Basaltic andesite , altered basalt , and a TES-based search for smectite clay minerals on Mars

  title={Basaltic andesite , altered basalt , and a TES-based search for smectite clay minerals on Mars},
  author={Steven W. Ruff and P. R. Christensen},
[1] The global-scale surface type 2 unit first identified with the Mars Global Surveyor Thermal Emission Spectrometer (TES) remains enigmatic. Competing hypotheses suggest that it represents either basaltic andesite or some form of altered basalt rich in dioctahedral smectite clay minerals and/or spectrally similar amorphous silica phases. Common dioctahedral smectites contain a diagnostic feature in a portion of TES spectra that has been excluded in previous studies because of atmospheric CO2… CONTINUE READING


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