Figure F3. Schematic cross section through the Mariana system showing various types of associations of serpentine mud volcanoes with faulting in the forearc wedge. Strike-slip faulting associated with along-strike extension and vertical tectonics related to seamount subduction both play a part in the tectonic deformation of the forearc and provide avenues for the ascent of slab-derived fluids and fault gouge from both the dècollement and the lithosphere of the overriding plate. Decarbonation reactions in the downgoing plate probably take place between ~15 and 20 km.
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