Models for crustal recycling are based upon estimates of the amount of material being returned to the mantle today; thus, a better understanding of those processes will help to constrain the models. We suggest—through the use of an Early Proterozoic example in the Wopmay orogen—that failure of the subducting slab during collision leads to large quantities of crustal material being recycled into the mantle, that this process has been active since the Early Proterozoic, and that it may explain the paucity of rift deposits in other orogens.

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