Factors controlling alpine glaciations in the Sierra Baguales Mountain Range of southern Patagonia (50° S), inferred from the morphometric analysis of glacial cirques

ABSTRACT The Sierra Baguales Mountain Range, forming the eastern foothills of the Southern Patagonian Andes, has well-developed alpine-glaciated landforms which present an ideal opportunity to study climatic and non-climatic factors that control cirque development and morphology. One hundred and for...

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Autores principales:	Araos,José M., Le Roux,Jacobus P., Kaplan,Michael R., Spagnolo,Matteo
Lenguaje:	English
Publicado:	Servicio Nacional de Geología y Minería (SERNAGEOMIN) 2018
Materias:	Cirque Sierra Baguales Mountain Range Glacial geomorphology Alpine glaciation Southern Patagonia
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-71062018000300357
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spelling	oai:scielo:S0718-710620180003003572018-11-05Factors controlling alpine glaciations in the Sierra Baguales Mountain Range of southern Patagonia (50° S), inferred from the morphometric analysis of glacial cirquesAraos,José M.Le Roux,Jacobus P.Kaplan,Michael R.Spagnolo,Matteo Cirque Sierra Baguales Mountain Range Glacial geomorphology Alpine glaciation Southern Patagonia ABSTRACT The Sierra Baguales Mountain Range, forming the eastern foothills of the Southern Patagonian Andes, has well-developed alpine-glaciated landforms which present an ideal opportunity to study climatic and non-climatic factors that control cirque development and morphology. One hundred and forty-three glacial cirques were studied with reference to 14 morphometric attributes which were analyzed using statistical analysis and GIS methodologies. The cirques were classified into two types using cluster analysis complimented with a composite map based on the attributes, the latter technique that is applied to glacial cirque analysis for the first time. Type 1 cirques are associated with glacial processes isolated from the Southern Patagonian Ice Field (SPIF), developed under locally cold and dry climatic conditions. Type 2 glacial cirques are associated with older, more extensive glacial processes controlled by regional-scale climate variables and the presence of the Pleistocene Ice Sheet. The results show that the development of most of the glacial cirques has been controlled mainly by their aspect, exposure to solar radiation, Southern Hemisphere Westerly winds, and cirque floor slope. Finally, we concluded that our analyses show the evolution of cirques in the Sierra Baguales Mountain Range was not uniform. Cirque glaciers that developed to the west, close to the Southern Patagonian Ice field, have been more dynamic, and therefore their cirques experienced more erosion than those located to the east.info:eu-repo/semantics/openAccessServicio Nacional de Geología y Minería (SERNAGEOMIN)Andean geology v.45 n.3 20182018-01-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-71062018000300357en10.5027/andgeov45n3-2974
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	Cirque Sierra Baguales Mountain Range Glacial geomorphology Alpine glaciation Southern Patagonia
spellingShingle	Cirque Sierra Baguales Mountain Range Glacial geomorphology Alpine glaciation Southern Patagonia Araos,José M. Le Roux,Jacobus P. Kaplan,Michael R. Spagnolo,Matteo Factors controlling alpine glaciations in the Sierra Baguales Mountain Range of southern Patagonia (50° S), inferred from the morphometric analysis of glacial cirques
description	ABSTRACT The Sierra Baguales Mountain Range, forming the eastern foothills of the Southern Patagonian Andes, has well-developed alpine-glaciated landforms which present an ideal opportunity to study climatic and non-climatic factors that control cirque development and morphology. One hundred and forty-three glacial cirques were studied with reference to 14 morphometric attributes which were analyzed using statistical analysis and GIS methodologies. The cirques were classified into two types using cluster analysis complimented with a composite map based on the attributes, the latter technique that is applied to glacial cirque analysis for the first time. Type 1 cirques are associated with glacial processes isolated from the Southern Patagonian Ice Field (SPIF), developed under locally cold and dry climatic conditions. Type 2 glacial cirques are associated with older, more extensive glacial processes controlled by regional-scale climate variables and the presence of the Pleistocene Ice Sheet. The results show that the development of most of the glacial cirques has been controlled mainly by their aspect, exposure to solar radiation, Southern Hemisphere Westerly winds, and cirque floor slope. Finally, we concluded that our analyses show the evolution of cirques in the Sierra Baguales Mountain Range was not uniform. Cirque glaciers that developed to the west, close to the Southern Patagonian Ice field, have been more dynamic, and therefore their cirques experienced more erosion than those located to the east.
author	Araos,José M. Le Roux,Jacobus P. Kaplan,Michael R. Spagnolo,Matteo
author_facet	Araos,José M. Le Roux,Jacobus P. Kaplan,Michael R. Spagnolo,Matteo
author_sort	Araos,José M.
title	Factors controlling alpine glaciations in the Sierra Baguales Mountain Range of southern Patagonia (50° S), inferred from the morphometric analysis of glacial cirques
title_short	Factors controlling alpine glaciations in the Sierra Baguales Mountain Range of southern Patagonia (50° S), inferred from the morphometric analysis of glacial cirques
title_full	Factors controlling alpine glaciations in the Sierra Baguales Mountain Range of southern Patagonia (50° S), inferred from the morphometric analysis of glacial cirques
title_fullStr	Factors controlling alpine glaciations in the Sierra Baguales Mountain Range of southern Patagonia (50° S), inferred from the morphometric analysis of glacial cirques
title_full_unstemmed	Factors controlling alpine glaciations in the Sierra Baguales Mountain Range of southern Patagonia (50° S), inferred from the morphometric analysis of glacial cirques
title_sort	factors controlling alpine glaciations in the sierra baguales mountain range of southern patagonia (50° s), inferred from the morphometric analysis of glacial cirques
publisher	Servicio Nacional de Geología y Minería (SERNAGEOMIN)
publishDate	2018
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-71062018000300357
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_version_	1714205859091841024

Factors controlling alpine glaciations in the Sierra Baguales Mountain Range of southern Patagonia (50° S), inferred from the morphometric analysis of glacial cirques

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