High-volume magmatic events in subduction systems

Mihai N. Ducea, Scott R. Paterson, Peter G. DeCelles

Research output: Contribution to journalArticle

75 Scopus citations

Abstract

The world's biggest Phanerozoic magmatic arcs formed above subduction zones and comprise the products of continuous magma emplacement into the crust over periods of up to 500 My. However, the intensity of magmatic activity can vary significantly. Punctuated magmatic events lasting from 5 to 20 My can dwarf the volume of magmas generated through the remainder of an arc's history: these high-volume events are called "flare-ups" and can completely rebuild an arc's crust. In arcs formed on continental lithosphere, flare-ups typically correlate with regional structural events that shorten and/or thicken the crust. Geochemical and isotopic signatures show that these high magmatic addition rate events involve ∼50% recycled upperplate crust and mantle lithosphere; the remaining ∼50% comes from the mantle wedge.

Original languageEnglish (US)
Pages (from-to)99-104
Number of pages6
JournalElements
Volume11
Issue number2
DOIs
StatePublished - Apr 1 2015

Keywords

  • Arc magmatism
  • Batholiths
  • Magmatic addition rates
  • Phanerozoic
  • Subduction

ASJC Scopus subject areas

  • Geochemistry and Petrology
  • Earth and Planetary Sciences (miscellaneous)

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