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Browsing Геология России by Title
Now showing items 16518-16537 of 39126
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(1985)Uranium-series disequilibrium dating of island phosphate deposits is evaluated in terms of known associated coral ages, uranium geochemistry, and stratigraphic sequences as well as the concordance between the geochronometers ...
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(1997)Theoretical methods are used with the available experimental data to provide estimates of parameters for the revised-HKF equations of state for aqueous uranium species. These parameters are used with standard state ...
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(1994)The solubility of uranium was investigated in both carbonated aqueous fluid and granitic melt in equilibrium in the system haplogranite-uranium oxide-H2O-Na2CO3 (0.5–1 molal) at 720–770°C, 2 kbar, andƒo2 fixed by Ni-NiO, ...
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(1996)The solubility of uranium oxide was investigated in both aqueous halide (Cl, F) fluid and granitic melt in equilibrium in the system uranium oxide-haplogranite-H2O-NaCl (0.1 5.0 molal), NaF (0.1 0.5 molal) at 770°C, 2 kbar, ...
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URANIUM(VI) SORPTION TO HEMATITE IN THE PRESENCE OF HUMIC ACID - IMPORTANCE OF CHARGE NEUTRALIZATION (1999)A long-standing problem in aquatic geochemistry has been the incorporation of natural organic matter (NOM) into speciation models. The general effect of NOM on metal ion sorption by particles has been understood for some ...
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(1989)The question of the age of oldest rocks on the Aldan shield is keenly debated. We analyze the results of our uranium-lead isotope dating of accessory zircons from mafic rocks of the Kurul'ta complex. This Early Archean ...
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(1990)The U-Pb isotope dating of zircons of the second variety was done by the accepted laboratory procedure. Uranium and lead concentrations were determined by the isotopic dilution method. The lead-isotope composition was ...
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(2003)An increasing number of scientists recognize the value of speleothems1 as often extremely well-preserved archives of information about past climate, vegetation, hydrology, sea level, nuclide migration, water-rock interaction, ...
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(1996)The large volume of water, approximately one-fifth of the total surface fresh water on the planet, contained in Lake Baikal in southeastern Siberia is distinguished by having a relatively high concentration of uranium (ca. ...
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(2004)238U, 234U, and 230Th concentrations in samples of Baikal bottom sediments from the submerged Akademichesky Ridge were measured by ICP-MS, which is 100 times as fast as the traditional alpha spectrometry. These concentrations, ...
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(2004)Speciation of uranium (VI) in acetate solutions between 25 and 250°C, at pH values between 1.8 and 3.8 and acetate/uranium (Ac/U) ratios of 0.5 to 100 has been investigated using uranium LIII-edge X-ray absorption spectroscopy. ...
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(2005)The fate and transport of uranium in contaminated soils and sediments may be affected by adsorption onto the surface of minerals such as montmorillonite. Extended X-ray absorption fine structure (EXAFS) spectroscopy has ...
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(2006)Detailed understanding of the respective roles of solution and surface parameters on the reactions at uranyl solution/Al-(hydr)oxide interfaces is crucial to model accurately the behaviour of U in nature. We report studies ...
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(1997)We report microprobe analyses for eight ureilite samples (ALH A78019, ALH 82106, ALH 82130, ALH 84136, LEW 85328, LEW 85440, MET A78008, and RKP A80239) and calibrate smelting reactions characteristic of ureilites using ...
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(1987)Carbonaceous vein separates from Kenna and Haverö, as well as bulk Kenna, were analyzed by RNAA for Ag, Au, Bi, Br, Cd, Cs, Ge, In, Ir, Ni, Pd, Os, Rb, Re, Sb, Se, Te, Tl. U, and Zn. The data are reviewed together with ...
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(2000)Urusovite, ideally Cu[AlAsO5], has been found in a fumarole in the North Breach of the great fissure Tolbachik eruption (1975-76, Kamchatka peninsula, Russia). It occurs as light-green plates up to 0.4 mm in maximal ...
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(2003)The terms calcalkaline and calcalkalic are currently defined and used in multiple and non-equivalent ways. Generally, the variation of total Fe as FeO/MgO within evolving subalkaline rock suites is regarded as the most ...
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(2001)Though not typically regarded as ''biomarkers'' in the traditional sense of the word, the radioactive and stable isotopes of carbon (14C and 13C, respectively) can serve as powerful tools for identifying sources and ...
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(1989)The author believes that the montage principle offers better prospects for the solution of nonlinear inverse problems for special groups (montage, grid) of density inhomogeneities. In the present paper we describe a new ...
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(1995)Slit shells are living fossils which inhabit the continental slope. Aspartic acid racemization in the nacreous layer of the slit shell Entemnotrochus adansonianus is shown to occur at a remarkably high rate, sufficient to ...
Now showing items 16518-16537 of 39126