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Catastrophic slab loss in southwestern Pangea preserved in the mantle and igneous record

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  • Guido M. Gianni

    (Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET)
    Laboratorio Patagónico de Petro-Tectónica. Universidad Nacional de la Patagonia “San Juan Bosco”, Dpto. de Geología, F.C.N
    Universidad Nacional de San Juan)

  • César R. Navarrete

    (Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET)
    Laboratorio Patagónico de Petro-Tectónica. Universidad Nacional de la Patagonia “San Juan Bosco”, Dpto. de Geología, F.C.N)

Abstract

The Choiyoi Magmatic Province represents a major episode of silicic magmatism in southwestern Pangea in the mid-Permian-Triassic, the origin of which remains intensely debated. Here, we integrate plate-kinematic reconstructions and the lower mantle slab record beneath southwestern Pangea that provide clues on late Paleozoic-Mesozoic subducting slab configurations. Also, we compile geochronological information and analyze geochemical data using tectono-magmatic discrimination diagrams. We demonstrate that this magmatic event resulted from a large-scale slab loss. This is supported by a paleogeographic coincidence between a reconstructed 2,800-3,000-km-wide slab gap and the Choiyoi Magmatic Province and geochemical data indicating a slab break-off fingerprint in the latter. The slab break-off event is compatible with Permian paleogeographic modifications in southwestern Pangea. These findings render the Choiyoi Magmatic Province the oldest example of a geophysically constrained slab loss event and open new avenues to assess the geodynamic setting of silicic large igneous provinces back to the late Paleozoic.

Suggested Citation

  • Guido M. Gianni & César R. Navarrete, 2022. "Catastrophic slab loss in southwestern Pangea preserved in the mantle and igneous record," Nature Communications, Nature, vol. 13(1), pages 1-15, December.
    • Handle: RePEc:nat:natcom:v:13:y:2022:i:1:d:10.1038_s41467-022-28290-z
    DOI: 10.1038/s41467-022-28290-z
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    References listed on IDEAS

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    Cited by:

    1. 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.

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