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Planetesimal accretion phases

The compositional characteristics of an icy planetesimal source in comet accretion models for Venus, discussed below, require occlusion of nebular noble gases with approximately unfractionated elemental ratios for Ar Kr Xe but much lower Ne. Thermodynamic modeling suggests that noble gases incorporated in clathrates do indeed have low Ne/Ar ratios, but do not reflect ambient gas-phase compositions for Xe/Ar and Kr/Ar and instead are strongly enriched in the heavier species (Lunine and Stevenson... [Pg.213]

See other pages where Planetesimal accretion phases is mentioned: [Pg.309]    [Pg.509]    [Pg.453]    [Pg.44]    [Pg.187]    [Pg.19]    [Pg.20]    [Pg.395]    [Pg.431]    [Pg.514]    [Pg.610]    [Pg.54]    [Pg.213]    [Pg.175]    [Pg.188]    [Pg.190]    [Pg.597]    [Pg.90]    [Pg.4]    [Pg.237]    [Pg.457]    [Pg.124]   
See also in sourсe #XX -- [ Pg.19 ]



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