Physics
Scientific paper
Apr 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990icar...84..503z&link_type=abstract
Icarus (ISSN 0019-1035), vol. 84, April 1990, p. 503-527. Research supported by National Research Council and Stanford Universit
Physics
11
Fractionation, Hydrodynamics, Hydrogen, Mars Atmosphere, Abundance, Argon, Carbon Dioxide, Distillation, Escape Velocity, Neon
Scientific paper
The theory of mass fractionation by hydrogen is presently extended to atmospheres in which hydrogen is not the major constituent. This theoretical framework is applied to three different cases. In the first, it is shown that the fractionation of terrestrial atmospheric neon with respect to mantle neon is explainable as a consequence of diffusion-limited hydrogen escape from a steam atmosphere toward the end of the accretion process. In the second, the anomalously high Ar-38/Ar-36 ratio of Mars is shown to be due to hydrodynamic fractionation by a vigorously escaping and very pure hydrogen wind. In the last case, it is speculated that the currently high Martian D/H ratio emerged during the hydrodynamic escape phase which fractionated Ar.
Kasting James F.
Pollack James B.
Zahnle Kevin
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