College of Earth Sciences, Jilin University, Changchun 130061, China

A series of strike-slip thrust faults were found in Yehe of Siping, exhibiting features of flat and steep-dipping fault planes with strikes ranging from NNE15°~35° and distributing in an echelon pattern. These faults form the branch faults between the two major boundary faults of Jiamusi-Yitong. The branch faults intersect the major faults with striking of NE 45° at an acute angle, indicating that the boundary faults have a dextral strip slip characteristic. The discovery of the strike-slip thrust fault zone in Yehe provides a new evidence for the strike-slip thrust event during late-end Late Cretaceous in the Jiamusi-Yitong fault. Yehe branch fault zone is the southern extension of the Shiling branch fault zone. Intersecting same strata, possessing identical structural characteristic and tectonic attribute and belonging to one strike-slip thrust system, the two fault zones are produced in the same geodynamic background in the late-end Late Cretaceous.