Fig. 3

Microstructural and microchemical analyses of zircon using BSE and CL images, as well as BC, GROD, and EMP maps of trace elements and zirconium in grain A1 (a), grain A3 (b), grain A6 (c), grain A9 (d), and grain A13 (e). Green arrowheads indicate fractures, possibly formed during laser ablation in a separate study or during zircon separation. Blue arrowheads mark the spots analyzed by laser ablation. Red boxes represent the areas of EMP mapping. Yellow arrowheads depict submicron pore trails along low-angle boundaries. Black arrows point to a recrystallization front. Orange arrows denote faded oscillatory zoning, and pink arrows indicate inward-penetrating features of bright-CL domains. Red arrowheads highlight low-angle boundaries. The white box in e signifies the location of Fig. 4a. Y: yttrium, Hf: hafnium, U: uranium, Yb: ytterbium, Th: thorium, Zr: zirconium