Mathematics – Logic
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufm.p11e..05w&link_type=abstract
American Geophysical Union, Fall Meeting 2007, abstract #P11E-05
Mathematics
Logic
5464 Remote Sensing, 5470 Surface Materials And Properties
Scientific paper
Analysis of hyperspectral MRO CRISM and MEX OMEGA data from the fluvially-dissected Noachian cratered terrain to the south and west of the layered sedimentary sulfate deposits explored by the Opportunity rover shows clear evidence for phyllosilicate deposits. Specifically, exposures exhibit spectral features resulting from an Fe/Mg-OH vibration at ~ 2.3 microns and bound H2O at ~1.9 microns. In several locations, the phyllosilicates (ex. -3.1N°,-8.0E° and -3.4N°,-5.6E°) are located within ~20 kilometers of the edge of the hematite-bearing plains unit investigated by the Opportunity rover ~150km to the northeast. This is one of the few regions on Mars where a clear stratigraphic relationship between the phyllosilicate exposures and layered sulfates is observed, and this may record the transition to acid sulfate conditions on Mars. Continued analyses of the mineralogical composition and mapping of the spatial distribution of these phyllosilicate and sulfate deposits in Meridiani with CRISM, OMEGA, CTX, and HiRISE images will constrain the relative timing of the change in climatic and hydrologic regimes on Mars from fluvial conditions to an acid sulfate groundwater system. The spatial juxtaposition of phyllosilicate and sulfate deposits also provides a potentially important site for exploration by the Mars Science Laboratory, ExoMars, and other upcoming rover-based missions.
Andrews-Hanna Jeffrey C.
Arvidson Ray E.
CRISM Science Team
McEwen Alfred S.
Morris Richard V.
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