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Acta Geochimica

, Volume 37, Issue 3, pp 384–394 | Cite as

Re–Os dating of molybdenite and in-situ Pb isotopes of sulfides from the Lamo Zn–Cu deposit in the Dachang tin-polymetallic ore field, Guangxi, China

  • Hai Zhao
  • Wenchao Su
  • Peng Xie
  • Nengping Shen
  • Jiali Cai
  • Ming Luo
  • Jie Li
  • Zhian Bao
Original Article

Abstract

The Dachang tin-polymetallic district, Guangxi, China, is one of the largest tin ore fields in the world. Both cassiterite-sulfide and Zn–Cu skarn mineralization are hosted in the Mid-Upper Devonian carbonate-rich sediments adjacent to the underlying Cretaceous Longxianggai granite (91–97 Ma). The Lamo Zn–Cu deposit is a typical skarn deposit in the district and occurs at the contact zone between the Upper Devonian limestone and the granite. The ore minerals mainly consist of sphalerite, arsenopyrite, pyrrhotite, galena, chalcopyrite, and minor molybdenite. However, the age of mineralization and source of the metals are not well constrained. In this study, we use the molybdenite Re–Os dating method and in-situ Pb isotopes of sulfides from the Lamo deposit for the first time in order to directly determine the age of mineralization and the tracing source of metals. Six molybdenite samples yielded a more accurate Re–Os isochron age of 90.0 ± 1.1 Ma (MSWD = 0.72), which is much younger than the reported garnet Sm–Nd isochron age of 95 ± 11 Ma and quartz fluid inclusions Rb–Sr isochron age of 99 ± 6 Ma. This age is also interpreted as the age of Zn–Cu skarn mineralization in the Dachang district. Further, in this study we found that in-situ Pb isotopes of sulfides from the Lamo deposit and feldspars in the district’s biotite granite and granitic porphyry dikes have a narrow range and an overlap of Pb isotopic compositions (206Pb/204Pb = 18.417–18.594, 207Pb/204Pb = 15.641–15.746, and 208Pb/204Pb = 38.791–39.073), suggesting that the metals were mainly sourced from Cretaceous granitic magma.

Keywords

Molybdenite Re–Os dating In-situ lead isotopes Skarn deposit Dachang 

Notes

Acknowledgements

We gratefully acknowledge the Mining Company of Jilang Indium Industry for access to samples. This work is supported by the National Science Foundation of China (Grants Nos. 41672080, 41772079, 41272113) and Outstanding Talent Foundation of the Institute of Geochemistry, Chinese Academy of Sciences.

Compliance with ethical standards

Conflict of interest

There is no conflict of interest.

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Copyright information

© Science Press, Institute of Geochemistry, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  • Hai Zhao
    • 1
    • 2
  • Wenchao Su
    • 1
    • 6
  • Peng Xie
    • 1
    • 2
  • Nengping Shen
    • 1
  • Jiali Cai
    • 1
  • Ming Luo
    • 3
  • Jie Li
    • 4
  • Zhian Bao
    • 5
  1. 1.State Key Laboratory of Ore Deposit Geochemistry, Institute of GeochemistryChinese Academy of SciencesGuiyangChina
  2. 2.University of Chinese Academy of SciencesBeijingChina
  3. 3.Limited Company of Jilang Indium IndustriesNandanChina
  4. 4.State Key Laboratory of Isotope Geochemistry, Guangzhou Institute of GeochemistryChinese Academy of SciencesGuangzhouChina
  5. 5.State Key Laboratory of Continental Dynamics, Department of GeologyNorthwest UniversityXi’anChina
  6. 6.GuiyangChina

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