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断层的阶区构造及生长机制:以狼山山前断层带为例
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  • 英文篇名:Relay structures and linkage characteristics of normal fault:an example from the Langshan piedmont normal fault zone
  • 作者:赵衡 ; 张进 ; 李岩峰 ; 曲军峰 ; 张北航 ; 牛鹏飞 ; 云龙 ; 张义平 ; 王艳楠
  • 英文作者:ZHAO Heng;ZHANG Jin;LI Yanfeng;QU Junfeng;ZHANG Beihang;NIU Pengfei;YUN Long;ZHANG Yiping;WANG Yannan;Institute of Geology, Chinese Academy of Geological Sciences;National Earthquake Response Support Service;Beijing Research Institute of Uranium Geology;Chinese Academy of Geological Sciences;School of Earth Science and Engineering, Hebei University of Engineering;
  • 关键词:狼山 ; 断层 ; 阶区 ; 断层连接
  • 英文关键词:Langshan;;Normal fault;;Relay structure;;fault linkage
  • 中文刊名:DZXE
  • 英文刊名:Acta Geologica Sinica
  • 机构:中国地质科学院地质研究所;中国地震应急搜救中心;核工业北京地质研究院;中国地质科学院;河北工程大学地球科学与工程学院;
  • 出版日期:2019-07-15
  • 出版单位:地质学报
  • 年:2019
  • 期:v.93
  • 基金:国家科技部国家重点研究开发项目(编号2017YFC0601301);; 国家自然科学基金项目(编号41572190);; 中国地质调查局项目(编号12120115069601)资助的成果
  • 语种:中文;
  • 页:DZXE201907005
  • 页数:17
  • CN:07
  • ISSN:11-1951/P
  • 分类号:53-69
摘要
断层带在生长过程中内部发育有阶区构造,阶区在正断层的相互作用、连接过程中起重要控制作用,同时阶区还影响地表径流和沉积盆地的发展、流体的运移和圈闭的形成。位于内蒙古河套断陷西缘的狼山山前断裂是晚新生代以来持续活动的大型正断层系统,断层带内部发育有不同类型的阶区构造。识别出了两种类型阶区的连接方式,一种是两条平行断层之间的斜坡从"软连接"到"硬连接"的演化过程;另一种是楔状阶区通过一条断层向另一条断层扩展的方式连接产生。基岩中的先存构造要素控制并影响山前正断层的展布方位及阶区的形态:基底内部NNE向糜棱面理控制山前断层带的走向,早期向SE倾斜的逆冲断层面被正断层局部利用。沿断层倾向方向,山前正断层逐渐向盆地方向扩展,最新活动的断层位于盆地边缘甚至盆地内部;沿断层走向方向,狼山山前正断层逐渐向南西侧扩展。
        Relay structures are common in active normal fault zones, and play an important role in fault interaction and linkage. In addition, relay structures also affects the evolution of drainage system and the transportation of sediments into basin, the process of fluids migration and trapping. The Langshan piedmont fault, which is located in the western margin of the Hetao Depression in Inner Mongolia, is a large-scale normal fault system that has been continuously active since the late Cenozoic. There are different types of relay structures in the fault zone. Two types of relay zone have been identified: one is formed by two paralleled fault between which the rely ramp evolved from "soft link" to "hard link"; the other kind is wedge-shaped relay formed by a fault extending to another one. The pre-existing structures in basement control and affect the distribution of the normal faults as well as the morphology of the relay zone. The NNE trending mylonitic foliation within the basement controls the strike of the linked normal faults zone, with the pre-existing thrust fault plane partially utilized by normal faults. Newly formed faults migrate gradually to the basinward direction. The latest active faults are located at the margin of the basin and even within the basin. The Langshan piedmont normal fault extends southwestward gradually along the strike direction.
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