Effect of light element on rheology of hcp-iron: Structure and dynamics of the inner core

• Project/Area Number: 26287136
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Partial Multi-year Fund
• Section: 一般
• Research Field: Petrology/Mineralogy/Economic geology
• Research Institution: Okayama University
• Principal Investigator: Yamazaki Daisuke 岡山大学, 惑星物質研究所, 准教授 (90346693)
• Co-Investigator(Kenkyū-buntansha): 米田 明 岡山大学, 地球物質科学研究センター, 准教授 (10262841) ; 芳野 極 岡山大学, 地球物質科学研究センター, 准教授 (30423338)
• Project Period (FY): 2014-04-01 – 2017-03-31
• Project Status: Completed (Fiscal Year 2016)
• Budget Amount: ¥17,030,000 (Direct Cost: ¥13,100,000、Indirect Cost: ¥3,930,000); Fiscal Year 2016: ¥3,770,000 (Direct Cost: ¥2,900,000、Indirect Cost: ¥870,000); Fiscal Year 2015: ¥3,770,000 (Direct Cost: ¥2,900,000、Indirect Cost: ¥870,000); Fiscal Year 2014: ¥9,490,000 (Direct Cost: ¥7,300,000、Indirect Cost: ¥2,190,000)
• Keywords: 内核 / 拡散 / 粒成長 / 粒径 / 粘性 / 軽元素 / 高温高圧実験 / 粘性率 / ダイナミクス

Outline of Final Research Achievements

We determined the grain growth and diffusion rates of hcp iron and estimated the dominant deformation mechanism and viscosity of the inner core based on the experimental results. As a result, chemical heterogeneity is essential to interpret the observed heterogeneity between the eastern and western sides of the inner core in seismic attenuation. Moreover, we experimentally showed the small effect of Si on viscosity of hcp iron, indicating that light element(s) rather than Si may significantly affect the viscosity of the inner core.

Research Products

• [Journal Article] Silicon and oxygen self-diffusion in stishovite: Implications for stability of SiO2-rich seismic reflectors in the mid-mantle (2017)
  • Author(s): Xu, F., Yamazaki, D., Sakamoto, N., Sun, W., Fei, H. and Yurimoto, H.
  • Journal Title: Earth Planet. Sci. Lett. Volume: 459 Pages: 332-339
  • DOI: 10.1016/j.epsl.2016.11.044
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Grain growth of epsiron-iron: Implications to grain size and its evolution in the Earth’s inner core (2017)
  • Author(s): D. Yamazaki, N. Tsujino, A. Yoneda, E. Ito, T. Yoshino, Y. Tange, and Y. Higo
  • Journal Title: Earth and Planetary Science Letters Volume: 459 Pages: 238-243
  • DOI: 10.1016/j.epsl.2016.11.049
  • Peer Reviewed / Open Access
• [Journal Article] Mantle dynamics inferred from the crystallographic preferred orientation of bridgmanite (2016)
  • Author(s): N. Tsujino, Y. Nishihara, D. Yamazaki, Y. Seto, Y. Higo, E. Takahashi
  • Journal Title: Nature Volume: 539 Issue: 7627 Pages: 81-84
  • DOI: 10.1038/nature19777
  • NAID: 120006331948
  • Peer Reviewed / Open Access
• [Journal Article] Short-period cyclic loading system for in situ X-ray observation of anelastic properties at high pressure (2016)
  • Author(s): T. Yoshino, D. Yamazaki, Y. Tange, Y. Higo
  • Journal Title: Review of Scientific Instruments Volume: 87 Issue: 10 Pages: 105106-105106
  • DOI: 10.1063/1.4963747
  • Peer Reviewed
• [Journal Article] Strong tolerance of blue-green alga Microcystis flos-aquae to very high pressure (2015)
  • Author(s): Ono, F., Nishihira, N., Hada, Y., Mori, Y., Takarabe, K., Saigusa, M., Matsushima, Y., Yamazaki, D. and Ito, E.
  • Journal Title: J. Phys. Chem. Solids Volume: 84 Pages: 57-62
  • DOI: 10.1016/j.jpcs.2014.08.008
  • Peer Reviewed / Open Access
• [Journal Article] New constraints on upper mantle creep mechanism inferred from silicon grain-boundary diffusion rates (2015)
  • Author(s): Fei, H., Koizumi, S., Sakamoto, N., Hashiguchi, M., Yurimoto, H., Marquardt, K., Miyajima,N., Yamazaki, D. and Katsura, T.
  • Journal Title: Earth Planet. Sci. Lett. Volume: 433 Pages: 350-359
  • DOI: 10.1016/j.epsl.2015.11.014
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Electrical conductivity of brine-bearing quartzite at 1 GPa : implications for fluid content and salinity of the crust. (2014)
  • Author(s): Akira Shimojuku, Takashi Yoshino, Daisuke Yamazaki
  • Journal Title: Earth, Planets and Space Volume: (印刷中) Issue: 1 Pages: 1-9
  • DOI: 10.1186/1880-5981-66-2
  • Peer Reviewed / Open Access
• [Journal Article] Growth of ringwoodite reaction rims from MgSiO_3 perovskite and pericl ase at 22.5 GPa and 1800 ℃ (2014)
  • Author(s): Akira Shimojuku, Asmaa Boujibar, Daisuke Yamazaki, Takashi Yoshino, Naotaka Tomioka, Junshan Xu
  • Journal Title: Physics and Chemistry of Minerals Volume: (印刷中) Issue: 7 Pages: 555-567
  • DOI: 10.1007/s00269-014-0669-x
  • Peer Reviewed
• [Journal Article] High-Pressure phase transitions in FeCr204 and structure analysis of new post-spinel FeCr204 and Fe2Cr205 phases with meteoritical and petrological implications. (2014)
  • Author(s): T. Ishii, H. Kojitani, S. Tsukamoto, K. Fujino, D. Mori, Y. Inaguma, N. Tsujino, T. Yoshino, D. Yamazaki, Y. Higo, K. Funakoshi, M. Akaogi
  • Journal Title: American Mineralogist Volume: 403 Issue: 8-9 Pages: 1788-1797
  • DOI: 10.2138/am.2014.4736
  • Peer Reviewed
• [Journal Article] Interconnection of ferro-periclase controls subducted slab morphology at the top of the lower mantle (2014)
  • Author(s): D. Yamazaki, T. Yoshino, T. Nakakuki
  • Journal Title: Earth and Planetary Science Letters Volume: 403 Pages: 352-357
  • DOI: 10.1016/j.epsl.2014.07.017
  • Peer Reviewed
• [Journal Article] Seismic Attenuation Measurement by Cyclic Loading under High Pressure and Temperature (2014)
  • Author(s): Yoshino, T., Yamazaki, D., Higo, Y., Funakoshi, K.
  • Journal Title: The Review of High Pressure Science and Technology Volume: 24 Issue: 2 Pages: 126-135
  • DOI: 10.4131/jshpreview.24.126
  • NAID: 130004447679
  • ISSN: 0917-639X, 1348-1940
  • Peer Reviewed / Open Access
• [Journal Article] Electrical conductivity anisotropy in partially molten peridotite under shear deformation (2014)
  • Author(s): B. Zhang, T. Yoshino, D. Yamazaki, G. Manthilake, T. Katsura
  • Journal Title: Earth and Planetary Science Letters Volume: 405 Pages: 98-109
  • DOI: 10.1016/j.epsl.2014.08.018
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] Postperovskite Phase Transition of ZnGeO3: Comparative Crystal Chemistry of Postperovskite Phase Transition from Germanate Perovskites (2014)
  • Author(s): H. Yusa, T. Tsuchiya, M. Akaogi, H. Kojitani, D. Yamazaki, N. Hirao, Y. Ohishi, and T. Kikegawa
  • Journal Title: Inorganic Chemistry Volume: 53 Issue: 21 Pages: 11732-11739
  • DOI: 10.1021/ic501958y
  • Peer Reviewed
• [Journal Article] No effect of water on oxygen self-diffusion rate in forsterite. (2014)
  • Author(s): H. Fei, M. Wiedenbeck, D. Yamazaki, T. Katsura
  • Journal Title: Journal of Geophysical Research Volume: 119 Issue: 10 Pages: 7598-7606
  • DOI: 10.1002/2014jb011141
  • Peer Reviewed
• [Presentation] 焼結ダイヤモンドを用いた川井型装置による圧力発生 (2016)
  • Author(s): 山崎大輔
  • Organizer: 高圧討論会
  • Place of Presentation: つくば市
  • Year and Date: 2016-10-26
• [Presentation] Preliminary result on iron self-diffusion in ε-iron (2016)
  • Author(s): Daisuke YAMAZAKI, Naoya SAKAMOTO, Hisayoshi YURIMOTO
  • Organizer: 地球惑星関連連合大会
  • Place of Presentation: 千葉市
  • Year and Date: 2016-05-22
• [Presentation] Inner core dynamics inferred from grain growth of ε-iron (2015)
  • Author(s): Daisuke Yamazaki, Noriyoshi Tsujino, Takashi Yoshino, Eiji Ito, Yuji Higo, Yoshinori Tange
  • Organizer: AGU fall meeting
  • Place of Presentation: サンフランシスコ
  • Year and Date: 2015-12-16
  • Int'l Joint Research
• [Presentation] ペロフスカイトからポストペロフスカイトへの相転移における結晶方位関係 (2015)
  • Author(s): 山崎大輔、村上元彦、下宿彰、シューファン、瀬戸雄介、平尾直久
  • Organizer: 第56回高圧討論会
  • Place of Presentation: 広島市
  • Year and Date: 2015-11-12
• [Presentation] Inner core dynamics inferred from grain growth of ε-iron (2015)
  • Author(s): Daisuke YAMAZAKI, Noriyoshi TSUJINO, Akira YONEDA, Takashi YOSHINO, Yuji HIGO
  • Organizer: 地球惑星関連連合大会
  • Place of Presentation: 千葉、幕張
  • Year and Date: 2015-05-26
• [Presentation] 六方晶鉄の粒成長 (2014)
  • Author(s): 山崎大輔・辻野典秀・米田明・芳野極・肥後祐司
  • Organizer: 第55回高圧討論会
  • Place of Presentation: 徳島市
  • Year and Date: 2014-11-22
• [Presentation] アンチゴライトの非弾性的性質 (2014)
  • Author(s): 山崎大輔
  • Organizer: 地球惑星科学関連連合2014年大会
  • Place of Presentation: 横浜市
  • Year and Date: 2014-04-30