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Constraining the preservation of organic compounds in Mars analog nontronites after exposure to acid and alkaline fluids

The presence of organic matter in lacustrine mudstone sediments at Gale crater was revealed by the Mars Science Laboratory Curiosity rover, which also identified smectite clay minerals. Analogue experiments on phyllosilicates formed under low temperature aqueous conditons have illustrated that these...

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Autores principales: Gil-Lozano, Carolina, Fairén, Alberto G., Muñoz-Iglesias, Victoria, Fernández-Sampedro, Maite, Prieto-Ballesteros, Olga, Gago-Duport, Luis, Losa-Adams, Elisabeth, Carrizo, Daniel, Bishop, Janice L., Fornaro, Teresa, Mateo-Martí, Eva
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7492362/
https://www.ncbi.nlm.nih.gov/pubmed/32934272
http://dx.doi.org/10.1038/s41598-020-71657-9
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author Gil-Lozano, Carolina
Fairén, Alberto G.
Muñoz-Iglesias, Victoria
Fernández-Sampedro, Maite
Prieto-Ballesteros, Olga
Gago-Duport, Luis
Losa-Adams, Elisabeth
Carrizo, Daniel
Bishop, Janice L.
Fornaro, Teresa
Mateo-Martí, Eva
author_facet Gil-Lozano, Carolina
Fairén, Alberto G.
Muñoz-Iglesias, Victoria
Fernández-Sampedro, Maite
Prieto-Ballesteros, Olga
Gago-Duport, Luis
Losa-Adams, Elisabeth
Carrizo, Daniel
Bishop, Janice L.
Fornaro, Teresa
Mateo-Martí, Eva
author_sort Gil-Lozano, Carolina
collection PubMed
description The presence of organic matter in lacustrine mudstone sediments at Gale crater was revealed by the Mars Science Laboratory Curiosity rover, which also identified smectite clay minerals. Analogue experiments on phyllosilicates formed under low temperature aqueous conditons have illustrated that these are excellent reservoirs to host organic compounds against the harsh surface conditions of Mars. Here, we evaluate whether the capacity of smectites to preserve organic compounds can be influenced by a short exposure to different diagenetic fluids. We analyzed the stability of glycine embedded within nontronite samples previously exposed to either acidic or alkaline fluids (hereafter referred to as “treated nontronites”) under Mars-like surface conditions. Analyses performed using multiple techniques showed higher photodegradation of glycine in the acid-treated nontronite, triggered by decarboxylation and deamination processes. In constrast, our experiments showed that glycine molecules were preferably incorporated by ion exchange in the interlayer region of the alkali-treated nontronite, conferring them a better protection against the external conditions. Our results demonstrate that smectite previously exposed to fluids with different pH values influences how glycine is adsorbed into their interlayer regions, affecting their potential for preservation of organic compounds under contemporary Mars surface conditions.
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spelling pubmed-74923622020-09-16 Constraining the preservation of organic compounds in Mars analog nontronites after exposure to acid and alkaline fluids Gil-Lozano, Carolina Fairén, Alberto G. Muñoz-Iglesias, Victoria Fernández-Sampedro, Maite Prieto-Ballesteros, Olga Gago-Duport, Luis Losa-Adams, Elisabeth Carrizo, Daniel Bishop, Janice L. Fornaro, Teresa Mateo-Martí, Eva Sci Rep Article The presence of organic matter in lacustrine mudstone sediments at Gale crater was revealed by the Mars Science Laboratory Curiosity rover, which also identified smectite clay minerals. Analogue experiments on phyllosilicates formed under low temperature aqueous conditons have illustrated that these are excellent reservoirs to host organic compounds against the harsh surface conditions of Mars. Here, we evaluate whether the capacity of smectites to preserve organic compounds can be influenced by a short exposure to different diagenetic fluids. We analyzed the stability of glycine embedded within nontronite samples previously exposed to either acidic or alkaline fluids (hereafter referred to as “treated nontronites”) under Mars-like surface conditions. Analyses performed using multiple techniques showed higher photodegradation of glycine in the acid-treated nontronite, triggered by decarboxylation and deamination processes. In constrast, our experiments showed that glycine molecules were preferably incorporated by ion exchange in the interlayer region of the alkali-treated nontronite, conferring them a better protection against the external conditions. Our results demonstrate that smectite previously exposed to fluids with different pH values influences how glycine is adsorbed into their interlayer regions, affecting their potential for preservation of organic compounds under contemporary Mars surface conditions. Nature Publishing Group UK 2020-09-15 /pmc/articles/PMC7492362/ /pubmed/32934272 http://dx.doi.org/10.1038/s41598-020-71657-9 Text en © The Author(s) 2020 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.
spellingShingle Article
Gil-Lozano, Carolina
Fairén, Alberto G.
Muñoz-Iglesias, Victoria
Fernández-Sampedro, Maite
Prieto-Ballesteros, Olga
Gago-Duport, Luis
Losa-Adams, Elisabeth
Carrizo, Daniel
Bishop, Janice L.
Fornaro, Teresa
Mateo-Martí, Eva
Constraining the preservation of organic compounds in Mars analog nontronites after exposure to acid and alkaline fluids
title Constraining the preservation of organic compounds in Mars analog nontronites after exposure to acid and alkaline fluids
title_full Constraining the preservation of organic compounds in Mars analog nontronites after exposure to acid and alkaline fluids
title_fullStr Constraining the preservation of organic compounds in Mars analog nontronites after exposure to acid and alkaline fluids
title_full_unstemmed Constraining the preservation of organic compounds in Mars analog nontronites after exposure to acid and alkaline fluids
title_short Constraining the preservation of organic compounds in Mars analog nontronites after exposure to acid and alkaline fluids
title_sort constraining the preservation of organic compounds in mars analog nontronites after exposure to acid and alkaline fluids
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7492362/
https://www.ncbi.nlm.nih.gov/pubmed/32934272
http://dx.doi.org/10.1038/s41598-020-71657-9
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