Encyclopedia of Planetary Landforms

2015 Edition
| Editors: Henrik Hargitai, Ákos Kereszturi

Sublimation-Type Polygon

Reference work entry
DOI: https://doi.org/10.1007/978-1-4614-3134-3_553

Definition

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.

Note

“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)).

Description

Generally found as a network of enclosed polygonal shapes bounded by trough-like depressions up to 3 m deep,...

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References

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Copyright information

© Springer Science+Business Media New York 2015

Authors and Affiliations

  1. 1.Space Exploration DevelopmentCanadian Space AgencySaint-HubertCanada