Microphenocrystic pyrrhotite from dacite rocks of Satsuma-Iwojima,southwest Kyushu,Japan and the solubility of sulfur in dacite magma期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

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Microphenocrystic pyrrhotite from dacite rocks of Satsuma-Iwojima,southwest Kyushu,Japan and the solubility of sulfur in dacite magma

Authors:	Akira Ueda Tetsumaru Itaya

Institution:	(1) Institute of Petrology, Mineralogy and Economic Geology, Tohoku University, Aobayama, 980 Sendai, Japan;(2) Hiruzen Research Institute, Okayama University of Science, Kawakami, Maniwa-gun, 717-06 Okayama, Japan;(3) Present address: Institute for Thermal Spring Research, Okayama University, Misasa, 682-02 Tottori, Japan

Abstract:	Microphenocrystic pyrrhotites were observed in the glassy groundmass of two dacite rocks from Satsuma-Iwojima, southwest Kyushu, Japan. It suggests that the dacite magma was saturated with respect to pyrrhotite at the time of eruption, and thus the sulfur contents in the groundmass can be taken as the solubility of sulfur in the dacite magma. The solubility of sulfur in the dacite rocks thus calculated is 65 to 72 ppm sulfur at the estimated conditions of T=900±50°C, $f_{{\text{O}}_{\text{2}} } = 10^{ - 12 \pm 1}$ and $f_{{\text{S}}_{\text{2}} } = 10^{ - 0.6 \pm 0.6}$ atm.

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