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Browsing ELibrary by Title
Now showing items 1618-1637 of 21934
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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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(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 ...
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(2005)The fractionation of the isotopes of Mo between different geological environments has recently been determined to high accuracy using mass spectrometry (Barling et al., 2001). Fractionation is observed between Mo in seawater, ...
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(2004)17O NMR shieldings are calculated for the central O in the molecular model OM6(OH)12-2, for crystalline alkaline earth oxides, MO, where M=Mg, Ca, and Sr, using both Hartree-Fock and hybrid Hartree-Fock density-functional ...
Now showing items 1618-1637 of 21934