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Subduction-related oxidation of the sublithospheric mantle evidenced by ferropericlase and magnesiowüstite diamond inclusions

Author

Listed:
  • Ekaterina S. Kiseeva

    (University College Cork)

  • Nester Korolev

    (Institute of Precambrian Geology and Geochronology of the Russian Academy of Sciences)

  • Iuliia Koemets

    (Universität Bayreuth)

  • Dmitry A. Zedgenizov

    (A.N. Zavaritsky Institute of Geology and Geochemistry
    Ural State Mining University)

  • Richard Unitt

    (University College Cork)

  • Catherine McCammon

    (Universität Bayreuth)

  • Alena Aslandukova

    (Universität Bayreuth)

  • Saiana Khandarkhaeva

    (Universität Bayreuth)

  • Timofey Fedotenko

    (Universität Bayreuth
    Deutsches Elektronen-Synchrotron DESY)

  • Konstantin Glazyrin

    (Deutsches Elektronen-Synchrotron DESY)

  • Dimitrios Bessas

    (ESRF-The European Synchrotron, CS 40220)

  • Georgios Aprilis

    (ESRF-The European Synchrotron, CS 40220)

  • Alexandr I. Chumakov

    (ESRF-The European Synchrotron, CS 40220)

  • Hiroyuki Kagi

    (The University of Tokyo)

  • Leonid Dubrovinsky

    (Universität Bayreuth)

Abstract

Ferropericlase (Mg,Fe)O is the second most abundant mineral in Earth’s lower mantle and a common inclusion found in subcratonic diamonds. Pyrolitic mantle has Mg# (100 × Mg/(Mg+Fe)) ~89. However, ferropericlase inclusions in diamonds show a broad range of Mg# between 12 and 93. Here we use Synchrotron Mössbauer Source (SMS) spectroscopy and single-crystal X-ray diffraction to determine the iron oxidation state and structure of two magnesiowüstite and three ferropericlase inclusions in diamonds from São Luiz, Brazil. Inclusion Mg#s vary between 16.1 and 84.5. Ferropericlase inclusions contain no ferric iron within the detection limit of SMS, while both magnesiowüstite inclusions show the presence of monocrystalline magnesioferrite ((Mg,Fe)Fe3+2O4) with an estimated 47–53 wt% Fe2O3. We argue that the wide range of Fe concentrations observed in (Mg,Fe)O inclusions in diamonds and the appearance of magnesioferrite result from oxidation of ferropericlase triggered by the introduction of subducted material into sublithospheric mantle.

Suggested Citation

  • Ekaterina S. Kiseeva & Nester Korolev & Iuliia Koemets & Dmitry A. Zedgenizov & Richard Unitt & Catherine McCammon & Alena Aslandukova & Saiana Khandarkhaeva & Timofey Fedotenko & Konstantin Glazyrin , 2022. "Subduction-related oxidation of the sublithospheric mantle evidenced by ferropericlase and magnesiowüstite diamond inclusions," Nature Communications, Nature, vol. 13(1), pages 1-8, December.
    • Handle: RePEc:nat:natcom:v:13:y:2022:i:1:d:10.1038_s41467-022-35110-x
    DOI: 10.1038/s41467-022-35110-x
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    References listed on IDEAS

    as
    1. Arno Rohrbach & Chris Ballhaus & Ute Golla–Schindler & Peter Ulmer & Vadim S. Kamenetsky & Dmitry V. Kuzmin, 2007. "Metal saturation in the upper mantle," Nature, Nature, vol. 449(7161), pages 456-458, September.
    2. M. E. Regier & D. G. Pearson & T. Stachel & R. W. Luth & R. A. Stern & J. W. Harris, 2020. "The lithospheric-to-lower-mantle carbon cycle recorded in superdeep diamonds," Nature, Nature, vol. 585(7824), pages 234-238, September.
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