Implication of the temporal sulphur isotopic variation during the 2000 eruption of Miyakejima Volcano, Japan

Akira Imai, Nobuo Geshi, Taketo Shimano, Setsuya Nakada

研究成果: ジャーナルへの寄稿記事

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The variation of sulphur isotopic composition during the 2000 eruption of the Miyakejima Volcano was examined in order to monitor the temporal change of the volcanic activity. The δ34S values of water-soluble sulphate leached from volcanic ash effused during intermittent eruptions from July to September 2005 range from +5 to +11‰ with a fluctuation of ca 3‰ within a single eruption. The δ34S value of sulphuric acid mist collected with 'Cu-metal trap' placed on the flank of the volcano from December 2000 to January 2001 is +6.2‰. These sulphur isotopic compositions of sulphate, which were isotopically equilibrated in the subvolcanic hydrothermal system, indicate that the temperature of the hydrothermal system beneath the caldera increased after the period of intermittent phreatic and phreatomagmatic eruptions. Then, the δ34S value of sulphuric acid trapped from January to March 2001 was +9.0‰ and the δ34S value of water-soluble sulphate on volcanic ash emitted with minor eruption in May 2001 was +11.0‰, suggesting a decrease in temperature of the subvolcanic hydrothermal system.

元の言語英語
ページ(範囲)83-92
ページ数10
ジャーナルIsland Arc
16
発行部数1
DOI
出版物ステータス出版済み - 3 1 2007

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All Science Journal Classification (ASJC) codes

  • Geology

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