Evolved gas analyses of sedimentary rocks and eolian sediment in Gale Crater, Mars: Results of the Curiosity rover's sample analysis at Mars instrument from Yellowknife Bay to the Namib Dune
作者： B. Sutter , Amy C Mcadam , Paul R Mahaffy , Doug W Ming , Ken S Edgett
DOI: 10.1002/2016JE005225
关键词:
摘要: The Sample Analysis at Mars instrument evolved gas analyzer (SAM-EGA) has detected water, H2, SO2, H2S, NO, CO2, CO, O2 and HCl from two eolian sediments nine sedimentary rocks Gale Crater, Mars. These detections indicate nitrates, organics, oxychlorine phase, sulfates are widespread with phyllosilicates carbonates occurring in select Crater materials. Coevolved CO2 (160 ± 248 - 2373 820 μgC(CO2)/g), CO (11 3 320 130 μgC(CO)/g) suggest organic-C is present Five samples temperatures consistent carbonate (0.32± 0.05 0.70± 0.1 wt.% CO3). Evolved NO amounts to 0.002 0.007 0.06 0.03 NO3. Evolution of suggests phases (chlorate/perchlorate) (0.05 0.025 1.05 0.44wt. % ClO4) while SO2 evolution indicates the presence crystalline and/or poorly Fe- Mg-sulfate possibly sulfide. H2O (0.9 0.3 2.5 1.6 H2O) adsorbed hydrated salts, interlayer/structural water phyllosilicates, possible inclusion mineral/amorphous phases. H2 H2S reduced occur despite oxidized (nitrate, oxychlorine, sulfate, carbonate). SAM results coupled CheMin mineralogical APXS elemental analyses that have experienced a complex authigenetic/diagenetic history involving fluids varying pH, redox, salt composition. inferred geochemical conditions were favorable for microbial habitability if life ever existed, there was likely sufficient support small population.
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