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Tomoaki KUBO Last modified date：2024.04.30

Professor / Material Science of Solar Planets
Department of Earth and Planetary Sciences
Faculty of Sciences


Graduate School
Department of Earth and Planetary Sciences
Graduate School of Sciences
Undergraduate School
Department of Earth and Planetary Sciences
School of Sciences
Other Organization
The Kyushu University Museum


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Homepage
https://kyushu-u.elsevierpure.com/en/persons/tomoaki-kubo
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https://www.geo.kyushu-u.ac.jp/english/index_e.html
Academic Degree
Doctor of Science
Country of degree conferring institution (Overseas)
No
Field of Specialization
Earth and Planetary Interiors, High-pressure Mineral physics
Total Priod of education and research career in the foreign country
00years06months
Outline Activities
We study dynamics of Earth and planetary interiors based on experimental mineral physics at high pressure. D-111 and D-DIA type high-pressure deformation apparatuses are used to study "deep rock dynamics" such as transformation kinetics, rheology, and their interactions in deep Earth materials and planetary ices, combined with AE measurements and in-situ X-ray observations at synchrotron facilities of SPring-8 and Photon Factory. Recent research topics include transformation-induced superplasticity and water weakening of deep slab, and transformation faulting and dehydration embrittlement for the origin of deep earthquakes, internal dynamics of icy moons, and non-equilibrium high-pressure transformations in shocked meteorites and diamond inclusions.
Research
Research Interests
  • Deep earthquakes and slab weakening induced by deep Earth water
    keyword : dehydration embrittlement, water weakening, serpentine, DHMS, fluid, water in NAMs
    2013.04.
  • Transformation-induced deep earthquakes and deep slab weakening
    keyword : mantle transition zone, transformational faulting, superplasticity, grain-size reduction, shear localization, shear instability
    2011.04.
  • Developments of in-situ observation method for the study of faulting, rheology and transformation kinetics in deep rock by using high-pressure deformation apparatus and synchrotron radiation
    keyword : MA-type high-pressure deformation experiment, synchrotron radiation, spatiotemporal resolution, AE measurement, bulk-rock dynamics, grain-scale dynamics
    2011.04.
  • Shocked meteorites and non-equilibrium transformations
    keyword : early solar system, parent body, shock history, formation of metastable phase, diamond inclusion
    2006.04.
  • Rheological properties of deep Earth rocks and planetary ices at high pressures
    keyword : plastic deformation, grain growth, atomic diffusion, mantle convection, icy moons
    2004.04.
  • Kinetics of high-pressure transformations in deep Earth rocks and planetary ices
    keyword : transformation mechanisms, transformation kinetics, slab stagnation, synchrotron radiation, electron microscopy
    2004.04.
Academic Activities
Reports
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Papers
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1. T. KUBO, T. Kato, Y. Higo, K. Funakoshi, Curious kinetic behavior in silica polymorphs solves seifertite puzzle in shocked meteorite, Sci. Adv. 1, e1500075 (2015). DOI: 10.1126/sciadv.1500075, 388, 2015.05.
2. N. Doi, T. Kato, T. Kubo, M. Noda, R. Shiraishi, A. Suzuki, E. Ohtani, T. Kikegawa, Creep behavior during the eutectoid transformation of albite: Implications for the slab deformation in the lower mantle, EARTH AND PLANETARY SCIENCE LETTERS, 10.1016/j.epsl.2013.09.009, 388, 92-97, 2014.02.
3. M. NIshi, Tomoaki KUBO, T. Ohfuji, Takumi Kato, Y. Nishihara, T. Irifune, Slow Si-Al interdiffusion in garnet and stagnation of subducting slabs, EARTH AND PLANETARY SCIENCE LETTERS, 10.1016/j.epsl.2012.11.022, 361, 44-49, 2013.01.
4. S. Kaneshima, T. Kubo, S. Yoshioka, Geophysical and mineralogical constraints on the post-spinel transformation for the Tonga slab, PHYSICS OF THE EARTH AND PLANETARY INTERIORS, 10.1016/j.pepi.2012.02.009, 196, 23-31, 2012.04.
5. M. Nishi, Tomoaki KUBO, Takumi Kato, A. Tominaga, K. Funakoshi, Y. Higo, Exsolution kinetics of majoritic garnet from clinopyroxene in subducting oceanic crust, PHYSICS OF THE EARTH AND PLANETARY INTERIORS, 10.1016/j.pepi.2011.07.002, 189, 1-2, 47-55, 2011.11.
6. M. Nishi, T. Kubo, T. Kato, A. Tominaga, A. Shimojuku, N. Doi, K. Funakoshi, Y. Higo, Survival of majoritic garnet in diamond by direct kimberlite ascent from deep mantle, Geophys. Res. Lett., 37, doi:10.1029/2010GL042706, 2010, 2010.05.
7. T. Kubo, T. Kondo, A. Shimojuku, T. Kuwabara, T. Kato, T. Kikegawa, N. Hirao, Y. Ohishi, Time-resolved two-dimensional X-ray diffraction measurements of kinetic properties in polycrystalline high-pressure ices, J. Phys. Conf. Ser., 215, 012022, 2010, 2010.03.
8. T. Kubo, M. Kimura, T. Kato, M. Nishi, A. Tominaga, T. Kikegawa, K. Funakoshi, Plagioclase breakdown as an indicator for shock conditions of meteorites, Nature geoscience, 3, 41-45, 2010, 2010.01.
9. T. Kubo, H. Nakata, T. Kato, Effects of insoluble particles on grain growth in polycrystalline ice: Implications for rheology of ice shells of icy satellites, J. Mineral. Petrol. Sci., 104, 301-306, 2009, 2009.10.
10. T. Kubo, S. Kaneshima, Y. Torii, S. Yoshioka, Seismological and experimental constraints on metastable phase transformations and rheology of the Mariana slab, Earth Planet. Sci. Lett., 287, 12-23, 2009, 2009.08.
11. Akira Shimojuku ,Tomoaki Kubo, Eiji Ohtani, Tomoki Nakamura, Ryuji Okazaki, Ralf Dohmen, Sumit Chakraborty, Si and O diffusion in (Mg,Fe)2SiO4 wadsleyite and ringwoodite and its implications for the rheology of the mantle transition zone, Earth Planet. Sci. Lett., 284, 103-112, 2009, 2009.05.
12. T. Kubo, E. Ohtani, T. Kato, T. Kondo, T. Hosoya, A. Sano, and T. Kikegawa, Kinetics of the post-garnet transformation: Implications for density and rheology of subducting slabs, Phys. Earth Planet. Inter., 170, 181-192, 2008, 2008.06.
13. Kubo, T., Durham, W. B., Stern, L. A., Kirby, S. H., Grain-size sensitive creep in ice II, Science, vol. 311, 1267-1269, 2006.01.
14. Hosoya, T., Kubo, T., Ohtani, E., Sano, A., Funakoshi, K., Water controls the fields of metastable olivine in cold subducting slabs, Geophys. Res. Lett., 10.1029/2005GL023398, 32, 17, vol. 32, doi:10.1029/2005GL023398, 2005.01.
15. Kubo, T., Ohtani, E., and Funakoshi, K., Nucleation and growth kinetics of the α-β transformation in Mg2SiO4 determined by in-situ synchrotron X-ray powder diffraction, American Mineralogist, 89, 285-293, 2004.01.
16. T. Kubo, E. Ohtani, T. Kondo, T. Kato, M. Toma, T. Hosoya, A. Sano, T. Kikegawa, and T. Nagase, Metastable garnet in oceanic crust at the top of the lower mantle, Nature, vol. 420, 803-806, 2002, 2002.01.
17. T. Kubo, E. Ohtani, T. Kato, S. Urakawa, A. Suzuki, Y. Kanbe, K. Funakoshi, W. Utsumi, T. Kikegawa and K. Fujino, Mechanisms and kinetics of the postspinel transformation in Mg2SiO4, Phys. Earth Planet. Inter., vol. 129, 153-171, 2002, 2002.01.
18. T. Kubo, E. Ohtani, T. Kato, S. Urakawa, A. Suzuki, Y. Kanbe, K. Funakoshi, W. Utsumi, and K. Fujino, Formation of metastable assemblages and mechanisms of the grain-size reduction in the postspinel transformation of Mg2SiO4, Geophysical Research Letters, vol. 27, 807-810, 2000, 2000.01.
19. T. Kubo, E. Ohtani, T. Kato, T. Shinmei, and K. Fujino, Effects of water on the α-β transformation kinetics in San Carlos olivine, Science, vol. 25, 695-698, 1998, 1998.01.
Presentations
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1. T. Kubo, H. Kojitani, S. Kaneshima, Y. Higo, Y. Tange, Kinetics of the two-stage post-spinel transformation under subduction zone conditions: Implications for mantle flow across the 660-km discontinuity, Japan Geoscience Union meeting 2018, 2018.05.
2. T. Kubo, N. Doi, M. Imamura, T. Kato, Y. Higo and Y. Tange, In-situ X-ray observations of creep behavior during the olivine-spinel transformation in fayalite, American Geophysical Union 2016 Fall Meeting, 2016.12.
3. 久保友明, 岩里拓弥, 肥後祐司, T. Kato, 上原 誠一郎, 金嶋 聰, Y. Tange, Simultaneous observations of reaction kinetics, creep behavior, and AE activities during syndeformational antigorite dehydration at high pressures, American Geophysical Union 2015 Fall Meeting, 2015.12.
4. 岩里拓弥, 久保友明, 肥後祐司, T. Kato, 金嶋 聰, 上原 誠一郎, Y. Tange, Flow behaviors and AE activities during syndeformational antigorite dehydration at high pressures, 日本地球惑星連合2015年度大会, 2015.05.
5. S. Wang, Tomoaki KUBO, J. Ning, Y. Higo, K. Funakoshi, In-situ XRD Study of the Olivine – Ringwoodite Phase Transformation Kinetics: Application for Effects of Water on Its Growth Kinetics, AGU Fall Meeting, 2012.12.
6. Tomoaki KUBO, Takumi Kato, Doi Naoko, Yuji Higo, Formation of metastable seifertite, Japan Geoscience Union Meeting 2012, 2012.05.
Awards
  • Masayuki NISHI, Tomoaki KUBO and Takumi KATO (2009) Metastable transformations of eclogite to garnetite in subducting oceanic crust. Journal of Mineralogical and Petrological Sciences, 104, 192-198.
Educational
Educational Activities
Introduction to Solid Earth and Deep Earth Materials Sciences
Introduction to Experimental Studies in Earth and Planetary Sciences
Rock and Mineral Physics
Synchrotron Radiation Studies in Earth and Planetary Sciences


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