Mineral-solution equilibria--III. The system Na 2 O---Al 2 O 3 ---SiO 2 ---H 2 O---HCl

Details Mineral-solution equilibria--III. The system Na 2 O---Al 2 O 3 ---SiO 2 ---H 2 O---HCl Mineral-solution equilibria--III. The system Na 2 O---Al 2 O 3 ---SiO 2 ---H 2 O---HCl

Jul 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980gecoa..44.1029p&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 44, Issue 7, pp.1029-1037

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Chemical equilibrium between sodium-aluminum silicate minerals and chloride bearing fluid has been experimentally determined in the range 500-700°C at 1 kbar, using rapid-quench hydrothermal methods and two modifications of the Ag + AgCl acid buffer technique. The temperature dependence of the thermodynamic equilibrium constant ( K ) for the reaction NaAlSi 3 O 8 + HCl o = NaCl o + 1/2 Al 2 SiO 5 , + 5/2 SiO 2 + 1/2 H 2 O Albite Andalusite Qtz. K = ( a NaCl o )/( a H 2 O )1/2/( a HCl o ) can be described by the following equation: log k = -4.437 + 5205.6/ T ( K ) The data from this study are consistent with experimental results reported by and (1975) for lower temperature equilibria defined by the assemblages albite + paragonite + quartz + fluid and paragonite + andalusite + quartz + fluid. Values of the equilibrium constants for the above reactions were used to estimate the difference in Gibbs free energy of formation between NaCl o and HCl o in the range 400-700°C and 1-2 kbar. Similar calculations using data from phase equilibrium studies reported in the literature were made to determine the difference in Gibbs free energy of formation between KCl o and HCl o . These data permit modelling of the chemical interaction between muscovite + kspar + paragonite + albite + quartz assemblages and chloride-bearing hydrothermal fluids.

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