Crustal rotation and unconformity in central Honshu caused by collision of the Izu-Bonin arc
Project/Area Number |
26400488
|
Research Category |
Grant-in-Aid for Scientific Research (C)
|
Allocation Type | Multi-year Fund |
Section | 一般 |
Research Field |
Geology
|
Research Institution | Aichi University of Education |
Principal Investigator |
HOSHI Hiroyuki 愛知教育大学, 教育学部, 准教授 (90293737)
|
Project Period (FY) |
2014-04-01 – 2017-03-31
|
Project Status |
Completed (Fiscal Year 2016)
|
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)
|
Keywords | 地質学 / テクトニクス / 島弧衝突 / 回転運動 / 古地磁気 / 岩石磁気 |
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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Report
(4 results)
Research Products
(56 results)