Les écoulements et le transport glaciaires dans la partie septentrionale du Nunavik (Québec)

• Published in: Canadian Journal of Earth Sciences
• Main Authors: Daigneault, Robert-André, Bouchard, Michel A
• Format: Article in Journal/Newspaper
• Language: English
• Published: Canadian Science Publishing 2004
• Subjects: General Earth and Planetary Sciences; Nunavik; Hudson; Hudson Strait; Payne; Cape Smith; Ivujivik
• Online Access: http://dx.doi.org/10.1139/e04-048; http://www.nrcresearchpress.com/doi/pdf/10.1139/e04-048

In northern Nunavik, orientation of ice-flow features and dispersal patterns of lithologic indicators suggest three major regional ice-flow phases. The oldest ice-flow phase is related to the buildup of an outflow centre, the Ungava centre, over the high plateaux located north of the Povungnituk Hills. During that event, probably of Early Wisconsinan age, ice flows towards the south and southeast carried Cape Smith Belt rock fragments over a maximum distance of 65 km. The second phase is characterized by ice flow mainly towards the north from an outflow ice centre located south of the studied area (Payne centre). The most recent ice-flow phase is related to the presence of the northern extension of the New-Quebec ice divide. From that northwest-trending ice divide extending between Ivujivik and Lake Nantais, ice was flowing outward on the peninsula. The orientation of most of the ice-flow features and dispersal patterns is associated with that last ice flow. North of the Cape Smith Belt, glacial transport was at least 70 km. In Hudson Strait, ice-flow and glacial transport data support the existence of an eastward flowing ice stream.