Using soil geochemistry to map historic and late Holocene floodplains, Four Mile Creek, Ohio
2023
Hochschulschrift
Zugriff:
Fluvial terraces are vital to reconstructing past depositional dynamics within a watershed as well as determining flood and erosion risk. In the midwestern US, detailed mapping of terrace age is necessary to determine if deposition occurred during multiple distinct periods. In this study, changes to soil geochemistry over time were quantified from nine radiocarbon-dated soils spanning ~17,000 years and this relationship was used to infer soil age across a broad fluvial terrace. Regression models quantifying Fe/Ca, Zr/Ca, and Ti/Ca changes at multiple soil depths were created. Fe/Ca models returned R2 values between 0.69 and 0.97 with the lowest uncertainties compared to Zr/Ca and Ti/Ca models. Samples collected at 20-30 cm depth resulted in the highest correlation coefficient compared to samples collected at 0-10 and 60-70 cm. The mean Fe/Ca value of parent material was 0.33 with standard deviation 0.12. The models were subsequently used to infer soil age from Fe/Ca values of 388 locations on the floodplain and overbank deposits were delineated based on inferred soil age. In general, deposit age increases with increasing distance from the modern channel. Results support use of this field-based technique to map fluvial terraces at a high resolution.
Titel: |
Using soil geochemistry to map historic and late Holocene floodplains, Four Mile Creek, Ohio
|
---|---|
Autor/in / Beteiligte Person: | O'Connor, Abigale Elizabeth |
Link: | |
Veröffentlichung: | 2023 |
Medientyp: | Hochschulschrift |
Schlagwort: |
|
Sonstiges: |
|