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Chronology, stratigraphy and hydrological modelling of extensive wetlands and paleolakes in the hyperarid core of the Atacama Desert during the late quaternary
- Source :
- Quaternary Science Reviews. 197:224-245
- Publication Year :
- 2018
- Publisher :
- Elsevier BV, 2018.
-
Abstract
- The halite-encrusted salt pans (salars) present at low elevations in the hyperarid core of the Atacama Desert in northern Chile are unique features of one of the driest and possibly oldest deserts on Earth. Here we show that these landscapes were shallow freshwater lakes and wetlands during the last glacial period and formed periodically between ∼46.9 ka and 7.7 ka. The moisture appears to have been sourced from increased Andean runoff and most of our chronologies for these deposits were coeval with the Central Andean Pluvial Event (17.5–14.2 ka and 13.8–9.7 ka), but we also find evidence for older as well as slightly younger wet phases. These environments supported a diverse hygrophytic-halophytic vegetation, as well as an array of diatoms and gastropods. Using a regional hydrological model, we estimate that recharge rates from 1.5 to 4 times present were required to activate and maintain these wetlands in the past. Activation in the late Pleistocene was part of a regional enhancement of water resources, extending from the Andes, downstream and through riparian corridors, to the lowest and most arid portions of the desert itself. This fundamentally unique environment was encountered by the earliest human explorers in the region, and most likely facilitated migration and encampments on a landscape that at present lacks macroscopic life on its surface.
- Subjects :
- Salt pan
010506 paleontology
Archeology
Global and Planetary Change
geography
geography.geographical_feature_category
Pleistocene
Geology
Wetland
010502 geochemistry & geophysics
01 natural sciences
Arid
Pluvial
Glacial period
Physical geography
Quaternary
Ecology, Evolution, Behavior and Systematics
0105 earth and related environmental sciences
Riparian zone
Subjects
Details
- ISSN :
- 02773791
- Volume :
- 197
- Database :
- OpenAIRE
- Journal :
- Quaternary Science Reviews
- Accession number :
- edsair.doi...........06fb6d06d363d71399903697829f08d1