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Browsing Геология России by Title
Now showing items 5960-5979 of 39126
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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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(2017-04)The Klyuchevskaya group of volcanoes (KGV) located in the northern part of Kamchatka has the highest magma production rate for any arc worldwide and several of its volcanoes have been studied in considerable detail [e.g. ...
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(PANGAEA, 2007-09-29)Middle Cenozoic evolution of magmatism in the Schmidt Peninsula between 37 and 25 Ma began with eruptions of subalkaline and moderately alkaline andesite, latite, trachyandesite, and trachyrhyolite lavas and ended with ...
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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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(IOP Publishing, 2016)Geochemical specifics of lake water of the Kulunda Steppe territory (Altay region, Russia) are studied. The results show that in the territory mainly chloride and less soda lakes with sodium compound are developed. It is ...
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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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(PANGAEA, 2000-02-03)
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(Cambridge University Press, 1983)
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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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Geochemical groundwater peculiarities of Paleogene sediments in S-E Western Siberia artesian basin (IOP Publishing, 2016)The geochemical peculiarities of groundwater in Paleogene deposits in southeastern part of Western Siberia artesian basin are considered in the paper. Landscape, climate, geostructural and hydrogeological conditions define ...
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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. ...
Now showing items 5960-5979 of 39126