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Browsing ELibrary by Title
Now showing items 6230-6249 of 26297
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(2004)According to the model proposed for the genesis of Pb-Zn stratiform ore mineralization in carbonate strata, (a) ore-forming elements disseminated in carbonate rocks or contained in them in low concentrations are extracted ...
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(2003)Our study of magmatic rocks provides grounds for discussing the successive phases and geodynamic conditions of continental crust generation between 3.2-2.83 Ga within the Fennoscandian shield. Three tectono-magmatic phases, ...
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(2002)The giant Mn ore deposits of the Paratethys are located on the slopes and/or margins of deep basins. The Eocene ocean and associated basins were strongly influenced by large-scale submarine hydrothermal activity which ...
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(2002)Genesis of the Nyurundukan ultramafic-Mafic pluton, Baikal mountain land was discussed. The massif was determined to consist of three intrusive phases, each of which was accompanied dike rocks. The results demonstrated ...
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(2006)The ~260 Ma-old Baimazhai Ni-Cu-(PGE) sulfide deposit in the Jinping region, Yunnan, SW China, is hosted in a small mafic-ultramafic intrusion, which intruded Ordovician sandstone and slate. The intrusion is concentric ...
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(2006)Numerous dykes of ultramafic lamprophyre (aillikite, mela-aillikite, damtjernite) and subordinate dolomite-bearing carbonatite with U-Pb perovskite emplacement ages of ~590-555 Ma occur in the vicinity of Aillik Bay, coastal ...
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(1989)In the cratonic basin that was studied by us, which inherited the structure of the Devonian rift trough, the Lower Carboniferous gray coal measures and overlying Lower and Middle Carboniferous carbonate and clastic deposits ...
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(2001)A new approach for inverting several geophysical parameters at the same time from altimeter and marine data by implementing genetic algorithms (GAs) is presented. These original techniques of optimization based on ...
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(1998)Selected warm and cold water strains of the coccolithophorid Emiliania huxleyi and the closely related species Gephyrocapsa oceanica were cultured under controlled temperature conditions to assess genetic and physiological ...
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(1995)From molecular and isotopic data obtained with a new separation technique, and from published data, it is possible to discuss the relative importance of genetic and post-genetic molecular and isotopic fractionations affecting ...
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(2006)Genetic aspects of the generation of oil alkanes suggest that the genesis of oils is controlled by a succession of factors of a single genetic chain, which indicate that the possible sources of oils are certain inorganic ...
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(2002)The most typical features on the octahedral faces and rhombic dodecahedroidal surfaces of natural diamonds from kimberlites are described. The surface features are classified into three groups by their coexistence on the ...
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(2006)The carbonaceous substances confined to both igneous and terrigenous rocks are widespread in the Minusa intermontane trough of the Altai–Sayan region. The characteristics of bitumen from this region obtained with methods ...
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(2004)Two genetic families of "ancient" oils, the main currently prospected resources, are known on the Siberian Platform. The available information on organic geochemistry of naphthide deposits and syngenetically bituminized ...
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(1989)We studied pyritic copper sulfide deposits of the Central Urals, located in a highly deformed volcanic sequence. The deposits here are known to be confined to steeply dipping meridional zones of dynamically metamorphosed ...
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(1988)In an earlier paper we have derived the methodology for the use of observational and theoretical data on the intralattice distribution of oxygen isotopes in order to solve specific genetic problems in the geochemistry of ...
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(2002)A reconnaissance study on trace elements in metamorphic and hydrothermal quartz was carried out using quartz samples from the tin district Erzgebirge, Germany, the gold mineralization at Kašperské Hory, Czech Republic, and ...
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(1990)Clayton and others have made systematic determinations of the isotopic composition of meteorite minerals, opening the way for a genetic interpretation. The predominant minerals in meteorites are pyroxenes and olivines; we ...
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(1999)Hydrocarbon compositions and their carbon isotopic data for 94 natural gas samples were combined with the results of thermal simulation experiments to complete a comprehensive study of maturity, genetic types and sources ...
Now showing items 6230-6249 of 26297