Mineralogy and genesis of secondary uranium deposits, Um Ara area, south Eastern Desert, Egypt

  • Dawood Y
  • Abd El-Naby H
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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.

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  • Y. H. Dawood

  • H. H. Abd El-Naby

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