收稿日期: 2021-06-10
修回日期: 2021-12-02
网络出版日期: 2022-06-17
基金资助
曹家洼金矿股份有限公司与昆明理工大学校企合作项目“招远市曹家洼金矿石头顶矿段土壤地球化学分析及找矿预测”(619320200073)
Soil Geochemical Characteristics and Prospecting Prediction of Shitouding Ore Section of Caojiawa Gold Deposit in Shandong Province
Received date: 2021-06-10
Revised date: 2021-12-02
Online published: 2022-06-17
曹家洼金矿石头顶矿段地处胶西北金矿集区招平断裂下盘,矿段内黄铁绢英岩—绢英岩化蚀变强烈。通过开展1∶1万土壤地球化学测量,在曹家洼金矿石头顶矿段共圈定出41个单元素异常和12个组合元素异常。综合成矿地质条件、矿化蚀变特征和物探结果,对土壤化探数据信息进行挖掘,绘制了因子组合异常图,划分出4个有利成矿区(靶区编号为H1~H4)。其中,H4和H2靶区的金变异系数为0.98,异常平均值高达4.9×10-9~5.3×10-9,具有较好的找矿潜力。目前,曹家洼矿区在H4靶区0号线施工钻孔,于ZK1钻孔154 m处揭露矿体,验证了靶区的找矿潜力。研究表明:Au-Ag-Hg为矿致异常,异常走向与招平断裂一致,矿体严格受构造控制,该矿区内Hg和Ag元素可作为指示性元素,为找矿提供重要依据。
何金霖 , 李俊 , 许慧玲 , 曹李慧 , 孙德华 . 山东曹家洼金矿石头顶矿段土壤地球化学特征及找矿预测[J]. 黄金科学技术, 2022 , 30(2) : 179 -195 . DOI: 10.11872/j.issn.1005-2518.2022.02.075
Shitouding ore section of Caojiawa gold deposit is located at the footwall of Zhaoping fault belt in the northwestern Jiaodong gold concentration area.Field exploration and drilling found that this section has strong pyritic sericite alteration,which is the main symbol of ore-forming surrounding rocks in this area.It has good metallogenic prospects,but no breakthrough has been made in prospecting work.After carrying out 1∶10 000 soil geochemical survey,we used correlation analysis and R-type cluster analysis and other methods to study the distribution characteristics of element anomalies in the working area from the perspective of geostatistics.With previous geological data and current exploration situation,the anomalies were delineated and four target areas of H1~H4 were divided,all of which had good metallogenic prospects.Regarding the geochemical prediction and geophysical results,it is found that the variation coefficient of gold in H4 and H2 target areas was 0.976,and the average anomaly value was 4.9×10-9~5.3×10-9,which was consistent with the geophysical results.It is speculated that the anomaly is caused by ore.
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