新旧水系沉积物测量规范应用对比——以长兴林场工作区为例

Comparison of application of new and old stream sediment survey specifications:taking Changxing forest farm as an example

为了更好地取得找矿效果,对和龙长兴林场工作区采取了-2 mm(10目)、+0.25 mm(60目)~-2 mm(10目)两个粒级的水系沉积物。测试结果表明,-2 mm与+0.25 mm~-2 mm水系沉积物相比,Sb、Co、Ni、Cu、Zn、Mo元素明显偏高,Ag元素明显偏低,Au、Cr、Pb元素基本不变;聚类分析,若以相关系数r=0.6划分,-2 mm水系沉积物测试结果可分为Au、Ag+Sb+Co+Ni+Cu+Mo+Cr+Pb、Zn三群,+0.25~-2 mm水系沉积物测试结果可分为Au+Co+Sb+Mo、Ag+Cu、Ni+Cr+Pb+Zn三群。结合区内成矿地质条件分析认为,+0.25~-2 mm水系沉积物测试结果更符合工作区矿化蚀变情况,对找矿指导意义较大。

In order to obtain better prospecting effect,two grain sizes of stream sediments≤2 mm(10 mesh);≥0.25 mm(60 mesh)to≤2 mm(10 mesh)were taken in the working area of Changxing forest farm in Helong.The test results show that the Sb,Co,Ni,Cu,Zn,Mo are obviously higher than those with grade,the Ag elements is obviously lower,while the Au,Cr,Pb elements are basically unchanged in stream sediments of≤2 mm than those of≥0.25 mm to≤2 mm.According to cluster analysis,if the correlation coefficient r=0.6,the test results of stream sediments with grade≤2 mm can be divided into three groups:Au,Ag+Sb+Co+Ni+Cu+Mo+Cr+Pb and Zn.The stream sediments test results of≥0.25 mm to≤2 mm can be divided into three groups:Au+Co+Sb+Mo,Ag+Cu,and Ni+Cr+Pb+Zn.Combined with the analysis of metallogenic geological conditions in the working area,it is concluded that the test results of stream sediments with graderanging from≥0.25 mm to≤2 mm are more consistent with the mineralization and alteration in the working area,which has great guiding significance for ore prospecting.