| Project/Area Number |
23224012
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| Research Category |
Grant-in-Aid for Scientific Research (S)
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| Allocation Type | Single-year Grants |
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| Research Field |
Geology
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| Research Institution | Tokyo Institute of Technology |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
YOKOYAMA Tetsuya 東京工業大学, 大学院理工学研究科, 准教授 (00467028)
KAWAI Kenji 東京大学, 大学院総合文化研究科, 助教 (20432007)
SENSHU Hiroki 千葉工業大学, 惑星探査研究センター, 研究員 (30359202)
ZHAO Dapeng 東北大学, 理学研究科, 教授 (70304665)
OMORI Soichi 放送大学, 教養学部, 准教授 (90267469)
KOMABAYASHI Tetsuya エディンバラ大学, 地球科学科, 講師 (20444119)
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| Project Period (FY) |
2011-04-01 – 2016-03-31
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| Project Status |
Completed (Fiscal Year 2015)
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| Budget Amount *help |
¥166,530,000 (Direct Cost: ¥128,100,000、Indirect Cost: ¥38,430,000)
Fiscal Year 2015: ¥40,560,000 (Direct Cost: ¥31,200,000、Indirect Cost: ¥9,360,000)
Fiscal Year 2013: ¥45,240,000 (Direct Cost: ¥34,800,000、Indirect Cost: ¥10,440,000)
Fiscal Year 2012: ¥44,720,000 (Direct Cost: ¥34,400,000、Indirect Cost: ¥10,320,000)
Fiscal Year 2011: ¥36,010,000 (Direct Cost: ¥27,700,000、Indirect Cost: ¥8,310,000)
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| Keywords | 花崗岩質大陸地殻 / 構造浸食 / 沈み込み帯 / マントルダイナミクス / 第三大陸 / 原初大陸 / 大陸三層モデル / 構造侵食 / 第3大陸 / 大陸地殻 / 第二大陸 / マントル対流 |
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| Outline of Final Research Achievements |
This research demonstrates the presence of the second continent in the mantle transition zone, equivalent to ten times the volume of the continent. This is based on the quantitative evaluation of tectonic erosion through time and both the growth mechanism of granitic crust and quantification of its generation also through time. Furthermore, we revealed the history of dispersion and amalgamation of the 1.8 Ga supercontinent by radioactive heat effect of the third continent, and obtained evidence which strongly indicates that the third continent (fallen primordial continent, particularly KREEP basalt) is the main constituent of the “D” layer. Lastly, we proposed the model combining the three-layer model and the Earth history to systematize the mantle dynamics including that of the second continent. This model is to steer the research regarding the mechanism to generate the liquid core, which has not been unraveled by numerical computation of Earth’s convection, in a new direction.
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| Assessment Rating |
Verification Result (Rating)
A-
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Assessment Rating |
Result (Rating)
A-: Progress in the research is steadily towards the initial goal. However, further efforts are necessary as a part of the research progress is delayed.
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