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Pyrolysis of Oxalate, Acetate, and Perchlorate Mixtures and the Implications for Organic Salts on Mars
Journal of Geophysical Research: Planets ( IF 4.8 ) Pub Date : 2021-03-30 , DOI: 10.1029/2020je006803 J. M. T. Lewis 1, 2, 3 , J. L. Eigenbrode 2 , G. M. Wong 4 , A. C. McAdam 2 , P. D. Archer 5 , B. Sutter 5 , M. Millan 2, 6 , R. H. Williams 2, 3, 7 , M. Guzman 8 , A. Das 9 , E. B. Rampe 10 , C. N. Achilles 2, 11 , H. B. Franz 2 , S. Andrejkovičová 12 , C. A. Knudson 2, 3, 7 , P. R. Mahaffy 2
Journal of Geophysical Research: Planets ( IF 4.8 ) Pub Date : 2021-03-30 , DOI: 10.1029/2020je006803 J. M. T. Lewis 1, 2, 3 , J. L. Eigenbrode 2 , G. M. Wong 4 , A. C. McAdam 2 , P. D. Archer 5 , B. Sutter 5 , M. Millan 2, 6 , R. H. Williams 2, 3, 7 , M. Guzman 8 , A. Das 9 , E. B. Rampe 10 , C. N. Achilles 2, 11 , H. B. Franz 2 , S. Andrejkovičová 12 , C. A. Knudson 2, 3, 7 , P. R. Mahaffy 2
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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.
中文翻译:
草酸盐,乙酸盐和高氯酸盐混合物的热解及其对火星中有机盐的影响
Fe,Ca和Mg草酸盐和乙酸盐等有机盐可能是火星表面沉积物中有机物的广泛辐射分解和氧化产物。这种有机盐很难通过逸出气体分析来鉴定,但是来自好奇号流动站上火星样品分析(SAM)仪器套件中的热解数据中普遍存在的CO 2和CO间接指出了它们的存在。在这里,我们检查了类似有机盐的SAM样分析的实验室结果,这些有机盐为纯相,痕量相与二氧化硅混合,以及与Ca和Mg高氯酸盐混合而成。纯草酸盐会生成CO 2和CO,而纯乙酸盐会生成CO 2以及以丙酮和乙酸为主的各种有机产品。分散在二氧化硅中会引起较小的峰移动,减少乙酸根标准品释放的CO 2量,并改变乙酸根热解有机产物的相对丰度。高氯酸盐清除了草酸铁的CO释放并将CO 2峰移至较低的温度,而草酸钙和草酸镁则观察到较弱的CO释放,但最初的CO 2释放基本上没有变化。高氯酸盐从乙酸盐中释放出更强的CO 2释放力,而其他产品却以该价格为代价。草酸盐产生的CO 2增加约47%,乙酸盐产生的CO 2增加约69%。当高氯酸盐丰富时。我们的有机盐数据与SAM CO 2和CO数据之间最引人注目的拟合包括从现代风成矿床和沉积岩中获得的火星样品,这些样品具有低温蚀变的证据。
更新日期:2021-04-22
中文翻译:
草酸盐,乙酸盐和高氯酸盐混合物的热解及其对火星中有机盐的影响
Fe,Ca和Mg草酸盐和乙酸盐等有机盐可能是火星表面沉积物中有机物的广泛辐射分解和氧化产物。这种有机盐很难通过逸出气体分析来鉴定,但是来自好奇号流动站上火星样品分析(SAM)仪器套件中的热解数据中普遍存在的CO 2和CO间接指出了它们的存在。在这里,我们检查了类似有机盐的SAM样分析的实验室结果,这些有机盐为纯相,痕量相与二氧化硅混合,以及与Ca和Mg高氯酸盐混合而成。纯草酸盐会生成CO 2和CO,而纯乙酸盐会生成CO 2以及以丙酮和乙酸为主的各种有机产品。分散在二氧化硅中会引起较小的峰移动,减少乙酸根标准品释放的CO 2量,并改变乙酸根热解有机产物的相对丰度。高氯酸盐清除了草酸铁的CO释放并将CO 2峰移至较低的温度,而草酸钙和草酸镁则观察到较弱的CO释放,但最初的CO 2释放基本上没有变化。高氯酸盐从乙酸盐中释放出更强的CO 2释放力,而其他产品却以该价格为代价。草酸盐产生的CO 2增加约47%,乙酸盐产生的CO 2增加约69%。当高氯酸盐丰富时。我们的有机盐数据与SAM CO 2和CO数据之间最引人注目的拟合包括从现代风成矿床和沉积岩中获得的火星样品,这些样品具有低温蚀变的证据。