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DOI	10.3389/feart.2023.1057936
	Active tectonics and paleo-earthquakes in north Yumu Shan, northern Tibetan Plateau: Insights from structural analysis and radiocarbon dating
	Wang, Ye; Chen, Xuanhua; He, Chengguang; Xiao, Yongjun; Shao, Zhaogang; Han, Jian'en; Li, Bing; Zhang, Yiping; Ding, Weicui; Xu, Shenglin; Han, Lele
发表日期	2023
EISSN	2296-6463
卷号	11
英文摘要	The Yumu Shan is located at the northern margin of the Tibetan Plateau in northwest China. It is characterized by the development of several northeastward-protruding arcuate geomorphic bulge belts on its north slope. These bulge belts are distributed along the Wutongquan spring, the ancient Camel City, and the Xiaogengzi area, and south to Gaotai City in the Hexi Corridor. In this study, our detailed field mapping and structural analysis reveal northeastward active anticline folding along the curved bulge belts and related lacustrine sediments in their hinterlands. Radiocarbon dating of plant charcoal samples from lacustrine sedimentary layers yields a C-14 age of AD 178 +/- 42. This age is close to the time of the 180AD/Ms7.5 earthquake at Biaoshi City (i.e., the ancient Zhangye City) during the Eastern Han Dynasty. The similarity between seismic events and sedimentary age leads us to infer that the charcoal in the lacustrine layer records a major flood event related to the Biaoshi earthquake. We propose a fault-related fold model for the formation of the arcuate bulge belts and related sediments. First, a series of historical earthquake activities in the Holocene, especially the 180AD/Ms7.5 Biaoshi earthquake, may have led to active blind thrust faulting in the northern margin of the plateau. Then, blind thrusting may have resulted in fault-related anticline folding, causing the formation of geomorphic bulges. The latter acts as a flood-retaining dam, resulting in hinterland deposition of lacustrine sediments. For this reason, we suggest that seismogenic blind thrust faulting is responsible for the uplift and northward growth of the Tibetan Plateau. As the northernmost blind thrust in this area, the Xiaogengzi Fault could be considered the North Boundary Thrust (NBT), which defines exactly the northern margin of the plateau.
关键词	active tectonics paleo-earthquake radiocarbon dating blind thrusts plateau growth Hexi Corridor northeast Tibet
英文关键词	APATITE FISSION-TRACK; QILIAN-SHAN; HEXI CORRIDOR; NORTHEASTWARD GROWTH; RAPID DEFORMATION; OROGENIC BELT; QAIDAM BASIN; FAULT SYSTEM; THRUST BELT; SLIP RATES
WOS研究方向	Geosciences, Multidisciplinary
WOS记录号	WOS:000974257000001
来源期刊	FRONTIERS IN EARTH SCIENCE
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/283647
作者单位	Sinopec; China Geological Survey; Institute of Geomechanics, Chinese Academy of Geological Sciences; Chinese Academy of Geological Sciences; China University of Geosciences - Beijing
推荐引用方式 GB/T 7714	Wang, Ye,Chen, Xuanhua,He, Chengguang,et al. Active tectonics and paleo-earthquakes in north Yumu Shan, northern Tibetan Plateau: Insights from structural analysis and radiocarbon dating[J],2023,11.
APA	Wang, Ye.,Chen, Xuanhua.,He, Chengguang.,Xiao, Yongjun.,Shao, Zhaogang.,...&Han, Lele.(2023).Active tectonics and paleo-earthquakes in north Yumu Shan, northern Tibetan Plateau: Insights from structural analysis and radiocarbon dating.FRONTIERS IN EARTH SCIENCE,11.
MLA	Wang, Ye,et al."Active tectonics and paleo-earthquakes in north Yumu Shan, northern Tibetan Plateau: Insights from structural analysis and radiocarbon dating".FRONTIERS IN EARTH SCIENCE 11(2023).