Early Cretaceous alkaline volcanism of the Sierra Chica de Córdoba (Argentina): Mineralogy, geochemistry and petrogenesis

Distinct groups of volcanic rocks, mainly of potassic character, were recognized from the different localities of the Sierra Chica de Córdoba (SCC): (1) alkali basalt to trachyte suite, (2) transitional basalt to latibasalt suite and (3) basanites. Magma evolution would have taken place at crustal l...

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Autor principal: Lagorio, S.L.
Formato: JOUR
Materias:
Alkaline volcanic rocks
Argentina
Córdoba
Early Cretaceous
Sierra Chica
chemical composition
Cretaceous
mantle chemistry
mineralogy
volcanic rock
volcanism
Cordoba [Argentina]
Sierra Chica de Cordoba
South America
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_08959811_v26_n2_p152_Lagorio
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
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spelling todo:paper_08959811_v26_n2_p152_Lagorio2023-10-03T15:42:48Z Early Cretaceous alkaline volcanism of the Sierra Chica de Córdoba (Argentina): Mineralogy, geochemistry and petrogenesis Lagorio, S.L. Alkaline volcanic rocks Argentina Córdoba Early Cretaceous Sierra Chica chemical composition Cretaceous mantle chemistry mineralogy volcanic rock volcanism Argentina Cordoba [Argentina] Sierra Chica de Cordoba South America Distinct groups of volcanic rocks, mainly of potassic character, were recognized from the different localities of the Sierra Chica de Córdoba (SCC): (1) alkali basalt to trachyte suite, (2) transitional basalt to latibasalt suite and (3) basanites. Magma evolution would have taken place at crustal level(s) from distinct parental magmas, mainly through fractional crystallization in an open system magma chamber. Source composition supports garnet and phlogopite as residual phases in the mantle. Melting degrees (5-7%) from an enriched mantle source are in accordance with the peripheral position related to the great thermal anomaly that triggered the voluminous Paraná flood tholeiites. SCC volcanism is of high-Ti, with multi-elemental patterns similar to those from Alto Paranaíba (Brazil) and clearly distinct from the ones of low-Ti provinces, as Eastern Paraguay. Though associated with a mobile belt of the Pampean Orogeny, volcanism of SCC does not reveal compositional features that can be related to slab-derived mantle metasomatism, so that the small-scale heterogeneity of the SCC lithospheric mantle source must be related to enrichment events involving volatile-rich small-volume melts from the asthenosphere. © 2008 Elsevier Ltd. All rights reserved. Fil:Lagorio, S.L. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_08959811_v26_n2_p152_Lagorio
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Alkaline volcanic rocks
Argentina
Córdoba
Early Cretaceous
Sierra Chica
chemical composition
Cretaceous
mantle chemistry
mineralogy
volcanic rock
volcanism
Argentina
Cordoba [Argentina]
Sierra Chica de Cordoba
South America
spellingShingle Alkaline volcanic rocks
Argentina
Córdoba
Early Cretaceous
Sierra Chica
chemical composition
Cretaceous
mantle chemistry
mineralogy
volcanic rock
volcanism
Argentina
Cordoba [Argentina]
Sierra Chica de Cordoba
South America
Lagorio, S.L.
Early Cretaceous alkaline volcanism of the Sierra Chica de Córdoba (Argentina): Mineralogy, geochemistry and petrogenesis
topic_facet Alkaline volcanic rocks
Argentina
Córdoba
Early Cretaceous
Sierra Chica
chemical composition
Cretaceous
mantle chemistry
mineralogy
volcanic rock
volcanism
Argentina
Cordoba [Argentina]
Sierra Chica de Cordoba
South America
description Distinct groups of volcanic rocks, mainly of potassic character, were recognized from the different localities of the Sierra Chica de Córdoba (SCC): (1) alkali basalt to trachyte suite, (2) transitional basalt to latibasalt suite and (3) basanites. Magma evolution would have taken place at crustal level(s) from distinct parental magmas, mainly through fractional crystallization in an open system magma chamber. Source composition supports garnet and phlogopite as residual phases in the mantle. Melting degrees (5-7%) from an enriched mantle source are in accordance with the peripheral position related to the great thermal anomaly that triggered the voluminous Paraná flood tholeiites. SCC volcanism is of high-Ti, with multi-elemental patterns similar to those from Alto Paranaíba (Brazil) and clearly distinct from the ones of low-Ti provinces, as Eastern Paraguay. Though associated with a mobile belt of the Pampean Orogeny, volcanism of SCC does not reveal compositional features that can be related to slab-derived mantle metasomatism, so that the small-scale heterogeneity of the SCC lithospheric mantle source must be related to enrichment events involving volatile-rich small-volume melts from the asthenosphere. © 2008 Elsevier Ltd. All rights reserved.
format JOUR
author Lagorio, S.L.
author_facet Lagorio, S.L.
author_sort Lagorio, S.L.
title Early Cretaceous alkaline volcanism of the Sierra Chica de Córdoba (Argentina): Mineralogy, geochemistry and petrogenesis
title_short Early Cretaceous alkaline volcanism of the Sierra Chica de Córdoba (Argentina): Mineralogy, geochemistry and petrogenesis
title_full Early Cretaceous alkaline volcanism of the Sierra Chica de Córdoba (Argentina): Mineralogy, geochemistry and petrogenesis
title_fullStr Early Cretaceous alkaline volcanism of the Sierra Chica de Córdoba (Argentina): Mineralogy, geochemistry and petrogenesis
title_full_unstemmed Early Cretaceous alkaline volcanism of the Sierra Chica de Córdoba (Argentina): Mineralogy, geochemistry and petrogenesis
title_sort early cretaceous alkaline volcanism of the sierra chica de córdoba (argentina): mineralogy, geochemistry and petrogenesis
url http://hdl.handle.net/20.500.12110/paper_08959811_v26_n2_p152_Lagorio
work_keys_str_mv AT lagoriosl earlycretaceousalkalinevolcanismofthesierrachicadecordobaargentinamineralogygeochemistryandpetrogenesis
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