摘要
The subduction channel is the dynamic site of mass and energy exchange between the slab and mantle. It is evolved into the subduction factory by processing raw materials into different products. The raw materials are sedimentary crust, igneous crust, and lithospheric mantle （juvenile or ancient）. They are carried with the subducting slab and undergo physicochemical modification by metamorphic dehydration and partial melting, producing metasomatic agents in the forms of aqueous solutions,
The subduction channel is the dynamic site of mass and energy exchange between the slab and mantle. It is evolved into the subduction factory by processing raw materials into different products. The raw materials are sedimentary crust, igneous crust, and lithospheric mantle （juvenile or ancient）. They are carried with the subducting slab and undergo physicochemical modification by metamorphic dehydration and partial melting, producing metasomatic agents in the forms of aqueous solutions,
