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TitleMacrofossil, pollen, and geochemical records of peatlands in the Knosheo Lake and Detour Lake areas, northern Ontario
LicencePlease note the adoption of the Open Government Licence - Canada supersedes any previous licences.
AuthorKettles, I M; Garneau, M; Jetté, H
SourceGeological Survey of Canada, Bulletin 545, 2000, 28 pages (1 sheet), 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
Mediapaper; on-line; digital
File formatpdf
NTS32E/13NW; 42H/16NE; 42P/12SW
AreaKnosheo Lake; Detour Lake
Lat/Long WENS-80.2500 -79.7500 50.0000 49.8750
Lat/Long WENS-81.7500 -81.7500 51.6250 51.5000
Subjectsgeochemistry; paleontology; macrofossils; pollen; geochemical analyses; peatlands; vegetation; pollen analyses; Holocene; trace element geochemistry; cores; radiocarbon dates; Quaternary
Illustrationssketch maps; photographs; analyses
Released2000 04 01; 2014 08 22
AbstractThe macrofossil and pollen records from two cores in the Detour Lake and Kinosheo Lake peatlands in northeastern Ontario cover more than 7000 years and 4000 years of vegetation history, respectively, and record a succession of peatland environments. The Detour Lake pollen record includes the vegetation successions associated with two major climatic shifts, the Mid-Holocene warm period and Late Holocene cooling trend. From 4000 BP, the vegetation successions derived from pollen analysis correlate well with respect to the evolution of the peatland and surrounding upland vegetation. Similar patterns of change were also noted in the pollen and macrofossil stratigraphies from other parts of northern Ontario. Patterns of trace element distribution reflect major changes in the peatlands. The most notable is the decrease in most trace elements as the peatland evolved from minerotrophic to ombrotrophic conditions. Levels of many elements are enriched in the near-surface peat horizons. Based on the data from this study, it is not possible to identify which part of the surface enrichment reflects airborne anthropogenic pollutants, inputs from naturally occurring atmospheric sources, or the relocation of inorganic constituents by physical, chemical, or biological processes.

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