Heterogeneous amphibolite facies deformation of a granulite facies layered protolith: Matches Island shear system, Parry Sound domain, Grenville Province, Ontario, Canada

► 100 m scale shear zone system precursor to crustal scale shear zone transposition. ► Granulite facies layered gneiss protolith of shear zone system. ► Heterogenous amphibolite facies retrogression controls geometry of shears. ► Shear system developed by linkage.