Teсtonophysical conditions of main fault activation in the Lower Amur region in the Cenozoic: Origination and evolution of conjugate basins

Abstract

The reconstruction of stress fields in the Lower Amur region allowed us to subdivide them into four groups. Two groups are related to the fields of the strike-slip fault type and others to the reverse and normal fault types. As a result of structural analysis, it has been established that the stress fields differ in age and correspond to different stages of deformation. It has been shown that origin and evolution of the Cenozoic basins in the Lower Amur region were related to the paleogeodynamics of the faults, which served as a northeastern continuation of the Tan-Lu Fault System, as well as of the NW-striking faults at the lower reaches of the Amur River. Based on the data obtained, a new model of the origin, formation, and evolution of basins in the Lower Amur region is proposed.