Meteorite constraints on Martian atmospheric loss and paleoclimate
Journal Article
·
· Earth and Planetary Science Letters
- 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
| Strange messenger: A new history of hydrogen on Earth, as told by Xenon | text | January 2018 |
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Geologic Constraints on Early Mars Climate
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Chronology of martian breccia NWA 7034 and the formation of the martian crustal dichotomy
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Archean kerogen as a new tracer of atmospheric evolution: Implications for dating the widespread nature of early life
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