Experimental studies on ion exchange equilibria between minerals and aqueous chloride solution in the system CaWO4-FeWO4-MnWO4 under supercritical condition

Etsuo Uchida, Masataka Gima, Naoya Imai, Junichi Sugihara

    Research output: Contribution to journalArticle

    8 Citations (Scopus)

    Abstract

    Ion exchange experiments in the system CaWO4-FeWO4-MnWO4-(Ca, Fe2+, Mn2+)Cl2-H2O, corresponding to scheelite-ferberite-huebnerite series mineral as solid phase, were carried out at 400 and 600°C under 1000 kg/cm2. Ferberite and huebnerite form a continuous solid solution (wolframite ss), which may exhibit thermodynamically ideal behavior. Also, ferrous ion tends to concentrate preferably into wolframite ss than into aqueous chloride solution. This tendency becomes more pronounced with decreasing temperature. Scheelite and wolframite ss do not dissolve into each other essentially, but form a wide miscibility gap. The Ca/(Ca+Fe2++Mn2+) mole ratios of aqueous chloride solution coexisting with both minerals are about 0.65 at 400°C and 0.3 at 600°C. Temperature has a significant effect on the mole ratio, although a slight variation due to the compositional change of wolframite ss is recognized. The present experimental results cast a doubt on “wolframite geothermometer”.

    Original languageEnglish
    Pages (from-to)339-347
    Number of pages9
    JournalGeochemical Journal
    Volume23
    Issue number6
    DOIs
    Publication statusPublished - 1989

    ASJC Scopus subject areas

    • Geophysics
    • Geochemistry and Petrology

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