Mathematics – Logic
Scientific paper
Dec 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003agufm.p21b0054w&link_type=abstract
American Geophysical Union, Fall Meeting 2003, abstract #P21B-0054
Mathematics
Logic
5410 Composition, 5464 Remote Sensing, 5499 General Or Miscellaneous
Scientific paper
Valles Marineris is one of three regions on Mars where TES has identified gray crystalline hematite. In the other two locations, Meridiani Planum and Aram Chaos, a strong correlation between the hematite distribution and geologic units has been found. We have used MOC, THEMIS, and MOLA data to determine if a similar correlation exists for hematite within Valles Marineris. After studying the larger patches of hematite within the canyons, we find a correlation between hematite abundance and distinctive geologic units for some patches, but not all. In Ophir and Candor Chasma, the hematite correlates to relatively brighter, dustier units in daytime THEMIS infrared images, but the correlation is moderate and other units with similar infrared properties have no corresponding hematite. Using the narrow angle MOC images, we have determined that the hematite signatures correspond to areas where patches of brighter material are exposed from beneath overlying dark units and dunes. This type of exhumation is similar to the hematite unit at Meridiani Planum. In Eos and Capri Chasma, the hematite appears to cross over geologic units seen in the THEMIS data sets, but no MOC images are available to assess the geology at the higher resolution. The presence of hematite also varies widely with topography, with one patch of hematite occurring across 2 km of relief in central Candor Chasma. In general, hematite occurs more prevalently on the canyon floors adjacent to the interior layered deposits, rather than on the layered deposits themselves. Our current results are based upon the hematite distribution map of Christensen et al. [J. Geophys. Res., 105, 9623-9642, 2000] but we hope to refine these TES compositional maps in order to more precisely correlate hematite to geologic features seen in the MOC and THEMIS data sets.
Anderson Scott F.
Lane Melissa
Weitz Catherine
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