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Browsing ELibrary by Title
Now showing items 10098-10117 of 26297
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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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(2006)The nature of the crust in the Laxmi Basin, western margin of India is an uncertain issue; more importantly this has implications on paleo-geographic reconstructions of the western Indian Ocean. We have analysed three ...
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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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NATURE OF THE MARTIAN UPLANDS: EFFECT ON MARTIAN METEORITE AGE DISTRIBUTION AND SECONDARY CRATERING (2006)Martian meteorites (MMs) have been launched from an estimated 5-9 sites on Mars within the last 20 Myr. Some 80-89% of these launch sites sampled igneous rock formations from only the last 29% of Martian time. We hypothesize ...
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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 ...
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(2002)A Nd isotope map of early Cambrian epeiric basins has been inferred from the Nd isotopic signature recorded in phosphatic Small Shelly Fossils. The most radiogenic [epsilon]Nd(t) values characterize water reservoirs along ...
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(1996)The Nd isotopic composition of Atlantic and Tethys seawater, as deduced from marine phosphorites, varied considerably during the past 180 Ma. The early Tethys and Central Atlantic seawater from 180 to 160 Ma ago (Early-Middle ...
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(2004)Correlation of the Korean Peninsula with the neighboring South and North China blocks has been one of the most important and long debated issues in East Asian tectonics. The eastward extension of the Chinese collisional ...
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(2006)The Jurassic to Early Cretaceous magmatic arc of the Andes in northern Chile was a site of major additions of juvenile magmas from the subarc mantle to the continental crust. The combined effect of extension and a near ...
Now showing items 10098-10117 of 26297