Planetary science (communication arising): Volcanism or aqueous alteration on Mars?

Details Planetary science (communication arising): Volcanism or aqueous alteration on Mars? Planetary science (communication arising): Volcanism or aqueous alteration on Mars?

Feb 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003natur.421..711h&link_type=abstract

Nature, Volume 421, Issue 6924, pp. 711-712 (2003).

Computer Science

10

Scientific paper

The Mars Global Surveyor's Thermal Emission Spectrometer has identified two global spectral surface types in martian dark regions, which were initially interpreted as being of basaltic (type 1) and intermediate (type 2, basaltic andesite to andesite) volcanic composition. Wyatt and McSween suggest that northern-hemisphere occurrences of the type-2 spectrum are instead representative of weathered basalt, on the basis of ambiguity in the spectral interpretation and overlap between the distribution of this material and the outline of a putative ancient ocean. Although the spectral data may be open to interpretation within the limits of current understanding, creating weathered basalt and explaining its distribution is problematic. These competing hypotheses have significantly different implications for the igneous and aqueous history of Mars, and it is important to continue debating the merits of each.

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