郯庐断裂带浮槎山段池河-太湖断裂第四纪活动特征  

Quaternary Active Features of the Chihe-Taihu Fault on the Fuchashan Segment of the Tanlu Fault Zone

作　　者：方良好 疏鹏 路硕[1] 郑颖平[1] 解惠婷 杨源源[1] 曹均锋[1] 潘浩波[1] FANG Lianghao;SHU Peng;LU Shuo;ZHENG Yingping;XIE Huiting;YANG Yuanyuan;CAO Junfeng;PAN Haobo、(Anhui Earthquake Agency,Hefei 230031,China)

机构地区：[1]安徽省地震局,合肥230031

出　　处：《华北地震科学》2021年第3期1-6,16,共7页North China Earthquake Sciences

基　　金：中国地震局地震科技星火计划青年项目(XH20027Y);合肥市地震活断层探测及地震危险性分析项目(340100)。

摘　　要：在浮槎山西缘开展野外调查发现典型断层剖面,采集断层泥ESR年代样品,测年结果为(152±30)ka BP和(188±23)ka BP;垂直断裂布设1条浅层地震勘探测线,获得了近地表高精度浅层地震剖面。断层剖面及浅震解译结果显示,该断裂位于元古代石英岩与白垩纪砂岩之间,具有相似的构造特征,有正断分量。综合断层地貌特征、断层泥测年结果、浅层地震勘探结果及区域断裂构造对比,认为郯庐断裂带浮槎山段池河-太湖断裂最新活动时代为中更新世,但第四纪以来活动程度较弱;断裂的第四纪活动情况与其所在地的弱地震活动水平有关。In this paper,field investigation was carried out in the western margin of Fuchashan,and typical fault profiles were found.ESR dating samples of fault gouge were collected.The dating results were(152±30)ka BP and(188±23)ka BP.A shallow seismic exploration line is set up for vertical fault,which reflect the shallow structural characteristics of the fault.The fault profiles and shallow seismic interpretation results show that the fault is located between Proterozoic quartzite and Cretaceous sandstone,with similar structural characteristics and normal fault component.According to the characteristics of fault geomorphology,dating results of fault gouge,shallow seismic exploration results and regional fault structure comparison,it shows that the Chihe-Taihu fault on the Fuchashan segment of the Tanlu fault zone is a Middle Pleistocene fault,and its activity has been weak since the Quaternary.This may be a tectonic background factor mainly composed of small and medium-sized seismic activity in the study area.

关 键 词：郯庐断裂带 合肥盆地 池河-太湖断裂 ESR测年 第四纪 

分 类 号：P315.24[天文地球—地震学]