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Browsing ELibrary by Title
Now showing items 10561-10580 of 21879
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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* + ...
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(2005)The silicon isotope abundance ratios and atomic weights of NBS-28 and several other silicon isotope reference materials were determined in this study. For the calibration of the measurement procedure, two new synthetic ...
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(2003)The silicon isotope composition (30Si) of biogenic opal provides a view of the silica cycle at times in the past. Reconstructions require the knowledge of silicon isotope fractionation during opal biomineralization. The ...
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(2003)Silicon diffusion was measured in natural quartz and anorthitic feldspar under dry, low-pressure (0.1 MPa) conditions using a 30Si tracer. Sources of diffusant consisted of 30Si-enriched silica powder for experiments on ...
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(2001)The sculpture of scales and plates of articulated anaspids from the order Birkeniida is described and used to clarify the position of scale taxa previously left in open nomenclature. The dermal skeleton of a well-preserved ...
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(1989)Among volcanic rock associations, the indicators of geodynamic environments, special attention has recently been paid to the boninite association: a series of high-magnesian, low alumina rocks, whose mafic members are close ...
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(2002)The concept of time-dependent eustatic fluctuations has been largely recognized, and a number of eustatic events with magnitudes from 20 to 100 m and durations 1 to 3 m. y. (third-order cycles) have been suggested for the ...
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(2001)A concise characterization of the lithology and stratigraphy of the Eastern Mongolian localities of Silurian Heliolitoidea and the faunal list of Reliolitoids from the Salhitin, Baruun Urt, and Süchbaatar Beds (Upper ...
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(2003)It is widely accepted that major variations of sea-level have occurred in the Phanerozoic. Third-order cycles, 1–10 Ma long with amplitudes of 20–100 m, are of special interest for geochronology and petroleum geology. The ...
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(1998)Principles of stratigraphic regionalizing and chronozonal characteristics of global and regional stratigraphic scale for East Siberia are presented. The stratigraphic regionalizing resulted in recognition of five subregions ...
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(1988)By studing multiphase inclusions in early quartz from pipe-like ore bodies of the Kochbulak deposit, the authors have obtained the first information on tellurium concentration in high-temperature ore-forming solutions, as ...
Now showing items 10561-10580 of 21879