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Browsing ELibrary by Title
Now showing items 10482-10501 of 21821
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(1994)Mass balance and compositional variation in the outer part of the contact aureole shows that mass transfer of the main petrogenetic components was confined to small domains of a few hundredths of mm3 in chlorite-biotite-mica ...
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(1988)We investigated double chain silicates (amphiboles), whose structures contain three octahedral positions. A shift in the frequency of the IR vibrations of the hydroxyl group at one vertex of these octahedra was used to ...
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(1988)Continuous observations of those characteristics of natural fields that were identified as likely to be useful in forecasting are being made at a network of integrated prediction stations in the geodynamic survey areas of ...
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(2002)Shallow lakes in a continental, low Arctic setting are found to undergo substantial fluctuations in heavy-isotope content during the annual cycle due to extreme seasonality in water balance processes. Progressive isotope ...
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(2004)I review the short-term properties of earthquake catalogs, in particular the time and size distributions and the completeness of the early part of aftershock sequences for strong, shallow earthquakes. I determine the ...
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(1997)Previous research on the short-time dissolution behavior of kaolinitic Oxisols suggested pH-dependent kinetics involving ligand-promoted dissolution, metal readsorption, and colloidal dispersion, with soil organic matter ...
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(2004)High-precision SHRIMP zircon U-Pb dating has revealed that the Ertaibei granodiorite in eastern Junggar, northern Xinjiang, was formed at 299.3±8.7Ma, which represents the age of magma emplacement into upper crust, and ...
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(2004)Si and Mg isotopic compositions of melilite in three coarse-grained CAIs were measured by SIMS. Isotopic compositions of these elements were fractionated (1.0 to 2.9 ‰/amu for Si and 4.6 to 9.6 ‰/amu for Mg) relative to ...
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(2004)High-pressure high-temperature experiments have been carried out up to 25 GPa and 2200°C in a multianvil press on assemblages made of silicates and iron-silicon alloys. At 20 GPa, silicon is extracted from the metal phase, ...
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(2003)Quantitative determination of the abundance of Si(nAl) tetrahedral structural units (where n = 0, 1, 2, 3, or 4) through analysis of 29Si magic angle spinning nuclear magnetic resonance (MAS NMR) spectra was used to assess ...
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(2003)An analysis of the Riphean sedimentary successions along the margins of the Siberian craton, together with recent geochronological and palaeomagnetic data from Siberia, require a revision of the hypothesis that Siberia was ...
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(2002)The sialic (volcanogenic) material of the terranes in 3the Siberian fragment of a Paleoproterozoic supercontinent separated from the mantle 3.5, 3.3, 3.0, and 2.5 billion years ago. The collision zones (sutures) between ...
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(1993)In this study Cu, Ni, and platinum-group elements (PGE) were determined in a sequence of basaltic and picritic lavas from the Siberian Trap in the Noril'sk area of Russia to constrain genetic relationships between the ...
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(2002)Laser ablation inductively coupled plasma mass spectrometry was used to measure abundances of P, Cr, Fe, Co, Ni, Cu, Ga, Ge, As, Mo, Ru, Rh, Pd, Sn, Sb, W, Re, Os, Ir, Pt, and Au in metal grains in the Bencubbin-like ...
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(1999)We report a series of metal-silicate partitioning experiments for Ga, Ge, and Sn to characterize the dependence of the partition coefficient, D, on oxygen fugacity, fO2. These were isothermal (1260°C) and isobaric (1 bar) ...
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(2003)Siderophores are Fe(III)-specific ligands produced by many aerobic microorganisms under conditions of iron stress. This study examined adsorption of the commercial trihydroxamate siderophore, desferrioxamine B (DFO-B), to ...
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(2002)The purpose of this study was to quantify siderophore production by the aerobic bacterium, Pseudomonas mendocina, under Fe-limited conditions as a function of Fe source: supplied in dissolved form (as 30 μM Fe-EDTA), as ...
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(1995)Siderophores are highly Fe(III)-specific bidentate ligands excreted by aerobic and facultative anaerobic microorganisms to facilitate Fe uptake in oxic environments. These compounds are thought to influence mineral weathering ...
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(2005)Metal ions have critical functions in biological processes and provided important biological feedbacks with the environment throughout earth history. For example, Fe, Ni, Mg, Mn, Mo, Cu, W, V, and Zn play an essential role ...
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(2003)Pyroxenes of pigeonitic and augitic bulk compositions in H3-4 chondritic meteorites commonly exhibit sigmoidal precipitates, rather than the elsewhere common lamellar associations. Most often, submicrometric sigmoids with ...
Now showing items 10482-10501 of 21821