Fig. 9. In this photo, taken along highway 105 south of Perrault Falls, Canada, a massive, coarse-grained, mafic, igneous rock can be seen which is increasingly deformed toward the top of the photo. The dark deformed rock abruptly changes into a strongly-foliated, light-pink, felsic rock with narrow streaks of mafic minerals. Does this photo show a contact between a deformed magmatic granite and the mafic igneous rock or is the felsic rock a product of K-replacement of the mafic rock where the deformation has permitted fluids to enter and cause metasomatism? How could you tell? See also: Myers (1978) for pictures of similar deformed rocks.