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Episodes of Barren to Fertile Porphyry Copper Deposit Magmatism on a Complex Island Arc System: Insights from the Igneous Host Rocks of the Suyoc Epithermal Prospect, Northern Luzon, Philippines

Based on new U-Pb zircon ages coupled with whole-rock and in-situ geochemical analyses of igneous host rocks in the Suyoc epithermal prospect, chronologic barren to fertile episodes were identified for the Baguio-Mankayan Mineral District in northern Luzon, Philippines: 1) Late Eocene (36.93 ± 0.62 Ma) barren magmatism associated with a thin, nascent Luzon arc. ; 2) fertile Pliocene (2.87 ± 0.23 Ma and 3.18 ± 0.77 Ma) magmatic event associated with subduction of the Scarborough ridge along the Manila Trench (MT) and 3) Pleistocene (<1 Ma) fertile magmatism associated with slab melting triggered by buoying of the MT subduction angle. The barren Eocene magmatic event, characterized by negative Eu anomalies and lower Sr/Y and V/Sc ratios, is considered as a significant factor in enhancing source and intra-crustal conditions for the onset of younger fertile magmatic events via sub arc modification and crustal addition/thickening. Furthermore, we consider the fertile (high Sr/Y and V/Sc ratios) Pliocene