Abstract: Dayangshu Basin is a Mesozoic-Cenozoic basin which is located on the east part of Daxing’anling orogenic belt. It is in a long narrow shape with the NNE trending and next to Songliao Basin to the east. Dayangshu Basin experienced multistage deformations, which is characterized mainly by extensional structures, and was superimposed by compressional structures and positive inversion structures. The basin was suffered NWW-SEE extension during Longjiang stage of the Early Cretaceous, a series of listric normal faults was formed, and the half-grabens were developed on the hanging wall of the controlling fault. Dayangshu Basin was controlled by NW-SE compression during Jiufengshan stage of the Early Cretaceous, the early faulted depressions were inversed by contraction to form inversion structures, and fault propagation folds and thrust faults were formed in some places. Dayangshu Basin was suffered extension again during Ganhe stage of the Early Cretaceous, a series of small NNE trending fault depressions formed. Dayangshu Basin was suffered intensive compression during late stage of the Early Cretaceous to early stage of the Late Cretaceous, and the early depression-controlling normal faults were inversed, and fault propagation folds formed on the upper part of the basin. The basin was raised completely and suffered erosion. Dayangshu Basin was in extensional setting in the Quaternary period, and a series of small extensional half-grabens were formed.

Key words: structural feature, deformation stage, extensional structure, inversion structure, fault propagation fold, Dayangshu Basin