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Browsing ELibrary by Title
Now showing items 5600-5619 of 21934
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(1999)Mineralogical, chemical and O-isotopic analyses were performed on the clay matrices surrounding two natural fission reactors of the Oklo deposit. In the deeply preserved reactor 10 (450 m), clays are composed of hydrothermal ...
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(2004)At the Nakdong As-Bi deposits, South Korea, Cambro-Ordovician sedimentary sequences are cut by numerous dykes of quartz monzodiorite and porphyritic granite. In the deposit, stage I involves arsenic mineralization, chiefly ...
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(1994)Thermally driven convection of seawater occurs through oceanic crust of all ages, at the seafloor spreading axis, on mid-ocean ridge flanks, and in the ocean basins. At the ridge axis and on the flanks, circulating seawater ...
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(2000)A hydrothermal diamond anvil cell (HDAC) has been modified by drilling holes with a laser to within 150 μm of the anvil face to minimize the loss of X-rays due to absorption and scatter by diamond. This modification enables ...
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(1988)The contradiction between the relatively low regional heat flow observed in the Baikal rift area and the absence of anomalously heated matter at the Mohorovicic discontinuity was previously explained in terms of the ...
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(1998)Carbonaceous chondrites contain Ca-Al-rich inclusions (CAIs) which consist mainly of refractory minerals including gehlenite, spinel, perovskite, and hibonite which are predicted to be the first phases formed from early ...
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(2000)Metakaolins formed by total dehydroxylation of kaolinite, dickite and nacrite were hydrothermally treated at 240°C, for 2, 21 or 182 days, at initial pH = 5-6 or 1. Kaolinite was the only mineral of the kaolin subgroup ...
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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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(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 ...
Now showing items 5600-5619 of 21934