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http://dx.doi.org/10.7582/GGE.2018.21.3.198

Numerical Modeling of Dehydration of Subducting Slab and Behavior of Expelled Water: A Preliminary Study  

Lee, Changyeol (Faculty of Earth Systems and Environmental Sciences, Chonnam National University)
Publication Information
Geophysics and Geophysical Exploration / v.21, no.3, 2018 , pp. 198-206 More about this Journal
Abstract
In this preliminary study, dehydration of the subducting slab and behavior of the expelled water are numerically modeled using 2-dimensional model scheme. The hydrated minerals in the oceanic crust of the subducting slab experience dehydration by increases in temperature and pressure and expel their water into the overlying mantle wedge. Behavior of the expelled water is governed by both the corner flow in the mantle wedge and porous flow of the expelled water through the pores of the mantle minerals. The effects of convergence rate and age of the subducting slab as well as grain size of the minerals on the dehydration of the subducting slab and behavior of the expelled water are evaluated. The water solubility of the oceanic crust measured from the laboratory experiments is considered for modeling dehydration of the oceanic crust. The model calculations show most of the hydrated minerals in the oceanic crust is dehydrated by a depth of 100 km and the effects of the convergence rate and age of the subducting slab on the dehydration of the subducting slab and behavior of the expelled water are not significant. The larger grain size allows faster porous flow of the expelled water through the oceanic crust, mantle wedge and overlying continental crust and reduces the volume fraction of the expelled water there. The developed technique will be used for future studies on arc volcanism and has a potential implication for the other fields such as seismic tomographic study.
Keywords
subduction; dehydration; porous flow; numerical modeling;
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