?HASHAD, A.H. and EL REEDY, M.W.M. 1979. Geochronology of the anorogenic alkalic rocks, South Eastern desert, Egypt. Annals of the Geological Survey of Egypt, 9: 81-101.MOHAMED, F.H. 1996. Geochemistry of Bir Um Hibal complex: alkaline syenites and granite?. 1979.