Writers : Lasemi,Y.; Jalilian,A.H.
Refference : Geosciences Scientific Quarterly Journal,No.:25-26,P.:48
Publishing Year : 1376

Abstract :
The Upper Cretaceous (Albian-Turonian) Sarvak Formation is a thick carbonate succession(over 800m) deposited in the southern margin of the Neotethys Ocean. Two stratigraphic sections, one in Khuzestan (Type-Section) and another in Lorestan was studied to determine its fades and paleoenvironments. Facies analysis and petrographic studies led to recognition of 12 microfacies of the open marine, shoal/barrier, shelf lagoon and tidal flat subenvironments. Vertical facies associations indicate that, the Sarvak Formation in the type section consists of two major 3rd order cycles and several small-scale cycles (parasequences). Lateral facies changes from shallow marine Sarvak Formation to deep marine Garau Formation (Neocomian- Coniacian) and the absence of clastics in the Lorestan area indicates the presence of an isolated platform to the northwest of the type section area. A rimmed shelf platform is suggested for the depositional environment of the Sarvak Formation with a slope dipping to the northwest.
Subject List : Microfacies