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

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

May 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007georl..3410204r&link_type=abstract

Geophysical Research Letters, Volume 34, Issue 10, CiteID L10204

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25

Planetary Sciences: Solid Surface Planets: Composition (1060, 3672), Planetary Sciences: Solid Surface Planets: Remote Sensing, Planetary Sciences: Solid Surface Planets: Instruments And Techniques, Planetary Sciences: Solar System Objects: Mars

Scientific paper

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 absorption. We exploit the relative transparency of this spectral region to develop two indices that in tandem, distinguish between certain smectites and amorphous phases. Smectites are not detected in northern lowlands type 2 settings, consistent with other datasets, but the case for primary or secondary amorphous silica phases is strengthened. Separately, one index reveals an abundance of isolated type 2 occurrences in the southern high-latitudes (>50°) associated with dunes, the other shows olivine concentrations between -40° and +30°.

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