| Budget Amount *help |
¥17,940,000 (Direct Cost: ¥13,800,000、Indirect Cost: ¥4,140,000)
Fiscal Year 2024: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
Fiscal Year 2023: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
Fiscal Year 2022: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
Fiscal Year 2021: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
Fiscal Year 2020: ¥8,450,000 (Direct Cost: ¥6,500,000、Indirect Cost: ¥1,950,000)
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| Outline of Final Research Achievements |
Light Li isotope compositions indicative of fluid ascending from the Earth's deep interior were frequently observed near major fault zones such as the Arima-Takatsuki Fault Zone and the Median Tectonic Line in the southwest Japan foreland arc. Additionally, light Li isotope compositions similar to those found in Arima hot spring water were detected in Okayama Prefecture, which lacks major faults. On the other hand, it has become clear that the Li isotope ratios of deep-seated fluid components are heavier in the northeastern Japan forearc compared to the southwestern Japan forearc. The lighter Li isotope composition of deep-seated fluid components in the southwestern Japan forearc compared to the northeastern Japan forearc suggests that the young Philippine Sea Plate subducting beneath the southwestern Japan is at high temperatures, leading to dehydration in the forearc region and a high flux of slab-derived fluids.
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