This report describes results of a U-Pb baddeleyite (ZrO2) istopic age determination on a sample of diabase from the extensive Mistassini dyke swarm, Quebec. The age of this dyke (2515 ±3 Ma) is discussed in the context of other possible correlative swarms occuring on different cratonic blocks that may have been adjacent to the southeastern Superior craton during the late Archean. Coordonnée probable de l'échantillon : NAD 83, zone 18, 600280 m E, 5711210 m N (J. Goutier)
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