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Molecular hydrogen in minerals as a clue to interpret ∂D variations in the mantle

Author

Listed:
  • B. N. Moine

    (Université de Lyon, UJM-Saint-Etienne, UCA, IRD, CNRS, Laboratoire Magmas et Volcans, UMR6524)

  • N. Bolfan-Casanova

    (Université Clermont-Auvergne, CNRS UMR 6524)

  • I. B. Radu

    (Université de Lyon, UJM-Saint-Etienne, UCA, IRD, CNRS, Laboratoire Magmas et Volcans, UMR6524
    University of Cape Town)

  • D. A. Ionov

    (Université de Montpellier)

  • G. Costin

    (Rice University)

  • A. V. Korsakov

    (Siberian Branch Russian Academy of Sciences (SB RAS))

  • A. V. Golovin

    (Siberian Branch Russian Academy of Sciences (SB RAS)
    Novosibirsk State University)

  • O. B. Oleinikov

    (Diamond and Precious Metal Geology Institute, SB RAS)

  • E. Deloule

    (CRPG, UMR7358, CNRS, Université de Lorraine)

  • J. Y. Cottin

    (Université de Lyon, UJM-Saint-Etienne, UCA, IRD, CNRS, Laboratoire Magmas et Volcans, UMR6524)

Abstract

Trace amounts of water dissolved in minerals affect density, viscosity and melting behaviour of the Earth’s mantle and play an important role in global tectonics, magmatism and volatile cycle. Water concentrations and the ratios of hydrogen isotopes in the mantle give insight into these processes, as well as into the origin of terrestrial water. Here we show the presence of molecular H2 in minerals (omphacites) from eclogites from the Kaapvaal and Siberian cratons. These omphacites contain both high amounts of H2 (70 to 460 wt. ppm) and OH. Furthermore, their ∂D values increase with dehydration, suggesting a positive H isotope fractionation factor between minerals and H2–bearing fluid, contrary to what is expected in case of isotopic exchange between minerals and H2O-fluids. The possibility of incorporation of large quantities of H as H2 in nominally anhydrous minerals implies that the storage capacity of H in the mantle may have been underestimated, and sheds new light on H isotope variations in mantle magmas and minerals.

Suggested Citation

  • B. N. Moine & N. Bolfan-Casanova & I. B. Radu & D. A. Ionov & G. Costin & A. V. Korsakov & A. V. Golovin & O. B. Oleinikov & E. Deloule & J. Y. Cottin, 2020. "Molecular hydrogen in minerals as a clue to interpret ∂D variations in the mantle," Nature Communications, Nature, vol. 11(1), pages 1-10, December.
    • Handle: RePEc:nat:natcom:v:11:y:2020:i:1:d:10.1038_s41467-020-17442-8
    DOI: 10.1038/s41467-020-17442-8
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    Cited by:

    1. Yunhua Fu & Renbiao Tao & Lifei Zhang & Shijie Li & Ya-Nan Yang & Dehan Shen & Zilong Wang & Thomas Meier, 2024. "Trace element detection in anhydrous minerals by micro-scale quantitative nuclear magnetic resonance spectroscopy," Nature Communications, Nature, vol. 15(1), pages 1-10, December.

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