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<p>To elucidate the spatial migration characteristics and driving mechanisms of the mud depocenter along the Zhejiang-Fujian coast during the middle to late Holocene, this study integrates high-resolution shallow seismic profiles (~ 10,000&#xa0;km acquired during 2012–2016) from the Zhejiang coastal area with high-precision AMS ¹⁴C chronostratigraphic data from multiple cores (D02, D03, D05), supplemented by comparative analysis of existing borehole data (e.g., ECS-1302, D12). Results reveal four reflective interfaces (T0, T1, T2, T3) within the Holocene strata, corresponding to the seabed surface, an internal unconformity formed at ~ 2&#xa0;ka, the Holocene maximum flooding surface at ~ 7.7&#xa0;ka, and the Holocene basal boundary, respectively. These interfaces delineate three seismic units: SU3 (early Holocene), SU2 (7.7-2&#xa0;ka), and SU1 (post-2&#xa0;ka). Comparative analysis of SU2 and SU1 isopach maps demonstrates that the mud depocenter migrated northward from the offshore area of the Oujiang River estuary mostly between 27° and 28° N to the coastal region near 29.5° N in Zhejiang around 2&#xa0;ka. During the periods of 7–2&#xa0;ka and 2–0&#xa0;ka, variations in the intensity of Zhe-Min Coastal Current and the upwelling induced by the Kuroshio nearshore branch, along with shifts in the frontal position resulting from their interaction, led to the migration of the depositional center. Concurrently, Yangtze River Delta evolution and anthropogenic activities may have contributed to increased sedimentation rates. This study provides insights into the response of East Asian marginal sea depositional systems to late Holocene environmental perturbations, and offers a historical case for evaluating the Anthropocene synergy between human activities and natural processes.</p>

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Migration of the post-middle holocene mud depocenter off the Zhejiang coast around 2 ka and its controlling mechanism

  • 期刊论文

  • 发表日期：

    2026年2月4日

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  • Jiandong Qiu,
  • Jian Liu,
  • Rongrong Cheng,
  • Yoshiki Saito,
  • Ang Li,
  • Ke Cao,
  • Yuan Tian,
  • Bin Chen,
  • Zhe Xu,
  • Meina Li

摘要

To elucidate the spatial migration characteristics and driving mechanisms of the mud depocenter along the Zhejiang-Fujian coast during the middle to late Holocene, this study integrates high-resolution shallow seismic profiles (~ 10,000 km acquired during 2012–2016) from the Zhejiang coastal area with high-precision AMS ¹⁴C chronostratigraphic data from multiple cores (D02, D03, D05), supplemented by comparative analysis of existing borehole data (e.g., ECS-1302, D12). Results reveal four reflective interfaces (T0, T1, T2, T3) within the Holocene strata, corresponding to the seabed surface, an internal unconformity formed at ~ 2 ka, the Holocene maximum flooding surface at ~ 7.7 ka, and the Holocene basal boundary, respectively. These interfaces delineate three seismic units: SU3 (early Holocene), SU2 (7.7-2 ka), and SU1 (post-2 ka). Comparative analysis of SU2 and SU1 isopach maps demonstrates that the mud depocenter migrated northward from the offshore area of the Oujiang River estuary mostly between 27° and 28° N to the coastal region near 29.5° N in Zhejiang around 2 ka. During the periods of 7–2 ka and 2–0 ka, variations in the intensity of Zhe-Min Coastal Current and the upwelling induced by the Kuroshio nearshore branch, along with shifts in the frontal position resulting from their interaction, led to the migration of the depositional center. Concurrently, Yangtze River Delta evolution and anthropogenic activities may have contributed to increased sedimentation rates. This study provides insights into the response of East Asian marginal sea depositional systems to late Holocene environmental perturbations, and offers a historical case for evaluating the Anthropocene synergy between human activities and natural processes.