Oligocene stratigraphy of the Northern Subcoastal Fars Zone (Tang-e-Khoshk, Zagros structures, Iran): Biostratigraphy and Paleoenvironment
سال انتشار: 1394
نوع سند: مقاله ژورنالی
زبان: انگلیسی
مشاهده: 381
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شناسه ملی سند علمی:
JR_IJABBR-3-1_022
تاریخ نمایه سازی: 26 اسفند 1394
چکیده مقاله:
Objective: The Asmari Formation is characterised by alternation thick carbonate and marl sequence of the Oligocene- Miocene in the Zagros Basin, southwest of Iran that were deposited on the shelf of Eastern Paratethys. Methods: This formation is exposed at Tang-e-Khoshk in the Fars subcoastal zone with a thickness of 286 m comprising alternation of medium and thick to massive bedded carbonates, marlylimestone and marl. The age of the Asmari Formation in the study area is the Oligocene (Ruplian&Chattian). Results: Ten microfacies are defined, characterizing a gradual shallowing upward trend; the related environments are as follows: open marine (MF1, 2&3), shoal (MF4) and lagoon (MF5, 6&7). A carbonate ramp platform is suggested for the depositional environment of the Asmari Formation. MF 1, 2, 3 &4 are characterized by the occurrence of large and small foraminifera representing a represent a deeper fair weather wave base of a middle ramp setting. MF 5, 6& 7 with large particles of different bioclast debis and algae, shallow-water setting of an inner ramp
کلیدواژه ها:
Tang-e-Khoshk ، Asmari formation Oligocene Biostratigraphy Carbonate ramp
نویسندگان
Azam Zare
Paleontology and Stratigraphy cultural heritage and handy craft organization and department of Geology, Payame-Noor University، Fars, Shiraz, Iran
Afshin Hashmie
Sedimentology and Sedimentary Petrology, Absakht hashemi Company, Fars, Shiraz, Iran