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Ghost-arc geochemical anomaly at a spreading ridge caused by supersized flat subduction

Author

Listed:
  • Guido M. Gianni

    (Universidad Nacional de San Juan
    National Scientific and Technical Research Council (CONICET))

  • Jeremías Likerman

    (National Scientific and Technical Research Council (CONICET)
    Universidad de Buenos Aires)

  • César R. Navarrete

    (National Scientific and Technical Research Council (CONICET)
    Universidad Nacional de la Patagonia “San Juan Bosco”)

  • Conrado R. Gianni

    (Universidad Nacional de San Juan)

  • Sergio Zlotnik

    (Universitat Politécnica de Catalunya
    Centre Internacional de Métodes Numérics a l’Enginyeria (CIMNE))

Abstract

The Southern Atlantic-Southwest Indian ridges (SASWIR) host mid-ocean ridge basalts with a residual subduction-related geochemical fingerprint (i.e., a ghost-arc signature) of unclear origin. Here, we show through an analysis of plate kinematic reconstructions and seismic tomography models that the SASWIR subduction-modified mantle source formed in the Jurassic close to the Georgia Islands slab (GI) and remained near-stationary in the mantle reference frame. In this analysis, the GI lies far inboard the Jurassic Patagonian-Antarctic Peninsula active margin. This was formerly attributed to a large-scale flat subduction event in the Late Triassic-Early Jurassic. We propose that during this flat slab stage, the subduction-modified mantle areas beneath the Mesozoic active margin and surrounding sutures zones may have been bulldozed inland by >2280 km. After the demise of the flat slab, this mantle anomaly remained near-stationary and was sampled by the Karoo mantle plume 183 Million years (Myr) ago and again since 55 Myr ago by the SASWIR. We refer to this process as asthenospheric anomaly telescoping. This study provides a hitherto unrecognized geodynamic effect of flat subduction, the viability of which we support through numerical modeling.

Suggested Citation

  • Guido M. Gianni & Jeremías Likerman & César R. Navarrete & Conrado R. Gianni & Sergio Zlotnik, 2023. "Ghost-arc geochemical anomaly at a spreading ridge caused by supersized flat subduction," Nature Communications, Nature, vol. 14(1), pages 1-13, December.
    • Handle: RePEc:nat:natcom:v:14:y:2023:i:1:d:10.1038_s41467-023-37799-w
    DOI: 10.1038/s41467-023-37799-w
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    References listed on IDEAS

    as
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