安徽庐江鼓架山铜矿床成因分析

Genetic analysis of the Gujiashan copper deposit in Lujiang,Anhui

安徽庐江鼓架山铜矿位于郯庐、黄破断裂带与矾山-铜陵断裂复合部位,庐枞火山盆地西北外缘,滁州-庐江构造岩浆带的西南部。矿区含铜岩体的来源具有壳-幔混染型特点,成矿流体主要由岩浆水组成,碳和硫同位素含量范围属于地幔范畴,充分说明成矿流体和物质具有地幔源区的特点。鼓架山斑岩型铜矿的主成矿温度为250~480℃,属于典型的中高温热液斑岩型矿床。

The Gujiashan copper deposit,Lujiang,Anhui province is located where the Tan-Lu and Huang-Po fault belts meet with the Fanshan-Tongling fault,at the northwestern outskirt of the Luzong volcanic basin,and in the southwestern part of the Chuxian-Lujiang tectonic magmatic belt.The source of the copper-bearing rock mass in the mineral district is characterized by crust-mantle mixing,the ore-forming fluid is mainly composed of magmatic water,and the contents of carbon and sulfur isotopes fall in the domain of the mantle,which fully indicates that the ore-forming fluid and material have the characteristics of the mantle source area.The main metallogenic temperature of the Gujiashan porphyry copper deposit is 250-480℃,which is a typical medium-high temperature hydrothermal porphyry deposit.