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Browsing ELibrary by Title
Now showing items 3611-3630 of 21768
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(2001)A theoretical model is proposed for diamond formation in the crust of the Ukrainian Shield. The temperatures required for the formation of diamonds are sustained by overheated magmatic material of mantle diapirs (identified ...
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(2003)The two-phase theory for compaction and damage proposed by Bercovici et al. (2001a, J. Geophys. Res., 106, 8887-8906) employs a nonequilibrium relation between interfacial surface energy, pressure and viscous deformation, ...
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(2002)The thermochemistry of anhydrous sulfates (anglesite, anhydrite, arcanite, barite, celestine) was investigated by high-temperature oxide melt calorimetry and differential scanning calorimetry. Complete retention and uniform ...
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(1999)The enthalpy of formation of kaolin polymorphs at 298 K has been determined by dropsolution calorimetry into molten lead borate at 975 K. Corrections have been made for impurities in the samples. The standard enthalpy of ...
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(1997)Transposed temperature drop calorimetry at 977 K was used to study the energetics of natural manganese dioxides (pyrolusite and ramsdellite) and oxyhydroxides (manganite and groutite). The structures of these minerals are ...
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(2002)The energetics of multicomponent diffusion in molten CaO-Al2O3-SiO2 (CAS) were examined experimentally at 1440 to 1650°C and 0.5 to 2 GPa. Two melt compositions were investigated: a haplodacitic melt (25 wt.% CaO, 15% ...
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(2002)Global energy balances provide a useful framework for assessing the operation of numerical geodynamo models. We apply a spectral decomposition to the magnetic and kinetic energy equations to assess how the magnetic field ...
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(1998)The energetics of a set of synthetic iron oxides and oxyhydroxides were determined by transposed temperature drop calorimetry and high temperature solution calorimetry using sodium molybdate as a solvent at 979 K. The ...
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(2004)Enthalpies of dissolution in HF solutions have been measured at 323 K for a series of hydrous trachyte glasses. Enthalpies of mixing between water and molten trachyte have then been calculated from heat capacity data for ...
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(2001)We derive a general thermo-mechanical theory for particulate materials consisting of granules of arbitrary whose material points possess three translational and three independent rotational degrees of freedom. Additional ...
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(2003)This study employs the principles of energy conservation to establish the framework for the development of the dynamical equations of head cut as a part of a continuum mechanical analysis of soil erosion induced by surface ...
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(1990)Rock blasting often produces aftershock sequences whose duration, intensity and total energy depend not only on the size of the shot, but also on the seismotectonic activity of the region. The aftershock sequence represents ...
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(1989)Recently, attempts were made to develop a quantitative theory of the geological and geophysical medium i.e., in situ methods for determining the properties of rocks and of the processes taking place in them. Obtaining such ...
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ENHANCED CHEMICAL WEATHERING OF ROCKS DURING THE LAST GLACIAL MAXIMUM: A SINK FOR ATMOSPHERIC CO2? (1999)It has been proposed that increased rates of chemical weathering and the related drawdown of atmospheric CO2 on the continents may have at least partly contributed to the low CO2 concentrations during the last glacial ...
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(2002)The accurate geolocation of a laser altimeter's surface return, the spot from which the laser energy reflects on the Earth's surface, is a critical issue in the scientific application of these data. Pointing, ranging, ...
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(2003)Although direct microbial reduction of Cr(VI) and U(VI) is known, few studies have examined the kinetics and the underlying mechanisms of the reduction of these contaminants by different natural organic matter (NOM) fractions ...
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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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(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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(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, ...
Now showing items 3611-3630 of 21768