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Now showing items 8712-8731 of 43478
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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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(2006)Several hydrothermal sulfide structures were sampled using Mir manned submersibles in the relatively shallow Lucky Strike vent field, Mid-Atlantic Ridge; the bathymetric position of these structures varies by approximately ...
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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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(2006)Mg-rich kaolinite and Mg+Ni-rich kaolinite have been synthesized in hydrothermal experiments (200 and 400°C) from poorly crystalline kaolinite and Mg- and Mg+Ni-bearing solutions. Al-rich serpentine and Al-rich chlorite ...
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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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(2006)Results of the first detailed study of mineral and chemical compositions in the rift zone of Iceland near the town of Hveragerdi are presented. The major clayey components represented by dioctahedral smectites (mainly, ...
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(2006)The main elements and hydroxyl within garnets of eclogites from the west Tianshan were examined using electron microprobe at Fourier infrared spectroscopy. As a result, the garnets show zoning composition: that is spessartite ...
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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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(2006)Arc volcanoes are typically located 90-180 km above the surface of downgoing slabs, as shown by Wadati-Benioff deep seismic foci. The intimate relationship between the dip angles of the subducting slab and the locations ...
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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 ...
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(1999)We test the hypothesis that a versatile strain of iron bacteria, Geobacter metallireducens, can metabolize Fe(III) when it is complexed to hydroxamate ligands. Pure cultures were grown under anaerobic conditions with, and ...
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(1998)A suite of more than 200 garnet single crystals, extracted from 150 xenoliths, covering the whole range of types of garnet parageneses in mantle xenoliths so far known from kimberlites of the Siberian platform and collected ...
Now showing items 8712-8731 of 43478