地球中心核の構成と進化

2007 Fiscal Year Annual Research Report

• Project/Area Number: 18104009
• Research Institution: Tohoku University
• Principal Investigator: 大谷 栄治 Tohoku University, 大学院・理学研究科, 教授 (60136306)
• Co-Investigator(Kenkyū-buntansha): 近藤 忠 大阪大学, 大学院・理学研究科, 教授 (20252223) ; 鈴木 昭夫 東北大学, 大学院・理学研究科, 准教授 (20281975) ; 寺崎 英紀 東北大学, 大学院・理学研究科, 助教 (50374898) ; 宮原 正明 東北大学, 大学院・理学研究科, 助教(COE) (90400241)
• Keywords: 地殻・マントル物質 / 固体地球物理学 / 岩鉱・鉱物・鉱床学 / 地球惑星内部構造 / 高温高圧

Research Abstract

今年度は、核マントル境界の反応、外核の金属鉄メルトの物性、内核の結晶構造と地震波異方性についての研究が進展した。具体的には以下のような成果が得られた。
(1) 金属鉄と高圧で安定な含水相AlOOH相との反応を明らかにした.60GPa以上の圧力では,1300K以上でFeHが生成し,含水相は不安定化することが明らかになった.
(2) 試料の安定な過熱のために,加熱領域を絞ることができるファイバーレーザーシステムを導入し,100GPa以上でも効果的に過熱できるようになった.
(3) 内核の条件に近い256GPa、3600Kにおいて、高温高圧実験を可能にし、Fe-Si系の高圧相としてhcp相が安定であることを明らかにし、内核の異方性がhcpのFeSi相の選択配向である可能性を示した。
(4) 外核の性質を解明するために,Fe-Sメルトの密度を3GPa程度まで明らかにした.測定には浮沈法とともに放射光を用いたX線ラジオグラフィ法を使用した.
1.5GPaのもとでFe-S, Fe-C系のメルトの界面エネルギーの測定に世界で始めて成功した.

Research Products

• [Journal Article] Application of FIB system to ultra-high pressure Earth science (2008)
  • Author(s): Miyahara M., Sakai T., Kobayashi Y., Ohtani E., Kondo T., Nagase T., Yoo J.-H., Nishijima M. and Vashaei Z
  • Journal Title: Journal of Mineralogical and Petrological Sciences. (in press)
  • Peer Reviewed
• [Journal Article] プラスチックガスケット(トロイダル) (2007)
  • Author(s): 寺崎英紀、浦川啓、舟越賢一
  • Journal Title: KEK proceedings 7 Pages: 48-51
  • Peer Reviewed
• [Journal Article] 高温高圧下でのイメージング実験 (2007)
  • Author(s): 鈴木昭夫、西田圭佑、坂巻竜也、寺崎英紀、大谷栄治
  • Journal Title: KEK proceedings 7 Pages: 61-64
  • Peer Reviewed
• [Journal Article] In-situ observation and determination of liquid immiscibility in the Fe-O-S melt at 3 GPa using a synchrotron X-ray radiographic technique (2007)
  • Author(s): Tsuno, K., H. Terasaki, E. Ohtani, A. Suzuki, Y. Asahaza, K. Nishida, T. Sakamaki, K. Funakoshi, T. Kikegawa
  • Journal Title: Geophysical Research Letters 34 Pages: 10.1029/2007GL030750
  • Peer Reviewed
• [Journal Article] Interconnectivity of Fe-O-S liquid in polycrystalline silicate perovskite at lower mantle conditions (2007)
  • Author(s): Terasaki, H., D. J. Frost, D. C. Rubie, F. Langenhorst
  • Journal Title: Physics of Earth and Planetary Interiors 161 Pages: 170-176
  • Peer Reviewed
• [Journal Article] Immiscible two-liquid regions in the Fe-O-S system at high pressure: implications for planetary cores (2007)
  • Author(s): Tsuno, K., E. Ohtani, H. Terasaki
  • Journal Title: Physics of the Earth and Planetary Interiors, 160, Pages: 75-85
  • Peer Reviewed
• [Journal Article] In situ observation of liquid immiscibility of Fe-O-S liquid using X-ray radiography under high pressure (2007)
  • Author(s): Terasaki H., Ohtani E, Suzuki A., Tsuno K., Asahara Y., Sakamaki T., Ozawa S., Shibazaki Y., Ghosh S., Litasov K., Nishida K., Funakoshi K.
  • Journal Title: Spring-8 User Experimental Report 2007A
• [Presentation] The effects of temperature and light elements on the interfacial tension of liquid iron under high pressure (2007)
  • Author(s): Terasaki, H., Urakawa, S., Funakoshi, K., Ohtani, E., Suzuki, A., Nishida, K., Sakamaki, T., Shibazaki, Y., Nishiyama, N., Wang., Y.,
  • Organizer: AGU Fall Meeting
  • Place of Presentation: San Francisco
  • Year and Date: 20071210-14
• [Presentation] Melting curve of iron-silicon alloy up to the core-mantle boundary pressure: Implications to the thermal structure of the Ear (2007)
  • Author(s): Asanuma, H., Ohtani, E., Sakai, T., Terasaki, H., Kamada, S., Kondo, T., Kikegawa, T.,
  • Organizer: AGU Fall Meeting
  • Place of Presentation: San Francisco
  • Year and Date: 20071210-14
• [Presentation] Wadsleyite and ringwoodite formation from melt induced by a shock event in Peace River L6 chondrite (2007)
  • Author(s): Miyahara M, El Goresy A., Eiji Ohtani E., Ferroir T., Gillet P., Toshiro Nagase T., Nishijima M. and Vashaei Z.
  • Organizer: AGU Fall Meeting
  • Place of Presentation: San Francisco
  • Year and Date: 20071210-14
• [Presentation] In-situ observation of immiscible liquids in the Fe-O-S system at 3GPa using the X-ray radiographic technique (2007)
  • Author(s): Tsuno, K., Terasaki, H., Ohtani, E., Suzuki, A., Asahara, Y., Nishida, K., Sakamaki, T., Funakoshi, K., Kikegawa, T.
  • Organizer: International Workshop on Synchrotron High-Pressure Mineral Physics and Materials Science
  • Place of Presentation: Chicago
  • Year and Date: 20071206-07
• [Presentation] Development of high-temperature and high-pressure X-ray tomography technique: application to sessile drop interfacial energy measurement (2007)
  • Author(s): Urakawa S., Terasaki H., Funakoshi, K., Nishiyama, N., Sanehira, T., Wang, Y.
  • Organizer: International Workshop on Synchrotron High-Pressure Mineral Physics and Materials Science
  • Place of Presentation: Chicago
  • Year and Date: 20071206-07
• [Presentation] Chemical equilibrium between silicate and molten iron at the bottom of magma ocean and the present core-mantle boundary (2007)
  • Author(s): Sakai T., Ohtani E., Terasaki H., Miyahara M., Nishijima M., Kikegawa T.
  • Organizer: EASTEC Symposium 2007
  • Place of Presentation: Sendai
  • Year and Date: 20070918-21
• [Presentation] Equation of state of liquid FeS at high pressure (2007)
  • Author(s): Nishida K., Ohtani E., Urakawa S., Suzuki A, Terasaki H., Sakamaki T., Katayama Y., Kikegawa T.
  • Organizer: EASTEC Symposium 2007
  • Place of Presentation: Sendai
  • Year and Date: 20070918-21
• [Presentation] The application of a FIB-TEM/STEM work to the Earth and Planetary Science (2007)
  • Author(s): Mryahara M., Sakai T., Ohtani E., Uehara S., El Goresy A., Kamada S., Kondo T., Nagase T., Nishijima M., Vashaei Z., Yoo J. H. and Kitagawa R
  • Organizer: The 21st century COE[Earth Science]international symposium
  • Place of Presentation: Sendai
  • Year and Date: 20070918-21
• [Presentation] The effect of sulphur content on interfacial energy of Fe-S liquid under high pressure using sessile drop method (2007)
  • Author(s): Terasaki H., Urakawa S., Funakoshi K., Nishiyama N., Wang Y., Suzuki A., Nishida K., Sakamaki T., Ohtani E.
  • Organizer: Joint 21st AIRAPT and 45th EHPRG International Conference on High Pressure Science and Technology
  • Place of Presentation: Italy
  • Year and Date: 20070916-21
• [Presentation] Equation of state of liquid FeS (2007)
  • Author(s): Nishida K., Ohtani E., Urakawa S., Suzuki A., Terasaki H., Sakamaki T., Katayama Y., Kikegawa T.
  • Organizer: Joint 21st AIRAPT and 45th EHPRG International Conference on High Pressure Science and Technology
  • Place of Presentation: Italy
  • Year and Date: 20070916-21
• [Presentation] The FIB milling of LHDAC sample for TEM, EMPA and SEM analyses (2007)
  • Author(s): Miyahara M, Sakai T., Ohtani E., Kobayashi Y, Kamada S., Kondo T. and Nagase T.
  • Organizer: he Japan Geoscience Union Meeting 2007
  • Place of Presentation: Makuhari
  • Year and Date: 20070519-24
• [Presentation] Measurement of interfacial energy of Fe-S liquid under high pressure using X-ray radiography and tomography techniques (2007)
  • Author(s): Terasaki H., Urakawa S., Funakoshi K., Nishiyama N, Wang Y., Nishida K., Sakamaki T., Suzuki A., Ohtani E.
  • Organizer: 7th High Pressure Mineral Physics Seminar
  • Place of Presentation: Matsushima
  • Year and Date: 20070508-12
• [Presentation] Density measurements of liquid FeS at high pressure using X-ray absorption method (2007)
  • Author(s): Nishida K., Ohtani E., Urakawa S., Suzuki A., Terasaki H., Sakamaki T., Katayama Y., Kikegawa T.
  • Organizer: 7th High Pressure Mineral Physics Seminar
  • Place of Presentation: Matsushima
  • Year and Date: 20070508-12
• [Presentation] Melting curve of Fe-Si alloy up to core-mantle boundary pressure (2007)
  • Author(s): Asanuma H., Ohtani E., Sakai T., Kamada S., Terasaki H., Kondo T., Kikegawa T.
  • Organizer: 7th High Pressure Mineral Physics Seminar
  • Place of Presentation: Matsushima
  • Year and Date: 20070508-12
• [Presentation] Light elements in the core estimated from chemical interaction between silicate and molten iron (2007)
  • Author(s): Sakai T., Ohtani E., Kondo T., Terasaki H., Miyahara M., Nishijima M., Vashaei Z., Kikega wa T., Hirao N., Sata N., Ohishi Y.
  • Organizer: 7th High Pressure Mineral Physics Seminar
  • Place of Presentation: Matsushima
  • Year and Date: 20070508-12
• [Presentation] Partitioning of Ni and Co between metallic iron and lower mantle minerals at high pressure. (2007)
  • Author(s): Sawada N., Ohtani E., Kondo T., Terasaki H., Sakai T.
  • Organizer: 7th High Pressure Mineral Physics Seminar
  • Place of Presentation: Matsushima
  • Year and Date: 20070508-12
• [Presentation] The application of FIB system to high-pressure Earth science (2007)
  • Author(s): Miyahara M., Sakai T., Ohtani E., Kobayashi Y., Kamada S., Kondo T., El Goresy A., Nagase T., Yoo J. H., Nishijima M. and Vashaei Z.
  • Organizer: 7th high pressure mineral physics seminar
  • Place of Presentation: Matsushima
  • Year and Date: 20070508-12
• [Presentation] 地球深部研究へのFIB及びTEM法の適用 (2007)
  • Author(s): 宮原正明
  • Organizer: イオンビームを用いた電顕試料作成のセミナー
  • Place of Presentation: Tokyo
  • Year and Date: 2007-08-23