Abstract
U-Pb ages are reported for three plutons near the Grenville Front. Coarse granite from the Chief Lake complex in the Southern Province has a zircon age of 1464+2/-1 Ma. Biotite granodiorite from a small, separate pluton just north of the Chief Lake complex has a crystallization age of 1749+12/-8 Ma, based on analyses of igneous titanite. In the Grenville Front Tectonic Zone, the King's Island pluton has a primary zircon age of 1467+11/-7 Ma. Penetrative, thrust-sense ductile deformation within the Chief Lake complex predated intrusion of Sudbury diabase dykes at 1235 Ma, pointing to early or pre-Grenvillian deformation northwest of the Grenville Front.
Published Version
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