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湖南西北部龙山铅锌矿带的岩溶菱锌矿体,主要赋有于上寒武统耗子沱群第三段(∈,hZ~3)和下奥陶统南津关组底部(O_1n~1)的含矿硅质岩与纯灰岩接触面附近。矿体呈似层状、透镜状位于古岩溶面上和溶洞内。矿物成分以菱锌矿为主,次为异极矿。矿石具典型表生环境下的结构构造。 该区古生代含矿碳酸盐岩平均含Pb、Zn量,比碳酸盐岩丰度值分别高12.1倍和7.8倍。在湿热气候条件下,岩溶作用过程中,含矿岩石分解迁移,Pb、Zn成矿物质汇集在岩溶空间富集成矿。
The karst rhombohedral zinc ore body of the Longshan Pb-Zn ore belt in northwestern Hunan is mainly distributed in the third member of the Upper Cambrian Conson Tuo Group (∈, hZ ~ 3) and the bottom of the Lower Ordovician Nanjinuan Formation (O_1n ~ 1) Ore-bearing silicalite and pure limestone near the contact surface. Ore body is like a layer, the lens is located in the ancient karst surface and cave. The main mineral composition to calamine, secondary to hemipolar mineral. Ore with a typical epigenetic structure of the structure of the environment. The Paleozoic ore-bearing carbonate rocks in this area contain Pb and Zn on average, which are 12.1 times and 7.8 times higher than those of carbonate rocks, respectively. In wet and hot weather, during the process of karstification, the ore-bearing rocks decompose and migrate, and the Pb and Zn ore-forming materials pool in the karst space to enrich the mineralization.