The origin of seeping gas from the coastal area of Yagaji Island in Northern Okinawa Island

DOI IR HANDLE Web Site 77 References Open Access
  • TOKI Tomohiro
    Department of Chemistry, Biology and Marine Science, Faculty of Science, University of the Ryukyus
  • HONDA Ryutaro
    Department of Chemistry, Biology and Marine Science, Faculty of Science, University of the Ryukyus
  • OOMINE Kazuki
    Department of Chemistry, Biology and Marine Science, Faculty of Science, University of the Ryukyus
  • TSUNOGAI Urumu
    Earth and Planetary System Science, Faculty of Science, Hokkaido University Graduate School of Environmental Studies, Nagoya University
  • KOMATSU Daisuke D.
    Earth and Planetary System Science, Faculty of Science, Hokkaido University Graduate School of Environmental Studies, Nagoya University
  • SANO Yuji
    Marine Analytical Chemistry, Department of Chemical Oceanography, Atmosphere and Ocean Research Institute, The University of Tokyo
  • TAKAHATA Naoto
    Marine Analytical Chemistry, Department of Chemical Oceanography, Atmosphere and Ocean Research Institute, The University of Tokyo
  • KINOSHITA Masataka
    Kochi Institute for Core Sample Research, Japan Agency for Marine-Earth Science and Technology
  • YAMASHIRO Hideyuki
    Department of Bioresources and Engineering, Okinawa National College of Technology

Bibliographic Information

Other Title
  • 沖縄本島北部屋我地島沿岸における湧出ガスの起源
  • オキナワ ホントウ キタベヤ ガチトウ エンガン ニ オケル ユウシュツ ガス ノ キゲン

Search this article

Abstract

Chemical and isotopic compositions of seeping gas from the coastal area of Yagaji Island were measured. The gases composed mainly of methane. The δ13C and δD of methane suggest that the origin of the methane is thermal decomposition of organic matter. The δ13C of methane and CH4/(C2H6+C3H8) ratio in the gases suggest long distance migration from the sources. The 3He/4He ratios in the Yagaji gases suggest thermal decomposition of organic matter occurs in deeply-buried sediments. The Yagaji gases would be generated from marine organic matter in the Motobu group around 4 km below the ground.

Journal

  • Chikyukagaku

    Chikyukagaku 46 (4), 257-274, 2012

    The Geochemical Society of Japan

References(77)*help

See more

Keywords

Details 詳細情報について

Report a problem

Back to top