Mathematics – Logic
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufm.p43b1395m&link_type=abstract
American Geophysical Union, Fall Meeting 2008, abstract #P43B-1395
Mathematics
Logic
5410 Composition (1060, 3672), 5464 Remote Sensing, 5470 Surface Materials And Properties, 6225 Mars
Scientific paper
Aram Chaos is a 280 km wide Martian crater centered at 2.5N, 338.5E. This crater is filled by chaotic terrains, overlain by a presently dome-shaped layered, 900 m thick formation, displaying spectral signatures of ferric oxides and sulfates on TES and OMEGA data (Glotch et al. 2005, JGR 110, E09006). In a previous study (Masse et al. 2008, JGR in press), using OMEGA, MOLA, MOC, TES, THEMIS and CTX data, we proposed that the presently dome-shaped formation is composed of a bright material that contains both monohydrated sulfates and ferric oxides. After its emplacement, this formation has been grooved down to various depths by large aeolian erosion corridors. The borders of the corridors are steep linear cliffs where the bright, layered, sulfate-rich material crops out. These cliffs are also partially covered by dark debris fans, which originate from the bright formation itself and which feed dark sand sheets covering the lowest stratigraphic levels of the bright formation. We therefore infer that the dark ferric oxide sand sheets and debris fans are erosional products of the bright formation. We therefore infer that the dark ferric oxide sand sheets and debris fans are erosional products of the bright formation. Due to the relatively low spatial resolution of OMEGA, it is not possible to analyse the exact composition of the cliffs. The aim of the present work is to refine these results and to compare them with newly acquired, high resolution, hyperspectral data from the Mars Reconnaissance Orbiter Compact Reconnaissance Imaging Spectrometer for Mars (CRISM). CRISM data confirm the mineralogical conclusions made with OMEGA data. Moreover, CRISM data allow the detection of a new layer, containing an Al-OH bearing mineral, at the bottom of this dome-shaped formation.
Bibring J.
Bourgeois Olivier
Combe J.
Gondet Brigitte
Langevin Yves
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