Petrochemical and Mineralogical Constraints on the Source and Processes of Uranium Mineralisation in the Granitoids of Zing-Monkin Area,Adamawa Massif,NE Nigeria |
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| Authors: | I V Haruna D M Orazulike A B Ofulume Y D Mamman |
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| Institution: | (1) Geology Department, Federal University of Technology, Yola, Nigeria;(2) Geology Programme, Abubakar Tafawa Balewa University, Bauchi, Nigeria;(3) Geosciences Department, Federal University of Technology, Owerri, Nigeria |
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| Abstract: | Zing-Monkin area, located in the northern part of Adamawa Massif, is underlain by extensive exposures of moderately radioactive
granodiorites, anatectic migmatites, equigranular granites, porphyritic granites and highly radioactive fine-grained granites
with minor pegmatites. Selected major and trace element petrochemical investigations of the rocks show that a progression
from granodiorite through migmatite to granites is characterised by depletion of MgO, CaO, Fe2O3, Sr, Ba, and Zr, and enrichment of SiO2 and Rb. This trend is associated with uranium enrichment and shows a chemical gradation from the more primitive granodiorite
to the more evolved granites. Electron microprobe analysis shows that the uranium is content in uranothorite and in accessories,
such as monazite, titanite, apatite, epidote and zircon. Based on petrochemical and mineralogical data, the more differentiated
granitoids (e.g., fine-grained granite) bordering the Benue Trough are the immediate source of the uranium prospect in Bima
Sandstone within the Trough. Uranium was derived from the granitoids by weathering and erosion. Transportation and subsequent
interaction with organic matter within the Bima Sandstone led to precipitation of insoluble secondary uranium minerals in
the Benue Trough. |
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