Melting temperature determination in the Earth's core conditions

• Project/Area Number: 24684038
• Research Category: Grant-in-Aid for Young Scientists (A)
• Allocation Type: Partial Multi-year Fund
• Research Field: Petrology/Mineralogy/Science of ore deposit
• Research Institution: Okayama University (2015); Tokyo Institute of Technology
• Principal Investigator: Tateno Shigehiko 岡山大学, 地球物質科学研究センター, 准教授 (30572903)
• Project Period (FY): 2012-04-01 – 2016-03-31
• Project Status: Completed (Fiscal Year 2015)
• Budget Amount: ¥24,050,000 (Direct Cost: ¥18,500,000、Indirect Cost: ¥5,550,000); Fiscal Year 2015: ¥3,770,000 (Direct Cost: ¥2,900,000、Indirect Cost: ¥870,000); Fiscal Year 2014: ¥6,370,000 (Direct Cost: ¥4,900,000、Indirect Cost: ¥1,470,000); Fiscal Year 2013: ¥7,670,000 (Direct Cost: ¥5,900,000、Indirect Cost: ¥1,770,000); Fiscal Year 2012: ¥6,240,000 (Direct Cost: ¥4,800,000、Indirect Cost: ¥1,440,000)
• Keywords: 地球中心核 / 高温高圧実験 / ダイヤモンドアンビルセル / ダイアモンドアンビルセル / 核

Outline of Final Research Achievements

Phase relations were investigated for Fe, Fe-Si, and Fe-S systems over 200 GPa. High-pressure and -temperature experiments were performed by laser-heated diamond anvil-cell technique. Presence/absence of melting upon heating was determined by a combination of in-situ and ex-situ analysis of synchrotron X-ray and chemical analysis on a recovered sample. Obtained melting curve of core materials tightly constrained the inner-core/outer-core boundary temperature of the present Earth.

Research Products

• [Int'l Joint Research] Universite Pierre et Marie Curie(フランス)
• [Journal Article] Carbon-depleted outer core revealed by sound velocity measurements of liquid iron–carbon alloy (2015)
  • Author(s): Nakajima, Y., Imada, S., Hirose, K., Komabayashi, T., Ozawa, H., Tateno, S., Tsutsui, S., Kuwayama, Y. and Baron, A.
  • Journal Title: Nature Commun. Volume: 6 Issue: 1 Pages: 8942-8942
  • DOI: 10.1038/ncomms9942
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] The structure of Fe-Si alloy in Earth’s inner core (2015)
  • Author(s): Shigehiko Tateno, Yasuhiro Kuwayama, Kei Hirose, Yasuo Ohishi
  • Journal Title: Earth and Planetary Science Letters Volume: 418 Pages: 11-19
  • DOI: 10.1016/j.epsl.2015.02.008
  • Peer Reviewed
• [Journal Article] Melting experiments on peridotite to lowermost mantle conditions (2014)
  • Author(s): Tateno, S., Hirose, K., Ohishi, Y.
  • Journal Title: Journal of Geophysical Research, Solid Earth Volume: 119 Issue: 6 Pages: 4684-4694
  • DOI: 10.1002/2013jb010616
  • Peer Reviewed
• [Journal Article] The structure of Fe-Ni alloy in Earth’s inner core (2012)
  • Author(s): Tateno, S.
  • Journal Title: Geophysical Research Letters Volume: 39 Issue: 12
  • DOI: 10.1029/2012gl052103
  • Peer Reviewed
• [Presentation] Phase relations in the Fe-FeS system to 260 GPa (2016)
  • Author(s): 舘野繁彦
  • Organizer: MISASA IV
  • Place of Presentation: ブランナール三朝, 鳥取県三朝町
  • Year and Date: 2016-03-09
  • Int'l Joint Research
• [Presentation] 超高圧下における鉱物-メルト間の微量元素分配 (2014)
  • Author(s): 舘野繁彦, 坂田周平, 平田岳史, 廣瀬敬
  • Organizer: 高圧討論会
  • Place of Presentation: 徳島大学
  • Year and Date: 2014-11-24
  • Invited
• [Presentation] 下部マントル鉱物-メルト間の元素分配 (2014)
  • Author(s): 舘野繁彦, 坂田周平, 平田岳史, 廣瀬敬
  • Organizer: 地球惑星科学連合大会
  • Place of Presentation: パシフィコ横浜
  • Year and Date: 2014-05-13
• [Presentation] 内核の結晶構造
  • Author(s): 舘野繁彦, 廣瀬敬, 大石泰生
  • Organizer: 日本地球惑星科学連合2013年大会
  • Place of Presentation: 幕張メッセ
• [Presentation] 高圧下におけるマントル物質の融解実験：融解相関係と鉱物-メルト間の元素分配
  • Author(s): 舘野繁彦, 坂田周平, 平田岳史, 廣瀬敬
  • Organizer: 第54回日本高圧力学会
  • Place of Presentation: 朱鷺メッセ 新潟コンベンションセンター
• [Presentation] ダイヤモンドアンビルセル高圧発生装置による超高圧地球化学
  • Author(s): 舘野繁彦, 坂田周平, 平田岳史, 廣瀬敬
  • Organizer: 日本鉱物科学会年会
  • Place of Presentation: 筑波大学
  • Invited
• [Presentation] Crystal structure in Earth's inner core
  • Author(s): 舘野繁彦
  • Organizer: pre-SEDI 2013
  • Place of Presentation: 湘南国際村 葉山 神奈川県
  • Invited
• [Book] 鉄の事典 (2014)
  • Author(s): 増本健・金森順次郎・馬越佑吉・福山秀敏・友野宏・中島英雅・北田正弘編
  • Total Pages: 820
  • Publisher: 朝倉書店