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<p>Intraplate volcanism in the Changbaishan region of northeast China is underlain by a deep subduction-related earthquake cluster in the mantle transition zone, but the underlying physical connections between them remain elusive. Here we use teleseismic double-difference tomography to obtain high-resolution images of the subducting Pacific slab to provide better constraints on slab morphology and potential relationships with volcanism and deep-focus seismicity. Our results reveal a narrow slab tongue penetrating the lower mantle, flanked to the north and south by slab stagnating in the mantle transition zone. This geometry creates a gap for sub-slab hot materials to ascend, providing a deep mantle source for Changbaishan volcanism. Additionally, the slab tongue is warped, which spatially coincides with a cluster of deep earthquakes, implying that an active deformation zone causes the clustered deep earthquakes. Our findings demonstrate that Changbaishan volcanism and deep-focus earthquakes are fundamentally controlled by the subducting slab’s dynamic morphology beneath northeast China.</p>

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Local slab penetration into lower mantle controls deep-focus seismicity and Changbaishan volcanism in northeast China

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年3月21日

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  • Lei Gao,
  • Haijiang Zhang,
  • Robert Myhill,
  • Ji Gao,
  • Wei Leng

摘要

Intraplate volcanism in the Changbaishan region of northeast China is underlain by a deep subduction-related earthquake cluster in the mantle transition zone, but the underlying physical connections between them remain elusive. Here we use teleseismic double-difference tomography to obtain high-resolution images of the subducting Pacific slab to provide better constraints on slab morphology and potential relationships with volcanism and deep-focus seismicity. Our results reveal a narrow slab tongue penetrating the lower mantle, flanked to the north and south by slab stagnating in the mantle transition zone. This geometry creates a gap for sub-slab hot materials to ascend, providing a deep mantle source for Changbaishan volcanism. Additionally, the slab tongue is warped, which spatially coincides with a cluster of deep earthquakes, implying that an active deformation zone causes the clustered deep earthquakes. Our findings demonstrate that Changbaishan volcanism and deep-focus earthquakes are fundamentally controlled by the subducting slab’s dynamic morphology beneath northeast China.