الفهرس 
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Abstract
The area which forms the subject of the present study, lies within the basement complex of the central southern Sinai of Egypt and covers about 448 sq. km. The area is formed mainly of high mountainous country rising up to spot levels of 2265 m. The area under investigation is mostly covered by a group of granitic rocks including biotite granites, granophyres, leucocratic granites and riebeckite granites. Quartz diorites and quartz monzonites are rather rare and occupy minor occurrences in the southern part of the district. The quartz diorites, quartz monzonite and granites are disected by a series of acid, intermediate and basic dykes.