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...

Descripción completa

Guardado en:
Detalles Bibliográficos
Autor principal: Lagorio, Silvia Leonor
Publicado: 2008
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:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_08959811_v26_n2_p152_Lagorio
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
id paper:paper_08959811_v26_n2_p152_Lagorio
record_format dspace
spelling paper:paper_08959811_v26_n2_p152_Lagorio2023-06-08T15:48:23Z Early Cretaceous alkaline volcanism of the Sierra Chica de Córdoba (Argentina): Mineralogy, geochemistry and petrogenesis Lagorio, Silvia Leonor 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. 2008 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_08959811_v26_n2_p152_Lagorio 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, Silvia Leonor
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.
author Lagorio, Silvia Leonor
author_facet Lagorio, Silvia Leonor
author_sort Lagorio, Silvia Leonor
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
publishDate 2008
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_08959811_v26_n2_p152_Lagorio
http://hdl.handle.net/20.500.12110/paper_08959811_v26_n2_p152_Lagorio
work_keys_str_mv AT lagoriosilvialeonor earlycretaceousalkalinevolcanismofthesierrachicadecordobaargentinamineralogygeochemistryandpetrogenesis
_version_ 1768544825379913728

Ejemplares similares