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dc.contributor.author
Gioncada, Anna
dc.contributor.author
Orlandi, Paolo
dc.contributor.author
Vezzoli, Luigina
dc.contributor.author
Omarini, Ricardo Hector
dc.contributor.author
Mazzuoli, Roberto
dc.contributor.author
Lopez Azarevich, Vanina
dc.contributor.author
Sureda, Ricardo Jose
dc.contributor.author
Azarevich, Miguel Basilio
dc.contributor.author
Acocella, Valerio
dc.contributor.author
Ruch, Joel
dc.date.available
2017-12-21T18:20:50Z
dc.date.issued
2013-10
dc.identifier.citation
Ruch, Joel; Acocella, Valerio; Azarevich, Miguel Basilio; Sureda, Ricardo Jose; Lopez Azarevich, Vanina; Mazzuoli, Roberto; et al.; Topaz magmatic crystallization in rhyolites of the Central Andes (Chivinar volcanic complex, NW Argentina): Constraints from texture, mineralogy and rock chemistry; Elsevier Science; Lithos; 184-187; 10-2013; 62-73
dc.identifier.issn
0024-4937
dc.identifier.uri
http://hdl.handle.net/11336/31239
dc.description.abstract
Topaz-bearing rhyolite lavas were erupted as domes and cryptodomes during the early history of the Late Miocene Chivinar volcano, in Central Andes. These are the only topaz rhyolite lavas recognized in Central Andes. Textural, mineralogical and geochemical data on the Chivinar rhyolites suggest that topaz crystallized from strongly residual, fluorine-rich, peraluminous silicate melts of topazite composition before the complete solidification of the lava domes. Crystallization of the rhyolitic magma began with sodic plagioclase and alkali feldspar phenocrysts in the magma chamber, followed by groundmass quartz + alkali feldspar + minor sodic plagioclase during dome emplacement, and terminated with quartz + topaz + vapour bubbles forming small scattered miaroles. Fluorine partitioning into the fluid phase occurred only in the final stage of groundmass crystallization. The magmatic origin of topaz indicates the presence of a fluorine-rich highly differentiated magma in the early history of the Chivinar volcano and suggests the possibility of rare metals mineralizations related to the cooling and solidification of a silicic magma chamber. A late fluid circulation phase, pre-dating the andesitic phase of the Chivinar volcano, affected part of the topaz rhyolite lavas. The presence of Nb, Ta and Mn minerals as primary accessories in the rhyolites and as secondary minerals in veins suggests a connection of the fluid circulation phase with the silicic magmatic system. Although at the edge of the active volcanic arc, the Chivinar topaz rhyolites are in correspondence of the transtensive Calama–Olacapato–El Toro fault system, suggesting preferred extensional conditions for the formation of magmatic topaz in convergent settings, consistently with evidence from other known cases worldwide.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Elsevier Science
dc.rights
info:eu-repo/semantics/restrictedAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
Topaz-Bearing Rhyolite
dc.subject
Fluorine
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Magmatic Volatiles
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Miarolitic Texture
dc.subject.classification
Meteorología y Ciencias Atmosféricas
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Ciencias de la Tierra y relacionadas con el Medio Ambiente
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CIENCIAS NATURALES Y EXACTAS
dc.title
Topaz magmatic crystallization in rhyolites of the Central Andes (Chivinar volcanic complex, NW Argentina): Constraints from texture, mineralogy and rock chemistry
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2017-12-11T19:31:11Z
dc.journal.volume
184-187
dc.journal.pagination
62-73
dc.journal.pais
Países Bajos
dc.journal.ciudad
Amsterdam
dc.description.fil
Fil: Gioncada, Anna. Università degli Studi di Pisa; Italia
dc.description.fil
Fil: Orlandi, Paolo. Università degli Studi di Pisa; Italia
dc.description.fil
Fil: Vezzoli, Luigina. Università dell'Insubria; Italia
dc.description.fil
Fil: Omarini, Ricardo Hector. Universidad Nacional de Salta. Facultad de Ciencias Naturales; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
dc.description.fil
Fil: Mazzuoli, Roberto. Università degli Studi di Pisa; Italia
dc.description.fil
Fil: Lopez Azarevich, Vanina. Universidad Nacional de Salta. Facultad de Ciencias Naturales; Argentina
dc.description.fil
Fil: Sureda, Ricardo Jose. Universidad Nacional de Salta. Facultad de Ciencias Naturales; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
dc.description.fil
Fil: Azarevich, Miguel Basilio. Universidad Nacional de Salta. Facultad de Ciencias Naturales; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
dc.description.fil
Fil: Acocella, Valerio. Università Roma Tre; Italia
dc.description.fil
Fil: Ruch, Joel. Università Roma Tre; Italia
dc.journal.title
Lithos
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1016/j.lithos.2013.10.023
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/http://www.sciencedirect.com/science/article/pii/S0024493713003393


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