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A Global View of Martian Surface Compositions from MGS-TES
Joshua L. Bandfield,*
Victoria E. Hamilton,
Philip R. Christensen
Thermal Emission Spectrometer (TES) data from the Mars
Global Surveyor (MGS) are used to determine compositions and
distributionsof martian low-albedo regions. Two surface spectral
signaturesare identified from low-albedo regions. Comparisons with
spectraof terrestrial rock samples and deconvolution results indicatethat the two compositions are a basaltic composition dominatedby
plagioclase feldspar and clinopyroxene and an andesitic compositiondominated by plagioclase feldspar and volcanic glass. The distributionof the two compositions is split roughly along the planetary dichotomy.The basaltic composition is confined to older surfaces, and themore
silicic composition is concentrated in the younger northernplains.
Department of Geology, Arizona State University, Tempe, AZ
85287-1404, USA.
*
To whom correspondence should be addressed. E-mail:
joshband{at}asu.edu
The editors suggest the following Related Resources on Science sites:
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Richard L. S. Taylor; and David W. Mittlefehldt (13 October 2000) Science290 (5490), 273c.
[DOI: 10.1126/science.290.5490.273c] |Full Text »
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