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Sedimentary Organics in Glen Torridon, Gale Crater, Mars: Results from the SAM Instrument Suite and Supporting Laboratory Analyses

Maeva Millan 1, 2, 3, * Amy J. Williams 4 Amy C Mcadam 3 Jennifer L. Eigenbrode 3 Andrew Steele 5 Caroline Freissinet 1 Daniel P. Glavin 3 Cyril Szopa 1 Arnaud Buch 6 Roger E. Summons 7 James M. T. Lewis 3, 8, 9 Gregory M. Wong 10 Christopher H. House 10 Brad Sutter 11 Ophélie Mcintosh 1 Alexander B. Bryk 12 Heather B. Franz 3 Chad I. Pozarycki 13, 3 Jennifer C. Stern 3 Rafael Navarro-González 14 P. Douglas Archer 11 Valerie Fox 13 Kristen A. Bennett 15 Samuel Teinturier 3, 16 Charles Malespin 3 Sarah Johnson 2 Paul R. Mahaffy 3 
Abstract : The Sample Analysis at Mars (SAM) suite instrument on board NASA’s Curiosity rover has characterized the inorganic and organic chemical composition of seven samples from the Glen Torridon clay-bearing unit. A variety of organic molecules were detected with SAM using pyrolysis (up to ~850°C) and wet chemistry experiments coupled with evolved gas analysis (EGA) and gas chromatography-mass spectrometry (GCMS). SAM EGA and GCMS analyses revealed a greater diversity and abundance of sulfur-bearing aliphatic and aromatic organic compounds in the sediments of this Gale crater unit than earlier in the mission. We also report the detection of nitrogen-containing, oxygen-containing, and chlorine- containing molecules, as well as polycyclic aromatic hydrocarbons found in Glen Torridon (GT), although the sources of some of these organics may be related to the presence of chemical reagents in the SAM instrument background. However, sulfur-bearing organics released at high temperature (>600°C) are likely derived from martian sources (e.g., igneous, hydrothermal, atmospheric, or biological) or exogenous sources and consistent with the presence of recalcitrant organic materials in the sample. The SAM measurements of the GT clay-bearing unit expand the inventory of organic matter present in Gale crater and is also consistent with the hypothesis that clay minerals played an important role in the preservation of ancient refractory organic matter on Mars. These findings deepen our understanding of the past habitability and biological potential of Gale crater.
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Submitted on : Monday, September 12, 2022 - 7:07:28 PM
Last modification on : Tuesday, December 6, 2022 - 4:09:42 AM

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Maeva Millan, Amy J. Williams, Amy C Mcadam, Jennifer L. Eigenbrode, Andrew Steele, et al.. Sedimentary Organics in Glen Torridon, Gale Crater, Mars: Results from the SAM Instrument Suite and Supporting Laboratory Analyses. Journal of Geophysical Research. Planets, 2022, e2021JE007107 (in press). ⟨10.1029/2021je007107⟩. ⟨insu-03775640⟩

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