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TitleQuaternary geology and drift composition, Lake of the Woods region, northwestern Ontario
LicencePlease note the adoption of the Open Government Licence - Canada supersedes any previous licences.
AuthorMinning, G V; Cowan, W R; Sharpe, D RORCID logo; Warman, T A
SourceGeological Survey of Canada, Memoir 436, 1994, 245 pages (6 sheets), Open Access logo Open Access
LinksCanadian Database of Geochemical Surveys, downloadable files
LinksBanque de données de levés géochimiques du Canada, fichiers téléchargeables
PublisherNatural Resources Canada
MapsPublication contains 6 maps
Map Info.surficial geology, lithology, landforms, 1:100,000
Mediapaper; on-line; digital
RelatedThis publication contains the following publications
File formatpdf
NTS52F; 52E/01; 52E/02SE; 52E/02NE; 52E/07; 52E/08; 52E/09; 52E/10; 52E/15; 52E/16
AreaLake of the Woods; Wabigoon Lake; Rowan Lake; Blue Lake; Rat Portage Bay; Gold Rock; Northwest Angle
Lat/Long WENS-95.0000 -92.0000 50.0000 49.0000
Subjectssurficial geology/geomorphology; geophysics; geochemistry; drift deposits; drift prospecting; glaciation; erosion; deglaciation; glaciolacustrine deposits; moraines; glacial history; tills; element distribution; geochemical interpretations; glacial deposits; trace element analyses; analyses; geochemical analyses; seismic profiles; seismic interpretations; seismic surveys; geophysical surveys; side-scan sonar; till geochemistry; Wisconsinian Glacial Stage; glacial stages; Quaternary
Illustrationsanalyses; seismic profiles; photographs; sketch maps
ProgramCanada-Ontario Mineral Development Agreement, 1985-1990
Released1994 12 01; 2013 06 26
AbstractGlacial geological mapping and drift prospecting were conducted in the Lake of the Woods area to aid exploration for gold and base metals. Glacial advances from the northeast and northwest created large areas of erosion and deposits of thin and discontinuous (1-3 m) glacial sediment over granite and greenstone bedrock. Northward retreat of ice was within glacial Lake Agassiz. Thick glaciolacustrine deposits (>50 m), sand and gravel underlying clay, fill topographic basins such as that near Lake Wabigoon. Three long, arcuate, end moraines (Lac Seul, Hartman, and Eagle-Finlayson) contain stratified drift deposited rapidly on subaqueous fans in Lake Agassiz. Rhythmic sediments (varves) provide a 1000 year chronology of basin history and ice wastage. A modified history of events in glacial Lake Agassiz results. Subaqueous and retreat origins for the major moraines indicate the continuous presence of high lake stages in the area. Red varves found north of Hartman Moraine suggests an age of ~10 440 BP rather than 10 000 BP. Low water outlets were apparently not present in the area north of Fort Frances until the Nipigon Lake phase ~ 9500 years ago. Drift sampling was at reconnaissance levels, 219 samples over the 25 500 square kilometre study area. Drift composition indicates that glacial dispersal is minor and composition closely reflects underlying bedrock. Geochemical anomalies thus reflect element distribution in major rock types. Data points are widely spaced and as a result major geochemical trends in tills are not necessarily detected. Summary anomaly maps show the distribution of gold and related elements and base metals. The geochemical maps indicate that more closely spaced sampling might yield results in places, for example near Vermilion Bay or Manitou Lakes. Conventional bedrock mapping and prospecting combined with till geochemistry is recommended in most areas where drift cover is thin. Heavy mineral work on glaciofluvial sediments may also yield further results because these sediments are common and glacial dispersal is low. Basin analysis in thick drift areas provides data on key environmental issues, water supply, waste disposal, and aggregate resources.

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