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<p>Several pulses of ocean oxygenation events were recognized in the Ediacaran period. However, the intrinsic triggers behind them remain ambiguous. Here we report phosphorus speciation data from the Ediacaran Doushantuo Formation, South China, to elucidate the role of recycled phosphorus in driving ocean oxygenation. High ratios of organic carbon to organic phosphorus in all samples relative to the Redfield ratio&#xa0;generally imply preferential release of phosphorus during the remineralization of organic matter. Notably, ratios of organic carbon to reactive phosphorus exceed the Redfield ratio during purported oxygenation intervals, but fall&#xa0;mostly below or close to the Redfield ratio in the rest of the section. Quantitative calculations suggest that enhanced benthic and water-column recycling created a phosphorus influx into the ocean that was comparable to or outpaced that of weathering input. Our study provides empirical evidence for untangling the mechanisms of the Ediacaran oxygenation.</p>

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Enhanced phosphorus regeneration linked to Ediacaran ocean oxygenation

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年6月20日

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  • Dongtao Xu,
  • Xinqiang Wang,
  • Eva E. Stüeken,
  • Weiming Xu,
  • Zheng Qin,
  • Jihua Hao,
  • Xiaoying Shi,
  • Dongjie Tang

摘要

Several pulses of ocean oxygenation events were recognized in the Ediacaran period. However, the intrinsic triggers behind them remain ambiguous. Here we report phosphorus speciation data from the Ediacaran Doushantuo Formation, South China, to elucidate the role of recycled phosphorus in driving ocean oxygenation. High ratios of organic carbon to organic phosphorus in all samples relative to the Redfield ratio generally imply preferential release of phosphorus during the remineralization of organic matter. Notably, ratios of organic carbon to reactive phosphorus exceed the Redfield ratio during purported oxygenation intervals, but fall mostly below or close to the Redfield ratio in the rest of the section. Quantitative calculations suggest that enhanced benthic and water-column recycling created a phosphorus influx into the ocean that was comparable to or outpaced that of weathering input. Our study provides empirical evidence for untangling the mechanisms of the Ediacaran oxygenation.