| Citation: | LI Zeng-hua, CHENG Qiu-ming, XIE Shu-yun, XU De-yi, XIA Qing-lin, ZHANG Sheng-yuan, 2009. Application of P-A Fractal Model for Characterizing Distributions of Pyrrhotites in Seven Layers of Basalts in Gejiu District, Yunnan, China. Earth Science, 34(2): 275-280.
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The study on micro-pores of soils, pore-fracture-holes of sedimentary rocks and microstructures of minerals at different scales has attracted more and more attention.Typical fractal models, including P-A and box-counting methods, have also been used for such kind of studies.Basalts from seven sections in Laochang deposit, Yunnan Province, are well developed, but their forming processes and their contributions to deposits of Sn and other metals are still in issue.Based on the GIS-based P-A and box-counting fractal models, this paper focuses on the size distribution and irregularity analysis of pyrrhotites of the basalts.Three parameters DA (fractal dimension of area), DPA (fractal dimension of area and perimeter) and DP (fractal dimension of perimeter) of pyrrhotite are calculated.The results show that, from the first-section basalt to the seventh-section basalt, with the depth of rock body increasing, the values of DA and DP change a little, but the value of DPA shows an increasing trend.This indicates that the shapes of pyrrhotites become more and more irregular as the depth increases, probably due to the increase of temperature and pressure.
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