2 Citations (Scopus)

Abstract

The paper presents new data on the internal structure of super-deep (sublithospheric) diamonds from Saõ-Luiz river placers (Brazil) and from alluvial placers of the northeastern Siberian platform (Yakutia). The sublithospheric origin of these diamonds is supported by the presence of mineral inclusions corresponding to associations of the transition zone and lower mantle. The features of morphology and internal structure have been studied by optical and scanning electron microscopy (SEM), cathodoluminescence topography (CL), and electron backscatter diffraction (EBSD) techniques. Diamonds typically have complicated growth histories displaying alternating episodes of growth, dissolution, and post-growth deformation and crushing processes. Most crystals have endured both plastic and brittle deformation during the growth history. Abundant deformation and resorption/growth features suggest a highly dynamic growth environment for super-deep diamonds. High temperatures expected in the transition zone and lower mantle could explain the plastic deformations of super-deep diamonds with low nitrogen content.

Original languageEnglish
Article number18
Number of pages14
JournalMinerals
Volume10
Issue number1
DOIs
Publication statusPublished - Jan 2020

Keywords

  • Deformation
  • Diamond
  • Electron backscatter diffraction
  • Internal structure
  • MATO-GROSSO
  • JUINA AREA
  • INFRARED-ABSORPTION
  • NATURAL DIAMOND
  • NITROGEN AGGREGATE
  • MINERAL INCLUSIONS
  • diamond
  • LOWER MANTLE DIAMONDS
  • internal structure
  • DISSOLUTION
  • SAO LUIZ
  • deformation
  • PLASTIC-DEFORMATION
  • electron backscatter diffraction

Fingerprint

Dive into the research topics of 'Deformation features of super-deep diamonds'. Together they form a unique fingerprint.

Cite this