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Coordination and competition between soil magnetic particles driven by contrary climate development
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  • Yunfeng Cai,
  • Xiaoyong Long,
  • Xianqiang Meng,
  • Junfeng Ji,
  • Yong Wang,
  • Shiyou Xie,
  • Yong Wang
Yunfeng Cai
Southwest University, Southwest University
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Xiaoyong Long
Southwest University, Southwest University

Corresponding Author:[email protected]

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Xianqiang Meng
Chinese Academy of Sciences, Chinese Academy of Sciences
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Junfeng Ji
Nanjing University, Nanjing University
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Yong Wang
Southwest University
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Shiyou Xie
Southwest University, Southwest University
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Yong Wang
Southwest University
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Abstract

The ferrimagnetic (FM) and antiferromagnetic (AFM) particles of iron oxides are considered pedogenic and climatic indicators due to their enrichment with comparable increasing in rainfall and temperature. However, the opposite changes in rainfall and temperature result in rapid change of relative humidity (RH), which could lead to their competition and transformation. We examined two soil sequences undergone contrary climate development on the eastern edge of the Tibetan Plateau. The dry and warm climate with low RH favors the coordinative enrichment of AFM hematite and FM particles, while the wet and cool climate with high RH mainly produces goethite but leads to competition between low content AFM hematite and FM particles. The outcome well interprets the changing relationship between color and magnetism in soils and sediments, and suggests that temperature is as important as precipitation in paleoclimate reconstruction based on iron oxides, especially during strong dry-wet cycles and climate pattern shifts.