甘肃省肃北县豹子沟南铜金矿床成因初探

Genesis of Baozigou South Copper Gold Deposit,Subei County,Gansu Province

豹子沟南铜金矿床共圈定了5条铜矿体和4条金矿体,矿床形成受含矿层位和控矿构造两大因素的制约,区内香毛山岩组蛇纹岩中金元素平均含量高于地壳克拉克、斜长角闪岩中Cu元素平均含量高于地壳克拉克值,说明两种岩性为含矿母岩,是本区矿源层。应理解为深部流体沿后期构造把铜、金等成矿物质带到近地表海底形成含铜、金的矿源层。其后由于加里东后期基性岩沿控矿裂隙贯入,再富集形成脉状、透镜状铜金矿体。

Five copper orebodies and four gold orebodies have been delineated in the Baozigou South copper-gold deposit,the average content of gold in the ophiolite of Xiangmaoshan formation in the area is higher than that of Cluck in the crust and that of Cu in the amphibolite is higher than that of Clark in the crust.It should be understood that the deep fluid carried the ore-forming materials such as copper and gold to the seabed near the surface along the late structure to form the source bed containing copper and gold.After that,the basic rocks in the late Caledonian run in along the ore-controlling fissures,and then enrich to form vein-like and lens-like copper-gold orebodies.