A Tentative Discussion on the Application of Multi-fractal Models to the Analysis of Regional Geochemical Anomalies
多重分形模型在区域地球化学异常分析中的应用探讨

As an important step in geochemical exploration, the analysis of geochemical anomalies is of great significance in the effective discovery of anomalies. However, in previous studies, researchers only focused on the investigation of the positive anomalies of metallogenic elements and their accompanying elements, and paid less attention to the study of the negative anomalies formed by the depletion of elements. As a matter of fact, negative anomalies play the same important role as positive anomalies in geochemical exploration. The absence of effective methods for discovering negative anomalies, especially the method for determining the upper limit of the negative anomaly, was one of the factors responsible for the ignoring of these anomalies in the past. Based on the stream sediment data obtained from 1:200,000 geochemical survey in Xiadong of Beishan area, the authors probed into the feasibility of the application of multi-fractal models to ascertaining the upper limit of the negative anomaly. The result shows that the upper limit of Ba could effectively delineate Ba negative anomaly in the Huitongshan copper deposit.