Journal
ELEMENTS
Volume 11, Issue 2, Pages 99-104Publisher
MINERALOGICAL SOC AMER
DOI: 10.2113/gselements.11.2.99
Keywords
subduction; arc magmatism; batholiths; magmatic addition rates; Phanerozoic
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Funding
- National Science Foundation through the USGS EDMAP program [NSF EAR-1019525, NSF EAR-0907880, NSF EAR-0537892, EAR-0073943]
- Romanian state-funding agency UEFISCDI [PN-II-ID-PCE-2011-3-0217]
- Division Of Earth Sciences
- Directorate For Geosciences [1019636] Funding Source: National Science Foundation
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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 similar to 50% recycled upper-plate crust and mantle lithosphere; the remaining similar to 50% comes from the mantle wedge.
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