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Interaction between mantle-derived magma and lower arc crust : quantitative reactive melt flow modelling using STyx

Riel, N. ; Bouilhol, P. ; Van Hunen, J. ; Cornet, J. ; Magni, V. ; Grigorova, V. ; Velic, M., Geological Society of London Special Publication

Interaction between mantle-derived magma and lower arc crust : quantitative reactive melt flow modelling using STyx

Riel, N. ; Bouilhol, P. ; Van Hunen, J. ; Cornet, J. ; Magni, V. ; Grigorova, V. ; Velic, M.

Geological Society of London Special Publication, 2018, 478.

Abstract :

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

Voir en ligne : https://doi.org/10.1144/SP478.6




publié vendredi 20 avril 2018