Electrical conductivity in texturally equilibrated fluid-bearing forsterite aggregates at 800 ºC and 1 GPa: implications for the high electrical conductivity anomalies in mantle wedges

Abstract

In subduction zones, aqueous fluids released from the subducting slab percolate through the mantle wedge, controlling arc magma genesis, and element recycling (e.g., Hermann et al., 2006;Iwamori, 1998;Tatsumi, 1986;van Keken et al., 2011). Although the pore fluid preserved in the subducting oceanic lithosphere will be expelled by compaction at relatively shallow depth, hydrous minerals may effectively carry water deep into the mantle and release it through dehydration reactions upon progressive metamorphism. Because the presence of fluid significantly enhances the bulk electrical conductivity of rocks (e.g., X.