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Coordination and competition between magnetic particles driven by opposite climate transitions
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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 to be pedogenic and climatic indicators in soil taxonomy and paleoclimate reconstruction due to their enrichment trends as a function of increasing rainfall and temperature. However, opposite climate can retard chemical weathering but promote significant transformation between iron oxides, which could account for a nonlinear response of magnetism and color to extreme climate. We examined two soil sequences undergone opposite climate on the eastern edge of the Tibetan Plateau. The dry and warm climate transition favors the dehydration of amorphous iron oxides to form AFM hematite and FM particles, while the wet and cool climate transition impedes the formation but leads to their competition. The outcome well interprets the synchronous and asynchronous changes in color and magnetism under extreme opposite climate, and suggests that evaporation is as important as precipitation in extreme paleoclimate reconstructions based on iron oxides.