气候变化领域集成服务门户(CCPortal): High-resolution lithospheric structures of the Qinling-Dabie orogenic belt: Implications for deep subduction and delamination of continental lithosphere

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DOI	10.1016/j.tecto.2021.228799
	High-resolution lithospheric structures of the Qinling-Dabie orogenic belt: Implications for deep subduction and delamination of continental lithosphere
	Zhao K.; Luo Y.; Yang Y.; Yang X.
发表日期	2021
ISSN	00401951
卷号	806
英文摘要	The Qinling-Dabie orogenic belt was formed during the collision between the North China Craton and the Yangtze Block. A large volume of the high-pressure (HP) and ultra-high-pressure (UHP) metamorphic rocks are exposed in the eastern Dabie Mountains. In order to better understand the collision processes and the exhumation mechanism of the HP/UHP rocks, we process ambient noise data recorded at stations in the Qinling-Dabie orogenic belt and surrounding areas to extract broadband Rayleigh wave dispersion curves at 8–95 s periods. Using these dispersion curves, we construct a high-resolution 3-D shear wave velocity model of the Qinling-Dabie orogenic belt and surrounding regions. Our 3-D model reveals high velocities in the uppermost mantle beneath the western Dabie Mountains and also beneath the western Qinling Mountains, suggesting the presence of remnant continental lithosphere from the past continental subduction. Low velocities in the lower crust and uppermost mantle beneath the eastern Qinling and eastern Dabie are imaged, suggesting the continental lithosphere delaminated in the past. Our 3-D model supports a two-stage exhumation model of the HP/UHP rocks in the eastern Dabie orogenic belt, in which HP/UHP rocks were first exhumed to the mid/lower crust in the first stage and were then further exhumed to the surface under the driving force of the upper mantle upwelling induced by the lithosphere delamination. © 2021 Elsevier B.V.
关键词	Ambient noise Lithosphere delamination Qinling-Dabie orogenic belt Remnant slab Two-stage exhumation
英文关键词	Landforms; Lithology; Metamorphic rocks; Shear flow; Shear waves; Structural geology; Wave propagation; Continental lithosphere; Continental subductions; Dabie orogenic belt; Lithospheric structure; Rayleigh-wave dispersion; Shear wave velocity models; Surrounding regions; Ultra-high-pressure metamorphic rocks; Dispersion (waves); ambient noise; collision zone; continental lithosphere; crust-mantle boundary; exhumation; lithospheric structure; lower crust; metamorphic rock; orogenic belt; P-T conditions; Rayleigh wave; S-wave; seismic velocity; subduction zone; three-dimensional modeling; upper mantle; wave dispersion; China; Dabie Mountains; North China Block; Qinling Mountains; Yangtze Platform
语种	英语
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/208118
作者单位	State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Wuhan, Hubei 430074, China; Hubei Subsurface Multi-scale Imaging Key Laboratory, Institute of Geophysics and Geomatics, China University of Geosciences, Wuhan, Hubei 430074, China; ARC Centre of Excellence for Core to Crust Fluid Systems (CCFS)/GEMOC, Dept. Earth and Environmental Sciences, Macquarie University, North Ryde, NSW 2109, Australia
推荐引用方式 GB/T 7714	Zhao K.,Luo Y.,Yang Y.,et al. High-resolution lithospheric structures of the Qinling-Dabie orogenic belt: Implications for deep subduction and delamination of continental lithosphere[J],2021,806.
APA	Zhao K.,Luo Y.,Yang Y.,&Yang X..(2021).High-resolution lithospheric structures of the Qinling-Dabie orogenic belt: Implications for deep subduction and delamination of continental lithosphere.Tectonophysics,806.
MLA	Zhao K.,et al."High-resolution lithospheric structures of the Qinling-Dabie orogenic belt: Implications for deep subduction and delamination of continental lithosphere".Tectonophysics 806(2021).