Silicate melt inclusions in diamonds of eclogite paragenesis from placers on the Northeastern Siberian Craton

Vladislav Shatsky, Dmitry Zedgenizov, Alexey Ragozin, Viktoriya Kalinina

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

New findings of silicate-melt inclusions in two alluvial diamonds (from the Kholomolokh placer, northeastern Siberian Platform) are reported. Both diamonds exhibit a high degree of N aggregation state (60-70% B) suggesting their long residence in the mantle. Raman spectral analysis revealed that the composite inclusions consist of clinopyroxene and silicate glass. Hopper crystals of clinopyroxene were observed using scanning electron microscopy and energy-dispersive spectroscopic analyses; these are different in composition from the omphacite inclusions that co-exist in the same diamonds. The glasses in these inclusions contain relatively high SiO2, Al2O3, Na2O and, K2O. These composite inclusions are primary melt that partially crystallised at the cooling stage. Hopper crystals of clinopyroxene imply rapid cooling rates, likely related to the uplift of crystals in the kimberlite melt. The reconstructed composition of such primary melts suggests that they were formed as the product of metasomatised mantle. One of the most likely source of melts/fluids metasomatising the mantle could be a subducted slab.

Original languageEnglish
Article number412
Number of pages11
JournalMinerals
Volume9
Issue number7
DOIs
Publication statusPublished - 1 Jul 2019

Keywords

  • Diamond
  • Diamond-forming fluids/melts
  • Mantle
  • Melt inclusions
  • Mineral inclusions
  • BEARING ECLOGITE
  • YAKUTIA
  • melt inclusions
  • PIPE
  • UDACHNAYA KIMBERLITE
  • FLUID INCLUSIONS
  • diamond-forming fluids
  • MANTLE
  • mineral inclusions
  • MINERAL INCLUSIONS
  • diamond
  • EVOLUTION
  • GROWTH
  • mantle
  • FIBROUS DIAMONDS
  • melts

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