Name: Hiraga, Takehiko
Position:Associate Professor
Division/Center: Division of Earth and Planetary Materials Science
Research Area: Mineral and rock physics
URL: http://www.eri.u-tokyo.ac.jp/hiragalab/index.html

Last Update 11/06 2014

Research:

Focusing on the physics and chemistry of minerals with an emphasis on the deformation behavior of mantle and crustal rocks.

Publications:

Hiraga, T., Nagase, T. and Akizuki, M., The structure of grain boundaries in granite-origin ultramylonite studied by high-resolution electron microscopy., Physics and Chemistry of Minerals, 26, 617--623, 1999.

Hiraga, T., Nishikawa, O., Nagase, T. and Akizuki, M. , Morphology of intergranular pores and wetting angles in pelitic schists studied by transmission electron microscopy, Contributions to Mineralogy and Petrology, 141, 613--622, 2001.

Hiraga, T., Nishikawa, O., Nagase, T., Akizuki, M. and Kohlstedt, D.L., Interfacial energies for quartz and albite in pelitic schists., Contributions to Mineralogy and Petrology, 143, 664--672, 2002.

Hiraga, T., Anderson, I.M., Zimmerman, M.E., Mei, S. and Kohlstedt, D.L. , Structure and chemistry of grain boundaries in deformed, olivine + basalt and partially molten lherzolite aggregates: Evidence of melt-free grain boundaries. , Contributions to Mineralogy Petrology, 144, 163--175, 2002.

Hiraga, T., Anderson, I.M. and Kohlstedt, D.L. , Chemistry of grain boundaries in mantle rocks., American Mineralogist, 88, 1015--1019, 2003.

Hiraga, T., Anderson, I.M. and Kohlstedt, D.L., Grain boundaries as reservoirs of incompatible elements in the Earth's mantle. , Nature, 427, 699--703, 2004.

Hiraga, T., Kohlstedt, D.L., Equilibrium interface segregation in the diopside-forsterite system I: Analytical techniques, thermodynamics, and segregation characteristics, Geochimica et Cosmochimica Acta, 71, 1266--1280, 2007.

Hiraga, T., Hirschmann, M.M. and Kohlstedt, D.L., Equilibrium interface segregation in the diopside-forsterite system II: Applications of interface enrichment to mantle geochemistry. , Geochimica et Cosmochimica Acta, 71, 1281--1289, 2007.

Hiraga, T. and Kohlstedt, D.L., Systematic distribution of incompatible elements in mantle peridotite: Importance of intra- and inter-granular melt-like components, Contrib. Mineral. Petrol., 158, 149--167, 2009.

Hiraga, T., Tachibana, C., Ohashi, N. and Sano, S., Grain growth systematics for forsterite enstatite aggregates: effect of lithology on grain size in the upper mantle, Earth Planet. Sci. Lett., 291, 10--20, 2010.

Koizumi, S., Hiraga, T., Tachibana, C.,Tasaka, M., Miyazaki, T., Kobayashi, T., Takamasa, A., Ohashi, N. and Sano, S., Synthesis of highly dense and fine-grained aggregates of mantle composites by vacuum sintering of nano-sized mineral powders, Physics and Chemistry of Minerals, 37, 505--518, 2010.

Hiraga, T., T. Miyazaki, T., M. Tasaka and H. Yoshida, Mantle superplasticity and its self-made demise, Nature, 468, 1091--1095, 2010.

ʿɧٻˡܺһ, γήΤμ, ϵ岽, 46, 231--242, 2012.

Tasaka, M. and Hiraga, T. , Influence of mineral fraction on the rheological properties of forsterite + enstatite during grain size sensitive creep 1: Grain size and grain growth laws. , J. Geophys. Res., 118, 3970--3990, 2013.

Tasaka, M., Hiraga, T. and Zimmerman, M.E. , Influence of mineral fraction on the rheological properties of forsterite + enstatite during grain size sensitive creep 2: Deformation experiments, J. Geophys. Res., 118, 3991--4012, 2013.

Hiraga, T., Miyazaki, T. Yoshida, H. and Zimmerman, M.E., Comparison of microstructures in superplastically deformed synthetic materials and natural mylonites: Mineral aggregation via grain boundary sliding, Geology, 41, 9, 959--962, 2013.

Miyazaki, T., Sueyoshi, K. and Hiraga T., Olivine crystals alignduring diffusion creep of Earths upper mantle, Nature, 502, 321--326, 2013.

Tasaka, M., Hiraga, T. and Michibayashi, K., Influence of mineral fraction on the rheological properties of forsterite + enstatite during grain size sensitive creep: 3 Application of grain growth and flow laws on peridotite ultramylonite, J. Geophys. Res., 119, 840--857, 2014.