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Browsing ELibrary by Title
Now showing items 11074-11093 of 21768
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STRONTIUM ISOTOPE VARIATIONS IN LOWER TERTIARY-QUATERNARY VOLCANIC ROCKS FROM THE KURILE ISLAND ARC (1987)Average 87Sr/86Sr ratios for lavas from Quaternary and Pleistocene volcanoes of the Kurile island arc, NW Pacific, decrease from 0.7035 in the south to 0.7032 in the north. The northern Kuriles are characterised by K2Oricher ...
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(2002)Sr isotopic composition in carbonate rocks of the Baikit anteclise and Yenisei Ridge, western margin of the Siberian craton, has been analyzed. These rocks were formed between 1500-1450 and 850 Ma. Carbonate deposits of ...
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(1997)Provenance changes of silicate sediment deposited during the Late Cenozoic (5–0 Ma) on the Alpha Ridge, central Arctic Ocean are determined from variations in strontium, lead, and neodymium isotope compositions. Whereas ...
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(2002)The paragenesis and compositional variation of strontium-apatite from three new localities are characterized. At Lovozero, in the Kola Peninsula, Russia, strontium-apatite forms elongate crystals and thin reaction-induced ...
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(2001)The Murun massif is composed of a complex association of alkali, nepheline, and kalsilite syenites and includes specific carbonatites with BaO- and SrO-rich carbonates, which belong to a special type of barium-strontium ...
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(2003)Different forms of structural and chemical heterogeneity are considered including mixed-layer minerals, disordered layer structures containing rotational and translational stacking faults, interstratification of ...
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(2004)The oldest volcanic glass in the uniquely fresh siliceous high-Mg (boninite-like) lavas of the Vetrenyi Poyas complex with an age of about 2.41 Ga from the Vetrenyi Poyas rift structure in Karelia was studied for the first ...
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(2003)The mobility and toxicity of Cr within surface and subsurface environments is diminished by the reduction of Cr(VI) to Cr(III). The reduction of hexavalent chromium can proceed via chemical or biological means. Coupled ...
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(2001)We present the results of large-scale computer simulations in which we investigate the static and dynamic properties of sodium disilicate and sodium trisilicate melts. We study in detail the static properties of these ...
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(1998)The finding of microdiamond and coesite in the high-pressure metamorphic rocks of the Kokchetav massif (Caledonides of Central Asia, Northern Kazakhstan) evidence that the crustal rocks were transformed at great depth (more ...
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(2003)The diamond obtained from the Novo-Urei meteorite by acid leaching was examined using a combination of X-ray diffractometry (XRD), transmission electron microscopy (TEM), and scanning electron microscopy (SEM). The ...
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(1988)Many authors have substantiated the synchronous expansion or contraction of sea basins in different parts of the world. On the other hand, it is well known that transgressions and regressions were contemporaneous in isolated ...
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STRUCTURAL AND PETROLOGICAL EVOLUTION OF THE BORON-IRON TAYOZHNOYE DEPOSIT (CENTRAL ALDAN, RUSSIA) (2002)The contact-metasomatic boron-iron Tayozhnoye deposit located in the central part of the Aldan Shield is unique compared to other skarn deposits with enormous reserves of high-quality ores of iron and accompanying components ...
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(2004)SnO2 nanoparticles were prepared by hydrolysis in aqueous medium and stabilized by montmorillonite or hectorite. The tin content of SnO2/clay nanocomposites varied between 15 and 50 wt.%. Intercalation of tin dioxide ...
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(2001)Using single-crystal X-ray diffraction from a diamond anvil cell, the compressibility of a synthetic fluorapatite was determined up to about 7 GPa. The compression pattern was anisotropic, with greater change along a than ...
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(2001)High-pressure Raman investigations were carried out on a synthetic fluorapatite up to about 7 GPa to analyse the behaviour of the phosphate group's internal modes and of its lattice modes. The Raman frequencies of all modes ...
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(1995)The anionic structure of aluminosilicate melts has been determined along the join Li2Si2O5-Li2(LiAl)2O5 (LS2-LA2) with microRaman spectroscopy in the temperature range 25°-1460°C. Those data are compared with the structural ...
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(2004)The influence on the structure of Fe2+ → Mg substitution was studied in synthetic single crystals belonging to the MgCr2O4–FeCr2O4 series produced by flux growth at 900–1200 °C in controlled atmosphere. Samples were analyzed ...
Now showing items 11074-11093 of 21768