Mid-crustal deformation at the southern flank of the Sudbury Basin, central Ontario, Canada

A field-based structural analysis was made in the southern footwall of the Sudbury Basin to facilitate a reassessment of the igneous emplacement mechanism of the 1.85 Ga Sudbury norite (i.e., synfold intrusion, impact-melt ponding). More specifically, we wanted to discern whether attitude and curvature of the norite shell were primary or produced mainly by noncylindrical folding. The southern footwall of the Sudbury Basin is composed of …