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<p>Slab gaps in subducted plates are widely hypothesized to channel hot mantle upwellings, yet their formation and thermal state remain enigmatic. Here we image a continuous ~1000 km-long arcuate slab gap in the mantle transition zone beneath Northeast Asia with no evidence of anomalous heat. By integrating dense-array teleseismic tomography, 3-D waveform modeling, and a joint inversion of seismic velocities with transition-zone thickness, we constrain the fine-scale geometry and thermal structure of the gap. Sharp lateral boundaries are consistent with a mechanical opening within the stagnant slab, and gap temperatures are comparable to ambient upper‑mantle values and &gt;200 °C lower than plume‑like temperatures. The planform of the gap aligns with the path of a migrating triple junction, suggesting formation through progressive slab tearing during plate-boundary reorganization. These observations demonstrate that a slab gap can persist without hot upwelling, consistent with the diffuse intraplate volcanism above the region.</p>

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Continuous nonthermal slab gap formed by progressive tearing beneath Northeast Asia

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年7月2日

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  • Jung-Hun Song,
  • Seongryong Kim,
  • Benoît Tauzin,
  • Junkee Rhie

摘要

Slab gaps in subducted plates are widely hypothesized to channel hot mantle upwellings, yet their formation and thermal state remain enigmatic. Here we image a continuous ~1000 km-long arcuate slab gap in the mantle transition zone beneath Northeast Asia with no evidence of anomalous heat. By integrating dense-array teleseismic tomography, 3-D waveform modeling, and a joint inversion of seismic velocities with transition-zone thickness, we constrain the fine-scale geometry and thermal structure of the gap. Sharp lateral boundaries are consistent with a mechanical opening within the stagnant slab, and gap temperatures are comparable to ambient upper‑mantle values and >200 °C lower than plume‑like temperatures. The planform of the gap aligns with the path of a migrating triple junction, suggesting formation through progressive slab tearing during plate-boundary reorganization. These observations demonstrate that a slab gap can persist without hot upwelling, consistent with the diffuse intraplate volcanism above the region.