Plate 1. Selected key textural relationships in the high-grade schist. 1. D2 fold in a biotite-rich high-grade schist. Sillimanite and biotite define S2 parallel to the axial surface of the fold. Note on the lower left corner the early plagioclase porphyr

Plate 1. Selected key textural relationships in the high-grade schist. 4. Large plagioclase porphyroblasts (P) with two stages of growth. These grains have graphite-rich cores (plagioclase I) indicating that they grew statically over an early foliation (S₁), and were subsequently rotated during D₂. Plagioclase rims usually contain inclusions of biotite and sillimanite parallel to the external S₂ foliation, indicating a late, post-D₂ growth of plagioclase (plagioclase II). Oriented aggregates of fibrolitic sillimanite (S) and biotite (B) define the S₂ in press. foliation. Sample 161-976E-23R-2, 118-123 cm. Plane-polarized light. Scale bar is 200 µm.