Quaternary Glaciations in the Andes of North-Central Chile

• Published in: Journal of Glaciology
• Main Authors: Caviedes, Cesar N., Paskoff, Roland
• Format: Article in Journal/Newspaper
• Language: English
• Published: Cambridge University Press (CUP) 1975
• Subjects: Earth-Surface Processes; Austral; Aconcagua; Portillo; Journal of Glaciology
• Online Access: http://dx.doi.org/10.1017/s0022143000013472; https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000013472

The extension of the Quaternary glaciations has been studied in the semi-arid Andes of north-central Chile, where the glacial modelling is striking. In the Elqui valley (lat. 30°S.), two glacial advances were identified reaching down to 3 100 m (Laguna glaciation) and 2500 m (Tapado glaciation). In the Aconcagua valley (lat. 33°S.), moraines from three major glacial advances were found, at 2800 m (Portillo glaciation), 1600 m (Guardia Vieja glaciation) and 1300 m (Salto del Soldado glaciation). The Quaternary glaciations were linked with a decrease of temperature, but more significantly with a marked increase of precipitation probably related to an equatorward shift of 5–6 degrees of the austral polar front. The results obtained in the semi-arid Chilean Andes are correlated with those recently reported from other sectors of the southern Andes.