The origin of pingos in regions of thick permafrost, Western Canadian Arctic
peer reviewed The presence of pingos in regions of thick and continuous permafrost is often explained by the freezing of a talik previously developed be¬neath a standing water body, usually a lake. These pingos are generally referred to as “Mackenzie Delta” or closed system type pingos. A number of...
| Main Authors: | , |
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| Format: | Article in Journal/Newspaper |
| Language: | English |
| Published: |
Adam Mickiewicz University press
1977
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| Subjects: | |
| Online Access: | https://orbi.uliege.be/handle/2268/248067 https://orbi.uliege.be/bitstream/2268/248067/1/Quaestiones%20Geographicae%201977.pdf |
| Summary: | peer reviewed The presence of pingos in regions of thick and continuous permafrost is often explained by the freezing of a talik previously developed be¬neath a standing water body, usually a lake. These pingos are generally referred to as “Mackenzie Delta” or closed system type pingos. A number of pingos studied in the islands of the Western Cana¬dian Arctic indicate that the conditions for fav¬ourable closed system pingo growth are much more varied. For example, pingos situated on low terra¬ces of the Thomsen River in north central Banks Island (73° N) probably developed following the lateral migration of the river and the freezing of a talik which had formed beneath the channel (Fig. 2). Two near parallel pingo-like ridges deve¬loped on the lower part of the gentler slope of an asymmetrical valley in southern Banks Island (71° N) are thought also to have formed by the freezing of sub-channel taliks at times when the stream migrated laterally to produce the valley asymmetry (Fig. 6). On Prince Patrick Island, elon¬gate pingos located near the coast at Satellite Bay (77° N), formed following fluctuations of sea level and the inundation of river valleys (Fig. 7). Other pingos, located in the central parts of Prince Partie Island (76° N), appear related to the presence of deep faults in the underlying bedrock at a time when permafrost was aggrading (Fig. 9). Those pingos thought related to the evolution of streams often exhibit an elongate, ridge-like form. |
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