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

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 

机构地区：[1]State Key Laboratory of Earthquake Dynamics,Institute of Geology,China Earthquake Administration,Beijing 100029,China [2]Anhui Earthquake Agency,Hefei 230031,China [3]Mengcheng National Geophysical Observatory,Anhui Earthquake Agency,Mengcheng 233500,China [4]National Institute of Natural Hazard,Ministry of Emergency Management of the People’s Republic of China,Beijing 100085,China [5]Geophysical Exploration Center,China Earthquake Administration,Zhengzhou 450002,China [6]Seismic Hazard Mitigation Center of Shandong Province(Engineering Seismology Research Center of Shandong Province),Ji’nan 250014,China [7]Beijing Institute of Geological Survey,Beijing 100195,China

出　　处：《Science China Earth Sciences》2023年第4期797-820,共24页中国科学（地球科学英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.41941016,U1839204&41802224);the National Institute of Natural Hazard,MEMC(Grant No.ZDJ2019-19);the Independent Developing Project from the Institute of Geology,China Earthquake Administration(Grant No.F-18-04);the Joint Open Fund of Mengcheng National Geophysical Observatory(Grant Nos.MEMGO202215&MEMGO-202214);the Spark Program of Earthquake Sciences from China Earthquake Administration(Grant No.XH19017Y)。

摘　　要：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 to the anticlockwise rotation and pushing of se

关 键 词：Banquan Basin Strike-slip movement Pull-apart basin Tanlu Fault Zone North China Plain Start time 

分 类 号：P534.6[天文地球—古生物学与地层学] P542[天文地球—地质学]