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<p>To investigate the effects of climate change and human activities on land-sea interactions, this research studied the shifts in sediment provenance of the East China Sea inner shelf mud wedge over the past 1500 years, utilizing clay mineralogy and Sr-Nd isotopic analyses. The findings indicate a predominant contribution from the Yangtze River, with minor inputs from small rivers along the Fujian and Zhejiang coasts. Notably, there was a marked increase in Yangtze River sediment contribution beginning around 1100 yr BP, coinciding with reduced precipitation that diminished sediment supply from southeastern coastal rivers. From 1100 to 730 yr BP, fluctuations in precipitation played a dominant role in controlling the relative contributions of different sediment sources to the inner-shelf mud wedge. However, starting around <i>ca</i>. 730 yr BP, the clay mineral assemblages observed in Core SS4 sediments were primarily influenced by climate-driven weathering processes. Unlike detrital minerals, the clay mineral composition in Core SS4 did not retain a discernible signal of intensified human activities around this time. These findings underscore the importance of employing multi-proxy approaches to disentangle natural and anthropogenic controls on sediment dynamics in marginal seas.</p>

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Sediment Provenance Shifts in the East China Sea Inner Shelf Since 1500 yr BP: Enhanced Yangtze River Contributions Driven by Climate

  • 期刊论文

  • 发表日期：

    2026年5月9日

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  • Kaidi Zhang,
  • Anchun Li,
  • Jiang Dong,
  • Xiting Liu,
  • Jian Lu,
  • Jin Zhang,
  • Changfu Zhou,
  • Zhaojun Song

摘要

To investigate the effects of climate change and human activities on land-sea interactions, this research studied the shifts in sediment provenance of the East China Sea inner shelf mud wedge over the past 1500 years, utilizing clay mineralogy and Sr-Nd isotopic analyses. The findings indicate a predominant contribution from the Yangtze River, with minor inputs from small rivers along the Fujian and Zhejiang coasts. Notably, there was a marked increase in Yangtze River sediment contribution beginning around 1100 yr BP, coinciding with reduced precipitation that diminished sediment supply from southeastern coastal rivers. From 1100 to 730 yr BP, fluctuations in precipitation played a dominant role in controlling the relative contributions of different sediment sources to the inner-shelf mud wedge. However, starting around ca. 730 yr BP, the clay mineral assemblages observed in Core SS4 sediments were primarily influenced by climate-driven weathering processes. Unlike detrital minerals, the clay mineral composition in Core SS4 did not retain a discernible signal of intensified human activities around this time. These findings underscore the importance of employing multi-proxy approaches to disentangle natural and anthropogenic controls on sediment dynamics in marginal seas.