− | Subduction zone generates zone of accumulation of sediments in the trench and on overriding plate. Trench becomes sites of deposition for marine sediments and also for sediments brought by the downgoing plate. Characteristic deposit in trench is mélange. Boggs<ref name=Boggs>Boggs, Sam, Jr., 2011, Principles of Sedimentology and Stratigraphy Fifth Edition. New Jersey: Pearson Prentice Hall.</ref>defines mélange as mixed assemblage of rock consisting of brecciated blocks in a highly shear matrix. Zone of accumulation on the overriding plate includes forearc, backarc, intraarc, and retro-arc basins. The formation of extensional regime in subduction zone is related to the angle of downgoing plate. As discussed before, subduction zone with steep angle of downgoing plate generates extensional forces on the overriding plate. | + | Subduction zone generates zone of accumulation of sediments in the trench and on overriding plate. Trench becomes sites of deposition for marine sediments and also for sediments brought by the downgoing plate. Characteristic deposit in trench is mélange. Boggs<ref name=Boggs>Boggs, S., Jr., 2011, Principles of Sedimentology and Stratigraphy Fifth Edition. New Jersey: Pearson Prentice Hall.</ref>defines mélange as mixed assemblage of rock consisting of brecciated blocks in a highly shear matrix. Zone of accumulation on the overriding plate includes forearc, backarc, intraarc, and retro-arc basins. The formation of extensional regime in subduction zone is related to the angle of downgoing plate. As discussed before, subduction zone with steep angle of downgoing plate generates extensional forces on the overriding plate. |