In situ measurement of atmospheric krypton and xenon on Mars with Mars Science Laboratory
- NASA Goddard Space Flight Center (GSFC), Greenbelt, MD (United States). Solar System Exploration Division
- NASA Goddard Space Flight Center (GSFC), Greenbelt, MD (United States). Solar System Exploration Division; Universities Space Research Association (USRA), Columbia, MD (United States)
- NASA Goddard Space Flight Center (GSFC), Greenbelt, MD (United States). Solar System Exploration Division; Center for Space Sciences and Technology (CRESST), Greenbelt, MD (United States)
- Univ. of Minnesota, Minneapolis, MN (United States)
- Open Univ., Milton Keynes (United Kingdom). Dept. of Environment, Earth and Ecosystems
- Univ. of Michigan, Ann Arbor, MI (United States). Climate and Space Sciences and Engineering
- NASA Johnson Space Center, Houston, TX (United States)
- Concordia Univ., Moorhead, MN (United States)
- Univ. of Hawaii, Honolulu, HI (United States)
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Mars Science Laboratory's Sample Analysis at Mars (SAM) investigation has measured all of the stable isotopes of the heavy noble gases krypton and xenon in the martian atmosphere, in situ, from the Curiosity Rover at Gale Crater, Mars. Previous knowledge of martian atmospheric krypton and xenon isotope ratios has been based upon a combination of the Viking mission's krypton and xenon detections and measurements of noble gas isotope ratios in martian meteorites. But, the meteorite measurements reveal an impure mixture of atmospheric, mantle, and spallation contributions. The xenon and krypton isotopic measurements reported here include the complete set of stable isotopes, unmeasured by Viking. Our new results generally agree with Mars meteorite measurements but also provide a unique opportunity to identify various non-atmospheric heavy noble gas components in the meteorites. Kr isotopic measurements define a solar-like atmospheric composition, but deviating from the solar wind pattern at 80Kr and 82Kr in a manner consistent with contributions originating from neutron capture in Br. The Xe measurements suggest an intriguing possibility that isotopes lighter than 132Xe have been enriched to varying degrees by spallation and neutron capture products degassed to the atmosphere from the regolith, and a model is constructed to explore this possibility. Such a spallation component, but, is not apparent in atmospheric Xe trapped in the glassy phases of martian meteorites.
- Research Organization:
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- Sponsoring Organization:
- National Aeronautics and Space Administration (NASA)
- Grant/Contract Number:
- AC52-06NA25396
- OSTI ID:
- 1417813
- Report Number(s):
- LA-UR-17-27690
- Journal Information:
- Earth and Planetary Science Letters, Vol. 454, Issue C; ISSN 0012-821X
- Publisher:
- ElsevierCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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