湖南省临武县阳鼓矿区铅锌锡矿地质特征及找矿前景分析

Geological characteristics and prospecting prospects analysis of lead zinc tin deposits in Yanggu mining area,Linwu County,Hunan Province

阳鼓矿区位于南岭东西向构造带中段北缘,耒阳-临武南北向构造带南端,湖南香花岭矿田北侧,周边围绕香花岭矿田发育有多个不同成因类型的锡铅锌等多金属矿,岩体内部的花岗岩型钽铌、细晶岩脉型钽铌、斑岩脉型锡铅锌银矿,与围岩接触带条纹岩铍、矽卡岩型锡多金属矿、交代型白钨矿和地层围岩中热液裂隙充填交代型矿床(锡铅锌矿、黑钨矿)、本矿区主要富矿层位为泥盆系跳马涧组的砂岩、砾岩,但寒武系地层及岩体均未出露地表,以往工作对其控制和研究程度偏低,结合成矿部位主要位于层内裂隙、主断裂与次级断裂交汇部位的特点。通过此次开发利用方案编制及此前的储量核实资料,再结合区域地质背景和矿床地质特征及前人的研究基础上,得出该矿区矿床类型为断裂控制的高中温热液充填交代型的Sn、W、Pb、Zn、Ag矿床型矿床。并根据断裂控矿的特点,圈定下一阶段找矿靶区,并探讨其他成因类型的多金属矿的成矿可能。

Yanggu mining area is located at the north edge of the middle section of the east-west structural belt of the Nanling Mountain,the south end of the south-north structural belt of Leiyang Linwu,and the north side of the Xianghualing ore field in Hunan.Around the Xianghualing ore field,there are many different genetic types of tin lead zinc and other polymetallic ores,granite type tantalum niobium,fine-grained vein type tantalum niobium,porphyry vein type tin lead zinc silver deposits in the rock mass,striped beryllium,skarn type tin polymetallic ore,metasomatic scheelite,and hydrothermal fissure filling metasomatic deposits(tin lead zinc ore,wolframite)in the surrounding rock mass,and the main rich ore horizons of the mining area are Sandstone and conglomerate of Tiaomajian Formation of Devonian System,but Cambrian stratum and rock mass are not exposed to the surface,and the control and research degree of previous work is low.In combination with the characteristics that the metallogenic part is mainly located in the interlayer fissure,the intersection of main fault and secondary fault.Based on the preparation of this development and utilization plan and previous reserve verification data,combined with the regional geological background and geological characteristics of the deposit,as well as previous research,it is determined that the deposit type in the mining area is Sn controlled by faults and filled with high and medium temperature hydrothermal fluids W.Pb,Zn,Ag deposit types.Based on the characteristics of fault controlled mineralization,delineate the next stage of prospecting target areas,and explore the possibility of mineralization for other types of polymetallic deposits.