Computer Science
Scientific paper
Jun 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998icar..133..174s&link_type=abstract
Icarus, Volume 133, Issue 2, pp. 174-183.
Computer Science
47
Scientific paper
Thermal emission spectra from four locations on Mercury's surface are compared with three new laboratory emission spectra: two spinels (gahnite and magnetite) and one carbonaceous chondrite (Allende). The mineral and meteorite choices were made to investigate previously suggested unique scenarios for the evolution of Mercury's surface. No resemblance of the Mercury data were seen to the measured emission spectra. We also compare Mercury spectra to a selection of inverted reflectance spectra of feldspars, feldspathoids, Apollo 16 lunar breccias, nepheline-bearing alkali syenite, and simple two-component linear mixes of feldspars and pyroxenes. The Mercury spectra obtained from locations centered near 40 deg and 45 deg mercurian longitude and equatorial latitudes are concave upward in shape between 8 and 10 μm like that of nepheline but the emissivity maxima of the data occur at shorter wavelength than any of the feldspathoids (nepheline, leucite, sodalite). A good match of the wavelength position of Mercury's emissivity maxima is provided by the nepheline-bearing alkali syenite. Comparisons to several feldspars in the plagioclase series, and plagioclase and pyroxene lunar breccia (67031 and 67455), and linear mixing models of plagioclase and pyroxene provide good matches to some features near ~120 deg and ~34 deg mercurian longitude and equatorial latitudes. More conclusive interpretation of these data from Mercury requires laboratory studies of emission spectra obtained specifically for thermal and insolation conditions appropriate for airless bodies.
Roush Ted L.
Sprague Ann L.
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