Physics
Scientific paper
Sep 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978cuni.reptq....t&link_type=abstract
Final Report, 1 Sep. 1977 - 30 May 1978 Cornell Univ., Ithaca, NY. Center for Radiophysics and Space Research.
Physics
Infrared Spectrometers, Mars Surface Samples, Simulation, Spectral Signatures, X Ray Fluorescence, Mineralogy, Silicon Oxides, Spectrum Analysis, Viking Mars Program
Scientific paper
Mineralogy inferred from the Viking X-ray fluorescence spectrometry (XRFS) is compared with mineralogy indicated by spectral data. The comparison is done by taking laboratory spectra of Viking analog minerals. Both XRFS and infrared data are consistent with clays as the dominant SiO2 containing minerals on Mars. The X-ray fluorescence data might also be consistent with the dominance of certain mafic SiO2 igneous minerals, but the spectral data are probably inconsistent with such materials. Sulfates, inferred by XRFS, are consistent with the spectral data. Inferences following Mariner 9 that high-SiO2 minerals were important on Mars may have been biased by the presence of sulfates. Calcium carbonate, in the quantities indirectly suggested by XRFS are inconsistent with the spectral data, but smaller quantities of CaCO3 are consistent, as are large quantities of other carbonates.
Sagan Carl
Toon Brian O.
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