Abstract
To clarify the element partitioning behavior between minerals and aqueous chloride solutions, we conducted experiments to investigate simultaneous partitioning of Ni2+, Mg2+, Co2+, Zn2+, Fe2+, and Mn2+ ions between alabandite (MnS) and 1 mol/L (Ni, Mg, Co, Zn, Fe)Cl2 aqueous solutions at 500–800 °C and 100 MPa. The bulk partition coefficients calculated using the following equation were in the order of Fe2+ > Co2+ > Ni2+ ≈ Zn2+ > Mn2+ >> Mg2+; KPN = (xMeS/mMeaq)/(xMnS/mMnaq). A partition coefficient-ionic radius (PC-IR) curve was plotted with the logarithmic value of the partition coefficient on the y-axis and the ionic radius at the six-fold coordinated site on the x-axis. The peak of this curve was located near the ionic radius of Fe2+ and not near the ionic radius of Mn2+. Zn2+ showed a slight negative partitioning anomaly, which increased in the order of sulfide minerals < arsenic sulfide minerals < arsenide minerals as the covalent bond became stronger. Ni2+ showed a positive partitioning anomaly, which indicated that it preferred an octahedral structure. The width of the PC-IR curve decreased in the order of sulfide minerals > arsenic sulfide minerals > arsenide minerals as the covalent bond became stronger, that is, the ion selectivity became stronger.
Highlights
Basic data about the partitioning behavior of elements between hydrothermal fluids and ore minerals are needed to clarify the formation conditions of hydrothermal ore deposits
Experiments were conducted to investigate the simultaneous partitioning of divalent metal ions (Ni2+, Mg2+, Co2+, Zn2+, Fe2+, and Mn2+ ) between alabandite and 1 mol/L (Ni, Mg, Co, Zn, Fe)Cl2 aqueous solutions
Alabandite is in the cubic system and is classified in the galena group
Summary
Basic data about the partitioning behavior of elements between hydrothermal fluids and ore minerals are needed to clarify the formation conditions of hydrothermal ore deposits. We have previously conducted experiments on the simultaneous partitioning of elements between minerals and aqueous chloride solutions under supercritical conditions for various minerals, including sulfide minerals, arsenic sulfide minerals, and arsenide minerals such as pyrite (FeS2 ), pyrrhotite (FeS) [2], arsenopyrite (FeAsS), cobaltite (CoAsS) [3], löllingite (FeAs2 ), and safflorite (CoAs2 ) [4]. These are important minerals among the ore minerals and have been used to investigate simultaneous partitioning of Ni, Mg, Co, Zn, Fe, and Mn between ore minerals and aqueous chloride solutions under supercritical conditions at 500–800.
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