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Browsing ELibrary by Title
Now showing items 13460-13479 of 24608
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SULFUR ISOTOPE COMPOSITION OF PUTATIVE PRIMARY TROILITE IN CHONDRULES FROM BISHUNPUR AND SEMARKONA (2005)The sulfur isotopic compositions of putative primary troilite grains within 15 ferromagnesian chondrules (10 FeO-poor and 5 FeO-rich chondrules) in the least metamorphosed ordinary chondrites, Bishunpur and Semarkona, have ...
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(1998)In bacterial cultures we measured sulfur isotope fractionation during transformations of thiosulfate (S2O32-) and sulfite (SO32-), pathways which may be of considerable importance in the cycling of sulfur in marine sediments ...
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(1997)Isotope fractionation during sulfate reduction by natural populations of sulfate-reducing bacteria was investigated in the cyanobacterial microbial mats of Solar Lake, Sinai and the sediments of Logten Lagoon sulfuretum, ...
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(1998)Fractionation of stable sulfur isotopes (34S/32S) during the precipitation of iron(II) and manganese(II) sulfides from aqueous solutions at room temperature (~20°C) was investigated using batch-type experiments. The sulfides ...
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(2004)Stable sulfur isotope fractionation during microbial sulfate reduction is a potential tool to estimate sulfate reduction rates at field sites. However, little is known about the influence of the utilized carbon source on ...
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(2001)Sulfate-reducing bacteria contribute considerably to the mineralization of petroleum hydrocarbons (PHC) in contaminated environments. Stable sulfur isotope fractionation during microbial sulfate reduction was investigated ...
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(2003)We studied the isotopic composition of dissolved sulfide in the Black Sea water column during different seasons at a total of 15 stations spanning the entire basin. The isotopic composition of dissolved sulfide averaged ...
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(2004)We show that the sulfur isotopic composition of sedimentary and hydrothermal pyrite is a good approximation of the average sulfur isotopic composition of the dissolved sulfide sources from which the pyrite formed. Consequently, ...
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(1998)Both the CuO [Grinenko, V.A., 1962. The preparation of sulphur dioxide for isotope analysis. Zn. Neorgan. Khim. 7, 2478-2483; Fritz, P., Drimmie, R.J., Nowicki, V.K., 1974. Preparation of sulfur dioxide for mass spectrometer ...
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(2006)The latest Permian was a time of major change in ocean chemistry, accompanying the greatest mass extinction of the Phanerozoic. To examine the nature of these changes, samples from two well-studied marine sections that ...
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(2003)Previous studies of both ore and non-ore-bearing intrusives in the Permo-Triassic flood basalts of the Siberian platform in the Noril’sk area have shown that high-grade Ni–Cu–platinum group elements (PGE) mineralization ...
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(1997)Down-core trends for extents of iron sulfidation in upper Holocene microlaminated deposits of the Black Sea abyssal plain imply that most of the pyrite in these sediments is formed in the sulfidic water column and/or very ...
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(2001)Synchrotron radiation S K-edge XANES spectra and unit-cell parameters are used to investigate the local electronic structure of non-stoichiometric binary and ternary Fe-Co-Ni monosulfide solid solution (mss; M0.923M = Fe, ...
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(2004)The effect of sulfur on phosphorus solubility in rhyolitic melt and the sulfur distribution between apatite, anhydrite, melt and fluid have been determined at 200MPa and 800–1,100C via apatite crystallization and dissolution ...
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(2004)Information about the state of sulfur in silicate melts and glasses is important in both earth sciences and materials sciences. Because of its variety of valence states from S2− (sulfide) to S6+ (sulfate), the speciation ...
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(2002)Thermally immature, extremely sulfur-rich kerogens from the Orbagnoux deposit have been extensively studied over the last few years for their chemical structure, source organisms and depositional conditions. However, ...
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(1997)Speciation of iron and sulfur species was determined for two recent sediments (La Trinitat and Lake Ciso) which were deposited in environments with a high biological productivity and sulfate-reducing activity. In sediments ...
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(2006)Measurements were made of sulphur and oxygen isotope ratios of sulphate in some Slovenian rivers, lakes and tap waters. δ34S ranged from −0.2 to + 13.3‰, δ18O ranged from +4.9 to + 13.6‰, and the sulphate content varied ...
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(2006)The study focuses on the response of a sulphate rich lowland river (River Spree) to a further increase in sulphate concentration as a result of mining activities in its catchments. It was hypothesized that riverine sediments ...
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(2000)The Palaeoproterozoic Ni–Cu sulphide deposits of the Pechenga Complex, Kola Peninsula, occur in the lower parts of ferropicritic intrusions emplaced into the phyllitic and tuffaceous sedimentary unit of the Pilgujärvi Zone. ...
Now showing items 13460-13479 of 24608