Controls of focused fluid release in subduction zones: insights from experimental dehydration of brucite vein networks in serpentinite.

ABSTRACT: Aqueous fluids released by metamorphic dehydration of serpentinites are a key component for seismicity, creep, and geochemical cycling in subduction zones. How these fluids drain and migrate towards the mantle wedge has yet to be fully understood. Here we address the influence of pre-existing structural and mineralogical heterogeneities in serpentinites on dehydration and fluid migration at forearc conditions. We partially dehydrated natural serpentinite containing brucite veins in a piston-cylinder apparatus with a temperature gradient across the conditions of the brucite + antigorite = olivine + fluid reaction (485-520 °C; 1.5 GPa). Micro-tomography, electron microscopy and microstructural analysis of the experimental results, coupled with thermodynamic modelling, show that temperature,

SUBMITTER: Menzel MD 

PROVIDER: S-EPMC12006270 | biostudies-literature | 2025

REPOSITORIES: biostudies-literature