| Budget Amount *help |
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2019: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2018: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2017: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
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| Outline of Final Research Achievements |
The geology and paleomagnetism of Miocene volcanic rocks in central Nagano Prefecture were investigated to clarify the formation of curvature of the Median Tectonic Line. A radiometric age of about 15.8 Ma (15.8 million years ago) was obtained from andesitic lava in the Moriya-san area. Based on the radiometric data and geological relationships, the volcanic rocks in the Moriya-san and Takato areas were formed in a short geological time (within a few hundred thousand years) around 16 Ma. The paleomagnetic directions of the two areas are similar and indicate a counterclockwise rotation of 30-40 degrees relative to the Asian continent. Prior to the rotation, the surface trace of the Median Tectonic Line from eastern Aichi Prefecture to central Nagano Prefecture is thought to have been straight.
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