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Artículo

Puna (Argentina) and northern Chile Ordovician basic magmatism: A contribution to the tectonic setting

Coira, Beatriz Lidia LuisaIcon ; Koukharsky, Magdalena Maria L.Icon ; Rivero Guevara, S.; Cisterna, Clara EugeniaIcon
Fecha de publicación: 02/2009
Editorial: Pergamon-Elsevier Science Ltd
Revista: Journal of South American Earth Sciences
ISSN: 0895-9811
Idioma: Inglés
Tipo de recurso: Artículo publicado
Clasificación temática:
Meteorología y Ciencias Atmosféricas

Resumen

Geochemical characteristics of Ordovician basic volcanic rocks help to define the evolving tectonic setting of the Argentine Puna and northern Chile. Four spatially distinct magmatic groups are defined on geological, petrographical, geochemical and isotopic bases, each associated with particular geodynamic environments. The Tremadoc western group of subalkaline low K tholeiites with arc and modified MORB like signatures represent early stages of a back-arc basin, where spreading was incipient. The Arenig western group, medium K calc-alkaline basalts to andesites have volcanic arc in transition to back-arc signatures. The Tremadoc subalkaline basalts of the eastern group have REE patterns similar to E-MORB and at the same time weak subduction characteristics suggesting a rather mature supra-subduction zone (SSZ) basin. In contrast, the Late Tremadocian-Arenig basalts of the same group have intra-plate signatures, interpreted as magmas that ascended along pull apart regions associated with a transtensional regime. The geochemical patterns were applied to correlate basic sequences of doubtful geological setting. So, basalts from Chile were related to the Tremadocian western group, where they represent a slightly more mature stage of spreading of the basin. Basic rocks from Pocitos and part of Calalaste represent pre-Ordovician records of a back-arc system similar to that of the Tremadoc western group. Clearly similar arc patterns to those of the Arenig western group allow extending the arc environment to the southern Puna. The Tremadocian basalts from the eastern group were related to metabasites from the southern Puna, as part of a back-arc environment at that time.
Palabras clave: Argentina , Basic Magmatism , Northern Chile , Ordovician , Puna
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info:eu-repo/semantics/openAccess Excepto donde se diga explícitamente, este item se publica bajo la siguiente descripción: Creative Commons Attribution-NonCommercial-ShareAlike 2.5 Unported (CC BY-NC-SA 2.5)
Identificadores
URI: http://hdl.handle.net/11336/78067
URL: https://www.sciencedirect.com/science/article/pii/S0895981108000965
DOI: https://doi.org/10.1016/j.jsames.2008.10.002
Colecciones
Articulos(CCT - NOA SUR)
Articulos de CTRO.CIENTIFICO TECNOL.CONICET - NOA SUR
Articulos(SEDE CENTRAL)
Articulos de SEDE CENTRAL
Citación
Coira, Beatriz Lidia Luisa; Koukharsky, Magdalena Maria L.; Rivero Guevara, S.; Cisterna, Clara Eugenia; Puna (Argentina) and northern Chile Ordovician basic magmatism: A contribution to the tectonic setting; Pergamon-Elsevier Science Ltd; Journal of South American Earth Sciences; 27; 1; 2-2009; 24-35
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