• الصفحة الرئيسية
  • Microbiostratigraphy of upper Cretaceous deposits (Bangestan Group) in the northwestern flank of Sepid Kuh anticline, W Iran

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عنوان URL للمقالة


رقم المقالة : IJES-1608-1042 (R3) زيارة : 156 الصفحة: 179 - 187

10.30495/ijes.2022.521332.1042

نوع المخطوط: ابحاث

Microbiostratigraphy of upper Cretaceous deposits (Bangestan Group) in the northwestern flank of Sepid Kuh anticline, W Iran

الموضوعات :

Iraj Maghfouri Moghaddam 1 (Geology Department, Faculty of Science, Lorestan University, Lorestan, Iran)
Keyvan Khaksar 2 (Department of Experimental Science, Qom Branch, Islamic Azad University, Qom, Iran)
Ghamarnaz Darabi 3 (Geology Department, Faculty of Science, Lorestan University, Lorestan, Iran)
Zahra Rahomo rokrok 4 (Geology Department, Faculty of Science, Lorestan University, Lorestan, Iran)
Ziba Besharati 5 (Geology Department, Faculty of Science, Lorestan University, Lorestan, Iran)

تاريخ الإرسال : 25 الإثنين , ذو الحجة, 1437 تاريخ التأكيد : 01 الجمعة , شعبان, 1443 تاريخ الإصدار : 13 السبت , ذو الحجة, 1444

الکلمات المفتاحية: Lorestan Zone, Sepid Kuh, Bangestan Group, Santonian, Senomanian,

ملخص المقالة :

The benthic and planktonic foraminiferal contents of the Bangestan Group (Sarvak, Surgah and Ilam formations) in the Sepid Kuh anticline in the Lorestan Zone, W Iran, were studied. Bangestan Group consists of limestone, argillaceous limestone, dolomitic limestone and marl with thickness of 5400 m. In this section Bangestan Group overlies Garu Formation disconformably and its upper boundary is not exposed. By micropaleontological study on 176 thin sections, 8 genus and 34 species planktonic foraminifera were identified. 400 m of Sarvak Formation has very little fossil diversity that does not indicate a certain age. For this reason, this interval was called the indeterminate zone, which due to its stratigraphic position, is probably of Cenomanian age. Based on the biostratigraphical range of planktonic foraminifera distinguished, four biozones can be identified: Helvetoglobotruncana helvetica Total Rang Zone (Early- Middle Turonian), Marginotruncana schneegansi partial Range Zone (late Turonian), Diacarinella concavata Interval Zone (Coniacian), and Diacarinella asymetrica Total Zone (Santonian).

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