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<p>How mantle redox state developed, particularly the mantle source associated with mid-ocean ridge-like settings, remains a subject of ongoing debate. Here, we employ thermodynamic-thermomechanical numerical simulations to explore the redox properties of melts formed under mid-ocean ridge-like settings in both Archean and modern conditions. By comparing these results with a global database of mid-ocean&#xa0;ridge-like rocks extending back to 3.8 Ga, we reconstruct the mantle’s redox evolution since the early Archean. Using the whole-rock Fe³⁺/ΣFe ratio as a robust redox proxy, derived from integrated numerical modeling and thermodynamic inversion, we find that the mantle’s average Fe³⁺/ΣFe ratio has approximately doubled since the early Archean. Our calculations further indicate that ultra-low-oxygen-fugacity mantle domains in modern oceanic lithosphere reflect an initially reduced origin rather than deeper or hotter melting. Our results suggest that Earth’s oxygenation and tectono-magmatic evolution may have been coupled.</p>

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The Mantle Fe3+/ΣFe Ratio Has Doubled Since the Early Archean

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年1月14日

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  • Xiao-Xi Zhu,
  • Wen-Yong Duan,
  • Taras Gerya,
  • Xin Zhou,
  • Jia-Cheng Tian

摘要

How mantle redox state developed, particularly the mantle source associated with mid-ocean ridge-like settings, remains a subject of ongoing debate. Here, we employ thermodynamic-thermomechanical numerical simulations to explore the redox properties of melts formed under mid-ocean ridge-like settings in both Archean and modern conditions. By comparing these results with a global database of mid-ocean ridge-like rocks extending back to 3.8 Ga, we reconstruct the mantle’s redox evolution since the early Archean. Using the whole-rock Fe³⁺/ΣFe ratio as a robust redox proxy, derived from integrated numerical modeling and thermodynamic inversion, we find that the mantle’s average Fe³⁺/ΣFe ratio has approximately doubled since the early Archean. Our calculations further indicate that ultra-low-oxygen-fugacity mantle domains in modern oceanic lithosphere reflect an initially reduced origin rather than deeper or hotter melting. Our results suggest that Earth’s oxygenation and tectono-magmatic evolution may have been coupled.