略歴

平成6年3月 　　岐阜県立可児高等学校卒業

平成6年4月 　　東京大学理科II類入学

平成10年3月 　　同大学理学部地質学専攻卒業

平成10年4月　　 東京大学大学院理学系研究科地質学専攻　修士課程進学

平成12年3月　 　同課程修了

平成12年4月　　 東京大学大学院理学系研究科地球惑星科学専攻　博士課程進学

　　　　　　　　日本学術振興会特別研究員(DC1)

平成15年3月　　同課程修了、博士（理学）

平成15年４月　　日本学術振興会特別研究員(PD)

　　　　　　　　静岡大学大学院理工学研究科生物地球環境科学専攻

平成1７年10月　東北大学大学院環境科学研究科　助手

平成19年4月　　東北大学大学院環境科学研究科　助教

平成23年10月　 東北大学大学院環境科学研究科　准教授

令和2年4月　　東北大学大学院環境科学研究科　教授

科研費　　　Google scholar　　　Research Gate　　　Research map

研究業績

原著論文　*別刷り著者

2020

• Okamoto, A.*, Fuse, K., Shimizu, H., Ito, T., 2020. Impact of fluid pressure on failure mode in shear zones: numerical simulation of en-echelon tensile fracturing and transition to shear. Tectonophysics, 774, 228277, doi.org/10.1016/j.tecto.2019.228277.
• Oyanagi, R.*, Okamoto, A., Tsuchiya, N., 2020. Silica controls on hydration kinetics during serpentinization of olivine: Insights from hydrothermal experiments and a reactive transport model. Geochimica et Cosmochimica Acta, 270, 21-42. doi.org/10.1016/j.gca.2019.11.017 
• Watanabe, N.*, Saito, K., Okamoto, A., Nakamura, K., Ishibashi, T., Saishu, H., Komai, T., Tuschiya, N., 2020. Stabilizing and enhancing permeability for sustainable and profitable energy extraction from superhot geothermal environments, Applied Energy, 260, 114306. doi.org/10.1016/j.apenergy.2019.114306 
• Nagaya, T.*, Okamoto, A., Oyanagi, R., Seto, Y., Miyake, A., Uno, M., Muto, J., Wallis., S., accepted. Talc CPO determined by improved EBSD procedure for sheet silicates: Implications for anisotropy at the slab-mantle interface due to Si-metasomatism. American Mineralogist. Doi.org/10.2138/am-2020-7006
• Ueki, K.*, Kuwatani, T., Okamoto, A., Akaho, S., Iwamori, H. 2020. Thermodynamic modeling of hydrous-melt–olivine equilibrium using exhaustive variable selection. Physics of the Earth and Planetary Interiors, doi.org/10.1016/j.pepi.2020.106430
• Characteristics of hydrogen production with carbon storage by CO2-rich hydrothermal alteration of olivine in the presence of Mg-Al spinel. International Journal of Hydrogen Energy, Wang J, Watanabe, N., Okamoto, A., Nakamura, K., Komai, T., accepted.
• A. Suzuki*, M. Miyazawa, A. Okamoto, H. Shimizu, I. Obayashi, Y. Hiraoka, T. Tsuji,P.K. Kang, T. Ito, 2020. Inferring fracture forming processes by characterizing fracture network patterns with persistent homology. Computers and Geosciences, in press.
• Geri, Agroli*, Atsushi Okamoto, Masaoki, Uno, Noriyoshi Tsuchiya, 2020. Transport and Evolution of Supercritical Fluids During the Formation of the Erdenet Cu–Mo Deposit, Mongolia. Geosciences, 10. 201. 10.3390/geosciences10050201

2019

• Wang J. *, Watanabe N., Okamoto, A., Nakamura, K., Komai, T., 2019. Enhanced hydrogen production with carbon storage by olivine alteration in CO₂-rich hydrothermal environments. Journal of CO₂ Utilization, 30, 205-213. doi.org/10.1016/j.jcou.2019.02.008 
• Wang J.*, Watanabe N., Okamoto, A., Nakamura, K., Komai, T., 2019. Acceleration of hydrogen production along water-olivine-CO2 reactions via high-temperature Fe(II) release.  International Journal of Hydrogen Energy, accepted. DOI: 10.1016/j.ijhydene.2019.03.119 
• Harigane Y.*, Okamoto A, Morishita T, Snow JE, Tamura A, Yamashita H, Michibayashi K, Ohara Y, Arai S, 2019. Trace element compositions of amphiboles in gabbro mylonites from the Godzilla Megamullion, Parece Vela Basin, Philippine Sea. Lithos, 344, 217-231.
• Amagai, T., Okamoto, A.*, Niibe, T., Hirano, N., Motomiya, K., Tsuchiya, N., 2019. Silica nanoparticles produced by explosive flash vaporization during earthquakes. Scientific Reports, Accepted.
• Okamoto, K.*, Asanuma, H., Ishibashi, T., Yamaya, Y., Saishua, H., Yanagisawa, N., Mogi, T., Tsuchiya, N., Okamoto, A., Naganawa, S., Ogawa, Y., Ishitsuka, K., Fujimitsu, Y., Kitamura, K., Kajiwara, T., Horimoto, S., Shimadai, K., Geological and engineering features of developing ultra-high-temperature geothermal systems in the world. Geothermics, 82, 267-281.
• Wang J. *, Watanabe N., Okamoto, A., Nakamura, K., Komai, T., 2019. Pyroxene control of H2 production and carbon storage during water-peridotite-CO2 hydrothermal reactions. International Journal of Hydrogen Energy, accepted. 

2018

• Oyanagi, R.*, Okamoto, A., Harigane, Y., Tsuchiya, N., 2018. Al-zoning of serpentine aggregates in mesh texture induced by metasomatic replacement reactions. Journal of Petrology, 59, 613-634. IF 3.380
• Kuwatani, T.*, Nagao, H., Ito, S-I, Okamoto, A., Yoshida, K., Okudaira, T., in press. Recovering the past history of natural recording media by Bayesian inversion. Physical Review E. IF 2.353
• Masuda, T.*, Omori, Y., Sakurai, R., Miyake, T., Yamanouchi, M., Harigane, Y., Okamoto, A., Michibayashi, K., in press. Loop energy: A useful indicator of the hardness of minerals from depth-sensing indentation tests. Journal of Structural Geology, 117, 96-104. IF 3.128
• Oyanagi, R.*, Okamoto, A., Tsuchiya, N., 2018. Multiple kinetic parameterization in a reactive transport model using the exchange Monte Carlo method. Minerals, 8, 579. DOI: 10.3390/min8120579 IF 2.250
• Dandar, O.*, Okamoto, A., Uno, M., Batsaikhan, U., Ulziiburen, B., Tsuchiya, N., 2018. Drone Brings new advance of geological mapping in Mongolia: opportunities and challenges. Mongolian Geoscientist, 47, 53-57. DOI: 10.5564/mgs.v0i47.1063

2017 

• Watanabe N.*, Numakura, T., Sakaguchi, K., Saishu, H., Okamoto, A., Ingebritsen, S., Tsuchiya, N., 2017. Potentially exploitable supercritical geothermal resources in the ductile crust. Nature Geoscience, 10, 140-144. 
• 12. Kameda, J.*, Okamoto, A., Sato, K., Fujimoto, K., Yamaguchi, A., Kimura, G., 2017. Opal-CT in chert beneath the toe of the Tohoku margin and its influence on the seismic aseismic transition in subduction zones. Geophysical Research Letters, 44, 687-693. 
• Uno, M.*, Okamoto, A., Tsuchiya, N., 2017. Excess water generation during reaction-inducing intrusion of granitic melts into ultramafic rocks at crustal P-T conditions in the Sør Rondane Mountains of East Antarctica. Lithos, 284-285, 625-641.
• Okamoto, A.*, Shimizu, H., Fukuda, J., Muto, J., Okudaira, T., 2017. Reaction-induced grain boundary cracking and anisotropic fluid flow during prograde devolatilization reactions within subduction zones. Contributions to Mineralogy and Petrology, 182, 75.
• Saishu, H.*, Okamoto, A., Otsubo, M., 2017. Silica precipitation potentially controls earthquake recurrence in seismogenic zones. Scientific Reports, 7, 13337, DOI:10.1038/s41598-017-13597-5.
• Okamoto, A.*, Tanaka, H., Watanabe, N., Siashu, H., Tsuchiya, N., 2017. Fluid pocket generation in response to heterogeneous reactivity of a rock fracture under hydrothermal conditions. Geophysical Research Letters, 44, 10306-1031510.1002/2017GL075476.

2016年

• 最首花恵*，岡本敦，土屋範芳，2016. 地熱地域の透水－不透水境界と水の状態変化にともなう鉱物析出の関係性．日本地熱学会誌，38巻，1号
• Burenjargal, U.^*, Okamoto, A., Tsuchiya, T., Uno, M., Horie, K., Hokada, T., 2016. Contrasting geochemical signatures of Devonian and Permian granitoids from the Tseel terrane, SW Mongolia. Journal of Geosciences, 61, 51-66.
• Omori Y, Barresi A, Kimura N, Okamoto A, Masuda T*, 2016. Contrast in stress-strain history during exhumation between high- and ultrahigh-pressure metamorphic units in the Western Alps: Microboudinage analysis of piemontite in metacherts. Journal of Structural Geology, 89, 168-180. 
• Hirauchi K-I*, Fukushima K, Kido M, Muto J, Okamoto A. 2016. Reaction-induced rheological weakening enables oceanic plate subduction. Nature Communications, 7, 12550, doi:1038/ncomms12550. 
• Shimizu, H., Okamoto, A.*, 2016. The roles of fluid transport and surface reaction in reaction-induced fracturing, with implications for the development of mesh textures in serpentinites. Contributions to Mineralogy and Petrology, 171, 73. 
• Omori, T.*, Kuwatani T, Okamoto A., Hukushima K., 2016. Bayesian inversion analysis of nonlinear dynamics in surface heterogeneous reactions. Physical Review E, 94, 033305, doi: 10.1103/PhysRevE.94.033305. 
• Wendler, F.*, Okamoto, A., Blum, P., 2016. Phase-filed modeling of epitaxial growth of polycrystalline quartz veins in hydrothermal experiments. Geofluids, 16, 211-230.

2015年

• Okamoto, A.*, Shimizu, H., 2015. Contrasting fracture patterns induced by volume-increasing and -decreasing reactions: implications for the progress of metamorphic reactions. Earth and Planetary Science Letters, 415, 9-18. IF 4.637
• Oyanagi, R., Okamoto, A.*, Hirano, N., Tsuchiya, N., 2015. Competitive hydration and dehydration at olivine-quartz boundary revealed by hydrothermal experiments: implications for silica metasomatism at the crust-mantle boundary. Earth and Planetary Science Letters, 425, 44-54. IF 4.637
• Okamoto, A.*, Kuwatani, T., Omori, T., Hukushima, K., 2015. Free-energy landscape and nucleation pathway of polymorphic minerals from solution in a Potts lattice-gas model. Physical Review E, 92, 042130. IF 2.353
• Ishibashi T.*, Watanabe, N., Hirano, N., Okamoto, A., Tsuchiya, N., 2015. Beyond-laboratory-scale prediction for channeling flows through subsurface rock fractures with heterogeneous aperture distributions revealed by laboratory evaluation. Journal of Geophysical Research, 120, 106-124. IF 3.585

2014年

• 渡邊隆広*・土屋範芳・山崎慎一・山田亮一・平野伸夫・岡本敦・奈良郁子・東北地方津波堆積物研究グループ 2014. 東北地方太平洋沖地震により発生した津波堆積物中のヒ素および重金属の海水用出実験．地学雑誌，123巻, 835-853. 
• 渡邊隆広*・細田憲弘・土屋範芳・中村俊夫・平野伸夫・岡本敦・奈良郁子・東北地方津波堆積物研究グループ 2014. 仙台平野における歴史津波堆積物の放射性炭素年代測定—連続土壌堆積物資料HSシリーズの堆積年代（予察的分析）地学雑誌，123巻, 904-922. 
• Uno, M.*, Okamoto, A., Tsuchiya, N., 2014. Millimeter- to decimeter-scale compositional mapping using a scanning X-ray analytical microscope and its application to a reaction zone in high-grade metamorphic rock. Journal of Mineralogical and Petrological Sciences, 109, 271-278. IF 0.648
• Michibayashi, K.*, Harigane, Y., Ohara, Y., Muto, J., Okamoto, A., 2014. Rheological properties of the detachment shear zone of an oceanic core complex inferred by plagioclase flow law: Godzilla Mega mullion, Parece Vela back-arc basin, Philippine Sea. Earth and Planetary Science Letters, 408, 16-23.
• Burenjargal, U., Okamoto, A.*, Kuwatani, T., Tsuchiya, N., 2014. Thermal evolution of the Tseel terrane, SW Mongolia and its relation to granitoid intrusions in the Central Asian Orogenic Belt. Journal of Metamorphic Geology, 32, 765-790. IF 4.182
• Okamoto, A.*, Musya, M., Hashimoto, Y., Tsuchiya, N., 2014. Distribution of CO₂-fluids in the Shimanto belt on Muroto Peninsula, SW Japan: possible injection of magmatic CO₂ into the accretionary prism. Earth, Planets and Space, 66, 33, doi:10.1186/1880-5981-66-33.
• Ito, T. *, Xu, T., Tanaka, H., Taniuchi, Y., Okamoto, A., 2014. Possibility to remedy CO₂ leakage from geological reservoir using CO₂ reactive Grout. International Journal of Greenhouse Gas Control, 20, 310-323.
• Saishu, H., Okamoto, A.*, Tsuchiya, N., 2014. The significance of silica precipitation on the formation of permeable-impermeable boundary within Earth’s crust. Terra Nova, 26, 253-259.

2013年

• Sekiguchi, C., Hirano, N., Okamoto, A., Tsuchiya, N.*, 2013. Spectroscopic determination of the critical temperatures and pressures of H₂O, CO₂and C₂H₅OH.  Journal of Mineralogical and Petrological Sciences, doi:10.2465/jmps.130620b. IF 0.648
• Ogasawara Y., Okamoto A.*, Hirano N., Tsuchiya N., 2013. Coupled reaction and silica diffusion during serpentinization. Geochimica et Cosmochimica Acta, 119, 212-230. 

2012年

• 岡本敦*, 2012. 海洋リソスフェアにおける蛇紋岩化作用の速度：水熱実験からの制約. 岩石鉱物科学, 41, 185-192.
• Saishu H. *, Okamoto A., Tsuchiya N., 2012. Mineralogical variation of silica induced by Al and Na in hydrothermal solutions. American Mineralogist, 97, 2060-2063. IF 2.631
• Burenjargal U., Okamoto A.*, Meguro Y., Tsuchiya N., 2012. An exhumation pressure–temperature path and fluid activities during metamorphism in the Tseel terrane, SW Mongolia: Constraints from aluminosilicate-bearing quartz veins and garnet zonings in metapelites. Journal of Asian Earth Sciences, 54-55, 214-229. IF 2.762
• Ishibashi T. *, Watanabe N., Hirano N., Okamoto A., and Tsuchiya N., 2012. GeoFlow: A novel model simulator for prediction of the 3-D channeling flow in a rock fracture network. Water Resource Research, 48. doi: 10.1029/2011WR011226 IF 4.36
• Watanabe T. *, Tsuchiya N., Oura Y., Ebihara M., Inoue C., Hirano N., Yamada R., Yamasaki S., Okamoto A., Watanabe Nara F., Nunohara K., 2012. Distribution of artificial radionuclides (110mAg, 129mTe, 134Cs, 137Cs) in surface soils from Miyagi prefecture, northeast Japan, following the 2011 Fukushima Dai-ichi Nuclear Power Plant accident. Geochemical Journal, 46, 279-285. 
• 土屋範芳*，井上千弘， 山田亮一，山崎慎一，平野伸夫， 岡本　敦， 小川泰正， 渡邊隆広，奈良郁子，渡邉則昭，東北地方津波堆積物研究グループ (2012) 東北地方太平洋沖地震による岩手，宮城，福島県沿岸域の津波堆積物のヒ素に関するリスク評価　地質学雑誌, 118,No7,419-430. doi: 10.5575/geosoc.2012.0043. 

2011年

• Okamoto, A.*, Sekine, K., 2011. Textures of syntaxial quartz veins synthesized by hydrothermal experiments. Journal of Structural Geology, 33, 1764-1775. IF 3.128
• Okamoto, A. *, Ogasawara, Y., Tsuchiya, N., 2011. Progress of hydration reactions in olivine–H₂O and orthopyroxenite–H₂O systems at 250 °C and vapor-saturated pressure. Chemical Geology, 289, 245-255.
• Sekine, K.*, Okamoto, A., Hayashi, K., 2011. In situ observation of the crystallization pressure induced by halite crystal growth in a microfluidic channel. American Mineralogist, 96, 1012-1019.
•  Kuwatani, T.*, Okamoto, A., Toriumi, M., 2011. Thermodynamic forward modeling of progressive dehydration reactions during subduction of oceanic crust under greenschist facies conditions. Earth and Planetary Science Letters, 307, 9-18. IF 4.637
• Masuda, T.*, Miyake, T., Kimura, N., & Okamoto, A., 2011. Application of the microboudin method to palaeodifferential stress analysis of deformed impure marbles from Syros, Greece: Implications for grain-size and calcite-twin palaeopiezometers. Journal of Structural Geology, 33, 20-31.

2010年

• Kimura, N. *, Nakayama S., Tsukishima, K., Miwa, S., Okamoto, A. & Masuda, T., 2010. Determination of amphibole fracture strength for quantitative paleostress analysis using microboudinage structures.  Journal of Structural Geology, 32, 136-150. 
• Okamoto, A. *, Saishu, H., Hirano, N. & Tsuchiya, N., 2010. Mineralogical and Textural variation of silica minerals in hydrothermal flow-through experiments: Implications for quartz vein formation. Geochimica et Cosmochimica Acta, 74, 3692-3706. 
• Kameda, J.*, Okamoto, A., Mikouchi, T., Kitagawa, M. and Kogure, T., 2010. The occurrence and structure of vermiform chlorite. Clay Science, 14, 155-161.
• 中島康隆・平野伸夫*・須藤孝一・岡本敦・井上千弘・土屋範芳 (2010) 岩石内に隔離された流体中の有機物および微生物の非汚染検出に関する実験的検討. 地熱学会誌, 32, 41-48. 

2005- 2009年

• Okamoto, A. *, Tsuchiya N., 2009. Velocity of vertical fluid ascent within vein-forming fractures. Geology, 37, 563-566.
• Okamoto, A. *, Kikuchi, T., Tsuchiya, N., 2008. Mineral distribution within polymineralic veins in the Sanbagawa belt, Japan: implications for mass transfer during vein formation. Contributions to Mineralogy and Petrology, 156, 323-336.
• Morohashi, K., Okamoto, A., Satish-Kumar, M., Tsuchiya, N., 2008. Variations in stable isotope compositions (δ13C, δ18O) of calcite within exhumation-related veins from the Sanbagawa metamorphic belt. Journal of Mineralogical and Petrological Sciences, 105, 361-365.
• Okamoto, A.*, Saishu, H., Hirano, N., Watanabe, N., Tsuchiya, N., 2008. Precipitation of silica minerals by hydrothermal flow-through experiments at 200-430 ˚C and 30 MPa. Geothermal Resource Council Transactions, 32, 389-394.
• Masuda, T.*, Nakayama, S., Kimura, N., Okamoto, A., 2008. Magnitude of σ1, σ2, and σ3 at mid-crustal levels in an orogenic belt: Microboudin method applied to an impure metachert from Turkey. Tectonophysics, 460, 320-236.
• Masuda, T. *, Kimura, N., Okamoto, A., Miyake, T., Omori, Y. (2007) Cessation of plastic deformation during exhumation of metamorphic tectonites revealed by microboudinage structures. Journal of Structural Geology, 29, 159-165.
• Michibayashi, K. *, Tasaka M., Ohara Y., Ishii, T., Okamoto, A., Fryer, P., 2007. Variable microstructure of peridotite samples from the southern Mariana Trench: Evidence of a complex tectonic evolution. Tectonophysics, 444, 111-118.
• Okamoto, A. *, Michibayashi, K., 2006. Misorientations of garnet aggregate within a vein: an example of the Sanbagawa metamorphic belt, Japan. Journal of Metamorphic Geology, 24, 353-366.
• Okamoto, A. *, Miyake, T., Masuda, T. (2006) Reaction progress related to indentation structures at glaucophane/glaucophane contacts in an impure marble from Syros, Greece. Journal of Metamorphic Geology, 24, 703-713.
• Michibayashi, K. *, Abe, N., Okamoto, A., Satsukawa, T., Michikura, K., 2006. Seismic anisotropy in the uppermost mantle, back-arc region of the northeast Japan arc: Petrophysical analyses of Ichinomegata peridotite xenoliths. Geophysical Research Letters, 33, ARTN L10312.

2005年以前　東大院生、静大ポスドク時代

• Okamoto, A. *, Toriumi, M., 2005. Progress of actinolite-forming reactions in mafic schists during retrograde metamorphism: An example from the Sanbagawa metamorphic belt in central Shikoku, Japan. Journal of Metamorphic Geology, 23, 335-356.
• Okamoto, A.*, Michibayashi, K., 2005. Progressive shape evolution of a mineral inclusion under differential stress at high temperature: Example of garnet inclusions within a granulite-facies quartzite from the Lützow-Holm Complex, East Antarctica. Journal of Geophysical Research, 110, JB003526.
• Okamoto, A. *, Toriumi, M., 2004. Optimal mixing properties of calcic and subcalcic amphiboles: application of Gibbs’ method to the Sanbagawa schists, SW Japan. Contributions to Mineralogy and Petrology, 146, 529-545.
• Masuda, T. *, Nakayama, T., Kimura, N., Onodera, K., Okamoto, A., 2004. Triaxial stress state deep in orogenic belts: an example from Turkey. Journal of Structural Geology, 26, 2203-2209.
• Michibayashi, K. *, Okamoto, A., Masuzawa, T., Kawakami, T., Ikeda, T., Yasuda, H., 2004. Orientation contrast images of garnet in granulite-facies quartzite, Lützow-Holm Complex, East Antarctica, 地質学雑誌, 口絵 V-VI. 
• Okamoto, A.*, Toriumi, M. (2001) Application of Gibbs’ method to amphibole zonings in metabasaltic system. Contributions to Mineralogy and Petrology, 141, 268-286.
  

総説　（査読あり）２編

• 岡本　敦*，桑谷　立, 2017 変成岩組織と鉱物組成累帯構造からの情報抽出．日本地質学雑誌，123, 733-745. 日本地質学会125周年記念特集号、招待論文
• 岡本　敦*, 2004.　角閃石のギブス法解析. 地学雑誌, 113, 587-599. 

査読のない論文及び総説　３編

• 岡本　敦*　（2014）鉱物脈組織から読み解く地殻流体流動．岩石鉱物科学 43、日本鉱物科学会研究奨励賞第１２回受賞者　研究紹介論文. 査読無
• 岡本　敦*，最首　花恵 (2014)　地熱地帯の脆性−延性遷移領域近傍における岩石−水相互作用．（総特集　陸上化学掘削の将来展望）月刊地球, 36, 63-67. 査読無. 
• 岡本　敦*　(2003) 高圧変成岩上昇期における塩基性片岩の反応と角閃石のマイクロブーディンの関係. 月刊地球, 25, 251-257.