Identification of clays, quartz and sulfates on the surface of Mars from IRIS Mariner 9 spectra

Mathematics – Logic

Scientific paper

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Scientific paper

After correction for an instrumental effect, IRIS data can give information on the soil mineralogic composition if one is sure to eliminate, or to take in due account, the properties of atmospheric dust. We have defined 2 parameters, G and D, which allow us to study and classify the spectra. Spectra with G big (and negative), and D close to zero , give us properties of the soil. In this cases (180 spectra out of 21000 of IRIS) we can identify minerals by comparing single spectra (or averages over few cases) with the emissivity measured in the Lab by TES people. Several clays, quartz and sulfates can be identified in the soil in this way, in any case a minority of the 180 spectra.

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