Interaction between mantle-derived magma and lower arc crust: quantitative reactive melt flow modelling using STyx
Posted on 2018-04-10 - 15:25
The magmatic processes occurring in the lowermost arc crust play a major role in the evolution of mantle-wedge-derived melt. Geological evidence indicates that mantle-derived magmas and in-situ products of lower crust partial melting are reacting in a pervasive melt system and are eventually extracted towards higher levels of the crust. Resolving the relative contribution of mantle-derived magma and partial melting products of pre-existing crust is essential to: (1) quantify crustal growth rate; (2) better understand the compositional range of arc magmatic series; and (3) constrain the chemical differentiation of the lower crust. In this study, we present STyx, a new modelling tool, coupling melt and heat flow with petrology to explore the dynamics of storage, transfer and hybridization of melts in complex liquid/rock systems. We perform three models representing a magmatic event affecting an amphibolitic lower arc crust in order to quantify the relative contribution between partial melting of the pre-existing crust and fractional crystallization from mantle-derived hydrous-magma. Our models demonstrate that most of the differentiated arc crust is juvenile, deriving from the differentiation of mantle melts, and that pre-existing crust does not significantly contribute to the total thickness of magmatic products.
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Riel, Nicolas; Bouilhol, Pierre; van Hunen, Jeroen; Cornet, Julien; Magni, Valentina; Grigorova, Vili; et al. (2018). Interaction between mantle-derived magma and lower arc crust: quantitative reactive melt flow modelling using STyx. Geological Society of London. Collection. https://doi.org/10.6084/m9.figshare.c.4064747.v1
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AUTHORS (7)
NR
Nicolas Riel
PB
Pierre Bouilhol
Jv
Jeroen van Hunen
JC
Julien Cornet
VM
Valentina Magni
VG
Vili Grigorova
MV
Mirko Velic