黔西北亮岩铅锌矿床地质特征及找矿方向

Geological Characteristics and Prospecting Direction of Liangyan Lead-Zinc Deposit in Northwest Guizhou

黔西北赫章亮岩Pb-Zn矿床位于川滇黔Pb-Zn成矿带,勘查表明该矿床具有中型以上找矿潜力.本文对亮岩铅锌矿床的地质特征、围岩蚀变特征进行了深入分析.矿区坑道编录及室内研究表明:1石炭统黄龙组(C2h)为矿区赋矿层位,矿体赋存于白云岩与白云质灰岩接触界线的角砾岩化带,具有明显的MVT型矿床特点;2从矿体中心向外,蚀变由方解石化过渡为白云石化;3北北西向断层与地层复合控矿特征明显.上述认识可为本区矿床成因机制研究及勘查找矿工作提供理论依据,为黔西北铅锌成矿区成矿体系研究提供补充.

The Liangyan Pb-Zn deposit is a more than medium scale deposit explorated recently in the Guizhou-Yunnan -Sichuan lead-zinc metallogenic domain,and still has much more mineral potential. Liangyan Pb-Zn deposit geological characteristics and wall-rock alteration characteristics are discussed in path. Mine opening geological record compiling and laboratory studies showed as follows. 1)The ore bodies occurred in dolomitic limestone and dolomite suffering intense dolomitization within middle Carboniferous Huanglong(C2h)Formation,and it showed obvious mineralization features of MVT;2)The alternation zoning from the center of ore bodies outwards is calcitization→dolomitization;3)Compound ore controlling characteristics of NNW fault and formation is obvious. All understandings above can provide theoretical basis for exploration,prospecting and research on metallogenic mechanism in this district,also provide supplementary for research on mineralization system of lead-zinc deposits in Northwest Guizhou.