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Volume 19 Issue 4
Aug 2008
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Yong-qing CHEN, Jing-ning HUANG, Zhen LIANG. Geochemical Characteristics and Zonation of Primary Halos of Pulang Porphyry Copper Deposit, Northwestern Yunnan Province, Southwestern China. Journal of Earth Science, 2008, 19(4): 371-377.
Citation: Yong-qing CHEN, Jing-ning HUANG, Zhen LIANG. Geochemical Characteristics and Zonation of Primary Halos of Pulang Porphyry Copper Deposit, Northwestern Yunnan Province, Southwestern China. Journal of Earth Science, 2008, 19(4): 371-377.

Geochemical Characteristics and Zonation of Primary Halos of Pulang Porphyry Copper Deposit, Northwestern Yunnan Province, Southwestern China

Funds:

the National High Technology Research and Development Program of China 2006AA06Z113

the National Natural Science Foundation of China 40772197

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  • Corresponding author: CHEN Yong-qing, Email: yqchen@cugb.edu.cn
  • Received Date: 30 Mar 2008
  • Accepted Date: 20 May 2008
  • The Pulang (普朗) porphyry copper deposit, located in the southern segment of the Yidun-Zhongdian (义敦-中甸) island arc ore-forming belt of the Tethys-Himalaya ore-forming domain, is a recently discovered large copper deposit. Compared with the composition of granodiorite in China, the porphyry rocks in this area are enriched in W, Mo, Cu, Au, As, Sb, F, V, and Na2O (K1≥1.2). Compared with the composition of fresh porphyry rocks in this district, the mineralized rocks are enriched in Cu, Au, Ag, Mo, Pb, Zn, W, As, Sb, and K2O (K2≥1.2). Some elements show clear anomalies, such as Zn, Ag, Cu, Au, W, and Mo, and can be regarded as pathfinders for prospecting new ore bodies in depth. It has been inferred from factor analysis that the Pulang porphyry copper deposit may have undergone the multiple stages of alteration and mineralization: (a) Cu-Au mineralization; (b) W-Mo mineralization; and (c) silicification and potassic metasomatism in the whole ore-forming process. A detailed zonation sequence of indicator elements is obtained using the variability index of indicator elements as follows: Zn→Ag→Cu→Au→W→Mo. According to this zonation, an index such as (Ag×Zn)D/ (Mo×W)D can be constructed and regarded as a significant criterion for predicting the Cu potential at a particular depth.

     

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