Deglacial ice-marginal glaciolacustrine environments and structural moraine building in Torres del Paine, Chilean southern Patagonia

The late-glacial sedimentologic and geomorphic record of the former Patagonian ice sheet remains mostly unstudied despite the fact that it affords invaluable evidence for glaciologic processes during the last glacial-interglacial transition (i.e., 18-11.5 ka). This information is critical if landfor...

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Autores principales:	García,Juan-Luis, Strelin,Jorge A, Vega,Rodrigo M, Hall,Brenda L, Stern,Charles R
Lenguaje:	English
Publicado:	Servicio Nacional de Geología y Minería (SERNAGEOMIN) 2015
Materias:	Glaciolacustrine sediments Push moraines Late-glacial Torres del Paine National Park Patagonian paleolakes Patagonian Ice Sheet
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-71062015000200003
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spelling	oai:scielo:S0718-710620150002000032015-06-26Deglacial ice-marginal glaciolacustrine environments and structural moraine building in Torres del Paine, Chilean southern PatagoniaGarcía,Juan-LuisStrelin,Jorge AVega,Rodrigo MHall,Brenda LStern,Charles R Glaciolacustrine sediments Push moraines Late-glacial Torres del Paine National Park Patagonian paleolakes Patagonian Ice Sheet The late-glacial sedimentologic and geomorphic record of the former Patagonian ice sheet remains mostly unstudied despite the fact that it affords invaluable evidence for glaciologic processes during the last glacial-interglacial transition (i.e., 18-11.5 ka). This information is critical if landforms (e.g., moraines) and associated sediments are to be used for paleoclimate reconstruction. El Canal stratigraphic section in Torres del Paine, southern Chile (51°S), provides one of the few complete late-glacial morphostratigraphic records preserved on land in Patagonia that has not been reworked by postglacial lake or marine transgressions. Therefore, it provides unique evidence for reconstructing former environments, processes and fluctuations along the ice front at the end of the last glaciation. Here, we present results of a morphostratigraphic study of this site, which was shaped during the late-glacial Torres del Paine-TDP II, III and IV glacier fluctuations. We document the presence of eight sediment lithofacies associations and six stratigraphic sections that expose a complete record of proximal to distal subaqueous processes, which we link to phases of glacier advance (e.g., moraine building) and retreat. During the late-glacial, the Lago del Toro ice lobe pushed and glaciotectonized ice-contact lake sediments several times to shape the TDP moraine ridges fringing present-day lake. The saw-toothed morphology of the ridges confirms the structural origin of these landforms. Based on sediment facies associations, we conclude that local glacial lakes developed along the ice front during deposition of the late-glacial TDP II-IV moraine belts, suggesting that collapse, and associated continental drainage diversion, of major regional-size lakes in Torres del Paine had occurred during this time.info:eu-repo/semantics/openAccessServicio Nacional de Geología y Minería (SERNAGEOMIN)Andean geology v.42 n.2 20152015-05-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-71062015000200003en10.5027/andgeoV42n2-a03
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	Glaciolacustrine sediments Push moraines Late-glacial Torres del Paine National Park Patagonian paleolakes Patagonian Ice Sheet
spellingShingle	Glaciolacustrine sediments Push moraines Late-glacial Torres del Paine National Park Patagonian paleolakes Patagonian Ice Sheet García,Juan-Luis Strelin,Jorge A Vega,Rodrigo M Hall,Brenda L Stern,Charles R Deglacial ice-marginal glaciolacustrine environments and structural moraine building in Torres del Paine, Chilean southern Patagonia
description	The late-glacial sedimentologic and geomorphic record of the former Patagonian ice sheet remains mostly unstudied despite the fact that it affords invaluable evidence for glaciologic processes during the last glacial-interglacial transition (i.e., 18-11.5 ka). This information is critical if landforms (e.g., moraines) and associated sediments are to be used for paleoclimate reconstruction. El Canal stratigraphic section in Torres del Paine, southern Chile (51°S), provides one of the few complete late-glacial morphostratigraphic records preserved on land in Patagonia that has not been reworked by postglacial lake or marine transgressions. Therefore, it provides unique evidence for reconstructing former environments, processes and fluctuations along the ice front at the end of the last glaciation. Here, we present results of a morphostratigraphic study of this site, which was shaped during the late-glacial Torres del Paine-TDP II, III and IV glacier fluctuations. We document the presence of eight sediment lithofacies associations and six stratigraphic sections that expose a complete record of proximal to distal subaqueous processes, which we link to phases of glacier advance (e.g., moraine building) and retreat. During the late-glacial, the Lago del Toro ice lobe pushed and glaciotectonized ice-contact lake sediments several times to shape the TDP moraine ridges fringing present-day lake. The saw-toothed morphology of the ridges confirms the structural origin of these landforms. Based on sediment facies associations, we conclude that local glacial lakes developed along the ice front during deposition of the late-glacial TDP II-IV moraine belts, suggesting that collapse, and associated continental drainage diversion, of major regional-size lakes in Torres del Paine had occurred during this time.
author	García,Juan-Luis Strelin,Jorge A Vega,Rodrigo M Hall,Brenda L Stern,Charles R
author_facet	García,Juan-Luis Strelin,Jorge A Vega,Rodrigo M Hall,Brenda L Stern,Charles R
author_sort	García,Juan-Luis
title	Deglacial ice-marginal glaciolacustrine environments and structural moraine building in Torres del Paine, Chilean southern Patagonia
title_short	Deglacial ice-marginal glaciolacustrine environments and structural moraine building in Torres del Paine, Chilean southern Patagonia
title_full	Deglacial ice-marginal glaciolacustrine environments and structural moraine building in Torres del Paine, Chilean southern Patagonia
title_fullStr	Deglacial ice-marginal glaciolacustrine environments and structural moraine building in Torres del Paine, Chilean southern Patagonia
title_full_unstemmed	Deglacial ice-marginal glaciolacustrine environments and structural moraine building in Torres del Paine, Chilean southern Patagonia
title_sort	deglacial ice-marginal glaciolacustrine environments and structural moraine building in torres del paine, chilean southern patagonia
publisher	Servicio Nacional de Geología y Minería (SERNAGEOMIN)
publishDate	2015
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-71062015000200003
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Deglacial ice-marginal glaciolacustrine environments and structural moraine building in Torres del Paine, Chilean southern Patagonia

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