Pressure-driven processes explain the decreasing magnetization of the subducting oceanic crust in the Japan Trench

Abstract Despite the decreases in temperature and permeability of oceanic plates with increasing age, hydrothermal circulation (HC) can be rejuvenated 130-Ma old Pacific plate vicinity Japan Trench, substantially affecting thermal structure remaining amount magnetization (RAM). To decipher roles HC RAM, vigor extent Trench should quantitatively evaluated. Here we numerically show that is outer-rise zone but ceases after subduction owing to evolution. The calculated explains measured heat flow evolution negates HC-driven demagnetization, which was thought decrease RAM subduction. Instead, propose pressure-driven processes through demagnetizations titanomaghemite magnetite mineral phase transitions from maghemite hematite.