Geotectonic analyses of the Hidaka Collision Zone, northern Japan, based on zircon U-Pb ages
| Project/Area Number |
16K05585
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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 | National Institute of Advanced Industrial Science and Technology |
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Principal Investigator |
TAKAHASHI Yutaka 国立研究開発法人産業技術総合研究所, 地質調査総合センター, 契約職員 (50357373)
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| Co-Investigator(Kenkyū-buntansha) |
山崎 徹 国立研究開発法人産業技術総合研究所, 地質調査総合センター, 主任研究員 (00396285)
七山 太 国立研究開発法人産業技術総合研究所, 地質調査総合センター, 上級主任研究員 (20357685)
御子柴 真澄 国立研究開発法人産業技術総合研究所, 地質調査総合センター, 主任研究員 (50358082)
志村 俊昭 山口大学, 大学院創成科学研究科, 教授 (70242451)
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| Research Collaborator |
Kemp A.I.S
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| Project Period (FY) |
2016-04-01 – 2019-03-31
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| Project Status |
Completed (Fiscal Year 2018)
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| Budget Amount *help |
¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
Fiscal Year 2018: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2017: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2016: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
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| Keywords | 北海道中軸帯 / 日髙帯 / 常呂帯 / 日髙変成帯 / 中の川層群 / U-Pb年代 / ジルコン / 日高帯 / 日高変成帯 / U-Pb 年代 / K-Ar 年代 |
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| Outline of Final Research Achievements |
Zircon U-Pb age datings for the metamorphic rocks in the upper sequence of the Hidaka metamorphic belt were carried out. The zircon U-Pb ages of biotite gneiss in the Satsunai River were 39.6 +/- 0.9 Ma for overgrowth rims (weighted average of a youngest age group) and 53.1 +/- 0.9 Ma for detrital cores (weighted average of a youngest age group).
Zircon U-Pb ages of cordierite-biotite gneiss in the Saruru River were 35.9 +/- 0.7 Ma for overgrowth rims (weighted average of a youngest age group) and 46.5 +/- 2.8 Ma for detrital cores (weighted average of a youngest age group). Based on the U-Pb ages, the upper sequence of the Hidaka metamorphic belt was metamorphosed at around 40-36 Ma. Also, the protolith of the biotite gneiss and cordierite-biotite gneiss (sedimentary rock) should be formed after ca. 53－47 Ma.
Therefore, the upper sequence of the Hidaka metamorphic belt has different history from the lower sequence, in which main metamorphism had taken place at around 20ー19 Ma.
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| Academic Significance and Societal Importance of the Research Achievements |
日高変成帯は島弧地殻の衝上断片と考えられており，グラニュライトから非変成堆積岩類までが連続して観察できる世界的に見ても貴重な地質帯である．
日高変成帯は下部層（グラニュライトー角閃岩相）及び上部層（角閃岩相ー緑色片岩相）に区分され，50 Ma前後の変成作用で形成されたと考えられていた．しかし，近年，下部層の深成・変成岩類から20ー19 Ma前後のジルコンUーPb年代が相次いで報告され，年代の再検討が求められている．そこで，日高変成帯上部層の変成岩類のジルコンUーPb年代を測定し，上部層の変成年代（40ー36 Ma前後）を確定するとともに原岩の堆積年代（53ー47 Ma以降）を明らかにした．
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Report
(4 results)
Research Products
(62 results)
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[Presentation] New U-Pb ages of the Nakanogawa Group in southern Hidaka Belt, northern Japan2016
Author(s)
Nanayama, F., Takahashi, Y., Yamasaki T., Nakagawa, M., Iwano, H. & Danhara, T.
Organizer
JpGU-AGU Joint Meeting
Place of Presentation
幕張メッセ（千葉県千葉市）
Year and Date
2016-05-22
Related Report
Int'l Joint Research
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[Book] Granitic Rocks. In Moreno, T., Wallis, S. R., Kojima, T. and Gibbons, W., Eds., Geology of Japan.2016
Author(s)
Nakajima, T., Takahashi, M., Imaoka, T. and Shimura, T.
Total Pages
522
Publisher
Geological Society of London
Related Report
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