Sulfur and lead isotopic variations in the giant Yulong porphyry Cu (Mo–Au) deposit from the eastern Tibetan Plateau: Implications for origins of S and Pb, and metal precipitation | |
Ming-Liang Huang; Xian-Wu Bi; Jian-Feng Gao; Lei-Luo Xu; Jia-Fei Xiao; Shen-Tai Liu; Xin-Song Wang; Ting Zhou | |
刊名 | Journal of Geochemical Exploration |
2019 | |
卷号 | 197页码:70-83 |
关键词 | Yulong Porphyry Cu (Mosingle Bondau) Deposit s And Pb Isotopes Ore-forming Materials |
英文摘要 | The giant Yulong porphyry Cu (MoAu) deposit, located in the eastern Tibetan Plateau, is a typical post-subduction porphyry Cu ± Mo ± Au deposit formed in an intracontinental strike-slip fault system, and it is also one of the largest porphyry Cu deposits in China with reserves of 6.5Mt Cu @ 0.62% and 0.41Mt Mo @ 0.042%, respectively. In this study, sulfur and lead isotopic compositions of sulfides and ore-related porphyry samples were determined to constrain the sources of ore-forming materials and ore-forming process. Sulfides (e.g., pyrite, chalcopyrite and molybdenite) from phyllic alteration zone, where the Cu and Mo mineralization mainly occurred, have uniform δ34S values ranging from −0.6 to +2.1‰ (average + 1.1‰), which indicates a magmatic origin of the sulfur. In situ Nano-SIMS sulfur isotope analysis further reveals that pyrites formed in potassic alteration stage have systematically negative δ34S values ranging from −0.2 to −9.7‰ (average − 4.5‰), whereas pyrites formed in phyllic alteration stage have systematically positive δ34S values ranging from +1.1 to +3.2‰ (average + 2.1‰). This regular variation is considered to be resulted from disproportionation of aqueous SO2 and subsequent sulfate reduction, further suggesting a magmatic origin of the sulfur. The sulfides have initial Pb isotopic compositions ((206Pb/204Pb)i = 18.616–18.812, (207Pb/204Pb)i = 15.670–15.740, (208Pb/204Pb)i = 38.956–39.080) deviating from those of the ore-related porphyries ((206Pb/204Pb)i = 18.549–18.718, (207Pb/204Pb)i = 15.647–15.662, (208Pb/204Pb)i = 38.794–39.888), but more close to those of the ore-hosting strata ((206Pb/204Pb)i = 18.423–18.761, (207Pb/204Pb)i = 15.654–15.713, (208Pb/204Pb)i = 38.867–39.062). The shift of Pb isotopic compositions of sulfide minerals toward those of ore-hosting strata indicates that the ore-hosting strata had provided a significant amount of Pb for ore formation, and most probably suggests fluid-rock interaction processes in the hydrothermal system. Our study represents a case study in which ore-hosting strata had provided a significant amount of ore-forming materials for porphyry Cu ± Mo ± Au formation in the post-subduction setting. |
语种 | 英语 |
内容类型 | 期刊论文 |
源URL | [http://ir.gyig.ac.cn/handle/42920512-1/10911] |
专题 | 地球化学研究所_矿床地球化学国家重点实验室 |
作者单位 | 1.State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China 2.University of Chinese Academy of Sciences, Beijing 100049, China 3.Tibet Yulong copper industry Company Ltd, Tibet, Changdu 854100, China |
推荐引用方式 GB/T 7714 | Ming-Liang Huang;Xian-Wu Bi;Jian-Feng Gao;Lei-Luo Xu;Jia-Fei Xiao;Shen-Tai Liu;Xin-Song Wang;Ting Zhou. Sulfur and lead isotopic variations in the giant Yulong porphyry Cu (Mo–Au) deposit from the eastern Tibetan Plateau: Implications for origins of S and Pb, and metal precipitation[J]. Journal of Geochemical Exploration,2019,197:70-83. |
APA | Ming-Liang Huang;Xian-Wu Bi;Jian-Feng Gao;Lei-Luo Xu;Jia-Fei Xiao;Shen-Tai Liu;Xin-Song Wang;Ting Zhou.(2019).Sulfur and lead isotopic variations in the giant Yulong porphyry Cu (Mo–Au) deposit from the eastern Tibetan Plateau: Implications for origins of S and Pb, and metal precipitation.Journal of Geochemical Exploration,197,70-83. |
MLA | Ming-Liang Huang;Xian-Wu Bi;Jian-Feng Gao;Lei-Luo Xu;Jia-Fei Xiao;Shen-Tai Liu;Xin-Song Wang;Ting Zhou."Sulfur and lead isotopic variations in the giant Yulong porphyry Cu (Mo–Au) deposit from the eastern Tibetan Plateau: Implications for origins of S and Pb, and metal precipitation".Journal of Geochemical Exploration 197(2019):70-83. |
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