The control of tectonic activities on sedimentation in Tangyuan fault depression basin

Located in the north of Hei Longjiang province, Tan-gyuan fault depression basin is a secondary tectonic unit in the most northern part of Yi - shu graben and belongs to a Cenozoic fault depression basin. A study in the basin indicated the sedimentary cycle was under the control of tectonic activities. On one hand, the boundary of tectonic e-volution stages matched the classification of sedimentary cycles, making a positive cycle and a reverse cycle as a whole; on the other hand, the sedimentary area was cut apart because of the stages of faulting activities, and the weaker the faulting activities was, the more unified the sedimentation. At the same time, the sedimentation of basin floor fan was mainly formed in the strong stage of faulting activities. At stable faulted stage, however, it demonstrated as fan - delta sedimentation. In one word, the sedimentation in Tangyuan fault depression basin was obviously controlled by tectonic activities.