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Browsing ELibrary by Title
Now showing items 1623-1642 of 21934
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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 ...
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(2004)The existence of ether or ester-like complexes of silicate with organic compounds has long been debated in the literature on biological utilization of silicon. Comparison of theoretically calculated 29Si NMR chemical shifts ...
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(2000)A computing scheme for estimating the isothermal increments of main thermodynamic characteristics of gases under the geobarometrical conditions of the Earth's crust and upper mantle has been developed. An FGL unit built ...
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(2002)Patterns of dike swarms around volcanic centers or above mantle plumes are interpreted by a mechanical analysis of regional and dike-induced stresses, in which dike emplacement is controlled and guided by the stress state. ...
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(2003)In many parts of the world the frequency of river floods (flash floods) seems to have increased during the past half century. Intensified agriculture is considered as a possible cause for the changed peak flow behavior. ...
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(2001)Destruction of rocks under shock load action has been considered. In this case, it is necessary to predict propagation of crack at known external load. The prediction is possible in case of calculation of stressed state ...
Now showing items 1623-1642 of 21934