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Seminar class on the dynamics of subduction and accretionary orogenesis. Weekly readings discussed in class. Focus will be broad and process-based. Topics in subduction may include: (1) modes of global subduction through Earth history; (2) models of forced/triggered v. spontaneous subduction initiation; (3) arc development and implications for growth of continents; (4) subduction zone rollback and arc migration, and (5) subducted slab breakoff and tearing. Topics in accretionary orogenesis may include: (1) stress state of the overriding plate; (2) tectonic mode switches (shortening to extension and vice versa), and (3) length and time scales of the thermal manifestations of accretionary orogenesis.