| Budget Amount *help |
¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2017: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2016: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2015: ¥3,380,000 (Direct Cost: ¥2,600,000、Indirect Cost: ¥780,000)
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| Outline of Final Research Achievements |
Crystal size distributions of groundmass minerals of the Nosappumisaki intrusion were analyzed using a polarization film rotating thin section observation system. This system produces maps of mineral retardation and primary-axis direction in thin section samples. Mineral types observed in thin sections were identified using the generated retardation maps, and the grain boundaries were delimited using primary-axis direction maps. The data reveal that there is a systematic variation in the crystal sizes of constituent alkali feldspar (plagioclase), biotite, and magnetite that suggests solidification by thermal conduction originating near the lowermost contact surface with the host rock, and proceeding toward the inner region of the Nosappumisaki magma chamber.
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