Nd model age mapping of the southeast margin of the Archean foreland in the Grenville province of Ontario

Nd model ages are used to map the southeast margin of Superior-Southern province basement within the Grenville province of Ontario. This boundary, located ∼60 km southeast of the Grenville Front, is tentatively identified as a collisional suture between an Archean foreland to the northwest and a Proterozoic island are of Penokean age to the southeast.