Kinematics of a sigmoidal fold and vertical axis rotation in the east of the Zagros-Makran syntaxis (southern Iran): Paleomagnetic, magnetic fabric and microtectonic approaches

The absence of differential paleomagnetic rotation from one cross-section to the other, and the fact that the magnetic lineation together with the shortening direction deduced from microtectonic analysis follows the fold curvature demonstrate that the torsion of this fold is not secondary but rather coeval with the fold amplification. The torsion of the fold would stem from underlying inherited Mesozoic structures and the rheological response, during the deformation, of two incompetent décollement layers undergoing differential velocities and a change of thickness, in a constant stress field direction.