kpeh - dagh沉积盆地Abtalkh组浮游有孔虫生物地层学及三东系/坎帕系界线的确定

Pub Date : 2021-03-31 DOI:10.29041/STRAT.18.1.03

M. S. Ardestani, M. Youssef, M. Vahidinia

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引用次数: 0

摘要

摘要/ ABSTRACT摘要:对科佩-达格沉积盆地5个露头(Sheikh、Hajgelichkhan、Qarehso、Muzduran和Deraz-Ab)的Abtalkh组进行了研究。共发现浮游有孔虫30种，隶属21属。利用这些物种将Abtalkh组划分为7个生物带(Dicarinella asymetrica带、Globotruncanita elevata带、Contusotruncana plummerae带、Radotruncana calcarata带、Globotruncanella havanensis带、Globotruncana aegyptiaca带和Gansserina gansseri带)。Abtalkh组沉积于晚圣东—晚坎帕纪，根据Dicarinella不对称的最后一次产状，确定了圣东—坎帕纪界线。坎帕尼亚期的基础是由边缘truncanid类群的灭绝、nuttalli Pseudotextularia nuttalli和Rugoglobigerina rugosa的首次出现和Dicarinella asymetrica的最后出现确定的。

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Biostratigraphy of planktonic foraminifera in the Abtalkh Formation and determination of the Santonian/Campanian Boundary in the Kopeh-Dagh Sedimentary Basin

ABSTRACT:We studied the Abtalkh Formation from five outcrops (Sheikh, Hajgelichkhan, Qarehso, Muzduran, and Deraz-Ab) in the Kopeh-Dagh sedimentary basin. A total of 30 species of planktonic foraminifera belonging to 21 genera were recorded. These species were used to subdivide the Abtalkh Formation into seven biozones (Dicarinella asymetrica Zone, Globotruncanita elevata Zone, Contusotruncana plummerae Zone, Radotruncana calcarata Zone, Globotruncanella havanensis Zone, Globotruncana aegyptiaca Zone, and Gansserina gansseri Zone). The Abtalkh Formation was deposited during the late Santonian-latest Campanian and the Santonian-Campanian boundary is identified based on the last occurrence of Dicarinella asymetrica. The base of the Campanian stage was delineated by the extinction of the marginotruncanid group, the first occurrences of Pseudotextularia nuttalli and Rugoglobigerina rugosa, and on the last occurrence of Dicarinella asymetrica.

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