• journal_title：Geology
• Contributor：John Grocott ; Michael Brown ; R.David Dallmeyer ; Graeme K. Taylor ; Peter J. Treloar
• Publisher：Geological Society of America
• Date：1994-
• Format：text/html
• Language：en
• Identifier：10.1130/0091-7613(1994)022<0391:MOCGIE>2.3.CO;2
• journal_abbrev：Geology
• issn：0091-7613
• volume：22
• issue：5
• firstpage：391

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.