Structure and Evolution of the Earth's Core

2008 Fiscal Year Self-evaluation Report

• Project/Area Number: 18104009
• Research Category: Grant-in-Aid for Scientific Research (S)
• Allocation Type: Single-year Grants
• Research Field: Petrology/Mineralogy/Science of ore deposit
• Research Institution: Tohoku University
• Principal Investigator: OHTANI Eiji Tohoku University, 大学院・理学研究科, 教授 (60136306)
• Project Period (FY): 2006 – 2009
• Keywords: 内核 / 外核 / 核マントル境界 / 高温高圧 / 鉄ニッケル合金 / 軽元素

Research Abstract

本研究では、地球核の条件を実現し、そこでの核構成物質の構造と物性を高温高圧実験にもとづいて明らかにし、地球核の実態を解明することを目的としている。この研究では、(1) 内核を構成する物質の解明、(2) 内核と外核の反応と元素分配関係と地球核の形成と進化の解明、(3) 外核を構成する金属液体の物性の解明、外核とマントルの反応様式の解明を重点目標にして研究を行うものである。

Research Products

• [Journal Article] Phase relations of Fe-Si alloy up to core conditions : Implications for the Earth inner core (2008)
  • Author(s): Asanuma, H., E. Ohtani, T. Sakai, H. Terasaki, S. Kamada, N. Hirao, N. Sata, Y. Ohishi
  • Journal Title: Geophysical Research Letters 35, doi : 10.1029/2008GL033863
  • Peer Reviewed
• [Journal Article] The effect of sulfur content on density of the liquid Fe-S at high pressure (2008)
  • Author(s): Nishida K., Terasaki H., Ohtani E., Suzuki A.
  • Journal Title: Phys. Chem. Minerals doi 10.1007/s00269-008-0236-4
  • Peer Reviewed
• [Journal Article] Recent advances in the study of mantle phase transitions (2008)
  • Author(s): Ohtani, E., and Sakai,T.
  • Journal Title: Physics of the Earth and Planetary Interiors 170 Pages: 240-247
  • Peer Reviewed
• [Journal Article] Interaction between iron and post-perovskite at core-mantle boundary and core signature in plume source region (2006)
  • Author(s): Sakai T., Kondo T., Ohtani E., Terasaki H., Endo N., Kuba T., Suzuki T., and Kikegawa T.
  • Journal Title: Geophys. Res. Lett 33doi : 10.1029/2006GL026868
  • Peer Reviewed
• [Journal Article] Partitioning of potassium between iron and silicate at the core-mantle boundary (2006)
  • Author(s): Hirao N., Ohtani E., Kondo T., Endo N., Kuba T., Suzuki T., and Kikegawa T
  • Journal Title: Geophys. Res. Lett 33, doi : 10.1029/2005GL025324
  • Peer Reviewed
• [Presentation] Chemical reactions and element partitioning at the core-mantle boundary (2008)
  • Author(s): Ohtani E.
  • Organizer: Goldschmidt 2008
  • Place of Presentation: Vancouver, Canada
  • Year and Date: 20080713-18
• [Presentation] Physical and chemical properties of melts under deep earth conditions and their importance in geodynamics (2007)
  • Author(s): Ohtani E.
  • Organizer: 2007 AGU Fall Meeting, San Francisco,USA
  • Place of Presentation: Bowen Lecture, Invited
  • Year and Date: 20071210-14
• [Presentation] Metal-silicate fractionation in the deep magma ocean and light elements in the core, 16th Annual V.M. (2006)
  • Author(s): Ohtani, E., T. Sakai, T. Kawazoe, T. Kondo
  • Organizer: Goldschmidt Conference 2006, S3-03
  • Place of Presentation: Melbourne, Australia
  • Year and Date: 20060826-0902
• [Book] Special Issue of Phys. Earth Planet. Inter.,Elsevier (2009)
  • Author(s): Ohtani, E. et al.(Editor)
  • Publisher: Advances in High Pressure Mineral Physics : from Deep Mantle to the Core. Proceedings of High-Pressure Mineral Physics Seminar-7(in press)
• [Book] Geological Soc. Am., Monograph volume 421 (2007)
  • Author(s): Ohtani E.(Editor)
  • Total Pages: 242
  • Publisher: Advance in High Pressure Mineralogy
• [Remarks] 受賞等 : 大谷栄治(研究代表者)
  • URL: http://www.ganko.tohoku.ac.jp/bussei/achievement/kakenhi/S_HP18-22/index.html
• [Remarks] Bowen Award from VGP section-AGU, (米国地球物理学連合より)2007
• [Remarks] Distinguished Professor (東北大より2008) 寺崎英紀(研究分担者)
• [Remarks] 平成20年度鉱物科学会研究奨励賞受賞(日本鉱物科学会より)
• [Remarks] 平成20年度日本高圧力学会奨励賞受賞(日本高圧力学会より)