Document Type : Original Article
Department of Geology, Faculty of Sciences, University of Birjand, Birjand, Iran
Department of Geology, Faculty of Basic Sciences,Tarbiat Modares Uinversity
Tuyeh-Darvar mountains are located in southern flank of the eastern Alborz and due to a relatively complete stratigraphy sequences from Paleozoic to Cenozoic are a suitable location for analysis on structural evolution over the southern slope of eastern Alborz. The Giv Fault ,as the southern boundary of the mountains, is the region main thrust. The high angle Giv Fault with reverse mechanism controls the outcrop of Jurassic rocks to the south and therefore considered as the initial normal fault bounds the sedimentary basin, which underwent tectonic inversion during the Cretaceous-Paleocene. Inversion of the fault to the revers kinematics has been associated with the formation of the Mila Fault as its hanging wall back-thrust with greater reverse displacement. The tectonic inversion process of the Giv Fault has also been associated with the development of Tuye and Darvar hanging wall thruts and has caused the Tuyeh-Darvar mountains to be formed as a pop-up structure where Paleozoic units as Hanging wall anticlines thrus over younger units ones.