Paleolimnology and Environmental Change in South America

Paleolimnology in South America has emerged as a critical field for reconstructing past climates, ecological dynamics and human impacts across diverse aquatic systems from the Andes to the Pampas. By analysing sediment cores from lakes and adjacent basins, researchers have traced hydrological fluctuations, temperature shifts and nutrient cycles over time scales ranging from centuries to millions of years. Key proxy indicators include biological remains such as diatoms, cladocerans and ostracods, geochemical markers like stable isotopes and elemental concentrations, and physical sediment properties characterised by particle size and mineralogy. These records capture the influence of regional drivers such as the South American summer monsoon, El Niño–Southern Oscillation variability and Andean orogeny, as well as teleconnections with global climate events like the Little Ice Age and Pleistocene glacial cycles. Interdisciplinary approaches integrate luminescence dating, detrital zircon geochronology and multiproxy analyses to resolve chronological frameworks and source sediments. Findings have illuminated the timing of aeolian dust deposition, millennial‐scale moisture changes in high‐altitude basins and anthropogenic alterations associated with pre‐Columbian and modern land‐use practices. The resulting insights not only deepen our understanding of continental palaeoenvironmental history but also inform projections of future water resource resilience and ecosystem conservation under ongoing climate change.

Research from Nature Portfolio

Recent studies have elucidated the long‐term development of wind‐blown sediment systems that indirectly influence lake sedimentation patterns across southern South America. One investigation into the late Miocene to Holocene aeolian records of the Pampas demonstrates that fluvial transport has sustained a persistent loess province since the late Miocene, coincident with global cooling events. This work emphasises the coupling between terrestrial dust sources and broader climate forcing mechanisms. Another study focused on the Tafí del Valle depression in the eastern Andes employed large‐n detrital zircon U–Pb geochronology to pinpoint the southern Puna Plateau as the primary source of upper Pleistocene loess deposits. Mapping of wind‐erosion features confirmed a dominant westerly‐northwesterly circulation during peak dust accumulation phases, offering crucial context for understanding the delivery of terrigenous material to Andean lakes and floodplains.

Paleolimnology and Environmental Change in South America publication trend

The graph below shows the total number of articles in paleolimnology and environmental change in south america across all publications each year (not limited to Nature Index journals).

Technical terms

Paleolimnology: The study of lake sediments to reconstruct past environmental and climatic conditions.

Loess: Wind-blown silt deposits that accumulate over time to form widespread terrestrial layers.

Detrital zircon geochronology: Age determination of sedimentary particles using uranium–lead dating of zircon grains to infer sediment sources and transport pathways.

Multiproxy reconstruction: The integration of multiple biological, chemical and physical indicators to achieve a comprehensive palaeoenvironmental record.

Diatom assemblage: The community composition of siliceous algae preserved in sediments, used to infer water chemistry and climatic conditions.

Cladoceran: A group of freshwater crustaceans whose resting eggs in sediments serve as indicators of past trophic and hydrological changes.

Ostracod: Small bivalved crustaceans whose calcareous shells in sediments provide information on salinity, temperature and water depth variations.

Paleosol: A buried soil horizon preserved within a sedimentary sequence, reflecting past surface stability and climatic regimes.

References

1. Global climate forcing on late Miocene establishment of the Pampean aeolian system in South America. Nature Communications (2023).
2. A westerly wind dominated Puna Plateau during deposition of upper Pleistocene loessic sediments in the subtropical Andes, South America. Nature Communications (2022).
3. A 700-year multiproxy reconstruction on the Argentinian Pampas inferred from the sediments of Laguna Blanca Grande. Journal of South American Earth Sciences (2021).
4. Late Pleistocene-Holocene History of Chaco-Pampa Sediments in Argentina and Paraguay. E&G Quaternary Science Journal (2011).