Mineral equilibria in the six-component seawater system,Na-K-Mg-Ca-SO4-Cl-H2O at 25°C. II: Compositions of the saturated solutions |
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| Authors: | Charles E Harvie Hans P Eugster John H Weare |
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| Institution: | Department of Chemistry, University of California, San Diego, La Jolla, CA 92093, U.S.A.;Department of Earth and Planetary Sciences, The Johns Hopkins University, Baltimore, MD 21218, U.S.A.;Department of Chemistry, University of California, San Diego, La Jolla, CA 92093, U.S.A. |
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| Abstract: | Using the solubility model developed by Harvie and Weare (1980), the stable mineral-solution assemblages for the six-component system Na-K-Mg-Ca-SO4-Cl-H2O and its constituent 5-, 4- and 3-component systems at 25°C have been defined. Invariant point maps have been constructed showing the connections by univariant lines. The solubility volumes for all 20 minerals considered are also illustrated. Of the 37 invariant points, only 3 have solutions which are Ca-rich; the remaining 34 can be plotted in the reciprocal system Na-K-Mg-SO4-Cl, which is similar to the seawater system, except that the restriction of halite saturation has been removed. Application of these results and implications for the evolution of major brine types are briefly discussed. |
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