| Geological and C-O-S-Pb-Sr isotopic constraints on the origin of the Qingshan carbonate-hosted Pb-Zn deposit, Southwest China | |
| Jia-Xi Zhou; Zhi-Long Huang; Jian-Guo Gao; Zai-Fei Yan | |
| 2013 | |
| 发表期刊 | International Geology Review
 |
| 卷号 | 55期号:7页码:904-916 |
| 摘要 | Located in the western Yangtze Block, the Qingshan PbZn deposit, part of the SichuanYunnanGuizhou PbZn metallogenic province, contains 0.3 million tonnes of 9.86 wt.% Pb and 22.27 wt.% Zn. Ore bodies are hosted in Carboniferous and Permian carbonate rocks, structurally controlled by the WeiningShuicheng anticline and its intraformational faults. Ores composed of sphalerite, galena, pyrite, dolomite, and calcite occur as massive, brecciated, veinlets, and disseminations in dolomitic limestones. The CO isotope compositions of hydrothermal calcite and SPbSr isotope compositions of Qingshan sulphide minerals were analysed in order to trace the sources of reduced sulphur and metals for the PbZn deposit. C-13(PDB) and O-18(SMOW) values of calcite range from 5.0 parts per thousand to 3.4 parts per thousand and +18.9 parts per thousand to +19.6 parts per thousand, respectively, and fall in the field between mantle and marine carbonate rocks. They display a negative correlation, suggesting that CO2 in the hydrothermal fluid had a mixed origin of mantle, marine carbonate rocks, and sedimentary organic matter. S-34 values of sulphide minerals range from +10.7 parts per thousand to +19.6 parts per thousand, similar to Devonian-to-Permian seawater sulphate (+20 parts per thousand to +35 parts per thousand) and evaporite rocks (+23 parts per thousand to +28 parts per thousand) in Carboniferous-to-Permian strata, suggesting that the reduced sulphur in hydrothermal fluids was derived from host-strata evaporites. Ores and sulphide minerals have homogeneous and low radiogenic Pb isotope compositions (Pb-206/Pb-204 = 18.561 to 18.768, Pb-207/Pb-204 = 15.701 to 15.920, and Pb-208/Pb-204 = 38.831 to 39.641) that plot in the upper crust Pb evolution curve, and are similar to those of Devonian-to-Permian carbonate rocks. Pb isotope compositions suggest derivation of Pb metal from the host rocks. Sr-87/Sr-86 ratios of sphalerite range from 0.7107 to 0.7136 and (Sr-87/Sr-86)(200Ma) ratios range from 0.7099 to 0.7126, higher than Sinian-to-Permian sedimentary rocks and Permian Emeishan flood basalts, but lower than Proterozoic basement rocks. This indicates that the ore strontium has a mixture source of the older basement rocks and the younger cover sequence. COSPbSr isotope compositions of the Qingshan PbZn deposit indicate a mixed origin of the ore-forming fluids and metals. |
| 学科领域 | 矿床地球化学 |
| 收录类别 | SCI |
| 语种 | 英语 |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://ir.gyig.ac.cn/handle/352002/5085 |
| 专题 | 矿床地球化学国家重点实验室_矿床地球化学国家重点实验室_期刊论文 |
| 推荐引用方式 GB/T 7714 | Jia-Xi Zhou,Zhi-Long Huang,Jian-Guo Gao,et al. Geological and C-O-S-Pb-Sr isotopic constraints on the origin of the Qingshan carbonate-hosted Pb-Zn deposit, Southwest China[J]. International Geology Review,2013,55(7):904-916. |
| APA | Jia-Xi Zhou,Zhi-Long Huang,Jian-Guo Gao,&Zai-Fei Yan.(2013).Geological and C-O-S-Pb-Sr isotopic constraints on the origin of the Qingshan carbonate-hosted Pb-Zn deposit, Southwest China.International Geology Review,55(7),904-916. |
| MLA | Jia-Xi Zhou,et al."Geological and C-O-S-Pb-Sr isotopic constraints on the origin of the Qingshan carbonate-hosted Pb-Zn deposit, Southwest China".International Geology Review 55.7(2013):904-916. |
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