Writers : M. Mohajjel;N . Proohan
Refference : Geosciences Scientific Quarterly Journal,No.:56,P.:72
Publishing Year : 1384

Abstract :
The Qom-Zefreh fault system has almost 220 km length cutting the Urumieh-Dokhtar magmatic belt in central part of Iran. According to orientation and mechanisms, it could be divided in three segments of northwest, central and southeast. Geometry and orientation of reverse faults, and folds in the Qom-Zefreh fault system and shear kinematic indicatores including Natanz slice, reflect a strike-slip displacement to the Qom-Zefreh fault. En-echelon form of the fault segments and dextral displacement resulted in a positive flower structure in two districts of south Kashan and south Ardestan. In comparison, two depressions of north Kashan depression in northwest against the south Zefreh-Gavkhoni depression in the southeast locate at the extension areas of this strike-slip fault system. Lenticular intrusive bodies including Vash granite, reflects local extension along some segments of this strike-slip fault system. The Qom-Zefreh fault is evaluated as one of the basement faults of central Iran which was reactivated by the convergent tectonics of the Neo-Tethys. Obvious displacement of most recent alluvial fans along the Qom-Zefreh fault implies high potential to seismological activity.
Subject List : Fault