論文

査読有り 筆頭著者 責任著者
2022年10月2日

Low 13C-13C abundances in abiotic ethane

Nature Communications
  • Koudai Taguchi
  • ,
  • Alexis Gilbert
  • ,
  • Barbara Sherwood Lollar
  • ,
  • Thomas Giunta
  • ,
  • Christopher J. Boreham
  • ,
  • Qi Liu
  • ,
  • Juske Horita
  • ,
  • Yuichiro Ueno

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記述言語
掲載種別
研究論文(学術雑誌)
DOI
10.1038/s41467-022-33538-9
出版者・発行元
Springer Science and Business Media LLC

Abstract

Distinguishing biotic compounds from abiotic ones is important in resource geology, biogeochemistry, and the search for life in the universe. Stable isotopes have traditionally been used to discriminate the origins of organic materials, with particular focus on hydrocarbons. However, despite extensive efforts, unequivocal distinction of abiotic hydrocarbons remains challenging. Recent development of clumped-isotope analysis provides more robust information because it is independent of the stable isotopic composition of the starting material. Here, we report data from a 13C-13C clumped-isotope analysis of ethane and demonstrate that the abiotically-synthesized ethane shows distinctively low 13C-13C abundances compared to thermogenic ethane. A collision frequency model predicts the observed low 13C-13C abundances (anti-clumping) in ethane produced from methyl radical recombination. In contrast, thermogenic ethane presumably exhibits near stochastic 13C-13C distribution inherited from the biological precursor, which undergoes C-C bond cleavage/recombination during metabolism. Further, we find an exceptionally high 13C-13C signature in ethane remaining after microbial oxidation. In summary, the approach distinguishes between thermogenic, microbially altered, and abiotic hydrocarbons. The 13C-13C signature can provide an important step forward for discrimination of the origin of organic molecules on Earth and in extra-terrestrial environments.

リンク情報
DOI
https://doi.org/10.1038/s41467-022-33538-9
URL
https://www.nature.com/articles/s41467-022-33538-9.pdf
URL
https://www.nature.com/articles/s41467-022-33538-9
ID情報
  • DOI : 10.1038/s41467-022-33538-9
  • eISSN : 2041-1723

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