Hideharu Kuwahara (桑原秀治)

Manuscripts in progress

Wood, M., S. Greaux, Y. Kono, S. Kakizawa, Y. Ishikawa, S. Inoue, H. Kuwahara, T. Irifune, Sound velocities in lunar mantle aggregates at simultaneous high pressures and temperatures: Implications for the presence of garnet in the deep lunar interior, accepted in Earth and Planetary Science Letters.

Inada, M., Y. Okuda, K. Oka, H. Kuwahara, S. Greaux, K. Hirose, Electrical conductivity of superionic hydrous silica explains Earth's lower mantle conductivity beneath subduction zones, in revision.

Kawano, K., M. Nishi, H. Kuwahara, S. Kakizawa, T. Inoue, T. Kondo, Extensive iron-water exchange at Earth's core-mantle boundary explains seismic anomalies, submitted.

Kono, Y., C. Koyama, N. M. Kondo, K. Ohara, H. Kuwahara, R. Nakada, Y. Watanabe, H. Oda, T. Ishikawa, Dense iron-rich peridotitic melt explains molten silicate layer above Earth's and Mars's core, submitted.

Peer-reviewed articles

Selected publications

Kuwahara, H., R. Nakada, S. Kadoya, T. Yoshino, T. Irifune (2023), Hadean mantle oxidation inferred from melting of peridotite under lower mantle conditions, Nature Geoscience 16, 461-465.

Kuwahara, H., R. Nakada (2023), Partitioning of Fe2+ and Fe3+ between bridgmanite and silicate melt: Implications for redox evolution of the Earth's mantle, Earth and Planetary Science Letters 615, 118197.

Kuwahara, H., S. Itoh, A. Suzumura, R. Nakada, T. Irifune (2021), Nearly carbon-saturated magma oceans in planetary embryos during core formation, Geophysical Research Letters 48, e2021GL092389.

[19] Sano, Y., Y. Koyama, N. Takahata, M. Koike, M. K. Haba, S. Sakata, H. Kuwahara, T. Irifune (2024), Hf-W dating of zircon in mesosiderite with high-pressure sintered standard, Journal of Analytical Science and Technology, 15, 24.

[18] Jing, J.-J., B.-X. Su, J. Berndt, H. Kuwahara, W.-V. Westrenen, Experimental investigation of first-row transition elements partitioning between olivine and silicate melt: Implications for lunar basalt formation, Geochimica et Cosmochimica Acta, 373, 211-231.

[17] Kuwahara, H. (2024), Partial melt composition of enstatite chondritic mantle around the rheological transition at 23 GPa: Implications for the chemical differentiation of the Earth's mantle, Physics of the Earth and Planetary Interiors 346, 107123.

[16] Nishi, M., S. Jin, T. Kawano, H. Kuwahara, A. Yamada, Y. Mori, T. Sakaiya, T. Kondo (2023), Effect of grain size on amorphization mechanism and kinetics of bridgmanite in shocked meteorites, Progress in Earth and Planetary Science 10, 41.

[15] Kono, Y., H. Kuwahara, S. Gréaux, M. Rivers, Y. Wang, Y. Higo, K. Mitsu, M. Kondo (2023), Strong effect of liquid Fe-S on elastic wave velocity of olivine aggregate: implication for the low velocity anomaly at the base of the lunar mantle, Earth and Planetary Science Letters 618, 118287. * contributed as a corresponding author

[14] Kuwahara, H., R. Nakada (2023), Partitioning of Fe2+ and Fe3+ between bridgmanite and silicate melt: Implications for redox evolution of the Earth's mantle, Earth and Planetary Science Letters 615, 118197.

[13] Kuwahara, H., R. Nakada, S. Kadoya, T. Yoshino, T. Irifune (2023), Hadean mantle oxidation inferred from melting of peridotite under lower mantle conditions, Nature Geoscience 16, 461-465. News & Views

[12] Xu, F., N. Siersch, S. Gréaux , A. Rivoldini, H. Kuwahara, N. Kondo, N. Wehr, N. Menguy, Y. Kono, Y. Higo, A.-C. Plesa, J. Badro, D. Antonangeli (2021) Low velocity zones in the Martian upper mantle highligted by sound velocity measurements, Geophysical Research Letters 48, e2021GL093977.

[11] Kono, Y., Y. Higo, S. Gréaux, Y. Shibazaki, R. Yamada, H. Kuwahara, N. Kondo (2021) Continuous measurement of ultrasonic elastic wave velocities, X-ray radiography and X-ray diffraction of Zr50Cu40Al10 metallic glass at high pressure and high temperature conditions, High Pressure Research.

[10] Kuwahara, H., S. Itoh, A. Suzumura, R. Nakada, T. Irifune (2021) Nearly carbon-saturated magma oceans in planetary embryos during core formation, Geophysical Research Letters 48, e2021GL092389.

[9] Xu, C., S. Gréaux, T. Inoue, M. Noda, W. Sun, H. Kuwahara, Y. Higo, Sound velocities of Al-bearing phase D to 22 GPa and 1300 K, Geophysical Research Letters 46, e2020GL088877.

[8] Gaida, N. A., S. Gréaux , Y. Kono, H. Ohfuji, H. Kuwahara, N. Nishiyama, O. Beermann, T. Sasaki, K. Niwa, M. Hasegawa, Elasticity of transparent low-symmetry nano-polycrystalline kyanite at extreme conditions of pressure and temperature determined by using ultrasonic and synchrotron X-ray techniques, Journal of the American Ceramic Society, in press.

[7] Kuwahara, H., S. Itoh, R. Nakada, T. Irifune (2019), The effects of carbon concentration and silicate composition on the metal-silicate partitioning of carbon in a shallow magma ocean, Geophysical Research Letters 46, 9422-9429.

[6] Kuwahara, H., T. Kagoshima, R, Nakada, N. Ogawa, A. Yamaguchi, Y. Sano, T. Irifune (2019), Fluorine and chlorine fractionation during magma ocean crystallization: Constraints on the origin of non-chondritic F/Cl ratio of the Earth, Earth and Planetary Science Letters 520, 241-249.

[5] Kuwahara, H., R. Nomura, R. Nakada, T. Irifune (2018), Simultaneous determination of melting phase relations of mantle peridotite and mid-ocean ridge basalt at the uppermost lower mantle conditions, Physics of the Earth and Planetary Interiors 284, 36-50.

[4] Kuwahara, H., H. Gotou, T. Shinmei, N. Ogawa, A. Yamaguchi, N. Takahata, Y. Sano, T. Yagi, S. Sugita (2017), High pressure experiments on metal-silicate partitioning of chlorine in a magma ocean: Implications for terrestrial chlorine depletion, Geochemistry, Geophysics, Geosystems.

[3] Kuwahara, H., S. Sugita (2015), The molecular composition of impact-generated atmospheres on terrestrial planets during the post-accretion stage, Icarus 257, 290-301.

[2] Kuwahara, H., H. Kurihara, T. Kaneko, Y. Obayashi, K. Kobayashi (2012), The Use of Ascorbate as an Oxidation Inhibitor in Prebiotic Amino Acid Synthesis: A Cautionary Note, Orig. Life Evol. Biosph., 42, 533-541.

[1] Suzuki, A., S. Hakura, T. Hamura, M. Hattori, R. Hayama, T. Ikeda, H. Kusuno, H. Kuwahara, Y. Muto, K. Nagaki, R. Niimi, Y. Ogata, T. Okamoto, T. Sasamori, C. Sekigawa, T. Yoshihara, S. Hasegawa, K. Kurosawa, T. Kadono, A. M. Nakamura, S. Sugita, M. Arakawa (2012), Laboratory experiments on crater scaling-law for sedimentary rocks in the strength regime, J. Geophys. Res., 117, E08012.

Selected international conference abstracts

Kuwahara, H., S. Itoh, R. Nakada, T. Irifune (2018), Metal-silicate partitioning of carbon in a shallow magma ocean: Implications for the distribution of carbon in the Earth during the core formation, Japan Geoscience Union Meeting 2018, Chiba, Japan. [Oral]

Kuwahara, H., S. Itoh, R. Nakada, T. Irifune (2018), Liquid metal-silicate partitioning of carbon in a magma ocean during the core formation of terrestrial planets, MEXT Grand-in-Aid for Scientific Research on Innovative Areas: Interaction and Coevolution of the Core and Mantle Toward Integrated Deep Earth Science International Symposium and Annual General Meeting , Matsuyama, Japan. [Oral]

Kuwahara, H., N. Ogawa, A. Yamaguchi, T. Kagoshima, Y. Sano, T. Irifune (2017), Fluorine and chlorine fractionation during magma ocean solidification: Implications for the origin and abundance of terrestrial halogens, Japan Geoscience Union Meeting 2017, Chiba, Japan. [Poster]

Kuwahara, H., H. Gotou, N. Ogawa, A. Yamaguchi, N. Takahata, Y. Sano, T. Yagi, S. Sugita (2016), Metal-silicate partitioning of chlorine in a magma ocean: Implications for the origin of chlorine depletion on Earth, Japan Geoscience Union Meeting 2016, Chiba, Japan. [Oral]

Kuwahara, H., H. Gotou, N. Ogawa, A. Yamaguchi, T. Yagi, S. Sugita (2015), Metal-silicate partitioning of chlorine: Implications for the origin of terrestrial missing chlorine, The Earth’s Mantle and Core: Structure, Composiition, Evolution, Matsuyama, Japan. [Oral]

Kuwahara, H., S. Sugita (2014), The molecular composition of terrestrial planetary atmospheres of impact origin during post-accretion stage, 2nd The International Astrobiology Society and Bioastronomy Joiny International Conference, Nara, Japan. [Poster]

Kuwahara, H., S. Sugita (2014), Impact generation of methane-rich atmospheres on early terrestrial planets, 45th Lunar and Planetary Science Conference, Houston, US. [Poster]

Kuwahara, H., S. Sugita (2013), Methan-rich impact-induced atmospheres on Mars and post-accretion Earth, 44th Lunar and Planetary Science Conference, Houston, US. [Poster]

Kuwahara, H., H. Kurihara, T. Kaneko, Y. Obayashi, K. Kobayashi (2011), Formation of amino acids in non-reducing gas mixtures, 11th European Workshop on Astrobiology, Colongne, Germany. [Oral]

邦文査読付き解説記事

桑原秀治, 野村龍一, 中田亮一, 入舩徹男 (2019), 下部マントル最上部条件におけるカンラン岩と中央海嶺玄武岩の融解相関係とその部分溶融層の重力的安定性, 高圧力の科学と技術 (日本高圧力学会誌), 29, 75-85. URL: https://www.jstage.jst.go.jp/article/jshpreview/29/2/29_75/_article/-char/ja/

杉田精司, 桑原秀治, 黒澤耕介 (2015), 超高速衝突実験が明らかにした衝突蒸発現象・化学反応過程, 遊星人 (日本惑星科学会誌), 24, 181-190. URL: https://www.jstage.jst.go.jp/article/yuseijin/24/3/24_KJ00010076986/_article/-char/ja/

その他

桑原秀治 (2015), 「天体の衝突物理の解明(X)～日本の衝突研究の未来～」参加報告, 遊星人 (日本惑星科学会誌), 24, 65-68. URL: https://www.jstage.jst.go.jp/article/yuseijin/24/1/24_KJ00009871234/_article/-char/ja/