Climate and anthropogenic impacts on North American erosion and sediment transport since the Last Glacial Maximum: evidence from the detrital zircon record of the Lower Mississippi Valley, USA
- Neubeck, N.
- Carter, Andrew
- Rittenour, T.
- Clift, P.D.
DOIAbstract
The Mississippi River provides an opportunity to examine models of sediment transport in large alluviated floodplain systems. We test the idea that sources of sandy sediment in such settings are invariable on timescales <104 y because of storage and recycling in the floodplains. To reconstruct the development of the Mississippi sediment load over the past 2500 years we collected sediment from an abandoned point bar complex nearby at False River, Louisiana, USA. We also took annual samples from the lower reaches between 2015 and 2021 to assess changes on that timescale. Optically stimulated luminescence dating indicated that the point bar accreted between 2460 and 860 years ago. Detrital zircon U-Pb dating was used to assess sediment source ...
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