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Possible cometary origin of heavy noble gases in the atmospheres of Venus, Earth and Mars

Abstract

MODELS that trace the origin of noble gases in the atmospheres of the terrestrial planets (Venus, Earth and Mars) to the 'planetary component' in chondritic meteorites confront several problems. The 'missing' xenon in the atmospheres of Mars and Earth (Fig. 1) is one of the most obvious; this gas is not hidden or trapped in surface materials1. On Venus, the absolute abundances of neon and argon per gram of rock are higher even than those in carbonaceous chondrites, whereas the relative abundances of argon and krypton are closer to solar than to chondritic values (there is only an upper limit on xenon)2 (Fig. 1). Pepin3 has developed a model that emphasizes hydrodynamic escape of early, massive hydrogen atmospheres to explain the abundances and isotope ratios of noble gases on all three planets. We have previously suggested that the unusual abundances of heavy noble gases on Venus might be explained by the impact of a low-temperature comet4–6. Further consideration of the probable history of the martian atmosphere7, the noble-gas data from the (Mars-derived) SNC meteorites8–10 and laboratory experiments on the trapping of noble gases in ice6,11,12 lead us to propose here that the noble gases in the atmospheres of all of the terrestrial planets are dominated by a mixture of an internal component and a contribution from impacting icy planetesimals (comets). If true, this hypothesis illustrates the importance of impacts in determining the volatile inventories of these planets.

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Owen, T., Bar-Nun, A. & Kleinfeld, I. Possible cometary origin of heavy noble gases in the atmospheres of Venus, Earth and Mars. Nature 358, 43–46 (1992). https://doi.org/10.1038/358043a0

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