Preprints
https://doi.org/10.5194/egusphere-2024-3219
https://doi.org/10.5194/egusphere-2024-3219
11 Nov 2024
 | 11 Nov 2024
Status: this preprint is open for discussion.

Origin of Changbaishan volcano inferred from simulation of the Cenozoic Pacific plate subduction using geodynamic models with data assimilation

Tao Zhu, Yingxing Guo, Yueyang Xia, and Chao Dong

Abstract. The Changbaishan volcano has been considered a giant active intraplate volcano with hidden potentially disastrous eruptive risks, so its origin has attracted widespread attention from all over the world. However, this issue has not been adequately settled down due to its complexity. So far, three primary conceptual mechanisms have been proposed based on seismic tomography and geochemistry. All three mechanisms have been considered to be correlated with the subduction of the Pacific plate. Therefore, we use the best-fit thermochemical geodynamic model with data assimilation, which was determined by tracking the seismically inferred structure of the subducted Pacific slab beneath the Changbaishan volcanic province (CVP), to assess the their relative significance. The findings suggest that the super-hydrous melts in the mantle atop the Pacific slab, resulting from the slab dehydration in the mantle transition zone (MTZ), may primarily contribute to the volcanism of the Changbaishan volcano. Meanwhile, the other two mechanisms, the upward escape of the entrained oceanic asthenospheric material as well as the piling up and thickening of the subducted Pacific slab, may play secondary roles.

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Tao Zhu, Yingxing Guo, Yueyang Xia, and Chao Dong

Status: open (until 31 Dec 2024)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • EC1: 'Comment on egusphere-2024-3219', Juliane Dannberg, 11 Nov 2024 reply
Tao Zhu, Yingxing Guo, Yueyang Xia, and Chao Dong
Tao Zhu, Yingxing Guo, Yueyang Xia, and Chao Dong

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Short summary
Our simulation considers the Mesozoic subduction of the Izanagi slab, which plays an irreplaceable role in the formation of stagnant Pacific slab within the MTZ. The magmas of the Changbaishan volcano may primarily originate from the super-hydrous melts caused by the Pacific slab dehydration in the MTZ. The upward escape of the entrained oceanic asthenospheric material as well as the piling up and thickening of the subducted Pacific slab may play secondary roles.