Encyclopedia of Planetary Landforms

2015 Edition
| Editors: Henrik Hargitai, Ákos Kereszturi

Sand-Wedge Polygon

Reference work entry
DOI: https://doi.org/10.1007/978-1-4614-3134-3_326

Definition

A polygon outlined by sand wedges underlying its boundaries.

Category

Synonyms

 Sand-filled polygon; Soil-wedge polygon (not recommended: tessellation, tundra polygon, “Taimyr” polygon)

Description

Sand-filled frost-fissure polygon net. Similar to ice-wedge polygons, their troughs have raised rims.

Morphometry

On Earth, open cracks can be 1–100 mm wide, 2–5 m or more deep, and 1 m to several tens of meters long (Mackay 1974; Murton 1996). Typical is a raised rim on either side of the fissure. Sometimes the rim may be as much as 0.5–1.0 m high. In plain view, the cracks form orthogonal or non-orthogonal networks, according to the kind of angles where cracks or their projections intersect, and complete or incomplete, depending on whether the cracks join (Lachenbruch 1962). Polygon diameter varies from a few meters to >100 m.

Subtypes

  1. (1)

    Primary filling (this entry)

     
  2. (2)
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References

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  15. Washburn AL (1979) Geocryology. Edward Arnold, London, 406 pGoogle Scholar

Copyright information

© Springer Science+Business Media New York 2015

Authors and Affiliations

  1. 1.Department of Geology and MeteorologyUniversity of PécsPécsHungary