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September 2, 2026Quaternary Science ReviewsOpen Access

Enhanced iron-bound organic carbon preservation on the South China sea slope during the last glacial period and in the basin during the Holocene

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Authors

LSLisha SongLDLiqin DuanJSJinming Song

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Overview

Geochemical sediment analysis reveals divergent iron-bound organic carbon burial across marine slopes and basins, highlighting the role of oxygenation in deep-sea carbon sequestration.

Key Points

  • To investigate temporal shifts and environmental drivers of reactive iron-bound organic carbon preservation across glacial-interglacial cycles in marine slope and basin environments.
  • Analyzed reactive iron, iron-bound organic carbon, and stable carbon isotopes in two marine sediment cores: slope core DZ39 and basin core JW2 from the South China Sea.
  • Evaluated the impact of surface productivity, terrestrial inputs, and sediment redox conditions to calculate the burial flux and total stock of iron-bound organic carbon.
  • In slope core DZ39, the fraction of iron-bound organic carbon averaged 16.8% during the last glacial period, declining to 9.0% during deglaciation and 8.6% during the Holocene.
  • In basin core JW2, the fraction of iron-bound organic carbon shifted from an average of 11.5% during deglaciation to 19.3% in the Holocene, driven by increased oxygenation.
  • The total iron-bound organic carbon stock accumulated in the South China Sea since the last glacial period reached an estimated 21 Pg C.

Cite This Study

Song et al. (2026) studied this question.

synapsesocial.com/papers/6a97e237c562ede874ec6391https://doi.org/10.1016/j.quascirev.2026.110249
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