Timing of kimberlite, carbonatite, and ultramafic lamprophyre emplacement in the alkaline province located 64°-67° N in southern West Greenland

The youngest alkaline and ultrapotassic magmatism in West Greenland (Mesozoic to Paleogene) extends for more than 300  km along the coast and the ages obtained in this study for two Jurassic carbonatite complexes, the 165 Ma Qaqarssuk complex near Maniitsoq and the 158 Ma Tikiusaaq complex east of Nuuk, indicate that carbonatites are also an integral part of this Jurassic alkaline province. There is a peak in alkaline and ultrapotassic magmatism in West Greenland during the period 165-145 Ma, possibly indicating a period of increased extension during the opening of the North Atlantic Ocean.