Abstract

The study area encompasses about 135km² located between latitudes 13° 51' 35'' and 13° 56' 20'' north and longitudes 45° 56' 40'' and 46° 04' 52'' east, within the south eastern region of Abyan Governorate, situated to the north east of Aden at a distance of 176km. The area is occupied by the geological map sheet D38 80 and D38 81. The main rock types of the intrusion includes in the series:biotite granite, monzogranite, syenogranite , rarely gneissosegranites. The petrographic, mineralogical and geochemical studies revealed that there is no considerable differences between the main massifs;suggesting that these granite massifs represent outcrops of the same magmatic origin. The massifs of As – Suwaiyda ,Am-Salaa, Al – Hamrah and Al – Hafa (um Zareb),and Am Maisam, geochemically originated from peraluminouscalc alkaline magma and considered as post– tectonic granites intruded at pressure between 1-3kb within crustal depth, greater than 30km of the lithosphere.