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Organic molecules in the Sheepbed Mudstone, Gale Crater, Mars
Solar System Exploration Division, NASA Goddard Space Flight Center, Greenbelt, Maryland.
Solar System Exploration Division, NASA Goddard Space Flight Center, Greenbelt, Maryland.
Solar System Exploration Division, NASA Goddard Space Flight Center, Greenbelt, Maryland.
Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, Cambridge.
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Number of Authors: 39
2015 (English)In: Journal of Geophysical Research - Planets, ISSN 2169-9097, E-ISSN 2169-9100, Vol. 120, no 3, 495-514 p.Article in journal (Refereed) Published
Abstract [en]

The Sample Analysis at Mars (SAM) instrument [Mahaffy et al., 2012] onboard the Mars Science Laboratory (MSL) Curiosity rover is designed to conduct inorganic and organic chemical analyses of the atmosphere and the surface regolith and rocks to help evaluate the past and present habitability potential of Mars at Gale Crater [Grotzinger et al., 2012]. Central to this task is the development of an inventory of any organic molecules present to elucidate processes associated with their origin, diagenesis, concentration and long-term preservation. This will guide the future search for biosignatures [Summons et al., 2011]. Here we report the definitive identification of chlorobenzene (150–300 parts per billion by weight (ppbw)) and C2 to C4 dichloroalkanes (up to 70 ppbw) with the SAM gas chromatograph mass spectrometer (GCMS), and detection of chlorobenzene in the direct evolved gas analysis (EGA) mode, in multiple portions of the fines from the Cumberland drill hole in the Sheepbed mudstone at Yellowknife Bay. When combined with GCMS and EGA data from multiple scooped and drilled samples, blank runs and supporting laboratory analog studies, the elevated levels of chlorobenzene and the dichloroalkanes cannot be solely explained by instrument background sources known to be present in SAM. We conclude that these chlorinated hydrocarbons are the reaction products of martian chlorine and organic carbon derived from martian sources (e.g. igneous, hydrothermal, atmospheric, or biological) or exogenous sources such as meteorites, comets or interplanetary dust particles.

Place, publisher, year, edition, pages
2015. Vol. 120, no 3, 495-514 p.
National Category
Aerospace Engineering
Research subject
Atmospheric science
Identifiers
URN: urn:nbn:se:ltu:diva-13016DOI: 10.1002/2014JE004737Scopus ID: 2-s2.0-84926442637Local ID: c2bdaf05-31e6-47cc-b952-79de2a2f3c45OAI: oai:DiVA.org:ltu-13016DiVA: diva2:985967
Note

Validerad; 2015; Nivå 2; 20150318 (ninhul)

Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2017-10-19Bibliographically approved

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