Distribución y caracterización de la geomorfología glaciar en la Cordillera Oriental de Argentina
“Distribution and characterization of glacial geomorphology in the Cordillera Oriental, Argentina”. The Cordillera Oriental of Argentina (COA) is a north-south trend moun- tain range which extends from 22 º to 26.3 º SL in Northwestern Argentina. An orographic effect on the precipitations creates a sharp contrast between the wetter eastern side and the drier western side. Many glaciers occupied the highest parts of the COA during the Late Pleistocene. In this work we survey the distribution of the glacial geomorphology, characterize the main geomorphic features, and discuss about its paleoclimatic implications. Also, we choose two representative sectors to show the main characteristics of the glacial geomor- phology of the COA. The main glacial landforms correspond to cirques, valleys, arêtes and moraines. The characteristics and distributions of these landforms suggest that they were formed by typical wet-based valley glaciers which maximum length was less than 10 km. The moraines are located above ~3500 m a.s.l. and show an east-west asymmetry, where they are best developed and reach lower altitudes in the eastern slope than in the western slope. This difference is attributed to the greater amount of precipitation on the eastern slope which indicates that the pattern of rainfall during the glaciations was similar to the present. The characteristics of the marginal moraines suggest a decoupling between the glacial and glaci- fluvial transport systems, which is associated with high rates of sediment supply to the gla- ciers and arid to semi-arid climate.
| Main Authors: | , , |
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| Format: | Digital revista |
| Language: | spa |
| Published: |
Fundación Miguel Lillo
2015
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| Online Access: | http://www.lillo.org.ar/journals/index.php/acta-geologica-lilloana/article/view/135 |
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