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<p>The coastal to inner-shelf muddy belt and offshore tidal sand ridges of the East China Sea (ECS) constitute a coupled sedimentary pattern during the postglacial deposition, challenging the prevailing paradigm of seaward, unidirectional dispersal of sedimentary organic carbon (OC) in coastal to shelf regions worldwide. Here we investigate characteristics and temporal heterogeneity of diverse sedimentary OC in specific depositional environments during the past 14 kyr based on dual carbon isotopes (<sup>13</sup>C and <sup>14</sup>C) and multi-biomarkers in sediment core ECS-1302 of the muddy belt. Sedimentary OC-<sup>14</sup>C ages deviated anomalously from their depositional ages during the postglacial transgression, alongside a decreasing proportion of terrestrial OC, supporting energetic forcing reintroduced pre-aged OC from offshore into coastal to inner-shelf areas, associating with shoreward, fine-grained sediment reworking of the paleo-Yangtze River estuary. This study underscores dual-directional cycles of sedimentary OC should be fully considered in exploring carbon cycle for large river- and tide-dominated marginal seas.</p>

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Neglected shoreward reintroduction of pre-aged sedimentary organic carbon in a large river- and tide-dominated marginal sea

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年5月20日

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  • Lilei Chen,
  • Feng Li,
  • Jian Liu,
  • Yoshiki Saito,
  • Shuwen Sun,
  • Jiandong Qiu,
  • Xingliang He,
  • Bin Chen,
  • Gang Tong,
  • Maogang Qin

摘要

The coastal to inner-shelf muddy belt and offshore tidal sand ridges of the East China Sea (ECS) constitute a coupled sedimentary pattern during the postglacial deposition, challenging the prevailing paradigm of seaward, unidirectional dispersal of sedimentary organic carbon (OC) in coastal to shelf regions worldwide. Here we investigate characteristics and temporal heterogeneity of diverse sedimentary OC in specific depositional environments during the past 14 kyr based on dual carbon isotopes (13C and 14C) and multi-biomarkers in sediment core ECS-1302 of the muddy belt. Sedimentary OC-14C ages deviated anomalously from their depositional ages during the postglacial transgression, alongside a decreasing proportion of terrestrial OC, supporting energetic forcing reintroduced pre-aged OC from offshore into coastal to inner-shelf areas, associating with shoreward, fine-grained sediment reworking of the paleo-Yangtze River estuary. This study underscores dual-directional cycles of sedimentary OC should be fully considered in exploring carbon cycle for large river- and tide-dominated marginal seas.