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Now showing items 7005-7024 of 39124
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(2000)In situ energy-dispersive X-ray diffraction (XRD) techniques have been employed to study the hydrothermal formation of crystalline tobermorite and xonotlite. Alkoxide gels of tobermorite composition with varying aluminium ...
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(PANGAEA, 2001-06-29)Data on hydrothermal activity in the Deryugin Basin (Sea of Okhotsk) are reviewed. Barites and carbonates found in sediment cores sampled at feet of hydrothermal mounds were subdivided into recycled and authigenic types. ...
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(1998)The difficulty in measuring reservoir gas concentrations in geothermal systems often forces the use of gas ratios in a separated vapor phase to investigate reservoir conditions.Measured CO/CO2 and H2/H2O ratios of fumarolic ...
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(2002)The Rodnikovoe gold deposit situated in a presently active hydrothermal system located north of the Mutnovsko-Asachinskaya geothermal area in southern Kamchatka, Far Eastern Russia, consists of typical low-sulfidation ...
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(1998)Various sources for hydrothermal CH4 have been proposed over the years. While C isotope studies have narrowed the possibilities, enough higher hydrocarbon gas data now exist both to supplement the isotopic data and to ...
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(1990)Although olivine is commonly formed in metamorphic and metasomatic processes, cases of its crystallization from hydrothermal solutions are extremely rare. In these cases the hydrothermal nature of the olivine is inferred ...
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(1989)In rock samples recovered during the 5th cruise of the R/V Akademik Boris Petrov in 1986 at one of the dredging sites, we found a new type of ore mineralization hitherto unreported for oceanic regions. Because of the keen ...
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(2004)Poorly ordered 2-line ferrihydrite deposits from the caldera of Axial Volcano, a site of hydrothermal vent activity along the Juan de Fuca Ridge, are characterized by an abundance of bacterial structures resembling Gallionella ...
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(2001)The short-range order of a set of Lu-saturated smectites, modified by hydrothermal treatment at 400 °C, which give rise to a new crystalline phase (Lu2Si2O7), has been analyzed. In particular, the modifications undergone ...
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(1996)The aqueous solubility of natural rhodochrosite (MnCO3) has been studied as a function of pH and total dissolved carbonate concentration, from 25 to 275°C and at saturation pressures. At 25 and 90oC the solubility measurements ...
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(1995)To obtain Cu-kaolinites with a controlled range of chemical compositions, syntheses were performed by hydrothermally ageing gels with kaolinite stoichiometric compositions. Gels were prepared with sodium metasilicate and ...
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(1994)This study presents further evidence that amino acids can be synthesized rapidly in hydrothermal solutions from reactants that may have been present in primitive environments. Aqueous NH 4 HCO 3 solutions were reacted with ...
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(1998)Synthetic gel and glass of illitic composition, natural kaolinite, and mixed-layer illitesmectite were used as starting materials for hydrothermal synthesis of ammonium illite. Ammonium illite was prepared from synthetic ...
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(2003)Hydrothermal experiments to synthesize pumpellyite group minerals of the pumpellyite-okhotskite series and to investigate their stability have been carried out at 200, 300 and 400 MPa Pfluid and 250-500 °C by using cold-seal ...
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(2001)To investigate the aqueous species important for transport of rhenium under subcritical conditions, we conducted a series of solubility experiments from 100 degrees to 200 degreesC at vapor saturation pressures. In these ...
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(1998)Compelling evidence now exists for the formation of Archean lode-gold deposits over a substantial range in metamorphic conditions and crustal depth. The commonality of ore-fluid isotopic and geochemical characteristics, ...
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(2002)An olivine grain from a peridotite nodule 9206 (Udachnaya kimberlite, Siberia) was investigated by TEM methods including AEM, HRTEM, SAED and EELS techniques. A previous study of the 9206 olivine sample revealed OH absorption ...
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(2003)The alteration products of cholesterol subjected to hydrothermal conditions have been analyzed by gas chromatography-mass spectrometry. Four sets of experiments were conducted at temperatures ranging between 150 and 300 ...
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(2000)The hydrous species geospeedometer is based on the homogeneous interconversion reaction between molecular H2O species and OH species in silicate melts and glasses. Here we report new data for the calibration of the ...
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(1996)The rate of goethite dissolution in the presence of acetohydroxamic acid, chosen to be representative of hydroxamate siderophores, was examined in order to understand the cycling of iron in soils. The surface chemistry is ...
Now showing items 7005-7024 of 39124