FENG Z D, TAN H L, WU W,et al.Influence of dextral strike-slip movement of Tanlu fault zone on the tectonics evolution of Dongpu Depression[J].Journal of Henan Polytechnic University(Natural Science) ,2023,42(5):72-79.

doi:10.16186/j.cnki.1673-9787.2021060022

Received:2021/06/04

Revised:2021/08/28

Published:2023/09/25

Influence of dextral strike-slip movement of Tanlu fault zone on the tectonics evolution of Dongpu Depression

FENG Zhendong1, TAN Haolin1, WU Wei2, WANG Guangxu2, LIU Weiqing2, WEI Guoying1, JIA Tianrang1

1.College of Safety Science and Engineering，Henan Polytechnic University，Jiaozuo  454000，Henan，China;2.Institute of Resources & Environment，Henan Polytechnic University，Jiaozuo  454000，Henan，China

Abstract:The direction of the Pacific plate subduction changed，which caused the change of the Tanlu fault from sinistral to dextral strike-slip.The various depressions in the east of the Bohai Bay Basin clearly responded to this tectonic event.Whether the Dongpu Depression in the west of the basin was affected by it and to what extent，its conclusions directly affected the formulation of the seismic interpretation scheme in this area. Combining 3D seismic and deep geophysical data，the basin-controlling characteristics of the Lanliao fault were analyzed.According to the evolution of the en-echelon fault assemblage with regional chronological data，the coupling relationship between the en-echelon assemblage and regional tectonic activity was discussed.Through the statistics of the strikes of low-order fault，the characteristics of the stress field in the Cenozoic in this area were clarified.The analysis results showed that the western branch of the Lanliao fault was the key fault that controled the overall structure of the Dongpu Depression；the formation time of the en-echelon fault assemblage was poorly coupled with regional dextral strike-slip；the Paleogene stress field in the Dongpu Area was stable，and there was no obvious difference before and after the change of plate subduction direction.It was proposed that extensive stress was the main driving force of Dongpu Cenozoic tectonic evolution，and the dextral torsional stress had limited influence on the tectonics of this area.

Key words:Dongpu Depression;border fault;en-echelon assemblage;variation of stress;dextral strike-slip;

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