Microfacies, sedimentary environment and sequence stratigraphy of Asmari Formation in North Western of Charam, Kohgilooyeh and Boyer Ahmad Province, Iran

Iranian Journal of Earth Sciences

مقالات آماده انتشار، پذیرفته شده، انتشار آنلاین از تاریخ 26 اردیبهشت 1402

نوع مقاله: Original Research Paper

شناسه دیجیتال (DOI): 10.57647/j.ijes.2024.1602.11

نویسندگان

Behzad Saeedi Razavi^{* 1}؛ Saeedeh Senemari²

¹Research Assistant Professor -Construction and Minerals Research Group, Technology and Engineering Research Center, Standard Research Institute (SRI), Karaj, Iran

²Department of Geology, Imam Khomeini International University, Qazvin, Iran

چکیده

The Asmari Formation is a thick carbonate sequence in the foreland Zagros Basin that was deposited during the Early Oligocene-Miocene. The Asmari Formation in North Western of Charam, Kohgilooyeh and Boyer Ahmad province was studied in terms of microfacies, sedimentary environment, and sequence stratigraphy. 145 thin sections have been prepared and analyzed. The upper boundary of the studied section is overlain by the Gachsaran Formation and lower boundary is overlain by the Pabdeh Formation. The studied section consists of limestone, marly limestone, shaly limestone, and intercollection of limestone, shaly and marl. Also, 18 microfacies have been recognized. According to studies of allochemical, terrigenous, and orthochemical elements, four different sedimentary sub-environments as following in order introduced; tidal flat, lagoon, barrier, and open marine for Asmari Formation. The Asmari Formation was deposited in on a ramp-type carbonate platform. During detailed stratigraphic studies performed on the Asmari Formation in the studied section, three complete sedimentary sequences and one incomplete sedimentary sequence were determind.

کلیدواژه‌ها

Microfacies؛ Sequence stratigraphy؛ Asmari Formation؛ Sedimentary environment؛ Carbonate platform