2016 Fiscal Year Final Research Report
Sulfur partition among gas, melt, and crystal during magma decompression
| 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(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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| Keywords | マグマ / 硫黄 / 火山ガス / 減圧 / 酸化・還元 / 硫化金属 |
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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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| Free Research Field |
火山学
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