【太古代の地球表層環境の解読】

　27-40億年前の地球表層環境を岩石から探るため、オーストラリア・ピルバラ地域、南アフリカ・バーバートン緑色岩帯、カナダ・ラブラドル地域に産出する太古代地質体の調査に参加させていただきました。ラブラドル地域の岩体を詳細に調べたところ、地球最古の表成岩(地球表層で形成された岩石)を見つける事ができました(上記赤字: Shimojo et al., 2016)。

　詳細につきましては東大小宮研のHPで紹介されているので、そちらをご覧ください。

【初期地球研究に関する業績】

論文題名：Constraints on the P–T conditions of high-pressure metamorphic rocks from the Inyoni shear zone in the mid-Archean Barberton Greenstone Belt, South Africa

著者名：Kato, D., Aoki, K., Komiya, T., Yamamoto, S., Sawaki, Y., Asanuma, H., Sato, T., Tsuchiya, Y., Shozugawa, T., Matsuo, M., Windley. B. F. 

雑誌名・巻・頁・発行年：Precambrian Research, 315, 1-18, 2018.

 

論文題名：U-Pb zircon geochronology of the North Pole Dome adamellite in the eastern Pilbara Craton

著者名：Asanuma, H., Sawaki, Y., Sakata, S., Obayashi, H., Suzuki, K., Kitajima, K., Hirata, T., Maruyama, S.

雑誌名・巻・頁・発行年：Island Arc, 27, e12248, 2018.

 

論文題名：A prolonged granitoid formation in Saglek Block, Labrador: Zonal growth and crustal reworking of continental crust in the Eoarchean

著者名：Komiya, T., Yamamoto, S., Aoki, S., Koshida, K., Shimojo, M., Sawaki, Y., Aoki, K., Sakata, S., Yokoyama, T. D., Maki, K., Ishikawa, A., Hirata, T., Collerson, K. D.

雑誌名・巻・頁・発行年：Geoscience Frontiers, 8(2), 355-385, 2017.

 

論文題名：Reactions between olivine and CO2-rich seawater at 300 °C: Implications for H2 generation and CO2 sequestration on the early Earth

著者名：Ueda, H., Sawaki, Y., Maruyama, S.

雑誌名・巻・頁・発行年：Geoscience Frontiers, 8(2), 387-396, 2017.

 

論文題名：Occurrence and geochronology of the Eoarchean, ~3.9 Ga, Iqaluk Gneiss in the Saglek Block, northern Labrador, Canada: Evidence for the oldest supracrustal rocks in the world

著者名：Shimojo, M., Yamamoto, S., Sakata, S., Maki, K., Sawaki, Y., Ishikawa, A., Aoki, K., Okada, Y., Aoki, S., Koshida, K., Hirata, T., Collerson, K. D., Komiya, T.

雑誌名・巻・頁・発行年：Precambrian Research, 278, 218-243, 2016.

 

論文題名：Reactions between komatiite and CO2-rich seawater at 250 °C and 350 °C, 500 bars: Implications for hydrogen generation in the Hadean seafloor hydrothermal system

著者名：Ueda, H., Shibuya, T., Sawaki, Y., Saitoh, M., Takai, K., Maruyama, S.

雑誌名・巻・頁・発行年：Progress on Earth and Planetary Sciences, 3, 1-14, 2016.

 

論文題名：Rock magnetism of tiny exsolved magnetite in plagioclase from a Paleoarchean granitoid in the Pilbara craton

著者名：Usui, Y., Shibuya, T., Sawaki, Y., Komiya, T.

雑誌名・巻・頁・発行年：G-Cubed (Geochemistry, Geophisics, Geosystems), 16, 112-125, 2015

 

論文題名：In-situ iron isotope analysis of pyrites in ~3.7 Ga sedimentary protoliths from the Isua supracrustal belt, southern West Greenland

著者名：Yoshiya, K., Sawaki, Y., Hirata, T., Maruyama, S., Komiya, T.

雑誌名・巻・頁・発行年：Chemical Geology, 401, 126-139, 2015

 

論文題名：In-situ iron isotope analyses of pyrites from 3.5 to 3.2 Ga sedimentary rocks of the Barberton Greenstone Belt, Kaapvaal Craton

著者名：Yoshiya, K., Sawaki, Y., Shibuya, T., Yamamoto, S., Komiya, T., Hirata, T., Maruyama, S.

雑誌名・巻・頁・発行年：Chemical Geology, 403, 58-73, 2015

 

論文題名：Geology of the Eoarchean, >3.95 Ga, Nulliak supracrustal rocks in the Saglek Block, northern Labrador, Canada: The oldest geological evidence for plate tectonics

著者名：Komiya, T., Yamamoto, S., Aoki, S., Sawaki, Y., Ishikawa, A., Tashiro, T., Koshida, K., Shimojo, M., Aoki, K., Collerson, K.

雑誌名・巻・頁・発行年：Tectonophysics, 662, 40-66, 2015

 

論文題名：Depth variation of carbon and oxygen isotopes of calcites in Archean altered upper oceanic crust in the Archean

著者名：Shibuya, T., Tahata, M., Kitajima, K., Ueno, Y., Komiya, T., Yamamoto, S., Igisu, M., Terabayashi, M., Sawaki, Y., Takai, K., Yoshida, N., Maruyama, S.

雑誌名・巻・頁・発行年：Earth and Planetary Science Letters, 321-322, 64-73, 2012

 

論文題名：In situ iron isotope analyses of pyrite and organic carbon isotope ratios in the Fortescue Group: Metabolic variations of a Late Archean ecosystem

著者名：Yoshiya, K., Nishizawa, M., Sawaki, Y., Ueno, Y., Komiya, T., Yamada, K., Yoshida, N., Hirata, T., Wada, H., Maruyama, S.

雑誌名・巻・頁・発行年：Precambrian Research, 212-213, 169-193, 2012

 

論文題目：Grain-scale iron isotopic distribution of pyrite from Precambrian shallow marine carbonate revealed by a femtosecond laser ablation multicollector ICP-MS technique: Possible proxy for the redox state of ancient seawater

著者名：Nishizawa, M., Yamamoto, H., Ueno, Y., Tsuruoka, S., Shibuya, T., Sawaki, Y., Yamamoto, S., Kon, Y., Kitajima, K., Komiya, T., Maruyama, S., Hirata, T.

雑誌名・巻・頁・発行年：Geochimica et Cosmochimica Acta, 74, 2760-2778, 2010