Shrinkage Crack Polygon
Shrinkage crack polygon: structure appearing in sedimentary or volcanic rock layer formed by tension due to shrinkage, structure in soil layer formed by tension due to shrinkage of smectitic clay within layer.
Subaerial: formation of desiccation crack polygon due to pore water loss in drying sediment.
Thermal crack polygon: shrinkage crack polygon formed due to cooling in permafrost or lava.
Dehydration: crack polygon formed as a result of loss of crystallographic water, e.g., hydrated salts (Kargel 2004).
A type of patterned ground.
Crack Classification (Plummer and Gostin 1981): Cracks are orthogonal (or rectangular) when cracks intersect at 90° angles, and they are not propagated simultaneously, but slowly....
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