Thesis (Ph.D.) - Cairo University - Faculty of Science - Department of Geology

Gabal Abu Hamr area is located at the North Eastern Desert of Egypt between latitudes 26{u00B0}50' - 26{u00B0}53' N and longitudes 33{u00B0}25' - 33{u00B0}30' E. It is formed of G. Abu Hamr pluton, which is an elongated granitic mass intruded into voluminous Pan-African country rocks (metasediments, metavolcanics, diorite, gneissic tonalite, granodiorite and monzo-granite) along the E-NE shear zone known as Qena-Safaga shear zone. Mineralogically this pluton is hypersolvus composed mainly of perthite, quartz, arfvedsonite and late aegerine with accessories sphene, rutile, allanite, ilmenite and zircon. Its mineralogical and geochemical traits are typical of the within-plate A-type suites. However, some petrographical and chemical parameters clearly indicate that this granite has been affected by hydrothermal metasomatism (e.g. depletion of Zr). Along the late Devonian ENE-WSW major fault, hydrothermal solutions caused the metasomatism of G. Abu Hamr arfvedsonite granite and led to the leaching of Zr, U and HREEs and their escape into the fluids, which were transported through the structure systems (NNE-SSW) and concentrated along the tectonic contact between the granite and the metavolcanics. Along the tectonic contact between the granite and the metavolcanics, uranium and molybdenum mineralizations were detected. The identified minerals are uraninite, uranophane, kasolite, molybdenite, powellite, iriginite and tengchongite; associated with Zircon, Fluorite, Pyrite and Galena. The suggested age of the emplacement of this pluton is ranging from 550 Ma to 450. G. Abu Hamr arfvedsonite granite can be considered as one of the A-type anorogenic peralkaline granites present in the Eastern Desert of Egypt

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