| Project/Area Number |
15K13587
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| Research Category |
Grant-in-Aid for Challenging Exploratory Research
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| Allocation Type | Multi-year Fund |
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| Research Field |
Petrology/Mineralogy/Economic geology
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| Research Institution | Tohoku University |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
古川 善博 東北大学, 理学研究科, 助教 (00544107)
石橋 秀巳 静岡大学, 理学部, 准教授 (70456854)
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| Co-Investigator(Renkei-kenkyūsha) |
SUMINO Hirochika 東京大学, 大学院総合文化研究科, 准教授 (90332593)
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| Project Period (FY) |
2015-04-01 – 2017-03-31
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| Project Status |
Completed (Fiscal Year 2016)
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| Budget Amount *help |
¥3,510,000 (Direct Cost: ¥2,700,000、Indirect Cost: ¥810,000)
Fiscal Year 2016: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
Fiscal Year 2015: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
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| Keywords | マグマ / 硫黄 / 火山ガス / 減圧 / 酸化・還元 / 硫化金属 / 脱ガス |
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| Outline of Final Research Achievements |
Magmatic sulfur is released to the surface as a volcanic gas and it has a large impact on atmospheric chemistry and climate. Therefore, it is necessary to determine the partition of sulfur among gas, melt, and crystal. In this study, we investigated the partition of sulfur by performing decompression experiments. The decompression experiments were conducted at decompression rates of 1 to 900 MP/h that simulate a part of magma ascent during explosive to effusive eruptions. The experiments demonstrated that rapid decompression causes the oxidation of magma, resulting in sulfide breakdown. The partition between melt and crystal shows the dependence of decompression rate and hence we conclude that the composition of volcanic gas is controlled by the decompression rate.
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