Mio-Pliocene glaciations of Central Patagonia: New evidence and tectonic implications

Patagonia is well known for spectacular oceurrences of a variety of glacial-derived landforms and deposits and for a long history of ancient glaciations. In this paper, we first review the diverse evidence that demonstrates the development of glacial-related sedimentary units within the Central Pata...

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Autores principales:	Lagabrielle,Yves, Scalabrino,Bruno, Suárez,Manuel, Ritz,Jean-Francois
Lenguaje:	English
Publicado:	Servicio Nacional de Geología y Minería (SERNAGEOMIN) 2010
Materias:	Mio-Pliocene glaciations Tectonism Patagonia
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-71062010000200002
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spelling	oai:scielo:S0718-710620100002000022010-10-06Mio-Pliocene glaciations of Central Patagonia: New evidence and tectonic implicationsLagabrielle,YvesScalabrino,BrunoSuárez,ManuelRitz,Jean-Francois Mio-Pliocene glaciations Tectonism Patagonia Patagonia is well known for spectacular oceurrences of a variety of glacial-derived landforms and deposits and for a long history of ancient glaciations. In this paper, we first review the diverse evidence that demonstrates the development of glacial-related sedimentary units within the Central Patagonian Cordillera since 7 Ma. Well preserved glacial landforms at the top surface of mesetas on both sides of the Lago General Carrera-Buenos Aires are described: the Meseta Guenguel to the north, and the volcanic Meseta del Lago Buenos Aires to the south. The latter meseta corresponds to a 3 Ma old, morphologically inverted paleo-piedmont, based on Ar/Ar dates of the uppermost lava flows. It shows evidence of glacier advances to the NE direction. Over a distance of 20 km, glacial landforms observed by remote sensing data and digital elevation model define glacial tongues that were fed by the Cordillera reliefs to the west. These lobes are now beheaded from their westward sources along a morpho-structural corridor that bounds the Meseta del Lago Buenos Aires to the west. These remnants can be correlated with the oldest glacial landforms recognized north of Lago General Carrera-Buenos Aires, on the Meseta Guenguel that form the Chipanque moraine system. From these features it is concluded that the glacial drainage network of Central Patagonia has been strongly modified following relief inversion in response to erosion processes and to tectonic causes. Changes occurred after 3 Ma, from a smooth piedmont surface covered by an extensive ice mantle ending with ampie glacial lobes, to the current series of deeply incised glacial valleys such as the Lago General Carrera-Buenos Aires depression. These new data bear important con-straints on the history and development of the first glaciations in southern South America.info:eu-repo/semantics/openAccessServicio Nacional de Geología y Minería (SERNAGEOMIN)Andean geology v.37 n.2 20102010-07-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-71062010000200002en
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	Mio-Pliocene glaciations Tectonism Patagonia
spellingShingle	Mio-Pliocene glaciations Tectonism Patagonia Lagabrielle,Yves Scalabrino,Bruno Suárez,Manuel Ritz,Jean-Francois Mio-Pliocene glaciations of Central Patagonia: New evidence and tectonic implications
description	Patagonia is well known for spectacular oceurrences of a variety of glacial-derived landforms and deposits and for a long history of ancient glaciations. In this paper, we first review the diverse evidence that demonstrates the development of glacial-related sedimentary units within the Central Patagonian Cordillera since 7 Ma. Well preserved glacial landforms at the top surface of mesetas on both sides of the Lago General Carrera-Buenos Aires are described: the Meseta Guenguel to the north, and the volcanic Meseta del Lago Buenos Aires to the south. The latter meseta corresponds to a 3 Ma old, morphologically inverted paleo-piedmont, based on Ar/Ar dates of the uppermost lava flows. It shows evidence of glacier advances to the NE direction. Over a distance of 20 km, glacial landforms observed by remote sensing data and digital elevation model define glacial tongues that were fed by the Cordillera reliefs to the west. These lobes are now beheaded from their westward sources along a morpho-structural corridor that bounds the Meseta del Lago Buenos Aires to the west. These remnants can be correlated with the oldest glacial landforms recognized north of Lago General Carrera-Buenos Aires, on the Meseta Guenguel that form the Chipanque moraine system. From these features it is concluded that the glacial drainage network of Central Patagonia has been strongly modified following relief inversion in response to erosion processes and to tectonic causes. Changes occurred after 3 Ma, from a smooth piedmont surface covered by an extensive ice mantle ending with ampie glacial lobes, to the current series of deeply incised glacial valleys such as the Lago General Carrera-Buenos Aires depression. These new data bear important con-straints on the history and development of the first glaciations in southern South America.
author	Lagabrielle,Yves Scalabrino,Bruno Suárez,Manuel Ritz,Jean-Francois
author_facet	Lagabrielle,Yves Scalabrino,Bruno Suárez,Manuel Ritz,Jean-Francois
author_sort	Lagabrielle,Yves
title	Mio-Pliocene glaciations of Central Patagonia: New evidence and tectonic implications
title_short	Mio-Pliocene glaciations of Central Patagonia: New evidence and tectonic implications
title_full	Mio-Pliocene glaciations of Central Patagonia: New evidence and tectonic implications
title_fullStr	Mio-Pliocene glaciations of Central Patagonia: New evidence and tectonic implications
title_full_unstemmed	Mio-Pliocene glaciations of Central Patagonia: New evidence and tectonic implications
title_sort	mio-pliocene glaciations of central patagonia: new evidence and tectonic implications
publisher	Servicio Nacional de Geología y Minería (SERNAGEOMIN)
publishDate	2010
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-71062010000200002
work_keys_str_mv	AT lagabrielleyves mioplioceneglaciationsofcentralpatagonianewevidenceandtectonicimplications AT scalabrinobruno mioplioceneglaciationsofcentralpatagonianewevidenceandtectonicimplications AT suarezmanuel mioplioceneglaciationsofcentralpatagonianewevidenceandtectonicimplications AT ritzjeanfrancois mioplioceneglaciationsofcentralpatagonianewevidenceandtectonicimplications
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Mio-Pliocene glaciations of Central Patagonia: New evidence and tectonic implications

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