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Browsing ELibrary by Title
Now showing items 4802-4821 of 26297
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(1996)Major- and trace-element concentrations and Nd-, Sr- and Pb-isotopic ratios are reported for the Dovyren layered mafic-ultramafic intrusion in the northern Baikal region, eastern Siberia. SmNd internal isochrons for an ...
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(2006)Mineralogy and geochemistry of nine Late Permian coal-seam channel samples (anthracite) from Xingren, Guizhou, Southwest China were examined. Results showed that As, Sb, Hg, and Tl are significantly enriched in a Late ...
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(2004)We studied 2 enstatite aggregates (En >99), with sizes of 0.5 and 1.5 mm, embedded in the carbonaceous matrix of Kaidun. They contain sulfide inclusions up to 650 μm in length, which consist mainly of niningerite but contain ...
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(2000)The compositions of aqueous fluids in equilibrium with enstatite + forsterite were investigated at temperatures from 900 to 1200°C and pressures from 1.0 to 2.0 GPa. Experiments, performed in a piston-cylinder apparatus, ...
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(2006)We used titration calorimetry to measure the bulk heats of proton and Cd adsorption onto a common Gram positive soil bacterium Bacillus subtilis at 25.0 °C. Using the 4-site non-electrostatic model of Fein et al. [Fein, ...
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(1988)In order to investigate the thermodynamic properties of alkali feldspars, three new feldspar ion-exchange series have been synthesized, two based on monoclinic parent materials having intermediate degrees of Al—Si order, ...
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ENTHALPIES IN (NA,CA)- AND (K,CA)-FELDSPAR BINARIES: A HIGH-TEMPERATURE SOLUTION CALORIMETRIC STUDY (2003)A series of high structural state plagioclases (Ab-An) was crystallized from glasses. By exchanging Na for K in KCl melts, metastable K-plagioclases (Or-An) were prepared which possess the same structural state as the ...
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(2001)Molar enthalpies of formation of natural, near end-member tremolite and talc have been calculated from high temperature lead borate drop-solution calorimetry. Using three mutually consistent reaction cycles for each phase, ...
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(2001)The monoclinic titanite-like high-pressure form of calcium disilicate has been synthesized and quenched to ambient conditions to form the triclinic low-pressure phase containing silicon in four-, five- and sixfold coordination. ...
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(1993)Differentiation in magma chambers, in the Earth's core and in the partially molten early Earth is a competitive process between sedimentation and re-entrainment of crystals in the presence of convection. Previous studies ...
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(2003)The large mismatch between Earth's heat flux and that which would be produced in a uniform mantle with the composition of the mid-ocean ridge basalt source region, and several recent seismic models, suggest that the bottom ...
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(2003)The entrance of hot pyroclastic flows into water has been observed in a series of experiments in which shooting granular flows of hot ignimbrite ash (≤403 °C), of bulk density near that of water, run down a smooth chute ...
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(2000)Observations of seismic waves from earthquakes at depths between 100 and 200 km beneath Japan show that the initial portion of the S-wave arrival has greater duration than can be accounted for by earthquake source-time ...
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(2002)High-frequency S wave seismogram envelopes are broadened with increasing travel distance due to diffraction and scattering. The basic mechanism of the broadening has been studied on the basis of the scattering theory with ...
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(2006)The relationship between potential elemental proxies (Mg/Ca, Sr/Ca and Mn/Ca ratios) and environmental factors was investigated for the bivalve Pecten maximus in a detailed field study undertaken in the Menai Strait, Wales, ...
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(2006)The Zlata Idka village is a typical mountainous settlement. As a consequence of more than 500 years of mining activity, its environment has been extensively affected by pollution from potentially toxic elements. This paper ...
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(2002)In addition to the stable isotope 9Be, Be is also formed as two cosmogenic isotopes of interest to earth scientists. Cosmogenic Be is formed primarily in the stratosphere from cosmic-ray spallation ...
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(2006)The purpose of this paper is to document the influence of depositional environments on shallow-water, low-relief clinoforms from the description of five ancient carbonate platforms: the Neoproterozoic (Namibia), Middle ...
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(2006)Vanadium is a trace element widely distributed in the Earth’s crust. Naturally high levels of vanadium are recognized mainly in basic rocks and minerals, particularly in titaniferous magnetite. And the anthropogenic sources ...
Now showing items 4802-4821 of 26297