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东天山成矿带是我国重要的铜金矿集区之一.复杂的地质演化历史导致了成矿地质背景的复杂性、成矿作用的多期性和多样性.本文分别应用地质统计学和多重分形滤波法(S-A法)对Cu、Au含量数据进行分析,获取了不同层次的致矿异常信息.结果表明:(1)东天山地区Cu、Au含量最大变程分别为80km和47km,最大变程方向与深大断裂走向一致,表明Cu、Au异常受深大断裂控制;Cu含量分布比Au具有更好的连续性,Cu的含量变化表现出较强的结构性特征,而Au的含量变化表现出更强的随机性特征.(2)泛克立格法和多重滤波分形分析中的低通滤波获取致矿异常信息具有相似性,均反映Cu、Au区域上的分布趋势和浓集特征.(3)多重分形滤波法能够提取不同层次的致矿异常信息,包括区域异常信息和局部异常信息,S-A法揭示的局部Cu异常突出了某些低背景中的隐蔽异常;而呈北东向串珠状分布的局部Au异常,可能暗示区内NE向次级断裂系统控制了金矿床的发育.
The East Tianshan metallogenic belt is one of the important copper-gold mineralized areas in China.The complicated geological evolution history has led to the complexity of metallogenic geological background, the multi-period and diversity of mineralization.In this paper, Multi-fractal filter method (SA method) was used to analyze the Cu and Au content data and obtain the ore-forming anomaly information at different levels.The results showed that: (1) The maximum range of Cu and Au in the East Tianshan Mountains was 80km and 47km respectively, The direction of the variation is consistent with that of the deep fault, indicating that the anomalies of Cu and Au are controlled by the deep faults. The distribution of Cu content has a better continuity than that of Au, and the content of Cu shows strong structural features. The content of Au (2) The results of low-pass filtering obtained by the method of pan-kriging and multi-filter fractal analysis are similar to mine-induced anomaly information, both reflect the distribution trend and concentration in Cu and Au regions (3) Multifractal filtering method can extract different levels of ore-forming anomaly information, including regional anomaly information and local anomaly information. The local Cu anomaly revealed by SA method highlights some hidden anomalies in low background. Beaded The local Au anomaly may indicate that the NE-trending secondary fault system controls the gold deposit development.