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Growth of continental crust requires addition of juvenile material from the mantle and/or oceanic lithosphere. Large-scale addition is most likely to occur by accretion of oceanic arcs and continental arc magmatism. Therefore, evaluation of fluxes of new crustal material into continents requires testing for crustal recycling by melting of older crust and reincorporation of continental sediments into continental arcs. This work uses isotopic data and pressure-temperature-time (P-T-t) paths to evaluate the juvenile sedimentary contribution to crustal growth versus evolved sedimentary rocks recycled from preexisting continental crust in the Cretaceous Cascades magmatic arc.

Neodymium isotope ratios for 91–75...

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