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Browsing Геология России by Title
Now showing items 3909-3928 of 39126
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(PANGAEA, 2007-09-09)Dinoflagellate cysts were studied in 42 samples from surface sediments of the White Sea. Total concentration of dinocysts varies from single cysts to 25000 cyst/g of dry sediments, which reflects biological productivity ...
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(2002)Seismic profiles and mollusks have been used to suggest that from ∼12 500 to 7000 yr BP, the Black Sea was an isolated freshwater lake containing potable water and implying a surface salinity of <1. According to Ryan and ...
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(1995)Eucrite, howardite, and diogenite members of the achondrite meteorites are considered by many to be genetically related. Therefore, each provides a piece of the puzzle for reconstructing magmatic processes on the eucrite ...
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(1998)Dissolution experiments of diopside and anthophyllite were conducted in continuously stirred flow-through reactors at temperatures of 25° and 90°C at acid pH. Stoichiometric steady state was reached at # 2700 h (at 25°) ...
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(2003)EET 90102 is the first known diopside-bearing EL6 chondrite. Diopside occurs in most aubrites and is occasionally found as rare small grains in unequilibrated enstatite chondrites, but is unknown from equilibrated enstatite ...
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DIOPTASE (2002)Describes the characteristic of dioptase. Description of the various bluish shades; Exhibition of cleavage and conchoidal to uneven fracture; Characterization as copper silicate hydroxide.
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(1997)The recoil distance of 39Ar is a vital discriminant among geochronological models. Direct measurement of recoil is possible by studying 39Ar implantation in SiO2 glass from a KCl crystal, and comparing one such glass ...
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(2001)A direct method for the determination of lead isotopic ratios by laser ablation-inductively coupled plasma-quadrupole mass spectrometry (LA-ICP-QMS) is presented. Samples of lake sediments were ground and pressed as pellets ...
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(2002)Chemical erosion in glacial environments is normally a consequence of chemical weathering reactions dominated by sulphide oxidation linked to carbonate dissolution and the carbonation of carbonates and silicates. Solute ...
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(1999)We report here direct ion microprobe dating of fossil tooth (dentine) of a Permian fresh-water shark, Orthacanthus senckenbergianus using the SHRIMP instrument recently installed at Hiroshima University. Fifteen spots on ...
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(2004)Here, we present a new technique for the direct measurement of Ca/Ca isotope ratios on a Multicollector Inductively Coupled Plasma Mass Spectrometer (MC–ICP–MS, AXIOM) using the ‘‘cool plasma’’ technique. By reducing the ...
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(2003)Temporally and spatially averaged models of bedload transport are inadequate to describe the highly variable nature of particle motion at low transport stages. The primary sources of this variability are the resisting ...
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(2002)Particulate matter plays an important role in the removal of metal ions from water in natural aquifers. Some of the most important of these materials consist of associations of inorganic particles (clay minerals, oxides) ...
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(2000)Although recent thermodynamic models predict a low-temperature miscibility gap in the pyrope-almandine-grossular garnet solid-solution series, coexistence of two immiscible garnets consistent with the calculated miscibility ...
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(2000)X-ray-absorption near-edge structure (XANES) was successfully applied for the direct determination of Ce valence in hydrogenetic ferromanganese nodules (two samples) and crust (one sample). Rare earth element (REE) patterns ...
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(2000)Previous studies have indicated that hydrous ferric oxide precipitates, formed and aged at low temperatures, exhibit solubility products of the form K*S0 = [Fe3+][H+]-m, where m < 3 ([ ] # free ion concentration). Although ...
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(1996)The availability of a synthetic multilayer crystal and accurately calibrated oxide and silicate standards make it possible to use the electron microprobe for precise a analysis of spinel. A requirement of the a measurement ...
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(2005)This paper is devoted to the study of the radon emanation coefficient vs. water mass fraction for mineral samples. Modeling is performed considering only the direct recoil phenomena and assuming planar pores with high ...
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(2001)Sequential simulation of a continuous variable usually requires its transformation into a binary or a Gaussian variable, giving rise to the classical algorithms of sequential indicator simulation or sequential Gaussian ...
Now showing items 3909-3928 of 39126