Sandstone-hosted uranium deposits as a possible source for critical elements: the Eureka mine case, Castell-Estaó, Catalonia

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Please use this identifier to cite or link to this item: http://hdl.handle.net/11703/120665
Title: Sandstone-hosted uranium deposits as a possible source for critical elements: the Eureka mine case, Castell-Estaó, Catalonia
Authors: Consorci del Museu de Ciències Naturals de Barcelona
Castillo-Oliver, Montgarri
Melgarejo, Joan Carles
Torró, Lisard
Vilanova-de-Benavent, Cristina
Campeny, Marc
Díaz-Acha, Yael
Amores-Casals, Sandra
Xu, Jingyao
Proenza, Joaquín A.
Tauler, Esper
Issue Date: 30-Dec-2019
Keywords: Reacció d'oxidació-reducció
Roques sedimentàries
Roques meamòrfiques
Vanadi
Urani
Coure
Terres rares
Cobalt
Níquel
Seleni
Mines
Catalunya
549 - Mineralogia
Access to document: http://hdl.handle.net/2072/367641
Extent: 34 p.
Abstract: The Eureka deposit in Castell-estaó in the Catalan Pyrenees is a Cu–U–V deposit, hosted by Triassic red-bed sandstones, and classified here as a low-temperature, sandstone-hosted stratabound metamorphite U deposit. The main mineralisation is stratabound, related to coal-bearing units and produced during the Alpine deformation by migration of hydrothermal fluids. In this stage, the original sedimentary and diagenetic components (quartz and calcite, micas, hematite and locally apatite) were replaced by a complex sequence of roscoelite, fine-grained REE phosphates, sulphides and Ni–Co arsenides and sulpharsenides, Ag–Pb selenides, bismuth phases, sulphosalts and uraninite. The black shales of the Silurian sediments underlying the deposit and the nearby Carboniferous volcanoclastic rocks are interpreted as the source of the redox-sensitive elements concentrated in Eureka. The sulphur source is related to leaching of the evaporitic Keuper facies. The REE transport would be facilitated by SO4-rich solutions. The reduction of these solutions by interaction with organic matter resulted in the widespread precipitation of REE and redox-sensitive elements, including many critical metals (V, Bi, Sb, Co), whereas barite precipitated in the oxidized domains. The occurrence of similar enrichments in critical elements can be expected in other similar large uranium deposits, which could be a source of these elements as by-products. Keywords: critical metals; redox-sensitive elements; red bed; metamorphite; vanadium; uranium; copper; rare earth elements; cobalt; nickel; selenium
Terms of use: CC-BY
Appears in Collections:Mineralogia / Articles

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