Characterizing viscous creep deformation of Martian landforms in Noachis and Hellas using MOC and MOLA data

Details Characterizing viscous creep deformation of Martian landforms in Noachis and Hellas using MOC and MOLA data Characterizing viscous creep deformation of Martian landforms in Noachis and Hellas using MOC and MOLA data

May 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agusm.p42a..10t&link_type=abstract

American Geophysical Union, Spring Meeting 2002, abstract #P42A-10

Physics

3210 Modeling, 5470 Surface Materials And Properties, 6225 Mars, 1823 Frozen Ground

Scientific paper

The presence of widespread "softened" terrain and large-scale debris flows on Mars has long been attributed to viscous creep and flow phenomena associated with near-surface ground ice in high latitude permafrost terrain. On the basis of Viking Orbiter images, Squyres (1989) identified two classes of creep-related landforms: (1) softened terrain, which results from in situ viscous deformation and is particularly evident in impact craters which exhibit degraded rims and flat topographic profiles, and (2) debris flows, which are produced by mass wasting along escarpments, e.g., lobate debris aprons, lineated valley fill, and concentric crater fill. Such features have been linked with evidence of ground ice in the upper hundreds of meters of soil at higher latitudes, with depths to the top of the ice less than 100-200 m (Squyres et al., 1992). We are using MOC and MOLA data to document the structural and topographic characteristics of softened landforms and debris flows in the Hellas and Noachis regions. By comparing the observed landforms to the results of finite-element models of viscous creep relaxation which incorporate recent laboratory measurements of ice/rock mixtures (Durham et al., 1997, 2000; Mangold et al., 1999), we can constrain the conditions necessary to allow such deformation on Mars. Durham W.B. (1997), JGR, 102, 16293-16302. Durham W.B. (2000) Second Intl. Conf. on Mars Polar Sci. and Exploration, LPI Contribution #1057, 28-29. Mangold N. (1999) LPSC, XXX, #1016. Squyres S. (1989) Icarus, 79, 229-288. Squyres S. (1992) in Mars, Ed. H Kieffer, Univ.Arizona Press, Tucson, 523-554.

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