MICROFACIES AND PALAEOENVIRONMENTS OF THE LOWER CARBONIFEROUS MOBARAK FORMATION IN THE SEYED ABAD SECTION,CENTRAL ALBORZ MOUNTAINS, IRAN

Carboniferous rocks outcrop over vast areas in the Alborz Mountains. The Mobarak Formation outcrops in the studied area near the Damavand town, North-east of Tehran, Northern Iran. The petrographic study produced the recognition of sixteen different microfacies types. Based on microscopic studies,Three facies belts have been characterized: (1) a lagoonal facies belt, (2) a barrier (shoal) facies belt and (3) an open-marine facies belt. Facies of Mobarak Formation in this section deposited in a distally steepened ramp in beginning and deposited in a Rimmed Shelf in continuation.