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Adakites are intermediate or acidic volcanic and plutonic rocks which derive from partial melting of subducted oceanic crust when the subducting slab is young (< 20 Ma) and hot, and at the start and the end of subduction. In the Philippines, most of porphyry Cu and epithermal Au deposits are either spatially and temporally related or cogenetic with these rocks and related magmas (Nb-enriched basalts...
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