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Now showing items 11998-12017 of 39126
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(2007)Radiocarbon dating is widely used when studying recent volcanic activity in the Kamchatka Peninsula due to the abundance of organic matter that is associated with the volcanic deposits. Here, we present the results of 14C ...
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(1998)Radiocarbon (#14C) and stable carbon isotopes (δ13C) were measured in total hydrolyzable amino acid (THAA), total carbohydrate (TCHO), total lipid, and acid-insoluble organic fractions that had been separated from ...
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(1998)Radiocarbon (Δ14C) and stable carbon isotopes (δ13C) were measured in total hydrolyzable amino acid (THAA), total carbohydrate (TCHO), total lipid, and acid-insoluble organic fractions that had been separated from ...
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(2001)Evaluation of 14C in tree rings provides a measure of the flux of magmatic CO2 from Mammoth Mountain both before and after 1994 when copious diffuse emissions were first discovered and linked to tree kill. We analyzed the ...
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(1999)Reduced 4He/3He ratios, e.g., down to ≈1/100 times those expected from radiogenic production, were observed in sedimentary rocks. Formation and history of these rocks eliminate a contribution of mantle 3He-bearing fluid. ...
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(2002)The inorganic silicate fraction extracted from bulk pelagic sediments from the North Pacific Ocean is eolian dust. It monitors the composition of continental crust exposed to erosion in Asia. 176Lu/177Hf ratios of modern ...
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(2001)Mantle isochrons such as those observed for oceanic basalts in the 207Pb/204Pb vs. 206Pb/204Pb diagram do not date discrete differentiation events but are often suggested to reflect a mean age of differentiation within the ...
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(2001)Radiogenic isotopes studied in fluid inclusions are still a limited field, with great potential for expansion as analytical techniques improve. The main limitation for Sr, Ar and He isotope work is the very small number ...
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(2004)Radiogenic isotopes have wide application to chemical stratigraphy, geochronology, provenance studies, and studies of temporal changes in Earth surface processes. This paper briefly reviews the principles of radiogenic ...
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(2004)The paper presents the results of a survey of underwater disposal sites of potentially hazardous objects in the Kara Sea and Stepovogo Bay. The real levels of radioactivity were determined in the near and remote zones of ...
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(2001)Stokes' viscometry combined with in situ X-ray radiographic observation, using the 6-8 type multi-anvil press and synchrotron radiation, has been applied to the viscosity measurement of the Fe-FeS melt up to pressures of ...
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(2002)New data on the Maastrichtian stratigraphy in the eastern Tajik depression are discussed. Scarce remains of macrofauna and significant facies variability are main impediments to precise correlations between deposits of ...
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(2000)Radiolarian productivity pulses and related radiolarite deposition are phenomena difficult to understand from an exclusively actualistic viewpoint. Evolutionary selection pressure among silica-secreting marine plankton, ...
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(2004)Radiolarians from the Novodevich'e section, Samara oblast, are described. Two subdivisions of the section correspond to the 6.5-m-thick member of clay and chalk with Turonian-Coniacian benthic foraminifers and to the other ...
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(PANGAEA, 2000-11-01)
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(1997)The number and age of hyperacidic volcanism events in late-orogenic troughs of the Chatkal-Kurama structural zone are discussed on the basis of the radiometric dating. All K-Ar data available are used, including 90 original ...
Now showing items 11998-12017 of 39126