High-pressure Raman study of nyerereite from Oldoinyo Lengai

Sergey V. Rashchenko*, Sergey V. Goryainov, Alexander V. Romanenko, Alexander V. Golovin, Andrey V. Korsakov, Bertrand N. Moine, Anastasia O. Mikhno

*Corresponding author for this work

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

A rare sodium carbonate nyerereite, (Na,K)2Ca(CO3)2, first found in unique natrocarbonatite lava of Oldoinyo Lengai volcano, also attracted a lot of attention as an inclusion phase in mantle minerals formed in the course of deep carbonatite magmatism. We measured the evolution of nyerereite Raman spectra under quasi-hydrostatic compression up to 6.4 GPa using a diamond anvil cell. The ν4(CO3 2-) band (710 cm-1 at ambient pressure) and ν1(CO3 2-) doublet (1077 and 1086 cm-1 at ambient pressure) demonstrated a positive pressure shift with dν/dP irregularities at 0.5 and 3.0 GPa. The obtained calibration was then used for residual pressure measurements in nyerereite-bearing inclusions in olivine from the Udachnaya-East kimberlite.

Original languageEnglish
Pages (from-to)1438-1442
Number of pages5
JournalJournal of Raman Spectroscopy
Volume48
Issue number11
DOIs
Publication statusPublished - Nov 2017
Externally publishedYes

Keywords

  • nyerereite
  • carbonate
  • high pressure
  • Raman spectroscopy
  • diamond anvil cell

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