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@ARTICLE{Kiseeva:418155,
      author       = {Kiseeva, Ekaterina S. and Vasiukov, Denis M. and Wood,
                      Bernard J. and McCammon, Catherine and Stachel, Thomas and
                      Bykov, Maxim and Bykova, Elena and Chumakov, Aleksandr and
                      Cerantola, Valerio and Harris, Jeff W. and Dubrovinsky,
                      Leonid},
      title        = {{O}xidized iron in garnets from the mantle transition zone},
      journal      = {Nature geoscience},
      volume       = {11},
      number       = {2},
      issn         = {1752-0908},
      address      = {London},
      publisher    = {Nature Publ. Group},
      reportid     = {PUBDB-2019-00242},
      pages        = {144 - 147},
      year         = {2018},
      note         = {© Macmillan Publishers Limited, part of Springer Nature.},
      abstract     = {The oxidation state of iron in Earth’s mantle is well
                      known to depths of approximately 200 km, but has not been
                      characterized in samples from the lowermost upper mantle
                      (200–410 km depth) or the transition zone
                      (410–660 km depth). Natural samples from the deep
                      (>200 km) mantle are extremely rare, and are usually only
                      found as inclusions in diamonds. Here we use synchrotron
                      Mössbauer source spectroscopy complemented by
                      single-crystal X-ray diffraction to measure the oxidation
                      state of Fe in inclusions of ultra-high pressure majoritic
                      garnet in diamond. The garnets show a pronounced increase in
                      oxidation state with depth, with Fe$^{3+}$/(Fe$^{3+}$+
                      Fe$^{2+}$) increasing from 0.08 at approximately 240 km
                      depth to 0.30 at approximately 500 km depth. The latter
                      majorites, which come from pyroxenitic bulk compositions,
                      are twice as rich in Fe$^{3+}$ as the most oxidized garnets
                      from the shallow mantle. Corresponding oxygen fugacities are
                      above the upper stability limit of Fe metal. This implies
                      that the increase in oxidation state is unconnected to
                      disproportionation of Fe$^{2+}$ to Fe$^{3+}$ plus Fe$^0$.
                      Instead, the Fe$^{3+}$ increase with depth is consistent
                      with the hypothesis that carbonated fluids or melts are the
                      oxidizing agents responsible for the high Fe$^{3+}$ contents
                      of the inclusions.},
      cin          = {DOOR / FS-PE},
      ddc          = {550},
      cid          = {I:(DE-H253)HAS-User-20120731 / I:(DE-H253)FS-PE-20120731},
      pnm          = {6211 - Extreme States of Matter: From Cold Ions to Hot
                      Plasmas (POF3-621) / 6G3 - PETRA III (POF3-622)},
      pid          = {G:(DE-HGF)POF3-6211 / G:(DE-HGF)POF3-6G3},
      experiment   = {EXP:(DE-H253)P-P02.2-20150101},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000423843600014},
      doi          = {10.1038/s41561-017-0055-7},
      url          = {https://bib-pubdb1.desy.de/record/418155},
}