南京大学学报(自然科学版) ›› 2018, Vol. 54 ›› Issue (2): 366.
郭 飞1,2,王智琳1,2*,许德如3,董国军4,宁钧陶4,王 展1,2,邓 腾3,于得水3,崔 宇5
Guo Fei1,2,Wang Zhilin1,2*,Xu Deru3,Dong Guojun4,Ning Juntao4,Wang Zhan1,2,Deng Teng3,Yu Deshui3,Cui Yu5
摘要: 湘东北大型栗山铅锌铜多金属矿床位于幕阜山岩体边部,矿体赋存于岩体及其内外接触带中的硅化构造角砾岩带内. 根据野外调查和显微岩(矿)相学观察,可将栗山矿床的主成矿期——热液成矿期划分为四个阶段:粗粒石英+萤石+绿泥石(ChlⅠ)+少量黄铁矿+黄铜矿阶段(Ⅰ)、石英+萤石+绿泥石(ChlⅡ)+黄铜矿+黄铁矿阶段(Ⅱ)、石英+萤石+绿泥石(ChlⅢ)+闪锌矿+黄铜矿+方铅矿阶段(Ⅲ)、细粒石英+少量黄铜矿+黄铁矿细脉阶段(Ⅳ). EPMA分析结果表明ChlⅠ为蠕绿泥石,ChlⅡ和ChlⅢ为鲕绿泥石-铁镁绿泥石. 根据绿泥石温度计,估算出阶段Ⅰ,Ⅱ,Ⅲ的成矿温度分别为239 ℃~280 ℃,221 ℃~261 ℃和212 ℃~238 ℃. 结合闪锌矿硫逸度计算,表明栗山矿床形成于中温、低氧逸度、低硫逸度的环境. 硫化物的δ34S(-4.7‰~1.5‰)变化较小且接近零值,表明成矿流体主要来源于岩浆热液. 通过与钦杭成矿带上典型的铅锌矿床对比,提出栗山矿床为与岩浆热液有关的中温热液充填交代成因.
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