Facies distribution, depositional environment, and diagenetic features of the Permian Jamal Formation, Central Iran basin

Abstract

The Permian Jamal Formation characterized as one of the most significant successions in the Central Iran basin and constitutes a thick section (as much as 180 m) of limestone, dolomitic limestone, and dolomite in southeastern Kharu village in Tang-e Sarve area. The facies analysis of Jamal Formation leads to the identification of 11 microfacies, which are attributable to shoal, lagoon, and tidal flat environments. Results from petrographic evidence as well as facies analysis demonstrate that the depositional environment of Jamal Formation in the studied area (Kharu village, East Tabas) exhibits the characteristics of a homoclinal carbonate ramp platform with the gentle slope. This platform is mainly composed of tidal flat, lagoon, and shoal sub-environments. According to facies frequency analysis, the lagoon environment accounts for the highest abundance of facies (48%), whereas tidal flat environment shows the least abundance (17%). Bioturbation, micritization, cementation, dolomitization, neomorphism, physical and chemical compaction, and fracturing are the most important diagenetic features.