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Browsing Геология России by Title
Now showing items 6580-6599 of 39126
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(2003)Fusion enthalpies were measured by differential scanning calorimetry (DSC) for mineral mix-tures of eutectic composition in the systems anorthite-diopside (An42Di58, wt%), anorthite-akermanite (An46Ak54), akermanite-diopside ...
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(1988)Eastern Transbaikal within the Chita oblast is traditionally regarded as having no potential for oil, gas and salts because suitable sedimentary strata are absent here. However, it has long been known that in the Torey ...
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(PANGAEA, 2000-11-03)
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(PANGAEA, 1999-11-15)
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(1998)Trace element partitioning between clinopyroxene and melt was investigated experimentally under conditions appropriate to near-solidus melting of spinel lherzolite in the upper mantle. Starting material was a high-Na, Al ...
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(1992)A wide variety of sediment types (mud to sandy gravel) was obtained at fourty-seven stations on the southern Black Sea shelf and upper slope and analyzed for their heavy-metal geochemistry. Distribution of grain size, ...
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(1998)The problem of understanding, assessing and quantifying the causes of sea-level changes has received increased attention during the past several years, in particular in connection with predictions regarding a rise in the ...
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HELIOLITOID CORALS WITH CORMIDIA: CHARACTERIZATION, TAXONOMIC COMPOSITION, AND STRATIGRAPHIC RANGE (2004)Four types of heliolitoid cormidia are established and characterized. Cormidia occur in 4 orders, 6 families, 27 genera, and 103 species. The heliolitoids with cormidia, as well as the entire subclass Heliolitoidea, reached ...
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(1985)A model of 4 He accumulation in a confined aquifer is presented which includes in situ production and a crustal degassing flux of 4 He into the bottom of a confined aquifer. The model is consistent with the measurements ...
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(1986)The isotopic compositions of He and Sr have been obtained for suites of ultramafic xenoliths brought to the surface by Recent volcanic eruptions in continental environments. Samples include a range of petrologic types from ...
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(2000)We developed a technique for extracting 4He from apatite and titanite using laser heating that permits measurement of U and Th and, hence, (U-Th)/He ages, on a single sample aliquot. Unlike direct laser heating, quantitative ...
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(1999)We have explored the diffusivity characteristics of radiogenic He in titanite (sphene) and have developed analytical techniques for (U-Th)/He dating of this mineral. Results of incremental He outgassing experiments performed ...
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(1996)To investigate the potential of the (U-Th)/He system for low-temperature thermochronometry, we have studied helium diffusion and have measured helium ages on Durango fluorapatite and on apatites from a gabbro and two ...
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(2006)Helium isotopes have been measured in samples of two ferromanganese crusts (VA13/2 and CD29-2) from the central Pacific Ocean. With the exception of the deepest part of crust CD29-2 the data can be explained by a mixture ...
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(PANGAEA, 2011-08-09)Helium isotope composition as an indicator of the mantle-derived component was studied in gases from mineral springs, stratal waters, and mud volcanoes developed west of the Teberda River valley (10 objects) and two springs ...
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(2002)The 3He/ 4He = R ratio was studied in underground fluids from 104 sites from the Baikal Rift Zone, BRZ, and adjacent areas in Russia and Mongolia. The R values vary from 1.0×E-8, typical of crustal radiogenic He, up to ...
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(PANGAEA, 2000-09-02)Results of studying isotopic composition of helium in underground fluids of the Baikal-Mongolian region during the last quarter of XX century are summarized. Determinations of 3He/4He ratio in 139 samples of gas phase from ...
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(2000)The aim of this paper was to generalize the results of studying the helium isotope composition in the subsurface fluids of the Baikal-Mongolia region for the last quarter of the XX century. The 3He/4He= R ratios were ...
Now showing items 6580-6599 of 39126