Site map
Exhibitions

Associate　Professor:Toshiro Nagase

Associate　Professor:Toshiro Nagase

Associate　Professor:Toshiro Nagase

Research field

Mineralogy

Research Interest

  •  Ontogeny of minerals by analyses of internal textures of crystals. · Nucleation and growth processes of minerals under metastable condition.
  •  Personal Page

Papers

Selected papers
  1. Kawasaki, M., Nagase, T., Onuma, K., Katsumata, T., Sunagawa, I. (2006) Appearance of basal faces in natural amethyst crystals from Four Peaks, Arizona. European Journal of Mineralogy, 18, 273-278.
  2. Asahara, Y., Ohtani, E., Kondo, T., Kubo, T., Miyajima, N., Nagase, T., Fujino, K., Yagi, T., and Kikegawa, T. (2005) Formation of metastable cubic-perovskite in high-pressure phase transformation of Ca(Mg,Fe,Al)Si2O6. Amer. Mineral., 90, 457-462.
  3. Kobayashi, Y., Kondo, T., Ohtani, E., Hirao, N., Miyajima, N., Yagi, T., Nagase, T., and Kikegawa, T. (2005) Fe-Mg partitioning between (Mg, Fe)SiO3 t-perovskite, perovskite, and magnesiowuestite in the Earth's lower mantle. Geophys. Res. Lett., 32, L19301.
  4. H. Sasaki, A. Tanaka, Y. Kuriyama, T. Nagasawa, S. Suzuki, S. Sato, and T. Nagase (2004) Angle-resolved photoemission study of CoSi2 nanofilms grown on Si(111) substrates. Solid State Commun. 121, 91-95.
  5. K. Otsuki, N. Monzawa, T. Nagase (2003) Fluidization and melting of fault gouge during seismic slip: Identification in the Nojima fault zone and implications for focal earthquake mechanisms. Journal of Geophysical Research, 108(B4), 2192-2208.
  6. T. Nagase, M. Abiko, M. Tanaka (2002) Quantitative analyses of Brazil twin defects in chalcedony by X-ray powder diffraction method. KEK Progress Report 2002-2.
  7. T. Kubo, E. Ohtani, T. Kondo, T. Kato, M. Toma, T. Hoaoya, A. Sano, T. Kikegawa, T. Nagase (2002) Metastable garnet in oceanic crust at the top of the lower mantle, Nature, 429, 803-806.
  8. T. Nagase, M. Abiko, and Y. Kudoh (2002) Texture and morphology of submicron-sized quartz crystals with moganite synthesized by hydrothermal experiment, International Mineralogical Association general meeting, Abstract and Program, 115.
  9. Akizuki, M., Kuribayashi, T., Nagase, T. and Kitakaze A. (2001) Triclinic liddicaotite and elbaite in growth sectors from Madagascar, American Mineralogist, 86, 364-369.
  10. T.Hiraga, O. Nishikawa, T.Nagase, M.Akizuki (2001) Morphology of intergranular pores and wetting angles in pelitic schists studied by transmission electron microscopy, Contrib. Mineral. Petrol. 141, 613-622.
  11. T. Nagase, T. Nishihori, A. Kitakaze, M. Akizuki (1999) High resolution TEM observations of micro-texture in arsenopyrite, Geological Society of America annual meeting, Abstract and Program, A-400.
  12. T. Hiraga, T. Nagase and M. Akizuki (1999) The structure of grain boundaries in granite-origin ultramylonite studied by high-resolution electron microscopy, Physics and Chemistry of Minerals, 36, 617-623.
  13. Ohtani, E., H. Mizobata, Y. Kudoh, T. Nagase, H. Arashi, H. Yurimoto and I. Miyagi (1998) Reply, Geophys. Rearch Lett., 25, 981-982.
  14. Kudoh, Y., Kuribayashi, T., Nagase, T., Sasaki, S. and Tanaka, M. (1998) Crystal Structure of Chondrodite at 5.5 GPa, KEK Report, 97G218
  15. Kudoh, Y., T. Nagase, H. Mizobata, E. Ohtani, S. Sasaki and M. Tanaka (1998) Possible sites of hydrogen in a new hydrous magnesium silicate phase G synthesized at 22 GPa and 1050C, Rev. High Pressure Sci. Technol., 7, 134-136.
  16. Nagase, T., and M. Akizuyki (1998) TEM obserbations of disordereded domain in marcasite from Ikezuki, Japan, and Potoshi, Bolivia. International Mineralogical Association, 17th General Meeting, Abstracts, A86.
  17. Y. Kudoh, T. Nagase, H. Mizohata, E. Ohtani, S. Sasaki and M. Tanaka (1997): Structure and crystal chemistry of phase G, a new hydrous magnesium silicate synthesized at 22 GPa and 1050 ?C. Geophys. Res. Lett., 24, 1051-1054.
  18. Y. Kudoh, T. Nagase, H. Mizohata, E. Ohtani, S. Sasaki and M. Tanaka (1997) Crystal structure of phase G synthesized at 22 GPa and 1050 ?C. KEK Progress Report, 97-2, 190.
  19. E. Ohtani, H. Mizobata, Y. Kudoh, T. Nagase, H. Arashi, H. Yurimoto and I. Miyagi (1997) A new hydrous silicate, a water reservoir, in the upper part of the lower mantle. Journal of Geophysical Research, 24, p.1047-1050.
  20. T. Nagase, M. Akizuki and S. Kojima (1997) High resolution electron microscope observations of natural wurtzite. Geological Society of America annual meeting, Abstract and Program, A-400.
  21. T. Nagase and M. Akizuki (1997) Texture and structure of opal-CT and opal-C in volcanic rocks. Canadian Mineralogist, 35, p.947-958.
  22. T. Nagase, M. Akizuki, M. Onoda and M. Sato (1997) Chrysoprase of Warawanda, West Australia. Neues Jahrbuch fur Mineralogie, Monatshefte, p.289-300.
  23. T. Nagase and S. Kojima (1997) An SEM examination of the chalcopyrite disease texture and its genetic implications. Mineralogical Magazine, 61, p.89-97.
  24. Y. Kudoh, T. Nagase, S. Sasaki, M. Kanzaki and M. Tanaka (1996) On the accuracy of X-ray diffraction intensities of a small single crystal of hydrous magnesium silicate measured with a four-circle diffractometer using a diamond anvil high pressure cell. KEK Progress Report, 96-3, p.148.
  25. S. Kojima, T. Nagase and T. Inoue (1995)A coprecipitation experiment on the chalcopyrite disease texture involving Fe-bearing sphalerite. Journal of Mineralogy, Petrology and Economic Geology, 90, p.261-267.
  26. Y. Kudoh, T. Nagase, S. Ohta, S. Sasaki, M. Kanzaki and M. Tanaka (1994) Crystal structure and compressibility of superhydrous phase B, Mg20Si6H8O36 using a diamond anvil and single crystal X-ray diffraction method. KEK Progress Report, 94-1, p.199.
  27. Y. Kudoh, T. Nagase, S. Ohta, S. Sasaki, M. Kanzaki and M. Tanaka (1994) Crystal structure and compressibility of superhydrous phase B, Mg20Si6H8O36. High Pressure Science and Technology-1993, edited by Sctaner, S.C., Samara, G.A. and Ross, M., p.469-472, American Institute of Physics.
  28. Y. Kudoh, T. Nagase., S. Ohta, S. Sasaki, M. Kanzaki and M. Tanaka (1993) Crystal structure analysis of fluorite, CaF2 at 7GPa using a diamond anvil and single crystal X-ray diffraction method. KEK Progress Report, 93-1, p.214.
  29. H. Nakai and T. Nagase (1991) Improvement of mechanical properties of thin film coated glass. Proceedings of International Conference on Science and Technology of New Glasses, p.141-146.
  30. The study of fine-grained interstice filling materials in chondrule and the fine-grained rim within Cold Bokkeveld chondrite by FIB-TEM/STEM. [Meteoritics & Planetary Science,42,(2007), A110] Miyahara M., Uehara S., Ohtani E., Nagase T. and Kitagawa R. ,
  31. Miyahara M., Sakai T., Kobayashi Y., Ohtani E., Kondo T., Nagase T., Yoo J.-H., Nishijima M. and Vashaei Z.,　Application of FIB system to ultra-high pressure Earth science. Journal of Mineralogical and Petrological Sciences, 103,.88-93, 2008.
  32. Miyahara M., El Goresy A., Ohtani E., Ozawa S., Nagase T. and Nishijima M., Fractional crystallization of olivine melt inclusions in a shock-induced chondritic melt vein.[Annual report of Bayerisches Forschungsinstitut fur Experimentelle Geochemie und Geophysik, Universitat Bayreuth,(2008),162-165]
  33. Miyahara M., El Goresy A., Ohtani E., Nagase T., Nishijima M., Vashaei Z., Ferroir T., Gillet P., Dubrovinsky L. and Simionovici A., Evidence for fractional crystallization of wadsleyite and ringwoodite from olivine melts in chondrules entrained in shock-melt veins.[Proceedings of the National Academy of Sciences,105,(2008),8542-8547]
  34. Miyahara M., Kimura M., Ohtani E., El Goresy A., Ozawa S., Nagase T. and Nishijima M., Further evidence for ubiquitous fractional crystallization of wadsleyite and ringwoodite from olivine melt.[Meteoritics & Planetary Science,43,(2008),A102]
  35. Momma K., Nagase T., Kuribayashi T. and Kudoh Y. (2009) Computational simulations of the structure of Japanese twin boundaries in quartz, Eur. J. Mineral., 21 373-383.
  36. Miyahara, M., El Goresy, A., Ohtani, O., Kimura, M., Ozawa, S., Nagase, T., Nishijima, M., (2009) Fractional crystallization of olivine melt inclusion in shock-induced chondritic melt vein, Physics of the Earth and Planetary Interiors,177, 3-4 116-121
  37. Miyahara M., Ohtani E., Kimura M., El Goresy A., Ozawa S. and Nagase T. (2009) Detailed FIB-TEM study of ringwoodite lamellae in individual olivine grains in shock-melt veins of Yamato 791384 L6 chondrite. Meteoritics & Planetary Science 44 (Supplement), A145, 2009.
  38. El Goresy A., Miyahara M., Ohtani E., Nagase T., Nishijima M., Ferroir T. and Gillet Ph. (2009) Micro-surgical FIB-TEM study of diverse liquidus wadsleyite-ringwoodite pairs fractionally crystallized from olivine melt enclaves in shock melt veins in L6 chondrites. Meteoritics & Planetary Science 44 (Supplement), A79, 2009.El Goresy A., Miyahara M., Ohtani E., Ozawa S., Nagase T. and Nishijima M. , (2009) First natural occurrence of ringwoodite exsolution lamellae in fractionally crystallized Mg-rich wadsleyite from shock-induced olivine melts in L6 chondrites.[Annual report of Bayerisches Forschungsinstitut fur Experimentelle Geochemie und Geophysik, Universitat Bayreuth,(2009),158-162]
  39. Miyahara M., Ohtani E., Kimura M., El Goresy A., Ozawa S., Nagase T., Nishijima M. and Hiraga K (2009) Coherent ringwoodite growth in olivine of Yamato 791384 L6 chondrite.[Annual report of Bayerisches Forschungsinstitut fur Experimentelle Geochemie und Geophysik, Universitat Bayreuth, (2009),162-164].
  40. El Goresy A., Miyahara M., Ohtani E., Nagase T., Nishijima M., Ferroir T. and Gillet Ph. (2009) Micro-surgical FIB-TEM study of diverse liquidus wadsleyite-ringwoodite pairs fractionally crystallized from olivine melt enclaves in shock melt veins in L6 chondrites.[Meteoritics & Planetary Science,44 ,A79]
  41. Miyahara M., Ohtani E., Kimura M., El Goresy A. Ozawa S., Nagase T., Nishijima M. and Hiraga K. Coherent and subsequent incoherent ringwoodite growth in olivine of shocked L6 chondrites. [Earth and Planetary Science Letter, 295, (2010),321-327]
  42. Miyahara M., Ohtani E., Kimura M., Ozawa S., Nagase T., Nishijima M. and Hiraga K. Melting and subsequent decompression processes recorded in a shock vein of an L6 chondrite. [Meteoritics & Planetary Science, 45, (2010), A140]
  43. Feng L., Miyahara M., Lin Y., Ohtani E., E. Goresy A., Nagase T.. and Hu S. ,First evidence for multi shock events on the L chondritic parent body. [Meteoritics & Planetary Science, 45,(2010), A53]
  44. El Goresy A., Miyahara M., Ozawa S., Ohtani E., Gillet Ph., Beck P. Montagnac G., Nagase T. and Hiraga K. (2010) Liquidus high-pressure assemblages in shocked Martian shergottites: constrains to equilibrium peak shock-pressures and consequences to radiometric ages.[Meteoritics & Planetary Science,45,(2010),A50]