西环太平洋菲律宾群岛中酸性岩浆活动与斑岩型铜金成矿:兼论埃达克岩与斑岩型铜金成矿

Intermediate-acid magmatism and porphyry Cu-Au mineralization in the Philippine Islands,western Pacific Rim:on genesis of adakite and porphyry Cu-Au mineralization

以菲律宾岛弧构造岩浆作用和斑岩型铜金成矿作用为例,以与板块俯冲相关的深部物质循环和斑岩型铜金成矿为研究对象,综述了铜金在弧岩浆中复杂的地球化学过程和行为。通过对中酸性岩浆活动与区域斑岩铜金成矿响应进行系统综述,根据以往对菲律宾群岛中新生代岛弧岩浆岩和斑岩型铜金成矿开展的地质地球化学研究,提出有利于成矿的地球化学指标,探讨了西环太平洋菲律宾群岛中酸性岩浆活动对区域铜金等多金属矿床的贡献,总结区域成矿规律,建立成矿动力学模式。通过研究菲律宾群岛周缘中新生代板块俯冲洋壳重熔岩浆作用及矿床形成机理,进一步揭示板块俯冲过程中以流体为纽带的物质和能量交换及斑岩型铜金成矿效应。

Taking deep material circulation and porphyry copper-gold mineralizaion related to the subduction of the western Pacific plate as research objects,this study reviewed the complex geochemical process and behavior of copper-gold in arc magmas by focusing on the research of tectonic magmatism and porphyry copper-gold magmatism in Philippine island arc.According to systematic review on intermediate-acid magmatic activity and porphyry copper-gold mineralization in response to the constraints from the tectonic evolution of western Pacific plate,this paper conducted detailed geological-geochemical research on the key carrier of Mesozoic-Cenozoic island arc magmatic rocks and porphyry copper gold deposits,identified geochemical indicators conducive to mineralizaiton as well as explored its contribution to the forming of regional copper-gold polymetallic deposits,and finally summarized the regional metallogenic regularity and built metallogenic dynamics model.By studying the island arc magma originated from oceanic crust remelting and the formation mechanism of mineral deposits controlled by the subduction of Mesozoic and Cenozoic plates,this paper further explore some important issues of the oceanic crust and mantle in the process of plate subduction.