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...
Guardado en:
Autor principal: | |
---|---|
Formato: | JOUR |
Materias: | |
Acceso en línea: | http://hdl.handle.net/20.500.12110/paper_08959811_v26_n2_p152_Lagorio |
Aporte de: |
id |
todo:paper_08959811_v26_n2_p152_Lagorio |
---|---|
record_format |
dspace |
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 |
_version_ |
1782025408095453184 |