吉林荒沟山铅锌矿区含矿碳酸盐建造中角闪绿泥片岩原岩恢复及其地质意义

THE SIGNIFICANCE AND THE RECONSTRUCTION OF THE ORIGINAL ROCK TYPE OF THE HORNBLENDE GREEN SCHIST IN THE ZHENZHONMEN FORMATION, HUANGGOUSHAN AREA, JILIN PROVINCE

本文主要根据野外地质产状,结合其岩石化学和稀土元素地球化学方法对吉林荒沟山铅锌矿区含矿碳酸盐建造中角闪绿泥片岩的原岩进行恢复,其结果为拉斑玄武质火山碎屑岩,属大陆拉斑玄武岩系列。并对其作为矿区的标志层,成矿作用圈闭的隔挡层,暗示本区岩石构造环境属大陆裂谷带,指示成矿物质初始来源可能是幔源等地质意义作了初步探讨。

The hornblende green-schist represents a kind of continental tholeiitic volcanic clastic rock as identified by its geochemical chracaters of the major chemical elements and its REE patterns.The schist is of importance in that: 1. it is an index bed for the subdivision of the ore-bearing rock-Zhenzhumen Formation; 2. it is an impermeable bed which with the slumped, fractured and folded carbonate together makes a trap for the ore-bearingfluid. Therefore, it is a target in prospecting; 3. it reflects that the source material of the Pb-Zn deposit was Coming from mantle through volcanic eruption; and 4. it implys a rift geological setting.