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| Article Name : | | | GEOLOGY AND RADIO-ELEMENT POTENTIALITIES OF SOME SELECTED ACID VOLCANIC ROCKS, CENTRAL EASTERN DESERT, EGYPT | | Author Name : | | | Imbarak S. Hassen , Ali Abu-deif , Abd el Aziz Abd el Warith , Atta abed El shafy and Osama K. dessouky | | Publisher : | | | Ashok Yakkaldevi | | Article Series No. : | | | ROR-675 | | Article : | |  | Author Profile | | Abstract : | | | The silicic Dokhan Volcanic rocks of Gabal Nuqara and Gabal Abu Aqarib occupy an area of the Central Eastern Desert, SSW of Safaga city, Egypt. The silicic volcanics of G. Nuqara crop out in two elongate parallel NW-SE trending belts, and are conformably overlain by the intermediate Dokhan Volcanics. The accumulation of the volcanics in belts is not probably consistent with a central (volcanic neck) eruption. The silicic Dokhan Volcanics of G. Abu Aqarib show explosive eruption products giving rise to thinly banded rhyolitic tuffs at the top of the volcanic sequence. G. Nuqara volcanics include rhyolite porphyry, rhyodacite, dacite and equivalent pyroclastics, and G. Abu Aqarib volcanics are rhyolite porphyry, rhyodacite and equivalent pyroclastics. The Dokhan Volcanic (both of G. Nuqara and G. Abu Aqarib) have calc-alkaline affinity with alkali enrichment. They were erupted in a volcanic arc in an active continental margin tectonic setting. The average eU contents of the silicic volcanic rocks of G. Nuqara and G. Abu Aqarib are 9.4 and 8.5 ppm, respectively. Because of the relatively low average content of uranium, visible U mineralization is absent. Uranium is present as a trace in accessory resistate minerals (e.g apatite and zircon). | | Keywords : | | |
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