都龙矿区曼家寨矿段原生晕分带特征及深部找矿潜力评价

都龙矿区为滇东南多金属成矿系统(个旧—薄竹山—老君山)的重要组成部分。为评价曼家寨矿段深部找矿潜力,对其进行了原生晕分带的系统研究。研究表明:原生晕形态特征显示,前缘晕为Cd、As,近矿晕为Pb、Ag,尾晕为W、Mo;由格里戈良法获得轴向分带序列由浅至深为BiAs-Cu-Cd-Ag-Sb-W-Mo-Pb-Zn-Hg;根据原生晕轴向分带以及w(As)/w(Mo)、w(Cd×As)/w(W×Mo)等勘查评价指标由降转升的变化趋势,建立了原生晕叠加找矿模型。结合曼家寨矿段因子得分异常、主量元素找矿标志w(Fe+Na)等值线分布趋势,综合认为深部仍有良好的找矿前景。上述认识已得到探矿工程验证。

Characteristics of primary geochemical halos and deep prospecting potential evaluation, in Manjiazhai ore block of Dulong mining area

Located in southeastern of Yunnan Province,the Dulong mine is an important component of Southeast Yunnan polymetallic mineralization system(Gejiu-Bozhushan-laojunshan).In order to evaluate the deep potential,zoning of the primary halos was systematically studied and the results show that the primary halo is characterized by the front halo elements of Cd,As,the near-ore halo elements of Pb,Ag and the rear halo elements of W,Mo;the axial zoning sequence calculated by the Gregorian's method is Bi-As-Cu-Cd-Ag-Sb-W-Mo-Pb-Zn-Hg from shallow to deep.According to the variation tendency from fall to rise of the prospecting index of the axial zoning sequence and w(As)/w(Mo),w(Cd× As)/w(W× Mo)the primary halos superimposed prospecting model is established.Based on abnormal factor score and principal ore element prospecting mark,the contour distribution trend of w(Fe+Na) in Manjiazhai ore block we believe that here is still potential and workings have proved the potentiality.