Carbon isotope systematics of CO2, CO and CH4 in fumarolic gases from Satsuma-Iwojima volcanic island, Japan

• Sato Masanori

  Laboratory for Earthquake Chemistry, Graduate School of Science, University of Tokyo

• Mori Toshiya

  Laboratory for Earthquake Chemistry, Graduate School of Science, University of Tokyo

• Shimoike Yoichi

  Laboratory for Earthquake Chemistry, Graduate School of Science, University of Tokyo

• Nagao Keisuke

  Laboratory for Earthquake Chemistry, Graduate School of Science, University of Tokyo

• Notsu Kenji

  Laboratory for Earthquake Chemistry, Graduate School of Science, University of Tokyo

書誌事項

タイトル別名

• Carbon isotope systematics of CO<SUB>2</SUB>, CO and CH<SUB>4</SUB> in fumarolic gases from Satsuma-Iwojima volcanic island, Japan

抄録

Carbon isotopic composition (δ¹³C) of CO₂, CO and CH₄ were determined for fumarolic gases from Satsuma-Iwojima, to range from -3.1 to -2.6‰, from -11.6 to -2.8‰ and from -56 to -37‰, respectively. Carbon isotope exchange equilibrium temperature between CO₂ and CO was calculated to be ranging from 896° to 950°C for high temperature (691° to 882°C) fumarolic gases, suggesting that CO₂ and CO were in isotopic equilibrium near the vent temperature. However, low temperature (<650°C) gases were not in isotopic equilibrium between CO₂ and CO under any realistic conditions. The correlations of δ¹³C(CO), CO/CO₂ ratio and temperature can be explained in terms of kinetic conversion of CO to CO₂ with decreasing temperature. The δ¹³C values of CH₄ and CO₂ revealed that the CH₄ was not equilibrated in carbon isotope exchange reaction with CO₂ even at fumarolic gas temperature near 900°C. Correlation of δ¹³C(CH₄) and CH₄/C₂H₆ ratio indicate that CH₄ of the low CH₄/CO₂ ratio group (<10^-5) is mainly originated from thermogenic decomposition of organic matter, while the high CH₄/CO₂ ratio group gas (7.7 × 10^-4 to 7.4 × 10^-3) is contaminated by the CH₄-rich gas with δ¹³C value of about -40‰.

収録刊行物

• Ｅａｒｔｈ，　Ｐｌａｎｅｔｓ　ａｎｄ　Ｓｐａｃｅ

  Ｅａｒｔｈ，　Ｐｌａｎｅｔｓ　ａｎｄ　Ｓｐａｃｅ 54 (3), 257-263, 2002

  地球電磁気・地球惑星圏学会 、公益社団法人 日本地震学会、特定非営利活動法人 日本火山学会、日本測地学会、日本惑星科学会

キーワード

• Space and Planetary Science
• Geology

詳細情報

• CRID: 1390282681489687552
• NII論文ID: 10008634724
• NII論文ID: 130003956301
• NII書誌ID: AA11211921
• DOI: 10.1186/bf03353025
• COI: 1:CAS:528:DC%2BD38XjtVKjtbo%3D
• ISSN: 18805981
• ISSN: 13438832
• ISSN: http://id.crossref.org/issn/13438832
• NDL書誌ID: 6262985
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I6262985
• Web Site: https://link.springer.com/content/pdf/10.1186/BF03353025.pdf
• Web Site: https://link.springer.com/article/10.1186/BF03353025/fulltext.html
• Web Site: http://link.springer.com/content/pdf/10.1186/BF03353025
• 本文言語コード: en
• データソース種別:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
• 抄録ライセンスフラグ: 使用不可