Three-dimensional electrical structure of the crust and upper mantle in Ordos Block and adjacent area: Evidence of regional lithospheric modification

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...

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Published in:Geochemistry, geophysics, geosystems : G3 geophysics, geosystems : G3, 2014-06, Vol.15 (6), p.2414-2425
Main Authors: Dong, Hao, Wei, Wenbo, Ye, Gaofeng, Jin, Sheng, Jones, Alan G., Jing, Jianen, Zhang, Letian, Xie, Chengliang, Zhang, Fan, Wang, Hui
Format: Article
Language:English
Subjects:
Blocking
China
Cratons
Crusts
Isotopes
Lithosphere
lithosphere modification
Magma
magnetotellurics
Mantle
Mesozoic
North China
Ordos Block
Regional
Seismology
SINOPROBE
Three dimensional
Three dimensional models
Upper mantle
Upwelling
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Summary: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
ISSN:1525-2027
1525-2027
DOI:10.1002/2014GC005270