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| Citation: | HUANG Jing-ning, ZHAO Peng-da, 2009. Quantitative Extraction and Estimation of Conceal Mineralization Anomalies of Pt-Cu-Au in Eastern Yunnan Province. Earth Science, 34(2): 365-374.
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Eastern Yunnan area is the important Cu-Au-PGE ore-forming perspective area in China.The factor analysis, geostatistics and multifractal S-A filtering method are applied in this paper to quantitatively extract and estimate the Pt-Cu-Au mineralization anomalies from the complicated geological background.The research shows that: (1) the results of factor analysis illustrate that there are three element associations existing in eastern Yunnan area: factor Ⅰ (Cu-Pd-Co-Pt-V-Cr-Ni), which characterizes the element association of the Permian Er'meishan basalt occurred in the Yangtz block, Similarly; factor Ⅱ (Sb-As-U-Mo), which characterizes the carbonaceous sediment formation occurred in the South China fold system and factor Ⅲ (Pb-Ag-Zn-W-Zn-As-Au), which represents the hydrothermal mineralization with the base metal mineralization as the typification; (2) the semivariation analysis illustrates that the concentrations of Pt, Cu and Au are continuous in NE trend (9°-18.6°) and the maximal ranges are about 95km.The geochemical maps obtained by the universal Kringing imply that the concentration distributions of Pt, Cu and Au are mainly controlled by the faults and magmatism; (3) the multifractal S-A filtering method characterizes the detailed information of local mineralization and extracts the conceal mineralization information.The anomaly maps delineated by the S-A method may provide important evidence for Pt-Cu-Au targeting; (4) different geological and ore-forming problems can be solved by different geomathematic methods.The linear geomathematic methods such as the factor analysis and geostatistics can be used to explore the regional ore-forming background and the regional spatial variability of the ore-forming elements and the element associations, while the nonlinear geomathematic methods such as S-A method are efficient in extracting the local ore-forming information.These methods are of benefit to the concealed ore-forming anomaly information extraction.
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