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Geochemistry of shear zone-hosted uranium mineralisation at the Zadní Chodov uranium deposit (Bohemian Massif)
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SYSNO ASEP 0532311 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název Geochemistry of shear zone-hosted uranium mineralisation at the Zadní Chodov uranium deposit (Bohemian Massif) Tvůrce(i) Havelcová, Martina (USMH-B) RID, ORCID
Machovič, Vladimír (USMH-B)
René, Miloš (USMH-B) RID, ORCID, SAI
Sýkorová, Ivana (USMH-B) RID, ORCID
Lapčák, L. (CZ)
Špaldoňová, Alexandra (USMH-B) ORCIDČíslo článku 103428 Zdroj.dok. Ore Geology Reviews. - : Elsevier - ISSN 0169-1368
Roč. 120, MAY 2020 (2020)Poč.str. 16 s. Forma vydání Tištěná - P Jazyk dok. eng - angličtina Země vyd. NL - Nizozemsko Klíč. slova Brannerite ; Graphite ; Uranium ; Organic matter ; Bohemian Massif ; Micro-Raman spectroscopy Vědní obor RIV DD - Geochemie Obor OECD Geology CEP GA19-05360S GA ČR - Grantová agentura ČR Způsob publikování Omezený přístup Institucionální podpora USMH-B - RVO:67985891 UT WOS 000530673300034 EID SCOPUS 85079904282 DOI 10.1016/j.oregeorev.2020.103428 Anotace Samples from the Zadni Chodov uranium deposit of the Bohemian Massif were analysed using optical and chemical methods. Organic matter and brannerite were studied in detail to estimate conditions that prevailed in association with uranium-enriched shear zones. Four major events are known in the high-grade metasediments. The pre-ore stage is associated with the formation of shear zones. During the uranium ore deposition stage, temperatures ranged from 122 degrees C to 258 degrees C, and coffinite and brannerite appeared. Two generations of post-ore stage minerals are distinguishable. A detailed study of a brannerite mineral grain revealed variations in its interior and surroundings, but these are related to the composition of brannerite, which is not a nominal mineral. Si and Al are presented as chlorites, but the main mineral phases are mixtures of anatase, oxidized brannerite with non-stoichiometric uranium oxide, and carbonaceous matter. Carbonaceous matter in the samples studied appeared as a mixture of substances of different composition, origin, and age. Optical and structural characteristics showed variations in three coexisting types of metamorphosed carbonaceous matter, including fine-grained and larger lamella-shaped particles that represent anthracite, meta-anthracite and semi-graphite stages, lamellas of crystalline graphite, and pyrobitumen, corresponding to impsonite. The structure of organic particles was not affected by uranium minerals, which is an interesting difference from changes that minerals undergo in, for example, coal. Biomarkers, compounds used in assessing sources of organic matter, were present in extracts, but they were not a remnant of the original shear zone organic material. They are likely products from a later impact, probably of Tertiary and younger sediments. Pracoviště Ústav struktury a mechaniky hornin Kontakt Iva Švihálková, svihalkova@irsm.cas.cz, Tel.: 266 009 216 Rok sběru 2021 Elektronická adresa https://www.sciencedirect.com/science/article/pii/S0169136819307127?via%3Dihub
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