Sublimation polygons are a type of thermal contraction crack polygon that form in ice-rich substrates found in extremely arid and cold regions such as the Dry Valleys of Antarctica (Kowalewski et al. 2012). Unlike the more typical ice-wedge, sand-wedge, or composite-wedge polygons typically found in continuous permafrost environments, the bounding troughs deepen primarily through sublimation of underlying ground ice.
“Sublimation polygon” is not a universally accepted standard term in the periglacial literature. The formation and evolution of these features is subject to intense debate within the planetary geomorphic community. For the purposes of this entry, we consider a sublimation polygon as a subset of thermal contraction crack polygons (see encyclopedia entries for Sand-Wedge Polygon and Thermal Contraction Crack Polygons (Permafrost)).
Generally found as a network of enclosed polygonal shapes bounded by trough-like depressions up to 3 m deep,...
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