| Budget Amount *help |
¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000)
Fiscal Year 2016: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2015: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2014: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
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| Outline of Final Research Achievements |
The geology and paleomagnetism of Miocene sediments on the Kanto Mountains (KM) were investigated in order to study the temporal relationship between crustal rotation and 15-Ma unconformity in central Honshu caused by collision of the Izu-Bonin arc. Results show that the KM rotated more than 90° clockwise after 17 Ma. However, smaller (30-40°) clockwise deflection of paleomagnetic direction was observed in middle Miocene strata located above the unconformity. These observations indicate that the vertical movement of crust, which resulted in the 15-Ma formation of unconformity, was accompanied by ~50° clockwise rotation. Results also indicate little rotation during the period between 15 and 10 Ma and then ~30° clockwise rotation after 10 Ma.
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