Microfacies study of Ilam Formation and application of geochemical studies for determination of Ilam and Sarvak boundary in Tange - E Rashidarea, Peyon Mountain, Izeh
Ilam Formation is a carbonate unit of Bangestan Group, which is overlain on Sarvak Formation with parallel discounformity in studied area. Faciese analysis indicate that, the Ilam carbonate have been formed in tidal flat, lagoon and bar environments. Six microfacies in Ilam Formation consist of, mudstone with birds eye structures, bioclast pelloidal packstone, bioclast mudstone-wackstone with bioturbation, pelloidal grainstone, ooid grainstone and intraclast ooid grainstone. Due to similar lithology between Ilam and Sarvak Formations and absence of Sourgah Formation in the study area, cause some problems to distinguish the exact boundary between these formations. In this study, major and minor element variations and carbon and oxygen isotope values used to distinguish the boundary between Ilam and Sarvak Formations in Tang- E Rashid area.