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Geochemistry International

, Volume 54, Issue 10, pp 834–838 | Cite as

Micro- and nano-inclusions in a superdeep diamond from São Luiz, Brazil

  • Hiroyuki KagiEmail author
  • Dmitry A. Zedgenizov
  • Hiroaki Ohfuji
  • Hidemi Ishibashi
Article

Abstract

We report cloudy micro- and nano-inclusions in a superdeep diamond from São-Luiz, Brazil which contains inclusions of ferropericlase (Mg, Fe)O and former bridgmanite (Mg, Fe)SiO3 and ringwoodite (Mg, Fe)2SiO4. Field emission-SEM and TEM observations showed that the cloudy inclusions were composed of euhedral micro-inclusions with grain sizes ranging from tens nanometers to submicrometers. Infrared absorption spectra of the cloudy inclusions showed that water, carbonate, and silicates were not major components of these micro- and nano-inclusions and suggested that the main constituent of the inclusions was infrared-inactive. Some inclusions were suggested to contain material with lower atomic numbers than that of carbon. Mineral phase of nano- and micro-inclusions is unclear at present. Microbeam X-ray fluorescence analysis clarified that the micro-inclusions contained transition metals (Cr, Mn, Fe, Co, Ni, Cu, Zn) possibly as metallic or sulfide phases. The cloudy inclusions provide an important information on the growth environment of superdeep diamonds in the transition zone or the lower mantle.

Keywords

superdeep diamond micro-inclusion nano-inclusion lower mantle 

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Copyright information

© Pleiades Publishing, Ltd. 2016

Authors and Affiliations

  • Hiroyuki Kagi
    • 1
    Email author
  • Dmitry A. Zedgenizov
    • 2
    • 3
  • Hiroaki Ohfuji
    • 4
  • Hidemi Ishibashi
    • 5
  1. 1.Geochemical Research Center, Graduate School of ScienceThe University of TokyoTokyoJapan
  2. 2.V.S. Sobolev Institute of Geology and MineralogyRussian Academy of Science, Siberian BranchNovosibirskRussia
  3. 3.Novosibirsk State UniversityNovosibirskRussia
  4. 4.Geodynamics Research CenterEhime UniversityEhimeJapan
  5. 5.Department of Earth Science, Faculty of ScienceShizuoka UniversityShizuokaJapan

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