| Constraints of C-O-S-Pb isotope compositions and Rb-Sr isotopic age on the origin of the Tianqiao carbonate-hosted Pb-Zn deposit, SW China | |
| Jiaxi Zhou; Zhilong Huang; Meifu Zhou; Xiaobiao Li; Zhongguo Jin | |
| 2013 | |
| Source Publication | Ore Geology Reviews
 |
| Volume | 53Issue:1Pages:77-92 |
| Abstract | The Tianqiao Pb-Zn deposit in the western Yangtze Block, southwest China, is part of the Sichuan-Yunnan-Guizhou (SYG) Pb-Zn metallogenic province. Ore bodies are hosted in Devonian and Carboniferous carbonate rocks, structurally controlled by a thrust fault and anticline, and carried about 0.38 million tons Pb and Zn metals grading >15% Pb + Zn. Both massive and disseminated Pb-Zn ores occur either as veinlets or disseminations in dolomitic rocks. They are composed of ore minerals, pyrite, sphalerite and galena, and gangue minerals, calcite and dolomite. delta S-34 values of sulfide minerals range from +8.4 to +14.4 parts per thousand and display a decreasing trend from pyrite, sphalerite to galena (delta S-34(pyrite)>delta S-34(sphalerite)>delta S-34(galena)). We interpret that reduced sulfur derived from sedimentary sulfate (gypsum and barite) of the host Devonian to Carboniferous carbonate rocks by thermal-chemical sulfate reduction (TSR). delta C-13(PDB) and delta O-18(SMOW) values of hydrothermal calcite range from -5.3 to -3.4 parts per thousand. and +14.9 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 was a mixture origin of mantle, marine carbonate rocks and sedimentary organic matter. Sulfide minerals have homogeneous and low radiogenic Pb isotope compositions (Pb-206/Pb-204 = 18.378 to 18.601, Pb-207/Pb-204 = 15.519 to 15.811 and Pb-208/Pb-204 = 38.666 to 39.571) that are plotted in the upper crust Pb evolution curve and overlap with that of Devonian to Carboniferous carbonate rocks and Proterozoic basement rocks in the SYG province. Pb isotope compositions suggest derivation of Pb metal from mixed sources. Sulfide minerals have Sr-87/Sr-86 ratios ranging from 0.7125 to 0.7167, higher than Sinian to Permian sedimentary rocks and Permian Emeishan flood basalts, but lower than basement rocks. Again, Sr isotope compositions are supportive of a mixture origin of Sr. They have an Rb-Sr isotopic age of 191.9 +/- 6.9Ma, possibly reflecting the timing of Pb-Zn mineralization. C-O-S-Pb-Sr isotope compositions of the Tianqiao Pb-Zn deposit indicate a mixed origin of ore-forming fluids, which have Pb-Sr isotope homogenized before the mineralization. The Permian flood basalts acted as an impermeable layer for the Pb-Zn mineralization hosted in the Devonian-Carboniferous carbonate rocks. |
| Subject Area | 矿床地球化学 |
| Indexed By | SCI |
| Language | 英语 |
| Document Type | 期刊论文 |
| Identifier | http://ir.gyig.ac.cn/handle/352002/5079 |
| Collection | 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 |
| Recommended Citation GB/T 7714 | Jiaxi Zhou,Zhilong Huang,Meifu Zhou,et al. Constraints of C-O-S-Pb isotope compositions and Rb-Sr isotopic age on the origin of the Tianqiao carbonate-hosted Pb-Zn deposit, SW China[J]. Ore Geology Reviews,2013,53(1):77-92. |
| APA | Jiaxi Zhou,Zhilong Huang,Meifu Zhou,Xiaobiao Li,&Zhongguo Jin.(2013).Constraints of C-O-S-Pb isotope compositions and Rb-Sr isotopic age on the origin of the Tianqiao carbonate-hosted Pb-Zn deposit, SW China.Ore Geology Reviews,53(1),77-92. |
| MLA | Jiaxi Zhou,et al."Constraints of C-O-S-Pb isotope compositions and Rb-Sr isotopic age on the origin of the Tianqiao carbonate-hosted Pb-Zn deposit, SW China".Ore Geology Reviews 53.1(2013):77-92. |
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