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Kimberlites of the Qilalugaq cluster were first discovered in 2003 by BHP Billiton approximately 10 km NE of the hamlet of Repulse Bay on the Rae Isthmus, southern Melville Peninsula, Nunavut, NE Canada. The Aviat kimberlite cluster was discovered by Stornoway Diamonds in 2002, approximately 60 km WSW of Igloolik on the Melville Peninsula (Fig 1). Subsequent detailed exploration program on these kimberlites reavealed that kimberlites in both of these clusters are diamondiferous. The grade of Aviat kimberlites (80-160 carat per hundred ton) is significantly higher than those of the Qilalugaq cluster (14-40 carat per hundred ton). In this study, we present the first U-Pb perovskite (CaTiO3) geochronology of several kimberlite bodies to determine their emplacement ages along with the tracer isotope data to evaluate the evolution and nature of the mantle sources. We have also carried out new mineralogical and petrograpic characterisation of these kimberlites to comment on their nomenclature and degree of alteration.

Geochronology and mantle source characteristics of kimberlites and related rocks from the Rae craton, Melville Peninsula, Nunavut, Canada