Structural Study and Influence of Thickness Change in the Qom Formation on Geometry of the Structures, Dokhan Area, West Saveh

The marine facies of the Qom Formation was deposited between two detritus continental facies of the Lower and Upper Red Formations. The type section of the Qom Formation was observed in Qom city, but its most thickness has been reported from the Dokhan area in west Saveh. Stratigraphic studies revealed that its thickness has sudden changes in the Dokhan area through short distances. Geometry of the structures was strongly influenced by change of thickness in different rocks of the Qom Formation. The main question that has been answered in this study is what caused change of thickness in short distances. The geometry and kinematic observations of the major faults in the Dokhan area showed that their displacement style during sedimentation influenced on change of the thickness and folding style during deformation of the Qom Formation. This study showed that the Dokhan area is located in the extension termination of the NW-SE trending major strike-slip faults such as the Tafresh, Talkhab and Indus faults.