Comment on: “Petrography of Snap Lake kimberlite dyke (Northwest Territories, Canada) and its interaction with country rock granitoids”

Fulop et al. (2018) infer that the Snap Lake kimberlite intrusion (NWT Canada) was emplaced as a single batch of magma and that internal variations are a consequence of alteration and interactions with granitoid host-rocks by deuteric fluids. However, field, petrological, geochemical and theoretical constraints support multiple magma batches, and show that the deuteric alteration hypothesis is implausible. Rather we propose that alteration is primarily the consequence of reactions between the kimberlite, country rock xenoliths and surrounding granite with groundwaters during cooling and serpentinisation at temperatures between 400◦C and ambient.