New constraints on structures of the mantle transition zone beneath the Trans-north China orogen and western north China craton revealed by receiver functions

•The 410-km and 660-km discontinuities beneath the TNCO and western NCC present a significantly topographic relief.•The hot mantle upwelling is responsible for the mechanism of the Datong volcano and lithospheric thinning beneath the northern TNCO.•The southern TNCO and WNCC preserve their original...

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Bibliographic Details
Published in:Journal of Asian earth sciences 2023-04, Vol.245, p.105554, Article 105554
Main Authors: Xu, Xiaoming, Ding, Zhifeng, Niu, Fenglin
Format: Article
Language:English
Subjects:
Delamination
Mantle Transition Zone
Mantle upwelling
North China Craton
Receiver function
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Summary:•The 410-km and 660-km discontinuities beneath the TNCO and western NCC present a significantly topographic relief.•The hot mantle upwelling is responsible for the mechanism of the Datong volcano and lithospheric thinning beneath the northern TNCO.•The southern TNCO and WNCC preserve their original structures of the MTZ. We calculated a total of 109,654 receiver functions from 848 teleseismic events recorded by two dense seismic arrays with 672 stations in the trans-north China orogen (TNCO) and western North China Craton (NCC). After moveout correction based on the 3-D crustal and mantle models, the common conversion point (CCP) stacking method was used to image the structures of the mantle transition zone (MTZ). The topographic reliefs of the 410-km and 660-km discontinuities exhibit significant spatial variations across the study area. The average 10 km depression of the 410-km discontinuity is observed under the regions from the Datong volcano to the Yin mountain, which may result from the hot mantle materials. The about 10 km uplift of the 410-km discontinuity and 15 km MTZ thickening are likely to be caused by the lithospheric delamination beneath the Abaga and Dalinor volcano regions. The almost flat topography of the two discontinuities and normal MTZ thickness of 250 km under the Ordos block and its southwestern regions indicate that the original structures of the MTZ are well maintained. Our obtained structures of the MTZ provide new constraints on the mantle dynamic process and tectonic evolution beneath the TNCO and western NCC.
ISSN:1367-9120
1878-5786
DOI:10.1016/j.jseaes.2023.105554