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Regional-Scale Mid-Jurassic To Late Cretaceous Unroofing From The Adirondack Mountains Through Central New England Based On Apatite Fission-Track And (U-Th)/He Thermochronology, Mary K. Roden-Tice, Steven J. Tice
Regional-Scale Mid-Jurassic To Late Cretaceous Unroofing From The Adirondack Mountains Through Central New England Based On Apatite Fission-Track And (U-Th)/He Thermochronology, Mary K. Roden-Tice, Steven J. Tice
Mary K. Roden-Tice
Apatite fission-track (AFT) ages of 178 to 70 Ma for 108 samples from the Adirondack Mountains and eastern New York State, Vermont, western Massachusetts and Connecticut, and western New Hampshire indicate that widespread unroofing occurred throughout the region during the Middle Jurassic to Late Cretaceous. Additionally, (U-Th)/He ages of 167 to 85 Ma were determined on nine of those samples and support cooling rates of 1.8°-2.2°C/m.yr. from 100° to 65°C during the Middle Jurassic to Late Cretaceous. Assuming a geothermal gradient of 25°C/km, unroofing rates for the region were estimated to be, on average, ∼0.07-0.08 km/m.yr. The AFT age discontinuities …