GEOLOGY AND PETROGRAPHY OF MUBARAK AREA, CENTRAL EASTERN DESERT, EGYPT

Abstract

The Mubarak region is covered by two major rock units: the Island Arc Associa- tion and granitoids. This Island Arc Association is represented by metaandesite, hornblende- actinolite schist, and amphibolite, which were metamorphosed up to amphibolite facies. Granitoids are classified based on the petrographic mineral composition into two phases: the syn- to late-orogenic phase and the post-orogenic phase. According to field observations and petrographic analyses, these granitoids are magmatic rocks with isotropic texture, as opposed to the Island Arc Association, which is strongly foliated, indicating that a NW shortening occurred prior to the emplacement of the weakly metamorphosed granodiorite and the non- metamorphic post-orogenic intrusives.