Achieving complete reaction while the solid volume increases: A numerical model applied to serpentinisation

Solid volume increases during the hydration of mantle rocks. The fluid pathways necessary to feed reaction front with water can be filled by low density products. As a result, dries out and stops at progress. This process porosity clogging is generally predicted dominate in reactive transport models, even when processes such as reaction-induced fracturing are considered. These predictions not consistent observations mid-ocean ridges where dense rocks completely replaced serpentine minerals. To solve this issue, we develop numerical model coupling reaction, flow deformation. High extents only achieved considering that increase solid accommodated through deformation rather than clogging. generate an overpressure depends on extent boundary conditions. induces viscoelastic compaction limits reaction. serpentinisation rate therefore controlled accommodation change thus deformation, either induced itself or tectonic processes.