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Multi-scale visualization of uranium-rich domains dispersed in U-Zr mineralization of sandstone-type (Břevniště, Czech Republic)
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SYSNO ASEP 0544540 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Multi-scale visualization of uranium-rich domains dispersed in U-Zr mineralization of sandstone-type (Břevniště, Czech Republic) Author(s) Mikysek, Petr (GLU-S) SAI, ORCID
Zikmund, T. (CZ)
Dosbaba, M. (CZ)
Břínek, A. (CZ)
Slobodník, M. (SK)
Adamovič, Jiří (GLU-S) RID, SAI, ORCID
Mészárosová, Noemi (GLU-S) ORCID, RID, SAI
Trojek, T. (CZ)
Kaiser, J. (CZ)Article number 104358 Source Title Ore Geology Reviews. - : Elsevier - ISSN 0169-1368
Roč. 138, November (2021)Number of pages 16 s. Language eng - English Country NL - Netherlands Keywords Computed tomography ; Automated mineralogy ; Uranium deposit ; Sandstones ; Zirconium OECD category Mineralogy Method of publishing Limited access Institutional support GLU-S - RVO:67985831 UT WOS 000702295900002 EID SCOPUS 85111612528 DOI 10.1016/j.oregeorev.2021.104358 Annotation Multi-level visualization of U-Zr mineralization in sandstones is discussed, aiming at the identification of mineral phases, imaging of their distribution using 2D and 3D projections, and quantification of the presence of U-rich domains. For this purpose, uranium-bearing sediments with anomalous concentrations of Zr, Nb ± Fe, Sr were studied (Břevniště deposit, Czech Republic). The applied multi-instrumental approach included selection of the most suitable areas in core samples (highest U and Zr concentrations) using X-ray fluorescence analysis (XRF). The presence of numerous detrital and authigenic accessories, hardly discernible using optical methods, was confirmed with the use of automated mineralogical analysis (TIMA). Hydrozircon and metacolloidal mixed phases were shown to be the carriers of uranium. Their close relationship to sulfides, Fe oxyhydroxides and clay minerals was documented using phase distribution maps. X-ray micro-computed tomography (μCT) was used for the visualization of internal structures of uranium-bearing sandstones. Based on a series of thresholding of μCT data, segmentation of selected samples was performed with subsequent visualization of selected mineral phases. The combination of TIMA and μCT analysis allowed for an effective discrimination of U-rich areas and quantification of their volume. This approach provides new possibilities in imaging elementary complex disseminated uranium mineralizations. Workplace Institute of Geology Contact Jana Popelková, popelkova@gli.cas.cz, Sabina Janíčková, Tel.: 233 087 272 Year of Publishing 2022 Electronic address https://www.sciencedirect.com/science/article/pii/S016913682100384X
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