In situ observation of magma at upper mantle conditions

• Project/Area Number: 24540514
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Petrology/Mineralogy/Science of ore deposit
• Research Institution: Okayama University
• Principal Investigator: YAMASHITA Shigeru 岡山大学, 地球物質科学研究センター, 准教授 (30260665)
• Research Collaborator: CHERTKOVA Nadezda 岡山大学, 大学院自然科学研究科
• Project Period (FY): 2012-04-01 – 2015-03-31
• Project Status: Completed (Fiscal Year 2014)
• Budget Amount: ¥4,940,000 (Direct Cost: ¥3,800,000、Indirect Cost: ¥1,140,000); Fiscal Year 2014: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000); Fiscal Year 2013: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000); Fiscal Year 2012: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
• Keywords: マグマ / 流体 / 高温高圧実験 / その場観察

Outline of Final Research Achievements

Feasibility of in situ observation of magmatic substance was assessed at high pressure and high temperature using an externally heated optical anvil cell. Moissanite was tested as possible high-temperature resistant anvil but no advantage of the moissanite to the regular diamond anvil was found under the controlled reduction-oxidation state near upper mantle conditions. In situ observation of an upper mantle magma analogue was performed using the regular diamond anvil, and the water speciation equilibrium in the melt state was successfully determined as function of pressure and temperature.

Research Products

• [Journal Article] High-pressure synthesis and application of 13C diamond pressure sensor for the experiments in a hydrothermal diamond anvil cell (2014)
  • Author(s): Nadezda Chertkova, Shigeru Yamashita, Eiji Ito, Akira Shimojuku
  • Journal Title: Mineralogical Magazine Volume: 78 Issue: 7 Pages: 1677-1685
  • DOI: 10.1180/minmag.2014.078.7.11
  • Peer Reviewed / Acknowledgement Compliant
• [Presentation] Solution mechanism of water in depolymerized silicate melts. (2014)
  • Author(s): Chertkova, N. and Yamashita, S.
  • Organizer: 日本地球惑星科学連合2014年大会
  • Place of Presentation: 横浜市
  • Year and Date: 2014-04-28 – 2014-05-02
  • Invited
• [Presentation] 新燃岳2011年噴火のデイサイトメルトへの水の溶解度
  • Author(s): 山下茂、Chertkova Nadezda
  • Organizer: 地球惑星科学連合2013年大会
  • Place of Presentation: 千葉県、幕張
• [Presentation] Determination of water speciation in hydrous Na2Si2O5 melt at high temperature and high pressure
  • Author(s): Nadezda Chertkova, Shigeru Yamashita
  • Organizer: IAVCEI 2013
  • Place of Presentation: Kagoshima, Japan