The Possibility of Catastrophic Magma Ocean Degassing and Implications for the Formation of Early Planetary Atmospheres

Details The Possibility of Catastrophic Magma Ocean Degassing and Implications for the Formation of Early Planetary Atmospheres The Possibility of Catastrophic Magma Ocean Degassing and Implications for the Formation of Early Planetary Atmospheres

Oct 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010dps....42.5205e&link_type=abstract

American Astronomical Society, DPS meeting #42, #52.05; Bulletin of the American Astronomical Society, Vol. 42, p.1071

Astronomy and Astrophysics

Astrophysics

Scientific paper

Partial or whole-planet magma oceans produced by oligarchic accretionary impacts provide a starting point for modeling planetary evolution. A key component in these models is the formation of an early atmosphere, which is related to understanding when volatiles begin to exsolve from the magma ocean and in what quantities. The idea behind this paper is to use our knowledge of the physical processes that determine bubble dynamics at the microscopic scale in order to derive constraints on degassing processes in magma oceans at the macroscopic scale. We find that for typical meteoritic volatile contents, degassing is likely to occur discontinuously with an initial period of negligible degassing and a catastrophic degassing event later during the solidi cation process. The two key parameters controlling the degassing of magma oceans is their initial volatile content and the overall depth of the magma ocean. The insight that the magma ocean depth, or equivalently, the extent of melting during the final stages of planetary accretion plays an important role for degassing might provide a new framework for understanding when and why some of today's di fferences between the various terrestrial planets might have originated.

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