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Browsing ELibrary by Title
Now showing items 5439-5458 of 21934
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(1989)The boundary dated at 200 to 1800 m.y. marks an event that is of fundamental importance in the Earth's history and separates the early stages of planetary evolution from the Neogaean with its present type of geodynamics. ...
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HIGH-YIELD LITHIUM SEPARATION AND THE PRECISE ISOTOPIC ANALYSIS FOR NATURAL ROCK AND AQUEOUS SAMPLES (1998)A high-yield lithium separation technique for rock and aqueous samples has been established together with precise Li isotope analysis by thermal ionization mass spectrometry. Four separate stages of ion-exchange chromatography ...
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(2000)Tri- and tetraunsaturated highly branched isoprenoid (HBI) alkenes are widespread sedimentary geochemicals but few have been isolated from sediments in sufficient quantities for rigorous identification. However, two C25 ...
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(2003)The abundances of the highly siderophile elements (HSE), Re, Os, Ir, Ru, Pt and Pd, were determined by isotope dilution mass spectrometry for bulk samples of 13 carbonaceous chondrites, 13 ordinary chondrites and 9 enstatite ...
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(2003)Hillite ('(sic)' in Russian), ideally Ca-2(Zn,Mg)[PO4](2).2H(2)O, is a new zinc-dominant analogue of collinsite, isostructural with fairfieldite. It occurs in unmetamorphosed sediments. of the Lower Cambrian Parachilna ...
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(2002)Variability in surface condition occurs at different spatial and temporal scales. Locally, surface conditions interact with soil components and determine the dynamic of surface sealing, biomass, and roughness. At the ...
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(1987)The paper discusses a model of a granular porous medium whose microstructure is formed by rigid grains separated by compliant partings. The grains form conglomerates of various scales, with a definite size hierarchy. ...
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(1999)In the framework of the Russian-French project, a series of geodesic stations for studying present-day crust deformations by the GPS method was organized on the Baikal geodynamic test ground. Processing of data of 3-year-long ...
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(2003)An exact knowledge of rock formation ages is perhaps the single most important tool needed for assembling the geologic record into a coherent history. Moreover, the age of Earth and the time scale of pre-human events are ...
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(2001)Ancient Babylonian clay tablets buried for centuries beneath the sands of the desert are part of an extensive historical archive which contains vital information about the rotation of the Earth. Many eclipse records are ...
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(2003)The morphology, structural setting, and evolution of the Baikal rift system has been controlled by its position at the junction of the Siberian craton and the Central Asian mobile belt, two major tectonic units with ...
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(2004)Instead of having been more or less constant, as once assumed, it is now apparent that the major ion chemistry of the oceans has varied substantially over time. For instance, independent lines of evidence suggest that ...
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(2004)Two bottom sediment cores (BP00-23/7 and BP00-7/6) recovered from the Yenisei transect in the southern Kara Sea are described. Data on their grain size composition, clay and heavy mineral assemblages, and distribution of ...
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(1998)A large body of data was collected in this study and systematized in terms of the ages of intraplate volcanic activities in the Pacific Ocean. Analysis of the data revealed a dependence of the intensity of volcanism on the ...
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(1993)
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(2004)Based on the study of the Tsentral'noe deposit, specific features of the formation of mineral assemblages of complex titanium–zirconium placers are considered. The placers formed during the multiple redeposition of clastogenic ...
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(2002)The discipline of organic geochemistry is an outgrowth of the application of the principles and methods of organic chemistry to sedimentary geology. Its origin goes back to the last part of the nineteenth century and the ...
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(1997)A detailed study of size distributions of framboidal pyrite in Holocene Black Sea sediments establishes the timing of a change from deposition under an oxic water column to deposition under an anoxic and sulfidic water ...
Now showing items 5439-5458 of 21934