Mineralogical and crystallographic features of polycrystalline yakutite diamond

Hiroaki Ohfuji, Motosuke Nakaya, Alexander P. Yelisseyev, Valentin P. Afanasiev, Konstantin D. Litasov

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)

Abstract

This study revealed for the first time the microtexture and crystallographic features of natural polycrystalline diamond, yakutite found in placer deposits in the Siberian Platform, Russia. Yakutite consists of well-sintered nanocrystalline (5-50 nm) diamond and small amount of lonsdaleite showing distinct preferred orientations. Micro-focus X-ray and electron diffractions showed a coaxial relationship between lonsdaleite 100 and diamond 111, suggesting the martensitic formation of yakutite from crystalline graphite. These textural and crystallographic features are well comparable to those of the impact diamonds from the Popigai crater located in the central Siberia and strongly support the idea that yakutite is a product of long-distance outburst from the Popigai crater, which has been inferred merely from the geochemical signatures.

Original languageEnglish
Pages (from-to)46-51
Number of pages6
JournalJournal of Mineralogical and Petrological Sciences
Volume112
Issue number1
DOIs
Publication statusPublished - Feb 2017

Keywords

  • Impact diamond
  • Microtexture
  • Nanocrystalline diamond
  • TEM
  • Yakutite
  • TRANSFORMATION
  • LONSDALEITE
  • ORIGIN
  • DIRECT CONVERSION
  • GRAPHITE

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