江西省冷水坑斑岩型矿床控矿地质体三维地质特征

Three-Dimensional Geological Characteristics of Ore-Controlling Geological Body of Lengshuikeng Porphyry Deposit in Jiangxi Province

江西省冷水坑银铅锌矿田处于扬子地块与华夏地块拼接带南侧,武夷银多金属成矿带和钦杭成矿带的交汇部位,为我国重要的银铅锌矿田。本文基于矿田地质图、勘探线剖面图和钻孔柱状图等地质资料,运用GOCAD软件,建立了矿田斑岩体、断裂和矿体的三维模型以及矿体的品位模型,直观地展示了各成矿地质体相互关系。上述模型表明斑岩型矿体主要产出于花岗斑岩的前缘带和主体带;Ag品位分布具有空间差异性,高品位值主要分布在矿体的上部,Pb和Zn的品位分布相对均一;矿体主要产于断裂F1和F2之间,且矿体和花岗斑岩体产状均明显受断裂控制。冷水坑银铅锌矿田成矿地质体三维模型的建立为后期矿田深边部找矿提供了重要的技术支撑,尤其对其外围及深部隐伏斑岩型矿体的寻找具有一定的指导意义。

The Lengshuikeng silver-lead-zinc ore field in Jiangxi Province is located on the southern side of the suture zone of the Yangtze block and the Cathaysian block,and the intersection of the Wuyi silver polymetallic metallogenic belt and the Qinhang metallogenic belt.It is an important silver-lead-zinc ore field in China.Based on the geological data of ore field geological map,exploration line profile and borehole histogram,using GOCAD software,the three-dimensional model of porphyry body,fracture and ore body,as well as the grade model of ore body have been established,which provides a visual representation of the relationship between ore-forming geological bodies.This model further confirmed that the porphyry ore body is produced in the front and main zones of the granite porphyry,and is controlled by the regional nappe structure.The silver grade distribution is spatially variable,with high-grade ores mainly distributed in the upper part of the ore body,and the grade distribution of lead and zinc is relatively uniform;the ore body is mostly produced between F1 and F2,and both the ore body and the granite porphyry body are controlled by fractures.The establishment of the 3D model of the Lengshuikeng silver-lead-zinc ore field provides important technical support for future prospecting of the deep edge of the ore field,especially for the exploration of the peripheral and deep concealed porphyry ore bodies.