Element geochemical characteristics of No.Ⅱ ore body of the Xiongcun porphyry copper-gold deposit in Tibet
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    Abstract:

    The Xiongcun copper-gold deposit is an island arc porphyry copper-gold deposit newly discovered in the Gangdise metallogenic belt. It consists of three ore bodies. No.Ⅱ ore body is located 3 km northwest of No.Ⅰ ore body. Cu, Au, and Ag mineralizations occur in early K-silicate alteration zone and sericite-muscovite-quartz-sulphide zone. Early K-silicate alteration is characterized by biotite+magnetite±K-feldspar+chalcopyrite+pyrite, and is rich in magnetite. Element distribution characteristics and correlation analysis show that Cu is well correlated to Au and Ag. Au- and Ag-bearing chalcopyrite is mainly distributed at the center of the ore deposit. Cu is positively related to K, Rb and negatively related to Na, suggesting that the mineralization is mainly related to early K-silicate alteration. Later mineralization occurs around the ore body mainly as sphalerite and galena veins. From the center to the outer part, sixteen elements related to Cu, Au and Ag are zoned around the center, i.e., Cu, Au, Ag, K, Rb, Ba-Mo-Co, Ni-Pb, Zn, Mn, Ag, Sb-Na. The element distribution is similar to zoned alteration. They are controlled by such factors as hydrothermal fluid, translation condition, p-T and primary composition of the host rock. The zoned element characteristics and assemblies are of guiding significance for future exploration.

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黄勇,唐菊兴,丁俊,郎兴海,李志军,张丽,2012,西藏雄村斑岩铜金矿床Ⅱ号矿体元素地球化学特征及其指示意义[J].岩石矿物学杂志,31(3):361~370. HUANG Yong, TANG Ju-xing, DING Jun, LANG Xing-hai, LI Zhi-jun, ZHANG Li,2012,Element geochemical characteristics of No.Ⅱ ore body of the Xiongcun porphyry copper-gold deposit in Tibet[J]. Acta Petrologica et Mineralogica,31(3):361~370.

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  • Received:September 08,2011
  • Revised:March 16,2012
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