苏北超高压变质带双湖石墨矿激电测量应用效果

Application of induced polarization to exploration of Shuanghu graphite deposit in the UHP metamorphic belt in northern Jiangsu Province

为了在苏北地区取得石墨矿找矿新突破,在双湖地区开展了激电找矿工作及方法有效性探讨。双湖石墨矿化体赋存于东海岩群斜长角闪岩大理岩组内,区内含石墨岩石相对于围岩具有明显的低电阻率、高极化率特征,具备开展激电测量的物性前提。通过对该石墨矿区进行激电测量工作,获取了石墨矿石的电性参数,圈定了4处激电异常。对重点异常进行激电测深评价、槽探及钻探验证,石墨矿化体与激电异常吻合度高,见矿情况良好,表明激电方法在苏北超高压变质带寻找石墨矿较为有效,苏北地区尚有10余处石墨矿(化)点,成矿前景不明,应用该方法可初步了解苏北地区石墨矿找矿潜力。

In order to make a breakthrough in graphite prospecting in northern Jiangsu,this study explores the effectiveness of applying induced polarization(IP)prospecting methods in Shuanghu area.The Shuanghu graphite mineralization occurs in the amphibolite-marble formation of the Donghai Rock Group.Graphite-bearing rocks show obviously lower resistance and higher polarization relative to their surrounding rocks,and possess the physical properties required for IP measurement.Electrical parameters of graphite ores and 4 IP anomalies have been delineated by conducting IP measurements in Shuanghu graphite deposit,northern Jiangsu Province.Verified by IP sounding,trenching and drilling exploration,the key anomalies are in good correspondence to graphite ore bodies with remarkable geological guidance.Considering over 10 graphite deposits to be explored in the study area,the effective IP survey should be widely applied in searching for graphite ores in northern Jiangsu Province.