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Browsing Геология России by Title
Now showing items 7145-7164 of 39195
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(2002)The Nb/U and Th/U of the primitive mantle are 34 and 4.04 respectively, which compare with 9.7 and 3.96 for the continental crust. Extraction of continental crust from the mantle therefore has a profound influence on its ...
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(2001)Large permeability anisotropy due to anisotropic alignment of clay shape fabric may play an important role in focusing fluid flow along fault zones in clay rich rocks. The degree of permeability anisotropy depends on the ...
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(2002)Strong scattered arrivals are observed in the 800-1400-km offset range of the four Peaceful Nuclear Explosion (PNE) seismic sections along the 3500-km-long E-W-trending Russian profile Kraton. They give evidence of an ...
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(2006)Various scenarios of earthquakes and the associated tsunami wave generation are numerically simulated. It is shown that, depending on the chosen dynamic source parameters in the central seismic gap zone of the Kurile-Kamchatka ...
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IMPLICATIONS OF THE TEMPORAL DISTRIBUTION OF HIGH-MG MAGMAS FOR MANTLE PLUME VOLCANISM THROUGH TIME (2002)We compile a 3.7-b.yr.-long time series of ultramafic and mafic rocks including extrusives and shallow intrusives (dikes and sills). We infer that peaks in the time series represent mantle plume events. Rocks erupted from ...
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(2004)In basin modeling the thermodynamics of a multicomponent multiphase fluid flux are computationally too expensive when derived from a cubic equation of state and the Gibbs equality constraints. In this article we present ...
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(2002)Planetary geology provides information on processes on the surface and interiorl of terrestria planets, satellites, and asteroids in the solar system. Surface composition and mineralogy is one of clues to understand planetary ...
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(1995)An improved method of trapping of gases on charcoal is described. The novel construction of the ''cold finger'' and electronic controller ensure reduced operation time and power consumption and increased flexibility of the ...
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(2001)Traveltime tomography by inverting direct arrival times is the most common technique in crosshole radar surveying. In a standard crosshole experiment, the inversion is a mathematically nonunique process due to the limited ...
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(2004)The association of rare earth and other trace elements with Fe and Mn oxides was studied in Fe-Mn-nodules from a lateritic soil from Serra do Navio (Northern Brazil). Two improved methods of selective dissolution by ...
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(1993)Mineral modes have been determined for specimens of eight rock types from CuK? X-ray powder diffraction data using the Rietveld method. The samples include two granites, a granodiorite, adamellite, gabbro, basalt, trachyte, ...
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(2004)Radio occultation experiments have been simulated for the Arctic region on the basis of the regional atmospheric model HIRHAM4. Irregular structures in the atmosphere produce a violation of the quasi-sphericity in the radio ...
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(1996)A method has been developed to analyze both H- and O-isotope compositions of saline waters and fluid inclusion brines without significant interference of salts. It involves high-temperature distillation under vacuum and ...
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(2000)We present a simple new background modeling method particularly for the determination of trace concentrations of Pb, U and Th to date zircons chemically by electron microprobe. This method reduces the acquisition time ...
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(2003)Hydrologists have been struggling over the past decades to improve rainfall-runoff models. As a consequence, models proposed 20-30 years ago still keep evolving as progress is made in the understanding of catchment ...
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(2002)The luminescent properties of PbWO4: Gd3+ was studied. The luminescence of Gd3+ in PbWO4:Gd3+ was quenched. It is possible that the excitation states of Gd3+ locate in the conduction band of PbWO4 crystal. The luminescent ...
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(2004)We present a new method for data weighting in waveform inversion to improve the obtained seismological earth model. We define 'sensitivity' as an index to show the homogeneity of the waveform inversion data set. The ...
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(1996)The formation of clathrates in fluid inclusions during microthermometric measurements is typical for most natural fluid systems which include a mixture of H2O, gases, and electrolytes. A general model is proposed which ...
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(2003)Resolution is key to confidently identifying unique geologic features using ground-penetrating radar (GPR) data. Source wavelet ''ringing'' (related to bandwidth) in a GPR section limits resolution because of wavelet ...
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(2002)Typical isochron calculations involve using a least squares analysis of the data. If the scatter about a line through the data is perfectly Gaussian, then least squares provides an optimal handling of the data. However, ...
Now showing items 7145-7164 of 39195