Retrieval of Clay Minerals from Hyperion Data in Dexing Mine, Jiangxi Province and Its Prospecting Significance
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摘要: 江西德兴矿区为我国重要的矿产资源基地, 目前面临资源枯竭的困境, 寻找替代的新矿产迫在眉睫.根据研究区野外土壤实测样品分析, 利用连续统去除的方法提取土壤实测光谱的特征吸收位置, 从而建立粘土矿物含量为因变量的预测方程.检验得知, 高岭石相关系数R为0.811, 拟合系数R2达到0.658, F值为5.275, Sig值为0.047 7, 其小于0.05;绿泥石相关系数R为0.893, 拟合系数R2达到0.797, F值为1.602, Sig值为0.016 6, 其小于0.05;伊利石相关系数R为0.783, 拟合系数R2达到0.619, F值为5.57, 对应的Sig值是0.075 4, 其大于0.05, 说明自变量与因变量之间具有高度相关性, 反演精度较好.从反演结果可知, 研究区的高岭石整体含量较高, 整体上粘土矿物高岭石、绿泥石和伊利石在1号坝、2号坝、4号坝和铜矿区含量较低.由于粘土矿物不断地经过地球化学变化、累积, 产生黄铁矿、黄铜矿及赤铁矿, 所以挑选粘土矿物富集并且地质构造活跃的区域为铁矿石及铜矿石预测区.结合研究区地质解译图与粘土矿物反演结果, 在采矿场与IV号尾矿坝向NE方向沿线上圈定两个遥感找矿有利区.Abstract: Dexing mine is significant in China, but its resources is endangered with exhaustion, which means it is important to tap the alternative mines. A prediction equation is established in this study by deriving the absorption position of the spectrum in the measured soil data by continuum removal and analyzing the reflectivity of these positions responding to specific clay minerals, using the three clay mineral contents as the dependent variables. It is found that kaolinite retrival correlation coefficient R is 0.811, fitting coefficient R2 is 0.658, F is 5.275, Sig is 0.047 7 < 0.05; chlorite retrival correlation coefficient R is 0.893, fitting coefficient R2 is 0.797, F is 1.602, Sig is 0.016 6 < 0.05; ilitte retrival correlation coefficient R is 0.783, fitting coefficient R2 is 0.619, F is 5.57, Sig is 0.075 4 > 0.05. The testing indicates the independent variable well correlated to the dependent variable, and the inversion accuracy is high. The results indicate that the ensemble content of kaolinite is higher and distributed more widely, compared with chlorite and illite. Overall, the contents of three clay minerals at tailings dam, Ⅱ tailings dam, Ⅳ tailings dam and copper mine are relatively low. The clay mineral accumulated to pyrite, chalcopyrite and hematite by geochemical changes. The resources prediction area is selected, which have high clay minerals and activity geological structure, located on the northeast of IV tailings dam.
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Key words:
- hyper-spectral /
- remote sensing /
- clay mineral /
- soil /
- prospect
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图 5 高岭石含量实测值与预测值相关性散点(a)和高岭石含量实测值与预测值对比折线(b)
Fig. 5. The relationship scatter diagram of measured and prospected kaolinit contents (a) and the comparison of measured and prospected kaolinit contents (b)
图 6 绿泥石含量实测值与预测值相关性散点(a)和绿泥石含量实测值与预测值对比折线(b)
Fig. 6. The relationship scatter diagram of measured and prospected chlorite contents (a) and the comparison of measured and prospected chlorite contents (b)
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