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<p>Aeolian deposits across the Yarlung Zangbo River Basin on the southern Tibetan Plateau record the landscape and atmospheric evolution of Earth’s Third Pole. The complex mountain-basin system exhibits nonlinear responses to climate forcing, complicating the interpretation of its high-altitude environmental dynamics. Investigating the magnetic enhancement mechanism of aeolian deposits offers an opportunity to decipher climate signals. Our analysis of three aeolian sections from the basin indicates that magnetic minerals are predominantly low-coercivity ferrimagnetic minerals, and grain sizes fine from upper to lower reaches due to climate shifts from arid to humid. Magnetic enhancement in the upper reaches primarily originates from dust input, while dust input and pedogenesis contribute variably over time in the middle and lower reaches. Similar complex patterns occur in the Ili basin, a mountain-basin system in northwestern China. They differ from the Chinese Loess Plateau, where long-distance-transported dust is well-mixed and the pedogenic enhancement model is applied, and desert peripheries where short-distance dust is transported and the dust input model is applied. We summarize the magnetic enhancement mechanisms in various settings and offer a new framework for applying magnetic techniques in paleoclimate reconstruction within global mountain-basin systems, which highlights the need for caution in interpreting their magnetic susceptibility records.</p>

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Spatiotemporal heterogeneity of magnetic enhancement mechanisms in aeolian deposits on the southern Tibetan Plateau: Implications for paleoclimatic reconstruction in mountain-basin systems

  • 期刊论文

  • 发表日期：

    2026年1月28日

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  • Haoyu Wang,
  • Junhuai Yang,
  • Wenxi Qu,
  • Linkai Wang,
  • Canyi Zhang,
  • Xin Liu,
  • Jinmeng Tang,
  • Fuyuan Gao,
  • Zixuan Chen,
  • Shuyuan Wang,
  • Yijiao Fan,
  • Duo Wu

摘要

Aeolian deposits across the Yarlung Zangbo River Basin on the southern Tibetan Plateau record the landscape and atmospheric evolution of Earth’s Third Pole. The complex mountain-basin system exhibits nonlinear responses to climate forcing, complicating the interpretation of its high-altitude environmental dynamics. Investigating the magnetic enhancement mechanism of aeolian deposits offers an opportunity to decipher climate signals. Our analysis of three aeolian sections from the basin indicates that magnetic minerals are predominantly low-coercivity ferrimagnetic minerals, and grain sizes fine from upper to lower reaches due to climate shifts from arid to humid. Magnetic enhancement in the upper reaches primarily originates from dust input, while dust input and pedogenesis contribute variably over time in the middle and lower reaches. Similar complex patterns occur in the Ili basin, a mountain-basin system in northwestern China. They differ from the Chinese Loess Plateau, where long-distance-transported dust is well-mixed and the pedogenic enhancement model is applied, and desert peripheries where short-distance dust is transported and the dust input model is applied. We summarize the magnetic enhancement mechanisms in various settings and offer a new framework for applying magnetic techniques in paleoclimate reconstruction within global mountain-basin systems, which highlights the need for caution in interpreting their magnetic susceptibility records.