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Abstract This study utilizes a two-dimensional high-resolution thermodynamic-mechanical coupled model to explore the intricate processes of deep-seated plate hydration and dehydration, as well as the consequent magmatic activities within ocean-continent subduction zones. The research illuminates the mechanism by which hydrated plates release water during profound subduction phases. Notably, dehydration processes at depths exceeding 300 kilometers play an essential role in driving the magmatic activities of the mantle. Moreover, these processes significantly catalyze the partial melting of the mantle, leading to pronounced magmatic activities and the subsequent rise of molten material, culminating in the formation of magma chambers beneath remote continental plates. These insights could potentially contribute to a deeper understanding of the intricate hydrothermal interactions within subduction zones and how they might influence the Earth's internal dynamics.
Wu et al. (Tue,) studied this question.