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Evidence for indigenous nitrogen in sedimentary and aeolian deposits from the Curiosity rover investigations at Gale crater, Mars

By Jennifer C. Stern, Brad Sutter, Caroline Freissinet, Rafael Navarro-González, Christopher P. Mckay, P. Douglas Archer, Arnaud Buch, Anna E. Brunner, Patrice Coll, Jennifer L. Eigenbrode, Alberto G. Fairen, Heather B. Franz, Daniel P. Glavin, Srishti Kashyap, Amy C. Mcadam, Douglas W. Ming, Andrew Steele, Cyril Szopa, James J. Wray, F. Javier Martín-Torres, Maria-Paz Zorzano, Pamela G. Conrad and Paul R. Mahaffy

Abstract

International audienceThe Sample Analysis at Mars (SAM) investigation on the Mars Science Laboratory (MSL) Curiosity rover has detected oxidized nitrogen-bearing compounds during pyrolysis of scooped aeolian sediments and drilled sedimentary deposits within Gale crater. Total N concentrations ranged from 20 to 250 nmol N per sample. After subtraction of known N sources in SAM, our results support the equivalent of 110–300 ppm of nitrate in the Rocknest (RN) aeolian samples, and 70–260 and 330–1,100 ppm nitrate in John Klein (JK) and Cumberland (CB) mudstone deposits, respectively. Discovery of indigenous martian nitrogen in Mars surface materials has important implications for habitability and, specifically, for the potential evolution of a nitrogen cycle at some point in martian history. The detection of nitrate in both wind-drifted fines (RN) and in mudstone (JK, CB) is likely a result of N2 fixation to nitrate generated by thermal shock from impact or volcanic plume lightning on ancient Mars. Fixed nitrogen could have facilitated the development of a primitive nitrogen cycle on the surface of ancient Mars, potentially providing a biochemically accessible source of nitrogen

Topics: [ SDU.ASTR.EP ] Sciences of the Universe [physics]/Astrophysics [astro-ph]/Earth and Planetary Astrophysics [astro-ph.EP]
Publisher: National Academy of Sciences
Year: 2015
DOI identifier: 10.1073/pnas.1420932112
OAI identifier: oai:HAL:insu-01149378v1
Provided by: Hal-Diderot
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