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Now showing items 16105-16124 of 39126
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(2004)We outline an efficient integrated wavelet, a spectral, and a cross-spectral approach for the time-series analysis of geologic data. Here these techniques are applied to a database of 154 large igneous provinces (LIPs) in ...
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TIMESCALES DETERMINING THE DEGREE OF KINETIC ISOTOPE FRACTIONATION BY EVAPORATION AND CONDENSATION (2004)A first order characteristic of the relative abundance of the elements in solar system materials ranging in size from inclusions in primitive meteorites to planetary sized objects such as the Earth and the Moon is that ...
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(2003)The Puutsaari intrusion is a potassium-rich magmatic complex in the eastern part of the Svecofennian domain close to the Archaean border. The intrusion is generally undeformed in contrast to 1880–1875 Ma-old country rock ...
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(2002)Growing evidence suggests that the mechanism of Palaeozoic continental growth in Central Asia was by subduction – accretion with punctuated collisions that produced ophiolitic sutures between accreted blocks. The Bayankhongor ...
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TIMING OF EARLY PROTEROZOIC MAGMATISM ALONG THE SOUTHERN MARGIN OF THE SIBERIAN CRATON (KITOY AREA) (2004)Several granites and basement gneisses along the southern margin of the Siberian Craton were sampled to obtain precise age constrains and compositional isotopic data. The analysed granite plutons are interpreted to have ...
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(2003)Four types of accessory zircons with U-Pb ages of 2452 ± 7, 2417 ± 3, 1943 ± 3, and 1906 ± 4 Ma were detected in the polymetamorphic rocks of the anorthosite association from the Pyrshin and Abvar massifs of the Lapland ...
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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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(2020-01-01)We review the current knowledge about Southeast Asian volcanoes and their eruption histories, and focus on identifying tephrochronologic markers representing major explosive eruptions in order to further future palaeoclimate ...
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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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(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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(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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(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 ...
Now showing items 16105-16124 of 39126