ボロン・ドープ・ダイヤモンドヒーターを用いた落球法シリケイトメルト粘性測定

2017 年度 実績報告書

• 研究課題/領域番号: 17J10966
• 研究機関: 岡山大学
• 研究代表者: XIE LONGJIAN 岡山大学, 自然科学研究科, 特別研究員(DC2)
• 研究期間 (年度): 2017-04-26 – 2019-03-31
• キーワード: viscosity / silicate melts / Magma ocean / boron doped diamond / high pressure / ultra-high temperature

研究実績の概要

We succeeded to extend the experimental measurements of silicate-melt viscosity up to about 30 GPa and more than 2500 K, by devising an in-situ falling sphere method coupled with boron-doped diamond heater and ultra-fast cameral (1000 f/s) in the multi-anvil apparatus. We determined viscosities of molten forsterite, enstatite and diopside from 5 to 30 GPa and at temperatures just above their liquidus. Melt viscosities of the three compositions are found very low, in the range of 0.01 to 0.1 Pa.s, at mantle pressure conditions. The extremely low viscosity implies a short life-time for the magma ocean (1-6 thousands years) and, potentially, a fractional crystallization.

現在までの達成度 (区分)

1: 当初の計画以上に進展している

理由

I developed the method to measure silicate melt viscosities up to 30 GPa and succeeded to measure viscosities of Fo, En and Di melt up to 30 GPa.

今後の研究の推進方策

I will measure viscosities of melt with CaMgSi2O6 composition at 25 and 30 GPa along the liquidus curve by in situ FSM at SPring-8. I will try to optimize the cell assembly to measure the viscosity of melt with pyrolite composition up to 30 GPa. I will invest ~20 % effort on experiments. I expect ~30 % effort on the analysis of experimental results. I will compare the experimental results with MD simulation results and prepare manuscript (~50 %).

研究成果

• [国際共同研究] Synchrotron SOLEIL(France)
  • 国名: フランス
  • 外国機関名: Synchrotron SOLEIL
• [雑誌論文] Synthesis of boron-doped diamond and its application as a heating material in a multi-anvil high-pressure apparatus (2017)
  • 著者名/発表者名: Xie Longjian、Yoneda Akira、Yoshino Takashi、Yamazaki Daisuke、Tsujino Noriyoshi、Higo Yuji、Tange Yoshinori、Irifune Tetsuo、Shimei Toru、Ito Eiji
  • 雑誌名: Review of Scientific Instruments 巻: 88 ページ: 093904～093904
  • DOI: https://doi.org/10.1063/1.4993959
  • 査読あり / 国際共著
• [雑誌論文] Single crystal elasticity of gold up to ~20 GPa: Bulk modulus anomaly and implication for a primary pressure scale (2017)
  • 著者名/発表者名: Yoneda Akira、Fukui Hiroshi、Gomi Hitoshi、Kamada Seiji、Xie Longjian、Hirao Naohisa、Uchiyama Hiroshi、Tsutsui Satoshi、Baron Alfred Q. R.
  • 雑誌名: Japanese Journal of Applied Physics 巻: 56 ページ: 095801～095801
  • DOI: https://doi.org/10.7567/JJAP.56.095801
  • 査読あり / 国際共著
• [学会発表] Fate of the magma ocean deduced from silicate melt viscosity. (2018)
  • 著者名/発表者名: Xie L. J., Yoneda A., Manthilake G., Yamazaki D., Higo Y., Tange Y., Guignot N., Andrault D.
  • 学会等名: PRIUS meeting of Geodynamic Research Center (GRC)
  • 招待講演
• [学会発表] Viscosity of silicate melts at high pressure measured by in-situ falling sphere method (2017)
  • 著者名/発表者名: Xie L. J., Yoneda A., Yamazaki D., Higo Y., Andrault D., Manthilake G., Boulard E., Guignot N.
  • 学会等名: JpGU
  • 国際学会
• [学会発表] Viscosity measurement of silicate melt up to the lower mantle conditions by in-situ falling sphere method (2017)
  • 著者名/発表者名: Xie L. J., Yoneda A.
  • 学会等名: invited talk at Bayerisches Geoinstitut (BGI)
  • 招待講演
• [学会・シンポジウム開催] JpGU (2017)