Lanín volcano (39.5°S), Southern Andes: geology and morphostructural evolution

Lanín volcano is a compound stratocone, mainly effusive, made up by four units defined through morphological criteria. The first unit represents an ancient volcano; the youngest three units form the present stratocone built since the Middle-Late Pleistocene. Compositionally, volcanic rocks from Laní...

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Autores principales:	Lara,Luis E., Naranjo,José A., Moreno,Hugo
Lenguaje:	English
Publicado:	Servicio Nacional de Geología y Minería (SERNAGEOMIN) 2004
Materias:	Stratovolcano Geochemistry Morphostructure Bimodal magmatism Southern Andes
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-02082004000200004
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spelling	oai:scielo:S0716-020820040002000042005-03-23Lanín volcano (39.5°S), Southern Andes: geology and morphostructural evolutionLara,Luis E.Naranjo,José A.Moreno,Hugo Stratovolcano Geochemistry Morphostructure Bimodal magmatism Southern Andes Lanín volcano is a compound stratocone, mainly effusive, made up by four units defined through morphological criteria. The first unit represents an ancient volcano; the youngest three units form the present stratocone built since the Middle-Late Pleistocene. Compositionally, volcanic rocks from Lanín Volcano are mainly basalts/basaltic andesites and dacites with scarce intermediate types. Postglacial pyroclastic deposits are also silicic and confirm a sharp bimodality of the magmas. Major oxides and REE patterns suggest a low-pressure magmatic evolution dominated by fractional crystallization of plagioclase and orthopyroxene with extraction of olivine, clinopyroxene and magnetite without complex interactions. The effusive eruptive cycles would be controlled by a short residence in a shallow magma chamber with rapid and coeval evacuation of dacites and basalts. In recent eruptions, viscous magma would have sealed the central conduit inducing the lateral drainage of basalts and, possibly, the partial collapse of the upper part of the cone. Nevertheless, the most active degradational processes are those related to the ice-cover condition of the present stratocone. The singular evolution of Lanín volcano, geochemically and morphologically intermediate between the monogenetic cones and the stratovolcanoes of the Villarrica-Lanín chain, could be related to its distance to the trench which causes low degree of partial melting in the source and the ascent of small batches of magma that would be stored in an ephemeral magma chamberinfo: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=S0716-02082004000200004en10.4067/S0716-02082004000200004
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	Stratovolcano Geochemistry Morphostructure Bimodal magmatism Southern Andes
spellingShingle	Stratovolcano Geochemistry Morphostructure Bimodal magmatism Southern Andes Lara,Luis E. Naranjo,José A. Moreno,Hugo Lanín volcano (39.5°S), Southern Andes: geology and morphostructural evolution
description	Lanín volcano is a compound stratocone, mainly effusive, made up by four units defined through morphological criteria. The first unit represents an ancient volcano; the youngest three units form the present stratocone built since the Middle-Late Pleistocene. Compositionally, volcanic rocks from Lanín Volcano are mainly basalts/basaltic andesites and dacites with scarce intermediate types. Postglacial pyroclastic deposits are also silicic and confirm a sharp bimodality of the magmas. Major oxides and REE patterns suggest a low-pressure magmatic evolution dominated by fractional crystallization of plagioclase and orthopyroxene with extraction of olivine, clinopyroxene and magnetite without complex interactions. The effusive eruptive cycles would be controlled by a short residence in a shallow magma chamber with rapid and coeval evacuation of dacites and basalts. In recent eruptions, viscous magma would have sealed the central conduit inducing the lateral drainage of basalts and, possibly, the partial collapse of the upper part of the cone. Nevertheless, the most active degradational processes are those related to the ice-cover condition of the present stratocone. The singular evolution of Lanín volcano, geochemically and morphologically intermediate between the monogenetic cones and the stratovolcanoes of the Villarrica-Lanín chain, could be related to its distance to the trench which causes low degree of partial melting in the source and the ascent of small batches of magma that would be stored in an ephemeral magma chamber
author	Lara,Luis E. Naranjo,José A. Moreno,Hugo
author_facet	Lara,Luis E. Naranjo,José A. Moreno,Hugo
author_sort	Lara,Luis E.
title	Lanín volcano (39.5°S), Southern Andes: geology and morphostructural evolution
title_short	Lanín volcano (39.5°S), Southern Andes: geology and morphostructural evolution
title_full	Lanín volcano (39.5°S), Southern Andes: geology and morphostructural evolution
title_fullStr	Lanín volcano (39.5°S), Southern Andes: geology and morphostructural evolution
title_full_unstemmed	Lanín volcano (39.5°S), Southern Andes: geology and morphostructural evolution
title_sort	lanín volcano (39.5°s), southern andes: geology and morphostructural evolution
publisher	Servicio Nacional de Geología y Minería (SERNAGEOMIN)
publishDate	2004
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-02082004000200004
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Lanín volcano (39.5°S), Southern Andes: geology and morphostructural evolution

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