Miocene to Quaternary adakites and related rocks in Western Philippine arc sequences

Numerous Miocene to Quaternary occurrences of adakites and adakitic rocks are identified among the calc-alkaline magmatism from the Western Philippines. These rocks are associated with three different geodynamic frameworks, i.e. subduction, rifting (Macolod Corridor in Luzon) and collision (Palawan indentation of the Philippine archipelago). Slab, lower crust and sediment melting, coupled with assimilation-fractional crystallization, and mantle metasomatism by magmatic liquids are responsible for the generation of these rocks. The occurrence of the adakite–gold–copper relationship makes these areas good metallogenic exploration targets.