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沂沭断裂带北段东支断裂的浅部构造特征及活动性
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  • 英文篇名:Shallow tectonic characteristics and activity of the east branch faults of the northern segment of the Yishu fault zone
  • 作者:徐建国 ; 徐华 ; 张涛 ; 张卓 ; 祁晓凡 ; 侯建华 ; 纪汶龙 ; 刘宏伟
  • 英文作者:XU Jianguo;XU Hua;ZHANG Tao;ZHANG Zhuo;QI Xiaofan;HOU Jianhua;JI Wenlong;LIU Hongwei;Shandong Institute of Geological Survey;Tianjin Center of China Geological Survey;
  • 关键词:沂沭断裂带 ; 主干断裂 ; 昌邑潜凸起 ; 浅部构造 ; 活动性
  • 英文关键词:Yishu fault zone;;main faults;;Changyi Salient;;shallow tectonics;;activity
  • 中文刊名:DZXE
  • 英文刊名:Acta Geologica Sinica
  • 机构:山东省地质调查院;中国地质调查局天津地质调查中心;
  • 出版日期:2019-04-15
  • 出版单位:地质学报
  • 年:2019
  • 期:v.93
  • 基金:中国地质调查局地质调查项目(编号1212011220001;J50E018023;J50E019022;J50E019020;J50E017021;12120114033801)资助的成果
  • 语种:中文;
  • 页:DZXE201904002
  • 页数:15
  • CN:04
  • ISSN:11-1951/P
  • 分类号:16-30
摘要
沂沭断裂带北段即潍坊市朱里以北的隐伏构造区,其主要隐伏活动断裂对第四系的发育具有控制作用。沂沭断裂带的活动性具有东强西弱的特点,其东支主干断裂是新构造运动强活动带,对地震的发生具有控制作用。莱州湾地区所开展的1∶5万区域地质调查、工程地质调查,通过大量的地面调查、物探、钻探等工作,对沂沭断裂带北段安丘-莒县断裂、昌邑-大店断裂的空间分布及活动性进行了深入调查研究,结果表明:两条主干断裂呈NNE向大致平行展布延伸,进入莱州湾海域,其中昌邑-大店断裂活动性质表现为走滑为主兼具逆冲运动,倾角近直立,倾向大致以东冢村北为界,由南段的倾向东转为北段的倾向西,该断裂最晚活动时代为晚更新世。安丘-莒县断裂控制了新生代地层的空间分布,新生代以来活动方式以向西正断为主,错断全新世地层并造成地表建筑物的开裂,目前仍处于活动期。本次调查首次确定了昌邑潜凸起的存在,该凸起位于断裂带北段东支两条主断裂之间,凸起区第四系厚度明显变薄,局部基岩出露;以柳疃断裂为界,北段潜凸区第四系下伏地层为新近纪明化镇组、馆陶组;南段潜凸区第四系下伏地层为新近纪八亩地组、牛山组,古近纪朱碧店组和白垩纪红土崖组。昌邑潜凸起区的发现对于莱州湾南岸水文地质、工程地质调查研究工作具有重要意义。
        The northern segment of the Yishu fault zone refers to the concealed tectonic area which distributes to the north of Juli, Weifang city, and its main concealed active faults play a controlling role in the development of the Quaternary System. The east segments of the Yishu fault zone are more active than the west segments. The main east branch fault is a strong activity zone of the new tectonic movement, which has a controlling effect on the occurrence of earthquakes. The spatial distribution and activity of the Anqiu-Juxian fault and the Changyi-Dadian fault of the northern segment of the Yishu fault zone were investigated through ground investigation, geophysical prospecting and drilling by the 1∶50000 regional geological survey and engineering geological survey programs carried out in the Laizhou Bay Area. The results show that the two main faults have roughly parallel distribution of NNE direction, extending into the Laizhou Bay Area. The activity of the Changyi-Dadian fault is dominated by strike-slip, together with thrust motion, and the fault dip angles are nearly vertical. The fault dip of the Changyi-Dadian fault changes at the north of the Dongzhong village, which shifts from east at the south part of the fault to west at the north part. The latest activity age of the fault is the late Pleistocene. The Anqiu-Juxian fault controls the spatial distribution of the Cenozoic strata, and is mainly west dipping normal fault since the Cenozoic Era. The fault breaks the Holocene strata significantly and causes the cracking of the surface buildings, which indicates that the fault is a Holocene active fault and is still active at present. The geological survey of this time firstly confirms the existence of the Changyi Salient, which is located between the two main east branch faults in the northern part of the fault zone. The Quaternary thickness of the salient area is thinner significantly, and the bedrock is exposed at some area. Divided by the Liutuan fault, the Quaternary underlying strata of the north part of the salient are the Minghuazhen Formation and the Guantao Formation of the Neogene, and the underlying strata of the south part of the salient are the Bamudi Formation, the Niushan Formation of the Neogene, Zhubidian Formation of the Paleogene and the Hongtuya Formation of the Cretaceous. The discovery of the Changyi Salient is of great significance to the investigation and study of hydrogeological and engineering geology in the south coast of the Laizhou Bay.
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