Age of growth of two pingos, Sarqaq Dalen, West Central Greenland
Abstract The aim of this note is to identify the beginnings of growth of two pingos located in Sarqaq Dalen, west‐central Greenland. One is located at the toe of an alluvial fan, and seems to be active; the other is on a river bed, and already collapsed. Marine sand covers the pingos and indicates t...
| Published in: | Permafrost and Periglacial Processes |
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| Main Author: | |
| Format: | Article in Journal/Newspaper |
| Language: | English |
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Wiley
1991
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| Online Access: | http://dx.doi.org/10.1002/ppp.3430020308 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fppp.3430020308 https://onlinelibrary.wiley.com/doi/pdf/10.1002/ppp.3430020308 |
| Summary: | Abstract The aim of this note is to identify the beginnings of growth of two pingos located in Sarqaq Dalen, west‐central Greenland. One is located at the toe of an alluvial fan, and seems to be active; the other is on a river bed, and already collapsed. Marine sand covers the pingos and indicates that the Holocene transgression predates their growth. The pingos are located approximately 2 km from the present coastline. Pollen analysis of the overlying sediments of the two pingos leads to the following conclusions: (1) although the study area had already emerged from the sea at Post Fjord stage (7800 years BP), it was submerged again sometime between 7000‐5000 years BP; (2) one pingo started its growth approximately 4500 years BP; (3) the other pingo started its growth approximately 6000‐5500 years BP. |
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