摘要
通过对老厂矿区铅锌矿床中存在的闪锌矿脉和方铅矿脉的地质特征、单矿物特征元素、矿物包裹体成分特征和稳定同位素示踪的综合研究结果表明.二者的成矿物质来源和成因不同。根据基底和盖层中矿化类型的不同、基底容矿构造被盖层沉积覆盖、花岗岩时代、基底不整合面上有Pb元素古次生晕存在的特点,表明基底和盖层中矿床的成矿时代是不同的。矿床中包括了加里东期沉积改造型闪锌矿床成矿系列和岩浆热液型方铅矿床成矿系列,华力西期沉积改造型(铅)锌矿床成矿系列。以上分属于不同时代的三个成矿系列的不同矿床.往往共同叠加在同一容矿断裂构造中.形成一种多时代、多来源、多成因的复合矿床。
Comprehensive study on the geological features of sphalerite vein and galena vein,characteristic elements of monominerals and traces of stable isotopes from Laochang Pb-Zn mineral deposit shows that the sphalerite vein is different from galena vein in the derivation of ore-forming material and genesis. The different mineralization types between basement and cover,the ore-hosted structures in basement covered by sedimentary cover,the time of granites,the uncomformity of basement with the cover,and the Pb palaeo-secondary halo merely existed in the cover,reveal that the metallogenetic time of the deposit in basement and the deposit in the cover is also different. The Laochang Pb-Zn mineral deposit consists of sedimentary - altered type sphalerite deposit series and magmatic hy-drothermal type galena deposit series in Calidonian Time and sedimentary-altered type (Pb)Zn deposit series in Variscan Time. The above three deposit series were superimposed in the same ore -hosted fault,and constituted a kind of complex deposit with multiple times,resources and geneses.
