GEOSCAN Search Results: Fastlink

GEOSCAN Menu


TitleGeospatial distribution of chemical, bacteriological and gas parameters in southern Ontario groundwater
DownloadDownload (whole publication)
AuthorColgrove, L M; Hamilton, S 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. 6, https://doi.org/10.4095/313561 (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
NTS30; 31B; 31C; 31D; 31E; 31G; 40; 41A; 41G; 41H/03; 41H/04; 41H/05; 41H/06; 41H/12; 41H/13
AreaSouthern Ontario; Great Lakes
Lat/Long WENS -84.0000 -74.0000 46.0000 41.5000
Subjectshydrogeology; environmental geology; regional geology; surficial geology/geomorphology; geochemistry; groundwater; aquifers; groundwater geochemistry; groundwater resources; bacteria; gas; bedrock geology; lithology; glacial deposits; moraines; marine sediments; bedrock topography; karst topography; lithogeochemistry; water quality; geochemical controls; anthropogenic impacts; Phanerozoic; Cenozoic; Quaternary; Paleozoic
Released2019 02 08
AbstractGroundwater Resources Study 17 is a recent publication by the Ontario Geological Survey that delineates wide regions in southern Ontario wherein individual chemical constituents are elevated in groundwater including arsenic, barium, boron, fluoride, nuisance gases (methane, hydrogen sulphide, hypoxic gas), iodide, nitrate, chloride, selenium and uranium. With several exceptions, these regions are explainable as combinations of the natural influence of (1) bedrock lithology, (2) marine sediments, (3) glacial sediment thickness and (4) bedrock topography. Marine influence, particularly in eastern Ontario, is apparent in the distribution of chloride, sodium, iodine, boron, selenium and methane. Drift thickness and/or bedrock topography influences the distribution of chloride, selenium, methane, barium and to a lesser extent, iodine. Bedrock lithogeochemistry controls, or partly controls, the distribution of arsenic, selenium, barium, uranium and chloride.
Shales and carbonate rocks of Devonian age host groundwater that is almost universally elevated in fluoride, making this the only constituent that is spatially related to the age of the host formations. Nitrate is one of several mapped parameters that shows human influence in its distribution; which combines with the influences of coarse grained glacial sedimentary cover and karst in bedrock. The spatial incidence of fecal and total coliform bacteria is also discussed in GRS 17. The occurrence of karst appears to an overwhelming factor in the distribution of coliform bacteria in bedrock. Another anthropogenic influence is chloride from road salting, which has a widespread but intermittent distribution. It can be easily differentiated from natural chloride by comparing molar ratios against those for bromide. The data used to generate the polygons in GRS-17 were derived from the OGS Ambient Groundwater Geochemistry database.
GEOSCAN ID313561