老挝铜矿综合找矿标志和找矿方向的判断方法

Comprehensive Prospecting Signs and Judgment Method of Prospecting Direction for Copper Deposits in Laos

南亚植被覆盖强,给找矿工作带来较大难度。为改进找矿技术方法,提高找矿效率,通过分析老挝纳勐铜矿床地质特征,提出了成矿信息三维空间分析法作为铜矿综合找矿标志及方向的判断方法。采用形态滤波变换法处理了主要铜矿地质体,结合全局集合运算的方式,计算了原始铜矿地质体和综合找矿趋势形态;基于欧式距离变换,定量提取主要铜矿地质体的起伏程度,分析了成矿信息三维空间;通过计算参考光谱与像元光谱之间的矢量夹角,分解了像元光谱曲线,提取了综合找矿标志信息。依据主干断裂分布区域的划分,计算了构造等密度;通过提取找矿标志的主干构造和局部构造,计算了构造优益度,确定了综合找矿标志及方向。试验结果表明,该方法具有更高的拟合程度和动态度。

South Asia has strong vegetation coverage,which brings greater difficulty to prospecting.In order to improve the prospecting technology and the efficiency of prospecting,the three-dimensional spatial analysis method of metallogenic information was proposed as a method for judging the comprehen⁃sive prospecting indicator and direction of copper deposits by analyzing the geological characteristics of the Nameng copper deposit in Laos.The morphological filtering transformation method is used to process the main copper ore geological bodies,combined with the global set operation method,the original copper ore geological bodies and the comprehensive prospecting trend shape are calculated.Based on the Euclidean distance transformation,the undulation degree of the main copper ore geological bodies is quantitatively ex⁃tracted,and the three-dimensional space of mineralization information is analyzed.By calculating the vec⁃tor angle between the reference spectrum and the pixel spectrum,the pixel spectrum curve is decomposed,and the comprehensive prospecting sign information is extracted.According to the division of the distribu⁃tion area of the main faults,the structural isodensity is calculated.By extracting the main structure and lo⁃cal structure of the prospecting indicator,the structural superiority is calculated,and the comprehensive prospecting indicator and direction are determined.The experimental results show that the method has high⁃er fitting degree and dynamic degree.