الفهرس 
Volcanogenic metasedimentsOnly 14 pages are availabe for public view
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Abstract
The present area comprises about 720 km2 of the Precambrian (Pan- African) belt of the south Eastern Desert of Egypt. It is convenient to review briefly the sequence of rock units and their inferred tectonic setting. The sequence of the rock units of the area under consideration and their inferred tectonic setting have been constructed as shown in Table (10.1) I fractures of the tensional environment. ’able 10.1. Rock sequence and their inferred tectonic implications. Rock unit 6-Dykes Tectonic Settings Eruption of the youngest magma in the 5-Younger granites Emplacement of post tectonic younger granite plutons during the tensional phase of the orogeny. 4-Older Granites 3-Metagab bro complex 2-Volcanogenic metasediments The ultramafic rocks and their derivatives are represented in the area Syn-to late-tectonic calc-alkaline plutonism representing intrusives of collisional subduction-related model Oceanic back-arc basins 1-Ultramafics and their derivatives. under consideration by a suite of nappes, slices and ridge-forming metamorphosed, altered and tectonically transported ophiolitic-type serpentinites thrust over the volcanogenic metasedimentary rocks on both sides of W. A1 Qulayb and W. A1 Allaqi. The petrographic studies of these rocks reveal that they comprise antigorite serpentinite, magnesite-antigorite serpentenite together with talc carbonate rocks.The type of contacts with surrouding rocks, the results of metamorphism and the mode of occurrence of these rocks indicate that these are dismembered ophiolitic sequence. Dismembered ophiolitic sequence. The studied volcanogenic metasediments occupy the major part of the present area. It occurs as irregular outcrop covering about 600 km2 in the map area. Field observation and petrographic studies reveal that, they are consist of a thick and repeatedly alternating, with a sort of accumulation, sequence of regionally metamorphosed rocks including metamudstones, metasiltstones.