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Browsing ELibrary by Title
Now showing items 9292-9311 of 26297
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(2002)The first natural occurrence of metal-troilite-magnetite assemblage composed of Fe-Ni metal and magnetite dendrites and a groundmass of troilite was identified in the shock veins of the Sixiangkou L6 chondrite, which contain ...
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(2000)We report new measurements of metal/silicate partition coefficients for Ga, Cu, and Sn at 10 to 90 kb and 1250 to 1900°C. We show that all three of these siderophile elements (D(metal/silicate) > 10) become more lithophile ...
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(2002)The downturn in mining activity experienced during the 1990s did not preclude significant new developments in various areas of mining geophysics. The methodology for acquiring and compiling data has kept pace with the ...
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(2006)The Triassic cherty formation of Sikhote Alin hosts metalliferous deposits. They are commonly represented by siliceous–rhodochrosite rocks and their metamorphosed analogues (primarily, consisting of Mn-silicates and ...
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(2004)The transition metals are largely siderophile elements. They became concentrated mainly in the liquid Ni-Fe core during the primary layering of the Earth, so that its primary silicate shell was sterile with respect to the ...
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(1997)Metallogenic patterns in convergent margin arcs are related to thickness of the arc crust and its petrologic evolution, which are themselves linked by a positive correlation between average silica content of arc rocks and ...
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(2003)The Central Asian Orogenic Belt (CAOB) is one of the most important regions for Cu, Au and polymetallic and rare metallic (Li, Be, Nb, Ta) mineralization over the world. Most of the ore deposits in the CAOB are closely ...
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(2002)The article reviews metallogeny of the main development stages of the Devonian volcanoplutonic belt in Central Kazakhstan and relations of the metallogeny to magmatism and geodynamic environment. Gold quartz-vein or ...
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(1990)There is one type of ore-forming process undeservedly neglected by most metallogenists. This process is cryolithogenesis, which can be defined as the aggregate of thermophysical, physicomechanical and physicochemical ...
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(1999)The specific features of the Central-Asian orogenic belt (CAOB) and marginal structures of the North-Asian craton are considered on the basis of analysis of lithospheric-plate tectonics and terrain analysis. The general ...
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(2006)The Mont-de-l’Aigle deposit is located in the northern part of Dome Lemieux, in the Connecticut Valley-Gaspé Synclinorium, Gaspé Peninsula, Québec. The Dome Lemieux is a subcircular antiform of Siluro–Devonian sedimentary ...
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(2003)On the basis of the analysis of geological-geophysical materials in the Pribrezhnaya structural-lithologic zone, intrusive dome structures containing Late Cretaceous intrusive massif were identified. They incorporate ore ...
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(2006)An improved computer simulation program has been developed and used to re-measure the metallographic cooling rates of the IIIAB irons, the largest iron meteorite chemical group. The formation of this chemical group is ...
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(2006)Average concentrations of Pb, Zn, Cu, and other metals, as well as S and As, were calculated for the Aue granitic cupola, the contact aureole of which hosts the large vein-type uranium deposit of Schlema-Alberoda and the ...
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(2006)Mica schists of the Korva Tundra Group (~1.91 Ga) of the Tana Belt were buried at the middle crustal level and later exhumed simultaneously with granulites of the Lapland Complex (~1.91 Ga). The Kandalaksha Group (KG) is ...
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(2001)Annealing of the radiation damage generated in α-decay events is a common phenomenon in natural zircons. We have studied relationships between radiation damage, age and radionuclide content of natural zircons on a micro-scale. ...
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(2003)The Hwacheon granulite complex (HGC), occupying the northeastern margin of the Gyeonggi massif, consists mainly of garnetferous leucocratic gneiss and leucogranite together with minor kyanite-garnet gneiss, aluminous gneiss, ...
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(2006)The petrology, mineral paragenese and microstructure suggest that the protoliths for the Chenxing metabasite massif in Tunchang area, Hainan Island probably are composed of gabbroic rocks (coarse-grained amphibolites), ...
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(2002)Most circum-Pacific subduction zones at 100–250 km depth contain layers in which seismic velocities are ca. 5% slower than in the adjacent mantle. We compute seismic velocities from thermodynamic data for equilibrium ...
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(1997)The concept of metamorphic core complexes is applied for the first time to explain the nature of granite gneiss domes in Transbaikalia instead of the commonly used idea of their formation during granitization. Analysis of ...
Now showing items 9292-9311 of 26297