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Browsing Геология России by Title
Now showing items 2735-2754 of 39195
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(2000)Paired D/H and 18O/16O analyses of natural goethites range from -224%% to -93%% for δD and from -15.5%% to +2.8%% for δ18O. The isotopic systematics of these goethites seem to be most closely mimicked by the goethite-water ...
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(PANGAEA, 2014-08-15)In general, a moderate drying trend is observed in mid-latitude arid Central Asia since the Mid-Holocene, attributed to the progressively weakening influence of the mid-latitude Westerlies on regional climate. However, as ...
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(1999)One can determine geomagnetic paleointensities from natural remanent magnetizations (NRM) and by inverting production rates of cosmogenic isotopes such as 10Be and 14C. Recently, two independently derived 200-kyr stacks ...
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(2004)The approach commonly used to assess the potential for climate reconstruction is to use linear regressions to compare the isotopic signal stored in archives to instrumental climatic data sets. A new method is proposed that ...
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(1988)To reconstruct the evolution of the climate, the authors mapped its zoning on the basis of planktonic forminifera characteristic of the end of the middle and the end of the late Miocene. The position of climatic zones in ...
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(2000)The Moskowian glacial horizon of the middle Pleistocene is distinguished in the center of the Russian Plain, and, despite a large distribution area, it is poorly studied lacking, for example, the universally adopted regional ...
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(1989)Processes of hydrocarbon accumulation in oil and gas basins are controlled by various geologic bodies, including the so-called clinoforms, which certainly affect these processes. It is very important to determine the origin ...
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(2005)Re-examination of holotype “clinoholmquistite”, ideally A□BLi2 C(Mg3Al2) TSi8 O22 X(OH)2 (Ginzburg 1965) from the Tastyg spodumene deposit, Tuva, Siberia, Russia by EMP and SIMS analysis and structure refinement shows that ...
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(1990)While examining rock fragments from the Kollektivnaya kimberlite pipe, the authors noticed a small kimberlite lump and, on its edge, observed an intergrowth of two minerals, brownish-red and green. Subsequent microprobe ...
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(1999)One of the most active issues in igneous petrology is the investigation of mantle melting, and subsequent differentiation. To evaluate alternative hypotheses for melting and differentiation it is essential to accurately ...
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(1999)The crystal structures of 212 experimentally synthesized, igneous clinopyroxenes were modeled from electronprobe chemical data. The coexisting melts span a wide range of petrologically relevant, dry and hydrous compositions, ...
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(2004)Clinopyroxene phenocrysts in the Kokchetav trachybasalts are variable in composition and textures. Two distinctive cores are recognized: diopside cores and green salite cores. The diopside cores with Mg# of 80-90 are mantled ...
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(2004)The picroilmenite-rich (up to 60 vol % ilmenite) kimberlite found in the Udachnaya-Vostochnaya Pipe is a unique case. A zone enriched in large picroilmenite and olivine phenocrysts (from 3-5 to 20 mm or more) was found in ...
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(2001)Clockwise pressure-temperature (P-T) paths of metamorphism pass through two kinds of melting reactions with increasing temperature. The first generates H2O-saturated partial melts at the H2O-saturated solidus, only if ...
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(2001)This paper describes a GPR study carried out with the aim of evaluating deterioration of concrete floors in a textile factory. In the past, production process waste was spilt onto the floor of the factory. A slow but ...
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(1995)Algaenans, i.e., highly aliphatic, nonhydrolysable, insoluble macromolecular constituents, have been identified in a number of microalga cell walls and their selective preservation shown to play a major role in the formation ...
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(PANGAEA, 2013-05-29)
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(2003)Simulations performed with the LLN two-dimensional Northern Hemisphere climate model have confirmed that climate is largely triggered by changes in insolation forcing although atmospheric CO2 concentration also plays an ...
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(2001)Ion microprobe quantitative imaging was performed for H, D, 12,13C, 16,18O, 27Al, and 28,29,30Si in five stratospheric particles with a 1.5 x 1.5 μm spatial resolution to determine the carriers of high D/H ratios and to ...
Now showing items 2735-2754 of 39195