This reconnaissance study compares the ammonium content of some granites from the southern Yukon with granites in other regions. Analyses show a slight variation in ammonium content between individual intrusions, but there appears to be no correlation between NH4 content and granite type.
All analysed specimens showed low ammonium contents when compared with granites from other regions. This ammonium deficiency in the original magma is taken as evidence that magma was uncontaminated by sedimentary wall rocks at the level of emplacement.