Geological Survey of Canada, Current Research (Online) no. 2004-C7
Description:... Rocks in the Ferguson Lake map area consist of multiply deformed Archean gneissic metavolcanic and metasedimentary rocks, and asociated tonalitic, granitic, and gabboric rocks, which have been metamorphosed to upper amphibolite facies. Variably deformed Proterozoic rocks include late gabbro, and syenite lutons and associated lamprophyre dykes. Massive sulphide mineralization is hosted along a stratigraphy-parallel hornblendite layer. Three generations of ductile structures are recognized (G1, G2, and G3)), where the development of the gneissic layer occurred prior to G4 structures. the hornblendite records an S1 foliation and it is, along with the massive sulphide mineralization, folded by F2 and F3. Since G1 and G2 events are tentatively correlated with 2.62 Ga thrusting and 2.55 GA folding and metamorphism documendted in the Yathkyed greenstone belt to the south, the hornblendite-hosted mineralization is inferred to be Archean.
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