Mathematics – Logic
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufm.p41a1353b&link_type=abstract
American Geophysical Union, Fall Meeting 2008, abstract #P41A-1353
Mathematics
Logic
0720 Glaciers, 0799 General Or Miscellaneous, 5415 Erosion And Weathering, 5416 Glaciation, 5419 Hydrology And Fluvial Processes
Scientific paper
The landscape of the Argyre Planitia and adjoining Charitum and Nereidum Montes in the Martian southern hemisphere has been heavily modified since its formation. Major landforms in Argyre have previously been interpreted as glacial in origin. We re-examine morphologies in this region using MOLA topographic datasets and new details revealed in HiRISE images and discuss the implications for glacial processes. Parallel linear grooves (that often crosscut large bedrock features), and streamlined hills (that often have wider uphill and thinner downhill ends), are oriented approximately downhill and are consistent with glacial erosion. Deep semi-circular embayments in mountains resemble terrestrial cirques. Broad U-shaped valleys have stepped longitudinal profiles and tributary valleys have hanging valley morphology similar to terrestrial glacial valleys. Large boulders blanketing a valley floor may be ground moraine deposited by ice ablation. Sinuous ridges in southern Argyre cross topographic divides, form map patterns similar to terrestrial eskers, often have layers and occur in troughs, and are thus consistent with glacio-fluvial processes. In particular, variations in sinuous ridge height appear to be related to the surrounding surface slope. This is a characteristic commonly observed in terrestrial eskers. Glacial interpretations are supported by the location of these collective landforms at >50°S, and their association with other landforms typical of glaciated landscapes such as lobate debris aprons interpreted as debris covered glaciers or rock glaciers. At least portions of Argyre appear to have been modified by ice accumulation, glacial flow, erosion, deposition, stagnation and ablation. The type and significant amount of bedrock erosion and the presence of possible eskers suggests that the ice was, at times, wet-based. The number of superimposed craters is consistent with geologically-recent glacial activity, but may also be due to subsequent modification from non-glacial processes.
Baker Victor R.
Banks Maria Elaine
Grant Alex J.
Gulick Virginia Claire
Jaeger Windy L.
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