气候变化领域集成服务门户(CCPortal): Eastward Dipping Style of the Underthrusting Indian Lithosphere Beneath the Tethyan Himalaya Illuminated by P and S Receiver Functions

CCPortal

DOI	10.1029/2020JB021219
	Eastward Dipping Style of the Underthrusting Indian Lithosphere Beneath the Tethyan Himalaya Illuminated by P and S Receiver Functions
	Xu Q.; Liu H.; Yuan X.; Zhao J.; Pei S.
发表日期	2021
ISSN	21699313
卷号	126 期号:1
英文摘要	To explore the west-east variations in the underthrusting Indian lithosphere, we investigate the lithospheric structure using P and S receiver functions obtained from a west-east linear array of 19 broadband stations spanning the Tethyan Himalaya at 85.5–88.5°E. Our observations of the Main Himalayan Thrust (MHT) and Moho serving as the top and bottom boundaries at depths of 42–54 km and 60–72 km, respectively, suggest that a thinning Indian lower crust with an eastward inclined geometry is underthrusting beneath the Tethyan Himalaya. An intra-crustal low velocity zone (LVZ) immediately above the MTH at depths of 32–42 km is imaged, likely resulting from the presence of crustal dehydration partial melting. We propose that this LVZ induces the southward extrusion of melt-weakened crustal material with itself as a channel and facilitates the development of duplexing structures, by which Indian lower crustal materials could be accreted into the Himalayan wedge along the north-south mid-crustal ramp in the MHT. The eastward dipping lithosphere-asthenosphere boundary is clearly observed ranging from 90 to 126 km, which generally coincides with the changing trends of the MHT and Moho. These observations can be attributed to the eastward steepening subduction angle of the Indian lithosphere. © 2020. American Geophysical Union. All Rights Reserved.
英文关键词	eastward deepening; LAB; Main Himalayan Thrust; receiver functions; Tethyan Himalaya
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/187435
作者单位	Key Laboratory of Continental Collision and Plateau Uplift, Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing, China; CAS Center for Excellence in Tibetan Plateau Earth Sciences, Beijing, China; Deutsches GeoForschungsZentrum GFZ, Telegrafenberg, Potsdam, Germany
推荐引用方式 GB/T 7714	Xu Q.,Liu H.,Yuan X.,et al. Eastward Dipping Style of the Underthrusting Indian Lithosphere Beneath the Tethyan Himalaya Illuminated by P and S Receiver Functions[J],2021,126(1).
APA	Xu Q.,Liu H.,Yuan X.,Zhao J.,&Pei S..(2021).Eastward Dipping Style of the Underthrusting Indian Lithosphere Beneath the Tethyan Himalaya Illuminated by P and S Receiver Functions.Journal of Geophysical Research: Solid Earth,126(1).
MLA	Xu Q.,et al."Eastward Dipping Style of the Underthrusting Indian Lithosphere Beneath the Tethyan Himalaya Illuminated by P and S Receiver Functions".Journal of Geophysical Research: Solid Earth 126.1(2021).