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Abstract:

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.

Registro:

Documento: Artículo
Título:Early Cretaceous alkaline volcanism of the Sierra Chica de Córdoba (Argentina): Mineralogy, geochemistry and petrogenesis
Autor:Lagorio, S.L.
Filiación:Departamento de Ciencias Geológicas, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires. Now, Buenos Aires, Argentina
Palabras clave: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
Año:2008
Volumen:26
Número:2
Página de inicio:152
Página de fin:171
DOI: http://dx.doi.org/10.1016/j.jsames.2008.05.003
Título revista:Journal of South American Earth Sciences
Título revista abreviado:J. South Am. Earth Sci.
ISSN:08959811
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_08959811_v26_n2_p152_Lagorio

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Citas:

---------- APA ----------
(2008) . Early Cretaceous alkaline volcanism of the Sierra Chica de Córdoba (Argentina): Mineralogy, geochemistry and petrogenesis. Journal of South American Earth Sciences, 26(2), 152-171.
http://dx.doi.org/10.1016/j.jsames.2008.05.003
---------- CHICAGO ----------
Lagorio, S.L. "Early Cretaceous alkaline volcanism of the Sierra Chica de Córdoba (Argentina): Mineralogy, geochemistry and petrogenesis" . Journal of South American Earth Sciences 26, no. 2 (2008) : 152-171.
http://dx.doi.org/10.1016/j.jsames.2008.05.003
---------- MLA ----------
Lagorio, S.L. "Early Cretaceous alkaline volcanism of the Sierra Chica de Córdoba (Argentina): Mineralogy, geochemistry and petrogenesis" . Journal of South American Earth Sciences, vol. 26, no. 2, 2008, pp. 152-171.
http://dx.doi.org/10.1016/j.jsames.2008.05.003
---------- VANCOUVER ----------
Lagorio, S.L. Early Cretaceous alkaline volcanism of the Sierra Chica de Córdoba (Argentina): Mineralogy, geochemistry and petrogenesis. J. South Am. Earth Sci. 2008;26(2):152-171.
http://dx.doi.org/10.1016/j.jsames.2008.05.003