Abstract
THE isotopic compositions and relative abundances of rare gases in the Earth's atmosphere impose rigid constraints on models of atmospheric evolution. Appreciable quantities of argon from the Devonian atmosphere have been extracted from silicified fossil plants and the isotopic composition of this argon implies that the Earth must have been strongly outgassed early in its history.
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CADOGAN, P. Palaeoatmospheric argon in Rhynie chert. Nature 268, 38–41 (1977). https://doi.org/10.1038/268038a0
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DOI: https://doi.org/10.1038/268038a0
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