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Iron oxide and hydroxide precipitation from ferrous solutions and its relevance to Martian surface mineralogyExperiments 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.
Document ID
Document Type
Reprint (Version printed in journal)
Posey-Dowty, J.
(Princeton Univ. NJ, United States)
Moskowitz, B.
(Princeton Univ. NJ, United States)
Crerar, D.
(Princeton Univ. NJ, United States)
Hargraves, R.
(Princeton Univ. NJ, United States)
Tanenbaum, L.
(Princeton University NJ, United States)
Date Acquired
August 12, 2013
Publication Date
April 1, 1986
Publication Information
Publication: Icarus
Volume: 66
ISSN: 0019-1035
Subject Category
Lunar And Planetary Exploration
Funding Number(s)
Distribution Limits
No Preview Available