(a) Position of the monazite crystals (bright spots) in the thin section GDB8. (b) Alignment of monazite clusters parallel to S₂ in migmatitic grey gneiss SP3B. (c–g) Migmatitic grey gneiss SP3B. (c) Back-scattered electron (BSE) images showing the position of the monazite crystals (bright spots) with respect to the garnet porphyroblasts. (d, e) Microprobe X-ray maps and (f, g) BSE images with analytical spots and associated ²⁰⁷Pb/²⁰⁶Pb dates of monazite grain marked in (a). LC: low concentration; HC: high concentration.