| 西藏尕尔穷铜金矿床S、Pb同位素地球化学特征——成矿物质来源示踪 |
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| 关键词:Ga’erqiong copper gold deposit S, Pb isotope characteristics upper crust source mantle source Western Bangong Co-Nujiang metallogenic belt |
| 基金项目:公益性行业科研专项项目(编号: 201011013-3);国家973项目(编号: 2011CB403103);西藏卓朗基矿业投资有限公司详查项目 |
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| S, Pb Isotope Characteristics of the Ga’erqiong Gold-Copper Deposit in Tibet: Tracing the Source of Ore-forming Materials |
| The Ga’erqiong copper-gold deposit, a skarn-type and breccia-type copper-gold (iron) deposit related to porphyry, was discovered in recent years in the western Bangong Co-Nujang metallogenic zone, Tibet. Based on the study of the S and Pb isotope characteristics of pyrite and chalcopyrite within the skarn ore, the authors traced the source of ore-forming materials, and indicated regional ore-forming metallogenic regularity based on a comparison with the characteristics of regional mineral resources. It is shown that the δ34S value of the minerals is in the range of -2.9‰~0.5‰ with an average of –1.1‰, and the δ34S histogram is distributed approximately in a tower shape, which indicates a mantle source. The 208Pb/204Pb value is between 38.384 and 39.134, and the 207Pb/204Pb value is between 15.577 and 15.725, and the 206Pb/204Pb value is between 18.112 and 18.615, and the μ value is between 9.44 and 9.69, which indicate that Pb was derived from a orogenic belt source composed of the upper crust and the mantle. It is inferred that the ore-forming materials of the Ga’erqiong deposit was mainly from materials with mantle characteristics and Nyainqentanglha basement gneiss. During the arc-landmass collision between southern Qiangtang-Sanjiang composite plate and Gandise- Nyainqentanglha plate in late Cretaceous, a Cu-Au porphyry-skarn metallogenic series related to magma which was derived from the upper mantle or the juvenile crust and contaminated by the upper crust materials formed in the Coqen-Xainza volcanic-magmatic arc at the south edge of western Bangong Co-Nujang suture zone. |
| YAO Xiao-feng,TANG Ju-xing,LI Zhi-jun,DENG Shi-lin,HU Zheng-hua,ZHANG Zhi.2012.S, Pb Isotope Characteristics of the Ga’erqiong Gold-Copper Deposit in Tibet: Tracing the Source of Ore-forming Materials[J].Acta Geoscientica Sinica,33(4):528-536. |
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