Resumen en Inglés:

Zircon is fundamental to geochronology, yet its crystal lattice accumulates radiation damage from α-decay of U and Th, progressively modifying physical properties. Raman spectroscopy provides a non-destructive probe of this damage through peak shifts and linewidth broadening, but mode-specific sensitivity and the role of thermal annealing remain poorly constrained. Here, we correlate effective uranium (eU), accumulated α-dose, and Raman linewidths in zircons from the Brazilian Carajás Province, Peixe Alkaline Suite, and the Fish Canyon Tuff standard using confocal micro-Raman spectroscopy and LA-ICP-MS. Linewidths increase non-linearly with dose and exhibit strong inter-mode correlations, with the external rotation (ER) mode providing the most robust proxy for structural disorder. Variability in linewidth–eU relationships indicates that Raman broadening primarily records time-integrated α-dose. Inter-band comparisons reveal mode-dependent annealing, while high-resolution mapping highlights micrometer-scale heterogeneity. These results demonstrate that robust quantification of radiation damage requires spatially resolved, multi-parameter calibration.