Imaging the mantle lithosphere of the Precambrian Grenville Province: large-scale electrical resistivity structures

The resistivity structure of the lithospheric mantle beneath the Proterozoic Grenville Province in southern Ontario, Canada is investigated using 84 magnetotelluric (MT) sites divided into four profiles. Depth-based regional geoelectric dimensionality analyses of the MT responses indicate that the mantle lithosphere north of Lake Ontario can be subdivided into upper (45–150 km) and deeper (>200 km...