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The northern periphery of G. Gattar granites is mineralogically studied. The study area exhibits significant potential for radioactive occurrences especially in the strongly altered granites at the intersection between the basic dykes striking N300E and a sinestral strike-slip fault trending N-S. These occurrences are mostly of epigenetic origin. They are closely associated with the hydrothermal alterations; hematitization, kaolinitization and episyenitization causing marked enrichment of some elements notably, Zr, Y, Zn, Ba and REEs. The uranium occurrences vary considerably in their contents from 68 ppm to 4800 ppm, whereas the thorium contents reach up to 600 ppm especially in the desilicified granites. These radioactive occurrences may be due to the existence of some primary and secondary radioactive minerals. The primary minerals comprising uraninite and thorianite whereas the secondary ones including altered aggregated fragments of coffinite, becquerelite and gummite which were probably formed in the early stages due to uraninite dissolution. Furthermore, uranophane, kasolite, weeksite and autunite are the most conspicuous supergene uranium minerals which are mostly formed as a result of the extensive alterations of the pre-existing primary ones. The latter four minerals display mutual genetic association, hence, it is suggested that the heterogeneous hydrothermal solutions may play a crucial role in formation of the observed secondary Uminerals association in the northern part of Gattar granites pluton.

MINERALOGY OF THE RADIOACTIVE OCCURRENCE AT THE NORTHERN PERIPHERY OF GABAL GATTAR GRANITES, NORTH EASTERN DESERT, EGYPT