Water and magmas: application of the Gibbs-Duhem equation |
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| Authors: | James L Dye Thomas A Vogel |
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| Institution: | Department of Chemistry, Michigan State University, East Lansing, MI 48824, U.S.A.;Department of Geology, Michigan State University, East Lansing, MI 48824, U.S.A. |
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| Abstract: | Burnham (1975a, b) has shown that in several alumino-silicate systems Henry's law constant is independent of silicate melt composition up to XmeltH2O = 0.5. He has used this fact to conclude that such silicate melts behave ideally over a wide range of compositions based on the application of the Gibbs-Duhem relation. Unless Henry's law is valid up to XmeltH2O = 1.0, the application of the Gibbs—Duhem relation to three component systems only shows that if one component obeys Henry's law, the other two components follow the two component Gibbs-Duhem equation. There is no thermodynamic requirement of ideality. |
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