| Project/Area Number |
10440144
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| Research Category |
Grant-in-Aid for Scientific Research (B).
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Geology
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| Research Institution | Himeji Institute of Technology |
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Principal Investigator |
GOTO Atsushi (2000) Himeji Institute of Technology, Faculty of Science, Research associate, 理学部, 助手 (50211917)
松田 高明 (1998-1999) 姫路工業大学, 理学部, 教授 (50145827)
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| Co-Investigator(Kenkyū-buntansha) |
MORINAGA Hayao Faculty of Science, Himeji Institute of Technology Associate Professor, 理学部, 助教授 (40210182)
MATSUDA Takaaki Himeji Institute of Technology, Faculty of Science, Professor, 教授(技官) (50145827)
後藤 篤 姫路工業大学, 理学部, 助手 (50211917)
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| Project Period (FY) |
1998 – 2000
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| Project Status |
Completed (Fiscal Year 2000)
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| Budget Amount *help |
¥2,300,000 (Direct Cost: ¥2,300,000)
Fiscal Year 2000: ¥1,100,000 (Direct Cost: ¥1,100,000)
Fiscal Year 1999: ¥1,200,000 (Direct Cost: ¥1,200,000)
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| Keywords | Elevated peneplain / Apatite / Fission track dating / Closure temperature / Thermochronology / Track length / Granitic rocks / Cretaceous volcanic rocks / 日本列島 / ジルコン / 白亜紀花崗岩類 / 中新世花崗岩類 / 阿武隈帯 / 領家帯 |
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| Research Abstract |
As Matsuda et al., (1997) made clear, the titanite, zircon and apatite fission track ages whose ages provide the cooling ages down to about 300℃, 240℃ and 110℃ respectively were younger than the formation ages of the granitic rocks of the Hida mountains. For the Hida granitic rocks, the apatite fission track ages are rather narrow in range from 40 to 50 Ma, although the zircon fission track ages are wide in range from 99 to 172 Ma. They pointed out that the latest uplift and cooling age that is assumed to be equal to the apatite fission track age with closure temperature of 110℃ was similar through the Hida mountains, 40-50 Ma. Further, they concluded that the age corresponded to the formation age of the elevated peneplain in the Hida mountains. The present work is an extension of their work for detarmination of the formation age of the elevated peneplains of the Japanese Islands. For the present work, we determined the apatite fission track ages of granitic rocks and Cretaceous volcanic rocks. The apatite fission track ages are as follows ; the Kitakami mountains, 82-100 Ma ; the Abukuma mountains, 46-78 Ma (mostly 55-70 Ma) ; Mt. Goto in Niigata prefecture, 6.08 Ma ; the Hida mountains, 40-50 Ma (the pattern of their track length is of slow cooling) ; granitic and acidic volcanic rocks in Chubu district, 45-55 Ma ; Chugoku district, 16-30 Ma ; Awaji and Shikoku islands, 28-46 Ma. The age is narrow in each area. The cooling by about 110℃ differs between areas of the Japanese islands. This suggests that the formation ages of the elevated peneplain deduced from the apatite fission track dating are different from place to place after the Cretaceous time.
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