H2 generation by experimental hydrothermal alteration of komatiitic glass at 300°C and 500 bars: A preliminary result from on-going experiment

DOI Web Site 被引用文献21件 参考文献31件 オープンアクセス
  • YOSHIZAKI MOTOKO
    Department of Earth and Planetary Sciences, Tokyo Institute of Technology Precambrian Ecosystem Laboratory, Japan Agency for Marine-Earth Science and Technology (JAMSTEC)
  • SHIBUYA TAKAZO
    Precambrian Ecosystem Laboratory, Japan Agency for Marine-Earth Science and Technology (JAMSTEC)
  • SUZUKI KATSUHIKO
    Precambrian Ecosystem Laboratory, Japan Agency for Marine-Earth Science and Technology (JAMSTEC) Institute for Research on Earth Evolution (IFREE), Japan Agency for Marine-Earth Science and Technology (JAMSTEC)
  • SHIMIZU KENJI
    Precambrian Ecosystem Laboratory, Japan Agency for Marine-Earth Science and Technology (JAMSTEC) Institute for Research on Earth Evolution (IFREE), Japan Agency for Marine-Earth Science and Technology (JAMSTEC)
  • NAKAMURA KENTARO
    Precambrian Ecosystem Laboratory, Japan Agency for Marine-Earth Science and Technology (JAMSTEC)
  • TAKAI KEN
    Precambrian Ecosystem Laboratory, Japan Agency for Marine-Earth Science and Technology (JAMSTEC) Subsurface Geobiology Advanced Research (SUGAR) project, Japan Agency for Marine-Earth Science and Technology (JAMSTEC)
  • OMORI SOICHI
    Department of Earth and Planetary Sciences, Tokyo Institute of Technology
  • MARUYAMA SHIGENORI
    Department of Earth and Planetary Sciences, Tokyo Institute of Technology

書誌事項

公開日
2009
DOI
  • 10.2343/geochemj.1.0058
公開者
一般社団法人日本地球化学会

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説明

Hydration of komatiite can be a source of significant amount of hydrogen in the Hadean and early Archean ocean floor. We report the first direct evidence for this process based on the results of our hydrothermal alteration experiments on the synthetic komatiitic glass at 300°C and 500 bars. Komatiitic glass was synthesized by dehydration and remelting of serpentinized Al-depleted komatiite collected from the early Archean Komati Formation, the Barberton Greenstone Belt, South Africa. Though the run is still continuing in our lab, the observed accumulation of hydrogen (2.4 mmol/kg) over 2,600 hours is truly significant and is comparable to those observed by hydration of peridotitic rocks. Our results suggest that hydrothermal alteration of komatiites may have provided the source of H2 in the vicinity of hydrothermal vents that fueled the early evolution of living ecosystems in the Hadean and early Archean.

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