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Abstract:

Geochronological data pertaining to the structural evolution of the Sierra de San Luis provide important insights into the geodynamic history along the southwestern margin of Gondwana. In the Pringles metamorphic complex, metamorphic fabrics (S1) were affected by two folding events (D2 and D3) related to the Ordovician approach of the Cuyania terrane. Contemporary formations of high-temperature shear zones record a prominent east-side-up displacement. Resumption of compression due to the Achalian collision with the Chilenia terrane was accommodated by the reactivation of the Famatinian high-temperature shear zones in greenschist facies conditions. K-Ar Ms ages point to their activity up to the Early Carboniferous. The post-Pampean structural evolution of the Pringles metamorphic complex is supported by new Sm-Nd and 207Pb/206Pb data, which agree with previously proposed early Cambrian sedimentation of the psammopelitic precursors. A Sm-Nd mineral isochron, together with published SHRIMP U-Pb zircon ages, bracket the emplacement of mafic and ultramafic intrusions that control the granulite facies metamorphism between 506 and 478 Ma. A late Cambrian emplacement of the crustal-derived Paso del Rey pluton is suggested by a 207Pb/206Pb zircon age at 491 ± 19 Ma. The syn-D2 emplacement of these granitoids indicates that the D1 to D2 structural evolution predates the generally assumed Middle Ordovician accretion of the Precordillera/Cuyania terrane. K-Ar Hbl, Ms, and Bt ages and some Rb-Sr mica data record the cooling after the Famatinian metamorphic peak. Ms ages from large Ms booklets suggest a common cooling of the basement of the sierra at approximately 445 Ma, whereas normal-sized muscovites from gneissic rocks (K-Ar ages of ∼380 Ma) indicate slow cooling of the Pringles metamorphic complex with respect to the other basement domains. K-Ar Bt ages between 360 and 340 Ma capture cooling below approximately 300 °C of the basement. Differential cooling is interpreted to reflect the Achalian tectonic cycle as an event separate from the Famatinian process. © 2007 Elsevier Ltd. All rights reserved.

Registro:

Documento: Artículo
Título:Time constraints on the Famatinian and Achalian structural evolution of the basement of the Sierra de San Luis (Eastern Sierras Pampeanas, Argentina)
Autor:Steenken, A.; Siegesmund, S.; Wemmer, K.; López de Luchi, M.G.
Filiación:Universidade de São Paulo, Instituto de Geociências, Departamento de Mineralogia e Geotectônica, Rua do Lago, 562, CEP 05508-080, São Paulo, SP, Brazil
Geoscience Centre, the University of Göttingen, University Göttingen, Goldschmidtstr. 3, 37077 Göttingen, Germany
Instituto de Geocronología y Geología Isotópica, Pabellón INGEIS, C1428EHA, Buenos Aires, Argentina
Palabras clave:Eastern Sierras Pampeanas; Famatinian and Achalian cycles; Geochronology; Sierra de San Luis; Structural evolution; emplacement; geochronology; geodynamics; igneous intrusion; Paleozoic; tectonic evolution; uranium-lead dating; Argentina; San Luis; Sierra de San Luis; Sierras Pampeanas; South America
Año:2008
Volumen:25
Número:3
Página de inicio:336
Página de fin:358
DOI: http://dx.doi.org/10.1016/j.jsames.2007.05.002
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_v25_n3_p336_Steenken

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Citas:

---------- APA ----------
Steenken, A., Siegesmund, S., Wemmer, K. & López de Luchi, M.G. (2008) . Time constraints on the Famatinian and Achalian structural evolution of the basement of the Sierra de San Luis (Eastern Sierras Pampeanas, Argentina). Journal of South American Earth Sciences, 25(3), 336-358.
http://dx.doi.org/10.1016/j.jsames.2007.05.002
---------- CHICAGO ----------
Steenken, A., Siegesmund, S., Wemmer, K., López de Luchi, M.G. "Time constraints on the Famatinian and Achalian structural evolution of the basement of the Sierra de San Luis (Eastern Sierras Pampeanas, Argentina)" . Journal of South American Earth Sciences 25, no. 3 (2008) : 336-358.
http://dx.doi.org/10.1016/j.jsames.2007.05.002
---------- MLA ----------
Steenken, A., Siegesmund, S., Wemmer, K., López de Luchi, M.G. "Time constraints on the Famatinian and Achalian structural evolution of the basement of the Sierra de San Luis (Eastern Sierras Pampeanas, Argentina)" . Journal of South American Earth Sciences, vol. 25, no. 3, 2008, pp. 336-358.
http://dx.doi.org/10.1016/j.jsames.2007.05.002
---------- VANCOUVER ----------
Steenken, A., Siegesmund, S., Wemmer, K., López de Luchi, M.G. Time constraints on the Famatinian and Achalian structural evolution of the basement of the Sierra de San Luis (Eastern Sierras Pampeanas, Argentina). J. South Am. Earth Sci. 2008;25(3):336-358.
http://dx.doi.org/10.1016/j.jsames.2007.05.002