Other
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufm.p13d1558m&link_type=abstract
American Geophysical Union, Fall Meeting 2007, abstract #P13D-1558
Other
5464 Remote Sensing, 5470 Surface Materials And Properties, 6225 Mars
Scientific paper
Large exposures of Al- and Fe/Mg-phyllosilicates have been identified in the Mawrth Vallis region using data from OMEGA (Poulet, F., Bibring, J.- P., Mustard, J. F., Gendrin, A., Mangold, N., Langevin, Y., Arvidson, R. E., Gondet, B. & Gomez, C., 2005, Nature, 438, 632-627; Noe Dobrea and Michalski, 2006, AGU Fall Meeting 2006, #P23D-009; Loizeau et al 2007, JGR, 112 (E8), 10.1029/2006JE002877) and CRISM. Regional mapping with CRISM multispectral data shows an excellent correlation with OMEGA results. The higher-resolution CRISM multispectral mapping data improve upon the OMEGA detections, finding additional, smaller deposits. We have identified several Al- and Fe/Mg-phyllosilicate minerals in three 5x5 degree multispectral map tiles projected at 256 pixels per degree and high-resolution hyperspectral images HRS307A and FRT4ECA. HRS307A lies within the southern part of the main channel and contains units exposed by channel creation, allowing us to study its depositional history. FRT4ECA is northeast of HRS307A, just south of the northern part of the main channel and contains knob-type features not seen in abundance in other Mawrth images. In FRT4ECA, Fe/Mg-phyllosilicates such as nontronite have been identified using the characteristic absorptions at 2.41um, 2.28um, 1.91um, and 1.42um and Al-phyllosilicates such as montmorillonite by the characteristic absorptions at 2.21 um, 1.91 um, and 1.41um. These two minerals occur in two distinct layers and are consistent with mineral species identified in other regions of Mawrth, implying wide-spread deposition in an aqueous environment rather than local hydrothermal alteration. Smaller exposures of other phyllosilicates such as kaolinite and ferrosaponite have also been observed indicating a variety of aqueous processes in this region.
Bibring J.
Bishop Janice L.
CRISM Team
Ehlmann Bethany L.
Hash Christopher
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