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Late Cretaceous to early Paleocene deformation and metamorphism of strata of the Kahiltna basin varies in depth and style from east to west during the collision of the Wrangellia composite terrane. In the east, the Maclaren Glacier metamorphic belt experienced kyanite-grade regional metamorphic conditions of 650 °C at >670 MPa during top-to-the-south thrusting. About 100 km along strike to the west, the Devil Creek area experienced contact metamorphic conditions at 300 MPa forming andalusite, with sillimanite migmatite near pluton margins. Three plutons from the Devil Creek area yield U-Pb zircon ICP-MS dates of 68.3 ± 2.6 Ma, 66.1 ± 2.6...

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