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Redox-freezing and nucleation of diamond via magnetite formation in the Earth’s mantle

Author

Listed:
  • Dorrit E. Jacob

    (Macquarie University)

  • Sandra Piazolo

    (Macquarie University)

  • Anja Schreiber

    (GeoForschungsZentrum Potsdam)

  • Patrick Trimby

    (Australian Centre for Microscopy and Microanalysis, The University of Sydney)

Abstract

Diamonds and their inclusions are unique probes into the deep Earth, tracking the deep carbon cycle to >800 km. Understanding the mechanisms of carbon mobilization and freezing is a prerequisite for quantifying the fluxes of carbon in the deep Earth. Here we show direct evidence for the formation of diamond by redox reactions involving FeNi sulfides. Transmission Kikuchi Diffraction identifies an arrested redox reaction from pyrrhotite to magnetite included in diamond. The magnetite corona shows coherent epitaxy with relict pyrrhotite and diamond, indicating that diamond nucleated on magnetite. Furthermore, structures inherited from h-Fe3O4 define a phase transformation at depths of 320–330 km, the base of the Kaapvaal lithosphere. The oxidation of pyrrhotite to magnetite is an important trigger of diamond precipitation in the upper mantle, explaining the presence of these phases in diamonds.

Suggested Citation

  • Dorrit E. Jacob & Sandra Piazolo & Anja Schreiber & Patrick Trimby, 2016. "Redox-freezing and nucleation of diamond via magnetite formation in the Earth’s mantle," Nature Communications, Nature, vol. 7(1), pages 1-7, September.
    • Handle: RePEc:nat:natcom:v:7:y:2016:i:1:d:10.1038_ncomms11891
    DOI: 10.1038/ncomms11891
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    Cited by:

    1. 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.

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