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Ice-wedge Ice, Mackenzie Delta-Tuktoyaktuk Peninsula Area, N.W.T., Canada

  • W. Alan Gell (a1)

Abstract

Petrologic analysis was performed on ice-wedge ice in order to investigate changes in fabric across wedges in relation to the growth mechanism. Crystal size increased from the centre outward and strongly preferred dimensional orientations developed parallel to the sides of wedges. c-axis orientations changed from a horizontal girdle at the wedge centre to a point maximum normal to the foliation at the boundary. These changes are related to recrystallization and grain growth associated with the horizontal stress field. In massive ice penetrated by an ice wedge, crystal size and complexity of crystal shape decreased toward the wedge, dimensional orientations tended to become parallel to the wedge, and c-axes formed a point maximum normal to the wedge boundary.

Résumé

On a conduit une analyse pétrologique sur la glace des “coins de glace” en vue de déterminer les changements dans les orientations des axes dans les coins en relation avec le mécanisme de la croissance. La tatille des cristaux gradiant du center vers l’extérieur et la dimension paralléle aux côtés du coin est très largement favorisée. Les orientations des axes-c changent depuis une disposition en cristaux horizontale au centre du coin jusqu’à un point maximum normal à la foliation vers les boards. Ces changements sont liés à la recistallisation et à la croissance des grains associés au champ des bords. Ces changements sont lié à la recristallisation et à croissance des grains associés au champ des forces horizontales. Dans une glace massive traversée par un coin de glace, la taille des cristaux et la complexité des formes cristallines diminuent en allant vers le coin, les grandes dimentions des cristaux tendent à devenir paralléles au coins et les axes-c présentent une orientation préférentielle normale à la paroi du coin.

Zusammenfassung

Eis aus Eiskeilen wurde petrologisch untersucht, um Gefügeänderungen innerhalb der Keile in Abhängigkeit vom Wachstumsablauf festzustellen. Die Grösse der Kristalle nahm von innen nach aussen zu; ihre räumliche Orientierung richtete sich bevorzugt parallel zu den Seiten des Keiles. Die Orientierung der c-Achsen ging von cinem horizontalen Gürtel im Keil-Zentrum zu einer Stellung senkrecht zur Bänderung am Rande über. Dieser Wechsel hängt mit der Rekristallisation und dem Konwachustum zusammen, dic mit dem horizontalen Spannungsfeld verbunden sind. In massivem Eis, das einem Eiskeil durchdrungen wird, nahm die Korngrösse und die kompliziertheit der Kristallformen gegan den Keil hin ab, die räumliche Orientierung strebte nach Parallelität mit dem Keil und die c-Achsen errcichten eine Häufung senkrecht zum Keilrand.

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Copyright

References

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Ice-wedge Ice, Mackenzie Delta-Tuktoyaktuk Peninsula Area, N.W.T., Canada

  • W. Alan Gell (a1)

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