Late Cenozoic brittle deformation in the Southern Patagonian Andes: Record of plate coupling/decoupling during variable subduction?

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...

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Autores principales:	Barberón, V., Sue, C., Ghiglione, M., Ronda, G., Aragón, E.
Formato:	JOUR
Materias:	brittle deformation geodynamics Patagonia plate coupling/decoupling Southern Andes tectonics Cenozoic plate tectonics strike-slip fault subduction Andes
Acceso en línea:	http://hdl.handle.net/20.500.12110/paper_09544879_v30_n4_p296_Barberon
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	todo:paper_09544879_v30_n4_p296_Barberon
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spelling	todo:paper_09544879_v30_n4_p296_Barberon2023-10-03T15:51:45Z Late Cenozoic brittle deformation in the Southern Patagonian Andes: Record of plate coupling/decoupling during variable subduction? Barberón, V. Sue, C. Ghiglione, M. Ronda, G. Aragón, E. brittle deformation geodynamics Patagonia plate coupling/decoupling Southern Andes tectonics brittle deformation Cenozoic geodynamics plate tectonics strike-slip fault subduction Andes Patagonia 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 JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_09544879_v30_n4_p296_Barberon
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic	brittle deformation geodynamics Patagonia plate coupling/decoupling Southern Andes tectonics brittle deformation Cenozoic geodynamics plate tectonics strike-slip fault subduction Andes Patagonia
spellingShingle	brittle deformation geodynamics Patagonia plate coupling/decoupling Southern Andes tectonics brittle deformation Cenozoic geodynamics plate tectonics strike-slip fault subduction Andes Patagonia 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?
topic_facet	brittle deformation geodynamics Patagonia plate coupling/decoupling Southern Andes tectonics brittle deformation Cenozoic geodynamics plate tectonics strike-slip fault subduction Andes Patagonia
description	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
format	JOUR
author	Barberón, V. Sue, C. Ghiglione, M. Ronda, G. Aragón, E.
author_facet	Barberón, V. Sue, C. Ghiglione, M. Ronda, G. Aragón, E.
author_sort	Barberón, V.
title	Late Cenozoic brittle deformation in the Southern Patagonian Andes: Record of plate coupling/decoupling during variable subduction?
title_short	Late Cenozoic brittle deformation in the Southern Patagonian Andes: Record of plate coupling/decoupling during variable subduction?
title_full	Late Cenozoic brittle deformation in the Southern Patagonian Andes: Record of plate coupling/decoupling during variable subduction?
title_fullStr	Late Cenozoic brittle deformation in the Southern Patagonian Andes: Record of plate coupling/decoupling during variable subduction?
title_full_unstemmed	Late Cenozoic brittle deformation in the Southern Patagonian Andes: Record of plate coupling/decoupling during variable subduction?
title_sort	late cenozoic brittle deformation in the southern patagonian andes: record of plate coupling/decoupling during variable subduction?
url	http://hdl.handle.net/20.500.12110/paper_09544879_v30_n4_p296_Barberon
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Late Cenozoic brittle deformation in the Southern Patagonian Andes: Record of plate coupling/decoupling during variable subduction?

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