TOHOKU UNIVERSITY Researchers

Research History 6

2025/10 - Present

Carnegie Institution for Science　Visiting scholar, JSPS Overseas Research Fellow
2025/04 - Present

Department of Earth Science, Graduate School of Science, Tohoku University
2022/04 - 2025/03

Japan Society for the Promotion of Science, Research Fellowships for Young Scientists (PD)
2023/04 - 2023/09

Carnegie Institution for Science, Earth and Planets Laboratory
2019/04 - 2022/03

Japan Society for the Promotion of Science, Research Fellowships for Young Scientists (DC1)
2018/10 - 2022/03

The International Joint Graduate Program students in Earth and Environmental Sciences, Tohoku University

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Education 3

Tohoku University　Department of Earth Science, Graduate School of Science　Doctoral course

2019/04 - 2022/03
Tohoku University　Department of Earth Science, Graduate School of Science　Master course

2017/04 - 2019/03
Tohoku University　Department of Earth Science

2013/04 - 2017/03

Professional Memberships 3

アメリカ鉱物学会
日本鉱物科学会
日本地球惑星科学連合

Research Interests 6

実験岩石学
プレート沈み込み帯
地球化学
流体
ラマン分光
高温高圧実験

Research Areas 1

Natural sciences / Solid earth science /

Awards 3

Kuroda Chika Award

2022　Graduate School of Science, Tohoku University
JpGU Meeting 2021 Outstanding Student Presentation Award

2021　HDAC experiments on silica solubility and speciation in Na2CO3–H2O fluids at high pressure and temperature
JpGU–AGU Joint Meeiting 2017 Outstanding Student Presentation Award

2017　Geochemical study of P-type jadeitites (jadeite precipitates) from the New Idria serpentinite body, California

Papers 10

Direct observation of shock-induced formation of davemaoite, Ca-perovskite Peer-reviewed

Mujin Lee, Sota Takagi, Minsu Jang, Gunhee Lee, Hyunseung Lee, Naoko Takahashi, Jinhyuk Choi, Yongmoon Lee, Donghoon Seoung, Chaewon Park, Kohei Miyanishi, Toshinori Yabuuchi, Norimasa Ozaki, Tatiana Pikuz, Hirotaka Nakamura, Alexis Amouretti, Yingwei Fei, Sally J. Tracy, Huijeong Hwang, Donghoon Kim

Nature Communications　2026/08/27
Publisher: Springer Science and Business Media LLC
DOI： 10.1038/s41467-026-76624-y 　

eISSN： 2041-1723
Structural Response of Laser‐Driven Shock Compressed Albite Peer-reviewed

Sota Takagi, Naoko Takahashi, Minsu Jang, Huijeong Hwang, Jinhyuk Choi, Hyunseung Lee, Yongmoon Lee, Donghoon Seoung, Hiroki Kobayashi, Norimasa Ozaki, Tatiana Pikuz, Hirotaka Nakamura, Alexis Amouretti, Toshinori Yabuuchi, Kohei Miyanishi, Donghoon Kim

Geophysical Research Letters　53　(12)　2026/06/19
Publisher: American Geophysical Union (AGU)
DOI： 10.1029/2025gl119542 　

ISSN： 0094-8276

eISSN： 1944-8007

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Abstract Plagioclase records characteristic shock features that constrain meteorite impact conditions, but its phase evolution along the Hugoniot remains unresolved. We investigated shock‐induced phase transition in albite using in situ X‐ray diffraction during laser‐driven shock at 14–66 GPa. Albite retained its crystal structure up to at least 14 GPa and underwent complete amorphization above 28 GPa, at pressures lower than those reported in shock‐recovery experiments. No hollandite‐type phase, jadeite, or Ca‐ferrite‐type NaAlSiO ₄ was observed during shock loading, indicating that the high‐pressure region of the albite Hugoniot is dominated by amorphization. Upon decompression, crystalline peaks reappeared, indicating structural recovery, which may contribute to the wide range of amorphization pressures in the recovery experiments. The absence of decomposition products indicates strong kinetic suppression under nanosecond shock durations, defining the short‐timescale limit of albite decomposition during impact loading. These results refine interpretations of shock metamorphism in plagioclase under planetary impact conditions.
The impact of forearc serpentinization on the composition of subduction-zone fluids revealed by Mg–Fe isotopes in jadeitites Peer-reviewed

Kun Chen, Yi-Xiang Chen, Tatsuki Tsujimori, Hans-Peter Schertl, Xin-Yue Qiao, Jia-Le Xu, Yu-Chen Liu, Naoko Takahashi, Fang Huang, Walter V. Maresch

Geochimica et Cosmochimica Acta　420　76-90　2026/05
Publisher: Elsevier BV
DOI： 10.1016/j.gca.2026.03.021 　

ISSN： 0016-7037
Tungsten(VI) speciation in aqueous fluids at high pressures and high temperatures: in-situ Raman spectroscopy supported by DFT calculations Peer-reviewed

Naoko Takahashi, Michihiko Nakamura, Shigeru Yamashita, Hiroyuki Kagi

Chemical Geology　123411-123411　2026/04
Publisher: Elsevier BV
DOI： 10.1016/j.chemgeo.2026.123411 　

ISSN： 0009-2541
Rutile solubility in aqueous sodium salt solutions at high pressures and temperatures: in situ observations using a diamond anvil cell International-journal Peer-reviewed

Takahashi, Naoko, Tsujimori, Tatsuki, Kamada, Seiji, Nakamura, Michihiko

Progress in Earth and Planetary Science　12　2025/01

DOI： 10.1186/s40645-025-00683-w 　
Experimental constraints on serpentinite carbonation in the presence of a H2O–CO2–NaCl fluid Peer-reviewed

Yongsheng Huang, Satoshi Okumura, Kazuhisa Matsumoto, Naoko Takahashi, Hong Tang, Guoji Wu, Tatsuki Tsujimori, Michihiko Nakamura, Atsushi Okamoto, Yuan Li

Contributions to Mineralogy and Petrology　179　(11)　2024/10/08
Publisher: Springer Science and Business Media LLC
DOI： 10.1007/s00410-024-02175-4 　

ISSN： 0010-7999

eISSN： 1432-0967
High‐pressure and high‐temperature Raman spectroscopic study of zircon as a pressure scale in hydrothermal DACs Peer-reviewed

Naoko Takahashi, Hiroki Kobayashi, Hiroyuki Kagi

Journal of Raman Spectroscopy　55　(6)　706-716　2024/02/26
Publisher: Wiley
DOI： 10.1002/jrs.6663 　

ISSN： 0377-0486

eISSN： 1097-4555

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Abstract Raman spectra of zircon have recently been used as a pressure scale for studies of geological fluids at high temperatures and high pressures using diamond anvil cells (DACs). The zircon scale is advantageous in high chemical stability and the large pressure response of the B_1g mode. Despite its excellent applicability, the calibration of the scale has been carried out only in a narrow pressure–temperature range, especially under limited high‐temperature and high‐pressure conditions. In this study, the pressure and temperature dependence of the Raman modes of synthetic zircon was investigated up to 9.5 GPa and from room temperature to 776 K using an externally heated diamond anvil cell. Ruby and gold were used as the reference pressure scales. The Raman shift of the B_1g mode for the antisymmetric stretching of the SiO₄ structure in zircon showed a linear pressure dependence of 5.48(4) cm⁻¹/GPa up to 8 GPa at room temperature, in agreement with the previous studies. Measurements under high‐pressure and high‐temperature conditions confirmed that the pressure dependence up to 9.5 GPa along the isotherms from 373 to 675 K was consistent with the room‐temperature value; the wavenumbers can be well deduced from the sum of the individual effects of pressure and temperature, obtained at ambient temperature and pressure, respectively. A comparison of the zircon scale with the c‐BN Raman spectroscopic scale confirmed that the pressures determined with these scales were in reasonable agreement. The present results provide a confident use of the zircon Raman spectroscopic scale in a wider pressure–temperature range than previous studies for the internally consistent pressure determination.
In-situ Raman spectroscopic analysis of dissolved silica structures in Na2CO3 and NaOH solutions at high pressure and temperature Peer-reviewed

Takahashi, N., Tsujimori, T., Kamada, S., Nakamura, M.

Contributions to Mineralogy and Petrology　177　(3)　2022/03
Publisher: Springer Science and Business Media {LLC}
DOI： 10.1007/s00410-022-01892-y 　
In-situ lithium isotope geochemistry for a veined jadeitite from the New Idria serpentinite body, California: Constraints on slab-derived fluid and fluid-rock interaction Peer-reviewed

Takahashi, N., Tsujimori, T., Chang, Q., Kimura, J.-I.

Lithos　318-319　2018

DOI： 10.1016/j.lithos.2018.08.015 　
Cathodoluminescence petrography of P-type jadeitites from the New Idria serpentinite body, California Peer-reviewed

Takahashi, N., Tsujimori, T., Kayama, M., Nishido, H.

Journal of Mineralogical and Petrological Sciences　112　(5)　2017

DOI： 10.2465/jmps.170403

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Research Projects 6

Elucidating pulse response in magma crystallization rates: Toward material science-based forecasting of volcanic eruption transitions.

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (A)

Institution: Tohoku University

2026/04/01 - 2030/03/31
深部マグマ上昇におけるCO2の役割:高温高圧実験と深海火山岩試料解析からのアプローチ

高橋菜緒子

Offer Organization: 東北大学

System: 火山研究人材育成等支援事業(即戦力となる火山人材育成プログラム)

2025/06 - 2027/03
高温高圧実験と理論計算による熱水鉱床構成金属元素の溶存状態と濃集機構の解明

高橋菜緒子

Offer Organization: 日本学術振興会

System: 科学研究費助成事業海外特別研究員

2025 - 2027
岩石－水系における臨界現象の実験的・理論的研究

高橋菜緒子

Offer Organization: 日本学術振興会

System: 科学研究費助成事業

Category: 若手研究

2024/04 - 2026/03
圧力スケールの構築に基づいた高温高圧その場分光測定による沈み込み帯流体の構造解明

高橋菜緒子

Offer Organization: 日本学術振興会

System: 科学研究費助成事業

Category: 特別研究員奨励費

Institution: 東京大学

2022/04 - 2025/03
脈として産する高圧鉱物の複数相飽和実験による沈み込み流体組成と移動の解明

高橋菜緒子

Offer Organization: 日本学術振興会

System: 科学研究費助成事業

Category: 特別研究員奨励費

Institution: 東北大学

2019/04 - 2022/03

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2020年度は、天然のプレート境界岩試料の高圧鉱物脈中に異常濃集が観察されるルチル(TiO2)に着目し、様々な化学組成の流体へのルチル溶解度を決定するための外熱式ダイヤモンドアンビルセル(DAC)を用いた高温高圧その場観察実験を行った。本実験に先立ち、試料室の加熱速度の検討を行った。外熱式DACを用いたルチル溶解度測定を行った先行研究と同じ昇温速度10-20℃/分で加熱を行なったところルチルと流体が平衡に達していないことが明らかとなったため、本実験ではルチルが溶解する様子を示してから50℃ごとに温度を15-30分保持し、完全溶解直前には昇温速度を1℃/分以下に下げた。さらに、結晶の体積測定から鉱物溶解度を求める手法を確立し、1 molal炭酸ナトリウム溶液、炭酸水素ナトリウム溶液、硫酸ナトリウム溶液へのルチルの溶解度測定を最大温度圧力条件約950℃、約1.7 GPaまで実施した。その結果、同様の温度圧力条件における純水やアルバイト飽和流体への溶解度よりも一桁～二桁高い溶解度が求められた。この結果は、沈み込み帯深部条件でチタンが炭素や硫黄を含む流体を媒介して移動する可能性があることを示す。結果の一部は、国内学会で口頭発表を行った。また同時に、炭酸ナトリウム水溶液への石英溶解実験を行い、最大温度圧力条件約750℃、約1.5 GPaまで流体のラマンスペクトル測定を行なった。使用する対物レンズの再検討により、十分なSN比のスペクトルを取得し、温度の上昇に伴い積分強度が上昇する架橋酸素の強いバンドを検出した。さらに高温高圧下における炭酸ナトリウム水溶液に対する石英の溶解度は、純水への溶解度よりもはるかに高く、電解質水溶液の熱力学モデルで現在考慮されていないケイ酸塩重合種の存在を明らかにした。これらの成果は、日本地球惑星科学連合2021年大会で口頭発表予定である。

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