气候变化领域集成服务门户(CCPortal): Complex structure of upper mantle beneath the Yadong-Gulu rift in Tibet revealed by S-to-P converted waves

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DOI	10.1016/j.epsl.2019.115954
	Complex structure of upper mantle beneath the Yadong-Gulu rift in Tibet revealed by S-to-P converted waves
	Liu Z.; Tian X.; Yuan X.; Liang X.; Chen Y.; Zhu G.; Zhang H.; Li W.; Tan P.; Zuo S.; Wu C.; Nie S.; Wang G.; Yu G.; Zhou B.
发表日期	2020
ISSN	0012821X
卷号	531
英文摘要	The convergence between the Indian and Eurasian plates has produced the thick crust and uplifted the Tibetan plateau since about 50 Ma. However, the deformation of the mantle lithosphere is still a puzzle. The geometry of the subducting Indian mantle lithosphere beneath the plateau and the thickening or/and delamination of the Tibetan mantle lithosphere are the keys for understanding the continental collision process and the evolution of the plateau. However, knowledge has been restricted due to sparse data coverage in Tibet. In this study, S-wave receiver functions are calculated using tele-seismic waveforms recorded by two broadband arrays in central Tibet to image the lithospheric structure, mainly the depth variation of the lithosphere-asthenosphere boundary (LAB). Our results show that the depth of the Tibetan LAB decreases from ∼150 km in the west to ∼120 km in the east across the north-south trending Yadong-Gulu rift. Similarly, the LAB depth of the subducting Indian slab decreases from ∼270 km in the west to ∼200 km in the east, and the northernmost subducting Indian slab can be observed beneath the Bangong-Nujiang suture. These observations suggest that the thickness of the Tibetan lithosphere and the depth of the underlying Indian slab are segmented across the Yadong-Gulu rift in different degrees. The abrupt changes imply that the subducting Indian slab has been torn, which provided an upwelling channel for the asthenosphere contributing to the development of the rift. © 2019 The Author(s)
关键词	S-to-P converted waves structure of upper mantle Tibetan plateau Yadong-Gulu rift
英文关键词	Seismology; Shear waves; Bangong-Nujiang Suture; Continental collisions; Converted wave; Lithosphere-asthenosphere boundary; Lithospheric structure; Tibetan Plateau; Upper mantle; Yadong-Gulu rift; Structural geology; asthenosphere; continental collision; lithospheric structure; P-wave; plate tectonics; rift zone; S-wave; slab; subduction zone; upper mantle; China; Xizang
语种	英语
来源期刊	Earth and Planetary Science Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/202753
作者单位	State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, 100029, China; Innovation Academy for Earth Science, CAS, Beijing, 100029, China; CAS Center for Excellence in Tibetan Plateau Earth Sciences, Beijing, 100101, China; Deutsches GeoForschungsZentrum-GFZ, Telegrafenberg, Potsdam, 14473, Germany; Earth System Science Programme, Faculty of Science, Chinese University of Hong Kong, Hong Kong; Institute of Geology, Chinese Academy of Geological Sciences, Beijing, 100037, China; Institute of Disaster Prevention, Sanhe, Hebei 065201, China; University of Chinese Academy of Sciences, Beijing, 100049, China
推荐引用方式 GB/T 7714	Liu Z.,Tian X.,Yuan X.,et al. Complex structure of upper mantle beneath the Yadong-Gulu rift in Tibet revealed by S-to-P converted waves[J],2020,531.
APA	Liu Z..,Tian X..,Yuan X..,Liang X..,Chen Y..,...&Zhou B..(2020).Complex structure of upper mantle beneath the Yadong-Gulu rift in Tibet revealed by S-to-P converted waves.Earth and Planetary Science Letters,531.
MLA	Liu Z.,et al."Complex structure of upper mantle beneath the Yadong-Gulu rift in Tibet revealed by S-to-P converted waves".Earth and Planetary Science Letters 531(2020).