Uranium favourability study in Nigeria
1986; Elsevier BV; Volume: 5; Issue: 2 Linguagem: Inglês
10.1016/0899-5362(86)90007-2
ISSN0731-7247
Autores Tópico(s)Radioactive element chemistry and processing
ResumoGeological considerations indicate that four types of uranium deposits, three from within the crystalline rocks and the fourth from the sedimentary formations, can be explored for in Nigeria. The Precambrian Basement Complex underwent crustal reactivation in Pan-African times (600 ± 150 Ma) during which migmatites and rocks of the Older Granite suite were emplaced. The occurrences of these rocks in northeastern, north-central and central Nigeria are possible hosts for the granitic type of uranium deposit. Vein-type uranium deposits are often localized in areas of the Basement Complex which have undergone intense brittle deformation. The high-level, anorogenic, peralkaline Younger Granites of Nigeria of Carboniferous to Cretaceous age have geochemical characteristics which are similar to those of the host rocks of non-orogenic type uranium deposit in alkali complexes such as the Bokan mountains of Alaska. The sandstone type of uranium deposit may be found in the Cretaceous-Recent continental sandstone formations in the Sokoto, Niger, Chad and Benue Basins of Nigeria and in the sediments overlying the Oban Massif in Cross Rivers State. Geologically similar sandstone occurrences elsewhere in the world (Gabon, Niger and Colorado, U.S.A.) are known to harbour important uranium mineralization.
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