The low-pressure/high-temperature metamorphism of the Chugach metamorphic complex (Alaska) occurred in an ocean-continent convergence zone. To achieve the high temperatures at a relatively shallow depth in an accretionary prism, we propose the large-scale transport of heat by fluids, which preheated the metamorphic belt by tectonic focusing of fluids followed by injection of melts, both of which were generated downdip in a shallow subduction zone.

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