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<p>The environmental magnetic proxies of stalagmites hold significant potential for reconstructing regional hydroclimate changes by revealing the content and grain size of magnetic particles within stalagmites. In this study, we present the contents and grain sizes of magnetic particles within a stalagmite SZ-1, from Shizhu Cave in southwestern China from 70.4 to 22.3 thousand years ago (ka) during the last glacial period. Specifically, the parameters IRM<sub>soft</sub>, soil-derived magnetic minerals, and ARM/SIRM (anhysteretic remanent magnetization/saturation isothermal remanent magnetization), the ratio of fine magnetic particles to total ferrimagnetic particles preserved in stalagmite SZ-1, indicate the fluctuation of regional precipitation. Obvious half-precessional cycles are evident in these two proxies, indicating that hydroclimatic variations in southwestern China may predominantly arise from the heat and moisture transported from tropical oceans. These variations are likely influenced by shifts in the Intertropical Convergence Zone and fluctuations in the Asian Summer Monsoon.</p>

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Half-Precessional Cycle Revealed by Environment Magnetism of Stalagmite in Shizhu Cave from Southwestern China during the Last Glacial

  • 期刊论文

  • 发表日期：

    2025年6月17日

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  • Huihui Yang,
  • Yu-Min Chou,
  • Xiuyang Jiang,
  • Wenyue Xia,
  • Hai Li,
  • Yi Zhong,
  • Jingyu Zhang,
  • Yaoqi He,
  • Tsai-Luen Yu,
  • Qingsong Liu,
  • Chuan-Chou Shen

摘要

The environmental magnetic proxies of stalagmites hold significant potential for reconstructing regional hydroclimate changes by revealing the content and grain size of magnetic particles within stalagmites. In this study, we present the contents and grain sizes of magnetic particles within a stalagmite SZ-1, from Shizhu Cave in southwestern China from 70.4 to 22.3 thousand years ago (ka) during the last glacial period. Specifically, the parameters IRMsoft, soil-derived magnetic minerals, and ARM/SIRM (anhysteretic remanent magnetization/saturation isothermal remanent magnetization), the ratio of fine magnetic particles to total ferrimagnetic particles preserved in stalagmite SZ-1, indicate the fluctuation of regional precipitation. Obvious half-precessional cycles are evident in these two proxies, indicating that hydroclimatic variations in southwestern China may predominantly arise from the heat and moisture transported from tropical oceans. These variations are likely influenced by shifts in the Intertropical Convergence Zone and fluctuations in the Asian Summer Monsoon.