The origin and emplacement of Domo Tinto, Guallatiri volcano, Northern Chile

Guallatiri Volcano (18°25'S, 69°05'W) is a large edifice located on the Chilean Altiplano near the Bolivia/Chile border. This Pleistocene-Holocene construct, situated at the southern end of the Nevados de Quimsachata chain, is an andesitic/dacitic complex formed of early stage lava flows a...

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Autores principales:	Watts,Robert B, Clavero Ribes,Jorge, J. Sparks,R. Stephen
Lenguaje:	English
Publicado:	Servicio Nacional de Geología y Minería (SERNAGEOMIN) 2014
Materias:	Guallatiri Geology Low-dome Hummock Extrusion
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-71062014000300004
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spelling	oai:scielo:S0718-710620140003000042014-11-10The origin and emplacement of Domo Tinto, Guallatiri volcano, Northern ChileWatts,Robert BClavero Ribes,JorgeJ. Sparks,R. Stephen Guallatiri Geology Low-dome Hummock Extrusion Guallatiri Volcano (18°25'S, 69°05'W) is a large edifice located on the Chilean Altiplano near the Bolivia/Chile border. This Pleistocene-Holocene construct, situated at the southern end of the Nevados de Quimsachata chain, is an andesitic/dacitic complex formed of early stage lava flows and later stage coulées and lava domes. Domo Tinto (5±3 ka, recent 40Ar/39Ar date) is a small dome located on the southern flanks of Guallatiri Volcano. It is composed of monotonous, crystal-rich andesite (~62% SiO2) with predominant plagioclase, amphibole, biotite and rare clinopyroxene within a glassy groundmass containing plagioclase and subordinate amphibole microlites. Geochemical data indicate the Tinto lava is compositionally homogeneous. The occurrence of ovoid magmatic inclusions of basaltic andesite (<0.5% volume) and ubiquitous disequilibrium features in the mineral assemblage indicate that the magma chamber was perturbed by repeated intrusions of mafic magma. These events promoted magma-mingling, inclusion disaggregation and convective self-mixing before a critical recharge event triggered eruption and formation of the dome. Glacially eroded sections through Domo Tinto indicate that it was formed by the sequential extrusion of several hummocky lobes with a sub-horizontal base and a convex-upward upper surface. Each lobe exhibits a thin, basal zone of foliated lava and a thick interior of massive lava (up to ~20 m thick) and these lobes have piled atop each other to form an overall pancake morphology. The lack of any associated explosive material and collapse-scar features indicate the formation of Domo Tinto was relatively benign.info:eu-repo/semantics/openAccessServicio Nacional de Geología y Minería (SERNAGEOMIN)Andean geology v.41 n.3 20142014-09-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-71062014000300004en10.5027/andgeoV41n3-a04
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	Guallatiri Geology Low-dome Hummock Extrusion
spellingShingle	Guallatiri Geology Low-dome Hummock Extrusion Watts,Robert B Clavero Ribes,Jorge J. Sparks,R. Stephen The origin and emplacement of Domo Tinto, Guallatiri volcano, Northern Chile
description	Guallatiri Volcano (18°25'S, 69°05'W) is a large edifice located on the Chilean Altiplano near the Bolivia/Chile border. This Pleistocene-Holocene construct, situated at the southern end of the Nevados de Quimsachata chain, is an andesitic/dacitic complex formed of early stage lava flows and later stage coulées and lava domes. Domo Tinto (5±3 ka, recent 40Ar/39Ar date) is a small dome located on the southern flanks of Guallatiri Volcano. It is composed of monotonous, crystal-rich andesite (~62% SiO2) with predominant plagioclase, amphibole, biotite and rare clinopyroxene within a glassy groundmass containing plagioclase and subordinate amphibole microlites. Geochemical data indicate the Tinto lava is compositionally homogeneous. The occurrence of ovoid magmatic inclusions of basaltic andesite (<0.5% volume) and ubiquitous disequilibrium features in the mineral assemblage indicate that the magma chamber was perturbed by repeated intrusions of mafic magma. These events promoted magma-mingling, inclusion disaggregation and convective self-mixing before a critical recharge event triggered eruption and formation of the dome. Glacially eroded sections through Domo Tinto indicate that it was formed by the sequential extrusion of several hummocky lobes with a sub-horizontal base and a convex-upward upper surface. Each lobe exhibits a thin, basal zone of foliated lava and a thick interior of massive lava (up to ~20 m thick) and these lobes have piled atop each other to form an overall pancake morphology. The lack of any associated explosive material and collapse-scar features indicate the formation of Domo Tinto was relatively benign.
author	Watts,Robert B Clavero Ribes,Jorge J. Sparks,R. Stephen
author_facet	Watts,Robert B Clavero Ribes,Jorge J. Sparks,R. Stephen
author_sort	Watts,Robert B
title	The origin and emplacement of Domo Tinto, Guallatiri volcano, Northern Chile
title_short	The origin and emplacement of Domo Tinto, Guallatiri volcano, Northern Chile
title_full	The origin and emplacement of Domo Tinto, Guallatiri volcano, Northern Chile
title_fullStr	The origin and emplacement of Domo Tinto, Guallatiri volcano, Northern Chile
title_full_unstemmed	The origin and emplacement of Domo Tinto, Guallatiri volcano, Northern Chile
title_sort	origin and emplacement of domo tinto, guallatiri volcano, northern chile
publisher	Servicio Nacional de Geología y Minería (SERNAGEOMIN)
publishDate	2014
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-71062014000300004
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The origin and emplacement of Domo Tinto, Guallatiri volcano, Northern Chile

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