XIANG Zhong-lin1，GU Xue-xiang2*，WANG En-ying1，ZHANG Yong-mei2，WANG Xin-li3，PENG Yi-wei4
(1. Institute of Resources and Environment，Henan Polytechnic University，Jiaozuo 454000，China;
2. School of Earth Sciences and Resources，China University of Geosciences，Beijing 100083，China;
3. Xinda Gold & Silver Development Centre, Beijing 100038, China;
4. College of Earth Sciences, Chengdu University of Technology, Chengdu 610059, China)
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.
Keywords: geochemical anomaly; factor analysis; C-A multi-element fractal model; synthetic anomaly; the Boluokenu metallogenic belt
ACTA MINERALOGICA SINICA Vol. 39, No.2, 2019, page 183-191
