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Boninite-like intraplate magmas from Manihiki Plateau require ultra-depleted and enriched source components

Author

Listed:
  • Roman Golowin

    (GEOMAR Helmholtz Centre for Ocean Research Kiel)

  • Maxim Portnyagin

    (GEOMAR Helmholtz Centre for Ocean Research Kiel
    V.I.Vernadsky Institute of Geochemistry and Analytical Chemistry)

  • Kaj Hoernle

    (GEOMAR Helmholtz Centre for Ocean Research Kiel
    Christian-Albrechts-University of Kiel)

  • Folkmar Hauff

    (GEOMAR Helmholtz Centre for Ocean Research Kiel)

  • Andrey Gurenko

    (Centre de Recherches Pétrographiques et Géochimiques, UMR 7358, Université de Lorraine)

  • Dieter Garbe-Schönberg

    (Christian-Albrechts-University of Kiel)

  • Reinhard Werner

    (GEOMAR Helmholtz Centre for Ocean Research Kiel)

  • Simon Turner

    (Macquarie University)

Abstract

The Ontong Java and Manihiki oceanic plateaus are believed to have formed through high-degree melting of a mantle plume head. Boninite-like, low-Ti basement rocks at Manihiki, however, imply a more complex magma genesis compared with Ontong Java basement lavas that can be generated by ∼30% melting of a primitive mantle source. Here we show that the trace element and isotope compositions of low-Ti Manihiki rocks can best be explained by re-melting of an ultra-depleted source (possibly a common mantle component in the Ontong Java and Manihiki plume sources) re-enriched by ≤1% of an ocean-island-basalt-like melt component. Unlike boninites formed via hydrous flux melting of refractory mantle at subduction zones, these boninite-like intraplate rocks formed through adiabatic decompression melting of refractory plume material that has been metasomatized by ocean-island-basalt-like melts. Our results suggest that caution is required before assuming all Archaean boninites were formed in association with subduction processes.

Suggested Citation

  • Roman Golowin & Maxim Portnyagin & Kaj Hoernle & Folkmar Hauff & Andrey Gurenko & Dieter Garbe-Schönberg & Reinhard Werner & Simon Turner, 2017. "Boninite-like intraplate magmas from Manihiki Plateau require ultra-depleted and enriched source components," Nature Communications, Nature, vol. 8(1), pages 1-10, April.
    • Handle: RePEc:nat:natcom:v:8:y:2017:i:1:d:10.1038_ncomms14322
    DOI: 10.1038/ncomms14322
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