Journal of Mountain Science

, Volume 14, Issue 2, pp 282–295 | Cite as

Relict glacial landscape in the Sierra Baguales Mountain Range (50°-51° S): evidence of glaciation dynamics and types in the eastern foothills of the southern Patagonian Andes

  • José Miguel Araos
  • Jacobus Philiphus Le Roux
  • Néstor Mauricio Gutierrez
Article
  • 51 Downloads

Abstract

The glacial morphology of southern South American presents invaluable evidence to reconstruct former glacier behaviour and its relation to climate and environmental changes. However, there are still spatial and temporal gaps in the reconstruction of the Holocene Patagonian glacial landscape. Here we present the first geomorphological record for the Sierra Baguales Mountain Range (SBMR), forming the eastern foothills of the Southern Patagonian Andes 200 km from the Pacific coast. This area is topographically isolated from the Southern Patagonian Ice Field (SPIF), and is affected by the Westerly Winds. The study area shows evidence of ice sheet and alpine glaciations related to Andean uplift, which caused a marked climatic contrast between its western and eastern flanks since the Last Glacial Maximum (LGM). The regional rock mass strength and precipitation gradient acted as a controlling factor in the glacial cirque distribution and sizes, as well as in the development of glaciation types. We report new radiocarbon dates associated with warm/dry to cold/wet climatic changes during the middle Holocene, when former small alpine glaciers were located in the uppermost section of the SBMR basins, and eventually converged to form a small ice field or a composite valley glacier at lower elevations. This can be explained by an estimated regional temperature drop of 3.8°C±0.8°C, based on a 585±26 m Equilibrium Line Altitude (ELA) descent, inferred by geomorphological evidence and the Accumulation Area Ratio (AAR), in addition to a free-air adiabatic lapse rate. Subsequently, the glaciers receded due to climatic factors including a rise in temperature, as well as non-climatic factors, mainly the glacier bedrock topography.

Keywords

Glacial morphology Sierra Baguales Ice sheet glaciations Alpine glaciations Middle Holocene 

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Notes

Acknowledgements

We are grateful for grants from the “Becas de Doctorado en Chile” Scholarships Program and “Gastos Operacionales para Proyecto de Tesis Doctoral” of CONICYT. Juan MacLean and his family kindly allowed access to the farms Las Cumbres and Baguales and Juan Pablo Riquez allowed access to the farm Verdadera Argentina. Juan Carlos Aravena and Rodrigo Villa-Martinez of the Universidad de Magallanes, José Luis Oyarzun, and Juan José San Martin provided much-appreciated logistical support. Ricardo Arce, Mauricio Gonzales, Mike Kaplan and Carly Peltier lent invaluable assistance in field activities. Le Roux was supported by Project CONICYT/FONDAP/15090013.

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Copyright information

© Science Press, Institute of Mountain Hazards and Environment, CAS and Springer-Verlag Berlin Heidelberg 2017

Authors and Affiliations

  • José Miguel Araos
    • 1
    • 2
  • Jacobus Philiphus Le Roux
    • 3
  • Néstor Mauricio Gutierrez
    • 1
  1. 1.Department of Geology, FCFMUniversidad de ChileSantiagoChile
  2. 2.Department of Geography, Faculty of Social SciencesUniversidad Alberto HurtadoSantiagoChile
  3. 3.Department of Geology, FCFMUniversidad de Chile, Andean Geothermal Centre of ExcellenceSantiagoChile

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