Miocene to Quaternary adakites and related rocks in Western Philippine arcsequences

Numerous Miocene to Quaternary occurrences of adakites and adakitic rocks a re identified among the calc-alkaline magmatism from the Western Philippine s. 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 m etasomatism 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. (C) 2001 Academie des sciences / Editions scientifiques et medicales Elsevier SAS.