globalchange  > 气候变化与战略
DOI: 10.1016/j.tecto.2021.228874
论文题名:
Crustal velocity structure of Cathaysia Block from an active-source seismic profile between Wanzai and Hui'an in SE China
作者: Lin J.; Xu T.; Cai H.; Lü Q.; Bai Z.; Deng Y.; Zhang Y.; Huang M.; Badal J.; Jin X.
刊名: Tectonophysics
ISSN: 00401951
出版年: 2021
卷: 811
语种: 英语
中文关键词: Cathaysia ; P-wave velocity structure ; SE China ; Tectonic boundaries ; Wide-angle reflection and refraction
英文关键词: Acoustic wave velocity ; Faulting ; Plates (structural components) ; Seismology ; Structural geology ; Volcanic rocks ; Wave propagation ; Crustal velocity structure ; Extensional tectonics ; Lateral velocities ; Lithospheric thinning ; Low velocity layers ; Seismic velocities ; Tectonic boundaries ; Wide-angle reflection ; Seismic waves ; crustal structure ; P-wave ; seismic reflection ; seismic refraction ; seismic source ; seismic velocity ; tectonic setting ; velocity structure ; Cathaysia Block ; China ; Fujian ; Huian
英文摘要: With the purpose of exploring the widely distributed Mesozoic granitoids in SE China and the related mineralization, we carried out a new 530-km-long seismic wide-angle reflection and refraction (WARR) profile along the transect Wanzai- Hui'an. Based on a previous exploration in 2012 and the analysis of this WARR profile, we have deduced a detailed P-wave velocity model of the crust and uppermost mantle. The main results are: (1) The crustal thickness is about 30 to 32 km beneath the Yangtze Block and West Cathaysia, and 29 to 30 km below the East Cathaysia, which represents a significant thinning with respect to the worldwide average thickness of shields and platforms. (2) The variation in seismic velocity between the upper crust and middle-lower crust in the Yangtze Block and the Cathaysia Blocks indicates that the Shaoxing-Jiangshan-Pingxiang Fault (SJPF) is the tectonic boundary between the Yangtze and Cathaysia and the Zhenghe-Dapu Fault (ZDF) is the tectonic boundary between the west and east Cathaysia. (3) The middle crust exhibits a low P-wave velocity layer of 6.2 km/s below the Wuyishan Metallogenic Belt (WMB). This low velocity layer can be attributed to the delamination during the Caledonian orogeny and the Yanshanian extension. (4) The middle-lower crust shows a clear lateral velocity variation from west to east in Cathaysia. The subduction of the Paleo-Pacific plate is believed to be the main reason for the extensional tectonic environment and magmatism during the Yanshanian (Jurassic-Cretaceous) period, leading to significant crustal and lithospheric thinning. Relatively high velocity in the middle-lower crust and widely disseminated Cretaceous volcanic rocks in East Cathaysia may be related to the slab rollback of the Paleo-Pacific plate in the late Yanshanian (Cretaceous) period. © 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/170845
Appears in Collections:气候变化与战略

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作者单位: State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, 100029, China; Geophysical Exploration Center, China Earthquake Administration, Zhengzhou, 450002, China; Earthquake Administration of Fujian Province, Fuzhou, 350003, China; Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing, 100037, China; State Key Laboratory of Isotope Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou, 510640, China; University of Chinese Academy of Sciences, Beijing, 100049, China; Innovation Academy for Earth Science, Chinese Academy of Sciences, Beijing, 100029, China; Physics of the Earth, Sciences B, University of Zaragoza, Pedro Cerbuna 12, Zaragoza, 50009, Spain

Recommended Citation:
Lin J.,Xu T.,Cai H.,et al. Crustal velocity structure of Cathaysia Block from an active-source seismic profile between Wanzai and Hui'an in SE China[J]. Tectonophysics,2021-01-01,811
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