Planar microstructures in zircons from sample 525 022, Maniitsoq structure. a: Oblique exterior CPs, parallel healed PFs with displacements and irregular fractures. b: Longitudinal exterior CPs and PFs. Indistinct oblique CPs in upper left of image. c: Two sets of exterior CPs, one of them accompanied by PFs. d–i: Grain with exterior {100} CPs and PFs as well as oblique CPs. f: Interior longitudinal pore trails cutting growth zonation. g: Partly annealed interior CPs along minute pore trails. h: EBSD image with many straight, narrow, likewise longitudinal inter-CP lamellae with systematic misorientations of about 0.5–1°. A second set of oblique, less distinct lamellae occurs near the lower tip, parallel to the oblique exterior CPs in e. The lamellar structure is partially annealed in a curved, subvertical zone 15 μm wide between dotted lines (at the red circle in the misorientation profile). j–m: Another grain with exterior {100} CPs and PFs and oblique CPs. n–r: A third grain with predominant exterior {100} CPs and parallel PFs with displacements. Longitudinal interior pore trails cutting growth zonation are present (o). Inter-CP lamellae across the length of the grain also occur (p) but are but much less distinct than in grain P2–11 (d–h). An irregular block in the top right of the grain has a ~ 2° misorientation is superimposed on the lamellar structure.