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

ABSTRACT: 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 coi

SUBMITTER: Gao L 

PROVIDER: S-EPMC11928586 | biostudies-literature | 2025 Mar

REPOSITORIES: biostudies-literature