Three-dimensional electrical structure of the crust and upper mantle in Ordos Block and adjacent area

Evidence of regional lithospheric modification

Hao Dong*, Wenbo Wei, Gaofeng Ye, Sheng Jin, Alan G. Jones, Jianen Jing, Letian Zhang, Chengliang Xie, Fan Zhang, Hui Wang

*Corresponding author for this work

Research output: Contribution to journalArticle

38 Citations (Scopus)

Abstract

Long-period magnetotelluric (MT) data from project SINOPROBE were acquired and modeled, using three-dimensional (3D) MT inversion, to study the electrical structure of Ordos Block, a component of the North China Craton. For the first time, a high-resolution 3D resistivity model of the lithosphere is defined for the region. Contrary to what would be expected for a stable cratonic block, a prominent lithospheric conductive complex is revealed extending from the upper mantle to the mid-to-lower crust beneath the northern part of Ordos. Correlating well with results of seismic studies, the evidence from our independent magnetotelluric data supports regional modification of the lithosphere under the north Ordos and lithosphere thinning beneath Hetao Graben. The abnormally conductive structure may result from upwelling of mantle material in mid-to-late Mesozoic beneath the northern margin of the Ordos block. Key Points 3D Modeling of the Ordos Block using SINOPROBE magnetotelluric array dataset Conductor found beneath north Ordos suggests local lithosphere modification The modification may be relevant to the destruction of North China Craton

Original languageEnglish
Pages (from-to)2414-2425
Number of pages12
JournalGeochemistry, Geophysics, Geosystems
Volume15
Issue number6
DOIs
Publication statusPublished - Jun 2014
Externally publishedYes

Keywords

  • lithosphere modification
  • magnetotellurics
  • North China
  • Ordos Block
  • SINOPROBE

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