Effect of the Perpendicular Faults Interaction on the Rag Sefid and Tango Folds Evolution (SW Iran)

Document Type : Original Article

Authors

1 Department of Geology, Faculty of Science, University of Birjand, Birjand, Iran

2 University of Birjand,

3 Parsian Kish Drilling Company (PKD Co)

10.48308/esrj.2022.102264

Abstract

In the South Dezful Embayment, due to the sequence of the Zagros deformation phases and the tectonic inversion occurrence in the Rag Sefid thrust fault, as well as the reactivation of the Hendijan-Izeh fault, there has been a prependicular interaction in these faults that caused an important effect on the structural pattern of folding in the Rag Sefid and Tango anticlines. Regarding the length more than 3 times of the Rag Sefid fault respect to the southern part of the Hendijan-Izeh strike-slip fault, the mean slope of 47 degrees of the Rag Sefid fault relative to the Hendijan-Izeh fault of 80 degrees and according to the general compression direction of N22E in the Southwest of Iran and the southern part of the Henijan-Izeh fault trend (N20E), as well as the Rag Sefid fault trend, which is approximately perpendicular to the general compression direction, the deformation amount of the Rag Sefid fault is more than the Hendijan fault. In this condition, the stress field of the Rag Sefid thrust fault is dominated and due to the less resistance of the rising, folding with a larger amplitude occurs on the the Rag Sefid anticline; so that the folding amplitude in the Rag Sefid anticline is more than twice as large as the Tango anticline, and the tip of the Tango anticline is about 1,200 meters lower than the Rag Sefid anticline.

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