| Project/Area Number |
24740355
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Multi-year Fund |
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| Research Field |
Petrology/Mineralogy/Science of ore deposit
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| Research Institution | Japan Agency for Marine-Earth Science and Technology (2013)
Tokyo Institute of Technology (2012) |
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Principal Investigator |
HAMADA Morihisa 独立行政法人海洋研究開発機構, 地球内部ダイナミクス領域, 研究員 (60456853)
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| Project Period (FY) |
2012-04-01 – 2014-03-31
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| Project Status |
Completed (Fiscal Year 2013)
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| Budget Amount *help |
¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000)
Fiscal Year 2013: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2012: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
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| Keywords | 斜長石 / 無水鉱物の水 / 島弧玄武岩マグマ / 伊豆大島火山 / 島弧玄武岩 / マグマ / 水 / 島孤玄武岩 |
|---|
| Research Abstract |
Nominally anhydrous minerals in igneous rocks contain trace amounts of hydrogen as impurities, which can be used as an indicator of dissolved H2O concentration in coexisting melt and behavior of H2O during degassing of magmas. In this project , correlations between hydrogen concentration in plagioclase and H2O concentration in coexisting basaltic melt was investigated based on melting experiments on hydrous basalts, which suggests that island arc basaltic magmas beneath frontal-arc volcanoes is H2O-rich. In order to confirm this view, geochemical variation of aphyric volcanic rocks collected from the Izu-Oshima volcano in the Izu arc for the past 40,000 years was reviewed to examine conditions at which major crystallization differentiation have taken place. The consistency between these two independent studies was confirmed.
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