Re-examination of the movement history of the Median Tectonic Line in Ina area
| Project/Area Number |
15K05318
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Geology
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| Research Institution | Waseda University |
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Principal Investigator |
Takagi Hideo 早稲田大学, 教育・総合科学学術院, 教授 (60154754)
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| Project Period (FY) |
2015-04-01 – 2018-03-31
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| Project Status |
Completed (Fiscal Year 2017)
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| Budget Amount *help |
¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
Fiscal Year 2017: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2016: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2015: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
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| Keywords | 中央構造線 / 断層ガウジ / K－Ar年代 / 活断層 / 伊豆孤の衝突 / K－Ar年代測定 / イライト / ポリタイプ / 赤石時階 / 先砥部時階 / 安康露頭 / 非時露頭 / 火山ガラス / 御嶽第一テフラ / K-Ar年代 |
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| Outline of Final Research Achievements |
From this research, the researcher got the following two results.
1. One of the faults along the Median Tectonic Line (MTL) transects a terrace deposit at Hiji Outcrop. We extracted volcanic glass shards from the deposit and determined bulk chemical composition of the glasses. The result is that the glasses are correlative with those from the Ontake tephra (On-Pm1), which was erupted at 100 Ka. Accordingly the MTL fault was reactivated as an active fault.
2. We collected fault gouges from several outcrops of the MTL and examined K-Ar ages and illite polytype component from four grain-size fractions divided. As a result, the fault gouges are formed by hydrothermal alteration associated with major fault movement at about 15 Ma , which is correlative with the beginning of the collision of Izu arc against the Honshu arc.
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Report
(4 results)
Research Products
(6 results)
