Geometric Analysis of Tukak and Kamarun Anticlines in Izeh Zone, Zagros

Situated 15 km NW of the Izeh city, Tukak and Kamarun anticlines are located in northwest of the Izeh zone in the Zagros fold-and-thrust belt. The Tukak anticline measures about 17 km length by 3.3 km width on the Asmari formation outcrop, while the Kamarun anticline shows a maximum length and width of about 15 km and 3.5 km, respectively, on the same formation. The SE termination of the Kamarun anticline and the NW termination of the Tukak anticline form together an en-echelon array. Both anticlines represent nearly symmetrical box-fold geometry, in which the Pabdeh formation is the oldest outcrop in each anticlinal core and the Asmari formation constitutes most of their surface outcrop. Based on surface geology, 4 cross-sections across the Tukak anticline and 3 cross-sections across the Kamarun anticline (D-D' is a common section crossing the en-echelon plunges), and one longitudinal section through both structures were constructed. Since the Bangestan horizon is taken to indicate a position upper than sea level, the cross-sections were used to construct the UGC map on the Upper Khami horizon. In Tukak anticline, which is bigger than the Kamarun anticline, the UGC map of the Upper Khami horizon illustrates vertical and horizontal closures of 250 m and about 4.3 km2, respectively.