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Meteorite constraints on Martian atmospheric loss and paleoclimate

Journal Article · · Earth and Planetary Science Letters
 [1]
  1. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States). Nuclear and Chemical Sciences Division
The evolution of Mars' atmosphere to its currently thin state incapable of supporting liquid water remains poorly understood and has important implications for Martian climate history. Martian meteorites contain trapped atmospheric gases that can be used to constrain both the timing and effectiveness of atmospheric escape processes. Here in this article, measurements of xenon isotopes in two ancient Martian meteorites, ALH 84001 and NWA 7034, are reported. The data indicate an early episode of atmospheric escape that mass fractionated xenon isotopes culminated within a few hundred million years of planetary formation, and little change to the atmospheric xenon isotopic composition has occurred since this time. In contrast, on Earth atmospheric xenon fractionation continued for at least two billion years (Pujol et al., 2011). Such differences in atmospheric Xe fractionation between the two planets suggest that climate conditions on Mars may have differed significantly from those on Archean Earth. For example, the hydrogen escape flux may not have exceeded the threshold required for xenon escape on Mars after 4.2–4.3 Ga, which indicates that Mars may have been significantly drier than Earth after this time.
Research Organization:
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
Sponsoring Organization:
National Aeronautic and Space Administration (NASA); USDOE
Grant/Contract Number:
AC52-07NA27344
OSTI ID:
1430989
Alternate ID(s):
OSTI ID: 1549412
Report Number(s):
LLNL-JRNL--711257
Journal Information:
Earth and Planetary Science Letters, Journal Name: Earth and Planetary Science Letters Journal Issue: C Vol. 479; ISSN 0012-821X
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (5)

Strange messenger: A new history of hydrogen on Earth, as told by Xenon text January 2018
Origin and evolution of the atmospheres of early Venus, Earth and Mars journal May 2018
Geologic Constraints on Early Mars Climate journal January 2019
Chronology of martian breccia NWA 7034 and the formation of the martian crustal dichotomy journal May 2018
Archean kerogen as a new tracer of atmospheric evolution: Implications for dating the widespread nature of early life journal February 2018

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