Abstract

A simple analytic model of mass fractionation in hydrodynamic escape is applied to the problem of the origin and evolution of terrestrial planet atmospheres and meteoritic noble gases from primordial compositions. It is shown that isotopic distributions of xenon, krypton, argon, and neon on Earth can be generated by two stages of hydrodynamic loss, first of a hydrogen-rich, isotopically solar primitive atmosphere, and then of Kr, Ar, and Ne subsequently outgassed from deep within the planet. Degassed species are also isotopically solar, and their required elemental fractionation pattern is in reasonable agreement with laboratory adsorption experiments

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