GEOLOGICAL SETTING AND RADIO ELEMENTS DISTRIBUTION IN GABAL EL RESHA-WADI EL ATRASH AREA, NORTH EASTERN DESERT, EGYPT
ABD EL-BASIT MOHAMMED ABD EL-HADI ALI;
Abstract
Gabal El Resha-Wadi El A trash area covers an area of about 414
Km2 in northern Eastern Desert, Egypt. It contains rock associations including, metagabbros, older granitoids, Dokhan volcanics, Hammamat sedimentary rocks, younger granites and post granitic dykes.
The metagabbros represent the oldest rock type in the area. These rocks are highly deforn1ed and suffered from severe alteration. Sometimes, they are found as xenoliths within the older granodiorites.
The older granitoids are represented by granodiorites. They are commonly xenolithic and cut by Dokhan volcanics and younger granites. They are characterized by their calc-alkaline nature. Their magma was generated in a compressional environment in a volcanic arc setting.
The Dokhan volcanics belong to mature island arc to active continental margin, and range in composition from andesite to dacite and their pyToclastics.
The l-lammamat sedimentary rocks are unconformably overlying the Dokhan volcanics. They consist of bedded series of conglomerates and breccias, greywackes, sandstones, siltstones and purple slates. They mostly contain pebbles of the older granitoids and the Dokhan volcanics.
The younger granites are the most predominant rocks in the area; they intrude the previously mentioned older rocks. They are classified into; monzogranites (Salaat El Atrash), syeno-to alkali feldspar granites (Hmrat El Sorwhyia) and alkali feldspar granites (G. El Resha and G. AI Hamra). The studied monzogranites are considered as !-type, they originated from peraluminous calc-alkaline, high fractionated magma. They are SY11-collision granites and formed under a compressional tectonic regime. The
Km2 in northern Eastern Desert, Egypt. It contains rock associations including, metagabbros, older granitoids, Dokhan volcanics, Hammamat sedimentary rocks, younger granites and post granitic dykes.
The metagabbros represent the oldest rock type in the area. These rocks are highly deforn1ed and suffered from severe alteration. Sometimes, they are found as xenoliths within the older granodiorites.
The older granitoids are represented by granodiorites. They are commonly xenolithic and cut by Dokhan volcanics and younger granites. They are characterized by their calc-alkaline nature. Their magma was generated in a compressional environment in a volcanic arc setting.
The Dokhan volcanics belong to mature island arc to active continental margin, and range in composition from andesite to dacite and their pyToclastics.
The l-lammamat sedimentary rocks are unconformably overlying the Dokhan volcanics. They consist of bedded series of conglomerates and breccias, greywackes, sandstones, siltstones and purple slates. They mostly contain pebbles of the older granitoids and the Dokhan volcanics.
The younger granites are the most predominant rocks in the area; they intrude the previously mentioned older rocks. They are classified into; monzogranites (Salaat El Atrash), syeno-to alkali feldspar granites (Hmrat El Sorwhyia) and alkali feldspar granites (G. El Resha and G. AI Hamra). The studied monzogranites are considered as !-type, they originated from peraluminous calc-alkaline, high fractionated magma. They are SY11-collision granites and formed under a compressional tectonic regime. The
Other data
| Title | GEOLOGICAL SETTING AND RADIO ELEMENTS DISTRIBUTION IN GABAL EL RESHA-WADI EL ATRASH AREA, NORTH EASTERN DESERT, EGYPT | Other Titles | " الوضع الجيولوجى وتوزيع العناصر الإشعاعية فى منطقة جبل الريشة – وادى الأطرش – شمال الصحراء الشرقية – مصر " | Authors | ABD EL-BASIT MOHAMMED ABD EL-HADI ALI | Issue Date | 2006 |
Attached Files
| File | Size | Format | |
|---|---|---|---|
| B10994.pdf | 468.65 kB | Adobe PDF | View/Open |
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