| Budget Amount *help |
¥4,940,000 (Direct Cost: ¥3,800,000、Indirect Cost: ¥1,140,000)
Fiscal Year 2015: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2014: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2013: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
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| Outline of Final Research Achievements |
Koya low-aspect ratio ignimbrite sourced from Kikai caldera 7.3 ka and traveled across the sea to reach the adjacent islands and the mainland of south Kyushu 30-80 km distant. Proximal facies of Koya ignimbrite comprises three flow units with a maximum thickness of 30 m, but the distal deposits are consist of one flow unit and are very thin.
Koya ignimbrite are underlain by pumice-fall deposits and overlain by Akahoya ash. These pyroclastic units represent 7.3 ka Akahoya eruption from the Kikai caldera and commonly contains highly silicic glass shards and pumice of c. 75 wt% SiO2. Koya ignimbrite and Akahoya ash-fall deposit characteristically contain glass shards and pumice fragments of lower silica content down to c. 65 wt%. In addition to the silicic glass fragments, reflecting contribution this mafic component increases upwards from the basal to middle level of the deposit, and this vertical variation likely indicates progressive aggradation of pyroclasts.
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