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Geochemical data and whole-rock ^K-^Ar isotopic ages are presented for more than 50 igneous rocks (a majority of lavas and some plutonic bodies) sampled onshore (Philippine Archipelago: Tablas, Panay, Masbate, Mindanao, northern Borneo (Sabah), and north Sulawesi) around the Celebes and Sulu Seas. These data are compared with the ^K-^Ar ages obtained on drilled lavas along the Cagayan Ridge at ODP Sites 769 and 771 and with the major pyroclastic and tephras events recorded in the basins. Onshore ages range from 32 Ma to near 0 Ma for these rocks of generally calc-alkaline affinity with some shoshonitic high-K basalts. On the basis of geological data and kinematic reconstructions, two types of island arcs can be differentiated: those related to the progressive closing of the Celebes and Sulu marginal basins and those belonging to the Philippine Sea Plate. The combined age and chemistry for these two magmatic belts allow us to decipher the Neogene evolution of the complex zone of interaction of the Eurasian, Philippine Sea, and Australian plates.

Geochemistry and Isotopic Dating of Cenozoic Volcanic Arc Sequences around the Celebes and Sulu Seas