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Sedimentary and tectonic evolution of the banquan pull-apart basin and implications for late Cenozoic dextral strike-slip movement of the Tanlu Fault Zone

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Science China Earth Sciences 2023年第4期66卷 797-820页

作者： Peng SHU Xiwei XU Shaoying FENG Baojin LIU Kang LI Paul TAPPONNIER Xiaojuan DENG Guihua CHEN Nuan XIA Hongtai XU Jingjing QIN Fubing HE Yan MA Rongzhang ZHENG State Key Laboratory of Earthquake Dynamics Institute of GeologyChina Earthquake AdministrationBeijing 100029China Anhui Earthquake Agency Hefei 230031China Mengcheng National Geophysical Observatory Anhui Earthquake AgencyMengcheng 233500China National Institute of Natural Hazard Ministry of Emergency Management of the People’s Republic of ChinaBeijing 100085China Geophysical Exploration Center China Earthquake AdministrationZhengzhou 450002China Seismic Hazard Mitigation Center of Shandong Province(Engineering Seismology Research Center of Shandong Province) Ji’nan 250014China Beijing Institute of Geological Survey Beijing 100195China

The banquan basin is a pull-apart basin with the largest scale and the most prominent structure due to dextral slip of the Tanlu Fault Zone(TLFZ) in late Cenozoic. The depositional history of the basin records the start time and evolution of the right-lateral strike-slip movement of the TLFZ. This paper studies the sedimentary and tectonic evolution of the banquan basin by seismic reflection exploration, borehole detection and cosmogenic nuclide chronology. We analyze the coupling relationship between the pull-apart basin and the strike-slip fault and discuss the start time and tectonic significance of the right-lateral strikeslip of the TLFZ. Our study indicates that the banquan basin has undergone three evolutionary stages: weak rifting during the pre-pull-apart period, strong extension during the syn-pull-apart period and subsidence during the post-pull-apart period. This implies that the TLFZ, which controls the evolution of the basin, experienced an evolutionary process of weak activity,intensified activity and migration of activity toward the central basin. The sedimentary filling of the basin has strong response to the episodic pull-apart and extension of the basin. Lying upon the basement of the basin, a thin layer of Miocene mudstone slowly accumulated due to local rifting before the strong pull-apart event. Along with the dextral slipping and pull-apart process, the basin was filled with alluvial fan facies, fluvial facies and floodplain facies strata from bottom to top. The latest tectonic movement of the TLFZ in the North China Block in late Cenozoic was dominated by episodic dextral strike-slip motion, and this deformation pattern started at 4.01±1.27 Ma. The latest tectonic deformation in North China since late Cenozoic was governed by eastward extrusion and tectonic orogenesis of the eastern margin of the Qinghai-Xizang Plateau since late Miocene. The eastward thrusting of the Liupanshan fault zone and sinistral shearing of the Qinling fault zone led

关键词： banquan basin Strike-slip movement Pull-apart basin Tanlu Fault Zone North China Plain Start time

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