Discovery of active faults in the southern Beishan area, NW China: Implications for regional tectonics
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...
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| Format: | Article |
| Language: | zho |
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Institute of Geomechanics, Chinese Academy of Geological Sciences
2021-04-01
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| Series: | Dizhi lixue xuebao |
| Subjects: | |
| Online Access: | https://journal.geomech.ac.cn//article/doi/10.12090/j.issn.1006-6616.2021.27.02.019 |
| _version_ | 1797893862135431168 |
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| author | YUN Long ZHANG Jin WANG Ju ZHAO Zhitao BAO Yintu ZHUANG Haiyang CHEN Su ZHANG Jingjia ZHANG Jia ZHAO Heng ZHANG Beihang |
| author_facet | YUN Long ZHANG Jin WANG Ju ZHAO Zhitao BAO Yintu ZHUANG Haiyang CHEN Su ZHANG Jingjia ZHANG Jia ZHAO Heng ZHANG Beihang |
| author_sort | YUN Long |
| collection | DOAJ |
| description | 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. |
| first_indexed | 2024-04-10T06:59:42Z |
| format | Article |
| id | doaj.art-a225375f47af46be992bb954fbc62c41 |
| institution | Directory Open Access Journal |
| issn | 1006-6616 |
| language | zho |
| last_indexed | 2024-04-10T06:59:42Z |
| publishDate | 2021-04-01 |
| publisher | Institute of Geomechanics, Chinese Academy of Geological Sciences |
| record_format | Article |
| series | Dizhi lixue xuebao |
| spelling | doaj.art-a225375f47af46be992bb954fbc62c412023-02-28T01:32:35ZzhoInstitute of Geomechanics, Chinese Academy of Geological SciencesDizhi lixue xuebao1006-66162021-04-0127219520710.12090/j.issn.1006-6616.2021.27.02.019Discovery of active faults in the southern Beishan area, NW China: Implications for regional tectonicsYUN Long0ZHANG Jin1WANG Ju2ZHAO Zhitao3BAO Yintu4ZHUANG Haiyang5CHEN Su6ZHANG Jingjia7ZHANG Jia8ZHAO Heng9ZHANG Beihang10Key Laboratory on Geological Disposal of High-level Radioactive Waste, Beijing Research Institute of Uranium Geology, CNNC, Beijing 100029, ChinaInstitute of Geology, Chinese Academy of Geological Science, Beijing 100037, ChinaKey Laboratory on Geological Disposal of High-level Radioactive Waste, Beijing Research Institute of Uranium Geology, CNNC, Beijing 100029, ChinaBeijing institute of Exploration Engineering, China Geological Survey, Beijing 100083, ChinaTransportation Institute, Inner Mongolia University, Hohhot 210020, Inner Mongolia, ChinaInstitute of Geotechnical Engineering, Nanjing Tech University, Nanjing 210009, Jiangsu, ChinaInstitute of Geophysics, China Earthquake Administration, Beijing 100081, ChinaKey Laboratory on Geological Disposal of High-level Radioactive Waste, Beijing Research Institute of Uranium Geology, CNNC, Beijing 100029, ChinaKey Laboratory on Geological Disposal of High-level Radioactive Waste, Beijing Research Institute of Uranium Geology, CNNC, Beijing 100029, ChinaInstitute of Geology, Chinese Academy of Geological Science, Beijing 100037, ChinaInstitute of Geology, Chinese Academy of Geological Science, Beijing 100037, ChinaOn 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.https://journal.geomech.ac.cn//article/doi/10.12090/j.issn.1006-6616.2021.27.02.019northern margin of the tibetan plateausouthern margin of the beishan orogenic beltjiujing-bantan faultebomiao faultneotectonics |
| spellingShingle | YUN Long ZHANG Jin WANG Ju ZHAO Zhitao BAO Yintu ZHUANG Haiyang CHEN Su ZHANG Jingjia ZHANG Jia ZHAO Heng ZHANG Beihang Discovery of active faults in the southern Beishan area, NW China: Implications for regional tectonics Dizhi lixue xuebao northern margin of the tibetan plateau southern margin of the beishan orogenic belt jiujing-bantan fault ebomiao fault neotectonics |
| title | Discovery of active faults in the southern Beishan area, NW China: Implications for regional tectonics |
| title_full | Discovery of active faults in the southern Beishan area, NW China: Implications for regional tectonics |
| title_fullStr | Discovery of active faults in the southern Beishan area, NW China: Implications for regional tectonics |
| title_full_unstemmed | Discovery of active faults in the southern Beishan area, NW China: Implications for regional tectonics |
| title_short | Discovery of active faults in the southern Beishan area, NW China: Implications for regional tectonics |
| title_sort | discovery of active faults in the southern beishan area nw china implications for regional tectonics |
| topic | northern margin of the tibetan plateau southern margin of the beishan orogenic belt jiujing-bantan fault ebomiao fault neotectonics |
| url | https://journal.geomech.ac.cn//article/doi/10.12090/j.issn.1006-6616.2021.27.02.019 |
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