2015 Fiscal Year Annual Research Report
海底火山から採取した軽石試料を用いて、水中軽石中の気泡の成長履歴を明らかにする
| Project/Area Number |
14F03772
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| Research Institution | Japan Agency for Marine-Earth Science and Technology |
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Principal Investigator |
Nichols Alexande 国立研究開発法人海洋研究開発機構, 海洋掘削科学研究開発センター, 主任技術研究員 (00470120)
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| Co-Investigator(Kenkyū-buntansha) |
McIntosh Iona 国立研究開発法人海洋研究開発機構, 海洋掘削科学研究開発センター, 外国人特別研究員
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| Project Period (FY) |
2014-04-25 – 2016-03-31
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| Keywords | submarine eruptions / Oomurodashi / Kurose-Nishi / water contents / water speciation / hydration / FTIR spectroscopy / absorption coefficients |
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| Outline of Annual Research Achievements |
FY26 a model was developed to correct for post-eruption hydration using water speciation (OH and molecular H2O) measured by FTIR. However, accurate measurement of OH, obtained indirectly from total H2O concentration, is essential. FY27 a formula using species-dependent molar absorption coefficients was derived to accurately obtain OH to reconstruct original total H2O contents. Applying this to pumice from Oomurodashi and Kurose-Nishi submarine volcanoes in the Izu Arc gives reconstructed total H2O contents that relate to pumice texture.
A better understanding of silicate peaks that appear on FTIR spectra of rhyolite glass has also been obtained. While these provide a means to estimate glass thickness they also interfere with the molecular H2O peak.
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| Research Progress Status |
27年度が最終年度であるため、記入しない。
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| Strategy for Future Research Activity |
27年度が最終年度であるため、記入しない。
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