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The system NaAlSi2O6‒CaMgSi2O6−CO2 at 3–6.5 GPa: implications for CO2 stability in the eclogitic suite at depths of 100–200 km

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Abstract

In this work, we studied the phase relationships in the NaAlSi2O6–CaMgSi2O6–CO2 system in the range of 3–6.5 GPa and 900–1500 ℃ using a multianvil press. The duration of most experiments varied from 5 to 9 days. Equilibrium was examined from both sides using oxide-carbonate mixtures and diopside-jadeite glasses with Ag2C2O4 as starting materials. We found that the subsolidus assemblage is represented by clinopyroxene, coesite, dolomite, and CO2 fluid. The solidus of the system passes through 1015 ℃/3 GPa and 1095 ℃/6 GPa, and has a slope of 38 MPa/℃. The near-solidus carbonate melt contains 1–4 mol% SiO2 and 1–4 mol% Na2O. We found that clinopyroxene can be in equilibrium with CO2 fluid under P–T conditions corresponding to the diamond stability field to at least 6–6.5 GPa and 1050–1100 ℃. Yet, the composition of such clinopyroxene corresponds to almost pure jadeite, Jd# 95–97. Thus, the infiltration of CO2 fluid into eclogite under conditions of the continental lithospheric mantle should be accompanied by partial carbonation of clinopyroxene with the formation of a low-Mg carbonate melt with moderate concentrations of sodium. As a result of the reaction, the compositions of clinopyroxenes of eclogites of Groups A and B should shift towards a high-jadeite composition corresponding to eclogites of Group C.

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Data availability

The datasets generated and analyzed during the current study are available from the corresponding author (Sahstkiy Anton shatskiyantonf@gmail.com) on the reasonable request.

Abbreviations

Ca#:

Ca/(Ca + Mg) × 100 mol%

Cal:

Calcite

Coe:

Coesite

Cpx:

Clinopyroxene

Di:

Diopside

Dol:

Dolomite

Eit:

Eitelite

Jd:

Jadeite

Jd#:

Jd/(Jd + Di) × 100 mol%

F:

Fluid

Gr:

Graphite

L:

Liquid

Mgs:

Magnesite

Na2#:

Na2O/(Na2O + CaO + MgO) × 100 mol%

Qz:

Quartz

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Acknowledgements

We are grateful to Dante Canil for editorial handling and comments and two anonymous referees for reviews, which helped to improve manuscript; Ivan V. Podborodnikov and Altyna Bekhtenova for technical support; Anatoly T. Titiv and Nikolay S. Karmanov for their help in the analytical work. This work was financially supported by Russian Science Foundation (project No 21-17-00024).

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Authors and Affiliations

  1. Vernadsky Institute of Geochemistry and Analytical Chemistry, Russian Academy of Science, Moscow, 119991, Russia

    Anton Shatskiy, Yulia G. Vinogradova & Anton V. Arefiev

  2. Vereshchagin Institute for High Pressure Physics, Russian Academy of Science, Troitsk, Moscow, 108840, Russia

    Konstantin D. Litasov

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  1. Anton Shatskiy
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  2. Yulia G. Vinogradova
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  3. Anton V. Arefiev
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Correspondence to Anton Shatskiy.

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Shatskiy, A., Vinogradova, Y.G., Arefiev, A.V. et al. The system NaAlSi2O6‒CaMgSi2O6−CO2 at 3–6.5 GPa: implications for CO2 stability in the eclogitic suite at depths of 100–200 km. Contrib Mineral Petrol 178, 22 (2023). https://doi.org/10.1007/s00410-023-01999-w

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