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Browsing ELibrary by Title
Now showing items 9286-9305 of 21936
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(1996)In analysis of the stratigraphic distribution of planktonic foraminifers in the Pliocene–Lower Quaternary sediments of the North Pacific, and research of the space-time distribution dynamics of 60 species at four levels ...
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(2003)A sample of Pb-rich baksanite was recovered in a magnetite-andradite skarn from the Tyrnyauz W-Mo deposit, in the northern Caucasus, Baksan River valley, Kabardino-Balkaria Republic, Russian Federation. The rock sample ...
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(1998)In an effort to document the source of the parental melts to carbonatites, we have measured rare gases in 380 Ma carbonatites and associated mineral assemblages from the Kola Peninsula, eastern part of the Baltic shield ...
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(2000)A time-space relationship between large igneous provinces (LIPS), present day hot spots, and the fragmentation of Pangea has been documented over several decades, but the cause of fragmentation has remained elusive. LIPS ...
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(1989)The 'porphyrite series' of Georgia consists of basalt, andesite-basalt and andesite lava flows and sheets, pyroclastic units, and comagmatic hypabyssal intrusive bodies, chiefly of the gabbro-dolerite composition. This ...
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PLUTONIC STRUCTURE OF THE SPITSBERGEN MARGINAL PLATEAU IN THE NORTHEASTERN PART OF THE GREENLAND SEA (1989)Plate tectonics suggest that the first stage of rifting in the areas of the Norwegian Sea and of the present southern part of the Greenland Sea, and in the Eurasian deep-sea basin, began about 60 million years and ended ...
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(2002)This paper has three motivations: first, to map Pn and Sn velocities beneath most of Eurasia to reveal information on a length scale relevant to regional tectonics, second, to test recently constructed 3-D mantle models ...
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(2004)The interaction of the Arabian plate with the Eurasian plate has played a major role in building the young mountain belts along the Zagros–Bitlis continent–continent collision zone. Arabia's northward motion is considered ...
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(2002)Cation tracer diffusion coefficients, DMe*, for Me=Fe, Mn, Co and Ti, were measured using radioactive isotopes in the spinel solid solution (TixFe1-x)3-δO4 as a function of the oxygen activity. Experiments were performed ...
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POINT DEFECTS AND CATION TRACER DIFFUSION IN (TIXFE1-X)3-δO4 1. NON-STOICHIOMETRY AND POINT DEFECTS (2002)The deviation from stoichiometry, δ, in spinel solid solutions of the type (TixFe1-x)3-δ O4 with x=0.1, 0.2 and 0.25 was studied thermogravimetrically as a function of oxygen activity, aO2, at 1100, 1200 and 1300 °C. The ...
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(2004)This article outlines the present state of knowledge of paramagnetic defects in crystalline zircon as obtained mainly, but not exclusively, from electron paramagnetic resonance (EPR) studies in crystalline zircon (zirconium ...
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(2001)The pH and ionic strength dependence of light generated at a corundum-solution interface by the nonlinear optical process of second harmonic generation (SHG) is reported. A point of zero salt effect occurs in the pH range ...
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(2001)The dynamic behavior of baroclinic point vortices in two-layer quasigeostrophic flow provides a compact model for studying the transport of heat in a variety of geophysical flows including recent heton models for open ocean ...
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(1991)The study of patterns of eruption occurrence could lead to a better understanding of the physics behind the volcanic process. However, various attempts to find a single statistical distribution that describes the occurrences ...
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(1996)Studying the planetary-dynamic behaviour of the Earth connected with geophysical processes as sources of excitation is of particular importance. In order to make a contribution concerning seasonal influences of near-surface ...
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(2003)Our study focuses on the observed higher-frequency polar motions that are substantially smaller than the Chandler and annual wobbles. Here, the combined Earth orientation series SPACE99 from 1976 to 2000 with one-day ...
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(2002)Perturbations of the Earth's rotation caused by the Quaternary glacial cycles provide an important constraint on the viscosity of the deep mantle because they represent a long-wavelength response of the Earth to surface ...
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(2001)Results are presented from an analysis of the polarization and bispectra of microseisms recorded during a 1-day noise monitoring session conducted at the Borovoe Geophysical Observatory, Kazakhstan. Some information was ...
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POLARIZATION FILTERING FOR AUTOMATIC PICKING OF SEISMIC DATA AND IMPROVED CONVERTED PHASE DETECTION (2001)Data-adaptive polarization filtering is used to improve the detection of converted seismic phases. Both direct waves and mode-converted PS and SP arrivals may be more easily picked on the filtered records. An autopicking ...
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(1990)Investigating the mineral composition of ferromanganese nodules is one of the most important parts of integrated study of these unique objects from the pelagic regions of oceans. The discovery of polianite attracted our ...
Now showing items 9286-9305 of 21936