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The formation of araneiforms by carbon dioxide venting and vigorous sublimation dynamics under martian atmospheric pressure
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The formation of araneiforms by carbon dioxide venting and vigorous sublimation dynamics under martian atmospheric pressure
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Journal Article
The formation of araneiforms by carbon dioxide venting and vigorous sublimation dynamics under martian atmospheric pressure
2021
Overview
The local redistribution of granular material by sublimation of the southern seasonal
CO
2
ice deposit is one of the most active surface shaping processes on Mars today. This unique geomorphic mechanism is hypothesised to be the cause of the dendritic, branching, spider-like araneiform terrain and associated fans and spots—features which are native to Mars and have no Earth analogues. However, there is a paucity of empirical data to test the validity of this hypothesis. Additionally, it is unclear whether some araneiform patterns began as radial and then grew outward, or whether troughs connected at mutual centres over time. Here we present the results of a suite of laboratory experiments undertaken to investigate if the interaction between a sublimating
CO
2
ice overburden containing central vents and a porous, mobile regolith will mobilise grains from beneath the ice in the form of a plume to generate araneiform patterns. We quantify the branching and area of the dendritic features that form. We provide the first observations of plume activity via
CO
2
sublimation and consequent erosion to form araneiform features. We show that
CO
2
sublimation can be a highly efficient agent of sediment transport under present day Martian atmospheric pressure and that morphometry is governed by the Shields parameter.
Publisher
Nature Publishing Group UK,Nature Publishing Group,Nature Portfolio
