10:45 AM - 12:15 PM
[MIS20-P03] Insights from a geomorphological comparison between terrestrial and martian eskers
Keywords:Earth, Mars, Esker
The length and planform of eskers could reflect meltwater drainage extent (Brennand, 2000). Long and dendritic eskers can be deposited in extensive and synchronous drainage systems where sufficient supplies of meltwater and sediment are maintained. On the other hand, short and subparallel can be deposited in limited drainage systems. As for sinuosity, longer eskers tend to be straight may indicate pressurized conditions under thicker ice and vice versa (Storrar et al., 2014). Esker spacing is partly controlled by the transmissivity of the substrate (Boulton et al., 2007, 2009). Additionally, as for cross-sectional crest morphology, the sharpness of the ridge crest may indicate meltwater flow magnitude because a balance between ice creep closure and opening by viscous heating of meltwater flow governs subglacial channels in which esker deposited (Shreve, 1985; Perkins et al., 2016). To date, however, no comprehensive and large-scale classification which combines planform and crest morphology for terrestrial and martian eskers has been constructed.
In the present study, we undertake morphometric mappings and analyses of aspects of planform morphology and cross-sectional crest morphology along Laurentide eskers in comparison with martian eskers in the south circumpolar Dorsa Argentea Formation. We carry out the mapping from ArcticDEM (Porter et al., 2018), a digital surface model of the Arctic, in a geographic information system software.