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Browsing Геология России by Title
Now showing items 2175-2194 of 39124
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(2002)Carbonate – amphibole – clinopyroxene rocks and carbonatites from the Afrikanda complex, in the Kola Peninsula, Russia, contain a number of oxysalt minerals, including major calcite (15–95 vol.%), subordinate hydroxylapatite, ...
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(2002)A calcite - amphibole - clinopyroxene rock (CAPR) occurs as branching veins and segregations in ultramafic alkaline lithologies of the Afrikanda complex, Kola Peninsula, in Russia. The rock is composed predominantly of ...
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(2006)Sedimentary basins can contain close to 20% by volume of pore fluids commonly classified as brines. These fluids can become undersaturated with respect to calcite as a result of migration, dispersive mixing, or anthropogenic ...
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(1999)Although calcite is a common vein-filling mineral in rocks, there has been little understanding of the kinetics of vein-filling that gives a quantitative estimation of the fluid volume and time needed for calcite vein ...
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(1999)Calcium adsorption by rutile was studied potentiometrically from 25 to 250°C, at ionic strengths of 0.03 and 0.30 m in NaCl media, using two complementary experimental methodologies. In the first, net proton adsorption in ...
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(2004)We report the benthic fluxes of O2, titration alkalinity (TA), Ca2+, NO3-, PO43-, and Si(OH)4 from in situ benthic flux chamber incubations on the Ceara Rise and Cape Verde Plateau and compare them to previously published ...
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(1990)The equilibrium Ca content of olivine coexisting with clinopyroxene was experimentally determined in natural lherzolitic compositions (Mg/(Mg + Fe)ol ≈ 0.9). The experiments from 2–60 kb and 900–1400°C cover most of the ...
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(PANGAEA, 2008-07-10)
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(2005)Calcium isotope fractionation was measured on skeletal aragonite and calcite from different marine biota and on inorganic calcite. Precipitation temperatures ranged from 0 to 28°C. Calcium isotope fractionation shows a ...
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(2006)The 44Ca/40Ca ratios of cultured (Acropora sp.) and open ocean (Pavona clavus, Porites sp.) tropical reef corals are positively correlated with growth temperature. The slope of the temperature-fractionation relation is ...
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(1989)The authors found mottramite, a rare lead vanadate and an end member in the mottramite-descloizite series together with pyromorphite in the outer contact zone of the Murun pluton in Yakutia. It was enclosed in a peculiar ...
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(1996)We have measured the diffusion coefficient of 44Ca along and perpendicular to c direction in natural Fe-bearing (~2 at.%) diopside single crystals. Specimens were annealed at temperatures ranging from 1000 to 1250oC, with ...
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CALCIUM-ALUMINUM-RICH INCLUSIONS AND AMOEBOID OLIVINE AGGREGATES FROM THE CR CARBONACEOUS CHONDRITES (2002)Calcium-aluminum-rich refractory inclusions (CAIs) in CR chondrites are rare (<1 vol%), fairly small (<500 um) and irregularly-shaped, and most of them are fragmented. Based on the mineralogy and petrography, they can be ...
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(2006)The calcium-isotope composition (?44/42Ca) was analyzed in modern, Cretaceous and Carboniferous marine skeletal carbonates as well as in bioclasts, non-skeletal components, and diagenetic cements of Cretaceous and Carboniferous ...
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(2004)Petrogenetic grids in the KFMASH and KMnFMASH model systems calculated with the software thermocalc 3.1 are presented for the P-T range 0.5-12 kbar and 450-900 °C, for assemblages involving garnet, muscovite, chloritoid, ...
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(2004)Using an internally consistent thermodynamic dataset and updated models of activity–composition relation for solid solutions, petrogenetic grids in the system NKFMASH (Na2O–K2O–FeO–MgO–Al2O3–SiO2–H2O) and the subsystems ...
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(2006)Petrogenetic grids in the system NCKFMASH (Na2O–CaO–K2O–FeO–MgO–Al2O3–SiO2–H2O) and the subsystems NCKMASH and NCKFASH calculated with the software THERMOCALC 3.1 are presented for the P–T range 7–30?kbar and 450–680°C, ...
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(1997)Solution energies are calculated for a wide range of heterovalent impurities in forsterite and diopside, using atomistic simulation techniques and a consistent set of interatomic potentials to represent the non-Coulombic ...
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(2000)Ab initio molecular orbital theory was used to calculate deprotonation energies and enthalpies (ΔEd, ΔHd) of oxyacid monomers and oligomers. Results were interpreted with reference to current phenomenological models for ...
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(2001)NMR provides one of the most effective ways of identifying and quantifying the species present in a geochemical system (Engelhardt and Michel 1987; Kirkpatrick 1988). NMR shifts and other properties (such as quadrupole ...
Now showing items 2175-2194 of 39124