气候变化领域集成服务门户(CCPortal): Crustal velocity structure of Cathaysia Block from an active-source seismic profile between Wanzai and Hui'an in SE China

CCPortal

DOI	10.1016/j.tecto.2021.228874
	Crustal velocity structure of Cathaysia Block from an active-source seismic profile between Wanzai and Hui'an in SE China
	Lin J.; Xu T.; Cai H.; Lü Q.; Bai Z.; Deng Y.; Zhang Y.; Huang M.; Badal J.; Jin X.
发表日期	2021
ISSN	00401951
卷号	811
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.
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
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/208012
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
推荐引用方式 GB/T 7714	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],2021,811.
APA	Lin J..,Xu T..,Cai H..,Lü Q..,Bai Z..,...&Jin X..(2021).Crustal velocity structure of Cathaysia Block from an active-source seismic profile between Wanzai and Hui'an in SE China.Tectonophysics,811.
MLA	Lin J.,et al."Crustal velocity structure of Cathaysia Block from an active-source seismic profile between Wanzai and Hui'an in SE China".Tectonophysics 811(2021).