Palaeoecology and Biostratigraphy Asmari Formation in Kooh-Siah anticline (north of Dehdasht) and correlation with the other parts of Zagros basin

رخساره‌های رسوبی

Article 3, Volume 8, Issue 1, December 2015, Pages 43-58   

Document Type: مقالات پژوهشی

DOI: 10.22067/sed.facies.v8i1.23381

Authors

Mojgan Zare^{* 1}; Hossain Vaziri moghaddam²; Azizolah Taheri³; Ali Ghabeishavi⁴

¹M.Sc in Stratigraphy & Paleontology, Department of Geology, Faculty of Sciences, University of Isfahan, Isfahan, Iran

²Professor, Department of Geology, Faculty of Sciences, University of Isfahan, Isfahan, Iran

³Professor, Geology Department, Faculty of Earth Science, Shahrood University of Technology, Shahrood, Iran

⁴National Iranian South Oil Company (NISOC), Ahwaz, Iran

Abstract

In this research biostratigraphy and paleoecology of the Asmari Formation in Kooh-Siah anticline (north of Dehdasht) has been studied. The thickness of the Asmari Formation in this section is 214.1m and consists of thick, medium and thin bedded limestones. This study led to identification 23 genera and 20 species of benthic foraminifera. Based on the distribution of foraminifera 3 assemblage zones with ages upper Chattian, Aquitanian and Burdigalian were recognized. Faunal associations indicate that the Asmri Formation in the study area was deposited under tropical and oligotrophic conditions that it is accordance with photozoanassociation. The zooaxanthellate corals were not able to build three-dimensional wave-resistant structures up to sea level, therefore, heterozoan association were developed. Faunal association shows that the Asmari Formation was deposited in water with variety of salinity (normal to hyper-saline conditions).

Keywords

paleoecology; Biostratigraphy; Benthic foraminifera; Asmari Formation

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