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Now showing items 15605-15624 of 39126
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(1999)The optical absorption spectra of Co2+ and Ni2+ in haplogranitic glass and melt were measured from room temperature to 1500°C. For Co2+, a continuous decrease of the intensity of all bands with increasing temperature is ...
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(1995)First measurements of water species in an aluminosilicate melt of haplogranitic composition at temperatures up to 800°C and at a pressure of 1500 bar determined by in situ near-infrared spectroscopy are presented. These ...
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(1998)The paper summarizes both published and unpublished compositional data of garnets and pyroxenes from eclogitic type (E-type) paragenesis diamonds from Mir and Udachnaya kimberlite pipes (Yakutia). The database includes ...
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(2001)
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(2001)Spicules have been investigated in Late Pliocene core samples from the borehole BDP-96-1. The samples have been dated paleomagnetically. A total of 42 spicule types have been discovered, of which 15 are found in modern ...
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(2004)Isotopic signatures of the lower and upper continental crust and basalts from oceans and continents have been systematically arranged on a plot in the coordinates of Sr-Nd isotope ratios. Both mantle trends of isotopic ...
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(1999)Sr and C isotopic data obtained on stratigraphic suites of well-preserved marine limestone from Siberia, Namibia, Canada, Svalbard and East Greenland provide a relatively detailed first-order record of isotopic variation ...
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(1996)The stability and composition of phengitic muscovite was investigated from 5.5-11 GPa, 700-1150oC in synthesis experiments performed in a multianvil apparatus. Starting materials consisted of natural minerals with a bulk ...
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(2003)The high-pressure stability of antigorite in the systems NISH and MASH was investigated using two structurally and chemically well-constrained natural samples. Careful sample selection and characterization ensured that the ...
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(1997)The solubilities of AgBr(s) in NaBr solutions and AgI(s) in NaI solutions were measured at elevated temperature. Referring to the following general reactions (where X = Cl, Br, or I): AgX(s) ⇋ Ag⁺ + X⁻ (1) AgX(s) ⇋ AgX(aq) ...
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(2001)The solubility of gold in liquid-undersaturated HCl-bearing water vapor was investigated experimentally at temperatures of 300 to 360°C and pressures up to 144 bars. Results of these experiments show that the solubility ...
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THE STABILITY OF HERCYNITE AND HERCYNITE-GAHNITE SPINELS IN CORUNDUM- OR QUARTZ-BEARING ASSEMBLAGES (1989)The equilibrium. 3FeAl2O4 + 3Al2SiO3 = 5 Al2O3 (1)has been calibrated in the piston-cylinder apparatus. Experiments were carried out using well-calibrated NaCl furnace assemblies and Ag80Pd20 capsules with oxygen fugacity ...
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(1999)To investigate the pressure stability limit of phlogopite and the pressure–temperature stability field of its breakdown product K-richterite, experiments were conducted from 4.0 to 9.5 GPa and between 800°C and 1400°C in ...
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(1987)Hydrothermal experiments on natural samples of trachyandesite and dacite bulk composition show that anhydrite (CaSO4) may occur as a stable phenocryst phase at oxygen fugacities greater than or equal to 1.0 to 1.5 log fO2 ...
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(1999)Solubility methods were employed to determine conditional equilibrium constants for the formation of hydroxide and mixed hydroxy-chloride complexes of Pd(II). Measurements were made over a temperature range of 25-85°C, a ...
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(1995)The decomposition rate of thiosulfate (S2O2-3) and the formation rates of its partial decomposition products, sulfite (SO2-3), sulfate (SO2-4), and tetrathionate (S4O2-6), were measured in the absence and presence of pyrite ...
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(1995)The theoretical minimum difference between the δ13C of soil CO2 (a concentration) and soil-respired CO2 (a flux) was previously thought to be 4.4%%. It is shown here that the difference is a function of the δ13C of ...
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(1986)A stage subdivision of the Cambrian System is proposed. In the lower series four stages are distinguished (the Tommotian, Atdabanian, Botomian, Tojohnian); in the middle series, two (the Amga and Maya stages); in the upper ...
Now showing items 15605-15624 of 39126