New tectonic configuration in NE Iran: Active strike-slip faulting between the Kopeh Dagh and Binalud mountains

In this paper, a combined approach of geomorphic analyses, detailed geological mapping on SPOT 5 satellite images and field surveys, complemented by radiometric dating (40Ar/39Ar) allows proposing a new and consistent tectonic configuration for the northeastern Arabia-Eurasia collision zone. It favors a simple strike-slip faulting mechanism in NE Iran accommodating the northward motion of central Iran with respect to Eurasia between the Binalud and Kopeh Dagh mountains. Our results demonstrate that similar to 2 mm/a (similar to 25%) of this northward motion has been transferred from the Binalud to the Kopeh Dagh through the Meshkan Transfer Zone since similar to 5 Ma. The modern state of stress deduced from fault kinematics analyses shows N30 degrees E trending maximum stress axis and confirms a dominant strike-slip faulting mechanism. Combining our geological data with other available data, we conclude that kinematics of deformation can be appropriately described by rigid block faulting in NE Iran; instead, the continuous deformation as it has been thought during the last 3 decades. Citation: Shabanian, E., O. Bellier, L. Siame, N. Arnaud, M. R. Abbassi, and J.-J. Cocheme (2009), New tectonic configuration in NE Iran: Active strike-slip faulting between the Kopeh Dagh and Binalud mountains, Tectonics, 28, TC5002, doi: 10.1029/2008TC002444.