2022 Fiscal Year Final Research Report
Estimation of reaction kinetics of metamorphic minerals in crustal rocks
| Project/Area Number |
20K04116
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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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| Review Section |
Basic Section 17040:Solid earth sciences-related
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| Research Institution | National Institute of Advanced Industrial Science and Technology |
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Principal Investigator |
Miyazaki kazuhiro 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, 招聘研究員 (30358121)
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| Co-Investigator(Kenkyū-buntansha) |
池田 剛 九州大学, 理学研究院, 准教授 (40243852)
遠藤 俊祐 島根大学, 学術研究院環境システム科学系, 准教授 (60738326)
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| Project Period (FY) |
2020-04-01 – 2023-03-31
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| Keywords | 変成反応 / 成長動力学 / ガーネット / ジルコン / 沈み込み帯 / 火山弧 |
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| Outline of Final Research Achievements |
The kinetics of metamorphic reactions were estimated using garnet and zircon. Garnet is advantageous for temperature and pressure estimation, and zircon can be used for age dating. Both garnet and zircon formed in subduction zones are governed by interface-controlled growth kinetics. For garnet, a growth law that increases with grain size is observed. On the other hand, garnet and zircon formed in the deeper part of the volcanic arc and above solidus temperature, showed a diffusion-controlled growth kinetics. The determination of the growth kinetics of zircon allowed us to constrain the growth duration. Using the constrain, we detected the pulsed growth of zircon.
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| Free Research Field |
地球科学，岩石学，地質学
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| Academic Significance and Societal Importance of the Research Achievements |
反応動力学は，反応が時間と共にどのように進行するかを予測する．変成鉱物を用いた反応動力学識別に関する研究は，世界的にみても殆ど行われていないのが現状である．本研究では，沈み込み帯での地震の原因となり岩石の強度低下を引き起こす脱水反応の動力学，火山弧深部でマグマの発生を引き起こす岩石の部分溶融反応の動力学を，そのような場で形成され，現在地表に露出する岩石から推定する方法を提案した．
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