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Acta Geochimica

, Volume 38, Issue 1, pp 78–94 | Cite as

The metallogenic environment of the Dounan manganese deposit, Southeast Yunnan, China: evidence from geochemistry and Mössbauer spectroscopic

  • Jianbing Duan
  • Yazhou FuEmail author
  • Zhengwei Zhang
  • Xiangxian Ma
  • Jiafei Xiao
Original Article
  • 40 Downloads

Abstract

The Dounan manganese deposit is a typical large-scale marine sedimentary manganese deposit of the Middle Triassic in China. The metallogenic environment and change process directly dictate the migration, enrichment, and precipitation of Mn. To better understand its metallogenetic environment, a detailed study was undertaken involving field observation, mineralogical and geochemical and Mössbauer spectroscopic analyses. The major findings are as follows: (1) Lithofacies paleogeography, sedimentary structural characteristics, and geochemical indexes indicate that the deposits were formed in an epicontinental marine sedimentary basin environment of normal salinity; (2) there were three ore phases including Mn oxides, Mn carbonates, and mixed Mn ores. The ore minerals found were braunite, manganite, Ca-rhodochrosite, manganocalcite, and kutnahorite. Petrographic and mineralogical information indicates that the metallogenic environment was a weakly alkaline and weakly oxidized to weakly reduced environment, and the mineralization occurred near the redox interface; (3) the V/(V + Ni) ratios, δCe and Fe2+/Fe3+ found in profiles of Baigu and Gake ore sections show that the redox conditions of the ore-forming environment were continuously changing; and (4) three Fe species, α-Fe2O3, para-Fe3+, and para-Fe2+, were found in hematite and clay mineral samples using Mössbauer spectrum analysis. The presence and distribution of these Fe species indicate that the deposit was formed in a typical sedimentary environment during the mineralization process. In summary, our study showed that redox was a key factor controlling the mineralization of the Dounan manganese deposit. Our results have led us to the conclusion that transgression and regression caused fluctuations in sea level, which in turn caused the change of the redox environment. Mössbauer spectroscopy is an effective tool for studying the redox conditions of the paleoenvironment in which sedimentary manganese deposits were formed.

Keywords

Dounan manganese deposit Metallogenetic environment Mössbauer spectroscopy Geochemistry 

Notes

Acknowledgements

The authors are grateful to Engineer Li Chao (Yunnan Wenshan Dounan Manganese Industry Co., Ltd.) for his help toward collecting field geological samples, and Professor Zheng Guodong (Key Laboratory of Petroleum Resources Research, Institute of Geology and Geophysics, Chinese Academy of Sciences) for testing and analyzing these samples. This research was financially supported by the Natural Science Foundation of China (NSFC No. 41376080) and the 12th Five-Year Plan project of the State Key Laboratory of Ore-deposit Geochemistry, Chinese Academy of Sciences (SKLODG-ZY125-08).

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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

  • Jianbing Duan
    • 1
    • 3
  • Yazhou Fu
    • 1
    Email author
  • Zhengwei Zhang
    • 1
  • Xiangxian Ma
    • 2
  • Jiafei Xiao
    • 1
  1. 1.State Key Laboratory of Ore Deposit Geochemistry, Institute of GeochemistryChinese Academy of SciencesGuiyangChina
  2. 2.Key Laboratory of Petroleum Resources, Gansu Province; Key Laboratory of Petroleum Resources Research, Institute of Geology and GeophysicsChinese Academy of SciencesLanzhouChina
  3. 3.University of Chinese Academy of SciencesBeijingChina

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