煤田地质与勘探2023，Vol.51Issue(12)：47-56,10.DOI:10.12363/issn.1001-1986.23.10.0677
苏南溧阳-南渡断裂活动性研究
Activity of the Liyang-Nandu fault in Southern Jiangsu
摘要
Abstract
Located in the central part of the Sunan Modernization Construction Demonstration Area-one of the areas with the densest population and urban areas and the most developed economy in China,the Liyang-Nandu fault is an im-portant concealed fault with a nearly E-W strike in the Yangtze River Delta in eastern China.This fault serves as an im-portant regional geomorphic and neotectonic boundary.However,there is a lack of systematic research on this fault,and its latest activity era is yet to be ascertained.Using seismic exploration P-waves and S-waves and cross-well stratigraph-ic correlation,this study investigated the spatial distribution and Quaternary activity of the Liyang-Nandu fault and ex-plored its multiphase tectonic activity and seismicity.The results are as follows:(1)The western and central-eastern seg-ments of the Liyang-Nandu fault have dip directions of north and south,respectively,suggesting the nature of a normal fault.Their dip angles range from 64° to 84°.(2)This fault evidently offsets the intervals above at burial depths of ap-proximately 70 m,with vertical activity difference affecting the parts at depths of about 36-45 m underground.The com-prehensive analysis revealed that this fault should be a Quaternary Early-Middle Pleistocene fault,with the latest activ-ity occurring after approximately 310±54 ka,predating the Late Pleistocene.(3)This fault has undergone multi-stage activity.From the Indosinian to the Early Yanshanian,it was present as a reverse fault.Since the Late Yanshanian,it has been a normal fault,controlling the development of Cenozoic basins and volcanic rocks.These results will provide a sci-entific basis for the prevention and reduction of earthquake-induced hazards,major engineering construction,urban plan-ning,and land use in southern Jiangsu and even the broader Yangtze River Delta.关键词
溧阳-南渡断裂/第四纪活动性/隐伏断裂/活动性/浅层地震勘探/钻孔联合地质剖面Key words
Liyang-Nandu fault/Quaternary activity/concealed fault/activity/shallow seismic exploration/cross-well stratigraphic correlation分类
天文与地球科学引用本文复制引用
张硕,张平,陈火根,许书刚,龚绪龙,许汉刚,李丽梅,冯文立,何宗南..苏南溧阳-南渡断裂活动性研究[J].煤田地质与勘探,2023,51(12):47-56,10.基金项目
苏南现代化建设示范区综合地质调查项目 （）
