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Browsing ELibrary by Title
Now showing items 14089-14108 of 22924
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(2004)Main temporal boundaries of the formation history of the Dukat silver deposit have been dated by the Rb-Sr method. The age of ore-hosting high-potassic rhyolites of the Askol'din suite was determined at 199 Ma; the age of ...
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(2004)The isotopic thermochronological study included the U-Pb (SHRIMP) and fission-track dating of zircon and fission-track and (U-Th)-He dating of apatite from syenite intrusions cropping out in the eastern slope of the Sredinnyi ...
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(2001)The most profound biotic crisis in the Earth’s history, causing the near extinction of both terrestrial and marine life, occurred at the end of the Permian period about 253 Myr ago and marks the Paleozoic–Mesozoic era ...
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(1987)Tin-ore deposits are localized in the northeastern USSR within Mesozoic clastic rocks of the Verkhoyansk-Chukotka fold zone and partly within Palezoic carbonate rocks in marginal horst anticlinoria of the Kolyma median ...
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(2006)Titanium is one of many trace elements to substitute for silicon in the mineral quartz. Here, we describe the temperature dependence of that substitution, in the form of a new geothermometer. To calibrate the “TitaniQ” ...
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(2001)U–Pb isotopic dating has been carried out on titanites and rutiles from the Karelian Protocraton, the Belomorian Mobile Belt and the intervening junction zone. These are some of the principal Archaean crustal units in the ...
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(2006)A series of Ti-doped diopside samples synthesized by fluxgrowth methods under reducing conditions were investigated by microanalytical methods and optical absorption spectroscopy, to assess Ti incorporation mechanisms, ...
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(1988)There could be isomorphism between titanium and tin in minerals of the series from malayaite, CaSnO[SiO4], to sphene, CaTiO[SiO4], because they are isostructural. Published analyses of malayaite from 10 deposits revealed ...
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(1993)Titanium is a dispersed lithophile element commonly regarded as chemically immobile at sub-magmatic temperatures. However, a growing number of field studies demonstrate that Ti is somewhat mobile in certain environments. ...
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(2003)Exsolution microstructures including ilmenite±garnet in clinopyroxene and rutile in garnet are common in clinopyroxenite and eclogite from the Sulu ultrahigh-pressure (UHP) terrane. In order to understand the phase relations ...
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(1990)Basalts are the most common volcanic rocks. The way in which their composition is related to types of geological structure in which they occur is a subject of great interest both for the theory of present-day endogenous ...
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(2004)Lithofacies analyses and paleogeographic reconstructions of the middle Sarmatian sequence in the central Ciscaucasus, which hosts the most promising titanium–zirconium placers of the Stavropol region, indicate that ore ...
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(2003)Eleven species and subspecies of the genus Punctaptychus Trauth, 1927 and a new genus, Tauriaptychus, from the Tithonian-Berriasian, Valanginian, and Hauterivian of the Mountainous Crimea are described: P. punctatus ...
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(2006)Despite great practical achievements, sequence stratigraphy failed to elaborate until now the reliable technique for establishing relative sea-level fluctuations (RSLF). The method proposed recently by Yu.A. Volozh with ...
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(2001)Phenomenon of deformed rock mass destruction has been considered. Mathematical models of rock mass destruction have been discussed. It has been shown that system of differential equations of hyperbolic type describes rock ...
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(2001)Problems of destruction of deformable media have been solved. Mathematical models have been used during solving the problems. Differential equations of hyperbolic type have been applied in the models. The case of rock mass ...
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(2002)Recent data on the Lower Devonian biostratigraphy in the studied regions are generalized. The described terrigenous and carbonate reference sections yield sharply different faunal assemblages. Carbonate sections of Mongolia, ...
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(2003)The suggested hypothesis is in sympathy with the new concept of astronomical theory of paleoclimate (Bol'shakov and Bol'shakov, 1999) that implies a greater climatic impact of eccentricity fluctuations than it follows from ...
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(2006)Stratigraphic position of the Oligocene-Miocene (Paleogene-Neogene) boundary in the northern Caucasus and, in this connection, of the Alkun Formation and the Caucasian regional stage in geological sections of Maikop deposits, ...
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(2003)The study of Jurassic gastropods from Central Russia revealed three genera met for the first time in the region under discussion, i.e., Teutonica Schröder, 1995, Longaevicerithium gen. nov., and Novoselkella gen. nov. The ...
Now showing items 14089-14108 of 22924