The deep structure of the Proterozoic Cape Smith fold-belt, which occurs at the boundary between the Superior and Churchill structural provinces of the Canadian Shield, is derived quantitatively from gravity anomalies. Basaltic rocks of the fold-belt are interpreted in part as remnant blocks of oceanic crust tectonically emplaced by obduction on shelf deposits of the ancient Superior margin. They form part of a proposed circum-Superior suture between collided Superior and Churchill cratons. The structure derived from gravity-anomaly data is compared with a conceptual model of continental convergence, collision, and suturing.

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