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Browsing Геология России by Title
Now showing items 16419-16438 of 39124
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(2002)The crystal structures and chemical compositions of two crystals of clinopyroxene (labelled K1 and K2) synthesized in the model system CaMgSi 2 O 6 -KAlSi 2 O 6 at 7 GPa, have been investigated. Quantitative analysis leads ...
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(2003)More and more evidence is being discovered in Phanerozoic collision belts of the burial of crustal rocks to previously unsuspected (and ever increasing) depths, presently on the order of 150–200 km, and of exhumation from ...
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ULTRAMAFIC ALKALINE VOLCANIC ROCKS OF THE ZHLOBIN FIELD (BELARUS): SOURCES AND EVOLUTION OF MAGMAS (2004)The variations in the isotopic and trace-element compositions of ultramafic alkaline volcanic rocks from the Zhlobin fields were investigated. Variations of isotopic and trace-element compositions of volcanic rocks were ...
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(2004)Like other massifs of the Platinum Belt in the Urals, the Kachkanar massif is composed of ultramafic rocks and younger gabbroids. The older association of dunite with olivine and magnetite clinopyroxenites is related to ...
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(1990)The lithology of the sediments (siliceous, clayey-siliceous, graywacke, and tuffogenic deposits) of the lower Drozdovskaya Formation suggests that the lavas were erupted in a deep-sea basin (tholeiite) and on its flanks ...
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(2003)We report data on the composition and crystal structure of the most K-rich (3.61 wt% K2O) natural clinopyroxene yet discovered. The studied crystal was found as a tiny inclusion in garnet from a garnet-clinopyroxene rock ...
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(2003)The diamond-bearing, ultrahigh-pressure Kokchetav Massif recrystallized at eclogite-facies conditions deep in the mantle at 180-km depth at 535 F 3 Ma, and yet new 40 Ar/ 39 Ar ages suggest that it may have been exhumed ...
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(2001)Measurements of compressional wave attenuation are presented for 30 low-porosity (φ = 0.4-8.8 per cent) oceanic basalts collected from 10 oceanic drill holes. The first laboratory measurements of shear wave attenuation in ...
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(2002)Marbles are frequently used as building stones even if they mostly show a limited durability. Thus, different marbles with different fabric types and states of preservation have been investigated in order to constrain the ...
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UNCERTAINTIES IN FACIES PROPORTION ESTIMATION I. THEORETICAL FRAMEWORK: THE DIRICHLET DISTRIBUTION (2002)To simulate geological models comprising several litho-types-or facies-we need first to estimate their proportions, which are often poorly known. The corresponding uncertainties can be modelled using a Bayesian approach ...
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(2002)Geostatistical simulations of lithotypes or facies are commonly used to create a geological model and to describe the heterogeneities of petroleum reservoirs. However, it is difficult to handle such models in the framework ...
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(2003)The matrix inversion of seismic data for slip distribution on finite faults is based on the formulation of the representation theorem as a linear inverse problem. The way the problem is posed and parameterized involves ...
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(1998)A weighted least-squares method is used to generate the `true' lead isotopic composition from measurements on unspiked and spiked aliquots of a sample using the double-spike method. A form for the weighting based on ...
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(2001)Soil erodibility accounts for the influence of the intrinsic soil properties on soil erosion and is one of six factors in the Revised Universal Soil Loss Equation (RUSLE), a most widely used model to predict long-term ...
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(2003)The interrelation between conductive and convective (hydrothermal) components of heat release was not taken into account in the previous interpretations of the thermal anomaly in the Baikal rift zone (BRZ). In this ...
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(2001)The Sakha Republic (Yakutia) is the northern frontier territory of Russia, located partly above the Arctic Circle. It holds important natural mining resources for the country's current and future economic development. A ...
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(2001)Mining of kimberlite diamond-containing ores in Yakutia has been considered. Deposits of kimberlite ores are under permafrost overburden which is very thick. Opencast mining of the ores is economically non-advisable. In ...
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(PANGAEA, 2018-05-08)In geophysical exploration and geomagnetic monitoring, the self-potential method examines slowly varying electric potentials measured across horizontally extended electrodes. Subsequently, electric methods were applied in ...
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UNDERPLATING AS A CAUSE OF THE VOLCANIC CONTINENTAL MARGIN FORMATION DURING MARGINAL SEA SPREADING (2004)Problems related to the rifting zones and continental margins of the opening sea basins include the necessity of explaining the alternation of active magmatic and a magmatic segments of continental margins recognized as ...
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(2000)Natural impacts in which the projectile strikes the target vertically are virtually nonexistent. Nevertheless, our inherent drive to simplify nature often causes us to suppose most impacts are nearly vertical. Recent ...
Now showing items 16419-16438 of 39124