Exterior planar microstructures and interior structures of zircons, sample 257 543, Maniitsoq structure. a–b: Two sets of CPs and PFs. Offsets and cataclasis along PFs are clearly visible in the surface topography of the SE images. c–d: Three sets of CPs with spacing ≥1 μm and more widely spaced PFs locally offsetting the CPs. Corrosion visible at PF intersections. e–i: Strongly fractured grain fragment with distinct longitudinal PFs accompanied by fractures and another a set of poorly developed, oblique CPs and PFs; the interior surface (f) contains many coarse, irregular pore trails including a few matching the exterior PFs. The EBSD misorientation image and pole plot (h–i) reveal crystal-plastic deformation with irregular panels of gradational lattice distortion in two directions and healed fractures parallel to exterior PFs. Broad peaks in the misorientation profile (H) are interpreted as micrograins re-orientated by cataclasis along former PFs. j–m: Grain with one distinct set of PFs and interstitial, partially annealed CPs along {100} and another set of faint CPs and PFs. Some crystal faces are almost completely smoothed, with annealing of planar microstructures. The interior structure (k–m) is almost completely homogenised, with almost fully annealed growth zonation, absence of EBSD misorientation and no axial spread in pole plots (m).