Iron oxide and hydroxide precipitation from ferrous solutions and its relevance to Martian surface mineralogy

Details Iron oxide and hydroxide precipitation from ferrous solutions and its relevance to Martian surface mineralogy Iron oxide and hydroxide precipitation from ferrous solutions and its relevance to Martian surface mineralogy

Apr 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986icar...66..105p&link_type=abstract

Icarus (ISSN 0019-1035), vol. 66, April 1986, p. 105-116. Research supported by the Shell Companies Foundation.

Physics

18

Aqueous Solutions, Hydroxides, Iron Oxides, Mars Surface, Mineralogy, Precipitation (Chemistry), Absorption Spectra, Chemical Composition, Infrared Spectra, Mars Atmosphere, Precipitates, Thermomagnetic Effects, Mars, Iron Oxide, Hydroxide, Precipitation, Surface, Laboratory Studies, Mineralogy, Physics, Chemistry, Formation, Lepidocrocite, Temperature, Goethite, Infrared, Wavelengths, Magnetic Methods, Analysis, Oxidation, Experiments, Electrostatic Effects, Regolith, Dehydration, Maghemite, Magnetic Prope

Scientific paper

Experiments were performed to examine if the ubiquitousness of a weak magnetic component in all Martian surface fines tested with the Viking Landers can be attributed to ferric iron precipitation in aqueous solution under oxidizing conditions at neutral pH. Ferrous solutions were mixed in deionized water and various minerals were added to separate liquid samples. The iron-bearing additives included hematite, goethite, magnetite, maghemite, lepidocrocite and potassium bromide blank at varying concentrations. IR spectroscopic scans were made to identify any precipitates resulting from bubbling oxygen throughout the solutions; the magnetic properties of the precipitates were also examined. The data indicated that the lepidocrocite may have been preferentially precipitated, then aged to maghemite. The process would account for the presumed thin residue of maghemite on the present Martian surface, long after abundant liquid water on the Martian surface vanished.

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