Estimating the capacity for production of formamide by radioactive minerals on the prebiotic Earth

Zachary R. Adam, Yayoi Hongo, H. James Cleaves, Ruiqin Yi, Albert C. Fahrenbach, Isao Yoda, Masashi Aono

研究成果: Article査読

25 被引用数 (Scopus)

抄録

Water creates special problems for prebiotic chemistry, as it is thermodynamically favorable for amide and phosphodiester bonds to hydrolyze. The availability of alternative solvents with more favorable properties for the formation of prebiotic molecules on the early Earth may have helped bypass this so-called "water paradox". Formamide (FA) is one such solvent, and can serve as a nucleobase precursor, but it is difficult to envision how FA could have been generated in large quantities or accumulated in terrestrial surface environments. We report here the conversion of aqueous acetonitrile (ACN) via hydrogen cyanide (HCN) as an intermediate into FA by γ-irradiation under conditions mimicking exposure to radioactive minerals. We estimate that a radioactive placer deposit could produce 0.1-0.8 mol FA km-2 year-1. A uraninite fission zone comparable to the Oklo reactors in Gabon can produce 0.1-1 mol m-2 year-1, orders of magnitude greater than other scenarios of FA production or delivery for which reaching sizeable concentrations of FA are problematic. Radioactive mineral deposits may be favorable settings for prebiotic compound formation through emergent geologic processes and FA-mediated organic chemistry.

本文言語English
論文番号265
ジャーナルScientific reports
8
1
DOI
出版ステータスPublished - 2018 12月 1

ASJC Scopus subject areas

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