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Browsing ELibrary by Title
Now showing items 8926-8945 of 21936
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(2003)The distribution of the rare earths and other trace elements in calcic amphiboles from the Njurundukan mafic complex, northwestern Baikal region, in Russia, depends on metamorphic grade. Both total REE and La/Yb in amphiboles ...
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(1998)Chemical diffusion of Pb under anhydrous, pO2-buffered conditions has been measured in natural clinopyroxenes of two different compositions: one a near-end-member diopside and the other of more iron-rich composition (~40% ...
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(2001)Chemical diffusion of Pb under anhydrous, pO2-buffered conditions has been measured in natural pyroxenes of three different compositions: a chromian diopside, an augitic clinopyroxene, and a near-end member enstatite. ...
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(2004)We report measurements of Pb diffusion in both synthetic (CePO4) and natural monazites run under dry, 1-atm conditions. Powdered mixtures of prereacted CePO4 and PbZrO3 were used as the source of Pb diffusant for “in-diffusion” ...
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(2006)We have measured Pb diffusivity in synthetic NdPO4 crystals from an epitaxial Nd0.66Pb0.17Th0.17PO4 thin film deposited on (-1 0 1) faces. Annealings were performed at room pressure at temperatures ranging from 1200 to ...
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(2000)Diffusion of Pb was measured in natural and synthetic rutile under dry, 1 atmosphere conditions, using mixtures of Pb titanate or Pb sulfide and TiO2 as the sources of diffusant. Pb depth profiles were then measured with ...
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(2001)Diffusion of Pb was characterized in natural and synthetic zircon under a range of conditions. In most experiments, mixtures of Pb sulfate and ground zircon were used as the sources of diffusant, with Pb depth profiles ...
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(2001)Modern deep sea turbidite muds and sands collected from Lamont piston cores represent a large range in age of detrital sources as well as a spectrum of tectonic settings. Pb isotope compositions of all but three of the 66 ...
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(1997)Isotopic variation in ocean island basalts (OIB) is commonly attributed to mixing between four distinctive isotopic components in the mantle. One of these, HIMU, is the only contributor of lead with 206Pb/204Pb > 19.2 to ...
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(2004)The Pb isotopic compositions of phenocrystic phases in young basaltic lavas have been investigated using the Getty-DePaolo method (Getty S. J. and DePaolo D. J. [1995] Quaternary geochronology by the U-Th-Pb method. Geochim. ...
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(1994)The Salmi batholith is situated on the eastern edge of the EW-trending anorthositerapakivi granite belt of the Fennoscandian shield, at the contact between Proterozoic and Archean crustal domains. The tectonic setting and ...
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(2001)The carbonate Malgina Formation, a constituent of the Riphean hypostratotype in Siberia, corresponds, according to paleontological evidence, to the terminal Middle Riphean horizons, and present-day geochronological data ...
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(2003)The carbonate rock investigation was based on the combined analysis of U-Pb- and Rb-Sr-systematism for the same samples. For the first time in the practice of studying the Upper Yudoma carbonate rocks of Eastern Siberia ...
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(2004)For the first time presented are U-Pb isotope analysis data for three kimberlite samples from two Nakyn field pipes (Botuobinskaya and Nurbinskaya) in combination with their new Sr-Nd characteristics and ICP-geochemistry. ...
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(2002)Pb-Sr-Nd isotopic compositions determined for potassic ultramafic and mafic rocks from some localities in the north of the East European platform characterize compositionally variable magma sources. Kimberlites of the ...
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(1997)Peculiar features of typification in stratigraphy, i.e., the regulation of the entitative aspect of a stratigraphic unit and its legalization in the stratotype, were analyzed. These procedures inevitably led to the repudiation ...
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(2001)New data are presented on fluid inclusions in quartz, gold, and host schists studied by Raman spectroscopy, gas chromatography, thermometric and cryometric methods. Stable sulfur isotope characteristics were determined in ...
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(2004)Sulfide copper-nickel deposits in differentiated ultrabasic and basic rocks are the most important sources of gold and silver. Slope deposits have been detected. They are new and non-traditional ore deposits. Concentration ...
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(2004)Based on geological, mineralogical, and petrographic data and results of thermometric and microanalytical (electron probe microanalysis and atomic-emission spectroscopy) studies of fluid inclusions (FI), the major factors ...
Now showing items 8926-8945 of 21936