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

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

Dec 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003georl..30xpla5k&link_type=abstract

Geophysical Research Letters, Volume 30, Issue 24, pp. PLA 5-1, CiteID 2288, DOI 10.1029/2003GL018848

Physics

26

Planetary Sciences: Composition, Planetary Sciences: Remote Sensing, Planetary Sciences: Surface Materials And Properties, Mineral Physics: Optical, Infrared, And Raman Spectroscopy, Planetology: Solar System Objects: Mars

Scientific paper

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 <10 μm thick effectively mask the spectral contribution of a silicate substrate. Therefore, the capability of volumetrically small amounts of silica present as thin coatings on rocks should be considered when seeking explanations for spectral variability of Martian surface materials.

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