| 西藏哈姆曲锑(金)矿床曲珍矿段S、Pb同位素组成及意义 |
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| 关键词:sulfur isotope lead isotope source of ore-forming materials Quzhen Hamuqu Tibet |
| 基金项目:国家重点研发计划“深地资源勘查开采”重点专项(编号: 2018YFC0604106);中国地质科学院矿产资源研究所基本科研业务专项(编号: KK1903);国家自然科学基金项目(编号: 41873046);中国地质调查局地质调查项目(编号: DD2019167) |
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| 摘要: |
| Sulfur and Lead Isotope Compositions and Their Geological Significances in the Quzhen Sb Mineralization Section of the Hamuqu Sb-Au Deposit, Tibet |
| The Hamuqu antimony deposit in Tibet is located in the western margin of the Yarlung Zangbo suture zone, and ore bodies are mainly found in the Late Cretaceous mylonitized diorite porphyrite. The ore bodies in the Quzhen mineralization section, which are mainly veined, layered and lenticular-like are controlled by NNE–SSW trending faults. On the basis of field geological investigation and analysis of ore-forming geological conditions, the S and Pb isotopes of stibnite in the deposit were studied, and the sources of metallogenic materials of the deposit were discussed. The δ34S values of stibnite range from –4.7‰ to –3.2‰, with an average of –3.97‰. The distribution of sulfur isotope composition is relatively concentrated and similar to the range of magmatic sulfur (–4‰ to 9‰), indicating that sulfur isotope has the characteristics of magmatic sulfur. 206Pb/204Pb isotope compositions of stibnite ranges from 18.557 to 18.690, with an average value of 18.622; 207Pb/204Pb ranges from 15.607 to 15.681, with an average of 15.647; 208Pb/204Pb isotope value ranges from 38.793 to 39.147, with an average of 38.967. The lead isotope composition of the deposit is little variable and shows normal lead features. Combined with the μ values (9.46~9.59) of lead isotope and the lead isotopic tectonic evolution features, we propose that the lead isotope of the deposit has the characteristics of crust-mantle mixed sources. |
| LI Bao-liang,WANG Li-qiang,ZHANG Xiang-guo,PINGCUO Duo-ji,GAO Teng,WANG Yong.2022.Sulfur and Lead Isotope Compositions and Their Geological Significances in the Quzhen Sb Mineralization Section of the Hamuqu Sb-Au Deposit, Tibet[J].Acta Geoscientica Sinica,43(2):202-210. |
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