气候变化领域集成服务门户(CCPortal): Decoding the Emeishan Permian mantle plume in the southeastern margin of Tibet from the seismic signature of the local lithosphere

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DOI	10.1093/gji/ggac327
	Decoding the Emeishan Permian mantle plume in the southeastern margin of Tibet from the seismic signature of the local lithosphere
	Hu, Jiafu; Yang, Haiyan; Badal, Jose; Peng, Hengchu; Miaowanf, Suqiu
发表日期	2023
ISSN	0956-540X
EISSN	1365-246X
起始页码	81
结束页码	96
卷号	232 期号:1
英文摘要	The Emeishan large igneous province (ELIP), which is located along the southeastern margin of Tibet, is widely regarded as the erosional remnants of voluminous Permian mafic volcanic successions that were associated with mantle plume activity. In addition, evidence for the eruption of the mantle plume and its signature of lithospheric modification should have been retained in the lithosphere after cooling of the plume. Here we use calculated compressional- and shear wave receiver functions (PRFs and SRFs, respectively) from >750 broad-band stations, together with heat flow and Bouguer gravity anomaly data, to investigate the seismic signature within the lithosphere beneath the southeastern margin of Tibet. Our results from the inner zone (INZ) of the ELIP indicate that the similar to 60 km depth of the Moho interpreted from depth-migrated PRF images is consistent with that inferred from SRFs and is deeper than that in the region surrounding the INZ, which shows a continuous positive converted phase at similar to 35-40 km depth. The crustal geometry and physical properties show a 15-20-km-thick mafic underplated layer that extends for 150-200 km in the E-W direction and similar to 400 km in the N-S direction along the base of the crust in the northeastern INZ and its surrounding region. We interpret the underplated layer as the concealed Emeishan plume hotspot track and suggest that the head of the postulated mantle plume is centred approximately beneath Panzhihua City and its surroundings. We propose a new geodynamic model for the formation of the ELIP, in which the lower-middle crust has been strengthened by voluminous mafic intrusions and underplating, whereas the Yangtze Craton in the plume region has been destroyed by removing the base of the lithosphere.
关键词	Heat flow Gravity anomalies and Earth structure Crustal imaging Interface waves Dynamics of lithosphere and mantle Large igneous provinces
英文关键词	LARGE IGNEOUS PROVINCE; CONTINENTAL-CRUST; POISSONS RATIO; EASTERN MARGIN; CHINA; DEFORMATION; EVOLUTION; PLATEAU; SICHUAN; GROWTH
WOS研究方向	Geochemistry & Geophysics
WOS记录号	WOS:000853930000007
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/283139
作者单位	Yunnan University; University of Zaragoza
推荐引用方式 GB/T 7714	Hu, Jiafu,Yang, Haiyan,Badal, Jose,et al. Decoding the Emeishan Permian mantle plume in the southeastern margin of Tibet from the seismic signature of the local lithosphere[J],2023,232(1).
APA	Hu, Jiafu,Yang, Haiyan,Badal, Jose,Peng, Hengchu,&Miaowanf, Suqiu.(2023).Decoding the Emeishan Permian mantle plume in the southeastern margin of Tibet from the seismic signature of the local lithosphere.GEOPHYSICAL JOURNAL INTERNATIONAL,232(1).
MLA	Hu, Jiafu,et al."Decoding the Emeishan Permian mantle plume in the southeastern margin of Tibet from the seismic signature of the local lithosphere".GEOPHYSICAL JOURNAL INTERNATIONAL 232.1(2023).