Lithospheric architecture at the Rae-Hearne boundary revealed through magnetotelluric and seismic experiments

The western segment of the Churchill Province of Canada, west of Hudson Bay, was divided by Hoffman (1988) into the Archean Rae and Hearne domains separated by the Snowbird Tectonic Zone (STZ) (Fig. 1), defined on the basis of potential field data. The Hearne domain has been further subdivided into the northern Hearne and southern Hearne subdomains (Davis et al., this volume). There is little dispute about the exposed southernmost NE-SW segment of the STZ, from south of Baker Lake through the Athabasca basin and cotinuing beneath the sedimentary cover of the Western Canada Sedimentary Basin. However, its projection east of Baker Lake along Chesterfield Inlet is highly speculative and debatable.