The combination of inclined collision and plate boundary shape can control the nature of deformation
and the sense of shear along a transpression zone. The present study investigated the effects of
a boundary zone with curvilinear shape along a transpression zone on the kinematics of deformation.
The kinematics of the Zagros transpression zone varies with the orientation of the zone boundary.
Detailed structural and microstructural studies showed sinistral sense of shear on the southeastern part
of the Zagros inclined transpression zone (Fars Arc), but dextral sense of shear on the northwestern part
of the zone. It is inferred that the both senses of shear were developed coevally under a bulk general
shear, regional-scale deformation along a curved inclined transpression miming the shape of the Fras Arc
of the Zagros and the reentrant of the Bandar Abbas Syntaxis. The Zagros transpression zone formed by
inclined continental collision between the Afro-Arabian continent and Iranian microcontinent
کلید واژگان :
Curvilinear transpression zone; SanandajeSirjan metamorphic belt; Zagros; Vorticity; General shear zone
