The Dynamics of Forearc – Back?Arc Basin Subsidence: Numerical Models and Observations From Mediterranean Subduction Zones

The subsidence history of forearc and back-arc basins reflects the relationship between subduction kinematics, mantle dynamics, magmatism, crustal tectonics, surface processes. distinct contributions these processes to topography variations active margins during initiation, oceanic subduction, collision are less understood. We ran 2D elasto-visco-plastic numerical models including hydration show evolution wedge-top retro-forearc on continental overriding plate, separated by a high. They affected repeated compression extension phases. Compression-induced is recorded in syncline structure basin from onset subduction. 2–4 km upper plate negative residual produced gradually steepening slab, which drags down plate. Trench retreat leads slab unbending decreasing dip angle that trench-ward tilting. Back-arc either formed along inherited weak zones at large distance arc or created above hydrated wedge originating rifting. primarily governed thinning controlled roll-back supported underlying convection. High convection velocities result wavelength dynamic topography. Collision linked uplift basins; however, records ongoing soft collision. During hard collision, both ultimately compression. Our modeling results provide insights into Mediterranean zones.