Experiments on the simultaneous partitioning of divalent cations between pyrite or pyrrhotite and 2M aqueous chloride solution under supercritical conditions

Etsuo Uchida, Yusuke Hata, Hiro Uemura

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    Abstract

    The experiments on the simultaneous partitioning of divalent cations (Ni2+, Mg2+, Co2+, Zn2+, Fe2+, and Mn2+) between pyrite or pyrrhotite and 2M aqueous chloride solution were conducted under supercritical hydrothermal conditions of 500, 600, 700, and 800 °C, and 1 kb, using standard cold seal type pressure vessels. The experimental results revealed that the cations are preferentially partitioned into pyrite and pyrrhotite in the following orders, respectively: Co2+=Ni2+=Fe2+ > Zn2+ > Mg2+=Mn2+ for pyrite and Co2+ > Ni2+≥Fe2+ > Zn2+ > sMg2+=Mn2+ for pyrrhotite. If we assume that Mg2+ shows a partition behavior according to the ionic radius, the partition coefficient vs. ionic radius (PC-IR) curves for both pyrite and pyrrhotite mark a peak at 0.77 Å. Zn2+ shows a negative deviation from the PC-IR curves, but Ni2+ shows a positive deviation.

    Original languageEnglish
    Pages (from-to)124-134
    Number of pages11
    JournalJapanese Magazine of Mineralogical and Petrological Sciences
    Volume46
    Issue number4
    DOIs
    Publication statusPublished - 2017 Jan 1

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    Keywords

    • Aqueous chloride solution
    • Partition coefficient
    • PC-IR diagram
    • Pyrite
    • Pyrrhotite
    • Supercritical condition

    ASJC Scopus subject areas

    • Geochemistry and Petrology
    • Economic Geology

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