Physics – Optics
Scientific paper
Dec 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufm.p31d1720a&link_type=abstract
American Geophysical Union, Fall Meeting 2011, abstract #P31D-1720
Physics
Optics
[5464] Planetary Sciences: Solid Surface Planets / Remote Sensing, [5470] Planetary Sciences: Solid Surface Planets / Surface Materials And Properties, [6225] Planetary Sciences: Solar System Objects / Mars
Scientific paper
The Opportunity Mars Exploration Rover has traversed over 30 km across Meridiani Planum since January 2004, acquiring numerous remote sensing and in-situ measurements of rocks and soils at dozens of locations. Over the past year Mars Reconnaissance Orbiter CRISM (0.362 to 3.92 micrometer imaging spectrometer) observations have been used to directly support planning of Opportunity traverses and locations for detailed remote sensing and in-situ measurements. As part of these coordinated observations CRISM's gimbaled optics have been used to spatially oversample acquisition of image data in the along-track direction (ATO or along track oversampled observations). This new acquisition mode allows sharpening the spatial detail from the normal ~18 m/pixel observations to values as small as ~6 m/pixel, with due formal consideration of the decrease in S/N with decreasing pixel sizes for retrieval of the 544 band spectra for each pixel. CRISM ATO observations have been acquired over western rim segments of the Noachian Endeavour crater to follow-up on initial identification of Fe/Mg smectite clay mineral(s) using normal mode CRISM data and reported by Wray et al. (GRL, 2009). The sedimentary deposits that have been the focus of measurements by Opportunity unconformably overlie and bury most of Endeavour crater, with the exception of the rim segments. Sharpened ATO observations reduced to surface reflectance values using formal radiative transfer procedures to model atmospheric gases and aerosols pinpoint the locations of Fe/Mg smectite clays in Cape Tribulation and Cape York rim segments. Results show that the smectite-bearing deposits are on the in-board or Endeavour side of the rim segments, away from sedimentary covers that dominate the western sides of the rims. Opportunity is traversing to Cape York and is slightly less than 2 km away as of the writing of this abstract. We expect to report on results from Opportunity's measurements on Cape York, focusing on the synergistic use of Opportunity and CRISM observations to understand the mineralogy and geologic history of the Noachian strata. Questions to be addressed include whether or not the Fe/Mg smectites formed by surface weathering, impact, or were formed in the subsurface and exposed by the Endeavour impact event.
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