Mathematics
Scientific paper
Apr 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979gecoa..43..637g&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 43, Issue 4, pp.637-641
Mathematics
Scientific paper
It is shown mathematically that if the activity coefficient of water in ternary water-magma (aluminosilicate) systems is constant or varies only with the mole fraction of water, it is not necessary that the binary magmas form ideal solutions contrary to the claims by Burnham et al . (1978, Geochim. Cosmochim. Acta 42 , 275-276). A molecular viewpoint is presented to support this argument. The properties of analytical equations capable of representing the activity coefficients of usual and unusual systems are discussed. The correct form of the Gibbs-Dunhem equation for dissociative dissolution processes is presented to disprove the claims by (1975, Fortschr. Mineral. 52 , 101-118; 1975, Geochim. Cosmochim. Acta 39 , 1077-1084), and by et al . (1978, Geochim. Cosmochim. Acta 42 , 275-276).
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