Microrelief of rounded diamond crystals as an indicator of the redox conditions of their resorption in a kimberlite melt

Alexander F. Khokhryakov, Denis V. Nechaev, Alexander G. Sokol

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

We conducted a detailed study of the morphology of diamond crystals partially dissolved in a water-bearing kimberlite melt at pressure of 6.3 GPa, temperature of 1400C, and two oxygen fugacities (fO2) corresponding to the Re-ReO2 buffer and near the magnetite–hematite (MH) buffer. The triangular etch pits on the {111} faces, which formed during experimental diamond dissolution, were found to completely correspond to negative trigons on natural diamond crystals in the shape and sidewalls inclination angle. Furthermore, two experimental fO2 values were associated with two relief types of the rounded tetrahexahedroid surfaces typical of natural rounded diamonds. Therefore, the surface microrelief on rounded natural diamond crystals was concluded to be an indicator of the redox conditions of natural diamond resorption.

Original languageEnglish
Article number233
Number of pages12
JournalCrystals
Volume10
Issue number3
DOIs
Publication statusPublished - 23 Mar 2020

Keywords

  • Crystal morphology
  • Diamond
  • High-pressure
  • High-temperature
  • Kimberlite melt
  • Resorption
  • CRYSTALLIZATION
  • OXIDATION
  • SURFACE-FEATURES
  • DISLOCATIONS
  • DISSOLUTION FORMS
  • crystal morphology
  • kimberlite melt
  • PRESSURE
  • diamond
  • EVOLUTION
  • high-pressure
  • high-temperature
  • resorption
  • FLUID COMPOSITION
  • MORPHOLOGY
  • ETCH PITS

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