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Browsing ELibrary by Title
Now showing items 5375-5394 of 21934
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(1999)We analyze 243 three-component broadband digital seismograms of aftershocks from the Ms. = 7.3 Suusamyr, Kyrgyzstan, earthquake to determine seismic attenuation in the northern Tien Shan. Pg, Sg, and SmS body waves and S ...
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(2004)Study of the Khitoostrov, Varatsk, and other corundum occurrences in kyanite-garnet-biotite plagiogneisses of the Chupa section (Belomorian Mobile Belt) has revealed their association with products of low-alkaline Ca-Na ...
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(2004)In the Okhotsk massif specified are two groups of sub-volcanic alkaline rocks (K-picrites and alkaline basaltoids) with separated areas, differing in composition, ratio of mineral phases, petrostructural characteristics. ...
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(1989)That pre-Paleozoic volcanic rocks occur widely in the Polar Urals has been known for a long time. High-magnesium andesites and boninites of the Polar Urals resemble in their geological position, as well as their petrography ...
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(2001)An approximate expression of the eikonal equation and the polarization vector may be obtained in weakly anisotropic media from first-order perturbation theory. The advantage of this approximation for qP wave is that the ...
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(1988)In this article, we give the results of our geologic study of the inhomogeneity in a Pliocene lava flow in the Monkres River basin in the Iya-Uda interfluve in the Eastern Sayan. The flow basalt here is black or dark gray ...
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(2000)We investigated high-precision Pb isotope ratio analysis by multi-collector-inductively coupled plasma-mass spectrometry (MC-ICP-MS) using added thallium as an internal isotopic standard to correct for mass dependent ...
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(2000)We have developed a method for the rapid, in situ measurement of U-Th isotopic compositions at the semimicro scale using laser ablation sampling, combined with multiple collector ICP magnetic sector mass spectrometry ...
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(1999)High precision in situ oxygen isotope analyses of quartz using an ArF laser are described. The high precision is documented by comparing in situ ArF laser data with CO2 laser and conventional analyses of silica and quartz. ...
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(2003)The rock stratigraphic record exists as a rich, albeit complex and incomplete repository of Earth history, tracing the processes of biological evolution, climate change, oceanic and atmo-spheric ...
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(2003)Alpine-type orogenic belts are produced by short-lived subduction of an ocean basin and the underflow of continental crust, resulting in suturing. Old, relatively competent sialic basement and superjacent units characterize ...
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(1992)At pressures higher than ∼22 kbar, near-solidus melts of peridotite + CO2 + H2O are carbonatitic and may be able to separate from their source regions at liquid fractions as low as 0.01%. At such low degrees of partial ...
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(2002)Pressure-induced structural modifications in the zeolite bikitaite are studied by means of in situ synchrotron X-ray powder diffraction and ab initio molecular dynamics. The experimental cell parameters were refined up to ...
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(1999)The high-pressure response of the cell parameters of calcite, CaCO3, has been investigated by single crystal X-ray diffraction. The unit cell parameters have been refined from 0 to 1.435 GPa, and the linear and volume ...
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(2004)Four main serpentine varieties can be distinguished on the basis of their microstructures, i.e. lizardite, antigorite, chrysotile and polygonal serpentine. Among these, antigorite is the variety stable under high pressure. ...
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(2003)The crystal structure of synthetic kosmochlor, NaCrSi2O6, was studied using single crystal X-ray diffraction at high pressure. A four-pin diamond anvil cell, with 4:1 methanol:ethanol pressure me-dium, was used to achieve ...
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(2002)Pressure-induced structural modifications in scolecite were studied by means of in situ synchrotron X-ray powder diffraction and density functional computations. The experimental cell parameters were refined up to 8.5 GPa. ...
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(1999)The room-temperature static compression of magnesite (MgCO 3 ) has been measured by X-ray powder energy-dispersive diffraction in a diamond-anvil cell. Different pressure transmitting media and an internal pressure standard ...
Now showing items 5375-5394 of 21934