Thermochemical structure of the North China Craton from multi-observable   probabilistic inversion: Extent and causes of cratonic lithosphere   modification

doi:10.1016/j.gr.2016.07.002

CORC > 北京大学 > 地球与空间科学学院

	Thermochemical structure of the North China Craton from multi-observable probabilistic inversion: Extent and causes of cratonic lithosphere modification
	Guo, Zhen ; Afonso, Juan Carlos ; Qashqai, Mehdi Tork ; Yang, Yingjie ; Chen, Y. John
刊名	GONDWANA RESEARCH
	2016
关键词	Joint inversion North China Craton Ordos block Lithospheric thickness Sublithospheric convection Craton destruction SMALL-SCALE CONVECTION SINO-KOREAN CRATON GEOPHYSICAL OBSERVABLES MANTLE XENOLITHS WAVE TOMOGRAPHY IMAGED BENEATH CRUSTAL GROWTH EASTERN CHINA EVOLUTION DESTRUCTION
DOI	10.1016/j.gr.2016.07.002
英文摘要	We present a 3D thermochemical model of the North China Craton (NCC) from the surface down to 350 km by jointly inverting surface wave phase velocity data, geoid height, surface heat flow and absolute elevation with a multi-observable probabilistic inversion method. Our model reveals a thin (similar to 65-100 km) and chemically fertile lithosphere (87 < Mg# < 90) beneath the Eastern NCC, consistent with independent results from mantle xenoliths, and supports the idea that the Eastern NCC experienced significant lithospheric destruction and refertilization during the Phanerozoic. In contrast, beneath the Trans-North China Orogen, Inner Mongolia Suture Zone and Yinshan belt, we observe a more heterogeneous (chemically and thermally) lithosphere, indicating that these areas have been partly involved in lithospheric modification and mechanical erosion at multiple scales. A cold and chemically refractory (Mg# > 90) lithospheric mantle is imaged beneath the central TNCO and Ordos Block, reaching depths >260 km. This lithospheric "keel" is surrounded to the east by a high-temperature sublithospheric anomaly that originates at depths >280 km. The spatial distribution of this anomaly and its correlation with the location of recent volcanism in the region suggest that the anomaly represents a deep mantle upwelling being diverted by the cratonic keel and spreading onto regions of shallow lithosphere. Our results indicate that the present-day thermochemical structure beneath the NCC is the result of a complex interaction between a large-scale return flow associated with the subduction of the Pacific slab and the shallow lithospheric structure. (C) 2016 International Association for Gondwana Research. Published by Elsevier B.V. All rights reserved.; ARC [DP120102372]; Australian Research Council [FT130101220]; SCI(E); ARTICLE; juan.afonso@mq.edu.au; 252-265; 37
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/457524]
专题	地球与空间科学学院
推荐引用方式 GB/T 7714	Guo, Zhen,Afonso, Juan Carlos,Qashqai, Mehdi Tork,et al. Thermochemical structure of the North China Craton from multi-observable probabilistic inversion: Extent and causes of cratonic lithosphere modification[J]. GONDWANA RESEARCH,2016.
APA	Guo, Zhen,Afonso, Juan Carlos,Qashqai, Mehdi Tork,Yang, Yingjie,&Chen, Y. John.(2016).Thermochemical structure of the North China Craton from multi-observable probabilistic inversion: Extent and causes of cratonic lithosphere modification.GONDWANA RESEARCH.
MLA	Guo, Zhen,et al."Thermochemical structure of the North China Craton from multi-observable probabilistic inversion: Extent and causes of cratonic lithosphere modification".GONDWANA RESEARCH (2016).