Abstract
Hydrothermal reversal experiments have been performed on the upper pressure stability of paragonite in the temperature range 550–740 ° C. The reaction
has been bracketed at 550 ° C, 600 ° C, 650 ° C, and 700 ° C, at pressures 24–26 kb, 24–25.5 kb, 24–25 kb, and 23–24.5 kb respectively. The reaction has a shallow negative slope (− 10 bar °C−1) and is of geobarometric significance to the stability of the eclogite assemblage, omphacite+kyanite.
The experimental brackets are thermodynamically consistent with the lower pressure reversals of Chatterjee (1970, 1972), and a set of thermodynamic data is presented which satisfies all the reversal brackets for six reactions in the system Na2O-Al2O3-SiO2-H2O. The Modified Redlich Kwong equation for H2O (Holloway, 1977) predicts fugacities which are too high to satisfy the reversals of this study. The P-T stabilities of important eclogite and blueschist assemblages involving omphacite, kyanite, lawsonite, Jadeite, albite, chloritoid, and almandine with paragonite have been calculated using thermodynamic data derived from this study.
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Abbreviations
- P :
-
Pressure
- T :
-
Temperature (in Kelvins, unless specified)
- R :
-
Gas constant
- ΔH 0298 :
-
Enthalpy of reaction at 298 K, 1 bar
- ΔS 0298 :
-
Entropy of reaction at 298 K, 1 bar
- ΔC oP :
-
Change in heat capacity of reaction at 1 bar, T
- ΔV os :
-
Change in volume of the solid phases at 298 K, 1 bar
- \(f_{{\text{H}}_{\text{2}} {\text{O, P, T}}} \) :
-
Fugacity of water at P, T. Reference state is unit fugacity at 1 bar, T
- Δ f C Ps :
-
Change in heat capacity of formation (from the elements) of the solids in a reaction
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Holland, T.J.B. Experimental determination of the reaction paragonite=jadeite+kyanite+H2O, and internally consistent thermodynamic data for part of the system Na2O−Al2O3−SiO2−H2O, with applications to eclogites and blueschists. Contr. Mineral. and Petrol. 68, 293–301 (1979). https://doi.org/10.1007/BF00371551
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DOI: https://doi.org/10.1007/BF00371551