| Budget Amount *help |
¥18,070,000 (Direct Cost: ¥13,900,000、Indirect Cost: ¥4,170,000)
Fiscal Year 2021: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2020: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2019: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2018: ¥14,300,000 (Direct Cost: ¥11,000,000、Indirect Cost: ¥3,300,000)
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| Outline of Final Research Achievements |
In this study, we investigated how the rheological properties of materials existing at plate boundaries (i.e., metamorphic rocks) are changed by continuous metamorphic reactions associated with subduction using high-temperature, high-pressure rock deformation experiments. We found that the strength of the metamorphic rocks increases with the progress of metamorphism due to the decrease the amount of hydrous minerals by metamorphic reactions. On the other hand, the increase in pore fluid associated with metamorphic reactions increases the amount of water as well as the pore fluid pressure, which decreases the strength of the plate boundary. This study reveals that heterogeneity in water volume may be more responsible for the diversity of slip behavior in subduction zones than heterogeneity in pore water pressure.
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