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<p>The Early Aptian Oceanic Anoxic Event 1a (OAE 1a) marks a period of global marine anoxia linked to volcanic activity and climate changes during the Cretaceous. This study analyzes a ~ 40-m-thick Lower Aptian succession from the Kazhdumi Intrashelf Basin, Iran, using I/(Ca + Mg) ratios, Ce anomalies, trace elements, δ¹³C, and REY parameters. Results reveal persistent suboxic to anoxic bottom-water conditions, with increased oxygenation in segments C3 and upper C5 + C6, driven by weathering and sea-level changes. Minimal diagenetic overprinting is indicated by C-isotope trends and low Mn/Sr ratios. The Kazhdumi Basin serves as a high-resolution archive of redox evolution during OAE 1a, emphasizing the utility of I/(Ca + Mg) and Ce anomalies as proxies in ancient carbonates.</p>

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Cerium anomalies and iodine track nonuniform paleoredox conditions during the Aptian Oceanic Anoxic Event 1a

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年7月3日

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  • Arman Jafarian,
  • Antun Husinec,
  • Ardiansyah Koeshidayatullah,
  • Xi Chen,
  • Meng Wang,
  • Clemens Vinzenz Ullmann,
  • Abdus Saboor,
  • Kaibo Han,
  • Chengshan Wang

摘要

The Early Aptian Oceanic Anoxic Event 1a (OAE 1a) marks a period of global marine anoxia linked to volcanic activity and climate changes during the Cretaceous. This study analyzes a ~ 40-m-thick Lower Aptian succession from the Kazhdumi Intrashelf Basin, Iran, using I/(Ca + Mg) ratios, Ce anomalies, trace elements, δ¹³C, and REY parameters. Results reveal persistent suboxic to anoxic bottom-water conditions, with increased oxygenation in segments C3 and upper C5 + C6, driven by weathering and sea-level changes. Minimal diagenetic overprinting is indicated by C-isotope trends and low Mn/Sr ratios. The Kazhdumi Basin serves as a high-resolution archive of redox evolution during OAE 1a, emphasizing the utility of I/(Ca + Mg) and Ce anomalies as proxies in ancient carbonates.