Browsing ELibrary by Subject "calcite"
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Browsing ELibrary by Subject "calcite"
Now showing items 1-14 of 14
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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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(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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(2004)Schoepite. [(UO2)(8)O-2(OH)(12)](H2O)(12), precipitates through interaction of acidic and basic uranyl solutions with calcite. The uranyl solutions have (UO2)(2+) concentrations between 1.5 and 50 mmol L-1, and initial pH ...
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(2003)Samples from the Kola Superdeep Drillhole (12 262 m), a deep drillhole (1060 m), and from the surface, seaprated by only around 10 km, provided a unique opportunity for direct tracing of delta13C and delta18O changes through ...
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(2003)Samples from the Kola Superdeep Drillhole (12 262 m), a deep drillhole (1060 m), and from the surface, seaprated by only around 10 km, provided a unique opportunity for direct tracing of delta(13)C and delta(18)O changes ...
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(2004)Pedogenic goethites in each of two Early Permian paleosols appear to record mixing of two isotopically distinct CO2 components—atmospheric CO2 and CO2 from in situ oxidation of organic matter. The δ13C values measured for ...
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(2004)Interaction of concentrated acidic uranyl-bearing solutions at initial values of pH of 2.5 and 4.5 with calcite at 25°C in an open system results in formation of schoepite, becquerelite and wyartite-II. Interaction of ...
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(2004)The influence of grinding on colour and particle-size properties of talc and smectite from a white bentonite were studied and compared with a fine-grained calcite from a chalk. Grinding decreased the grain size of all three ...
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(2005)This experimental study presents in situ measurements of step migration rates for layer growth of calcite at various levels of superaturation and fluid Sr concentrations. Our results show that Sr has complex behavior as ...
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(2004)Mg-bearing calcite was precipitated at 25°C in closed system free-drift experiments from solutions containing NaHCO3, CaCl2 and MgCl2. The chemical and isotope composition of the solution and precipitate were investigated ...
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(2002)Sr concentrations in Phanerozoic biological calcite suggest a close link between fluctuations in the Sr/Ca ratio of seawater, aragonite versus calcite sedimentation, and the Mg/Ca ratio of seawater, the entire chain being ...
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(2004)Calcium isotopic variations in carbonates, both marine organisms and inorganic systems, have recently been interpreted as a possible seawater temperature recorder [1,2]. In order to understand the behavior of calcium ...
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(2003)The reaction kinetics and fluid expulsion during the decarbonation reaction of calcite+quartz=wollastonite+CO2 in water-absent conditions were experimentally investigated using a Paterson-type gas apparatus. Starting ...
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(2003)The solubility of calcite in H2O was measured at 6-16 kbar, 500-800 °C, using a piston-cylinder apparatus. The solubility was determined by the weight loss of a single crystal and by direct analysis of the quench fluid. ...
Now showing items 1-14 of 14