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Abstract:

The Andes of southern Patagonia experienced a Miocene shift towards faster and higher angle subduction followed by the approach and collision of the Chile oceanic ridge. We present a kinematic study characterizing palaeostress fields computed from brittle tectonics to better constrain upper crustal deformation during this complex scenario. Although previous studies already suggested variable kinematics, it is striking that in a long-lasting subduction environment, the computed palaeostress tensors are mostly strike-slip (55%), while 35% are extensional, and only 10% compressive which are concentrated along a main frontal thrust. Cross-cutting relationships and synsedimentary deformation indicate that a long-lived strike-slip regime was punctuated by a lower Miocene extensional event in the foreland before the main compressional event. The results are discussed in contrasting geodynamic models of plate coupling/decoupling versus direction and rate of convergence of the subducting plate, to explain the main mechanisms that control back-arc deformation. © 2018 John Wiley & Sons Ltd

Registro:

Documento: Artículo
Título:Late Cenozoic brittle deformation in the Southern Patagonian Andes: Record of plate coupling/decoupling during variable subduction?
Autor:Barberón, V.; Sue, C.; Ghiglione, M.; Ronda, G.; Aragón, E.
Filiación:IDEAN (Universidad de Buenos Aires-CONICET), Buenos Aires, Argentina
Université de Bourgogne–Franche-Comté, CNRS-UMR6249, Besançon cedex, France
Centro de Investigaciones Geológicas (UNLP-CONICET), La Plata, Argentina
Facultad de Ciencias Naturales y Museo, Universidad Nacional de la Plata, La Plata, Argentina
Palabras clave:brittle deformation; geodynamics; Patagonia; plate coupling/decoupling; Southern Andes; tectonics; brittle deformation; Cenozoic; geodynamics; plate tectonics; strike-slip fault; subduction; Andes; Patagonia
Año:2018
Volumen:30
Número:4
Página de inicio:296
Página de fin:309
DOI: http://dx.doi.org/10.1111/ter.12339
Título revista:Terra Nova
Título revista abreviado:Terra Nova
ISSN:09544879
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09544879_v30_n4_p296_Barberon

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Citas:

---------- APA ----------
Barberón, V., Sue, C., Ghiglione, M., Ronda, G. & Aragón, E. (2018) . Late Cenozoic brittle deformation in the Southern Patagonian Andes: Record of plate coupling/decoupling during variable subduction?. Terra Nova, 30(4), 296-309.
http://dx.doi.org/10.1111/ter.12339
---------- CHICAGO ----------
Barberón, V., Sue, C., Ghiglione, M., Ronda, G., Aragón, E. "Late Cenozoic brittle deformation in the Southern Patagonian Andes: Record of plate coupling/decoupling during variable subduction?" . Terra Nova 30, no. 4 (2018) : 296-309.
http://dx.doi.org/10.1111/ter.12339
---------- MLA ----------
Barberón, V., Sue, C., Ghiglione, M., Ronda, G., Aragón, E. "Late Cenozoic brittle deformation in the Southern Patagonian Andes: Record of plate coupling/decoupling during variable subduction?" . Terra Nova, vol. 30, no. 4, 2018, pp. 296-309.
http://dx.doi.org/10.1111/ter.12339
---------- VANCOUVER ----------
Barberón, V., Sue, C., Ghiglione, M., Ronda, G., Aragón, E. Late Cenozoic brittle deformation in the Southern Patagonian Andes: Record of plate coupling/decoupling during variable subduction?. Terra Nova. 2018;30(4):296-309.
http://dx.doi.org/10.1111/ter.12339