Geochemical Characteristics of Intrusive Rocks, Southeastern Mindanao, Philippines: Implication to Metallogenesis of Porphyry Copper-gold Deposits |
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| Authors: | Leilanie Osano Suerte Akira Imai and Sho Nishihara |
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| Institution: | Department of Earth Resources Engineering, Kyushu University, Fukuoka, Japan, and;Mines and Geosciences Bureau Region IV, Department of Environment and Natural Resources, Iloilo, Philippines |
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| Abstract: | This paper describes petrologic and geochemical characteristics of intrusive rocks associated with porphyry copper deposits in south-eastern Mindanao, the Philippines, where the Kingking deposit is located. Intrusive rocks at the Kingking deposit, are classified into biotite-bearing diorite porphyry, hornblende diorite porphyry and diorite porphyry. Intrusive rocks in other areas in south-eastern Mindanao, including Batoto, Bukal, Maragusan, Masara, Amacan and Sumlog, are hornblende diorite porphyry and hornblende quartz diorite. They are adakitic in Sr/Y-Y diagram, but not in La/Yb-Yb diagram due to relatively low REE contents. The magmas are oxidizing as suggested by the high XMg of mafic silicate phenocrysts and SO3 contents of microphenocrystic apatite. An Oligocene-Miocene diorite intrusive complex formed by calc-alkaline, hydrous, oxidizing magma is considered to be associated with porphyry-type copper-gold mineralization. |
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| Keywords: | diorite intrusive rocks Kingking Mindanao Philippines porphyry Cu-Au deposit |
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