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

  title={Possible cometary origin of heavy noble gases in the atmospheres of Venus, Earth and Mars},
  author={T. Owen and A. Bar-Nun and I. Kleinfeld},
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… Expand
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The difference between the measured atmospheric abundances of neon, argon, krypton, and xenon for Venus, Earth, and Mars is striking. Because these abundances drop by at least 2 orders of magnitudeExpand
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Contributions of Icy Planetesimals to the Earth's Early Atmosphere
  • T. Owen, A. Bar-Nun
  • Environmental Science, Medicine
  • Origins of life and evolution of the biosphere
  • 2004
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Mars cryosphere: A potential reservoir for heavy noble gases?
Abstract The two orders of magnitude drop between the measured atmospheric abundances of non-radiogenic argon, krypton and xenon in Earth versus Mars is striking. Here, in order to account for thisExpand
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An examination is conducted concerning the circumstances under which the difference between earth and Venus (and Mars) fits naturally into theories in which the terrestrial planets formed by theExpand