Journal
ANNUAL REVIEW OF EARTH AND PLANETARY SCIENCES, VOL 43
Volume 43, Issue -, Pages 299-331Publisher
ANNUAL REVIEWS
DOI: 10.1146/annurev-earth-060614-105049
Keywords
arc magmatism; continental; crustal sections; geochemistry; crustal growth
Funding
- Directorate For Geosciences
- Division Of Earth Sciences [1524110, 1008527] Funding Source: National Science Foundation
- Division Of Earth Sciences
- Directorate For Geosciences [1049884] Funding Source: National Science Foundation
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Continental magmatic arcs form above subduction zones where the upper plate is continental lithosphere and/or accreted transitional lithosphere. The best-studied examples are found along the western margin of the Americas. They are Earth's largest sites of intermediate magmatism. They are long lived (tens to hundreds of millions of years) and spatially complex; their location migrates laterally due to a host of tectonic causes. Episodes of crustal and lithospheric thickening alternating with periods of root foundering produce cyclic vertical changes in arcs. The average plutonic and volcanic rocks in these arcs straddle the compositional boundary between an andesite and a dacite, very similar to that of continental crust; about half of that comes from newly added mafic material from the mantle. Arc products of the upper crust differentiated from deep crustal (> 40 km) residualmaterials, which are unstable in the lithosphere. Continental arcs evolve into stable continental masses over time; trace elemental budgets, however, present challenges to the concept that Phanerozoic arcs are the main factories of continental crust.
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