Specific multiphase assemblages of carbonatitic and al-rich silicic diamond-forming fluids/melts: TEM observation of microinclusions in cuboid diamonds from the placers of Northeastern Siberian craton

Alla Logvinova, Dmitry Zedgenizov, Richard Wirth

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)

Abstract

The microinclusions in cuboid diamonds from Ebelyakh River deposits (northeastern Siberian craton) have been investigated by FIB/TEM techniques. It was found that these microinclusions have multiphase associations, containing silicates, oxides, carbonates, halides, sulfides, graphite, and fluid phases. The bulk chemical composition of the microinclusions indicates two contrasting growth media: Mg-rich carbonatitic and Al-rich silicic. Each media has their own specific set of daughter phases. Carbonatitic microinclusions are characterized by the presence of dolomite, phlogopite, apatite, Mg, Fe-oxide, KCl, rutile, magnetite, Fe-sulfides, and hydrous fluid phases. Silicic microinclusions are composed mainly of free SiO 2 phase (quartz), high-Si mica (phengite), Al-silicate (paragonite), F-apatite, Ca-carbonates enriched with Sr and Ba, Fe-sulfides, and hydrous fluid phases. These associations resulted from the cooling of diamond-forming carbonatitic and silicic fluids/melts preserved in microinclusions in cuboid diamonds during their ascent to the surface. The observed compositional variations indicate different origins and evolutions of these fluids/melts.

Original languageEnglish
Article number50
Number of pages11
JournalMinerals
Volume9
Issue number1
DOIs
Publication statusPublished - 1 Jan 2019

Keywords

  • Cuboid diamonds
  • Diamond-forming fluids/melts
  • Mantle
  • Microinclusions
  • CRYSTALLIZATION
  • HIGH-PRESSURE
  • microinclusions
  • ION-BEAM FIB
  • MANTLE FLUIDS
  • cuboid diamonds
  • FLUID INCLUSIONS
  • MINERAL INCLUSIONS
  • TRACE-ELEMENTS
  • PHASE
  • EVOLUTION
  • mantle
  • FIBROUS DIAMONDS
  • diamond-forming fluids/melts

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