Earth and Planetary Sciences
3 years ago

Ancient beach ridges reveal climate secrets of Argentina's Inner Río de la Plata Estuary.

Journal of Iberian Geology
Chronology of recent sedimentary infill of the Inner Río de la Plata Estuary, Argentina
Ferrán Colombo Piñol, Jordi Serra, Patrícia Cabello, Jose Manuel Bedmar, Federico Ignacio Isla

Paper Summary

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The Inner Río de la Plata Estuary in Argentina has been filling up with sediment over time. The sediment comes from rivers and creeks, and the area has been shaped by changes in sea level and climate patterns like ENSO. The researchers found that beach ridges formed every 13-14 years after a period of high flooding, and the estuary has been filling in with sediment for thousands of years. The current delta in the estuary is still growing at a rate of about 56-64 meters per year.