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Now showing items 7655-7674 of 39124
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(1989)In an earlier paper, we used an isotopic investigation of the mineral associations of a tin deposit of the cassiterite-silicate association to bring out a trend in the isotopic composition of oxygen in the aqueous phase ...
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(2003)We have analyzed by thermal ionization mass spectrometry (TIMS) the isotopic composition of Cr in five progressive etches of size-sorted plagioclase grains separated from lunar soils 60601 and 62281. Aliquots of the etch ...
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ISOTOPIC COMPOSITION OF THE SULFUR IN PYRITE AND PYRRHOTITE SYNTHESIZED AT 300 TO 500°C AND 1 KBAR (1989)The isotopic composition of the sulfur in synthetic pyrite (Pt) and pyrrhotite (Pr) was studied as a function of the reaction temperature (T) and oxygen fugacity fO2. These minerals were synthesized by the hydrothermal ...
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(1989)Investigating the isotopic characteristics of carbon in eclogite from kimberlite is of interest both for identifying the character of the eclogite material itself and for investigating the fractionation of carbon under ...
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(2006)We determined by ICP-MS the concentrations and isotopic ratios of Fe, Cu, and Zn in the Ti-rich lunar basalt 74275, in the lunar orange glass 74220, and in up to 10 lunar soils, namely, 14163, 15231, 64501, 66041, 68841, ...
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(1995)We report ion microprobe determinations of carbon, nitrogen, oxygen, magnesium-aluminum, and silicon isotopic compositions and trace element (H, N, O, Al, Si) concentrations of individual graphite grains (0.8-28 μm) from ...
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(2005)Large, correlated, mass-dependent enrichments in the heavier isotopes of O, Cr, Fe, and Ni are observed in type-I (metal/metal oxide) cosmic spherules collected from the deep sea. Limited intraparticle variability of oxygen ...
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(2000)Polycrystalline aggregates of bort-type diamond with inclusions of garnet and rutile from the Mir pipe have delta C-13 of -3.7 to -22.9 parts per thousand PDB. The bort of variety VIII (Yu.L. Orlov's classification) differs ...
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(2004)Cycling of redox-sensitive elements such as Fe is affected by not only ambient Eh-pH conditions, but also by a significant biomass that may derive energy through changes in redox state (e.g., Nealson 1983; Lovely et al. ...
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(2004)A new model of continuous diffusion of radiogenic isotopes was applied to mineral 147Sm–143Nd and 176Lu–176Hf data on low-temperature garnet-peridotite xenoliths from Cretaceous South African kimberlites. The radiometric ...
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(1988)The authors studied the SM-Nd and Rb-Sr isotope systems in meymechite and picrite from the Maymecha-Kotuy alkalic province at the north margin of the Siberian craton. Meymechite and picrite here form numerous dikes and ...
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(2000)The geochemical consequences of crustal anatexis are investigated over a range of mineral dissolution rates; 10-10 cm/s (Mono Lake, CA), ~10-16 cm/s (Seram, Indonesia) and <10-16 cm/s (regional migmatite terranes). Isotopic ...
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(2001)A survey of the δ13C and δ18O values of CaCO3 precipitated by marine calcareous algae was conducted to examine 'vital effects' produced by the various styles of calcification of the major algal subdivisions (Codiacea, ...
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(2006)A mathematical model is presented that describes the effects of pore fluid aqueous diffusion and reaction rate on the isotopic exchange between fluids and rocks in reactive geo-hydrological systems where flow is primarily ...
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(Федеральное государственное автономное образовательное учреждение высшего образования «Санкт-Петербургский национальный исследовательский университет информационных технологий, механики и оптики», 2018)We consider isotopic effects on the photoluminescence of recently discovered germanium-vacancy (GeV ) color center in diamond produced by the high-pressure high-temperature (HPHT) treatment. It was demonstrated that the ...
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(1996)Experiments using isotopically enriched, Sr doped minerals designed to test for isotopic equilibrium between source and melt during partial melting reveal that 87Sr86Sr ratios of the liquids are primarily determined by the ...
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(2003)The Caucasian orogenic wedge formed as a consequence of the closure of the Tethyan Ocean, and numerous fields of active mud volcanoes pepper the area adjacent to the Black and Caspian Seas. Stable isotope ratios of boron, ...
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(2003)Strontium-, oxygen- and carbon-isotope ratios have been determined from Late Jurassic–Early Cretaceous belemnites from the Volga Basin, Russia, and Kawhia Harbour, New Zealand. 87Sr/86Sr ratios derived from well-preserved ...
Now showing items 7655-7674 of 39124