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Numerical Modeling of Thermal Structure and Magmatism in Subduction Zones
Iwamori Hikaru CHOSUN UNIVERSITY 1997 Basic Science and Engineering Vol.1 No.1
Mantle convection and thermal structure in subduction zones have been unmerically studied for various heat sources and mechanical boundary conditions. The results suggest that subduction zones are rapidly cooled and can produce melts only within the first ∼100 m.y. after the initiation of subduction, if standard heat sources are assumed. Geological evidences and the corresponding numerical studies suggest that subduction of young hot oceanic plate, including ridge subduction, is important for explaning both long-term heat balance and short-term heat source for intermittent magmatism, melting in the mantle wedge of subduction zones is thought to be caused by introduction of H₂O from the subducting slab. Transportation of H₂O, interaction with convecting solid mantle, and consequent melting have been numerically modeled, in order to discuss the detail of the material recycling and melting in subduction zones. The results suggest that H₂O is supplied to the source region of magmatism by (1) subduction to 150∼km depth hosted by solid, (2) upward migration as aqueous fluid, and (3) lateral migration from backarc to beneath volcanic front hosted by melt and solid.