Experimental reconstruction of Archean alkaline hydrothermal fluid

2011 Fiscal Year Final Research Report

• Project/Area Number: 22740333
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Single-year Grants
• Research Field: Geology
• Research Institution: Japan Agency for Marine-Earth Science and Technology
• Principal Investigator: SHIBUYA Takazo 独立行政法人海洋研究開発機構, システム地球ラボ, 研究員 (00512906)
• Project Period (FY): 2010 – 2011
• Keywords: 太古代 / 熱水 / pH / アルカリ性 / 実験

Research Abstract

High-temperature and-pressure experiments simulating reactions between basalt and seawater under CO2-rich conditions were conducted to reconstruct compositions of high-temperature fluids in the Archean subseafloor hydrothermal system. As a result, it was revealed that the high-temperature reactions between basalt and CO2-rich seawater generate silica-rich and metal-poor hydrothermal fluids with elevated pHin-situ(> 7). This suggests that Archean deep-sea high-temperature hydrothermal vent was not modern-type acidic black smoker but silica-dominant clear smoker.

Research Products

• [Journal Article] Discovery of New Hydrothermal Activity and Chemosynthetic Fauna on the Central Indian Ridge at 18°-20°S. (2012)
  • Author(s): Nakamura, K., Watanabe, H., Miyazaki, J., Takai, K., Kawagucci, S., Noguchi, T., Nemoto, S., Watsuji, T.-o., Matsuzaki, T., Shibuya, T., Okamura, K., Mochizuki, M., Orihashi, Y., Ura, T., Asada, A., Marie, D., Koonjul, M., Singh, M., Beedessee, G., Bhikajee, M. and Tamaki, K.
  • Journal Title: PloS One Volume: 7(3) Pages: e32965
  • DOI: doi:10.1371/journal.pone.0032965.
  • Peer Reviewed
• [Journal Article] Depth variation of carbon and oxygen isotopes of calcites in Archean altered upper oceanic crust : Implications for the CO2 flux from ocean to oceanic crust in the Archean (2012)
  • Author(s): Shibuya, T., Tahata, M., Kitajima, K., Ueno, Y., Komiya, T., Yamamoto, S., Igisu, M., Terabayashi, M., Sawaki, Y., Takai, K., Yoshida, N. and Maruyama, S.
  • Journal Title: Earth and Planetary Science Letters Volume: 321-322 Pages: 64-73
  • DOI: doi:10.1016/j.epsl.2011.12.034.
  • Peer Reviewed
• [Journal Article] Monazite geochronology and geochemistry of meta-sediments in the Narryer Gneiss Complex (2012)
  • Author(s): Iizuka, T., McCulloch, M. T., Komiya, T., Shibuya, T., Ohta, K., Ozawa, H., Sugimura, E. and Collerson, K. D.
  • Journal Title: Contributions to Mineralogy and Petrology Volume: 160 Pages: 803-823
  • DOI: doi:10.1007/s00410-010-0508-0.
  • Peer Reviewed
• [Journal Article] 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 Geochimica et Cosmochimica Acta (2010)
  • Author(s): Nishizawa, M., Yamamoto, H., Ueno, Y., Tsuruoka, S., Shibuya, T., Sawaki, Y., Yamamoto, S., Kon, Y., Kitajima, K., Komiya, T., Maruyama, S. and Hirata, T.
  • Volume: 74
  • Pages: 2760-2778
  • DOI: doi:10.1016/j.gca.2010.02.014
  • Peer Reviewed
• [Journal Article] 87Sr/86Sr chemostratigraphy of Neoproterozoic Dalradian carbonatesbelow the Port Askaig Glaciogenic Formation (2010)
  • Author(s): Sawaki, Y., Kawai, T., Shibuya, T., Tahata, M., Omori, S., Komiya, T., Yoshida, N., Hirata, T., Ohno, T., Windley, B. F. and Maruyama, S.
  • Journal Title: Scotland. Precambrian Research Volume: 179 Pages: 150-164
  • DOI: doi:10.1016/j.precamres.2010.02.021.
  • Peer Reviewed
• [Journal Article] Imbricated ocean-plate stratigraphy and U-Pb zircon ages from tuff beds in cherts in the Ballantrae Complex (2010)
  • Author(s): Sawaki, Y., Shibuya, T., Kawai, T., Komiya, T., Omori, S., Iizuka, T., Hirata, T., Windley, B. F. and Maruyama, S.
  • Journal Title: SW Scotland. Geological Society of America Bulletin Volume: 122 Pages: 454-464
  • DOI: doi:10.1130/B26329.1.
  • Peer Reviewed
• [Journal Article] Stratigraphy-related, low-pressure metamorphism in the Hardey Syncline, Hamersley Province (2010)
  • Author(s): Shibuya, T., Aoki, K., Komiya, T. and Maruyama, S.
  • Journal Title: Western Australia. Gondwana Research Volume: 18 Pages: 213-221
  • DOI: doi:10.1016/j.gr.2010.01.002
  • Peer Reviewed
• [Journal Article] Highly alkaline, high-temperature hydrothermal fluids in the early Archean ocean. (2010)
  • Author(s): Shibuya, T., Komiya, T., Nakamura, K., Takai, K. and Maruyama, S.
  • Journal Title: Precambrian Research Volume: 182(3) Pages: 230-238
  • DOI: doi:10.1016/j.precamres.2010.08.011.
  • Peer Reviewed
• [Presentation] 初期地球の大気海洋CO2濃度変動 (2011)
  • Author(s): 渋谷岳造、小宮剛、高井研、丸山茂徳
  • Organizer: 2011年度日本地球化学会年会
  • Place of Presentation: 北海道大学札幌キャンパス
  • Year and Date: 2011-09-14
• [Presentation] 地球史を通じた大気海洋CO2濃度変化 (2011)
  • Author(s): 渋谷岳造、小宮剛、高井研、丸山茂徳
  • Organizer: 日本地質学会第118年学術大会
  • Place of Presentation: 茨城大学水戸キャンパス
  • Year and Date: 2011-09-11
• [Presentation] Alkaline hydrothermal fluids in the early Archean ocean. (2010)
  • Author(s): Shibuya, T., Komiya, T., Nakamura, K., Takai, K. and Maruyama, S.
  • Organizer: 5th International Archean Symposium
  • Place of Presentation: Perth, Australia
  • Year and Date: 2010-09-08
• [Presentation] Highly alkaline high-temperature hydrothermal fluid generated by Archean CO2-rich seawater. (2010)
  • Author(s): Shibuya, T., Komiya, T., Nakamura, K., Takai, K. and Maruyama, S.
  • Organizer: Goldschmidt Conference 2010
  • Place of Presentation: Knoxville, USA
  • Year and Date: 2010-06-17
• [Presentation] 熱水性石英中の流体包有物から読み取る初期地球の海水中CO2濃度 (2010)
  • Author(s): 渋谷岳造、上野雄一郎、小宮剛、吉田尚弘、丸山茂徳、高井研
  • Organizer: 日本地球惑星科学連合2010年大会
  • Place of Presentation: 幕張メッセ国際会議場
  • Year and Date: 2010-05-25
• [Remarks] (1)しんぶん赤旗2010/6/28『地球の酸素いつから豪州の砂漠岩石の研究から新説』
• [Remarks] (2) NHK出版「深海で生命の起源を探る」写真提供
• [Remarks] (3) BSプレミアムコズミックフロント「地球外生命を探せ～ついに発見!?生命の星～」撮影協力
• [Remarks] (4)産経新聞2010/3/6「地球生命の起源に迫る」