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

Hiroyuki Kagi, Dmitry A. Zedgenizov, Hiroaki Ohfuji, Hidemi Ishibashi

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)834-838
Number of pages5
JournalGeochemistry International
Volume54
Issue number10
DOIs
Publication statusPublished - 1 Oct 2016

Keywords

  • lower mantle
  • micro-inclusion
  • nano-inclusion
  • superdeep diamond

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