贵州都匀市牛角塘矿田大亮锌矿床找矿突破与指示意义

Exploration breakthrough and prospecting significance of Daliang zinc deposit in Niujiaotang ore field,Duyun City of Guizhou

大亮锌矿床位于湘西—黔东铅锌成矿带南端,为贵州省都匀市牛角塘锌矿田一部分。前期调查研究主要聚焦于矿田产状平缓地层区和马坡矿区,然而大亮锌矿床的产状陡倾斜地层区的资源潜力及找矿远景仍不明朗。综合该矿床地质特征,成矿流体、成矿环境和成矿作用等方面的研究成果,以及与成矿带同类矿床对比研究,认为大亮锌矿床成因类型类似MVT型铅锌矿床,具有层控—相控—岩控的特点,寒武系第二统清虚洞组是区内重要的找矿线索。利用上述理论研究成果指导大亮锌矿区“陡倾斜带”的勘探工作,在“陡倾斜带”找矿靶区发现并圈定四个主要矿体,新增(333+334)锌金属资源储量约12.5万吨,达到中型铅锌矿床规模,为牛角塘锌矿田内取得的重要找矿突破成果。该找矿成果进一步证实了前期地质找矿理论认识,同时在大亮矿区F_(2)断层南东盘深部得到钻探工程验证,指示其深部找矿前景依然良好。

Daliang Zn deposit is located at the south of West Hunan-East Guizhou Pb-Zn metallogenic belt,which is one part of Niujiaotang Pb-Zn ore field in Duyun City of Guizhou Province.Previous exploration and study has mainly focused on the gentle-dip stratigraphic area and Mapo mining area in the Niujiaotang ore field,however,the resource potential and exploration prospect of the"steep dip zone"in Daliang mining area are still mysterious.Based on the geological characteristics of the deposit,the ore-forming fluids,ore-forming environment,and ore-forming processes,as well as the comparaison with other similar deposits in the matallogenic belt,it is considered that the genetic type of Daliang zinc deposit is similar to that of MVT type lead-zinc deposit,with the characteristics of layer control,facies control,and rock control.Qingxudong Formation of the Cambrian second series is an important prospecting clue in the area.The above theoretical research result is used to guide the exploration work in the"steep dip zone".Four main orebodies have been outlined in the"steep dip zone",and the newly increased(333+334)Zn metal resources reserve is more than 125000 tons,reaching a medium scale,which is an important exploration breakthrough in the area.This exploration achievement further confirms the theoretical understanding of geological exploration in the early stage,and has been verified by drilling hole engineering in the SE wallpart of F_(2) thrust fault in the Daliang mining area.It is indicated that there is still a good exploration prospect in the deep area.