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Browsing Геология России by Title
Now showing items 7100-7119 of 39195
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(2004)We developed an inversion method to estimate the spatial variation of scattering coefficient from observed envelopes of S coda waves. Synthetic envelopes are calculated on the basis of the single scattering theory, assuming ...
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IMAGING THE HETEROGENEITY OF MINERAL SURFACE REACTIVITY USING AG(I) AND SYNCHROTRON X-RAY MICROSCOPY (2003)Microscopic-scale imaging of reduced zones on the surfaces of minerals can be achieved by reaction with dilute Ag(I) solutions and subsequent analysis using synchrotron X-ray microscopy (XRM) above the Ag K-edge (25.5 keV). ...
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(2003)Palmer and Edmond [Earth Planet. Sci. Lett. 92 (1989) 11-26] indicated that thermally plausible oceanic hydrothermal inputs of strontium to the oceans are not sufficient to balance the riverine input. It has recently been ...
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(2005)α-Amino acids and α-hydroxy acids are well known constituents of several carbonaceous meteorites. One proposed mechanism of their formation is the reactions of CN−, NH3, aldehydes and ketones in aqueous solution, a ...
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(2001)The subject of this paper is the little known anomalous change in the electrical characteristics of the near-ground atmosphere arising a few tens of hours to a few hours before earthquakes. Observations of electric-intensity ...
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(2004)Exsolution (unmixing) of the volatile element-rich phases from cooling and crystallising silicate magmas is critical for element transport from the Earth’s interior into the atmosphere, hydrosphere, crustal hydrothermal ...
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(1996)The literature data of nine different occurrences of coexisting mineral pairs of Ca-amphibole have been studied and the bulk vectors, spanning the miscibility gap, derived. The additive component is always impure Mg-tremolite ...
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IMMISCIBILITY OF ALUMOSILICATE-ALKALI ALUMOFLUORIDE MELTS IN THE LIQUIDUS ZONE (EXPERIMENTAL DATA) (1989)The alkali-alumosilicate system consisting of albite, orthoclase, quartz and water has long been used as a simplified model granite system. Crystallization of granitic magma leaves the residual melt richer in volatile and ...
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(1987)A series of melting tests were conducted on samples of various compositions collected from volcanic rocks of the Rudnyy Altai ore-bearing complexes, as well as from obsidian formed in most recent volcanic eruptions in ...
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(2003)The study of processes related to the heterogenization of fluid released from magma is of special interest because the presence of immiscible fluid phases in melt facilitates the determination of geochemical (ore) ...
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(2004)Melt and fluid inclusions in minerals from the peralkaline granite intrusion and associated mineralized country rocks from the Yermakovka F–Be deposit were studied to characterize the behaviour of trace elements and exsolved ...
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(1999)Coexisting liquids in the SiO2-TiO2-Al2O3 system have been synthesized at 2000 K to 2500 K with a laser-heated air levitation set-up in order to determine the SiO2-TiO2 miscibility gap and its extrapolation to the Al2O3-bearing ...
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(2006)We explore the partial melting behavior of a carbonated silica-deficient eclogite (SLEC1; 5 wt % CO2) from experiments at 3?GPa and compare the compositions of partial melts with those of alkalic and highly alkalic oceanic ...
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(2005)The sorption capacity of montmorillonite clay minerals for small cations, such as Ni2+, can be greatly enhanced by modifying the clay mineral with Al(III). In this study, the mechanisms of Ni uptake by Al-modified ...
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(2002)The potential for incorporation of strontium (Sr) into biogenic Fe(II)-bearing minerals formed during microbial reduction of synthetic hydrous ferric oxide (HFO) was investigated in circumneutral bicarbonate-buffered medium ...
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(2005)α-amylase was immobilized on acid-activated montmorillonite K-10 via adsorption and covalent linkage. The immobilized enzymes were characterized by X-ray diffraction (XRD), surface area measurements, 27Al nuclear magnetic ...
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(1999)The detailed morphology of impact craters is now believed to be mainly caused by the collapse of a geometrically simple, bowl-shaped "transient crater." The transient crater forms immediately after the impact. In small ...
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(1990)Since the accretion model is now generally accepted in the current cosmogony of the planets, the problem of the transformation of their material amounts to determining the main mechanism of accumulation, with all the ...
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(2002)Most of the 3-mm-thick globally distributed Chicxulub ejecta layer found at the Cretaceous-Tertiary (K-T) boundary was deposited as condensation droplets from the impact vapor plume. A small fraction of this layer (<1%) ...
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(2002)There is a modern-day hazard, threatening the existence of civilization, from impacts of comets and asteroids larger than 1.5 km diameter. The average annual world fatality rate is similar to that due to significant accidents ...
Now showing items 7100-7119 of 39195