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This study focuses on the Liangshan Formation in Chongqing to clarify element migration during intense weathering and its role in bauxite genesis. A well-preserved lateritic profile, resting on Carboniferous Huanglong limestone and passing upward into claystone, aluminous claystone and finally bauxite, was investigated in south-eastern Chongqing. Systematic sampling, whole-rock geochemistry and the isocon mass-balance approach reveal a continuous, albeit decreasing, net mass loss along the weathering sequence. Lithium is markedly enriched in the claystone horizon but remains steady in the aluminous claystone and bauxite intervals. Combined with the Chemical Index of Alteration (CIA), the results quantify the strengthening then stabilising weathering intensity and provide a robust framework for deciphering bauxite-forming processes and the palaeo-depositional environment of the region.

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Analysis of Key-Element Migration in the Liangshan Bauxite–Lithium Horizon Under Extreme Weathering

  • 会议论文

  • 发表日期：

    2026年

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  • Zongwang Yi,
  • Jie Gou,
  • Chunsheng Lei,
  • Yu Guo,
  • Li Dong,
  • Qing Zhou,
  • Jiajia Mu,
  • Qinjian Ma,
  • Tian Li,
  • Pengfei Ma

摘要

This study focuses on the Liangshan Formation in Chongqing to clarify element migration during intense weathering and its role in bauxite genesis. A well-preserved lateritic profile, resting on Carboniferous Huanglong limestone and passing upward into claystone, aluminous claystone and finally bauxite, was investigated in south-eastern Chongqing. Systematic sampling, whole-rock geochemistry and the isocon mass-balance approach reveal a continuous, albeit decreasing, net mass loss along the weathering sequence. Lithium is markedly enriched in the claystone horizon but remains steady in the aluminous claystone and bauxite intervals. Combined with the Chemical Index of Alteration (CIA), the results quantify the strengthening then stabilising weathering intensity and provide a robust framework for deciphering bauxite-forming processes and the palaeo-depositional environment of the region.