Eocene to late Oligocene history of crustal shortening within the Hoh Xil Basin and implications for the uplift history of the northern Tibetan Plateau

doi:10.1002/2015TC003972

	Eocene to late Oligocene history of crustal shortening within the Hoh Xil Basin and implications for the uplift history of the northern Tibetan Plateau
	Chang, Hong 2; Staisch, Lydia M.1; Clark, Marin K.1; Niemi, Nathan A.1
刊名	TECTONICS
	2016-04-01
卷号	35 期号:4 页码:862-895
DOI	10.1002/2015TC003972
文献子类	Article
英文摘要	The timing and magnitude of deformation across the northern Tibetan Plateau are poorly constrained but feature prominently in geodynamic models of the plateau's evolution. The Fenghuoshan fold and thrust belt, located in the Hoh Xil Basin, provides a valuable record of the Cenozoic deformation history of the northern Tibetan Plateau. Here we integrate fault gouge geochronology, low-temperature thermochronology, geologic mapping, and a balanced cross section to resolve the deformation history of Hoh Xil Basin. Chronologic data suggest that deformation initiated in the mid-Eocene continued until at least 34 Ma and ceased by 27 Ma. The balanced cross section resolves 34 +/- 12 km upper crustal shortening (24 +/- 9%). We explore whether the observed Cenozoic shortening can account for the modern elevation and lithospheric thickness in the northern Tibetan Plateau. For a range of reasonable preshortening conditions, we conclude that the observed shortening alone cannot achieve modern crustal and mantle lithospheric thicknesses or modern elevation without either the removal of lithospheric mantle, the influx of lower crustal material, or some combination of these processes. Our results, along with previous studies, suggest that crustal shortening propagated into the northern Tibetan Plateau shortly after the onset of the Indo-Asian collision. The small magnitude of shortening and the late Oligocene cessation of deformation in the northern Tibetan Plateau raise questions of how and where the remaining Indo-Asian convergence was accommodated between Eocene to mid-Miocene time, prior to the approximately late Miocene establishment of the deformation patterns observed in the present day.
WOS关键词	INDO-ASIAN COLLISION ; APATITE (U-TH)/HE THERMOCHRONOMETRY ; CENOZOIC TECTONIC EVOLUTION ; CENTRAL ANDEAN PLATEAU ; EAST-CENTRAL TIBET ; FOLD-THRUST BELT ; ALTYN-TAGH FAULT ; SOUTHERN TIBET ; VOLCANIC-ROCKS ; AR-40/AR-39 GEOCHRONOLOGY
WOS研究方向	Geochemistry & Geophysics
语种	英语
WOS记录号	WOS:000379501900001
内容类型	期刊论文
源URL	[http://ir.ieecas.cn/handle/361006/5712]
专题	地球环境研究所_古环境研究室
作者单位	1.Univ Michigan, Dept Earth & Environm Sci, Ann Arbor, MI 48109 USA 2.Chinese Acad Sci, Inst Earth Environm, Xian, Peoples R China
推荐引用方式 GB/T 7714	Chang, Hong,Staisch, Lydia M.,Clark, Marin K.,et al. Eocene to late Oligocene history of crustal shortening within the Hoh Xil Basin and implications for the uplift history of the northern Tibetan Plateau[J]. TECTONICS,2016,35(4):862-895.
APA	Chang, Hong,Staisch, Lydia M.,Clark, Marin K.,&Niemi, Nathan A..(2016).Eocene to late Oligocene history of crustal shortening within the Hoh Xil Basin and implications for the uplift history of the northern Tibetan Plateau.TECTONICS,35(4),862-895.
MLA	Chang, Hong,et al."Eocene to late Oligocene history of crustal shortening within the Hoh Xil Basin and implications for the uplift history of the northern Tibetan Plateau".TECTONICS 35.4(2016):862-895.