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结合岩体产出环境、时代及其与碧口火山岩的关系,认为铜厂石英闪长岩体是由碧口火山岩的局部熔融作用形成的。铜厂铜矿硫化物Pb 同位素特征显示出以浅源的地壳铅为主,并与碧口火山岩铅同位素组成的壳源端员重合,指示矿质与碧口火山岩之间存在密切关系。由于岩体与火山岩的同源性,所以脉状铜矿石既可能来自岩体也可能来自围岩。脉状硫化物Rb-Sr等时线年龄为199 Ma 左右,对应的初始Sr同位素表现出明显的富放射性特征,说明有岩体以外的物质加入,即改造成矿的特征。
Based on the relationship between the rock production environment, the age and its relationship with the Bikou volcanic rock, it is believed that the copper plant quartz diorite body is formed by local melting of the Bikou volcanic rock. The Pb isotopic characteristics of sulphides in Tongchang Copper Mine show that mainly shallow crustal lead is coincident with that of the lead source of Pb isotopic composition of the Bikou volcanic rock, indicating that there is a close relationship between mineral and the Bikou volcanic rock. Because of the homology of volcanic rocks and volcanic rocks, vein-like copper ores may come from both rock mass and surrounding rock. The Rb-Sr isochron age of vein-like sulfide is about 199 Ma, and the corresponding initial Sr isotopes show obvious radioactivity richness characteristics, indicating that the addition of materials other than the rock mass, that is, the characteristics of mineralization.