| 甘肃北山南部活动断裂的发现及其区域构造意义 |
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| 引用本文： | 云龙,张进,王驹,赵志涛,宝音图,庄海洋,陈苏,张竞嘉,张佳,赵衡,张北航.甘肃北山南部活动断裂的发现及其区域构造意义[J].地质力学学报,2021,27(2):195-207. |
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| 作者姓名： | 云龙 张进 王驹 赵志涛 宝音图 庄海洋 陈苏 张竞嘉 张佳 赵衡 张北航 |
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| 作者单位： | 核工业北京地质研究院中核高放废物地质处置评价技术重点实验室, 北京 100029;中国地质科学院地质研究所, 北京 100037;中国地质调查局北京探矿工程研究所, 北京 100083;内蒙古大学交通学院, 内蒙古呼和浩特 210020;南京工业大学交通运输工程学院, 江苏南京 210009;中国地震局地球物理研究所, 北京 100081 |
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| 基金项目： | 国家自然基金面上项目（41972224）；高放废物地质处置库选址项目（FZ1805）；中国地质调查局基础地质调查项目（DD20190004，DD20189616）；核工业北京地质研究院院长青年创新基金（QJ1801） |
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| 摘 要： | 在河西走廊北侧、北山南缘新发现属于不同断裂系统的两条晚第四纪活动断裂，分别称之为旧井-板滩断裂和俄博庙断裂。其中，旧井-板滩断裂长约28 km，距玉门市约55 km，由4条分支断裂组成，呈复杂的"Y"字形分布。总体走向北东40°~50°，倾向北西，倾角60°~70°，控制了西侧两个晚新生代盆地的发育。俄博庙断裂长约18 km，距金塔县城约50 km，走向近东西，倾向北西，倾角60°~80°。根据卫星影像解译、断错地貌调查、探槽开挖和光释光测年结果，旧井-板滩断裂断错了一系列山脊、冲沟和阶地，在距今约2万年以来有过活动，以正左旋走滑为主；俄博庙断裂北向逆冲形成清晰的线性陡坎，并左旋断错了冲沟，在距今约3万年以来有过活动，以逆左旋走滑为主。以上两条断裂的新构造活动揭示了青藏高原北缘晚新生代以来的远程应变传递已经进入北山造山带南缘。
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| 关 键 词： | 青藏高原北缘 北山造山带南缘 旧井-板滩断裂 俄博庙断裂 新构造 |
| 收稿时间： | 2020/12/3 0:00:00 |
| 修稿时间： | 2021/2/8 0:00:00 |
Discovery of active faults in the southern Beishan area, NW China: Implications for regional tectonics |
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| YUN Long,ZHANG Jin,WANG Ju,ZHAO Zhitao,BAO Yintu,ZHUANG Haiyang,CHEN Su,ZHANG Jingji,ZHANG Ji,ZHAO Heng,ZHANG Beihang.Discovery of active faults in the southern Beishan area, NW China: Implications for regional tectonics[J].Journal of Geomechanics,2021,27(2):195-207. |
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| Authors: | YUN Long ZHANG Jin WANG Ju ZHAO Zhitao BAO Yintu ZHUANG Haiyang CHEN Su ZHANG Jingji ZHANG Ji ZHAO Heng ZHANG Beihang |
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| Institution: | Key Laboratory on Geological Disposal of High-level Radioactive Waste, Beijing Research Institute of Uranium Geology, CNNC, Beijing 100029, China;Institute of Geology, Chinese Academy of Geological Science, Beijing 100037, China;Beijing institute of Exploration Engineering, China Geological Survey, Beijing 100083, China;Transportation Institute, Inner Mongolia University, Hohhot 210020, Inner Mongolia, China;Institute of Geotechnical Engineering, Nanjing Tech University, Nanjing 210009, Jiangsu, China;Institute of Geophysics, China Earthquake Administration, Beijing 100081, China |
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| Abstract: | On the north side of the Hexi Corridor, two active faults, which belong to two different fault systems, have been discovered on the southern margin of Beishan, namely the Jiujing-Bantan fault and the Ebomiao fault. The NE-trending (40°~50°) Jiujing-Bantan fault with a NW-trending dip angle of 60°~70° is ~28 km long and ~55 km away from Yumen City. It consists of 4 branches and presents a complex Y-shaped distribution, controlling the development of the two late Pleistocene basins on its west side. The nearly EW-trending Ebomiao fault with a NW-trending dip angle of 60°~80° is ~18 km long and ~50 km away from Jinta County. Base on results from the satellite image interpretation, offset geomorphological survey, trench excavation and optical luminescence dating, we discovered a series of ridges, gullies and terraces offset by the Jiujing-Bantan fault which has been active since ~20 ka ago mostly with normal left-lateral strike-slips. The northward thrusting of the Ebomiao fault formed a clear linear scarp and offset the gullies with left-lateral strike-slips. This fault has been active since ~30 ka ago, mainly with reverse left-lateral strike-slips. The neotectonic activities of these two faults evidences that the long-range strain transmission from the northern margin of the Tibetan Plateau has entered into the southern margin of the Beishan orogenic belt since the late Cenozoic. |
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| Keywords: | northern margin of the Tibetan Plateau southern margin of the Beishan orogenic belt Jiujing-Bantan fault Ebomiao fault neotectonics |
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