into two distinct populations as a ...
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(2004)We measured the adsorption of Cu(II) onto goethite (α-FeOOH), hematite (α-Fe2O3) and lepidocrocite (γ-FeOOH) from pH 2–7. EXAFS spectra show that Cu(II) adsorbs as (CuO4Hn)n−6 and binuclear (Cu2O6Hn)n−8 complexes. These ...
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(1999)Catalytic properties of Cu-doped alumina-pillared montmorillonite samples have been tested in the liquid phase oxidation of toluene, o-, m-, and p-xylene with hydrogen peroxide. The results show that the clay samples possess ...
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(2004)This study attempts to provide a theoretical evaluation of coprecipitation and fundamental data of binary mixing properties in the barite isostructural family. Mixing properties of binary solid solutions in the barite ...
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(2004)Coprecipitation of barite with trace constituents was simulated with consideration of aqueous speciation and complexation, mixing properties for the binary solid solutions (Zhu, this issue), precipitation and dissolution ...
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(1996)Acanthite (Ag2S), calcite (CaCO3), covellite (CuS), galena (PbS), and sphalerite (ZnS) have been crystallized via the diffusion of H2S or CO2 through polyethylene into metal chloride, metal sulfate or metal nitrate solutions. ...
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(2001)X-ray absorption and luminescence spectroscopies have been used to characterize the local structure and coordination of uranium(VI) species coprecipitated with calcite (CaCO3) from room-temperature aqueous solutions. ...
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(1996)Cordierite can contain variable amounts of H2O and CO2, and the total amount and relative proportions of these volatiles reflect the environment in which the cordierite was formed. In this study, cordierite has been ...
Now showing items 3215-3234 of 39126