There is growing evidence for widespread and voluminous ca. 2.5 Ga magmatism in the Rae craton, but the temporal extent and tectonic setting(s) of this magmatism is unclear. In the Nonacho Lake area of the southwestern Rae craton, we have identified a relatively complete record of ca. 2.54 to 2.43 Ga (meta)granitoid rocks. Based on field relationships, geochronology and geochemistry, these rocks have been separated into two preliminary suites. The first suite is an older group of granitoid rocks that are metaluminous, calc-alkaline and range from 52 to 70 wt.% SiO2. This suite is characterized by moderate HREE depletion (LaN/YbN = 10-40) and consistently chondritic initial εNd values. The second suite comprises weakly peraluminous leucogranite and local leucotonalite, both with SiO2 >70 wt.%. These rocks are characterized by strong HREE depletion (LaN/YbN = 50-260) and initial εNd vales of 0 to -5. Apart from the leucotonalite, both suites are distinct from Archean TTG (tonalite-trondhjemite-granodiorite) in that they are potassic (K2O/Na2O = 0.6-2.4) rather than sodic at SiO2 contents >60 wt.%. One possible explanation for these observations is that the first suite of rocks were generated in a continental arc setting, whereas the second suite of rocks are crustal melts produced during or after orogenic thickening. However, the consistently chondritic Nd isotope composition of the first suite is inconsistent with the mixing and assimilation processes that characterize continental arc magmatism. To test this model, further isotope tracer work is being conducted, along with petrochronology of partially melted metasedimentary and metaigneous rocks that may be coeval with the two granitoid suites.