西藏铁格隆南超大型Cu(Au、Ag)矿床S、Pb同位素地球化学研究 |
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关键词:sulfur and lead isotope source of metallogenic materials porphyry-epithermal Cu (Au, Ag) Bangong Co–Nujiang metallogenic belt Tibet |
基金项目:国土资源部公益性行业科研专项(编号: 201511017);国家自然基金科研项目(编号: 41402177; 41402178);青藏专项地质调查项目(编号: 12120114050401);中铝资源西藏金龙矿业股份有限公司项目(编号: XZJL-2013-JS03) |
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摘要: |
Geochemical Characteristics of Sulfur and Lead Isotopes from the Superlarge Tiegelongnan Copper (Gold-silver) Deposit, Tibet |
The Tiegelongnan ore deposit, located in the north of the Duolong ore concentration area, is the first superlarge porphyry-epithermal copper (gold-silver) deposit related to high sulfidation discovered in the western part of the Bangong Co–Nujiang metallogenic belt in recent years. In this paper, S, Pb isotopes of the typical rock (mineral) samples in the Tiegelongnan deposit were analysed to identify the source of metallogenic materials. The δ34S values of the Tiegelongnan deposit vary from –9.8‰ to 6.8‰ with the average value being –1.8‰, and the frequency histogram shows the tower appearance, generally representing the trait of mantle sulfur, mixed with a small quantity of crustal sulfur. The initial constituents of Pb in minerals of the Tiegelongnan deposit (206Pb/204Pb=17.959~18.653, 207Pb/204Pb=15.606~15.707, 208Pb/204Pb=37.926~39.007) is almost the same as those of ore-bearing granodiorite porphyry (206Pb/204Pb=18.527~18.681, 207Pb/204Pb=15.564~15.632, 208Pb/204Pb=38.697~38.724) and andesite (206Pb/204Pb=18.543~18.572, 207Pb/204Pb=15.529~15.538, 208Pb/204Pb=38.654~38.672), indicating that they were derived from the same place. Combined with the analyses of structure-pattern map and source-discrimination map of Pb isotopes, it is suggested that the Pb of the Tiegelongnan deposit mainly originated from upper crust-mantle mixed subduction zone which was connected with magmatism. Therefore, judging from the components of sulfur and lead isotopes in the Tiegelongnan copper (gold-silver) deposit, it can be concluded that the metallogenic materials primarily originated from hypomagma, which was generated from partial melted mantle material mixed with some subduction plates of Bangong Co–Nujiang oceanic basin, with the addition of a small amount of crustal materials. |
WANG Yi-yun,TANG Ju-xing,SONG Yang,LIN Bin,YANG Chao,WANG Qin,GAO Ke,DING Shuai.2017.Geochemical Characteristics of Sulfur and Lead Isotopes from the Superlarge Tiegelongnan Copper (Gold-silver) Deposit, Tibet[J].Acta Geoscientica Sinica,38(5):627-637. |
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