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TitleA varve record of Lake Ojibway glaciolacustrine deposits from Lac Dasserat, northwestern Quebec, Canada
AuthorBrooks, G R
SourceGeological Survey of Canada, Open File 8089, 2016, 15 pages (1 sheet), (Open Access)
PublisherNatural Resources Canada
Mediaon-line; digital
RelatedThis publication is related to the following publications
File formatreadme
File formatpdf; csv; xlsx; rtf; docx
AreaLac Dasserat
Lat/Long WENS -79.4167 -79.3333 48.2500 48.1667
Subjectshydrogeology; surficial geology/geomorphology; lakes; lake sediments; lake sediment geochemistry; lake sediment thickness; lacustrine deposits; lacustrine environments; glaciolacustrine deposits; sediment transport; cores; varves; varved deposits; submarine transport; submarine features; erosion; Glacial Lake Ojibway; Quaternary
Illustrationslocation maps; tables; plots; core logs
ProgramWestern Canada Geohazards Project, Public Safety Geoscience
Released2016 09 12
AbstractCores recovered from six sites within a study area, ~3 km2, at Lac Dasserat, northwestern Quebec, contained varved Lake Ojibway glaciolacustrine deposits. Measurements of the thicknesses of 546 couplets follow a composite sequence of varves through the recovered deposits. The couplets are interpreted to span varve numbers 1039 to 1637 with respect to the regional Timiskaming varve series. There is a gap of 48 varves in the varve record, representing an apparent erosional unconformity under the submarine landslide deposits of event horizon E. There are also two short gaps of unmeasured varves between varves 1266-1267 and 1051-1053. The 'Dasserat varve record' represents about 75% of the varve deposits preserved within the Lac Dasserat basin.
Summary(Plain Language Summary, not published)
Varves are annual layers of sediments that can form in lakes. This Open File reports varve data from Lac Dasserat, northwestern Quebec. This data is useful for dating deposits of interest in Lac Dasserat. It is also useful for correlating varve sequences between different locations in the region.