Early to mid‐<scp>H</scp>olocene rapid sea‐level rise and coastal response on the southern Yangtze delta plain, China

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  • ZHANGHUA WANG
    State Key Laboratory of Estuarine and Coastal Research East China Normal University Shanghai 200062 China
  • QING ZHAN
    Shanghai Geological Survey Shanghai China
  • HAIYAN LONG
    College of Marine Geoscience Ocean University of China Qingdao China
  • YOSHIKI SAITO
    Geological Survey of Japan AIST Tsukuba Ibaraki Japan
  • XIAOQIN GAO
    State Key Laboratory of Estuarine and Coastal Research East China Normal University Shanghai 200062 China
  • XUXU WU
    State Key Laboratory of Estuarine and Coastal Research East China Normal University Shanghai 200062 China
  • LIN LI
    State Key Laboratory of Estuarine and Coastal Research East China Normal University Shanghai 200062 China
  • YANAN ZHAO
    State Key Laboratory of Estuarine and Coastal Research East China Normal University Shanghai 200062 China

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<jats:title>ABSTRACT</jats:title><jats:sec><jats:label /><jats:p>We used accelerator mass spectrometry (AMS) <jats:sup>14</jats:sup>C‐dated sediments of the Holocene basal supratidal flat to upper tidal flat facies in 11 cores on the southern Yangtze delta plain to reconstruct relative sea levels of 8.5–8.0 cal ka BP. Three cores were further AMS <jats:sup>14</jats:sup>C dated and used to examine the evolution of sedimentary geomorphological environments in response to the rapid sea‐level rise during the early to mid‐Holocene. Results demonstrate relative sea‐level rise of around 30 mm a<jats:sup>−1</jats:sup> from 8.5 to 8.3 cal ka BP and around 10 mm a<jats:sup>−1</jats:sup> from 8.3 to 8.0 cal ka BP. Retrogradation from supratidal to lower tidal flat environments occurred in response to the rapid sea‐level rise at 8.5–8.3 cal ka BP, and aggradation from middle to upper tidal flat occurred at 8.3–7.9 cal ka BP. Further retreat of the tidal flat at 7.9–7.2 cal ka BP implies a mean sea‐level rise rate exceeding 5 mm a<jats:sup>−1</jats:sup> at this time. We suggest that the rapid relative sea‐level rise during 8.3–8.5 cal ka BP and subsequent slower rise caused drastic changes in the coastal zone and that these changes are key phenomena for understanding the coastal response to future sea‐level rise.</jats:p></jats:sec>

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