浅覆盖区1∶5万浅钻地球化学测量采样密度探讨——以安徽凤阳大王府—江山铅锌金矿为例

Discussion on sampling density of 1∶50000 short-hole drilling geochemical survey in shallow covered region:A case study of Dawangfu-Jiangshan Pb-Zn-Au deposit in Fengyang,Anhui Province

以安徽凤阳大王府—江山铅锌金矿为例,通过开展系统的浅钻地球化学测量试验研究,进一步探讨浅覆盖区浅钻地球化学测量最佳采样密度。实际采样平均密度为16孔/km2,均匀抽稀成8孔/km2、4孔/km2、2孔/km2分别绘制单元素地球化学异常图,经过对比研究,发现1∶5万浅钻地球化学测量适宜的采样密度为4孔/km2,均匀布孔,能够反映类似大王府—江山铅锌金矿中型矿床类型的特征。

Taking the Dawangfu-Jiangshan Pb-Zn-Au deposit in Fengyang,Anhui Province as an example,the optimal sampling density of short-hole drilling geochemical survey in shallow covered region is further discussed through the systematic 1∶50000 short-hole drilling geochemical survey.The average density of actual sampling is 16 holes/km2,which is evenly diluted into 8 holes/km2,4 holes/km2 and 2 holes/km2,and the single element geochemical anomaly maps are drawn respectively.Through comparative study,it is found that the suitable sampling density is 4 holes/km2 in the stage of 1∶50000 short-hole drilling geochemical survey,which can reflect the characteristics of medium-sized deposits similar to Dawangfu-Jiangshan Pb-Zn-Au deposit.