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

Ekaterina S. Kiseeva (), Nester Korolev, Iuliia Koemets, Dmitry A. Zedgenizov, Richard Unitt, Catherine McCammon, Alena Aslandukova, Saiana Khandarkhaeva, Timofey Fedotenko, Konstantin Glazyrin, Dimitrios Bessas, Georgios Aprilis, Alexandr I. Chumakov, Hiroyuki Kagi and Leonid Dubrovinsky
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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
Richard Unitt: University College Cork
Catherine McCammon: Universität Bayreuth
Alena Aslandukova: Universität Bayreuth
Saiana Khandarkhaeva: Universität Bayreuth
Timofey Fedotenko: Universität Bayreuth
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

Nature Communications, 2022, vol. 13, issue 1, 1-8

Abstract: 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.

Date: 2022
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DOI: 10.1038/s41467-022-35110-x

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