Effects of pure silica coatings on thermal emission spectra of basaltic rocks: Considerations for Martian surface mineralogy

On Mars, silica derived from chemical weathering could precipitate to coat rocks and particles. We suggest that rock coatings of secondary amorphous silica may account for a widespread Martian surface spectral unit previously modeled as andesite or weathered basalt. In a laboratory study, we investi...

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Bibliographic Details
Published in:Geophysical research letters 2003-12, Vol.30 (24), p.PLA5.1-n/a
Main Authors: Kraft, Michael D., Michalski, Joseph R., Sharp, Thomas G.
Format: Article
Language:English
Subjects:
Earth, ocean, space
Exact sciences and technology
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Summary:On Mars, silica derived from chemical weathering could precipitate to coat rocks and particles. We suggest that rock coatings of secondary amorphous silica may account for a widespread Martian surface spectral unit previously modeled as andesite or weathered basalt. In a laboratory study, we investigated the effects of synthetic silica coatings on thermal infrared (TIR) spectroscopic measurements. Secondary amorphous silica is spectrally similar to silicate glass and clay spectra used in previous spectroscopic models. Silica coating and substrate spectra combine nonlinearly to produce a composite spectrum of a coated rock. Silica coatings
ISSN:0094-8276
1944-8007
DOI:10.1029/2003GL018848