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TitleThe Ambient Groundwater Geochemistry Program: northeastern Ontario pilot project
DownloadDownload (whole publication)
AuthorDell, K M
SourceRegional-Scale Groundwater Geoscience in Southern Ontario: An Ontario Geological Survey, Geological Survey of Canada, and Conservation Ontario Geoscientists Open House; by Russell, H A J; Ford, D; Holysh, S; Priebe, E H; Geological Survey of Canada, Open File 8528, 2019 p. 10, https://doi.org/10.4095/313579 (Open Access)
Year2019
Alt SeriesOntario Geological Survey, Open File Report 6349
PublisherNatural Resources Canada
PublisherGovernment of Ontario
MeetingRegional-Scale Groundwater Geoscience in Southern Ontario: Open House; Guelph; CA; February 27-28, 2019
Documentopen file
Lang.English
Mediaon-line; digital
RelatedThis publication is contained in Russell, H A J; Ford, D; Holysh, S; Priebe, E H; (2019). Regional-Scale Groundwater Geoscience in Southern Ontario: An Ontario Geological Survey, Geological Survey of Canada, and Conservation Ontario Geoscientists Open House, Geological Survey of Canada, Open File 8528
File formatpdf
ProvinceOntario
NTS31M; 40O; 40P; 41A; 41B; 41G; 41H; 41I; 41J; 41K
AreaSudbury; Lake Huron; Manitoulin Island; North Bay
Lat/Long WENS -85.0000 -79.0000 47.0000 43.0000
Subjectshydrogeology; geochemistry; regional geology; surficial geology/geomorphology; environmental geology; groundwater; groundwater resources; groundwater flow; groundwater geochemistry; aquifers; groundwater pollution; pollutants; host rocks; bedrock geology; lithology; sediments; clays; overburden thickness; radioactivity; radionuclides; radon; isotopic studies; hydrogen isotopes; oxygen isotopes; potassium; water wells; well samples; water quality; uranium geochemistry; metals; bacteria; nitrogen; tritium; cobalt geochemistry; arsenic geochemistry; lead geochemistry; copper geochemistry; calcium geochemistry; potassium geochemistry; chlorine geochemistry; bromine geochemistry; lithium geochemistry; fluorine geochemistry; source areas; brine; Canadian Shield; Southern Province; Huronian Supergroup; Sudbury Basin; Grenville Province; contaminants; beta particles; anthropogenic sources; Precambrian
Released2019 02 08
AbstractA northern Ontario component of the Ambient Groundwater Geochemistry Program (AGGP) was initiated to determine if the methods employed in this project in southern Ontario could be successful in delineating the effect of Precambrian host rock lithology on groundwater chemistry. This third season of the AGGP in northern Ontario was completed in 2018 in the North Bay area and follows two others in 2016 in Sudbury and 2017 along the north shore of Lake Huron and Manitoulin Island. Together, they provide a broad band of samples across north central Ontario at a relatively uniform density. In total, 105 overburden and 337 bedrock wells were sampled and analyzed for metals, anions, bacteria, nitrogen parameters, tritium, ?2H and ?18O, and radionuclides. With the 2018 project in North Bay, a sufficient sample density and distribution exists to create a detailed characterization of groundwater trends across northeastern Ontario. This poster illustrates some of the regional trends and groundwater characteristics observed in the northern Ontario AGGP data thus far.
Our preliminary interpretation suggests that groundwater geochemistry is influenced by host lithology, hydrogeological flow conditions, drift thickness and drift composition. The Precambrian geologic province from which the groundwater originates may be a factor controlling certain regional variations in groundwater chemistry that have been observed. Samples collected from Southern Province rocks of the Huronian Supergroup and the Sudbury Basin show relatively high Co, As, Pb and Cu concentrations versus the Grenville Province. However, preliminary interpretation of some parameters also reveals anomalies coincident with surficial geologic features. In the North Bay area, wells completed in bedrock with overlying Pleistocene clay yield groundwater with higher concentrations of TKN and NH4. These may have originated from the overlying clays because of breakdown of proteinaceous organic matter within the clay. Areas with overlying clay units also have higher gross beta concentrations which may be caused by an enrichment of the naturally occurring 40K isotope in the clays.
Ratios of Cl-Br show a subset of samples with a measurable influence from deep brine water and another subset where surface contamination is indicated; either from road salt or septic sources. Groundwater samples indicating brine mixing have higher Li, Ca, F- and Br- concentrations suggesting longer residence times in the aquifer; and this is supported by lower average tritium (half life = 12.3 years) content. Preliminary interpretation of the 2016 and 2017 data indicate that radon in water is controlled by availability of uranium in the host aquifer. Uranium concentrations, on the other had, are controlled by redox conditions and ion complexing and may not have a strong relationship with uranium concentration in the rocks. Future work will seek to further characterize the controls on groundwater chemistry, employing tools such as multivariant analysis and sulphur and strontium isotopes to trace the sources of solutes.
GEOSCAN ID313579