Morphology and Sedimentology of Eskers in the Lac de Gras Area, Northwest Territories, Canada

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  • An integrated dataset, including LiDAR, grain-size analysis, GPR, and augered boreholes, was used to perform a morphological and sedimentological analysis on 28 km of eskers in the Lac de Gras area, NWT. Esker segments were classified based on morphology and surficial grain size, and depositional environments were interpreted based on sedimentological data gathered from GPR and boreholes. Peaked ridges of cobbles and boulders (Type 1) were inferred to deposit subglacially, and flat topped ridges of finer sediment (Type 2, 3, 4) were inferred to deposited deltaically. Deltaic deposits are found overlying Type 1 subglacial deposits, and at the down esker extents of Type 1 ridges. Evidence points to a time transgressive depositional model, with maximum extent of subglacial feeding conduits not exceeding 3 km in the study area. These results have potential implications for mineral exploration. Transport distance within eskers may not substantially exceed that of the subglacial till.

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  • Copyright © 2017 the author(s). Theses may be used for non-commercial research, educational, or related academic purposes only. Such uses include personal study, research, scholarship, and teaching. Theses may only be shared by linking to Carleton University Institutional Repository and no part may be used without proper attribution to the author. No part may be used for commercial purposes directly or indirectly via a for-profit platform; no adaptation or derivative works are permitted without consent from the copyright owner.
Date Created
  • 2017


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