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TitleStudy of the postglacial marine limit between Wager Bay and Chesterfield Inlet, western Hudson Bay, Nunavut
AuthorRandour, I; McMartin, I; Roy, M
SourceCanada-Nunavut Geoscience Office Summary of Activities; Canada-Nunavut Geoscience Office, Summary of Activities (2016), 2016 p. 51-60
Alt SeriesEarth Sciences Sector, Contribution Series 20160215
PublisherCanada-Nunavut Geoscience Office
File formatpdf
NTS56A; 56B; 46E; 46D; 56C; 56H
AreaWager Bay; Chesterfield Inlet
Lat/Long WENS -94.0000 -86.0000 66.0000 65.0000
Subjectsmarine deposits; trimlines; boulders; terraces; deltas; till ridges; radiocarbon dating; cosmogenic nuclide exposure dating
Illustrationslocation maps; digital elevation models; photographs; satellite images
ProgramRae Province, Tehery-Wager Bay, GEM2: Geo-mapping for Energy and Minerals
AbstractThis paper presents preliminary results of a thematic study on the post-glacial marine invasion between Wager Bay and Chesterfield Inlet, mainland Nunavut (NTS 46D-West, 46E-South, 56A, 56B, 56C-East, 56H-South). The study is part of the surficial geology component of the Tehery-Wager geoscience mapping activity for the GEM-2 Rae project area conducted by the Geological Survey of Canada and the Canada-Nunavut Geoscience Office. The results presented here are compiled from field observations collected in 2015 and 2016.
The geomorphic features used to delineate the post-glacial marine limit are derived from distinct raised marine deposits and trimline settings, including boulder beaches, marine terraces, glaciomarine deltas, wave-cut notches in till uplands, and wave-washed till surfaces exposing bedrock below. Preliminary mapping and detailed measuring of the maximum marine stand indicates that the limit increases southeastward from 113-123 m halfway along Wager Bay (NTS 56H) to 140 m west of Roes Welcome Sound (NTS 46E and 56A) and stays relatively constant at 139-152 m inland towards Tehery Lake (NTS 56B and 56C). Samples were collected for cosmogenic nuclide exposure dating at targeted sites along the marine limit to constrain the timing of marine invasion south of Wager Bay. For this purpose, bedrock was sampled in wave-washed rock surfaces, as marine shells suitable for radiocarbon (14C) dating are relatively rare in the area.
Summary(Plain Language Summary, not published)
The post-glacial sea invaded the coastal lowlands along the northwestern part of Hudson Bay following deglaciation. This report presents a preliminary compilation of the maximum limit of marine inundation determined from the mapping and elevation measurements of raised shorelines as part of the surficial geology component of the GEM 2 Tehery-Wager Activity within the Rae Project area. The report outlines the different types of geomorphic evidence for identifying the marine limit, the field methods to measure the shorelines, and the collection and dating procedures to constrain the timing of the marine invasion. In addition the composition of surface sediments collected above and below the marine limit will be studied. The findings will help characterize the nature of surface sediments potentially affected by marine processes and support informed decision making for resource exploration and development, and for land use management.