2023 Fiscal Year Research-status Report
フッ素が沈み込むスラブ中のDHMS含水相の圧力と温度応答に与える影響
| Project/Area Number |
23KJ0536
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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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| Keywords | deep fluorine cycle / subduction zone / hydrous minerals / hydrogen bond / high pressure |
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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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| Causes of Carryover |
A trip to Europe was planned in the fiscal year of 2023 for an international joint research, but it was delayed. This planned trip will be made in the fiscal year of 2024.
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[Journal Article] Hydroxyl group/fluorine disorder in deuterated magnesium hydroxyfluoride and behaviors of hydrogen bonds under high pressure2024
Author(s)
Xuejing He, Hiroyuki Kagi, Kazuki Komatsu, Riko Iizuka-Oku, Hajime Okajima, Takanori Hattori, Asami Sano-Furukawa, Shinichi Machida, Jun Abe, Hirotada Gotou, Satoshi Nakano
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Journal Title
Journal of Molecular Structure
Volume: 1310
Pages: 138271
DOI
Peer Reviewed / Int'l Joint Research
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