Abstract:Following Appalachian orogenesis, metamorphic rocks in central Newfoundland were exhumed and reburied under Tournaisian strata. New zircon fission-track (ZFT) ages of metamorphic rocks below the Tournaisian unconformity yield post-depositionally reset ages of 212-235 Ma indicating regional fluid-absent reheating to at least ≥220°C. Post-Tournaisian sedimentary thicknesses in surrounding basins show that burial alone cannot explain such temperatures, thus requiring that palaeogeothermal gradients increased to ≥… Show more
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