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TitleThickness record of varves from glacial Ojibway Lake recovered in sediment cores from Frederick House Lake, northeastern Ontario
LicencePlease note the adoption of the Open Government Licence - Canada supersedes any previous licences.
AuthorBrooks, G RORCID logo
SourceGeological Survey of Canada, Open File 8851, 2022, 18 pages, Open Access logo Open Access
PublisherNatural Resources Canada
Documentopen file
Mediaon-line; digital
RelatedThis publication is related to Insights into the Connaught sequence of the Timiskaming varve series from Frederick House Lake, northeastern Ontario
File formatreadme
File formatpdf; rtf; csv; xlsx (Microsoft® Excel®)
NTS42A/10; 42A/11; 42A/14; 42A/15
AreaFrederick House Lake
Lat/Long WENS -81.1667 -80.5000 49.0000 48.5000
Subjectssurficial geology/geomorphology; stratigraphy; geophysics; Science and Technology; Nature and Environment; lake sediments; varves; clastics; landslide deposits; lake sediment cores; lake sediment thickness; photography; geophysical surveys; acoustic surveys; systematic stratigraphy; stratigraphic correlations; disconformities; glacial history; glaciation; glacial lakes; depositional history; landslides; mass wasting; laminations; Glacial Lake Ojibway; Timiskaming Series; Connaught Sequence; Frederick House Lake Series; Reid Series; Laurentide Ice Sheet; Cochrane Advance; lacustrine sediments; colluvial and mass-wasting deposits; glaciolacustrine sediments; Phanerozoic; Cenozoic; Quaternary
Illustrationslocation maps; tables; geophysical profiles; lithologic logs; geophysical images; correlation sections; time series; photographs
ProgramPublic Safety Geoscience Nuclear Waste Management Organization
Released2022 01 06
AbstractThe thicknesses of 384 rhythmic couplets were measured along a composite sequence of glacial Lake Ojibway glaciolacustrine deposits recovered in two sediment cores from Frederick House Lake, Ontario. The visual comparison of distinctive couplets in the CT-scan radiographs of the Frederick House core samples to photographs of core samples from Reid Lake show a match of ±1 varve number from v1656-v1902, and ±5 varve numbers between v1903-v2010, relative to the regional numbering of the Timiskaming varve series. There are two interpretations for the post-v2010 couplets that fall within the Connaught varve sequence of the regional series. In the first, the interpreted numbering spans from v2066-v2115, which produces a gap of 55 missing varves equivalent to v2011-v2065, and corresponds to the original interpretation of the Connaught varve numbering. The second spans v2011a-v2060a, and represents alternative (a) numbering for the same varves. Varve thickness data are listed in spreadsheet files (.xlsx and .csv formats), and CT-Scan radiograph images of core samples are laid out on a mosaic poster showing the interpreted varve numbering and between-core sample correlations of the varve couplets.
Summary(Plain Language Summary, not published)
Clastic varves are sediments that accumulate in glacial lakes. Similar to tree rings, they can be used to date deposits or features in glacial lakes. This paper is identifies and proposes a correction to the numbering of the youngest varves in Timiskaming varves series. These varve accumulated in glacial Lake Ojibway, northeastern Ontario-western Quebec, as the Laurentide Ice Sheet was receding in the region.

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