气候变化领域集成服务门户(CCPortal): Crustal deformation in the southeastern margin of the Tibetan Plateau: insights from broad-band Pg-wave attenuation tomography

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DOI	10.1093/gji/ggad404
	Crustal deformation in the southeastern margin of the Tibetan Plateau: insights from broad-band Pg-wave attenuation tomography
	Li, Ruo-Jie; Zhao, Lian-Feng; Xie, Xiao-Bi; Yao, Zhen-Xing
发表日期	2023
ISSN	0956-540X
EISSN	1365-246X
起始页码	2870
结束页码	2886
卷号	235 期号:3
英文摘要	The deformation mechanism in southeastern Tibet since the continental collision between the Indian and Eurasian plates could be explained by several models, including two major classic end-member models, the rigid-block extrusion model and the crustal flow model. Crustal channel flow is likely an important tectonic regime for properly explaining a large number of geological and geophysical observations but remains in competition with the block extrusion model. Consequently, detecting ductile flow connectivity would play a key role in understanding the tectonic evolution of the southeastern Tibetan Plateau. Here, we established a high-resolution broad-band QPg model for the crust in SE Tibet by using a joint inversion tomography method based on both single- and two-station Pg data. We verified the stability of the QPg tomography by comparing the QPg values at 1 Hz between the joint inversion and the two-station method. Two low-QPg zones were observed, isolated by the high-QPg Emeishan large igneous province (ELIP). Strong Pg attenuation beneath the Songpan-Ganzi Block and Western Sichuan Block may indicate the presence of crustal material flow due to relatively weak rheological strength. Cooled basaltic magma remnants in the inner zone of the ELIP likely block the southeastward migration of crustal materials driven by the gravity and lateral pressure gradient, and restrict the flow to the Western Sichuan Block, resulting in surface uplift and crustal thickening. Strong Pg attenuation near the Xiaojiang Fault and the Red River Fault may result from mantle upwelling in this region. Our QPg model, combined with previous results, suggests that the tectonic deformation in the southeastern Tibetan Plateau has been mainly controlled by the effects of crustal channel flow and asthenospheric upwelling since the Late Miocene.
关键词	Asia Body waves Seismic attenuation Seismic tomography Crustal structure Large igneous provinces
英文关键词	BENEATH SE TIBET; REGIONAL SEISMIC PHASES; LARGE IGNEOUS PROVINCE; LG ATTENUATION; SPECTRAL CHARACTERISTICS; SOUTHWEST CHINA; JOINT INVERSION; UNITED-STATES; HEAT-FLOW; SW CHINA
WOS研究方向	Geochemistry & Geophysics
WOS记录号	WOS:001124759000005
来源期刊	GEOPHYSICAL JOURNAL INTERNATIONAL
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/283582
作者单位	Chinese Academy of Sciences; Institute of Geology & Geophysics, CAS; Chinese Academy of Sciences; University of Chinese Academy of Sciences, CAS; Chinese Academy of Sciences; Institute of Geology & Geophysics, CAS; University of California System; University of California Santa Cruz
推荐引用方式 GB/T 7714	Li, Ruo-Jie,Zhao, Lian-Feng,Xie, Xiao-Bi,et al. Crustal deformation in the southeastern margin of the Tibetan Plateau: insights from broad-band Pg-wave attenuation tomography[J],2023,235(3).
APA	Li, Ruo-Jie,Zhao, Lian-Feng,Xie, Xiao-Bi,&Yao, Zhen-Xing.(2023).Crustal deformation in the southeastern margin of the Tibetan Plateau: insights from broad-band Pg-wave attenuation tomography.GEOPHYSICAL JOURNAL INTERNATIONAL,235(3).
MLA	Li, Ruo-Jie,et al."Crustal deformation in the southeastern margin of the Tibetan Plateau: insights from broad-band Pg-wave attenuation tomography".GEOPHYSICAL JOURNAL INTERNATIONAL 235.3(2023).