These dikes are only present north of the Link Lake Deformation Zone, therefore they may be subvolcanic feeders to the felsic lava flows to the south.
[1] Renewed tectonism along the Big Dan Shear Zone displaced sediments east of the Ontario Northland Railway.
A similar abundance of felsic dikes are adjacent to Arsenic Lake just west of Highway 11, indicating that similar tectonism also occurred along that structural zone.
Therefore, these north-trending shear zones may have been tectonically active for at least a billion years.
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