Neogene stages of strike-slip deformation of the Qom sedimentary basin-Central Iran

Document Type : Original Article

Authors

1 Department of Geology, Faculty of Basic Science, Imam Khomeini International University, Qazvin, Iran

2 Department of Geology, Faculty of Science, Imam Khomeini International University, Qazvin, Iran

3 Department of Geology, Schoolof Science, Imam Khomeini International University, Qazvin, Iran

Abstract

In this paper effect of the strike-slip deformation on the Neogene structural evolution of the Qom sedimentary basin, western area of Qom city is investigated. For this purpose, after preparing geological map, structural study has been performed. Two stages of deformation are identified in the study area as the effect of NW trending strike-slip zone parallel to the Qom fault. In the first stage of deformation the main folds such as Mil and Kamarkuh anticlines and Yazdan syncline are formed and rotated counterclockwise. Then the Mill-Dochah fault and relevant sinistral fault are formed and folded. In the second stage, NNW to NW dextral strike-slip faults were initiated which in turn created restraining zone where the Mil-Dochah fault reactivated reversely and limbs of the Mil anticline were overturned. The syn-sedimentation normal folds are also reactivated normally in this stage. Sinistral and dextral strike-slip deformation of the zone is compatible with the first and second stage of deformation respectively. According to the angular unconformity that is formed as the effect of syn-sedimentation folding in the Upper Red formation, it is proposed that the age of first stage deformation is Miocene and second stage of deformation, which cut the first stage structures and reactivated the faults, is initiated in Pliocene.

Keywords

Journal of Tectonics
Volume 6, Issue 21
June 2022
Pages 53-66

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