Northeast Yunnan Lead-zinc Ore-controlling Structure Characteristics And Metallogenic Prediction

Lead-zinc mine area in northeastern Yunnan Province is located in the southwestern margin of the Yangtze platform, it is in the triangle formed by Xiaojiang fracture, Yadu-Ziyun fracture and Shizong-Mile fracture.It is one of important places producing lead and zinc in our country. In the study area, tectonic is development,zonal distribution, the characteristics of it is multi-period and multi-stage activities. lead-zinc deposits, points, mineral points are widely distributed, consistent with the distribution structure.They are of unique geological conditions.Lead-zinc mines in northeastern Yunnan Province are controlled by lots of factors such as stratum and ore-controlling structures, and the control of ore-controlling structures was the most obvious. This thesis combined with a series of projects of lead-zinc mineralization in northeast Yunnan signed by the tutor,and through geological data, detailed field geological survey and remote sensing collected by the previous,Described characteristics of ore-controlling structural control from the relationship among distribution of ore-controlling structural features, and the relationship between ore-controlling structures and lead and zinc mineralization.Through detailed geological research,the ethis analyzed distribution of ore-controlling structure in northeasten area, formulated the connection of regional ore-controlling structure, the controlling structures in the northeast, layer fault and feather fracture in the northwest, and identified the relationship among controlling structures and lead-zinc mine.Then summarized ore-controlling control law and pattern. Regional Xiaojiang fracture zone and Zhaotong-Qujing concealed fracture zone provided a favorable geological setting for ore-forming fluids.Pressure-shear fracture in the northeast provided a channel for ore-forming fluids penetration, interlayer fracture zone in the northeast, anticline and some feather fracture provided space for the formulation of ore bodies. Summed up ore-controlling structures control types. In the process lead-zinc mineralization.According to the law of ore-controlling structural control, combined with the typical ore-controlling structure analysis,field research results, remote sensing, geophysical and geochemical data of ore deposit.Predicted threeⅠ-level target, threeⅡ-level target in the study area.Through engineering verification of threeⅠ-level target, obtained scales of lead-zinc ore body and better mineralization information, proved the high reliability of this prediction.It has some theoretical and practical significance.