Collaborative Proposal: 4-D Assessment of the Earliest Stages of Magmatism in a Continental Margin Arc

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0000719 Beard0001004 Crawford0001102 SinhaAs exotic material accretes to a continental margin by convergent tectonics, a number of important changes in conditions occurs, some of which lead to production of magma that subsequently becomes involved in the ongoing structural development of the accretion. As tonalitic plutons are commonly generated as continental margin arcs accrete, their composition provides information about the P-T-X H2O conditions of the source region, and combined with fabric and structural data, provide constraints for the transport and emplacement processes that might lead to chemical modification of magmas as they traverse and are emplaced in the crust. The project will utilize a suite of tonalitic plutons on Revillagigedo Island in southeastern Alaska that record early stages of continental arc magmatism. Results are expected to detail and track the origin, modification and tectonic interactions of these magmas in this convergent setting.