Multiple landslide clusters record Quaternary climate changes in the northwestern Argentine Andes

The chronology of multiple landslide deposits and related lake sediments in the semi-arid eastern Argentine Cordillera suggests that major mass movements cluster in two time periods during the Quaternary, i.e. between 40 and 25 and after 5 14 C kyr BP. These clusters may correspond to the Minchin (maximum at around 28^27 14 C kyr BP) and Titicaca wet periods (after 3.9 14 C kyr BP). The more humid conditions apparently caused enhanced landsliding in this environment. In contrast, no landslide-related damming and associated lake sediments occurred during the Coipasa (11.5^10 14 C yr BP) and Tauca wet periods (14.5^11 14 C yr BP). The two clusters at 40^25 and after 5 14 C kyr BP may correspond to periods where the El Nin ‹ o^Southern Oscillation (ENSO) and Tropical Atlantic Sea Surface Temperature Variability (TAV) were active. This, however, was not the case during the Coipasa and Tauca wet periods. Lake-balance modelling of a landslide-dammed lake suggests a 10^15% increase in precipitation and a 3^ 4‡C decrease in temperature at V30 14 C kyr BP as compared to the present. In addition, time-series analysis reveals a strong ENSO and TAV during that time. The landslide clusters in northwestern Argentina are therefore best explained by periods of more humid and more variable climates. < 2003 Elsevier Science B.V. All rights reserved.

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