Stability of CO2 Fluid in Eclogitic Mantle Lithosphere: Thermodynamic Calculations
Abstract
:1. Introduction
2. Methods
3. Results
3.1. Pyrope–Grossular
3.2. Pyrope–Almandine–Grossular
3.3. Eclogite–CO2
4. Discussion
5. Conclusions
- (1)
- In the Prp–Grs+3CO2 system, from the low-pressure and high-temperature side, the Grt+CO2 field is limited by the reaction of the partial decomposition of garnet:Grt → Cpx ± Grtnew ± Crn.On the high-pressure and low-temperature side, the Grt+CO2 field is restricted by the reaction of the partial carbonation of garnet:Grt + 3CO2 → Grtnew + CO2 + Cal + Ky + Coe.On the low-pressure and low-temperature side, the field Grt+CO2 is limited by the combination of reactions 2 and 3. On the high-pressure and high-temperature side, the field Grt+CO2 is restricted by the system solidus and the formation of a carbonate melt. We also expect that adding water, which generally lowers the solidus, should restrict the CO2 fluid stability field. At Ca# of 20–30, the reaction lines of the partial and full carbonation of the grant are almost identical. As the Ca# of the system increases above 30, the lower boundary of the Grt+CO2 field shifts towards low pressures and high temperatures. However, because the full carbonation line hardly changes its position, the area where garnet can coexist with CO2 remains almost unchanged when the Ca# changes from 20 to 80.
- (2)
- The addition of almandine to the Prp–Grs+CO2 system shifts the limit of partial carbonation of garnet by 30–70 °C and the full carbonation of garnet by 100–140 °C below the Prp+CO2 line. The Grt+CO2 region appears at high temperatures and is continuous over the entire range of compositions. Along the Prp–Alm50Grs50 join, there is no garnet composition that would react with CO2 to produce the Carb+Ky+Coe assemblage directly. The regions of Grt+CO2 and Carb+Ky+Coe are separated by the Grt+CO2+Carb+Ky+Coe field. The composition of garnet in the field of partial carbonation is richer in the almandine component than that in the Grt+CO2 field.
- (3)
- In the eclogite–CO2 system, the lower boundary of the Grt+Cpx+CO2 assemblage almost coincides with the pyrope carbonation reaction. In the field of partial carbonation, the garnet and omphacite react with CO2 to form carbonate, kyanite, coesite, garnet, and clinopyroxene with a new composition. Due to the carbonation of clinopyroxene, the temperature of the partial carbonation of eclogite is significantly higher than that of garnet, which restricts the eclogite + CO2 stability field to pressures lower than the diamond stability field. The partial carbonation of the eclogite stabilizes the carbonate, kyanite, and coesite, wherein, the garnet composition shifts toward more almandine, while the clinopyroxene composition evolves to jadeite. This would extend the CO2 stability field in the eclogitic suite to lower temperatures. Yet, taking into account the fact that CO2 is in short supply under natural conditions, it should be completely spent on the carbonation of the eclogite just below the eclogite + CO2 field.
Author Contributions
Funding
Data Availability Statement
Acknowledgments
Conflicts of Interest
Abbreviations
Ank | ankerite |
Alm | almandine |
Arg | aragonite |
Cal | calcite |
Carb | carbonate |
Coe | coesite |
Cpx | clinopyroxene |
Crn | corundum |
Di | diopside |
Dol | dolomite |
Ecl | eclogite |
Grs | grossular |
Grt | garnet |
Jd | jadeite |
Ky | kyanite |
Mgs | magnesite |
Qz | quartz |
Prp | pyrope |
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Vinogradova, Y.G.; Shatskiy, A. Stability of CO2 Fluid in Eclogitic Mantle Lithosphere: Thermodynamic Calculations. Minerals 2024, 14, 403. https://doi.org/10.3390/min14040403
Vinogradova YG, Shatskiy A. Stability of CO2 Fluid in Eclogitic Mantle Lithosphere: Thermodynamic Calculations. Minerals. 2024; 14(4):403. https://doi.org/10.3390/min14040403
Chicago/Turabian StyleVinogradova, Yulia G., and Anton Shatskiy. 2024. "Stability of CO2 Fluid in Eclogitic Mantle Lithosphere: Thermodynamic Calculations" Minerals 14, no. 4: 403. https://doi.org/10.3390/min14040403