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<p>This article comprehensively utilizes trace elements and the physicochemical characteristics of pyrite minerals to quantitatively characterize typical marine shale sedimentary environments. The cores, scanning electron microscope, and XRD whole-rock analyses combined with the information of TOC and fractional porosity are used. The analysis results show that the main types of occurrence of trace elements include granular, agglomerate, banded, cubic, and heteromorphic pyrite. Trace elements framboids particle size statistics show that the Wufeng Formation, Longyi 15 member and Longyi 2 member have larger particle sizes, while other members of Longmaxi Formation have trace elements framboids particle sizes of less than 5 μm. At the same time, it can be observed that the changes in trace element content and ratios in the vertical direction significantly increase the overall retention degree from Long 11 to Longyi 17, with a slow increase in retention degree during the Longyi 11~16 sedimentation period and a rapid increase during the Longyi 17 sedimentation period. All of these indicate that the ancient environment of the Wufeng Formation changed rapidly, and the redox conditions were a sustained weak reducing environment.</p>

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Experimental Analysis on the Geochemical Characteristics of Trace Elements in Typical Shale Marine Environments

  • 期刊论文

  • 发表日期：

    2025年5月1日

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  • Song Wenli,
  • Yang Xiaolu,
  • Xu Qinghai,
  • Song Lizhong,
  • Zeng Fancheng,
  • Zou Xiaopin,
  • Li Jing,
  • Yang Jun,
  • Yang Zhiyu,
  • Xu Haowei

摘要

This article comprehensively utilizes trace elements and the physicochemical characteristics of pyrite minerals to quantitatively characterize typical marine shale sedimentary environments. The cores, scanning electron microscope, and XRD whole-rock analyses combined with the information of TOC and fractional porosity are used. The analysis results show that the main types of occurrence of trace elements include granular, agglomerate, banded, cubic, and heteromorphic pyrite. Trace elements framboids particle size statistics show that the Wufeng Formation, Longyi 15 member and Longyi 2 member have larger particle sizes, while other members of Longmaxi Formation have trace elements framboids particle sizes of less than 5 μm. At the same time, it can be observed that the changes in trace element content and ratios in the vertical direction significantly increase the overall retention degree from Long 11 to Longyi 17, with a slow increase in retention degree during the Longyi 11~16 sedimentation period and a rapid increase during the Longyi 17 sedimentation period. All of these indicate that the ancient environment of the Wufeng Formation changed rapidly, and the redox conditions were a sustained weak reducing environment.