Secondary U mineralisation is found in the oxidised zone pervading fractured albitised and alkali-feldspar granites emplaced at the northern boundary of Um Ara Pluton. It occurs as stains along crevices and fracture surfaces and as acicular crystals filling cavities. X-ray diffraction and SEM were used to identify secondary U minerals and the associated alteration products. Uranophane and β-uranophane are the most abundant U minerals, whereas Ca-montmorillonite and illite represent low temperature alteration products of the host granitic rocks. The genesis of secondary U minerals is mainly attributed to the action of oxic groundwater on previously corroded primary U minerals. These secondary U minerals were deposited near the surface from the circulating groundwater by evaporation. © 2001 Elsevier Science Limited. All rights reserved.
CITATION STYLE
Dawood, Y. H., & Abd El-Naby, H. H. (2001). Mineralogy and genesis of secondary uranium deposits, Um Ara area, south Eastern Desert, Egypt. Journal of African Earth Sciences, 32(2), 317–323. https://doi.org/10.1016/S0899-5362(01)90009-0
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