Origin, ages, internal structures, and α-ejection correction factors of analyzed crystals. Fth and Ftz, α-ejection correction factors for full crystals with assumed homogeneous and measured zoned distribution of U and Th, respectively, calculated using the equation of Farley et al. (29); age difference, the difference between the ZHe age corrected for α-ejection based on measured U-Th distribution (termed “true” age here) and the ZHe age corrected for α-ejection assuming homogeneity of U and Th (termed “conventional” age here). “+” and “−” mean that the true ZHe age is older or younger, respectively, than the conventional ZHe age. Ma, million years; N/A, not applicable.
| Crystal | Origin | Magmatic/ metamorphic age | Conventional ZHe ages (Ma) | Zircon internal features | Fth | Ftz | Age difference |
| I2-9 | Leucogranite (India) | Emplacement at 2029 ± 65 Ma; overprint at 536 ± 48 Ma (53) | 194.7 ± 20.6 to 314.7 ± 18.9 (Table 2) | Oscillatory zoning with two amorphous, inclusion-rich domains, overgrown by thin high–CL response rim; traversed by several radial fractures | 0.87 | 0.82 | +5% |
| I2-1 | Leucogranite (India) | Emplacement at 2029 ± 65 Ma; overprint at 536 ± 48 Ma (53) | 194.7 ± 20.6 to 314.7 ± 18.9 (Table 2) | Oscillatory zoned; low–CL response core with rounded terminations, overgrown by high–CL response rims containing faint indications of patchy and sector zoning | 0.88 | 0.90 | −2% |
| M14-4 | Variscan batholith from Sardinia (Italy) | Emplacement at 320–290 Ma (52) | 67.1 ± 7.1; 73.7 ± 4.2 (Table 2) | Idiomorphically zoned; rim overgrowing high–CL response core with invaginated boundaries | 0.78 | 0.72 | +6% |
| R-3 | Variscan granite from Bohemian Massif (Poland) | Emplacement at 312.5 ± 0.3 Ma (54) | 99.7 ± 6.7 to 271.2 ± 24.8 (26) | Oscillatory zoning; low–CL response mineral inclusions; convoluted boundaries between some growth zones | N/A | N/A | N/A |