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Browsing ELibrary by Title
Now showing items 7721-7740 of 21936
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(2004)We have performed dissections of two diamondiferous eclogites (UX-1 and U33/1) from the Udachnaya kimberlite, Yakutia in order to understand the nature of diamond formation and the relationship between the diamonds, their ...
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(1987)In the vicinity of the Kola superdeep drillhole (SG-3), within the Pechenga volcanotectonic basin and its surroundings a subhorizontal boundary was identified by seismic exploration (deep seismic sounding, DSS) at a depth ...
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(1990)The phenomenon described here as first reported in 1993 by Pustovalov from Cape Balashov, Inostrantsev Bay, Novaya Zemlya Island. A 60 m thick member of jointed bituminous sandstone with partings of bituminous shale was ...
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(1999)Mixed-layer clay minerals are intermediate products of reactions involving pure end-member clays. They come from natural environments ranging from surface to low-grade metamorphic and hydrothermal conditions. Most often ...
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(2004)The structures of sodium silicate and aluminosilicate glasses quenched from melts at high pressure (6–10 GPa) with varying degrees of polymerization (fractions of nonbridging oxygen) were explored using solid-state NMR ...
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(1988)An experiment has been carried out which demonstrates the mechanism of displacement of blocks in the crust during the propagation of seismic waves. In the crust, with its block structure, there are always some blocks that ...
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(1988)Data obtained earlier by the reflection method [3, 4] enabled rocks of the sedimentary cover in this bay to be divided into two complexes. The upper complex is revealed by long reflecting boundaries, which are virtually ...
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(1990)Unique petrographic material on layered dolerite sills was obtained on the Siberian craton when its cover was drilled during field work by Yeniseyneftegazgeologiya. Here we shall consider data on the Anakit layered sill, ...
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(1989)We made the first investigation of photo- and X-ray luminescence of a series of new and rare minerals taken from various types of rocks (igneous, metasomatic, hydrothermal), of the Murun block, and attempted to evaluate ...
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(1999)Natural 99Tc and 239Pu were measured in ores from the Cigar Lake uranium deposit, in which U concentrations ranged from 0.3 to 55 wt%. Atomic ratios ranged from 1.4 x 10-12 to 51 x 10-12 for 99Tc/U and 2.4 x 10-12 to 44 x ...
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(2002)A new oncocerid genus, Thonoceras (type species T. lichutinense sp. nov.), with prochoanitic septal necks is described from the Upper Devonian of Novaya Zemlya.
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(1986)Nb/U ratios and Ce/Pb ratios are surprisingly uniform at 47 _+ 10 and 25 ___ 5, respectively, in both mid-ocean ridge basalts (MORB) and ocean island basalts (OIB). We show that these ratios also characterize ...
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(2000)New partition coefficients between liquid and pargasitic/kaersutitic amphiboles (Amph/LDNb,Ta) experimentally determined for Nb and Ta at upper-mantle conditions, combined with single-crystal structure refinement of the ...
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(2004)The Akaz metavolcanic rocks of the West Kunlun Mountains possess low to intermediate SiO(2) (42.3-64.7 wt%) and MgO (2.69-7.54 wt%) and high TiO(2) (0.94-3.05 wt%) and Fe(2)O(3)(T) (7.64-18.47 wt%), indicating a basaltic ...
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(1995)We report the trace element compositions of amphibole and mica separated from mantle xenoliths in alkali basalts and analyzed by ICP-MS. Nb and Ta are highly (50-200-fold) enriched in vein amphibole and mica relative to ...
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(1995)We report the trace element compositions of amphibole and mica separated from mantle xenoliths in alkali basalts and analyzed by ICP-MS. Nb and Ta are highly (50–200-fold) enriched in vein amphibole and mica relative to ...
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(1993)Nd and Sr isotopic data from diamond-bearing eclogites found in the Udachnaya kimberlite, Yakutia, Siberia, are interpreted as indicating an early (⩾ 4 Ga) differentiation event, whereby the mantle split into complementary ...
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(1996)Nd and Sr isotopic data are presented for the 2449–2441 Ma Olanga and Burakovka layered mafic complexes in the eastern Baltic Shield. These complexes have similar tectonic position, but differ in two aspects: the age of ...
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(2004)Nd isotopic composition and concentration distributions were determined in surface waters of the Northwest Pacific Ocean and its adjacent seas, i.e., the Okhotsk and Japan Seas. The Okhotsk and Japan Seas samples showed ...
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(1998)Analyses of the Nd isotopic composition and REE distribution in biogenic apatite (organophosphatic brachiopods and conodont elements) from the Cambrian and Ordovician sequences of the Baltic plate give new insights into ...
Now showing items 7721-7740 of 21936