The Cenozoic Evolution of Crustal Shortening and Left-Lateral Shear in the Central East Kunlun Shan: Implications for the Uplift History of the Tibetan Plateau

doi:10.1029/2020TC006065

	The Cenozoic Evolution of Crustal Shortening and Left-Lateral Shear in the Central East Kunlun Shan: Implications for the Uplift History of the Tibetan Plateau
	Staisch, Lydia M.1,2; Niemi, Nathan A.1; Clark, Marin K.1; Chang, Hong 3
刊名	TECTONICS
	2020-09-01
卷号	39 期号:9 页码:30
关键词	Tibetan Plateau thermochronology geochronology structural geology mapping surface uplift
ISSN号	0278-7407
DOI	10.1029/2020TC006065
通讯作者	Staisch, Lydia M.(lstaisch@usgs.gov)
英文摘要	The timing of crustal shortening and strike-slip faulting along the East Kunlun Shan provides insight into the history of surface uplift and may constrain the time at which the Tibetan Plateau reached high elevations. We investigate a series of extensional basins and restraining bends along the Xidatan strand of the Kunlun strike-slip fault, which provide an ideal setting to unravel the tectonic history of the northern plateau margin. We present new apatite (U-Th)/He, apatite fission track, and zircon (U-Th)/He ages and QTQt thermal modeling, Ar-40/Ar-39 fault gouge dating, and structural mapping from the central East Kunlun Shan. Our data suggest that the East Kunlun Shan experienced slow to negligible exhumation until late Cretaceous time, followed by an increase in rate by 65-50 Ma. Along with a similar to 47 Ma fault gouge age, we posit that the Paleocene-early Eocene was a time of crustal shortening along the northern plateau. Rapid exhumation along transpressional portions of the Xidatan fault initiated by 23-20 Ma, which we interpret as the local onset of strike-slip faulting. An early Miocene transition from north-south crustal shortening to left-lateral shear along the East Kunlun Shan, the onset of normal and strike-slip faulting in central and southern Tibet by 18 Ma, and lower crustal flow in eastern Tibet by 13 Ma suggest the establishment of orogen-wide east-west oriented extension and extrusion by the middle Miocene. The plateau-wide shift in stress accommodation implies that high gravitational potential energy, and likely high elevation, was attained by the middle Miocene.
资助项目	National Science Foundation Continental Dynamics Grants[EAR-0908711] ; National Science Foundation Continental Dynamics Grants[EAR-1211434] ; National Science Foundation ; Geological Society of America ; University of Michigan Turner Grants ; National Natural Science Foundation of China[40921120406]
WOS关键词	APATITE (U-TH)/HE THERMOCHRONOMETRY ; SAN-ANDREAS FAULT ; ALTYN-TAGH FAULT ; NORTHERN TIBET ; TECTONIC EVOLUTION ; SLIP-RATE ; SOUTHERN TIBET ; BASIN EVOLUTION ; QAIDAM BASIN ; LHASA BLOCK
WOS研究方向	Geochemistry & Geophysics
语种	英语
出版者	AMER GEOPHYSICAL UNION
WOS记录号	WOS:000576412900019
资助机构	National Science Foundation Continental Dynamics Grants ; National Science Foundation ; Geological Society of America ; University of Michigan Turner Grants ; National Natural Science Foundation of China
内容类型	期刊论文
源URL	[http://ir.ieecas.cn/handle/361006/15525]
专题	地球环境研究所_古环境研究室
通讯作者	Staisch, Lydia M.
作者单位	1.Univ Michigan, Dept Earth & Environm Sci, Ann Arbor, MI 48109 USA 2.US Geol Survey, Geol Minerals Energy & Geophys Sci Ctr, Portland, OR 97201 USA 3.Chinese Acad Sci, Inst Earth Environm, Xian, Peoples R China
推荐引用方式 GB/T 7714	Staisch, Lydia M.,Niemi, Nathan A.,Clark, Marin K.,et al. The Cenozoic Evolution of Crustal Shortening and Left-Lateral Shear in the Central East Kunlun Shan: Implications for the Uplift History of the Tibetan Plateau[J]. TECTONICS,2020,39(9):30.
APA	Staisch, Lydia M.,Niemi, Nathan A.,Clark, Marin K.,&Chang, Hong.(2020).The Cenozoic Evolution of Crustal Shortening and Left-Lateral Shear in the Central East Kunlun Shan: Implications for the Uplift History of the Tibetan Plateau.TECTONICS,39(9),30.
MLA	Staisch, Lydia M.,et al."The Cenozoic Evolution of Crustal Shortening and Left-Lateral Shear in the Central East Kunlun Shan: Implications for the Uplift History of the Tibetan Plateau".TECTONICS 39.9(2020):30.