| Project/Area Number |
23KJ0536
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| Research Category |
Grant-in-Aid for JSPS Fellows
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| Allocation Type | Multi-year Fund |
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| Section | 国内 |
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| Review Section |
Basic Section 17040:Solid earth sciences-related
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| Research Institution | The University of Tokyo |
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Principal Investigator |
HE Xuejing 東京大学, 理学系研究科, 特別研究員(PD)
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| Project Period (FY) |
2023-04-25 – 2025-03-31
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| Project Status |
Granted (Fiscal Year 2023)
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| Budget Amount *help |
¥1,800,000 (Direct Cost: ¥1,800,000)
Fiscal Year 2024: ¥900,000 (Direct Cost: ¥900,000)
Fiscal Year 2023: ¥900,000 (Direct Cost: ¥900,000)
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| Keywords | deep fluorine cycle / subduction zone / hydrous minerals / hydrogen bond / high pressure |
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| Outline of Research at the Start |
F subduction is facilitated by hydrous minerals and phases. In this study, O-H…F hydrogen-bonding configurations of F-doped dense hydrous magnesium silicates will be investigated under high pressure and high temperature using combined experimental methods of structural and spectroscopic analyses.
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| Outline of Annual Research Achievements |
Hydrous minerals in subducting slabs play a significant role in transporting water and halogens into the deep mantle. Studying the physicochemical properties of halogen-bearing hydrous minerals under high pressure and high temperature is an essential issue to understand the coupled water-halogen subduction. This study is aimed at systematically investigating hydrogen-bonding configurations of F-bearing mantle hydrous minerals.
The research project carried out in the last fiscal year was “Hydrogen-bonding configurations of F-doped brucite”. The crystal structure, hydrogen sublattice structure, and hydrogen-bonding geometries of F-doped brucite were determined under ambient conditions and at high pressure. The hydroxyl vibrational properties were also studied.
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| Current Status of Research Progress |
Current Status of Research Progress
2: Research has progressed on the whole more than it was originally planned.
Reason
Difficulties were encountered in synthesizing phase A and phase E samples. The project of brucite was changed to be firstly conducted, and it moves on smoothly. Meaningful results have been obtained and were published in conferences. A manuscript is under preparation.
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| Strategy for Future Research Activity |
The research plans for the next fiscal year are as follows:
(1) Synthesizing phase A and phase E samples using the multi-anvil apparatus;
(2) Preparation and submission of the manuscript on the brucite project;
(3) Investigating elemental doping effects on the hydrogen-bonding configurations of phase A, phase E, and other mantle hydrous minerals under ambient conditions and at high pressure.
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