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

Research output: Contribution to journalArticlepeer-review

6 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 - 1 Nov 2017

Keywords

  • carbonate
  • diamond anvil cell
  • high pressure
  • nyerereite
  • Raman spectroscopy
  • INCLUSIONS
  • MANTLE MINERALS
  • VOLCANO
  • TANZANIA

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