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Browsing ELibrary by Title
Now showing items 10422-10441 of 21253
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(2003)We have evaluated the highly siderophile element (HSE) signatures of the martian (SNC) meteorites using new and literature data. These Ir and Os concentrations correlate with the Mg# [molar Mg/(Mg+Fe)], Cr and Ni, suggesting ...
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(2002)The detailed taxonomy of Czekanowskiales and genus Coniopteris dominating in Jurassic paleoflora of West Siberia, composition and stratigraphic confinement of their assemblages, and species of a restricted stratigraphic ...
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(2002)Corganic/Ntotal values change from ~5 in middle Miocene sediments deposited under the Benguela Current upwelling system to ~15 in latest Miocene and Pliocene sediments. Although the change appears to record a larger ...
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(1988)We investigated liparite domes that include Pliocene obsidians and perlites in the Kel'badzhar region of Azerbaidzhan. Elements of perlitic texture are identifiable in pumice and obsidian, as a result of which they too may ...
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(2002)The South Caspian basin has been a major petroleum-producing province for more than a century. While the basin's oil has been the focus of a number of studies the region's gas has been largely understudied. This study ...
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(2000)Taxonomic composition of six stratigraphically important Riphean microbiotas from the southern Urals (Bashkirian meganticlinorium) and adjacent region (the Verkhnyaya Kama depression of the Kama-Belaya aulacogen) is ...
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(1995)A mantle value of # 17.5 for NbTa appears well established; less well established are crustal values of # 11-12, although it appears that NbTa for crustal-derived melts is less than mantle NbTa, demonstrating fractionation ...
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(2001)Potential mineralization of volcanic structures is determined by geochemical potential of composing rhyolites, i.e. by original silver (and gold) content in unaltered rocks. It is realized due to metasomatic transformations ...
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(1992)An examination was made of the geological, textural-structural, mineralogical and geochemical signs indicating that the dunites forming the Konder massif were in the solid phase during their intrusion into the upper layers ...
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(1998)Mantle peridotite xenoliths from Archean cratons generally have high molar Mg/(Mg + Fe), or Mg#. The best known suites, from the Kapvaal and Siberian cratons, have high modal orthopyroxene (Opx). These high Opx compositions ...
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(2002)In-situ Raman measurements of silica speciation in aqueous fluids in equilibrium with solid quartz are reported to 14 kbar and 900 °C. Silica speciation in the fluid depends strongly on temperature and pressure. The Raman ...
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SILICA TRANSPORT AND GROWTH OF HIGH-TEMPERATURE CRYSTALLINE QUARTZ IN SUPERCRITICAL AQUEOUS FLUIDS (1999)Silica transport and seed growth of high-temperature quartz in pure water and various aqueous fluids (pH from 1 to 12) were experimentally studied at temperatures from 580 to 1100°C and pressures from 0.2 to 5 kbar under ...
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(2004)Silicate melt inclusions are ubiquitous in phenocrysts in porphyry copper deposits. Compared to melt inclusions in other igneous environments, those in porphyry copper deposits are more difficult to recognize and analyze, ...
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(1995)The decrease of the specific volume, when the extent of polymerization diminishes, is a cause of the pressure sensitivity of the viscosity of silicate melts. This effect can be explained by means of the Adam and Gibbs ...
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(2001)Silicate-melt inclusions in igneous rocks provide important information on the composition and evolution of magmatic systems. Such inclusions represent accidentally trapped silicate melt (±immiscible H2O and/or CO2 fluids) ...
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(2001)An investigation of the structure of sodium aluminum silicate glasses [composition (x)Na2O, (1-x)Al2O3, 0.9SiO2 perturbed through the addition of 2 mol.% P2O5] was performed using a combination of 27Al, 29Si, and 31P solid ...
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(2001)Structural data for glasses along the join 0.1[xNa2O-(1-x)Al2O3]-0.9SiO2 + 2 mol.% P2O5, obtained from multinuclear NMR and ab initio shielding calculations, have been combined with Raman spectroscopic data on the glasses ...
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(2000)Two models of silicic magma formation have been experimentally tested: (1) generation of A-type granite magma by partial melting of crustal source rocks at depths >50 km; (2) production of syenite magma by partial melting ...
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(2002)Microbiota from cherts of the Vendian Yudoma Group, the terminal one in succession of Precambrian deposits of the Uchur-Maya region, southeastern Siberia, is described and analyzed. Dominant in the Yudoma microbiota are ...
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(1997)Recently obtained silicon self-diffusion data, DSi = D0exp(- ΔH/RT), in silicates (quartz, vitreous silica, forsterite, San Carlos olivine and diopside) show a compensation law that is a linear relation, log D0 = log D* + ...
Now showing items 10422-10441 of 21253