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The crystalline bedrock is mainly composed of gneisses, granites and migmatites with the presence of gabbro and crystalline limestones. These rock formations are massive, slightly fractured and have a terrain of locally rugged hills. The igneous/metamorphic rocks outcrop on an important part of the region, mainly in the northeast/north. Those outcrops create unconfined water table conditions. The aquifer is vulnerable to contamination from the surface. Water percolates and flows through fractures and voids in the rocks. Considering the weak fracturing, water flows slowly causing a low aquifer potential. Groundwater type is calcic bicarbonate and it shows low mineralization. |
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Physiography
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| Hydrogeological region | Canadian Shield |
| Hydrogeological context | |
| Relief | The igneous/metamorphic rocks covered by a continuous till unit have large scope in the area. They are mainly found in the north-east/north. The ground elevation varies according to their location. The altitudes are higher to the north, where the terrain is locally rugged. They gradually decrease towards the south. |
| Area | 1278.00 km2 |
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Lithology
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| Description | The crystalline bedrock of the geological Grenville Province dated Precambrian. The rocks are mainly gneisses, granites and migmatites with the presence of gabbro and crystalline limestones. These rock formations are massive, slightly fractured and have a terrain of locally rugged hills. They outcrop over a significant part of the area, covering almost all the northeast and an important part of the north. |
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Aquifer
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| Aquifers | List of aquiferigneous rock aquifer |
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