| Project/Area Number |
25800293
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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/Economic geology
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| Research Institution | Shizuoka University |
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Principal Investigator |
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| Project Period (FY) |
2013-04-01 – 2017-03-31
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| Project Status |
Completed (Fiscal Year 2016)
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| Budget Amount *help |
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2015: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2014: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2013: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
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| Keywords | マグマ / レオロジー / 結晶 / サスペンジョン / 粘性－脆性遷移 / 熔岩流 / 桜島火山 / 非ニュートン流体 / 噴火 / 火山噴火 / テクスチャー / 富士山 / 斜長石 / 粘性率 |
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| Outline of Final Research Achievements |
High-temperature uniaxial compression viscometry was done for highly viscous lavas, including crystal and bubble-free obsidian, bubble-free andesitic lava with 38 vol.% microlites, and three-phase andesitic lava from Sakurajima volcano. Present results suggest that (1) uniaxial compression viscometry is an useful tool to investigate highly viscous, multi-phase lavas, (2) the existing melt-viscosity model of Giordano et al. (2008) is valid, and (3) preferred orientation of plagioclase crystals strongly influences on lava viscosity. In addition, quantitative rheological model is established and shear rate-temperature condition at which viscous-brittle transition occurs is determined for crystal- and bubble-bearing andesitic magma which is representative at Sakurajima volcano. Present results may be helpful for simulating lava flow dynamics of Sakurajima volcano and other andesitic volcanoes.
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