Abstract:

Bonan depression is a complex basin formed during Mesozoic and Cenozoic. It is steep in north slope and gentle in south slope, which is controlled by listric faults. The balanced section technique is used to study its sedimentation and subsiding. It is indicated that the depression is not a sample extension structure, and the reverse structures were existed in different evolution stages. The intensive extension and weak compression were alternatively occurred during its evolution. The heaved blocks around the basin and the boundary faults controlled the deformation and sedimentation of the depression.

Key words: Bonan depression, balanced section, reverse structure, basin evolution