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Full-Text Articles in Earth Sciences
A Regional Chemical Characterization And Analysis Of Groundwater In Eastern Ontario, Laura M. Colgrove
A Regional Chemical Characterization And Analysis Of Groundwater In Eastern Ontario, Laura M. Colgrove
Electronic Thesis and Dissertation Repository
This study utilizes 234 samples to provide a regional characterization and analysis of groundwater chemistry in eastern Ontario, Canada, where elevated TDS, Na and halogens occur in shallow groundwater. Water-types, PCA and mapping are used to investigate the processes and features controlling the chemistry. The chemical patterns are associated with glaciomarine deposits (extent, thickness) and bedrock topography, which modulate residence time and flow-path of groundwater. These determine the relative effects of recharge, ion exchange, salinization and organic breakdown on groundwater chemistry. Anomalous chemistry east of Ottawa (brackish-to-saline TDS; elevated water δ18O; elevated Na, Cl, I, CH4, …
Isotopic Fingerprinting Of Shallow And Deep Groundwaters In Southwestern Ontario And Its Applications To Abandoned Well Remediation, Mitchell E. Skuce
Isotopic Fingerprinting Of Shallow And Deep Groundwaters In Southwestern Ontario And Its Applications To Abandoned Well Remediation, Mitchell E. Skuce
Electronic Thesis and Dissertation Repository
Abandoned hydrocarbon wells in southwestern Ontario can act as conduits for Sulphur water, brines, and hydrocarbons from deep Paleozoic bedrock aquifers. Such leakage may pose a threat to shallow groundwater and the environment. Cost-effective plugging of these wells requires knowledge of the sources of the leaking fluids. This study characterizes the isotopic compositions (δ18OH2O, δ2HH2O, δ34SSO4, δ18OSO4, δ13CDIC, 87Sr/86Sr) of groundwaters in the region, which are distinct in different bedrock formations. A Bayesian mixing model was applied to these data to develop a tool for identifying the source(s) of leaking fluids. The geochemical data also improve our understanding of groundwater …