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Boron isotopes in boninites document rapid changes in slab inputs during subduction initiation

Author

Listed:
  • Hong-Yan Li

    (Chinese Academy of Sciences
    CAS Center for Excellence in Deep Earth Science
    Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou))

  • Xiang Li

    (Chinese Academy of Sciences
    University of Chinese Academy of Sciences)

  • Jeffrey G. Ryan

    (University of South Florida)

  • Chao Zhang

    (Northwest University)

  • Yi-Gang Xu

    (Chinese Academy of Sciences
    CAS Center for Excellence in Deep Earth Science
    Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou))

Abstract

How subduction-related magmatism starts at convergent plate margins is still poorly understood. Here we show that boron isotope variations in early-formed boninites from the Izu-Bonin arc, combined with radiogenic isotopes and elemental ratios document rapid (~0.5 to 1 Myr) changes in the sources and makeup of slab inputs as subduction begins. Heterogeneous hornblende-granulite facies melts from ocean crust gabbros ± basalts fluxed early melting to generate low silica boninites. Hydrous fluids from slab sediments and basalts later fluxed the low silica boninites mantle source to produce high silica boninites. Our results suggest that initially the uppermost parts of the slab were accreted near the nascent trench, perhaps related to early low-angle subduction. The rapid changes in slab inputs recorded in the boninites entail a steepening subduction angle and cooling of the plate interface, allowing for subduction of slab sediment and basalt, and generating hydrous fluids at lower slab temperatures.

Suggested Citation

  • Hong-Yan Li & Xiang Li & Jeffrey G. Ryan & Chao Zhang & Yi-Gang Xu, 2022. "Boron isotopes in boninites document rapid changes in slab inputs during subduction initiation," Nature Communications, Nature, vol. 13(1), pages 1-10, December.
    • Handle: RePEc:nat:natcom:v:13:y:2022:i:1:d:10.1038_s41467-022-28637-6
    DOI: 10.1038/s41467-022-28637-6
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    References listed on IDEAS

    as
    1. Hong-Yan Li & Rui-Peng Zhao & Jie Li & Yoshihiko Tamura & Christopher Spencer & Robert J. Stern & Jeffrey G. Ryan & Yi-Gang Xu, 2021. "Molybdenum isotopes unmask slab dehydration and melting beneath the Mariana arc," Nature Communications, Nature, vol. 12(1), pages 1-10, December.
    2. George F. Cooper & Colin G. Macpherson & Jon D. Blundy & Benjamin Maunder & Robert W. Allen & Saskia Goes & Jenny S Collier & Lidong Bie & Nicholas Harmon & Stephen P. Hicks & Alexander A. Iveson & Ju, 2020. "Variable water input controls evolution of the Lesser Antilles volcanic arc," Nature, Nature, vol. 582(7813), pages 525-529, June.
    3. Chen Cai & Douglas A. Wiens & Weisen Shen & Melody Eimer, 2018. "Water input into the Mariana subduction zone estimated from ocean-bottom seismic data," Nature, Nature, vol. 563(7731), pages 389-392, November.
    4. Xin Zhou & Ikuko Wada, 2021. "Differentiating induced versus spontaneous subduction initiation using thermomechanical models and metamorphic soles," Nature Communications, Nature, vol. 12(1), pages 1-10, December.
    5. Ronit Kessel & Max W. Schmidt & Peter Ulmer & Thomas Pettke, 2005. "Trace element signature of subduction-zone fluids, melts and supercritical liquids at 120–180 km depth," Nature, Nature, vol. 437(7059), pages 724-727, September.
    6. George F. Cooper & Colin G. Macpherson & Jon D. Blundy & Benjamin Maunder & Robert W. Allen & Saskia Goes & Jenny S. Collier & Lidong Bie & Nicholas Harmon & Stephen P. Hicks & Alexander A. Iveson & J, 2020. "Author Correction: Variable water input controls evolution of the Lesser Antilles volcanic arc," Nature, Nature, vol. 584(7822), pages 36-36, August.
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