Tl. Roush et Jf. Bell, THERMAL EMISSION MEASUREMENTS 2000-400 CM-1 (5-25 MU-M) OF HAWAIIAN PALAGONITIC SOILS AND THEIR IMPLICATIONS FOR MARS, J GEO R-PLA, 100(E3), 1995, pp. 5309-5317
The thermal emission of two palagonitic soils, common visible and near
infrared spectral analogs for bright soils on Mars, was measured over
the wavelength range of 5 to 25 mu m (2000 to 400 cm(-1)) for several
particle size separates. All spectra exhibit emissivity features due
to vibrations associated with H2O and SiO. The maximum variability of
emissivity is approximate to 20% in the short wavelength region (5 to
6.5 mu m, 2000 to 1500 cm(-1)), and is more subdued, <4%, at longer wa
velengths. The strengths of features present in infrared spectra of Ma
rs cannot be solely provided by emissivity variations of palagonite; s
ome other material or mechanism must provide additional absorption(s).