New insights on the origin of the Mesón Alto deposit, Yeso Valley, central Chile: A composite deposit of glacial and landslide processes?

The Mesón Alto chaotic deposit, located in the Main Cordillera at about 33°40'S, is an important landform with a volume of ca. 4.5 km³ unconsolidated material deposited downstream of the Yeso Dam in the Yeso Valley, Río Maipo drainage basin. Historical work related this large deposit to a glaci...

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Autores principales:	Deckart,Katja, Pinochet,Katherine, Sepúlveda,Sergio A, Pinto,Luisa, Moreiras,Stella M
Lenguaje:	English
Publicado:	Servicio Nacional de Geología y Minería (SERNAGEOMIN) 2014
Materias:	Mesón Alto deposit Landslide Glacial material Granitoids Yeso Valley Geological hazard
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-71062014000100010
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spelling	oai:scielo:S0718-710620140001000102014-03-24New insights on the origin of the Mesón Alto deposit, Yeso Valley, central Chile: A composite deposit of glacial and landslide processes?Deckart,KatjaPinochet,KatherineSepúlveda,Sergio APinto,LuisaMoreiras,Stella M Mesón Alto deposit Landslide Glacial material Granitoids Yeso Valley Geological hazard The Mesón Alto chaotic deposit, located in the Main Cordillera at about 33°40'S, is an important landform with a volume of ca. 4.5 km³ unconsolidated material deposited downstream of the Yeso Dam in the Yeso Valley, Río Maipo drainage basin. Historical work related this large deposit to a glacial origin whereas later on, it was assigned to a megalandslide that originated in the Cerro Mesón Alto Massif. First results of integrated fieldwork along with petrographic and geochemical laboratory work on granitoid blocks from five different portions of the deposit, compared with the major outcropping intrusive units in the neighbourhood (La Gloria Pluton, Cerro Mesón Alto Massif and Cerro Aparejo Intrusion) point to a landslide origin of the surface blocks. The results suggest that granitoid fragments of the deposit most likely belong to the Cerro Mesón Alto Massif, the proposed source of the rock avalanche. However, morphometric parameters and field observations support the idea of a rock avalanche deposited on top of glacial material. Therefore, the Mesón Alto deposit should be assigned to a composite origin. Confirmation of a post-glacial, large volume rock avalanche in a strategic area for existent infrastructure for Santiago water supply and ongoing energy projects is fundamental for a correct hazard and risk assessment of the region.info:eu-repo/semantics/openAccessServicio Nacional de Geología y Minería (SERNAGEOMIN)Andean geology v.41 n.1 20142014-01-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-71062014000100010en10.5027/andgeoV41n1-a10
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	Mesón Alto deposit Landslide Glacial material Granitoids Yeso Valley Geological hazard
spellingShingle	Mesón Alto deposit Landslide Glacial material Granitoids Yeso Valley Geological hazard Deckart,Katja Pinochet,Katherine Sepúlveda,Sergio A Pinto,Luisa Moreiras,Stella M New insights on the origin of the Mesón Alto deposit, Yeso Valley, central Chile: A composite deposit of glacial and landslide processes?
description	The Mesón Alto chaotic deposit, located in the Main Cordillera at about 33°40'S, is an important landform with a volume of ca. 4.5 km³ unconsolidated material deposited downstream of the Yeso Dam in the Yeso Valley, Río Maipo drainage basin. Historical work related this large deposit to a glacial origin whereas later on, it was assigned to a megalandslide that originated in the Cerro Mesón Alto Massif. First results of integrated fieldwork along with petrographic and geochemical laboratory work on granitoid blocks from five different portions of the deposit, compared with the major outcropping intrusive units in the neighbourhood (La Gloria Pluton, Cerro Mesón Alto Massif and Cerro Aparejo Intrusion) point to a landslide origin of the surface blocks. The results suggest that granitoid fragments of the deposit most likely belong to the Cerro Mesón Alto Massif, the proposed source of the rock avalanche. However, morphometric parameters and field observations support the idea of a rock avalanche deposited on top of glacial material. Therefore, the Mesón Alto deposit should be assigned to a composite origin. Confirmation of a post-glacial, large volume rock avalanche in a strategic area for existent infrastructure for Santiago water supply and ongoing energy projects is fundamental for a correct hazard and risk assessment of the region.
author	Deckart,Katja Pinochet,Katherine Sepúlveda,Sergio A Pinto,Luisa Moreiras,Stella M
author_facet	Deckart,Katja Pinochet,Katherine Sepúlveda,Sergio A Pinto,Luisa Moreiras,Stella M
author_sort	Deckart,Katja
title	New insights on the origin of the Mesón Alto deposit, Yeso Valley, central Chile: A composite deposit of glacial and landslide processes?
title_short	New insights on the origin of the Mesón Alto deposit, Yeso Valley, central Chile: A composite deposit of glacial and landslide processes?
title_full	New insights on the origin of the Mesón Alto deposit, Yeso Valley, central Chile: A composite deposit of glacial and landslide processes?
title_fullStr	New insights on the origin of the Mesón Alto deposit, Yeso Valley, central Chile: A composite deposit of glacial and landslide processes?
title_full_unstemmed	New insights on the origin of the Mesón Alto deposit, Yeso Valley, central Chile: A composite deposit of glacial and landslide processes?
title_sort	new insights on the origin of the mesón alto deposit, yeso valley, central chile: a composite deposit of glacial and landslide processes?
publisher	Servicio Nacional de Geología y Minería (SERNAGEOMIN)
publishDate	2014
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-71062014000100010
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New insights on the origin of the Mesón Alto deposit, Yeso Valley, central Chile: A composite deposit of glacial and landslide processes?

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