High‐pressure Raman study of nyerereite from Oldoinyo Lengai

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 sp...

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Bibliographic Details
Published in:Journal of Raman spectroscopy 2017-11, Vol.48 (11), p.1438-1442
Main Authors: Rashchenko, Sergey V., Goryainov, Sergey V., Romanenko, Alexander V., Golovin, Alexander V., Korsakov, Andrey V., Moine, Bertrand N., Mikhno, Anastasia O.
Format: Article
Language:English
Subjects:
carbonate
Compression
Compression tests
diamond anvil cell
Diamonds
Earth Sciences
Geochemistry
high pressure
Hydrostatic compression
Lava
Minerals
nyerereite
Olivine
Pressure
Raman spectra
Raman spectroscopy
Sciences of the Universe
Sodium
Sodium carbonate
Volcanoes
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Summary: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(CO32−) band (710 cm−1 at ambient pressure) and ν1(CO32−) 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. Copyright © 2017 John Wiley & Sons, Ltd. Secondary melt inclusion in olivine xenocryst from the Udachnaya‐East kimberlite.
ISSN:0377-0486
1097-4555
DOI:10.1002/jrs.5152