Figure 3. Garnet compositions in metapelitic rocks are plotted as a function of almandine (Alm), spessartine (Sps), and pyrope (Pyr) end-members. Projection is from grossular. Light gray arrows indicate core-to-rim variations. Arrow length is proportional to the amount of compositional variation between cores and rims. Broken arrow in (A) shows the rim composition of garnet I grains with an outermost rim similar in composition to garnet II. Mineral abbreviations after Kretz (1983). HGS = high-grade schist.

Figure 3. Garnet compositions in metapelitic rocks are plotted as a function of almandine (Alm), spessartine (Sps), and pyrope (Pyr) end-members. Projection is from grossular. Light gray arrows indicate core-to-rim variations. Arrow length is proportional to the amount of compositional variation between cores and rims. Broken arrow in (A) shows the rim composition of garnet I grains with an outermost rim similar in composition to garnet II. Mineral abbreviations after Kretz (1983). HGS = high-grade schist.