The distinct morphologic signature of underplating and seamounts in accretionary prisms, insights from thermomechanical modeling applied to Coastal Iranian Makran

The active structures of the Iranian Makran, especially presence normal faults, vary laterally in upper plate subduction zone, and their relationship with deep duplexes seamounts at depth remains unknown due to poor coverage data onshore. In this paper, we investigate between topographic slope using thermo-mechanical simulations. initial boundary conditions models, including basal heat flux convergence rate, are calibrated seafloor, bottom seafloor reflectors few available well temperature. We specifically test influence seamount thermally controlled changes rock strength décollement on topography tectonic structures. inclusion brittle-ductile transition dehydration reactions like smectite-illite produce three segments observed Makran accretionary prism. correspond a regular prism, flat segment that marks transition, rise located above zone where tegument reaches its temperature-controlled causing underplating. Nevertheless, models show neither decrease friction associated nor onset underplating is sufficient for faults arise self-consistent manner from Crustal-scale only emerge simulations include large seamount. These also large-thrust-slice scar former subducting serves as buttress formation new imbricated zone. Using offshore seismic reflection data, published onshore tomographic profiles, our simulations, propose two onshore-offshore cross-sections