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Browsing Геология России by Title
Now showing items 5260-5279 of 39124
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(1999)Organic matter loading in continental margin sediments frequently occurs at a concentration equivalent to a monolayer coating of mineral grains, raising the question of whether adsorbed organic matter is indeed dispersed ...
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(2002)One aspect of the inherent disorder in silicate glasses and melts is the intermixing among framework units, which has important implications to the macroscopic properties of silicate magmas. We present experimental evidence ...
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(2003)We have found clear evidence of live 10Be in five normal Type A Calcium-aluminum-rich inclusions (CAIs), one normal Type B CAI, and one FUN Type A CAI, all from CV3 chondrites. The (10Be/9Be)0 ratios range from ∼0.36 × ...
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(2003)The geological history of the families Platanaceae and Hamamelidaceae is studied on the basis of original fossil material and available literature. The evolutionary stages of morphological and taxonomic diversity are ...
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(2003)We present estimates of ''realizable'' influx of selected cosmogenic isotopes, 3He, 10Be, 26Al, and 14C, and platinum group elements, Ir, Os, and Re on the earth via influx of meteoroids. We define realizable as the ...
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(1988)Magnetic fractions separated from four deep sea sediments from the Pacific Ocean were analysed for elemental abundances and isotopic ratios of noble gases by stepwise heating. A ratio of (1.8 ± 0.4) × 10−4 was observed in ...
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(2001)The relationship between the K-Ar dates of mixed natural clays and the ratios of detrital and diagenetic components follows in most cases a linear trend, which agrees with the theory when the K2O contents of the end-members ...
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(2000)The based membrane extraction of Th4+ and Yb3+ was studied in HBTMPP-heptane using a hollow fibber membrane. The separation method of Th4+ and Yb3+ was proposed by kinetics competition. The separation operation of Th4+ and ...
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(1999)The geoid, an equipotential surface of Earth's gravity field, reflects the distribution of mass within the planet and hence a variety of geodynamic processes. Because these data are dominated by sublithospheric processes, ...
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(1989)Recently, there is a significant interest in prospecting for and developing non-traditional types of hydrocarbon resources, as petroleum bitumens, gas hydrates, oil shales, and ozokerite. Significant reserves of such ...
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(1995)An atomic absorption method (graphite furnace) has been developed for the determination of 0.01--100 μg g-1 As, Sb, Se and Te in rocks, minerals and ores. It is based on extractive preconcentration of these elements by a ...
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(2002)We use time series analysis to compare the impact histories of the Earth and Moon with the record of mantle plume activity. We use events with errors in their ages of =<150 Ma. The terrestrial and lunar impact records, ...
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(1999)The Palaeoproterozoic positive excursion of δ 13Ccarb is now considered as three positive shifts of δ 13Ccarb separated by returns to 0‰, which all occurred between 2.40 and 2.06 Ma. This isotopic event is unique in terms ...
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(2002)Magma-derived fluids are important in geologic processes (e.g., metal sequestration and ore deposition) but are intrinsically transient. Samples of magmatic fluids represented by fluid inclusions in a single zoned quartz ...
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(1999)Djerfisherite [K6(Cu,Fe,Ni)25S26Cl] has been found as a daughter mineral in melt inclusions in melilite from a Kugda melilitolite. The inclusion mineral assemblage includes pyrrhotite, pentlandite, forsterite, diopside, ...
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(1998)The viscosities of a series of water-bearing peralkaline rhyolitic melts have been experimentally determined. The dry melt compositions are composed of a series of additions of Na2O to a metaluminous base composition. The ...
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(2002)We describe a phenocryst in a CO-chondrite type-II chondrule that we infer to have formed by melting an amoeboid olivine aggregate (AOA). This magnesian olivine phenocryst has an extremely 16O-rich composition Δ17O (=δ17O ...
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EXTRINSIC AND INTRINSIC MODE OF HYDROGEN OCCURENCE IN NATURAL OLIVINES: FTIR AND TEM INVESTIGATION (2001)Olivine crystals from two mantle nodules in kimberlites (pipe Udachnaya and pipe Obnazennaya, Yakutiya, Siberia) were investigated using EMP, TEM, AEM and FTIR techniques to determine the mode of hydrogen occurrence in ...
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(2004)3D numerical studies have shown that the vertical voltage above the Baikal deep-water fault is detectable and that respective transfer functions, Ez-responses, are sensitive to the electrical resistivity changes of the ...
Now showing items 5260-5279 of 39124