Other
Scientific paper
Dec 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999baas...31.1590m&link_type=abstract
American Astronomical Society, DPS Meeting #31, late abstracts, #59.36; Bulletin of the American Astronomical Society, Vol. 31,
Other
Scientific paper
The surfaces of many solar system bodies are covered with a dusty regolith consisting of a multicomponent mixture of various materials. Some of these materials show absorption bands in their remotely obtained reflectance spectra. The analysis of such bands allows to identify the components and to determine their relative proportions. In particular, some empirical methods make it possible to derive the modal abundances of silicate minerals in their binary mixtures, based on the relative contrasts of their absorption bands. It was assumed that such techniques can be successfully applied to the analysis of more complex mixtures if other components are spectrally neutral (featureless). Up to now, nobody considered the possibility that such neutral components may affect the ratios of the band contrasts. We applied the Hapke nonlinear mixing to model the band contrasts and their ratios in binary and ternary mixtures containing a neutral component. The results show that not only the band contrasts, but also their ratios are sensitive to the presence of the featureless endmember. When a neutral phase is present, the use of relative band contrasts to estimate the modal abundance of endmembers results in systematic errors. To confirm this experimentally, we have performed spectral reflectance measurements of intimate olivine-orthopyroxene-pyrrhotite mixtures in the visible and near-infrared regions. The presence of the spectrally neutral pyrrhotite results in the underestimation of the orthopyroxene abundance when empirical calibration for binary olivine-orthopyroxene mixtures is applied. If spectrally featureless (especially opaque) phases are present, the spectral mixing modeling is a more correct way to estimate the modal abundances in the intimate mixture.
Arnold Gabriele
Moroz Lyuba
Waesch R.
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