Graphite in rocks of the popigai impact crater: Residual or retrograde?

Valentin Afanasiev, Sergey Gromilov, Valeri Sonin, Egor Zhimulev, Aleksei Chepurov

Research output: Contribution to journalArticlepeer-review

Abstract

The concentration of diamond-bearing tagamite from the Popigai impact crater produces large amounts of graphite in addition to impact diamonds (1:100, respectively). The question arises of whether this is residual graphite not converted to diamond at the time of the Popigai impact or is a retrograde form resulting from back-conversion of impact diamond to graphite in a high-temperature tagamite melt. Experiments show that graphite from tagamite is a residual phase. Coexistence of lonsdaleite, cubic diamond, and single-crystal graphite within a limited volume may be due to different orientations of the graphite base plane relative to the impact stress direction. Thus, the diamond-bearing rocks may contain significant amounts of residual graphite, which is consistent with published evidence.

Original languageEnglish
Pages (from-to)470-477
Number of pages8
JournalTurkish Journal of Earth Sciences
Volume28
Issue number3
DOIs
Publication statusPublished - 1 Jan 2019

Keywords

  • Bulk graphitization
  • Graphite
  • Impact crater
  • Impact diamond
  • Surface graphitization

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