Evolution of Parinacota volcano, Central Andes, Northern Chile

Parinacota is an active composite stratovolcano located in the Central Andes of Northern Chile (18°S). During its earlier stage (Parinacota 1 unit, Late Pleistocene, 300-70? ka) rhyolitic to andesitic magmas were erupted, forming a voluminous lava-dome complex with its associated pyroclastic...

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Autores principales:	Clavero R.,Jorge E., Sparks,Stephen J., Polanco,Edmundo, Pringle,Malcolm S.
Lenguaje:	English
Publicado:	Servicio Nacional de Geología y Minería (SERNAGEOMIN) 2004
Materias:	Eruption rate Debris avalanche Holocene Parinacota Chile
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-02082004000200009
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spelling	oai:scielo:S0716-020820040002000092005-03-23Evolution of Parinacota volcano, Central Andes, Northern ChileClavero R.,Jorge E.Sparks,Stephen J.Polanco,EdmundoPringle,Malcolm S. Eruption rate Debris avalanche Holocene Parinacota Chile Parinacota is an active composite stratovolcano located in the Central Andes of Northern Chile (18°S). During its earlier stage (Parinacota 1 unit, Late Pleistocene, 300-70? ka) rhyolitic to andesitic magmas were erupted, forming a voluminous lava-dome complex with its associated pyroclastic fans (mainly block-and-ash flow deposits), essentially deposited towards the Upper Lauca basin (West). It later evolved to a steep-sided composite stratocone (Parinacota 2 unit, Late Pleistocene-Holocene, 70?-8 ka), mainly formed by andesitic lava flows and scoria tephra fallout deposits.Around 8 ka ago the ancestral Parinacota volcano, built during Parinacota 1 and 2, partially collapsed towards the west, in a single and catastrophic event generating the outstanding Parinacota Debris Avalanche deposit.Soon after the collapse a new stratocone started to build with the emission of andesitic lava flows and pyroclastic flows, and their associated fallout deposits (Parinacota 3 unit, Holocene, <8 ka). Some lahars mainly directed towards the south, west and east have also been generated during Parinacota 3. Contemporaneously with the formation of the central cone, a series of flank cones and their associated basaltic andesite to andesitic lava flows were formed (Ajata centres, 6-1.4 ka). These centres erupted through two fractures, NNE and NS oriented, in the south-western flank of the volcano. The new cone (Parinacota 3 unit) has an estimated minimum volume of 18 km³, giving a minimum eruption rate of 2.25 km³ ka-1 for the last 8,000 years, which means that Parinacota volcano must be considered one of the most active volcanoes in the Central Andes of Northern Chile during the Holoceneinfo:eu-repo/semantics/openAccessServicio Nacional de Geología y Minería (SERNAGEOMIN)Revista geológica de Chile v.31 n.2 20042004-12-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-02082004000200009en10.4067/S0716-02082004000200009
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	Eruption rate Debris avalanche Holocene Parinacota Chile
spellingShingle	Eruption rate Debris avalanche Holocene Parinacota Chile Clavero R.,Jorge E. Sparks,Stephen J. Polanco,Edmundo Pringle,Malcolm S. Evolution of Parinacota volcano, Central Andes, Northern Chile
description	Parinacota is an active composite stratovolcano located in the Central Andes of Northern Chile (18°S). During its earlier stage (Parinacota 1 unit, Late Pleistocene, 300-70? ka) rhyolitic to andesitic magmas were erupted, forming a voluminous lava-dome complex with its associated pyroclastic fans (mainly block-and-ash flow deposits), essentially deposited towards the Upper Lauca basin (West). It later evolved to a steep-sided composite stratocone (Parinacota 2 unit, Late Pleistocene-Holocene, 70?-8 ka), mainly formed by andesitic lava flows and scoria tephra fallout deposits.Around 8 ka ago the ancestral Parinacota volcano, built during Parinacota 1 and 2, partially collapsed towards the west, in a single and catastrophic event generating the outstanding Parinacota Debris Avalanche deposit.Soon after the collapse a new stratocone started to build with the emission of andesitic lava flows and pyroclastic flows, and their associated fallout deposits (Parinacota 3 unit, Holocene, <8 ka). Some lahars mainly directed towards the south, west and east have also been generated during Parinacota 3. Contemporaneously with the formation of the central cone, a series of flank cones and their associated basaltic andesite to andesitic lava flows were formed (Ajata centres, 6-1.4 ka). These centres erupted through two fractures, NNE and NS oriented, in the south-western flank of the volcano. The new cone (Parinacota 3 unit) has an estimated minimum volume of 18 km³, giving a minimum eruption rate of 2.25 km³ ka-1 for the last 8,000 years, which means that Parinacota volcano must be considered one of the most active volcanoes in the Central Andes of Northern Chile during the Holocene
author	Clavero R.,Jorge E. Sparks,Stephen J. Polanco,Edmundo Pringle,Malcolm S.
author_facet	Clavero R.,Jorge E. Sparks,Stephen J. Polanco,Edmundo Pringle,Malcolm S.
author_sort	Clavero R.,Jorge E.
title	Evolution of Parinacota volcano, Central Andes, Northern Chile
title_short	Evolution of Parinacota volcano, Central Andes, Northern Chile
title_full	Evolution of Parinacota volcano, Central Andes, Northern Chile
title_fullStr	Evolution of Parinacota volcano, Central Andes, Northern Chile
title_full_unstemmed	Evolution of Parinacota volcano, Central Andes, Northern Chile
title_sort	evolution of parinacota volcano, central andes, northern chile
publisher	Servicio Nacional de Geología y Minería (SERNAGEOMIN)
publishDate	2004
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-02082004000200009
work_keys_str_mv	AT claverorjorgee evolutionofparinacotavolcanocentralandesnorthernchile AT sparksstephenj evolutionofparinacotavolcanocentralandesnorthernchile AT polancoedmundo evolutionofparinacotavolcanocentralandesnorthernchile AT pringlemalcolms evolutionofparinacotavolcanocentralandesnorthernchile
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Evolution of Parinacota volcano, Central Andes, Northern Chile

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