Počet záznamů: 1
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 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název Multi-scale visualization of uranium-rich domains dispersed in U-Zr mineralization of sandstone-type (Břevniště, Czech Republic) Tvůrce(i) 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)Číslo článku 104358 Zdroj.dok. Ore Geology Reviews. - : Elsevier - ISSN 0169-1368
Roč. 138, November (2021)Poč.str. 16 s. Jazyk dok. eng - angličtina Země vyd. NL - Nizozemsko Klíč. slova Computed tomography ; Automated mineralogy ; Uranium deposit ; Sandstones ; Zirconium Obor OECD Mineralogy Způsob publikování Omezený přístup Institucionální podpora GLU-S - RVO:67985831 UT WOS 000702295900002 EID SCOPUS 85111612528 DOI 10.1016/j.oregeorev.2021.104358 Anotace 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. Pracoviště Geologický ústav Kontakt Jana Popelková, popelkova@gli.cas.cz, Sabina Janíčková, Tel.: 233 087 272 Rok sběru 2022 Elektronická adresa https://www.sciencedirect.com/science/article/pii/S016913682100384X
Počet záznamů: 1