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Browsing ELibrary by Title
Now showing items 4796-4815 of 21701
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(2004)This article considers the parageneses of microelements in oil fields, which are largely represented by the following metals: Ni, Cu, Cr, Pt, Pd, Ru, Rh, and Ir. Samples were taken from 46 oil fields localized in Riphean ...
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(2003)The first geochemical data for tuffisites, potassic alkaline rocks of specific facies that might contribute to the elevated diamond potential of the region, are presented. The tuffisites are completely argillized, and their ...
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(1988)The concept of geochemical field structure was developed in modeling of the geochemical fields of ore-bearing structures at various hierarchical levels, from ore shoots to ore zones. The structure-producing elements in a ...
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(2003)To reveal chemical fractionation during porcellanitization, we have examined chemical compositions of porcellanite clasts and their host sediments from DSDP sites 164 and 166. Porcellanite is an intermediate product during ...
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(2004)Geochemical heterogeneity in the mantle beneath the Central Asian mobile belt was considered for the Tien Shan and Baikal-Mongolian regions. The depletion of ultramafic material and the supply of deep-seated fluids (melts) ...
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(2004)Newly obtained data (ICP-MS, XRF, and atomic absorption analyses) are reported for a broad spectrum of REE in xenoliths of metabasite granulites (mafic crystalline schists), charnockites, and metapyroxenites from the ...
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(2003)Several trends in the early history of the Earth (decrease in the radiogenic heat and volcanic activity; growth of continents, which were mineral traps; changes in the composition of objects of weathering and erosion; drop ...
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(2001)An X-ray fluorescent analysis with synchrotron radiation (SR-XFA).and neutron-activation analysis (INAA) were used to interpret high-resolution geochemical records of paleoclimate signals in bottom sediments of Lake Baikal. ...
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(1997)Research was carried out into the fractionation of carbazoles in oils in connection with the hypothesis that the composition of carbazoles in oils is very sensitive to the process of migration. The original composition of ...
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(1987)Iodine, bromine, and chlorine concentrations were determined in different Antarctic meteorite specimens (eucrites, high-iron and low-iron chondrites) with isotope dilution mass spectrometry. In all Antarctic meteorites ...
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(2002)This article reviews data on the geological structure and chemical compositions of the main rock varieties and typomorphic minerals (muscovites and wolframites) at the Spokoininsk greisen tungsten deposit. The fluid regime ...
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(2005)New data returned from the Mars Exploration Rover (MER) mission have revealed abundant evaporites in the sedimentary record at Meridiani Planum. A working hypothesis for Meridiani evaporite formation involves the evaporation ...
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(2005)The EQ3/6 software package, version 7.2 was successfully used to model scrubbing of magmatic gas by pure water at 0.1 MPa, in the liquid and liquid-plus-gas regions. Some post-calculations were necessary to account for gas ...
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(2001)In order to evaluate the mechanism of production of unusual high-Mg andesite (HMA) magmas, Pb–Nd–Sr isotopic compositions were determined for HMAs and basalts from the Miocene Setouchi volcanic belt in the SW Japan arc. ...
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(2004)In a series of water-rock reaction simulations, we assess the processes of serpentinization of harzburgite and related calcium metasomatism resulting in rodingite-type alteration, and seafloor carbonate chimney precipitation. ...
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GEOCHEMICAL PROCESSES AND SOLUTE TRANSPORT AT THE SEAWATER/FRESHWATER INTERFACE OF A SANDY AQUIFER (2005)Geochemical processes occurring at a seawater/freshwater interface were studied in a shallow coastal siliclastic aquifer containing minor amounts of calcite. Data were collected from 106 piezometers in a 120-m transect ...
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(2003)This study investigated possible geochemical reactions during titration of a contaminated groundwater with a low pH but high concentrations of aluminum, calcium, magnesium, manganese, and trace contaminant metals/radionuclides ...
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(2001)Recent theories have proposed that life arose from primitive hydrothermal environments employing chemical reactions analogous to the reductive citrate cycle (RCC) as the primary pathway for carbon fixation. This chemistry ...
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(2004)We conducted a geochemical study of eclogites (40 samples) from a boudin of the Lower Unit of the Maksyutov Complex in the South Urals in order to determine their protolith nature. The eclogites have major element compositions ...
Now showing items 4796-4815 of 21701