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Browsing ELibrary by Title
Now showing items 4782-4801 of 21253
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(2003)The ore mineralization at the Vernyi gold deposit in the Baikal-Patom area, eastern Siberia, was produced in two stages (metamorphic hydrothermal sulfide and quartz-vein stages). The compositions of the host and metasomatic ...
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(1988)To obtain more complete petrological information, we thoroughly studied volcanic rocks of the Sovetskaya Gavan complex in the Koppi River basin on the Sovetskaya Gaan' Plateau and along upper reaches of the Samarga River ...
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(1987)The authors investigated spheroidal rhyolite samples from the Paren' volcanic field in the Evensk zone of the Okhotsk-Chukotka belt. The Upper Cretaceous volcanic sequence here is dominated by latite-andesite and andesite-basalt ...
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(1996)This is a study of the effect of solidifying a magma body by partial crystallization of a series of small packets of liquid, mixing the residual liquid into the main body of liquid before repeating the process. It confirms ...
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(1995)Eleven Icelandic hyaloclastites altered in freshwater have been studied. The weathering of basaltic glass, which is their primary constituent, leads to precipitation of clayey and possibly zeolitic phases. The dissolution ...
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GEOCHEMICAL FACIES ANALYSIS OF FINE-GRAINED SILICICLASTICS USING TH/U, ZR/RB AND (ZR+RB)/SR RATIOS (2001)Abundance of the trace elements Zr, Rb, Sr, Th and U may provide insight into the sedimentological origin of fine-grained siliciclastic sediments, provided that the units are derived from similar source areas, as demonstrated ...
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(1988)Basalts of intracontinental rift zones mostly belong to the subalkalic or alkalic series and only rarely to the normal series. A characteristic feature of rift basalt is not only the relatively high total alkalinity, but ...
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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 ...
Now showing items 4782-4801 of 21253