Which phenomenon primarily regulates magma generation during subduction at convergent plate boundaries?

💡 Explanation

When the subducting plate descends, water is released from hydrous minerals, reducing the mantle's melting point through flux melting, and allowing magma generation. Therefore, hydration-induced melting primarily regulates magma production, rather than plumes, crustal thickening, or radiogenic heating, mechanisms operating under different contexts.

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