Evidence for Adsorption of Chlorine Species on Iron (III) (Hydr)oxides in the Sheepbed Mudstone, Gale Crater, Mars.
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| Title: | Evidence for Adsorption of Chlorine Species on Iron (III) (Hydr)oxides in the Sheepbed Mudstone, Gale Crater, Mars. |
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| Authors: | Peretyazhko, T. S.1 tanya.peretyazhko@nasa.gov, Ralston, S. J.1, Sutter, B.1, Ming, D. W.2 |
| Source: | Journal of Geophysical Research. Planets. May2020, Vol. 125 Issue 5, p1-15. 15p. |
| Subject Terms: | Gale Crater (Mars), Martian craters, Chlorine analysis, Ferric hydroxides, Mudstone, Martian geology |
| Abstract: | Ancient aquatic environments in Yellowknife Bay, Gale crater, Mars, could create favorable conditions for adsorption of chlorine compounds (perchlorate and chloride) on Fe (III) (hydr)oxides present in the Sheepbed mudstone, such as akaganeite and ferrihydrite. In this work, 5.2 mM ClO4− and 1.7 to 12 mM Cl− were adsorbed onto ferrihydrite and 5.2 mM ClO4− was adsorbed onto akaganeite at ultraacidic (pH 2–2.5), acidic (pH 3.8–4.5), and near‐neutral (pH 6.2–7.7) pH. Samples were characterized by evolved gas analysis and compared to the data collected for the Cumberland sample from the Sheepbed mudstone. Evolved gas analysis showed that ferrihydrite with 0.5–1 wt.% ClO4− adsorbed under ultraacidic and acidic conditions had a well‐resolved O2 peak at 306 °C due to the thermal decomposition of adsorbed ClO4−. All akaganeite samples with 0.5 wt.% adsorbed ClO4− had a weak peak at 312 °C tentatively assigned to decomposing perchlorate. Evolved gas analysis demonstrated that 0.5–2 wt.% Cl− adsorbed on ferrihydrite at ultraacidic and acidic pH was the main contributor to HCl evolved at >470 °C. Comparison with martian observations indicated that the temperature of the O2 peak originating from ClO4− adsorbed on ferrihydrite matched well with the thermal evolution of O2 from the Cumberland. Evolved HCl originating from Cl− adsorbed on ferrihydrite was within the temperature range of the high‐temperature HCl release from Cumberland (~770 °C). These observations suggest that ferrihydrite containing adsorbed ClO4− and Cl− could exist in the mudstone. Experimental results are consistent with adsorption at acidic pH < 4 environments through postdepositional water‐rock interactions of ferrihydrite with acid‐sulfate groundwater containing dissolved chloride and perchlorate. Plain Language Summary: Chlorine species such as chloride and perchlorate are detected in Gale crater on Mars. However, the chemical nature of these species is still not well understood. We hypothesized that perchlorate and chloride could be adsorbed on Fe (III) (hydr)oxides present in Gale crater. To verify this hypothesis, we investigated adsorption on ferrihydrite and akaganeite and characterized adsorbed species with analytical techniques similar to those used on Curiosity rover. Our data indicate that adsorption of perchlorate and chloride on ferrihydrite is consistent with observations from Gale crater. These results can be used to constrain aqueous conditions on early Mars: Adsorption likely took place as a result of ferrihydrite interaction with acidic groundwater. Key Points: Ferrihydrite with adsorbed ClO4− and Cl− could be present in the Sheepbed mudstoneThermal decomposition of adsorbed ClO4− and Cl− may be responsible for thermally evolved O2 and HCl in the Sheepbed mudstoneAdsorption likely occurred in acidic environments [ABSTRACT FROM AUTHOR] |
| Copyright of Journal of Geophysical Research. Planets is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
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| Header | DbId: 8gh DbLabel: GreenFILE An: 143431555 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Evidence for Adsorption of Chlorine Species on Iron (III) (Hydr)oxides in the Sheepbed Mudstone, Gale Crater, Mars. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Peretyazhko%2C+T%2E+S%2E%22">Peretyazhko, T. S.</searchLink><relatesTo>1</relatesTo><i> tanya.peretyazhko@nasa.gov</i><br /><searchLink fieldCode="AR" term="%22Ralston%2C+S%2E+J%2E%22">Ralston, S. J.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Sutter%2C+B%2E%22">Sutter, B.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Ming%2C+D%2E+W%2E%22">Ming, D. W.</searchLink><relatesTo>2</relatesTo> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Journal+of+Geophysical+Research%2E+Planets%22">Journal of Geophysical Research. Planets</searchLink>. May2020, Vol. 125 Issue 5, p1-15. 15p. – Name: Subject Label: Subject Terms Group: Su Data: <searchLink fieldCode="DE" term="%22Gale+Crater+%28Mars%29%22">Gale Crater (Mars)</searchLink><br /><searchLink fieldCode="DE" term="%22Martian+craters%22">Martian craters</searchLink><br /><searchLink fieldCode="DE" term="%22Chlorine+analysis%22">Chlorine analysis</searchLink><br /><searchLink fieldCode="DE" term="%22Ferric+hydroxides%22">Ferric hydroxides</searchLink><br /><searchLink fieldCode="DE" term="%22Mudstone%22">Mudstone</searchLink><br /><searchLink fieldCode="DE" term="%22Martian+geology%22">Martian geology</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: Ancient aquatic environments in Yellowknife Bay, Gale crater, Mars, could create favorable conditions for adsorption of chlorine compounds (perchlorate and chloride) on Fe (III) (hydr)oxides present in the Sheepbed mudstone, such as akaganeite and ferrihydrite. In this work, 5.2 mM ClO4− and 1.7 to 12 mM Cl− were adsorbed onto ferrihydrite and 5.2 mM ClO4− was adsorbed onto akaganeite at ultraacidic (pH 2–2.5), acidic (pH 3.8–4.5), and near‐neutral (pH 6.2–7.7) pH. Samples were characterized by evolved gas analysis and compared to the data collected for the Cumberland sample from the Sheepbed mudstone. Evolved gas analysis showed that ferrihydrite with 0.5–1 wt.% ClO4− adsorbed under ultraacidic and acidic conditions had a well‐resolved O2 peak at 306 °C due to the thermal decomposition of adsorbed ClO4−. All akaganeite samples with 0.5 wt.% adsorbed ClO4− had a weak peak at 312 °C tentatively assigned to decomposing perchlorate. Evolved gas analysis demonstrated that 0.5–2 wt.% Cl− adsorbed on ferrihydrite at ultraacidic and acidic pH was the main contributor to HCl evolved at >470 °C. Comparison with martian observations indicated that the temperature of the O2 peak originating from ClO4− adsorbed on ferrihydrite matched well with the thermal evolution of O2 from the Cumberland. Evolved HCl originating from Cl− adsorbed on ferrihydrite was within the temperature range of the high‐temperature HCl release from Cumberland (~770 °C). These observations suggest that ferrihydrite containing adsorbed ClO4− and Cl− could exist in the mudstone. Experimental results are consistent with adsorption at acidic pH < 4 environments through postdepositional water‐rock interactions of ferrihydrite with acid‐sulfate groundwater containing dissolved chloride and perchlorate. Plain Language Summary: Chlorine species such as chloride and perchlorate are detected in Gale crater on Mars. However, the chemical nature of these species is still not well understood. We hypothesized that perchlorate and chloride could be adsorbed on Fe (III) (hydr)oxides present in Gale crater. To verify this hypothesis, we investigated adsorption on ferrihydrite and akaganeite and characterized adsorbed species with analytical techniques similar to those used on Curiosity rover. Our data indicate that adsorption of perchlorate and chloride on ferrihydrite is consistent with observations from Gale crater. These results can be used to constrain aqueous conditions on early Mars: Adsorption likely took place as a result of ferrihydrite interaction with acidic groundwater. Key Points: Ferrihydrite with adsorbed ClO4− and Cl− could be present in the Sheepbed mudstoneThermal decomposition of adsorbed ClO4− and Cl− may be responsible for thermally evolved O2 and HCl in the Sheepbed mudstoneAdsorption likely occurred in acidic environments [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Journal of Geophysical Research. Planets is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1029/2019JE006220 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 15 StartPage: 1 Subjects: – SubjectFull: Gale Crater (Mars) Type: general – SubjectFull: Martian craters Type: general – SubjectFull: Chlorine analysis Type: general – SubjectFull: Ferric hydroxides Type: general – SubjectFull: Mudstone Type: general – SubjectFull: Martian geology Type: general Titles: – TitleFull: Evidence for Adsorption of Chlorine Species on Iron (III) (Hydr)oxides in the Sheepbed Mudstone, Gale Crater, Mars. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Peretyazhko, T. S. – PersonEntity: Name: NameFull: Ralston, S. J. – PersonEntity: Name: NameFull: Sutter, B. – PersonEntity: Name: NameFull: Ming, D. W. IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 05 Text: May2020 Type: published Y: 2020 Identifiers: – Type: issn-print Value: 21699097 Numbering: – Type: volume Value: 125 – Type: issue Value: 5 Titles: – TitleFull: Journal of Geophysical Research. Planets Type: main |
| ResultId | 1 |
