Investigation on the physical properties of lower mantle minerals under high-pressure and -temperature condition, and elucidation of the dynamics at lowermost mantle

• Project/Area Number: 18684029
• Research Category: Grant-in-Aid for Young Scientists (A)
• Allocation Type: Single-year Grants
• Research Field: Petrology/Mineralogy/Science of ore deposit
• Research Institution: Tohoku University (2008); Okayama University (2006-2007)
• Principal Investigator: MURAKAMI Motohiko Tohoku University, 大学院理学研究科, 准教授 (50401542)
• Project Period (FY): 2006 – 2008
• Project Status: Completed (Fiscal Year 2008)
• Budget Amount: ¥30,030,000 (Direct Cost: ¥23,100,000、Indirect Cost: ¥6,930,000); Fiscal Year 2008: ¥3,510,000 (Direct Cost: ¥2,700,000、Indirect Cost: ¥810,000); Fiscal Year 2007: ¥9,360,000 (Direct Cost: ¥7,200,000、Indirect Cost: ¥2,160,000); Fiscal Year 2006: ¥17,160,000 (Direct Cost: ¥13,200,000、Indirect Cost: ¥3,960,000)
• Keywords: 下部マントル / 高圧地球科学 / 弾性波速度測定 / 地球下部マントル / 地球物質科学 / 音速測定 / 高温高圧力 / 高温高圧実験

Research Abstract

高温高圧のその場での高圧相合成した多結晶体からの弾性波速度を下部マントル最下部条件までの圧力において測定することに世界で初めて成功した。シリケイトサンプルの測定についても予備的実験をいくつか繰り返し、最適な干渉計の条件設定とレーザー出力との関係を綿密に調査し、加熱中のブリルアン散乱シグナルの測定を可能にした。。またこの技術開発をさらに発展させ大型放射光施設Spring-8において高温高圧条件下での音速その場測定システムの導入を行い、レーザー加熱光学系の構築および温度測定のためのシステムの開発は予定通りの時間スケールで導入することができた。下部マントルにおける高温高圧力での測定を行うことに成功した。

Research Products

• [Journal Article] Development of in-situ Brillouin spectroscopy at high pressure and temperature with synchrotron radiation and infrared laser heating system : Application to the Earth's deep interior (2009)
  • Author(s): M. Murakami, Y. Asahara, Y. Ohishi, N. Hirao, K. Hirose
  • Journal Title: Physics of the Earth and Planetary Interiors 174 Pages: 282-291
  • Peer Reviewed
• [Journal Article] Elasticity of MgO to 130 Gpa : Implications for lower mantle mineralogy (2009)
  • Author(s): M. Murakami, Y. Ohishi, N. Hirao, K. Hirose
  • Journal Title: Earth and Planetary Science Letters 277 Pages: 123-129
  • Peer Reviewed
• [Journal Article] Elasticity of MgO to 130 GPa : Implications for lower mantle mineralogy (2009)
  • Author(s): Murakami, M., Y. Ohishi, N. Hirao and K. Hirose
  • Journal Title: Earth and Planetary Science Letters 277 Pages: 123-129
  • Peer Reviewed
• [Journal Article] Bass Single-crystal elasticity of iron-bearing majorite to 26 Gpa : Implications for the seismic velocity structure of the mantle transition zone (2008)
  • Author(s): M. Murakami, S. V. Sinogeikin, K. Litasov, E. Ohtani, J. D
  • Journal Title: Earth and Planetary Science Letters 274 Pages: 339-345
  • Peer Reviewed
• [Journal Article] Sound velocities of MgSiO3 perovskite and post-perovskite phase (2008)
  • Author(s): M. Murakami
  • Journal Title: The Review of High Pressure Science and Technology 18 (1) Pages: 21-30
  • Peer Reviewed
• [Journal Article] Single-crYstal elasticity of iron-bearing majorite to 26 GPa : Implications for the seismic velocity structurel of the mantle transition zone (2008)
  • Author(s): Murakami, M., S. V. Sinogeikin, K. Litasov, E. Ohtani and J. D. Bass
  • Journal Title: Earth and Planetary Science Letters 274 Pages: 339-345
  • Peer Reviewed
• [Journal Article] MgSiO3ペロブスカイトとポストペロブスカイト相の音速測定 (2008)
  • Author(s): 村上元彦
  • Journal Title: 高圧力の科学と技術 18 Pages: 21-30
  • Peer Reviewed
• [Journal Article] Development of in situ Brillouin spectroscopy at high pressure and temperature using synchrotron radiation and infrared laser heating system : application to the earth's deep interior (2007)
  • Author(s): M. Murakami
  • Journal Title: Spring-8 Research Frontiers 1 Pages: 10-11
• [Journal Article] Sound velocity of MgSiO3 post-perovskite phase: A constraint on the D"discontinuity (2007)
  • Author(s): M. Murakami, S. V. Sinogeikin, J. D. Bass, N. Sata, Y. Ohishi, K. Hirose
  • Journal Title: Earth and Planetary Science Letters 259 (1-2) Pages: 18-23
  • Peer Reviewed
• [Journal Article] Sound velocity of MgSiO3 perovskite to Mbar pressure (2007)
  • Author(s): M. Murakami, S. V. Sinogeikin, H. Hellwig, J. D. Bass and J. Li
  • Journal Title: Earth and Planetary Science Letters 256 (1-2) Pages: 47-54
  • Peer Reviewed
• [Journal Article] Sound velocity of MgSiO_3 perovskite to Mbar pressure (2007)
  • Author(s): M.Murakami, S.V.Sinogeikin, H.Hellwig, J.D.Bass, J.Li
  • Journal Title: Earth and Planetary Science Letters 256 Pages: 47-54
• [Presentation] High Pressure Mineralogy to Investigate the Deep Earth (2009)
  • Author(s): Murakami, M
  • Organizer: Japanese-French Frontiers of Science Symposium
  • Place of Presentation: 湘南国際村(神奈川)
  • Year and Date: 2009-01-21
• [Presentation] Sound Velocities of Lower Mantle Minerals : Implications for lower mantle mineralogy (2009)
  • Author(s): M. Murakami
  • Organizer: Stagnant Slab Project International Symposium on "DEEP SLAB and MANTLE DYNAMICS"
  • Place of Presentation: Kyoto (Japan)
• [Presentation] High Pressure Mineralogy to Investigate the Deep Earth (2009)
  • Author(s): M. Murakami
  • Organizer: Japanese-French Frontiers of Science Symposium
  • Place of Presentation: Kanagawa (Japan)
• [Presentation] Elasticity of MgO to 130 Gpa : Implications for lower mantle mineralogy (2008)
  • Author(s): M. Murakami, Y. Ohishi, N. Hirao and K. Hirose
  • Organizer: American Geophysical Union, Fall Meeting 2008
  • Place of Presentation: San Francisco, USA
• [Presentation] Sound velocities of MgSiO3 perovskite and post-perovskite : A constraint on the D" discontinuity (2007)
  • Author(s): M. Murakami
  • Organizer: 24th European Crystallographic Meeting
  • Place of Presentation: Marrakech (Morocco)
• [Presentation] Sound velocities of MgSiO3 perovskite and post-perovskite (2007)
  • Author(s): M. Murakami, S. Sinogeikin, H. Holger, J. Bass, N. Sata, Y. Ohishi, K. Hirose
  • Organizer: 7th High Pressure Mineral Physics Seminar
  • Place of Presentation: Matsushima (Japan)
• [Presentation] Sound Velocity of MgSiO3 Post-Perovskite Phase: Constraints on the D" discontinuity (2006)
  • Author(s): M. Murakami, S. Sinogeikin, J. Bass, N. Sata, Y. Ohishi, K. Hirose
  • Organizer: American Geophysical Union, Fall Meeting
  • Place of Presentation: San Francisco (USA)
• [Presentation] Discovery of Post-Perovskite Phase in Silicates and the Mineralogy of the Lowermost Mantle (2006)
  • Author(s): M. Murakami
  • Organizer: Annual Meeting of the German Mineralogical Society
  • Place of Presentation: Hannover (Germany)
• [Presentation] Mineralogy in the Earth's lowermost mantle (2006)
  • Author(s): M. Murakami
  • Organizer: Workshop on High Pressure and Synchrotron Radiation at ESRF
  • Place of Presentation: Grenoble (France)
• [Remarks]
  • URL: http://db.tohoku.ac.jp/whois/detail/be3c3fa85005f925339e446de0cf4d23.html