GEOLOGY, GEOCHEMISTRY AND RADIOACTIVITY OF WADI ABU MAAMAL AREA, NORTH EASTERN DESERT, EGYPT.
Ahmed Ali Ahmed Mohamed Abu Steet;
Abstract
The present study deals with the geology, petrography, geochemistry and radioactivity of Wadi Abu Maamal area, north Eastern Desert, Egypt.
Wadi Abu Maamal area covers about 179 km2 of crystalline basement rocks. It is bounded by latitudes 27° 09' and 27° 19' Nand longitudes 33° 15' and 33° 22' E. According to the field studies, the rock types, ofPrecambrian age, cropping out in the area are classified into: (1) Dokhan volcanics (oldest), (2) Hammamat sedimentary.. rocks, and (3) Younger granites (youngest).
Dokhan volcanics are represented by a thick sequence of stratified lava flows of intermediate to acidic composition, together with a few intercalations of pyroclastics represented mainly by tuffs with locally distributed volcanic breccia. The Hammamat sedimentary rocks are recorded at the southern part of the studied area. They are represented by bedded series of conglomerates, greywackes and siltstones. The younger granites cropping out in the area form a number of medium to relatively elevated outcrops. The younger granites contain xenolithes of different shapes and sizes from the Dokhan volcanics and the Hammamat sedimentary rocks. Dykes penetrating the m pped rock types are numerous and are variable in mineralogical composition. These dykes are distinguished into felsic and mafic ones.
The studied area displays primary and secondary structures. Primary structures are mainly exhibited in the Dokhan volcanics and Hammamat sedimentary rocks. The most common primary structures are volcanic flows, bedding, lamination, graded bedding, and ripple marks. The most common secondary structures affecting the rock types at the area of W. Abu Maamal are folds, faults, joints, foliation and sheeting.
Petrography and geochemical studies reyealed that, Dokhan volcanics could be subdiVided into intermediate (basaltic andesite and andesite) and
acidic volcanics (dacite and rhyolite). Generally, the Dokhan volcanics are
originated from calc-alkaline magma in active continental environment.
Wadi Abu Maamal area covers about 179 km2 of crystalline basement rocks. It is bounded by latitudes 27° 09' and 27° 19' Nand longitudes 33° 15' and 33° 22' E. According to the field studies, the rock types, ofPrecambrian age, cropping out in the area are classified into: (1) Dokhan volcanics (oldest), (2) Hammamat sedimentary.. rocks, and (3) Younger granites (youngest).
Dokhan volcanics are represented by a thick sequence of stratified lava flows of intermediate to acidic composition, together with a few intercalations of pyroclastics represented mainly by tuffs with locally distributed volcanic breccia. The Hammamat sedimentary rocks are recorded at the southern part of the studied area. They are represented by bedded series of conglomerates, greywackes and siltstones. The younger granites cropping out in the area form a number of medium to relatively elevated outcrops. The younger granites contain xenolithes of different shapes and sizes from the Dokhan volcanics and the Hammamat sedimentary rocks. Dykes penetrating the m pped rock types are numerous and are variable in mineralogical composition. These dykes are distinguished into felsic and mafic ones.
The studied area displays primary and secondary structures. Primary structures are mainly exhibited in the Dokhan volcanics and Hammamat sedimentary rocks. The most common primary structures are volcanic flows, bedding, lamination, graded bedding, and ripple marks. The most common secondary structures affecting the rock types at the area of W. Abu Maamal are folds, faults, joints, foliation and sheeting.
Petrography and geochemical studies reyealed that, Dokhan volcanics could be subdiVided into intermediate (basaltic andesite and andesite) and
acidic volcanics (dacite and rhyolite). Generally, the Dokhan volcanics are
originated from calc-alkaline magma in active continental environment.
Other data
| Title | GEOLOGY, GEOCHEMISTRY AND RADIOACTIVITY OF WADI ABU MAAMAL AREA, NORTH EASTERN DESERT, EGYPT. | Other Titles | جيولوجية وجيوكيميائية واشعاعية منطقة وادى ابو معيمل شمال الصحراء مصر | Authors | Ahmed Ali Ahmed Mohamed Abu Steet | Issue Date | 2002 |
Attached Files
| File | Size | Format | |
|---|---|---|---|
| B13988.pdf | 2.25 MB | Adobe PDF | View/Open |
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