气候变化领域集成服务门户(CCPortal): Crustal Footprint of Mantle Upwelling and Plate Amalgamation Revealed by Ambient Noise Tomography in Northern Vietnam and the Northern South China Sea

CCPortal

DOI	10.1029/2020JB020593
	Crustal Footprint of Mantle Upwelling and Plate Amalgamation Revealed by Ambient Noise Tomography in Northern Vietnam and the Northern South China Sea
	Yang X.; Yao H.; Huang B.-S.
发表日期	2021
ISSN	21699313
卷号	126 期号:2
英文摘要	A high-resolution crustal and uppermost mantle velocity model of northern Vietnam and the northern South China Sea (SCS) is essential for understanding the evolution of the SCS and its relationship to the Hainan plume, which is still controversial. Based on ambient seismic noise analysis, we processed ambient noise data from 65 broadband stations in southwestern China and northern Vietnam to obtain the crustal and uppermost mantle, S-wave velocity model, through the direct surface-wave tomography method, with a lateral resolution of 100–150 km. Our results show distinct lateral velocity variation at shallow crustal depths, such as significant low velocity in the Beibu Gulf Basin and the Yinggehai Basin and relatively higher velocity in Hainan Island. We suggest that the low velocity of the lower crust and uppermost mantle beneath the Yinggehai Basin indicates the present upwelling of upper mantle material. However, the observed high-velocity upheaval feature beneath the Leizhou Peninsula may represent the ancient magmatic underplating, which has a relation to the Hainan plume. Moreover, our results demonstrate different crustal structures of the two flanks of the Red River Fault, that is, in the middle and lower crust, the S-wave velocity in the region north of the Red River Fault is higher than that in the south. This may be associated with the collision and amalgamation of the South China and Indochina Blocks. In addition, our results also indicate a crustal footprint of the amalgamation of the Yangtze and Cathaysia Blocks. © 2021. American Geophysical Union. All Rights Reserved.
语种	英语
来源期刊	Journal of Geophysical Research: Solid Earth
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/187346
作者单位	School of Earth and Space Sciences, Laboratory of Seismology and Physics of Earth's Interior, University of Science and Technology of China, Hefei, China; CAS Center for Excellence in Comparative Planetology, University of Science and Technology of China, Hefei, China; Mengcheng National Geophysical Observatory, University of Science and Technology of China, Mengcheng, China; Institute of Earth Sciences, Academia Sinica, Taipei, Taiwan
推荐引用方式 GB/T 7714	Yang X.,Yao H.,Huang B.-S.. Crustal Footprint of Mantle Upwelling and Plate Amalgamation Revealed by Ambient Noise Tomography in Northern Vietnam and the Northern South China Sea[J],2021,126(2).
APA	Yang X.,Yao H.,&Huang B.-S..(2021).Crustal Footprint of Mantle Upwelling and Plate Amalgamation Revealed by Ambient Noise Tomography in Northern Vietnam and the Northern South China Sea.Journal of Geophysical Research: Solid Earth,126(2).
MLA	Yang X.,et al."Crustal Footprint of Mantle Upwelling and Plate Amalgamation Revealed by Ambient Noise Tomography in Northern Vietnam and the Northern South China Sea".Journal of Geophysical Research: Solid Earth 126.2(2021).