Microfacies, sedimentary environment and sequence stratigraphy of Asmari Formation in North Western of Charam, Kohgilooyeh and Boyer Ahmad Province, Iran

Abstract

The Asmari Formation is a thick carbonate sequence in the foreland Zagros Basin that was deposited during the Early Oligocene-Miocene. The Asmari Formation in North Western of Charam, Kohgilooyeh and Boyer Ahmad province was studied in terms of microfacies, sedimentary environment, and sequence stratigraphy. The upper boundary of the section is overlain by the Gachsaran Formation and lower boundary is overlain by the Pabdeh Formation. The studied section consists of limestone, marly limestone, shaly limestone, and intercalated of limestone, shaly and marl. Eighteen microfacies have been recognized. The study of allochemical, terrigenous, and orthochemical elements, Infers that the different sedimentary sub-environments  tidal flat, lagoon, barrier, and open marine for Asmari Formation. The Asmari Formation was deposited in on a ramp-type carbonate platform. Three complete sedimentary sequences and one incomplete sedimentary sequence were recognized.