Spectral characterization of weathering products of elemental iron in a Martian atmosphere: Implications for Mars hyperspectral studies

Visible and near-infrared spectroscopic properties have been measured on elemental iron experimentally weathered in simulated Martian atmosphere and correlated to mineralogical compositions determined by X-ray diffraction. Two main features are observed in the reflectance spectra, corresponding to t...

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Bibliographic Details
Published in:Planetary and space science 2006-09, Vol.54 (11), p.1034-1045
Main Authors: Chevrier, V., Roy, R., Le Mouélic, S., Borschneck, D., Mathé, P.E., Rochette, P.
Format: Article
Language:English
Subjects:
Carbonates
Iron (oxy)hydroxides
Mars
Reflectance spectroscopy
Weathering
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Summary:Visible and near-infrared spectroscopic properties have been measured on elemental iron experimentally weathered in simulated Martian atmosphere and correlated to mineralogical compositions determined by X-ray diffraction. Two main features are observed in the reflectance spectra, corresponding to two deep bands located at 0.9 and 3.1 μm, respectively the iron band and the hydration band. In early weathering stages both Fe 2+ and Fe 3+ bands are identified. In addition, whereas the water band position does not change with time, the Fe 2+ band disappears, and the Fe 3+ band shifts towards longer wavelength (from 0.88 to 0.92 μm) because of transition from Fe 2+ phases (siderite) to Fe 3+ phases (ferrihydrite and goethite). Apart from these spectral signatures, other bands more specific of each phase are not clearly evidenced, especially for siderite. This is due to relatively low abundance of siderite (
ISSN:0032-0633
1873-5088
DOI:10.1016/j.pss.2005.12.019