Aqueous speciation of iron and manganese chlorides in supercritical hydrothermal solutions

Etsuo Uchida, Y. Goryozono, M. Naito, M. Yamagami

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    Abstract

    Aqueous speciation of iron and manganese chlorides in supercritical hydrothermal solutions was determined by monitoring the effects of NaCl and KCl on the Ca/(Ca + Fe) and Ca/(Ca + Mn) ratios of aqueous chloride solutions in equilibrium with scheelite and ferberite and with scheelite and huebnerite, respectively. The ratios decrease significantly with increasing NaCl and KCl concentrations at both 400°C and 600°C. Based on the thermodynamic analysis of the experimental results, logarithms of the formation constants for FeCl- 3 aq were obtained to be 0.2(NaCl) and 1.2(KCl) for 400°C, and 1.9(NaCl) and 1.9(KCl) for 600°C, and those for MnCl- 3 aq to be 0.4(NaCl) and 1.1(KCl) for 400°C and 2.3(NaCl) and 2.3(KCl) for 600°C. -from Authors

    Original languageEnglish
    Pages (from-to)175-188
    Number of pages14
    JournalGeochemical Journal
    Volume29
    Issue number3
    Publication statusPublished - 1995

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    ASJC Scopus subject areas

    • Geochemistry and Petrology
    • Geophysics

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