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Browsing ELibrary by Title
Now showing items 13957-13976 of 21936
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(2004)Geochemical observations demonstrate that Earth's mantle is heterogeneous, but the sizes, forms, and characteristics of its reservoirs are not constrained. Using laboratory experiments, we have systematically studied a ...
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(1998)Terrestrial noble gas isotope geochemistry provides one of the most powerful geochemical tools presently available for understanding the volatile evolution of the Earth. The data require the existence of isolated reservoirs ...
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(1999)Cold-seep communities have relatively low diversity, are dominated by one or two taxa present in high density and high biomass in comparison with the surrounding fauna, and are restricted to aphotic habitats. Their associated ...
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(1990)Since the 1950's, a large body of information has been collected on the structure and geophysical characteristics of Antarctica. Data from seismic stations both in the interior of the continent and on its coast indicate ...
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(2001)As a physical phenomenon, earthquakes must be predictable to a certain degree. However, the problem is dif®cult, becausethe source volume inside the earth is inaccessible to direct observation and because the most important ...
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(2001)The sedimentary-diagenetic structure stromatactis is widespread in Palaeozoic spiculitic carbonate mud mounds, but occurs only sporadically in Mesozoic sponge carbonate mud mounds. Comparative analysis of Palaeozoic and ...
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(2003)The common observation of sedimentary basin inversion in orogenic forelands implies that rifts constitute weak areas of the continental lithosphere. When compressed, the rifts respond with uplift of the deepest parts and ...
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(1996)Wide angle X-ray scattering (WAXS) measurements have been made on a suite of ''two-line'' ferrihydrite (FHY2) samples containing varying amounts of coprecipitated arsenate. Samples prepared at pH 8 with counter ions chloride, ...
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(1999)Bacterial populations found in subglacial meltwaters and basal ice are comparable to those in the active layer of permafrost and orders of magnitude larger than those found in ice cores from large ice sheets. Populations ...
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WITTITE WITH SE-RICH COSALITE AND BISMUTHINITE FROM NEVSKOE TIN DEPOSIT (MAGADAN DISTRICT, RUSSIA) (1992)A second confirmed occurrence of wittite, one of the four known Pb-Bi-Se-sulfosalts, has been found in the Nevskoe tin deposit (Eastern Siberia). Microprobe analyses of wittite show pronounced variation of Se content (from ...
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(1988)Processes that alter wolframite already begin under endogene conditions, almost immediately after its crystallization from hydrothermal solutions, and lead to its total breakdown or replacement at that time or later in the ...
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(2000)Measurements of the dissolution rates of wollastonite in solutions with pH ranging from 2 to 6 in an externally recycled mixed flow reactor show that the concentrations of Ca and Si in the reactor effluent decline with ...
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(2002)X-ray absorption fine structure (XAFS) measurements was used at the U L3-edge to directly determine the pH dependence of the cell wall functional groups responsible for the absorption of aqueous UO22+ to Bacillus subtilis ...
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(2003)X-ray absorption fine structure (XAFS) spectroscopic analysis at the As, Se, and Mn K-edges was used to study arsenate [As(V)O-4(3-)] and selenite [Se(IV)O-3(2-)] sorption complexes on the synthetic hydrous manganese oxides ...
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(1999)Sorption processes typically control trace metal concentrations in aquatic systems. To illustrate the impact of various types of surface sites on metal ion sorption behavior, Co(II) and Sr(II) sorption by several clay ...
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(2003)We present X-ray absorption near-edge structure (XANES) spectroscopy of 11 silicate and aluminosilicate minerals and two glasses at the SiK and SiL2,3, and OK edges. The similar nearest-neighbor environments lead to similar ...
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(2002)X-ray absorption spectroscopy (XAS) has developed into a powerful tool for the study of all types of materials since the early 1970s, when strong sources such as synchrotrons became available from which experimental spectra ...
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(2002)We report results from in situ extended X-ray absorption fine structure (EXAFS) spectroscopy studies of Cu(II) and Zn(II) complexes forming at the calcite surface following adsorption from preequilibrated calcite-saturated ...
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(2000)Sulfate is one of the most abundant inorganic ligands in the lithosphere and hydrosphere. It plays a major role in mediating mineral dissolution and precipitation, crystal growth, mineral–water and air–water interfacial ...
Now showing items 13957-13976 of 21936