| Title | Regional geochemical survey of surficial sediment in southern Ontario: a geochemical baseline for environmental and human health assessment |
| Download | Download (whole publication) |
| |
| Licence | Please note the adoption of the Open Government Licence - Canada
supersedes any previous licences. |
| Author | Sharpe, D R ;
Kjarsgaard, B A; Klassen, R A; Knight, R A; Logan, C; Russell, H A J; Stepner, D A J |
| Source | Southern Ontario groundwater project 2014-2019: summary report; by Russell, H A J (ed.); Kjarsgaard, B A (ed.); Geological Survey of Canada, Open File 8536, 2020 p. 83-93, https://doi.org/10.4095/321094  Open Access |
| Year | 2020 |
| Publisher | Natural Resources Canada |
| Document | open file |
| Lang. | English |
| Media | on-line; digital |
| Related | This publication is contained in Southern Ontario
groundwater project 2014-2019: summary report |
| File format | pdf |
| Province | Ontario |
| NTS | 30; 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 |
| Subjects | surficial 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 |
| Illustrations | geoscientific sketch maps; plots |
| Program | Groundwater Geoscience Aquifer Assessment & support to mapping |
| Program | Oak Ridges Moraine NATMAP Project |
| Released | 2020 05 28 |
| Abstract | Low-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. |
| GEOSCAN ID | 321094 |
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