Depositional Environment and Sequence Stratigraphy of the Pabdeh Formation in Shiraz area

Shaley Pabdeh Formation (Paleocene-Oligomiocene) expanded in Fars، Khozestan and Lorestan. Lower Lithostratigraphical limit with Gurpi Formation recognized by purple shale. Upper Lithostratigraphical limith with Asmari Formation is transitional. In order to study sedimentary environments and sequence stratigraphy of Pabdeh Formation two stratigraphic sections were chosen (Zanjiran and Shahneshin). Petrographic study indicated 9 pelagic and calciturbidite microfacies. These microfacies in deep marine deposited. Calciturbidite facies were formed during sea level highstand، when high rate of carbonate production result in transportation of carbonate sediment in deep sea. Sequence stratigraphy study shows that Pabdeh Formation consists of two depositional sequences. In Zanjiran section lower and upper contact of first sequence is type two and upper contact of second depositional sequence is conformity with unconformity. In Shahneshin section the lower contact is type two and upper contact is correlative conformity with unconformity.