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Browsing ELibrary by Title
Now showing items 13667-13686 of 21934
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(2003)Marine Fe-Mn oxyhydroxide crusts form by precipitation of dissolved components from seawater. Three hydrogenetic crust samples (one phosphatized) and two hydrothermal Mn-oxide samples were subjected to a sequential-leaching ...
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(2003)We substantiate theoretically the recognition of the Paleozoic-Early Mesozoic Ural-Paikhoi-Novaya Zemlya fold belt as Uralides not analogous to Hercynides (Variscides) and the preceding Late Vendian Timan folded structures ...
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(2004)Описан новый вид Uraloceras subsimense Kutygin sp. n. из эчийского горизонта пермской системы Верхоянья. Рассмотрены его филогенетические связи и историческое положение в развитии пермского сообщества аммоноидей региона.
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(2003)Magnetite is one of the most important end member of iron corrosion products under a reducing environment; therefore, it may be one of the first products interacting with radionuclides in a radioactive waste disposal after ...
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(1998)This paper presents new experimental data on the tracer diffusion rates of U and Th in diopside at 1 atm and 1150-1300°C. Diffusion couples were prepared by depositing a thin layer of U-Th oxide onto the polished surface ...
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(2002)We have developed techniques by sector-field inductively coupled plasma mass spectrometry (ICP-MS) for measuring the isotopic composition and concentration of uranium and thorium, focusing on the rare isotopes, 230Th and ...
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(2002)In oxidizing environments, the toxic and radioactive element uranium (U) is most soluble and mobile in the hexavalent oxidation state. Sorption of U(VI) on Fe-oxides minerals (such as hematite [α-Fe2O3] and goethite ...
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(2001)The paper presents the characteristics of the main uranium deposits of the El'kon ore district in the Aldan Shield, which is regarded as the primary reserve of uranium resources in Russia. The deposits are localized in ...
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URANIUM DISTRIBUTION IN ORE-BEARING ROCKS OF THE MALINOV DEPOSIT: EVIDENCE FROM FISSION RADIOGRAPHY (2004)Application of f-radiography for the study of ore-bearing rocks of the Malinov uranium deposit revealed the following specific features: (1) occurrence of uranium in both authigenic and terrigenous components; (2) important ...
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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, ...
Now showing items 13667-13686 of 21934