DOI: 10.1016/j.tecto.2021.229007
论文题名: A fine crustal structure and geodynamics revealed by receiver functions along the Guangchang-Putian line in the Cathaysia Block, South China
作者: Zhang Y. ; Shi D. ; Lü Q. ; Xu Y. ; Xu Z. ; Gong X. ; Yan J. ; Xu T.
刊名: Tectonophysics
ISSN: 00401951
出版年: 2021
卷: 815 语种: 英语
中文关键词: Cathaysia Block
; Crustal structure
; Receiver function
; South China
; Zhenghe-Dapu fault
英文关键词: Mineralogy
; Plates (structural components)
; Seismic waves
; Crustal deformations
; Crustal structure
; Geodynamic evolution
; Magmatism and mineralizations
; Receiver functions
; Seismic observation
; Structural boundary
; Velocity gradients
; Geodynamics
英文摘要: The Cathaysia Block is located in South China, along the western margin of the Pacific plate, and well known for its widespread granitoids and rich poly-metallic mineralization. Despite the numerous studies conducted in this region, some key questions are still in debate, which revolve around the detailed crustal architecture, the boundary between the western and eastern part of Cathaysia Block, and the geodynamic evolution and metallogenic settings in the Cathaysia Block. In this study, we have conducted a dense broad-band seismic observation in the Cathaysia Block, and obtained the fine crustal structure of it by using P-wave receiver functions and analyzing other geophysical and geological studies comprehensively. Our study has following findings: (1) the crust of the Cathaysia Block is ~31.5 km thick, thinner than that of the global continent, and is interpreted to have been thinned since the Late Mesozoic; (2) the Vp/Vs ratio of the Cathaysia Block is lower than that of the global continent, which implies there is no extensive underplating beneath the Cathaysia Block, or that the magma may be confined at bottom of the crust and formed a velocity gradient belt around Moho; (3) Zhenghe-Dapu fault is marked as the structural boundary between the western and eastern Cathaysia Block; (4) the western and eastern Cathaysia Block have different intra-crustal structures, petrochronology features and mineralization settings; (5) the subduction of the paleo-Pacific plate and the following roll-back could be responsible for the geodynamic evolution of the crustal deformation, as well as the widespread magmatism and mineralization. © 2021 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/170942
Appears in Collections: 气候变化与战略
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作者单位: Chinese Academy of Geological Sciences, Beijing, 100037, China; China Deep Exploration Center-SinoProbe Center, China Geological Survey & Chinese Academy of Geological Sciences, Beijing, 100037, China; Stake Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, 100029, China
Recommended Citation:
Zhang Y.,Shi D.,Lü Q.,et al. A fine crustal structure and geodynamics revealed by receiver functions along the Guangchang-Putian line in the Cathaysia Block, South China[J]. Tectonophysics,2021-01-01,815