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Abstract:

The Andes between 36°30′ and 37°S represent a Cretaceous fold and thrust belt strongly reactivated in the late Miocene. Most of the features that absorbed Neogene shortening were already uplifted in the late Cretaceous, as revealed by field mapping and confirmed by previous fission track analysis. This Andean section is formed by two sectors: a western-inner sector generated by the closure of the upper Oligocene-lower Miocene intra-arc Cura Mallín basin between the middle and late Miocene (Guañacos fold and thrust belt), and an eastern-outer sector, where late Triassic-early Jurassic extensional depocenters were exhumed in two discrete phases of contraction, in the latest early Cretaceous and late Miocene to the Present, respectively (Chos Malal fold and thrust belt). Late Miocene deformation has not homogeneously reactivated Cretaceous compressive structures, being minimal south of 37°30′S through the eastern-outer sector (southern continuation of the Chos Malal fold and thrust belt). The reason for such an inhomogeneous deformational evolution seems to be related to the development of a late Miocene shallow subduction regime between 34°30′ and 37°45′S, as it was proposed in previous studies. This shallow subduction zone is evidenced by the eastward expansion of the arc that was accompanied by the eastern displacement of the orogenic front at these latitudes. As a result, the Cretaceous fold and thrust belt were strongly reactivated north of 37°30′S producing the major topographic break along the Southern Central Andes. © 2007 Elsevier Ltd. All rights reserved.

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Documento: Artículo
Título:Andean evolution at the Guañacos and Chos Malal fold and thrust belts (36°30′-37°s)
Autor:Folguera, A.; Ramos, V.A.; Zapata, T.; Spagnuolo, M.G.
Filiación:Laboratorio de Tectónica Andina, Departamento de Ciencias Geológicas, Facultad de Ciencias Exactas y Naturales (UBA), Pabellón II, 1428 Buenos Aires, Argentina
Repsol -YPF, Esmeralda 255, Piso 10, C1035ABE Buenos Aires, Argentina
Palabras clave:Ancient shallow-slab subduction; Andean deformation; Cretaceous and Miocene deformation; Orogenic front shifting; Southern Central Andes; Andean orogeny; Cretaceous; deformation mechanism; displacement; fission track dating; fold and thrust belt; Jurassic; Miocene; Oligocene; subduction zone; Triassic; Andes; South America; Cura
Año:2007
Volumen:44
Número:3-5
Página de inicio:129
Página de fin:148
DOI: http://dx.doi.org/10.1016/j.jog.2007.02.003
Título revista:Journal of Geodynamics
Título revista abreviado:J. Geodyn.
ISSN:02643707
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_02643707_v44_n3-5_p129_Folguera

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Citas:

---------- APA ----------
Folguera, A., Ramos, V.A., Zapata, T. & Spagnuolo, M.G. (2007) . Andean evolution at the Guañacos and Chos Malal fold and thrust belts (36°30′-37°s). Journal of Geodynamics, 44(3-5), 129-148.
http://dx.doi.org/10.1016/j.jog.2007.02.003
---------- CHICAGO ----------
Folguera, A., Ramos, V.A., Zapata, T., Spagnuolo, M.G. "Andean evolution at the Guañacos and Chos Malal fold and thrust belts (36°30′-37°s)" . Journal of Geodynamics 44, no. 3-5 (2007) : 129-148.
http://dx.doi.org/10.1016/j.jog.2007.02.003
---------- MLA ----------
Folguera, A., Ramos, V.A., Zapata, T., Spagnuolo, M.G. "Andean evolution at the Guañacos and Chos Malal fold and thrust belts (36°30′-37°s)" . Journal of Geodynamics, vol. 44, no. 3-5, 2007, pp. 129-148.
http://dx.doi.org/10.1016/j.jog.2007.02.003
---------- VANCOUVER ----------
Folguera, A., Ramos, V.A., Zapata, T., Spagnuolo, M.G. Andean evolution at the Guañacos and Chos Malal fold and thrust belts (36°30′-37°s). J. Geodyn. 2007;44(3-5):129-148.
http://dx.doi.org/10.1016/j.jog.2007.02.003