Physics
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufm.p41b1378m&link_type=abstract
American Geophysical Union, Fall Meeting 2008, abstract #P41B-1378
Physics
5405 Atmospheres (0343, 1060), 5419 Hydrology And Fluvial Processes, 5462 Polar Regions, 5475 Tectonics (8149), 5480 Volcanism (6063, 8148, 8450)
Scientific paper
Aqueous processes have been inferred at the Libya Montes rim/terrace complex of the southern Isidis Basin due to the dense concentration of valley networks [1]. Coordinated CRISM-HiRISE investigations of this region characterized discrete units of ancient phyllosilicate deposits covered by an olivine-rich material and a pyroxene caprock [2]. CRISM mapping data show minor phyllosilicate abundances widespread throughout the Southern Highlands [3], which are dominated by low-Ca pyroxene bearing material [4,5]. The layered capping materials have been suggested to be remnant eroded lavas that infiltrated the Libya Montes and Isidis Basin from Syrtis Major [6]. Our current study involves detailed characterization of the minerals present at Libya Montes through implementation of newly created data analysis tools. We have developed an automated procedure for modeling spectral features using Gaussians. This study builds on the modified Gaussian model (MGM) technique [7] that has been successfully applied to hyperspectral analyses of Mars [8]. However, these models require user-selected initial parameters. Initial efforts in automating this modeling process for CRISM hyperspectral images has been successful, but is limited to the study of pyroxene bands at 2 μm. We have extended this technique to model spectral features using Gaussians from 0.5-2.6 μm. We have developed an automatic parameter initialization step based on the features of the spectrum being modeled in order to further automate MGM modeling. Initial results have successfully yielded automatically generated starting parameters for the MGM with low residuals following optimization. This new algorithm is currently being applied towards analyses of hyperspectral images in Libya Montes. Specifically, olivine, pyroxene, and phyllosilicate deposits are being modeled and classified by composition in 13 CRISM images using the automatic parameter initialization with the MGM. We are investigating and mapping mineral compositions in this region and comparing them to those observed for the greater Isidis region. References [1]Crumpler, L. S., and K. L. Tanaka (2003) J. Geophys. Res., 108, DOI: 8010.1029/2002JE002040. [2]Bishop, J. L., et al. (2007) 7th Int'l Mars Conf. [3]Mustard, J. F., et al. (2008) Nature, 454, 07305. [4]Bibring, J.-P., et al. (2005) Science, 307,1576. [5]Mustard, J. F., et al.(2005) Science, 307, 1594. [6]Tornabene, et al. (2008) J. Geophys. Res., DOI:10.1029/2007JE002988, in press. [7]Sunshine, J. M., et al. (1990) J. Geophys. Res., 95, 6955. [8]Mustard, J., and J. M. Sunshine (1995) Science, 267, 1623.
Bishop Janice L.
Makarewicz Heather D.
Parente Mimmo
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