Recent Near-Neutral Chemical Weathering of Martian High-Latitude Surfaces

Details Recent Near-Neutral Chemical Weathering of Martian High-Latitude Surfaces Recent Near-Neutral Chemical Weathering of Martian High-Latitude Surfaces

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufm.p21a..05k&link_type=abstract

American Geophysical Union, Fall Meeting 2006, abstract #P21A-05

Mathematics

Logic

5410 Composition (1060, 3672), 5415 Erosion And Weathering, 5464 Remote Sensing, 5470 Surface Materials And Properties, 6225 Mars

Scientific paper

Recent scientific investigations of Mars, including those conducted by TES, OMEGA, and the MER lander missions, have expanded the discussion about aqueous alteration on Mars. Results from these missions indicate that the styles and/or intensity of water-rock interactions on Mars have changed over time, and they provide evidence for geographical differences in weathering typically associated with latitude. Work that we have done on the spectroscopy of terrestrial weathering rinds and rock coatings indicates that small volumes of weathering products mixed with primary minerals considerably change thermal emission spectra of volcanic rocks. Based on that work, we suggest that low-intensity chemical weathering leading to the formation of small volumes of weathering products can explain the global distribution of TES observations. Whereas MER results indicate acidic alteration at low latitudes since the late Noachian, we suggest that major surface- mineralogical differences observed by TES (and broadly corroborated by OMEGA) may be due to near-neutral pH chemical weathering, pedogenically driven by near-surface pore waters at mid-to-high latitudes.

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