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Semiarid climate and hyposaline lake on early Mars inferred from reconstructed water chemistry at Gale

Salinity, pH, and redox states are fundamental properties that characterize natural waters. These properties of surface waters on early Mars reflect palaeoenvironments, and thus provide clues on the palaeoclimate and habitability. Here we constrain these properties of pore water within lacustrine se...

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Autores principales: Fukushi, Keisuke, Sekine, Yasuhito, Sakuma, Hiroshi, Morida, Koki, Wordsworth, Robin
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6814795/
https://www.ncbi.nlm.nih.gov/pubmed/31653859
http://dx.doi.org/10.1038/s41467-019-12871-6
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author Fukushi, Keisuke
Sekine, Yasuhito
Sakuma, Hiroshi
Morida, Koki
Wordsworth, Robin
author_facet Fukushi, Keisuke
Sekine, Yasuhito
Sakuma, Hiroshi
Morida, Koki
Wordsworth, Robin
author_sort Fukushi, Keisuke
collection PubMed
description Salinity, pH, and redox states are fundamental properties that characterize natural waters. These properties of surface waters on early Mars reflect palaeoenvironments, and thus provide clues on the palaeoclimate and habitability. Here we constrain these properties of pore water within lacustrine sediments of Gale Crater, Mars, using smectite interlayer compositions. Regardless of formation conditions of smectite, the pore water that last interacted with the sediments was of Na-Cl type with mild salinity (~0.1–0.5 mol/kg) and circumneutral pH. To interpret this, multiple scenarios for post-depositional alterations are considered. The estimated Na-Cl concentrations would reflect hyposaline, early lakes developed in 10(4)–10(6)-year-long semiarid climates. Assuming that post-depositional sulfate-rich fluids interacted with the sediments, the redox disequilibria in secondary minerals suggest infiltration of oxidizing fluids into reducing sediments. Assuming no interactions, the redox disequilibria could have been generated by interactions of upwelling groundwater with oxidized sediments in early post-depositional stages.
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spelling pubmed-68147952019-10-28 Semiarid climate and hyposaline lake on early Mars inferred from reconstructed water chemistry at Gale Fukushi, Keisuke Sekine, Yasuhito Sakuma, Hiroshi Morida, Koki Wordsworth, Robin Nat Commun Article Salinity, pH, and redox states are fundamental properties that characterize natural waters. These properties of surface waters on early Mars reflect palaeoenvironments, and thus provide clues on the palaeoclimate and habitability. Here we constrain these properties of pore water within lacustrine sediments of Gale Crater, Mars, using smectite interlayer compositions. Regardless of formation conditions of smectite, the pore water that last interacted with the sediments was of Na-Cl type with mild salinity (~0.1–0.5 mol/kg) and circumneutral pH. To interpret this, multiple scenarios for post-depositional alterations are considered. The estimated Na-Cl concentrations would reflect hyposaline, early lakes developed in 10(4)–10(6)-year-long semiarid climates. Assuming that post-depositional sulfate-rich fluids interacted with the sediments, the redox disequilibria in secondary minerals suggest infiltration of oxidizing fluids into reducing sediments. Assuming no interactions, the redox disequilibria could have been generated by interactions of upwelling groundwater with oxidized sediments in early post-depositional stages. Nature Publishing Group UK 2019-10-25 /pmc/articles/PMC6814795/ /pubmed/31653859 http://dx.doi.org/10.1038/s41467-019-12871-6 Text en © The Author(s) 2019 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 license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license 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 license, visit http://creativecommons.org/licenses/by/4.0/.
spellingShingle Article
Fukushi, Keisuke
Sekine, Yasuhito
Sakuma, Hiroshi
Morida, Koki
Wordsworth, Robin
Semiarid climate and hyposaline lake on early Mars inferred from reconstructed water chemistry at Gale
title Semiarid climate and hyposaline lake on early Mars inferred from reconstructed water chemistry at Gale
title_full Semiarid climate and hyposaline lake on early Mars inferred from reconstructed water chemistry at Gale
title_fullStr Semiarid climate and hyposaline lake on early Mars inferred from reconstructed water chemistry at Gale
title_full_unstemmed Semiarid climate and hyposaline lake on early Mars inferred from reconstructed water chemistry at Gale
title_short Semiarid climate and hyposaline lake on early Mars inferred from reconstructed water chemistry at Gale
title_sort semiarid climate and hyposaline lake on early mars inferred from reconstructed water chemistry at gale
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6814795/
https://www.ncbi.nlm.nih.gov/pubmed/31653859
http://dx.doi.org/10.1038/s41467-019-12871-6
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