LATE CENOZOIC BLOCK- ROTATION AND OROCLINAL BENDING IN NORTH AND CENTRAL IRAN
In order to define the pattern of vertical axis rotations associated to the Arabia-Eurasia shortening, new paleomagnetic data from Miocene units from the different tectonic blocks of Central Iran and from the curved orogenic belts from northeastern Iran (Central and Eastern Alborz Mts.) have been collected. In north-eastern Iran a general correspondence between the orientation of the different sectors of the curved orogen which comprises the Central and Eastern Alborz Mts. and the trend of paleomagnetic rotations was observed. This correspondence suggests that oroclinal bending is a valuable mechanism to explain the present-day curvature of these orogenic belts. In Central Iran, CCW paleomagnetic rotations have been measured in the Yazd and Tabas block, which are characterized by N-S to NNW-SSE oriented right-lateral strike-slip faults, whereas CW paleomagnetic rotations have been measured in areas where E-W oriented left-lateral strike-slip faults are predominant (e.g. Ferdows area in the Lut block) and Torud and Jamdag area north of the Great Kavir fault. Accordingly, vertical axis rotations could have accommodated a significant portion of N-S shortening related to the Arabia-Eurasia convergence during the Tertiary.