Subvolcanic contact metasomatism at El Laco Volcanic Complex, Central Andes

Studies of drill cores from the Pasos Blancos area at El Laco in the central Andes, northern Chile, give evidence of an intense and extensive subvolcanic contact-metasomatic process. This process resulted from shallow-level emplacement of very volatile-rich iron-oxide magma, with discharge of volati...

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Autores principales:	Naranjo,José A, Henríquez,Fernando, Nyström,Jan O
Lenguaje:	English
Publicado:	Servicio Nacional de Geología y Minería (SERNAGEOMIN) 2010
Materias:	Contact metasomatism Iron oxide magmas El Laco Northern Chile Andes
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-71062010000100005
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spelling	oai:scielo:S0718-710620100001000052010-04-14Subvolcanic contact metasomatism at El Laco Volcanic Complex, Central AndesNaranjo,José AHenríquez,FernandoNyström,Jan O Contact metasomatism Iron oxide magmas El Laco Northern Chile Andes Studies of drill cores from the Pasos Blancos area at El Laco in the central Andes, northern Chile, give evidence of an intense and extensive subvolcanic contact-metasomatic process. This process resulted from shallow-level emplacement of very volatile-rich iron-oxide magma, with discharge of volatiles that resulted in extensive fracturing of overlying volcanic rocks. The brecciated rocks were altered (mainly extensive scapolitization and formation of pyroxene) by hot magmatic fluids emitted from the cooling intrusion , and accompanied by magnetite deposition. With time and decreasing temperature, the metasomatic fluids evolved to fluids of hydrothermal character, and a final recent geothermal event took place that deposited superficial gypsum over a large part of the El Laco Volcanic Complex.info:eu-repo/semantics/openAccessServicio Nacional de Geología y Minería (SERNAGEOMIN)Andean geology v.37 n.1 20102010-01-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-71062010000100005en10.4067/S0718-71062010000100005
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	Contact metasomatism Iron oxide magmas El Laco Northern Chile Andes
spellingShingle	Contact metasomatism Iron oxide magmas El Laco Northern Chile Andes Naranjo,José A Henríquez,Fernando Nyström,Jan O Subvolcanic contact metasomatism at El Laco Volcanic Complex, Central Andes
description	Studies of drill cores from the Pasos Blancos area at El Laco in the central Andes, northern Chile, give evidence of an intense and extensive subvolcanic contact-metasomatic process. This process resulted from shallow-level emplacement of very volatile-rich iron-oxide magma, with discharge of volatiles that resulted in extensive fracturing of overlying volcanic rocks. The brecciated rocks were altered (mainly extensive scapolitization and formation of pyroxene) by hot magmatic fluids emitted from the cooling intrusion , and accompanied by magnetite deposition. With time and decreasing temperature, the metasomatic fluids evolved to fluids of hydrothermal character, and a final recent geothermal event took place that deposited superficial gypsum over a large part of the El Laco Volcanic Complex.
author	Naranjo,José A Henríquez,Fernando Nyström,Jan O
author_facet	Naranjo,José A Henríquez,Fernando Nyström,Jan O
author_sort	Naranjo,José A
title	Subvolcanic contact metasomatism at El Laco Volcanic Complex, Central Andes
title_short	Subvolcanic contact metasomatism at El Laco Volcanic Complex, Central Andes
title_full	Subvolcanic contact metasomatism at El Laco Volcanic Complex, Central Andes
title_fullStr	Subvolcanic contact metasomatism at El Laco Volcanic Complex, Central Andes
title_full_unstemmed	Subvolcanic contact metasomatism at El Laco Volcanic Complex, Central Andes
title_sort	subvolcanic contact metasomatism at el laco volcanic complex, central andes
publisher	Servicio Nacional de Geología y Minería (SERNAGEOMIN)
publishDate	2010
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-71062010000100005
work_keys_str_mv	AT naranjojosea subvolcaniccontactmetasomatismatellacovolcaniccomplexcentralandes AT henriquezfernando subvolcaniccontactmetasomatismatellacovolcaniccomplexcentralandes AT nystromjano subvolcaniccontactmetasomatismatellacovolcaniccomplexcentralandes
_version_	1714205827142778880

Subvolcanic contact metasomatism at El Laco Volcanic Complex, Central Andes

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