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Purpose <p>The main goal of the study was to determine the influence of the intensive deposition of fine sediment in the settlement period on changes in the chemical composition of the Congaree floodplain deposits.</p> Methods <p>Floodplain sediment samples collected by coring were subjected to inductively coupled plasma mass spectrometry with Integrated Collision Reaction Cell (ICP(iCRC)MS) to determine concentrations of chemical elements at various depths and types of deposits.</p> Results <p>Our study reveals that the geochemical signature of the upper part of the Congaree floodplain (named as VA + facies), formed during the last over 200&#xa0;years, differs from the geochemical patterns of point bar (PB), channel fill (CH) and vertical accretion (VA) sediments formed prior to the settlement period. The PB, CH and VA environments are geochemically closely connected owing to point bar formation, followed by eroding and reworking by floods, and important role of vertical accretion in the formation of channel fills. The VA + deposits constitute the upper 0.7&#xa0;m of the Congaree floodplain and are characterized by two- and three-fold increases in contents of Mn, Zn, Cr, Pb, Ni, Rb, Co, Fe and Rare Earth Elements (REE) compared to the underlying part of the floodplain.</p> Conclusion <p>The VA + deposits mark the period of increased deforestation and increased accumulation of fines (legacy deposits) in the Congaree River valley during the last over 200&#xa0;years. We hypothesize that our findings may be applicable also to other river valleys of the Atlantic Coastal Plain affected by the intensive sedimentation in the settlement period.</p>

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Human-induced deposition of fine sediment changes geochemical features of floodplain deposits (the Congaree River, Atlantic Coastal Plain, USA)

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年6月22日

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  • Marcin Słowik,
  • Przemysław Niedzielski,
  • Aleksandra Proch,
  • George Starega

摘要

Purpose

The main goal of the study was to determine the influence of the intensive deposition of fine sediment in the settlement period on changes in the chemical composition of the Congaree floodplain deposits.

Methods

Floodplain sediment samples collected by coring were subjected to inductively coupled plasma mass spectrometry with Integrated Collision Reaction Cell (ICP(iCRC)MS) to determine concentrations of chemical elements at various depths and types of deposits.

Results

Our study reveals that the geochemical signature of the upper part of the Congaree floodplain (named as VA + facies), formed during the last over 200 years, differs from the geochemical patterns of point bar (PB), channel fill (CH) and vertical accretion (VA) sediments formed prior to the settlement period. The PB, CH and VA environments are geochemically closely connected owing to point bar formation, followed by eroding and reworking by floods, and important role of vertical accretion in the formation of channel fills. The VA + deposits constitute the upper 0.7 m of the Congaree floodplain and are characterized by two- and three-fold increases in contents of Mn, Zn, Cr, Pb, Ni, Rb, Co, Fe and Rare Earth Elements (REE) compared to the underlying part of the floodplain.

Conclusion

The VA + deposits mark the period of increased deforestation and increased accumulation of fines (legacy deposits) in the Congaree River valley during the last over 200 years. We hypothesize that our findings may be applicable also to other river valleys of the Atlantic Coastal Plain affected by the intensive sedimentation in the settlement period.