Other
Scientific paper
Aug 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989jgr....9410159b&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 94, Aug. 10, 1989, p. 10159-10166.
Other
51
Astronomical Spectroscopy, Carbonates, Mars Surface, Planetary Composition, Absorption Spectra, Calcium Carbonates, Magnesium Compounds, Spectral Bands, Spectral Reflectance, Mars, Carbonates, Earth-Based Observations, Surface, Syrtis Major Planum, Hellas Planitia, Arabia Terra, Reflectance, Spectra, Absorption, Models, Thermal Effects, Laboratory Studies, Comparisons, Maps, Concentrations, Spectroscopy, Theoretical Studies, Thermal Properties
Scientific paper
Results are presented from a search for carbonates and other salts on the surface of Mars, using the 2.2-m telescope at the Mauna Kea Observatory (Hawaii) for observations, in the 2.6 to 4.2 micron spectral region, within four Mars areas, including Syrtis Major, Hellas, Arabia, and an area northeast of Hellas. Shallow depressions in the reflectance spectra of two partially overlapping areas (the overlap of which contains Syrtis Planum) were observed between 3.8 and 3.9 microns (i.e., in the region where carbonate absorptions appear), the strength of which is consistent with the presence of 5 to 10 wt pct magnesium carbonate in the upper few millimeters of Mars soil. However, the depressions are slightly shorter in wavelength and broader in shape than the magnesium carbonate band. The depressions are too short in wavelength to be caused by calcium carbonate. Results of these and earlier observations do not rule out carbonates below the surface in other locations, or in concentrations of less than 3 to 5 percent in the areas observed.
Blaney Diana L.
McCord Thomas B.
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