Nitrogen, argon and helium isotopic compositions were measured by vacuum crushing in pyroxenes and am-phiboles from mafic rocks belonging to the Monteregian Hills (Québec, Canada). For comparison, lead isoto-pic compositions were measured in plagioclase in the same samples. The goal of this study was to constrain the mantle sources of this igneous province, resolving a controversial issue that has persisted for more than 30 years. The measured He and Ar show solubility-controlled elemental fractionation while N is affected by kinetic isotopic fractionation during melt degassing. In contrast, the 40 Ar/ 36 Ar ratio seems not to be affected by kinetic fractionation, but likely reflects mantle sources. The 40 Ar/ 36 Ar and 208 Pb/ 206 Pb ratios are meaning-fully correlated, suggesting the mixing between a plume source showing high 208 Pb/ 206 Pb (≤2.06) and low 40 Ar/ 36 Ar ratios (~1200) and a recycled source such as HIMU showing low 208 Pb/ 206 Pb (≤1.95) and near-atmospheric 40 Ar/ 36 Ar ratios (~ 300). The N 2 / 36 Ar and 206 Pb/ 204 Pb ratios are inversely correlated. Al-though the N 2 / 36 Ar ratios are diluted by an atmospheric-like component, this relationship can be interpreted as the mixing between a recycled component (HIMU) and a mantle source that ambiguously could be either a plume source or the depleted mantle. The samples showing less radiogenic 206 Pb/ 204 Pb ratios show δ 15 N values of − 7.6 to −7.4‰, which points to a MORB-type mantle source (δ 15 N=− 5± 2‰) rather than a plume source (δ 15 N =+3‰). Thus, there is contrasting evidence arguing for either a plume or a depleted mantle component. This ambiguity could be resolved by assuming that the plume source provided heat to melt a sub-continental mantle source. Thus, part of the volatile budget might be issued from this distinct mantle source. This study demonstrates the great potential of coupling radiogenic isotopes together with Ar and N isotopes. Nitrogen and argon are efficiently recycled in the mantle and thus can be helpful in tracing the crustal sources that affect the Sr–Nd–Pb isotopic systems in oceanic and continental volcanism.