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Characteristics and evaluation of soil geochemical anomalies in Dongshanwu area, Ningguo, Anhui Province |
ZHANG Xian-Neng, KOU Shang-Wen, LIU Ai-Hua |
No. 332 Geological Party, Anhui Bureau of Geology and Mineral Exploration, Huangshan 245000, China |
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Abstract The Dongshanwu area lies in northeastern Jiangnan orogenic belt, where stream anomalies of Au-As-Sb were delineated in 1989, and 2 603 soil samples were collected in 2011 for analysis of Au, Ag, Cu, Pb, Zn, As, Sb, Bi, W and Mo. According to mathematical geological analysis and single element anomaly evaluation, the authors hold that they belong to normal distribution except As. Au has a close affinity with As, Sb has a close affinity with Ag and Mo, and Ag and Mo have high background values. The concentration Clarke values and variation coefficients of Sb indicate that Sb were involved in mineralization. Drilling has already revealed Sb orebody, suggesting that the area has a good potential of Sb. Au anomalies are in accord with As anomalies, and Au is a concentrated element and has the biggest variation coefficient, suggesting that Au is unevenly distributed, Au mineral alteration is in accord with the tectonic belt, and Au is positively related to silicification. Through soil geochemical survey, 4 synthetic anomaly belts were delineated in Dongshanwu area, among which, Ⅰ,Ⅱ and Ⅳ have better prospecting potential. In addition, the authors detected that Sb and Au ores resulted from the superimposition of geological activities of different epochs.
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Received: 24 February 2016
Published: 10 February 2017
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