High-temperature-pressure experiments were carried out to determine the chlorine-hydroxyl exchange partition coefficient between hornblende and melt in the 1992 Unzen dacite. Cl in hornblende and melt was analyzed by electron microprobe, whereas OH in hornblende and melt was calculated assuming anion stoichiometry of hornblende and utilizing the dissociation reaction constant for H 2 O O 2(OH) in water-saturated melt, respectively. The partition coefficient strongly depends on the Mg/(Mg Fe) ratio of hornblende, and is expressed as ln
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H. Sato (2004) studied this question.
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