Monazite within a granite intruding the Kalak Nappe Complex (Norway) provides an informative example of a complex age spectrum in which U-Th-Pb data scatters for ˜300 Ma along the Concordia curve. SIMS analyses yield 207Pb/235U ages (1σ) of 876 ± 18 to 633 ± 15 Ma, and petrographically constrained age groupings suggest dates of 856 ± 16 Ma for oscillatory zoned cores, 761 ± 32 Ma for patchy domains, and 647 ± 21 Ma for rims. A grid of LA-ICPMS spots across a single grain resolve 207Pb/235U ages (1σ) of 884 ± 23 to 564 ± 14 Ma, corroborating the spread in the SIMS dataset and highlighting its spatial relationship to BSE textures. Such Concordia patterns have led to diverse interpretations including prolonged growth or the influence of a variety of radiogenic-Pb mobility processes. In combination with U-Pb analyses, detailed chemical, EBSD, and Raman imaging are used to resolve the primary mechanism for this protracted age spread.