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Strontium and Lead Isotopic Study of the Carbonate-hosted Xujiashan Antimony Deposit from Hubei Province, South China: Implications for its Origin
Neng-Ping Shen; Jian-Tang Peng; Rui-Zhong Hu; Shen Liu; Ian M. Coulson
2011
Source PublicationResource Geology
Volume61Issue:1Pages:52-62
AbstractThe Xujiashan antimony deposit is hosted by marine carbonates of the Upper Sinian Doushantuo and Dengying Formations in Hubei Province, South China. Our Sr isotopic data from pre- and syn-mineralization calcites that host the mineralization show that the pre-mineralization calcite displays a narrow range of 87Sr/86Sr ratios (0.7096 to 0.7097), similar to the ratios of the Sinian seawater, and high Sr concentrations (2645 to 8174 ppm). In contrast, the syn-mineralization calcite exhibits low Sr concentrations (785 to 2563 ppm) and high 87Sr/86Sr ratios (0.7109 to 0.7154), which is interpreted as the result of addition of radiogenic strontium during the antimony mineralization. The study of Sr isotopes suggests that their Sr component to the pre-mineralization calcite derived directly from the host rocks (i.e. the Sinian marine carbonates), while radiogenic 87Sr for the syn-mineralization calcite derived from the underlying Mesoproterozoic Lengjiaxi Group basement through hydrothermal fluid circulation along the major fault that hosts the mineralization. The Pb isotopic ratios of stibnite are subdivided into two groups (Group A and Group B), Group A is characterized by higher radiogenic lead, with 206Pb/204Pb = 18.874 to 19.288, 207Pb/204Pb = 15.708 to 15.805, and 208Pb/204Pb = 38.642 to 39.001. Group B shows lower lead isotope ratios (206Pb/204Pb = 17.882 to 18.171, 207Pb/204Pb = 15.555 to 15.686, and 208Pb/204Pb = 37.950 to 38.340). The single-stage model ages of Group A are mainly negative or slightly positive values (-258 to 3 Ma), while those of Group B range from 636 to 392 Ma, with an average of 495 65 Ma. In addition, there are positive linear correlations among Pb isotopic ratios. These results suggest that the lead of Group A stibnite was mainly derived from the Sinian marine carbonates, and that of Group B stibnite from the underlying Lengjiaxi Group basement. This conclusion is consistent with the results of the Sr isotopes. These results indicate that the Xujiashan deposit is not syngenetic sedimentary and in situ reworked origin as previously considered. The metal (mainly Sb) of this deposit was not only derived from the Sinian host rocks, but also partly derived from the underlying Mesoproterozoic Lengjiaxi Group basement.
KeywordHubei Province Lead And Strontium Isotopes Ore Origin Xujiashan Antimony Deposit South China
Subject Area矿床地球化学
Indexed BySCI
Language英语
Document Type期刊论文
Identifierhttp://ir.gyig.ac.cn/handle/352002/7066
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
Neng-Ping Shen,Jian-Tang Peng,Rui-Zhong Hu,et al. Strontium and Lead Isotopic Study of the Carbonate-hosted Xujiashan Antimony Deposit from Hubei Province, South China: Implications for its Origin[J]. Resource Geology,2011,61(1):52-62.
APA Neng-Ping Shen,Jian-Tang Peng,Rui-Zhong Hu,Shen Liu,&Ian M. Coulson.(2011).Strontium and Lead Isotopic Study of the Carbonate-hosted Xujiashan Antimony Deposit from Hubei Province, South China: Implications for its Origin.Resource Geology,61(1),52-62.
MLA Neng-Ping Shen,et al."Strontium and Lead Isotopic Study of the Carbonate-hosted Xujiashan Antimony Deposit from Hubei Province, South China: Implications for its Origin".Resource Geology 61.1(2011):52-62.
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