青海阿尔茨托山地区地球化学(异常)场的多重分形研究

Multifractal study of geochemical (anomaly) fields in the A'ercituoshan area, Qinghai

以研究区成矿地质背景为基础,将其划分为4个地球化学区,从多重分形理论出发,应用“元素含量—面积”模型方法,对各区主要成矿元素的地球化学(异常)场进行分析研究。结果表明,由于地质构造背景和化探元素富集的成因机理不同,各区元素地球化学(异常)场具有两种不同的多重分形特征模式:只有两个无标度区的简单多重分形模式和有两个以上无标度区的高丛集多重分形模式,具有相同成因的元素组合具有相似的多重分形特征。在此基础上,探讨了各区元素的成矿富集规律和空间分布特征,进而划分了地球化学背景和异常,经检验对比,证明了该方法的有效性和实用性。

Based on the ore-forming geological backgrounds, the study area is divided into 4 geochemical districts. By using the concentration-area (C-A) multifractal method, the geochemical (anomaly) fields of major ore-forming elements from stream sediments in various geochemical districts have been studied. The results show that owing to different geological backgrounds and different geneses of element concentration, the geochemical (anomaly) fields in these districts have two different multifractal models: the simple multifractal model with only two non-scale sections and the highly clustered multifractal model with more than two non-scale sections, and the element assemblages with the same genesis have similar multifractal features. On that basis, the spatial distribution and concentration pattern of geochemical elements are discussed, and then geochemical backgrounds and anomalies are distinguished. By check and comparison, this method is proved effective and practical.