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We combined sand petrofacies with lithofacies to characterize sedimentation within unconformity-bounded sequences at Integrated Ocean Drilling Program (IODP) Expedition 317 sites drilled across the Canterbury shelf to the slope, located off the east coast of the South Island, New Zealand. Differentiation of the relative influence of along- and across-shelf sand supply in this system is made possible by the unique aspects of the onshore geology. Northern rivers draining mainly Torlesse composite terrane lithologies are dominated by lower-grade metamorphic lithic fragments, whereas central rivers, draining the Torlesse to schist (semi-schist) transition (Haast/Otago Schist), contain more higher-grade metamorphic lithic fragments, and...

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