| Project/Area Number |
16K21531
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Multi-year Fund |
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| Research Field |
Geology
Petrology/Mineralogy/Economic geology
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| Research Institution | Okayama University of Science |
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Principal Investigator |
Aoki Kazumasa 岡山理科大学, 理学部, 准教授 (70586677)
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| Research Collaborator |
Komiya Tsuyoshi
Aoki Shogo
Tsuchiya Yuta
Sawaki Yusuke
Hirata Takafumi
Nishido Hirotsugu
Kato Daichi
Seo Yoshiki
Yamamoto Shinji
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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 |
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2018: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2017: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
Fiscal Year 2016: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
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| Keywords | ジルコン / 造山帯 / U-Pb年代 / 沈み込み帯 / 構造浸食 / U-Pb / 高圧変成岩 / 構造浸食作用 / 白亜紀 / 太古代 / 三波川帯 |
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| Outline of Final Research Achievements |
As a result of this research project, the exhumation mechanism of the high-pressure metamorphic rocks formed at the Cretaceous subduction zone in Japan was caused by not only shallowing subduction angle by application and subduction of ridge but also other multiple factors. They are considered to be reduction of sliding frictional force by fluid infiltration along the exhumation route, erosion in fore-arc materials by the tectonic erosion, and area expansion of back-flow in wedge mantle. This means that 'tectonic erosion' is one of the necessary conditions for the exhumation of the high-pressure-type metamorphic rocks in subduction zones.
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| Academic Significance and Societal Importance of the Research Achievements |
本研究の学術的意義は、古典的地質学・岩石学にジルコン年代学／地球化学という分析手法を組み合わせ、造山帯形成プロセスの核の１つである「高圧型変成岩上昇」に「構造浸食作用」が深く関わっていたことを示したことである。また、「日本列島を構成する基盤岩がその形成から現在に至る過程でどのように壊変・進化・成長してきたのか？」に対する新たな知見ももたらした。したがって、「火山・地震大国日本の形成・進化」に関する自然科学的教養の深化という意味でも本研究が果たした社会的意義は大きいだろう。
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