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Geochemical evidence for mélange melting in global arcs
#MMPMID28435882
Nielsen SG
; Marschall HR
Sci Adv
2017[Apr]; 3
(4
): e1602402
PMID28435882
show ga
In subduction zones, sediments and hydrothermally altered oceanic crust, which
together form part of the subducting slab, contribute to the chemical composition
of lavas erupted at the surface to form volcanic arcs. Transport of this material
from the slab to the overlying mantle wedge is thought to involve discreet melts
and fluids that are released from various portions of the slab. We use a
meta-analysis of geochemical data from eight globally representative arcs to show
that melts and fluids from individual slab components cannot be responsible for
the formation of arc lavas. Instead, the data are compatible with models that
first invoke physical mixing of slab components and the mantle wedge, widely
referred to as high-pressure mélange, before arc magmas are generated.
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