Thick crust beneath the Ordos plateau: Implications for instability of   the North China craton

doi:10.1016/j.epsl.2012.09.027

CORC > 北京大学 > 地球与空间科学学院

	Thick crust beneath the Ordos plateau: Implications for instability of the North China craton
	Yu, Chun-Quan ; Chen, Wang-Ping ; Ning, Jie-Yuan ; Tao, Kai ; Tseng, Tai-Lin ; Fang, Xin-Ding ; Chen, Yongshun John ; van der Hilst, Robert D.
刊名	earth and planetary science letters
	2012
关键词	North China craton crustal thickness Moho Conrad discontinuity decratonization SINO-KOREAN CRATON LITHOSPHERE BENEATH CONTINENTAL-CRUST VELOCITY STRUCTURE RECEIVER FUNCTIONS EVOLUTION BASIN TECTOSPHERE STABILITY MIGRATION
DOI	10.1016/j.epsl.2012.09.027
英文摘要	Surrounded by seismicity and other manifestations of active deformation, the Ordos plateau, or the western portion of the North China craton (NCC), is a uniquely stable terrane in Asia. Results from virtual deep-seismic sounding and crustal receiver functions suggests that the crust under the eastern Ordos is thicker (at least 60 km) than expected from previous studies and from its modest elevation (similar to 1500 m above sea-level). Receiver functions also reveal a pronounced elastic impedance contrast within the crust (at similar to 40 km depth), which we interpret as the Conrad discontinuity. The presence of a 20 km thick layer of mafic lower crust between the Conrad and Moho discontinuities would maintain crustal isostasy. The similar to 1000 km long seismic profile from the Ordos plateau in the west to the North China basin in the east reveals that crustal thickness changes by almost a factor of two across the active Shanxi rift in central NCC (over a distance of only about 100 km). Insofar the current configuration of the lithosphere under the Ordos plateau might serve as a proxy for the initial condition prior to reactivation of the eastern part of NCC where a cratonic keel no longer seems to exist our results support the hypothesis that lower crust foundering was due to transformation of a thick mafic lower-crust to a garnet-rich assemblage (possibly caused by hydration associated with subduction during and/or before mid-Mesozoic times). (C) 2012 Elsevier B.V. All rights reserved.; Geochemistry & Geophysics; SCI(E); EI; 9; ARTICLE; 366-375; 357
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/228792]
专题	地球与空间科学学院
推荐引用方式 GB/T 7714	Yu, Chun-Quan,Chen, Wang-Ping,Ning, Jie-Yuan,et al. Thick crust beneath the Ordos plateau: Implications for instability of the North China craton[J]. earth and planetary science letters,2012.
APA	Yu, Chun-Quan.,Chen, Wang-Ping.,Ning, Jie-Yuan.,Tao, Kai.,Tseng, Tai-Lin.,...&van der Hilst, Robert D..(2012).Thick crust beneath the Ordos plateau: Implications for instability of the North China craton.earth and planetary science letters.
MLA	Yu, Chun-Quan,et al."Thick crust beneath the Ordos plateau: Implications for instability of the North China craton".earth and planetary science letters (2012).