Biostratigraphy and Depositional Environment of the Asmari Formation in Murdak Region (Northeastern of Kazerun)

Abstract

The Asmari Formation is well– exposed at Murdak region at northeast of Kazerun. The true thickness of Asmari Formation reaches to 385m. This formation consists of massive limeston, thick and thin bedded. The Asmari Formation is gradually overlying the Pabdeh Formation. The top of Asmari Formation is covered by Gachsaran Formation. The 8 microfacies in 4 facies belts (Littoral Coast), Lagoon, Patch reef, Continental slop) are distinguished and formed at carbonate platform environment. Because of turbidite lack and organic structures, these facies correspond to carbonate ramp setting. Tow assemblage biozones were recognized in this formation, and consist of: Eulepidina dilatata – Nummulites vascus Assemblage Zone, and Austrotrilina– Miogypsina– Peneroplis Assemblage Zone. Therefore, based on these assemblage biozones, the Asmari Formation is assigned to late Oligocene– early Miocene.

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References

منابع
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