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TitleRegional geochemical survey of surficial sediment in southern Ontario: a geochemical baseline for environmental and human health assessment
DownloadDownload (whole publication)
LicencePlease note the adoption of the Open Government Licence - Canada supersedes any previous licences.
AuthorSharpe, D RORCID logo; Kjarsgaard, B AORCID logo; Klassen, R A; Knight, R AORCID logo; Logan, CORCID logo; Russell, H A JORCID logo; Stepner, D A J
SourceSouthern Ontario groundwater project 2014-2019: summary report; by Russell, H A JORCID logo (ed.); Kjarsgaard, B AORCID logo (ed.); Geological Survey of Canada, Open File 8536, 2020 p. 83-93, Open Access logo Open Access
PublisherNatural Resources Canada
Documentopen file
Mediaon-line; digital
RelatedThis publication is contained in Southern Ontario groundwater project 2014-2019: summary report
File formatpdf
NTS30; 31B; 31C; 31D; 31E; 31F; 31G; 31L; 31M; 40; 41A; 41G; 41H; 41I; 41J
Lat/Long WENS -83.5000 -74.2500 47.0000 41.5000
Subjectssurficial geology/geomorphology; soils science; geochemistry; environmental geology; regional geology; mineralogy; Nature and Environment; Health and Safety; Science and Technology; sediments; soils; sediment geochemistry; soil geochemistry; geochemical surveys; glacial deposits; tills; organic deposits; sands; muds; silts; bedrock geology; lithology; sedimentary rocks; carbonates; limestones; dolostones; shales; evaporites; gypsum; salt; sandstones; metamorphic rocks; marbles; igneous rocks; neutron activation analyses; spectrometric analyses; x-ray fluorescence analyses; trace element geochemistry; provenance; weathering; modelling; calcium oxide; strontium geochemistry; magnesium oxide; lead geochemistry; St. Lawrence Lowlands; Canadian Shield; environmental baseline studies; Health; Health protection; Methodology; glaciofluvial sediments; Environmental hazards; Health hazards; Environmental impact assessment; Phanerozoic; Cenozoic; Quaternary; Paleozoic; Devonian; Silurian; Ordovician; Cambrian; Precambrian
Illustrationsgeoscientific sketch maps; plots
ProgramGroundwater Geoscience Aquifer Assessment & support to mapping
ProgramOak Ridges Moraine NATMAP Project
Released2020 05 28
AbstractLow-density sampling and analysis of soil A- and BC-horizons and glacial till, establish a baseline to characterize geochemical background variation in glacial sediments across southern Ontario. Interpretation of these data reveal that regional-scale geochemical variation of earth materials is largely derived from bedrock, with the impact of weathering and soil formation being less significant. For example, geochemical provenance indicators (e.g., Paleozoic carbonate terrane with elevated CaO+MgO, versus Precambrian Shield terrane with elevated SiO2+Al2O3) distinguishes the influence of these source lithologies. Thus, interpretations of geochemical sediment surveys as a basis for geochemical modeling are best approached in terms of geological provenance, process, and weathering. Furthermore, because chemical concentration levels in surficial sediment is also directly related to analytical protocol, knowledge of both mineralogy and strength of chemical digestion is required to understand geochemical processes. This approach, of assessing all chemical variation, contributes greater certainty to risk assessment and decision-making in geochemical models related to environmental and human health protection.
Summary(Plain Language Summary, not published)
Collection of papers on work completed in the past five years as part of the southern Ontario Groundwater Project. This edited volume is a collection of currently unreported work.

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