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Browsing ELibrary by Title
Now showing items 9326-9345 of 21936
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(2003)We have discovered almost unaltered porphyric alkaline-ultrabasic potassic rocks in the central Tomtor Massif and have first carried out an X-ray microanalysis of the hosted minerals (phlogopite, leucite, clinopyroxene, ...
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(1993)Deposits of the “porphyry” family (essentially porphyry copper and gold-porphyry copper, gold-bearing porphyry molybdenum-copper, gold-containing porphyry copper-molybdenum and porphyry molybdenum deposits) are associated ...
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(2003)A comprehensive analysis of paleomagnetic records, nannofossils, mammal fauna, and fission- track dating results was conducted for the Upper Miocene sediments of the Eastern Paratethys. The age of Pontian boundaries in the ...
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(1988)Intermontane basins with high ore potential, formed during Mesozoic-Cenozoic tectonomagmatic regeneration, constitute a broad belt in central Asia between the Siberian and the Chinese-Korean cratons, extending from the Sea ...
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(1989)Recent reports of relatively high concentrations of rare-earth elements in hot springs on the East Pacific Rise and their accumulation in metalliferous sediments are stimulating investigations of rare-earth mineralization ...
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(2004)New helium isotope data (He-3/He-4) from a series of co-genetic Siberian lavas of Cenozoic age (0.6 - 3 Ma) provide possible evidence for mass-dependent helium isotope fractionation. These lavas, erupted around the Baikal ...
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(1989)The structure of the lower mantle (at depths greater than 1000 km) is still undetermined. The question arises whether the cotunite-like phase is the only stable phase in the lower mantle. It is quite possible, but additional ...
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(1989)In recent decades, underground miners of ore minerals and solid nonore minerals both in this country and abroad have increasingly encountered natural gas pockets and dynamic manifestations of rock pressure such as gas and ...
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(1989)Recent investigations have shown that gold has a relatively high migration ability in the supergene zone. Under exogene conditions it is very mobile in both acid and alkaline media and not only can become dispersed, but ...
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(2002)The melting reaction at the solidus of mantle peridotite is commonly peritectic in nature, with liquid and one or more solid phases produced upon melting. In some situations, one of the phases participating on the reactant ...
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(1988)We analyze the average size distribution of sociopolitical divisions (countries, provinces, states and the like) in the light of the phenomenon of 'dominant' dimensions of the hierarchical block structure of the crust. ...
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(2003)In this work, we review the processes in the Earth's core that influence the Earth's rotation on the decadal time scale. While core-mantle coupling is likely to be responsible for the decadal length-of-day variations, this ...
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(1988)The posthumous phosphatization of the organic part of shells was produced by the mineral component of the shells themselves, that is, there occurred a posthumous redistribution of the calcium phosphate itself, which became ...
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(1988)Aurostibite occurs in many gold-antimony deposits in paragenesis with gold, stibnite, berthierite and antimony oxide, and it sometimes accounts for up to 10% of the total amount of gold in the ores. Electrochemical ...
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(1992)Experiments in the system high-A1 basalt (HAB)-water have been conducted in the melting range at pressures between 1 atm. and 10 kbar, defining the amphibole stability field and the composition of liquids which coexist ...
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(2002)We discuss the orbital evolution of solar system objects that can be sources of Earth-crossing bodies. One of the candidates of the source of Earth crossers is a group of high-inclination asteroids within the main asteroid ...
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(2003)The uranium deposits of the Late Jurassic Streltsovka caldera (Transbaikalia, Russia) represent the largest uranium field associated with volcanics in the world (280,000 t U) and Russia's largest uranium resources. About ...
Now showing items 9326-9345 of 21936