湖南禾库地区铅锌矿地质特征和成矿规律研究

Study on Geological Characteristics and Metallogenic Regularity of Pb-Zn Deposits in Heku Area, Hunan Province

禾库地区位于湘西花垣铅锌矿田外围西南侧,铅锌均赋存于寒武系清虚洞组地层中,以研究区中部的麻栗场断裂为界,西侧矿化产于清虚洞组中段的藻灰岩和上段的砂屑灰岩中,东侧矿化主要产于清虚洞组上段的白云岩中。区内矿体以透镜状为主,顺层分布,连续性较差。西侧矿化以闪锌矿为主,东侧矿化以方铅矿为主。围岩蚀变包括方解石化、硅化、白云石化等。通过与鄂西–湘西–黔东地区同类型铅锌矿对比,认为研究区矿化形成于加里东期。主要控矿因素为北东向断裂构造,次为清虚洞组地层层间破碎带。

Heku area is located in the southwest of the Huayuan Pb-Zn orefield in Western Hunan Province. The main ore-bearing stratum is the lower Cambrian Qingxudong Formation. In the study area, the mineralization in the west of Malichang fault occurs in algal limestone of the middle Qingxudong formation and the sandstone limestone of the upper Qingxudong formation, while the mineralization in the East mainly occurs in dolomite of the upper Qingxudong formation. The ore bodies in the area are mainly lenticular in shape and distributed along the bed with poor continuity. Mineralization is mainly zinc in the West and galena in the East. Wall rock alteration includes calcilization, silicification and dolomitization. Compared with the lead-zinc deposits of the same type in western Hubei-western Hunan-eastern Guizhou, the mineralization in the study area was formed in Caledonian. The main ore controlling factors are NE trending fault structures, followed by interlayer fracture zones of the Qingxudong formation.