globalchange  > 气候变化与战略
DOI: 10.1016/j.tecto.2020.228365
论文题名:
Crustal structure and magmatic evolution in the Pearl River Delta of the Cathaysia Block: New constraints from receiver function modeling
作者: Huang H.; Xiong H.; Qiu X.; Li Y.
刊名: Tectonophysics
ISSN: 00401951
出版年: 2020
卷: 778
语种: 英语
英文关键词: Acoustic wave velocity ; Delta functions ; Gems ; Rivers ; Seismic waves ; Wave propagation ; Continental crusts ; Crustal thickness ; Magmatic evolution ; Metamorphic grade ; Pearl River delta ; Positive correlations ; Receiver functions ; Waveform modeling ; Structural geology ; continental crust ; crustal structure ; crustal thickness ; extensional tectonics ; fault zone ; magmatic differentiation ; P-wave ; stacking ; structural geology ; wave velocity ; Cathaysia Block ; China ; Guangdong ; Zhujiang Delta
英文摘要: We utilized receiver functions to study the crustal structure beneath the Pearl River Delta in the southwestern part of the Cathaysia Block, which was characterized by widespread tectono-magmatism during the late Mesozoic. Combination of waveform modeling and H-k stacking was used to derive crustal thickness, Vp/Vs ratio and average P-wave velocity. The results show that the crustal thickness ranges from 26 km in the center of the Pearl River Delta to 32 km in the periphery; the Vp/Vs ratio is between ~1.70 and 1.74. The average P-wave velocity ranges from 6.4 to 6.8 km/s and shows higher value beneath the islands along the Lianhuashan Fault zone. A weakly positive correlation between the crustal thickness and Vp/Vs ratio is observed in southwestern Pearl River Delta, indicating depth-dependent extension of the continental crust, that is, ductile lower crust was stretched to a much higher degree in comparison with the brittle felsic upper crust. The crust in the northeastern Pearl River Delta may be more basaltic owing to underplating caused by the subduction of the Paleo-Pacific Plate, and thus a relatively high Vp/Vs ratio is observed there. The overall low crustal Vp/Vs ratio and the relatively higher crustal P-wave velocities beneath the Lianhuashan Fault zone may imply a felsic-intermediate composition and high metamorphic grade of the crust along the fault. The Lianhuashan Fault zone may provide a pathway for rapid magmatic transportation from the underplating beneath the crust to the surface. © 2020 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/170608
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作者单位: CAS Key Laboratory of Ocean and Marginal Sea Geology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou, China; Seismic Station of SZN (Shenzhen), China Earthquake Administration, Shenzhen, China; South Marine Science and Engineering Guangdong Laboratory (Guangzhou), Guangzhou, China; Innovation Academy of South China Sea Ecology and Environmental Engineering, Chinese Academy of Sciences, Guangzhou, 510301, China; College of Earth and Planetary Sciences, University of Chinese Academy of Science, Beijing, China

Recommended Citation:
Huang H.,Xiong H.,Qiu X.,et al. Crustal structure and magmatic evolution in the Pearl River Delta of the Cathaysia Block: New constraints from receiver function modeling[J]. Tectonophysics,2020-01-01,778
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