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Basalt derived from highly refractory mantle sources during early Izu-Bonin-Mariana arc development

Author

Listed:
  • He Li

    (Chinese Academy of Sciences
    Laboratory for Marine Mineral Resources, Qingdao National Laboratory for Marine Science and Technology
    Chinese Academy of Sciences
    Australian National University)

  • Richard J. Arculus

    (Australian National University)

  • Osamu Ishizuka

    (Geological Survey of Japan/AIST
    Japan Agency for Marine-Earth Science and Technology)

  • Rosemary Hickey-Vargas

    (Florida International University)

  • Gene M. Yogodzinski

    (University of South Carolina)

  • Anders McCarthy

    (University of Lausanne
    CY Cergy Paris Université)

  • Yuki Kusano

    (Geological Survey of Japan/AIST)

  • Philipp A. Brandl

    (Australian National University
    GEOMAR Helmholtz Centre for Ocean Research Kiel)

  • Ivan P. Savov

    (University of Leeds)

  • Frank J. Tepley

    (Oregon State University)

  • Weidong Sun

    (Chinese Academy of Sciences
    Laboratory for Marine Mineral Resources, Qingdao National Laboratory for Marine Science and Technology
    Chinese Academy of Sciences)

Abstract

The magmatic character of early subduction zone and arc development is unlike mature systems. Low-Ti-K tholeiitic basalts and boninites dominate the early Izu-Bonin-Mariana (IBM) system. Basalts recovered from the Amami Sankaku Basin (ASB), underlying and located west of the IBM’s oldest remnant arc, erupted at ~49 Ma. This was 3 million years after subduction inception (51-52 Ma) represented by forearc basalt (FAB), at the tipping point between FAB-boninite and typical arc magmatism. We show ASB basalts are low-Ti-K, aluminous spinel-bearing tholeiites, distinct compared to mid-ocean ridge (MOR), backarc basin, island arc or ocean island basalts. Their upper mantle source was hot, reduced, refractory peridotite, indicating prior melt extraction. ASB basalts transferred rapidly from pressures (~0.7-2 GPa) at the plagioclase-spinel peridotite facies boundary to the surface. Vestiges of a polybaric-polythermal mineralogy are preserved in this basalt, and were not obliterated during persistent recharge-mix-tap-fractionate regimes typical of MOR or mature arcs.

Suggested Citation

  • He Li & Richard J. Arculus & Osamu Ishizuka & Rosemary Hickey-Vargas & Gene M. Yogodzinski & Anders McCarthy & Yuki Kusano & Philipp A. Brandl & Ivan P. Savov & Frank J. Tepley & Weidong Sun, 2021. "Basalt derived from highly refractory mantle sources during early Izu-Bonin-Mariana arc development," Nature Communications, Nature, vol. 12(1), pages 1-10, December.
    • Handle: RePEc:nat:natcom:v:12:y:2021:i:1:d:10.1038_s41467-021-21980-0
    DOI: 10.1038/s41467-021-21980-0
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