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Now showing items 6945-6964 of 39004
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(2003)The hydrothermal transformation of 2-line ferrihydrite into hematite proceeds slowly if a sufficient quantity of some strongly adsorbing ligand. such as phosphate or citrate, is sorbed on the starting product. In this work, ...
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(1989)Hydromagnetic diagnosis, a method of determining the status of the periterrestrial medium from observations of hydromagnetic fields originating in space, and magnetotelluric sounding of the crust, a method of geological ...
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(2003)Earth's porous crust and the fluids within it are intimately linked through their mechanical effects on each other. This paper presents an overview of such "hydromechanical" coupling and examines current understanding of ...
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(1987)A coastal upwelling is produced by long-shore winds that generate drift currents If the Coriolis force deflects these away from shore, then the ebb flow of surface waters results in an upwelling. The authors use as an ...
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(1999)Measurements in Baikal taken in 1993-97 have revealed some regularities in regime and turnover of silicon in different parts of the lake. Vertical distribution of silicon is controlled by advection of either low-Si (limnic) ...
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(2003)During the past 5 million years significant changes have taken place in the Lake Baikal ecosystem. The climate changed from subtropical, with average annual air temperatures (T air) of 15–10 °C, to a moderate one with T ...
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(2004)The major organic component of carbonaceous chondrites is a solvent-insoluble, high molecular weight macromolecular material that constitutes at least 70% of the total organic content in these meteorites. Analytical pyrolysis ...
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(1992)The model of hydroseismicity relates variations of the hydrological state of the earth's crust to seismicity through the weakening of rocks by fluids and the transfer of stresses from hydrologically affected regions into ...
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(2003)The solubility of chalcocite has been measured over the temperature range 35-95°C at pH 6.5-7.5 in aqueous hydrosulfide solutions in order to determine the stability constants of the Cu(HS)2- complex. A heated flow-through ...
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(2001)Carbonate hydrotalcites (HTls) were prepared by coprecipitation of metal nitrate salts and Na2CO3. The structural features of noncalcined, calcined and reconstructed materials were characterized by XRD, 27Al MAS NMR, AAS ...
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(1998)This paper sums up the results of previous studies of the thermal springs in the Akademii Nauk caldera, and presents the results of investigations on the condition of the springs as at July 1996, namely, a description of ...
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(1995)Compositions of hydrothermal chlorite and fine-grained white mica from the inner and outer alteration halos in the Koongarra U deposit were analyzed by electron microprobe and analytical electron microscopy. Analyses show ...
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(IOP Publishing, 2015)The mapping of the hydrothermal alterations in Urjahskoe and Fedorov-Kedrov gold-ore fields was conducted by applying channel relationship method (band ratio) based on ASTER spectral-zonal satellite image data. It was ...
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HYDROTHERMAL ALTERATION OF ROCKS IN EPITHERMAL DEPOSITS AND IN AREAS OF RECENT HYDROTHERMAL ACTIVITY (2000)In paleovolcanic provinces, metasomatism and mineralization are often found to have developed simultaneously in the same structural settings. The emplacement of ore veins, however, are known to have been controlled by the ...
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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 ...
Now showing items 6945-6964 of 39004