| Title | Assessing the integrity of aquitards: the Newmarket Till at Ajax |
| Download | Download (whole publication) |
| Author | Rashtchi, R; Al, T; Cornett, J; Gerber, R; Russell, H A J |
| Source | Regional-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; Priebe,
E H; Holysh, S; Geological Survey of Canada, Open File 8363, 2018 p. 36, https://doi.org/10.4095/306570 (Open Access) |
| Year | 2018 |
| Publisher | Natural Resources Canada |
| Meeting | Regional-Scale Groundwater Geoscience in Southern Ontario: Open House; Guelph; CA; February 28 - March 1, 2018 |
| Document | open file |
| Lang. | English |
| Media | on-line; digital |
| Related | This publication is contained in Russell, H A J; Ford, D;
Priebe, E H; Holysh, S; (2018). 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
8363 |
| File format | pdf |
| Province | Ontario |
| NTS | 30M/13; 30M/14; 30M/15; 30M/16; 31C/04; 31D/01; 31D/02; 31D/03; 31D/04 |
| Area | Ajax; Newmarket; Aurora; Whitby; Toronto; Port Hope; Trenton |
| Lat/Long WENS | -80.0000 -77.7500 44.2500 43.7500 |
| Subjects | hydrogeology; surficial geology/geomorphology; geochemistry; groundwater; groundwater resources; groundwater regimes; groundwater flow; glacial deposits; tills; postglacial deposits; fluvial deposits;
erosion; hydraulic conductivity; boreholes; core samples; pore water samples; chlorine; bromine; fluorine; nitrate; isotopic studies; oxygen isotopes; hydrogen isotopes; carbon isotopes; helium isotopes; modelling; Newmarket Till; Lower Sediment; Oak
Ridges Moraine; aquitards; Phanerozoic; Cenozoic; Quaternary |
| Program | Groundwater Geoscience,
Aquifer Assessment & support to mapping |
| Released | 2018 02 16 |
| Abstract | The Newmarket Till is a regional aquitard in southern Ontario that overlies the Illinoian to Middle Wisconsinan Lower Sediment and is overlain by the Oak Ridges Moraine. Geological investigations have
mapped the distribution of the till and it is understood that erosional channels, subsequently infilled with fluvial material, breach the till and may create enhanced hydraulic connection between overlying and underlying aquifers. However, little is
known about the protective capability of the Newmarket Till where it is intact. This knowledge gap is being addressed by investigations of the rates and mechanisms for transport of natural and anthropogenic tracers in the porewater of the till. The
research program was initiated in October 2017 with the coring of a new borehole at Sideline 4 near the intersection of highways 407 and 412, north of Ajax, Ontario. Vertical concentration profiles are generated for natural tracers by subsampling
drill cores and then extracting porewater to measure the chemical (Cl, Br, F, NO3) and isotopic composition (delta-18O, delta-2H, delta-13C, 3H, 3He/4He). By coupling the tracer concentration profiles with a one-dimensional numerical transport model,
we will calculate the rates of diffusive and advective transport across the aquitard. |
| GEOSCAN ID | 306570 |
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