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 porphyroblasts with dark graphitic inclusions defining the previous foliation S1. Sample 161-976E-23R-2, 118-123 cm. Plane-polarized light. Scale bar is 500 µm. 2. Detail of a D2 fold deforming S1. S1 is defined by garnet-rich and quartz-rich laminae. Garnet I porphyroblasts (G) have a typical skeletal and tabular shape. Sample 161-976E-14R-3, 0-4 cm. Plane-polarized light. Scale bar is 500 µm. 3. Large plagioclase porphyroblasts (P) with straight graphitic inclusion trails, suggesting plagioclase growth between D1 and D2 (plagioclase I). Sheaves of fibrolitic sillimanite (S) and oriented biotite porphyroblasts (B) define the S2 foliation. Sample 161-976B-77R-2, 40-44 cm. Plane-polarized light. Scale bar is 500 µm. 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. 5. Biotite porphyroblasts (B) closely related to harmonious fibrolite (S) defining the S2 foliation. Note the occurrence of some fibrolite crystals with disharmonious textures. Sample 161-976B-77R-2, 40-44 cm. Plane-polarized light. Scale bar is 200 µm. 6. Nontransformed, elongated staurolite porphyroblasts (St) with straight inclusion trails (rutile, ilmenite, and graphite) defining S1. These trails are oblique to the external S2 fabric, defined by oriented biotite, plagioclase, and sillimanite. Sample 161-976B-76R-1, 45-49 cm. Plane-polarized light. Scale bar is 200 µm.

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 porphyroblasts with dark graphitic inclusions defining the previous foliation S₁. Sample 161-976E-23R-2, 118-123 cm. Plane-polarized light. Scale bar is 500 µm. 2. Detail of a D₂ fold deforming S₁. S₁ is defined by garnet-rich and quartz-rich laminae. Garnet I porphyroblasts (G) have a typical skeletal and tabular shape. Sample 161-976E-14R-3, 0-4 cm. Plane-polarized light. Scale bar is 500 µm. 3. Large plagioclase porphyroblasts (P) with straight graphitic inclusion trails, suggesting plagioclase growth between D₁ and D₂ (plagioclase I). Sheaves of fibrolitic sillimanite (S) and oriented biotite porphyroblasts (B) define the S₂ foliation. Sample 161-976B-77R-2, 40-44 cm. Plane-polarized light. Scale bar is 500 µm. 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. 5. Biotite porphyroblasts (B) closely related to harmonious fibrolite (S) defining the S₂ foliation. Note the occurrence of some fibrolite crystals with disharmonious textures. Sample 161-976B-77R-2, 40-44 cm. Plane-polarized light. Scale bar is 200 µm. 6. Nontransformed, elongated staurolite porphyroblasts (St) with straight inclusion trails (rutile, ilmenite, and graphite) defining S₁. These trails are oblique to the external S₂ fabric, defined by oriented biotite, plagioclase, and sillimanite. Sample 161-976B-76R-1, 45-49 cm. Plane-polarized light. Scale bar is 200 µm. Click on image for enlargement.