Abstract :
[en] The article presents a summary of the present state of knowledge of perennial periglacial mounds, including descriptions of the external appearance and internal composition of pingos and palsas and a discussion of the genetic mechanisms. Pingos appear to be the result of the freezing of a mass of water trapped beneath permafrost under cryostatic or hydraulic pressure. Palsas are formed by the migration of groundwater to a freezing plane (cryosuction). The existence of mineral palsas is recognized; in this case the peat cover may be extremely thin or even totally non‐existent.
Funders :
National Council for Scientific Research: 111National Research Council Canada: 431National Research Council Canada: 432National Research Council Canada: 1073National Council for Scientific Research: 1130,1964
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