Microbiostratigraphy of the Oligo-Miocene Asmari Formation, Kuh Siah Anticline (Izeh Basin), SW Iran

Subject Areas : Mineralogy

Iraj Maghfouri Moghaddam ¹ , Zahra Khanjai ²

1 - Department of Geology, Faculty of Sciences, Lurestan University, Khorram Abad, Iran
2 - Department of Geology, Faculty of Sciences, Lurestan University, Khorram Abad, Iran

Received: 2016-06-05 Accepted : 2016-06-05 Published : 2014-09-23

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Abstract :

This research focusses on the biostratigraphy and paleoecological implications of the carbonatesof the Asmari Formation. The Asmari Formation is located in the Siah Kuhanticline of Izeh, Zagros Basin, SW Iran. It is of Late Oligocene (Chattian) - Early Miocene (Burdigalian) age. In this stratigraphic section, the Asmari Formation overlies the Pabdeh Formation and underlies the Gachsaran Formation. It consists of cream-colored limestone intercalated with marl. 182 thin sections were prepared and the benthic foraminifera distribution analyzed. Examination of large benthic foraminifera from the 228 m-thick Asmari Formation led to the identification of 3 biozones: the Lepidocyclina- Operculina- Ditrupa Assemblage Zone, Miogypsina-Elphidium sp. Assemblage Zone and the Borelis melocurdica- Meandropsina iranica Assemblage Zone.