2018 Annual Meeting of the Japan Association of Mineralogical Sciences field trip report: Excursion to the Zao hot spring alteration zone and occurrence of selenite

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  • 日本鉱物科学会2018年年会巡検報告蔵王温泉変質帯と透明石膏の産状
  • ニホン コウブツ カガクカイ 2018 ネンネンカイ ジュンケン ホウコク ザオウ オンセン ヘンシツタイ ト トウメイ セッコウ ノ サンジョウ

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<p>A field excursion to a selenite outcrop near the Zao hot spring and to the Zao volcano was held as one of the final events of the 2018 Annual Meeting of the Japan Association of Mineralogical Sciences on September 19, 2018. The formation processes of the selenite in the outcrop are summarized as follows: 1) the selenite was formed by sulfate ions in hot water originated from the Zao hot spring, in combination with Ca ions in host rocks; 2) the selenite favors neutral pH conditions in which smectite is stable, however there is no selenite occurrence in an acidic alteration zone where kaolinite and pyrite are stable. The Zao hot spring is closely connected with a large explosion of the volcano, and the selenite was formed by sulfate-rich acid water from the hot spring, therefore the hot spring and selenite are two of the blessings of the Zao volcano.</p>

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