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Recent “Annual” Moraine Ridges at Austre Okstindbreen, Okstindan, North Norway *

  • Peter Worsley

Abstract

A series of minor moraine ridges lying on a lodgement till surface in front of the glacier Austre Okstindbreen are described. The available chronological control suggests that from 1957 through to 1970 a new ridge was formed each winter and that this pattern of annual production is probably also applicable to the period back to circa 1950. During the winter months of 1970/71 and 1971/72 the glacier advanced and deformed the ice cover of a marginal lake which now isolates the till areas from the ice margin. It is concluded that the ridges are true “annual” moraines formed primarily by ice push although the operation of a squeeze process during their genesis is not rejected.

On décrit une série de petites rides morainiques reposant sur une surface de till de plâtrage à l’aval du glacier Austre Okstindbreen. Les chronologies disponibles suggèrent que de 1957 à 1970 une nouvelle ride fut formée chaque hiver et que ce processus de production annuelle s’applique également à une période remontant à 1950 environ. Pendant les mois d’hiver 1970/71 et 1971/72, le glacier avança et déforma la couverture de glace d’un lac bordier qui isole maintenant la surface de till du bord de la glace. On en conclut que les rides sont de véritables moraines “annuelles” formées principalement par la simple poussée de la glace, bien que l’action d’un processus de compression pendant leur formation ne soit pas rejeté.

Zusammenfassung

Eine Reihe kleiner Moränenrücken, die auf der Oberfläche einer Grundmoräne vor dem Austre-Okstindbreen liegen, wird beschrieben. Die verfügbare chronologische Kontrolle lässt vermuten, dass von 1952 bis 1970 jeden Winter ein neuer Rücken entstand und dass dieser Vorgang sich wahrscheinlich schon seit 1950 wiederholt hat. Während der Wintermonate 1970/71 und 1971/72 hat sich der Gletscher vorgeschoben und dabei die Eisdecke eines Randsees verformt, der nun das Gebiet der Grundmoräne vom Eisrand trennt. Es wird gefolgert, dass die Rücken wahre “jährliche” Moränen sind, die hauptsächlich durch Eisschub entstanden sind, obwohl Druckvorgänge während ihrer Entstehung nicht ausgeschlossen sind.

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Copyright

Footnotes

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*

Okstindan Research Project Report No. 4.

Footnotes

References

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Elson, J. A 1968. Washboard moraines and other minor moraine types. (In Fairbridge, R. W, ed. The encyclopedia of geomorphology. New York, Reinhold Book Corporation, p. 121319.)
Fægri, K [1950.] On the variations of western Norwegian glaciers during the last 200 years. Union Géodésique et Géophysique Internationale. Association Internationale d’Hydrologie Scientifique. Assemblée générale d’Oslo, 19–28 août 1948. Procès-verbaux des séances. Tom. 2, p. 293303.
Hoel, A, and Werenskiold, W 1962. Glaciers and snowfields in Norway. Norsk Polarinstitutt. Skrifter. Nr. 114.

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