Mineralogy and geochemistry of Nb-, Ta-, Sn-, U-, Th-, and Zr-bearing granitic rocks from Abu Rusheid shear zones,South Eastern Desert,Egypt |
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| Authors: | M. A. Ali D. R. Lentz D. C. Hall |
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| Affiliation: | (1) Nuclear Materials Authority, P.O. Box 530, El-Maadi, Cairo, Egypt;(2) Present address: Faculty of Earth Sciences, King Abdulaziz University, P.O. Box 80206, 21589 Jeddah, Saudi Arabia |
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| Abstract: | Granite-hosted, Nb-, Ta-, Sn-, U-, Th-, and Zr (Hf)-bearing mineralization from the Abu Rusheid shear zones occurs about 97 km southwest of the town of Marsa Alam, South Eastern Desert, Egypt. The SSE-trending brittle-ductile Abu Rusheid shear zones crosscut the peralkalic granitic gneisses and cataclastic to mylonitic rocks (mylonite, protomlyonite, and ultramylonite). The northern shear zone varies in width from 1 to 3 m with a strike length of >500 m, and the southern shear zone is 0.5 to 8 m wide and >1 km long. These shear zones locally host less altered lamprophyre and locally sheared granitic aplite-pegmatite dykes. |
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| Keywords: | uranium thorium zircon columbite-tantalite fluorite monazite xenotime age dating granitic gneisses South Eastern Desert Egypt |
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