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New constraints on the origin of the Maozu carbonate-hosted epigenetic Zn-Pb deposit in NE Yunnan Province, SW China
Lin-Jun Wang;   Mei Mi;   Jia-Xi Zhou;   Kai Luo
2018
发表期刊Ore Geology Reviews
卷号101页码:578-594
摘要

Micro-scale isotopic compositions determined by micro-beam in situ analysis techniques are expected to provide new information for the understanding of ore genesis. Here we use the Maozu (similar to 20 Mt of sulfide ore, grading 7.25 wt% Zn and 4.15 wt% Pb) Zn-Pb deposit in the Upper Yangtze Zn-Pb metallogenic province as a case study, utilizing NanoSIMS in situ S, femtosecond LA-MC-ICPMS in situ Pb and conventional bulk Sr isotopes, as well as field data, aimed to reveal its origin and ore formation process. NanoSIMS in situ delta S-34 values of sulfide minerals from the Maozu deposit have a wider range (+5.9-+20.7 parts per thousand) than that of bulk delta S-34 values (+9.9-+19.9 parts per thousand). Such S isotope signatures reflect the enrichment of heavy S isotopes in ore-forming fluids, and further indicate the source of S is multiple reservoirs (e.g. marine evaporites, coeval seawater, and metamorphic rocks/fluids). Pb isotopic ratios of galena determined by LA-MC-ICPMS in situ techniques have a narrower range ((206)pb/Pb-204 = 18.20-18.21, Pb-207/Pb-204 = 15.69-15.71 and Pb-208/Pb-204 = 38.40-38.43) than that of bulk Pb isotopic ratios (Pb-206/Pb-204 = 18.13-18.38, (207)pb/(204)pb = 15.64-15.69 and (208)pb/(204)pb = 38.22-38.58). This implies that in situ Pb isotopes can truly reflect the source of Pb, which is due to impurities enclosed by sulfide crystals and pollutants introduced by chemical analysis could significantly affect the quality of the bulk Pb isotopic data. Compared with previously reported Pb isotopic data of potential source rocks (i.e. late Permian Emeishan basalts, Paleozoic ore-bearing sedimentary rocks and Proterozoic basement metamorphic rocks), the in situ Pb isotopic data are significantly different from those of basalts, but are similar to those of both basements and sediments. This means that metal-rich fluids were mainly derived from and/or flowed through basements and sediments. Sphalerite separates have initial Sr isotopic ratios (0.711-0.719) that are distinctly different from those of ore formation age-corrected basalts (Sr-87/Sr-86(200) (Ma) = 0.704-0.708) and basements (Sr-87/Sr-86(200) (Ma) = 0.724-0.729), whereas partly overlap with those of age-corrected sediments (Sr-87/Sr-86(200) (Ma) = 0.707-0.714). Such Sr isotope signatures suggest that hydrothermal fluids were predominantly derived from and/or flowed through basements and sediments with a certain influence from basalts. Hence, the Maozu deposit has complex source rocks that are related to the local geological setting. The mixing of metal-rich fluids (related to basements and sediments, and even basalts) and S-bearing fluids (associated with multiple S reservoirs) plays a key role in the formation of sulfide ores. Therefore, the Maozu deposit, formed during Early Mesozoic (similar to 196 Ma), is an epigenetic Zn-Pb deposit that hosts in carbonate rocks, occurs along fault-fold structures, and has a mixed source of mineralizing elements and associated fluids.

关键词Nanosimsin Situs Isotopes La-mc-icpm Sin Situpb Isotopes Bulk Sr Isotopes Ore Formation Processes The Upper Yangtze Zn-pb Metallogenic Province, South China
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/42920512-1/8907
专题矿床地球化学国家重点实验室
作者单位1.Architecture Engineering College, Guizhou Minzu University, Guiyang 550025, China
2.School of Resource Environment and Earth Sciences, Yunnan University, Kunming 650504, China
3.State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China
4.CAS Key Laboratory of Mineralogy and Metallogeny, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China
5.University of Chinese Academy of Sciences, Beijing 10049, China
推荐引用方式
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Lin-Jun Wang; Mei Mi; Jia-Xi Zhou; Kai Luo. New constraints on the origin of the Maozu carbonate-hosted epigenetic Zn-Pb deposit in NE Yunnan Province, SW China[J]. Ore Geology Reviews,2018,101:578-594.
APA Lin-Jun Wang; Mei Mi; Jia-Xi Zhou; Kai Luo.(2018).New constraints on the origin of the Maozu carbonate-hosted epigenetic Zn-Pb deposit in NE Yunnan Province, SW China.Ore Geology Reviews,101,578-594.
MLA Lin-Jun Wang; Mei Mi; Jia-Xi Zhou; Kai Luo."New constraints on the origin of the Maozu carbonate-hosted epigenetic Zn-Pb deposit in NE Yunnan Province, SW China".Ore Geology Reviews 101(2018):578-594.
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