Geology and metamorphic evolution of the Indian Head Range, a Grenvillian inlier in west Newfoundland

The Indian Head Range (IHR) forms an inlier in the western foreland of the Appalachian orogen in Newfoundland. The IHR shows two distinct sets of ductile deformation fabric: (1) a relatively high strain group comprising gneissic to migmatitic rocks; and (2) a relatively lower strain group comprising foliated granitoids. Considering the relative ages of the units, it appears that two metamorphic events occurred in the IHR.;The P-T path shows an initial period of cooling from 900 to 800;Assemblages in the pelitic gneiss are subdivided into three groups. Reaction textures suggest the following metamorphic history. In quartz-bearing rocks, an early crd-spl-high Al opx (8.5-9.5 wt% Al...