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1 School of Geological Sciences, Kingston University, Kingston-upon-Thames KT1 2EE, United Kingdom
2 Department of Geology, University of Maryland, College Park, Maryland 20742
3 Department of Geology, University of Georgia, Athens, Georgia 30602
4 Department of Geology, University of Plymouth, Drake Circus, Plymouth PL4 8AA, United Kingdom
During the Late Triassic, Jurassic, and Early Cretaceous, an extensional magmatic arc was formed in the Andean margin of northern Chile. Plutons emplaced at ramps within a hinterland-propagating extensional duplex were fed by dikes that transferred magma through the lower crust from a reservoir in the mantle Phases of volcanism separated phases of plutonism, and our model demonstrates that plutonism was favored only when upper-plate extensional fault systems were active. When they were not, dikes cut across inactive faults, and magma rose directly to the surface during volcanic phases of arc growth.
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