国際的パルス中性子施設と巨大高圧相単結晶合成技術による地球深部水の研究

• Project/Area Number: 15J03633
• Research Category: Grant-in-Aid for JSPS Fellows
• Allocation Type: Single-year Grants
• Section: 国内
• Research Field: Petrology/Mineralogy/Economic geology
• Research Institution: Okayama University
• Principal Investigator: プレジャブ ナランゴー 岡山大学, 自然科学研究科, 特別研究員(DC2)
• Project Period (FY): 2015-04-24 – 2017-03-31
• Project Status: Completed (Fiscal Year 2016)
• Budget Amount: ¥1,900,000 (Direct Cost: ¥1,900,000); Fiscal Year 2016: ¥900,000 (Direct Cost: ¥900,000); Fiscal Year 2015: ¥1,000,000 (Direct Cost: ¥1,000,000)
• Keywords: neutron diffraction / mantle transition zone / single crystal / hydrous ringwoodite / hydrous wadsleyite

Outline of Annual Research Achievements

We conducted series of measurements of quasi-elastic neutron scattering for dense hydrous magnesium silicate phase E. These were made several times during this period until February 2017. The sample with about 250 mg in total mass was successfully synthesized at 15 GPa pressure by using Kawai-type apparatus at Okayama University. The measurement was conducted at DNA spectrometer at J-PARC. The method was applied for observing hydrogen diffusion in atomic scale in the host mineral structure. We measured it at variable temperature ranges up to 480 K. We successfully observed local motions of hydrogen in the crystal structure of phase E. On the other hand, I also joined several conferences. I presented my results of structure refinements for hydrous ringwoodite and hydrous wadsleyite. The result for hydrous wadsleyite by single crystal neutron diffraction has been published in Scientific Reports in 2016 October. The result for hydrous ringwoodite by single crystal neutron diffraction (obtained previously in 2015 at TOPAZ spectrometer at Spallation Neutron Source, Oak Ridge National Laboratory) has been analyzed and also presented in these conferences. Finally I wrote my Ph.D dissertation and submitted it in early March.

Research Progress Status

28年度が最終年度であるため、記入しない。

Strategy for Future Research Activity

28年度が最終年度であるため、記入しない。

Research Products

• [Int'l Joint Research] オークリッジ国立研究所(米国)
• [Int'l Joint Research] Oak Ridge National Laboratory(米国)
• [Journal Article] Quantitative analysis of hydrogen sites and occupancy in deep mantle hydrous wadsleyite using single crystal neutron diffraction (2016)
  • Author(s): Narangoo Purevjav, Takuo Okuchi, Naotaka Tomioka, Xiaoping Wang and Christina Hoffmann
  • Journal Title: Scientific Reports Volume: 6 Issue: 1 Pages: 34988-34988
  • DOI: 10.1038/srep34988
  • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] Hydrogen Site Analyses of Dense Hydrous Mantle Minerals by Pulsed Neutron Powder Diffraction (2016)
  • Author(s): 奥地拓生・富岡尚敬・プレジャブナランゴー
  • Journal Title: The Review of High Pressure Science and Technology Volume: 26 Issue: 2 Pages: 140-148
  • DOI: 10.4131/jshpreview.26.140
  • NAID: 130005158545
  • ISSN: 0917-639X, 1348-1940
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Presentation] Single crystal neutron diffraction of hydrous wadsleyite and the reason of sensitivity difference for hydration between upper and lower mantle transition zones (2016)
  • Author(s): Narangoo Purevjav, Takuo Okuchi, Naotaka Tomioka, Xiaoping Wang and Christina Hoffmann
  • Organizer: American Geophysical Union 2016 Fall Meeting
  • Place of Presentation: Moscone center
  • Year and Date: 2016-12-12
  • Int'l Joint Research
• [Presentation] Structure analysis of hydrous ringwoodite by single crystal neutron diffraction (2016)
  • Author(s): Narangoo Purevjav, Takuo Okuchi, Xiaoping Wang and Christina Hoffmann
  • Organizer: The 57th High Pressure Conference of Japan
  • Place of Presentation: University Hall, Tsukuba University
  • Year and Date: 2016-10-26
• [Presentation] Hydrogen site analysis of hydrous ringwoodite in mantle transition zone by pulsed neutron diffraction (2016)
  • Author(s): Narangoo Purevjav, Takuo Okuchi and Naotaka Tomioka
  • Organizer: Goldschmidt2016
  • Place of Presentation: Pacifico Yokohama
  • Year and Date: 2016-06-26
  • Int'l Joint Research
• [Presentation] Hydrogen in hydrous wadsleyite analyzed by time-of-flight single crystal neutron diffration (2016)
  • Author(s): Purevjav, N., Okuchi, T., Tomioka, N., Wang, X. P., Hoffmann, C.
  • Organizer: Misasa International Symposium MISASA VI “Frontiers in Earth and Planetary Materials Research: Origin, Evolution and Dynamics”
  • Place of Presentation: Blanc Art Misasa
  • Year and Date: 2016-03-08
  • Int'l Joint Research
• [Presentation] Hydrogen sites in the deep mantle hydrous ringwoodite determined by neutron single-crystal Laue diffraction (2015)
  • Author(s): Purevjav, N., Okuchi, T., Hoffmann, C., Wang, X.P.
  • Organizer: 日本中性子科学会
  • Place of Presentation: 和光市民文化センター
  • Year and Date: 2015-12-10