Fractal analysis of the ore-forming process in a skarn deposit: a case study in the Shizishan area, China
Qingfei Wang, Jun Deng, Huan Liu, Li Wan, Zhijun Zhang, 2011. "Fractal analysis of the ore-forming process in a skarn deposit: a case study in the Shizishan area, China", Granite-Related Ore Deposits, A. N. Sial, J. S. Bettencourt, C. P. De Campos, V. P. Ferreira
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This paper presents a tool for analysing the element distribution and mineralization intensity. The Hurst exponents and a-f(a) multifractal spectrum are utilized to analyse the irregular element distribution in Shizishan skarn orefield, China. The Hurst exponents reveal the Cu, Ag, Au and Zn distributions in the skarn-dominated drill cores are persistent and those in marble-dominated drill core are nearly random; the persistence indicates the mineralized segments are repeatedly developed, with accordance to multi-layer structure of the ore-controlling bedding faults and orebodies. The small amin (minimum multifractal singularity) of the Cu, Ag and Au in M1 reflect bare mineralization. The amin also displays that the mineralization intensities are varied for distinct elements and for different locations, yet the similarity of the distinct ore-forming processes is manifested by constant amin/f(amin) ratio. The constant ratio indicates the wider mineralization range denotes a more compact concentration distribution. The compact distributions represent the wide Cu, Ag and Au mineralization in skarns, and the loose distributions reflect the bare Cu, Ag and Au mineralization in marbles. Moreover amin shows a positive correlation with Hurst exponents in the Shizishan skarn orefield. Using fractal analysis the author’s show that although the mineralization intensities for different elements and different locations along the Shizishan skarn orefield is not consistent, similar mineralization processes can be correlated to similar fractal exponents.