Pyrolysis of Oxalate, Acetate, and Perchlorate Mixtures and the Implications for Organic Salts on Mars

Autor: Melissa Guzman, Paul R. Mahaffy, A. Das, R. Williams, Cherie N. Achilles, C. A. Knudson, Slavka Andrejkovičová, Amy McAdam, J. M. T. Lewis, Brad Sutter, E. B. Rampe, Heather B. Franz, Maeva Millan, J. L. Eigenbrode, G. M. Wong, P. D. Archer
Přispěvatelé: Department of Physics and Astronomy [Washington], Howard University, NASA Goddard Space Flight Center (GSFC), Center for Research and Exploration in Space Science and Technology [GSFC] (CRESST), Department of Geosciences [PennState], College of Earth and Mineral Sciences, Pennsylvania State University (Penn State), Penn State System-Penn State System-Pennsylvania State University (Penn State), Penn State System-Penn State System, Jacobs Technology ESCG, Department of Biology [Washington], Georgetown University [Washington] (GU), Center for Research and Exploration in Space Science and Technology [College Park] (CRESST), University of Maryland [College Park], University of Maryland System-University of Maryland System, PLANETO - LATMOS, Laboratoire Atmosphères, Milieux, Observations Spatiales (LATMOS), Sorbonne Université (SU)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS), International Space University (ISU), NASA Johnson Space Center (JSC), NASA, Universities Space Research Association (USRA), Center for GeoBioSciences, GeoTechnologies and GeoEngineering (GEOBIOTEC), Universidade de Aveiro
Rok vydání: 2021
Předmět:
Zdroj: Journal of Geophysical Research. Planets
Journal of Geophysical Research. Planets, Wiley-Blackwell, 2021, ⟨10.1029/2020JE006803⟩
Journal of Geophysical Research. Planets, Wiley-Blackwell, 2021, 126 (4), pp.e2020JE006803. ⟨10.1029/2020JE006803⟩
ISSN: 2169-9100
2169-9097
DOI: 10.1029/2020je006803
Popis: International audience; Organic salts, such as Fe, Ca, and Mg oxalates and acetates, may be widespread radiolysis and oxidation products of organic matter in Martian surface sediments. Such organic salts are challenging to identify by evolved gas analysis but the ubiquitous CO2 and CO in pyrolysis data from the Sample Analysis at Mars (SAM) instrument suite on the Curiosity rover indirectly points to their presence. Here, we examined laboratory results from SAM‐like analyses of organic salts as pure phases, as trace phases mixed with silica, and in mixtures with Ca and Mg perchlorates. Pure oxalates evolved CO2 and CO, while pure acetates evolved CO2 and a diverse range of organic products dominated by acetone and acetic acid. Dispersal within silica caused minor peak shifting, decreased the amounts of CO2 evolved by the acetate standards, and altered the relative abundances of the organic products of acetate pyrolysis. The perchlorate salts scrubbed Fe oxalate CO releases and shifted the CO2 peaks to lower temperatures, whereas with Ca and Mg oxalate, a weaker CO release was observed but the initial CO2 evolutions were largely unchanged. The perchlorates induced a stronger CO2 release from acetates at the expense of other products. Oxalates evolved ∼47% more CO2 and acetates yielded ∼69% more CO2 when the perchlorates were abundant. The most compelling fits between our organic salt data and SAM CO2 and CO data included Martian samples acquired from modern eolian deposits and sedimentary rocks with evidence for low‐temperature alteration.
Databáze: OpenAIRE
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