Abstract

Multi-element ICP-MS analyses from northeastern Québec and west-central Labrador have been combined to create a geochemical database of 21,678 lake-sediment samples, analyzed by ICP-MS after aqua-regia digestion, for 53 elements. Statistical tests, and plots of the combined data (in some cases, after the application of levelling functions) show that the disharmony that existed previously, between analyses that employed digestions of differing strengths, can be largely alleviated. This allows the creation of integrated geochemical maps of an area of almost 300,000 km2.

Many of the large-scale geochemical features revealed by the data are related to the rocks of the Paleoproterozoic ‘Labrador Trough’, within the region termed the New Quebec Orogen. However, those that are defined by an association of Rb, K, Ti, Li, Cs, Mg, Ga, Sn and Th, correlated negatively with LOI, Hg, Se, S, Ag, Cd, Ca and Sr may be related to the relative amounts of organic and inorganic clastic material in the lake sediment, rather than bedrock geology.

It is hoped that the merged data will provide assistance to the geological mapping of this large area, as well as providing a stimulus to mineral exploration.

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