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DOI	10.1016/j.jsg.2023.105037
	Stepwise decrease in strike-slip rate along the eastern Altyn Tagh Fault and its relation to the Qilian Shan thrust system, northeastern Tibetan Plateau
	Yan, Bing; Chen, Peng; Gao, Yang
发表日期	2024
ISSN	0191-8141
EISSN	1873-1201
卷号	179
英文摘要	As the northern boundary fault the Tibetan Plateau, the slip-rate decrease pattern of the eastern Altyn Tagh Fault (ATF) and its relation to the neighboring Qilian Shan thrust system remain unclear. In this study, high-resolution topographic data have been acquired by using the UAV-based LiDAR and Structure from Motion (SfM) technique. Using OSL dating ages obtained from terraces, we constrained the strike-slip rates at four locations along the eastern ATF, ranging from -7 mm/yr to -1 mm/yr. In combination with previous observations, a stepwise decrease pattern in strike-slip rate along the eastern ATF has been proposed in this study. To confirm this conclusion, sandbox experiments were conducted to simulate the simultaneous deformation involving the sinistral slip of the eastern ATF and the crustal shortening in the northeastern Tibetan Plateau. The role of ductile middle-lower crust was examined by comparative experiments (Models 1 and 2). In Model 1, without a ductile middle-lower crust, the wedge translated forward as a rigid block until reaching the frontal thrust, resulting in an almost uniform slip rate along the strike-slip fault. In Model 2, with a ductile middle-lower crust, the slip rate exhibited rapid decrease while passing each thrust belt, forming a stepwise decrease pattern rather than a gradient decrease; The compressional deformation was accommodated by a series of thrust belts that were active simultaneously, consistent with the late Quaternary simultaneous activity of the thrust belts within the Qilian Shan thrust system. Our modeling results suggested coupled growth between the eastern ATF and the Qilian Shan thrust system, and that a ductile middle-lower crust played important role in dispersing deformation into parallelly distributed thrust belts.
关键词	Altyn Tagh Fault Late quaternary slip rate Stepwise decrease pattern Sandbox modeling Northeastern Tibetan Plateau
英文关键词	CENOZOIC TECTONIC EVOLUTION; RESTRAINING DOUBLE BEND; WESTERN HEXI CORRIDOR; CRUSTAL DEFORMATION; EXTRUSION TECTONICS; XORKOLI SECTION; FRONTAL THRUST; NORTHERN TIBET; GANSU PROVINCE; ANALOG MODELS
WOS研究方向	Geosciences, Multidisciplinary
WOS记录号	WOS:001138855500001
来源期刊	JOURNAL OF STRUCTURAL GEOLOGY
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/283892
作者单位	Hohai University; China Geological Survey; Institute of Geomechanics, Chinese Academy of Geological Sciences; Chinese Academy of Geological Sciences
推荐引用方式 GB/T 7714	Yan, Bing,Chen, Peng,Gao, Yang. Stepwise decrease in strike-slip rate along the eastern Altyn Tagh Fault and its relation to the Qilian Shan thrust system, northeastern Tibetan Plateau[J],2024,179.
APA	Yan, Bing,Chen, Peng,&Gao, Yang.(2024).Stepwise decrease in strike-slip rate along the eastern Altyn Tagh Fault and its relation to the Qilian Shan thrust system, northeastern Tibetan Plateau.JOURNAL OF STRUCTURAL GEOLOGY,179.
MLA	Yan, Bing,et al."Stepwise decrease in strike-slip rate along the eastern Altyn Tagh Fault and its relation to the Qilian Shan thrust system, northeastern Tibetan Plateau".JOURNAL OF STRUCTURAL GEOLOGY 179(2024).