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Early Cretaceous Normal Faulting In Southern New England: Evidence From Apatite And Zircon Fission-Track Ages, Mary K. Roden-Tice, Robert P. Wintsch
Early Cretaceous Normal Faulting In Southern New England: Evidence From Apatite And Zircon Fission-Track Ages, Mary K. Roden-Tice, Robert P. Wintsch
Mary K. Roden-Tice
New apatite and zircon fission‐track (AFT, ZFT) ages from Mesozoic sediments and adjacent crystalline rocks from southern New England reveal age gradients from Middle Jurassic to Early Cretaceous. These gradients reflect the rotation of crustal blocks after the setting of the youngest AFT ages (∼140 Ma). The AFT ages of 168–98 Ma for 32 samples of Paleozoic metamorphic rocks east and west and within the Hartford Basin of Massachusetts and Connecticut indicate that unroofing in these regions occurred from Late Jurassic through Early Cretaceous. In both the Hartford Basin and rocks from crystalline terranes east of the basin, AFT ages …