New Contributions To The Geology, Geochemistry And Tectonic Setting Of The Aswan Granites, Southern Egypt

Abstract

The Aswan granitic rocks occupy a region in southern Egypt between the stable Archaean craton of the south Western Desert and the less stable Pan-African belt of the south Eastern Desert. They include light-grey medium grained granites, red coarse-grained granites and fine-grained granites. The setup, field relations and petrography of the granitic rocks are discussed in detail. Seventeen new chemical analyses for both major and trace elements are presented. Also, the chemical analyses of four biotites, four feldspars and three magnetites separated from the granitic rocks are presented and three magnetites separated from the granitic rocks are presented and plotted on variation diagrams. The field evidences indicate that the Aswan granites should be classed with the post-collisional granites, whereas the petrochemical and geochemical data suggest progressive differentiation from the granodiorite through monzogranite to syenogranite and that they are probably related to a single magmatic intrusive sequence. The Aswan granites have a related petrogenetic history with the calc-alkaline volcanic suites of the south Eastern Desert.