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<p>This study investigates differently colored travertines (red, yellow, black, and white) from the Shenxianchi scenic spot using multi-technique characterization to analyze their mineralogical characteristics. SEM images reveal that YT, RT, and BT exhibit irregular calcite morphologies with surface coatings of clay minerals or organic matter, while WT comprises high-purity, well-formed calcite. EDS and XRF results show significant variation in Ca, Si, Fe, and Al contents among samples, with Fe enrichment in YT and RT. PLM images indicate the presence of Fe(OH)<sub>3</sub> colloids in these samples, consistent with local geochemical conditions that favor colloid formation. IR and Raman spectra confirm typical CO<sub>3</sub><sup>2−</sup> absorption bands in all samples, and broad bands between 2900 and 3500&#xa0;cm<sup>− 1</sup> indicate the presence of O-H vibrations and organic functional groups. These findings clarify mineralogical differences and suggest that Fe(OH)<sub>3</sub> colloids and clay minerals are key chromogenic factors in YT and RT, while black coloration relates to organic matter oxidation. This study provides a scientific basis for ecological restoration and supports further research on travertine formation and color evolution in karst environments.</p>

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Research on the mineralogical characteristics and color formation mechanisms of different colored travertine in the Shenxianchi scenic spot: a comprehensive analysis using multi-technique characterization

  • 期刊论文

  • 发表日期：

    2025年5月26日

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  • Jiyu Tang,
  • Wenhao Gao,
  • Xinze Liu,
  • Qingle Zeng,
  • Dong Sun,
  • Yongping Tan,
  • Hao Jiang,
  • Zhipeng Zhang,
  • Shupu Liu

摘要

This study investigates differently colored travertines (red, yellow, black, and white) from the Shenxianchi scenic spot using multi-technique characterization to analyze their mineralogical characteristics. SEM images reveal that YT, RT, and BT exhibit irregular calcite morphologies with surface coatings of clay minerals or organic matter, while WT comprises high-purity, well-formed calcite. EDS and XRF results show significant variation in Ca, Si, Fe, and Al contents among samples, with Fe enrichment in YT and RT. PLM images indicate the presence of Fe(OH)3 colloids in these samples, consistent with local geochemical conditions that favor colloid formation. IR and Raman spectra confirm typical CO32− absorption bands in all samples, and broad bands between 2900 and 3500 cm− 1 indicate the presence of O-H vibrations and organic functional groups. These findings clarify mineralogical differences and suggest that Fe(OH)3 colloids and clay minerals are key chromogenic factors in YT and RT, while black coloration relates to organic matter oxidation. This study provides a scientific basis for ecological restoration and supports further research on travertine formation and color evolution in karst environments.