Investigation of Sequential Stratigraphy, Microfacies, Sedimentary Environment and Diagenesis Processes of Asmari Formation in Interior Fars Areas, Iran (Farashband, Sarvestan, Kalestan)

摘要

In order to study microfacies, sedimentary environment of Asmari Formation in the interior Fars areas in three stratigraphic sections including Farashband. Sarvestan and Kalestan sections were studied. In order to examine the microscopic facies and sedimentary environment of Asmari Formation, field and microscopic investigations were carried out, leading to theidentification of 13 carbonate facies in areas under study. The studies indicated that the Asmari Formation has been deposited in an Oligocene-Miocene time frame in a carbonate shelf. In addition, the study of existing microfacies revealed 5 sedimentarysub-environments including open marine, dam, lagoon shoal and intertidal zone in the Asmari Formation. Field and laboratory studies and the sequential stratigraphy evidence show that the Asmari Formation in the regions studied consisted of 2 third-orderdepositional sequences and the discontinuity in the lower boundary of the Asmari Formation with Jahrom Formation in Kalestan and Sarvestan sections have been resulted from the function of the Pyrenean orogenesis phase in these regions. The main diagenetic processes identified included micritization, dolomitization, cementation, hematitization and porosity.