A relic thickened crustal root beneath the Cenozoic rift zone of the NW Ordos margin, North China, revealed by receiver functions

We investigate the crustal structure and Moho topography beneath the northwest Ordos rift zone by employing receiver functions analysis at dense broadband seismic stations. The results delineate a depressed Moho zone (by ∼5 km) beneath the Cenozoic rifts, which is unconventional for classical contin...

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Bibliographic Details
Published in:Physics of the earth and planetary interiors 2022-12, Vol.333, p.106953, Article 106953
Main Authors: Hu, Xuzhi, Xu, Mijian, Xu, Mingjie, Zhang, Yueqiao, Huang, Zhouchuan
Format: Article
Language:English
Subjects:
CCP stacking
Moho topography
Ordos block
Receiver functions
Relic crustal root
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Summary:We investigate the crustal structure and Moho topography beneath the northwest Ordos rift zone by employing receiver functions analysis at dense broadband seismic stations. The results delineate a depressed Moho zone (by ∼5 km) beneath the Cenozoic rifts, which is unconventional for classical continental rift zones. We interpret this depressed Moho zone as a relict of the thickened crustal root formed during the intracontinental orogeny in late Mesozoic. The Cenozoic rift has not yet reequilibrated the crustal-mantle boundary possibly due to the lack of decompressional melting during the lithospheric extension. [Display omitted] •Depressed Moho beneath NW Ordos Cenozoic rift is mapped by CCP stacking prifiles•The relic crustal root was formed in late Mesozoic intracontinental orogeny.•The crustal-mantle boundary has not reequilibrated by decompressional melting
ISSN:0031-9201
1872-7395
DOI:10.1016/j.pepi.2022.106953