【摘要】 根据博罗科怒成矿带东段约660km2内2269个水系沉积物样品的11项元素分析数据的因子分析,F1因子为研究区的主要成矿或示矿元素Ag、Pb、Zn、Cu、Bi、Sn组合,体现了主要的成矿作用和过程中的信息,F2因子为Sb、As低温活泼元素组合,F3因子为W、Mo高温元素组合。各因子浓度-面积(C-A)多重分形模型拟合直线一般为四段式,根据其拐点划分出地球化学背景、区域异常、局部异常和高异常区,其局部异常可以反映不同的成矿地质条件,基于F1主成矿因子的分形异常圈定出莱历斯高尔和可克萨拉2个主要的预测靶区。各预测靶区与区内已发现矿床的分布基本吻合,揭示因子分析各主要因子的分形异常在多元素综合地球化学异常找矿中具有良好的指示意义,为地球化学找矿提供了良好的方法手段。更多还原

【Abstract】 According to the factor analysis of geochemical data of 11 elements for 2269 whole stream sediment samples collected from a region of about 660 km2 in the eastern section of the Boluokenu metallogenic belt, the factor F1 is the main metallogenic or ore-indicating element association of Ag, Pb, Zn, Cu, Bi, and Sn in the study area, showing the information of main mineralization process, the factor F2 is the low-temperature active element association of Sb and As,and the F3 is the high-temperature element association of W and Mo. A method based on the concentration-area(C-A)multifractal model has been applied to analyze these three factors. The C-A multifractal curves on double logarithmic diagrams can be approximately fitted by four straight lines with three turning points which can be used as thresholds to distinguish the geochemical background, regional anomaly,local anomaly, and high anomaly, respectively. The local anomalies can reflect different metallogenic geological conditions. 2 main predicted prospecting targets of the Lailisigaoer and Kekesala have been outlined based on fractal anomalies obtained by analyzing the F1 main ore-forming factor. The known deposits and mineral occurrences are basically in accordance with the outlined targets. This shows that fractal anomalies of the main factors obtained by the factor analysis have a good indicative significance for predicting exploration target by using the synthetic multi-element geochemical anomaly, and provide a useful method for geochemical prospecting.更多还原