globalchange  > 气候变化与战略
DOI: 10.1016/j.tecto.2021.228799
论文题名:
High-resolution lithospheric structures of the Qinling-Dabie orogenic belt: Implications for deep subduction and delamination of continental lithosphere
作者: Zhao K.; Luo Y.; Yang Y.; Yang X.
刊名: Tectonophysics
ISSN: 00401951
出版年: 2021
卷: 806
语种: 英语
中文关键词: 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
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.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/170944
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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

Recommended Citation:
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]. Tectonophysics,2021-01-01,806
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