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

Xin Wang, Ling Chen (), Kelin Wang, Qi-Fu Chen, Zhongwen Zhan and Jianfeng Yang
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Xin Wang: Chinese Academy of Sciences
Ling Chen: University of Chinese Academy of Sciences
Kelin Wang: Geological Survey of Canada
Qi-Fu Chen: Chinese Academy of Sciences
Zhongwen Zhan: California Institute of Technology
Jianfeng Yang: University of Chinese Academy of Sciences

Nature Communications, 2024, vol. 15, issue 1, 1-10

Abstract: 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 (

Date: 2024
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DOI: 10.1038/s41467-024-47887-0

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