Stratigraphic changes of the Seymareh Member in the southwest-northeast trend in the Lurestan structural subzone, Zagros Basin
Subject Areas :Ayoub Bazvand 1 , Mahmoud Jalali 2 * , Mohammad Hossein Adabi 3 , A.M. Jamali 4 , N. Hadavandkhani 5
1 - Ph.D student of Shahid Beheshti University
2 -
3 -
4 -
5 -
Keywords: Lopha Limestone, Gurpi Formation, Sultan Anticline, Lithostratigraphy,
Abstract :
In order to study and compare the stratigraphy of the Seymareh Member (Lopha Limestone Member) in a southwest-northeast trend in the Lurestan subzone, three stratigraphic sections of the Gurpi Formation containing the Seymareh Member, including the Sheikh-Makan section (Kabir-kuh Anticline), the Bagh-Gol section (Sultan Anticline), and the Siah-Darreh section (Zangul Anticline), were studied and then compared with other studied sections along the trend. The Seymareh Limestone has the greatest thickness in the southwestern areas of the Lurestan, so that in the studied sections, its maximum thickness is 43 meters and belongs to the Kabir-kuh Anticline, and then it gradually decreases in thickness towards the northeastern areas so that some of its rock units are no longer visible. This reduction in thickness reaches 8 meters in the Sultan Anticline, then less than 1 meter in the Zangul Anticline, and finally disappears. The decrease in the thickness of the Seymareh Member towards the northeast of the Lurestan is influenced by the tectonic movements of the Zagros foreland Basin, so that gradually towards the northeast of the Lurestan, with increasing depth, the sedimentation of this shallow member has decreased. The age of the Seymareh Member, based on the biozones identified at its lower and upper boundaris, is Middle Campanian in all three stratigraphic sections studied.