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Browsing ELibrary by Title
Now showing items 6181-6200 of 21821
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(2004)Considered is the process of isotopic separation capable to explain the anomalous isotopic composition of sulfur of Norilsk deposits without employing the concepts of crust sulfur contamination. The estimation of isotopic ...
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(2004)This contribution presents the first detailed oxygen and carbon isotope record from the latest Jurassic-early Cretaceous interval of the Yatria River, subpolar Urals, Siberia. Isotopic compositions have been determined on ...
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(2000)Nitrogen concentrations and isotopic signatures have been determined in groups IIE and IVA iron meteorites. Contrary to assumptions made in the literature, the present data show that spallation components significantly ...
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(1999)Carbon and oxygen isotope variation curves for Vendian-Lower Cambrian carbonates of the Bokson Group are correlative with those characterizing coeval sections in Siberia and western Mongolia. The curves demonstrate the ...
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(2000)Isotopic compositions of Sm and Gd in eight chondrites (Mezo-Madaras, Parnallee, Otis, Suizhou, Zhaodong, Allende, Bruderheim and Y-74191) were measured to study neutron capture effects due to the interaction of cosmic ...
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(1997)One hundred and forty individual SiC grains (1-9.6 μm) and twenty-two grain aggregates (2.3-7.8 μm) from the Orgueil (CI) chondrite have been measured by ion microprobe. Silicon and carbon isotopic data were obtained for ...
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(1995)We have developed a simple model which describes the evolution of isotopic and chemical heterogeneities of radiogenic systems in a reservoir undergoing differentiation, input and convection. We demonstrate that for ...
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(2005)We conducted a year-long, intensive monitoring program of live aquatic gastropods (Helisoma duryi, Melanoides tuberculata, Physa virgata, Pyrgulopsis sp., and Tyronia sp.) and their host springs in the Ash Meadows National ...
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(1997)The cause of the nitrogen isotopic anomalies observed by Hashizume and Sugiura (1995) among bulk equilibrated ordinary chondrites has been investigated. The bulk nitrogen isotopic anomalies can be explained by the isotopically ...
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(2002)Hydrogen isotopic exchangeability (Hex) and δDn values of non-exchangeable organic hydrogen were investigated in coal kerogens ranging in rank from lignite to graphite. The relative abundance of Hex is highest in lignite ...
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(2001)Diagenetic incorporation of uranium into bone material establishes a U-Pb system that provides a minimum age for the fossil. Loss of Rn and Ra from the 238U-decay series, recent mobility of U and Pb, and incorporation of ...
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(1997)The evaluation of the economic importance of bacterial methane is still a matter of discussion, linked to the evolution of the geochemical understanding. Methane occurrence or accumulations with light isotopic ratios, both ...
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(1996)We present a new approach for the rationalization of trace element partitioning between silicate melts and minerals, which is not based on the empirical, parameterised continuum models in common use. We calculate the ...
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(2003)Spherical objects, identified as microfossils and named Isuasphaera isua (Pflug), were reported in 1978 from a chert in the 3.7-3.8Ga Isua Greenstone Belt (IGB). Soon afterwards the biological nature of these objects was ...
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(2006)Itatodon tatarinovi Lopatin et Averianov, 2005 известен по двум нижним молярам и фрагменту нижнего моляра из верхней части итатской свиты (батский ярус) Березовского карьера на юге Красноярского края. По наличию псевдоталонида, ...
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(2000)The 1989 IUGS classification of the igneous rocks for the high-Mg and picritic volcanic rocks has been revised. Instead of an 18 wt % MgO minimum limit being applied for all high-Mg and picritic volcanic rocks, that is now ...
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(2003)The discrimination between chemical and thermal heterogeneity in the Earth's mantle remains one of the most important and challenging questions to be answered by observational and theoretical geophysics. To answer this ...
Now showing items 6181-6200 of 21821