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Browsing ELibrary by Title
Now showing items 11998-12017 of 21934
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(2000)At the present time the tectonosphere, as the region of tectonic movements, is restricted by the upper mantle, that is, by the depth of 670 km. The deeper geospheres are supposed to be tectonically inert. It is proved in ...
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THE EARTHS MISSING XENON: A COMBINATION OF EARLY DEGASSING AND OF RARE GAS LOSS FROM THE ATMOSPHERE (1994)The under-abundance of Xe in the Earth's atmosphere relative to solar system abundances has been long recognised and is usually referred to as the “missing xenon problem”. It is suggested here that this feature of the ...
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(2001)According to conventional ideas, numerous eustatic sea-level changes occurred during the Phanerozoic with amplitudes 20–100 m and periods T=1–3 Myr (third-order cycles). At the same time, it is widely recognized that ...
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(2002)The Marun–Keu complex (Polar Urals, Russia) is a poorly known member of a group of high P complexes outcropping along the length of the Uralide orogen. The central and southern parts of the complex are metamorphosed at ...
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(2002)Analytic solutions are provided for the displacement and stress fields induced by an edge dislocation in a layered medium composed of two welded half-spaces endowed with different elastic parameters. A plane strain ...
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(2005)The Ediacara biota (575–542 Ma) marks the first appearance of large, architecturally complex organisms in Earth history. Present evidence suggests that the Ediacara biota included a mixture of stem-and crown-group radial ...
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(2006)The influence of Al(OH)4- on the dissolution rate of quartz at pH 10-13 and 59-89 °C was determined using batch experiments. Al(OH)4- at concentrations below gibbsite solubility depressed the dissolution rate by as much ...
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THE EFFECT OF AL2O3 ON FE-MG PARTITIONING BETWEEN MAGNESIOWUSTITE AND MAGNESIUM SILICATE PEROVSKITE (2002)We have measured the partitioning of Fe2+, Fe3+ and Mg2+ between magnesiowustite and magnesium silicate perovskite in both Al2O3-bearing and Al2O3-free systems. Starting compositions with varying Fe/(Fe+Mg) molar ratios ...
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(2001)The solubility of water in melts of alkali feldspar endmember compositions (MAlSi3O8, M=Li, Na, K, Rb) was investigated at temperatures 825–1420°C and pressures 50–800 MPa. Water contents of isobarically quenched glasses ...
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(1998)A large body of experimental evidence shows that at low and moderate pressure (<1.5 GPa), alkali-rich silicate liquids coexisting with Mg-rich olivine and orthopyroxene are richer in silica than typical basalts. This ...
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(2001)The effect of anhydrous composition on the solubility of water in granitic melts was investigated experimentally at 800 °C and pressures from 50 to 500 MPa. Starting materials were ten natural obsidians from various ...
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(1995)The effect of metal-malonate complexation on the decarboxylation rate of malonate was studied by comparing the decarboxylation rates observed for malonate-bearing solutions with and without aqueous metal at 55, 80, and ...
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(2004)Numerous researchers have obtained estimates of slip-weakening distance, Dc, and fracture energy for recent earthquakes. Dc, is often observed to be a significant fraction of the total slip and tends to correlate with total ...
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(2000)In situ atomic force microscopy (AFM) experiments have provided information about the effect of Ba2+ on crystal growth of calcite {1014} surfaces. The microtopographic features observed have been interpreted by considering ...
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(1991)The stability of pargasitic amphibole in the upper mantle is a function of water content and bulk rock composition, and under water-undersaturated conditions, the stability of amphibole controls the solidus position. ...
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(2003)The effects of Cd on the adsorption of an aquatic fulvic acid (FA) to the surface of Bacillus subtilis were investigated from pH 2.5 to 7.0, at fixed ionic strength (0.1 M NaClO4) and at ambient temperature (~22 °C). Cd ...
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(2006)Recent studies of uranium(VI) geochemistry have focused on the potentially important role of the aqueous species, CaUO2 (CO3)32- and Ca2 UO2(CO3)30(aq), on inhibition of microbial reduction and uranium(VI) aqueous speciation ...
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(2001)In this paper we develop a simple theoretical model to explain two of the most important observations about trace element partitioning. The first of these is the apparent dependence of crystal-melt partition coefficients ...
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(2002)The effect of standard processing techniques on the δ13C value of plant tissue was tested using species representing the three photosynthetic pathways, including angiosperms and gymnosperms within the C3 taxonomic division. ...
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(2003)Biotite is one of the most common minerals dated by the 40Ar-39Ar method. It frequently shows K contents below the expected stoichiometric value, suggesting the presence of low-K impurities. The most common low-K alteration ...
Now showing items 11998-12017 of 21934