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Upper Jurassic to Upper Cretaceous forearc basin strata exposed in south-central Alaska record variations in sedimentary basin development associated with late Mesozoic terrane accretion and translation of the Insular terranes (Alexander-Wrangellia-Peninsular) along the western North American margin. Upper Jurassic strata contain a dominant population of Late Jurassic (ca. 150 Ma) detrital zircons with juvenile to intermediate isotopic compositions (εHf[t] >5) that reflect sediment input from the adjacent oceanic Talkeetna arc, located to the north in a marine forearc basin. By Early Cretaceous time, Early–Late Jurassic (ca. 160 and 198 Ma) and minor Late Devonian–Permian detrital zircon...

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