Determination of sound velocity - density and melting relation of iron-alloys under high pressure and high temperature conditions

• Project/Area Number: 25800292
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Petrology/Mineralogy/Economic geology
• Research Institution: Tohoku University
• Principal Investigator: Sakamaki Tatsuya 東北大学, 理学(系)研究科(研究院), 助教 (30630769)
• Project Period (FY): 2013-04-01 – 2016-03-31
• Project Status: Completed (Fiscal Year 2015)
• Budget Amount: ¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000); Fiscal Year 2015: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000); Fiscal Year 2014: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000); Fiscal Year 2013: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
• Keywords: 地球科学 / 高圧 / 高温 / 鉄 / 地球核 / 内核 / 音速 / 密度 / 融点

Outline of Final Research Achievements

Hexagonal close-packed iron (hcp-Fe) is a main component of Earth's inner core. The difference in density between hcp-Fe and the inner core in the Preliminary Reference Earth Model (PREM) shows a density deficit, which implies an existence of light elements in the core. Sound velocities then provide an important constraint on the amount and kind of light elements in the core.
This study shows the compressional sound velocity (Vp) of hcp-Fe up to 163 GPa and 3000 K using inelastic x-ray scattering from a laser-heated sample in a diamond anvil cell. The result indicates that Earth's inner core has a 4 to 5% smaller density and a 4 to 10% smaller Vp than hcp-Fe. This demonstrates that components other than Fe in Earth’s core are required to explain Earth's core density and velocity deficits compared to hcp-Fe. Hydrogen is a good candidate; thus, Earth's core may be a hidden hydrogen reservoir. In addition, silicon and sulfur are also possible candidates.

Research Products

• [Journal Article] Constraints on Earth's inner core composition inferred from measurements of the sound velocity of hcp-iron in extreme conditions (2016)
  • Author(s): T. Sakamaki, E. Ohtani, H. Fukui, S. Kamada, S. Takahashi, T. Sakairi, A. Takahata, T. Sakai, S. Tsutsui, D. Ishikawa, R. Shiraishi, Y. Seto, T. Tsuchiya, and A. Q. R. Baron
  • Journal Title: Science Advances Volume: 2 Issue: 2 Pages: 2-2
  • DOI: 10.1126/sciadv.1500802
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Magma in the Earth's Interior (2015)
  • Author(s): T. Sakamaki
  • Journal Title: The Review of High Pressure Science and Technology Volume: 25 Issue: 2 Pages: 165-171
  • DOI: 10.4131/jshpreview.25.165
  • NAID: 130005075759
  • ISSN: 0917-639X, 1348-1940
  • Peer Reviewed / Open Access
• [Journal Article] Sound velocity of iron alloys at the extreme pressures and temperatures, and implications for sound velocity anomalies at the inner core boundary (2015)
  • Author(s): E. Ohtani, T. Sakamaki, H. Fukui, S. Kamada
  • Journal Title: SPring-8 Experimental Summary Report Volume: 1 Pages: 1-1
• [Journal Article] Density and sound velocity measurements of liquid Fe-alloys up to 10 GPa using X-ray imaging absorption and ultrasonic methods (2015)
  • Author(s): H. Terasaki, Y. Shimoyama, F. Kurokawa, K. Nishida, Y. Shibasaki, T. Sakamaki, S. Urakawa, Y. Higo, Y. Tange
  • Journal Title: SPring-8 Experimental Summary Report Volume: 1 Pages: 1-1
• [Journal Article] Study of physical properties of the core and lower mantle materials using synchrotron Mössbauer and X-ray diffraction method (2015)
  • Author(s): E. Ohtani, T. Sakamaki, S. Kamada, N. Suzuki, M. Hamada, F. Maeda, T. Sakairi
  • Journal Title: SPring-8 Experimental Summary Report Volume: 1 Pages: 1-1
• [Journal Article] Inelastic X-ray scattering experiment of iron-alloy under Earth’s core condition, and constraining the composition of Earth’s inner core (2015)
  • Author(s): T. Sakamaki, E. Ohtani, H. Fukui, S. Kamada, T. Sakairi, A. Q. R. Baron
  • Journal Title: SPring-8 Experimental Summary Report Volume: 1 Pages: 1-1
• [Journal Article] Sound velocity of hcp-iron alloy at very high temperature and high pressure, and implications for sound velocity anomalies at the inner core voundary (2015)
  • Author(s): E. Ohtani, T. Sakamaki, H. Fukui, S. Kamada, T. Sakairi, F. Maeda, H. Terasaki
  • Journal Title: SPring-8 Experimental Summary Report Volume: 1 Pages: 1-1
• [Journal Article] Sound velocity measurement by inelastic X-ray scattering at high pressure and temperature by Resistive heating diamond anvil cell (2015)
  • Author(s): Ohtani, E., K. Mibe, T. Sakamaki, S. Kamada, S. Takahashi, H. Fukui, S. Tsutsui, A.Q.R. Baron
  • Journal Title: Russian Geology and Geophysics Volume: 56 Issue: 1-2 Pages: 203-208
  • DOI: 10.1016/j.rgg.2015.01.012
  • Peer Reviewed
• [Journal Article] Contrasting sound velocity and intermediate-range structural order between polymerized and depolymerized silicate glasses under pressure (2014)
  • Author(s): T. Sakamaki, Y. Kono, Y. Wang, C. Park, T. Yu, Z. Jing, G. Shen
  • Journal Title: Earth and Planetary Science Letters Volume: 391 Pages: 288-295
  • DOI: 10.1016/j.epsl.2014.02.008
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] Velocity of Fe-S liquids at high pressure: Implications for the Moon’s molten outer core (2014)
  • Author(s): Z. Jing, Y. Wang, Y. Kono, T. Yu, T. Sakamaki, C. Park, M. L. Rivers, S. R. Sutton, G. Shen
  • Journal Title: Earth and Planetary Science Letters Volume: 396 Pages: 78-87
  • DOI: 10.1016/j.epsl.2014.04.015
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] The abundance of potassium in the Earth's core (2014)
  • Author(s): Watanabe, K., E. Ohtani, S. Kamada, T. Sakamaki, M. Miyahara, Y. Ito
  • Journal Title: Physics of the Earth and Planetary Interiors Volume: 237 Pages: 65-72
  • DOI: 10.1016/j.pepi.2014.10.001
  • Peer Reviewed
• [Journal Article] Stability of hydrous phase H MgSiO4H2 under lower mantle conditions (2014)
  • Author(s): Ohtani, E., Y. Amaike, S. Kamada, T. Sakamaki, and N. Hirao.
  • Journal Title: Geophysical Research Letters Volume: 41 Issue: 23 Pages: 8283-8287
  • DOI: 10.1002/2014gl061690
  • Peer Reviewed
• [Journal Article] A magma “traffic jam” between lithosphere and asthenosphere (2014)
  • Author(s): T. Sakamaki
  • Journal Title: SPring-8 Research Frontiers 2013 Volume: 1 Pages: 86-87
• [Journal Article] Study of temperature and pressure dependences of sound velocities for solid iron and iron alloy using an ultrasonic method (2014)
  • Author(s): Y. Shibazaki, M. Tahara, M. Igarashi, T. Sakamaki
  • Journal Title: Experimental Summary Report (2014A1472) Volume: 1 Pages: 1-1
• [Journal Article] Study of physical properties of the core and lower mantle materials using synchrotron Mossbauer and X-ray diffraction method (2014)
  • Author(s): E. Ohtani, T. Sakamaki, S. Kamada, S. Takahashi, T. Sakairi, Y. Amaike, F. Maeda, N. Suzuki
  • Journal Title: SPring-8 Experimental Summary Report (2014A0104) Volume: 1 Pages: 1-1
• [Journal Article] Souund velocity measurement of Fe-Ni, Fe-(Si, S) alloys at high pressure and temperature using external heating diamond anvil cell (2014)
  • Author(s): E. Ohtani, T. Sakamaki, H. Fukui, S. Kamada, S. Takahashi, T. Sakairi, A. Takahata
  • Journal Title: SPring-8 Experimental Summary Report (2014A1100) Volume: 1 Pages: 1-1
• [Journal Article] Sound velocity of iron alloys under the extreme pressure and temperature conditions, and sound velocity anormalies in the core (2014)
  • Author(s): E. Ohtani, T. Sakamaki, H. Fukui, S. Kamada, S. Takahashi, T. Sakairi, A. Takahata
  • Journal Title: SPring-8 Experimental Summary Report (2014B1465) Volume: 1 Pages: 1-1
• [Journal Article] Inelastic X-ray scattering experiment of iron alloy under extreme conditions, and determination of the Earth’s inner core composition (2014)
  • Author(s): T. Sakamaki, E. Ohtani, H. Fukui, S. Kamada, T. Sakairi, A. Takahata
  • Journal Title: SPring-8 Experimental Summary Report (2014B1269) Volume: 1 Pages: 1-1
• [Journal Article] Study of physical properties of the core and lower mantle materials using synchrotron Mossbauer and X-ray diffraction method (2014)
  • Author(s): E. Ohtani, S. Kamada, S. Takahashi, T. Sakairi, F. Maeda, N. Suzuki, S. Ozawa, T. Sakamaki
  • Journal Title: SPring-8 Experimental Summary Report (2014B0104) Volume: 1 Pages: 1-1
• [Journal Article] An Atomistic insight into viscosity and density of silicate melts under pressure (2014)
  • Author(s): 4) Y. Wang, T. Sakamaki, L. Skinner, Z. Jing, T. Yu, Y. Kono, C. Park, G. Shen, M. L. Rivers, S. R. Sutton
  • Journal Title: Nature Communications Volume: 5:3241 Issue: 1 Pages: 1-10
  • DOI: 10.1038/ncomms4241
  • Peer Reviewed
• [Journal Article] Contrasting behavior of intermediate-range order structures in jadeite glass and melt (2014)
  • Author(s): 6) T. Sakamaki, Y. Wang, C. Park, T. Yu, G. Shen
  • Journal Title: Physics of the Earth and Planetary Interiors Volume: 228 Pages: 281-286
  • DOI: 10.1016/j.pepi.2014.01.008
  • Peer Reviewed
• [Journal Article] Ponded melt at the boundary between the lighosphere and asthenosphere. (2013)
  • Author(s): Sakamaki T., Suzuki A., Ohtani E., Terasaki H., Urakawa S., Kataynma Y., Funakoshi K., Wang Y., Hernlund J. W., Ballmer M. D.
  • Journal Title: Nature Geoscience Volume: 6 Issue: 12 Pages: 1041-1044
  • DOI: 10.1038/ngeo1982
  • Peer Reviewed
• [Journal Article] A compact system for generating extreme pressures and temperatures : An application of laser-heated diamond anvil cell to inelastic X-ray scattering. (2013)
  • Author(s): Fukui H., Sakai T., Sakamaki T., Kamada S., Takahashi S., Ohtani E., Baron AQR.
  • Journal Title: Review of scientific lnstruments Volume: 84 Issue: 11 Pages: 113902-113902
  • DOI: 10.1063/1.4826497
  • Peer Reviewed
• [Journal Article] Sound velocity of hexagonal close-packed iron up to core pressures (2013)
  • Author(s): Ohtani, E., Y. Shibazaki, T. Sakai, K. Mibe, H. Fukui, S. Kamada, T. Sakamaki, Y. Seto, S. Tsutsui, and A. Q. R. Baron
  • Journal Title: Geophysical Research Letters Volume: 40 Issue: 19 Pages: 1-6
  • DOI: 10.1002/grl.50992
  • Peer Reviewed
• [Journal Article] Sound velocity measurement of iron at high pressure and temperature by combining inelastic X-ray scattering and double-sided laser heating diamond anvil cell, and its implications for the Earth’s inner core (2013)
  • Author(s): T. Sakamaki, E. Ohtani, H. Fukui, S. Kamada, S. Takahashi, T. Sakairi, A. Takahata
  • Journal Title: SPring-8 Experimental Summary Report (2013A1377) Volume: 2013A Pages: 1-1
• [Journal Article] Study about silicate minerals in the subducting slab under lower mantle conditions (2013)
  • Author(s): T. Sakamaki, E. Ohtani, S. Kamada, M. Hamada, S. Takahashi, T. Sakairi, A. Takahata
  • Journal Title: SPring-8 Experimental Summary Report (2013A1380) Volume: 2013A Pages: 1-1
• [Journal Article] Sound velocity measurement of iron alloys at ultrahigh pressure and temperature by combining inelastic X-ray scattering and external heating diamond anvil cell (2013)
  • Author(s): E. Ohtani, T. Sakamaki, H. Fukui, S. Kamada, S. Takahashi, T. Sakairi, A. Takahata
  • Journal Title: SPring-8 Experimental Summary Report (2013A1492) Volume: 2013A Pages: 1-1
• [Journal Article] Spin transition, magnetic transition and structural change of mantle and core constituent minerals under high pressure (2013)
  • Author(s): E. Ohtani, T. Sakamaki, S. Kamada, M. Hamada, N. Nishitani, T. Sakairi
  • Journal Title: SPring-8 Experimental Summary Report (2013A1496) Volume: 2013A Pages: 1-1
• [Journal Article] Study on valence and spin states of iron in mantle minerals and core materials at high pressure using synchrotron X-ray Mossbauer spectroscopy (2013)
  • Author(s): E. Ohtani, M. Hamada, T. Sakamaki, S. Kamada, N. Nishitani, I. Mashino, T. Mitsui
  • Journal Title: SPring-8 Experimental Summary Report (2013A3513) Volume: 2013A Pages: 1-1
• [Journal Article] Simultaneous sound velocity and density measurement of the Earth’s core material under high pressure and temperature condition using inelastic X-ray scattering (2013)
  • Author(s): T. Sakamaki, E. Ohtani, H. Fukui, S. Kamada, A. Takahata
  • Journal Title: SPring-8 Experimental Summary Report (2013B1078) Volume: 2013B Pages: 1-1
• [Journal Article] Study of physical properties of the core and lower mantle materials using synchorton Mossbauer and X-ray diffraction method (2013)
  • Author(s): E. Ohtani, T. Sakamaki, S. Kamada, A. Takahata, N. Suzuki, Y. Amaike, F. Maeda, S. Takahashi
  • Journal Title: SPring-8 Experimental Summary Report (2013B0104) Volume: 2013B Pages: 1-1
• [Journal Article] Sound velocity measurement of iron alloys at high pressure and temperature by inelastic X-ray scattering and external heating diamond anvil cell (2013)
  • Author(s): E. Ohtani, H. Fukui, T. Sakamaki, S. Kamada, K. Mibe, A. Takahata
  • Journal Title: SPring-8 Experimental Summary Report (2013B1094) Volume: 2013B Pages: 1-1
• [Presentation] Pressure-induced change of iron electronic environment in basaltic glass (2016)
  • Author(s): F. Maeda, S. Kamada, E. Ohtani, N. Suzuki, T. Sakamaki, N. Hirao, T. Mitsui, R. Masuda, S. Nakano
  • Organizer: 13th International Workshop on WATER DYNAMICS
  • Place of Presentation: 東北大学（仙台）
  • Year and Date: 2016-03-15
  • Int'l Joint Research
• [Presentation] Melting relation in the Fe-S-Si system under the condition of Mercury’s core (2016)
  • Author(s): H. Tobe, A. Suzuki, Y. Shibazaki, T. Sakamaki, E. Ohtani
  • Organizer: 13th International Workshop on WATER DYNAMICS
  • Place of Presentation: 東北大学（仙台）
  • Year and Date: 2016-03-15
  • Int'l Joint Research
• [Presentation] Partition experiment between solid and liquid metal in the Fe-Ni-O-S-Si system (2016)
  • Author(s): R. Tanaka, E. Ohtani, S. Kamada, T. Sakamaki, S. Ozawa
  • Organizer: 13th International Workshop on WATER DYNAMICS
  • Place of Presentation: 東北大学（仙台）
  • Year and Date: 2016-03-15
  • Int'l Joint Research
• [Presentation] Metal partitioning in ultra-high temperature and high pressure conditions (2016)
  • Author(s): S. Sato, E. Ohtani, S. Kamada, S. Ozawa, T. Sakamaki
  • Organizer: 13th International Workshop on WATER DYNAMICS
  • Place of Presentation: 東北大学（仙台）
  • Year and Date: 2016-03-15
  • Int'l Joint Research
• [Presentation] Core formation process and light elements in the planetary core (2015)
  • Author(s): E. Ohtani, T. Sakairi, K. Watanabe, S. Kamada, T. Sakamaki, N. Hirao
  • Organizer: AGU Fall Meeting 2015
  • Place of Presentation: サンフランシスコ（アメリカ）
  • Year and Date: 2015-12-14
  • Int'l Joint Research
• [Presentation] In-situ density and thermal expansion measurements of Fe and Fe-S alloying liquids under planetary core condition (2015)
  • Author(s): Z. Jing, J. Chantel, T. Yu, T. Sakamaki, Y. Wang
  • Organizer: AGU Fall Meeting 2015
  • Place of Presentation: サンフランシスコ（アメリカ）
  • Year and Date: 2015-12-14
  • Int'l Joint Research
• [Presentation] 高温高圧下での非弾性X 線散乱による鉄-ニッケル合金の音速測定 (2015)
  • Author(s): 坂巻竜也、大谷栄治、福井宏之、鎌田誠司、坂入崇紀、筒井智嗣、アルフレッド・バロン
  • Organizer: 第56回高圧討論会
  • Place of Presentation: JMSアステールプラザ（広島）
  • Year and Date: 2015-11-10
• [Presentation] 下部マントル条件下における玄武岩質ガラスの放射光メスバウアー分光測定 (2015)
  • Author(s): 前田郁也、大谷栄治、鎌田誠司、坂巻竜也、鈴木那奈美、平尾直久、大石泰生、三井隆也、増田亮、中野 智志
  • Organizer: 第56回高圧討論会
  • Place of Presentation: JMSアステールプラザ（広島）
  • Year and Date: 2015-11-10
• [Presentation] 超音波法を用いた高温高圧下での固体鉄の弾性波速度・密度測定 (2015)
  • Author(s): 柴崎裕樹、西田圭佑、肥後祐司、五十嵐愛子、田原政紀、坂巻竜也、寺崎英紀、下山裕太、田窪勇作、桑原壮馬、大谷 栄治
  • Organizer: 第56回高圧討論会
  • Place of Presentation: JMSアステールプラザ（広島）
  • Year and Date: 2015-11-10
• [Presentation] 核の形成過程と核の軽元素 (2015)
  • Author(s): 大谷栄治、渡邉虹水、坂入崇紀、鎌田誠司、坂巻竜也、平尾直久、大石泰生
  • Organizer: 日本鉱物科学会2015年年会
  • Place of Presentation: 東京大学（東京）
  • Year and Date: 2015-09-25
• [Presentation] 超高温高圧下における鉄合金の音速測定 (2015)
  • Author(s): 坂巻竜也
  • Organizer: 地球惑星科学研究会、高圧物質科学研究会、機能性材料ナノスケール原子相関研究会合同研究会
  • Place of Presentation: 九州大学（福岡）
  • Year and Date: 2015-09-12
  • Invited
• [Presentation] Development of sound velocity and density measurement for liquid Fe-alloys using multi-anvil apparatus up to 11 GPa (2015)
  • Author(s): H. Terasaki, Y. Shimoyama, Y. Takubo, S. Kuwabara, K. Nishida, Y. Higo, S. Urakawa, S. Kishimoto, Y. Shibazaki, T. Sakamaki, M. Tahara, M. Igarashi, T. Wataniki, A. Machida, Y. Tange, Y. Katayama, T. Kondo
  • Organizer: Joint AIRAPT-25 & EHPRG-53 Conference
  • Place of Presentation: マドリッド（スペイン）
  • Year and Date: 2015-08-30
  • Int'l Joint Research
• [Presentation] Electronic environment of iron in basaltic glass at high pressure (2015)
  • Author(s): F. Maeda, E. Ohtani, S. Kamada, T. Sakamaki, N. Suzuki, N. Hirao, Y. Ohishi, T. Mitsui, R. Masuda
  • Organizer: Advances in High Pressure Reserch II: Deepest Understanding
  • Place of Presentation: ノボシビルスク（ロシア）
  • Year and Date: 2015-08-29
  • Int'l Joint Research
• [Presentation] Contrasting viscosity and structure between anorthite and albite melts (2015)
  • Author(s): T. Sakamaki, Y. Kono
  • Organizer: Goldshmidt2015
  • Place of Presentation: プラハ（チェコ）
  • Year and Date: 2015-08-16
  • Int'l Joint Research
• [Presentation] Sound velocity of iron alloys and composition of the core (2015)
  • Author(s): E. Ohtani, T. Sakamaki, S. Kamada, Y. Shibazaki, S. Takahashi, H. Fukui, S. Tsutsui, A. Q. Baron
  • Organizer: Goldshmidt2015
  • Place of Presentation: プラハ（チェコ）
  • Year and Date: 2015-08-16
  • Int'l Joint Research
• [Presentation] Viscosity and structure of anorthite melt under high pressure and high temperature conditions (2015)
  • Author(s): T. Sakamaki, Y. Kono
  • Organizer: Japan Geoscience Union Meeting 2015
  • Place of Presentation: 幕張メッセ（千葉）
  • Year and Date: 2015-05-24
  • Int'l Joint Research
• [Presentation] Spin state of iron in MORB glass up to the lowermost mantle conditions (2015)
  • Author(s): F. Maeda, E. Ohtani, S. Kamada, N. Suzuki, T. Sakamaki, N. Hirao, Y. Ohishi, T. Mitsui, R. Masuda
  • Organizer: Japan Geoscience Union Meeting 2015
  • Place of Presentation: 幕張メッセ（千葉）
  • Year and Date: 2015-05-24
  • Int'l Joint Research
• [Presentation] Melting relationships in the Fe-S-Si system at high pressure and temperature (2015)
  • Author(s): T. Sakairi, E. Ohtani, T. Sakai, S. Kamada, T. Sakamaki, N. Hirao
  • Organizer: Japan Geoscience Union Meeting 2015
  • Place of Presentation: 幕張メッセ（千葉）
  • Year and Date: 2015-05-24
  • Int'l Joint Research
• [Presentation] The effect of Ni and C on sound velocity of liquid Fe at high pressure (2015)
  • Author(s): S. Kuwabara, H. Terasaki, Y. Shimoyama, K. Nishida, Y. Higo, Y. Takubo, Y. Shibazaki, M. Tahara, M. Igarashi, T. Sakamaki, Y. Tange, T. Kondo
  • Organizer: Japan Geoscience Union Meeting 2015
  • Place of Presentation: 幕張メッセ（千葉）
  • Year and Date: 2015-05-24
  • Int'l Joint Research
• [Presentation] Sound velocity measurements of solid iron under high pressure and high temperature using an ultrasonic method (2015)
  • Author(s): Y. Shibazaki, K. Nishida, Y. Higo, M. Igarashi, M. Tahara, T. Sakamaki, H. Terasaki, Y. Shimoyama, S. Kuwabara, Y. Takubo, E. Ohtani
  • Organizer: Japan Geoscience Union Meeting 2015
  • Place of Presentation: 幕張メッセ（千葉）
  • Year and Date: 2015-05-24
  • Int'l Joint Research
• [Presentation] Sound velocity of Fe3C at high pressure and high temperature: Implications for the density and sound velocity profiles of the Earth’s inner core (2015)
  • Author(s): S. Takahashi, E. Ohtani, T. Sakamaki, H. Fukui, T. Sakairi, A. Takahata, S. Tsutsui, A. Q. R. Baron
  • Organizer: 12th International on Water Dynamics
  • Place of Presentation: 仙台
  • Year and Date: 2015-03-09 – 2015-03-12
• [Presentation] The formation of super-deep diamonds in the subducting MgCO3-SiO2 system into the lower mantle (2015)
  • Author(s): F. Maeda, E. Ohtani, S. Kamada, T. Sakamaki, N. Hirao, Y. Ohishi
  • Organizer: 12th International on Water Dynamics
  • Place of Presentation: 仙台
  • Year and Date: 2015-03-09 – 2015-03-12
• [Presentation] 高温高圧実験で探る地球深部由来のダイヤモンドの成因 (2015)
  • Author(s): 前田郁也、大谷栄治、鎌田誠司、坂巻竜也、平尾直久、大石泰生
  • Organizer: 第8回6専攻シンポジウム「ヤングブレインズの連携による学際的研究の開拓」
  • Place of Presentation: 仙台
  • Year and Date: 2015-02-20
• [Presentation] Sound velocity and density of hcp-Fe under Earth’s core conditions (2014)
  • Author(s): T. Sakamaki, E. Ohtani, H. Fukui, S. Kamada, S. Takahashi, T. Sakairi, A. Takahata, T. Sakai, S. Tsutsui, A. Q. R. Baron
  • Organizer: AGU Fall Meeting 2014
  • Place of Presentation: サンフランシスコ（アメリカ）
  • Year and Date: 2014-12-15 – 2014-12-19
  • Invited
• [Presentation] Melting relations in the Fe-S-Si system at high pressure and temperature: Implications for the thermal structure of the planetary core (2014)
  • Author(s): T. Sakairi, E. Ohtani, T. Sakai, S. Kamada, T. Sakamaki, N. Hirao
  • Organizer: AGU Fall Meeting 2014
  • Place of Presentation: サンフランシスコ（アメリカ）
  • Year and Date: 2014-12-15 – 2014-12-19
• [Presentation] The carbon-bearing phases in the subducted slabs under the lower mantle condition (2014)
  • Author(s): F. Maeda, E. Ohtani, S. Kamada, T. Sakamaki, Y. Ohishi, N. Hirao
  • Organizer: AGU Fall Meeting 2014
  • Place of Presentation: サンフランシスコ（アメリカ）
  • Year and Date: 2014-12-15 – 2014-12-19
• [Presentation] Compression and magnetic properties of Fe-Si alloys at high pressure (2014)
  • Author(s): N. Suzuki, S. Kamada, E. Ohtani, N. Hirao, M. Hamada, T. Sakamaki, Y. Ohishi, T. Mitsui, R. Masuda
  • Organizer: AGU Fall Meeting 2014
  • Place of Presentation: サンフランシスコ（アメリカ）
  • Year and Date: 2014-12-15 – 2014-12-19
• [Presentation] 高温高圧下における含水H相‐δ相固溶体(MgSi,Al2)O2(OH)2の安定領域と下部マントルの水 (2014)
  • Author(s): 大谷栄治、天池洋平、鎌田誠司、坂巻竜也、増野いずみ、村上元彦、鈴木昭夫、平尾直久
  • Organizer: 第55回高圧討論会
  • Place of Presentation: 徳島
  • Year and Date: 2014-11-22 – 2014-11-24
• [Presentation] 高圧での月の高Ti玄武岩の熔融関係 (2014)
  • Author(s): 五十嵐愛子、大谷栄治、坂巻竜也、朝原友紀、鈴木昭夫
  • Organizer: 日本惑星科学会 秋季講演会
  • Place of Presentation: 仙台
  • Year and Date: 2014-09-24 – 2014-09-26
• [Presentation] Ponded melt at the boundary between the lithosphere and asthenosphere (2014)
  • Author(s): T. Sakamaki, A. Suzuki, E. Ohtani, H. Terasaki, S. Urakawa, Y. Katayama, K. Funakoshi, Y. Wang, J. J. Hernlund, M. D. Ballmer
  • Organizer: Advances in High Pressure Research: Breaking Scales and Horizons
  • Place of Presentation: ノボシビルスク（ロシア）
  • Year and Date: 2014-09-22 – 2014-09-26
  • Invited
• [Presentation] Stability of hydrous phase h-δ solid solution in the lower mantle (2014)
  • Author(s): E. Ohtani, Y. Amaike, I. Ohira, S. Kamada, T. Sakamaki, A. Suzuki
  • Organizer: Advances in High Pressure Research: Breaking Scales and Horizons
  • Place of Presentation: ノボシビルスク（ロシア）
  • Year and Date: 2014-09-22 – 2014-09-26
• [Presentation] Physical properties of iron alloys and light elements in the core (2014)
  • Author(s): E. Ohtani, T. Sakamaki, S. Kamada, Y. Shibazaki, H. Fukui, A. Q. R. Baron
  • Organizer: Advances in High Pressure Research: Breaking Scales and Horizons
  • Place of Presentation: ノボシビルスク（ロシア）
  • Year and Date: 2014-09-22 – 2014-09-26
• [Presentation] The reactions in the MgCO3-SiO2 system in the slabs subducted into the lower mantle and formation of deep diamond (2014)
  • Author(s): F. Maeda, E. Ohtani, S. Kamada, T. Sakamaki, Y. Ohishi, N. Hirao
  • Organizer: Advances in High Pressure Research: Breaking Scales and Horizons
  • Place of Presentation: ノボシビルスク（ロシア）
  • Year and Date: 2014-09-22 – 2014-09-26
• [Presentation] Compression and magnetic properties of Fe-Si alloy using synchrotron radiation Mossbauer spectroscopy at high pressure (2014)
  • Author(s): N. Suzuki, S. Kamada, E. Ohtani, N. Hirao, M. Hamada, T. Sakamaki, Y. Ohishi, T. Mitsui, R. Masuda
  • Organizer: Advances in High Pressure Research: Breaking Scales and Horizons
  • Place of Presentation: ノボシビルスク（ロシア）
  • Year and Date: 2014-09-22 – 2014-09-26
• [Presentation] 高圧下におけるアノーサイトメルトの粘性・構造測定 (2014)
  • Author(s): 坂巻竜也、河野義生
  • Organizer: 日本鉱物科学会2014年年会
  • Place of Presentation: 熊本
  • Year and Date: 2014-09-17 – 2014-09-19
• [Presentation] 高チタン玄武岩の物性から見た月マントルの不均質性 (2014)
  • Author(s): 坂巻竜也
  • Organizer: 月・火星・水星内部研究会
  • Place of Presentation: 大阪
  • Year and Date: 2014-09-08 – 2014-09-09
• [Presentation] Silicate melts under pressure: structural links to density and viscosity behaviors (2014)
  • Author(s): Y. Wang, T. Sakamaki, L. Skinner, Z. Jing, T. Yu, Y. Kono, C. Park, G. Shen
  • Organizer: AOGS 2014
  • Place of Presentation: 札幌
  • Year and Date: 2014-07-28 – 2014-08-01
• [Presentation] Effect of structural change and volatiles on physical properties of magma and magma separation in the upper mantle (2014)
  • Author(s): E. Ohtani, T. Sakamaki, A. Suzuki, Y. Katayama
  • Organizer: Goldschmidt 2014
  • Place of Presentation: サクラメント（アメリカ）
  • Year and Date: 2014-06-08 – 2014-06-13
• [Presentation] Compressional sound velocity and density mearurements of hcp-Fe under core conditions (2014)
  • Author(s): T. Sakamaki, E. Ohtani, H. Fukui, S. Kamada, S. Takahashi, T. Sakairi, A. Takahata, T. Sakai, S. Tsutsui, A. Q. R. Baron
  • Organizer: Japan Geoscience Union 2014
  • Place of Presentation: 幕張
  • Year and Date: 2014-04-28 – 2014-05-02
• [Presentation] Hydrogen transport into the bottom of the lower mantle by phase H- phase delta solid solution MgSiO2(OH)2-AlOOH (2014)
  • Author(s): E. Ohtani, Y. Amaike, I. Ohira, S. Kamada, T. Sakamaki, N. Hirao
  • Organizer: Japan Geoscience Union 2014
  • Place of Presentation: 幕張
  • Year and Date: 2014-04-28 – 2014-05-02
• [Presentation] Stability of Hydrous phase H MgSiO2(OH)2 in the lower mantle (2014)
  • Author(s): Y. Amaike, E. Ohtani, S. Kamada, T. Sakamaki, S. Takahashi, N. Hirao, Y. Ohishi
  • Organizer: Japan Geoscience Union 2014
  • Place of Presentation: 幕張
  • Year and Date: 2014-04-28 – 2014-05-02
• [Presentation] The reaction between MgCO3 and SiO2 at high pressure and temperature and genesis of ultra-deep diamonds (2014)
  • Author(s): F. Maeda, E. Ohtani, S. Kamada, T. Sakamaki, S. Takahashi, A. Takahata, Y. Ohishi, N. Hirao
  • Organizer: Japan Geoscience Union 2014
  • Place of Presentation: 幕張
  • Year and Date: 2014-04-28 – 2014-05-02
• [Presentation] Potassium solubility into the Earth's core at the base of the magma ocean -Implication for the heat source of the core (2014)
  • Author(s): K. Watanabe, E. Ohtani, S. Kamada, T. Sakamaki, M. Miyahara
  • Organizer: Japan Geoscience Union 2014
  • Place of Presentation: 幕張
  • Year and Date: 2014-04-28 – 2014-05-02
• [Presentation] Study of physical properties of Fe-Si alloy at high pressureusing using synchrotron radiation Mossbauer spectroscopy (2014)
  • Author(s): 6)N. Suzuki, E. Ohtani, N. Hirao, S. Kamada, M. Hamada, T. Sakamaki, Y. Ohishi, R. Masuda, T. Mitsui
  • Organizer: Japan Geoscience Union 2014
  • Place of Presentation: 幕張
  • Year and Date: 2014-04-28 – 2014-05-02
• [Presentation] Experimental evidence for the deep high-Ti basalt magma in the lunar mantle (2014)
  • Author(s): A. Igarashi, A. Suzuki, E. Ohtani, Y. Asahara, T. Sakamaki
  • Organizer: Japan Geoscience Union 2014
  • Place of Presentation: 幕張
  • Year and Date: 2014-04-28 – 2014-05-02
• [Presentation] Sound velocity measurements of iron-light element alloys: A challenge to the core conditions (2014)
  • Author(s): E. Ohtani, T. Sakamaki, S. Kamada, H. Fukui, Y. Shibazaki, S. Takahashi, T. Sakai, S. Tsutsui, A. Q. R. Baron
  • Organizer: RIKEN SPring-8 Center Workshop on Elastic Properties of Iron in Extreme Conditions via X-ray Scattering
  • Place of Presentation: 宝塚
• [Presentation] Sound velocity of iron up to 160 Gigapascals and 3000 Kelvin (2014)
  • Author(s): T. Sakamaki, E. Ohtani, H. Fukui, S. Kamada, S. Takahashi, T. Sakairi, A. Takahata, T. Sakai, S. Tsutsui, A. Q. R. Baron
  • Organizer: RIKEN SPring-8 Center Workshop on Elastic Properties of Iron in Extreme Conditions via X-ray Scattering
  • Place of Presentation: 宝塚
• [Presentation] The stable phase in the MgCO3-SiO2 system under the lower mantle conditions and formation of ultra-deep diamonds (2014)
  • Author(s): F. Maeda, E. Ohtani, S. Kamada, T. Sakamaki, S. Takahashi, A. Takahata
  • Organizer: 11th International Workshop on Water Dynamics
  • Place of Presentation: 仙台
• [Presentation] Stability field of phase H MgSiO2(OH)2 at lower mantle condition (2014)
  • Author(s): Y. Amaike, E. Ohtani, S. Kamada, T. Sakamaki, S. Takahashi, N. Hirao, Y. Ohishi
  • Organizer: 11th International Workshop on Water Dynamics
  • Place of Presentation: 仙台
• [Presentation] 高圧・高温下でのFe-NiおよびFe-Ni-Si合金の融解および相関係 (2014)
  • Author(s): 高畑明拓、大谷栄治、鎌田誠司、坂巻竜也、宮原正明、平尾直久
  • Organizer: 東北大学大学院理学研究科 第7回6専攻合同シンポジウム「ヤングブレインズの連携による学際的研究の興隆」
  • Place of Presentation: 仙台
• [Presentation] Basaltic magmas at high pressures and the origin of the lithosphere-asthenosphere boundary (2013)
  • Author(s): T. Sakamaki, A. Suzuki, E. Ohtani, H. Terasaki, S. Urakawa, Y. Katayama, K. Funakoshi, Y. Wang, J. W. Hernlund, M. D. Ballmer
  • Organizer: Japan Geoscience Union 2013
  • Place of Presentation: 幕張
  • Invited
• [Presentation] Sound velocity of iron-light-element alloys at high pressure and temperature and composition and thermal state of the inner core (2013)
  • Author(s): E. Ohtani, T. Sakai, S. Kamada, T. Sakamaki, K. Mibe, Y. Shibazaki, H. Fukui, S. Tsutsui, A. Q. R. Baron
  • Organizer: Japan Geoscience Union 2013
  • Place of Presentation: 幕張
• [Presentation] Melting relations of Fe-Ni-Si and Fe-Ni alloys up to 135 GPa (2013)
  • Author(s): A. Takahata, E. Ohtani, S. Kamada, M. Miyahara, T. Sakamaki
  • Organizer: Japan Geoscience Union 2013
  • Place of Presentation: 幕張
• [Presentation] Sound velocity of iron-light-element alloy at high pressure and temperature and composition and thermal state of the inner core (2013)
  • Author(s): E. Ohtani, T. Sakai, S. Kamada, T. Sakamaki, K. Mibe, Y. Shibazaki, H. Fukui, S. Tsutsui, A. Q. R. Baron
  • Organizer: AOGS 10th Annual Meeting
  • Place of Presentation: ブリスベン（オーストラリア）
• [Presentation] Silicate melts under high pressure (2013)
  • Author(s): Y. Wang, T. Sakamaki, L. Skinner, G. Shen, T. Yu, Y. Kono, Z. Jing, C. Park
  • Organizer: Goldschmidt 2013
  • Place of Presentation: フィレンツェ（イタリア）
• [Presentation] Microscopic origin of the dichotomous viscosity-pressure behavior in silicate melts (2013)
  • Author(s): Y. Wang, T. Sakamaki, L. Skinner, Z. Jing, T. Yu, Y. Kono, C. Park, G. Shen, M. L. Rivers, S. R. Sutton
  • Organizer: AGU Fall meeting 2013
  • Place of Presentation: サンフランシスコ（アメリカ）
• [Presentation] Pressure effect on the elasticity and structure of Na-silicate glasses (2013)
  • Author(s): T. Yu, T. Sakamaki, Y. Kono, Z. Jing, H. Watson, Y. Wang, G. Shen
  • Organizer: AGU Fall meeting 2013
  • Place of Presentation: サンフランシスコ（アメリカ）
• [Presentation] Constraints on the properties of the Moon’s outer core from High-pressure sound velocity measurements on Fe-S liquids (2013)
  • Author(s): Z. Jing, Y. Wang, Y. Kono, T. Yu, T. Sakamaki, C. Park, M. L. Rivers, S.R. Sutton, G. Shen
  • Organizer: AGU Fall meeting 2013
  • Place of Presentation: サンフランシスコ（アメリカ）
• [Presentation] Stability and melting relations of Fe3C up to 3 Mbar: Implication for the carbon in the Earth’s inner core (2013)
  • Author(s): S. Takahashi, E. Ohtnai, T. Sakai, I. Mashino, S. Kamada, M. Miyahara, T. Sakamaki, N. Hirao, Y. Ohishi
  • Organizer: AGU Fall meeting 2013
  • Place of Presentation: サンフランシスコ（アメリカ）
• [Presentation] The melting and phase relations of Fe-Ni and Fe-Ni-Si alloys up to 100 GPa (2013)
  • Author(s): A. Takahata, E. Ohtani, S. Kamada, T. Sakamaki, N. Hirao
  • Organizer: AGU Fall meeting 2013
  • Place of Presentation: サンフランシスコ（アメリカ）
• [Presentation] The abundance of potassium in the Earth’s core (2013)
  • Author(s): K. Watanabe, E. Ohtani, S. Kamada, T. Sakamaki, M. Miyahara
  • Organizer: AGU Fall meeting 2013
  • Place of Presentation: サンフランシスコ（アメリカ）
• [Presentation] レーザー加熱による高温高圧X線非弾性散乱によるhcp-Feの縦波速度測定 (2013)
  • Author(s): 大谷栄治、坂巻竜也、福井宏之、鎌田誠司、高橋豪、坂入崇紀、高畑明拓、境毅、筒井聡、Baron Alfred
  • Organizer: 日本鉱物科学会2013
  • Place of Presentation: 筑波
• [Presentation] 下部マントル条件下におけるフェロペリクレースのスピン転移：放射光X線回折およびメスバウアー分光同時測定システムを用いた研究 (2013)
  • Author(s): 浜田麻希、大谷栄治、鎌田誠司、坂巻竜也、平尾直久、大石泰生
  • Organizer: 日本鉱物科学会2013
  • Place of Presentation: 筑波
• [Presentation] 下部マントル条件下におけるウスタイトおよびフェロペリクレースのスピン転移 (2013)
  • Author(s): 浜田麻希、大谷栄治、鎌田誠司、坂巻竜也、平尾直久、大石泰生、三井隆也、増田亮
  • Organizer: 第54回高圧討論会
  • Place of Presentation: 新潟