Effect of Solution pH and Chloride Concentration on Akaganeite Precipitation: Implications for Akaganeite Formation on Mars

Akaganeite, a chloride‐bearing Fe(III) (hydr)oxide, has been reported on Mars in Yellowknife Bay in Gale crater by X‐ray diffraction (XRD), in Robert Sharp crater by Compact Reconnaissance Imaging Spectrometer for Mars, and possibly at the Gusev crater and Meridiani Planum by combined Mössbauer and...

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Bibliographic Details
Published in:Journal of geophysical research. Planets 2018-08, Vol.123 (8), p.2211-2222
Main Authors: Peretyazhko, T. S., Ming, D. W., Rampe, E. B., Morris, R. V., Agresti, D. G.
Format: Article
Language:English
Subjects:
Acidic oxides
akaganeite
Basalt
Chemical precipitation
CheMin
Chloride
Chromatography
CRISM
Dissolution
Environmental conditions
formation
Hematite
Infrared analysis
Infrared spectroscopy
Iron
Mars
Mars craters
Mineralogy
Minerals
Mossbauer
Mossbauer spectroscopy
Organic chemistry
Oxidation
Perchlorate
Plains
Precipitation
Saline solutions
Sulfides
X-ray diffraction
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Summary:Akaganeite, a chloride‐bearing Fe(III) (hydr)oxide, has been reported on Mars in Yellowknife Bay in Gale crater by X‐ray diffraction (XRD), in Robert Sharp crater by Compact Reconnaissance Imaging Spectrometer for Mars, and possibly at the Gusev crater and Meridiani Planum by combined Mössbauer and bulk chemistry analyses. Because formation conditions remain unknown, we investigated akaganeite precipitation as a function of solution pH and chloride concentration. Akaganeite was synthesized through hydrolysis of Fe(III) perchlorate in the presence of 0.02, 0.05, and 0.1 M chloride and at initial solution pH of 1.6, 4, 6, and 8 at 90 °C. Mineralogy of the precipitated Fe(III) (hydr)oxides was characterized by XRD, infrared spectroscopy, and Mössbauer spectroscopy. Total chloride and perchlorate contents were determined by ion chromatography. XRD revealed that akaganeite formed alone or in mixtures with ferrihydrite, hematite, and/or goethite at initial pH 1.6 with 0.02, 0.05, and 0.1 M Cl− and at initial pH from 4 to 8 with 0.05 and 0.1 M Cl−. Infrared analysis showed that akaganeite bands at ~2 and ~2.45 μm were sensitive to amount of akaganeite, total chloride content, and presence of other Fe(III) (hydr)oxides. The results indicate that akaganeite in Yellowknife Bay in Gale crater likely formed under acidic to alkaline (1.6 
ISSN:2169-9097
2169-9100
DOI:10.1029/2018JE005630