New Nd isotopic data suggest that Paleozoic turbidites in the Ouachita fold belt (Arkansas and Oklahoma) had a dominantly Appalachian provenance after Middle Ordovician time. We infer a long-lived sedimentary dispersal system of isotopically homogeneous detritus linked to Appalachian tectonics. By Carboniferous time, both the continental surface and the closing Ouachita trough were apparently flooded with sediment derived from the Appalachian collisional orogen.

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