Multifractal characteristics of gold grades series in the Dayingezhuang Deposit, Jiaodong Gold Province, China

摘要

In the paper, the multifractal detrended fluctuation analysis is used to investigate the multifractal characteristics of gold grades series in the Dayingezhuang gold deposit, Jiaodong province, China. Results obtained from the multifractal parameters and multifractal spectra show that the gold grades series exhibit multifractal scaling and different long-range correlations. The asymmetry of multifractal spectrum shows that the range of the right-side branches of the multifractal spectrum is larger than that of the left-side branches for the gold grades series of intensely mineralized drifts, but the gold grades series of the barely mineralized zones is on the contrary, which indicates that the shape of of multifractal spectrum may provide directions in the study of ore-forming potential. Moreover, we analyze the sources of multifractality quantifying the contributions of two factors, the long-range correlations and the broad fat-tail distributions. We find that the multifractality structure of gold grades series is due to both long-range correlation and the fat-tail probability density function, but the former is greater attributed to the latter.