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Subducted carbon weakens the forearc mantle wedge in a warm subduction zone

Author

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  • Ryosuke Oyanagi

    (Kokushikan University
    Japan Agency for Marine-Earth Science and Technology (JAMSTEC))

  • Atsushi Okamoto

    (Tohoku University)

Abstract

Subducting oceanic plates carry large amounts of carbon into the Earth’s interior. The subducted carbon is mobilized by fluid and encounters ultramafic rocks in the mantle wedge, resulting in changes to the mineral assemblage and mechanical properties of the mantle. Here, we use thermodynamic modeling of interactions between carbon-bearing multi-component fluids and mantle rocks to investigate the down-dip variation in mineral assemblage in the forearc mantle along subduction megathrusts. We found that fluids rich in aqueous carbon are preferentially generated in a warm subduction zone (e.g., Nankai, SW Japan), causing a change in mineral assemblage from serpentine-rich at the mantle wedge corner to talc + carbonate-rich at greater depths. The transition caused by the infiltration of aqueous carbon may influence the depth of the boundary between the seismogenic and aseismic zones, and the down-dip limit of episodic tremor and slip.

Suggested Citation

  • Ryosuke Oyanagi & Atsushi Okamoto, 2024. "Subducted carbon weakens the forearc mantle wedge in a warm subduction zone," Nature Communications, Nature, vol. 15(1), pages 1-9, December.
    • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-51476-6
    DOI: 10.1038/s41467-024-51476-6
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    References listed on IDEAS

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    1. D. M. Kerrick & J. A. D. Connolly, 2001. "Metamorphic devolatilization of subducted marine sediments and the transport of volatiles into the Earth's mantle," Nature, Nature, vol. 411(6835), pages 293-296, May.
    2. David R. Shelly & Gregory C. Beroza & Satoshi Ide, 2007. "Non-volcanic tremor and low-frequency earthquake swarms," Nature, Nature, vol. 446(7133), pages 305-307, March.
    3. Xiang Gao & Kelin Wang, 2017. "Rheological separation of the megathrust seismogenic zone and episodic tremor and slip," Nature, Nature, vol. 543(7645), pages 416-419, March.
    4. P. H. Barry & J. M. Moor & D. Giovannelli & M. Schrenk & D. R. Hummer & T. Lopez & C. A. Pratt & Y. Alpízar Segura & A. Battaglia & P. Beaudry & G. Bini & M. Cascante & G. d’Errico & M. di Carlo & D. , 2019. "Forearc carbon sink reduces long-term volatile recycling into the mantle," Nature, Nature, vol. 568(7753), pages 487-492, April.
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