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Browsing ELibrary by Title
Now showing items 5319-5338 of 21934
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(2000)109 new measurements of ³He/⁴He ≡ R in subsurface fluids of the Northern Caucasus coupled with the data obtained previously allow regional regularities in the distribution of helium isotopic composition to be examined. ...
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(2002)Peridotites and basalts from continental areas over the world show a helium isotopic ratio that is relatively homogeneous and more radiogenic than the MORB source. The mean ratio is 118#000+/-15#500 (R/Ra=6.1+/-0.9), ...
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(1997)Helium, argon, and xenon were measured in vesicles of MORB from a variety of locations and in sequential crushing steps in two locations. Melting extractions, compared to these data, indicate that most of the trapped ...
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(1996)New noble gas data are presented for ultramafic mantle xenoliths, occurring in 10-20 Ma old volcanics from the Kerguelen Archipelago. Fusion results indicate that neon is isotopically primitive, whereas helium shows ...
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(1997)Helium, neon, and argon in metallic Fe-Ni separated from the three solar-gas-rich H-chondritic meteorites Acfer111, Fayetteville, and Noblesville were analysed by stepped etching in vacuo. The isotopic composition of the ...
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(2003)Hematophagous insect fossils are reviewed. The origin of hematophagy in various dipteran groups is discussed.
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(2004)In contrast to the liquid outer core, the earth's inner core is mostly solid, and its composition is more pure iron. Based on dynamic arguments related to the freezing process of the inner core, and the observation of much ...
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(2002)Experimental studies for the partitioning of Br as a trace element between aqueous and solid solutions were carried out in simple marine systems. The evaporation experiments were performed at 25°C and 1 atm in the systems ...
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(1996)The applicability of rapid and precise laser probe analysis of tooth enamel for δ18O has been verified, and the method has been applied to different modern herbivores in East Africa. Sampling and pretreatment procedures ...
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(2006)This paper presents new data for the structure and age of the Paleozoic rocks in the Ikat-Bagdarin zone of the West Transbaikalia region. Reported for the first time is the wide development of various Devonian and Carboniferous ...
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(2001)Fossil remains of Bombina variegata, Pelobates fuscus, Bufo raddei, Rana lessonae, Rana arvalis, Lacerta agilis, Elaphe longissima, Natrix natrix, Natrix cf. tesselata, and Vipera ursini from Khazarian deposits of the ...
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(1999)The paper gives the definition of the North-Asian craton as a geological structure. The evolution of conception and views of its structure and boundaries is considered, and a brief overview of its geologic history in terms ...
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(2004)The nucleation of H2O bubbles in magmas has been proposed as a trigger for volcanic eruptions. To determine how bubbles nucleate heterogeneously in silicate melts, experiments were carried out in which high-silica rhyolitic ...
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(2002)Abstract— We investigate heterogeneous nucleation and growth of graphite on precondensed TiC grains in the gas outflows from carbon-rich asymptotic giant branch (AGB) stars employing a newly-derived heterogeneous nucleation ...
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(2003)Modeling the plastic deformation and texture evolution in halite is challenging due to its high plastic anisotropy at the single crystal level and to the influence this exerts on the heterogeneity of deformation over halite ...
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(2002)An electron paramagnetic resonance (EPR) investigation was performed on the insoluble organic matter from the Orgueil and Murchison meteorites and on terrestrial coals with similar elemental composition. A complementary ...
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(1999)Distribution of solar, cosmogenic, and primordial noble gases in thin slices of Murchison, Murray, and Nogoya CM carbonaceous chondrites was determined by the laser microprobe analysis so as to put some constraints on the ...
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(2003)In the first known kinetic application of the technique, synchrotron 57Fe-Mossbauer spectroscopy was used to follow the rate of heterogeneous electron transfer between aqueous reagents and a solid phase containing Fe. The ...
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(2002)The existence of heat-producing elements (U, Th, K) and their highly heterogeneous distribution in the Earth's mantle suggests a link between thermal and chemical properties of the mantle. Previous studies have shown that ...
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(1996)The ability of modern Raman microprobes to determine the crystallinity of zircon with a lateral resolution of about 1 μm and a volume resolution of less than 5 μm3 opens up new opportunities for correlating structural, ...
Now showing items 5319-5338 of 21934