与火山—潜火山作用有关的浅成热液金(铜银)矿床流体成矿系统

Ore-forming Fluid System of Epithermal Gold-Copper-Silver Deposits Related with Volcanism and Subvolcanism

与火山—潜火山作用有关的浅成热液金(铜银)矿床可以分为低硫型和高硫型两个亚类,所对应的流体成矿系统分别为贵金属(地热)成矿系统和火山-热液成矿系统。由于成矿位置和流体成矿过程不同,形成了各具特色的成矿元素组合、围岩蚀变特征和成矿类型。

Epithermal Au-(Cu-Ag) deposits occur largely in volcano-plutonic arcs associated with volcanism and subvolcanism, with ages similar to volcanic activity. Two end-member styles of epithermal Au-(Cu-Ag) deposits, high sulfidation and low sulfidation, have been identified. Based on research, these two deposit styles are formed from fluid system of distinctly different chemical composition in contrasting volcanic environment. Mineralizing age of Epithermal Au-(Cu-Ag) deposits in east China are relatively old than other countries, and mainly berccia-pipe type and porphyry type.