Perennially frozen lakes at glacier/ rock margins, East Antarctica.

• Main Authors: Pickard, J., Adamson, D. A.
• Format: Article in Journal/Newspaper
• Language: English
• Published: 1983
• Subjects: East Antarctica; Antarc*; Antarctica
• Online Access: https://researchers.mq.edu.au/en/publications/331bf4e1-ceb7-43d1-9210-1e3a576ba4df; http://www.scopus.com/inward/record.url?scp=0021027392&partnerID=8YFLogxK

Perenially frozen lakes partially bounded by icesheet or glacier ice occur widely in Antarctica. Lakes form when meltwater at the rock margin becomes deeper than the winter freezing point. Thermo-erosion of glacier ice expands the lake, and as the glacier ice capping the lake ablates, it is replaced from below by refrozen lake water. Diapiric domes occur on smaller lakes, and pressure ridges on large lakes. Debris deposits on nunatak slopes above lakes include lacustrine sediments as well as scree and till. Strandlines of boulders indicate stages in icesheet lowering, while water marks on rock bluffs indicate stages in lowering of the lakes. -from Authors