Cooling and inferred uplift/erosion history of the Grenville Orogen, Ontario: Constraints from argon-40/argon-39 thermochronology

In this thesis field observations and laboratory data are related to the regional cooling and uplift/erosion history of the Grenville Province in Ontario. The conclusions reached during this investigation provide important constraints for tectonic models of the evolution of this ancient mountain belt. Equally important, these results provide a quantitative measure of the time involved in mountain building processes, thus yielding fundamental insights into phenomena that continually act to reshape the face of our planet.;Thermochronological (;Regional uplift/erosion rates for the Grenville Orogen of Ontario have been estimated from the ;Different terranes within the CMB preserve hornblende ;Twenty-two of the hornblendes used for thermochronology have been quantitatively analyzed for major elements by microprobe, Fe;Water activities (aH...