Complex Processes and Environments as seen in the Scarp and Aureole Deposit of Olympus Mons

Details Complex Processes and Environments as seen in the Scarp and Aureole Deposit of Olympus Mons Complex Processes and Environments as seen in the Scarp and Aureole Deposit of Olympus Mons

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufm.p31b0435n&link_type=abstract

American Geophysical Union, Fall Meeting 2007, abstract #P31B-0435

Other

5470 Surface Materials And Properties, 6225 Mars

Scientific paper

Enigmatic features previously identified off the western slope of Olympus Mons and recently imaged with Hi-RISE provide clues to the history of the global dust cycle and changing surface environments. The most effective means of interpreting the surface history and physical properties of unique surface materials is from a multi- spectral point of view, in which geomorphology, composition, and surface properties are combined from different instruments and observations. In combining THEMIS with higher-resolution observations from MOC and Hi-RISE, we are able to compare the texture, brightness and thermophysical characteristics to take a more comprehensive perspective, and develop a detailed relative surface history. A MOC mosaic was used to map the layers, dust mantle, and blocks of uniform materials on a broad scale. New Hi-RISE images (PSP-003450-1975, PSP-003806-1975, and PSP-002461-1975) provide information that make the interpretation of these surfaces more complex, as the increase in resolution reveals additional episodes of modification and smaller-scale features. The juxtaposition of moderate-inertia features with low-inertia, dust-mantled surfaces allows for detailed mapping and interpretation of processes and associated erosional or depositional surfaces. Some of the most interesting features are the string of moderate-inertia dark spots in the aureole deposit and the extremely low- inertia layer exposed above the Olympus Rupes scarp. Evidence of homogeneous resistant blocks surrounded by a field of ripples on eroded dunes and other features indicate that these surfaces are the most recent and active in the low-inertia regions. Information from on and off the dark spots reveal complex morphologies in which cross-cutting relationships and correlations can be used to resolve a minimum of seven surface environments or events since the original emplacement. This history includes erosion of the original surface, deposition of regional layered deposits, and at least three separate episodes of eolian modification. The most recent process is complex, involving the activation of dark sand which stands in stark contrast to the surrounding dust-mantled surfaces.

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