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Browsing by Title
Now showing items 7648-7667 of 39068
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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 ...
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(1998)Stable isotopic measurements have been made on both planktonic foraminifera and coccolithic matrix of Middle Cretaceous (Late Albian-Cenomanian) age from two Pacific low latitude sites. The degree of alteration of the ...
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(2004)A part of the boundary layer of reactor zone 10 at the Oklo natural reactor shows a unique petrologic texture, which contains high-grade uraninite and massive apatite concretions. In order to study distribution behavior ...
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(2000)Oxygen isotope exchange between minerals and water in systems far from chemical equilibrium is controlled largely by surface reactions such as dissolution-precipitation. In many cases, this behavior can be modeled adequately ...
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(2004)The increasing popularity of compound-specific hydrogen isotope (D/H) analyses for investigating sedimentary organic matter raises numerous questions about the exchange of carbon-bound hydrogen over geologic timescales. ...
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(2002)The oxygen three-isotope plot provides valuable insights to geochemical and cosmochemical processes in which the relationship of 17O/16O relative to 18O/16O is of interest. It is generally recognised, however, that the ...
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(2000)Development of isotopic fractionation in a condensed phase during congruent evaporation by abrupt heating is modeled to estimate heating conditions in the solar nebula. Effects of elemental diffusion in the condensed phase, ...
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(2002)Large equilibrium isotope fractionation occurs between Fe(III) and Fe(II) in very dilute (≤22 mM Cl−) aqueous solutions, reflecting significant differences in bonding environments. Separation of Fe(III) and Fe(II) is ...
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(2005)The extent of fractionation of sulfur (S) isotopes during precipitation of basaluminite and alunite in supersaturated Al2 (SO4)3 solutions was determined in a laboratory synthesis experiment. An acid 0.05 M Al2 (SO4)3 ...
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(2004)Minerals from some talc, tungsten, and gold deposits in the Urals are genetically related to fluids similar in oxygen and hydrogen isotopic compositions. The hydrogen isotopic composition is typical of magmatic fluids. ...
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(1995)Variations in the isotopic composition of rocks derived from the upper mantle can be used to infer the chemical history and structure of the Earth's interior. The most prominent material in the upper mantle is the source ...
Now showing items 7648-7667 of 39068