Merged and harmonized data for the atlas of lake sediment geochemistry of western Labrador and northeastern Quebec / M.W. McCurdy, S.D. Amor, and R.G. Garrett. : M183-2/8817E-PDF

"Geochemical 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"--Abstract, page 1.

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