图1. 两种大洋俯冲带的示意图（据参考文献[11]修改）
(a)洋—陆俯冲带；(b)洋—洋俯冲带；主要展示发生在大洋俯冲带的一系列地质过程，诸如：俯冲板片的脱水作用/部分熔融、上覆地幔楔的交代变质与部分熔融、岩浆在地幔楔和地壳内的迁移以及地表岩石的风化、搬运、沉积等过程；值得一提的是，陆弧在更高的地势条件下，风化作用更加强烈，有更多的陆源沉积物组分在洋—陆俯冲带参与俯冲

Fig.1. Schematic diagrams of two types of oceanic subduction zones（modified after reference [11]）
Schematic diagrams of subduction zones of (a) Ocean-Continent subduction zone and (b) Ocean-Ocean subduction zone, showing a series of geological processes occurred in oceanic subduction zone: Metamorphic dehydration/partial melting of the subducting crust, crustal metasomatism of the mantle wedge, mantle melting and melt migration through the mantle wedge and the crust, weathering of the continental margin and transporting of the terrigenous sediment into subduction zones. Note that the terrigenous sediment is much more abundant in Ocean-Continent subduction zones than those Ocean-Ocean subduction zones owing to the severe weathering