-

A part of Alburz Mountains which is located between Damghan plain (in the south) and Gorgan plain (in the north) structurally is a S-SE vergence thin skinned fold - thrust belt. Sequential thrusting and related folding has been the most common style of deformation since Late Triassic. Thrust faults with foreland and hinterland dipping duplex geometry show S-SE vergence and are divided in tow category 1) Cimmerides ductile thrust faults which formed during Late Triassic-early Jurassic Cimmerian collision and 2) Alpine brittle- ductile and brittle thrust faults which formed during Alpine compressional movements. Studying of minor structure in thrust sheets reveal that each thrust sheet has been formed during three stages including 1) shortening parallel to bedding, 2) folding, 3) thrusting. Direction of Maximum shortening in this region based on orientation of structures (such as fold and thrusts) has been NNW-SSE since Late Triassic due to Convergence between Iranian microplate and Turan plate during Cimmerian and Alpine orogeny.