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Abstract:

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.

Registro:

Documento: Artículo
Título:Puna (Argentina) and northern Chile Ordovician basic magmatism: A contribution to the tectonic setting
Autor:Coira, B.; Koukharsky, M.; Guevara, S.R.; Cisterna, C.E.
Filiación:Instituto de Geología y Minería, UNJu-CONICET, C.C. 258, 4600 S.S. de Jujuy, Argentina
Departamento de Ciencias Geológicas, Facultad de Ciencias Exactas y Naturales, UBA-CONICET, C.Universitaria, Pabellon 2, Piso 1, 1428 Buenos Aires, Argentina
Centro Atómico Bariloche, 8400 Bariloche, Río Negro, Argentina
Facultad de Ciencias Naturales, UNT-CONICET, Miguel Lillo 205, 4000 San Miguel de Tucumán, Argentina
Palabras clave:Argentina; Basic magmatism; Northern Chile; Ordovician; Puna; backarc basin; island arc; magmatism; mid-ocean ridge basalt; Ordovician; petrography; subduction zone; tectonic setting; volcanic rock; Andes; Argentina; Chile; Pocito; Puna; San Juan [Argentina]; South America
Año:2009
Volumen:27
Número:1
Página de inicio:24
Página de fin:35
DOI: http://dx.doi.org/10.1016/j.jsames.2008.10.002
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_v27_n1_p24_Coira

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Citas:

---------- APA ----------
Coira, B., Koukharsky, M., Guevara, S.R. & Cisterna, C.E. (2009) . Puna (Argentina) and northern Chile Ordovician basic magmatism: A contribution to the tectonic setting. Journal of South American Earth Sciences, 27(1), 24-35.
http://dx.doi.org/10.1016/j.jsames.2008.10.002
---------- CHICAGO ----------
Coira, B., Koukharsky, M., Guevara, S.R., Cisterna, C.E. "Puna (Argentina) and northern Chile Ordovician basic magmatism: A contribution to the tectonic setting" . Journal of South American Earth Sciences 27, no. 1 (2009) : 24-35.
http://dx.doi.org/10.1016/j.jsames.2008.10.002
---------- MLA ----------
Coira, B., Koukharsky, M., Guevara, S.R., Cisterna, C.E. "Puna (Argentina) and northern Chile Ordovician basic magmatism: A contribution to the tectonic setting" . Journal of South American Earth Sciences, vol. 27, no. 1, 2009, pp. 24-35.
http://dx.doi.org/10.1016/j.jsames.2008.10.002
---------- VANCOUVER ----------
Coira, B., Koukharsky, M., Guevara, S.R., Cisterna, C.E. Puna (Argentina) and northern Chile Ordovician basic magmatism: A contribution to the tectonic setting. J. South Am. Earth Sci. 2009;27(1):24-35.
http://dx.doi.org/10.1016/j.jsames.2008.10.002