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Ice-Cored Moraines in South-Western Ellesmere Island, N.W.T., Canada*

  • R. A. Souchez (a1)

Abstract

The north-west margin of the main ice cap in south-western Ellesmere Island is fringed by ice-cored moraines. The formation of these moraines seems to be more complex than simple upwarping of the foliation bands at the margin of the ice cap. At one locality, where outer and inner zones can be distinguished on the basis of lithological composition, debris in the outer zone is composed of material from farther back under the ice cap than debris in the inner zone. In another locality, localized ridges cross each other independently of the trend of the main ridge.

The time required to obtain the quantity of debris forming the moraine at the ice surface is estimated to be between 65 and 300 years.

Résumé

Dis moraines perchées sur la glace, d’origine sous-glaciaire, ourlent la bordure nord-ouest de la calotte glaciaire principale dans la partie sud-ouest de l’Ellesmere Island. Leur formation semble être plus complexe que le relèvement de la foliation à la périphérie de la calotte glaciaire. En effet, en un endroit on peut distinguer deux zones dans la moraine; la plus interne est composée de débris dont l’origine se situe plus près du bord de la calotte que ceux qui composent la ride externe. En un autre endroit de cette bordure, on observe des rides locales se recoupant suivant des directions différentes de celle de la ride morainique principale.

Le temps nécessaire à la constitution de la couche de débris formant la moraine à la surface du glacier est estimé entre 05 et 200 ans.

Zusammenfassung

Den Nord-West-Rand des Haupteisschildes im südwestlichen Ellesmere Island säumen Moränen mit Eiskernen. Die Bildung dieser Moränen scheint jedoch auf komplizierteren Vorgängen als einem einfachen Aufbiegen der Bänderung am Rande des Eisschildes zu beruhen. An einer Stelle, wo aufgrund ihrer lithologischen Zusammensetzung eine äussere und eine innere Zone unterschieden werden kann, besteht die äussere Zone aus Schutt, der von entfernteren Teilen des Eisschilduntergrundes stammt als der der inneren Zone. An einer anderen Stelle werden Rücken festgestellt, die einander unabhängig von der Richtung des Hauptrückens kreuzen.

Die Zeil, die erforderlich war, um die Schuttmengen der Moräne auf der Eisoberfläche anzusammeln. wird auf 65 bis 200 Jahre geschätzt.

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Copyright

Footnotes

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page 245 note *

Work done under the auspices of the Geological Survey of Canada.

Footnotes

References

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Baird, P.D. 1952–53 The glaciological studies of the Baffin Island expedition,1950 by Ph.D. Baird Ward, W.H.,Orvig, S.. Journal of Glaciology, Vol. 2, No. 11, p. 223: No. 12, p. 11–21: No. 13, 1953 p. 158 68.
Bishop, B.C. 1957 Shear moraines in the Thule area, northwest Greenland. U.S. Snow, Ice and Permafrost Research Establishment. Research Report 17.
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Hooke, R.L. 1968 Comments on “The formation of shear moraines: an example from south Victoria Land, Antarctica". Journal of Glaciology, Vol. 7, No. 50, p. 35152. [Letter]
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Weeterman, J. 1961 Mechanism for the formation of inner moraines found near the edge of cold ice caps and ice sheets. Journal of Glaciology, Vol. 3, No. 30, p. 96578.

Ice-Cored Moraines in South-Western Ellesmere Island, N.W.T., Canada*

  • R. A. Souchez (a1)

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