Palsas and Lithalsas

Palsas and lithalsas are mounds that contain lenses of segregation ice. They are islands of permafrost. These two kinds of mounds are very similar in shape, size, and origin. However, the palsas have a cover of peat which does not exist in lithalsas. The formation of ice in the core of these mounds...

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Bibliographic Details
Main Author: Pissart, Albert
Format: Article in Journal/Newspaper
Language:English
Published: Elsevier Inc. 2013
Subjects:
Aggradational ice
Frost thrusting
Lapland
Lithalsa
Mineral palsa
Northern Québec
Palsa
Periglacial mound
Remnant of lithalsas
Segregation ice
Physical
chemical
mathematical & earth Sciences
Earth sciences & physical geography
Physique
chimie
mathématiques & sciences de la terre
Sciences de la terre & géographie physique
Ice
palsa
palsas
permafrost
Online Access:https://orbi.uliege.be/handle/2268/250188
https://orbi.uliege.be/bitstream/2268/250188/1/Palsas%20and%20Lithalsasppa.pdf
https://doi.org/10.1016/B978-0-12-374739-6.00210-4
Description
Summary:Palsas and lithalsas are mounds that contain lenses of segregation ice. They are islands of permafrost. These two kinds of mounds are very similar in shape, size, and origin. However, the palsas have a cover of peat which does not exist in lithalsas. The formation of ice in the core of these mounds requires material in which capillary water undergoes slow freezing. The remnants of lithalsas are depressions surrounded by ramparts, which does not exist after the melting of palsas. The processes involved in the formation of segregation ice are described in the beginning of the chapter. © 2013 Elsevier Inc. All rights reserved.

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