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TitleRegional till composition of the Wager Bay area, Nunavut: implications for glacial history and mineral exploration
AuthorMcMartin, I; Campbell, J E; McCurdy, M W
SourceProceedings of the 27th International Applied Geochemistry Symposium (IAGS); 2015 p. 1-6
Alt SeriesEarth Sciences Sector, Contribution Series 20140387
PublisherAssociation of Applied Geochemists
Meeting27th International Applied Geochemistry Symposium (IAGS); Tucson; US; April 20-24, 2015
File formatpdf
NTS46D/12; 46D/13; 46E; 46K/04; 46L; 46M/03; 46M/04; 46M/05; 46M/06; 56A; 56H; 56I; 56P/01; 56P/02; 56P/03; 56P/04; 56P/05; 56P/06; 56P/07; 56P/08; 56J/01; 56J/02; 56J/03; 56J/04; 56J/05; 56J/06; 56J/07; 56J/08
AreaWager Bay; Repulse Bay
Lat/Long WENS -92.0000 -85.5000 67.7500 64.0000
Subjectssurficial geology/geomorphology; geochemistry; glacial deposits; glacial features; glacial landforms; tills; till samples; till analyses; till geochemistry; ice; ice flow; ice movement directions; ice transport directions; drift deposits; glacial history; Cenozoic; Quaternary
Illustrationslocation maps
ProgramRae Province, Tehery-Wager Bay, GEM2: Geo-mapping for Energy and Minerals
The Geological Survey of Canada completed in 2010 to 2012 a combined surficial geological mapping activity (1:100 000 scale) and regional-scale till geochemical survey (10-km spacing) in the north Wager Bay region of mainland Nunavut as part of the Geo-mapping for Energy and Minerals (GEM-1) Program. The objectives of this work were to provide new data, an improved understanding of the glacial history and an evaluation of mineral and park resources in this region. Several significant regional glacial dispersal patterns and geochemical trends are recognized by integrating the GEM-1 analytical results with field work observations, geological mapping and previous work in adjacent areas. For example, a NNE-trending, 35 km-long ultramafic dispersal train characterized by high Ni-Cr-Co-Cu±Mg±V, high chromite and forsterite grain counts and the presence of large ultramafic boulder erratics at its head is found in the western part of the study area. Further east, a distally derived (>25 km) carbonate-rich till underlain by glacially-scoured Archean gneisses occurs south of Repulse Bay; this fine-grained till has a calcareous matrix, contains 1 to 12 % Ca in the <0.063 mm fraction and 11 to 38 % Paleozoic carbonate clasts (8-30 mm), and occurs in association with north-northwestward streamlined landforms and striations which converge north into the Rae Isthmus. Although there is evidence of multiple ice flow directions in the area, the main and older ice-flow trend that converges north (NNE to NNW) towards Committee Bay appears to be the predominant direction of glacial transport. This northern ice-flow phase appears to be responsible for the majority of till production and most prominent streamlined forms in the study area; with the exception of the cold-based highland landscapes near Wager Bay, this suggests warm-based conditions during the last glaciation, with fast flow in Rae Isthmus maintained by the convergence of ice from Melville Peninsula, Keewatin and Foxe Basin. The discovery of distally-derived till in ice stream landforms south of Repulse Bay has significant implications for mineral exploration; specifically for following up indicator mineral dispersal trains that are from more distal sources.
Summary(Plain Language Summary, not published)
This presentation informs on the composition of surface glacial sediments and related field observations collected in 2010, 2011 and 2012 north of Wager Bay in central mainland Nunavut. The paper discusses the provenance of the surficial materials left by the retreat of the last glaciers, as well as some of the key implications for mineral exploration along the northwest coast of Hudson Bay. The findings provide an improved understanding of the glacial history and evaluation of mineral and park resources, and support informed decision making for resource exploration and development, and for land use management. This work was conducted under the Melville Peninsula Project at the Geological Survey of Canada, as part of Natural Resources Canada's Geo-mapping for Energy and Minerals (GEM-1) Program.