Articles | Volume 8, issue 6
Solid Earth, 8, 1141–1151, 2017
https://doi.org/10.5194/se-8-1141-2017
Solid Earth, 8, 1141–1151, 2017
https://doi.org/10.5194/se-8-1141-2017

Research article 03 Nov 2017

Research article | 03 Nov 2017

Mantle roots of the Emeishan plume: an evaluation based on teleseismic P-wave tomography

Chuansong He1 and M. Santosh2,3 Chuansong He and M. Santosh
  • 1Institute of Geophysics, China Earthquake Administration, Beijing 100081, China
  • 2Centre for Tectonics, Resources and Exploration, Department of Earth Sciences, University of Adelaide, Adelaide, SA 5005, Australia
  • 3School of Earth Sciences and Resources, China University of Geosciences Beijing, 29 Xueyuan Road, Beijing 100083, China

Abstract. The voluminous magmatism associated with large igneous provinces (LIPs) is commonly correlated to upwelling plumes from the core–mantle boundary (CMB). Here we analyse seismic tomographic data from the Emeishan LIP in southwestern China. Our results reveal vestiges of delaminated crustal and/or lithospheric mantle, with an upwelling in the upper mantle beneath the Emeishan LIP rather than a plume rooted in the CMB. We suggest that the magmatism and the Emeishan LIP formation might be connected with the melting of delaminated lower crustal and/or lithospheric components which resulted in plume-like upwelling from the upper mantle or from the mantle transition zone.

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Short summary
Our work demonstrated that the Emeishan large igneous province was generated by the crustal and/or mantle lithospheric delamination rather than the upwelling mantle plume.