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Browsing ELibrary by Title
Now showing items 11497-11516 of 22924
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(2001)The source potential and organic maturity of the shales alternating with the reservoir beds in the Lower Pliocene Productive Series - the major oil-bearing unit in the South Caspian Basin - are inadequate to have formed ...
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(2002)Source scaling properties are studied for the intermediate-depth seismic nest in the Vrancea region, Romania, which has been the source of many destructive earthquakes. We investigate spectral and time-domain scaling ...
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(2006)A major fraction of particulate organic carbon (POC) in the deep ocean remains molecularly uncharacterized. In an effort to determine the chemical characteristics and source(s) of sinking POC, we studied a nonhydrolyzable ...
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(1997)B and Nb concentrations and B isotope composition were determined for lavas covering the entire length of the Kurile arc. B/Nb and δ11B of these lavas show clear across-arc variations in which both are highest at the trench ...
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(2001)We present new data on the distribution and composition of n-alkanes (biomarkers) and humic acids in the Holocene and Pleistocene bottom sediments of Northern Baikal accumulated under different sedimentation and paleoclimatic ...
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(2006)Amino sugars are involved in the marine carbon and nitrogen cycles and comprise a geochemically significant fraction of marine organic material (OM). However, information on abundance and distribution of these compounds ...
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(2001)Major and trace element and Sr Nd Pb isotopic variations ill mafic volcanic rocks hve been studied in a 220 km transect across the Kamchatka are from the Eastern Volcanic Front, over the Central Kamchatka Depression to the ...
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(1988)Accepted concepts of principal stages of hydrocarbon formation fail to satisfactorily explain the accumulation of supergiant gasfields in West Siberia, U.S.S.R., such as for example Urengoy, which comprise 30% of the proven ...
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(2001)Carbon isotopic analyses of 24-ethylcholest-5-en-3β-ol in a marine sediment core (KH-79-3, C-3) covering the last 30,000 years, using gas chromatography/isotope ratio mass spectrometry (GC/IRMS), are presented. The source ...
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(2002)We present new analytical data on the isotopic composition of whole-rock samples taken from 26 Paleozoic granitoid plutons in the central and southern Urals; the age of these plutons is known with confidence. In addition, ...
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(2003)According to the results of isotopic and geochemical investigations (neodymium, strontium, and oxygen isotopes and trace elements), the Early Mesozoic rocks of the Mongolia-Transbaikalia magmatic area were derived from ...
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(2003)According to the results of isotopic and geochemical investigations (neodymium, strontium, and oxygen isotopes and trace elements), the Early Mesozoic rocks of the Mongolia-Transbaikalia magmatic area were derived from ...
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(2004)High precision Os isotope analysis of young marine manganese nodules indicate that whereas the composition of modern seawater is radiogenic with respect to 187Os/188Os, it has 186Os/188Os that is within uncertainty of the ...
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(2004)The Central Asian Orogenic Belt (CAOB) is renowned for massive generation of juvenile crust in the Phanerozoic. Mongolia is the heartland of the CAOB and it has been subject to numerous investigations, particularly in ...
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(2001)A review is presented on published geochemical and isotopic (Sm-Nd and Rb-Sr) data on the worldwide occurrence of rare-metal granites and greisens in comparison with barren granites of the I and S types. The ratios of major ...
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(1999)The carbon-cycle significance of soil carbonate fluxes is subject to large uncertainties because it is not clear precisely how much calcium is derived from atmospheric sources compared with that from the chemical weathering ...
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(2001)Carbonatites of the western Transbaikalia rift zone were formed in the middle of the Early Cretaceous (130-120 Ma) and are represented by lavas, tuffs, dikes, and veins. They are associated with other highly alkaline ...
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(2001)Potassic magmas (their derivatives, kimberlites and others) are among the products of incipient mantle melting, which occurs at an increase in heat flow (plume ascent). They provide reliable information on the composition ...
Now showing items 11497-11516 of 22924