Petrological and thermodynamic constraints on carbonate stability in altered oceanic crust subducted to subarc depths: Insights from carbonate-bearing eclogites in the Western Alps

Table S1. Main minerals with estimated modal proportions and bulk-rock compositions of the studied carbonate-bearing Zermatt-Saas eclogites from the Western Alps.Table S2. Representative laser Raman spectra of fluid inclusions and carbonate minerals.Table S3. Representative mineral compositions of the studied carbonate-bearing Zermatt-Saas eclogites from the Western Alps.Table S4. Compilation of temperature estimates obtained from geothermometry.Table S5. Comparison of initial and remaining CO2 contents in decarbonation modelling of samples T94 and ZS99-5.Table S6. H2O and carbon survival rates, carbon concentrations, and oxygen fugacity during the subduction-exhumation process in samples T94 and ZS99-5.Table S7. Trace element compositions of the studied eclogites.Table S8. Variations of carbon survival rate and oxygen fugacity in T94 and ZS99-5 as a function of Fe3+/ΣFe and added carbon forms (graphite and CO2) during the subduction-exhumation process.Table S9. Variations in remaining CO2 content and carbon survival rate with increasing CaCO3 addition during the subduction-exhumation process for samples T94 and ZS99-5.Table S10. Comparison of H2O and carbon survival rates and carbon concentrations along subduction zone thermal gradients of 205°C/GPa and 235°C/GPa, up to 4 GPa.Table S11. Variations in H2O and carbon survival rates and complete decarbonation temperatures under varying subduction zone thermal gradients at subarc depths with different CaCO3contents (6.09 and 9.21 wt.%).Table S12. Variations in remaining CO2 content with fluid–rock mass ratio during external pure water fluid infiltration and fractionation under different P–T conditions for T94.