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CO2 solubility and solubility mechanisms in silicate melts at high pressures

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Abstract

CO2 solubility has a slight negative temperature dependence in olivine melilitite at 30 kb with 9% CO2 dissolved at 1,450 °C, 8.5% at 1,550 °C and 8.3% at 1,650° C. CO2 is dissolved as the carbonate molecule (CO 2−3 ) only. Feldspar melts (albite-anorthite) dissolve much less CO2 at 30 kb (around 2%) with a slight increase with increasing anorthite content. A CO2 absorption peak in infrared spectra of albite-rich glasses diappears in favour of the CO 2−3 peak with increasing anorthite content. It is inferred that CO2 was present as CO 2−3 in albite-rich melts also, but reverts to CO2 during quenching because of bonding differences related to Ca2+ and Na+ in the melts.

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  1. Research School of Earth Sciences, Australian National University Canberra, Australia

    G. Brey

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  1. G. Brey
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Brey, G. CO2 solubility and solubility mechanisms in silicate melts at high pressures. Contr. Mineral. and Petrol. 57, 215–221 (1976). https://doi.org/10.1007/BF00405226

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  • DOI: https://doi.org/10.1007/BF00405226

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