Redox state and the evolution of the Earth's deep mantle

• Project/Area Number: 16H06023
• Research Category: Grant-in-Aid for Young Scientists (A)
• Allocation Type: Single-year Grants
• Research Field: Petrology/Mineralogy/Economic geology
• Research Institution: The University of Tokyo (2017-2019); Tokyo Institute of Technology (2016)
• Principal Investigator: Sinmyo Ryosuke 東京大学, 大学院理学系研究科(理学部), 特任准教授 (00769812)
• Project Period (FY): 2016-04-01 – 2020-03-31
• Project Status: Completed (Fiscal Year 2019)
• Budget Amount: ¥23,660,000 (Direct Cost: ¥18,200,000、Indirect Cost: ¥5,460,000); Fiscal Year 2018: ¥5,070,000 (Direct Cost: ¥3,900,000、Indirect Cost: ¥1,170,000); Fiscal Year 2017: ¥8,060,000 (Direct Cost: ¥6,200,000、Indirect Cost: ¥1,860,000); Fiscal Year 2016: ¥7,930,000 (Direct Cost: ¥6,100,000、Indirect Cost: ¥1,830,000)
• Keywords: 下部マントル / 酸化還元状態 / ダイヤモンドアンビルセル / 高温高圧 / 地球内部 / マントル / 地球核 / 高温高圧実験 / 鉄 / 地球・惑星内部構造 / 地殻・マントル物質 / 固体地球物理学 / 岩石・鉱物・鉱床学 / 惑星起源・進化

Outline of Final Research Achievements

The redox state of the Earth's deep interior is important information to understand the evolution of the volatile elements of the Earth. In this study, I have developed a high-pressure and -temperature experimental system to reproduce the Earth's internal conditions. The developed new experimental system, including resistivity-heated diamond anvil cell, can generate very high-pressure and high-temperature with better homogeneity and stability. The results showed that the redox state has a strong effect on the physical and chemical properties, such as the melting point of the Earth's interior.

Academic Significance and Societal Importance of the Research Achievements

酸素は天体物質を普遍的に構成する根源的に重要な元素であるが、地球深部の酸素雰囲気(概ね酸素量に相当)は未だによくわかっていない。地球深部の酸素雰囲気は、遷移金属の酸化数を通しマントルの性質を支配しており、深部マントルの構造やダイナミクスを決定付ける重要なパラメータである。同時に深部酸素雰囲気の変動は、表層環境の酸化還元状態を激変させ、酸素を必要とする全生命の永続性に大きな影響を与えうる。本研究では、地球深部酸化還元状態とその進化を明らかにするために、実験的なアプローチで研究を進めた。得られた成果から、地球深部酸化還元状態と物理・化学特定との、これまで知られていなかった関係が明らかになった。

Research Products

• [Int'l Joint Research] Bayerisches Geoinstitut/Deutsches Elektronen-Synchrotron(Germany)
• [Int'l Joint Research] European Synchrotron Radiation Facility(France)
• [Journal Article] Phase transition boundary between fcc and hcp structures in Fe-Si alloy and its implications for terrestrial planetary cores (2019)
  • Author(s): Komabayashi Tetsuya、Pesce Giacomo、Morard Guillaume、Antonangeli Daniele、Sinmyo Ryosuke、Mezouar Mohamed
  • Journal Title: American Mineralogist Volume: 104 Issue: 1 Pages: 94-99
  • DOI: 10.2138/am-2019-6636
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Melting curve of iron to 290 GPa determined in a resistance-heated diamond-anvil cell (2019)
  • Author(s): Sinmyo Ryosuke、Hirose Kei、Ohishi Yasuo
  • Journal Title: Earth and Planetary Science Letters Volume: 510 Pages: 45-52
  • DOI: 10.1016/j.epsl.2019.01.006
  • Peer Reviewed
• [Journal Article] Phase relations in the system Fe-Ni-Si to 200 GPa and 3900 K and implications for Earth's core (2019)
  • Author(s): Komabayashi Tetsuya、Pesce Giacomo、Sinmyo Ryosuke、Kawazoe Takaaki、Breton Helene、Shimoyama Yuta、Glazyrin Konstantin、Konopkova Zuzana、Mezouar Mohamed
  • Journal Title: Earth and Planetary Science Letters Volume: 512 Pages: 83-88
  • DOI: 10.1016/j.epsl.2019.01.056
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Melting Curve and Equation of State of β‐Fe7N3: Nitrogen in the Core? (2019)
  • Author(s): Kusakabe Mayu、Hirose Kei、Sinmyo Ryosuke、Kuwayama Yasuhiro、Ohishi Yasuo、Helffrich George
  • Journal Title: Journal of Geophysical Research: Solid Earth Volume: 124 Issue: 4 Pages: 3448-3457
  • DOI: 10.1029/2018jb015823
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Melting experiments on the Fe?C binary system up to 255 GPa: Constraints on the carbon content in the Earth's core (2019)
  • Author(s): Mashino Izumi、Miozzi Francesca、Hirose Kei、Morard Guillaume、Sinmyo Ryosuke
  • Journal Title: Earth and Planetary Science Letters Volume: 515 Pages: 135-144
  • DOI: 10.1016/j.epsl.2019.03.020
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Melting experiments on liquidus phase relations in the Fe-S-O ternary system under core pressures (2019)
  • Author(s): Shunpei Yokoo、Hirose Kei、Sinmyo Ryosuke
  • Journal Title: Geophysical Research Letters Volume: 印刷中
  • NAID: 120006889028
  • Peer Reviewed
• [Journal Article] 内部抵抗加熱式ダイヤモンドアンビルセルを用いた鉄融点の決定 (2019)
  • Author(s): 新名良介、廣瀬敬、大石泰生
  • Journal Title: 高圧力の科学と技術 Volume: 印刷中
  • NAID: 130007680178
  • Peer Reviewed
• [Journal Article] 高温高圧実験を用いたマントル深部鉱物の物理・化学的性質の研究 (2019)
  • Author(s): 新名良介
  • Journal Title: 岩石鉱物科学 Volume: 48 Pages: 36-45
  • NAID: 130007626273
• [Journal Article] Experimental Determination of Eutectic Liquid Compositions in the MgO-SiO2 System to the Lowermost Mantle Pressures (2018)
  • Author(s): Ozawa Keisuke、Anzai Miyuki、Hirose Kei、Sinmyo Ryosuke、Tateno Shigehiko
  • Journal Title: Geophysical Research Letters Volume: 45 Issue: 18 Pages: 9552-9558
  • DOI: 10.1029/2018gl079313
  • Peer Reviewed
• [Journal Article] Melting experiments on Fe-Si-S alloys to core pressures: Silicon in the core? (2018)
  • Author(s): Tateno Shigehiko、Hirose Kei、Sinmyo Ryosuke、Morard Guillaume、Hirao Naohisa、Ohishi Yasuo
  • Journal Title: American Mineralogist Volume: 印刷中
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Melting experiments on Fe-Fe 3 S system to 254 GPa (2017)
  • Author(s): Mori Yuko、Ozawa Haruka、Hirose Kei、Sinmyo Ryosuke、Tateno Shigehiko、Morard Guillaume、Ohishi Yasuo
  • Journal Title: Earth and Planetary Science Letters Volume: 464 Pages: 135-141
  • DOI: 10.1016/j.epsl.2017.02.021
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Critical behavior of Mg1-xFexO at the pressure-induced iron spin-state crossover (2017)
  • Author(s): Glazyrin Konstantin、Sinmyo Ryosuke、Bykova Elena、Bykov Maxim、Cerantola Valerio、Longo Micaela、McCammon Catherine、Prakapenka Vitali、Dubrovinsky Leonid
  • Journal Title: Physical Review B Volume: 95 Issue: 21 Pages: 214412-214412
  • DOI: 10.1103/physrevb.95.214412
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] The spin state of Fe3+ in lower mantle bridgmanite (2017)
  • Author(s): Sinmyo R., McCammon C., Dubrovinsky L.
  • Journal Title: Am. Mineral. Volume: 印刷中 Issue: 6 Pages: 1263-1269
  • DOI: 10.2138/am-2017-5917
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Synthesis and crystal structure of LiNbO3-type Mg3Al2Si3O12: A possible indicator of shock conditions of meteorites (2017)
  • Author(s): Ishii Takayuki、Sinmyo Ryosuke、Komabayashi Tetsuya、Ballaran Tiziana Boffa、Kawazoe Takaaki、Miyajima Nobuyoshi、Hirose Kei、Katsura Tomoo
  • Journal Title: American Mineralogist Volume: 102 Issue: 9 Pages: 1947-1952
  • DOI: 10.2138/am-2017-6027
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] The effect of iron and aluminum incorporation on lattice thermal conductivity of bridgmanite at the Earth's lower mantle (2017)
  • Author(s): Okuda Yoshiyuki、Ohta Kenji、Yagi Takashi、Sinmyo Ryosuke、Wakamatsu Tatsuya、Hirose Kei、Ohishi Yasuo
  • Journal Title: Earth and Planetary Science Letters Volume: 474 Pages: 25-31
  • DOI: 10.1016/j.epsl.2017.06.022
  • Peer Reviewed
• [Journal Article] Perovskite in Earth’s deep interior (2017)
  • Author(s): Hirose Kei、Sinmyo Ryosuke、Hernlund John
  • Journal Title: Science Volume: 358 Issue: 6364 Pages: 734-738
  • DOI: 10.1126/science.aam8561
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Sound velocities of skiagite-iron-majorite solid solution to 56 GPa probed by nuclear inelastic scattering (2017)
  • Author(s): Vasiukov Denis、Ismailova Leyla、Kupenko Ilya、Cerantola Valerio、Sinmyo Ryosuke、Glazyrin Konstantin、McCammon Catherine、Chumakov Aleksandr、Dubrovinsky Leonid、Dubrovinskaia Natalia
  • Journal Title: Physics and Chemistry of Minerals Volume: － Issue: 5 Pages: 397-404
  • DOI: 10.1007/s00269-017-0928-8
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Electrical conductivity of NaCl-bearing aqueous fluids to 600 ℃ and 1 GPa (2017)
  • Author(s): Sinmyo R., Keppler H.
  • Journal Title: Contributions to Mineralogy and Petrology Volume: 172 Issue: 1
  • DOI: 10.1007/s00410-016-1323-z
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] SiO2 crystallization and compositional evolution of the Earth’s core (2017)
  • Author(s): K. Hirose, G. Morard, R. Sinmyo, K. Umemoto, J. Hernlund, G. Helffrich, and S. Labrosse
  • Journal Title: Nature Volume: 543 Issue: 7643 Pages: 99-102
  • DOI: 10.1038/nature21367
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Sound velocities of bridgmanite from density of states determined by nuclear inelastic scattering and first principles calculations (2016)
  • Author(s): McCammon C., Caracas R., Glazyrin K., Potapkin V., Kantor A., Sinmyo R., Prescher C., Kupenko I., Chumakov A., Dubrovinsky L.
  • Journal Title: Progress in Earth and Planetary Science Volume: 3 Issue: 1
  • DOI: 10.1186/s40645-016-0089-2
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Stability of Fe,Al-bearing bridgmanite in the lower mantle and synthesis of pure Fe-bridgmanite (2016)
  • Author(s): Ismailova L., Bykova E., Bykov M., Cerantola V., McCammon C., Boffa Balaran T., Bobrov A., Sinmyo R., Dubrovinskaia N., Glazyrin K., Liermann H.-P., Kupenko I., Hanfland M., Prescher C., Prakapenka V., Svitlyk V., Dubrovinsky L.
  • Journal Title: Science Advances Volume: 2 Issue: 7
  • DOI: 10.1126/sciadv.1600427
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Discovery of Fe7O9: a new iron oxide with a complex monoclinic structure (2016)
  • Author(s): Sinmyo R., Bykova E., Ovsyannikov S.V., McCammon C., Kupenko I., Ismailova L., Dubrovinsky L.
  • Journal Title: Scientific Reports Volume: 6 Issue: 1
  • DOI: 10.1038/srep32852
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Presentation] Technical development toward understanding the melting temperature of the materials at high pressure using ultra-fast spectroradiometry (2019)
  • Author(s): Ryosuke Sinmyo
  • Organizer: Interaction and Coevolution of the Core and Mantle International Symposium Annual General Meeting
  • Int'l Joint Research
• [Presentation] Crystallization of Liquid Fe-S-O at ICB Conditions (2018)
  • Author(s): Shunpei Yokoo, Kei Hirose and Ryosuke Sinmyo
  • Organizer: AGU Fall Meeting 2018
  • Int'l Joint Research
• [Presentation] Stability of Fe5O6 at High Pressure and Temperature (2018)
  • Author(s): Koutaro Hikosaka, Ryosuke Sinmyo, Kei Hirose, Takayuki Ishii and Yasuo Ohishi
  • Organizer: AGU Fall Meeting 2018
  • Int'l Joint Research
• [Presentation] Melting experiments on the Fe-C binary system up to 255 GPa: Constraints on the carbon content in the Earth’s core (2018)
  • Author(s): Izumi Mashino, Francesca Miozzi, Kei Hirose, Guillaume Morard and Ryosuke Sinmyo
  • Organizer: AGU Fall Meeting 2018
  • Int'l Joint Research
• [Presentation] Internally resistive heated diamond anvil cell experiments on Fe-Ni-Si alloy to 200 GPa and 3900 K and its implications for Earth's core (2018)
  • Author(s): Tetsuya Komabayashi, Giacomo Pesce, Ryosuke Sinmyo, Takaaki Kawazoe, Helene Breton, Yuta Shimoyama, Konstantin Glazyrin, Zuzana Konopkova and Mohamed Mezouar
  • Organizer: AGU Fall Meeting 2018
  • Int'l Joint Research
• [Presentation] Experimental Determination of Eutectic Liquid Compositions in the MgO-SiO2 System to the Lowermost Mantle Pressures (2018)
  • Author(s): Keisuke Ozawa, Miyuki Anzai, Kei Hirose, Ryosuke Sinmyo and Shigehiko Tateno
  • Organizer: AGU Fall Meeting 2018
  • Int'l Joint Research
• [Presentation] Melting curve of iron to 290 GPa determined in a resistance-heated diamond-anvil cell: implications for the Earth and planetary core (2018)
  • Author(s): Ryosuke Sinmyo, Kei Hirose and Yasuo Ohishi
  • Organizer: AGU Fall Meeting 2018
  • Int'l Joint Research
• [Presentation] 内部抵抗加熱式ダイヤモンドアンビルセルを用いた290GPaまでの鉄の融点決定 (2018)
  • Author(s): 新名良介、廣瀬敬、大石泰生
  • Organizer: SPring-8シンポジウム2018サテライト研究会
  • Invited
• [Presentation] 高温高圧実験から探る地球核とマントル最下部の温度構造 (2018)
  • Author(s): 新名良介、廣瀬敬、大石泰生
  • Organizer: 日本地球化学会年会
  • Invited
• [Presentation] 高温高圧実験を用いたマントル深部鉱物の物理・化学的性質の研究 (2018)
  • Author(s): 新名良介
  • Organizer: 日本鉱物科学会2018年会
  • Invited
• [Presentation] Effect of Fe3+ on the subsolidus and melting phase relations under lower mantle conditions (2017)
  • Author(s): Ryosuke Sinmyo, Yoichi Nakajima, Catherine McCammon, Nobuyoshi Miyajima, Sylvain Petitgirard, Robert Myhill, Daniel Frost
  • Organizer: Goldschmidt Conference 2017
  • Int'l Joint Research
• [Presentation] 下部マントル条件においてFe3+がサブソリダスおよび融解相関係に与える影響 (2017)
  • Author(s): 新名良介, 中島陽一, Catherine McCammon, 宮島延吉, Sylvain Petitgirard, Robert Myhill, Daniel Frost
  • Organizer: 日本鉱物科学会2017年年会
• [Presentation] Melting of Iron at High Pressure (2017)
  • Author(s): 新名良介，廣瀬敬, 大石泰生
  • Organizer: 第58回高圧討論会
• [Presentation] Melting of Iron to 290 Gigapascals (2017)
  • Author(s): Ryosuke Sinmyo, Kei Hirose, Yasuo Ohishi
  • Organizer: 2017 American Geophysical Union Fall meeting
  • Int'l Joint Research
• [Presentation] Electrical conductivity of H2O-NaCl fluids to 10 kbar (2016)
  • Author(s): Sinmyo R. and Keppler H.
  • Organizer: American Geophysical Union Fall Meeting 2016
  • Place of Presentation: Moscone Center, San Francisco, USA
  • Year and Date: 2016-12-12
  • Int'l Joint Research
• [Presentation] Electrical conductivity of NaCl-bearing aqueous fluids to 600 ℃ and 1 GPa (2016)
  • Author(s): Sinmyo R. and Keppler H.
  • Organizer: 第57回高圧討論会
  • Place of Presentation: 筑波大学大学会館、茨城、日本
  • Year and Date: 2016-10-26
• [Presentation] The spin state of Fe3+ in lower mantle bridgmanite (2016)
  • Author(s): Sinmyo R., McCammon C., Dubrovinsky L.
  • Organizer: Goldschmidt Conference 2016
  • Place of Presentation: パシフィコ横浜、横浜、日本
  • Year and Date: 2016-06-27
  • Int'l Joint Research
• [Presentation] Electrical conductivity of H2O-NaCl fluids to 10 kbar (2016)
  • Author(s): Sinmyo R. and Keppler H.
  • Organizer: Fifteenth International Symposium on Experimental Mineralogy, Petrology and Geochemistry
  • Place of Presentation: ETH Zurich, Switzerland
  • Year and Date: 2016-06-05
  • Int'l Joint Research
• [Remarks]
  • URL: http://www.elsi.jp/ja/research/member/researcher/lab-manager/ryosuke-sinmyo.html