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DOI	10.1016/j.tecto.2023.229816
	Cenozoic kinematics of the Wenchuan-Maoxian fault implies crustal stacking rather than channel flow extrusion at the eastern margin of Tibetan plateau (Longmen Shan)
	Ge, Chenglong; Leloup, Philippe Herve; Zheng, Yong; Scaillet, Stephane; Airaghi, Laura; Duval, Florian; Zhang, Jinjiang; Li, Haibing
发表日期	2023
ISSN	0040-1951
EISSN	1879-3266
卷号	857
英文摘要	The Longmen Shan, eastern and steepest margin of the Tibetan plateau, is often seen as the archetype example of an orogenic system built by crustal channel flow extrusion since the Miocene. This model is controversial as other studies propose an accretionary prism mechanism. A key difference between these models resides in the kinematics proposed for the Wenchuan -Maoxian (WM) fault zone, a major tectonic structure of the Longmen Shan. We constrain the Cenozoic kinematics of the WM fault zone by combining structural observations, fault gouge K/ Ar dating and 40Ar/39Ar dating of syn-kinematic white mica. Normal / right lateral ductile deformation occurred at 28.0 +/- 0.9 Ma while top-to-the-east reverse deformation at 15.4 +/- 0.2 Ma. K/Ar ages of authigenic illite from two fault gouges show that brittle right-lateral / reverse deformation was active at 6.9 +/- 2.9 Ma. These ages are consistent with the relative vertical motions across the fault zone deduced from thermochronology. Three deformation phases can be identified: right-lateral / normal in the Middle Oligocene (-30-25 Ma), reverse in the middle Miocene (25-15 Ma), and right-lateral / reverse since the upper Miocene (since-6 Ma). The WM fault zone never experienced pure normal motion, and only shortening since the Oligocene, in contrast to predictions of lower crustal channel-flow extrusion models. These results are in favor of a crustal accretionary prism model for the Cenozoic building of the eastern Tibetan plateau.
关键词	Longmen Shan Brittle ductile faulting Fault gouge dating Petro-geochronology Mountain building
英文关键词	AMBIENT SEISMIC NOISE; WAVE ARRAY TOMOGRAPHY; 2-STATION ANALYSIS; WESTERN SICHUAN; THRUST BELT; SE TIBET; K-AR; DEFORMATION; CONSTRAINTS; EARTHQUAKE
WOS研究方向	Geochemistry & Geophysics
WOS记录号	WOS:000991115200001
来源期刊	TECTONOPHYSICS
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/283881
作者单位	Ministry of Natural Resources of the People's Republic of China; China Geological Survey; Institute of Geology, Chinese Academy of Geological Sciences; Chinese Academy of Geological Sciences; Peking University; Centre National de la Recherche Scientifique (CNRS); CNRS - National Institute for Earth Sciences & Astronomy (INSU); Universite Claude Bernard Lyon 1; Ecole Normale Superieure de Lyon (ENS de LYON); Centre National de la Recherche Scientifique (CNRS); CNRS - National Institute for Earth Sciences & Astronomy (INSU); Bureau de Recherches Geologiques et Minieres (BRGM); Universite de Orleans
推荐引用方式 GB/T 7714	Ge, Chenglong,Leloup, Philippe Herve,Zheng, Yong,et al. Cenozoic kinematics of the Wenchuan-Maoxian fault implies crustal stacking rather than channel flow extrusion at the eastern margin of Tibetan plateau (Longmen Shan)[J],2023,857.
APA	Ge, Chenglong.,Leloup, Philippe Herve.,Zheng, Yong.,Scaillet, Stephane.,Airaghi, Laura.,...&Li, Haibing.(2023).Cenozoic kinematics of the Wenchuan-Maoxian fault implies crustal stacking rather than channel flow extrusion at the eastern margin of Tibetan plateau (Longmen Shan).TECTONOPHYSICS,857.
MLA	Ge, Chenglong,et al."Cenozoic kinematics of the Wenchuan-Maoxian fault implies crustal stacking rather than channel flow extrusion at the eastern margin of Tibetan plateau (Longmen Shan)".TECTONOPHYSICS 857(2023).