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TitleMerged and harmonized data for the atlas of lake sediment geochemistry of western Labrador and northeastern Quebec
LicencePlease note the adoption of the Open Government Licence - Canada supersedes any previous licences.
AuthorMcCurdy, M WORCID logo; Amor, S D; Garrett, R G
SourceGeological Survey of Canada, Open File 8817, 2021, 6 pages, Open Access logo Open Access
PublisherNatural Resources Canada
Documentopen file
Mediaon-line; digital
RelatedNRCan photo(s) in this publication
RelatedThis publication is related to Creation of an atlas of lake-sediment geochemistry of western Labrador and northeastern Quebec
File formatreadme
File formatpdf; rtf; docx (Microsoft® Word®); xlsx (Microsoft® Excel®)
ProvinceNewfoundland and Labrador; Quebec
NTS13L; 13M; 14C; 14D; 14E; 14F; 14L/01; 14L/02; 14L/03; 14L/04; 14L/05; 14L/06; 14L/07; 14L/08; 23I; 23J; 23K; 23N; 23O; 23P; 24A; 24B; 24C; 24E; 24F; 24G; 24H; 24I; 24J; 24K; 24L; 24P/02; 24P/03; 24P/04; 24P/05; 24P/06; 24P/07; 24P/10; 24P/11; 24P/12; 24P/13; 24P/14; 24P/15; 25A/02; 25A/03
Lat/Long WENS -72.0000 -60.0000 61.0000 54.0000
Subjectssurficial geology/geomorphology; geochemistry; Science and Technology; Nature and Environment; lake sediment geochemistry; geochemical analyses; statistical analyses; geochemical dispersion; mass spectrometer analysis; clasts; organic materials; Paleoproterozoic; New Quebec Orogen; Labrador Trough; lacustrine sediments; Phanerozoic; Cenozoic; Quaternary; Precambrian; Proterozoic
Illustrationstables; location maps; photographs
ProgramGEM-GeoNorth: Geo-mapping for Energy and Minerals GEM Program Coordination
Released2021 09 21
AbstractGeochemical data for 21 678 lake-sediment samples, analysed for 53 elements by ICP-MS after aqua-regia digestion, were compiled to create an atlas of surficial geochemistry. Statistical tests and plots of the combined data, after the application of levelling functions, where necessary, show that the differences that previously existed between analyses employing digestions of varying strengths can be largely compensated for. Using this combined dataset, integrated geochemical maps for an area of almost 300 000 km2 were published, revealing many large-scale geochemical features. These features are related to the rocks of the Paleoproterozoic 'Labrador Trough', part of the New Quebec Orogen, or to the relative amounts of organic and inorganic clastic material in the lake sediment. The release of the merged data sets is expected to provide assistance with geological mapping of this large area, as well as providing a stimulus for mineral exploration. By providing data in several formats, including the original raw data as well as levelled and/or smoothed data for some elements, we hope to encourage the use of these data and the development of new methods for exploratory data analysis and visualization.
Summary(Plain Language Summary, not published)
Samples of lake sediment covering an area of almost 300,000 km2 in northeastern Quebec (26,727 sites) and adjacent Labrador (5,511 sites) were collected by the provincial and federal governments between 1978 and 1997. We applied statistical procedures to reduce certain discontinuities at the provincial border, caused by using analytical methods that differed between the two provinces/regions, to publish a digital atlas of geochemical maps for 53 elements in lake sediments. A database has been prepared that includes the original data, and the modified data that we used to produce the atlas. We hope to encourage the use of these data to develop new methods for mineral exploration.

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