安徽省宁国大龙地区土壤地球化学特征及找矿效果

Soil geochemical characteristics and the prospecting effect of Dalong area in Ningguo City of Anhui Province

大龙地区位于皖浙两省交界地带,地形条件恶劣,始终未开展过系统的地质调查工作,找矿工作没有取得重大进展。通过在研究区开展1∶1万土壤地球化学测量工作,运用元素的变异系数、富集系数、富集离散特征等理论和相关技术方法,对大龙地区土壤中12种微量元素的测量结果进行地球化学统计分析,显示Ag、W、Mo、Bi、Zn共5种元素具有较大的成矿潜力。利用数理统计方法,对12种元素进行了R型因子等相关分析,划分出了Mo-Ag-Cu-As-Sb-Hg、W-Bi、Pb-Zn共3组主成矿元素组合。研究区共圈出土壤单元素异常158个、综合异常18个,划分了6个综合异常带,对成矿条件好的5个综合异常带采用槽探、钻探等手段进行了工程验证,发现并圈定了钨、钼、铅锌矿(化)体15条,取得了很好的找矿效果。

Dalong area is located at the junction of Anhui and Zhejiang Province,with poor terrain condition.Systematic geological survey has never been carried out in this area and significant progress has not been achieved in the prospecting work.Through the 1∶10000 soil geochemical soil survey in the study area,the authors in this paper have adopted the theories and methods of the coefficient of variation,enrichment coefficient and enrichment discrete characteristics to analyze geochemistry statistics of twelve kinds of trace elements,and the results show that five elements of Ag,W,Mo,Bi and Zn have great metallogenic potential.Twelve kinds of trace elements have been analyzed with correlation and R-factor analysis and three sets of main mineralization element combinations were classified,which were Pb-Zn,W-Bi and Mo-Ag-Cu-As-Sb-Hg.A hundred and fifty-eight single element anomalies and eighteen comprehensive anomalies were identified in the study area.Besides,Six comprehensive anomaly zones were identified.Five integrated anomaly zones with good metallogenic conditions were tested through trenching and drilling methods to define 15 tungsten,molybdenum and lead zinc-ore bodies,which indicated good prospecting result.