山西胡家峪南和沟铜矿床深部矿体定位预测的原生晕指示

Prediction of Blind Ore Body Based on Primary Halo of Nanhegou Copper Deposit,Hujiayu,South Shanxi,China

系统研究了山西胡家峪南和沟铜矿床深部矿体的原生晕特征。结果表明，矿区深部340～240m中段矿体原生晕的轴向分带序列为（Mn-W—Sn—Ti—Ag）-（Ni—Co—Mo—Pb—Sb—Zn）-（Hg—As—B-Bi—Cu—Au—V），呈现“反分带”特征；地球化学参数口曲线在340～240m中段的变化趋势为“降→升”；原生晕叠加结构显示在3号矿体尾部（290～240m中段）出现前、尾晕共存。这些现象都反映在240m中段以下可能存在隐伏矿体。同时，在侧向上，340～240m中段主成矿元素Cu质量分数由NE向SW方向显著增加，且在240m中段出现明显Cu异常，推测隐伏矿体分布在已知矿体的SW侧。综合原生晕特征可以推断，在240m中段92穿脉，3号矿体SW侧应有隐伏的新矿体发育。依据上述认识圈定出了深部矿体的预测靶区。

Ore body 3^# , the largest body in the Nanhegou copper deposit , is pipe-shaped, and occurs nearly upright. Primary halo investigation reveals Mn, W, Sn, Ti, and Ag were concentrated within its halo at 340 meters altitude, and Ni-Co-Mo-Pb-Sb-Zn and Hg-As-B-Bi-Cu-Au-V are enriched at 290-meter and 240- meter level respectively, thus indicating a reverse geochemical zonation. At 240-meter and 290-meter level, proximal and front elements are enriched together, implying the presence of a blind ore body below the 240-meter level. At the bottom （240 and 290-meter level） ,however, copper concentration increased gradually southwestward, indicating that the deep-seated ore body was located in the southwest of ore body 3^# . This conjecture was validated by subsequent drilling works.