Seismic imaging of a basaltic Lesser Antilles slab from ancient tectonics

Xusong Yang, Yujiang Xie, Catherine A. Rychert (), Nicholas Harmon, Saskia Goes, Andreas Rietbrock and Lloyd Lynch
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Xusong Yang: Chinese Academy of Sciences
Yujiang Xie: University of Southampton
Catherine A. Rychert: University of Southampton
Nicholas Harmon: University of Southampton
Saskia Goes: Imperial College London
Andreas Rietbrock: Karlsruhe Institute of Technology
Lloyd Lynch: The University of the West Indies

Nature, 2025, vol. 640, issue 8059, 697-701

Abstract: Abstract At subduction zones, lithospheric material descends through the upper mantle to the mantle transition zone (MTZ), where it may continue to sink into the lower mantle or stagnate1,2. Several factors may be important in influencing this flow, including chemical heterogeneity3–5. However, tight constraints on these mantle flows and the exact factors that affect them have proved challenging. We use P-to-S receiver functions to image the subducting slab and the MTZ beneath the Lesser Antilles subduction zone. We image a singular, superdeep (>700 km) 660-km discontinuity over a 200-km-wide zone within the slab, accompanied by nearby double 660 discontinuity phases (normal and superdeep). Combined geodynamic and waveform modelling shows that this observation cannot be explained by temperature effects in typical mantle compositions but requires a large basalt-rich chemical anomaly, strongest in the location of the singular, deep 660. The inferred basalt signature is near the proposed location of a subducted extinct spreading ridge6,7, where basalt is probably present in greater proportions. Our finding suggests that past tectonic events impart chemical heterogeneity into slabs, and the heterogeneities, in turn, may affect the inherent tendency of the slab to sink.

Date: 2025
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DOI: 10.1038/s41586-025-08754-0

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