Document Type : Original Research Paper
Authors
Department of Geology, Faculty of Basic Science, Tarbiat Modares University, Tehran, Iran.
Abstract
High Zagros zone in southeast Kermanshah is bordered between two Radiolarite and Zagros Fold Belt and consist of abundant NW-SE trending thrust faults and folds sub-parallel to Zagros fold belt. Several structural cross-sections were prepared in NE-SW direction perpendicular to the trend of the structures. Main thrusts were cut by some local strike-slip faults due to difference in their displacement. The Kohsefid thrust fault (FA) is one of the main thrusts that divide the northern Radiolarite zone from the High Zagros Zone. This fault is limiting the southern boundary of the Radiolarite zone. It displaced as a reverse fault during contraction tectonic in Late Cretaceous. The flysh facies of Amiran formation in Zagros Fold Belt with Paleocene age contain radiolarite fragments and confirms this event. It seems that the Garo Formation plays a detachment surface role for these thrusts in the High Zagros zone. The foreland in Zagros, commenced to deform by thrusting and folding in Late Cretaceous in the High Zagros zone and by later collision of the Arabian plate with the Iranian plate, rock units in the Zagros Fold Belt were deformed.
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