U–Pb ages have been determined for two diabase intrusions from Kerns and Hudson townships that are part of the Nipissing diabase suite from the Proterozoic Southern Province, Canada. The ages of the Kerns and Triangle Mountain intrusions are 2217.2 ± 4 and 2209.6 ± 3.5 Ma, respectively, based on analysis of primary baddeleyite from both intrusions. Together with a published U–Pb age for the Castle Mine intrusion, these data indicate that the Nipissing sills were emplaced separately over a time span of 2.8–1.6 Ma, given by the maximum and minimum overlap of errors on the U–Pb ages.

You do not currently have access to this article.