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A number of Neoproterozoic (~680-550 Ma) kimberlites and related intrusions have been identified in eastern North America and southwest Greenland (e.g. Tappe et al., 2016). In eastern Canada these intrusions are known to occur in at least three clusters (Figure 1); the ca. 610-550 Ma ultramafic lamphrophyre intrusions from the Torngat Mountains to Aillik Bay in Labrador (e.g. Tappe et al., 2008 and references therein), the ca. 629 Ma Wemindji kimberlite sills near James Bay (Letendre et al., 2003) and the ca. 656-551 Ma Otish kimberlite field in north-central Québec (Moorhead et al., 2003; Birkett et al., 2004; Fitzgerald et al., 2009; Tappe et al., 2016). An intriguing aspect of this magmatism that has been alluded to previously (e.g. Heaman et al., 2004) is that it broadly coincides with the timing of the breakup of the Rodinia supercontinent and the opening of the Iapetus Ocean (ca. 760-550 Ma; Cawood et al., 2001). However, in detail the connection between kimberlite magmatism and the rifting history of northeast Rodinia remains unclear.

Punctuated, long-lived emplacement history of kimberlites from the Renard cluster, Superior Province, Canada indicated by new high precision U-Pb groundmass perovskite dating