The Dizon Au-rich porphyry Cu deposit, 0.67 Mt Cu and 174 t Au, is hosted by diorite and andesite porphyry intrusions, dated at ~2.5 Ma. Amphibole and Fe-Ti oxides in relatively unaltered rocks were used to evaluate the magma conditions of intrusions. Parental magma for diorite porphyry was ~950°C at a depth of ~15 km, whereas the parental magmas for the andesite porphyry had lower temperatures, 760–820°C at a depth of ~5 km. The deposit formed at the locus of multiple intrusions, with evidence for injections of hot mafic magmas, including destabilization texture of plagioclase phenocrysts. Parental magmas at Dizon were oxidized, above FMQ + 2.0, and water-rich, >5 wt%, comparable to conditions of many large porphyry deposits elsewhere in the world. The occurrence of thick opacitic bands of amphibole in the diorite porphyry at Dizon reflects the release of aqueous fluids from the magma; such magmatic fluids were likely responsible for magmatic hydrothermal mineralization of the Dizon porphyry deposit. Subduction of the Scarborough Seamount caused a compressive regime in the overlying plate, which likely contributed to favourable tectonic conditions for mineralization.

中文翻译：

---

菲律宾 Dizon 矿与斑岩铜金矿化有关的火成岩

Dizon 富金斑岩铜矿床，0.67 Mt Cu 和 174 t Au，由闪长岩和安山斑岩侵入体组成，年代为~2.5 Ma。相对未改变的岩石中的角闪石和 Fe-Ti 氧化物用于评估侵入体的岩浆条件。闪长斑岩的母岩浆在~15公里的深度为~950°C，而安山斑岩的母岩浆温度较低，在~5公里的深度为760-820°C。沉积物形成于多个侵入体的位置，有证据表明注入了热的镁铁质岩浆，包括斜长石斑晶的不稳定结构。Dizon 的母岩浆被氧化，高于 FMQ + 2.0，并且富含水，> 5 wt%，与世界其他地方许多大型斑岩矿床的条件相当。Dizon 闪长岩斑岩中出现厚的不透明角闪石带，反映了岩浆释放的含水流体；这种岩浆流体可能是 Dizon 斑岩矿床岩浆热液矿化的原因。斯卡伯勒海山的俯冲导致上覆板块的压缩状态，这可能有助于成矿的有利构造条件。