Abstract

Structural analysis of the Vizien greenstone belt demonstrates five generations of ductile deformation (D1 to D5), as well as brittle faulting. D1 is indicated by the presence of a pre-D2 foliation. D2 is associated with a major shear zone with northeast-over-southwest(?) dip-slip movement. It is responsible for the main penetrative foliation, axial planar to tight to isoclinal F2 folds. Map-scale open to tight folds are F3 and F4, with north-northwest- and east-trending axial planes, respectively. D5 is associated with dextral transcurrent movement along a north-northwest-trending shear zone. A similar structural history is recognized in the Kogaluc area. The Kogaluc greenstone belt shows structural features similar to gold-mineralized breaks of the southern Superior Province. Map-scale doubly plunging (or proto-sheath) folds of an iron formation unit in the northern Kogaluc belt may be a favourable structural trap.

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