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Browsing Геология России by Title
Now showing items 7585-7604 of 39126
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(2001)Mathematical representation of the dynamics of a highly viscous, rheologically heterogeneous, incompressible medium affected by gravity is considered. The solution is defined by reducing the original system of differential ...
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(2004)A simple analysis suggests that a time interval of more than about 5000 Myr is needed for the random palaeogeographic test to be effective in assessing the geomagnetic axial dipole assumption. This time is so long as to ...
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IS AMINO ACID CHRONOLOGY APPLICABLE TO THE ESTIMATION OF THE GEOLOGICAL AGE OF SILICEOUS SEDIMENTS? (2002)There are few conventional dating methods that can be used to estimate the geological age of siliceous sediments on the order of 104-105 yr. In contrast, methods such as δ18O are available for dating carbonate-containing ...
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(2000)We tested the hypothesis that, on the scale of a decade, earthquakes deeper than 60 km are produced at an approximately constant, that is, stationary Poissonian rate. We selected earthquakes with depths greater than 60 km ...
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(2003)Macroscopic transport properties of natural porous media, such as the permeability tensor K, are the sum of uncountable microscopic events. Understanding how these microscopic events come together to yield a descriptive ...
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(1995)Dense hydrous magnesium silicates (DHMS), such as phase A [Mg7Si2O8(OH)6], are potential hosts for water in the Earth's mantle. Previous work has delineated the stability field of phase A (PhA) coexisting with clinoenstatite ...
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(2000)Two techniques for resolving the conductance of an electrically conductive asthenosphere are presented. The first technique combines observatory electromagnetic data in the period range of the daily variation and longer, ...
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IS THE TRANSITION ZONE AN EMPTY WATER RESERVOIR? INFERENCES FROM NUMERICAL MODEL OF MANTLE DYNAMICS (2002)Water is probably present everywhere in the Earth’s mantle today, with abundances ranging between scales of percent (%) to the parts per million (ppm). Mantle total water content is estimated to be between 10% to several ...
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(1995)The equilibria controlling silica activity and oxygen fugacity (fO2) in the upper mantle are related and all sensitive to pressure. With increasing pressure, both silica activity andfO2 will fall. Provided there is no ...
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(1998)In 1983, Lay and Helmberger [Geophys. J. R. Astron. Soc. 75 (1983) 799-837] reported the detection of a precursor to the seismic phase ScS. They attributed this precursor to a sharp seismic discontinuity located several ...
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(1995)A number of solubility studies of aluminous minerals in aqueous alkali hydroxide solutions at high pressures have been interpreted by proposing the existence of alkali-Al complexes under these conditions. This paper shows ...
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(2001)A number of researchers have reported experimental data on the Sm-Nd isotopic system of garnet and clinopyroxene from xenoliths in the kimbcrlite pipes of southern Africa and Yakutia. In the majority of cases, they do not ...
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(1999)Simulations of crystal growth in hydrous albite-quartz and albite-orthoclase systems were performed with the Jackson, Gilmer, and Temkin formulation of the Ising model. These simulations demonstrate that at 873 K (approximately ...
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(2000)In order to constrain the LIL-element distribution for subduction zone environments, exchange coefficients (KD) for K, Rb and Cs between aqueous fluids and phengite have been determined experimentally at 2.0 and 4.0 GPa. ...
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(1996)Fluid inclusions in minerals often follow isochoric-isoplethic paths through P-T space, both in nature and during microthermometry. The systematics which arise from this behaviour are the basis for interpreting fluid ...
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(2004)The use of a bentonite buffer as an engineered barrier is specified in many contemporary designs of deep-seated underground repositories for high-level radioactive wastes (HLW). Briquettes of compacted bentonite are placed ...
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(PANGAEA, 1999-12-22)The marine-lacustrine transition (isolation contact) in sediment cores from eight lake basins situated 13.5–72 m a.s.l., in the Norwegian-Russian border area north of Nikel, northwest Russia, was identified based on ...
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(1995)This study explores the geochronological utility and analytical reproducibility of separating the high-molecular-weight fraction (HMW) from eggshells of the extinct late Pleistocene ratite, Genyornis, using disposable, ...
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(1997)Isolueshite, ideally (Na, La, Ca) (Nb, Ti)O3, was found in a hydrothermally altered pegmatite vein in ijolite-urtite of the Khibina alkaline complex, Kola Peninsula, Russia. The host rock consists of microcline, sodalite, ...
Now showing items 7585-7604 of 39126