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Now showing items 13962-13981 of 39381
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(2001)In this article, we report on the results of the investigation of trace and major element contents and compositions of minerals for the representative collection of subalkaline picritic basalts from the Putorana plateau ...
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(2001)We report data for melt and fluid inclusions from phenocrysts of subalkaline picritic basalts and tholeiitic plateau basalts from the Putorana plateau, Siberian trap province. Analyses of reheated melt inclusions from the ...
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(2002)We present an analytical solution and numerical tests of the epidemic-type aftershock (ETAS) model for aftershocks, which describes foreshocks, aftershocks, and main shocks on the same footing. In this model, each earthquake ...
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(2003)Cylindrical samples of water-saturated, initially loose, St. Peter quartz sand were consolidated using triaxial deformation apparatus at room temperature, constant fluid pressure (12.5 MPa), and elevated confining pressures ...
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(1998)Upper Eocene, Oligocene, and lower Miocene units were distinguished in the Lower Cenozoic Machigar and Tumi formations of the Schmidt Peninsula, northern Sakhalin, using distribution patterns of 77 mollusk species. A ...
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(2001)The isotope geochemistry of ocean island basalts has been used to infer the presence of ancient recycled oceanic crust in the mantle. The helium isotopic ratios of basalts from HIMU sources, having high U/Pb (μ) and low ...
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(1996)The mechanism by which high-pressure metamorphosed continental material is emplaced at high structural levels is a major unsolved problem of collisional orogenesis. We suggest that the emplacement results from partial ...
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(1989)One of the important problems in studying island-arc igneous activity is that of its sources. A key problem is that of demonstrating subduction of an oceanic plate beneath an island arc and the involvement of its component ...
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(2005)Solar-type helium (He) and neon (Ne) in the Earths mantle were suggested to be the result of solar-wind loaded extraterrestrial dust that accumulated in deep-sea sediments and was subducted into the Earths mantle. To obtain ...
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(1990)Oceanic plate subduction under continental one took place as a result increase of lithospheric kinetic energy by value of order 1027 erg/year (because of the Earth rotation acceleration in 1978–1981) that caused response ...
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(2003)We perform thermo-mechanical laboratory experiments designed to explore the behaviour of the volcanic arc during intra-oceanic arc–continent collision following oceanic subduction and subsequent back-arc opening. The ...
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(2002)The most intense subduction-related anatexis in the Urals occured in the late Early Carboniferous (340-320 Ma). It is characterized by high water saturation (PH2O = 0.7 1.OPtot) of the generated melts, caused by additional ...
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(1998)For the first time, δ13C–δ15N of more than 150 diamonds of known paragenesis, originating from different localities are reported. These coupled δ13C–δ15N determinations argue against a direct formation from subducted ...
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(2003)In the Silurian-Carboniferous (440-330 Ma), the Urals was involved in suprasubduction magmatism. The following subduction-related intrusive magmatites are recognized here: 1. Volcanic, mainly high-level complexes including: ...
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(2003)Reproducibility of Re-Os molybdenite ages depends on sample size and homogeneity, suggesting that Re and Os are decoupled within individual molybdenite crystals and do not remain spatially linked over time. In order to ...
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SUBLACUSTRINE MUD VOLCANOES AND METHANE SEEPS CAUSED BY DISSOCIATION OF GAS HYDRATES IN LAKE BAIKAL (2002)Four lake-floor seeps have been studied in the gas-hydrate area in Lake Baikal's South Basin by using side-scan sonar, detailed bathymetry, measurements of near-bottom water properties, heat-flow measurements, and selected ...
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(2001)Recent studies of turbidite bed thickness distributions have demonstrated power-law as well as log-normal statistical distributions. The different distributions may reflect different fan processes and environments and, ...
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(1990)The temperatures and pressures under which gas hydrates may exist occur in areas with a thick permafrost layer and in most pelagic basins of the ocean. However, hydrates are not found in all zones where such conditions ...
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(PANGAEA, 2010-05-06)High-resolution geophysical and sediment core data are used to investigate the pattern and dynamics of former ice flow in Kvitøya Trough, northwestern Barents Sea. A new swath-bathymetric dataset identifies three types of ...
Now showing items 13962-13981 of 39381