ABSTRACT: Investigation of large paleo-ice stream systems in the Canadian Prairies.

CGRG Bibliography of Canadian Geomorphology
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Abstract

Although significant progress have been made recently in understanding the role of ice streams in ice sheet dynamics, much remains to be done for documenting and understanding paleo-ice stream records. This is especially true for terrestrial paleo-ice streams like those that operated in the southwest Laurentide Ice Sheet. We recently showed evidence for at least two large paleo-ice stream systems in southern Saskatchewan and proposed a model involving major glacial dynamics shifts linked to ice streaming in the Prairies. The focus of this current research is to further characterize provenance and to test sediment-landform assemblages that are central to the proposed reconstruction. This is done through spatial analysis of sediment and landform characteristics (e.g. compositional data, till fabric, landform identification). We also have investigated provenance by using radiometric data and Ar/Ar dating of hornblende grains. All of the data is geo-referenced in GIS to examine the spatial relationships. Preliminary results show spatially consistent patterns that fit within the structure of the proposed ice stream model. For example, striation patterns on shallow boulder pavements show a good spatial relationship with the landform record. By using an innovative approach that combines multiple methods of analysis, we are able to go beyond the geomorphologic evidence to investigate the processes involved in the formation of paleo-ice streams and to study their evolution.

Bibliography of Canadian Geomorphology