煤田地质与勘探2023，Vol.51Issue(12)：29-37,9.DOI:10.12363/issn.1001-1986.23.10.0626
郯庐断裂带江苏段山左口-泗洪断裂活动特征变化及成因分析
Activity variations of the Shanzuokou-Sihong fault within the Jiangsu segment of the Tancheng-Lujiang fault zone and their origins
摘要
Abstract
The Shanzuokou-Sihong fault,having undergone the entire evolutionary process of the Tancheng-Lujiang fault zone,exhibits segmentation during the latest activity epoch.Determining the location and origin of its activity seg-mentation will provide a significant reference for exploring the activity variations of its branch faults and their origins.This study investigated the activity of the Shanzuokou-Sihong fault using a three-dimensional approach combining field geological surveys,shallow seismic exploration,and cross-well stratigraphic correlation.The results show that the Shan-zuokou-Sihong fault is a Late Pleistocene active fault on the east side of the North Maling Mountain and a Middle Pleis-tocene fault in Xinyi City.Moreover,a Late Pleistocene-Early Holocene active fault has been discovered recently at the Zhangcang Primary School in Xinyi City(also known as the Zhangcang Primary School fault).With the intersection of this newly discovered fault and the Shanzuokou-Sihong fault(northeast of Zhangcang Village)as demarcation,the Shan-zuokou-Sihong fault can be divided into northern and southern segments,which are a Late Pleistocene active fault and an Early-Middle Pleistocene fault,respectively.Since the Late Pleistocene,the northern segment has extended south-ward to the Zhangcang Primary School fault due to fault activity.The North Maling Mountain is a bedrock massif with-in the Tan-Lu fault zone,distributed along the strike of the fault zone.Its continuous uplift since the Quaternary has a certain coupling relationship with the activity variations of the Shanzuokou-Sihong fault.This study will provide a valu-able reference for understanding both the activity variations of other branch faults and the formation mechanism of hills and mountains in the Tancheng-Lujiang fault zone.关键词
郯庐断裂带/山左口-泗洪断裂/活动性/浅层地震勘探/钻孔联合地质剖面/北马陵山Key words
Tancheng-Lujiang fault zone/Shanzuokou-Sihong fault/activity/shallow seismic exploration/cross-well stratigraphic correlation/Beimaling mountains分类
天文与地球科学引用本文复制引用
张浩,李伟,李丽梅,晏云翔,蒋新,王金艳,赵启光,顾勤平,许汉刚..郯庐断裂带江苏段山左口-泗洪断裂活动特征变化及成因分析[J].煤田地质与勘探,2023,51(12):29-37,9.基金项目
江苏省地震局青年科学基金项目(201802,202203) （201802,202203）
中国地震局地震星火科技项目(XH18016Y) （XH18016Y）
