Multifractal study of geochemical (anomaly) fields in the A'ercituoshan area, Qinghai
ZOU Lin1, PENG Sheng-lin1, YANG Zi-an2, LAI Jian-qing1, ZHANG Pu-bin3(1. Institute of Geosciences and Environment, Central-South University, Changsha 410083, Hunan, China;2. China University of Geosciences, Beijing 100083, China;3. China Non-ferrous Metals Resource Geological Survey, Beijing 100012, China)
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.