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Thoughts on Ogive Formation

  • Henry W. Posamentier (a1)

Abstract

The formation of ogives is examined from a structural point of view. It is suggested that the dark bands represent large-crystal, bubble-free ice which was transported from near the glacier base up toward the glacier surface by the processes of folding and/or reverse faulting due to compressive flow at the base of an ice fall, while the white bands represent relatively small-crystal, bubble-rich near-surface ice. The variation in compression to account for periodic folding and/or reverse faulting is explained by seasonal variation in flow velocity through an ice fall.

Résumé

Idées sur la formation des ogives. La formation des ogives est examinée d'un point de vue structural. On suggère que les bandes sombres représentent des gros cristaux sans inclusions de bulles d'air, de glace qui a été transportée depuis les régions proches de la base du glacier jusqu'à la surface par le processus du plissement et/ou de failles de renversement dues à l'écoulement compressif à la base d'une chute de séracs, tandis que les bandes claires représentent des cristaux relativement petits riches en bulles de glace de surface. Les variations de compression dont il faut tenir compte pour expliquer la périodicité des plissements et/ou des failles de renversement sont expliquées par des variations saisonnières de la vitesse d'écoulement dans une chute de séracs.

Zusammenfassung

Überlegungen zur Bildung von Ogiven. Die Bildung von Ogiven wird von einem strukturellen Standpunkt aus betrachtet. Es wird angenommen, dass die dunklen Bänder aus grosskörnigem, blasenfreiem Eis bestehen, das aus der Umgebung des Gletscheruntergrundes zur Gletscheroberfläche durch Faltungs- und/oder Rückfaltungsprozesse unter dem Druckfliessen an der Basis eines Eisfalles transportiert wurde, während sich die weissen Bänder aus relativ feinkörnigem, blasenreichem, oberflächennahem Eis zusammensetzen. Die Druckschwankungen die zu periodischen Faltungs- und/oder Rückfaltungsvorgängen führen, werden aus den jahreszeitlichen Schwankungen der Fliessgeschwindigkeit in einem Eisfall erklärt.

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Copyright

References

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Fisher, J. E. 1962. Ogives of the Forbes type on Alpine glaciers and a study of their origins. Journal of Glaciology, Vol. 4, No. 31, p. 5361.
King, C. A. M., and Lewis, W. V. 1961. A tentative theory of ogive formation. Journal of Glaciology, Vol. 3, No. 29, p. 913–39.
Miller, L. R. Unpublished. Englacial structures of the Vaughan Lewis icefall, and related observations on the Juneau Icefield, Alaska, 19671969. [M.Sc. thesis, Michigan State University, 1970.]
Ragan, D. M. 1969. Structures at the base of an ice fall. Journal of Geology, Vol. 77, No. 6, p. 647–67.

Thoughts on Ogive Formation

  • Henry W. Posamentier (a1)

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