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嘉黎-察隅断裂带中南段晚第四纪活动性及其古地震记录
投稿时间:2020-09-29  修订日期:2020-11-17  点此下载全文
引用本文:
DOI:10.19762/j.cnki.dizhixuebao.2021069
摘要点击次数: 149
全文下载次数: 199
作者单位地址
钟宁 新构造运动与地质灾害重点实验室
自然资源部深地动力学重点实验室 
北京市海淀区民族大学南路11号
郭长宝 新构造运动与地质灾害重点实验室 北京市海淀区民族大学南路11号
黄小龙 新构造运动与地质灾害重点实验室 
吴瑞安 新构造运动与地质灾害重点实验室 
丁莹莹 新构造运动与地质灾害重点实验室 
张献兵 新构造运动与地质灾害重点实验室 
李海兵 自然资源部深地动力学重点实验室 
基金项目:中国地质调查局项目(编号: DD20190319,DD20190059),国家自然科学(编号: 41807298)、中国博士后基金(编号: 2019M650788)。第一作者:钟宁, 男, 1986年生。博士, 助理研究员。构造地质学专业。研究方向为活动构造与灾变沉积学。E-mail: zdn2018@126.com。通讯作者:郭长宝, 男, 1980年生, 博士, 副研究员。从事工程地质与地质灾害方面的研究。E-mail: guochangbao@163.com。 ,郭长宝1*,黄小龙1,吴瑞安1,丁莹莹1,张献兵1,李海兵2
中文摘要:嘉黎-察隅断裂带是喀喇昆仑-嘉黎断裂带的东段及其东延部分,其中南段主要是指东构造结顶部及东南的通麦-波密-察隅段,断裂位于构造强烈隆升的高山峡谷地貌区,植被茂密、断错地貌不清晰,且缺少第四纪沉积,阻碍了对该断裂带的空间几何展布和地震活动性研究。本文通过对嘉黎-察隅断裂带中南段的遥感解译和地质调查,以及断错地貌和晚第四纪湖相软沉积物变形构造的研究,结合古地震探槽和地质测年等手段,新识别出2次古地震事件,时间限定在16.13±1.06~15.66±0.92ka和8630±600a~9561±37a B.P.。综合前人资料,分析认为嘉黎-察隅断裂带中南段晚第四纪以来可能发生了5次古地震事件,分别为16130~15660a、11060±940a、8630~9561a B.P.、2780~2160a B.P.和650a B.P.,地震复发周期约为2000~5000a。GPS数据表明,嘉黎-察隅断裂带中段和东南段水平滑动速率为1.3~2.0mm/a和2~4mm/a,挤压速率为2.5~2.9mm/a和5.1~6.2mm/a,为右旋挤压性质,均存在南北两支断层。断裂活动明显受控于青藏高原东向和绕喜马拉雅东构造结的顺时针旋转运动。嘉黎-察隅断裂带与龙门山断裂带均具有低滑动速率、长复发周期地震特征,考虑到喜马拉雅东构造结顶部目前仍处于较高的构造挤压状态,未来有发生Ms ≥7级地震的可能性。
中文关键词:软沉积物变形构造  地震活动性  嘉黎-察隅断裂带中南段  晚第四纪  喜马拉雅东构造结
 
ReferenceLate Quaternary activity and paleoseismic records of the middle south section of Jiali-Chayu fault
Author NameAffiliationAddress
zhongning Institute of Geomechanics, Chinese Academy of Geological Sciences 北京市海淀区民族大学南路11号
guo changbao Institute of Geomechanics, Chinese Academy of Geological Sciences 北京市海淀区民族大学南路11号
huang xiaolong Institute of Geomechanics, Chinese Academy of Geological Sciences 
wu ruian Institute of Geomechanics, Chinese Academy of Geological Sciences 
ding yingying Institute of Geomechanics, Chinese Academy of Geological Sciences 
zhang xinbing Institute of Geomechanics, Chinese Academy of Geological Sciences 
li haibing Institute of Geology, Chinese Academy of Geological Sciences 
Abstract:The middle south section of Jiali-Chayu fault is located in intensive uplift alpine topography area. Due to the dense vegetation, unclear fault landforms, and lack of Quaternary sediments, which hinder understanding of the geometric distribution of fault and seismicity. Based on the remote sensing interpretation, faulted landforms and soft-sediment deformation structures in Late Quaternary lacustrine, and geophysical section, paleoseismic trench, OSL and 14C dating of sediment, at least two paleoseismic events were revealed with ages between 16.13±1.06~15.66±0.92ka and 8630±600a~9561±37 BP., respectively. According to the geological survey combined with the data available, at least five paleoseismic events since the late Quaternary in the middle-south section of Jiali-Chayu fault, time is 16130~15660a, 11060a, 8630~9561a BP, 2780~2160a BP and 650a BP, and the earthquake recurrence period is about 2000-5000a. GPS data show that the horizontal slip rates of the middle and southeast sections of the Jiali-Chayu fault are 1.3-2.0mm/a and 2-4mm/a, the compression rates are 2.5-2.9mm/a and 5.1-6.2mm/a, both are dextral compression, and there are two faults in north and south. The fault activity is obviously controlled by the eastward escaping of the Tibetan Plateau and clockwise rotation around the eastern Himalayan syntaxis. Jiali-Chayu fault has a characterized by slow strain accumulation and long recurrence interval. Considering that the top of eastern Himalayan syntaxis is still in a high state of structural compression, possibility of an earthquake (M≥7) in the future.
keywords:soft-sediment  deformation structures, seismic  activity, late  Quaternary, Jiali-Chayu  fault, East  Himalayas (Namcha  Barwa) syntaxis
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