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We investigate the relationship between tectonism and sedimentation by integrating 587 new U-Pb detrital zircon analyses from 6 sandstones in the Karoo Basin with stratigraphic age controls from 590 U-Pb tuff zircon analyses from 23 volcanic tuffs. U-Pb detrital zircon from the Karoo Supergroup indicates that the source of the turbiditic, deltaic, and fluvial sediments was an active volcanic province, with lesser contribution from the nearby Cape Fold Belt. The depositional ages obtained from the turbidites of the Karoo Basin, based on U-Pb zircon tuff ages, and the published ages for Cape Fold Belt, suggest that influx of course clastic sediment is synchronous with deformation in the adjacent Cape Fold Belt during the Gondwanan Orogeny. Deformational age estimates from the Cape Fold Belt are comparable to age estimates for orogenic deformation and metamorphism around the southern margin of Gondwana, suggesting a wide-spread, synchronous, regional orogenic event. U-Pb zircon from volcanic suites in South Africa and South America coupled with U-Pb zircon from midcrustal plutonic rocks indicate that peak magmatism occurs between deformation events and predates turbidite deposition. Along this convergent margin, turbidite sedimentation appears to coincide with a major deformational phase, while magmatism is out-of-phase with deformation and turbidite sedimentation. While structural development of the Cape Fold Belt likely controlled the entry point of sediment into the basin, the main control on the influx of clastic sediment into the Karoo Basin may be increased volcanism along the Gondwanan margin. The large volume of volcanic detritus suggest synchronous sediment routes into the basin that could by-pass the emerging Cape Fold Belt. Ejecta could be transported via atmospheric transport independently from aqueous transport pathways and continental drainage divides to the To be submitted to Basin Research as: McKay, M.P., Fildani, A., Weislogel, A.L., Dean. J., Structural and magmatic controls on turbidite system development: Karoo Basin, South Africa

Integrated geochronology and petrogenesis of volcanic suites for tectonic sedimentary studies: Karoo Basin, South Africa