Seismic imaging of the crust and upper mantle beneath the North China Craton

You Tian, Dapeng Zhao, Ruomei Sun, Jiwen Teng

Research output: Contribution to journalArticle

182 Citations (Scopus)

Abstract

We determined three-dimensional (3D) P-wave velocity structure down to 600 km depth beneath the North China Craton using 149,054 arrival times from 7940 local and regional earthquakes, and 193,085 data from 12,657 teleseismic events, which were recorded by 585 seismic stations in our study region. Our tomographic images show some new features. Prominent low-velocity (low-V) and high-velocity (high-V) anomalies are imaged beneath the North China Basin, Trans-North China Orogen, and the cratonic Ordos Block. A lithospheric root of over 250 km thick is imaged clearly beneath the Ordos block. A high-V anomaly which may represent the subducting Pacific slab is imaged in the mantle transition zone beneath the eastern edge of the study area. A few other high-V zones are also imaged in the deep portion of the upper mantle, which may reflect the stagnant Pacific slab and detached Archaean continental lithosphere. Two prominent low-V anomalies are imaged beneath the North China Basin, which may reflect asthenospheric upwelling associated with the deep subduction of the Farallon and Pacific plates since late Mesozoic. We consider that the lithospheric thinning of the eastern part of the North China Craton was caused by the long-term replacement, metamorphism, and chemical and thermal erosion of the ancient lithosphere by the hot asthenosphere. Crown

Original languageEnglish
Pages (from-to)169-182
Number of pages14
JournalPhysics of the Earth and Planetary Interiors
Volume172
Issue number3-4
DOIs
Publication statusPublished - 2009 Feb 1

Keywords

  • Asthenospheric upwelling
  • Crust and mantle heterogeneity
  • North China Craton
  • Seismic tomography

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Geophysics
  • Physics and Astronomy (miscellaneous)
  • Space and Planetary Science

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