Mars' atmospheric neon suggests volatile-rich primitive mantle
arXiv:2108.11537 · doi:10.1016/j.icarus.2021.114685
Abstract
Martian atmospheric neon (Ne) has been detected by Viking and also found as trapped gas in Martian meteorites, though its abundance and isotopic composition have not been well determined. Because the timescale of Ne loss via atmospheric escape estimated from recent measurements with MAVEN is short (0.6--1 10 years), the abundance and isotope composition of Martian atmospheric Ne reflect recent atmospheric gas supply mostly from volcanic degassing. Thus, it can serve as a probe for the volatile content of the interior. Here we show that the tentatively-informed atmospheric Ne abundance suggests recent active volcanism and the mantle being richer in Ne than Earth's mantle today by more than a factor of 5--80. The estimated mantle Ne abundance requires efficient solar nebular gas capture or accretion of Ne-rich materials such as solar-wind-implanted dust in the planet formation stage, both of which provide important constraints on the abundance of other volatile elements in the interior and the accretion history of Mars. More precise determination of atmospheric Ne abundance and isotopic composition by in situ analysis or Mars sample return is crucial for distinguishing the possible origins of Ne.
57 pages, 4 figures, accepted for publication in Icarus
References in corpus (19)
- The origins and concentrations of water, carbon, nitrogen and noble gases on Earth
- Most 1.6 Earth-Radius Planets are not Rocky
- Warming early Mars with CO2 and H2
- The Extreme Ultraviolet and X-Ray Sun in Time: High-Energy Evolutionary Tracks of a Solar-Like Star
- Constraints on the mass of a habitable planet with water of nebular origin
- Hydrodynamics of Embedded Planets' First Atmospheres. II. A Rapid Recycling of Atmospheric Gas
- Evidence for multiple magma ocean outgassing and atmospheric loss episodes from mantle noble gases
- Evolution of Water Reservoirs on Mars: Constraints from Hydrogen Isotopes in Martian Meteorites
- The efficiency of dust trapping in ringed proto-planetary discs
- A warmer and wetter solution for early Mars and the challenges with transient warming
- Nonsticky Ice at the Origin of the Uniformly Polarized Submillimeter Emission from the HL Tau Disk
- A Lower Limit of Atmospheric Pressure on Early Mars Inferred from Nitrogen and Argon Isotopic Compositions
- Loss and fractionation of noble gas isotopes and moderately volatile elements from planetary embryos and early Venus, Earth and Mars
- Radial variations in grain sizes and dust scale heights in the protoplanetary disk around HD 163296 revealed by ALMA polarization observation
- On the filtering and processing of dust by planetesimals 1. Derivation of collision probabilities for non-drifting planetesimals
- Anoxic Atmospheres on Mars Driven by Volcanism: Implications for Past Environments and Life
- Gas flow around a planet embedded in a protoplanetary disc: the dependence on the planetary mass
- Influences of three-dimensional gas flow induced by protoplanets on pebble accretion --. shear regime
- The Dynamic Proto-atmospheres around Low-Mass Planets with Eccentric Orbits