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Seismic evidence for melt-rich lithosphere-asthenosphere boundary beneath young slab at Cascadia

Author

Listed:
  • Xin Wang

    (Chinese Academy of Sciences
    University of Chinese Academy of Sciences
    California Institute of Technology)

  • Ling Chen

    (University of Chinese Academy of Sciences
    Chinese Academy of Sciences)

  • Kelin Wang

    (Geological Survey of Canada)

  • Qi-Fu Chen

    (Chinese Academy of Sciences
    University of Chinese Academy of Sciences)

  • Zhongwen Zhan

    (California Institute of Technology)

  • Jianfeng Yang

    (University of Chinese Academy of Sciences
    Chinese Academy of Sciences)

Abstract

The Lithosphere-Asthenosphere Boundary (LAB) beneath oceanic plates is generally imaged as a sharp seismic velocity reduction, suggesting the presence of partial melts. However, the fate of a melt-rich LAB is unclear after these plates descend into the mantle at subduction zones. Recent geophysical studies suggest its persistence with down-going old and cold slabs, but whether or not it is commonly present remains unclear, especially for young and warm slabs such as in the Cascadia subduction zone. Here we provide evidence for its presence at Cascadia in the form of a large (9.8 $$\pm$$ ± 1.5 $$\%$$ % ) decrease in shear-wave velocity over a very small (

Suggested Citation

  • Xin Wang & Ling Chen & Kelin Wang & Qi-Fu Chen & Zhongwen Zhan & Jianfeng Yang, 2024. "Seismic evidence for melt-rich lithosphere-asthenosphere boundary beneath young slab at Cascadia," Nature Communications, Nature, vol. 15(1), pages 1-10, December.
    • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-47887-0
    DOI: 10.1038/s41467-024-47887-0
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    References listed on IDEAS

    as
    1. Pascal Audet & Michael G. Bostock & Nikolas I. Christensen & Simon M. Peacock, 2009. "Seismic evidence for overpressured subducted oceanic crust and megathrust fault sealing," Nature, Nature, vol. 457(7225), pages 76-78, January.
    2. Eric Debayle & Thomas Bodin & Stéphanie Durand & Yanick Ricard, 2020. "Seismic evidence for partial melt below tectonic plates," Nature, Nature, vol. 586(7830), pages 555-559, October.
    3. S. Naif & K. Key & S. Constable & R. L. Evans, 2013. "Melt-rich channel observed at the lithosphere–asthenosphere boundary," Nature, Nature, vol. 495(7441), pages 356-359, March.
    4. M. G. Bostock & R. D. Hyndman & S. Rondenay & S. M. Peacock, 2002. "An inverted continental Moho and serpentinization of the forearc mantle," Nature, Nature, vol. 417(6888), pages 536-538, May.
    5. Kelin Wang & Yan Hu & Jiangheng He, 2012. "Deformation cycles of subduction earthquakes in a viscoelastic Earth," Nature, Nature, vol. 484(7394), pages 327-332, April.
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