RT Journal Article
T1 Uranium distribution and mobility in the weathering zone of the Nisa deposit, Portugal
A1 Prazeres, Cátia
A1 Batista, Maria João
A1 Jorge Pinto, Andre Filipe
A1 Gonçalve, Mário
AB The Nisa deposit is the largest known uranium reserve in the country, and is hosted by metasediments of the Beiras Group, in the Alto Alentejo region, central Portugal. After almost two decades without significant studies, the current trend to seek improved knowledge of raw materials motivated the application of different surface geophysical and geochemical characterization methods, which proved to be a valuable exploration approach for this type of deposit. Detailed mapping in the experimental open pit showed the structural aspects controlling the mineralization. A radiometric survey of the deposit was carried out, providing a map of the main sites of mineralization. The U mineralization is of secondary origin, formed exclusively by uranyl phosphates that were formed during the development of a weathering profile. The mineralization occurs along schistosity planes, quartz veinlets and alteration zones, along a general trend N60°–80°W (approximately the same as S0) in association with iron oxyhydroxides, as demonstrated by both petrographic and geochemical data. These hydroxides, in addition to the geochemical characteristics of the host rocks, were key factors in the precipitation and trapping of dissolved uranyl ions.
PB Springer
SN 1698-6180
YR 2018
FD 2018-07-03
LK https://hdl.handle.net/20.500.14352/101015
UL https://hdl.handle.net/20.500.14352/101015
LA eng
NO Prazeres, C. M., et al. «Uranium Distribution and Mobility in the Weathering Zone of the Nisa Deposit, Portugal». Journal of Iberian Geology, vol. 44, n.o 3, septiembre de 2018, pp. 497-512. DOI.org (Crossref), https://doi.org/10.1007/s41513-018-0074-2.
DS Docta Complutense
RD 17 abr 2025