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Oxidation–hydration weathering of uraninite: the current state-of-knowledge
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SYSNO ASEP 0435522 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Oxidation–hydration weathering of uraninite: the current state-of-knowledge Author(s) Plášil, Jakub (FZU-D) RID, ORCID Source Title Journal of Geosciences. - : Česká geologická společnost - ISSN 1802-6222
Roč. 59, č. 2 (2014), s. 99-114Number of pages 16 s. Language eng - English Country CZ - Czech Republic Keywords weathering of uraninite ; paragenetic sequence ; bond-valence theory ; uranyl–oxide minerals ; radiogenic lead ; thermodynamics Subject RIV DB - Geology ; Mineralogy R&D Projects GP13-31276P GA ČR - Czech Science Foundation (CSF) Institutional support FZU-D - RVO:68378271 UT WOS 000341693800002 DOI 10.3190/jgeosci.163 Annotation Oxidation–hydration weathering of uraninite, the most common U-bearing mineral in nature, comprises various physical and chemical processes that lead to the destruction of the fluorite-type structure of uraninite where U is present as tetravalent. This results in replacement of uraninite by weathering products containing U in hexavalent form, i.e. as uranyl ion, UO22+. The final assemblage of the weathering products, uranyl minerals, and their compositions depend on the various factors, namely the composition of the primary minerals and percolating oxidizing fluids that cause the alteration. The knowledge of such processes and stabilities of the uranium minerals is of the great interest namely due to demand for U as the energy source. During the past decade there has been substantial progress in understanding the mineralogy, crystallography and thermodynamics of uranyl minerals and thus a substantially improved understanding of the weathering processes themselves. Workplace Institute of Physics Contact Kristina Potocká, potocka@fzu.cz, Tel.: 220 318 579 Year of Publishing 2015
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