Scientific Quarterly Journal of Geosciences

Scientific Quarterly Journal of Geosciences

Structural evolution and active tectonic of Mianrahan area, northeast of Kermanshah

Document Type : Original Research Paper

Authors
H. Javanbakht Jabarabadi 1
S. A. Alavi 2
1 M.Sc. Student, Faculty of Earth Sciences, University of Shahid Beheshti, Tehran, Iran
2 Professor, Faculty of Earth Sciences, University of Shahid Beheshti, Tehran, Iran
10.22071/gsj.2019.88498
Abstract
The studied area located at the main suture zone of Zagros in the northeastern of Kermanshah. To do structural analysis in this area, six structural sections have been drawn perpendicular to structures direction. Structures and faults with different mechanism show that the studied area has passed two tectonic phases from Cretaceous up to present. The first phase which is a Compression phase, started from Cretaceous and lasted until Miocene. The created faults in this phase are thrusts with vast displacements in which the Main Zagros Thrust is the most important one of them. The second tectonic phase which is very young and active acts as a Transpressional system. The main structures created in second phase are dextral faults of Mianrahan and Sahne. These tow faults are part of Main Recent Fault and created some secondary structures such as Dinevar pull apart and flower structure on Sahne fault. Finally structural evolution model of the area has been expressed in six steps according to the relation among the structures and layers with different ages. During these steps, faults with the same dirctions but different mechanism have been created which demonstrates the counterclockwise rotation of stress axis σ1 since Cretaceous.
Keywords
Pull apart basin
Transpresstion tectonic
Sahne fault
Mianrahan fault
Zagros suture zone
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Scientific Quarterly Journal of Geosciences
Volume 28, Issue 111
Volume 28, Issue 111, spring 2019
Spring 2019
Pages 175-184