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Different enrichment patterns of pedogenic magnetic particles modulated by primary iron-phosphorous input
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  • Juan Ren,
  • Xiaoyong Long,
  • Junfeng Ji,
  • Vidal Barrón,
  • José Torrent,
  • Yong Wang,
  • Shiyou Xie
Juan Ren
Southwest University
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Xiaoyong Long
School of Geographical Sciences, Southwest University

Corresponding Author:[email protected]

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Junfeng Ji
Nanjing University
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Vidal Barrón
Departamento de Agronomía
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José Torrent
Universidad de Córdoba
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Yong Wang
Southwest University
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Shiyou Xie
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Magnetic particles including ferrimagnetic (FM) and antiferromagnetic (AFM) particles are ubiquitous in the surface of Earth and Mars. The FM particles dominating soil magnetism usually coexist or compete with AFM hematite due to their comparable thermodynamic stability. The uncertain correlation can be modulated by phosphorous (P) absorption during aging of precursor amorphous iron (Fe) oxides. We investigated two Ferralsol sequences around a P mining field with comparable content of hematite but contrasting P/Fe ratio. The FM particles accompanying the formation of hematite are enriched stably at accelerating rates under high P/Fe but at unstably even rates under low P/Fe. The FM particles became less abundant and coarser while the iron oxide crystallinity increased monotonically as P/Fe decreased. We attribute it to more rapid grain growth of FM particles and transformation into hematite without P retarding the crystallization of iron oxides.
28 Nov 2020Published in Geophysical Research Letters volume 47 issue 22. 10.1029/2020GL090439