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Browsing Геология России by Title
Now showing items 2168-2187 of 39124
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(2003)The crystal structure of cafetite, ideally Ca[Ti2O5](H2O), (monoclinic, P21/n, a = 4.9436(15), b = 12.109(4), c = 15.911(5) Å, β = 98.937(5)°, V = 940.9(5) Å3, Z = 8) has been solved by direct methods and refined to R1 = ...
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(2003)The Jurassic/Cretaceous boundary interval in the northern hemisphere is characterized by the widespread occurrence of black shales. About 60% of all petroleum source rocks comprise sediments of late Jurassic and early ...
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(2002)Calcic cores in plagioclase of Karymsky andesite of the 1996–2000 eruptive cycle texturally and compositionally (both trace and major elements) mimic the plagioclase phenocrysts of basalt erupted 6 km away at the onset of ...
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(2000)The low-pressure eutectic for the coprecipitation of calcite, portlandite, and periclase/brucite (with H2O-rich vapor) has served as a model for the existence and crystallization of carbonatite magmas. Attempts to determine ...
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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 ...
Now showing items 2168-2187 of 39124