Iron-montmorillonite - A spectral analog of Martian soil

Details Iron-montmorillonite - A spectral analog of Martian soil Iron-montmorillonite - A spectral analog of Martian soil

Feb 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985lpsc...15..771b&link_type=abstract

(Lunar and Planetary Institute, NASA, American Geophysical Union, et al., Lunar and Planetary Science Conference, 15th, Houston,

Physics

10

Mars Surface Samples, Montmorillonite, Planetary Geology, Spectrum Analysis, Absorption Spectra, Infrared Spectra, Iron, Spectral Reflectance, Ultraviolet Spectra, Visible Spectrum, Mars, Soil, Analogs, Optical Properties, Spectra, Light (Visible), Absorption, Reflectance, Clays, Ions, Wavelengths, Experiments, Ultraviolet, Infrared, Dust, Comparisons, Iron, Opacity, Mineralogy

Scientific paper

Spectral data for smectite clays, particularly for montmorillonite, which contain various adsorbed ions and are measured in the UV, VIS, and NIR ranges are analyzed and compared with Martian soil and dust spectra. It is shown that the structural octahedral iron in smectite clays affects their light absorbance in the UV at 240-260 nm, which results from an O(2-) to Fe(3+) charge transfer, similar to one observed in the Martian spectrum. Adsorbed iron affects, via crystal field absorptions, the reflectance of montmorillonite in the VIS and NIR ranges, resulting in stronger absorption and higher opacity in the range 0.40-0.65 micron. Both in spectral contrast and presence of (or lack of) spectral features, the Fe-montmorillonite spectra in the VIS and NIR are in reasonable agreement with the Martian spectrum. It is found that the spectral characteristics of iron-saturated smectite clays cannot be used to preclude the presence of clays in Martian soils and dust.

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