ABSTRACT: An integrated approach to paleo ice stream determination.

CGRG Bibliography of Canadian Geomorphology
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Abstract

Ice stream research has gained momentum in the last decade due to the increased need to understand ice sheet dynamics and instability, and by extension the role it has in climate change and glacial landscape evolution. Although there has been a lot of work done recently with respect to ice sheet dynamics, much remains to be done for understanding the role of terrestrial paleo ice streams. We have recently proposed a model that shows at least two large systems of ice streams and tributaries with contrasting characteristics in southern Saskatchewan (Canada). The focus of this current research is to further test the sediment-landform assemblages that are central to the proposed model. This is done through spatial analysis of sediment and landform characteristics (e.g. compositional data, till fabric, types of landforms). Provenance is determined by using radiometric data, Ar/Ar dating of hornblende grains and geochemical (carbonate) dispersals. Preliminary results show spatially consistent patterns that fit within the structure of the proposed ice stream model. More data is currently being added to the analysis including additional Ar ages, till fabric data, and striations on lodged boulders. All of the data is geo-referenced in GIS to examine the potential sediment-landform relationships. Further characterization of the paleo-ice stream systems in the Prairies is critical to improve our understanding of how large past ice sheets, like the Laurentide Ice Sheet, evolved and eventually collapsed. This wo

Bibliography of Canadian Geomorphology