气候变化领域集成服务门户(CCPortal): Southern Tibetan rifting since late Miocene enabled by basal shear of the underthrusting Indian lithosphere

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DOI	10.1038/s41467-023-38296-w
	Southern Tibetan rifting since late Miocene enabled by basal shear of the underthrusting Indian lithosphere
	Zhang, Bingfeng; Bao, Xuewei; Wu, Yingkai; Xu, Yixian; Yang, Wencai
发表日期	2023
EISSN	2041-1723
卷号	14 期号:1
英文摘要	Syncontractional extension is prominent in present-day Tibet, but its origin remains vigorously debated. Several deep-seated geodynamic processes (e.g., Indian underthrusting, horizontal flow, and mantle upwelling) have been linked to Tibetan rifting. Indian underthrusting is a good candidate because it can well explain why surface rifts are more prominent south of the Bangong-Nujiang suture; however, how Indian underthrusting causes extension is not well understood and lacks observational constraints. Seismic anisotropy, measured by exploiting the birefringence effect of shear waves, can be indicative of the deformation styles within the crust. Here, we unveil the dominant convergence-parallel alignment of anisotropic fabrics in the deep crust of the southern Tibetan rifts using seismic recordings collected from our recently deployed and existing seismic stations. This finding suggests that the strong north-directed shearing exerted by the underthrusting Indian plate is key to enabling present-day extension in southern Tibet. This study presents constraints on seismic anisotropy properties in western-central Tibet, revealing pronounced north-directed basal shearing beneath the rifts in the southern plateau that sheds light on the cause of syncontractional extension there.
英文关键词	BENEATH WESTERN TIBET; CRUSTAL SEISMIC ANISOTROPY; STRIKE-SLIP FAULTS; COLLISION ZONE; UPPER-MANTLE; DEFORMATION; SUBDUCTION; EXTENSION; CONFIGURATION; CONVERGENCE
WOS研究方向	Multidisciplinary Sciences
WOS记录号	WOS:000987319700001
来源期刊	NATURE COMMUNICATIONS
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/283501
作者单位	Zhejiang University
推荐引用方式 GB/T 7714	Zhang, Bingfeng,Bao, Xuewei,Wu, Yingkai,et al. Southern Tibetan rifting since late Miocene enabled by basal shear of the underthrusting Indian lithosphere[J],2023,14(1).
APA	Zhang, Bingfeng,Bao, Xuewei,Wu, Yingkai,Xu, Yixian,&Yang, Wencai.(2023).Southern Tibetan rifting since late Miocene enabled by basal shear of the underthrusting Indian lithosphere.NATURE COMMUNICATIONS,14(1).
MLA	Zhang, Bingfeng,et al."Southern Tibetan rifting since late Miocene enabled by basal shear of the underthrusting Indian lithosphere".NATURE COMMUNICATIONS 14.1(2023).