The architecture, chemistry, and evolution of continental magmatic arcs

Mihai N. Ducea, Jason B. Saleeby, George Bergantz

Research output: Contribution to journalArticle

155 Scopus citations

Abstract

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) residual materials, 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.

Original languageEnglish (US)
Pages (from-to)299-331
Number of pages33
JournalAnnual Review of Earth and Planetary Sciences
Volume43
DOIs
StatePublished - May 30 2015

Keywords

  • Arc magmatism
  • Continental
  • Crustal growth
  • Crustal sections
  • Geochemistry

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science

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