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中国科技核心期刊

地学领域高质量科技期刊分级T2区（2023）

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Volume 42 Issue 6
Nov.  2023
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Article Contents
Article Navigation >  Bulletin of Geological Science and Technology  > 2023  >  42(6): 201-214
Wang Yuhang, Xie Hong, Zhang Lan, Wang Changjian, Lu Zhenghao, Bai Yang, Wang Mengzhai. Constraints of sedimentary environment on phosphorization of phosphorus-bearing rock series in the Xinhua Gezhongwu Formation, Zhijin County, Guizhou Province[J]. Bulletin of Geological Science and Technology, 2023, 42(6): 201-214. doi: 10.19509/j.cnki.dzkq.tb20220204
Citation: Wang Yuhang, Xie Hong, Zhang Lan, Wang Changjian, Lu Zhenghao, Bai Yang, Wang Mengzhai. Constraints of sedimentary environment on phosphorization of phosphorus-bearing rock series in the Xinhua Gezhongwu Formation, Zhijin County, Guizhou Province[J]. Bulletin of Geological Science and Technology, 2023, 42(6): 201-214. doi: 10.19509/j.cnki.dzkq.tb20220204
shu

Constraints of sedimentary environment on phosphorization of phosphorus-bearing rock series in the Xinhua Gezhongwu Formation, Zhijin County, Guizhou Province

doi: 10.19509/j.cnki.dzkq.tb20220204
  • 1a.

    College of Resource and Environmental Enginerring, Guizhou University, Guiyang 550025, China

  • 1b.

    Key Laboratory of Karst Georesources and Environment of Ministry of Education, Guizhou University, Guiyang 550025, China

  • 2.

    School of Earth Sciences, Lanzhou University, Lanzhou 730000, China

  • Received Date: 09 May 2022
  • Accepted Date: 20 Sep 2022
  • Rev Recd Date: 17 Sep 2022
    Abstract
  • Objective

    The Early Cambrian superlarge rare earth-rich phosphate deposit in Xinhua, Zhijin County, Guizhou Province, is a typical marine sedimentary deposit. There have long been controversial on the mineralisation environment and mineralisation mechanism.

    Methods

    In this paper, the sedimentary environment and formation mechanism of the phosphorus-bearing rock series in the Gezhongwu Formation are verified, through the study of the microscopic characteristics of phosphorus-bearing rock series rocks or ores and the evidence of elemental geochemistry.

    Results

    This study reveal the regular changes in the structure of phosphorite from the bottom up of the phosphorous-bearing rock series: the grain sizes decreasing; the interstitial materials between grains vary from bright dolomite cement to micritic matrix, such as siliceous and collophanite, followed by bright dolomite cement and finally micrite collophanite and siliceous. The cementation mode has mainly converted from pore cementation to pore-based cementation, and the supports change from grain to grain-matrix supports. Moreover, the single layers of the rocks become thinner and darker, and the development of staggered bedding was decreased.

    Conclusion

    These characteristics reflect that the sedimentary environment of the phosphorus-bearing rock series is a subtidal zone with strong hydrodynamic forces, and of the upper section has sedimentary depths higher and hydrodynamic conditions slightly weaker than those of the lower section. The significant negative Ce anomalies (δCe between 0.32-0.39) and low Ni/Co (0.98-6.07) and V/Cr ratios (0.57-12.50) of the phosphorus-bearing rock series show that the sedimentary water had oxidation characteristics similar to those of a modern marine environment. The lower 103·Sr/Ca(2.00-3.38) and 1/Σ(Al2O3+TiO2) ratios (0.57-3.45) indicate that the ancient water depth was generally shallow, but the relative depth changed frequently. The distribution characteristics of Fe, Cu and Ba contents indicate that the palaeoproductivity of carbonate in the lower section is higher than that in the upper section. In the palaeoenvironment where various conditions are coupled, the phosphorite was finally enriched and formed by precipitation-stirring-subdivision-cementation-solidification.

     

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